Merge pull request #13659 from grpc/revert-13658-revert-13058-execctx

Revert "Revert "All instances of exec_ctx being passed around in src/core removed""

include/grpc++/support/channel_arguments.h

@@ -122,7 +122,7 @@ class ChannelArguments {
   /// Default pointer argument operations.
   struct PointerVtableMembers {
     static void* Copy(void* in) { return in; }
-    static void Destroy(grpc_exec_ctx* exec_ctx, void* in) {}
+    static void Destroy(void* in) {}
     static int Compare(void* a, void* b) {
       if (a < b) return -1;
       if (a > b) return 1;

include/grpc/impl/codegen/grpc_types.h

@@ -85,7 +85,7 @@ typedef enum {
 
 typedef struct grpc_arg_pointer_vtable {
   void* (*copy)(void* p);
-  void (*destroy)(grpc_exec_ctx* exec_ctx, void* p);
+  void (*destroy)(void* p);
   int (*cmp)(void* p, void* q);
 } grpc_arg_pointer_vtable;
 

include/grpc/impl/codegen/slice.h

@@ -43,7 +43,7 @@ typedef struct grpc_slice grpc_slice;
 
 typedef struct grpc_slice_refcount_vtable {
   void (*ref)(void*);
-  void (*unref)(grpc_exec_ctx* exec_ctx, void*);
+  void (*unref)(void*);
   int (*eq)(grpc_slice a, grpc_slice b);
   uint32_t (*hash)(grpc_slice slice);
 } grpc_slice_refcount_vtable;

include/grpc/slice_buffer.h

@@ -67,8 +67,7 @@ GPRAPI void grpc_slice_buffer_move_first_no_ref(grpc_slice_buffer* src,
                                                 size_t n,
                                                 grpc_slice_buffer* dst);
 /** move the first n bytes of src into dst (copying them) */
-GPRAPI void grpc_slice_buffer_move_first_into_buffer(grpc_exec_ctx* exec_ctx,
-                                                     grpc_slice_buffer* src,
+GPRAPI void grpc_slice_buffer_move_first_into_buffer(grpc_slice_buffer* src,
                                                      size_t n, void* dst);
 /** take the first slice in the slice buffer */
 GPRAPI grpc_slice grpc_slice_buffer_take_first(grpc_slice_buffer* src);

include/grpc/support/tls.h

@@ -32,6 +32,12 @@
      GPR_TLS_DECL(foo);
    Thread locals always have static scope.
 
+   Declaring a thread local class variable 'foo':
+     GPR_TLS_CLASS_DECL(foo);
+
+   Defining the thread local class variable:
+     GPR_TLS_CLASS_DEF(foo);
+
    Initializing a thread local (must be done at library initialization
    time):
      gpr_tls_init(&foo);

include/grpc/support/tls_gcc.h

@@ -33,6 +33,11 @@ struct gpr_gcc_thread_local {
 #define GPR_TLS_DECL(name) \
   static __thread struct gpr_gcc_thread_local name = {0}
 
+#define GPR_TLS_CLASS_DECL(name) \
+  static __thread struct gpr_gcc_thread_local name
+
+#define GPR_TLS_CLASS_DEF(name) __thread struct gpr_gcc_thread_local name = {0}
+
 #define gpr_tls_init(tls) \
   do {                    \
   } while (0)

include/grpc/support/tls_msvc.h

@@ -26,9 +26,18 @@ struct gpr_msvc_thread_local {
   intptr_t value;
 };
 
+/** Use GPR_TLS_DECL to declare tls static variables outside a class */
 #define GPR_TLS_DECL(name) \
   static __declspec(thread) struct gpr_msvc_thread_local name = {0}
 
+/** Use GPR_TLS_CLASS_DECL to declare tls static variable members of a class.
+ *  GPR_TLS_CLASS_DEF needs to be called to define this member. */
+#define GPR_TLS_CLASS_DECL(name) \
+  static __declspec(thread) struct gpr_msvc_thread_local name
+
+#define GPR_TLS_CLASS_DEF(name) \
+  __declspec(thread) struct gpr_msvc_thread_local name = {0}
+
 #define gpr_tls_init(tls) \
   do {                    \
   } while (0)

include/grpc/support/tls_pthread.h

@@ -29,8 +29,17 @@ struct gpr_pthread_thread_local {
   pthread_key_t key;
 };
 
+/** Use GPR_TLS_DECL to declare tls static variables outside a class */
 #define GPR_TLS_DECL(name) static struct gpr_pthread_thread_local name = {0}
 
+/** Use GPR_TLS_CLASS_DECL to declare tls static variable members of a class.
+ *  GPR_TLS_CLASS_DEF needs to be called to define this member. */
+#define GPR_TLS_CLASS_DECL(name) static struct gpr_pthread_thread_local name
+
+/** Use GPR_TLS_CLASS_DEF to declare tls static variable members of a class.
+ *  GPR_TLS_CLASS_DEF needs to be called to define this member. */
+#define GPR_TLS_CLASS_DEF(name) struct gpr_pthread_thread_local name = {0}
+
 #define gpr_tls_init(tls) GPR_ASSERT(0 == pthread_key_create(&(tls)->key, NULL))
 #define gpr_tls_destroy(tls) pthread_key_delete((tls)->key)
 #define gpr_tls_get(tls) ((intptr_t)pthread_getspecific((tls)->key))

src/core/ext/filters/client_channel/backup_poller.cc

@@ -69,20 +69,19 @@ static void init_globals() {
   gpr_free(env);
 }
 
-static void backup_poller_shutdown_unref(grpc_exec_ctx* exec_ctx,
-                                         backup_poller* p) {
+static void backup_poller_shutdown_unref(backup_poller* p) {
   if (gpr_unref(&p->shutdown_refs)) {
-    grpc_pollset_destroy(exec_ctx, p->pollset);
+    grpc_pollset_destroy(p->pollset);
     gpr_free(p->pollset);
     gpr_free(p);
   }
 }
 
-static void done_poller(grpc_exec_ctx* exec_ctx, void* arg, grpc_error* error) {
-  backup_poller_shutdown_unref(exec_ctx, (backup_poller*)arg);
+static void done_poller(void* arg, grpc_error* error) {
+  backup_poller_shutdown_unref((backup_poller*)arg);
 }
 
-static void g_poller_unref(grpc_exec_ctx* exec_ctx) {
+static void g_poller_unref() {
   gpr_mu_lock(&g_poller_mu);
   if (gpr_unref(&g_poller->refs)) {
     backup_poller* p = g_poller;
@@ -90,42 +89,42 @@ static void g_poller_unref(grpc_exec_ctx* exec_ctx) {
     gpr_mu_unlock(&g_poller_mu);
     gpr_mu_lock(p->pollset_mu);
     p->shutting_down = true;
-    grpc_pollset_shutdown(exec_ctx, p->pollset,
-                          GRPC_CLOSURE_INIT(&p->shutdown_closure, done_poller,
-                                            p, grpc_schedule_on_exec_ctx));
+    grpc_pollset_shutdown(
+        p->pollset, GRPC_CLOSURE_INIT(&p->shutdown_closure, done_poller, p,
+                                      grpc_schedule_on_exec_ctx));
     gpr_mu_unlock(p->pollset_mu);
-    grpc_timer_cancel(exec_ctx, &p->polling_timer);
+    grpc_timer_cancel(&p->polling_timer);
   } else {
     gpr_mu_unlock(&g_poller_mu);
   }
 }
 
-static void run_poller(grpc_exec_ctx* exec_ctx, void* arg, grpc_error* error) {
+static void run_poller(void* arg, grpc_error* error) {
   backup_poller* p = (backup_poller*)arg;
   if (error != GRPC_ERROR_NONE) {
     if (error != GRPC_ERROR_CANCELLED) {
       GRPC_LOG_IF_ERROR("run_poller", GRPC_ERROR_REF(error));
     }
-    backup_poller_shutdown_unref(exec_ctx, p);
+    backup_poller_shutdown_unref(p);
     return;
   }
   gpr_mu_lock(p->pollset_mu);
   if (p->shutting_down) {
     gpr_mu_unlock(p->pollset_mu);
-    backup_poller_shutdown_unref(exec_ctx, p);
+    backup_poller_shutdown_unref(p);
     return;
   }
-  grpc_error* err = grpc_pollset_work(exec_ctx, p->pollset, nullptr,
-                                      grpc_exec_ctx_now(exec_ctx));
+  grpc_error* err =
+      grpc_pollset_work(p->pollset, nullptr, grpc_core::ExecCtx::Get()->Now());
   gpr_mu_unlock(p->pollset_mu);
   GRPC_LOG_IF_ERROR("Run client channel backup poller", err);
-  grpc_timer_init(exec_ctx, &p->polling_timer,
-                  grpc_exec_ctx_now(exec_ctx) + g_poll_interval_ms,
+  grpc_timer_init(&p->polling_timer,
+                  grpc_core::ExecCtx::Get()->Now() + g_poll_interval_ms,
                   &p->run_poller_closure);
 }
 
 void grpc_client_channel_start_backup_polling(
-    grpc_exec_ctx* exec_ctx, grpc_pollset_set* interested_parties) {
+    grpc_pollset_set* interested_parties) {
   gpr_once_init(&g_once, init_globals);
   if (g_poll_interval_ms == 0) {
     return;
@@ -141,8 +140,8 @@ void grpc_client_channel_start_backup_polling(
     gpr_ref_init(&g_poller->shutdown_refs, 2);
     GRPC_CLOSURE_INIT(&g_poller->run_poller_closure, run_poller, g_poller,
                       grpc_schedule_on_exec_ctx);
-    grpc_timer_init(exec_ctx, &g_poller->polling_timer,
-                    grpc_exec_ctx_now(exec_ctx) + g_poll_interval_ms,
+    grpc_timer_init(&g_poller->polling_timer,
+                    grpc_core::ExecCtx::Get()->Now() + g_poll_interval_ms,
                     &g_poller->run_poller_closure);
   }
 
@@ -154,14 +153,14 @@ void grpc_client_channel_start_backup_polling(
   grpc_pollset* pollset = g_poller->pollset;
   gpr_mu_unlock(&g_poller_mu);
 
-  grpc_pollset_set_add_pollset(exec_ctx, interested_parties, pollset);
+  grpc_pollset_set_add_pollset(interested_parties, pollset);
 }
 
 void grpc_client_channel_stop_backup_polling(
-    grpc_exec_ctx* exec_ctx, grpc_pollset_set* interested_parties) {
+    grpc_pollset_set* interested_parties) {
   if (g_poll_interval_ms == 0) {
     return;
   }
-  grpc_pollset_set_del_pollset(exec_ctx, interested_parties, g_poller->pollset);
-  g_poller_unref(exec_ctx);
+  grpc_pollset_set_del_pollset(interested_parties, g_poller->pollset);
+  g_poller_unref();
 }

src/core/ext/filters/client_channel/backup_poller.h

@@ -25,10 +25,10 @@
 
 /* Start polling \a interested_parties periodically in the timer thread  */
 void grpc_client_channel_start_backup_polling(
-    grpc_exec_ctx* exec_ctx, grpc_pollset_set* interested_parties);
+    grpc_pollset_set* interested_parties);
 
 /* Stop polling \a interested_parties */
 void grpc_client_channel_stop_backup_polling(
-    grpc_exec_ctx* exec_ctx, grpc_pollset_set* interested_parties);
+    grpc_pollset_set* interested_parties);
 
 #endif /* GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_BACKUP_POLLER_H */

src/core/ext/filters/client_channel/channel_connectivity.cc

@@ -33,22 +33,22 @@ grpc_connectivity_state grpc_channel_check_connectivity_state(
   /* forward through to the underlying client channel */
   grpc_channel_element* client_channel_elem =
       grpc_channel_stack_last_element(grpc_channel_get_channel_stack(channel));
-  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+  grpc_core::ExecCtx exec_ctx;
   grpc_connectivity_state state;
   GRPC_API_TRACE(
       "grpc_channel_check_connectivity_state(channel=%p, try_to_connect=%d)", 2,
       (channel, try_to_connect));
   if (client_channel_elem->filter == &grpc_client_channel_filter) {
-    state = grpc_client_channel_check_connectivity_state(
-        &exec_ctx, client_channel_elem, try_to_connect);
-    grpc_exec_ctx_finish(&exec_ctx);
+    state = grpc_client_channel_check_connectivity_state(client_channel_elem,
+                                                         try_to_connect);
+
     return state;
   }
   gpr_log(GPR_ERROR,
           "grpc_channel_check_connectivity_state called on something that is "
           "not a client channel, but '%s'",
           client_channel_elem->filter->name);
-  grpc_exec_ctx_finish(&exec_ctx);
+
   return GRPC_CHANNEL_SHUTDOWN;
 }
 
@@ -73,12 +73,11 @@ typedef struct {
   void* tag;
 } state_watcher;
 
-static void delete_state_watcher(grpc_exec_ctx* exec_ctx, state_watcher* w) {
+static void delete_state_watcher(state_watcher* w) {
   grpc_channel_element* client_channel_elem = grpc_channel_stack_last_element(
       grpc_channel_get_channel_stack(w->channel));
   if (client_channel_elem->filter == &grpc_client_channel_filter) {
-    GRPC_CHANNEL_INTERNAL_UNREF(exec_ctx, w->channel,
-                                "watch_channel_connectivity");
+    GRPC_CHANNEL_INTERNAL_UNREF(w->channel, "watch_channel_connectivity");
   } else {
     abort();
   }
@@ -86,8 +85,7 @@ static void delete_state_watcher(grpc_exec_ctx* exec_ctx, state_watcher* w) {
   gpr_free(w);
 }
 
-static void finished_completion(grpc_exec_ctx* exec_ctx, void* pw,
-                                grpc_cq_completion* ignored) {
+static void finished_completion(void* pw, grpc_cq_completion* ignored) {
   bool should_delete = false;
   state_watcher* w = (state_watcher*)pw;
   gpr_mu_lock(&w->mu);
@@ -102,19 +100,19 @@ static void finished_completion(grpc_exec_ctx* exec_ctx, void* pw,
   gpr_mu_unlock(&w->mu);
 
   if (should_delete) {
-    delete_state_watcher(exec_ctx, w);
+    delete_state_watcher(w);
   }
 }
 
-static void partly_done(grpc_exec_ctx* exec_ctx, state_watcher* w,
-                        bool due_to_completion, grpc_error* error) {
+static void partly_done(state_watcher* w, bool due_to_completion,
+                        grpc_error* error) {
   if (due_to_completion) {
-    grpc_timer_cancel(exec_ctx, &w->alarm);
+    grpc_timer_cancel(&w->alarm);
   } else {
     grpc_channel_element* client_channel_elem = grpc_channel_stack_last_element(
         grpc_channel_get_channel_stack(w->channel));
     grpc_client_channel_watch_connectivity_state(
-        exec_ctx, client_channel_elem,
+        client_channel_elem,
         grpc_polling_entity_create_from_pollset(grpc_cq_pollset(w->cq)),
         nullptr, &w->on_complete, nullptr);
   }
@@ -149,7 +147,7 @@ static void partly_done(grpc_exec_ctx* exec_ctx, state_watcher* w,
         w->error = error;
       }
       w->phase = CALLING_BACK_AND_FINISHED;
-      grpc_cq_end_op(exec_ctx, w->cq, w->tag, w->error, finished_completion, w,
+      grpc_cq_end_op(w->cq, w->tag, w->error, finished_completion, w,
                      &w->completion_storage);
       break;
     case CALLING_BACK_AND_FINISHED:
@@ -161,14 +159,12 @@ static void partly_done(grpc_exec_ctx* exec_ctx, state_watcher* w,
   GRPC_ERROR_UNREF(error);
 }
 
-static void watch_complete(grpc_exec_ctx* exec_ctx, void* pw,
-                           grpc_error* error) {
-  partly_done(exec_ctx, (state_watcher*)pw, true, GRPC_ERROR_REF(error));
+static void watch_complete(void* pw, grpc_error* error) {
+  partly_done((state_watcher*)pw, true, GRPC_ERROR_REF(error));
 }
 
-static void timeout_complete(grpc_exec_ctx* exec_ctx, void* pw,
-                             grpc_error* error) {
-  partly_done(exec_ctx, (state_watcher*)pw, false, GRPC_ERROR_REF(error));
+static void timeout_complete(void* pw, grpc_error* error) {
+  partly_done((state_watcher*)pw, false, GRPC_ERROR_REF(error));
 }
 
 int grpc_channel_num_external_connectivity_watchers(grpc_channel* channel) {
@@ -183,12 +179,10 @@ typedef struct watcher_timer_init_arg {
   gpr_timespec deadline;
 } watcher_timer_init_arg;
 
-static void watcher_timer_init(grpc_exec_ctx* exec_ctx, void* arg,
-                               grpc_error* error_ignored) {
+static void watcher_timer_init(void* arg, grpc_error* error_ignored) {
   watcher_timer_init_arg* wa = (watcher_timer_init_arg*)arg;
 
-  grpc_timer_init(exec_ctx, &wa->w->alarm,
-                  grpc_timespec_to_millis_round_up(wa->deadline),
+  grpc_timer_init(&wa->w->alarm, grpc_timespec_to_millis_round_up(wa->deadline),
                   &wa->w->on_timeout);
   gpr_free(wa);
 }
@@ -204,7 +198,7 @@ void grpc_channel_watch_connectivity_state(
     gpr_timespec deadline, grpc_completion_queue* cq, void* tag) {
   grpc_channel_element* client_channel_elem =
       grpc_channel_stack_last_element(grpc_channel_get_channel_stack(channel));
-  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+  grpc_core::ExecCtx exec_ctx;
   state_watcher* w = (state_watcher*)gpr_malloc(sizeof(*w));
 
   GRPC_API_TRACE(
@@ -241,12 +235,10 @@ void grpc_channel_watch_connectivity_state(
   if (client_channel_elem->filter == &grpc_client_channel_filter) {
     GRPC_CHANNEL_INTERNAL_REF(channel, "watch_channel_connectivity");
     grpc_client_channel_watch_connectivity_state(
-        &exec_ctx, client_channel_elem,
+        client_channel_elem,
         grpc_polling_entity_create_from_pollset(grpc_cq_pollset(cq)), &w->state,
         &w->on_complete, &w->watcher_timer_init);
   } else {
     abort();
   }
-
-  grpc_exec_ctx_finish(&exec_ctx);
 }

src/core/ext/filters/client_channel/client_channel.h

@@ -38,15 +38,15 @@ extern grpc_core::TraceFlag grpc_client_channel_trace;
 extern const grpc_channel_filter grpc_client_channel_filter;
 
 grpc_connectivity_state grpc_client_channel_check_connectivity_state(
-    grpc_exec_ctx* exec_ctx, grpc_channel_element* elem, int try_to_connect);
+    grpc_channel_element* elem, int try_to_connect);
 
 int grpc_client_channel_num_external_connectivity_watchers(
     grpc_channel_element* elem);
 
 void grpc_client_channel_watch_connectivity_state(
-    grpc_exec_ctx* exec_ctx, grpc_channel_element* elem,
-    grpc_polling_entity pollent, grpc_connectivity_state* state,
-    grpc_closure* on_complete, grpc_closure* watcher_timer_init);
+    grpc_channel_element* elem, grpc_polling_entity pollent,
+    grpc_connectivity_state* state, grpc_closure* on_complete,
+    grpc_closure* watcher_timer_init);
 
 /* Debug helper: pull the subchannel call from a call stack element */
 grpc_subchannel_call* grpc_client_channel_get_subchannel_call(

src/core/ext/filters/client_channel/client_channel_factory.cc

@@ -23,23 +23,19 @@ void grpc_client_channel_factory_ref(grpc_client_channel_factory* factory) {
   factory->vtable->ref(factory);
 }
 
-void grpc_client_channel_factory_unref(grpc_exec_ctx* exec_ctx,
-                                       grpc_client_channel_factory* factory) {
-  factory->vtable->unref(exec_ctx, factory);
+void grpc_client_channel_factory_unref(grpc_client_channel_factory* factory) {
+  factory->vtable->unref(factory);
 }
 
 grpc_subchannel* grpc_client_channel_factory_create_subchannel(
-    grpc_exec_ctx* exec_ctx, grpc_client_channel_factory* factory,
-    const grpc_subchannel_args* args) {
-  return factory->vtable->create_subchannel(exec_ctx, factory, args);
+    grpc_client_channel_factory* factory, const grpc_subchannel_args* args) {
+  return factory->vtable->create_subchannel(factory, args);
 }
 
 grpc_channel* grpc_client_channel_factory_create_channel(
-    grpc_exec_ctx* exec_ctx, grpc_client_channel_factory* factory,
-    const char* target, grpc_client_channel_type type,
-    const grpc_channel_args* args) {
-  return factory->vtable->create_client_channel(exec_ctx, factory, target, type,
-                                                args);
+    grpc_client_channel_factory* factory, const char* target,
+    grpc_client_channel_type type, const grpc_channel_args* args) {
+  return factory->vtable->create_client_channel(factory, target, type, args);
 }
 
 static void* factory_arg_copy(void* factory) {
@@ -47,9 +43,8 @@ static void* factory_arg_copy(void* factory) {
   return factory;
 }
 
-static void factory_arg_destroy(grpc_exec_ctx* exec_ctx, void* factory) {
-  grpc_client_channel_factory_unref(exec_ctx,
-                                    (grpc_client_channel_factory*)factory);
+static void factory_arg_destroy(void* factory) {
+  grpc_client_channel_factory_unref((grpc_client_channel_factory*)factory);
 }
 
 static int factory_arg_cmp(void* factory1, void* factory2) {

src/core/ext/filters/client_channel/client_channel_factory.h

@@ -45,31 +45,26 @@ struct grpc_client_channel_factory {
 
 struct grpc_client_channel_factory_vtable {
   void (*ref)(grpc_client_channel_factory* factory);
-  void (*unref)(grpc_exec_ctx* exec_ctx, grpc_client_channel_factory* factory);
-  grpc_subchannel* (*create_subchannel)(grpc_exec_ctx* exec_ctx,
-                                        grpc_client_channel_factory* factory,
+  void (*unref)(grpc_client_channel_factory* factory);
+  grpc_subchannel* (*create_subchannel)(grpc_client_channel_factory* factory,
                                         const grpc_subchannel_args* args);
-  grpc_channel* (*create_client_channel)(grpc_exec_ctx* exec_ctx,
-                                         grpc_client_channel_factory* factory,
+  grpc_channel* (*create_client_channel)(grpc_client_channel_factory* factory,
                                          const char* target,
                                          grpc_client_channel_type type,
                                          const grpc_channel_args* args);
 };
 
 void grpc_client_channel_factory_ref(grpc_client_channel_factory* factory);
-void grpc_client_channel_factory_unref(grpc_exec_ctx* exec_ctx,
-                                       grpc_client_channel_factory* factory);
+void grpc_client_channel_factory_unref(grpc_client_channel_factory* factory);
 
 /** Create a new grpc_subchannel */
 grpc_subchannel* grpc_client_channel_factory_create_subchannel(
-    grpc_exec_ctx* exec_ctx, grpc_client_channel_factory* factory,
-    const grpc_subchannel_args* args);
+    grpc_client_channel_factory* factory, const grpc_subchannel_args* args);
 
 /** Create a new grpc_channel */
 grpc_channel* grpc_client_channel_factory_create_channel(
-    grpc_exec_ctx* exec_ctx, grpc_client_channel_factory* factory,
-    const char* target, grpc_client_channel_type type,
-    const grpc_channel_args* args);
+    grpc_client_channel_factory* factory, const char* target,
+    grpc_client_channel_type type, const grpc_channel_args* args);
 
 grpc_arg grpc_client_channel_factory_create_channel_arg(
     grpc_client_channel_factory* factory);

src/core/ext/filters/client_channel/client_channel_plugin.cc

@@ -34,14 +34,12 @@
 #include "src/core/ext/filters/client_channel/subchannel_index.h"
 #include "src/core/lib/surface/channel_init.h"
 
-static bool append_filter(grpc_exec_ctx* exec_ctx,
-                          grpc_channel_stack_builder* builder, void* arg) {
+static bool append_filter(grpc_channel_stack_builder* builder, void* arg) {
   return grpc_channel_stack_builder_append_filter(
       builder, (const grpc_channel_filter*)arg, nullptr, nullptr);
 }
 
-static bool set_default_host_if_unset(grpc_exec_ctx* exec_ctx,
-                                      grpc_channel_stack_builder* builder,
+static bool set_default_host_if_unset(grpc_channel_stack_builder* builder,
                                       void* unused) {
   const grpc_channel_args* args =
       grpc_channel_stack_builder_get_channel_arguments(builder);
@@ -52,15 +50,14 @@ static bool set_default_host_if_unset(grpc_exec_ctx* exec_ctx,
     }
   }
   char* default_authority = grpc_get_default_authority(
-      exec_ctx, grpc_channel_stack_builder_get_target(builder));
+      grpc_channel_stack_builder_get_target(builder));
   if (default_authority != nullptr) {
     grpc_arg arg = grpc_channel_arg_string_create(
         (char*)GRPC_ARG_DEFAULT_AUTHORITY, default_authority);
     grpc_channel_args* new_args = grpc_channel_args_copy_and_add(args, &arg, 1);
-    grpc_channel_stack_builder_set_channel_arguments(exec_ctx, builder,
-                                                     new_args);
+    grpc_channel_stack_builder_set_channel_arguments(builder, new_args);
     gpr_free(default_authority);
-    grpc_channel_args_destroy(exec_ctx, new_args);
+    grpc_channel_args_destroy(new_args);
   }
   return true;
 }

src/core/ext/filters/client_channel/connector.cc

@@ -23,18 +23,17 @@ grpc_connector* grpc_connector_ref(grpc_connector* connector) {
   return connector;
 }
 
-void grpc_connector_unref(grpc_exec_ctx* exec_ctx, grpc_connector* connector) {
-  connector->vtable->unref(exec_ctx, connector);
+void grpc_connector_unref(grpc_connector* connector) {
+  connector->vtable->unref(connector);
 }
 
-void grpc_connector_connect(grpc_exec_ctx* exec_ctx, grpc_connector* connector,
+void grpc_connector_connect(grpc_connector* connector,
                             const grpc_connect_in_args* in_args,
                             grpc_connect_out_args* out_args,
                             grpc_closure* notify) {
-  connector->vtable->connect(exec_ctx, connector, in_args, out_args, notify);
+  connector->vtable->connect(connector, in_args, out_args, notify);
 }
 
-void grpc_connector_shutdown(grpc_exec_ctx* exec_ctx, grpc_connector* connector,
-                             grpc_error* why) {
-  connector->vtable->shutdown(exec_ctx, connector, why);
+void grpc_connector_shutdown(grpc_connector* connector, grpc_error* why) {
+  connector->vtable->shutdown(connector, why);
 }

src/core/ext/filters/client_channel/connector.h

@@ -49,25 +49,23 @@ typedef struct {
 
 struct grpc_connector_vtable {
   void (*ref)(grpc_connector* connector);
-  void (*unref)(grpc_exec_ctx* exec_ctx, grpc_connector* connector);
+  void (*unref)(grpc_connector* connector);
   /** Implementation of grpc_connector_shutdown */
-  void (*shutdown)(grpc_exec_ctx* exec_ctx, grpc_connector* connector,
-                   grpc_error* why);
+  void (*shutdown)(grpc_connector* connector, grpc_error* why);
   /** Implementation of grpc_connector_connect */
-  void (*connect)(grpc_exec_ctx* exec_ctx, grpc_connector* connector,
+  void (*connect)(grpc_connector* connector,
                   const grpc_connect_in_args* in_args,
                   grpc_connect_out_args* out_args, grpc_closure* notify);
 };
 
 grpc_connector* grpc_connector_ref(grpc_connector* connector);
-void grpc_connector_unref(grpc_exec_ctx* exec_ctx, grpc_connector* connector);
+void grpc_connector_unref(grpc_connector* connector);
 /** Connect using the connector: max one outstanding call at a time */
-void grpc_connector_connect(grpc_exec_ctx* exec_ctx, grpc_connector* connector,
+void grpc_connector_connect(grpc_connector* connector,
                             const grpc_connect_in_args* in_args,
                             grpc_connect_out_args* out_args,
                             grpc_closure* notify);
 /** Cancel any pending connection */
-void grpc_connector_shutdown(grpc_exec_ctx* exec_ctx, grpc_connector* connector,
-                             grpc_error* why);
+void grpc_connector_shutdown(grpc_connector* connector, grpc_error* why);
 
 #endif /* GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_CONNECTOR_H */

src/core/ext/filters/client_channel/http_connect_handshaker.cc

@@ -61,41 +61,38 @@ typedef struct http_connect_handshaker {
 } http_connect_handshaker;
 
 // Unref and clean up handshaker.
-static void http_connect_handshaker_unref(grpc_exec_ctx* exec_ctx,
-                                          http_connect_handshaker* handshaker) {
+static void http_connect_handshaker_unref(http_connect_handshaker* handshaker) {
   if (gpr_unref(&handshaker->refcount)) {
     gpr_mu_destroy(&handshaker->mu);
     if (handshaker->endpoint_to_destroy != nullptr) {
-      grpc_endpoint_destroy(exec_ctx, handshaker->endpoint_to_destroy);
+      grpc_endpoint_destroy(handshaker->endpoint_to_destroy);
     }
     if (handshaker->read_buffer_to_destroy != nullptr) {
-      grpc_slice_buffer_destroy_internal(exec_ctx,
-                                         handshaker->read_buffer_to_destroy);
+      grpc_slice_buffer_destroy_internal(handshaker->read_buffer_to_destroy);
       gpr_free(handshaker->read_buffer_to_destroy);
     }
-    grpc_slice_buffer_destroy_internal(exec_ctx, &handshaker->write_buffer);
+    grpc_slice_buffer_destroy_internal(&handshaker->write_buffer);
     grpc_http_parser_destroy(&handshaker->http_parser);
     grpc_http_response_destroy(&handshaker->http_response);
     gpr_free(handshaker);
   }
 }
 
-// Set args fields to NULL, saving the endpoint and read buffer for
+// Set args fields to nullptr, saving the endpoint and read buffer for
 // later destruction.
 static void cleanup_args_for_failure_locked(
-    grpc_exec_ctx* exec_ctx, http_connect_handshaker* handshaker) {
+    http_connect_handshaker* handshaker) {
   handshaker->endpoint_to_destroy = handshaker->args->endpoint;
   handshaker->args->endpoint = nullptr;
   handshaker->read_buffer_to_destroy = handshaker->args->read_buffer;
   handshaker->args->read_buffer = nullptr;
-  grpc_channel_args_destroy(exec_ctx, handshaker->args->args);
+  grpc_channel_args_destroy(handshaker->args->args);
   handshaker->args->args = nullptr;
 }
 
 // If the handshake failed or we're shutting down, clean up and invoke the
 // callback with the error.
-static void handshake_failed_locked(grpc_exec_ctx* exec_ctx,
-                                    http_connect_handshaker* handshaker,
+static void handshake_failed_locked(http_connect_handshaker* handshaker,
                                     grpc_error* error) {
   if (error == GRPC_ERROR_NONE) {
     // If we were shut down after an endpoint operation succeeded but
@@ -108,34 +105,32 @@ static void handshake_failed_locked(grpc_exec_ctx* exec_ctx,
     // before destroying them, even if we know that there are no
     // pending read/write callbacks.  This should be fixed, at which
     // point this can be removed.
-    grpc_endpoint_shutdown(exec_ctx, handshaker->args->endpoint,
-                           GRPC_ERROR_REF(error));
+    grpc_endpoint_shutdown(handshaker->args->endpoint, GRPC_ERROR_REF(error));
     // Not shutting down, so the handshake failed.  Clean up before
     // invoking the callback.
-    cleanup_args_for_failure_locked(exec_ctx, handshaker);
+    cleanup_args_for_failure_locked(handshaker);
     // Set shutdown to true so that subsequent calls to
     // http_connect_handshaker_shutdown() do nothing.
     handshaker->shutdown = true;
   }
   // Invoke callback.
-  GRPC_CLOSURE_SCHED(exec_ctx, handshaker->on_handshake_done, error);
+  GRPC_CLOSURE_SCHED(handshaker->on_handshake_done, error);
 }
 
 // Callback invoked when finished writing HTTP CONNECT request.
-static void on_write_done(grpc_exec_ctx* exec_ctx, void* arg,
-                          grpc_error* error) {
+static void on_write_done(void* arg, grpc_error* error) {
   http_connect_handshaker* handshaker = (http_connect_handshaker*)arg;
   gpr_mu_lock(&handshaker->mu);
   if (error != GRPC_ERROR_NONE || handshaker->shutdown) {
     // If the write failed or we're shutting down, clean up and invoke the
     // callback with the error.
-    handshake_failed_locked(exec_ctx, handshaker, GRPC_ERROR_REF(error));
+    handshake_failed_locked(handshaker, GRPC_ERROR_REF(error));
     gpr_mu_unlock(&handshaker->mu);
-    http_connect_handshaker_unref(exec_ctx, handshaker);
+    http_connect_handshaker_unref(handshaker);
   } else {
     // Otherwise, read the response.
     // The read callback inherits our ref to the handshaker.
-    grpc_endpoint_read(exec_ctx, handshaker->args->endpoint,
+    grpc_endpoint_read(handshaker->args->endpoint,
                        handshaker->args->read_buffer,
                        &handshaker->response_read_closure);
     gpr_mu_unlock(&handshaker->mu);
@@ -143,14 +138,13 @@ static void on_write_done(grpc_exec_ctx* exec_ctx, void* arg,
 }
 
 // Callback invoked for reading HTTP CONNECT response.
-static void on_read_done(grpc_exec_ctx* exec_ctx, void* arg,
-                         grpc_error* error) {
+static void on_read_done(void* arg, grpc_error* error) {
   http_connect_handshaker* handshaker = (http_connect_handshaker*)arg;
   gpr_mu_lock(&handshaker->mu);
   if (error != GRPC_ERROR_NONE || handshaker->shutdown) {
     // If the read failed or we're shutting down, clean up and invoke the
     // callback with the error.
-    handshake_failed_locked(exec_ctx, handshaker, GRPC_ERROR_REF(error));
+    handshake_failed_locked(handshaker, GRPC_ERROR_REF(error));
     goto done;
   }
   // Add buffer to parser.
@@ -161,7 +155,7 @@ static void on_read_done(grpc_exec_ctx* exec_ctx, void* arg,
                                      handshaker->args->read_buffer->slices[i],
                                      &body_start_offset);
       if (error != GRPC_ERROR_NONE) {
-        handshake_failed_locked(exec_ctx, handshaker, error);
+        handshake_failed_locked(handshaker, error);
         goto done;
       }
       if (handshaker->http_parser.state == GRPC_HTTP_BODY) {
@@ -180,7 +174,7 @@ static void on_read_done(grpc_exec_ctx* exec_ctx, void* arg,
                                &handshaker->args->read_buffer->slices[i + 1],
                                handshaker->args->read_buffer->count - i - 1);
         grpc_slice_buffer_swap(handshaker->args->read_buffer, &tmp_buffer);
-        grpc_slice_buffer_destroy_internal(exec_ctx, &tmp_buffer);
+        grpc_slice_buffer_destroy_internal(&tmp_buffer);
         break;
       }
     }
@@ -197,9 +191,8 @@ static void on_read_done(grpc_exec_ctx* exec_ctx, void* arg,
   // complete (e.g., handling chunked transfer encoding or looking
   // at the Content-Length: header).
   if (handshaker->http_parser.state != GRPC_HTTP_BODY) {
-    grpc_slice_buffer_reset_and_unref_internal(exec_ctx,
-                                               handshaker->args->read_buffer);
-    grpc_endpoint_read(exec_ctx, handshaker->args->endpoint,
+    grpc_slice_buffer_reset_and_unref_internal(handshaker->args->read_buffer);
+    grpc_endpoint_read(handshaker->args->endpoint,
                        handshaker->args->read_buffer,
                        &handshaker->response_read_closure);
     gpr_mu_unlock(&handshaker->mu);
@@ -213,48 +206,44 @@ static void on_read_done(grpc_exec_ctx* exec_ctx, void* arg,
                  handshaker->http_response.status);
     error = GRPC_ERROR_CREATE_FROM_COPIED_STRING(msg);
     gpr_free(msg);
-    handshake_failed_locked(exec_ctx, handshaker, error);
+    handshake_failed_locked(handshaker, error);
     goto done;
   }
   // Success.  Invoke handshake-done callback.
-  GRPC_CLOSURE_SCHED(exec_ctx, handshaker->on_handshake_done, error);
+  GRPC_CLOSURE_SCHED(handshaker->on_handshake_done, error);
 done:
   // Set shutdown to true so that subsequent calls to
   // http_connect_handshaker_shutdown() do nothing.
   handshaker->shutdown = true;
   gpr_mu_unlock(&handshaker->mu);
-  http_connect_handshaker_unref(exec_ctx, handshaker);
+  http_connect_handshaker_unref(handshaker);
 }
 
 //
 // Public handshaker methods
 //
 
-static void http_connect_handshaker_destroy(grpc_exec_ctx* exec_ctx,
-                                            grpc_handshaker* handshaker_in) {
+static void http_connect_handshaker_destroy(grpc_handshaker* handshaker_in) {
   http_connect_handshaker* handshaker = (http_connect_handshaker*)handshaker_in;
-  http_connect_handshaker_unref(exec_ctx, handshaker);
+  http_connect_handshaker_unref(handshaker);
 }
 
-static void http_connect_handshaker_shutdown(grpc_exec_ctx* exec_ctx,
-                                             grpc_handshaker* handshaker_in,
+static void http_connect_handshaker_shutdown(grpc_handshaker* handshaker_in,
                                              grpc_error* why) {
   http_connect_handshaker* handshaker = (http_connect_handshaker*)handshaker_in;
   gpr_mu_lock(&handshaker->mu);
   if (!handshaker->shutdown) {
     handshaker->shutdown = true;
-    grpc_endpoint_shutdown(exec_ctx, handshaker->args->endpoint,
-                           GRPC_ERROR_REF(why));
-    cleanup_args_for_failure_locked(exec_ctx, handshaker);
+    grpc_endpoint_shutdown(handshaker->args->endpoint, GRPC_ERROR_REF(why));
+    cleanup_args_for_failure_locked(handshaker);
   }
   gpr_mu_unlock(&handshaker->mu);
   GRPC_ERROR_UNREF(why);
 }
 
 static void http_connect_handshaker_do_handshake(
-    grpc_exec_ctx* exec_ctx, grpc_handshaker* handshaker_in,
-    grpc_tcp_server_acceptor* acceptor, grpc_closure* on_handshake_done,
-    grpc_handshaker_args* args) {
+    grpc_handshaker* handshaker_in, grpc_tcp_server_acceptor* acceptor,
+    grpc_closure* on_handshake_done, grpc_handshaker_args* args) {
   http_connect_handshaker* handshaker = (http_connect_handshaker*)handshaker_in;
   // Check for HTTP CONNECT channel arg.
   // If not found, invoke on_handshake_done without doing anything.
@@ -266,7 +255,7 @@ static void http_connect_handshaker_do_handshake(
     gpr_mu_lock(&handshaker->mu);
     handshaker->shutdown = true;
     gpr_mu_unlock(&handshaker->mu);
-    GRPC_CLOSURE_SCHED(exec_ctx, on_handshake_done, GRPC_ERROR_NONE);
+    GRPC_CLOSURE_SCHED(on_handshake_done, GRPC_ERROR_NONE);
     return;
   }
   GPR_ASSERT(arg->type == GRPC_ARG_STRING);
@@ -324,7 +313,7 @@ static void http_connect_handshaker_do_handshake(
   gpr_free(header_strings);
   // Take a new ref to be held by the write callback.
   gpr_ref(&handshaker->refcount);
-  grpc_endpoint_write(exec_ctx, args->endpoint, &handshaker->write_buffer,
+  grpc_endpoint_write(args->endpoint, &handshaker->write_buffer,
                       &handshaker->request_done_closure);
   gpr_mu_unlock(&handshaker->mu);
 }
@@ -355,14 +344,13 @@ static grpc_handshaker* grpc_http_connect_handshaker_create() {
 //
 
 static void handshaker_factory_add_handshakers(
-    grpc_exec_ctx* exec_ctx, grpc_handshaker_factory* factory,
-    const grpc_channel_args* args, grpc_handshake_manager* handshake_mgr) {
+    grpc_handshaker_factory* factory, const grpc_channel_args* args,
+    grpc_handshake_manager* handshake_mgr) {
   grpc_handshake_manager_add(handshake_mgr,
                              grpc_http_connect_handshaker_create());
 }
 
-static void handshaker_factory_destroy(grpc_exec_ctx* exec_ctx,
-                                       grpc_handshaker_factory* factory) {}
+static void handshaker_factory_destroy(grpc_handshaker_factory* factory) {}
 
 static const grpc_handshaker_factory_vtable handshaker_factory_vtable = {
     handshaker_factory_add_handshakers, handshaker_factory_destroy};

src/core/ext/filters/client_channel/http_proxy.cc

@@ -36,19 +36,18 @@
 
 /**
  * Parses the 'http_proxy' env var and returns the proxy hostname to resolve or
- * NULL on error. Also sets 'user_cred' to user credentials if present in the
+ * nullptr on error. Also sets 'user_cred' to user credentials if present in the
  * 'http_proxy' env var, otherwise leaves it unchanged. It is caller's
  * responsibility to gpr_free user_cred.
  */
-static char* get_http_proxy_server(grpc_exec_ctx* exec_ctx, char** user_cred) {
+static char* get_http_proxy_server(char** user_cred) {
   GPR_ASSERT(user_cred != nullptr);
   char* proxy_name = nullptr;
   char* uri_str = gpr_getenv("http_proxy");
   char** authority_strs = nullptr;
   size_t authority_nstrs;
   if (uri_str == nullptr) return nullptr;
-  grpc_uri* uri =
-      grpc_uri_parse(exec_ctx, uri_str, false /* suppress_errors */);
+  grpc_uri* uri = grpc_uri_parse(uri_str, false /* suppress_errors */);
   if (uri == nullptr || uri->authority == nullptr) {
     gpr_log(GPR_ERROR, "cannot parse value of 'http_proxy' env var");
     goto done;
@@ -82,18 +81,16 @@ done:
   return proxy_name;
 }
 
-static bool proxy_mapper_map_name(grpc_exec_ctx* exec_ctx,
-                                  grpc_proxy_mapper* mapper,
+static bool proxy_mapper_map_name(grpc_proxy_mapper* mapper,
                                   const char* server_uri,
                                   const grpc_channel_args* args,
                                   char** name_to_resolve,
                                   grpc_channel_args** new_args) {
   char* user_cred = nullptr;
-  *name_to_resolve = get_http_proxy_server(exec_ctx, &user_cred);
+  *name_to_resolve = get_http_proxy_server(&user_cred);
   if (*name_to_resolve == nullptr) return false;
   char* no_proxy_str = nullptr;
-  grpc_uri* uri =
-      grpc_uri_parse(exec_ctx, server_uri, false /* suppress_errors */);
+  grpc_uri* uri = grpc_uri_parse(server_uri, false /* suppress_errors */);
   if (uri == nullptr || uri->path[0] == '\0') {
     gpr_log(GPR_ERROR,
             "'http_proxy' environment variable set, but cannot "
@@ -174,8 +171,7 @@ no_use_proxy:
   return false;
 }
 
-static bool proxy_mapper_map_address(grpc_exec_ctx* exec_ctx,
-                                     grpc_proxy_mapper* mapper,
+static bool proxy_mapper_map_address(grpc_proxy_mapper* mapper,
                                      const grpc_resolved_address* address,
                                      const grpc_channel_args* args,
                                      grpc_resolved_address** new_address,

src/core/ext/filters/client_channel/lb_policy.cc

@@ -63,15 +63,13 @@ void grpc_lb_policy_ref(grpc_lb_policy* policy REF_FUNC_EXTRA_ARGS) {
   ref_mutate(policy, 1 << WEAK_REF_BITS, 0 REF_MUTATE_PASS_ARGS("STRONG_REF"));
 }
 
-static void shutdown_locked(grpc_exec_ctx* exec_ctx, void* arg,
-                            grpc_error* error) {
+static void shutdown_locked(void* arg, grpc_error* error) {
   grpc_lb_policy* policy = (grpc_lb_policy*)arg;
-  policy->vtable->shutdown_locked(exec_ctx, policy);
-  GRPC_LB_POLICY_WEAK_UNREF(exec_ctx, policy, "strong-unref");
+  policy->vtable->shutdown_locked(policy);
+  GRPC_LB_POLICY_WEAK_UNREF(policy, "strong-unref");
 }
 
-void grpc_lb_policy_unref(grpc_exec_ctx* exec_ctx,
-                          grpc_lb_policy* policy REF_FUNC_EXTRA_ARGS) {
+void grpc_lb_policy_unref(grpc_lb_policy* policy REF_FUNC_EXTRA_ARGS) {
   gpr_atm old_val =
       ref_mutate(policy, (gpr_atm)1 - (gpr_atm)(1 << WEAK_REF_BITS),
                  1 REF_MUTATE_PASS_ARGS("STRONG_UNREF"));
@@ -79,13 +77,11 @@ void grpc_lb_policy_unref(grpc_exec_ctx* exec_ctx,
   gpr_atm check = 1 << WEAK_REF_BITS;
   if ((old_val & mask) == check) {
     GRPC_CLOSURE_SCHED(
-        exec_ctx,
         GRPC_CLOSURE_CREATE(shutdown_locked, policy,
                             grpc_combiner_scheduler(policy->combiner)),
         GRPC_ERROR_NONE);
   } else {
-    grpc_lb_policy_weak_unref(exec_ctx,
-                              policy REF_FUNC_PASS_ARGS("strong-unref"));
+    grpc_lb_policy_weak_unref(policy REF_FUNC_PASS_ARGS("strong-unref"));
   }
 }
 
@@ -93,89 +89,76 @@ void grpc_lb_policy_weak_ref(grpc_lb_policy* policy REF_FUNC_EXTRA_ARGS) {
   ref_mutate(policy, 1, 0 REF_MUTATE_PASS_ARGS("WEAK_REF"));
 }
 
-void grpc_lb_policy_weak_unref(grpc_exec_ctx* exec_ctx,
-                               grpc_lb_policy* policy REF_FUNC_EXTRA_ARGS) {
+void grpc_lb_policy_weak_unref(grpc_lb_policy* policy REF_FUNC_EXTRA_ARGS) {
   gpr_atm old_val =
       ref_mutate(policy, -(gpr_atm)1, 1 REF_MUTATE_PASS_ARGS("WEAK_UNREF"));
   if (old_val == 1) {
-    grpc_pollset_set_destroy(exec_ctx, policy->interested_parties);
+    grpc_pollset_set_destroy(policy->interested_parties);
     grpc_combiner* combiner = policy->combiner;
-    policy->vtable->destroy(exec_ctx, policy);
-    GRPC_COMBINER_UNREF(exec_ctx, combiner, "lb_policy");
+    policy->vtable->destroy(policy);
+    GRPC_COMBINER_UNREF(combiner, "lb_policy");
   }
 }
 
-int grpc_lb_policy_pick_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
+int grpc_lb_policy_pick_locked(grpc_lb_policy* policy,
                                const grpc_lb_policy_pick_args* pick_args,
                                grpc_connected_subchannel** target,
                                grpc_call_context_element* context,
                                void** user_data, grpc_closure* on_complete) {
-  return policy->vtable->pick_locked(exec_ctx, policy, pick_args, target,
-                                     context, user_data, on_complete);
+  return policy->vtable->pick_locked(policy, pick_args, target, context,
+                                     user_data, on_complete);
 }
 
-void grpc_lb_policy_cancel_pick_locked(grpc_exec_ctx* exec_ctx,
-                                       grpc_lb_policy* policy,
+void grpc_lb_policy_cancel_pick_locked(grpc_lb_policy* policy,
                                        grpc_connected_subchannel** target,
                                        grpc_error* error) {
-  policy->vtable->cancel_pick_locked(exec_ctx, policy, target, error);
+  policy->vtable->cancel_pick_locked(policy, target, error);
 }
 
-void grpc_lb_policy_cancel_picks_locked(grpc_exec_ctx* exec_ctx,
-                                        grpc_lb_policy* policy,
+void grpc_lb_policy_cancel_picks_locked(grpc_lb_policy* policy,
                                         uint32_t initial_metadata_flags_mask,
                                         uint32_t initial_metadata_flags_eq,
                                         grpc_error* error) {
-  policy->vtable->cancel_picks_locked(exec_ctx, policy,
-                                      initial_metadata_flags_mask,
+  policy->vtable->cancel_picks_locked(policy, initial_metadata_flags_mask,
                                       initial_metadata_flags_eq, error);
 }
 
-void grpc_lb_policy_exit_idle_locked(grpc_exec_ctx* exec_ctx,
-                                     grpc_lb_policy* policy) {
-  policy->vtable->exit_idle_locked(exec_ctx, policy);
+void grpc_lb_policy_exit_idle_locked(grpc_lb_policy* policy) {
+  policy->vtable->exit_idle_locked(policy);
 }
 
-void grpc_lb_policy_ping_one_locked(grpc_exec_ctx* exec_ctx,
-                                    grpc_lb_policy* policy,
+void grpc_lb_policy_ping_one_locked(grpc_lb_policy* policy,
                                     grpc_closure* on_initiate,
                                     grpc_closure* on_ack) {
-  policy->vtable->ping_one_locked(exec_ctx, policy, on_initiate, on_ack);
+  policy->vtable->ping_one_locked(policy, on_initiate, on_ack);
 }
 
 void grpc_lb_policy_notify_on_state_change_locked(
-    grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
-    grpc_connectivity_state* state, grpc_closure* closure) {
-  policy->vtable->notify_on_state_change_locked(exec_ctx, policy, state,
-                                                closure);
+    grpc_lb_policy* policy, grpc_connectivity_state* state,
+    grpc_closure* closure) {
+  policy->vtable->notify_on_state_change_locked(policy, state, closure);
 }
 
 grpc_connectivity_state grpc_lb_policy_check_connectivity_locked(
-    grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
-    grpc_error** connectivity_error) {
-  return policy->vtable->check_connectivity_locked(exec_ctx, policy,
-                                                   connectivity_error);
+    grpc_lb_policy* policy, grpc_error** connectivity_error) {
+  return policy->vtable->check_connectivity_locked(policy, connectivity_error);
 }
 
-void grpc_lb_policy_update_locked(grpc_exec_ctx* exec_ctx,
-                                  grpc_lb_policy* policy,
+void grpc_lb_policy_update_locked(grpc_lb_policy* policy,
                                   const grpc_lb_policy_args* lb_policy_args) {
-  policy->vtable->update_locked(exec_ctx, policy, lb_policy_args);
+  policy->vtable->update_locked(policy, lb_policy_args);
 }
 
 void grpc_lb_policy_set_reresolve_closure_locked(
-    grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
-    grpc_closure* request_reresolution) {
-  policy->vtable->set_reresolve_closure_locked(exec_ctx, policy,
-                                               request_reresolution);
+    grpc_lb_policy* policy, grpc_closure* request_reresolution) {
+  policy->vtable->set_reresolve_closure_locked(policy, request_reresolution);
 }
 
-void grpc_lb_policy_try_reresolve(grpc_exec_ctx* exec_ctx,
-                                  grpc_lb_policy* policy,
+void grpc_lb_policy_try_reresolve(grpc_lb_policy* policy,
                                   grpc_core::TraceFlag* grpc_lb_trace,
                                   grpc_error* error) {
   if (policy->request_reresolution != nullptr) {
-    GRPC_CLOSURE_SCHED(exec_ctx, policy->request_reresolution, error);
+    GRPC_CLOSURE_SCHED(policy->request_reresolution, error);
     policy->request_reresolution = nullptr;
     if (grpc_lb_trace->enabled()) {
       gpr_log(GPR_DEBUG,

src/core/ext/filters/client_channel/lb_policy.h

@@ -55,53 +55,50 @@ typedef struct grpc_lb_policy_pick_args {
 } grpc_lb_policy_pick_args;
 
 struct grpc_lb_policy_vtable {
-  void (*destroy)(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy);
-  void (*shutdown_locked)(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy);
+  void (*destroy)(grpc_lb_policy* policy);
+  void (*shutdown_locked)(grpc_lb_policy* policy);
 
   /** \see grpc_lb_policy_pick */
-  int (*pick_locked)(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
+  int (*pick_locked)(grpc_lb_policy* policy,
                      const grpc_lb_policy_pick_args* pick_args,
                      grpc_connected_subchannel** target,
                      grpc_call_context_element* context, void** user_data,
                      grpc_closure* on_complete);
 
   /** \see grpc_lb_policy_cancel_pick */
-  void (*cancel_pick_locked)(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
+  void (*cancel_pick_locked)(grpc_lb_policy* policy,
                              grpc_connected_subchannel** target,
                              grpc_error* error);
 
   /** \see grpc_lb_policy_cancel_picks */
-  void (*cancel_picks_locked)(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
+  void (*cancel_picks_locked)(grpc_lb_policy* policy,
                               uint32_t initial_metadata_flags_mask,
                               uint32_t initial_metadata_flags_eq,
                               grpc_error* error);
 
   /** \see grpc_lb_policy_ping_one */
-  void (*ping_one_locked)(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
-                          grpc_closure* on_initiate, grpc_closure* on_ack);
+  void (*ping_one_locked)(grpc_lb_policy* policy, grpc_closure* on_initiate,
+                          grpc_closure* on_ack);
 
   /** Try to enter a READY connectivity state */
-  void (*exit_idle_locked)(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy);
+  void (*exit_idle_locked)(grpc_lb_policy* policy);
 
   /** check the current connectivity of the lb_policy */
   grpc_connectivity_state (*check_connectivity_locked)(
-      grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
-      grpc_error** connectivity_error);
+      grpc_lb_policy* policy, grpc_error** connectivity_error);
 
   /** call notify when the connectivity state of a channel changes from *state.
       Updates *state with the new state of the policy. Calling with a NULL \a
       state cancels the subscription.  */
-  void (*notify_on_state_change_locked)(grpc_exec_ctx* exec_ctx,
-                                        grpc_lb_policy* policy,
+  void (*notify_on_state_change_locked)(grpc_lb_policy* policy,
                                         grpc_connectivity_state* state,
                                         grpc_closure* closure);
 
-  void (*update_locked)(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
+  void (*update_locked)(grpc_lb_policy* policy,
                         const grpc_lb_policy_args* args);
 
   /** \see grpc_lb_policy_set_reresolve_closure */
-  void (*set_reresolve_closure_locked)(grpc_exec_ctx* exec_ctx,
-                                       grpc_lb_policy* policy,
+  void (*set_reresolve_closure_locked)(grpc_lb_policy* policy,
                                        grpc_closure* request_reresolution);
 };
 
@@ -110,33 +107,33 @@ struct grpc_lb_policy_vtable {
 /* Strong references: the policy will shutdown when they reach zero */
 #define GRPC_LB_POLICY_REF(p, r) \
   grpc_lb_policy_ref((p), __FILE__, __LINE__, (r))
-#define GRPC_LB_POLICY_UNREF(exec_ctx, p, r) \
-  grpc_lb_policy_unref((exec_ctx), (p), __FILE__, __LINE__, (r))
+#define GRPC_LB_POLICY_UNREF(p, r) \
+  grpc_lb_policy_unref((p), __FILE__, __LINE__, (r))
 
