From b85354ee49569dcf5c10b965a14c1a4451e91edf Mon Sep 17 00:00:00 2001
From: ncteisen <ncteisen@gmail.com>
Date: Thu, 19 Apr 2018 12:01:06 -0700
Subject: [PATCH] Add in compile out tracers option

---
 src/core/lib/debug/trace.h | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/core/lib/debug/trace.h b/src/core/lib/debug/trace.h
index bfec92c529c..28157c6383d 100644
--- a/src/core/lib/debug/trace.h
+++ b/src/core/lib/debug/trace.h
@@ -57,13 +57,22 @@ class TraceFlag {
 
   const char* name() const { return name_; }
 
+// This following define may be commented out to ensure that the compiler
+// deletes any "if (tracer.enabled()) {...}" codeblocks. This is useful to
+// test the performance impact tracers have on the system.
+//
+// #define COMPILE_OUT_ALL_TRACERS_IN_OPT_BUILD
+#ifdef COMPILE_OUT_ALL_TRACERS_IN_OPT_BUILD
+  bool enabled() { return false; }
+#else
   bool enabled() {
 #ifdef GRPC_THREADSAFE_TRACER
     return gpr_atm_no_barrier_load(&value_) != 0;
 #else
     return value_;
-#endif
+#endif  // GRPC_THREADSAFE_TRACER
   }
+#endif  // COMPILE_OUT_ALL_TRACERS_IN_OPT_BUILD
 
  private:
   friend void grpc_core::testing::grpc_tracer_enable_flag(TraceFlag* flag);