[counters] adding runtime call timers for GC

src/heap/gc-tracer.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/heap/gc-tracer.h"
 
 #include "src/counters.h"
 #include "src/heap/heap-inl.h"
 #include "src/isolate.h"
 
 namespace v8 {
 namespace internal {
 
 static intptr_t CountTotalHolesSize(Heap* heap) {
   intptr_t holes_size = 0;
   OldSpaces spaces(heap);
   for (OldSpace* space = spaces.next(); space != NULL; space = spaces.next()) {
     holes_size += space->Waste() + space->Available();
   }
   return holes_size;
 }
 
 
 GCTracer::Scope::Scope(GCTracer* tracer, ScopeId scope)
     : tracer_(tracer), scope_(scope) {
   start_time_ = tracer_->heap_->MonotonicallyIncreasingTimeInMs();
+  // TODO(cbruni): remove once we fully moved to a trace-based system.
+  if (FLAG_runtime_call_stats) {
+    RuntimeCallStats* stats =
+        tracer_->heap_->isolate()->counters()->runtime_call_stats();
+    timer_.Initialize(&stats->GC, stats->current_timer());
+    stats->Enter(&timer_);
+  }
 }
 
 
 GCTracer::Scope::~Scope() {
   DCHECK(scope_ < NUMBER_OF_SCOPES);  // scope_ is unsigned.
   tracer_->current_.scopes[scope_] +=
       tracer_->heap_->MonotonicallyIncreasingTimeInMs() - start_time_;
+  // TODO(cbruni): remove once we fully moved to a trace-based system.
+  if (FLAG_runtime_call_stats) {
+    tracer_->heap_->isolate()->counters()->runtime_call_stats()->Leave(&timer_);
+  }
 }
 
 
 GCTracer::AllocationEvent::AllocationEvent(double duration,
                                            size_t allocation_in_bytes) {
   duration_ = duration;
   allocation_in_bytes_ = allocation_in_bytes;
 }
 
 
@@ skipping 876 matching lines @@
 
 
 bool GCTracer::SurvivalEventsRecorded() const {
   return survival_events_.size() > 0;
 }
 
 
 void GCTracer::ResetSurvivalEvents() { survival_events_.reset(); }
 }  // namespace internal
 }  // namespace v8