 /* Weak references: they don't prevent the shutdown of the LB policy. When no
  * strong references are left but there are still weak ones, shutdown is called.
  * Once the weak reference also reaches zero, the LB policy is destroyed. */
 #define GRPC_LB_POLICY_WEAK_REF(p, r) \
   grpc_lb_policy_weak_ref((p), __FILE__, __LINE__, (r))
-#define GRPC_LB_POLICY_WEAK_UNREF(exec_ctx, p, r) \
-  grpc_lb_policy_weak_unref((exec_ctx), (p), __FILE__, __LINE__, (r))
+#define GRPC_LB_POLICY_WEAK_UNREF(p, r) \
+  grpc_lb_policy_weak_unref((p), __FILE__, __LINE__, (r))
 void grpc_lb_policy_ref(grpc_lb_policy* policy, const char* file, int line,
                         const char* reason);
-void grpc_lb_policy_unref(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
-                          const char* file, int line, const char* reason);
+void grpc_lb_policy_unref(grpc_lb_policy* policy, const char* file, int line,
+                          const char* reason);
 void grpc_lb_policy_weak_ref(grpc_lb_policy* policy, const char* file, int line,
                              const char* reason);
-void grpc_lb_policy_weak_unref(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
-                               const char* file, int line, const char* reason);
+void grpc_lb_policy_weak_unref(grpc_lb_policy* policy, const char* file,
+                               int line, const char* reason);
 #else
 #define GRPC_LB_POLICY_REF(p, r) grpc_lb_policy_ref((p))
-#define GRPC_LB_POLICY_UNREF(cl, p, r) grpc_lb_policy_unref((cl), (p))
+#define GRPC_LB_POLICY_UNREF(p, r) grpc_lb_policy_unref((p))
 #define GRPC_LB_POLICY_WEAK_REF(p, r) grpc_lb_policy_weak_ref((p))
-#define GRPC_LB_POLICY_WEAK_UNREF(cl, p, r) grpc_lb_policy_weak_unref((cl), (p))
+#define GRPC_LB_POLICY_WEAK_UNREF(p, r) grpc_lb_policy_weak_unref((p))
 void grpc_lb_policy_ref(grpc_lb_policy* policy);
-void grpc_lb_policy_unref(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy);
+void grpc_lb_policy_unref(grpc_lb_policy* policy);
 void grpc_lb_policy_weak_ref(grpc_lb_policy* policy);
-void grpc_lb_policy_weak_unref(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy);
+void grpc_lb_policy_weak_unref(grpc_lb_policy* policy);
 #endif
 
 /** called by concrete implementations to initialize the base struct */
@@ -161,7 +158,7 @@ void grpc_lb_policy_init(grpc_lb_policy* policy,
 
     Any IO should be done under the \a interested_parties \a grpc_pollset_set
     in the \a grpc_lb_policy struct. */
-int grpc_lb_policy_pick_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
+int grpc_lb_policy_pick_locked(grpc_lb_policy* policy,
                                const grpc_lb_policy_pick_args* pick_args,
                                grpc_connected_subchannel** target,
                                grpc_call_context_element* context,
@@ -169,56 +166,48 @@ int grpc_lb_policy_pick_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
 
 /** Perform a connected subchannel ping (see \a grpc_connected_subchannel_ping)
     against one of the connected subchannels managed by \a policy. */
-void grpc_lb_policy_ping_one_locked(grpc_exec_ctx* exec_ctx,
-                                    grpc_lb_policy* policy,
+void grpc_lb_policy_ping_one_locked(grpc_lb_policy* policy,
                                     grpc_closure* on_initiate,
                                     grpc_closure* on_ack);
 
 /** Cancel picks for \a target.
     The \a on_complete callback of the pending picks will be invoked with \a
     *target set to NULL. */
-void grpc_lb_policy_cancel_pick_locked(grpc_exec_ctx* exec_ctx,
-                                       grpc_lb_policy* policy,
+void grpc_lb_policy_cancel_pick_locked(grpc_lb_policy* policy,
                                        grpc_connected_subchannel** target,
                                        grpc_error* error);
 
 /** Cancel all pending picks for which their \a initial_metadata_flags (as given
     in the call to \a grpc_lb_policy_pick) matches \a initial_metadata_flags_eq
     when AND'd with \a initial_metadata_flags_mask */
-void grpc_lb_policy_cancel_picks_locked(grpc_exec_ctx* exec_ctx,
-                                        grpc_lb_policy* policy,
+void grpc_lb_policy_cancel_picks_locked(grpc_lb_policy* policy,
                                         uint32_t initial_metadata_flags_mask,
                                         uint32_t initial_metadata_flags_eq,
                                         grpc_error* error);
 
 /** Try to enter a READY connectivity state */
-void grpc_lb_policy_exit_idle_locked(grpc_exec_ctx* exec_ctx,
-                                     grpc_lb_policy* policy);
+void grpc_lb_policy_exit_idle_locked(grpc_lb_policy* policy);
 
 /* Call notify when the connectivity state of a channel changes from \a *state.
  * Updates \a *state with the new state of the policy */
 void grpc_lb_policy_notify_on_state_change_locked(
-    grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
-    grpc_connectivity_state* state, grpc_closure* closure);
+    grpc_lb_policy* policy, grpc_connectivity_state* state,
+    grpc_closure* closure);
 
 grpc_connectivity_state grpc_lb_policy_check_connectivity_locked(
-    grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
-    grpc_error** connectivity_error);
+    grpc_lb_policy* policy, grpc_error** connectivity_error);
 
 /** Update \a policy with \a lb_policy_args. */
-void grpc_lb_policy_update_locked(grpc_exec_ctx* exec_ctx,
-                                  grpc_lb_policy* policy,
+void grpc_lb_policy_update_locked(grpc_lb_policy* policy,
                                   const grpc_lb_policy_args* lb_policy_args);
 
 /** Set the re-resolution closure to \a request_reresolution. */
 void grpc_lb_policy_set_reresolve_closure_locked(
-    grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
-    grpc_closure* request_reresolution);
+    grpc_lb_policy* policy, grpc_closure* request_reresolution);
 
 /** Try to request a re-resolution. It's NOT a public API; it's only for use by
     the LB policy implementations. */
-void grpc_lb_policy_try_reresolve(grpc_exec_ctx* exec_ctx,
-                                  grpc_lb_policy* policy,
+void grpc_lb_policy_try_reresolve(grpc_lb_policy* policy,
                                   grpc_core::TraceFlag* grpc_lb_trace,
                                   grpc_error* error);
 

src/core/ext/filters/client_channel/lb_policy/grpclb/client_load_reporting_filter.cc

@@ -25,14 +25,12 @@
 #include "src/core/lib/iomgr/error.h"
 #include "src/core/lib/profiling/timers.h"
 
-static grpc_error* init_channel_elem(grpc_exec_ctx* exec_ctx,
-                                     grpc_channel_element* elem,
+static grpc_error* init_channel_elem(grpc_channel_element* elem,
                                      grpc_channel_element_args* args) {
   return GRPC_ERROR_NONE;
 }
 
-static void destroy_channel_elem(grpc_exec_ctx* exec_ctx,
-                                 grpc_channel_element* elem) {}
+static void destroy_channel_elem(grpc_channel_element* elem) {}
 
 typedef struct {
   // Stats object to update.
@@ -47,28 +45,24 @@ typedef struct {
   bool recv_initial_metadata_succeeded;
 } call_data;
 
-static void on_complete_for_send(grpc_exec_ctx* exec_ctx, void* arg,
-                                 grpc_error* error) {
+static void on_complete_for_send(void* arg, grpc_error* error) {
   call_data* calld = (call_data*)arg;
   if (error == GRPC_ERROR_NONE) {
     calld->send_initial_metadata_succeeded = true;
   }
-  GRPC_CLOSURE_RUN(exec_ctx, calld->original_on_complete_for_send,
-                   GRPC_ERROR_REF(error));
+  GRPC_CLOSURE_RUN(calld->original_on_complete_for_send, GRPC_ERROR_REF(error));
 }
 
-static void recv_initial_metadata_ready(grpc_exec_ctx* exec_ctx, void* arg,
-                                        grpc_error* error) {
+static void recv_initial_metadata_ready(void* arg, grpc_error* error) {
   call_data* calld = (call_data*)arg;
   if (error == GRPC_ERROR_NONE) {
     calld->recv_initial_metadata_succeeded = true;
   }
-  GRPC_CLOSURE_RUN(exec_ctx, calld->original_recv_initial_metadata_ready,
+  GRPC_CLOSURE_RUN(calld->original_recv_initial_metadata_ready,
                    GRPC_ERROR_REF(error));
 }
 
-static grpc_error* init_call_elem(grpc_exec_ctx* exec_ctx,
-                                  grpc_call_element* elem,
+static grpc_error* init_call_elem(grpc_call_element* elem,
                                   const grpc_call_element_args* args) {
   call_data* calld = (call_data*)elem->call_data;
   // Get stats object from context and take a ref.
@@ -81,7 +75,7 @@ static grpc_error* init_call_elem(grpc_exec_ctx* exec_ctx,
   return GRPC_ERROR_NONE;
 }
 
-static void destroy_call_elem(grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
+static void destroy_call_elem(grpc_call_element* elem,
                               const grpc_call_final_info* final_info,
                               grpc_closure* ignored) {
   call_data* calld = (call_data*)elem->call_data;
@@ -96,8 +90,7 @@ static void destroy_call_elem(grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
 }
 
 static void start_transport_stream_op_batch(
-    grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
-    grpc_transport_stream_op_batch* batch) {
+    grpc_call_element* elem, grpc_transport_stream_op_batch* batch) {
   call_data* calld = (call_data*)elem->call_data;
   GPR_TIMER_BEGIN("clr_start_transport_stream_op_batch", 0);
   // Intercept send_initial_metadata.
@@ -118,7 +111,7 @@ static void start_transport_stream_op_batch(
         &calld->recv_initial_metadata_ready;
   }
   // Chain to next filter.
-  grpc_call_next_op(exec_ctx, elem, batch);
+  grpc_call_next_op(elem, batch);
   GPR_TIMER_END("clr_start_transport_stream_op_batch", 0);
 }
 

src/core/ext/filters/client_channel/lb_policy/grpclb/grpclb_channel.cc

@@ -26,17 +26,17 @@
 #include "src/core/lib/support/string.h"
 
 grpc_channel* grpc_lb_policy_grpclb_create_lb_channel(
-    grpc_exec_ctx* exec_ctx, const char* lb_service_target_addresses,
+    const char* lb_service_target_addresses,
     grpc_client_channel_factory* client_channel_factory,
     grpc_channel_args* args) {
   grpc_channel* lb_channel = grpc_client_channel_factory_create_channel(
-      exec_ctx, client_channel_factory, lb_service_target_addresses,
+      client_channel_factory, lb_service_target_addresses,
       GRPC_CLIENT_CHANNEL_TYPE_LOAD_BALANCING, args);
   return lb_channel;
 }
 
 grpc_channel_args* grpc_lb_policy_grpclb_build_lb_channel_args(
-    grpc_exec_ctx* exec_ctx, grpc_slice_hash_table* targets_info,
+    grpc_slice_hash_table* targets_info,
     grpc_fake_resolver_response_generator* response_generator,
     const grpc_channel_args* args) {
   const grpc_arg to_add[] = {

src/core/ext/filters/client_channel/lb_policy/grpclb/grpclb_channel.h

@@ -31,12 +31,12 @@
  * \a client_channel_factory will be used for the creation of the LB channel,
  * alongside the channel args passed in \a args. */
 grpc_channel* grpc_lb_policy_grpclb_create_lb_channel(
-    grpc_exec_ctx* exec_ctx, const char* lb_service_target_addresses,
+    const char* lb_service_target_addresses,
     grpc_client_channel_factory* client_channel_factory,
     grpc_channel_args* args);
 
 grpc_channel_args* grpc_lb_policy_grpclb_build_lb_channel_args(
-    grpc_exec_ctx* exec_ctx, grpc_slice_hash_table* targets_info,
+    grpc_slice_hash_table* targets_info,
     grpc_fake_resolver_response_generator* response_generator,
     const grpc_channel_args* args);
 

src/core/ext/filters/client_channel/lb_policy/grpclb/grpclb_channel_secure.cc

@@ -29,7 +29,7 @@
 #include "src/core/lib/support/string.h"
 
 grpc_channel* grpc_lb_policy_grpclb_create_lb_channel(
-    grpc_exec_ctx* exec_ctx, const char* lb_service_target_addresses,
+    const char* lb_service_target_addresses,
     grpc_client_channel_factory* client_channel_factory,
     grpc_channel_args* args) {
   grpc_channel_args* new_args = args;
@@ -50,19 +50,19 @@ grpc_channel* grpc_lb_policy_grpclb_create_lb_channel(
     new_args = grpc_channel_args_copy_and_add_and_remove(
         args, keys_to_remove, GPR_ARRAY_SIZE(keys_to_remove), args_to_add,
         GPR_ARRAY_SIZE(args_to_add));
-    grpc_channel_credentials_unref(exec_ctx, creds_sans_call_creds);
+    grpc_channel_credentials_unref(creds_sans_call_creds);
   }
   grpc_channel* lb_channel = grpc_client_channel_factory_create_channel(
-      exec_ctx, client_channel_factory, lb_service_target_addresses,
+      client_channel_factory, lb_service_target_addresses,
       GRPC_CLIENT_CHANNEL_TYPE_LOAD_BALANCING, new_args);
   if (channel_credentials != nullptr) {
-    grpc_channel_args_destroy(exec_ctx, new_args);
+    grpc_channel_args_destroy(new_args);
   }
   return lb_channel;
 }
 
 grpc_channel_args* grpc_lb_policy_grpclb_build_lb_channel_args(
-    grpc_exec_ctx* exec_ctx, grpc_slice_hash_table* targets_info,
+    grpc_slice_hash_table* targets_info,
     grpc_fake_resolver_response_generator* response_generator,
     const grpc_channel_args* args) {
   const grpc_arg to_add[] = {

src/core/ext/filters/client_channel/lb_policy/pick_first/pick_first.cc

@@ -57,12 +57,12 @@ typedef struct {
   grpc_connectivity_state_tracker state_tracker;
 } pick_first_lb_policy;
 
-static void pf_destroy(grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol) {
+static void pf_destroy(grpc_lb_policy* pol) {
   pick_first_lb_policy* p = (pick_first_lb_policy*)pol;
   GPR_ASSERT(p->subchannel_list == nullptr);
   GPR_ASSERT(p->latest_pending_subchannel_list == nullptr);
   GPR_ASSERT(p->pending_picks == nullptr);
-  grpc_connectivity_state_destroy(exec_ctx, &p->state_tracker);
+  grpc_connectivity_state_destroy(&p->state_tracker);
   gpr_free(p);
   grpc_subchannel_index_unref();
   if (grpc_lb_pick_first_trace.enabled()) {
@@ -70,7 +70,7 @@ static void pf_destroy(grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol) {
   }
 }
 
-static void pf_shutdown_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol) {
+static void pf_shutdown_locked(grpc_lb_policy* pol) {
   pick_first_lb_policy* p = (pick_first_lb_policy*)pol;
   grpc_error* error = GRPC_ERROR_CREATE_FROM_STATIC_STRING("Channel shutdown");
   if (grpc_lb_pick_first_trace.enabled()) {
@@ -81,28 +81,27 @@ static void pf_shutdown_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol) {
   while ((pp = p->pending_picks) != nullptr) {
     p->pending_picks = pp->next;
     *pp->target = nullptr;
-    GRPC_CLOSURE_SCHED(exec_ctx, pp->on_complete, GRPC_ERROR_REF(error));
+    GRPC_CLOSURE_SCHED(pp->on_complete, GRPC_ERROR_REF(error));
     gpr_free(pp);
   }
-  grpc_connectivity_state_set(exec_ctx, &p->state_tracker,
-                              GRPC_CHANNEL_SHUTDOWN, GRPC_ERROR_REF(error),
-                              "shutdown");
+  grpc_connectivity_state_set(&p->state_tracker, GRPC_CHANNEL_SHUTDOWN,
+                              GRPC_ERROR_REF(error), "shutdown");
   if (p->subchannel_list != nullptr) {
-    grpc_lb_subchannel_list_shutdown_and_unref(exec_ctx, p->subchannel_list,
+    grpc_lb_subchannel_list_shutdown_and_unref(p->subchannel_list,
                                                "pf_shutdown");
     p->subchannel_list = nullptr;
   }
   if (p->latest_pending_subchannel_list != nullptr) {
     grpc_lb_subchannel_list_shutdown_and_unref(
-        exec_ctx, p->latest_pending_subchannel_list, "pf_shutdown");
+        p->latest_pending_subchannel_list, "pf_shutdown");
     p->latest_pending_subchannel_list = nullptr;
   }
-  grpc_lb_policy_try_reresolve(exec_ctx, &p->base, &grpc_lb_pick_first_trace,
+  grpc_lb_policy_try_reresolve(&p->base, &grpc_lb_pick_first_trace,
                                GRPC_ERROR_CANCELLED);
   GRPC_ERROR_UNREF(error);
 }
 
-static void pf_cancel_pick_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol,
+static void pf_cancel_pick_locked(grpc_lb_policy* pol,
                                   grpc_connected_subchannel** target,
                                   grpc_error* error) {
   pick_first_lb_policy* p = (pick_first_lb_policy*)pol;
@@ -112,7 +111,7 @@ static void pf_cancel_pick_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol,
     pending_pick* next = pp->next;
     if (pp->target == target) {
       *target = nullptr;
-      GRPC_CLOSURE_SCHED(exec_ctx, pp->on_complete,
+      GRPC_CLOSURE_SCHED(pp->on_complete,
                          GRPC_ERROR_CREATE_REFERENCING_FROM_STATIC_STRING(
                              "Pick Cancelled", &error, 1));
       gpr_free(pp);
@@ -125,7 +124,7 @@ static void pf_cancel_pick_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol,
   GRPC_ERROR_UNREF(error);
 }
 
-static void pf_cancel_picks_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol,
+static void pf_cancel_picks_locked(grpc_lb_policy* pol,
                                    uint32_t initial_metadata_flags_mask,
                                    uint32_t initial_metadata_flags_eq,
                                    grpc_error* error) {
@@ -136,7 +135,7 @@ static void pf_cancel_picks_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol,
     pending_pick* next = pp->next;
     if ((pp->initial_metadata_flags & initial_metadata_flags_mask) ==
         initial_metadata_flags_eq) {
-      GRPC_CLOSURE_SCHED(exec_ctx, pp->on_complete,
+      GRPC_CLOSURE_SCHED(pp->on_complete,
                          GRPC_ERROR_CREATE_REFERENCING_FROM_STATIC_STRING(
                              "Pick Cancelled", &error, 1));
       gpr_free(pp);
@@ -149,8 +148,7 @@ static void pf_cancel_picks_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol,
   GRPC_ERROR_UNREF(error);
 }
 
-static void start_picking_locked(grpc_exec_ctx* exec_ctx,
-                                 pick_first_lb_policy* p) {
+static void start_picking_locked(pick_first_lb_policy* p) {
   p->started_picking = true;
   if (p->subchannel_list != nullptr &&
       p->subchannel_list->num_subchannels > 0) {
@@ -160,21 +158,21 @@ static void start_picking_locked(grpc_exec_ctx* exec_ctx,
         grpc_lb_subchannel_list_ref_for_connectivity_watch(
             p->subchannel_list, "connectivity_watch+start_picking");
         grpc_lb_subchannel_data_start_connectivity_watch(
-            exec_ctx, &p->subchannel_list->subchannels[i]);
+            &p->subchannel_list->subchannels[i]);
         break;
       }
     }
   }
 }
 
-static void pf_exit_idle_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol) {
+static void pf_exit_idle_locked(grpc_lb_policy* pol) {
   pick_first_lb_policy* p = (pick_first_lb_policy*)pol;
   if (!p->started_picking) {
-    start_picking_locked(exec_ctx, p);
+    start_picking_locked(p);
   }
 }
 
-static int pf_pick_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol,
+static int pf_pick_locked(grpc_lb_policy* pol,
                           const grpc_lb_policy_pick_args* pick_args,
                           grpc_connected_subchannel** target,
                           grpc_call_context_element* context, void** user_data,
@@ -188,7 +186,7 @@ static int pf_pick_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol,
   }
   // No subchannel selected yet, so handle asynchronously.
   if (!p->started_picking) {
-    start_picking_locked(exec_ctx, p);
+    start_picking_locked(p);
   }
   pending_pick* pp = (pending_pick*)gpr_malloc(sizeof(*pp));
   pp->next = p->pending_picks;
@@ -199,51 +197,47 @@ static int pf_pick_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol,
   return 0;
 }
 
-static void destroy_unselected_subchannels_locked(grpc_exec_ctx* exec_ctx,
-                                                  pick_first_lb_policy* p) {
+static void destroy_unselected_subchannels_locked(pick_first_lb_policy* p) {
   for (size_t i = 0; i < p->subchannel_list->num_subchannels; ++i) {
     grpc_lb_subchannel_data* sd = &p->subchannel_list->subchannels[i];
     if (p->selected != sd) {
-      grpc_lb_subchannel_data_unref_subchannel(exec_ctx, sd,
+      grpc_lb_subchannel_data_unref_subchannel(sd,
                                                "selected_different_subchannel");
     }
   }
 }
 
 static grpc_connectivity_state pf_check_connectivity_locked(
-    grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol, grpc_error** error) {
+    grpc_lb_policy* pol, grpc_error** error) {
   pick_first_lb_policy* p = (pick_first_lb_policy*)pol;
   return grpc_connectivity_state_get(&p->state_tracker, error);
 }
 
-static void pf_notify_on_state_change_locked(grpc_exec_ctx* exec_ctx,
-                                             grpc_lb_policy* pol,
+static void pf_notify_on_state_change_locked(grpc_lb_policy* pol,
                                              grpc_connectivity_state* current,
                                              grpc_closure* notify) {
   pick_first_lb_policy* p = (pick_first_lb_policy*)pol;
-  grpc_connectivity_state_notify_on_state_change(exec_ctx, &p->state_tracker,
-                                                 current, notify);
+  grpc_connectivity_state_notify_on_state_change(&p->state_tracker, current,
+                                                 notify);
 }
 
-static void pf_ping_one_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol,
-                               grpc_closure* on_initiate,
+static void pf_ping_one_locked(grpc_lb_policy* pol, grpc_closure* on_initiate,
                                grpc_closure* on_ack) {
   pick_first_lb_policy* p = (pick_first_lb_policy*)pol;
   if (p->selected) {
-    grpc_connected_subchannel_ping(exec_ctx, p->selected->connected_subchannel,
+    grpc_connected_subchannel_ping(p->selected->connected_subchannel,
                                    on_initiate, on_ack);
   } else {
-    GRPC_CLOSURE_SCHED(exec_ctx, on_initiate,
+    GRPC_CLOSURE_SCHED(on_initiate,
                        GRPC_ERROR_CREATE_FROM_STATIC_STRING("Not connected"));
-    GRPC_CLOSURE_SCHED(exec_ctx, on_ack,
+    GRPC_CLOSURE_SCHED(on_ack,
                        GRPC_ERROR_CREATE_FROM_STATIC_STRING("Not connected"));
   }
 }
 
-static void pf_connectivity_changed_locked(grpc_exec_ctx* exec_ctx, void* arg,
-                                           grpc_error* error);
+static void pf_connectivity_changed_locked(void* arg, grpc_error* error);
 
-static void pf_update_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
+static void pf_update_locked(grpc_lb_policy* policy,
                              const grpc_lb_policy_args* args) {
   pick_first_lb_policy* p = (pick_first_lb_policy*)policy;
   const grpc_arg* arg =
@@ -252,7 +246,7 @@ static void pf_update_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
     if (p->subchannel_list == nullptr) {
       // If we don't have a current subchannel list, go into TRANSIENT FAILURE.
       grpc_connectivity_state_set(
-          exec_ctx, &p->state_tracker, GRPC_CHANNEL_TRANSIENT_FAILURE,
+          &p->state_tracker, GRPC_CHANNEL_TRANSIENT_FAILURE,
           GRPC_ERROR_CREATE_FROM_STATIC_STRING("Missing update in args"),
           "pf_update_missing");
     } else {
@@ -271,17 +265,17 @@ static void pf_update_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
             (void*)p, (unsigned long)addresses->num_addresses);
   }
   grpc_lb_subchannel_list* subchannel_list = grpc_lb_subchannel_list_create(
-      exec_ctx, &p->base, &grpc_lb_pick_first_trace, addresses, args,
+      &p->base, &grpc_lb_pick_first_trace, addresses, args,
       pf_connectivity_changed_locked);
   if (subchannel_list->num_subchannels == 0) {
     // Empty update or no valid subchannels. Unsubscribe from all current
     // subchannels and put the channel in TRANSIENT_FAILURE.
     grpc_connectivity_state_set(
-        exec_ctx, &p->state_tracker, GRPC_CHANNEL_TRANSIENT_FAILURE,
+        &p->state_tracker, GRPC_CHANNEL_TRANSIENT_FAILURE,
         GRPC_ERROR_CREATE_FROM_STATIC_STRING("Empty update"),
         "pf_update_empty");
     if (p->subchannel_list != nullptr) {
-      grpc_lb_subchannel_list_shutdown_and_unref(exec_ctx, p->subchannel_list,
+      grpc_lb_subchannel_list_shutdown_and_unref(p->subchannel_list,
                                                  "sl_shutdown_empty_update");
     }
     p->subchannel_list = subchannel_list;  // Empty list.
@@ -292,7 +286,7 @@ static void pf_update_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
     // We don't yet have a selected subchannel, so replace the current
     // subchannel list immediately.
     if (p->subchannel_list != nullptr) {
-      grpc_lb_subchannel_list_shutdown_and_unref(exec_ctx, p->subchannel_list,
+      grpc_lb_subchannel_list_shutdown_and_unref(p->subchannel_list,
                                                  "pf_update_before_selected");
     }
     p->subchannel_list = subchannel_list;
@@ -317,19 +311,19 @@ static void pf_update_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
         p->selected = sd;
         if (p->subchannel_list != nullptr) {
           grpc_lb_subchannel_list_shutdown_and_unref(
-              exec_ctx, p->subchannel_list, "pf_update_includes_selected");
+              p->subchannel_list, "pf_update_includes_selected");
         }
         p->subchannel_list = subchannel_list;
-        destroy_unselected_subchannels_locked(exec_ctx, p);
+        destroy_unselected_subchannels_locked(p);
         grpc_lb_subchannel_list_ref_for_connectivity_watch(
             subchannel_list, "connectivity_watch+replace_selected");
-        grpc_lb_subchannel_data_start_connectivity_watch(exec_ctx, sd);
+        grpc_lb_subchannel_data_start_connectivity_watch(sd);
         // If there was a previously pending update (which may or may
         // not have contained the currently selected subchannel), drop
         // it, so that it doesn't override what we've done here.
         if (p->latest_pending_subchannel_list != nullptr) {
           grpc_lb_subchannel_list_shutdown_and_unref(
-              exec_ctx, p->latest_pending_subchannel_list,
+              p->latest_pending_subchannel_list,
               "pf_update_includes_selected+outdated");
           p->latest_pending_subchannel_list = nullptr;
         }
@@ -349,8 +343,7 @@ static void pf_update_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
                 (void*)subchannel_list);
       }
       grpc_lb_subchannel_list_shutdown_and_unref(
-          exec_ctx, p->latest_pending_subchannel_list,
-          "sl_outdated_dont_smash");
+          p->latest_pending_subchannel_list, "sl_outdated_dont_smash");
     }
     p->latest_pending_subchannel_list = subchannel_list;
   }
@@ -360,12 +353,11 @@ static void pf_update_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
     grpc_lb_subchannel_list_ref_for_connectivity_watch(
         subchannel_list, "connectivity_watch+update");
     grpc_lb_subchannel_data_start_connectivity_watch(
-        exec_ctx, &subchannel_list->subchannels[0]);
+        &subchannel_list->subchannels[0]);
   }
 }
 
-static void pf_connectivity_changed_locked(grpc_exec_ctx* exec_ctx, void* arg,
-                                           grpc_error* error) {
+static void pf_connectivity_changed_locked(void* arg, grpc_error* error) {
   grpc_lb_subchannel_data* sd = (grpc_lb_subchannel_data*)arg;
   pick_first_lb_policy* p = (pick_first_lb_policy*)sd->subchannel_list->policy;
   if (grpc_lb_pick_first_trace.enabled()) {
@@ -383,18 +375,18 @@ static void pf_connectivity_changed_locked(grpc_exec_ctx* exec_ctx, void* arg,
   }
   // If the policy is shutting down, unref and return.
   if (p->shutdown) {
-    grpc_lb_subchannel_data_stop_connectivity_watch(exec_ctx, sd);
-    grpc_lb_subchannel_data_unref_subchannel(exec_ctx, sd, "pf_shutdown");
-    grpc_lb_subchannel_list_unref_for_connectivity_watch(
-        exec_ctx, sd->subchannel_list, "pf_shutdown");
+    grpc_lb_subchannel_data_stop_connectivity_watch(sd);
+    grpc_lb_subchannel_data_unref_subchannel(sd, "pf_shutdown");
+    grpc_lb_subchannel_list_unref_for_connectivity_watch(sd->subchannel_list,
+                                                         "pf_shutdown");
     return;
   }
   // If the subchannel list is shutting down, stop watching.
   if (sd->subchannel_list->shutting_down || error == GRPC_ERROR_CANCELLED) {
-    grpc_lb_subchannel_data_stop_connectivity_watch(exec_ctx, sd);
-    grpc_lb_subchannel_data_unref_subchannel(exec_ctx, sd, "pf_sl_shutdown");
-    grpc_lb_subchannel_list_unref_for_connectivity_watch(
-        exec_ctx, sd->subchannel_list, "pf_sl_shutdown");
+    grpc_lb_subchannel_data_stop_connectivity_watch(sd);
+    grpc_lb_subchannel_data_unref_subchannel(sd, "pf_sl_shutdown");
+    grpc_lb_subchannel_list_unref_for_connectivity_watch(sd->subchannel_list,
+                                                         "pf_sl_shutdown");
     return;
   }
   // If we're still here, the notification must be for a subchannel in
@@ -410,15 +402,15 @@ static void pf_connectivity_changed_locked(grpc_exec_ctx* exec_ctx, void* arg,
     if (sd->curr_connectivity_state != GRPC_CHANNEL_READY &&
         p->latest_pending_subchannel_list != nullptr) {
       p->selected = nullptr;
-      grpc_lb_subchannel_data_stop_connectivity_watch(exec_ctx, sd);
+      grpc_lb_subchannel_data_stop_connectivity_watch(sd);
       grpc_lb_subchannel_list_unref_for_connectivity_watch(
-          exec_ctx, sd->subchannel_list, "selected_not_ready+switch_to_update");
+          sd->subchannel_list, "selected_not_ready+switch_to_update");
       grpc_lb_subchannel_list_shutdown_and_unref(
-          exec_ctx, p->subchannel_list, "selected_not_ready+switch_to_update");
+          p->subchannel_list, "selected_not_ready+switch_to_update");
       p->subchannel_list = p->latest_pending_subchannel_list;
       p->latest_pending_subchannel_list = nullptr;
       grpc_connectivity_state_set(
-          exec_ctx, &p->state_tracker, GRPC_CHANNEL_TRANSIENT_FAILURE,
+          &p->state_tracker, GRPC_CHANNEL_TRANSIENT_FAILURE,
           GRPC_ERROR_REF(error), "selected_not_ready+switch_to_update");
     } else {
       // TODO(juanlishen): we re-resolve when the selected subchannel goes to
@@ -429,27 +421,26 @@ static void pf_connectivity_changed_locked(grpc_exec_ctx* exec_ctx, void* arg,
       if (sd->curr_connectivity_state == GRPC_CHANNEL_SHUTDOWN ||
           sd->curr_connectivity_state == GRPC_CHANNEL_TRANSIENT_FAILURE) {
         // If the selected channel goes bad, request a re-resolution.
-        grpc_connectivity_state_set(exec_ctx, &p->state_tracker,
-                                    GRPC_CHANNEL_IDLE, GRPC_ERROR_NONE,
+        grpc_connectivity_state_set(&p->state_tracker, GRPC_CHANNEL_IDLE,
+                                    GRPC_ERROR_NONE,
                                     "selected_changed+reresolve");
         p->started_picking = false;
-        grpc_lb_policy_try_reresolve(
-            exec_ctx, &p->base, &grpc_lb_pick_first_trace, GRPC_ERROR_NONE);
+        grpc_lb_policy_try_reresolve(&p->base, &grpc_lb_pick_first_trace,
+                                     GRPC_ERROR_NONE);
       } else {
-        grpc_connectivity_state_set(exec_ctx, &p->state_tracker,
+        grpc_connectivity_state_set(&p->state_tracker,
                                     sd->curr_connectivity_state,
                                     GRPC_ERROR_REF(error), "selected_changed");
       }
       if (sd->curr_connectivity_state != GRPC_CHANNEL_SHUTDOWN) {
         // Renew notification.
-        grpc_lb_subchannel_data_start_connectivity_watch(exec_ctx, sd);
+        grpc_lb_subchannel_data_start_connectivity_watch(sd);
       } else {
         p->selected = nullptr;
-        grpc_lb_subchannel_data_stop_connectivity_watch(exec_ctx, sd);
+        grpc_lb_subchannel_data_stop_connectivity_watch(sd);
         grpc_lb_subchannel_list_unref_for_connectivity_watch(
-            exec_ctx, sd->subchannel_list, "pf_selected_shutdown");
-        grpc_lb_subchannel_data_unref_subchannel(exec_ctx, sd,
-                                                 "pf_selected_shutdown");
+            sd->subchannel_list, "pf_selected_shutdown");
+        grpc_lb_subchannel_data_unref_subchannel(sd, "pf_selected_shutdown");
       }
     }
     return;
@@ -469,15 +460,14 @@ static void pf_connectivity_changed_locked(grpc_exec_ctx* exec_ctx, void* arg,
       // p->subchannel_list.
       if (sd->subchannel_list == p->latest_pending_subchannel_list) {
         GPR_ASSERT(p->subchannel_list != nullptr);
-        grpc_lb_subchannel_list_shutdown_and_unref(exec_ctx, p->subchannel_list,
+        grpc_lb_subchannel_list_shutdown_and_unref(p->subchannel_list,
                                                    "finish_update");
         p->subchannel_list = p->latest_pending_subchannel_list;
         p->latest_pending_subchannel_list = nullptr;
       }
       // Cases 1 and 2.
-      grpc_connectivity_state_set(exec_ctx, &p->state_tracker,
-                                  GRPC_CHANNEL_READY, GRPC_ERROR_NONE,
-                                  "connecting_ready");
+      grpc_connectivity_state_set(&p->state_tracker, GRPC_CHANNEL_READY,
+                                  GRPC_ERROR_NONE, "connecting_ready");
       sd->connected_subchannel = GRPC_CONNECTED_SUBCHANNEL_REF(
           grpc_subchannel_get_connected_subchannel(sd->subchannel),
           "connected");
@@ -487,7 +477,7 @@ static void pf_connectivity_changed_locked(grpc_exec_ctx* exec_ctx, void* arg,
                 (void*)sd->subchannel);
       }
       // Drop all other subchannels, since we are now connected.
-      destroy_unselected_subchannels_locked(exec_ctx, p);
+      destroy_unselected_subchannels_locked(p);
       // Update any calls that were waiting for a pick.
       pending_pick* pp;
       while ((pp = p->pending_picks)) {
@@ -499,15 +489,15 @@ static void pf_connectivity_changed_locked(grpc_exec_ctx* exec_ctx, void* arg,
                   "Servicing pending pick with selected subchannel %p",
                   (void*)p->selected);
         }
-        GRPC_CLOSURE_SCHED(exec_ctx, pp->on_complete, GRPC_ERROR_NONE);
+        GRPC_CLOSURE_SCHED(pp->on_complete, GRPC_ERROR_NONE);
         gpr_free(pp);
       }
       // Renew notification.
-      grpc_lb_subchannel_data_start_connectivity_watch(exec_ctx, sd);
+      grpc_lb_subchannel_data_start_connectivity_watch(sd);
       break;
     }
     case GRPC_CHANNEL_TRANSIENT_FAILURE: {
-      grpc_lb_subchannel_data_stop_connectivity_watch(exec_ctx, sd);
+      grpc_lb_subchannel_data_stop_connectivity_watch(sd);
       do {
         sd->subchannel_list->checking_subchannel =
             (sd->subchannel_list->checking_subchannel + 1) %
@@ -520,29 +510,28 @@ static void pf_connectivity_changed_locked(grpc_exec_ctx* exec_ctx, void* arg,
       if (sd->subchannel_list->checking_subchannel == 0 &&
           sd->subchannel_list == p->subchannel_list) {
         grpc_connectivity_state_set(
-            exec_ctx, &p->state_tracker, GRPC_CHANNEL_TRANSIENT_FAILURE,
+            &p->state_tracker, GRPC_CHANNEL_TRANSIENT_FAILURE,
             GRPC_ERROR_REF(error), "connecting_transient_failure");
       }
       // Reuses the connectivity refs from the previous watch.
-      grpc_lb_subchannel_data_start_connectivity_watch(exec_ctx, sd);
+      grpc_lb_subchannel_data_start_connectivity_watch(sd);
       break;
     }
     case GRPC_CHANNEL_CONNECTING:
     case GRPC_CHANNEL_IDLE: {
       // Only update connectivity state in case 1.
       if (sd->subchannel_list == p->subchannel_list) {
-        grpc_connectivity_state_set(
-            exec_ctx, &p->state_tracker, GRPC_CHANNEL_CONNECTING,
-            GRPC_ERROR_REF(error), "connecting_changed");
+        grpc_connectivity_state_set(&p->state_tracker, GRPC_CHANNEL_CONNECTING,
+                                    GRPC_ERROR_REF(error),
+                                    "connecting_changed");
       }
       // Renew notification.
-      grpc_lb_subchannel_data_start_connectivity_watch(exec_ctx, sd);
+      grpc_lb_subchannel_data_start_connectivity_watch(sd);
       break;
     }
     case GRPC_CHANNEL_SHUTDOWN: {
-      grpc_lb_subchannel_data_stop_connectivity_watch(exec_ctx, sd);
-      grpc_lb_subchannel_data_unref_subchannel(exec_ctx, sd,
-                                               "pf_candidate_shutdown");
+      grpc_lb_subchannel_data_stop_connectivity_watch(sd);
+      grpc_lb_subchannel_data_unref_subchannel(sd, "pf_candidate_shutdown");
       // Advance to next subchannel and check its state.
       grpc_lb_subchannel_data* original_sd = sd;
       do {
@@ -554,31 +543,30 @@ static void pf_connectivity_changed_locked(grpc_exec_ctx* exec_ctx, void* arg,
       } while (sd->subchannel == nullptr && sd != original_sd);
       if (sd == original_sd) {
         grpc_lb_subchannel_list_unref_for_connectivity_watch(
-            exec_ctx, sd->subchannel_list, "pf_exhausted_subchannels");
+            sd->subchannel_list, "pf_exhausted_subchannels");
         if (sd->subchannel_list == p->subchannel_list) {
-          grpc_connectivity_state_set(exec_ctx, &p->state_tracker,
-                                      GRPC_CHANNEL_IDLE, GRPC_ERROR_NONE,
+          grpc_connectivity_state_set(&p->state_tracker, GRPC_CHANNEL_IDLE,
+                                      GRPC_ERROR_NONE,
                                       "exhausted_subchannels+reresolve");
           p->started_picking = false;
-          grpc_lb_policy_try_reresolve(
-              exec_ctx, &p->base, &grpc_lb_pick_first_trace, GRPC_ERROR_NONE);
+          grpc_lb_policy_try_reresolve(&p->base, &grpc_lb_pick_first_trace,
+                                       GRPC_ERROR_NONE);
         }
       } else {
         if (sd->subchannel_list == p->subchannel_list) {
           grpc_connectivity_state_set(
-              exec_ctx, &p->state_tracker, GRPC_CHANNEL_TRANSIENT_FAILURE,
+              &p->state_tracker, GRPC_CHANNEL_TRANSIENT_FAILURE,
               GRPC_ERROR_REF(error), "subchannel_failed");
         }
         // Reuses the connectivity refs from the previous watch.
-        grpc_lb_subchannel_data_start_connectivity_watch(exec_ctx, sd);
+        grpc_lb_subchannel_data_start_connectivity_watch(sd);
       }
     }
   }
 }
 
 static void pf_set_reresolve_closure_locked(
-    grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
-    grpc_closure* request_reresolution) {
+    grpc_lb_policy* policy, grpc_closure* request_reresolution) {
   pick_first_lb_policy* p = (pick_first_lb_policy*)policy;
   GPR_ASSERT(!p->shutdown);
   GPR_ASSERT(policy->request_reresolution == nullptr);
@@ -602,15 +590,14 @@ static void pick_first_factory_ref(grpc_lb_policy_factory* factory) {}
 
 static void pick_first_factory_unref(grpc_lb_policy_factory* factory) {}
 
-static grpc_lb_policy* create_pick_first(grpc_exec_ctx* exec_ctx,
-                                         grpc_lb_policy_factory* factory,
+static grpc_lb_policy* create_pick_first(grpc_lb_policy_factory* factory,
                                          grpc_lb_policy_args* args) {
   GPR_ASSERT(args->client_channel_factory != nullptr);
   pick_first_lb_policy* p = (pick_first_lb_policy*)gpr_zalloc(sizeof(*p));
   if (grpc_lb_pick_first_trace.enabled()) {
     gpr_log(GPR_DEBUG, "Pick First %p created.", (void*)p);
   }
-  pf_update_locked(exec_ctx, &p->base, args);
+  pf_update_locked(&p->base, args);
   grpc_lb_policy_init(&p->base, &pick_first_lb_policy_vtable, args->combiner);
   grpc_subchannel_index_ref();
   return &p->base;

src/core/ext/filters/client_channel/lb_policy/round_robin/round_robin.cc

@@ -154,7 +154,7 @@ static void update_last_ready_subchannel_index_locked(round_robin_lb_policy* p,
   }
 }
 
-static void rr_destroy(grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol) {
+static void rr_destroy(grpc_lb_policy* pol) {
   round_robin_lb_policy* p = (round_robin_lb_policy*)pol;
   if (grpc_lb_round_robin_trace.enabled()) {
     gpr_log(GPR_DEBUG, "[RR %p] Destroying Round Robin policy at %p",
@@ -162,12 +162,12 @@ static void rr_destroy(grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol) {
   }
   GPR_ASSERT(p->subchannel_list == nullptr);
   GPR_ASSERT(p->latest_pending_subchannel_list == nullptr);
-  grpc_connectivity_state_destroy(exec_ctx, &p->state_tracker);
+  grpc_connectivity_state_destroy(&p->state_tracker);
   grpc_subchannel_index_unref();
   gpr_free(p);
 }
 
-static void rr_shutdown_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol) {
+static void rr_shutdown_locked(grpc_lb_policy* pol) {
   round_robin_lb_policy* p = (round_robin_lb_policy*)pol;
   grpc_error* error = GRPC_ERROR_CREATE_FROM_STATIC_STRING("Channel shutdown");
   if (grpc_lb_round_robin_trace.enabled()) {
@@ -178,29 +178,27 @@ static void rr_shutdown_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol) {
   while ((pp = p->pending_picks) != nullptr) {
     p->pending_picks = pp->next;
     *pp->target = nullptr;
-    GRPC_CLOSURE_SCHED(exec_ctx, pp->on_complete, GRPC_ERROR_REF(error));
+    GRPC_CLOSURE_SCHED(pp->on_complete, GRPC_ERROR_REF(error));
     gpr_free(pp);
   }
-  grpc_connectivity_state_set(exec_ctx, &p->state_tracker,
-                              GRPC_CHANNEL_SHUTDOWN, GRPC_ERROR_REF(error),
-                              "rr_shutdown");
+  grpc_connectivity_state_set(&p->state_tracker, GRPC_CHANNEL_SHUTDOWN,
+                              GRPC_ERROR_REF(error), "rr_shutdown");
   if (p->subchannel_list != nullptr) {
-    grpc_lb_subchannel_list_shutdown_and_unref(exec_ctx, p->subchannel_list,
+    grpc_lb_subchannel_list_shutdown_and_unref(p->subchannel_list,
                                                "sl_shutdown_rr_shutdown");
     p->subchannel_list = nullptr;
   }
   if (p->latest_pending_subchannel_list != nullptr) {
     grpc_lb_subchannel_list_shutdown_and_unref(
-        exec_ctx, p->latest_pending_subchannel_list,
-        "sl_shutdown_pending_rr_shutdown");
+        p->latest_pending_subchannel_list, "sl_shutdown_pending_rr_shutdown");
     p->latest_pending_subchannel_list = nullptr;
   }
-  grpc_lb_policy_try_reresolve(exec_ctx, &p->base, &grpc_lb_round_robin_trace,
+  grpc_lb_policy_try_reresolve(&p->base, &grpc_lb_round_robin_trace,
                                GRPC_ERROR_CANCELLED);
   GRPC_ERROR_UNREF(error);
 }
 
-static void rr_cancel_pick_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol,
+static void rr_cancel_pick_locked(grpc_lb_policy* pol,
                                   grpc_connected_subchannel** target,
                                   grpc_error* error) {
   round_robin_lb_policy* p = (round_robin_lb_policy*)pol;
@@ -210,7 +208,7 @@ static void rr_cancel_pick_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol,
     pending_pick* next = pp->next;
     if (pp->target == target) {
       *target = nullptr;
-      GRPC_CLOSURE_SCHED(exec_ctx, pp->on_complete,
+      GRPC_CLOSURE_SCHED(pp->on_complete,
                          GRPC_ERROR_CREATE_REFERENCING_FROM_STATIC_STRING(
                              "Pick cancelled", &error, 1));
       gpr_free(pp);
@@ -223,7 +221,7 @@ static void rr_cancel_pick_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol,
   GRPC_ERROR_UNREF(error);
 }
 
-static void rr_cancel_picks_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol,
+static void rr_cancel_picks_locked(grpc_lb_policy* pol,
                                    uint32_t initial_metadata_flags_mask,
                                    uint32_t initial_metadata_flags_eq,
                                    grpc_error* error) {
@@ -235,7 +233,7 @@ static void rr_cancel_picks_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol,
     if ((pp->initial_metadata_flags & initial_metadata_flags_mask) ==
         initial_metadata_flags_eq) {
       *pp->target = nullptr;
-      GRPC_CLOSURE_SCHED(exec_ctx, pp->on_complete,
+      GRPC_CLOSURE_SCHED(pp->on_complete,
                          GRPC_ERROR_CREATE_REFERENCING_FROM_STATIC_STRING(
                              "Pick cancelled", &error, 1));
       gpr_free(pp);
@@ -248,27 +246,26 @@ static void rr_cancel_picks_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol,
   GRPC_ERROR_UNREF(error);
 }
 
-static void start_picking_locked(grpc_exec_ctx* exec_ctx,
-                                 round_robin_lb_policy* p) {
+static void start_picking_locked(round_robin_lb_policy* p) {
   p->started_picking = true;
   for (size_t i = 0; i < p->subchannel_list->num_subchannels; i++) {
     if (p->subchannel_list->subchannels[i].subchannel != nullptr) {
       grpc_lb_subchannel_list_ref_for_connectivity_watch(p->subchannel_list,
                                                          "connectivity_watch");
       grpc_lb_subchannel_data_start_connectivity_watch(
-          exec_ctx, &p->subchannel_list->subchannels[i]);
+          &p->subchannel_list->subchannels[i]);
     }
   }
 }
 
-static void rr_exit_idle_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol) {
+static void rr_exit_idle_locked(grpc_lb_policy* pol) {
   round_robin_lb_policy* p = (round_robin_lb_policy*)pol;
   if (!p->started_picking) {
-    start_picking_locked(exec_ctx, p);
+    start_picking_locked(p);
   }
 }
 
-static int rr_pick_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol,
+static int rr_pick_locked(grpc_lb_policy* pol,
                           const grpc_lb_policy_pick_args* pick_args,
                           grpc_connected_subchannel** target,
                           grpc_call_context_element* context, void** user_data,
@@ -305,7 +302,7 @@ static int rr_pick_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol,
   }
   /* no pick currently available. Save for later in list of pending picks */
   if (!p->started_picking) {
-    start_picking_locked(exec_ctx, p);
+    start_picking_locked(p);
   }
   pending_pick* pp = (pending_pick*)gpr_malloc(sizeof(*pp));
   pp->next = p->pending_picks;
@@ -348,8 +345,7 @@ static void update_state_counters_locked(grpc_lb_subchannel_data* sd) {
  * (the grpc_lb_subchannel_data associated with the updated subchannel) and the
  * subchannel list \a sd belongs to (sd->subchannel_list). \a error will be used
  * only if the policy transitions to state TRANSIENT_FAILURE. */
-static void update_lb_connectivity_status_locked(grpc_exec_ctx* exec_ctx,
-                                                 grpc_lb_subchannel_data* sd,
+static void update_lb_connectivity_status_locked(grpc_lb_subchannel_data* sd,
                                                  grpc_error* error) {
   /* In priority order. The first rule to match terminates the search (ie, if we
    * are on rule n, all previous rules were unfulfilled).
@@ -377,35 +373,33 @@ static void update_lb_connectivity_status_locked(grpc_exec_ctx* exec_ctx,
   GPR_ASSERT(sd->curr_connectivity_state != GRPC_CHANNEL_IDLE);
   if (subchannel_list->num_ready > 0) {
     /* 1) READY */
-    grpc_connectivity_state_set(exec_ctx, &p->state_tracker, GRPC_CHANNEL_READY,
+    grpc_connectivity_state_set(&p->state_tracker, GRPC_CHANNEL_READY,
                                 GRPC_ERROR_NONE, "rr_ready");
   } else if (sd->curr_connectivity_state == GRPC_CHANNEL_CONNECTING) {
     /* 2) CONNECTING */
-    grpc_connectivity_state_set(exec_ctx, &p->state_tracker,
-                                GRPC_CHANNEL_CONNECTING, GRPC_ERROR_NONE,
-                                "rr_connecting");
+    grpc_connectivity_state_set(&p->state_tracker, GRPC_CHANNEL_CONNECTING,
+                                GRPC_ERROR_NONE, "rr_connecting");
   } else if (subchannel_list->num_shutdown ==
              subchannel_list->num_subchannels) {
     /* 3) IDLE and re-resolve */
-    grpc_connectivity_state_set(exec_ctx, &p->state_tracker, GRPC_CHANNEL_IDLE,
+    grpc_connectivity_state_set(&p->state_tracker, GRPC_CHANNEL_IDLE,
                                 GRPC_ERROR_NONE,
                                 "rr_exhausted_subchannels+reresolve");
     p->started_picking = false;
-    grpc_lb_policy_try_reresolve(exec_ctx, &p->base, &grpc_lb_round_robin_trace,
+    grpc_lb_policy_try_reresolve(&p->base, &grpc_lb_round_robin_trace,
                                  GRPC_ERROR_NONE);
   } else if (subchannel_list->num_shutdown +
                  subchannel_list->num_transient_failures ==
              subchannel_list->num_subchannels) {
     /* 4) TRANSIENT_FAILURE */
-    grpc_connectivity_state_set(exec_ctx, &p->state_tracker,
+    grpc_connectivity_state_set(&p->state_tracker,
                                 GRPC_CHANNEL_TRANSIENT_FAILURE,
                                 GRPC_ERROR_REF(error), "rr_transient_failure");
   }
   GRPC_ERROR_UNREF(error);
 }
 
-static void rr_connectivity_changed_locked(grpc_exec_ctx* exec_ctx, void* arg,
-                                           grpc_error* error) {
+static void rr_connectivity_changed_locked(void* arg, grpc_error* error) {
   grpc_lb_subchannel_data* sd = (grpc_lb_subchannel_data*)arg;
   round_robin_lb_policy* p =
       (round_robin_lb_policy*)sd->subchannel_list->policy;
@@ -423,18 +417,18 @@ static void rr_connectivity_changed_locked(grpc_exec_ctx* exec_ctx, void* arg,
   }
   // If the policy is shutting down, unref and return.
   if (p->shutdown) {
-    grpc_lb_subchannel_data_stop_connectivity_watch(exec_ctx, sd);
-    grpc_lb_subchannel_data_unref_subchannel(exec_ctx, sd, "rr_shutdown");
-    grpc_lb_subchannel_list_unref_for_connectivity_watch(
-        exec_ctx, sd->subchannel_list, "rr_shutdown");
+    grpc_lb_subchannel_data_stop_connectivity_watch(sd);
+    grpc_lb_subchannel_data_unref_subchannel(sd, "rr_shutdown");
+    grpc_lb_subchannel_list_unref_for_connectivity_watch(sd->subchannel_list,
+                                                         "rr_shutdown");
     return;
   }
   // If the subchannel list is shutting down, stop watching.
   if (sd->subchannel_list->shutting_down || error == GRPC_ERROR_CANCELLED) {
-    grpc_lb_subchannel_data_stop_connectivity_watch(exec_ctx, sd);
-    grpc_lb_subchannel_data_unref_subchannel(exec_ctx, sd, "rr_sl_shutdown");
-    grpc_lb_subchannel_list_unref_for_connectivity_watch(
-        exec_ctx, sd->subchannel_list, "rr_sl_shutdown");
+    grpc_lb_subchannel_data_stop_connectivity_watch(sd);
+    grpc_lb_subchannel_data_unref_subchannel(sd, "rr_sl_shutdown");
+    grpc_lb_subchannel_list_unref_for_connectivity_watch(sd->subchannel_list,
+                                                         "rr_sl_shutdown");
     return;
   }
   // If we're still here, the notification must be for a subchannel in
@@ -447,14 +441,13 @@ static void rr_connectivity_changed_locked(grpc_exec_ctx* exec_ctx, void* arg,
   sd->curr_connectivity_state = sd->pending_connectivity_state_unsafe;
   // Update state counters and new overall state.
   update_state_counters_locked(sd);
-  update_lb_connectivity_status_locked(exec_ctx, sd, GRPC_ERROR_REF(error));
+  update_lb_connectivity_status_locked(sd, GRPC_ERROR_REF(error));
   // If the sd's new state is SHUTDOWN, unref the subchannel.
   if (sd->curr_connectivity_state == GRPC_CHANNEL_SHUTDOWN) {
-    grpc_lb_subchannel_data_stop_connectivity_watch(exec_ctx, sd);
-    grpc_lb_subchannel_data_unref_subchannel(exec_ctx, sd,
-                                             "rr_connectivity_shutdown");
+    grpc_lb_subchannel_data_stop_connectivity_watch(sd);
+    grpc_lb_subchannel_data_unref_subchannel(sd, "rr_connectivity_shutdown");
     grpc_lb_subchannel_list_unref_for_connectivity_watch(
-        exec_ctx, sd->subchannel_list, "rr_connectivity_shutdown");
+        sd->subchannel_list, "rr_connectivity_shutdown");
   } else {  // sd not in SHUTDOWN
     if (sd->curr_connectivity_state == GRPC_CHANNEL_READY) {
       if (sd->connected_subchannel == nullptr) {
@@ -482,8 +475,8 @@ static void rr_connectivity_changed_locked(grpc_exec_ctx* exec_ctx, void* arg,
         }
         if (p->subchannel_list != nullptr) {
           // dispose of the current subchannel_list
-          grpc_lb_subchannel_list_shutdown_and_unref(
-              exec_ctx, p->subchannel_list, "sl_phase_out_shutdown");
+          grpc_lb_subchannel_list_shutdown_and_unref(p->subchannel_list,
+                                                     "sl_phase_out_shutdown");
         }
         p->subchannel_list = p->latest_pending_subchannel_list;
         p->latest_pending_subchannel_list = nullptr;
@@ -515,32 +508,30 @@ static void rr_connectivity_changed_locked(grpc_exec_ctx* exec_ctx, void* arg,
                   (void*)p, (void*)selected->subchannel,
                   (void*)p->subchannel_list, (unsigned long)next_ready_index);
         }
-        GRPC_CLOSURE_SCHED(exec_ctx, pp->on_complete, GRPC_ERROR_NONE);
+        GRPC_CLOSURE_SCHED(pp->on_complete, GRPC_ERROR_NONE);
         gpr_free(pp);
       }
     }
     // Renew notification.
-    grpc_lb_subchannel_data_start_connectivity_watch(exec_ctx, sd);
+    grpc_lb_subchannel_data_start_connectivity_watch(sd);
   }
 }
 
 static grpc_connectivity_state rr_check_connectivity_locked(
-    grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol, grpc_error** error) {
+    grpc_lb_policy* pol, grpc_error** error) {
   round_robin_lb_policy* p = (round_robin_lb_policy*)pol;
   return grpc_connectivity_state_get(&p->state_tracker, error);
 }
 
