[experiments] enable work_serializer_dispatch (posix)

bazel/experiments.bzl

@@ -73,11 +73,9 @@ EXPERIMENTS = {
             ],
             "core_end2end_test": [
                 "promise_based_server_call",
-                "work_serializer_dispatch",
             ],
             "cpp_end2end_test": [
                 "promise_based_server_call",
-                "work_serializer_dispatch",
             ],
             "endpoint_test": [
                 "tcp_frame_size_tuning",
@@ -90,9 +88,6 @@ EXPERIMENTS = {
                 "tcp_frame_size_tuning",
                 "tcp_rcv_lowat",
             ],
-            "lb_unit_test": [
-                "work_serializer_dispatch",
-            ],
             "logging_test": [
                 "promise_based_server_call",
             ],
@@ -102,7 +97,6 @@ EXPERIMENTS = {
             ],
             "xds_end2end_test": [
                 "promise_based_server_call",
-                "work_serializer_dispatch",
             ],
         },
         "on": {
@@ -144,11 +138,9 @@ EXPERIMENTS = {
             ],
             "core_end2end_test": [
                 "promise_based_server_call",
-                "work_serializer_dispatch",
             ],
             "cpp_end2end_test": [
                 "promise_based_server_call",
-                "work_serializer_dispatch",
             ],
             "endpoint_test": [
                 "tcp_frame_size_tuning",
@@ -161,9 +153,6 @@ EXPERIMENTS = {
                 "tcp_frame_size_tuning",
                 "tcp_rcv_lowat",
             ],
-            "lb_unit_test": [
-                "work_serializer_dispatch",
-            ],
             "logging_test": [
                 "promise_based_server_call",
             ],
@@ -173,7 +162,6 @@ EXPERIMENTS = {
             ],
             "xds_end2end_test": [
                 "promise_based_server_call",
-                "work_serializer_dispatch",
             ],
         },
         "on": {
@@ -212,11 +200,9 @@ EXPERIMENTS = {
                 "event_engine_client",
                 "promise_based_client_call",
                 "promise_based_server_call",
-                "work_serializer_dispatch",
             ],
             "cpp_end2end_test": [
                 "promise_based_server_call",
-                "work_serializer_dispatch",
             ],
             "endpoint_test": [
                 "tcp_frame_size_tuning",
@@ -235,9 +221,6 @@ EXPERIMENTS = {
             "lame_client_test": [
                 "promise_based_client_call",
             ],
-            "lb_unit_test": [
-                "work_serializer_dispatch",
-            ],
             "logging_test": [
                 "promise_based_server_call",
             ],
@@ -247,7 +230,6 @@ EXPERIMENTS = {
             ],
             "xds_end2end_test": [
                 "promise_based_server_call",
-                "work_serializer_dispatch",
             ],
         },
         "on": {
@@ -256,6 +238,10 @@ EXPERIMENTS = {
             ],
             "core_end2end_test": [
                 "event_engine_listener",
+                "work_serializer_dispatch",
+            ],
+            "cpp_end2end_test": [
+                "work_serializer_dispatch",
             ],
             "cpp_lb_end2end_test": [
                 "pick_first_happy_eyeballs",
@@ -271,6 +257,7 @@ EXPERIMENTS = {
             "lb_unit_test": [
                 "pick_first_happy_eyeballs",
                 "round_robin_delegate_to_pick_first",
+                "work_serializer_dispatch",
                 "wrr_delegate_to_pick_first",
             ],
             "resolver_component_tests_runner_invoker": [
@@ -282,6 +269,7 @@ EXPERIMENTS = {
             "xds_end2end_test": [
                 "pick_first_happy_eyeballs",
                 "round_robin_delegate_to_pick_first",
+                "work_serializer_dispatch",
                 "wrr_delegate_to_pick_first",
             ],
         },

src/core/lib/experiments/experiments.cc

@@ -792,7 +792,7 @@ const ExperimentMetadata g_experiment_metadata[] = {
      true},
     {"work_serializer_dispatch", description_work_serializer_dispatch,
      additional_constraints_work_serializer_dispatch,
-     required_experiments_work_serializer_dispatch, 1, false, true},
+     required_experiments_work_serializer_dispatch, 1, true, true},
     {"wrr_delegate_to_pick_first", description_wrr_delegate_to_pick_first,
      additional_constraints_wrr_delegate_to_pick_first, nullptr, 0, true, true},
 };

src/core/lib/experiments/experiments.h

@@ -232,7 +232,8 @@ inline bool IsV3CompressionFilterEnabled() { return false; }
 inline bool IsV3ServerAuthFilterEnabled() { return false; }
 #define GRPC_EXPERIMENT_IS_INCLUDED_WORK_SERIALIZER_CLEARS_TIME_CACHE
 inline bool IsWorkSerializerClearsTimeCacheEnabled() { return true; }
-inline bool IsWorkSerializerDispatchEnabled() { return false; }
+#define GRPC_EXPERIMENT_IS_INCLUDED_WORK_SERIALIZER_DISPATCH
+inline bool IsWorkSerializerDispatchEnabled() { return true; }
 #define GRPC_EXPERIMENT_IS_INCLUDED_WRR_DELEGATE_TO_PICK_FIRST
 inline bool IsWrrDelegateToPickFirstEnabled() { return true; }
 #endif

src/core/lib/experiments/rollouts.yaml

@@ -123,6 +123,11 @@
 - name: work_serializer_clears_time_cache
   default: true
 - name: work_serializer_dispatch
-  default: false
+  default:
+    # TODO(ysseung): Not fully tested.
+    ios: broken
+    posix: true
+    # TODO(ysseung): Test flakes not fully resolved.
+    windows: broken
 - name: wrr_delegate_to_pick_first
   default: true