-static void rr_notify_on_state_change_locked(grpc_exec_ctx* exec_ctx,
-                                             grpc_lb_policy* pol,
+static void rr_notify_on_state_change_locked(grpc_lb_policy* pol,
                                              grpc_connectivity_state* current,
                                              grpc_closure* notify) {
   round_robin_lb_policy* p = (round_robin_lb_policy*)pol;
-  grpc_connectivity_state_notify_on_state_change(exec_ctx, &p->state_tracker,
-                                                 current, notify);
+  grpc_connectivity_state_notify_on_state_change(&p->state_tracker, current,
+                                                 notify);
 }
 
-static void rr_ping_one_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol,
-                               grpc_closure* on_initiate,
+static void rr_ping_one_locked(grpc_lb_policy* pol, grpc_closure* on_initiate,
                                grpc_closure* on_ack) {
   round_robin_lb_policy* p = (round_robin_lb_policy*)pol;
   const size_t next_ready_index = get_next_ready_subchannel_index_locked(p);
@@ -549,19 +540,17 @@ static void rr_ping_one_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* pol,
         &p->subchannel_list->subchannels[next_ready_index];
     grpc_connected_subchannel* target = GRPC_CONNECTED_SUBCHANNEL_REF(
         selected->connected_subchannel, "rr_ping");
-    grpc_connected_subchannel_ping(exec_ctx, target, on_initiate, on_ack);
-    GRPC_CONNECTED_SUBCHANNEL_UNREF(exec_ctx, target, "rr_ping");
+    grpc_connected_subchannel_ping(target, on_initiate, on_ack);
+    GRPC_CONNECTED_SUBCHANNEL_UNREF(target, "rr_ping");
   } else {
-    GRPC_CLOSURE_SCHED(
-        exec_ctx, on_initiate,
-        GRPC_ERROR_CREATE_FROM_STATIC_STRING("Round Robin not connected"));
-    GRPC_CLOSURE_SCHED(
-        exec_ctx, on_ack,
-        GRPC_ERROR_CREATE_FROM_STATIC_STRING("Round Robin not connected"));
+    GRPC_CLOSURE_SCHED(on_initiate, GRPC_ERROR_CREATE_FROM_STATIC_STRING(
+                                        "Round Robin not connected"));
+    GRPC_CLOSURE_SCHED(on_ack, GRPC_ERROR_CREATE_FROM_STATIC_STRING(
+                                   "Round Robin not connected"));
   }
 }
 
-static void rr_update_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
+static void rr_update_locked(grpc_lb_policy* policy,
                              const grpc_lb_policy_args* args) {
   round_robin_lb_policy* p = (round_robin_lb_policy*)policy;
   const grpc_arg* arg =
@@ -572,7 +561,7 @@ static void rr_update_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
     // Otherwise, keep using the current subchannel list (ignore this update).
     if (p->subchannel_list == nullptr) {
       grpc_connectivity_state_set(
-          exec_ctx, &p->state_tracker, GRPC_CHANNEL_TRANSIENT_FAILURE,
+          &p->state_tracker, GRPC_CHANNEL_TRANSIENT_FAILURE,
           GRPC_ERROR_CREATE_FROM_STATIC_STRING("Missing update in args"),
           "rr_update_missing");
     }
@@ -584,15 +573,15 @@ static void rr_update_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
             addresses->num_addresses);
   }
   grpc_lb_subchannel_list* subchannel_list = grpc_lb_subchannel_list_create(
-      exec_ctx, &p->base, &grpc_lb_round_robin_trace, addresses, args,
+      &p->base, &grpc_lb_round_robin_trace, addresses, args,
       rr_connectivity_changed_locked);
   if (subchannel_list->num_subchannels == 0) {
     grpc_connectivity_state_set(
-        exec_ctx, &p->state_tracker, GRPC_CHANNEL_TRANSIENT_FAILURE,
+        &p->state_tracker, GRPC_CHANNEL_TRANSIENT_FAILURE,
         GRPC_ERROR_CREATE_FROM_STATIC_STRING("Empty update"),
         "rr_update_empty");
     if (p->subchannel_list != nullptr) {
-      grpc_lb_subchannel_list_shutdown_and_unref(exec_ctx, p->subchannel_list,
+      grpc_lb_subchannel_list_shutdown_and_unref(p->subchannel_list,
                                                  "sl_shutdown_empty_update");
     }
     p->subchannel_list = subchannel_list;  // empty list
@@ -608,7 +597,7 @@ static void rr_update_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
                 (void*)subchannel_list);
       }
       grpc_lb_subchannel_list_shutdown_and_unref(
-          exec_ctx, p->latest_pending_subchannel_list, "sl_outdated");
+          p->latest_pending_subchannel_list, "sl_outdated");
     }
     p->latest_pending_subchannel_list = subchannel_list;
     for (size_t i = 0; i < subchannel_list->num_subchannels; ++i) {
@@ -619,22 +608,21 @@ static void rr_update_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
       grpc_lb_subchannel_list_ref_for_connectivity_watch(subchannel_list,
                                                          "connectivity_watch");
       grpc_lb_subchannel_data_start_connectivity_watch(
-          exec_ctx, &subchannel_list->subchannels[i]);
+          &subchannel_list->subchannels[i]);
     }
   } else {
     // The policy isn't picking yet. Save the update for later, disposing of
     // previous version if any.
     if (p->subchannel_list != nullptr) {
       grpc_lb_subchannel_list_shutdown_and_unref(
-          exec_ctx, p->subchannel_list, "rr_update_before_started_picking");
+          p->subchannel_list, "rr_update_before_started_picking");
     }
     p->subchannel_list = subchannel_list;
   }
 }
 
 static void rr_set_reresolve_closure_locked(
-    grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy,
-    grpc_closure* request_reresolution) {
+    grpc_lb_policy* policy, grpc_closure* request_reresolution) {
   round_robin_lb_policy* p = (round_robin_lb_policy*)policy;
   GPR_ASSERT(!p->shutdown);
   GPR_ASSERT(policy->request_reresolution == nullptr);
@@ -658,8 +646,7 @@ static void round_robin_factory_ref(grpc_lb_policy_factory* factory) {}
 
 static void round_robin_factory_unref(grpc_lb_policy_factory* factory) {}
 
-static grpc_lb_policy* round_robin_create(grpc_exec_ctx* exec_ctx,
-                                          grpc_lb_policy_factory* factory,
+static grpc_lb_policy* round_robin_create(grpc_lb_policy_factory* factory,
                                           grpc_lb_policy_args* args) {
   GPR_ASSERT(args->client_channel_factory != nullptr);
   round_robin_lb_policy* p = (round_robin_lb_policy*)gpr_zalloc(sizeof(*p));
@@ -667,7 +654,7 @@ static grpc_lb_policy* round_robin_create(grpc_exec_ctx* exec_ctx,
   grpc_subchannel_index_ref();
   grpc_connectivity_state_init(&p->state_tracker, GRPC_CHANNEL_IDLE,
                                "round_robin");
-  rr_update_locked(exec_ctx, &p->base, args);
+  rr_update_locked(&p->base, args);
   if (grpc_lb_round_robin_trace.enabled()) {
     gpr_log(GPR_DEBUG, "[RR %p] Created with %lu subchannels", (void*)p,
             (unsigned long)p->subchannel_list->num_subchannels);

src/core/ext/filters/client_channel/lb_policy/subchannel_list.cc

@@ -28,8 +28,7 @@
 #include "src/core/lib/iomgr/sockaddr_utils.h"
 #include "src/core/lib/transport/connectivity_state.h"
 
-void grpc_lb_subchannel_data_unref_subchannel(grpc_exec_ctx* exec_ctx,
-                                              grpc_lb_subchannel_data* sd,
+void grpc_lb_subchannel_data_unref_subchannel(grpc_lb_subchannel_data* sd,
                                               const char* reason) {
   if (sd->subchannel != nullptr) {
     if (sd->subchannel_list->tracer->enabled()) {
@@ -41,23 +40,22 @@ void grpc_lb_subchannel_data_unref_subchannel(grpc_exec_ctx* exec_ctx,
               (size_t)(sd - sd->subchannel_list->subchannels),
               sd->subchannel_list->num_subchannels, sd->subchannel);
     }
-    GRPC_SUBCHANNEL_UNREF(exec_ctx, sd->subchannel, reason);
+    GRPC_SUBCHANNEL_UNREF(sd->subchannel, reason);
     sd->subchannel = nullptr;
     if (sd->connected_subchannel != nullptr) {
-      GRPC_CONNECTED_SUBCHANNEL_UNREF(exec_ctx, sd->connected_subchannel,
-                                      reason);
+      GRPC_CONNECTED_SUBCHANNEL_UNREF(sd->connected_subchannel, reason);
       sd->connected_subchannel = nullptr;
     }
     if (sd->user_data != nullptr) {
       GPR_ASSERT(sd->user_data_vtable != nullptr);
-      sd->user_data_vtable->destroy(exec_ctx, sd->user_data);
+      sd->user_data_vtable->destroy(sd->user_data);
       sd->user_data = nullptr;
     }
   }
 }
 
 void grpc_lb_subchannel_data_start_connectivity_watch(
-    grpc_exec_ctx* exec_ctx, grpc_lb_subchannel_data* sd) {
+    grpc_lb_subchannel_data* sd) {
   if (sd->subchannel_list->tracer->enabled()) {
     gpr_log(GPR_DEBUG,
             "[%s %p] subchannel list %p index %" PRIuPTR " of %" PRIuPTR
@@ -69,13 +67,13 @@ void grpc_lb_subchannel_data_start_connectivity_watch(
   }
   sd->connectivity_notification_pending = true;
   grpc_subchannel_notify_on_state_change(
-      exec_ctx, sd->subchannel, sd->subchannel_list->policy->interested_parties,
+      sd->subchannel, sd->subchannel_list->policy->interested_parties,
       &sd->pending_connectivity_state_unsafe,
       &sd->connectivity_changed_closure);
 }
 
 void grpc_lb_subchannel_data_stop_connectivity_watch(
-    grpc_exec_ctx* exec_ctx, grpc_lb_subchannel_data* sd) {
+    grpc_lb_subchannel_data* sd) {
   if (sd->subchannel_list->tracer->enabled()) {
     gpr_log(GPR_DEBUG,
             "[%s %p] subchannel list %p index %" PRIuPTR " of %" PRIuPTR
@@ -90,7 +88,7 @@ void grpc_lb_subchannel_data_stop_connectivity_watch(
 }
 
 grpc_lb_subchannel_list* grpc_lb_subchannel_list_create(
-    grpc_exec_ctx* exec_ctx, grpc_lb_policy* p, grpc_core::TraceFlag* tracer,
+    grpc_lb_policy* p, grpc_core::TraceFlag* tracer,
     const grpc_lb_addresses* addresses, const grpc_lb_policy_args* args,
     grpc_iomgr_cb_func connectivity_changed_cb) {
   grpc_lb_subchannel_list* subchannel_list =
@@ -124,8 +122,8 @@ grpc_lb_subchannel_list* grpc_lb_subchannel_list_create(
     gpr_free(addr_arg.value.string);
     sc_args.args = new_args;
     grpc_subchannel* subchannel = grpc_client_channel_factory_create_subchannel(
-        exec_ctx, args->client_channel_factory, &sc_args);
-    grpc_channel_args_destroy(exec_ctx, new_args);
+        args->client_channel_factory, &sc_args);
+    grpc_channel_args_destroy(new_args);
     if (subchannel == nullptr) {
       // Subchannel could not be created.
       if (tracer->enabled()) {
@@ -172,8 +170,7 @@ grpc_lb_subchannel_list* grpc_lb_subchannel_list_create(
   return subchannel_list;
 }
 
-static void subchannel_list_destroy(grpc_exec_ctx* exec_ctx,
-                                    grpc_lb_subchannel_list* subchannel_list) {
+static void subchannel_list_destroy(grpc_lb_subchannel_list* subchannel_list) {
   if (subchannel_list->tracer->enabled()) {
     gpr_log(GPR_DEBUG, "[%s %p] Destroying subchannel_list %p",
             subchannel_list->tracer->name(), subchannel_list->policy,
@@ -181,8 +178,7 @@ static void subchannel_list_destroy(grpc_exec_ctx* exec_ctx,
   }
   for (size_t i = 0; i < subchannel_list->num_subchannels; i++) {
     grpc_lb_subchannel_data* sd = &subchannel_list->subchannels[i];
-    grpc_lb_subchannel_data_unref_subchannel(exec_ctx, sd,
-                                             "subchannel_list_destroy");
+    grpc_lb_subchannel_data_unref_subchannel(sd, "subchannel_list_destroy");
   }
   gpr_free(subchannel_list->subchannels);
   gpr_free(subchannel_list);
@@ -200,8 +196,7 @@ void grpc_lb_subchannel_list_ref(grpc_lb_subchannel_list* subchannel_list,
   }
 }
 
-void grpc_lb_subchannel_list_unref(grpc_exec_ctx* exec_ctx,
-                                   grpc_lb_subchannel_list* subchannel_list,
+void grpc_lb_subchannel_list_unref(grpc_lb_subchannel_list* subchannel_list,
                                    const char* reason) {
   const bool done = gpr_unref(&subchannel_list->refcount);
   if (subchannel_list->tracer->enabled()) {
@@ -212,7 +207,7 @@ void grpc_lb_subchannel_list_unref(grpc_exec_ctx* exec_ctx,
             reason);
   }
   if (done) {
-    subchannel_list_destroy(exec_ctx, subchannel_list);
+    subchannel_list_destroy(subchannel_list);
   }
 }
 
@@ -223,14 +218,13 @@ void grpc_lb_subchannel_list_ref_for_connectivity_watch(
 }
 
 void grpc_lb_subchannel_list_unref_for_connectivity_watch(
-    grpc_exec_ctx* exec_ctx, grpc_lb_subchannel_list* subchannel_list,
-    const char* reason) {
-  GRPC_LB_POLICY_WEAK_UNREF(exec_ctx, subchannel_list->policy, reason);
-  grpc_lb_subchannel_list_unref(exec_ctx, subchannel_list, reason);
+    grpc_lb_subchannel_list* subchannel_list, const char* reason) {
+  GRPC_LB_POLICY_WEAK_UNREF(subchannel_list->policy, reason);
+  grpc_lb_subchannel_list_unref(subchannel_list, reason);
 }
 
 static void subchannel_data_cancel_connectivity_watch(
-    grpc_exec_ctx* exec_ctx, grpc_lb_subchannel_data* sd, const char* reason) {
+    grpc_lb_subchannel_data* sd, const char* reason) {
   if (sd->subchannel_list->tracer->enabled()) {
     gpr_log(GPR_DEBUG,
             "[%s %p] subchannel list %p index %" PRIuPTR " of %" PRIuPTR
@@ -240,14 +234,12 @@ static void subchannel_data_cancel_connectivity_watch(
             (size_t)(sd - sd->subchannel_list->subchannels),
             sd->subchannel_list->num_subchannels, sd->subchannel, reason);
   }
-  grpc_subchannel_notify_on_state_change(exec_ctx, sd->subchannel, nullptr,
-                                         nullptr,
+  grpc_subchannel_notify_on_state_change(sd->subchannel, nullptr, nullptr,
                                          &sd->connectivity_changed_closure);
 }
 
 void grpc_lb_subchannel_list_shutdown_and_unref(
-    grpc_exec_ctx* exec_ctx, grpc_lb_subchannel_list* subchannel_list,
-    const char* reason) {
+    grpc_lb_subchannel_list* subchannel_list, const char* reason) {
   if (subchannel_list->tracer->enabled()) {
     gpr_log(GPR_DEBUG, "[%s %p] Shutting down subchannel_list %p (%s)",
             subchannel_list->tracer->name(), subchannel_list->policy,
@@ -261,10 +253,10 @@ void grpc_lb_subchannel_list_shutdown_and_unref(
     // the callback is responsible for unreffing the subchannel.
     // Otherwise, unref the subchannel directly.
     if (sd->connectivity_notification_pending) {
-      subchannel_data_cancel_connectivity_watch(exec_ctx, sd, reason);
+      subchannel_data_cancel_connectivity_watch(sd, reason);
     } else if (sd->subchannel != nullptr) {
-      grpc_lb_subchannel_data_unref_subchannel(exec_ctx, sd, reason);
+      grpc_lb_subchannel_data_unref_subchannel(sd, reason);
     }
   }
-  grpc_lb_subchannel_list_unref(exec_ctx, subchannel_list, reason);
+  grpc_lb_subchannel_list_unref(subchannel_list, reason);
 }

src/core/ext/filters/client_channel/lb_policy/subchannel_list.h

@@ -65,8 +65,7 @@ typedef struct {
 } grpc_lb_subchannel_data;
 
 /// Unrefs the subchannel contained in sd.
-void grpc_lb_subchannel_data_unref_subchannel(grpc_exec_ctx* exec_ctx,
-                                              grpc_lb_subchannel_data* sd,
+void grpc_lb_subchannel_data_unref_subchannel(grpc_lb_subchannel_data* sd,
                                               const char* reason);
 
 /// Starts watching the connectivity state of the subchannel.
@@ -74,11 +73,11 @@ void grpc_lb_subchannel_data_unref_subchannel(grpc_exec_ctx* exec_ctx,
 /// grpc_lb_subchannel_data_stop_connectivity_watch() or again call
 /// grpc_lb_subchannel_data_start_connectivity_watch().
 void grpc_lb_subchannel_data_start_connectivity_watch(
-    grpc_exec_ctx* exec_ctx, grpc_lb_subchannel_data* sd);
+    grpc_lb_subchannel_data* sd);
 
 /// Stops watching the connectivity state of the subchannel.
 void grpc_lb_subchannel_data_stop_connectivity_watch(
-    grpc_exec_ctx* exec_ctx, grpc_lb_subchannel_data* sd);
+    grpc_lb_subchannel_data* sd);
 
 struct grpc_lb_subchannel_list {
   /** backpointer to owning policy */
@@ -117,15 +116,14 @@ struct grpc_lb_subchannel_list {
 };
 
 grpc_lb_subchannel_list* grpc_lb_subchannel_list_create(
-    grpc_exec_ctx* exec_ctx, grpc_lb_policy* p, grpc_core::TraceFlag* tracer,
+    grpc_lb_policy* p, grpc_core::TraceFlag* tracer,
     const grpc_lb_addresses* addresses, const grpc_lb_policy_args* args,
     grpc_iomgr_cb_func connectivity_changed_cb);
 
 void grpc_lb_subchannel_list_ref(grpc_lb_subchannel_list* subchannel_list,
                                  const char* reason);
 
-void grpc_lb_subchannel_list_unref(grpc_exec_ctx* exec_ctx,
-                                   grpc_lb_subchannel_list* subchannel_list,
+void grpc_lb_subchannel_list_unref(grpc_lb_subchannel_list* subchannel_list,
                                    const char* reason);
 
 /// Takes and releases refs needed for a connectivity notification.
@@ -133,13 +131,11 @@ void grpc_lb_subchannel_list_unref(grpc_exec_ctx* exec_ctx,
 void grpc_lb_subchannel_list_ref_for_connectivity_watch(
     grpc_lb_subchannel_list* subchannel_list, const char* reason);
 void grpc_lb_subchannel_list_unref_for_connectivity_watch(
-    grpc_exec_ctx* exec_ctx, grpc_lb_subchannel_list* subchannel_list,
-    const char* reason);
+    grpc_lb_subchannel_list* subchannel_list, const char* reason);
 
 /// Mark subchannel_list as discarded. Unsubscribes all its subchannels. The
 /// connectivity state notification callback will ultimately unref it.
 void grpc_lb_subchannel_list_shutdown_and_unref(
-    grpc_exec_ctx* exec_ctx, grpc_lb_subchannel_list* subchannel_list,
-    const char* reason);
+    grpc_lb_subchannel_list* subchannel_list, const char* reason);
 
 #endif /* GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_LB_POLICY_SUBCHANNEL_LIST_H */

src/core/ext/filters/client_channel/lb_policy_factory.cc

@@ -112,13 +112,11 @@ int grpc_lb_addresses_cmp(const grpc_lb_addresses* addresses1,
   return 0;
 }
 
-void grpc_lb_addresses_destroy(grpc_exec_ctx* exec_ctx,
-                               grpc_lb_addresses* addresses) {
+void grpc_lb_addresses_destroy(grpc_lb_addresses* addresses) {
   for (size_t i = 0; i < addresses->num_addresses; ++i) {
     gpr_free(addresses->addresses[i].balancer_name);
     if (addresses->addresses[i].user_data != nullptr) {
-      addresses->user_data_vtable->destroy(exec_ctx,
-                                           addresses->addresses[i].user_data);
+      addresses->user_data_vtable->destroy(addresses->addresses[i].user_data);
     }
   }
   gpr_free(addresses->addresses);
@@ -128,8 +126,8 @@ void grpc_lb_addresses_destroy(grpc_exec_ctx* exec_ctx,
 static void* lb_addresses_copy(void* addresses) {
   return grpc_lb_addresses_copy((grpc_lb_addresses*)addresses);
 }
-static void lb_addresses_destroy(grpc_exec_ctx* exec_ctx, void* addresses) {
-  grpc_lb_addresses_destroy(exec_ctx, (grpc_lb_addresses*)addresses);
+static void lb_addresses_destroy(void* addresses) {
+  grpc_lb_addresses_destroy((grpc_lb_addresses*)addresses);
 }
 static int lb_addresses_cmp(void* addresses1, void* addresses2) {
   return grpc_lb_addresses_cmp((grpc_lb_addresses*)addresses1,
@@ -162,8 +160,7 @@ void grpc_lb_policy_factory_unref(grpc_lb_policy_factory* factory) {
 }
 
 grpc_lb_policy* grpc_lb_policy_factory_create_lb_policy(
-    grpc_exec_ctx* exec_ctx, grpc_lb_policy_factory* factory,
-    grpc_lb_policy_args* args) {
+    grpc_lb_policy_factory* factory, grpc_lb_policy_args* args) {
   if (factory == nullptr) return nullptr;
-  return factory->vtable->create_lb_policy(exec_ctx, factory, args);
+  return factory->vtable->create_lb_policy(factory, args);
 }

src/core/ext/filters/client_channel/lb_policy_factory.h

@@ -50,7 +50,7 @@ typedef struct grpc_lb_address {
 
 typedef struct grpc_lb_user_data_vtable {
   void* (*copy)(void*);
-  void (*destroy)(grpc_exec_ctx* exec_ctx, void*);
+  void (*destroy)(void*);
   int (*cmp)(void*, void*);
 } grpc_lb_user_data_vtable;
 
@@ -91,8 +91,7 @@ int grpc_lb_addresses_cmp(const grpc_lb_addresses* addresses1,
                           const grpc_lb_addresses* addresses2);
 
 /** Destroys \a addresses. */
-void grpc_lb_addresses_destroy(grpc_exec_ctx* exec_ctx,
-                               grpc_lb_addresses* addresses);
+void grpc_lb_addresses_destroy(grpc_lb_addresses* addresses);
 
 /** Returns a channel arg containing \a addresses. */
 grpc_arg grpc_lb_addresses_create_channel_arg(
@@ -114,8 +113,7 @@ struct grpc_lb_policy_factory_vtable {
   void (*unref)(grpc_lb_policy_factory* factory);
 
   /** Implementation of grpc_lb_policy_factory_create_lb_policy */
-  grpc_lb_policy* (*create_lb_policy)(grpc_exec_ctx* exec_ctx,
-                                      grpc_lb_policy_factory* factory,
+  grpc_lb_policy* (*create_lb_policy)(grpc_lb_policy_factory* factory,
                                       grpc_lb_policy_args* args);
 
   /** Name for the LB policy this factory implements */
@@ -127,7 +125,6 @@ void grpc_lb_policy_factory_unref(grpc_lb_policy_factory* factory);
 
 /** Create a lb_policy instance. */
 grpc_lb_policy* grpc_lb_policy_factory_create_lb_policy(
-    grpc_exec_ctx* exec_ctx, grpc_lb_policy_factory* factory,
-    grpc_lb_policy_args* args);
+    grpc_lb_policy_factory* factory, grpc_lb_policy_args* args);
 
 #endif /* GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_LB_POLICY_FACTORY_H */

src/core/ext/filters/client_channel/lb_policy_registry.cc

@@ -61,10 +61,10 @@ static grpc_lb_policy_factory* lookup_factory(const char* name) {
   return nullptr;
 }
 
-grpc_lb_policy* grpc_lb_policy_create(grpc_exec_ctx* exec_ctx, const char* name,
+grpc_lb_policy* grpc_lb_policy_create(const char* name,
                                       grpc_lb_policy_args* args) {
   grpc_lb_policy_factory* factory = lookup_factory(name);
   grpc_lb_policy* lb_policy =
-      grpc_lb_policy_factory_create_lb_policy(exec_ctx, factory, args);
+      grpc_lb_policy_factory_create_lb_policy(factory, args);
   return lb_policy;
 }

src/core/ext/filters/client_channel/lb_policy_registry.h

@@ -34,7 +34,7 @@ void grpc_register_lb_policy(grpc_lb_policy_factory* factory);
  *
  * If \a name is NULL, the default factory from \a grpc_lb_policy_registry_init
  * will be returned. */
-grpc_lb_policy* grpc_lb_policy_create(grpc_exec_ctx* exec_ctx, const char* name,
+grpc_lb_policy* grpc_lb_policy_create(const char* name,
                                       grpc_lb_policy_args* args);
 
 #endif /* GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_LB_POLICY_REGISTRY_H */

src/core/ext/filters/client_channel/proxy_mapper.cc

@@ -23,24 +23,22 @@ void grpc_proxy_mapper_init(const grpc_proxy_mapper_vtable* vtable,
   mapper->vtable = vtable;
 }
 
-bool grpc_proxy_mapper_map_name(grpc_exec_ctx* exec_ctx,
-                                grpc_proxy_mapper* mapper,
+bool grpc_proxy_mapper_map_name(grpc_proxy_mapper* mapper,
                                 const char* server_uri,
                                 const grpc_channel_args* args,
                                 char** name_to_resolve,
                                 grpc_channel_args** new_args) {
-  return mapper->vtable->map_name(exec_ctx, mapper, server_uri, args,
-                                  name_to_resolve, new_args);
+  return mapper->vtable->map_name(mapper, server_uri, args, name_to_resolve,
+                                  new_args);
 }
 
-bool grpc_proxy_mapper_map_address(grpc_exec_ctx* exec_ctx,
-                                   grpc_proxy_mapper* mapper,
+bool grpc_proxy_mapper_map_address(grpc_proxy_mapper* mapper,
                                    const grpc_resolved_address* address,
                                    const grpc_channel_args* args,
                                    grpc_resolved_address** new_address,
                                    grpc_channel_args** new_args) {
-  return mapper->vtable->map_address(exec_ctx, mapper, address, args,
-                                     new_address, new_args);
+  return mapper->vtable->map_address(mapper, address, args, new_address,
+                                     new_args);
 }
 
 void grpc_proxy_mapper_destroy(grpc_proxy_mapper* mapper) {

src/core/ext/filters/client_channel/proxy_mapper.h

@@ -32,14 +32,14 @@ typedef struct {
   /// If no proxy is needed, returns false.
   /// Otherwise, sets \a name_to_resolve, optionally sets \a new_args,
   /// and returns true.
-  bool (*map_name)(grpc_exec_ctx* exec_ctx, grpc_proxy_mapper* mapper,
-                   const char* server_uri, const grpc_channel_args* args,
-                   char** name_to_resolve, grpc_channel_args** new_args);
+  bool (*map_name)(grpc_proxy_mapper* mapper, const char* server_uri,
+                   const grpc_channel_args* args, char** name_to_resolve,
+                   grpc_channel_args** new_args);
   /// Determines the proxy address to use to contact \a address.
   /// If no proxy is needed, returns false.
   /// Otherwise, sets \a new_address, optionally sets \a new_args, and
   /// returns true.
-  bool (*map_address)(grpc_exec_ctx* exec_ctx, grpc_proxy_mapper* mapper,
+  bool (*map_address)(grpc_proxy_mapper* mapper,
                       const grpc_resolved_address* address,
                       const grpc_channel_args* args,
                       grpc_resolved_address** new_address,
@@ -55,15 +55,13 @@ struct grpc_proxy_mapper {
 void grpc_proxy_mapper_init(const grpc_proxy_mapper_vtable* vtable,
                             grpc_proxy_mapper* mapper);
 
-bool grpc_proxy_mapper_map_name(grpc_exec_ctx* exec_ctx,
-                                grpc_proxy_mapper* mapper,
+bool grpc_proxy_mapper_map_name(grpc_proxy_mapper* mapper,
                                 const char* server_uri,
                                 const grpc_channel_args* args,
                                 char** name_to_resolve,
                                 grpc_channel_args** new_args);
 
-bool grpc_proxy_mapper_map_address(grpc_exec_ctx* exec_ctx,
-                                   grpc_proxy_mapper* mapper,
+bool grpc_proxy_mapper_map_address(grpc_proxy_mapper* mapper,
                                    const grpc_resolved_address* address,
                                    const grpc_channel_args* args,
                                    grpc_resolved_address** new_address,

src/core/ext/filters/client_channel/proxy_mapper_registry.cc

@@ -46,14 +46,13 @@ static void grpc_proxy_mapper_list_register(grpc_proxy_mapper_list* list,
   ++list->num_mappers;
 }
 
-static bool grpc_proxy_mapper_list_map_name(grpc_exec_ctx* exec_ctx,
-                                            grpc_proxy_mapper_list* list,
+static bool grpc_proxy_mapper_list_map_name(grpc_proxy_mapper_list* list,
                                             const char* server_uri,
                                             const grpc_channel_args* args,
                                             char** name_to_resolve,
                                             grpc_channel_args** new_args) {
   for (size_t i = 0; i < list->num_mappers; ++i) {
-    if (grpc_proxy_mapper_map_name(exec_ctx, list->list[i], server_uri, args,
+    if (grpc_proxy_mapper_map_name(list->list[i], server_uri, args,
                                    name_to_resolve, new_args)) {
       return true;
     }
@@ -62,12 +61,12 @@ static bool grpc_proxy_mapper_list_map_name(grpc_exec_ctx* exec_ctx,
 }
 
 static bool grpc_proxy_mapper_list_map_address(
-    grpc_exec_ctx* exec_ctx, grpc_proxy_mapper_list* list,
-    const grpc_resolved_address* address, const grpc_channel_args* args,
-    grpc_resolved_address** new_address, grpc_channel_args** new_args) {
+    grpc_proxy_mapper_list* list, const grpc_resolved_address* address,
+    const grpc_channel_args* args, grpc_resolved_address** new_address,
+    grpc_channel_args** new_args) {
   for (size_t i = 0; i < list->num_mappers; ++i) {
-    if (grpc_proxy_mapper_map_address(exec_ctx, list->list[i], address, args,
-                                      new_address, new_args)) {
+    if (grpc_proxy_mapper_map_address(list->list[i], address, args, new_address,
+                                      new_args)) {
       return true;
     }
   }
@@ -105,20 +104,17 @@ void grpc_proxy_mapper_register(bool at_start, grpc_proxy_mapper* mapper) {
   grpc_proxy_mapper_list_register(&g_proxy_mapper_list, at_start, mapper);
 }
 
-bool grpc_proxy_mappers_map_name(grpc_exec_ctx* exec_ctx,
-                                 const char* server_uri,
+bool grpc_proxy_mappers_map_name(const char* server_uri,
                                  const grpc_channel_args* args,
                                  char** name_to_resolve,
                                  grpc_channel_args** new_args) {
-  return grpc_proxy_mapper_list_map_name(exec_ctx, &g_proxy_mapper_list,
-                                         server_uri, args, name_to_resolve,
-                                         new_args);
+  return grpc_proxy_mapper_list_map_name(&g_proxy_mapper_list, server_uri, args,
+                                         name_to_resolve, new_args);
 }
-bool grpc_proxy_mappers_map_address(grpc_exec_ctx* exec_ctx,
-                                    const grpc_resolved_address* address,
+bool grpc_proxy_mappers_map_address(const grpc_resolved_address* address,
                                     const grpc_channel_args* args,
                                     grpc_resolved_address** new_address,
                                     grpc_channel_args** new_args) {
-  return grpc_proxy_mapper_list_map_address(
-      exec_ctx, &g_proxy_mapper_list, address, args, new_address, new_args);
+  return grpc_proxy_mapper_list_map_address(&g_proxy_mapper_list, address, args,
+                                            new_address, new_args);
 }

src/core/ext/filters/client_channel/proxy_mapper_registry.h

@@ -29,14 +29,12 @@ void grpc_proxy_mapper_registry_shutdown();
 /// the list.  Otherwise, it will be added to the end.
 void grpc_proxy_mapper_register(bool at_start, grpc_proxy_mapper* mapper);
 
-bool grpc_proxy_mappers_map_name(grpc_exec_ctx* exec_ctx,
-                                 const char* server_uri,
+bool grpc_proxy_mappers_map_name(const char* server_uri,
                                  const grpc_channel_args* args,
                                  char** name_to_resolve,
                                  grpc_channel_args** new_args);
 
-bool grpc_proxy_mappers_map_address(grpc_exec_ctx* exec_ctx,
-                                    const grpc_resolved_address* address,
+bool grpc_proxy_mappers_map_address(const grpc_resolved_address* address,
                                     const grpc_channel_args* args,
                                     grpc_resolved_address** new_address,
                                     grpc_channel_args** new_args);

src/core/ext/filters/client_channel/resolver.cc

@@ -46,8 +46,8 @@ void grpc_resolver_ref(grpc_resolver* resolver) {
 }
 
 #ifndef NDEBUG
-void grpc_resolver_unref(grpc_exec_ctx* exec_ctx, grpc_resolver* resolver,
-                         const char* file, int line, const char* reason) {
+void grpc_resolver_unref(grpc_resolver* resolver, const char* file, int line,
+                         const char* reason) {
   if (grpc_trace_resolver_refcount.enabled()) {
     gpr_atm old_refs = gpr_atm_no_barrier_load(&resolver->refs.count);
     gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG,
@@ -55,27 +55,25 @@ void grpc_resolver_unref(grpc_exec_ctx* exec_ctx, grpc_resolver* resolver,
             old_refs, old_refs - 1, reason);
   }
 #else
-void grpc_resolver_unref(grpc_exec_ctx* exec_ctx, grpc_resolver* resolver) {
+void grpc_resolver_unref(grpc_resolver* resolver) {
 #endif
   if (gpr_unref(&resolver->refs)) {
     grpc_combiner* combiner = resolver->combiner;
-    resolver->vtable->destroy(exec_ctx, resolver);
-    GRPC_COMBINER_UNREF(exec_ctx, combiner, "resolver");
+    resolver->vtable->destroy(resolver);
+    GRPC_COMBINER_UNREF(combiner, "resolver");
   }
 }
 
-void grpc_resolver_shutdown_locked(grpc_exec_ctx* exec_ctx,
-                                   grpc_resolver* resolver) {
-  resolver->vtable->shutdown_locked(exec_ctx, resolver);
+void grpc_resolver_shutdown_locked(grpc_resolver* resolver) {
+  resolver->vtable->shutdown_locked(resolver);
 }
 
-void grpc_resolver_channel_saw_error_locked(grpc_exec_ctx* exec_ctx,
-                                            grpc_resolver* resolver) {
-  resolver->vtable->channel_saw_error_locked(exec_ctx, resolver);
+void grpc_resolver_channel_saw_error_locked(grpc_resolver* resolver) {
+  resolver->vtable->channel_saw_error_locked(resolver);
 }
 
-void grpc_resolver_next_locked(grpc_exec_ctx* exec_ctx, grpc_resolver* resolver,
+void grpc_resolver_next_locked(grpc_resolver* resolver,
                                grpc_channel_args** result,
                                grpc_closure* on_complete) {
-  resolver->vtable->next_locked(exec_ctx, resolver, result, on_complete);
+  resolver->vtable->next_locked(resolver, result, on_complete);
 }

src/core/ext/filters/client_channel/resolver.h

@@ -35,43 +35,40 @@ struct grpc_resolver {
 };
 
 struct grpc_resolver_vtable {
-  void (*destroy)(grpc_exec_ctx* exec_ctx, grpc_resolver* resolver);
-  void (*shutdown_locked)(grpc_exec_ctx* exec_ctx, grpc_resolver* resolver);
-  void (*channel_saw_error_locked)(grpc_exec_ctx* exec_ctx,
-                                   grpc_resolver* resolver);
-  void (*next_locked)(grpc_exec_ctx* exec_ctx, grpc_resolver* resolver,
-                      grpc_channel_args** result, grpc_closure* on_complete);
+  void (*destroy)(grpc_resolver* resolver);
+  void (*shutdown_locked)(grpc_resolver* resolver);
+  void (*channel_saw_error_locked)(grpc_resolver* resolver);
+  void (*next_locked)(grpc_resolver* resolver, grpc_channel_args** result,
+                      grpc_closure* on_complete);
 };
 
 #ifndef NDEBUG
 #define GRPC_RESOLVER_REF(p, r) grpc_resolver_ref((p), __FILE__, __LINE__, (r))
-#define GRPC_RESOLVER_UNREF(e, p, r) \
-  grpc_resolver_unref((e), (p), __FILE__, __LINE__, (r))
+#define GRPC_RESOLVER_UNREF(p, r) \
+  grpc_resolver_unref((p), __FILE__, __LINE__, (r))
 void grpc_resolver_ref(grpc_resolver* policy, const char* file, int line,
                        const char* reason);
-void grpc_resolver_unref(grpc_exec_ctx* exec_ctx, grpc_resolver* policy,
-                         const char* file, int line, const char* reason);
+void grpc_resolver_unref(grpc_resolver* policy, const char* file, int line,
+                         const char* reason);
 #else
 #define GRPC_RESOLVER_REF(p, r) grpc_resolver_ref((p))
-#define GRPC_RESOLVER_UNREF(e, p, r) grpc_resolver_unref((e), (p))
+#define GRPC_RESOLVER_UNREF(p, r) grpc_resolver_unref((p))
 void grpc_resolver_ref(grpc_resolver* policy);
-void grpc_resolver_unref(grpc_exec_ctx* exec_ctx, grpc_resolver* policy);
+void grpc_resolver_unref(grpc_resolver* policy);
 #endif
 
 void grpc_resolver_init(grpc_resolver* resolver,
                         const grpc_resolver_vtable* vtable,
                         grpc_combiner* combiner);
 
-void grpc_resolver_shutdown_locked(grpc_exec_ctx* exec_ctx,
-                                   grpc_resolver* resolver);
+void grpc_resolver_shutdown_locked(grpc_resolver* resolver);
 
 /** Notification that the channel has seen an error on some address.
     Can be used as a hint that re-resolution is desirable soon.
 
     Must be called from the combiner passed as a resolver_arg at construction
     time.*/
-void grpc_resolver_channel_saw_error_locked(grpc_exec_ctx* exec_ctx,
-                                            grpc_resolver* resolver);
+void grpc_resolver_channel_saw_error_locked(grpc_resolver* resolver);
 
 /** Get the next result from the resolver.  Expected to set \a *result with
     new channel args and then schedule \a on_complete for execution.
@@ -81,7 +78,7 @@ void grpc_resolver_channel_saw_error_locked(grpc_exec_ctx* exec_ctx,
 
     Must be called from the combiner passed as a resolver_arg at construction
     time.*/
-void grpc_resolver_next_locked(grpc_exec_ctx* exec_ctx, grpc_resolver* resolver,
+void grpc_resolver_next_locked(grpc_resolver* resolver,
                                grpc_channel_args** result,
                                grpc_closure* on_complete);
 

src/core/ext/filters/client_channel/resolver/dns/c_ares/dns_resolver_ares.cc

@@ -97,17 +97,14 @@ typedef struct {
   char* service_config_json;
 } ares_dns_resolver;
 
-static void dns_ares_destroy(grpc_exec_ctx* exec_ctx, grpc_resolver* r);
+static void dns_ares_destroy(grpc_resolver* r);
 
-static void dns_ares_start_resolving_locked(grpc_exec_ctx* exec_ctx,
-                                            ares_dns_resolver* r);
-static void dns_ares_maybe_finish_next_locked(grpc_exec_ctx* exec_ctx,
-                                              ares_dns_resolver* r);
+static void dns_ares_start_resolving_locked(ares_dns_resolver* r);
+static void dns_ares_maybe_finish_next_locked(ares_dns_resolver* r);
 
-static void dns_ares_shutdown_locked(grpc_exec_ctx* exec_ctx, grpc_resolver* r);
-static void dns_ares_channel_saw_error_locked(grpc_exec_ctx* exec_ctx,
-                                              grpc_resolver* r);
-static void dns_ares_next_locked(grpc_exec_ctx* exec_ctx, grpc_resolver* r,
+static void dns_ares_shutdown_locked(grpc_resolver* r);
+static void dns_ares_channel_saw_error_locked(grpc_resolver* r);
+static void dns_ares_next_locked(grpc_resolver* r,
                                  grpc_channel_args** target_result,
                                  grpc_closure* on_complete);
 
@@ -115,43 +112,39 @@ static const grpc_resolver_vtable dns_ares_resolver_vtable = {
     dns_ares_destroy, dns_ares_shutdown_locked,
     dns_ares_channel_saw_error_locked, dns_ares_next_locked};
 
-static void dns_ares_shutdown_locked(grpc_exec_ctx* exec_ctx,
-                                     grpc_resolver* resolver) {
+static void dns_ares_shutdown_locked(grpc_resolver* resolver) {
   ares_dns_resolver* r = (ares_dns_resolver*)resolver;
   if (r->have_retry_timer) {
-    grpc_timer_cancel(exec_ctx, &r->retry_timer);
+    grpc_timer_cancel(&r->retry_timer);
   }
   if (r->pending_request != nullptr) {
-    grpc_cancel_ares_request(exec_ctx, r->pending_request);
+    grpc_cancel_ares_request(r->pending_request);
   }
   if (r->next_completion != nullptr) {
     *r->target_result = nullptr;
-    GRPC_CLOSURE_SCHED(
-        exec_ctx, r->next_completion,
-        GRPC_ERROR_CREATE_FROM_STATIC_STRING("Resolver Shutdown"));
+    GRPC_CLOSURE_SCHED(r->next_completion, GRPC_ERROR_CREATE_FROM_STATIC_STRING(
+                                               "Resolver Shutdown"));
     r->next_completion = nullptr;
   }
 }
 
-static void dns_ares_channel_saw_error_locked(grpc_exec_ctx* exec_ctx,
-                                              grpc_resolver* resolver) {
+static void dns_ares_channel_saw_error_locked(grpc_resolver* resolver) {
   ares_dns_resolver* r = (ares_dns_resolver*)resolver;
   if (!r->resolving) {
     grpc_backoff_reset(&r->backoff_state);
-    dns_ares_start_resolving_locked(exec_ctx, r);
+    dns_ares_start_resolving_locked(r);
   }
 }
 
-static void dns_ares_on_retry_timer_locked(grpc_exec_ctx* exec_ctx, void* arg,
-                                           grpc_error* error) {
+static void dns_ares_on_retry_timer_locked(void* arg, grpc_error* error) {
   ares_dns_resolver* r = (ares_dns_resolver*)arg;
   r->have_retry_timer = false;
   if (error == GRPC_ERROR_NONE) {
     if (!r->resolving) {
-      dns_ares_start_resolving_locked(exec_ctx, r);
+      dns_ares_start_resolving_locked(r);
     }
   }
-  GRPC_RESOLVER_UNREF(exec_ctx, &r->base, "retry-timer");
+  GRPC_RESOLVER_UNREF(&r->base, "retry-timer");
 }
 
 static bool value_in_json_array(grpc_json* array, const char* value) {
@@ -226,8 +219,7 @@ static char* choose_service_config(char* service_config_choice_json) {
   return service_config;
 }
 
-static void dns_ares_on_resolved_locked(grpc_exec_ctx* exec_ctx, void* arg,
-                                        grpc_error* error) {
+static void dns_ares_on_resolved_locked(void* arg, grpc_error* error) {
   ares_dns_resolver* r = (ares_dns_resolver*)arg;
   grpc_channel_args* result = nullptr;
   GPR_ASSERT(r->resolving);
@@ -268,13 +260,13 @@ static void dns_ares_on_resolved_locked(grpc_exec_ctx* exec_ctx, void* arg,
         num_args_to_add);
     if (service_config != nullptr) grpc_service_config_destroy(service_config);
     gpr_free(service_config_string);
-    grpc_lb_addresses_destroy(exec_ctx, r->lb_addresses);
+    grpc_lb_addresses_destroy(r->lb_addresses);
   } else {
     const char* msg = grpc_error_string(error);
     gpr_log(GPR_DEBUG, "dns resolution failed: %s", msg);
     grpc_millis next_try =
-        grpc_backoff_step(exec_ctx, &r->backoff_state).next_attempt_start_time;
-    grpc_millis timeout = next_try - grpc_exec_ctx_now(exec_ctx);
+        grpc_backoff_step(&r->backoff_state).next_attempt_start_time;
+    grpc_millis timeout = next_try - grpc_core::ExecCtx::Get()->Now();
     gpr_log(GPR_INFO, "dns resolution failed (will retry): %s",
             grpc_error_string(error));
     GPR_ASSERT(!r->have_retry_timer);
@@ -285,20 +277,19 @@ static void dns_ares_on_resolved_locked(grpc_exec_ctx* exec_ctx, void* arg,
     } else {
       gpr_log(GPR_DEBUG, "retrying immediately");
     }
-    grpc_timer_init(exec_ctx, &r->retry_timer, next_try,
+    grpc_timer_init(&r->retry_timer, next_try,
                     &r->dns_ares_on_retry_timer_locked);
   }
   if (r->resolved_result != nullptr) {
-    grpc_channel_args_destroy(exec_ctx, r->resolved_result);
+    grpc_channel_args_destroy(r->resolved_result);
   }
   r->resolved_result = result;
   r->resolved_version++;
-  dns_ares_maybe_finish_next_locked(exec_ctx, r);
-  GRPC_RESOLVER_UNREF(exec_ctx, &r->base, "dns-resolving");
+  dns_ares_maybe_finish_next_locked(r);
+  GRPC_RESOLVER_UNREF(&r->base, "dns-resolving");
 }
 
-static void dns_ares_next_locked(grpc_exec_ctx* exec_ctx,
-                                 grpc_resolver* resolver,
+static void dns_ares_next_locked(grpc_resolver* resolver,
                                  grpc_channel_args** target_result,
                                  grpc_closure* on_complete) {
   gpr_log(GPR_DEBUG, "dns_ares_next is called.");
@@ -308,56 +299,53 @@ static void dns_ares_next_locked(grpc_exec_ctx* exec_ctx,
   r->target_result = target_result;
   if (r->resolved_version == 0 && !r->resolving) {
     grpc_backoff_reset(&r->backoff_state);
-    dns_ares_start_resolving_locked(exec_ctx, r);
+    dns_ares_start_resolving_locked(r);
   } else {
-    dns_ares_maybe_finish_next_locked(exec_ctx, r);
+    dns_ares_maybe_finish_next_locked(r);
   }
 }
 
-static void dns_ares_start_resolving_locked(grpc_exec_ctx* exec_ctx,
-                                            ares_dns_resolver* r) {
+static void dns_ares_start_resolving_locked(ares_dns_resolver* r) {
   GRPC_RESOLVER_REF(&r->base, "dns-resolving");
   GPR_ASSERT(!r->resolving);
   r->resolving = true;
   r->lb_addresses = nullptr;
   r->service_config_json = nullptr;
   r->pending_request = grpc_dns_lookup_ares(
-      exec_ctx, r->dns_server, r->name_to_resolve, r->default_port,
-      r->interested_parties, &r->dns_ares_on_resolved_locked, &r->lb_addresses,
+      r->dns_server, r->name_to_resolve, r->default_port, r->interested_parties,
+      &r->dns_ares_on_resolved_locked, &r->lb_addresses,
       true /* check_grpclb */,
       r->request_service_config ? &r->service_config_json : nullptr);
 }
 
-static void dns_ares_maybe_finish_next_locked(grpc_exec_ctx* exec_ctx,
-                                              ares_dns_resolver* r) {
+static void dns_ares_maybe_finish_next_locked(ares_dns_resolver* r) {
   if (r->next_completion != nullptr &&
       r->resolved_version != r->published_version) {
     *r->target_result = r->resolved_result == nullptr
                             ? nullptr
                             : grpc_channel_args_copy(r->resolved_result);
     gpr_log(GPR_DEBUG, "dns_ares_maybe_finish_next_locked");
-    GRPC_CLOSURE_SCHED(exec_ctx, r->next_completion, GRPC_ERROR_NONE);
+    GRPC_CLOSURE_SCHED(r->next_completion, GRPC_ERROR_NONE);
     r->next_completion = nullptr;
     r->published_version = r->resolved_version;
   }
 }
 
-static void dns_ares_destroy(grpc_exec_ctx* exec_ctx, grpc_resolver* gr) {
+static void dns_ares_destroy(grpc_resolver* gr) {
   gpr_log(GPR_DEBUG, "dns_ares_destroy");
   ares_dns_resolver* r = (ares_dns_resolver*)gr;
   if (r->resolved_result != nullptr) {
-    grpc_channel_args_destroy(exec_ctx, r->resolved_result);
+    grpc_channel_args_destroy(r->resolved_result);
   }
-  grpc_pollset_set_destroy(exec_ctx, r->interested_parties);
+  grpc_pollset_set_destroy(r->interested_parties);
   gpr_free(r->dns_server);
   gpr_free(r->name_to_resolve);
   gpr_free(r->default_port);
-  grpc_channel_args_destroy(exec_ctx, r->channel_args);
+  grpc_channel_args_destroy(r->channel_args);
   gpr_free(r);
 }
 
-static grpc_resolver* dns_ares_create(grpc_exec_ctx* exec_ctx,
-                                      grpc_resolver_args* args,
+static grpc_resolver* dns_ares_create(grpc_resolver_args* args,
                                       const char* default_port) {
   /* Get name from args. */
   const char* path = args->uri->path;
@@ -378,8 +366,7 @@ static grpc_resolver* dns_ares_create(grpc_exec_ctx* exec_ctx,
       arg, (grpc_integer_options){false, false, true});
   r->interested_parties = grpc_pollset_set_create();
   if (args->pollset_set != nullptr) {
-    grpc_pollset_set_add_pollset_set(exec_ctx, r->interested_parties,
-                                     args->pollset_set);
+    grpc_pollset_set_add_pollset_set(r->interested_parties, args->pollset_set);
   }
   grpc_backoff_init(
       &r->backoff_state, GRPC_DNS_INITIAL_CONNECT_BACKOFF_SECONDS * 1000,
@@ -404,9 +391,8 @@ static void dns_ares_factory_ref(grpc_resolver_factory* factory) {}
 static void dns_ares_factory_unref(grpc_resolver_factory* factory) {}
 
 static grpc_resolver* dns_factory_create_resolver(
-    grpc_exec_ctx* exec_ctx, grpc_resolver_factory* factory,
-    grpc_resolver_args* args) {
-  return dns_ares_create(exec_ctx, args, "https");
+    grpc_resolver_factory* factory, grpc_resolver_args* args) {
+  return dns_ares_create(args, "https");
 }
 
 static char* dns_ares_factory_get_default_host_name(

src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_ev_driver.h

@@ -28,8 +28,7 @@ typedef struct grpc_ares_ev_driver grpc_ares_ev_driver;
 /* Start \a ev_driver. It will keep working until all IO on its ares_channel is
    done, or grpc_ares_ev_driver_destroy() is called. It may notify the callbacks
    bound to its ares_channel when necessary. */
-void grpc_ares_ev_driver_start(grpc_exec_ctx* exec_ctx,
-                               grpc_ares_ev_driver* ev_driver);
+void grpc_ares_ev_driver_start(grpc_ares_ev_driver* ev_driver);
 
 /* Returns the ares_channel owned by \a ev_driver. To bind a c-ares query to
    \a ev_driver, use the ares_channel owned by \a ev_driver as the arg of the
@@ -47,8 +46,7 @@ grpc_error* grpc_ares_ev_driver_create(grpc_ares_ev_driver** ev_driver,
 void grpc_ares_ev_driver_destroy(grpc_ares_ev_driver* ev_driver);
 
 /* Shutdown all the grpc_fds used by \a ev_driver */
-void grpc_ares_ev_driver_shutdown(grpc_exec_ctx* exec_ctx,
-                                  grpc_ares_ev_driver* ev_driver);
+void grpc_ares_ev_driver_shutdown(grpc_ares_ev_driver* ev_driver);
 
 #endif /* GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_RESOLVER_DNS_C_ARES_GRPC_ARES_EV_DRIVER_H \
         */

src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_ev_driver_posix.cc

@@ -77,8 +77,7 @@ struct grpc_ares_ev_driver {
   bool shutting_down;
 };
 
-static void grpc_ares_notify_on_event_locked(grpc_exec_ctx* exec_ctx,
-                                             grpc_ares_ev_driver* ev_driver);
+static void grpc_ares_notify_on_event_locked(grpc_ares_ev_driver* ev_driver);
 
 static grpc_ares_ev_driver* grpc_ares_ev_driver_ref(
     grpc_ares_ev_driver* ev_driver) {
@@ -98,7 +97,7 @@ static void grpc_ares_ev_driver_unref(grpc_ares_ev_driver* ev_driver) {
   }
 }
 
-static void fd_node_destroy(grpc_exec_ctx* exec_ctx, fd_node* fdn) {
+static void fd_node_destroy(fd_node* fdn) {
   gpr_log(GPR_DEBUG, "delete fd: %d", grpc_fd_wrapped_fd(fdn->fd));
   GPR_ASSERT(!fdn->readable_registered);
   GPR_ASSERT(!fdn->writable_registered);
@@ -106,21 +105,20 @@ static void fd_node_destroy(grpc_exec_ctx* exec_ctx, fd_node* fdn) {
   /* c-ares library has closed the fd inside grpc_fd. This fd may be picked up
      immediately by another thread, and should not be closed by the following
      grpc_fd_orphan. */
-  grpc_fd_orphan(exec_ctx, fdn->fd, nullptr, nullptr, true /* already_closed */,
+  grpc_fd_orphan(fdn->fd, nullptr, nullptr, true /* already_closed */,
                  "c-ares query finished");
   gpr_free(fdn);
 }
 
-static void fd_node_shutdown(grpc_exec_ctx* exec_ctx, fd_node* fdn) {
+static void fd_node_shutdown(fd_node* fdn) {
   gpr_mu_lock(&fdn->mu);
   fdn->shutting_down = true;
   if (!fdn->readable_registered && !fdn->writable_registered) {
     gpr_mu_unlock(&fdn->mu);
-    fd_node_destroy(exec_ctx, fdn);
+    fd_node_destroy(fdn);
   } else {
     grpc_fd_shutdown(
-        exec_ctx, fdn->fd,
-        GRPC_ERROR_CREATE_FROM_STATIC_STRING("c-ares fd shutdown"));
+        fdn->fd, GRPC_ERROR_CREATE_FROM_STATIC_STRING("c-ares fd shutdown"));
     gpr_mu_unlock(&fdn->mu);
   }
 }
@@ -160,15 +158,13 @@ void grpc_ares_ev_driver_destroy(grpc_ares_ev_driver* ev_driver) {
   grpc_ares_ev_driver_unref(ev_driver);
 }
 
-void grpc_ares_ev_driver_shutdown(grpc_exec_ctx* exec_ctx,
-                                  grpc_ares_ev_driver* ev_driver) {
+void grpc_ares_ev_driver_shutdown(grpc_ares_ev_driver* ev_driver) {
   gpr_mu_lock(&ev_driver->mu);
   ev_driver->shutting_down = true;
   fd_node* fn = ev_driver->fds;
   while (fn != nullptr) {
-    grpc_fd_shutdown(
-        exec_ctx, fn->fd,
-        GRPC_ERROR_CREATE_FROM_STATIC_STRING("grpc_ares_ev_driver_shutdown"));
+    grpc_fd_shutdown(fn->fd, GRPC_ERROR_CREATE_FROM_STATIC_STRING(
+                                 "grpc_ares_ev_driver_shutdown"));
     fn = fn->next;
   }
   gpr_mu_unlock(&ev_driver->mu);
@@ -199,8 +195,7 @@ static bool grpc_ares_is_fd_still_readable(grpc_ares_ev_driver* ev_driver,
   return ioctl(fd, FIONREAD, &bytes_available) == 0 && bytes_available > 0;
 }
 
-static void on_readable_cb(grpc_exec_ctx* exec_ctx, void* arg,
-                           grpc_error* error) {
+static void on_readable_cb(void* arg, grpc_error* error) {
   fd_node* fdn = (fd_node*)arg;
   grpc_ares_ev_driver* ev_driver = fdn->ev_driver;
   gpr_mu_lock(&fdn->mu);
@@ -208,7 +203,7 @@ static void on_readable_cb(grpc_exec_ctx* exec_ctx, void* arg,
   fdn->readable_registered = false;
   if (fdn->shutting_down && !fdn->writable_registered) {
     gpr_mu_unlock(&fdn->mu);
-    fd_node_destroy(exec_ctx, fdn);
+    fd_node_destroy(fdn);
     grpc_ares_ev_driver_unref(ev_driver);
     return;
   }
@@ -229,13 +224,12 @@ static void on_readable_cb(grpc_exec_ctx* exec_ctx, void* arg,
     ares_cancel(ev_driver->channel);
   }
   gpr_mu_lock(&ev_driver->mu);
-  grpc_ares_notify_on_event_locked(exec_ctx, ev_driver);
+  grpc_ares_notify_on_event_locked(ev_driver);
   gpr_mu_unlock(&ev_driver->mu);
   grpc_ares_ev_driver_unref(ev_driver);
 }
 
-static void on_writable_cb(grpc_exec_ctx* exec_ctx, void* arg,
-                           grpc_error* error) {
+static void on_writable_cb(void* arg, grpc_error* error) {
   fd_node* fdn = (fd_node*)arg;
   grpc_ares_ev_driver* ev_driver = fdn->ev_driver;
   gpr_mu_lock(&fdn->mu);
@@ -243,7 +237,7 @@ static void on_writable_cb(grpc_exec_ctx* exec_ctx, void* arg,
   fdn->writable_registered = false;
   if (fdn->shutting_down && !fdn->readable_registered) {
     gpr_mu_unlock(&fdn->mu);
-    fd_node_destroy(exec_ctx, fdn);
+    fd_node_destroy(fdn);
     grpc_ares_ev_driver_unref(ev_driver);
     return;
   }
@@ -262,7 +256,7 @@ static void on_writable_cb(grpc_exec_ctx* exec_ctx, void* arg,
     ares_cancel(ev_driver->channel);
   }
   gpr_mu_lock(&ev_driver->mu);
-  grpc_ares_notify_on_event_locked(exec_ctx, ev_driver);
+  grpc_ares_notify_on_event_locked(ev_driver);
   gpr_mu_unlock(&ev_driver->mu);
   grpc_ares_ev_driver_unref(ev_driver);
 }
@@ -273,8 +267,7 @@ ares_channel* grpc_ares_ev_driver_get_channel(grpc_ares_ev_driver* ev_driver) {
 
 // Get the file descriptors used by the ev_driver's ares channel, register
 // driver_closure with these filedescriptors.
-static void grpc_ares_notify_on_event_locked(grpc_exec_ctx* exec_ctx,
-                                             grpc_ares_ev_driver* ev_driver) {
+static void grpc_ares_notify_on_event_locked(grpc_ares_ev_driver* ev_driver) {
   fd_node* new_list = nullptr;
   if (!ev_driver->shutting_down) {
     ares_socket_t socks[ARES_GETSOCK_MAXNUM];
@@ -300,7 +293,7 @@ static void grpc_ares_notify_on_event_locked(grpc_exec_ctx* exec_ctx,
                             grpc_schedule_on_exec_ctx);
           GRPC_CLOSURE_INIT(&fdn->write_closure, on_writable_cb, fdn,
                             grpc_schedule_on_exec_ctx);
-          grpc_pollset_set_add_fd(exec_ctx, ev_driver->pollset_set, fdn->fd);
+          grpc_pollset_set_add_fd(ev_driver->pollset_set, fdn->fd);
           gpr_free(fd_name);
         }
         fdn->next = new_list;
@@ -312,7 +305,7 @@ static void grpc_ares_notify_on_event_locked(grpc_exec_ctx* exec_ctx,
             !fdn->readable_registered) {
           grpc_ares_ev_driver_ref(ev_driver);
           gpr_log(GPR_DEBUG, "notify read on: %d", grpc_fd_wrapped_fd(fdn->fd));
-          grpc_fd_notify_on_read(exec_ctx, fdn->fd, &fdn->read_closure);
+          grpc_fd_notify_on_read(fdn->fd, &fdn->read_closure);
           fdn->readable_registered = true;
         }
         // Register write_closure if the socket is writable and write_closure
@@ -322,7 +315,7 @@ static void grpc_ares_notify_on_event_locked(grpc_exec_ctx* exec_ctx,
           gpr_log(GPR_DEBUG, "notify write on: %d",
                   grpc_fd_wrapped_fd(fdn->fd));
           grpc_ares_ev_driver_ref(ev_driver);
-          grpc_fd_notify_on_write(exec_ctx, fdn->fd, &fdn->write_closure);
+          grpc_fd_notify_on_write(fdn->fd, &fdn->write_closure);
           fdn->writable_registered = true;
         }
         gpr_mu_unlock(&fdn->mu);
@@ -335,7 +328,7 @@ static void grpc_ares_notify_on_event_locked(grpc_exec_ctx* exec_ctx,
   while (ev_driver->fds != nullptr) {
     fd_node* cur = ev_driver->fds;
     ev_driver->fds = ev_driver->fds->next;
-    fd_node_shutdown(exec_ctx, cur);
+    fd_node_shutdown(cur);
   }
   ev_driver->fds = new_list;
   // If the ev driver has no working fd, all the tasks are done.
@@ -345,12 +338,11 @@ static void grpc_ares_notify_on_event_locked(grpc_exec_ctx* exec_ctx,
   }
 }
 
-void grpc_ares_ev_driver_start(grpc_exec_ctx* exec_ctx,
-                               grpc_ares_ev_driver* ev_driver) {
+void grpc_ares_ev_driver_start(grpc_ares_ev_driver* ev_driver) {
   gpr_mu_lock(&ev_driver->mu);
   if (!ev_driver->working) {
     ev_driver->working = true;
-    grpc_ares_notify_on_event_locked(exec_ctx, ev_driver);
+    grpc_ares_notify_on_event_locked(ev_driver);
   }
   gpr_mu_unlock(&ev_driver->mu);
 }

src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.cc

@@ -96,24 +96,12 @@ static void grpc_ares_request_ref(grpc_ares_request* r) {
   gpr_ref(&r->pending_queries);
 }
 
-static void grpc_ares_request_unref(grpc_exec_ctx* exec_ctx,
-                                    grpc_ares_request* r) {
+static void grpc_ares_request_unref(grpc_ares_request* r) {
   /* If there are no pending queries, invoke on_done callback and destroy the
      request */
   if (gpr_unref(&r->pending_queries)) {
     /* TODO(zyc): Sort results with RFC6724 before invoking on_done. */
-    if (exec_ctx == nullptr) {
-      /* A new exec_ctx is created here, as the c-ares interface does not
-         provide one in ares_host_callback. It's safe to schedule on_done with
-         the newly created exec_ctx, since the caller has been warned not to
-         acquire locks in on_done. ares_dns_resolver is using combiner to
-         protect resources needed by on_done. */
-      grpc_exec_ctx new_exec_ctx = GRPC_EXEC_CTX_INIT;
-      GRPC_CLOSURE_SCHED(&new_exec_ctx, r->on_done, r->error);
-      grpc_exec_ctx_finish(&new_exec_ctx);
-    } else {
-      GRPC_CLOSURE_SCHED(exec_ctx, r->on_done, r->error);
-    }
+    GRPC_CLOSURE_SCHED(r->on_done, r->error);
     gpr_mu_destroy(&r->mu);
     grpc_ares_ev_driver_destroy(r->ev_driver);
     gpr_free(r);
@@ -133,9 +121,8 @@ static grpc_ares_hostbyname_request* create_hostbyname_request(
   return hr;
 }
 
-static void destroy_hostbyname_request(grpc_exec_ctx* exec_ctx,
-                                       grpc_ares_hostbyname_request* hr) {
-  grpc_ares_request_unref(exec_ctx, hr->parent_request);
+static void destroy_hostbyname_request(grpc_ares_hostbyname_request* hr) {
+  grpc_ares_request_unref(hr->parent_request);
   gpr_free(hr->host);
   gpr_free(hr);
 }
@@ -220,13 +207,13 @@ static void on_hostbyname_done_cb(void* arg, int status, int timeouts,
     }
   }
   gpr_mu_unlock(&r->mu);
-  destroy_hostbyname_request(nullptr, hr);
+  destroy_hostbyname_request(hr);
 }
 
 static void on_srv_query_done_cb(void* arg, int status, int timeouts,
                                  unsigned char* abuf, int alen) {
   grpc_ares_request* r = (grpc_ares_request*)arg;
-  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+  grpc_core::ExecCtx exec_ctx;
   gpr_log(GPR_DEBUG, "on_query_srv_done_cb");
   if (status == ARES_SUCCESS) {
     gpr_log(GPR_DEBUG, "on_query_srv_done_cb ARES_SUCCESS");
@@ -246,7 +233,7 @@ static void on_srv_query_done_cb(void* arg, int status, int timeouts,
             r, srv_it->host, htons(srv_it->port), true /* is_balancer */);
         ares_gethostbyname(*channel, hr->host, AF_INET, on_hostbyname_done_cb,
                            hr);
-        grpc_ares_ev_driver_start(&exec_ctx, r->ev_driver);
+        grpc_ares_ev_driver_start(r->ev_driver);
       }
     }
     if (reply != nullptr) {
@@ -264,8 +251,7 @@ static void on_srv_query_done_cb(void* arg, int status, int timeouts,
       r->error = grpc_error_add_child(error, r->error);
     }
   }
-  grpc_ares_request_unref(&exec_ctx, r);
-  grpc_exec_ctx_finish(&exec_ctx);
+  grpc_ares_request_unref(r);
 }
 
 static const char g_service_config_attribute_prefix[] = "grpc_config=";
@@ -323,14 +309,13 @@ fail:
   }
 done:
   gpr_mu_unlock(&r->mu);
-  grpc_ares_request_unref(nullptr, r);
+  grpc_ares_request_unref(r);
 }
 
 static grpc_ares_request* grpc_dns_lookup_ares_impl(
-    grpc_exec_ctx* exec_ctx, const char* dns_server, const char* name,
-    const char* default_port, grpc_pollset_set* interested_parties,
-    grpc_closure* on_done, grpc_lb_addresses** addrs, bool check_grpclb,
-    char** service_config_json) {
+    const char* dns_server, const char* name, const char* default_port,
+    grpc_pollset_set* interested_parties, grpc_closure* on_done,
+    grpc_lb_addresses** addrs, bool check_grpclb, char** service_config_json) {
   grpc_error* error = GRPC_ERROR_NONE;
   grpc_ares_hostbyname_request* hr = nullptr;
   grpc_ares_request* r = nullptr;
@@ -437,28 +422,28 @@ static grpc_ares_request* grpc_dns_lookup_ares_impl(
     gpr_free(config_name);
   }
   /* TODO(zyc): Handle CNAME records here. */
-  grpc_ares_ev_driver_start(exec_ctx, r->ev_driver);
-  grpc_ares_request_unref(exec_ctx, r);
+  grpc_ares_ev_driver_start(r->ev_driver);
+  grpc_ares_request_unref(r);
   gpr_free(host);
   gpr_free(port);
   return r;
 
 error_cleanup:
-  GRPC_CLOSURE_SCHED(exec_ctx, on_done, error);
+  GRPC_CLOSURE_SCHED(on_done, error);
   gpr_free(host);
   gpr_free(port);
   return nullptr;
 }
 
 grpc_ares_request* (*grpc_dns_lookup_ares)(
-    grpc_exec_ctx* exec_ctx, const char* dns_server, const char* name,
-    const char* default_port, grpc_pollset_set* interested_parties,
-    grpc_closure* on_done, grpc_lb_addresses** addrs, bool check_grpclb,
+    const char* dns_server, const char* name, const char* default_port,
+    grpc_pollset_set* interested_parties, grpc_closure* on_done,
+    grpc_lb_addresses** addrs, bool check_grpclb,
     char** service_config_json) = grpc_dns_lookup_ares_impl;
 
-void grpc_cancel_ares_request(grpc_exec_ctx* exec_ctx, grpc_ares_request* r) {
+void grpc_cancel_ares_request(grpc_ares_request* r) {
   if (grpc_dns_lookup_ares == grpc_dns_lookup_ares_impl) {
-    grpc_ares_ev_driver_shutdown(exec_ctx, r->ev_driver);
+    grpc_ares_ev_driver_shutdown(r->ev_driver);
   }
 }
 
@@ -501,8 +486,7 @@ typedef struct grpc_resolve_address_ares_request {
   grpc_closure on_dns_lookup_done;
 } grpc_resolve_address_ares_request;
 
-static void on_dns_lookup_done_cb(grpc_exec_ctx* exec_ctx, void* arg,
-                                  grpc_error* error) {
+static void on_dns_lookup_done_cb(void* arg, grpc_error* error) {
   grpc_resolve_address_ares_request* r =
       (grpc_resolve_address_ares_request*)arg;
   grpc_resolved_addresses** resolved_addresses = r->addrs_out;
@@ -520,14 +504,12 @@ static void on_dns_lookup_done_cb(grpc_exec_ctx* exec_ctx, void* arg,
              &r->lb_addrs->addresses[i].address, sizeof(grpc_resolved_address));
     }
   }
-  GRPC_CLOSURE_SCHED(exec_ctx, r->on_resolve_address_done,
-                     GRPC_ERROR_REF(error));
-  grpc_lb_addresses_destroy(exec_ctx, r->lb_addrs);
+  GRPC_CLOSURE_SCHED(r->on_resolve_address_done, GRPC_ERROR_REF(error));
+  grpc_lb_addresses_destroy(r->lb_addrs);
   gpr_free(r);
 }
 
-static void grpc_resolve_address_ares_impl(grpc_exec_ctx* exec_ctx,
-                                           const char* name,
+static void grpc_resolve_address_ares_impl(const char* name,
                                            const char* default_port,
                                            grpc_pollset_set* interested_parties,
                                            grpc_closure* on_done,
@@ -539,14 +521,14 @@ static void grpc_resolve_address_ares_impl(grpc_exec_ctx* exec_ctx,
   r->on_resolve_address_done = on_done;
   GRPC_CLOSURE_INIT(&r->on_dns_lookup_done, on_dns_lookup_done_cb, r,
                     grpc_schedule_on_exec_ctx);
-  grpc_dns_lookup_ares(exec_ctx, nullptr /* dns_server */, name, default_port,
+  grpc_dns_lookup_ares(nullptr /* dns_server */, name, default_port,
                        interested_parties, &r->on_dns_lookup_done, &r->lb_addrs,
                        false /* check_grpclb */,
                        nullptr /* service_config_json */);
 }
 
 void (*grpc_resolve_address_ares)(
-    grpc_exec_ctx* exec_ctx, const char* name, const char* default_port,
+    const char* name, const char* default_port,
     grpc_pollset_set* interested_parties, grpc_closure* on_done,
     grpc_resolved_addresses** addrs) = grpc_resolve_address_ares_impl;
 

src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.h

@@ -32,8 +32,7 @@ typedef struct grpc_ares_request grpc_ares_request;
    must be called at least once before this function. \a on_done may be
    called directly in this function without being scheduled with \a exec_ctx,
    so it must not try to acquire locks that are being held by the caller. */
-extern void (*grpc_resolve_address_ares)(grpc_exec_ctx* exec_ctx,
-                                         const char* name,
+extern void (*grpc_resolve_address_ares)(const char* name,
                                          const char* default_port,
                                          grpc_pollset_set* interested_parties,
                                          grpc_closure* on_done,
@@ -47,14 +46,13 @@ extern void (*grpc_resolve_address_ares)(grpc_exec_ctx* exec_ctx,
   scheduled with \a exec_ctx, so it must not try to acquire locks that are
   being held by the caller. */
 extern grpc_ares_request* (*grpc_dns_lookup_ares)(
-    grpc_exec_ctx* exec_ctx, const char* dns_server, const char* name,
-    const char* default_port, grpc_pollset_set* interested_parties,
-    grpc_closure* on_done, grpc_lb_addresses** addresses, bool check_grpclb,
+    const char* dns_server, const char* name, const char* default_port,
+    grpc_pollset_set* interested_parties, grpc_closure* on_done,
+    grpc_lb_addresses** addresses, bool check_grpclb,
     char** service_config_json);
 
 /* Cancel the pending grpc_ares_request \a request */
-void grpc_cancel_ares_request(grpc_exec_ctx* exec_ctx,
-                              grpc_ares_request* request);
+void grpc_cancel_ares_request(grpc_ares_request* request);
 
 /* Initialize gRPC ares wrapper. Must be called at least once before
    grpc_resolve_address_ares(). */

src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper_fallback.cc

@@ -26,34 +26,32 @@ struct grpc_ares_request {
 };
 
 static grpc_ares_request* grpc_dns_lookup_ares_impl(
-    grpc_exec_ctx* exec_ctx, const char* dns_server, const char* name,
-    const char* default_port, grpc_pollset_set* interested_parties,
-    grpc_closure* on_done, grpc_lb_addresses** addrs, bool check_grpclb,
-    char** service_config_json) {
+    const char* dns_server, const char* name, const char* default_port,
+    grpc_pollset_set* interested_parties, grpc_closure* on_done,
+    grpc_lb_addresses** addrs, bool check_grpclb, char** service_config_json) {
   return NULL;
 }
 
 grpc_ares_request* (*grpc_dns_lookup_ares)(
-    grpc_exec_ctx* exec_ctx, const char* dns_server, const char* name,
-    const char* default_port, grpc_pollset_set* interested_parties,
-    grpc_closure* on_done, grpc_lb_addresses** addrs, bool check_grpclb,
+    const char* dns_server, const char* name, const char* default_port,
+    grpc_pollset_set* interested_parties, grpc_closure* on_done,
+    grpc_lb_addresses** addrs, bool check_grpclb,
     char** service_config_json) = grpc_dns_lookup_ares_impl;
 
-void grpc_cancel_ares_request(grpc_exec_ctx* exec_ctx, grpc_ares_request* r) {}
+void grpc_cancel_ares_request(grpc_ares_request* r) {}
 
 grpc_error* grpc_ares_init(void) { return GRPC_ERROR_NONE; }
 
 void grpc_ares_cleanup(void) {}
 
-static void grpc_resolve_address_ares_impl(grpc_exec_ctx* exec_ctx,
-                                           const char* name,
+static void grpc_resolve_address_ares_impl(const char* name,
                                            const char* default_port,
                                            grpc_pollset_set* interested_parties,
                                            grpc_closure* on_done,
                                            grpc_resolved_addresses** addrs) {}
 
 void (*grpc_resolve_address_ares)(
-    grpc_exec_ctx* exec_ctx, const char* name, const char* default_port,
+    const char* name, const char* default_port,
     grpc_pollset_set* interested_parties, grpc_closure* on_done,
     grpc_resolved_addresses** addrs) = grpc_resolve_address_ares_impl;
 

src/core/ext/filters/client_channel/resolver/dns/native/dns_resolver.cc

@@ -76,49 +76,42 @@ typedef struct {
   grpc_resolved_addresses* addresses;
 } dns_resolver;
 
-static void dns_destroy(grpc_exec_ctx* exec_ctx, grpc_resolver* r);
+static void dns_destroy(grpc_resolver* r);
 
-static void dns_start_resolving_locked(grpc_exec_ctx* exec_ctx,
-                                       dns_resolver* r);
-static void dns_maybe_finish_next_locked(grpc_exec_ctx* exec_ctx,
-                                         dns_resolver* r);
+static void dns_start_resolving_locked(dns_resolver* r);
+static void dns_maybe_finish_next_locked(dns_resolver* r);
 
-static void dns_shutdown_locked(grpc_exec_ctx* exec_ctx, grpc_resolver* r);
-static void dns_channel_saw_error_locked(grpc_exec_ctx* exec_ctx,
-                                         grpc_resolver* r);
-static void dns_next_locked(grpc_exec_ctx* exec_ctx, grpc_resolver* r,
-                            grpc_channel_args** target_result,
+static void dns_shutdown_locked(grpc_resolver* r);
+static void dns_channel_saw_error_locked(grpc_resolver* r);
+static void dns_next_locked(grpc_resolver* r, grpc_channel_args** target_result,
                             grpc_closure* on_complete);
 
 static const grpc_resolver_vtable dns_resolver_vtable = {
     dns_destroy, dns_shutdown_locked, dns_channel_saw_error_locked,
     dns_next_locked};
 
-static void dns_shutdown_locked(grpc_exec_ctx* exec_ctx,
-                                grpc_resolver* resolver) {
+static void dns_shutdown_locked(grpc_resolver* resolver) {
   dns_resolver* r = (dns_resolver*)resolver;
   if (r->have_retry_timer) {
-    grpc_timer_cancel(exec_ctx, &r->retry_timer);
+    grpc_timer_cancel(&r->retry_timer);
   }
   if (r->next_completion != nullptr) {
     *r->target_result = nullptr;
-    GRPC_CLOSURE_SCHED(
-        exec_ctx, r->next_completion,
-        GRPC_ERROR_CREATE_FROM_STATIC_STRING("Resolver Shutdown"));
+    GRPC_CLOSURE_SCHED(r->next_completion, GRPC_ERROR_CREATE_FROM_STATIC_STRING(
+                                               "Resolver Shutdown"));
     r->next_completion = nullptr;
   }
 }
 
-static void dns_channel_saw_error_locked(grpc_exec_ctx* exec_ctx,
-                                         grpc_resolver* resolver) {
+static void dns_channel_saw_error_locked(grpc_resolver* resolver) {
   dns_resolver* r = (dns_resolver*)resolver;
   if (!r->resolving) {
     grpc_backoff_reset(&r->backoff_state);
-    dns_start_resolving_locked(exec_ctx, r);
+    dns_start_resolving_locked(r);
   }
 }
 
-static void dns_next_locked(grpc_exec_ctx* exec_ctx, grpc_resolver* resolver,
+static void dns_next_locked(grpc_resolver* resolver,
                             grpc_channel_args** target_result,
                             grpc_closure* on_complete) {
   dns_resolver* r = (dns_resolver*)resolver;
@@ -127,28 +120,26 @@ static void dns_next_locked(grpc_exec_ctx* exec_ctx, grpc_resolver* resolver,
   r->target_result = target_result;
   if (r->resolved_version == 0 && !r->resolving) {
     grpc_backoff_reset(&r->backoff_state);
-    dns_start_resolving_locked(exec_ctx, r);
+    dns_start_resolving_locked(r);
   } else {
-    dns_maybe_finish_next_locked(exec_ctx, r);
+    dns_maybe_finish_next_locked(r);
   }
 }
 
-static void dns_on_retry_timer_locked(grpc_exec_ctx* exec_ctx, void* arg,
-                                      grpc_error* error) {
+static void dns_on_retry_timer_locked(void* arg, grpc_error* error) {
   dns_resolver* r = (dns_resolver*)arg;
 
   r->have_retry_timer = false;
   if (error == GRPC_ERROR_NONE) {
     if (!r->resolving) {
-      dns_start_resolving_locked(exec_ctx, r);
+      dns_start_resolving_locked(r);
     }
   }
 
-  GRPC_RESOLVER_UNREF(exec_ctx, &r->base, "retry-timer");
+  GRPC_RESOLVER_UNREF(&r->base, "retry-timer");
 }
 
-static void dns_on_resolved_locked(grpc_exec_ctx* exec_ctx, void* arg,
-                                   grpc_error* error) {
+static void dns_on_resolved_locked(void* arg, grpc_error* error) {
   dns_resolver* r = (dns_resolver*)arg;
   grpc_channel_args* result = nullptr;
   GPR_ASSERT(r->resolving);
@@ -168,11 +159,11 @@ static void dns_on_resolved_locked(grpc_exec_ctx* exec_ctx, void* arg,
     grpc_arg new_arg = grpc_lb_addresses_create_channel_arg(addresses);
     result = grpc_channel_args_copy_and_add(r->channel_args, &new_arg, 1);
     grpc_resolved_addresses_destroy(r->addresses);
-    grpc_lb_addresses_destroy(exec_ctx, addresses);
+    grpc_lb_addresses_destroy(addresses);
   } else {
     grpc_millis next_try =
-        grpc_backoff_step(exec_ctx, &r->backoff_state).next_attempt_start_time;
-    grpc_millis timeout = next_try - grpc_exec_ctx_now(exec_ctx);
+        grpc_backoff_step(&r->backoff_state).next_attempt_start_time;
+    grpc_millis timeout = next_try - grpc_core::ExecCtx::Get()->Now();
     gpr_log(GPR_INFO, "dns resolution failed (will retry): %s",
             grpc_error_string(error));
     GPR_ASSERT(!r->have_retry_timer);
@@ -185,59 +176,56 @@ static void dns_on_resolved_locked(grpc_exec_ctx* exec_ctx, void* arg,
     }
     GRPC_CLOSURE_INIT(&r->on_retry, dns_on_retry_timer_locked, r,
                       grpc_combiner_scheduler(r->base.combiner));
-    grpc_timer_init(exec_ctx, &r->retry_timer, next_try, &r->on_retry);
+    grpc_timer_init(&r->retry_timer, next_try, &r->on_retry);
   }
   if (r->resolved_result != nullptr) {
-    grpc_channel_args_destroy(exec_ctx, r->resolved_result);
+    grpc_channel_args_destroy(r->resolved_result);
   }
   r->resolved_result = result;
   r->resolved_version++;
-  dns_maybe_finish_next_locked(exec_ctx, r);
+  dns_maybe_finish_next_locked(r);
   GRPC_ERROR_UNREF(error);
 
-  GRPC_RESOLVER_UNREF(exec_ctx, &r->base, "dns-resolving");
+  GRPC_RESOLVER_UNREF(&r->base, "dns-resolving");
 }
 
-static void dns_start_resolving_locked(grpc_exec_ctx* exec_ctx,
-                                       dns_resolver* r) {
+static void dns_start_resolving_locked(dns_resolver* r) {
   GRPC_RESOLVER_REF(&r->base, "dns-resolving");
   GPR_ASSERT(!r->resolving);
   r->resolving = true;
   r->addresses = nullptr;
   grpc_resolve_address(
-      exec_ctx, r->name_to_resolve, r->default_port, r->interested_parties,
+      r->name_to_resolve, r->default_port, r->interested_parties,
       GRPC_CLOSURE_CREATE(dns_on_resolved_locked, r,
                           grpc_combiner_scheduler(r->base.combiner)),
       &r->addresses);
 }
 
-static void dns_maybe_finish_next_locked(grpc_exec_ctx* exec_ctx,
-                                         dns_resolver* r) {
+static void dns_maybe_finish_next_locked(dns_resolver* r) {
   if (r->next_completion != nullptr &&
       r->resolved_version != r->published_version) {
     *r->target_result = r->resolved_result == nullptr
                             ? nullptr
                             : grpc_channel_args_copy(r->resolved_result);
-    GRPC_CLOSURE_SCHED(exec_ctx, r->next_completion, GRPC_ERROR_NONE);
+    GRPC_CLOSURE_SCHED(r->next_completion, GRPC_ERROR_NONE);
     r->next_completion = nullptr;
     r->published_version = r->resolved_version;
   }
 }
 
-static void dns_destroy(grpc_exec_ctx* exec_ctx, grpc_resolver* gr) {
+static void dns_destroy(grpc_resolver* gr) {
   dns_resolver* r = (dns_resolver*)gr;
   if (r->resolved_result != nullptr) {
-    grpc_channel_args_destroy(exec_ctx, r->resolved_result);
+    grpc_channel_args_destroy(r->resolved_result);
   }
-  grpc_pollset_set_destroy(exec_ctx, r->interested_parties);
+  grpc_pollset_set_destroy(r->interested_parties);
   gpr_free(r->name_to_resolve);
   gpr_free(r->default_port);
-  grpc_channel_args_destroy(exec_ctx, r->channel_args);
+  grpc_channel_args_destroy(r->channel_args);
   gpr_free(r);
 }
 
-static grpc_resolver* dns_create(grpc_exec_ctx* exec_ctx,
-                                 grpc_resolver_args* args,
+static grpc_resolver* dns_create(grpc_resolver_args* args,
                                  const char* default_port) {
   if (0 != strcmp(args->uri->authority, "")) {
     gpr_log(GPR_ERROR, "authority based dns uri's not supported");
@@ -254,8 +242,7 @@ static grpc_resolver* dns_create(grpc_exec_ctx* exec_ctx,
   r->channel_args = grpc_channel_args_copy(args->args);
   r->interested_parties = grpc_pollset_set_create();
   if (args->pollset_set != nullptr) {
-    grpc_pollset_set_add_pollset_set(exec_ctx, r->interested_parties,
-                                     args->pollset_set);
+    grpc_pollset_set_add_pollset_set(r->interested_parties, args->pollset_set);
   }
   grpc_backoff_init(
       &r->backoff_state, GRPC_DNS_INITIAL_CONNECT_BACKOFF_SECONDS * 1000,
@@ -274,9 +261,8 @@ static void dns_factory_ref(grpc_resolver_factory* factory) {}
 static void dns_factory_unref(grpc_resolver_factory* factory) {}
 
 static grpc_resolver* dns_factory_create_resolver(
-    grpc_exec_ctx* exec_ctx, grpc_resolver_factory* factory,
-    grpc_resolver_args* args) {
-  return dns_create(exec_ctx, args, "https");
+    grpc_resolver_factory* factory, grpc_resolver_args* args) {
+  return dns_create(args, "https");
 }
 
 static char* dns_factory_get_default_host_name(grpc_resolver_factory* factory,

src/core/ext/filters/client_channel/resolver/fake/fake_resolver.cc

@@ -67,57 +67,52 @@ typedef struct {
   grpc_channel_args** target_result;
 } fake_resolver;
 
-static void fake_resolver_destroy(grpc_exec_ctx* exec_ctx, grpc_resolver* gr) {
+static void fake_resolver_destroy(grpc_resolver* gr) {
   fake_resolver* r = (fake_resolver*)gr;
-  grpc_channel_args_destroy(exec_ctx, r->next_results);
-  grpc_channel_args_destroy(exec_ctx, r->results_upon_error);
-  grpc_channel_args_destroy(exec_ctx, r->channel_args);
+  grpc_channel_args_destroy(r->next_results);
+  grpc_channel_args_destroy(r->results_upon_error);
+  grpc_channel_args_destroy(r->channel_args);
   gpr_free(r);
 }
 
-static void fake_resolver_shutdown_locked(grpc_exec_ctx* exec_ctx,
-                                          grpc_resolver* resolver) {
+static void fake_resolver_shutdown_locked(grpc_resolver* resolver) {
   fake_resolver* r = (fake_resolver*)resolver;
   if (r->next_completion != nullptr) {
     *r->target_result = nullptr;
-    GRPC_CLOSURE_SCHED(
-        exec_ctx, r->next_completion,
-        GRPC_ERROR_CREATE_FROM_STATIC_STRING("Resolver Shutdown"));
+    GRPC_CLOSURE_SCHED(r->next_completion, GRPC_ERROR_CREATE_FROM_STATIC_STRING(
+                                               "Resolver Shutdown"));
     r->next_completion = nullptr;
   }
 }
 
-static void fake_resolver_maybe_finish_next_locked(grpc_exec_ctx* exec_ctx,
-                                                   fake_resolver* r) {
+static void fake_resolver_maybe_finish_next_locked(fake_resolver* r) {
   if (r->next_completion != nullptr && r->next_results != nullptr) {
     *r->target_result =
         grpc_channel_args_union(r->next_results, r->channel_args);
-    grpc_channel_args_destroy(exec_ctx, r->next_results);
+    grpc_channel_args_destroy(r->next_results);
     r->next_results = nullptr;
-    GRPC_CLOSURE_SCHED(exec_ctx, r->next_completion, GRPC_ERROR_NONE);
+    GRPC_CLOSURE_SCHED(r->next_completion, GRPC_ERROR_NONE);
     r->next_completion = nullptr;
   }
 }
 
-static void fake_resolver_channel_saw_error_locked(grpc_exec_ctx* exec_ctx,
-                                                   grpc_resolver* resolver) {
+static void fake_resolver_channel_saw_error_locked(grpc_resolver* resolver) {
   fake_resolver* r = (fake_resolver*)resolver;
   if (r->next_results == nullptr && r->results_upon_error != nullptr) {
     // Pretend we re-resolved.
     r->next_results = grpc_channel_args_copy(r->results_upon_error);
   }
-  fake_resolver_maybe_finish_next_locked(exec_ctx, r);
+  fake_resolver_maybe_finish_next_locked(r);
 }
 
-static void fake_resolver_next_locked(grpc_exec_ctx* exec_ctx,
-                                      grpc_resolver* resolver,
+static void fake_resolver_next_locked(grpc_resolver* resolver,
                                       grpc_channel_args** target_result,
                                       grpc_closure* on_complete) {
   fake_resolver* r = (fake_resolver*)resolver;
   GPR_ASSERT(!r->next_completion);
   r->next_completion = on_complete;
   r->target_result = target_result;
-  fake_resolver_maybe_finish_next_locked(exec_ctx, r);
+  fake_resolver_maybe_finish_next_locked(r);
 }
 
 static const grpc_resolver_vtable fake_resolver_vtable = {
@@ -157,33 +152,31 @@ typedef struct set_response_closure_arg {
   grpc_channel_args* next_response;
 } set_response_closure_arg;
 
-static void set_response_closure_fn(grpc_exec_ctx* exec_ctx, void* arg,
-                                    grpc_error* error) {
+static void set_response_closure_fn(void* arg, grpc_error* error) {
   set_response_closure_arg* closure_arg = (set_response_closure_arg*)arg;
   grpc_fake_resolver_response_generator* generator = closure_arg->generator;
   fake_resolver* r = generator->resolver;
   if (r->next_results != nullptr) {
-    grpc_channel_args_destroy(exec_ctx, r->next_results);
+    grpc_channel_args_destroy(r->next_results);
   }
   r->next_results = closure_arg->next_response;
   if (r->results_upon_error != nullptr) {
-    grpc_channel_args_destroy(exec_ctx, r->results_upon_error);
+    grpc_channel_args_destroy(r->results_upon_error);
   }
   r->results_upon_error = grpc_channel_args_copy(closure_arg->next_response);
   gpr_free(closure_arg);
-  fake_resolver_maybe_finish_next_locked(exec_ctx, r);
+  fake_resolver_maybe_finish_next_locked(r);
 }
 
 void grpc_fake_resolver_response_generator_set_response(
-    grpc_exec_ctx* exec_ctx, grpc_fake_resolver_response_generator* generator,
+    grpc_fake_resolver_response_generator* generator,
     grpc_channel_args* next_response) {
   GPR_ASSERT(generator->resolver != nullptr);
   set_response_closure_arg* closure_arg =
       (set_response_closure_arg*)gpr_zalloc(sizeof(*closure_arg));
   closure_arg->generator = generator;
   closure_arg->next_response = grpc_channel_args_copy(next_response);
-  GRPC_CLOSURE_SCHED(exec_ctx,
-                     GRPC_CLOSURE_INIT(&closure_arg->set_response_closure,
+  GRPC_CLOSURE_SCHED(GRPC_CLOSURE_INIT(&closure_arg->set_response_closure,
                                        set_response_closure_fn, closure_arg,
                                        grpc_combiner_scheduler(
                                            generator->resolver->base.combiner)),
@@ -195,7 +188,7 @@ static void* response_generator_arg_copy(void* p) {
       (grpc_fake_resolver_response_generator*)p);
 }
 
-static void response_generator_arg_destroy(grpc_exec_ctx* exec_ctx, void* p) {
+static void response_generator_arg_destroy(void* p) {
   grpc_fake_resolver_response_generator_unref(
       (grpc_fake_resolver_response_generator*)p);
 }
@@ -232,8 +225,7 @@ static void fake_resolver_factory_ref(grpc_resolver_factory* factory) {}
 
 static void fake_resolver_factory_unref(grpc_resolver_factory* factory) {}
 
-static grpc_resolver* fake_resolver_create(grpc_exec_ctx* exec_ctx,
-                                           grpc_resolver_factory* factory,
+static grpc_resolver* fake_resolver_create(grpc_resolver_factory* factory,
                                            grpc_resolver_args* args) {
   fake_resolver* r = (fake_resolver*)gpr_zalloc(sizeof(*r));
   r->channel_args = grpc_channel_args_copy(args->args);

src/core/ext/filters/client_channel/resolver/fake/fake_resolver.h

@@ -39,7 +39,7 @@ grpc_fake_resolver_response_generator_create();
 // Instruct the fake resolver associated with the \a response_generator instance
 // to trigger a new resolution for \a uri and \a args.
 void grpc_fake_resolver_response_generator_set_response(
-    grpc_exec_ctx* exec_ctx, grpc_fake_resolver_response_generator* generator,
+    grpc_fake_resolver_response_generator* generator,
     grpc_channel_args* next_response);
 
 // Return a \a grpc_arg for a \a grpc_fake_resolver_response_generator instance.

src/core/ext/filters/client_channel/resolver/sockaddr/sockaddr_resolver.cc

@@ -52,15 +52,13 @@ typedef struct {
   grpc_channel_args** target_result;
 } sockaddr_resolver;
 
-static void sockaddr_destroy(grpc_exec_ctx* exec_ctx, grpc_resolver* r);
+static void sockaddr_destroy(grpc_resolver* r);
 
-static void sockaddr_maybe_finish_next_locked(grpc_exec_ctx* exec_ctx,
-                                              sockaddr_resolver* r);
+static void sockaddr_maybe_finish_next_locked(sockaddr_resolver* r);
 
-static void sockaddr_shutdown_locked(grpc_exec_ctx* exec_ctx, grpc_resolver* r);
-static void sockaddr_channel_saw_error_locked(grpc_exec_ctx* exec_ctx,
-                                              grpc_resolver* r);
-static void sockaddr_next_locked(grpc_exec_ctx* exec_ctx, grpc_resolver* r,
+static void sockaddr_shutdown_locked(grpc_resolver* r);
+static void sockaddr_channel_saw_error_locked(grpc_resolver* r);
+static void sockaddr_next_locked(grpc_resolver* r,
                                  grpc_channel_args** target_result,
                                  grpc_closure* on_complete);
 
@@ -68,52 +66,47 @@ static const grpc_resolver_vtable sockaddr_resolver_vtable = {
     sockaddr_destroy, sockaddr_shutdown_locked,
     sockaddr_channel_saw_error_locked, sockaddr_next_locked};
 
-static void sockaddr_shutdown_locked(grpc_exec_ctx* exec_ctx,
-                                     grpc_resolver* resolver) {
+static void sockaddr_shutdown_locked(grpc_resolver* resolver) {
   sockaddr_resolver* r = (sockaddr_resolver*)resolver;
   if (r->next_completion != nullptr) {
     *r->target_result = nullptr;
-    GRPC_CLOSURE_SCHED(
-        exec_ctx, r->next_completion,
-        GRPC_ERROR_CREATE_FROM_STATIC_STRING("Resolver Shutdown"));
+    GRPC_CLOSURE_SCHED(r->next_completion, GRPC_ERROR_CREATE_FROM_STATIC_STRING(
+                                               "Resolver Shutdown"));
     r->next_completion = nullptr;
   }
 }
 
-static void sockaddr_channel_saw_error_locked(grpc_exec_ctx* exec_ctx,
-                                              grpc_resolver* resolver) {
+static void sockaddr_channel_saw_error_locked(grpc_resolver* resolver) {
   sockaddr_resolver* r = (sockaddr_resolver*)resolver;
   r->published = false;
-  sockaddr_maybe_finish_next_locked(exec_ctx, r);
+  sockaddr_maybe_finish_next_locked(r);
 }
 
-static void sockaddr_next_locked(grpc_exec_ctx* exec_ctx,
-                                 grpc_resolver* resolver,
+static void sockaddr_next_locked(grpc_resolver* resolver,
                                  grpc_channel_args** target_result,
                                  grpc_closure* on_complete) {
   sockaddr_resolver* r = (sockaddr_resolver*)resolver;
   GPR_ASSERT(!r->next_completion);
   r->next_completion = on_complete;
   r->target_result = target_result;
-  sockaddr_maybe_finish_next_locked(exec_ctx, r);
+  sockaddr_maybe_finish_next_locked(r);
 }
 
-static void sockaddr_maybe_finish_next_locked(grpc_exec_ctx* exec_ctx,
-                                              sockaddr_resolver* r) {
+static void sockaddr_maybe_finish_next_locked(sockaddr_resolver* r) {
   if (r->next_completion != nullptr && !r->published) {
     r->published = true;
     grpc_arg arg = grpc_lb_addresses_create_channel_arg(r->addresses);
     *r->target_result =
         grpc_channel_args_copy_and_add(r->channel_args, &arg, 1);
-    GRPC_CLOSURE_SCHED(exec_ctx, r->next_completion, GRPC_ERROR_NONE);
+    GRPC_CLOSURE_SCHED(r->next_completion, GRPC_ERROR_NONE);
     r->next_completion = nullptr;
   }
 }
 
-static void sockaddr_destroy(grpc_exec_ctx* exec_ctx, grpc_resolver* gr) {
+static void sockaddr_destroy(grpc_resolver* gr) {
   sockaddr_resolver* r = (sockaddr_resolver*)gr;
-  grpc_lb_addresses_destroy(exec_ctx, r->addresses);
-  grpc_channel_args_destroy(exec_ctx, r->channel_args);
+  grpc_lb_addresses_destroy(r->addresses);
+  grpc_channel_args_destroy(r->channel_args);
   gpr_free(r);
 }
 
@@ -142,8 +135,7 @@ char* unix_get_default_authority(grpc_resolver_factory* factory,
 
 static void do_nothing(void* ignored) {}
 
-static grpc_resolver* sockaddr_create(grpc_exec_ctx* exec_ctx,
-                                      grpc_resolver_args* args,
+static grpc_resolver* sockaddr_create(grpc_resolver_args* args,
                                       bool parse(const grpc_uri* uri,
                                                  grpc_resolved_address* dst)) {
   if (0 != strcmp(args->uri->authority, "")) {
@@ -170,10 +162,10 @@ static grpc_resolver* sockaddr_create(grpc_exec_ctx* exec_ctx,
     gpr_free(part_str);
     if (errors_found) break;
   }
-  grpc_slice_buffer_destroy_internal(exec_ctx, &path_parts);
-  grpc_slice_unref_internal(exec_ctx, path_slice);
+  grpc_slice_buffer_destroy_internal(&path_parts);
+  grpc_slice_unref_internal(path_slice);
   if (errors_found) {
-    grpc_lb_addresses_destroy(exec_ctx, addresses);
+    grpc_lb_addresses_destroy(addresses);
     return nullptr;
   }
   /* Instantiate resolver. */
@@ -195,9 +187,8 @@ static void sockaddr_factory_unref(grpc_resolver_factory* factory) {}
 
 #define DECL_FACTORY(name)                                                  \
   static grpc_resolver* name##_factory_create_resolver(                     \
-      grpc_exec_ctx* exec_ctx, grpc_resolver_factory* factory,              \
-      grpc_resolver_args* args) {                                           \
-    return sockaddr_create(exec_ctx, args, grpc_parse_##name);              \
+      grpc_resolver_factory* factory, grpc_resolver_args* args) {           \
+    return sockaddr_create(args, grpc_parse_##name);                        \
   }                                                                         \
   static const grpc_resolver_factory_vtable name##_factory_vtable = {       \
       sockaddr_factory_ref, sockaddr_factory_unref,                         \

src/core/ext/filters/client_channel/resolver_factory.cc

@@ -28,10 +28,9 @@ void grpc_resolver_factory_unref(grpc_resolver_factory* factory) {
 
 /** Create a resolver instance for a name */
 grpc_resolver* grpc_resolver_factory_create_resolver(
-    grpc_exec_ctx* exec_ctx, grpc_resolver_factory* factory,
-    grpc_resolver_args* args) {
+    grpc_resolver_factory* factory, grpc_resolver_args* args) {
   if (factory == nullptr) return nullptr;
-  return factory->vtable->create_resolver(exec_ctx, factory, args);
+  return factory->vtable->create_resolver(factory, args);
 }
 
 char* grpc_resolver_factory_get_default_authority(

src/core/ext/filters/client_channel/resolver_factory.h

@@ -43,8 +43,7 @@ struct grpc_resolver_factory_vtable {
   void (*unref)(grpc_resolver_factory* factory);
 
   /** Implementation of grpc_resolver_factory_create_resolver */
-  grpc_resolver* (*create_resolver)(grpc_exec_ctx* exec_ctx,
-                                    grpc_resolver_factory* factory,
+  grpc_resolver* (*create_resolver)(grpc_resolver_factory* factory,
                                     grpc_resolver_args* args);
 
   /** Implementation of grpc_resolver_factory_get_default_authority */
@@ -59,8 +58,7 @@ void grpc_resolver_factory_unref(grpc_resolver_factory* resolver);
 
 /** Create a resolver instance for a name */
 grpc_resolver* grpc_resolver_factory_create_resolver(
-    grpc_exec_ctx* exec_ctx, grpc_resolver_factory* factory,
-    grpc_resolver_args* args);
+    grpc_resolver_factory* factory, grpc_resolver_args* args);
 
 /** Return a (freshly allocated with gpr_malloc) string representing
     the default authority to use for this scheme. */

src/core/ext/filters/client_channel/resolver_registry.cc

@@ -92,23 +92,22 @@ static grpc_resolver_factory* lookup_factory_by_uri(grpc_uri* uri) {
   return lookup_factory(uri->scheme);
 }
 
-static grpc_resolver_factory* resolve_factory(grpc_exec_ctx* exec_ctx,
-                                              const char* target,
+static grpc_resolver_factory* resolve_factory(const char* target,
                                               grpc_uri** uri,
                                               char** canonical_target) {
   grpc_resolver_factory* factory = nullptr;
 
   GPR_ASSERT(uri != nullptr);
-  *uri = grpc_uri_parse(exec_ctx, target, 1);
+  *uri = grpc_uri_parse(target, 1);
   factory = lookup_factory_by_uri(*uri);
   if (factory == nullptr) {
     grpc_uri_destroy(*uri);
     gpr_asprintf(canonical_target, "%s%s", g_default_resolver_prefix, target);
-    *uri = grpc_uri_parse(exec_ctx, *canonical_target, 1);
+    *uri = grpc_uri_parse(*canonical_target, 1);
     factory = lookup_factory_by_uri(*uri);
     if (factory == nullptr) {
-      grpc_uri_destroy(grpc_uri_parse(exec_ctx, target, 0));
-      grpc_uri_destroy(grpc_uri_parse(exec_ctx, *canonical_target, 0));
+      grpc_uri_destroy(grpc_uri_parse(target, 0));
+      grpc_uri_destroy(grpc_uri_parse(*canonical_target, 0));
       gpr_log(GPR_ERROR, "don't know how to resolve '%s' or '%s'", target,
               *canonical_target);
     }
@@ -116,14 +115,14 @@ static grpc_resolver_factory* resolve_factory(grpc_exec_ctx* exec_ctx,
   return factory;
 }
 
-grpc_resolver* grpc_resolver_create(grpc_exec_ctx* exec_ctx, const char* target,
+grpc_resolver* grpc_resolver_create(const char* target,
                                     const grpc_channel_args* args,
                                     grpc_pollset_set* pollset_set,
                                     grpc_combiner* combiner) {
   grpc_uri* uri = nullptr;
   char* canonical_target = nullptr;
   grpc_resolver_factory* factory =
-      resolve_factory(exec_ctx, target, &uri, &canonical_target);
+      resolve_factory(target, &uri, &canonical_target);
   grpc_resolver* resolver;
   grpc_resolver_args resolver_args;
   memset(&resolver_args, 0, sizeof(resolver_args));
@@ -131,29 +130,27 @@ grpc_resolver* grpc_resolver_create(grpc_exec_ctx* exec_ctx, const char* target,
   resolver_args.args = args;
   resolver_args.pollset_set = pollset_set;
   resolver_args.combiner = combiner;
-  resolver =
-      grpc_resolver_factory_create_resolver(exec_ctx, factory, &resolver_args);
+  resolver = grpc_resolver_factory_create_resolver(factory, &resolver_args);
   grpc_uri_destroy(uri);
   gpr_free(canonical_target);
   return resolver;
 }
 
-char* grpc_get_default_authority(grpc_exec_ctx* exec_ctx, const char* target) {
+char* grpc_get_default_authority(const char* target) {
   grpc_uri* uri = nullptr;
   char* canonical_target = nullptr;
   grpc_resolver_factory* factory =
-      resolve_factory(exec_ctx, target, &uri, &canonical_target);
+      resolve_factory(target, &uri, &canonical_target);
   char* authority = grpc_resolver_factory_get_default_authority(factory, uri);
   grpc_uri_destroy(uri);
   gpr_free(canonical_target);
   return authority;
 }
 
-char* grpc_resolver_factory_add_default_prefix_if_needed(
-    grpc_exec_ctx* exec_ctx, const char* target) {
+char* grpc_resolver_factory_add_default_prefix_if_needed(const char* target) {
   grpc_uri* uri = nullptr;
   char* canonical_target = nullptr;
-  resolve_factory(exec_ctx, target, &uri, &canonical_target);
+  resolve_factory(target, &uri, &canonical_target);
   grpc_uri_destroy(uri);
   return canonical_target == nullptr ? gpr_strdup(target) : canonical_target;
 }

src/core/ext/filters/client_channel/resolver_registry.h

@@ -48,7 +48,7 @@ void grpc_register_resolver_type(grpc_resolver_factory* factory);
     (typically the set of arguments passed in from the client API).
     \a pollset_set is used to drive IO in the name resolution process, it
     should not be NULL. */
-grpc_resolver* grpc_resolver_create(grpc_exec_ctx* exec_ctx, const char* target,
+grpc_resolver* grpc_resolver_create(const char* target,
                                     const grpc_channel_args* args,
                                     grpc_pollset_set* pollset_set,
                                     grpc_combiner* combiner);
@@ -59,11 +59,10 @@ grpc_resolver_factory* grpc_resolver_factory_lookup(const char* name);
 
 /** Given a target, return a (freshly allocated with gpr_malloc) string
     representing the default authority to pass from a client. */
-char* grpc_get_default_authority(grpc_exec_ctx* exec_ctx, const char* target);
+char* grpc_get_default_authority(const char* target);
 
 /** Returns a newly allocated string containing \a target, adding the
     default prefix if needed. */
-char* grpc_resolver_factory_add_default_prefix_if_needed(
-    grpc_exec_ctx* exec_ctx, const char* target);
+char* grpc_resolver_factory_add_default_prefix_if_needed(const char* target);
 
 #endif /* GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_RESOLVER_REGISTRY_H */

src/core/ext/filters/client_channel/subchannel.cc

@@ -139,8 +139,7 @@ struct grpc_subchannel_call {
 #define CALLSTACK_TO_SUBCHANNEL_CALL(callstack) \
   (((grpc_subchannel_call*)(callstack)) - 1)
 
-static void subchannel_connected(grpc_exec_ctx* exec_ctx, void* subchannel,
-                                 grpc_error* error);
+static void subchannel_connected(void* subchannel, grpc_error* error);
 
 #ifndef NDEBUG
 #define REF_REASON reason
@@ -157,10 +156,9 @@ static void subchannel_connected(grpc_exec_ctx* exec_ctx, void* subchannel,
  * connection implementation
  */
 
-static void connection_destroy(grpc_exec_ctx* exec_ctx, void* arg,
-                               grpc_error* error) {
+static void connection_destroy(void* arg, grpc_error* error) {
   grpc_connected_subchannel* c = (grpc_connected_subchannel*)arg;
-  grpc_channel_stack_destroy(exec_ctx, CHANNEL_STACK_FROM_CONNECTION(c));
+  grpc_channel_stack_destroy(CHANNEL_STACK_FROM_CONNECTION(c));
   gpr_free(c);
 }
 
@@ -170,26 +168,23 @@ grpc_connected_subchannel* grpc_connected_subchannel_ref(
   return c;
 }
 
-void grpc_connected_subchannel_unref(grpc_exec_ctx* exec_ctx,
-                                     grpc_connected_subchannel* c
-                                         GRPC_SUBCHANNEL_REF_EXTRA_ARGS) {
-  GRPC_CHANNEL_STACK_UNREF(exec_ctx, CHANNEL_STACK_FROM_CONNECTION(c),
-                           REF_REASON);
+void grpc_connected_subchannel_unref(
+    grpc_connected_subchannel* c GRPC_SUBCHANNEL_REF_EXTRA_ARGS) {
+  GRPC_CHANNEL_STACK_UNREF(CHANNEL_STACK_FROM_CONNECTION(c), REF_REASON);
 }
 
 /*
  * grpc_subchannel implementation
  */
 
-static void subchannel_destroy(grpc_exec_ctx* exec_ctx, void* arg,
-                               grpc_error* error) {
+static void subchannel_destroy(void* arg, grpc_error* error) {
   grpc_subchannel* c = (grpc_subchannel*)arg;
   gpr_free((void*)c->filters);
-  grpc_channel_args_destroy(exec_ctx, c->args);
-  grpc_connectivity_state_destroy(exec_ctx, &c->state_tracker);
-  grpc_connector_unref(exec_ctx, c->connector);
-  grpc_pollset_set_destroy(exec_ctx, c->pollset_set);
-  grpc_subchannel_key_destroy(exec_ctx, c->key);
+  grpc_channel_args_destroy(c->args);
+  grpc_connectivity_state_destroy(&c->state_tracker);
+  grpc_connector_unref(c->connector);
+  grpc_pollset_set_destroy(c->pollset_set);
+  grpc_subchannel_key_destroy(c->key);
   gpr_mu_destroy(&c->mu);
   gpr_free(c);
 }
@@ -241,59 +236,54 @@ grpc_subchannel* grpc_subchannel_ref_from_weak_ref(
   }
 }
 
-static void disconnect(grpc_exec_ctx* exec_ctx, grpc_subchannel* c) {
+static void disconnect(grpc_subchannel* c) {
   grpc_connected_subchannel* con;
-  grpc_subchannel_index_unregister(exec_ctx, c->key, c);
+  grpc_subchannel_index_unregister(c->key, c);
   gpr_mu_lock(&c->mu);
   GPR_ASSERT(!c->disconnected);
   c->disconnected = true;
-  grpc_connector_shutdown(
-      exec_ctx, c->connector,
-      GRPC_ERROR_CREATE_FROM_STATIC_STRING("Subchannel disconnected"));
+  grpc_connector_shutdown(c->connector, GRPC_ERROR_CREATE_FROM_STATIC_STRING(
+                                            "Subchannel disconnected"));
   con = GET_CONNECTED_SUBCHANNEL(c, no_barrier);
   if (con != nullptr) {
-    GRPC_CONNECTED_SUBCHANNEL_UNREF(exec_ctx, con, "connection");
+    GRPC_CONNECTED_SUBCHANNEL_UNREF(con, "connection");
     gpr_atm_no_barrier_store(&c->connected_subchannel, (gpr_atm)0xdeadbeef);
   }
   gpr_mu_unlock(&c->mu);
 }
 
-void grpc_subchannel_unref(grpc_exec_ctx* exec_ctx,
-                           grpc_subchannel* c GRPC_SUBCHANNEL_REF_EXTRA_ARGS) {
+void grpc_subchannel_unref(grpc_subchannel* c GRPC_SUBCHANNEL_REF_EXTRA_ARGS) {
   gpr_atm old_refs;
   // add a weak ref and subtract a strong ref (atomically)
   old_refs = ref_mutate(c, (gpr_atm)1 - (gpr_atm)(1 << INTERNAL_REF_BITS),
                         1 REF_MUTATE_PURPOSE("STRONG_UNREF"));
   if ((old_refs & STRONG_REF_MASK) == (1 << INTERNAL_REF_BITS)) {
-    disconnect(exec_ctx, c);
+    disconnect(c);
   }
-  GRPC_SUBCHANNEL_WEAK_UNREF(exec_ctx, c, "strong-unref");
+  GRPC_SUBCHANNEL_WEAK_UNREF(c, "strong-unref");
 }
 
-void grpc_subchannel_weak_unref(grpc_exec_ctx* exec_ctx,
-                                grpc_subchannel* c
-                                    GRPC_SUBCHANNEL_REF_EXTRA_ARGS) {
+void grpc_subchannel_weak_unref(
+    grpc_subchannel* c GRPC_SUBCHANNEL_REF_EXTRA_ARGS) {
   gpr_atm old_refs;
   old_refs = ref_mutate(c, -(gpr_atm)1, 1 REF_MUTATE_PURPOSE("WEAK_UNREF"));
   if (old_refs == 1) {
     GRPC_CLOSURE_SCHED(
-        exec_ctx,
         GRPC_CLOSURE_CREATE(subchannel_destroy, c, grpc_schedule_on_exec_ctx),
         GRPC_ERROR_NONE);
   }
 }
 
-grpc_subchannel* grpc_subchannel_create(grpc_exec_ctx* exec_ctx,
-                                        grpc_connector* connector,
+grpc_subchannel* grpc_subchannel_create(grpc_connector* connector,
                                         const grpc_subchannel_args* args) {
   grpc_subchannel_key* key = grpc_subchannel_key_create(args);
-  grpc_subchannel* c = grpc_subchannel_index_find(exec_ctx, key);
+  grpc_subchannel* c = grpc_subchannel_index_find(key);
   if (c) {
-    grpc_subchannel_key_destroy(exec_ctx, key);
+    grpc_subchannel_key_destroy(key);
     return c;
   }
 
-  GRPC_STATS_INC_CLIENT_SUBCHANNELS_CREATED(exec_ctx);
+  GRPC_STATS_INC_CLIENT_SUBCHANNELS_CREATED();
   c = (grpc_subchannel*)gpr_zalloc(sizeof(*c));
   c->key = key;
   gpr_atm_no_barrier_store(&c->ref_pair, 1 << INTERNAL_REF_BITS);
@@ -311,10 +301,10 @@ grpc_subchannel* grpc_subchannel_create(grpc_exec_ctx* exec_ctx,
   c->pollset_set = grpc_pollset_set_create();
   grpc_resolved_address* addr =
       (grpc_resolved_address*)gpr_malloc(sizeof(*addr));
-  grpc_get_subchannel_address_arg(exec_ctx, args->args, addr);
+  grpc_get_subchannel_address_arg(args->args, addr);
   grpc_resolved_address* new_address = nullptr;
   grpc_channel_args* new_args = nullptr;
-  if (grpc_proxy_mappers_map_address(exec_ctx, addr, args->args, &new_address,
+  if (grpc_proxy_mappers_map_address(addr, args->args, &new_address,
                                      &new_args)) {
     GPR_ASSERT(new_address != nullptr);
     gpr_free(addr);
@@ -327,7 +317,7 @@ grpc_subchannel* grpc_subchannel_create(grpc_exec_ctx* exec_ctx,
       new_args != nullptr ? new_args : args->args, keys_to_remove,
       GPR_ARRAY_SIZE(keys_to_remove), &new_arg, 1);
   gpr_free(new_arg.value.string);
-  if (new_args != nullptr) grpc_channel_args_destroy(exec_ctx, new_args);
+  if (new_args != nullptr) grpc_channel_args_destroy(new_args);
   c->root_external_state_watcher.next = c->root_external_state_watcher.prev =
       &c->root_external_state_watcher;
   GRPC_CLOSURE_INIT(&c->connected, subchannel_connected, c,
@@ -373,21 +363,19 @@ grpc_subchannel* grpc_subchannel_create(grpc_exec_ctx* exec_ctx,
       min_backoff_ms, max_backoff_ms);
   gpr_mu_init(&c->mu);
 
-  return grpc_subchannel_index_register(exec_ctx, key, c);
+  return grpc_subchannel_index_register(key, c);
 }
 
-static void continue_connect_locked(grpc_exec_ctx* exec_ctx,
-                                    grpc_subchannel* c) {
+static void continue_connect_locked(grpc_subchannel* c) {
   grpc_connect_in_args args;
 
   args.interested_parties = c->pollset_set;
   args.deadline = c->backoff_result.current_deadline;
   args.channel_args = c->args;
 
-  grpc_connectivity_state_set(exec_ctx, &c->state_tracker,
-                              GRPC_CHANNEL_CONNECTING, GRPC_ERROR_NONE,
-                              "state_change");
-  grpc_connector_connect(exec_ctx, c->connector, &args, &c->connecting_result,
+  grpc_connectivity_state_set(&c->state_tracker, GRPC_CHANNEL_CONNECTING,
+                              GRPC_ERROR_NONE, "state_change");
+  grpc_connector_connect(c->connector, &args, &c->connecting_result,
                          &c->connected);
 }
 
@@ -400,24 +388,23 @@ grpc_connectivity_state grpc_subchannel_check_connectivity(grpc_subchannel* c,
   return state;
 }
 
-static void on_external_state_watcher_done(grpc_exec_ctx* exec_ctx, void* arg,
-                                           grpc_error* error) {
+static void on_external_state_watcher_done(void* arg, grpc_error* error) {
   external_state_watcher* w = (external_state_watcher*)arg;
   grpc_closure* follow_up = w->notify;
   if (w->pollset_set != nullptr) {
-    grpc_pollset_set_del_pollset_set(exec_ctx, w->subchannel->pollset_set,
+    grpc_pollset_set_del_pollset_set(w->subchannel->pollset_set,
                                      w->pollset_set);
   }
   gpr_mu_lock(&w->subchannel->mu);
   w->next->prev = w->prev;
   w->prev->next = w->next;
   gpr_mu_unlock(&w->subchannel->mu);
-  GRPC_SUBCHANNEL_WEAK_UNREF(exec_ctx, w->subchannel, "external_state_watcher");
+  GRPC_SUBCHANNEL_WEAK_UNREF(w->subchannel, "external_state_watcher");
   gpr_free(w);
-  GRPC_CLOSURE_RUN(exec_ctx, follow_up, GRPC_ERROR_REF(error));
+  GRPC_CLOSURE_RUN(follow_up, GRPC_ERROR_REF(error));
 }
 
-static void on_alarm(grpc_exec_ctx* exec_ctx, void* arg, grpc_error* error) {
+static void on_alarm(void* arg, grpc_error* error) {
   grpc_subchannel* c = (grpc_subchannel*)arg;
   gpr_mu_lock(&c->mu);
   c->have_alarm = false;
@@ -429,18 +416,17 @@ static void on_alarm(grpc_exec_ctx* exec_ctx, void* arg, grpc_error* error) {
   }
   if (error == GRPC_ERROR_NONE) {
     gpr_log(GPR_INFO, "Failed to connect to channel, retrying");
-    c->backoff_result = grpc_backoff_step(exec_ctx, &c->backoff_state);
-    continue_connect_locked(exec_ctx, c);
+    c->backoff_result = grpc_backoff_step(&c->backoff_state);
+    continue_connect_locked(c);
     gpr_mu_unlock(&c->mu);
   } else {
     gpr_mu_unlock(&c->mu);
-    GRPC_SUBCHANNEL_WEAK_UNREF(exec_ctx, c, "connecting");
+    GRPC_SUBCHANNEL_WEAK_UNREF(c, "connecting");
   }
   GRPC_ERROR_UNREF(error);
 }
 
-static void maybe_start_connecting_locked(grpc_exec_ctx* exec_ctx,
-                                          grpc_subchannel* c) {
+static void maybe_start_connecting_locked(grpc_subchannel* c) {
   if (c->disconnected) {
     /* Don't try to connect if we're already disconnected */
     return;
@@ -466,28 +452,28 @@ static void maybe_start_connecting_locked(grpc_exec_ctx* exec_ctx,
 
   if (!c->backoff_begun) {
     c->backoff_begun = true;
-    c->backoff_result = grpc_backoff_begin(exec_ctx, &c->backoff_state);
-    continue_connect_locked(exec_ctx, c);
+    c->backoff_result = grpc_backoff_begin(&c->backoff_state);
+    continue_connect_locked(c);
   } else {
     GPR_ASSERT(!c->have_alarm);
     c->have_alarm = true;
     const grpc_millis time_til_next =
-        c->backoff_result.next_attempt_start_time - grpc_exec_ctx_now(exec_ctx);
+        c->backoff_result.next_attempt_start_time -
+        grpc_core::ExecCtx::Get()->Now();
     if (time_til_next <= 0) {
       gpr_log(GPR_INFO, "Retry immediately");
     } else {
       gpr_log(GPR_INFO, "Retry in %" PRIdPTR " milliseconds", time_til_next);
     }
     GRPC_CLOSURE_INIT(&c->on_alarm, on_alarm, c, grpc_schedule_on_exec_ctx);
-    grpc_timer_init(exec_ctx, &c->alarm,
-                    c->backoff_result.next_attempt_start_time, &c->on_alarm);
+    grpc_timer_init(&c->alarm, c->backoff_result.next_attempt_start_time,
+                    &c->on_alarm);
   }
 }
 
 void grpc_subchannel_notify_on_state_change(
-    grpc_exec_ctx* exec_ctx, grpc_subchannel* c,
-    grpc_pollset_set* interested_parties, grpc_connectivity_state* state,
-    grpc_closure* notify) {
+    grpc_subchannel* c, grpc_pollset_set* interested_parties,
+    grpc_connectivity_state* state, grpc_closure* notify) {
   external_state_watcher* w;
 
   if (state == nullptr) {
@@ -495,8 +481,8 @@ void grpc_subchannel_notify_on_state_change(
     for (w = c->root_external_state_watcher.next;
          w != &c->root_external_state_watcher; w = w->next) {
       if (w->notify == notify) {
-        grpc_connectivity_state_notify_on_state_change(
-            exec_ctx, &c->state_tracker, nullptr, &w->closure);
+        grpc_connectivity_state_notify_on_state_change(&c->state_tracker,
+                                                       nullptr, &w->closure);
       }
     }
     gpr_mu_unlock(&c->mu);
@@ -508,31 +494,28 @@ void grpc_subchannel_notify_on_state_change(
     GRPC_CLOSURE_INIT(&w->closure, on_external_state_watcher_done, w,
                       grpc_schedule_on_exec_ctx);
     if (interested_parties != nullptr) {
-      grpc_pollset_set_add_pollset_set(exec_ctx, c->pollset_set,
-                                       interested_parties);
+      grpc_pollset_set_add_pollset_set(c->pollset_set, interested_parties);
     }
     GRPC_SUBCHANNEL_WEAK_REF(c, "external_state_watcher");
     gpr_mu_lock(&c->mu);
     w->next = &c->root_external_state_watcher;
     w->prev = w->next->prev;
     w->next->prev = w->prev->next = w;
-    grpc_connectivity_state_notify_on_state_change(exec_ctx, &c->state_tracker,
-                                                   state, &w->closure);
-    maybe_start_connecting_locked(exec_ctx, c);
+    grpc_connectivity_state_notify_on_state_change(&c->state_tracker, state,
+                                                   &w->closure);
+    maybe_start_connecting_locked(c);
     gpr_mu_unlock(&c->mu);
   }
 }
 
 void grpc_connected_subchannel_process_transport_op(
-    grpc_exec_ctx* exec_ctx, grpc_connected_subchannel* con,
-    grpc_transport_op* op) {
+    grpc_connected_subchannel* con, grpc_transport_op* op) {
   grpc_channel_stack* channel_stack = CHANNEL_STACK_FROM_CONNECTION(con);
   grpc_channel_element* top_elem = grpc_channel_stack_element(channel_stack, 0);
-  top_elem->filter->start_transport_op(exec_ctx, top_elem, op);
+  top_elem->filter->start_transport_op(top_elem, op);
 }
 
-static void subchannel_on_child_state_changed(grpc_exec_ctx* exec_ctx, void* p,
-                                              grpc_error* error) {
+static void subchannel_on_child_state_changed(void* p, grpc_error* error) {
   state_watcher* sw = (state_watcher*)p;
   grpc_subchannel* c = sw->subchannel;
   gpr_mu* mu = &c->mu;
@@ -544,24 +527,22 @@ static void subchannel_on_child_state_changed(grpc_exec_ctx* exec_ctx, void* p,
     /* any errors on a subchannel ==> we're done, create a new one */
     sw->connectivity_state = GRPC_CHANNEL_SHUTDOWN;
   }
-  grpc_connectivity_state_set(exec_ctx, &c->state_tracker,
-                              sw->connectivity_state, GRPC_ERROR_REF(error),
-                              "reflect_child");
+  grpc_connectivity_state_set(&c->state_tracker, sw->connectivity_state,
+                              GRPC_ERROR_REF(error), "reflect_child");
   if (sw->connectivity_state != GRPC_CHANNEL_SHUTDOWN) {
     grpc_connected_subchannel_notify_on_state_change(
-        exec_ctx, GET_CONNECTED_SUBCHANNEL(c, no_barrier), nullptr,
+        GET_CONNECTED_SUBCHANNEL(c, no_barrier), nullptr,
         &sw->connectivity_state, &sw->closure);
     GRPC_SUBCHANNEL_WEAK_REF(c, "state_watcher");
     sw = nullptr;
   }
 
   gpr_mu_unlock(mu);
-  GRPC_SUBCHANNEL_WEAK_UNREF(exec_ctx, c, "state_watcher");
+  GRPC_SUBCHANNEL_WEAK_UNREF(c, "state_watcher");
   gpr_free(sw);
 }
 
-static void connected_subchannel_state_op(grpc_exec_ctx* exec_ctx,
-                                          grpc_connected_subchannel* con,
+static void connected_subchannel_state_op(grpc_connected_subchannel* con,
                                           grpc_pollset_set* interested_parties,
                                           grpc_connectivity_state* state,
                                           grpc_closure* closure) {
@@ -571,19 +552,16 @@ static void connected_subchannel_state_op(grpc_exec_ctx* exec_ctx,
   op->on_connectivity_state_change = closure;
   op->bind_pollset_set = interested_parties;
   elem = grpc_channel_stack_element(CHANNEL_STACK_FROM_CONNECTION(con), 0);
-  elem->filter->start_transport_op(exec_ctx, elem, op);
+  elem->filter->start_transport_op(elem, op);
 }
 
 void grpc_connected_subchannel_notify_on_state_change(
-    grpc_exec_ctx* exec_ctx, grpc_connected_subchannel* con,
-    grpc_pollset_set* interested_parties, grpc_connectivity_state* state,
-    grpc_closure* closure) {
-  connected_subchannel_state_op(exec_ctx, con, interested_parties, state,
-                                closure);
+    grpc_connected_subchannel* con, grpc_pollset_set* interested_parties,
+    grpc_connectivity_state* state, grpc_closure* closure) {
+  connected_subchannel_state_op(con, interested_parties, state, closure);
 }
 
-void grpc_connected_subchannel_ping(grpc_exec_ctx* exec_ctx,
-                                    grpc_connected_subchannel* con,
+void grpc_connected_subchannel_ping(grpc_connected_subchannel* con,
                                     grpc_closure* on_initiate,
                                     grpc_closure* on_ack) {
   grpc_transport_op* op = grpc_make_transport_op(nullptr);
@@ -591,11 +569,10 @@ void grpc_connected_subchannel_ping(grpc_exec_ctx* exec_ctx,
   op->send_ping.on_initiate = on_initiate;
   op->send_ping.on_ack = on_ack;
   elem = grpc_channel_stack_element(CHANNEL_STACK_FROM_CONNECTION(con), 0);
-  elem->filter->start_transport_op(exec_ctx, elem, op);
+  elem->filter->start_transport_op(elem, op);
 }
 
-static bool publish_transport_locked(grpc_exec_ctx* exec_ctx,
-                                     grpc_subchannel* c) {
+static bool publish_transport_locked(grpc_subchannel* c) {
   grpc_connected_subchannel* con;
   grpc_channel_stack* stk;
   state_watcher* sw_subchannel;
@@ -603,19 +580,18 @@ static bool publish_transport_locked(grpc_exec_ctx* exec_ctx,
   /* construct channel stack */
   grpc_channel_stack_builder* builder = grpc_channel_stack_builder_create();
   grpc_channel_stack_builder_set_channel_arguments(
-      exec_ctx, builder, c->connecting_result.channel_args);
+      builder, c->connecting_result.channel_args);
   grpc_channel_stack_builder_set_transport(builder,
                                            c->connecting_result.transport);
 
-  if (!grpc_channel_init_create_stack(exec_ctx, builder,
-                                      GRPC_CLIENT_SUBCHANNEL)) {
-    grpc_channel_stack_builder_destroy(exec_ctx, builder);
+  if (!grpc_channel_init_create_stack(builder, GRPC_CLIENT_SUBCHANNEL)) {
+    grpc_channel_stack_builder_destroy(builder);
     return false;
   }
   grpc_error* error = grpc_channel_stack_builder_finish(
-      exec_ctx, builder, 0, 1, connection_destroy, nullptr, (void**)&con);
+      builder, 0, 1, connection_destroy, nullptr, (void**)&con);
   if (error != GRPC_ERROR_NONE) {
-    grpc_transport_destroy(exec_ctx, c->connecting_result.transport);
+    grpc_transport_destroy(c->connecting_result.transport);
     gpr_log(GPR_ERROR, "error initializing subchannel stack: %s",
             grpc_error_string(error));
     GRPC_ERROR_UNREF(error);
@@ -633,7 +609,7 @@ static bool publish_transport_locked(grpc_exec_ctx* exec_ctx,
 
   if (c->disconnected) {
     gpr_free(sw_subchannel);
-    grpc_channel_stack_destroy(exec_ctx, stk);
+    grpc_channel_stack_destroy(stk);
     gpr_free(con);
     return false;
   }
@@ -649,19 +625,18 @@ static bool publish_transport_locked(grpc_exec_ctx* exec_ctx,
   /* setup subchannel watching connected subchannel for changes; subchannel
      ref for connecting is donated to the state watcher */
   GRPC_SUBCHANNEL_WEAK_REF(c, "state_watcher");
-  GRPC_SUBCHANNEL_WEAK_UNREF(exec_ctx, c, "connecting");
+  GRPC_SUBCHANNEL_WEAK_UNREF(c, "connecting");
   grpc_connected_subchannel_notify_on_state_change(
-      exec_ctx, con, c->pollset_set, &sw_subchannel->connectivity_state,
+      con, c->pollset_set, &sw_subchannel->connectivity_state,
       &sw_subchannel->closure);
 
   /* signal completion */
-  grpc_connectivity_state_set(exec_ctx, &c->state_tracker, GRPC_CHANNEL_READY,
+  grpc_connectivity_state_set(&c->state_tracker, GRPC_CHANNEL_READY,
                               GRPC_ERROR_NONE, "connected");
   return true;
 }
 
-static void subchannel_connected(grpc_exec_ctx* exec_ctx, void* arg,
-                                 grpc_error* error) {
+static void subchannel_connected(void* arg, grpc_error* error) {
   grpc_subchannel* c = (grpc_subchannel*)arg;
   grpc_channel_args* delete_channel_args = c->connecting_result.channel_args;
 
@@ -669,13 +644,13 @@ static void subchannel_connected(grpc_exec_ctx* exec_ctx, void* arg,
   gpr_mu_lock(&c->mu);
   c->connecting = false;
   if (c->connecting_result.transport != nullptr &&
-      publish_transport_locked(exec_ctx, c)) {
+      publish_transport_locked(c)) {
     /* do nothing, transport was published */
   } else if (c->disconnected) {
-    GRPC_SUBCHANNEL_WEAK_UNREF(exec_ctx, c, "connecting");
+    GRPC_SUBCHANNEL_WEAK_UNREF(c, "connecting");
   } else {
     grpc_connectivity_state_set(
-        exec_ctx, &c->state_tracker, GRPC_CHANNEL_TRANSIENT_FAILURE,
+        &c->state_tracker, GRPC_CHANNEL_TRANSIENT_FAILURE,
         grpc_error_set_int(GRPC_ERROR_CREATE_REFERENCING_FROM_STATIC_STRING(
                                "Connect Failed", &error, 1),
                            GRPC_ERROR_INT_GRPC_STATUS, GRPC_STATUS_UNAVAILABLE),
@@ -684,27 +659,26 @@ static void subchannel_connected(grpc_exec_ctx* exec_ctx, void* arg,
     const char* errmsg = grpc_error_string(error);
     gpr_log(GPR_INFO, "Connect failed: %s", errmsg);
 
-    maybe_start_connecting_locked(exec_ctx, c);
-    GRPC_SUBCHANNEL_WEAK_UNREF(exec_ctx, c, "connecting");
+    maybe_start_connecting_locked(c);
+    GRPC_SUBCHANNEL_WEAK_UNREF(c, "connecting");
   }
   gpr_mu_unlock(&c->mu);
-  GRPC_SUBCHANNEL_WEAK_UNREF(exec_ctx, c, "connected");
-  grpc_channel_args_destroy(exec_ctx, delete_channel_args);
+  GRPC_SUBCHANNEL_WEAK_UNREF(c, "connected");
+  grpc_channel_args_destroy(delete_channel_args);
 }
 
 /*
  * grpc_subchannel_call implementation
  */
 
-static void subchannel_call_destroy(grpc_exec_ctx* exec_ctx, void* call,
-                                    grpc_error* error) {
+static void subchannel_call_destroy(void* call, grpc_error* error) {
   grpc_subchannel_call* c = (grpc_subchannel_call*)call;
   GPR_ASSERT(c->schedule_closure_after_destroy != nullptr);
   GPR_TIMER_BEGIN("grpc_subchannel_call_unref.destroy", 0);
   grpc_connected_subchannel* connection = c->connection;
-  grpc_call_stack_destroy(exec_ctx, SUBCHANNEL_CALL_TO_CALL_STACK(c), nullptr,
+  grpc_call_stack_destroy(SUBCHANNEL_CALL_TO_CALL_STACK(c), nullptr,
                           c->schedule_closure_after_destroy);
-  GRPC_CONNECTED_SUBCHANNEL_UNREF(exec_ctx, connection, "subchannel_call");
+  GRPC_CONNECTED_SUBCHANNEL_UNREF(connection, "subchannel_call");
   GPR_TIMER_END("grpc_subchannel_call_unref.destroy", 0);
 }
 
@@ -720,20 +694,18 @@ void grpc_subchannel_call_ref(
   GRPC_CALL_STACK_REF(SUBCHANNEL_CALL_TO_CALL_STACK(c), REF_REASON);
 }
 
-void grpc_subchannel_call_unref(grpc_exec_ctx* exec_ctx,
-                                grpc_subchannel_call* c
-                                    GRPC_SUBCHANNEL_REF_EXTRA_ARGS) {
-  GRPC_CALL_STACK_UNREF(exec_ctx, SUBCHANNEL_CALL_TO_CALL_STACK(c), REF_REASON);
+void grpc_subchannel_call_unref(
+    grpc_subchannel_call* c GRPC_SUBCHANNEL_REF_EXTRA_ARGS) {
+  GRPC_CALL_STACK_UNREF(SUBCHANNEL_CALL_TO_CALL_STACK(c), REF_REASON);
 }
 
-void grpc_subchannel_call_process_op(grpc_exec_ctx* exec_ctx,
-                                     grpc_subchannel_call* call,
+void grpc_subchannel_call_process_op(grpc_subchannel_call* call,
                                      grpc_transport_stream_op_batch* batch) {
   GPR_TIMER_BEGIN("grpc_subchannel_call_process_op", 0);
   grpc_call_stack* call_stack = SUBCHANNEL_CALL_TO_CALL_STACK(call);
   grpc_call_element* top_elem = grpc_call_stack_element(call_stack, 0);
   GRPC_CALL_LOG_OP(GPR_INFO, top_elem, batch);
-  top_elem->filter->start_transport_stream_op_batch(exec_ctx, top_elem, batch);
+  top_elem->filter->start_transport_stream_op_batch(top_elem, batch);
   GPR_TIMER_END("grpc_subchannel_call_process_op", 0);
 }
 
@@ -748,7 +720,7 @@ const grpc_subchannel_key* grpc_subchannel_get_key(
 }
 
 grpc_error* grpc_connected_subchannel_create_call(
-    grpc_exec_ctx* exec_ctx, grpc_connected_subchannel* con,
+    grpc_connected_subchannel* con,
     const grpc_connected_subchannel_call_args* args,
     grpc_subchannel_call** call) {
   grpc_channel_stack* chanstk = CHANNEL_STACK_FROM_CONNECTION(con);
@@ -766,14 +738,14 @@ grpc_error* grpc_connected_subchannel_create_call(
       args->arena,        /* arena */
       args->call_combiner /* call_combiner */
   };
-  grpc_error* error = grpc_call_stack_init(
-      exec_ctx, chanstk, 1, subchannel_call_destroy, *call, &call_args);
+  grpc_error* error = grpc_call_stack_init(chanstk, 1, subchannel_call_destroy,
+                                           *call, &call_args);
   if (error != GRPC_ERROR_NONE) {
     const char* error_string = grpc_error_string(error);
     gpr_log(GPR_ERROR, "error: %s", error_string);
     return error;
   }
-  grpc_call_stack_set_pollset_or_pollset_set(exec_ctx, callstk, args->pollent);
+  grpc_call_stack_set_pollset_or_pollset_set(callstk, args->pollent);
   return GRPC_ERROR_NONE;
 }
 
@@ -782,21 +754,20 @@ grpc_call_stack* grpc_subchannel_call_get_call_stack(
   return SUBCHANNEL_CALL_TO_CALL_STACK(subchannel_call);
 }
 
-static void grpc_uri_to_sockaddr(grpc_exec_ctx* exec_ctx, const char* uri_str,
+static void grpc_uri_to_sockaddr(const char* uri_str,
                                  grpc_resolved_address* addr) {
-  grpc_uri* uri = grpc_uri_parse(exec_ctx, uri_str, 0 /* suppress_errors */);
+  grpc_uri* uri = grpc_uri_parse(uri_str, 0 /* suppress_errors */);
   GPR_ASSERT(uri != nullptr);
   if (!grpc_parse_uri(uri, addr)) memset(addr, 0, sizeof(*addr));
   grpc_uri_destroy(uri);
 }
 
-void grpc_get_subchannel_address_arg(grpc_exec_ctx* exec_ctx,
-                                     const grpc_channel_args* args,
+void grpc_get_subchannel_address_arg(const grpc_channel_args* args,
                                      grpc_resolved_address* addr) {
   const char* addr_uri_str = grpc_get_subchannel_address_uri_arg(args);
   memset(addr, 0, sizeof(*addr));
   if (*addr_uri_str != '\0') {
-    grpc_uri_to_sockaddr(exec_ctx, addr_uri_str, addr);
+    grpc_uri_to_sockaddr(addr_uri_str, addr);
   }
 }
 

src/core/ext/filters/client_channel/subchannel.h

@@ -42,36 +42,34 @@ typedef struct grpc_subchannel_key grpc_subchannel_key;
   grpc_subchannel_ref((p), __FILE__, __LINE__, (r))
 #define GRPC_SUBCHANNEL_REF_FROM_WEAK_REF(p, r) \
   grpc_subchannel_ref_from_weak_ref((p), __FILE__, __LINE__, (r))
-#define GRPC_SUBCHANNEL_UNREF(cl, p, r) \
-  grpc_subchannel_unref((cl), (p), __FILE__, __LINE__, (r))
+#define GRPC_SUBCHANNEL_UNREF(p, r) \
+  grpc_subchannel_unref((p), __FILE__, __LINE__, (r))
 #define GRPC_SUBCHANNEL_WEAK_REF(p, r) \
   grpc_subchannel_weak_ref((p), __FILE__, __LINE__, (r))
-#define GRPC_SUBCHANNEL_WEAK_UNREF(cl, p, r) \
-  grpc_subchannel_weak_unref((cl), (p), __FILE__, __LINE__, (r))
+#define GRPC_SUBCHANNEL_WEAK_UNREF(p, r) \
+  grpc_subchannel_weak_unref((p), __FILE__, __LINE__, (r))
 #define GRPC_CONNECTED_SUBCHANNEL_REF(p, r) \
   grpc_connected_subchannel_ref((p), __FILE__, __LINE__, (r))
-#define GRPC_CONNECTED_SUBCHANNEL_UNREF(cl, p, r) \
-  grpc_connected_subchannel_unref((cl), (p), __FILE__, __LINE__, (r))
+#define GRPC_CONNECTED_SUBCHANNEL_UNREF(p, r) \
+  grpc_connected_subchannel_unref((p), __FILE__, __LINE__, (r))
 #define GRPC_SUBCHANNEL_CALL_REF(p, r) \
   grpc_subchannel_call_ref((p), __FILE__, __LINE__, (r))
-#define GRPC_SUBCHANNEL_CALL_UNREF(cl, p, r) \
-  grpc_subchannel_call_unref((cl), (p), __FILE__, __LINE__, (r))
+#define GRPC_SUBCHANNEL_CALL_UNREF(p, r) \
+  grpc_subchannel_call_unref((p), __FILE__, __LINE__, (r))
 #define GRPC_SUBCHANNEL_REF_EXTRA_ARGS \
   , const char *file, int line, const char *reason
 #else
 #define GRPC_SUBCHANNEL_REF(p, r) grpc_subchannel_ref((p))
 #define GRPC_SUBCHANNEL_REF_FROM_WEAK_REF(p, r) \
   grpc_subchannel_ref_from_weak_ref((p))
-#define GRPC_SUBCHANNEL_UNREF(cl, p, r) grpc_subchannel_unref((cl), (p))
+#define GRPC_SUBCHANNEL_UNREF(p, r) grpc_subchannel_unref((p))
 #define GRPC_SUBCHANNEL_WEAK_REF(p, r) grpc_subchannel_weak_ref((p))
-#define GRPC_SUBCHANNEL_WEAK_UNREF(cl, p, r) \
-  grpc_subchannel_weak_unref((cl), (p))
+#define GRPC_SUBCHANNEL_WEAK_UNREF(p, r) grpc_subchannel_weak_unref((p))
 #define GRPC_CONNECTED_SUBCHANNEL_REF(p, r) grpc_connected_subchannel_ref((p))
-#define GRPC_CONNECTED_SUBCHANNEL_UNREF(cl, p, r) \
-  grpc_connected_subchannel_unref((cl), (p))
+#define GRPC_CONNECTED_SUBCHANNEL_UNREF(p, r) \
+  grpc_connected_subchannel_unref((p))
 #define GRPC_SUBCHANNEL_CALL_REF(p, r) grpc_subchannel_call_ref((p))
-#define GRPC_SUBCHANNEL_CALL_UNREF(cl, p, r) \
-  grpc_subchannel_call_unref((cl), (p))
+#define GRPC_SUBCHANNEL_CALL_UNREF(p, r) grpc_subchannel_call_unref((p))
 #define GRPC_SUBCHANNEL_REF_EXTRA_ARGS
 #endif
 
@@ -79,24 +77,20 @@ grpc_subchannel* grpc_subchannel_ref(
     grpc_subchannel* channel GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
 grpc_subchannel* grpc_subchannel_ref_from_weak_ref(
     grpc_subchannel* channel GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
-void grpc_subchannel_unref(grpc_exec_ctx* exec_ctx,
-                           grpc_subchannel* channel
-                               GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
+void grpc_subchannel_unref(
+    grpc_subchannel* channel GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
 grpc_subchannel* grpc_subchannel_weak_ref(
     grpc_subchannel* channel GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
-void grpc_subchannel_weak_unref(grpc_exec_ctx* exec_ctx,
-                                grpc_subchannel* channel
-                                    GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
+void grpc_subchannel_weak_unref(
+    grpc_subchannel* channel GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
 grpc_connected_subchannel* grpc_connected_subchannel_ref(
     grpc_connected_subchannel* channel GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
-void grpc_connected_subchannel_unref(grpc_exec_ctx* exec_ctx,
-                                     grpc_connected_subchannel* channel
-                                         GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
+void grpc_connected_subchannel_unref(
+    grpc_connected_subchannel* channel GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
 void grpc_subchannel_call_ref(
     grpc_subchannel_call* call GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
-void grpc_subchannel_call_unref(grpc_exec_ctx* exec_ctx,
-                                grpc_subchannel_call* call
-                                    GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
+void grpc_subchannel_call_unref(
+    grpc_subchannel_call* call GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
 
 /** construct a subchannel call */
 typedef struct {
@@ -110,14 +104,13 @@ typedef struct {
 } grpc_connected_subchannel_call_args;
 
 grpc_error* grpc_connected_subchannel_create_call(
-    grpc_exec_ctx* exec_ctx, grpc_connected_subchannel* connected_subchannel,
+    grpc_connected_subchannel* connected_subchannel,
     const grpc_connected_subchannel_call_args* args,
     grpc_subchannel_call** subchannel_call);
 
 /** process a transport level op */
 void grpc_connected_subchannel_process_transport_op(
-    grpc_exec_ctx* exec_ctx, grpc_connected_subchannel* subchannel,
-    grpc_transport_op* op);
+    grpc_connected_subchannel* subchannel, grpc_transport_op* op);
 
 /** poll the current connectivity state of a channel */
 grpc_connectivity_state grpc_subchannel_check_connectivity(
@@ -126,15 +119,12 @@ grpc_connectivity_state grpc_subchannel_check_connectivity(
 /** Calls notify when the connectivity state of a channel becomes different
     from *state.  Updates *state with the new state of the channel. */
 void grpc_subchannel_notify_on_state_change(
-    grpc_exec_ctx* exec_ctx, grpc_subchannel* channel,
-    grpc_pollset_set* interested_parties, grpc_connectivity_state* state,
-    grpc_closure* notify);
+    grpc_subchannel* channel, grpc_pollset_set* interested_parties,
+    grpc_connectivity_state* state, grpc_closure* notify);
 void grpc_connected_subchannel_notify_on_state_change(
-    grpc_exec_ctx* exec_ctx, grpc_connected_subchannel* channel,
-    grpc_pollset_set* interested_parties, grpc_connectivity_state* state,
-    grpc_closure* notify);
-void grpc_connected_subchannel_ping(grpc_exec_ctx* exec_ctx,
-                                    grpc_connected_subchannel* channel,
+    grpc_connected_subchannel* channel, grpc_pollset_set* interested_parties,
+    grpc_connectivity_state* state, grpc_closure* notify);
+void grpc_connected_subchannel_ping(grpc_connected_subchannel* channel,
                                     grpc_closure* on_initiate,
                                     grpc_closure* on_ack);
 
@@ -148,8 +138,7 @@ const grpc_subchannel_key* grpc_subchannel_get_key(
     const grpc_subchannel* subchannel);
 
 /** continue processing a transport op */
-void grpc_subchannel_call_process_op(grpc_exec_ctx* exec_ctx,
-                                     grpc_subchannel_call* subchannel_call,
+void grpc_subchannel_call_process_op(grpc_subchannel_call* subchannel_call,
                                      grpc_transport_stream_op_batch* op);
 
 /** Must be called once per call. Sets the 'then_schedule_closure' argument for
@@ -173,13 +162,11 @@ struct grpc_subchannel_args {
 };
 
 /** create a subchannel given a connector */
-grpc_subchannel* grpc_subchannel_create(grpc_exec_ctx* exec_ctx,
-                                        grpc_connector* connector,
+grpc_subchannel* grpc_subchannel_create(grpc_connector* connector,
                                         const grpc_subchannel_args* args);
 
 /// Sets \a addr from \a args.
-void grpc_get_subchannel_address_arg(grpc_exec_ctx* exec_ctx,
-                                     const grpc_channel_args* args,
+void grpc_get_subchannel_address_arg(const grpc_channel_args* args,
                                      grpc_resolved_address* addr);
 
 /// Returns the URI string for the address to connect to.

src/core/ext/filters/client_channel/subchannel_index.cc

@@ -81,16 +81,14 @@ int grpc_subchannel_key_compare(const grpc_subchannel_key* a,
   return grpc_channel_args_compare(a->args.args, b->args.args);
 }
 
-void grpc_subchannel_key_destroy(grpc_exec_ctx* exec_ctx,
-                                 grpc_subchannel_key* k) {
+void grpc_subchannel_key_destroy(grpc_subchannel_key* k) {
   gpr_free((grpc_channel_args*)k->args.filters);
-  grpc_channel_args_destroy(exec_ctx, (grpc_channel_args*)k->args.args);
+  grpc_channel_args_destroy((grpc_channel_args*)k->args.args);
   gpr_free(k);
 }
 
 static void sck_avl_destroy(void* p, void* user_data) {
-  grpc_exec_ctx* exec_ctx = (grpc_exec_ctx*)user_data;
-  grpc_subchannel_key_destroy(exec_ctx, (grpc_subchannel_key*)p);
+  grpc_subchannel_key_destroy((grpc_subchannel_key*)p);
 }
 
 static void* sck_avl_copy(void* p, void* unused) {
@@ -103,8 +101,7 @@ static long sck_avl_compare(void* a, void* b, void* unused) {
 }
 
 static void scv_avl_destroy(void* p, void* user_data) {
-  grpc_exec_ctx* exec_ctx = (grpc_exec_ctx*)user_data;
-  GRPC_SUBCHANNEL_WEAK_UNREF(exec_ctx, (grpc_subchannel*)p, "subchannel_index");
+  GRPC_SUBCHANNEL_WEAK_UNREF((grpc_subchannel*)p, "subchannel_index");
 }
 
 static void* scv_avl_copy(void* p, void* unused) {
@@ -135,32 +132,29 @@ void grpc_subchannel_index_shutdown(void) {
 
 void grpc_subchannel_index_unref(void) {
   if (gpr_unref(&g_refcount)) {
-    grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
     gpr_mu_destroy(&g_mu);
-    gpr_avl_unref(g_subchannel_index, &exec_ctx);
-    grpc_exec_ctx_finish(&exec_ctx);
+    gpr_avl_unref(g_subchannel_index, grpc_core::ExecCtx::Get());
   }
 }
 
 void grpc_subchannel_index_ref(void) { gpr_ref_non_zero(&g_refcount); }
 
-grpc_subchannel* grpc_subchannel_index_find(grpc_exec_ctx* exec_ctx,
-                                            grpc_subchannel_key* key) {
+grpc_subchannel* grpc_subchannel_index_find(grpc_subchannel_key* key) {
   // Lock, and take a reference to the subchannel index.
   // We don't need to do the search under a lock as avl's are immutable.
   gpr_mu_lock(&g_mu);
-  gpr_avl index = gpr_avl_ref(g_subchannel_index, exec_ctx);
+  gpr_avl index = gpr_avl_ref(g_subchannel_index, grpc_core::ExecCtx::Get());
   gpr_mu_unlock(&g_mu);
 
   grpc_subchannel* c = GRPC_SUBCHANNEL_REF_FROM_WEAK_REF(
-      (grpc_subchannel*)gpr_avl_get(index, key, exec_ctx), "index_find");
-  gpr_avl_unref(index, exec_ctx);
+      (grpc_subchannel*)gpr_avl_get(index, key, grpc_core::ExecCtx::Get()),
+      "index_find");
+  gpr_avl_unref(index, grpc_core::ExecCtx::Get());
 
   return c;
 }
 
-grpc_subchannel* grpc_subchannel_index_register(grpc_exec_ctx* exec_ctx,
-                                                grpc_subchannel_key* key,
+grpc_subchannel* grpc_subchannel_index_register(grpc_subchannel_key* key,
                                                 grpc_subchannel* constructed) {
   grpc_subchannel* c = nullptr;
   bool need_to_unref_constructed = false;
@@ -171,11 +165,11 @@ grpc_subchannel* grpc_subchannel_index_register(grpc_exec_ctx* exec_ctx,
     // Compare and swap loop:
     // - take a reference to the current index
     gpr_mu_lock(&g_mu);
-    gpr_avl index = gpr_avl_ref(g_subchannel_index, exec_ctx);
+    gpr_avl index = gpr_avl_ref(g_subchannel_index, grpc_core::ExecCtx::Get());
     gpr_mu_unlock(&g_mu);
 
     // - Check to see if a subchannel already exists
-    c = (grpc_subchannel*)gpr_avl_get(index, key, exec_ctx);
+    c = (grpc_subchannel*)gpr_avl_get(index, key, grpc_core::ExecCtx::Get());
     if (c != nullptr) {
       c = GRPC_SUBCHANNEL_REF_FROM_WEAK_REF(c, "index_register");
     }
@@ -184,9 +178,11 @@ grpc_subchannel* grpc_subchannel_index_register(grpc_exec_ctx* exec_ctx,
       need_to_unref_constructed = true;
     } else {
       // no -> update the avl and compare/swap
-      gpr_avl updated = gpr_avl_add(
-          gpr_avl_ref(index, exec_ctx), subchannel_key_copy(key),
-          GRPC_SUBCHANNEL_WEAK_REF(constructed, "index_register"), exec_ctx);
+      gpr_avl updated =
+          gpr_avl_add(gpr_avl_ref(index, grpc_core::ExecCtx::Get()),
+                      subchannel_key_copy(key),
+                      GRPC_SUBCHANNEL_WEAK_REF(constructed, "index_register"),
+                      grpc_core::ExecCtx::Get());
 
       // it may happen (but it's expected to be unlikely)
       // that some other thread has changed the index:
@@ -198,41 +194,42 @@ grpc_subchannel* grpc_subchannel_index_register(grpc_exec_ctx* exec_ctx,
       }
       gpr_mu_unlock(&g_mu);
 
-      gpr_avl_unref(updated, exec_ctx);
+      gpr_avl_unref(updated, grpc_core::ExecCtx::Get());
     }
-    gpr_avl_unref(index, exec_ctx);
+    gpr_avl_unref(index, grpc_core::ExecCtx::Get());
   }
 
   if (need_to_unref_constructed) {
-    GRPC_SUBCHANNEL_UNREF(exec_ctx, constructed, "index_register");
+    GRPC_SUBCHANNEL_UNREF(constructed, "index_register");
   }
 
   return c;
 }
 
-void grpc_subchannel_index_unregister(grpc_exec_ctx* exec_ctx,
-                                      grpc_subchannel_key* key,
+void grpc_subchannel_index_unregister(grpc_subchannel_key* key,
                                       grpc_subchannel* constructed) {
   bool done = false;
   while (!done) {
     // Compare and swap loop:
     // - take a reference to the current index
     gpr_mu_lock(&g_mu);
-    gpr_avl index = gpr_avl_ref(g_subchannel_index, exec_ctx);
+    gpr_avl index = gpr_avl_ref(g_subchannel_index, grpc_core::ExecCtx::Get());
     gpr_mu_unlock(&g_mu);
 
     // Check to see if this key still refers to the previously
     // registered subchannel
-    grpc_subchannel* c = (grpc_subchannel*)gpr_avl_get(index, key, exec_ctx);
+    grpc_subchannel* c =
+        (grpc_subchannel*)gpr_avl_get(index, key, grpc_core::ExecCtx::Get());
     if (c != constructed) {
-      gpr_avl_unref(index, exec_ctx);
+      gpr_avl_unref(index, grpc_core::ExecCtx::Get());
       break;
     }
 
     // compare and swap the update (some other thread may have
     // mutated the index behind us)
     gpr_avl updated =
-        gpr_avl_remove(gpr_avl_ref(index, exec_ctx), key, exec_ctx);
+        gpr_avl_remove(gpr_avl_ref(index, grpc_core::ExecCtx::Get()), key,
+                       grpc_core::ExecCtx::Get());
 
     gpr_mu_lock(&g_mu);
     if (index.root == g_subchannel_index.root) {
@@ -241,8 +238,8 @@ void grpc_subchannel_index_unregister(grpc_exec_ctx* exec_ctx,
     }
     gpr_mu_unlock(&g_mu);
 
-    gpr_avl_unref(updated, exec_ctx);
-    gpr_avl_unref(index, exec_ctx);
+    gpr_avl_unref(updated, grpc_core::ExecCtx::Get());
+    gpr_avl_unref(index, grpc_core::ExecCtx::Get());
   }
 }
 

src/core/ext/filters/client_channel/subchannel_index.h

@@ -29,26 +29,22 @@ grpc_subchannel_key* grpc_subchannel_key_create(
     const grpc_subchannel_args* args);
 
 /** Destroy a subchannel key */
-void grpc_subchannel_key_destroy(grpc_exec_ctx* exec_ctx,
-                                 grpc_subchannel_key* key);
+void grpc_subchannel_key_destroy(grpc_subchannel_key* key);
 
 /** Given a subchannel key, find the subchannel registered for it.
     Returns NULL if no such channel exists.
     Thread-safe. */
-grpc_subchannel* grpc_subchannel_index_find(grpc_exec_ctx* exec_ctx,
-                                            grpc_subchannel_key* key);
+grpc_subchannel* grpc_subchannel_index_find(grpc_subchannel_key* key);
 
 /** Register a subchannel against a key.
     Takes ownership of \a constructed.
     Returns the registered subchannel. This may be different from
     \a constructed in the case of a registration race. */
-grpc_subchannel* grpc_subchannel_index_register(grpc_exec_ctx* exec_ctx,
-                                                grpc_subchannel_key* key,
+grpc_subchannel* grpc_subchannel_index_register(grpc_subchannel_key* key,
                                                 grpc_subchannel* constructed);
 
 /** Remove \a constructed as the registered subchannel for \a key. */
-void grpc_subchannel_index_unregister(grpc_exec_ctx* exec_ctx,
-                                      grpc_subchannel_key* key,
+void grpc_subchannel_index_unregister(grpc_subchannel_key* key,
                                       grpc_subchannel* constructed);
 
 int grpc_subchannel_key_compare(const grpc_subchannel_key* a,

src/core/ext/filters/client_channel/uri_parser.cc

@@ -56,8 +56,8 @@ static grpc_uri* bad_uri(const char* uri_text, size_t pos, const char* section,
 }
 
 /** Returns a copy of percent decoded \a src[begin, end) */
-static char* decode_and_copy_component(grpc_exec_ctx* exec_ctx, const char* src,
-                                       size_t begin, size_t end) {
+static char* decode_and_copy_component(const char* src, size_t begin,
+                                       size_t end) {
   grpc_slice component =
       (begin == NOT_SET || end == NOT_SET)
           ? grpc_empty_slice()
@@ -65,8 +65,8 @@ static char* decode_and_copy_component(grpc_exec_ctx* exec_ctx, const char* src,
   grpc_slice decoded_component =
       grpc_permissive_percent_decode_slice(component);
   char* out = grpc_dump_slice(decoded_component, GPR_DUMP_ASCII);
-  grpc_slice_unref_internal(exec_ctx, component);
-  grpc_slice_unref_internal(exec_ctx, decoded_component);
+  grpc_slice_unref_internal(component);
+  grpc_slice_unref_internal(decoded_component);
   return out;
 }
 
@@ -184,8 +184,7 @@ static void parse_query_parts(grpc_uri* uri) {
   }
 }
 
-grpc_uri* grpc_uri_parse(grpc_exec_ctx* exec_ctx, const char* uri_text,
-                         bool suppress_errors) {
+grpc_uri* grpc_uri_parse(const char* uri_text, bool suppress_errors) {
   grpc_uri* uri;
   size_t scheme_begin = 0;
   size_t scheme_end = NOT_SET;
@@ -273,16 +272,13 @@ grpc_uri* grpc_uri_parse(grpc_exec_ctx* exec_ctx, const char* uri_text,
   }
 
   uri = (grpc_uri*)gpr_zalloc(sizeof(*uri));
-  uri->scheme =
-      decode_and_copy_component(exec_ctx, uri_text, scheme_begin, scheme_end);
-  uri->authority = decode_and_copy_component(exec_ctx, uri_text,
-                                             authority_begin, authority_end);
-  uri->path =
-      decode_and_copy_component(exec_ctx, uri_text, path_begin, path_end);
-  uri->query =
-      decode_and_copy_component(exec_ctx, uri_text, query_begin, query_end);
-  uri->fragment = decode_and_copy_component(exec_ctx, uri_text, fragment_begin,
-                                            fragment_end);
+  uri->scheme = decode_and_copy_component(uri_text, scheme_begin, scheme_end);
+  uri->authority =
+      decode_and_copy_component(uri_text, authority_begin, authority_end);
+  uri->path = decode_and_copy_component(uri_text, path_begin, path_end);
+  uri->query = decode_and_copy_component(uri_text, query_begin, query_end);
+  uri->fragment =
+      decode_and_copy_component(uri_text, fragment_begin, fragment_end);
   parse_query_parts(uri);
 
   return uri;

src/core/ext/filters/client_channel/uri_parser.h

@@ -37,8 +37,7 @@ typedef struct {
 } grpc_uri;
 
 /** parse a uri, return NULL on failure */
-grpc_uri* grpc_uri_parse(grpc_exec_ctx* exec_ctx, const char* uri_text,
-                         bool suppress_errors);
+grpc_uri* grpc_uri_parse(const char* uri_text, bool suppress_errors);
 
 /** return the part of a query string after the '=' in "?key=xxx&...", or NULL
  * if key is not present */

src/core/ext/filters/deadline/deadline_filter.cc

@@ -36,18 +36,16 @@
 
 // The on_complete callback used when sending a cancel_error batch down the
 // filter stack.  Yields the call combiner when the batch returns.
-static void yield_call_combiner(grpc_exec_ctx* exec_ctx, void* arg,
-                                grpc_error* ignored) {
+static void yield_call_combiner(void* arg, grpc_error* ignored) {
   grpc_deadline_state* deadline_state = (grpc_deadline_state*)arg;
-  GRPC_CALL_COMBINER_STOP(exec_ctx, deadline_state->call_combiner,
+  GRPC_CALL_COMBINER_STOP(deadline_state->call_combiner,
                           "got on_complete from cancel_stream batch");
-  GRPC_CALL_STACK_UNREF(exec_ctx, deadline_state->call_stack, "deadline_timer");
+  GRPC_CALL_STACK_UNREF(deadline_state->call_stack, "deadline_timer");
 }
 
 // This is called via the call combiner, so access to deadline_state is
 // synchronized.
-static void send_cancel_op_in_call_combiner(grpc_exec_ctx* exec_ctx, void* arg,
-                                            grpc_error* error) {
+static void send_cancel_op_in_call_combiner(void* arg, grpc_error* error) {
   grpc_call_element* elem = (grpc_call_element*)arg;
   grpc_deadline_state* deadline_state = (grpc_deadline_state*)elem->call_data;
   grpc_transport_stream_op_batch* batch = grpc_make_transport_stream_op(
@@ -55,37 +53,34 @@ static void send_cancel_op_in_call_combiner(grpc_exec_ctx* exec_ctx, void* arg,
                         deadline_state, grpc_schedule_on_exec_ctx));
   batch->cancel_stream = true;
   batch->payload->cancel_stream.cancel_error = GRPC_ERROR_REF(error);
-  elem->filter->start_transport_stream_op_batch(exec_ctx, elem, batch);
+  elem->filter->start_transport_stream_op_batch(elem, batch);
 }
 
 // Timer callback.
-static void timer_callback(grpc_exec_ctx* exec_ctx, void* arg,
-                           grpc_error* error) {
+static void timer_callback(void* arg, grpc_error* error) {
   grpc_call_element* elem = (grpc_call_element*)arg;
   grpc_deadline_state* deadline_state = (grpc_deadline_state*)elem->call_data;
   if (error != GRPC_ERROR_CANCELLED) {
     error = grpc_error_set_int(
         GRPC_ERROR_CREATE_FROM_STATIC_STRING("Deadline Exceeded"),
         GRPC_ERROR_INT_GRPC_STATUS, GRPC_STATUS_DEADLINE_EXCEEDED);
-    grpc_call_combiner_cancel(exec_ctx, deadline_state->call_combiner,
+    grpc_call_combiner_cancel(deadline_state->call_combiner,
                               GRPC_ERROR_REF(error));
     GRPC_CLOSURE_INIT(&deadline_state->timer_callback,
                       send_cancel_op_in_call_combiner, elem,
                       grpc_schedule_on_exec_ctx);
-    GRPC_CALL_COMBINER_START(exec_ctx, deadline_state->call_combiner,
+    GRPC_CALL_COMBINER_START(deadline_state->call_combiner,
                              &deadline_state->timer_callback, error,
                              "deadline exceeded -- sending cancel_stream op");
   } else {
-    GRPC_CALL_STACK_UNREF(exec_ctx, deadline_state->call_stack,
-                          "deadline_timer");
+    GRPC_CALL_STACK_UNREF(deadline_state->call_stack, "deadline_timer");
   }
 }
 
 // Starts the deadline timer.
 // This is called via the call combiner, so access to deadline_state is
 // synchronized.
-static void start_timer_if_needed(grpc_exec_ctx* exec_ctx,
-                                  grpc_call_element* elem,
+static void start_timer_if_needed(grpc_call_element* elem,
                                   grpc_millis deadline) {
   if (deadline == GRPC_MILLIS_INF_FUTURE) {
     return;
@@ -113,17 +108,16 @@ static void start_timer_if_needed(grpc_exec_ctx* exec_ctx,
   }
   GPR_ASSERT(closure != nullptr);
   GRPC_CALL_STACK_REF(deadline_state->call_stack, "deadline_timer");
-  grpc_timer_init(exec_ctx, &deadline_state->timer, deadline, closure);
+  grpc_timer_init(&deadline_state->timer, deadline, closure);
 }
 
 // Cancels the deadline timer.
 // This is called via the call combiner, so access to deadline_state is
 // synchronized.
-static void cancel_timer_if_needed(grpc_exec_ctx* exec_ctx,
-                                   grpc_deadline_state* deadline_state) {
+static void cancel_timer_if_needed(grpc_deadline_state* deadline_state) {
   if (deadline_state->timer_state == GRPC_DEADLINE_STATE_PENDING) {
     deadline_state->timer_state = GRPC_DEADLINE_STATE_FINISHED;
-    grpc_timer_cancel(exec_ctx, &deadline_state->timer);
+    grpc_timer_cancel(&deadline_state->timer);
   } else {
     // timer was either in STATE_INITAL (nothing to cancel)
     // OR in STATE_FINISHED (again nothing to cancel)
@@ -131,12 +125,11 @@ static void cancel_timer_if_needed(grpc_exec_ctx* exec_ctx,
 }
 
 // Callback run when the call is complete.
-static void on_complete(grpc_exec_ctx* exec_ctx, void* arg, grpc_error* error) {
+static void on_complete(void* arg, grpc_error* error) {
   grpc_deadline_state* deadline_state = (grpc_deadline_state*)arg;
-  cancel_timer_if_needed(exec_ctx, deadline_state);
+  cancel_timer_if_needed(deadline_state);
   // Invoke the next callback.
-  GRPC_CLOSURE_RUN(exec_ctx, deadline_state->next_on_complete,
-                   GRPC_ERROR_REF(error));
+  GRPC_CLOSURE_RUN(deadline_state->next_on_complete, GRPC_ERROR_REF(error));
 }
 
 // Inject our own on_complete callback into op.
@@ -156,8 +149,7 @@ struct start_timer_after_init_state {
   grpc_millis deadline;
   grpc_closure closure;
 };
-static void start_timer_after_init(grpc_exec_ctx* exec_ctx, void* arg,
-                                   grpc_error* error) {
+static void start_timer_after_init(void* arg, grpc_error* error) {
   struct start_timer_after_init_state* state =
       (struct start_timer_after_init_state*)arg;
   grpc_deadline_state* deadline_state =
@@ -166,18 +158,18 @@ static void start_timer_after_init(grpc_exec_ctx* exec_ctx, void* arg,
     // We are initially called without holding the call combiner, so we
     // need to bounce ourselves into it.
     state->in_call_combiner = true;
-    GRPC_CALL_COMBINER_START(exec_ctx, deadline_state->call_combiner,
-                             &state->closure, GRPC_ERROR_REF(error),
+    GRPC_CALL_COMBINER_START(deadline_state->call_combiner, &state->closure,
+                             GRPC_ERROR_REF(error),
                              "scheduling deadline timer");
     return;
   }
-  start_timer_if_needed(exec_ctx, state->elem, state->deadline);
+  start_timer_if_needed(state->elem, state->deadline);
   gpr_free(state);
-  GRPC_CALL_COMBINER_STOP(exec_ctx, deadline_state->call_combiner,
+  GRPC_CALL_COMBINER_STOP(deadline_state->call_combiner,
                           "done scheduling deadline timer");
 }
 
-void grpc_deadline_state_init(grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
+void grpc_deadline_state_init(grpc_call_element* elem,
                               grpc_call_stack* call_stack,
                               grpc_call_combiner* call_combiner,
                               grpc_millis deadline) {
@@ -200,29 +192,27 @@ void grpc_deadline_state_init(grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
     state->deadline = deadline;
     GRPC_CLOSURE_INIT(&state->closure, start_timer_after_init, state,
                       grpc_schedule_on_exec_ctx);
-    GRPC_CLOSURE_SCHED(exec_ctx, &state->closure, GRPC_ERROR_NONE);
+    GRPC_CLOSURE_SCHED(&state->closure, GRPC_ERROR_NONE);
   }
 }
 
-void grpc_deadline_state_destroy(grpc_exec_ctx* exec_ctx,
-                                 grpc_call_element* elem) {
+void grpc_deadline_state_destroy(grpc_call_element* elem) {
   grpc_deadline_state* deadline_state = (grpc_deadline_state*)elem->call_data;
-  cancel_timer_if_needed(exec_ctx, deadline_state);
+  cancel_timer_if_needed(deadline_state);
 }
 
-void grpc_deadline_state_reset(grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
+void grpc_deadline_state_reset(grpc_call_element* elem,
                                grpc_millis new_deadline) {
   grpc_deadline_state* deadline_state = (grpc_deadline_state*)elem->call_data;
-  cancel_timer_if_needed(exec_ctx, deadline_state);
-  start_timer_if_needed(exec_ctx, elem, new_deadline);
+  cancel_timer_if_needed(deadline_state);
+  start_timer_if_needed(elem, new_deadline);
 }
 
 void grpc_deadline_state_client_start_transport_stream_op_batch(
-    grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
-    grpc_transport_stream_op_batch* op) {
+    grpc_call_element* elem, grpc_transport_stream_op_batch* op) {
   grpc_deadline_state* deadline_state = (grpc_deadline_state*)elem->call_data;
   if (op->cancel_stream) {
-    cancel_timer_if_needed(exec_ctx, deadline_state);
+    cancel_timer_if_needed(deadline_state);
   } else {
     // Make sure we know when the call is complete, so that we can cancel
     // the timer.
@@ -237,16 +227,14 @@ void grpc_deadline_state_client_start_transport_stream_op_batch(
 //
 
 // Constructor for channel_data.  Used for both client and server filters.
-static grpc_error* init_channel_elem(grpc_exec_ctx* exec_ctx,
-                                     grpc_channel_element* elem,
+static grpc_error* init_channel_elem(grpc_channel_element* elem,
                                      grpc_channel_element_args* args) {
   GPR_ASSERT(!args->is_last);
   return GRPC_ERROR_NONE;
 }
 
 // Destructor for channel_data.  Used for both client and server filters.
-static void destroy_channel_elem(grpc_exec_ctx* exec_ctx,
-                                 grpc_channel_element* elem) {}
+static void destroy_channel_elem(grpc_channel_element* elem) {}
 
 // Call data used for both client and server filter.
 typedef struct base_call_data {
@@ -266,50 +254,45 @@ typedef struct server_call_data {
 } server_call_data;
 
 // Constructor for call_data.  Used for both client and server filters.
-static grpc_error* init_call_elem(grpc_exec_ctx* exec_ctx,
-                                  grpc_call_element* elem,
+static grpc_error* init_call_elem(grpc_call_element* elem,
                                   const grpc_call_element_args* args) {
-  grpc_deadline_state_init(exec_ctx, elem, args->call_stack,
-                           args->call_combiner, args->deadline);
+  grpc_deadline_state_init(elem, args->call_stack, args->call_combiner,
+                           args->deadline);
   return GRPC_ERROR_NONE;
 }
 
 // Destructor for call_data.  Used for both client and server filters.
-static void destroy_call_elem(grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
+static void destroy_call_elem(grpc_call_element* elem,
                               const grpc_call_final_info* final_info,
                               grpc_closure* ignored) {
-  grpc_deadline_state_destroy(exec_ctx, elem);
+  grpc_deadline_state_destroy(elem);
 }
 
 // Method for starting a call op for client filter.
 static void client_start_transport_stream_op_batch(
-    grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
-    grpc_transport_stream_op_batch* op) {
-  grpc_deadline_state_client_start_transport_stream_op_batch(exec_ctx, elem,
-                                                             op);
+    grpc_call_element* elem, grpc_transport_stream_op_batch* op) {
+  grpc_deadline_state_client_start_transport_stream_op_batch(elem, op);
   // Chain to next filter.
-  grpc_call_next_op(exec_ctx, elem, op);
+  grpc_call_next_op(elem, op);
 }
 
 // Callback for receiving initial metadata on the server.
-static void recv_initial_metadata_ready(grpc_exec_ctx* exec_ctx, void* arg,
-                                        grpc_error* error) {
+static void recv_initial_metadata_ready(void* arg, grpc_error* error) {
   grpc_call_element* elem = (grpc_call_element*)arg;
   server_call_data* calld = (server_call_data*)elem->call_data;
   // Get deadline from metadata and start the timer if needed.
-  start_timer_if_needed(exec_ctx, elem, calld->recv_initial_metadata->deadline);
+  start_timer_if_needed(elem, calld->recv_initial_metadata->deadline);
   // Invoke the next callback.
   calld->next_recv_initial_metadata_ready->cb(
-      exec_ctx, calld->next_recv_initial_metadata_ready->cb_arg, error);
+      calld->next_recv_initial_metadata_ready->cb_arg, error);
 }
 
 // Method for starting a call op for server filter.
 static void server_start_transport_stream_op_batch(
-    grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
-    grpc_transport_stream_op_batch* op) {
+    grpc_call_element* elem, grpc_transport_stream_op_batch* op) {
   server_call_data* calld = (server_call_data*)elem->call_data;
   if (op->cancel_stream) {
-    cancel_timer_if_needed(exec_ctx, &calld->base.deadline_state);
+    cancel_timer_if_needed(&calld->base.deadline_state);
   } else {
     // If we're receiving initial metadata, we need to get the deadline
     // from the recv_initial_metadata_ready callback.  So we inject our
@@ -335,7 +318,7 @@ static void server_start_transport_stream_op_batch(
     }
   }
   // Chain to next filter.
-  grpc_call_next_op(exec_ctx, elem, op);
+  grpc_call_next_op(elem, op);
 }
 
 const grpc_channel_filter grpc_client_deadline_filter = {
@@ -372,8 +355,7 @@ bool grpc_deadline_checking_enabled(const grpc_channel_args* channel_args) {
       !grpc_channel_args_want_minimal_stack(channel_args));
 }
 
-static bool maybe_add_deadline_filter(grpc_exec_ctx* exec_ctx,
-                                      grpc_channel_stack_builder* builder,
+static bool maybe_add_deadline_filter(grpc_channel_stack_builder* builder,
                                       void* arg) {
   return grpc_deadline_checking_enabled(
              grpc_channel_stack_builder_get_channel_arguments(builder))

src/core/ext/filters/deadline/deadline_filter.h

@@ -49,13 +49,12 @@ typedef struct grpc_deadline_state {
 //
 
 // assumes elem->call_data is zero'd
-void grpc_deadline_state_init(grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
+void grpc_deadline_state_init(grpc_call_element* elem,
                               grpc_call_stack* call_stack,
                               grpc_call_combiner* call_combiner,
                               grpc_millis deadline);
 
-void grpc_deadline_state_destroy(grpc_exec_ctx* exec_ctx,
-                                 grpc_call_element* elem);
+void grpc_deadline_state_destroy(grpc_call_element* elem);
 
 // Cancels the existing timer and starts a new one with new_deadline.
 //
@@ -66,7 +65,7 @@ void grpc_deadline_state_destroy(grpc_exec_ctx* exec_ctx,
 // deadline may result in the timer being called twice.
 //
 // Note: Must be called while holding the call combiner.
-void grpc_deadline_state_reset(grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
+void grpc_deadline_state_reset(grpc_call_element* elem,
                                grpc_millis new_deadline);
 
 // To be called from the client-side filter's start_transport_stream_op_batch()
@@ -78,8 +77,7 @@ void grpc_deadline_state_reset(grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
 //
 // Note: Must be called while holding the call combiner.
 void grpc_deadline_state_client_start_transport_stream_op_batch(
-    grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
-    grpc_transport_stream_op_batch* op);
+    grpc_call_element* elem, grpc_transport_stream_op_batch* op);
 
 // Should deadline checking be performed (according to channel args)
 bool grpc_deadline_checking_enabled(const grpc_channel_args* args);

src/core/ext/filters/http/client/http_client_filter.cc

@@ -68,12 +68,11 @@ typedef struct channel_data {
   size_t max_payload_size_for_get;
 } channel_data;
 
-static grpc_error* client_filter_incoming_metadata(grpc_exec_ctx* exec_ctx,
-                                                   grpc_call_element* elem,
+static grpc_error* client_filter_incoming_metadata(grpc_call_element* elem,
                                                    grpc_metadata_batch* b) {
   if (b->idx.named.status != nullptr) {
     if (grpc_mdelem_eq(b->idx.named.status->md, GRPC_MDELEM_STATUS_200)) {
-      grpc_metadata_batch_remove(exec_ctx, b, b->idx.named.status);
+      grpc_metadata_batch_remove(b, b->idx.named.status);
     } else {
       char* val = grpc_dump_slice(GRPC_MDVALUE(b->idx.named.status->md),
                                   GPR_DUMP_ASCII);
@@ -98,10 +97,9 @@ static grpc_error* client_filter_incoming_metadata(grpc_exec_ctx* exec_ctx,
         GRPC_MDVALUE(b->idx.named.grpc_message->md));
     if (grpc_slice_is_equivalent(pct_decoded_msg,
                                  GRPC_MDVALUE(b->idx.named.grpc_message->md))) {
-      grpc_slice_unref_internal(exec_ctx, pct_decoded_msg);
+      grpc_slice_unref_internal(pct_decoded_msg);
     } else {
-      grpc_metadata_batch_set_value(exec_ctx, b->idx.named.grpc_message,
-                                    pct_decoded_msg);
+      grpc_metadata_batch_set_value(b->idx.named.grpc_message, pct_decoded_msg);
     }
   }
 
@@ -131,60 +129,53 @@ static grpc_error* client_filter_incoming_metadata(grpc_exec_ctx* exec_ctx,
         gpr_free(val);
       }
     }
-    grpc_metadata_batch_remove(exec_ctx, b, b->idx.named.content_type);
+    grpc_metadata_batch_remove(b, b->idx.named.content_type);
   }
 
   return GRPC_ERROR_NONE;
 }
 
-static void recv_initial_metadata_ready(grpc_exec_ctx* exec_ctx,
-                                        void* user_data, grpc_error* error) {
+static void recv_initial_metadata_ready(void* user_data, grpc_error* error) {
   grpc_call_element* elem = (grpc_call_element*)user_data;
   call_data* calld = (call_data*)elem->call_data;
   if (error == GRPC_ERROR_NONE) {
-    error = client_filter_incoming_metadata(exec_ctx, elem,
-                                            calld->recv_initial_metadata);
+    error = client_filter_incoming_metadata(elem, calld->recv_initial_metadata);
   } else {
     GRPC_ERROR_REF(error);
   }
-  GRPC_CLOSURE_RUN(exec_ctx, calld->original_recv_initial_metadata_ready,
-                   error);
+  GRPC_CLOSURE_RUN(calld->original_recv_initial_metadata_ready, error);
 }
 
-static void recv_trailing_metadata_on_complete(grpc_exec_ctx* exec_ctx,
-                                               void* user_data,
+static void recv_trailing_metadata_on_complete(void* user_data,
                                                grpc_error* error) {
   grpc_call_element* elem = (grpc_call_element*)user_data;
   call_data* calld = (call_data*)elem->call_data;
   if (error == GRPC_ERROR_NONE) {
-    error = client_filter_incoming_metadata(exec_ctx, elem,
-                                            calld->recv_trailing_metadata);
+    error =
+        client_filter_incoming_metadata(elem, calld->recv_trailing_metadata);
   } else {
     GRPC_ERROR_REF(error);
   }
-  GRPC_CLOSURE_RUN(exec_ctx, calld->original_recv_trailing_metadata_on_complete,
-                   error);
+  GRPC_CLOSURE_RUN(calld->original_recv_trailing_metadata_on_complete, error);
 }
 
-static void send_message_on_complete(grpc_exec_ctx* exec_ctx, void* arg,
-                                     grpc_error* error) {
+static void send_message_on_complete(void* arg, grpc_error* error) {
   grpc_call_element* elem = (grpc_call_element*)arg;
   call_data* calld = (call_data*)elem->call_data;
-  grpc_byte_stream_cache_destroy(exec_ctx, &calld->send_message_cache);
-  GRPC_CLOSURE_RUN(exec_ctx, calld->original_send_message_on_complete,
+  grpc_byte_stream_cache_destroy(&calld->send_message_cache);
+  GRPC_CLOSURE_RUN(calld->original_send_message_on_complete,
                    GRPC_ERROR_REF(error));
 }
 
 // Pulls a slice from the send_message byte stream, updating
 // calld->send_message_bytes_read.
-static grpc_error* pull_slice_from_send_message(grpc_exec_ctx* exec_ctx,
-                                                call_data* calld) {
+static grpc_error* pull_slice_from_send_message(call_data* calld) {
   grpc_slice incoming_slice;
   grpc_error* error = grpc_byte_stream_pull(
-      exec_ctx, &calld->send_message_caching_stream.base, &incoming_slice);
+      &calld->send_message_caching_stream.base, &incoming_slice);
   if (error == GRPC_ERROR_NONE) {
     calld->send_message_bytes_read += GRPC_SLICE_LENGTH(incoming_slice);
-    grpc_slice_unref_internal(exec_ctx, incoming_slice);
+    grpc_slice_unref_internal(incoming_slice);
   }
   return error;
 }
@@ -194,12 +185,10 @@ static grpc_error* pull_slice_from_send_message(grpc_exec_ctx* exec_ctx,
 // calld->send_message_caching_stream.base.length, then we have completed
 // reading from the byte stream; otherwise, an async read has been dispatched
 // and on_send_message_next_done() will be invoked when it is complete.
-static grpc_error* read_all_available_send_message_data(grpc_exec_ctx* exec_ctx,
-                                                        call_data* calld) {
-  while (grpc_byte_stream_next(exec_ctx,
-                               &calld->send_message_caching_stream.base,
+static grpc_error* read_all_available_send_message_data(call_data* calld) {
+  while (grpc_byte_stream_next(&calld->send_message_caching_stream.base,
                                ~(size_t)0, &calld->on_send_message_next_done)) {
-    grpc_error* error = pull_slice_from_send_message(exec_ctx, calld);
+    grpc_error* error = pull_slice_from_send_message(calld);
     if (error != GRPC_ERROR_NONE) return error;
     if (calld->send_message_bytes_read ==
         calld->send_message_caching_stream.base.length) {
@@ -210,19 +199,18 @@ static grpc_error* read_all_available_send_message_data(grpc_exec_ctx* exec_ctx,
 }
 
 // Async callback for grpc_byte_stream_next().
-static void on_send_message_next_done(grpc_exec_ctx* exec_ctx, void* arg,
-                                      grpc_error* error) {
+static void on_send_message_next_done(void* arg, grpc_error* error) {
   grpc_call_element* elem = (grpc_call_element*)arg;
   call_data* calld = (call_data*)elem->call_data;
   if (error != GRPC_ERROR_NONE) {
     grpc_transport_stream_op_batch_finish_with_failure(
-        exec_ctx, calld->send_message_batch, error, calld->call_combiner);
+        calld->send_message_batch, error, calld->call_combiner);
     return;
   }
-  error = pull_slice_from_send_message(exec_ctx, calld);
+  error = pull_slice_from_send_message(calld);
   if (error != GRPC_ERROR_NONE) {
     grpc_transport_stream_op_batch_finish_with_failure(
-        exec_ctx, calld->send_message_batch, error, calld->call_combiner);
+        calld->send_message_batch, error, calld->call_combiner);
     return;
   }
   // There may or may not be more to read, but we don't care.  If we got
@@ -230,7 +218,7 @@ static void on_send_message_next_done(grpc_exec_ctx* exec_ctx, void* arg,
   // synchronously, so we were not able to do a cached call.  Instead,
   // we just reset the byte stream and then send down the batch as-is.
   grpc_caching_byte_stream_reset(&calld->send_message_caching_stream);
-  grpc_call_next_op(exec_ctx, elem, calld->send_message_batch);
+  grpc_call_next_op(elem, calld->send_message_batch);
 }
 
 static char* slice_buffer_to_string(grpc_slice_buffer* slice_buffer) {
@@ -248,8 +236,7 @@ static char* slice_buffer_to_string(grpc_slice_buffer* slice_buffer) {
 
 // Modifies the path entry in the batch's send_initial_metadata to
 // append the base64-encoded query for a GET request.
-static grpc_error* update_path_for_get(grpc_exec_ctx* exec_ctx,
-                                       grpc_call_element* elem,
+static grpc_error* update_path_for_get(grpc_call_element* elem,
                                        grpc_transport_stream_op_batch* batch) {
   call_data* calld = (call_data*)elem->call_data;
   grpc_slice path_slice =
@@ -282,24 +269,22 @@ static grpc_error* update_path_for_get(grpc_exec_ctx* exec_ctx,
       grpc_slice_sub_no_ref(path_with_query_slice, 0, strlen(t));
   /* substitute previous path with the new path+query */
   grpc_mdelem mdelem_path_and_query =
-      grpc_mdelem_from_slices(exec_ctx, GRPC_MDSTR_PATH, path_with_query_slice);
+      grpc_mdelem_from_slices(GRPC_MDSTR_PATH, path_with_query_slice);
   grpc_metadata_batch* b =
       batch->payload->send_initial_metadata.send_initial_metadata;
-  return grpc_metadata_batch_substitute(exec_ctx, b, b->idx.named.path,
+  return grpc_metadata_batch_substitute(b, b->idx.named.path,
                                         mdelem_path_and_query);
 }
 
-static void remove_if_present(grpc_exec_ctx* exec_ctx,
-                              grpc_metadata_batch* batch,
+static void remove_if_present(grpc_metadata_batch* batch,
                               grpc_metadata_batch_callouts_index idx) {
   if (batch->idx.array[idx] != nullptr) {
-    grpc_metadata_batch_remove(exec_ctx, batch, batch->idx.array[idx]);
+    grpc_metadata_batch_remove(batch, batch->idx.array[idx]);
   }
 }
 
 static void hc_start_transport_stream_op_batch(
-    grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
-    grpc_transport_stream_op_batch* batch) {
+    grpc_call_element* elem, grpc_transport_stream_op_batch* batch) {
   call_data* calld = (call_data*)elem->call_data;
   channel_data* channeld = (channel_data*)elem->channel_data;
   GPR_TIMER_BEGIN("hc_start_transport_stream_op_batch", 0);
@@ -345,17 +330,16 @@ static void hc_start_transport_stream_op_batch(
       calld->original_send_message_on_complete = batch->on_complete;
       batch->on_complete = &calld->send_message_on_complete;
       calld->send_message_batch = batch;
-      error = read_all_available_send_message_data(exec_ctx, calld);
+      error = read_all_available_send_message_data(calld);
       if (error != GRPC_ERROR_NONE) goto done;
       // If all the data has been read, then we can use GET.
       if (calld->send_message_bytes_read ==
           calld->send_message_caching_stream.base.length) {
         method = GRPC_MDELEM_METHOD_GET;
-        error = update_path_for_get(exec_ctx, elem, batch);
+        error = update_path_for_get(elem, batch);
         if (error != GRPC_ERROR_NONE) goto done;
         batch->send_message = false;
-        grpc_byte_stream_destroy(exec_ctx,
-                                 &calld->send_message_caching_stream.base);
+        grpc_byte_stream_destroy(&calld->send_message_caching_stream.base);
       } else {
         // Not all data is available.  The batch will be sent down
         // asynchronously in on_send_message_next_done().
@@ -372,41 +356,41 @@ static void hc_start_transport_stream_op_batch(
     }
 
     remove_if_present(
-        exec_ctx, batch->payload->send_initial_metadata.send_initial_metadata,
+        batch->payload->send_initial_metadata.send_initial_metadata,
         GRPC_BATCH_METHOD);
     remove_if_present(
-        exec_ctx, batch->payload->send_initial_metadata.send_initial_metadata,
+        batch->payload->send_initial_metadata.send_initial_metadata,
         GRPC_BATCH_SCHEME);
     remove_if_present(
-        exec_ctx, batch->payload->send_initial_metadata.send_initial_metadata,
+        batch->payload->send_initial_metadata.send_initial_metadata,
         GRPC_BATCH_TE);
     remove_if_present(
-        exec_ctx, batch->payload->send_initial_metadata.send_initial_metadata,
+        batch->payload->send_initial_metadata.send_initial_metadata,
         GRPC_BATCH_CONTENT_TYPE);
     remove_if_present(
-        exec_ctx, batch->payload->send_initial_metadata.send_initial_metadata,
+        batch->payload->send_initial_metadata.send_initial_metadata,
         GRPC_BATCH_USER_AGENT);
 
     /* Send : prefixed headers, which have to be before any application
        layer headers. */
     error = grpc_metadata_batch_add_head(
-        exec_ctx, batch->payload->send_initial_metadata.send_initial_metadata,
+        batch->payload->send_initial_metadata.send_initial_metadata,
         &calld->method, method);
     if (error != GRPC_ERROR_NONE) goto done;
     error = grpc_metadata_batch_add_head(
-        exec_ctx, batch->payload->send_initial_metadata.send_initial_metadata,
+        batch->payload->send_initial_metadata.send_initial_metadata,
         &calld->scheme, channeld->static_scheme);
     if (error != GRPC_ERROR_NONE) goto done;
     error = grpc_metadata_batch_add_tail(
-        exec_ctx, batch->payload->send_initial_metadata.send_initial_metadata,
+        batch->payload->send_initial_metadata.send_initial_metadata,
         &calld->te_trailers, GRPC_MDELEM_TE_TRAILERS);
     if (error != GRPC_ERROR_NONE) goto done;
     error = grpc_metadata_batch_add_tail(
-        exec_ctx, batch->payload->send_initial_metadata.send_initial_metadata,
+        batch->payload->send_initial_metadata.send_initial_metadata,
         &calld->content_type, GRPC_MDELEM_CONTENT_TYPE_APPLICATION_SLASH_GRPC);
     if (error != GRPC_ERROR_NONE) goto done;
     error = grpc_metadata_batch_add_tail(
-        exec_ctx, batch->payload->send_initial_metadata.send_initial_metadata,
+        batch->payload->send_initial_metadata.send_initial_metadata,
         &calld->user_agent, GRPC_MDELEM_REF(channeld->user_agent));
     if (error != GRPC_ERROR_NONE) goto done;
   }
@@ -414,16 +398,15 @@ static void hc_start_transport_stream_op_batch(
 done:
   if (error != GRPC_ERROR_NONE) {
     grpc_transport_stream_op_batch_finish_with_failure(
-        exec_ctx, calld->send_message_batch, error, calld->call_combiner);
+        calld->send_message_batch, error, calld->call_combiner);
   } else if (!batch_will_be_handled_asynchronously) {
-    grpc_call_next_op(exec_ctx, elem, batch);
+    grpc_call_next_op(elem, batch);
   }
   GPR_TIMER_END("hc_start_transport_stream_op_batch", 0);
 }
 
 /* Constructor for call_data */
-static grpc_error* init_call_elem(grpc_exec_ctx* exec_ctx,
-                                  grpc_call_element* elem,
+static grpc_error* init_call_elem(grpc_call_element* elem,
                                   const grpc_call_element_args* args) {
   call_data* calld = (call_data*)elem->call_data;
   calld->call_combiner = args->call_combiner;
@@ -441,7 +424,7 @@ static grpc_error* init_call_elem(grpc_exec_ctx* exec_ctx,
 }
 
 /* Destructor for call_data */
-static void destroy_call_elem(grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
+static void destroy_call_elem(grpc_call_element* elem,
                               const grpc_call_final_info* final_info,
                               grpc_closure* ignored) {}
 
@@ -533,8 +516,7 @@ static grpc_slice user_agent_from_args(const grpc_channel_args* args,
 }
 
 /* Constructor for channel_data */
-static grpc_error* init_channel_elem(grpc_exec_ctx* exec_ctx,
-                                     grpc_channel_element* elem,
+static grpc_error* init_channel_elem(grpc_channel_element* elem,
                                      grpc_channel_element_args* args) {
   channel_data* chand = (channel_data*)elem->channel_data;
   GPR_ASSERT(!args->is_last);
@@ -543,17 +525,16 @@ static grpc_error* init_channel_elem(grpc_exec_ctx* exec_ctx,
   chand->max_payload_size_for_get =
       max_payload_size_from_args(args->channel_args);
   chand->user_agent = grpc_mdelem_from_slices(
-      exec_ctx, GRPC_MDSTR_USER_AGENT,
+      GRPC_MDSTR_USER_AGENT,
       user_agent_from_args(args->channel_args,
                            args->optional_transport->vtable->name));
   return GRPC_ERROR_NONE;
 }
 
 /* Destructor for channel data */
-static void destroy_channel_elem(grpc_exec_ctx* exec_ctx,
-                                 grpc_channel_element* elem) {
+static void destroy_channel_elem(grpc_channel_element* elem) {
   channel_data* chand = (channel_data*)elem->channel_data;
-  GRPC_MDELEM_UNREF(exec_ctx, chand->user_agent);
+  GRPC_MDELEM_UNREF(chand->user_agent);
 }
 
 const grpc_channel_filter grpc_http_client_filter = {

src/core/ext/filters/http/http_filters_plugin.cc

@@ -40,8 +40,7 @@ static bool is_building_http_like_transport(
   return t != nullptr && strstr(t->vtable->name, "http");
 }
 
-static bool maybe_add_optional_filter(grpc_exec_ctx* exec_ctx,
-                                      grpc_channel_stack_builder* builder,
+static bool maybe_add_optional_filter(grpc_channel_stack_builder* builder,
                                       void* arg) {
   if (!is_building_http_like_transport(builder)) return true;
   optional_filter* filtarg = (optional_filter*)arg;
@@ -55,8 +54,7 @@ static bool maybe_add_optional_filter(grpc_exec_ctx* exec_ctx,
                 : true;
 }
 
-static bool maybe_add_required_filter(grpc_exec_ctx* exec_ctx,
-                                      grpc_channel_stack_builder* builder,
+static bool maybe_add_required_filter(grpc_channel_stack_builder* builder,
                                       void* arg) {
   return is_building_http_like_transport(builder)
              ? grpc_channel_stack_builder_prepend_filter(

src/core/ext/filters/http/message_compress/message_compress_filter.cc

@@ -100,12 +100,11 @@ static bool skip_compression(grpc_call_element* elem, uint32_t flags,
 
 /** Filter initial metadata */
 static grpc_error* process_send_initial_metadata(
-    grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
-    grpc_metadata_batch* initial_metadata,
+    grpc_call_element* elem, grpc_metadata_batch* initial_metadata,
     bool* has_compression_algorithm) GRPC_MUST_USE_RESULT;
 static grpc_error* process_send_initial_metadata(
-    grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
-    grpc_metadata_batch* initial_metadata, bool* has_compression_algorithm) {
+    grpc_call_element* elem, grpc_metadata_batch* initial_metadata,
+    bool* has_compression_algorithm) {
   call_data* calld = (call_data*)elem->call_data;
   channel_data* channeld = (channel_data*)elem->channel_data;
   *has_compression_algorithm = false;
@@ -137,13 +136,13 @@ static grpc_error* process_send_initial_metadata(
     }
     *has_compression_algorithm = true;
     grpc_metadata_batch_remove(
-        exec_ctx, initial_metadata,
+        initial_metadata,
         initial_metadata->idx.named.grpc_internal_stream_encoding_request);
     /* Disable message-wise compression */
     calld->compression_algorithm = GRPC_COMPRESS_NONE;
     if (initial_metadata->idx.named.grpc_internal_encoding_request != nullptr) {
       grpc_metadata_batch_remove(
-          exec_ctx, initial_metadata,
+          initial_metadata,
           initial_metadata->idx.named.grpc_internal_encoding_request);
     }
   } else if (initial_metadata->idx.named.grpc_internal_encoding_request !=
@@ -160,7 +159,7 @@ static grpc_error* process_send_initial_metadata(
     }
     *has_compression_algorithm = true;
     grpc_metadata_batch_remove(
-        exec_ctx, initial_metadata,
+        initial_metadata,
         initial_metadata->idx.named.grpc_internal_encoding_request);
   } else {
     /* If no algorithm was found in the metadata and we aren't
@@ -181,12 +180,11 @@ static grpc_error* process_send_initial_metadata(
   /* hint compression algorithm */
   if (stream_compression_algorithm != GRPC_STREAM_COMPRESS_NONE) {
     error = grpc_metadata_batch_add_tail(
-        exec_ctx, initial_metadata,
-        &calld->stream_compression_algorithm_storage,
+        initial_metadata, &calld->stream_compression_algorithm_storage,
         grpc_stream_compression_encoding_mdelem(stream_compression_algorithm));
   } else if (calld->compression_algorithm != GRPC_COMPRESS_NONE) {
     error = grpc_metadata_batch_add_tail(
-        exec_ctx, initial_metadata, &calld->compression_algorithm_storage,
+        initial_metadata, &calld->compression_algorithm_storage,
         grpc_compression_encoding_mdelem(calld->compression_algorithm));
   }
 
@@ -194,7 +192,7 @@ static grpc_error* process_send_initial_metadata(
 
   /* convey supported compression algorithms */
   error = grpc_metadata_batch_add_tail(
-      exec_ctx, initial_metadata, &calld->accept_encoding_storage,
+      initial_metadata, &calld->accept_encoding_storage,
       GRPC_MDELEM_ACCEPT_ENCODING_FOR_ALGORITHMS(
           channeld->supported_compression_algorithms));
 
@@ -203,7 +201,7 @@ static grpc_error* process_send_initial_metadata(
   /* Do not overwrite accept-encoding header if it already presents. */
   if (!initial_metadata->idx.named.accept_encoding) {
     error = grpc_metadata_batch_add_tail(
-        exec_ctx, initial_metadata, &calld->accept_stream_encoding_storage,
+        initial_metadata, &calld->accept_stream_encoding_storage,
         GRPC_MDELEM_ACCEPT_STREAM_ENCODING_FOR_ALGORITHMS(
             channeld->supported_stream_compression_algorithms));
   }
@@ -211,17 +209,15 @@ static grpc_error* process_send_initial_metadata(
   return error;
 }
 
-static void send_message_on_complete(grpc_exec_ctx* exec_ctx, void* arg,
-                                     grpc_error* error) {
+static void send_message_on_complete(void* arg, grpc_error* error) {
   grpc_call_element* elem = (grpc_call_element*)arg;
   call_data* calld = (call_data*)elem->call_data;
-  grpc_slice_buffer_reset_and_unref_internal(exec_ctx, &calld->slices);
-  GRPC_CLOSURE_RUN(exec_ctx, calld->original_send_message_on_complete,
+  grpc_slice_buffer_reset_and_unref_internal(&calld->slices);
+  GRPC_CLOSURE_RUN(calld->original_send_message_on_complete,
                    GRPC_ERROR_REF(error));
 }
 
-static void send_message_batch_continue(grpc_exec_ctx* exec_ctx,
-                                        grpc_call_element* elem) {
+static void send_message_batch_continue(grpc_call_element* elem) {
   call_data* calld = (call_data*)elem->call_data;
   // Note: The call to grpc_call_next_op() results in yielding the
   // call combiner, so we need to clear calld->send_message_batch
@@ -229,19 +225,18 @@ static void send_message_batch_continue(grpc_exec_ctx* exec_ctx,
   grpc_transport_stream_op_batch* send_message_batch =
       calld->send_message_batch;
   calld->send_message_batch = nullptr;
-  grpc_call_next_op(exec_ctx, elem, send_message_batch);
+  grpc_call_next_op(elem, send_message_batch);
 }
 
-static void finish_send_message(grpc_exec_ctx* exec_ctx,
-                                grpc_call_element* elem) {
+static void finish_send_message(grpc_call_element* elem) {
   call_data* calld = (call_data*)elem->call_data;
   // Compress the data if appropriate.
   grpc_slice_buffer tmp;
   grpc_slice_buffer_init(&tmp);
   uint32_t send_flags =
       calld->send_message_batch->payload->send_message.send_message->flags;
-  bool did_compress = grpc_msg_compress(exec_ctx, calld->compression_algorithm,
-                                        &calld->slices, &tmp);
+  bool did_compress =
+      grpc_msg_compress(calld->compression_algorithm, &calld->slices, &tmp);
   if (did_compress) {
     if (grpc_compression_trace.enabled()) {
       const char* algo_name;
@@ -268,11 +263,11 @@ static void finish_send_message(grpc_exec_ctx* exec_ctx,
               algo_name, calld->slices.length);
     }
   }
-  grpc_slice_buffer_destroy_internal(exec_ctx, &tmp);
+  grpc_slice_buffer_destroy_internal(&tmp);
   // Swap out the original byte stream with our new one and send the
   // batch down.
   grpc_byte_stream_destroy(
-      exec_ctx, calld->send_message_batch->payload->send_message.send_message);
+      calld->send_message_batch->payload->send_message.send_message);
   grpc_slice_buffer_stream_init(&calld->replacement_stream, &calld->slices,
                                 send_flags);
   calld->send_message_batch->payload->send_message.send_message =
@@ -280,27 +275,24 @@ static void finish_send_message(grpc_exec_ctx* exec_ctx,
   calld->original_send_message_on_complete =
       calld->send_message_batch->on_complete;
   calld->send_message_batch->on_complete = &calld->send_message_on_complete;
-  send_message_batch_continue(exec_ctx, elem);
+  send_message_batch_continue(elem);
 }
 
-static void fail_send_message_batch_in_call_combiner(grpc_exec_ctx* exec_ctx,
-                                                     void* arg,
+static void fail_send_message_batch_in_call_combiner(void* arg,
                                                      grpc_error* error) {
   call_data* calld = (call_data*)arg;
   if (calld->send_message_batch != nullptr) {
     grpc_transport_stream_op_batch_finish_with_failure(
-        exec_ctx, calld->send_message_batch, GRPC_ERROR_REF(error),
-        calld->call_combiner);
+        calld->send_message_batch, GRPC_ERROR_REF(error), calld->call_combiner);
     calld->send_message_batch = nullptr;
   }
 }
 
 // Pulls a slice from the send_message byte stream and adds it to calld->slices.
-static grpc_error* pull_slice_from_send_message(grpc_exec_ctx* exec_ctx,
-                                                call_data* calld) {
+static grpc_error* pull_slice_from_send_message(call_data* calld) {
   grpc_slice incoming_slice;
   grpc_error* error = grpc_byte_stream_pull(
-      exec_ctx, calld->send_message_batch->payload->send_message.send_message,
+      calld->send_message_batch->payload->send_message.send_message,
       &incoming_slice);
   if (error == GRPC_ERROR_NONE) {
     grpc_slice_buffer_add(&calld->slices, incoming_slice);
@@ -312,69 +304,65 @@ static grpc_error* pull_slice_from_send_message(grpc_exec_ctx* exec_ctx,
 // If all data has been read, invokes finish_send_message().  Otherwise,
 // an async call to grpc_byte_stream_next() has been started, which will
 // eventually result in calling on_send_message_next_done().
-static void continue_reading_send_message(grpc_exec_ctx* exec_ctx,
-                                          grpc_call_element* elem) {
+static void continue_reading_send_message(grpc_call_element* elem) {
   call_data* calld = (call_data*)elem->call_data;
   while (grpc_byte_stream_next(
-      exec_ctx, calld->send_message_batch->payload->send_message.send_message,
-      ~(size_t)0, &calld->on_send_message_next_done)) {
-    grpc_error* error = pull_slice_from_send_message(exec_ctx, calld);
+      calld->send_message_batch->payload->send_message.send_message, ~(size_t)0,
+      &calld->on_send_message_next_done)) {
+    grpc_error* error = pull_slice_from_send_message(calld);
     if (error != GRPC_ERROR_NONE) {
       // Closure callback; does not take ownership of error.
-      fail_send_message_batch_in_call_combiner(exec_ctx, calld, error);
+      fail_send_message_batch_in_call_combiner(calld, error);
       GRPC_ERROR_UNREF(error);
       return;
     }
     if (calld->slices.length ==
         calld->send_message_batch->payload->send_message.send_message->length) {
-      finish_send_message(exec_ctx, elem);
+      finish_send_message(elem);
       break;
     }
   }
 }
 
 // Async callback for grpc_byte_stream_next().
-static void on_send_message_next_done(grpc_exec_ctx* exec_ctx, void* arg,
-                                      grpc_error* error) {
+static void on_send_message_next_done(void* arg, grpc_error* error) {
   grpc_call_element* elem = (grpc_call_element*)arg;
   call_data* calld = (call_data*)elem->call_data;
   if (error != GRPC_ERROR_NONE) {
     // Closure callback; does not take ownership of error.
-    fail_send_message_batch_in_call_combiner(exec_ctx, calld, error);
+    fail_send_message_batch_in_call_combiner(calld, error);
     return;
   }
-  error = pull_slice_from_send_message(exec_ctx, calld);
+  error = pull_slice_from_send_message(calld);
   if (error != GRPC_ERROR_NONE) {
     // Closure callback; does not take ownership of error.
-    fail_send_message_batch_in_call_combiner(exec_ctx, calld, error);
+    fail_send_message_batch_in_call_combiner(calld, error);
     GRPC_ERROR_UNREF(error);
     return;
   }
   if (calld->slices.length ==
       calld->send_message_batch->payload->send_message.send_message->length) {
-    finish_send_message(exec_ctx, elem);
+    finish_send_message(elem);
   } else {
-    continue_reading_send_message(exec_ctx, elem);
+    continue_reading_send_message(elem);
   }
 }
 
-static void start_send_message_batch(grpc_exec_ctx* exec_ctx, void* arg,
-                                     grpc_error* unused) {
+static void start_send_message_batch(void* arg, grpc_error* unused) {
   grpc_call_element* elem = (grpc_call_element*)arg;
   call_data* calld = (call_data*)elem->call_data;
   if (skip_compression(
           elem,
           calld->send_message_batch->payload->send_message.send_message->flags,
           calld->send_initial_metadata_state == HAS_COMPRESSION_ALGORITHM)) {
-    send_message_batch_continue(exec_ctx, elem);
+    send_message_batch_continue(elem);
   } else {
-    continue_reading_send_message(exec_ctx, elem);
+    continue_reading_send_message(elem);
   }
 }
 
 static void compress_start_transport_stream_op_batch(
-    grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
-    grpc_transport_stream_op_batch* batch) {
+    grpc_call_element* elem, grpc_transport_stream_op_batch* batch) {
   call_data* calld = (call_data*)elem->call_data;
   GPR_TIMER_BEGIN("compress_start_transport_stream_op_batch", 0);
   // Handle cancel_stream.
@@ -385,21 +373,19 @@ static void compress_start_transport_stream_op_batch(
     if (calld->send_message_batch != nullptr) {
       if (calld->send_initial_metadata_state == INITIAL_METADATA_UNSEEN) {
         GRPC_CALL_COMBINER_START(
-            exec_ctx, calld->call_combiner,
+            calld->call_combiner,
             GRPC_CLOSURE_CREATE(fail_send_message_batch_in_call_combiner, calld,
                                 grpc_schedule_on_exec_ctx),
             GRPC_ERROR_REF(calld->cancel_error), "failing send_message op");
       } else {
         grpc_byte_stream_shutdown(
-            exec_ctx,
             calld->send_message_batch->payload->send_message.send_message,
             GRPC_ERROR_REF(calld->cancel_error));
       }
     }
   } else if (calld->cancel_error != GRPC_ERROR_NONE) {
     grpc_transport_stream_op_batch_finish_with_failure(
-        exec_ctx, batch, GRPC_ERROR_REF(calld->cancel_error),
-        calld->call_combiner);
+        batch, GRPC_ERROR_REF(calld->cancel_error), calld->call_combiner);
     goto done;
   }
   // Handle send_initial_metadata.
@@ -407,11 +393,10 @@ static void compress_start_transport_stream_op_batch(
     GPR_ASSERT(calld->send_initial_metadata_state == INITIAL_METADATA_UNSEEN);
     bool has_compression_algorithm;
     grpc_error* error = process_send_initial_metadata(
-        exec_ctx, elem,
-        batch->payload->send_initial_metadata.send_initial_metadata,
+        elem, batch->payload->send_initial_metadata.send_initial_metadata,
         &has_compression_algorithm);
     if (error != GRPC_ERROR_NONE) {
-      grpc_transport_stream_op_batch_finish_with_failure(exec_ctx, batch, error,
+      grpc_transport_stream_op_batch_finish_with_failure(batch, error,
                                                          calld->call_combiner);
       goto done;
     }
@@ -425,7 +410,7 @@ static void compress_start_transport_stream_op_batch(
     // the call stack) will release the call combiner for each batch it sees.
     if (calld->send_message_batch != nullptr) {
       GRPC_CALL_COMBINER_START(
-          exec_ctx, calld->call_combiner,
+          calld->call_combiner,
           &calld->start_send_message_batch_in_call_combiner, GRPC_ERROR_NONE,
           "starting send_message after send_initial_metadata");
     }
@@ -440,22 +425,21 @@ static void compress_start_transport_stream_op_batch(
     // send_initial_metadata.
     if (calld->send_initial_metadata_state == INITIAL_METADATA_UNSEEN) {
       GRPC_CALL_COMBINER_STOP(
-          exec_ctx, calld->call_combiner,
+          calld->call_combiner,
           "send_message batch pending send_initial_metadata");
       goto done;
     }
-    start_send_message_batch(exec_ctx, elem, GRPC_ERROR_NONE);
+    start_send_message_batch(elem, GRPC_ERROR_NONE);
   } else {
     // Pass control down the stack.
-    grpc_call_next_op(exec_ctx, elem, batch);
+    grpc_call_next_op(elem, batch);
   }
 done:
   GPR_TIMER_END("compress_start_transport_stream_op_batch", 0);
 }
 
 /* Constructor for call_data */
-static grpc_error* init_call_elem(grpc_exec_ctx* exec_ctx,
-                                  grpc_call_element* elem,
+static grpc_error* init_call_elem(grpc_call_element* elem,
                                   const grpc_call_element_args* args) {
   call_data* calld = (call_data*)elem->call_data;
   calld->call_combiner = args->call_combiner;
@@ -471,17 +455,16 @@ static grpc_error* init_call_elem(grpc_exec_ctx* exec_ctx,
 }
 
 /* Destructor for call_data */
-static void destroy_call_elem(grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
+static void destroy_call_elem(grpc_call_element* elem,
                               const grpc_call_final_info* final_info,
                               grpc_closure* ignored) {
   call_data* calld = (call_data*)elem->call_data;
-  grpc_slice_buffer_destroy_internal(exec_ctx, &calld->slices);
+  grpc_slice_buffer_destroy_internal(&calld->slices);
   GRPC_ERROR_UNREF(calld->cancel_error);
 }
 
 /* Constructor for channel_data */
-static grpc_error* init_channel_elem(grpc_exec_ctx* exec_ctx,
-                                     grpc_channel_element* elem,
+static grpc_error* init_channel_elem(grpc_channel_element* elem,
                                      grpc_channel_element_args* args) {
   channel_data* channeld = (channel_data*)elem->channel_data;
 
@@ -531,8 +514,7 @@ static grpc_error* init_channel_elem(grpc_exec_ctx* exec_ctx,
 }
 
 /* Destructor for channel data */
-static void destroy_channel_elem(grpc_exec_ctx* exec_ctx,
-                                 grpc_channel_element* elem) {}
+static void destroy_channel_elem(grpc_channel_element* elem) {}
 
 const grpc_channel_filter grpc_message_compress_filter = {
     compress_start_transport_stream_op_batch,

src/core/ext/filters/http/server/http_server_filter.cc

@@ -66,8 +66,7 @@ typedef struct channel_data {
   uint8_t unused;
 } channel_data;
 
-static grpc_error* server_filter_outgoing_metadata(grpc_exec_ctx* exec_ctx,
-                                                   grpc_call_element* elem,
+static grpc_error* server_filter_outgoing_metadata(grpc_call_element* elem,
                                                    grpc_metadata_batch* b) {
   if (b->idx.named.grpc_message != nullptr) {
     grpc_slice pct_encoded_msg = grpc_percent_encode_slice(
@@ -75,10 +74,9 @@ static grpc_error* server_filter_outgoing_metadata(grpc_exec_ctx* exec_ctx,
         grpc_compatible_percent_encoding_unreserved_bytes);
     if (grpc_slice_is_equivalent(pct_encoded_msg,
                                  GRPC_MDVALUE(b->idx.named.grpc_message->md))) {
-      grpc_slice_unref_internal(exec_ctx, pct_encoded_msg);
+      grpc_slice_unref_internal(pct_encoded_msg);
     } else {
-      grpc_metadata_batch_set_value(exec_ctx, b->idx.named.grpc_message,
-                                    pct_encoded_msg);
+      grpc_metadata_batch_set_value(b->idx.named.grpc_message, pct_encoded_msg);
     }
   }
   return GRPC_ERROR_NONE;
@@ -93,8 +91,7 @@ static void add_error(const char* error_name, grpc_error** cumulative,
   *cumulative = grpc_error_add_child(*cumulative, new_err);
 }
 
-static grpc_error* server_filter_incoming_metadata(grpc_exec_ctx* exec_ctx,
-                                                   grpc_call_element* elem,
+static grpc_error* server_filter_incoming_metadata(grpc_call_element* elem,
                                                    grpc_metadata_batch* b) {
   call_data* calld = (call_data*)elem->call_data;
   grpc_error* error = GRPC_ERROR_NONE;
@@ -123,7 +120,7 @@ static grpc_error* server_filter_incoming_metadata(grpc_exec_ctx* exec_ctx,
                     GRPC_ERROR_CREATE_FROM_STATIC_STRING("Bad header"),
                     b->idx.named.method->md));
     }
-    grpc_metadata_batch_remove(exec_ctx, b, b->idx.named.method);
+    grpc_metadata_batch_remove(b, b->idx.named.method);
   } else {
     add_error(
         error_name, &error,
@@ -139,7 +136,7 @@ static grpc_error* server_filter_incoming_metadata(grpc_exec_ctx* exec_ctx,
                     GRPC_ERROR_CREATE_FROM_STATIC_STRING("Bad header"),
                     b->idx.named.te->md));
     }
-    grpc_metadata_batch_remove(exec_ctx, b, b->idx.named.te);
+    grpc_metadata_batch_remove(b, b->idx.named.te);
   } else {
     add_error(error_name, &error,
               grpc_error_set_str(
@@ -156,7 +153,7 @@ static grpc_error* server_filter_incoming_metadata(grpc_exec_ctx* exec_ctx,
                     GRPC_ERROR_CREATE_FROM_STATIC_STRING("Bad header"),
                     b->idx.named.scheme->md));
     }
-    grpc_metadata_batch_remove(exec_ctx, b, b->idx.named.scheme);
+    grpc_metadata_batch_remove(b, b->idx.named.scheme);
   } else {
     add_error(
         error_name, &error,
@@ -191,7 +188,7 @@ static grpc_error* server_filter_incoming_metadata(grpc_exec_ctx* exec_ctx,
         gpr_free(val);
       }
     }
-    grpc_metadata_batch_remove(exec_ctx, b, b->idx.named.content_type);
+    grpc_metadata_batch_remove(b, b->idx.named.content_type);
   }
 
   if (b->idx.named.path == nullptr) {
@@ -218,22 +215,21 @@ static grpc_error* server_filter_incoming_metadata(grpc_exec_ctx* exec_ctx,
 
       /* substitute path metadata with just the path (not query) */
       grpc_mdelem mdelem_path_without_query = grpc_mdelem_from_slices(
-          exec_ctx, GRPC_MDSTR_PATH, grpc_slice_sub(path_slice, 0, offset));
+          GRPC_MDSTR_PATH, grpc_slice_sub(path_slice, 0, offset));
 
-      grpc_metadata_batch_substitute(exec_ctx, b, b->idx.named.path,
+      grpc_metadata_batch_substitute(b, b->idx.named.path,
                                      mdelem_path_without_query);
 
       /* decode payload from query and add to the slice buffer to be returned */
       const int k_url_safe = 1;
-      grpc_slice_buffer_add(
-          &calld->read_slice_buffer,
-          grpc_base64_decode_with_len(
-              exec_ctx, (const char*)GRPC_SLICE_START_PTR(query_slice),
-              GRPC_SLICE_LENGTH(query_slice), k_url_safe));
+      grpc_slice_buffer_add(&calld->read_slice_buffer,
+                            grpc_base64_decode_with_len(
+                                (const char*)GRPC_SLICE_START_PTR(query_slice),
+                                GRPC_SLICE_LENGTH(query_slice), k_url_safe));
       grpc_slice_buffer_stream_init(&calld->read_stream,
                                     &calld->read_slice_buffer, 0);
       calld->seen_path_with_query = true;
-      grpc_slice_unref_internal(exec_ctx, query_slice);
+      grpc_slice_unref_internal(query_slice);
     } else {
       gpr_log(GPR_ERROR, "GET request without QUERY");
     }
@@ -242,14 +238,14 @@ static grpc_error* server_filter_incoming_metadata(grpc_exec_ctx* exec_ctx,
   if (b->idx.named.host != nullptr && b->idx.named.authority == nullptr) {
     grpc_linked_mdelem* el = b->idx.named.host;
     grpc_mdelem md = GRPC_MDELEM_REF(el->md);
-    grpc_metadata_batch_remove(exec_ctx, b, el);
+    grpc_metadata_batch_remove(b, el);
     add_error(error_name, &error,
               grpc_metadata_batch_add_head(
-                  exec_ctx, b, el,
+                  b, el,
                   grpc_mdelem_from_slices(
-                      exec_ctx, GRPC_MDSTR_AUTHORITY,
+                      GRPC_MDSTR_AUTHORITY,
                       grpc_slice_ref_internal(GRPC_MDVALUE(md)))));
-    GRPC_MDELEM_UNREF(exec_ctx, md);
+    GRPC_MDELEM_UNREF(md);
   }
 
   if (b->idx.named.authority == nullptr) {
@@ -263,21 +259,18 @@ static grpc_error* server_filter_incoming_metadata(grpc_exec_ctx* exec_ctx,
   return error;
 }
 
-static void hs_on_recv(grpc_exec_ctx* exec_ctx, void* user_data,
-                       grpc_error* err) {
+static void hs_on_recv(void* user_data, grpc_error* err) {
   grpc_call_element* elem = (grpc_call_element*)user_data;
   call_data* calld = (call_data*)elem->call_data;
   if (err == GRPC_ERROR_NONE) {
-    err = server_filter_incoming_metadata(exec_ctx, elem,
-                                          calld->recv_initial_metadata);
+    err = server_filter_incoming_metadata(elem, calld->recv_initial_metadata);
   } else {
     GRPC_ERROR_REF(err);
   }
-  GRPC_CLOSURE_RUN(exec_ctx, calld->on_done_recv, err);
+  GRPC_CLOSURE_RUN(calld->on_done_recv, err);
 }
 
-static void hs_on_complete(grpc_exec_ctx* exec_ctx, void* user_data,
-                           grpc_error* err) {
+static void hs_on_complete(void* user_data, grpc_error* err) {
   grpc_call_element* elem = (grpc_call_element*)user_data;
   call_data* calld = (call_data*)elem->call_data;
   /* Call recv_message_ready if we got the payload via the path field */
@@ -287,17 +280,16 @@ static void hs_on_complete(grpc_exec_ctx* exec_ctx, void* user_data,
                                   : (grpc_byte_stream*)&calld->read_stream;
     // Re-enter call combiner for recv_message_ready, since the surface
     // code will release the call combiner for each callback it receives.
-    GRPC_CALL_COMBINER_START(exec_ctx, calld->call_combiner,
-                             calld->recv_message_ready, GRPC_ERROR_REF(err),
+    GRPC_CALL_COMBINER_START(calld->call_combiner, calld->recv_message_ready,
+                             GRPC_ERROR_REF(err),
                              "resuming recv_message_ready from on_complete");
     calld->recv_message_ready = nullptr;
     calld->payload_bin_delivered = true;
   }
-  GRPC_CLOSURE_RUN(exec_ctx, calld->on_complete, GRPC_ERROR_REF(err));
+  GRPC_CLOSURE_RUN(calld->on_complete, GRPC_ERROR_REF(err));
 }
 
-static void hs_recv_message_ready(grpc_exec_ctx* exec_ctx, void* user_data,
-                                  grpc_error* err) {
+static void hs_recv_message_ready(void* user_data, grpc_error* err) {
   grpc_call_element* elem = (grpc_call_element*)user_data;
   call_data* calld = (call_data*)elem->call_data;
   if (calld->seen_path_with_query) {
@@ -305,15 +297,14 @@ static void hs_recv_message_ready(grpc_exec_ctx* exec_ctx, void* user_data,
     // returned in hs_on_complete callback.
     // Note that we release the call combiner here, so that other
     // callbacks can run.
-    GRPC_CALL_COMBINER_STOP(exec_ctx, calld->call_combiner,
+    GRPC_CALL_COMBINER_STOP(calld->call_combiner,
                             "pausing recv_message_ready until on_complete");
   } else {
-    GRPC_CLOSURE_RUN(exec_ctx, calld->recv_message_ready, GRPC_ERROR_REF(err));
+    GRPC_CLOSURE_RUN(calld->recv_message_ready, GRPC_ERROR_REF(err));
   }
 }
 
-static grpc_error* hs_mutate_op(grpc_exec_ctx* exec_ctx,
-                                grpc_call_element* elem,
+static grpc_error* hs_mutate_op(grpc_call_element* elem,
                                 grpc_transport_stream_op_batch* op) {
   /* grab pointers to our data from the call element */
   call_data* calld = (call_data*)elem->call_data;
@@ -321,21 +312,19 @@ static grpc_error* hs_mutate_op(grpc_exec_ctx* exec_ctx,
   if (op->send_initial_metadata) {
     grpc_error* error = GRPC_ERROR_NONE;
     static const char* error_name = "Failed sending initial metadata";
+    add_error(error_name, &error,
+              grpc_metadata_batch_add_head(
+                  op->payload->send_initial_metadata.send_initial_metadata,
+                  &calld->status, GRPC_MDELEM_STATUS_200));
+    add_error(error_name, &error,
+              grpc_metadata_batch_add_tail(
+                  op->payload->send_initial_metadata.send_initial_metadata,
+                  &calld->content_type,
+                  GRPC_MDELEM_CONTENT_TYPE_APPLICATION_SLASH_GRPC));
     add_error(
         error_name, &error,
-        grpc_metadata_batch_add_head(
-            exec_ctx, op->payload->send_initial_metadata.send_initial_metadata,
-            &calld->status, GRPC_MDELEM_STATUS_200));
-    add_error(
-        error_name, &error,
-        grpc_metadata_batch_add_tail(
-            exec_ctx, op->payload->send_initial_metadata.send_initial_metadata,
-            &calld->content_type,
-            GRPC_MDELEM_CONTENT_TYPE_APPLICATION_SLASH_GRPC));
-    add_error(error_name, &error,
-              server_filter_outgoing_metadata(
-                  exec_ctx, elem,
-                  op->payload->send_initial_metadata.send_initial_metadata));
+        server_filter_outgoing_metadata(
+            elem, op->payload->send_initial_metadata.send_initial_metadata));
     if (error != GRPC_ERROR_NONE) return error;
   }
 
@@ -367,8 +356,7 @@ static grpc_error* hs_mutate_op(grpc_exec_ctx* exec_ctx,
 
   if (op->send_trailing_metadata) {
     grpc_error* error = server_filter_outgoing_metadata(
-        exec_ctx, elem,
-        op->payload->send_trailing_metadata.send_trailing_metadata);
+        elem, op->payload->send_trailing_metadata.send_trailing_metadata);
     if (error != GRPC_ERROR_NONE) return error;
   }
 
@@ -376,23 +364,21 @@ static grpc_error* hs_mutate_op(grpc_exec_ctx* exec_ctx,
 }
 
 static void hs_start_transport_stream_op_batch(
-    grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
-    grpc_transport_stream_op_batch* op) {
+    grpc_call_element* elem, grpc_transport_stream_op_batch* op) {
   call_data* calld = (call_data*)elem->call_data;
   GPR_TIMER_BEGIN("hs_start_transport_stream_op_batch", 0);
-  grpc_error* error = hs_mutate_op(exec_ctx, elem, op);
+  grpc_error* error = hs_mutate_op(elem, op);
   if (error != GRPC_ERROR_NONE) {
-    grpc_transport_stream_op_batch_finish_with_failure(exec_ctx, op, error,
+    grpc_transport_stream_op_batch_finish_with_failure(op, error,
                                                        calld->call_combiner);
   } else {
-    grpc_call_next_op(exec_ctx, elem, op);
+    grpc_call_next_op(elem, op);
   }
   GPR_TIMER_END("hs_start_transport_stream_op_batch", 0);
 }
 
 /* Constructor for call_data */
-static grpc_error* init_call_elem(grpc_exec_ctx* exec_ctx,
-                                  grpc_call_element* elem,
+static grpc_error* init_call_elem(grpc_call_element* elem,
                                   const grpc_call_element_args* args) {
   /* grab pointers to our data from the call element */
   call_data* calld = (call_data*)elem->call_data;
@@ -409,24 +395,22 @@ static grpc_error* init_call_elem(grpc_exec_ctx* exec_ctx,
 }
 
 /* Destructor for call_data */
-static void destroy_call_elem(grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
+static void destroy_call_elem(grpc_call_element* elem,
                               const grpc_call_final_info* final_info,
                               grpc_closure* ignored) {
   call_data* calld = (call_data*)elem->call_data;
-  grpc_slice_buffer_destroy_internal(exec_ctx, &calld->read_slice_buffer);
+  grpc_slice_buffer_destroy_internal(&calld->read_slice_buffer);
 }
 
 /* Constructor for channel_data */
-static grpc_error* init_channel_elem(grpc_exec_ctx* exec_ctx,
-                                     grpc_channel_element* elem,
+static grpc_error* init_channel_elem(grpc_channel_element* elem,
                                      grpc_channel_element_args* args) {
   GPR_ASSERT(!args->is_last);
   return GRPC_ERROR_NONE;
 }
 
 /* Destructor for channel data */
-static void destroy_channel_elem(grpc_exec_ctx* exec_ctx,
-                                 grpc_channel_element* elem) {}
+static void destroy_channel_elem(grpc_channel_element* elem) {}
 
 const grpc_channel_filter grpc_http_server_filter = {
     hs_start_transport_stream_op_batch,

src/core/ext/filters/load_reporting/server_load_reporting_filter.cc

@@ -54,8 +54,7 @@ typedef struct channel_data {
   intptr_t id; /**< an id unique to the channel */
 } channel_data;
 
-static void on_initial_md_ready(grpc_exec_ctx* exec_ctx, void* user_data,
-                                grpc_error* err) {
+static void on_initial_md_ready(void* user_data, grpc_error* err) {
   grpc_call_element* elem = (grpc_call_element*)user_data;
   call_data* calld = (call_data*)elem->call_data;
 
@@ -73,20 +72,19 @@ static void on_initial_md_ready(grpc_exec_ctx* exec_ctx, void* user_data,
           GRPC_MDVALUE(calld->recv_initial_metadata->idx.named.lb_token->md));
       calld->have_initial_md_string = true;
       grpc_metadata_batch_remove(
-          exec_ctx, calld->recv_initial_metadata,
+          calld->recv_initial_metadata,
           calld->recv_initial_metadata->idx.named.lb_token);
     }
   } else {
     GRPC_ERROR_REF(err);
   }
   calld->ops_recv_initial_metadata_ready->cb(
-      exec_ctx, calld->ops_recv_initial_metadata_ready->cb_arg, err);
+      calld->ops_recv_initial_metadata_ready->cb_arg, err);
   GRPC_ERROR_UNREF(err);
 }
 
 /* Constructor for call_data */
-static grpc_error* init_call_elem(grpc_exec_ctx* exec_ctx,
-                                  grpc_call_element* elem,
+static grpc_error* init_call_elem(grpc_call_element* elem,
                                   const grpc_call_element_args* args) {
   call_data* calld = (call_data*)elem->call_data;
   calld->id = (intptr_t)args->call_stack;
@@ -108,7 +106,7 @@ static grpc_error* init_call_elem(grpc_exec_ctx* exec_ctx,
 }
 
 /* Destructor for call_data */
-static void destroy_call_elem(grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
+static void destroy_call_elem(grpc_call_element* elem,
                               const grpc_call_final_info* final_info,
                               grpc_closure* ignored) {
   call_data* calld = (call_data*)elem->call_data;
@@ -125,19 +123,18 @@ static void destroy_call_elem(grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
   */
 
   if (calld->have_initial_md_string) {
-    grpc_slice_unref_internal(exec_ctx, calld->initial_md_string);
+    grpc_slice_unref_internal(calld->initial_md_string);
   }
   if (calld->have_trailing_md_string) {
-    grpc_slice_unref_internal(exec_ctx, calld->trailing_md_string);
+    grpc_slice_unref_internal(calld->trailing_md_string);
   }
   if (calld->have_service_method) {
-    grpc_slice_unref_internal(exec_ctx, calld->service_method);
+    grpc_slice_unref_internal(calld->service_method);
   }
 }
 
 /* Constructor for channel_data */
-static grpc_error* init_channel_elem(grpc_exec_ctx* exec_ctx,
-                                     grpc_channel_element* elem,
+static grpc_error* init_channel_elem(grpc_channel_element* elem,
                                      grpc_channel_element_args* args) {
   GPR_ASSERT(!args->is_last);
 
@@ -158,8 +155,7 @@ static grpc_error* init_channel_elem(grpc_exec_ctx* exec_ctx,
 }
 
 /* Destructor for channel data */
-static void destroy_channel_elem(grpc_exec_ctx* exec_ctx,
-                                 grpc_channel_element* elem) {
+static void destroy_channel_elem(grpc_channel_element* elem) {
   /* TODO(dgq): do something with the data
   channel_data *chand = elem->channel_data;
   grpc_load_reporting_call_data lr_call_data = {
@@ -173,8 +169,7 @@ static void destroy_channel_elem(grpc_exec_ctx* exec_ctx,
   */
 }
 
-static grpc_filtered_mdelem lr_trailing_md_filter(grpc_exec_ctx* exec_ctx,
-                                                  void* user_data,
+static grpc_filtered_mdelem lr_trailing_md_filter(void* user_data,
                                                   grpc_mdelem md) {
   grpc_call_element* elem = (grpc_call_element*)user_data;
   call_data* calld = (call_data*)elem->call_data;
@@ -186,8 +181,7 @@ static grpc_filtered_mdelem lr_trailing_md_filter(grpc_exec_ctx* exec_ctx,
 }
 
 static void lr_start_transport_stream_op_batch(
-    grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
-    grpc_transport_stream_op_batch* op) {
+    grpc_call_element* elem, grpc_transport_stream_op_batch* op) {
   GPR_TIMER_BEGIN("lr_start_transport_stream_op_batch", 0);
   call_data* calld = (call_data*)elem->call_data;
 
@@ -203,12 +197,11 @@ static void lr_start_transport_stream_op_batch(
     GRPC_LOG_IF_ERROR(
         "grpc_metadata_batch_filter",
         grpc_metadata_batch_filter(
-            exec_ctx,
             op->payload->send_trailing_metadata.send_trailing_metadata,
             lr_trailing_md_filter, elem,
             "LR trailing metadata filtering error"));
   }
-  grpc_call_next_op(exec_ctx, elem, op);
+  grpc_call_next_op(elem, op);
 
   GPR_TIMER_END("lr_start_transport_stream_op_batch", 0);
 }

src/core/ext/filters/load_reporting/server_load_reporting_plugin.cc

@@ -38,7 +38,7 @@ static bool is_load_reporting_enabled(const grpc_channel_args* a) {
 }
 
 static bool maybe_add_server_load_reporting_filter(
-    grpc_exec_ctx* exec_ctx, grpc_channel_stack_builder* builder, void* arg) {
+    grpc_channel_stack_builder* builder, void* arg) {
   const grpc_channel_args* args =
       grpc_channel_stack_builder_get_channel_arguments(builder);
   const grpc_channel_filter* filter = (const grpc_channel_filter*)arg;

src/core/ext/filters/max_age/max_age_filter.cc

@@ -88,73 +88,69 @@ typedef struct channel_data {
 
 /* Increase the nubmer of active calls. Before the increasement, if there are no
    calls, the max_idle_timer should be cancelled. */
-static void increase_call_count(grpc_exec_ctx* exec_ctx, channel_data* chand) {
+static void increase_call_count(channel_data* chand) {
   if (gpr_atm_full_fetch_add(&chand->call_count, 1) == 0) {
-    grpc_timer_cancel(exec_ctx, &chand->max_idle_timer);
+    grpc_timer_cancel(&chand->max_idle_timer);
   }
 }
 
 /* Decrease the nubmer of active calls. After the decrement, if there are no
    calls, the max_idle_timer should be started. */
-static void decrease_call_count(grpc_exec_ctx* exec_ctx, channel_data* chand) {
+static void decrease_call_count(channel_data* chand) {
   if (gpr_atm_full_fetch_add(&chand->call_count, -1) == 1) {
     GRPC_CHANNEL_STACK_REF(chand->channel_stack, "max_age max_idle_timer");
-    grpc_timer_init(exec_ctx, &chand->max_idle_timer,
-                    grpc_exec_ctx_now(exec_ctx) + chand->max_connection_idle,
-                    &chand->close_max_idle_channel);
+    grpc_timer_init(
+        &chand->max_idle_timer,
+        grpc_core::ExecCtx::Get()->Now() + chand->max_connection_idle,
+        &chand->close_max_idle_channel);
   }
 }
 
-static void start_max_idle_timer_after_init(grpc_exec_ctx* exec_ctx, void* arg,
-                                            grpc_error* error) {
+static void start_max_idle_timer_after_init(void* arg, grpc_error* error) {
   channel_data* chand = (channel_data*)arg;
   /* Decrease call_count. If there are no active calls at this time,
      max_idle_timer will start here. If the number of active calls is not 0,
      max_idle_timer will start after all the active calls end. */
-  decrease_call_count(exec_ctx, chand);
-  GRPC_CHANNEL_STACK_UNREF(exec_ctx, chand->channel_stack,
+  decrease_call_count(chand);
+  GRPC_CHANNEL_STACK_UNREF(chand->channel_stack,
                            "max_age start_max_idle_timer_after_init");
 }
 
-static void start_max_age_timer_after_init(grpc_exec_ctx* exec_ctx, void* arg,
-                                           grpc_error* error) {
+static void start_max_age_timer_after_init(void* arg, grpc_error* error) {
   channel_data* chand = (channel_data*)arg;
   gpr_mu_lock(&chand->max_age_timer_mu);
   chand->max_age_timer_pending = true;
   GRPC_CHANNEL_STACK_REF(chand->channel_stack, "max_age max_age_timer");
-  grpc_timer_init(exec_ctx, &chand->max_age_timer,
-                  grpc_exec_ctx_now(exec_ctx) + chand->max_connection_age,
+  grpc_timer_init(&chand->max_age_timer,
+                  grpc_core::ExecCtx::Get()->Now() + chand->max_connection_age,
                   &chand->close_max_age_channel);
   gpr_mu_unlock(&chand->max_age_timer_mu);
   grpc_transport_op* op = grpc_make_transport_op(nullptr);
   op->on_connectivity_state_change = &chand->channel_connectivity_changed;
   op->connectivity_state = &chand->connectivity_state;
-  grpc_channel_next_op(exec_ctx,
-                       grpc_channel_stack_element(chand->channel_stack, 0), op);
-  GRPC_CHANNEL_STACK_UNREF(exec_ctx, chand->channel_stack,
+  grpc_channel_next_op(grpc_channel_stack_element(chand->channel_stack, 0), op);
+  GRPC_CHANNEL_STACK_UNREF(chand->channel_stack,
                            "max_age start_max_age_timer_after_init");
 }
 
-static void start_max_age_grace_timer_after_goaway_op(grpc_exec_ctx* exec_ctx,
-                                                      void* arg,
+static void start_max_age_grace_timer_after_goaway_op(void* arg,
                                                       grpc_error* error) {
   channel_data* chand = (channel_data*)arg;
   gpr_mu_lock(&chand->max_age_timer_mu);
   chand->max_age_grace_timer_pending = true;
   GRPC_CHANNEL_STACK_REF(chand->channel_stack, "max_age max_age_grace_timer");
   grpc_timer_init(
-      exec_ctx, &chand->max_age_grace_timer,
+      &chand->max_age_grace_timer,
       chand->max_connection_age_grace == GRPC_MILLIS_INF_FUTURE
           ? GRPC_MILLIS_INF_FUTURE
-          : grpc_exec_ctx_now(exec_ctx) + chand->max_connection_age_grace,
+          : grpc_core::ExecCtx::Get()->Now() + chand->max_connection_age_grace,
       &chand->force_close_max_age_channel);
   gpr_mu_unlock(&chand->max_age_timer_mu);
-  GRPC_CHANNEL_STACK_UNREF(exec_ctx, chand->channel_stack,
+  GRPC_CHANNEL_STACK_UNREF(chand->channel_stack,
                            "max_age start_max_age_grace_timer_after_goaway_op");
 }
 
-static void close_max_idle_channel(grpc_exec_ctx* exec_ctx, void* arg,
-                                   grpc_error* error) {
+static void close_max_idle_channel(void* arg, grpc_error* error) {
   channel_data* chand = (channel_data*)arg;
   if (error == GRPC_ERROR_NONE) {
     /* Prevent the max idle timer from being set again */
@@ -165,16 +161,14 @@ static void close_max_idle_channel(grpc_exec_ctx* exec_ctx, void* arg,
                            GRPC_ERROR_INT_HTTP2_ERROR, GRPC_HTTP2_NO_ERROR);
     grpc_channel_element* elem =
         grpc_channel_stack_element(chand->channel_stack, 0);
-    elem->filter->start_transport_op(exec_ctx, elem, op);
+    elem->filter->start_transport_op(elem, op);
   } else if (error != GRPC_ERROR_CANCELLED) {
     GRPC_LOG_IF_ERROR("close_max_idle_channel", error);
   }
-  GRPC_CHANNEL_STACK_UNREF(exec_ctx, chand->channel_stack,
-                           "max_age max_idle_timer");
+  GRPC_CHANNEL_STACK_UNREF(chand->channel_stack, "max_age max_idle_timer");
 }
 
-static void close_max_age_channel(grpc_exec_ctx* exec_ctx, void* arg,
-                                  grpc_error* error) {
+static void close_max_age_channel(void* arg, grpc_error* error) {
   channel_data* chand = (channel_data*)arg;
   gpr_mu_lock(&chand->max_age_timer_mu);
   chand->max_age_timer_pending = false;
@@ -189,16 +183,14 @@ static void close_max_age_channel(grpc_exec_ctx* exec_ctx, void* arg,
                            GRPC_ERROR_INT_HTTP2_ERROR, GRPC_HTTP2_NO_ERROR);
     grpc_channel_element* elem =
         grpc_channel_stack_element(chand->channel_stack, 0);
-    elem->filter->start_transport_op(exec_ctx, elem, op);
+    elem->filter->start_transport_op(elem, op);
   } else if (error != GRPC_ERROR_CANCELLED) {
     GRPC_LOG_IF_ERROR("close_max_age_channel", error);
   }
-  GRPC_CHANNEL_STACK_UNREF(exec_ctx, chand->channel_stack,
-                           "max_age max_age_timer");
+  GRPC_CHANNEL_STACK_UNREF(chand->channel_stack, "max_age max_age_timer");
 }
 
-static void force_close_max_age_channel(grpc_exec_ctx* exec_ctx, void* arg,
-                                        grpc_error* error) {
+static void force_close_max_age_channel(void* arg, grpc_error* error) {
   channel_data* chand = (channel_data*)arg;
   gpr_mu_lock(&chand->max_age_timer_mu);
   chand->max_age_grace_timer_pending = false;
@@ -209,38 +201,36 @@ static void force_close_max_age_channel(grpc_exec_ctx* exec_ctx, void* arg,
         GRPC_ERROR_CREATE_FROM_STATIC_STRING("Channel reaches max age");
     grpc_channel_element* elem =
         grpc_channel_stack_element(chand->channel_stack, 0);
-    elem->filter->start_transport_op(exec_ctx, elem, op);
+    elem->filter->start_transport_op(elem, op);
   } else if (error != GRPC_ERROR_CANCELLED) {
     GRPC_LOG_IF_ERROR("force_close_max_age_channel", error);
   }
-  GRPC_CHANNEL_STACK_UNREF(exec_ctx, chand->channel_stack,
-                           "max_age max_age_grace_timer");
+  GRPC_CHANNEL_STACK_UNREF(chand->channel_stack, "max_age max_age_grace_timer");
 }
 
-static void channel_connectivity_changed(grpc_exec_ctx* exec_ctx, void* arg,
-                                         grpc_error* error) {
+static void channel_connectivity_changed(void* arg, grpc_error* error) {
   channel_data* chand = (channel_data*)arg;
   if (chand->connectivity_state != GRPC_CHANNEL_SHUTDOWN) {
     grpc_transport_op* op = grpc_make_transport_op(nullptr);
     op->on_connectivity_state_change = &chand->channel_connectivity_changed;
     op->connectivity_state = &chand->connectivity_state;
-    grpc_channel_next_op(
-        exec_ctx, grpc_channel_stack_element(chand->channel_stack, 0), op);
+    grpc_channel_next_op(grpc_channel_stack_element(chand->channel_stack, 0),
+                         op);
   } else {
     gpr_mu_lock(&chand->max_age_timer_mu);
     if (chand->max_age_timer_pending) {
-      grpc_timer_cancel(exec_ctx, &chand->max_age_timer);
+      grpc_timer_cancel(&chand->max_age_timer);
       chand->max_age_timer_pending = false;
     }
     if (chand->max_age_grace_timer_pending) {
-      grpc_timer_cancel(exec_ctx, &chand->max_age_grace_timer);
+      grpc_timer_cancel(&chand->max_age_grace_timer);
       chand->max_age_grace_timer_pending = false;
     }
     gpr_mu_unlock(&chand->max_age_timer_mu);
     /* If there are no active calls, this increasement will cancel
        max_idle_timer, and prevent max_idle_timer from being started in the
        future. */
-    increase_call_count(exec_ctx, chand);
+    increase_call_count(chand);
   }
 }
 
@@ -263,25 +253,23 @@ add_random_max_connection_age_jitter_and_convert_to_grpc_millis(int value) {
 }
 
 /* Constructor for call_data. */
-static grpc_error* init_call_elem(grpc_exec_ctx* exec_ctx,
-                                  grpc_call_element* elem,
+static grpc_error* init_call_elem(grpc_call_element* elem,
                                   const grpc_call_element_args* args) {
   channel_data* chand = (channel_data*)elem->channel_data;
-  increase_call_count(exec_ctx, chand);
+  increase_call_count(chand);
   return GRPC_ERROR_NONE;
 }
 
 /* Destructor for call_data. */
-static void destroy_call_elem(grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
+static void destroy_call_elem(grpc_call_element* elem,
                               const grpc_call_final_info* final_info,
                               grpc_closure* ignored) {
   channel_data* chand = (channel_data*)elem->channel_data;
-  decrease_call_count(exec_ctx, chand);
+  decrease_call_count(chand);
 }
 
 /* Constructor for channel_data. */
-static grpc_error* init_channel_elem(grpc_exec_ctx* exec_ctx,
-                                     grpc_channel_element* elem,
+static grpc_error* init_channel_elem(grpc_channel_element* elem,
                                      grpc_channel_element_args* args) {
   channel_data* chand = (channel_data*)elem->channel_data;
   gpr_mu_init(&chand->max_age_timer_mu);
@@ -351,8 +339,7 @@ static grpc_error* init_channel_elem(grpc_exec_ctx* exec_ctx,
        initialization is done. */
     GRPC_CHANNEL_STACK_REF(chand->channel_stack,
                            "max_age start_max_age_timer_after_init");
-    GRPC_CLOSURE_SCHED(exec_ctx, &chand->start_max_age_timer_after_init,
-                       GRPC_ERROR_NONE);
+    GRPC_CLOSURE_SCHED(&chand->start_max_age_timer_after_init, GRPC_ERROR_NONE);
   }
 
   /* Initialize the number of calls as 1, so that the max_idle_timer will not
@@ -361,15 +348,14 @@ static grpc_error* init_channel_elem(grpc_exec_ctx* exec_ctx,
   if (chand->max_connection_idle != GRPC_MILLIS_INF_FUTURE) {
     GRPC_CHANNEL_STACK_REF(chand->channel_stack,
                            "max_age start_max_idle_timer_after_init");
-    GRPC_CLOSURE_SCHED(exec_ctx, &chand->start_max_idle_timer_after_init,
+    GRPC_CLOSURE_SCHED(&chand->start_max_idle_timer_after_init,
                        GRPC_ERROR_NONE);
   }
   return GRPC_ERROR_NONE;
 }
 
 /* Destructor for channel_data. */
-static void destroy_channel_elem(grpc_exec_ctx* exec_ctx,
-                                 grpc_channel_element* elem) {}
+static void destroy_channel_elem(grpc_channel_element* elem) {}
 
 const grpc_channel_filter grpc_max_age_filter = {
     grpc_call_next_op,
@@ -384,8 +370,7 @@ const grpc_channel_filter grpc_max_age_filter = {
     grpc_channel_next_get_info,
     "max_age"};
 
-static bool maybe_add_max_age_filter(grpc_exec_ctx* exec_ctx,
-                                     grpc_channel_stack_builder* builder,
+static bool maybe_add_max_age_filter(grpc_channel_stack_builder* builder,
                                      void* arg) {
   const grpc_channel_args* channel_args =
       grpc_channel_stack_builder_get_channel_arguments(builder);

src/core/ext/filters/message_size/message_size_filter.cc

@@ -47,8 +47,7 @@ static void* refcounted_message_size_limits_ref(void* value) {
   return value;
 }
 
-static void refcounted_message_size_limits_unref(grpc_exec_ctx* exec_ctx,
-                                                 void* value) {
+static void refcounted_message_size_limits_unref(void* value) {
   refcounted_message_size_limits* limits =
       (refcounted_message_size_limits*)value;
   if (gpr_unref(&limits->refs)) {
@@ -108,8 +107,7 @@ typedef struct channel_data {
 
 // Callback invoked when we receive a message.  Here we check the max
 // receive message size.
-static void recv_message_ready(grpc_exec_ctx* exec_ctx, void* user_data,
-                               grpc_error* error) {
+static void recv_message_ready(void* user_data, grpc_error* error) {
   grpc_call_element* elem = (grpc_call_element*)user_data;
   call_data* calld = (call_data*)elem->call_data;
   if (*calld->recv_message != nullptr && calld->limits.max_recv_size >= 0 &&
@@ -132,13 +130,12 @@ static void recv_message_ready(grpc_exec_ctx* exec_ctx, void* user_data,
     GRPC_ERROR_REF(error);
   }
   // Invoke the next callback.
-  GRPC_CLOSURE_RUN(exec_ctx, calld->next_recv_message_ready, error);
+  GRPC_CLOSURE_RUN(calld->next_recv_message_ready, error);
 }
 
 // Start transport stream op.
 static void start_transport_stream_op_batch(
-    grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
-    grpc_transport_stream_op_batch* op) {
+    grpc_call_element* elem, grpc_transport_stream_op_batch* op) {
   call_data* calld = (call_data*)elem->call_data;
   // Check max send message size.
   if (op->send_message && calld->limits.max_send_size >= 0 &&
@@ -149,7 +146,7 @@ static void start_transport_stream_op_batch(
                  op->payload->send_message.send_message->length,
                  calld->limits.max_send_size);
     grpc_transport_stream_op_batch_finish_with_failure(
-        exec_ctx, op,
+        op,
         grpc_error_set_int(GRPC_ERROR_CREATE_FROM_COPIED_STRING(message_string),
                            GRPC_ERROR_INT_GRPC_STATUS,
                            GRPC_STATUS_RESOURCE_EXHAUSTED),
@@ -165,12 +162,11 @@ static void start_transport_stream_op_batch(
     op->payload->recv_message.recv_message_ready = &calld->recv_message_ready;
   }
   // Chain to the next filter.
-  grpc_call_next_op(exec_ctx, elem, op);
+  grpc_call_next_op(elem, op);
 }
 
 // Constructor for call_data.
-static grpc_error* init_call_elem(grpc_exec_ctx* exec_ctx,
-                                  grpc_call_element* elem,
+static grpc_error* init_call_elem(grpc_call_element* elem,
                                   const grpc_call_element_args* args) {
   channel_data* chand = (channel_data*)elem->channel_data;
   call_data* calld = (call_data*)elem->call_data;
@@ -186,7 +182,7 @@ static grpc_error* init_call_elem(grpc_exec_ctx* exec_ctx,
   if (chand->method_limit_table != nullptr) {
     refcounted_message_size_limits* limits =
         (refcounted_message_size_limits*)grpc_method_config_table_get(
-            exec_ctx, chand->method_limit_table, args->path);
+            chand->method_limit_table, args->path);
     if (limits != nullptr) {
       if (limits->limits.max_send_size >= 0 &&
           (limits->limits.max_send_size < calld->limits.max_send_size ||
@@ -204,7 +200,7 @@ static grpc_error* init_call_elem(grpc_exec_ctx* exec_ctx,
 }
 
 // Destructor for call_data.
-static void destroy_call_elem(grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
+static void destroy_call_elem(grpc_call_element* elem,
                               const grpc_call_final_info* final_info,
                               grpc_closure* ignored) {}
 
@@ -241,8 +237,7 @@ message_size_limits get_message_size_limits(
 }
 
 // Constructor for channel_data.
-static grpc_error* init_channel_elem(grpc_exec_ctx* exec_ctx,
-                                     grpc_channel_element* elem,
+static grpc_error* init_channel_elem(grpc_channel_element* elem,
                                      grpc_channel_element_args* args) {
   GPR_ASSERT(!args->is_last);
   channel_data* chand = (channel_data*)elem->channel_data;
@@ -257,8 +252,7 @@ static grpc_error* init_channel_elem(grpc_exec_ctx* exec_ctx,
     if (service_config != nullptr) {
       chand->method_limit_table =
           grpc_service_config_create_method_config_table(
-              exec_ctx, service_config,
-              refcounted_message_size_limits_create_from_json,
+              service_config, refcounted_message_size_limits_create_from_json,
               refcounted_message_size_limits_ref,
               refcounted_message_size_limits_unref);
       grpc_service_config_destroy(service_config);
@@ -268,10 +262,9 @@ static grpc_error* init_channel_elem(grpc_exec_ctx* exec_ctx,
 }
 
 // Destructor for channel_data.
-static void destroy_channel_elem(grpc_exec_ctx* exec_ctx,
-                                 grpc_channel_element* elem) {
+static void destroy_channel_elem(grpc_channel_element* elem) {
   channel_data* chand = (channel_data*)elem->channel_data;
-  grpc_slice_hash_table_unref(exec_ctx, chand->method_limit_table);
+  grpc_slice_hash_table_unref(chand->method_limit_table);
 }
 
 const grpc_channel_filter grpc_message_size_filter = {
@@ -287,8 +280,7 @@ const grpc_channel_filter grpc_message_size_filter = {
     grpc_channel_next_get_info,
     "message_size"};
 
-static bool maybe_add_message_size_filter(grpc_exec_ctx* exec_ctx,
-                                          grpc_channel_stack_builder* builder,
+static bool maybe_add_message_size_filter(grpc_channel_stack_builder* builder,
                                           void* arg) {
   const grpc_channel_args* channel_args =
       grpc_channel_stack_builder_get_channel_arguments(builder);

src/core/ext/filters/workarounds/workaround_cronet_compression_filter.cc

@@ -50,8 +50,7 @@ static bool get_user_agent_mdelem(const grpc_metadata_batch* batch,
 }
 
 // Callback invoked when we receive an initial metadata.
-static void recv_initial_metadata_ready(grpc_exec_ctx* exec_ctx,
-                                        void* user_data, grpc_error* error) {
+static void recv_initial_metadata_ready(void* user_data, grpc_error* error) {
   grpc_call_element* elem = (grpc_call_element*)user_data;
   call_data* calld = (call_data*)elem->call_data;
 
@@ -67,14 +66,13 @@ static void recv_initial_metadata_ready(grpc_exec_ctx* exec_ctx,
   }
 
   // Invoke the next callback.
-  GRPC_CLOSURE_RUN(exec_ctx, calld->next_recv_initial_metadata_ready,
+  GRPC_CLOSURE_RUN(calld->next_recv_initial_metadata_ready,
                    GRPC_ERROR_REF(error));
 }
 
 // Start transport stream op.
 static void start_transport_stream_op_batch(
-    grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
-    grpc_transport_stream_op_batch* op) {
+    grpc_call_element* elem, grpc_transport_stream_op_batch* op) {
   call_data* calld = (call_data*)elem->call_data;
 
   // Inject callback for receiving initial metadata
@@ -96,12 +94,11 @@ static void start_transport_stream_op_batch(
   }
 
   // Chain to the next filter.
-  grpc_call_next_op(exec_ctx, elem, op);
+  grpc_call_next_op(elem, op);
 }
 
 // Constructor for call_data.
-static grpc_error* init_call_elem(grpc_exec_ctx* exec_ctx,
-                                  grpc_call_element* elem,
+static grpc_error* init_call_elem(grpc_call_element* elem,
                                   const grpc_call_element_args* args) {
   call_data* calld = (call_data*)elem->call_data;
   calld->next_recv_initial_metadata_ready = nullptr;
@@ -113,20 +110,18 @@ static grpc_error* init_call_elem(grpc_exec_ctx* exec_ctx,
 }
 
 // Destructor for call_data.
-static void destroy_call_elem(grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
+static void destroy_call_elem(grpc_call_element* elem,
                               const grpc_call_final_info* final_info,
                               grpc_closure* ignored) {}
 
 // Constructor for channel_data.
-static grpc_error* init_channel_elem(grpc_exec_ctx* exec_ctx,
-                                     grpc_channel_element* elem,
+static grpc_error* init_channel_elem(grpc_channel_element* elem,
                                      grpc_channel_element_args* args) {
   return GRPC_ERROR_NONE;
 }
 
 // Destructor for channel_data.
-static void destroy_channel_elem(grpc_exec_ctx* exec_ctx,
-                                 grpc_channel_element* elem) {}
+static void destroy_channel_elem(grpc_channel_element* elem) {}
 
 // Parse the user agent
 static bool parse_user_agent(grpc_mdelem md) {
@@ -181,7 +176,7 @@ const grpc_channel_filter grpc_workaround_cronet_compression_filter = {
     "workaround_cronet_compression"};
 
 static bool register_workaround_cronet_compression(
-    grpc_exec_ctx* exec_ctx, grpc_channel_stack_builder* builder, void* arg) {
+    grpc_channel_stack_builder* builder, void* arg) {
   const grpc_channel_args* channel_args =
       grpc_channel_stack_builder_get_channel_arguments(builder);
   const grpc_arg* a = grpc_channel_args_find(

src/core/ext/transport/chttp2/client/chttp2_connector.cc

@@ -61,38 +61,34 @@ static void chttp2_connector_ref(grpc_connector* con) {
   gpr_ref(&c->refs);
 }
 
-static void chttp2_connector_unref(grpc_exec_ctx* exec_ctx,
-                                   grpc_connector* con) {
+static void chttp2_connector_unref(grpc_connector* con) {
   chttp2_connector* c = (chttp2_connector*)con;
   if (gpr_unref(&c->refs)) {
     gpr_mu_destroy(&c->mu);
     // If handshaking is not yet in progress, destroy the endpoint.
     // Otherwise, the handshaker will do this for us.
-    if (c->endpoint != nullptr) grpc_endpoint_destroy(exec_ctx, c->endpoint);
+    if (c->endpoint != nullptr) grpc_endpoint_destroy(c->endpoint);
     gpr_free(c);
   }
 }
 
-static void chttp2_connector_shutdown(grpc_exec_ctx* exec_ctx,
-                                      grpc_connector* con, grpc_error* why) {
+static void chttp2_connector_shutdown(grpc_connector* con, grpc_error* why) {
   chttp2_connector* c = (chttp2_connector*)con;
   gpr_mu_lock(&c->mu);
   c->shutdown = true;
   if (c->handshake_mgr != nullptr) {
-    grpc_handshake_manager_shutdown(exec_ctx, c->handshake_mgr,
-                                    GRPC_ERROR_REF(why));
+    grpc_handshake_manager_shutdown(c->handshake_mgr, GRPC_ERROR_REF(why));
   }
   // If handshaking is not yet in progress, shutdown the endpoint.
   // Otherwise, the handshaker will do this for us.
   if (!c->connecting && c->endpoint != nullptr) {
-    grpc_endpoint_shutdown(exec_ctx, c->endpoint, GRPC_ERROR_REF(why));
+    grpc_endpoint_shutdown(c->endpoint, GRPC_ERROR_REF(why));
   }
   gpr_mu_unlock(&c->mu);
   GRPC_ERROR_UNREF(why);
 }
 
-static void on_handshake_done(grpc_exec_ctx* exec_ctx, void* arg,
-                              grpc_error* error) {
+static void on_handshake_done(void* arg, grpc_error* error) {
   grpc_handshaker_args* args = (grpc_handshaker_args*)arg;
   chttp2_connector* c = (chttp2_connector*)args->user_data;
   gpr_mu_lock(&c->mu);
@@ -105,20 +101,20 @@ static void on_handshake_done(grpc_exec_ctx* exec_ctx, void* arg,
       // before destroying them, even if we know that there are no
       // pending read/write callbacks.  This should be fixed, at which
       // point this can be removed.
-      grpc_endpoint_shutdown(exec_ctx, args->endpoint, GRPC_ERROR_REF(error));
-      grpc_endpoint_destroy(exec_ctx, args->endpoint);
-      grpc_channel_args_destroy(exec_ctx, args->args);
-      grpc_slice_buffer_destroy_internal(exec_ctx, args->read_buffer);
+      grpc_endpoint_shutdown(args->endpoint, GRPC_ERROR_REF(error));
+      grpc_endpoint_destroy(args->endpoint);
+      grpc_channel_args_destroy(args->args);
+      grpc_slice_buffer_destroy_internal(args->read_buffer);
       gpr_free(args->read_buffer);
     } else {
       error = GRPC_ERROR_REF(error);
     }
     memset(c->result, 0, sizeof(*c->result));
   } else {
-    grpc_endpoint_delete_from_pollset_set(exec_ctx, args->endpoint,
+    grpc_endpoint_delete_from_pollset_set(args->endpoint,
                                           c->args.interested_parties);
-    c->result->transport = grpc_create_chttp2_transport(exec_ctx, args->args,
-                                                        args->endpoint, true);
+    c->result->transport =
+        grpc_create_chttp2_transport(args->args, args->endpoint, true);
     GPR_ASSERT(c->result->transport);
     // TODO(roth): We ideally want to wait until we receive HTTP/2
     // settings from the server before we consider the connection
@@ -144,34 +140,32 @@ static void on_handshake_done(grpc_exec_ctx* exec_ctx, void* arg,
     // so until after transparent retries is implemented.  Otherwise, any
     // RPC that we attempt to send on the connection before the timeout
     // would fail instead of being retried on a subsequent attempt.
-    grpc_chttp2_transport_start_reading(exec_ctx, c->result->transport,
-                                        args->read_buffer, nullptr);
+    grpc_chttp2_transport_start_reading(c->result->transport, args->read_buffer,
+                                        nullptr);
     c->result->channel_args = args->args;
   }
   grpc_closure* notify = c->notify;
   c->notify = nullptr;
-  GRPC_CLOSURE_SCHED(exec_ctx, notify, error);
-  grpc_handshake_manager_destroy(exec_ctx, c->handshake_mgr);
+  GRPC_CLOSURE_SCHED(notify, error);
+  grpc_handshake_manager_destroy(c->handshake_mgr);
   c->handshake_mgr = nullptr;
   gpr_mu_unlock(&c->mu);
-  chttp2_connector_unref(exec_ctx, (grpc_connector*)c);
+  chttp2_connector_unref((grpc_connector*)c);
 }
 
-static void start_handshake_locked(grpc_exec_ctx* exec_ctx,
-                                   chttp2_connector* c) {
+static void start_handshake_locked(chttp2_connector* c) {
   c->handshake_mgr = grpc_handshake_manager_create();
-  grpc_handshakers_add(exec_ctx, HANDSHAKER_CLIENT, c->args.channel_args,
+  grpc_handshakers_add(HANDSHAKER_CLIENT, c->args.channel_args,
                        c->handshake_mgr);
-  grpc_endpoint_add_to_pollset_set(exec_ctx, c->endpoint,
-                                   c->args.interested_parties);
+  grpc_endpoint_add_to_pollset_set(c->endpoint, c->args.interested_parties);
   grpc_handshake_manager_do_handshake(
-      exec_ctx, c->handshake_mgr, c->args.interested_parties, c->endpoint,
+      c->handshake_mgr, c->args.interested_parties, c->endpoint,
       c->args.channel_args, c->args.deadline, nullptr /* acceptor */,
       on_handshake_done, c);
   c->endpoint = nullptr;  // Endpoint handed off to handshake manager.
 }
 
-static void connected(grpc_exec_ctx* exec_ctx, void* arg, grpc_error* error) {
+static void connected(void* arg, grpc_error* error) {
   chttp2_connector* c = (chttp2_connector*)arg;
   gpr_mu_lock(&c->mu);
   GPR_ASSERT(c->connecting);
@@ -185,27 +179,26 @@ static void connected(grpc_exec_ctx* exec_ctx, void* arg, grpc_error* error) {
     memset(c->result, 0, sizeof(*c->result));
     grpc_closure* notify = c->notify;
     c->notify = nullptr;
-    GRPC_CLOSURE_SCHED(exec_ctx, notify, error);
+    GRPC_CLOSURE_SCHED(notify, error);
     if (c->endpoint != nullptr) {
-      grpc_endpoint_shutdown(exec_ctx, c->endpoint, GRPC_ERROR_REF(error));
+      grpc_endpoint_shutdown(c->endpoint, GRPC_ERROR_REF(error));
     }
     gpr_mu_unlock(&c->mu);
-    chttp2_connector_unref(exec_ctx, (grpc_connector*)arg);
+    chttp2_connector_unref((grpc_connector*)arg);
   } else {
     GPR_ASSERT(c->endpoint != nullptr);
-    start_handshake_locked(exec_ctx, c);
+    start_handshake_locked(c);
     gpr_mu_unlock(&c->mu);
   }
 }
 
-static void chttp2_connector_connect(grpc_exec_ctx* exec_ctx,
-                                     grpc_connector* con,
+static void chttp2_connector_connect(grpc_connector* con,
                                      const grpc_connect_in_args* args,
                                      grpc_connect_out_args* result,
                                      grpc_closure* notify) {
   chttp2_connector* c = (chttp2_connector*)con;
   grpc_resolved_address addr;
-  grpc_get_subchannel_address_arg(exec_ctx, args->channel_args, &addr);
+  grpc_get_subchannel_address_arg(args->channel_args, &addr);
   gpr_mu_lock(&c->mu);
   GPR_ASSERT(c->notify == nullptr);
   c->notify = notify;
@@ -216,9 +209,8 @@ static void chttp2_connector_connect(grpc_exec_ctx* exec_ctx,
   GRPC_CLOSURE_INIT(&c->connected, connected, c, grpc_schedule_on_exec_ctx);
   GPR_ASSERT(!c->connecting);
   c->connecting = true;
-  grpc_tcp_client_connect(exec_ctx, &c->connected, &c->endpoint,
-                          args->interested_parties, args->channel_args, &addr,
-                          args->deadline);
+  grpc_tcp_client_connect(&c->connected, &c->endpoint, args->interested_parties,
+                          args->channel_args, &addr, args->deadline);
   gpr_mu_unlock(&c->mu);
 }
 

src/core/ext/transport/chttp2/client/insecure/channel_create.cc

@@ -34,21 +34,19 @@ static void client_channel_factory_ref(
     grpc_client_channel_factory* cc_factory) {}
 
 static void client_channel_factory_unref(
-    grpc_exec_ctx* exec_ctx, grpc_client_channel_factory* cc_factory) {}
+    grpc_client_channel_factory* cc_factory) {}
 
 static grpc_subchannel* client_channel_factory_create_subchannel(
-    grpc_exec_ctx* exec_ctx, grpc_client_channel_factory* cc_factory,
-    const grpc_subchannel_args* args) {
+    grpc_client_channel_factory* cc_factory, const grpc_subchannel_args* args) {
   grpc_connector* connector = grpc_chttp2_connector_create();
-  grpc_subchannel* s = grpc_subchannel_create(exec_ctx, connector, args);
-  grpc_connector_unref(exec_ctx, connector);
+  grpc_subchannel* s = grpc_subchannel_create(connector, args);
+  grpc_connector_unref(connector);
   return s;
 }
 
 static grpc_channel* client_channel_factory_create_channel(
-    grpc_exec_ctx* exec_ctx, grpc_client_channel_factory* cc_factory,
-    const char* target, grpc_client_channel_type type,
-    const grpc_channel_args* args) {
+    grpc_client_channel_factory* cc_factory, const char* target,
+    grpc_client_channel_type type, const grpc_channel_args* args) {
   if (target == nullptr) {
     gpr_log(GPR_ERROR, "cannot create channel with NULL target name");
     return nullptr;
@@ -56,14 +54,14 @@ static grpc_channel* client_channel_factory_create_channel(
   // Add channel arg containing the server URI.
   grpc_arg arg = grpc_channel_arg_string_create(
       (char*)GRPC_ARG_SERVER_URI,
-      grpc_resolver_factory_add_default_prefix_if_needed(exec_ctx, target));
+      grpc_resolver_factory_add_default_prefix_if_needed(target));
   const char* to_remove[] = {GRPC_ARG_SERVER_URI};
   grpc_channel_args* new_args =
       grpc_channel_args_copy_and_add_and_remove(args, to_remove, 1, &arg, 1);
   gpr_free(arg.value.string);
-  grpc_channel* channel = grpc_channel_create(exec_ctx, target, new_args,
-                                              GRPC_CLIENT_CHANNEL, nullptr);
-  grpc_channel_args_destroy(exec_ctx, new_args);
+  grpc_channel* channel =
+      grpc_channel_create(target, new_args, GRPC_CLIENT_CHANNEL, nullptr);
+  grpc_channel_args_destroy(new_args);
   return channel;
 }
 
@@ -82,7 +80,7 @@ static grpc_client_channel_factory client_channel_factory = {
 grpc_channel* grpc_insecure_channel_create(const char* target,
                                            const grpc_channel_args* args,
                                            void* reserved) {
-  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+  grpc_core::ExecCtx exec_ctx;
   GRPC_API_TRACE(
       "grpc_insecure_channel_create(target=%s, args=%p, reserved=%p)", 3,
       (target, args, reserved));
@@ -93,11 +91,11 @@ grpc_channel* grpc_insecure_channel_create(const char* target,
   grpc_channel_args* new_args = grpc_channel_args_copy_and_add(args, &arg, 1);
   // Create channel.
   grpc_channel* channel = client_channel_factory_create_channel(
-      &exec_ctx, &client_channel_factory, target,
-      GRPC_CLIENT_CHANNEL_TYPE_REGULAR, new_args);
+      &client_channel_factory, target, GRPC_CLIENT_CHANNEL_TYPE_REGULAR,
+      new_args);
   // Clean up.
-  grpc_channel_args_destroy(&exec_ctx, new_args);
-  grpc_exec_ctx_finish(&exec_ctx);
+  grpc_channel_args_destroy(new_args);
+
   return channel != nullptr ? channel
                             : grpc_lame_client_channel_create(
                                   target, GRPC_STATUS_INTERNAL,

src/core/ext/transport/chttp2/client/insecure/channel_create_posix.cc

@@ -37,7 +37,7 @@
 
 grpc_channel* grpc_insecure_channel_create_from_fd(
     const char* target, int fd, const grpc_channel_args* args) {
-  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+  grpc_core::ExecCtx exec_ctx;
   GRPC_API_TRACE("grpc_insecure_channel_create(target=%p, fd=%d, args=%p)", 3,
                  (target, fd, args));
 
@@ -50,17 +50,17 @@ grpc_channel* grpc_insecure_channel_create_from_fd(
   GPR_ASSERT(fcntl(fd, F_SETFL, flags | O_NONBLOCK) == 0);
 
   grpc_endpoint* client = grpc_tcp_client_create_from_fd(
-      &exec_ctx, grpc_fd_create(fd, "client"), args, "fd-client");
+      grpc_fd_create(fd, "client"), args, "fd-client");
 
   grpc_transport* transport =
-      grpc_create_chttp2_transport(&exec_ctx, final_args, client, true);
+      grpc_create_chttp2_transport(final_args, client, true);
   GPR_ASSERT(transport);
   grpc_channel* channel = grpc_channel_create(
-      &exec_ctx, target, final_args, GRPC_CLIENT_DIRECT_CHANNEL, transport);
-  grpc_channel_args_destroy(&exec_ctx, final_args);
-  grpc_chttp2_transport_start_reading(&exec_ctx, transport, nullptr, nullptr);
+      target, final_args, GRPC_CLIENT_DIRECT_CHANNEL, transport);
+  grpc_channel_args_destroy(final_args);
+  grpc_chttp2_transport_start_reading(transport, nullptr, nullptr);
 
-  grpc_exec_ctx_finish(&exec_ctx);
+  grpc_core::ExecCtx::Get()->Flush();
 
   return channel != nullptr ? channel
                             : grpc_lame_client_channel_create(
@@ -73,7 +73,7 @@ grpc_channel* grpc_insecure_channel_create_from_fd(
 grpc_channel* grpc_insecure_channel_create_from_fd(
     const char* target, int fd, const grpc_channel_args* args) {
   GPR_ASSERT(0);
-  return NULL;
+  return nullptr;
 }
 
 #endif  // GPR_SUPPORT_CHANNELS_FROM_FD

src/core/ext/transport/chttp2/client/secure/secure_channel_create.cc

@@ -41,10 +41,10 @@ static void client_channel_factory_ref(
     grpc_client_channel_factory* cc_factory) {}
 
 static void client_channel_factory_unref(
-    grpc_exec_ctx* exec_ctx, grpc_client_channel_factory* cc_factory) {}
+    grpc_client_channel_factory* cc_factory) {}
 
 static grpc_subchannel_args* get_secure_naming_subchannel_args(
-    grpc_exec_ctx* exec_ctx, const grpc_subchannel_args* args) {
+    const grpc_subchannel_args* args) {
   grpc_channel_credentials* channel_credentials =
       grpc_channel_credentials_find_in_args(args->args);
   if (channel_credentials == nullptr) {
@@ -68,7 +68,7 @@ static grpc_subchannel_args* get_secure_naming_subchannel_args(
   const char* server_uri_str = server_uri_arg->value.string;
   GPR_ASSERT(server_uri_str != nullptr);
   grpc_uri* server_uri =
-      grpc_uri_parse(exec_ctx, server_uri_str, true /* supress errors */);
+      grpc_uri_parse(server_uri_str, true /* supress errors */);
   GPR_ASSERT(server_uri != nullptr);
   const char* server_uri_path;
   server_uri_path =
@@ -81,7 +81,7 @@ static grpc_subchannel_args* get_secure_naming_subchannel_args(
     const char* target_uri_str =
         grpc_get_subchannel_address_uri_arg(args->args);
     grpc_uri* target_uri =
-        grpc_uri_parse(exec_ctx, target_uri_str, false /* suppress errors */);
+        grpc_uri_parse(target_uri_str, false /* suppress errors */);
     GPR_ASSERT(target_uri != nullptr);
     if (target_uri->path[0] != '\0') {  // "path" may be empty
       const grpc_slice key = grpc_slice_from_static_string(
@@ -89,7 +89,7 @@ static grpc_subchannel_args* get_secure_naming_subchannel_args(
       const char* value =
           (const char*)grpc_slice_hash_table_get(targets_info, key);
       if (value != nullptr) target_name_to_check = gpr_strdup(value);
-      grpc_slice_unref_internal(exec_ctx, key);
+      grpc_slice_unref_internal(key);
     }
     if (target_name_to_check == nullptr) {
       // If the target name to check hasn't already been set, fall back to using
@@ -107,7 +107,7 @@ static grpc_subchannel_args* get_secure_naming_subchannel_args(
   grpc_channel_args* new_args_from_connector = nullptr;
   const grpc_security_status security_status =
       grpc_channel_credentials_create_security_connector(
-          exec_ctx, channel_credentials, target_name_to_check, args->args,
+          channel_credentials, target_name_to_check, args->args,
           &subchannel_security_connector, &new_args_from_connector);
   if (security_status != GRPC_SECURITY_OK) {
     gpr_log(GPR_ERROR,
@@ -123,10 +123,10 @@ static grpc_subchannel_args* get_secure_naming_subchannel_args(
   grpc_channel_args* new_args = grpc_channel_args_copy_and_add(
       new_args_from_connector != nullptr ? new_args_from_connector : args->args,
       &new_security_connector_arg, 1);
-  GRPC_SECURITY_CONNECTOR_UNREF(exec_ctx, &subchannel_security_connector->base,
+  GRPC_SECURITY_CONNECTOR_UNREF(&subchannel_security_connector->base,
                                 "lb_channel_create");
   if (new_args_from_connector != nullptr) {
-    grpc_channel_args_destroy(exec_ctx, new_args_from_connector);
+    grpc_channel_args_destroy(new_args_from_connector);
   }
   grpc_subchannel_args* final_sc_args =
       (grpc_subchannel_args*)gpr_malloc(sizeof(*final_sc_args));
@@ -136,10 +136,9 @@ static grpc_subchannel_args* get_secure_naming_subchannel_args(
 }
 
 static grpc_subchannel* client_channel_factory_create_subchannel(
-    grpc_exec_ctx* exec_ctx, grpc_client_channel_factory* cc_factory,
-    const grpc_subchannel_args* args) {
+    grpc_client_channel_factory* cc_factory, const grpc_subchannel_args* args) {
   grpc_subchannel_args* subchannel_args =
-      get_secure_naming_subchannel_args(exec_ctx, args);
+      get_secure_naming_subchannel_args(args);
   if (subchannel_args == nullptr) {
     gpr_log(
         GPR_ERROR,
@@ -147,19 +146,16 @@ static grpc_subchannel* client_channel_factory_create_subchannel(
     return nullptr;
   }
   grpc_connector* connector = grpc_chttp2_connector_create();
-  grpc_subchannel* s =
-      grpc_subchannel_create(exec_ctx, connector, subchannel_args);
-  grpc_connector_unref(exec_ctx, connector);
-  grpc_channel_args_destroy(exec_ctx,
-                            (grpc_channel_args*)subchannel_args->args);
+  grpc_subchannel* s = grpc_subchannel_create(connector, subchannel_args);
+  grpc_connector_unref(connector);
+  grpc_channel_args_destroy((grpc_channel_args*)subchannel_args->args);
   gpr_free(subchannel_args);
   return s;
 }
 
 static grpc_channel* client_channel_factory_create_channel(
-    grpc_exec_ctx* exec_ctx, grpc_client_channel_factory* cc_factory,
-    const char* target, grpc_client_channel_type type,
-    const grpc_channel_args* args) {
+    grpc_client_channel_factory* cc_factory, const char* target,
+    grpc_client_channel_type type, const grpc_channel_args* args) {
   if (target == nullptr) {
     gpr_log(GPR_ERROR, "cannot create channel with NULL target name");
     return nullptr;
@@ -167,14 +163,14 @@ static grpc_channel* client_channel_factory_create_channel(
   // Add channel arg containing the server URI.
   grpc_arg arg = grpc_channel_arg_string_create(
       (char*)GRPC_ARG_SERVER_URI,
-      grpc_resolver_factory_add_default_prefix_if_needed(exec_ctx, target));
+      grpc_resolver_factory_add_default_prefix_if_needed(target));
   const char* to_remove[] = {GRPC_ARG_SERVER_URI};
   grpc_channel_args* new_args =
       grpc_channel_args_copy_and_add_and_remove(args, to_remove, 1, &arg, 1);
   gpr_free(arg.value.string);
-  grpc_channel* channel = grpc_channel_create(exec_ctx, target, new_args,
-                                              GRPC_CLIENT_CHANNEL, nullptr);
-  grpc_channel_args_destroy(exec_ctx, new_args);
+  grpc_channel* channel =
+      grpc_channel_create(target, new_args, GRPC_CLIENT_CHANNEL, nullptr);
+  grpc_channel_args_destroy(new_args);
   return channel;
 }
 
@@ -194,7 +190,7 @@ grpc_channel* grpc_secure_channel_create(grpc_channel_credentials* creds,
                                          const char* target,
                                          const grpc_channel_args* args,
                                          void* reserved) {
-  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+  grpc_core::ExecCtx exec_ctx;
   GRPC_API_TRACE(
       "grpc_secure_channel_create(creds=%p, target=%s, args=%p, "
       "reserved=%p)",
@@ -211,11 +207,10 @@ grpc_channel* grpc_secure_channel_create(grpc_channel_credentials* creds,
         args, args_to_add, GPR_ARRAY_SIZE(args_to_add));
     // Create channel.
     channel = client_channel_factory_create_channel(
-        &exec_ctx, &client_channel_factory, target,
-        GRPC_CLIENT_CHANNEL_TYPE_REGULAR, new_args);
+        &client_channel_factory, target, GRPC_CLIENT_CHANNEL_TYPE_REGULAR,
+        new_args);
     // Clean up.
-    grpc_channel_args_destroy(&exec_ctx, new_args);
-    grpc_exec_ctx_finish(&exec_ctx);
+    grpc_channel_args_destroy(new_args);
   }
   return channel != nullptr ? channel
                             : grpc_lame_client_channel_create(

src/core/ext/transport/chttp2/server/chttp2_server.cc

@@ -69,17 +69,17 @@ typedef struct {
 } server_connection_state;
 
 static void server_connection_state_unref(
-    grpc_exec_ctx* exec_ctx, server_connection_state* connection_state) {
+    server_connection_state* connection_state) {
   if (gpr_unref(&connection_state->refs)) {
     if (connection_state->transport != nullptr) {
-      GRPC_CHTTP2_UNREF_TRANSPORT(exec_ctx, connection_state->transport,
+      GRPC_CHTTP2_UNREF_TRANSPORT(connection_state->transport,
                                   "receive settings timeout");
     }
     gpr_free(connection_state);
   }
 }
 
-static void on_timeout(grpc_exec_ctx* exec_ctx, void* arg, grpc_error* error) {
+static void on_timeout(void* arg, grpc_error* error) {
   server_connection_state* connection_state = (server_connection_state*)arg;
   // Note that we may be called with GRPC_ERROR_NONE when the timer fires
   // or with an error indicating that the timer system is being shut down.
@@ -87,22 +87,20 @@ static void on_timeout(grpc_exec_ctx* exec_ctx, void* arg, grpc_error* error) {
     grpc_transport_op* op = grpc_make_transport_op(nullptr);
     op->disconnect_with_error = GRPC_ERROR_CREATE_FROM_STATIC_STRING(
         "Did not receive HTTP/2 settings before handshake timeout");
-    grpc_transport_perform_op(exec_ctx, &connection_state->transport->base, op);
+    grpc_transport_perform_op(&connection_state->transport->base, op);
   }
-  server_connection_state_unref(exec_ctx, connection_state);
+  server_connection_state_unref(connection_state);
 }
 
-static void on_receive_settings(grpc_exec_ctx* exec_ctx, void* arg,
-                                grpc_error* error) {
+static void on_receive_settings(void* arg, grpc_error* error) {
   server_connection_state* connection_state = (server_connection_state*)arg;
   if (error == GRPC_ERROR_NONE) {
-    grpc_timer_cancel(exec_ctx, &connection_state->timer);
+    grpc_timer_cancel(&connection_state->timer);
   }
-  server_connection_state_unref(exec_ctx, connection_state);
+  server_connection_state_unref(connection_state);
 }
 
-static void on_handshake_done(grpc_exec_ctx* exec_ctx, void* arg,
-                              grpc_error* error) {
+static void on_handshake_done(void* arg, grpc_error* error) {
   grpc_handshaker_args* args = (grpc_handshaker_args*)arg;
   server_connection_state* connection_state =
       (server_connection_state*)args->user_data;
@@ -117,10 +115,10 @@ static void on_handshake_done(grpc_exec_ctx* exec_ctx, void* arg,
       // before destroying them, even if we know that there are no
       // pending read/write callbacks.  This should be fixed, at which
       // point this can be removed.
-      grpc_endpoint_shutdown(exec_ctx, args->endpoint, GRPC_ERROR_NONE);
-      grpc_endpoint_destroy(exec_ctx, args->endpoint);
-      grpc_channel_args_destroy(exec_ctx, args->args);
-      grpc_slice_buffer_destroy_internal(exec_ctx, args->read_buffer);
+      grpc_endpoint_shutdown(args->endpoint, GRPC_ERROR_NONE);
+      grpc_endpoint_destroy(args->endpoint);
+      grpc_channel_args_destroy(args->args);
+      grpc_slice_buffer_destroy_internal(args->read_buffer);
       gpr_free(args->read_buffer);
     }
   } else {
@@ -128,10 +126,10 @@ static void on_handshake_done(grpc_exec_ctx* exec_ctx, void* arg,
     // handshaker may have handed off the connection to some external
     // code, so we can just clean up here without creating a transport.
     if (args->endpoint != nullptr) {
-      grpc_transport* transport = grpc_create_chttp2_transport(
-          exec_ctx, args->args, args->endpoint, false);
+      grpc_transport* transport =
+          grpc_create_chttp2_transport(args->args, args->endpoint, false);
       grpc_server_setup_transport(
-          exec_ctx, connection_state->svr_state->server, transport,
+          connection_state->svr_state->server, transport,
           connection_state->accepting_pollset, args->args);
       // Use notify_on_receive_settings callback to enforce the
       // handshake deadline.
@@ -141,16 +139,14 @@ static void on_handshake_done(grpc_exec_ctx* exec_ctx, void* arg,
                         on_receive_settings, connection_state,
                         grpc_schedule_on_exec_ctx);
       grpc_chttp2_transport_start_reading(
-          exec_ctx, transport, args->read_buffer,
-          &connection_state->on_receive_settings);
-      grpc_channel_args_destroy(exec_ctx, args->args);
+          transport, args->read_buffer, &connection_state->on_receive_settings);
+      grpc_channel_args_destroy(args->args);
       gpr_ref(&connection_state->refs);
       GRPC_CHTTP2_REF_TRANSPORT((grpc_chttp2_transport*)transport,
                                 "receive settings timeout");
       GRPC_CLOSURE_INIT(&connection_state->on_timeout, on_timeout,
                         connection_state, grpc_schedule_on_exec_ctx);
-      grpc_timer_init(exec_ctx, &connection_state->timer,
-                      connection_state->deadline,
+      grpc_timer_init(&connection_state->timer, connection_state->deadline,
                       &connection_state->on_timeout);
     }
   }
@@ -158,21 +154,21 @@ static void on_handshake_done(grpc_exec_ctx* exec_ctx, void* arg,
       &connection_state->svr_state->pending_handshake_mgrs,
       connection_state->handshake_mgr);
   gpr_mu_unlock(&connection_state->svr_state->mu);
-  grpc_handshake_manager_destroy(exec_ctx, connection_state->handshake_mgr);
+  grpc_handshake_manager_destroy(connection_state->handshake_mgr);
   gpr_free(connection_state->acceptor);
-  grpc_tcp_server_unref(exec_ctx, connection_state->svr_state->tcp_server);
-  server_connection_state_unref(exec_ctx, connection_state);
+  grpc_tcp_server_unref(connection_state->svr_state->tcp_server);
+  server_connection_state_unref(connection_state);
 }
 
-static void on_accept(grpc_exec_ctx* exec_ctx, void* arg, grpc_endpoint* tcp,
+static void on_accept(void* arg, grpc_endpoint* tcp,
                       grpc_pollset* accepting_pollset,
                       grpc_tcp_server_acceptor* acceptor) {
   server_state* state = (server_state*)arg;
   gpr_mu_lock(&state->mu);
   if (state->shutdown) {
     gpr_mu_unlock(&state->mu);
-    grpc_endpoint_shutdown(exec_ctx, tcp, GRPC_ERROR_NONE);
-    grpc_endpoint_destroy(exec_ctx, tcp);
+    grpc_endpoint_shutdown(tcp, GRPC_ERROR_NONE);
+    grpc_endpoint_destroy(tcp);
     gpr_free(acceptor);
     return;
   }
@@ -188,59 +184,56 @@ static void on_accept(grpc_exec_ctx* exec_ctx, void* arg, grpc_endpoint* tcp,
   connection_state->accepting_pollset = accepting_pollset;
   connection_state->acceptor = acceptor;
   connection_state->handshake_mgr = handshake_mgr;
-  grpc_handshakers_add(exec_ctx, HANDSHAKER_SERVER, state->args,
+  grpc_handshakers_add(HANDSHAKER_SERVER, state->args,
                        connection_state->handshake_mgr);
   const grpc_arg* timeout_arg =
       grpc_channel_args_find(state->args, GRPC_ARG_SERVER_HANDSHAKE_TIMEOUT_MS);
   connection_state->deadline =
-      grpc_exec_ctx_now(exec_ctx) +
+      grpc_core::ExecCtx::Get()->Now() +
       grpc_channel_arg_get_integer(timeout_arg,
                                    {120 * GPR_MS_PER_SEC, 1, INT_MAX});
-  grpc_handshake_manager_do_handshake(exec_ctx, connection_state->handshake_mgr,
-                                      nullptr /* interested_parties */, tcp,
-                                      state->args, connection_state->deadline,
-                                      acceptor, on_handshake_done,
-                                      connection_state);
+  grpc_handshake_manager_do_handshake(
+      connection_state->handshake_mgr, nullptr /* interested_parties */, tcp,
+      state->args, connection_state->deadline, acceptor, on_handshake_done,
+      connection_state);
 }
 
 /* Server callback: start listening on our ports */
-static void server_start_listener(grpc_exec_ctx* exec_ctx, grpc_server* server,
-                                  void* arg, grpc_pollset** pollsets,
+static void server_start_listener(grpc_server* server, void* arg,
+                                  grpc_pollset** pollsets,
                                   size_t pollset_count) {
   server_state* state = (server_state*)arg;
   gpr_mu_lock(&state->mu);
   state->shutdown = false;
   gpr_mu_unlock(&state->mu);
-  grpc_tcp_server_start(exec_ctx, state->tcp_server, pollsets, pollset_count,
-                        on_accept, state);
+  grpc_tcp_server_start(state->tcp_server, pollsets, pollset_count, on_accept,
+                        state);
 }
 
-static void tcp_server_shutdown_complete(grpc_exec_ctx* exec_ctx, void* arg,
-                                         grpc_error* error) {
+static void tcp_server_shutdown_complete(void* arg, grpc_error* error) {
   server_state* state = (server_state*)arg;
   /* ensure all threads have unlocked */
   gpr_mu_lock(&state->mu);
   grpc_closure* destroy_done = state->server_destroy_listener_done;
   GPR_ASSERT(state->shutdown);
   grpc_handshake_manager_pending_list_shutdown_all(
-      exec_ctx, state->pending_handshake_mgrs, GRPC_ERROR_REF(error));
+      state->pending_handshake_mgrs, GRPC_ERROR_REF(error));
   gpr_mu_unlock(&state->mu);
   // Flush queued work before destroying handshaker factory, since that
   // may do a synchronous unref.
-  grpc_exec_ctx_flush(exec_ctx);
+  grpc_core::ExecCtx::Get()->Flush();
   if (destroy_done != nullptr) {
-    destroy_done->cb(exec_ctx, destroy_done->cb_arg, GRPC_ERROR_REF(error));
-    grpc_exec_ctx_flush(exec_ctx);
+    destroy_done->cb(destroy_done->cb_arg, GRPC_ERROR_REF(error));
+    grpc_core::ExecCtx::Get()->Flush();
   }
-  grpc_channel_args_destroy(exec_ctx, state->args);
+  grpc_channel_args_destroy(state->args);
   gpr_mu_destroy(&state->mu);
   gpr_free(state);
 }
 
 /* Server callback: destroy the tcp listener (so we don't generate further
    callbacks) */
-static void server_destroy_listener(grpc_exec_ctx* exec_ctx,
-                                    grpc_server* server, void* arg,
+static void server_destroy_listener(grpc_server* server, void* arg,
                                     grpc_closure* destroy_done) {
   server_state* state = (server_state*)arg;
   gpr_mu_lock(&state->mu);
@@ -248,12 +241,11 @@ static void server_destroy_listener(grpc_exec_ctx* exec_ctx,
   state->server_destroy_listener_done = destroy_done;
   grpc_tcp_server* tcp_server = state->tcp_server;
   gpr_mu_unlock(&state->mu);
-  grpc_tcp_server_shutdown_listeners(exec_ctx, tcp_server);
-  grpc_tcp_server_unref(exec_ctx, tcp_server);
+  grpc_tcp_server_shutdown_listeners(tcp_server);
+  grpc_tcp_server_unref(tcp_server);
 }
 
-grpc_error* grpc_chttp2_server_add_port(grpc_exec_ctx* exec_ctx,
-                                        grpc_server* server, const char* addr,
+grpc_error* grpc_chttp2_server_add_port(grpc_server* server, const char* addr,
                                         grpc_channel_args* args,
                                         int* port_num) {
   grpc_resolved_addresses* resolved = nullptr;
@@ -277,8 +269,8 @@ grpc_error* grpc_chttp2_server_add_port(grpc_exec_ctx* exec_ctx,
   GRPC_CLOSURE_INIT(&state->tcp_server_shutdown_complete,
                     tcp_server_shutdown_complete, state,
                     grpc_schedule_on_exec_ctx);
-  err = grpc_tcp_server_create(exec_ctx, &state->tcp_server_shutdown_complete,
-                               args, &tcp_server);
+  err = grpc_tcp_server_create(&state->tcp_server_shutdown_complete, args,
+                               &tcp_server);
   if (err != GRPC_ERROR_NONE) {
     goto error;
   }
@@ -327,7 +319,7 @@ grpc_error* grpc_chttp2_server_add_port(grpc_exec_ctx* exec_ctx,
   grpc_resolved_addresses_destroy(resolved);
 
   /* Register with the server only upon success */
-  grpc_server_add_listener(exec_ctx, server, state, server_start_listener,
+  grpc_server_add_listener(server, state, server_start_listener,
                            server_destroy_listener);
   goto done;
 
@@ -338,9 +330,9 @@ error:
     grpc_resolved_addresses_destroy(resolved);
   }
   if (tcp_server) {
-    grpc_tcp_server_unref(exec_ctx, tcp_server);
+    grpc_tcp_server_unref(tcp_server);
   } else {
-    grpc_channel_args_destroy(exec_ctx, args);
+    grpc_channel_args_destroy(args);
     gpr_free(state);
   }
   *port_num = 0;

src/core/ext/transport/chttp2/server/chttp2_server.h

@@ -25,8 +25,7 @@
 
 /// Adds a port to \a server.  Sets \a port_num to the port number.
 /// Takes ownership of \a args.
-grpc_error* grpc_chttp2_server_add_port(grpc_exec_ctx* exec_ctx,
-                                        grpc_server* server, const char* addr,
+grpc_error* grpc_chttp2_server_add_port(grpc_server* server, const char* addr,
                                         grpc_channel_args* args, int* port_num);
 
 #endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_SERVER_CHTTP2_SERVER_H */

src/core/ext/transport/chttp2/server/insecure/server_chttp2.cc

@@ -26,12 +26,12 @@
 #include "src/core/lib/surface/server.h"
 
 int grpc_server_add_insecure_http2_port(grpc_server* server, const char* addr) {
-  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+  grpc_core::ExecCtx exec_ctx;
   int port_num = 0;
   GRPC_API_TRACE("grpc_server_add_insecure_http2_port(server=%p, addr=%s)", 2,
                  (server, addr));
   grpc_error* err = grpc_chttp2_server_add_port(
-      &exec_ctx, server, addr,
+      server, addr,
       grpc_channel_args_copy(grpc_server_get_channel_args(server)), &port_num);
   if (err != GRPC_ERROR_NONE) {
     const char* msg = grpc_error_string(err);
@@ -39,6 +39,6 @@ int grpc_server_add_insecure_http2_port(grpc_server* server, const char* addr) {
 
     GRPC_ERROR_UNREF(err);
   }
-  grpc_exec_ctx_finish(&exec_ctx);
+
   return port_num;
 }

src/core/ext/transport/chttp2/server/insecure/server_chttp2_posix.cc

@@ -38,32 +38,29 @@ void grpc_server_add_insecure_channel_from_fd(grpc_server* server,
                                               void* reserved, int fd) {
   GPR_ASSERT(reserved == nullptr);
 
-  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+  grpc_core::ExecCtx exec_ctx;
   char* name;
   gpr_asprintf(&name, "fd:%d", fd);
 
-  grpc_endpoint* server_endpoint =
-      grpc_tcp_create(&exec_ctx, grpc_fd_create(fd, name),
-                      grpc_server_get_channel_args(server), name);
+  grpc_endpoint* server_endpoint = grpc_tcp_create(
+      grpc_fd_create(fd, name), grpc_server_get_channel_args(server), name);
 
   gpr_free(name);
 
   const grpc_channel_args* server_args = grpc_server_get_channel_args(server);
   grpc_transport* transport = grpc_create_chttp2_transport(
-      &exec_ctx, server_args, server_endpoint, false /* is_client */);
+      server_args, server_endpoint, false /* is_client */);
 
   grpc_pollset** pollsets;
   size_t num_pollsets = 0;
   grpc_server_get_pollsets(server, &pollsets, &num_pollsets);
 
   for (size_t i = 0; i < num_pollsets; i++) {
-    grpc_endpoint_add_to_pollset(&exec_ctx, server_endpoint, pollsets[i]);
+    grpc_endpoint_add_to_pollset(server_endpoint, pollsets[i]);
   }
 
-  grpc_server_setup_transport(&exec_ctx, server, transport, nullptr,
-                              server_args);
-  grpc_chttp2_transport_start_reading(&exec_ctx, transport, nullptr, nullptr);
-  grpc_exec_ctx_finish(&exec_ctx);
+  grpc_server_setup_transport(server, transport, nullptr, server_args);
+  grpc_chttp2_transport_start_reading(transport, nullptr, nullptr);
 }
 
 #else  // !GPR_SUPPORT_CHANNELS_FROM_FD

src/core/ext/transport/chttp2/server/secure/server_secure_chttp2.cc

@@ -36,7 +36,7 @@
 
 int grpc_server_add_secure_http2_port(grpc_server* server, const char* addr,
                                       grpc_server_credentials* creds) {
-  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+  grpc_core::ExecCtx exec_ctx;
   grpc_error* err = GRPC_ERROR_NONE;
   grpc_server_security_connector* sc = nullptr;
   int port_num = 0;
@@ -52,8 +52,7 @@ int grpc_server_add_secure_http2_port(grpc_server* server, const char* addr,
         "No credentials specified for secure server port (creds==NULL)");
     goto done;
   }
-  status =
-      grpc_server_credentials_create_security_connector(&exec_ctx, creds, &sc);
+  status = grpc_server_credentials_create_security_connector(creds, &sc);
   if (status != GRPC_SECURITY_OK) {
     char* msg;
     gpr_asprintf(&msg,
@@ -72,12 +71,12 @@ int grpc_server_add_secure_http2_port(grpc_server* server, const char* addr,
       grpc_channel_args_copy_and_add(grpc_server_get_channel_args(server),
                                      args_to_add, GPR_ARRAY_SIZE(args_to_add));
   // Add server port.
-  err = grpc_chttp2_server_add_port(&exec_ctx, server, addr, args, &port_num);
+  err = grpc_chttp2_server_add_port(server, addr, args, &port_num);
 done:
   if (sc != nullptr) {
-    GRPC_SECURITY_CONNECTOR_UNREF(&exec_ctx, &sc->base, "server");
+    GRPC_SECURITY_CONNECTOR_UNREF(&sc->base, "server");
   }
-  grpc_exec_ctx_finish(&exec_ctx);
+
   if (err != GRPC_ERROR_NONE) {
     const char* msg = grpc_error_string(err);
     gpr_log(GPR_ERROR, "%s", msg);

src/core/ext/transport/chttp2/transport/bin_decoder.cc

@@ -130,8 +130,7 @@ bool grpc_base64_decode_partial(struct grpc_base64_decode_context* ctx) {
   return true;
 }
 
-grpc_slice grpc_chttp2_base64_decode(grpc_exec_ctx* exec_ctx,
-                                     grpc_slice input) {
+grpc_slice grpc_chttp2_base64_decode(grpc_slice input) {
   size_t input_length = GRPC_SLICE_LENGTH(input);
   size_t output_length = input_length / 4 * 3;
   struct grpc_base64_decode_context ctx;
@@ -167,7 +166,7 @@ grpc_slice grpc_chttp2_base64_decode(grpc_exec_ctx* exec_ctx,
     char* s = grpc_slice_to_c_string(input);
     gpr_log(GPR_ERROR, "Base64 decoding failed, input string:\n%s\n", s);
     gpr_free(s);
-    grpc_slice_unref_internal(exec_ctx, output);
+    grpc_slice_unref_internal(output);
     return grpc_empty_slice();
   }
   GPR_ASSERT(ctx.output_cur == GRPC_SLICE_END_PTR(output));
@@ -175,8 +174,7 @@ grpc_slice grpc_chttp2_base64_decode(grpc_exec_ctx* exec_ctx,
   return output;
 }
 
-grpc_slice grpc_chttp2_base64_decode_with_length(grpc_exec_ctx* exec_ctx,
-                                                 grpc_slice input,
+grpc_slice grpc_chttp2_base64_decode_with_length(grpc_slice input,
                                                  size_t output_length) {
   size_t input_length = GRPC_SLICE_LENGTH(input);
   grpc_slice output = GRPC_SLICE_MALLOC(output_length);
@@ -189,7 +187,7 @@ grpc_slice grpc_chttp2_base64_decode_with_length(grpc_exec_ctx* exec_ctx,
             "grpc_chttp2_base64_decode_with_length has a length of %d, which "
             "has a tail of 1 byte.\n",
             (int)input_length);
-    grpc_slice_unref_internal(exec_ctx, output);
+    grpc_slice_unref_internal(output);
     return grpc_empty_slice();
   }
 
@@ -199,7 +197,7 @@ grpc_slice grpc_chttp2_base64_decode_with_length(grpc_exec_ctx* exec_ctx,
             "than the max possible output length %d.\n",
             (int)output_length,
             (int)(input_length / 4 * 3 + tail_xtra[input_length % 4]));
-    grpc_slice_unref_internal(exec_ctx, output);
+    grpc_slice_unref_internal(output);
     return grpc_empty_slice();
   }
 
@@ -213,7 +211,7 @@ grpc_slice grpc_chttp2_base64_decode_with_length(grpc_exec_ctx* exec_ctx,
     char* s = grpc_slice_to_c_string(input);
     gpr_log(GPR_ERROR, "Base64 decoding failed, input string:\n%s\n", s);
     gpr_free(s);
-    grpc_slice_unref_internal(exec_ctx, output);
+    grpc_slice_unref_internal(output);
     return grpc_empty_slice();
   }
   GPR_ASSERT(ctx.output_cur == GRPC_SLICE_END_PTR(output));

src/core/ext/transport/chttp2/transport/bin_decoder.h

@@ -40,13 +40,12 @@ bool grpc_base64_decode_partial(struct grpc_base64_decode_context* ctx);
 
 /* base64 decode a slice with pad chars. Returns a new slice, does not take
    ownership of the input. Returns an empty slice if decoding is failed. */
-grpc_slice grpc_chttp2_base64_decode(grpc_exec_ctx* exec_ctx, grpc_slice input);
+grpc_slice grpc_chttp2_base64_decode(grpc_slice input);
 
 /* base64 decode a slice without pad chars, data length is needed. Returns a new
    slice, does not take ownership of the input. Returns an empty slice if
    decoding is failed. */
-grpc_slice grpc_chttp2_base64_decode_with_length(grpc_exec_ctx* exec_ctx,
-                                                 grpc_slice input,
+grpc_slice grpc_chttp2_base64_decode_with_length(grpc_slice input,
                                                  size_t output_length);
 
 #endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_BIN_DECODER_H */

src/core/ext/transport/chttp2/transport/bin_encoder.h

@@ -32,7 +32,7 @@ grpc_slice grpc_chttp2_huffman_compress(grpc_slice input);
 /* equivalent to:
    grpc_slice x = grpc_chttp2_base64_encode(input);
    grpc_slice y = grpc_chttp2_huffman_compress(x);
-   grpc_slice_unref_internal(exec_ctx, x);
+   grpc_slice_unref_internal( x);
    return y; */
 grpc_slice grpc_chttp2_base64_encode_and_huffman_compress(grpc_slice input);
 

src/core/ext/transport/chttp2/transport/chttp2_transport.h

@@ -28,15 +28,14 @@ extern grpc_core::TraceFlag grpc_trace_http2_stream_state;
 extern grpc_core::DebugOnlyTraceFlag grpc_trace_chttp2_refcount;
 
 grpc_transport* grpc_create_chttp2_transport(
-    grpc_exec_ctx* exec_ctx, const grpc_channel_args* channel_args,
-    grpc_endpoint* ep, bool is_client);
+    const grpc_channel_args* channel_args, grpc_endpoint* ep, bool is_client);
 
 /// Takes ownership of \a read_buffer, which (if non-NULL) contains
 /// leftover bytes previously read from the endpoint (e.g., by handshakers).
 /// If non-null, \a notify_on_receive_settings will be scheduled when
 /// HTTP/2 settings are received from the peer.
 void grpc_chttp2_transport_start_reading(
-    grpc_exec_ctx* exec_ctx, grpc_transport* transport,
-    grpc_slice_buffer* read_buffer, grpc_closure* notify_on_receive_settings);
+    grpc_transport* transport, grpc_slice_buffer* read_buffer,
+    grpc_closure* notify_on_receive_settings);
 
 #endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_CHTTP2_TRANSPORT_H */

src/core/ext/transport/chttp2/transport/flow_control.cc

@@ -149,8 +149,7 @@ void FlowControlAction::Trace(grpc_chttp2_transport* t) const {
   gpr_free(mf_str);
 }
 
-TransportFlowControl::TransportFlowControl(grpc_exec_ctx* exec_ctx,
-                                           const grpc_chttp2_transport* t,
+TransportFlowControl::TransportFlowControl(const grpc_chttp2_transport* t,
                                            bool enable_bdp_probe)
     : t_(t),
       enable_bdp_probe_(enable_bdp_probe),
@@ -163,7 +162,7 @@ TransportFlowControl::TransportFlowControl(grpc_exec_ctx* exec_ctx,
                           .set_min_control_value(-1)
                           .set_max_control_value(25)
                           .set_integral_range(10)),
-      last_pid_update_(grpc_exec_ctx_now(exec_ctx)) {}
+      last_pid_update_(grpc_core::ExecCtx::Get()->Now()) {}
 
 uint32_t TransportFlowControl::MaybeSendUpdate(bool writing_anyway) {
   FlowControlTrace trace("t updt sent", this, nullptr);
@@ -308,9 +307,8 @@ double TransportFlowControl::TargetLogBdp() {
       1 + log2(bdp_estimator_.EstimateBdp()));
 }
 
-double TransportFlowControl::SmoothLogBdp(grpc_exec_ctx* exec_ctx,
-                                          double value) {
-  grpc_millis now = grpc_exec_ctx_now(exec_ctx);
+double TransportFlowControl::SmoothLogBdp(double value) {
+  grpc_millis now = grpc_core::ExecCtx::Get()->Now();
   double bdp_error = value - pid_controller_.last_control_value();
   const double dt = (double)(now - last_pid_update_) * 1e-3;
   last_pid_update_ = now;
@@ -331,15 +329,14 @@ FlowControlAction::Urgency TransportFlowControl::DeltaUrgency(
   }
 }
 
-FlowControlAction TransportFlowControl::PeriodicUpdate(
-    grpc_exec_ctx* exec_ctx) {
+FlowControlAction TransportFlowControl::PeriodicUpdate() {
   FlowControlAction action;
   if (enable_bdp_probe_) {
     // get bdp estimate and update initial_window accordingly.
     // target might change based on how much memory pressure we are under
     // TODO(ncteisen): experiment with setting target to be huge under low
     // memory pressure.
-    const double target = pow(2, SmoothLogBdp(exec_ctx, TargetLogBdp()));
+    const double target = pow(2, SmoothLogBdp(TargetLogBdp()));
 
     // Though initial window 'could' drop to 0, we keep the floor at 128
     target_initial_window_size_ = (int32_t)GPR_CLAMP(target, 128, INT32_MAX);

src/core/ext/transport/chttp2/transport/flow_control.h

@@ -134,8 +134,7 @@ class FlowControlTrace {
 
 class TransportFlowControl {
  public:
-  TransportFlowControl(grpc_exec_ctx* exec_ctx, const grpc_chttp2_transport* t,
-                       bool enable_bdp_probe);
+  TransportFlowControl(const grpc_chttp2_transport* t, bool enable_bdp_probe);
   ~TransportFlowControl() {}
 
   bool bdp_probe() const { return enable_bdp_probe_; }
@@ -153,7 +152,7 @@ class TransportFlowControl {
   // Call periodically (at a low-ish rate, 100ms - 10s makes sense)
   // to perform more complex flow control calculations and return an action
   // to let chttp2 change its parameters
-  FlowControlAction PeriodicUpdate(grpc_exec_ctx* exec_ctx);
+  FlowControlAction PeriodicUpdate();
 
   void StreamSentData(int64_t size) { remote_window_ -= size; }
 
@@ -212,7 +211,7 @@ class TransportFlowControl {
  private:
   friend class ::grpc::testing::TrickledCHTTP2;
   double TargetLogBdp();
-  double SmoothLogBdp(grpc_exec_ctx* exec_ctx, double value);
+  double SmoothLogBdp(double value);
   FlowControlAction::Urgency DeltaUrgency(int32_t value,
                                           grpc_chttp2_setting_id setting_id);
 

src/core/ext/transport/chttp2/transport/frame_data.cc

@@ -36,11 +36,10 @@ grpc_error* grpc_chttp2_data_parser_init(grpc_chttp2_data_parser* parser) {
   return GRPC_ERROR_NONE;
 }
 
-void grpc_chttp2_data_parser_destroy(grpc_exec_ctx* exec_ctx,
-                                     grpc_chttp2_data_parser* parser) {
+void grpc_chttp2_data_parser_destroy(grpc_chttp2_data_parser* parser) {
   if (parser->parsing_frame != nullptr) {
     GRPC_ERROR_UNREF(grpc_chttp2_incoming_byte_stream_finished(
-        exec_ctx, parser->parsing_frame,
+        parser->parsing_frame,
         GRPC_ERROR_CREATE_FROM_STATIC_STRING("Parser destroyed"), false));
   }
   GRPC_ERROR_UNREF(parser->error);
@@ -98,7 +97,7 @@ void grpc_chttp2_encode_data(uint32_t id, grpc_slice_buffer* inbuf,
 }
 
 grpc_error* grpc_deframe_unprocessed_incoming_frames(
-    grpc_exec_ctx* exec_ctx, grpc_chttp2_data_parser* p, grpc_chttp2_stream* s,
+    grpc_chttp2_data_parser* p, grpc_chttp2_stream* s,
     grpc_slice_buffer* slices, grpc_slice* slice_out,
     grpc_byte_stream** stream_out) {
   grpc_error* error = GRPC_ERROR_NONE;
@@ -118,14 +117,14 @@ grpc_error* grpc_deframe_unprocessed_incoming_frames(
     char* msg;
 
     if (cur == end) {
-      grpc_slice_unref_internal(exec_ctx, slice);
+      grpc_slice_unref_internal(slice);
       continue;
     }
 
     switch (p->state) {
       case GRPC_CHTTP2_DATA_ERROR:
         p->state = GRPC_CHTTP2_DATA_ERROR;
-        grpc_slice_unref_internal(exec_ctx, slice);
+        grpc_slice_unref_internal(slice);
         return GRPC_ERROR_REF(p->error);
       case GRPC_CHTTP2_DATA_FH_0:
         s->stats.incoming.framing_bytes++;
@@ -150,12 +149,12 @@ grpc_error* grpc_deframe_unprocessed_incoming_frames(
             p->error =
                 grpc_error_set_int(p->error, GRPC_ERROR_INT_OFFSET, cur - beg);
             p->state = GRPC_CHTTP2_DATA_ERROR;
-            grpc_slice_unref_internal(exec_ctx, slice);
+            grpc_slice_unref_internal(slice);
             return GRPC_ERROR_REF(p->error);
         }
         if (++cur == end) {
           p->state = GRPC_CHTTP2_DATA_FH_1;
-          grpc_slice_unref_internal(exec_ctx, slice);
+          grpc_slice_unref_internal(slice);
           continue;
         }
       /* fallthrough */
@@ -164,7 +163,7 @@ grpc_error* grpc_deframe_unprocessed_incoming_frames(
         p->frame_size = ((uint32_t)*cur) << 24;
         if (++cur == end) {
           p->state = GRPC_CHTTP2_DATA_FH_2;
-          grpc_slice_unref_internal(exec_ctx, slice);
+          grpc_slice_unref_internal(slice);
           continue;
         }
       /* fallthrough */
@@ -173,7 +172,7 @@ grpc_error* grpc_deframe_unprocessed_incoming_frames(
         p->frame_size |= ((uint32_t)*cur) << 16;
         if (++cur == end) {
           p->state = GRPC_CHTTP2_DATA_FH_3;
-          grpc_slice_unref_internal(exec_ctx, slice);
+          grpc_slice_unref_internal(slice);
           continue;
         }
       /* fallthrough */
@@ -182,7 +181,7 @@ grpc_error* grpc_deframe_unprocessed_incoming_frames(
         p->frame_size |= ((uint32_t)*cur) << 8;
         if (++cur == end) {
           p->state = GRPC_CHTTP2_DATA_FH_4;
-          grpc_slice_unref_internal(exec_ctx, slice);
+          grpc_slice_unref_internal(slice);
           continue;
         }
       /* fallthrough */
@@ -198,11 +197,11 @@ grpc_error* grpc_deframe_unprocessed_incoming_frames(
           message_flags |= GRPC_WRITE_INTERNAL_COMPRESS;
         }
         p->parsing_frame = grpc_chttp2_incoming_byte_stream_create(
-            exec_ctx, t, s, p->frame_size, message_flags);
+            t, s, p->frame_size, message_flags);
         *stream_out = &p->parsing_frame->base;
         if (p->parsing_frame->remaining_bytes == 0) {
           GRPC_ERROR_UNREF(grpc_chttp2_incoming_byte_stream_finished(
-              exec_ctx, p->parsing_frame, GRPC_ERROR_NONE, true));
+              p->parsing_frame, GRPC_ERROR_NONE, true));
           p->parsing_frame = nullptr;
           p->state = GRPC_CHTTP2_DATA_FH_0;
         }
@@ -213,64 +212,64 @@ grpc_error* grpc_deframe_unprocessed_incoming_frames(
               slices,
               grpc_slice_sub(slice, (size_t)(cur - beg), (size_t)(end - beg)));
         }
-        grpc_slice_unref_internal(exec_ctx, slice);
+        grpc_slice_unref_internal(slice);
         return GRPC_ERROR_NONE;
       case GRPC_CHTTP2_DATA_FRAME: {
         GPR_ASSERT(p->parsing_frame != nullptr);
         GPR_ASSERT(slice_out != nullptr);
         if (cur == end) {
-          grpc_slice_unref_internal(exec_ctx, slice);
+          grpc_slice_unref_internal(slice);
           continue;
         }
         uint32_t remaining = (uint32_t)(end - cur);
         if (remaining == p->frame_size) {
           s->stats.incoming.data_bytes += remaining;
           if (GRPC_ERROR_NONE != (error = grpc_chttp2_incoming_byte_stream_push(
-                                      exec_ctx, p->parsing_frame,
+                                      p->parsing_frame,
                                       grpc_slice_sub(slice, (size_t)(cur - beg),
                                                      (size_t)(end - beg)),
                                       slice_out))) {
-            grpc_slice_unref_internal(exec_ctx, slice);
+            grpc_slice_unref_internal(slice);
             return error;
           }
           if (GRPC_ERROR_NONE !=
               (error = grpc_chttp2_incoming_byte_stream_finished(
-                   exec_ctx, p->parsing_frame, GRPC_ERROR_NONE, true))) {
-            grpc_slice_unref_internal(exec_ctx, slice);
+                   p->parsing_frame, GRPC_ERROR_NONE, true))) {
+            grpc_slice_unref_internal(slice);
             return error;
           }
           p->parsing_frame = nullptr;
           p->state = GRPC_CHTTP2_DATA_FH_0;
-          grpc_slice_unref_internal(exec_ctx, slice);
+          grpc_slice_unref_internal(slice);
           return GRPC_ERROR_NONE;
         } else if (remaining < p->frame_size) {
           s->stats.incoming.data_bytes += remaining;
           if (GRPC_ERROR_NONE != (error = grpc_chttp2_incoming_byte_stream_push(
-                                      exec_ctx, p->parsing_frame,
+                                      p->parsing_frame,
                                       grpc_slice_sub(slice, (size_t)(cur - beg),
                                                      (size_t)(end - beg)),
                                       slice_out))) {
             return error;
           }
           p->frame_size -= remaining;
-          grpc_slice_unref_internal(exec_ctx, slice);
+          grpc_slice_unref_internal(slice);
           return GRPC_ERROR_NONE;
         } else {
           GPR_ASSERT(remaining > p->frame_size);
           s->stats.incoming.data_bytes += p->frame_size;
           if (GRPC_ERROR_NONE !=
               (grpc_chttp2_incoming_byte_stream_push(
-                  exec_ctx, p->parsing_frame,
+                  p->parsing_frame,
                   grpc_slice_sub(slice, (size_t)(cur - beg),
                                  (size_t)(cur + p->frame_size - beg)),
                   slice_out))) {
-            grpc_slice_unref_internal(exec_ctx, slice);
+            grpc_slice_unref_internal(slice);
             return error;
           }
           if (GRPC_ERROR_NONE !=
               (error = grpc_chttp2_incoming_byte_stream_finished(
-                   exec_ctx, p->parsing_frame, GRPC_ERROR_NONE, true))) {
-            grpc_slice_unref_internal(exec_ctx, slice);
+                   p->parsing_frame, GRPC_ERROR_NONE, true))) {
+            grpc_slice_unref_internal(slice);
             return error;
           }
           p->parsing_frame = nullptr;
@@ -279,7 +278,7 @@ grpc_error* grpc_deframe_unprocessed_incoming_frames(
           grpc_slice_buffer_undo_take_first(
               slices,
               grpc_slice_sub(slice, (size_t)(cur - beg), (size_t)(end - beg)));
-          grpc_slice_unref_internal(exec_ctx, slice);
+          grpc_slice_unref_internal(slice);
           return GRPC_ERROR_NONE;
         }
       }
@@ -289,19 +288,19 @@ grpc_error* grpc_deframe_unprocessed_incoming_frames(
   return GRPC_ERROR_NONE;
 }
 
-grpc_error* grpc_chttp2_data_parser_parse(grpc_exec_ctx* exec_ctx, void* parser,
+grpc_error* grpc_chttp2_data_parser_parse(void* parser,
                                           grpc_chttp2_transport* t,
                                           grpc_chttp2_stream* s,
                                           grpc_slice slice, int is_last) {
   if (!s->pending_byte_stream) {
     grpc_slice_ref_internal(slice);
     grpc_slice_buffer_add(&s->frame_storage, slice);
-    grpc_chttp2_maybe_complete_recv_message(exec_ctx, t, s);
+    grpc_chttp2_maybe_complete_recv_message(t, s);
   } else if (s->on_next) {
     GPR_ASSERT(s->frame_storage.length == 0);
     grpc_slice_ref_internal(slice);
     grpc_slice_buffer_add(&s->unprocessed_incoming_frames_buffer, slice);
-    GRPC_CLOSURE_SCHED(exec_ctx, s->on_next, GRPC_ERROR_NONE);
+    GRPC_CLOSURE_SCHED(s->on_next, GRPC_ERROR_NONE);
     s->on_next = nullptr;
     s->unprocessed_incoming_frames_decompressed = false;
   } else {
@@ -310,8 +309,7 @@ grpc_error* grpc_chttp2_data_parser_parse(grpc_exec_ctx* exec_ctx, void* parser,
   }
 
   if (is_last && s->received_last_frame) {
-    grpc_chttp2_mark_stream_closed(exec_ctx, t, s, true, false,
-                                   GRPC_ERROR_NONE);
+    grpc_chttp2_mark_stream_closed(t, s, true, false, GRPC_ERROR_NONE);
   }
 
   return GRPC_ERROR_NONE;

src/core/ext/transport/chttp2/transport/frame_data.h

@@ -54,8 +54,7 @@ typedef struct {
 /* initialize per-stream state for data frame parsing */
 grpc_error* grpc_chttp2_data_parser_init(grpc_chttp2_data_parser* parser);
 
-void grpc_chttp2_data_parser_destroy(grpc_exec_ctx* exec_ctx,
-                                     grpc_chttp2_data_parser* parser);
+void grpc_chttp2_data_parser_destroy(grpc_chttp2_data_parser* parser);
 
 /* start processing a new data frame */
 grpc_error* grpc_chttp2_data_parser_begin_frame(grpc_chttp2_data_parser* parser,
@@ -65,7 +64,7 @@ grpc_error* grpc_chttp2_data_parser_begin_frame(grpc_chttp2_data_parser* parser,
 
 /* handle a slice of a data frame - is_last indicates the last slice of a
    frame */
-grpc_error* grpc_chttp2_data_parser_parse(grpc_exec_ctx* exec_ctx, void* parser,
+grpc_error* grpc_chttp2_data_parser_parse(void* parser,
                                           grpc_chttp2_transport* t,
                                           grpc_chttp2_stream* s,
                                           grpc_slice slice, int is_last);
@@ -76,7 +75,7 @@ void grpc_chttp2_encode_data(uint32_t id, grpc_slice_buffer* inbuf,
                              grpc_slice_buffer* outbuf);
 
 grpc_error* grpc_deframe_unprocessed_incoming_frames(
-    grpc_exec_ctx* exec_ctx, grpc_chttp2_data_parser* p, grpc_chttp2_stream* s,
+    grpc_chttp2_data_parser* p, grpc_chttp2_stream* s,
     grpc_slice_buffer* slices, grpc_slice* slice_out,
     grpc_byte_stream** stream_out);
 

src/core/ext/transport/chttp2/transport/frame_goaway.cc

@@ -52,8 +52,7 @@ grpc_error* grpc_chttp2_goaway_parser_begin_frame(grpc_chttp2_goaway_parser* p,
   return GRPC_ERROR_NONE;
 }
 
-grpc_error* grpc_chttp2_goaway_parser_parse(grpc_exec_ctx* exec_ctx,
-                                            void* parser,
+grpc_error* grpc_chttp2_goaway_parser_parse(void* parser,
                                             grpc_chttp2_transport* t,
                                             grpc_chttp2_stream* s,
                                             grpc_slice slice, int is_last) {
@@ -135,7 +134,7 @@ grpc_error* grpc_chttp2_goaway_parser_parse(grpc_exec_ctx* exec_ctx,
       p->state = GRPC_CHTTP2_GOAWAY_DEBUG;
       if (is_last) {
         grpc_chttp2_add_incoming_goaway(
-            exec_ctx, t, (uint32_t)p->error_code,
+            t, (uint32_t)p->error_code,
             grpc_slice_new(p->debug_data, p->debug_length, gpr_free));
         p->debug_data = nullptr;
       }

src/core/ext/transport/chttp2/transport/frame_goaway.h

@@ -50,8 +50,7 @@ void grpc_chttp2_goaway_parser_init(grpc_chttp2_goaway_parser* p);
 void grpc_chttp2_goaway_parser_destroy(grpc_chttp2_goaway_parser* p);
 grpc_error* grpc_chttp2_goaway_parser_begin_frame(
     grpc_chttp2_goaway_parser* parser, uint32_t length, uint8_t flags);
-grpc_error* grpc_chttp2_goaway_parser_parse(grpc_exec_ctx* exec_ctx,
-                                            void* parser,
+grpc_error* grpc_chttp2_goaway_parser_parse(void* parser,
                                             grpc_chttp2_transport* t,
                                             grpc_chttp2_stream* s,
                                             grpc_slice slice, int is_last);

src/core/ext/transport/chttp2/transport/frame_ping.cc

@@ -68,7 +68,7 @@ grpc_error* grpc_chttp2_ping_parser_begin_frame(grpc_chttp2_ping_parser* parser,
   return GRPC_ERROR_NONE;
 }
 
-grpc_error* grpc_chttp2_ping_parser_parse(grpc_exec_ctx* exec_ctx, void* parser,
+grpc_error* grpc_chttp2_ping_parser_parse(void* parser,
                                           grpc_chttp2_transport* t,
                                           grpc_chttp2_stream* s,
                                           grpc_slice slice, int is_last) {
@@ -86,10 +86,10 @@ grpc_error* grpc_chttp2_ping_parser_parse(grpc_exec_ctx* exec_ctx, void* parser,
   if (p->byte == 8) {
     GPR_ASSERT(is_last);
     if (p->is_ack) {
-      grpc_chttp2_ack_ping(exec_ctx, t, p->opaque_8bytes);
+      grpc_chttp2_ack_ping(t, p->opaque_8bytes);
     } else {
       if (!t->is_client) {
-        grpc_millis now = grpc_exec_ctx_now(exec_ctx);
+        grpc_millis now = grpc_core::ExecCtx::Get()->Now();
         grpc_millis next_allowed_ping =
             t->ping_recv_state.last_ping_recv_time +
             t->ping_policy.min_recv_ping_interval_without_data;
@@ -104,7 +104,7 @@ grpc_error* grpc_chttp2_ping_parser_parse(grpc_exec_ctx* exec_ctx, void* parser,
         }
 
         if (next_allowed_ping > now) {
-          grpc_chttp2_add_ping_strike(exec_ctx, t);
+          grpc_chttp2_add_ping_strike(t);
         }
 
         t->ping_recv_state.last_ping_recv_time = now;
@@ -116,8 +116,7 @@ grpc_error* grpc_chttp2_ping_parser_parse(grpc_exec_ctx* exec_ctx, void* parser,
               t->ping_acks, t->ping_ack_capacity * sizeof(*t->ping_acks));
         }
         t->ping_acks[t->ping_ack_count++] = p->opaque_8bytes;
-        grpc_chttp2_initiate_write(exec_ctx, t,
-                                   GRPC_CHTTP2_INITIATE_WRITE_PING_RESPONSE);
+        grpc_chttp2_initiate_write(t, GRPC_CHTTP2_INITIATE_WRITE_PING_RESPONSE);
       }
     }
   }

src/core/ext/transport/chttp2/transport/frame_ping.h

@@ -33,7 +33,7 @@ grpc_slice grpc_chttp2_ping_create(uint8_t ack, uint64_t opaque_8bytes);
 
 grpc_error* grpc_chttp2_ping_parser_begin_frame(grpc_chttp2_ping_parser* parser,
                                                 uint32_t length, uint8_t flags);
-grpc_error* grpc_chttp2_ping_parser_parse(grpc_exec_ctx* exec_ctx, void* parser,
+grpc_error* grpc_chttp2_ping_parser_parse(void* parser,
                                           grpc_chttp2_transport* t,
                                           grpc_chttp2_stream* s,
                                           grpc_slice slice, int is_last);

src/core/ext/transport/chttp2/transport/frame_rst_stream.cc

@@ -69,8 +69,7 @@ grpc_error* grpc_chttp2_rst_stream_parser_begin_frame(
   return GRPC_ERROR_NONE;
 }
 
-grpc_error* grpc_chttp2_rst_stream_parser_parse(grpc_exec_ctx* exec_ctx,
-                                                void* parser,
+grpc_error* grpc_chttp2_rst_stream_parser_parse(void* parser,
                                                 grpc_chttp2_transport* t,
                                                 grpc_chttp2_stream* s,
                                                 grpc_slice slice, int is_last) {
@@ -103,7 +102,7 @@ grpc_error* grpc_chttp2_rst_stream_parser_parse(grpc_exec_ctx* exec_ctx,
           GRPC_ERROR_INT_HTTP2_ERROR, (intptr_t)reason);
       gpr_free(message);
     }
-    grpc_chttp2_mark_stream_closed(exec_ctx, t, s, true, true, error);
+    grpc_chttp2_mark_stream_closed(t, s, true, true, error);
   }
 
   return GRPC_ERROR_NONE;

src/core/ext/transport/chttp2/transport/frame_rst_stream.h

@@ -34,8 +34,7 @@ grpc_slice grpc_chttp2_rst_stream_create(uint32_t stream_id, uint32_t code,
 
 grpc_error* grpc_chttp2_rst_stream_parser_begin_frame(
     grpc_chttp2_rst_stream_parser* parser, uint32_t length, uint8_t flags);
-grpc_error* grpc_chttp2_rst_stream_parser_parse(grpc_exec_ctx* exec_ctx,
-                                                void* parser,
+grpc_error* grpc_chttp2_rst_stream_parser_parse(void* parser,
                                                 grpc_chttp2_transport* t,
                                                 grpc_chttp2_stream* s,
                                                 grpc_slice slice, int is_last);

src/core/ext/transport/chttp2/transport/frame_settings.cc

@@ -108,8 +108,7 @@ grpc_error* grpc_chttp2_settings_parser_begin_frame(
   }
 }
 
-grpc_error* grpc_chttp2_settings_parser_parse(grpc_exec_ctx* exec_ctx, void* p,
-                                              grpc_chttp2_transport* t,
+grpc_error* grpc_chttp2_settings_parser_parse(void* p, grpc_chttp2_transport* t,
                                               grpc_chttp2_stream* s,
                                               grpc_slice slice, int is_last) {
   grpc_chttp2_settings_parser* parser = (grpc_chttp2_settings_parser*)p;
@@ -132,7 +131,7 @@ grpc_error* grpc_chttp2_settings_parser_parse(grpc_exec_ctx* exec_ctx, void* p,
                    GRPC_CHTTP2_NUM_SETTINGS * sizeof(uint32_t));
             grpc_slice_buffer_add(&t->qbuf, grpc_chttp2_settings_ack_create());
             if (t->notify_on_receive_settings != nullptr) {
-              GRPC_CLOSURE_SCHED(exec_ctx, t->notify_on_receive_settings,
+              GRPC_CLOSURE_SCHED(t->notify_on_receive_settings,
                                  GRPC_ERROR_NONE);
               t->notify_on_receive_settings = nullptr;
             }

src/core/ext/transport/chttp2/transport/frame_settings.h

@@ -52,8 +52,7 @@ grpc_slice grpc_chttp2_settings_ack_create(void);
 grpc_error* grpc_chttp2_settings_parser_begin_frame(
     grpc_chttp2_settings_parser* parser, uint32_t length, uint8_t flags,
     uint32_t* settings);
-grpc_error* grpc_chttp2_settings_parser_parse(grpc_exec_ctx* exec_ctx,
-                                              void* parser,
+grpc_error* grpc_chttp2_settings_parser_parse(void* parser,
                                               grpc_chttp2_transport* t,
                                               grpc_chttp2_stream* s,
                                               grpc_slice slice, int is_last);

src/core/ext/transport/chttp2/transport/frame_window_update.cc

@@ -64,9 +64,11 @@ grpc_error* grpc_chttp2_window_update_parser_begin_frame(
   return GRPC_ERROR_NONE;
 }
 
-grpc_error* grpc_chttp2_window_update_parser_parse(
-    grpc_exec_ctx* exec_ctx, void* parser, grpc_chttp2_transport* t,
-    grpc_chttp2_stream* s, grpc_slice slice, int is_last) {
+grpc_error* grpc_chttp2_window_update_parser_parse(void* parser,
+                                                   grpc_chttp2_transport* t,
+                                                   grpc_chttp2_stream* s,
+                                                   grpc_slice slice,
+                                                   int is_last) {
   uint8_t* const beg = GRPC_SLICE_START_PTR(slice);
   uint8_t* const end = GRPC_SLICE_END_PTR(slice);
   uint8_t* cur = beg;
@@ -98,10 +100,9 @@ grpc_error* grpc_chttp2_window_update_parser_parse(
       if (s != nullptr) {
         s->flow_control->RecvUpdate(received_update);
         if (grpc_chttp2_list_remove_stalled_by_stream(t, s)) {
-          grpc_chttp2_mark_stream_writable(exec_ctx, t, s);
+          grpc_chttp2_mark_stream_writable(t, s);
           grpc_chttp2_initiate_write(
-              exec_ctx, t,
-              GRPC_CHTTP2_INITIATE_WRITE_FLOW_CONTROL_UNSTALLED_BY_UPDATE);
+              t, GRPC_CHTTP2_INITIATE_WRITE_FLOW_CONTROL_UNSTALLED_BY_UPDATE);
         }
       }
     } else {
@@ -110,8 +111,7 @@ grpc_error* grpc_chttp2_window_update_parser_parse(
       bool is_zero = t->flow_control->remote_window() <= 0;
       if (was_zero && !is_zero) {
         grpc_chttp2_initiate_write(
-            exec_ctx, t,
-            GRPC_CHTTP2_INITIATE_WRITE_TRANSPORT_FLOW_CONTROL_UNSTALLED);
+            t, GRPC_CHTTP2_INITIATE_WRITE_TRANSPORT_FLOW_CONTROL_UNSTALLED);
       }
     }
   }

src/core/ext/transport/chttp2/transport/frame_window_update.h

@@ -35,8 +35,10 @@ grpc_slice grpc_chttp2_window_update_create(
 
 grpc_error* grpc_chttp2_window_update_parser_begin_frame(
     grpc_chttp2_window_update_parser* parser, uint32_t length, uint8_t flags);
-grpc_error* grpc_chttp2_window_update_parser_parse(
-    grpc_exec_ctx* exec_ctx, void* parser, grpc_chttp2_transport* t,
-    grpc_chttp2_stream* s, grpc_slice slice, int is_last);
+grpc_error* grpc_chttp2_window_update_parser_parse(void* parser,
+                                                   grpc_chttp2_transport* t,
+                                                   grpc_chttp2_stream* s,
+                                                   grpc_slice slice,
+                                                   int is_last);
 
 #endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_FRAME_WINDOW_UPDATE_H */