[heap] Add specific timer events for finalizing incremental GCs.

src/heap/heap.cc

 // Copyright 2012 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/heap.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/base/bits.h"
 #include "src/base/once.h"
@@ skipping 801 matching lines @@
       AllowHeapAllocation allow_allocation;
       GCTracer::Scope scope(tracer(), GCTracer::Scope::EXTERNAL);
       VMState<EXTERNAL> state(isolate_);
       HandleScope handle_scope(isolate_);
       CallGCEpilogueCallbacks(kGCTypeIncrementalMarking, kNoGCCallbackFlags);
     }
   }
 }
 
 
+HistogramTimer* Heap::GCTypeTimer(GarbageCollector collector) {
+  if (collector == SCAVENGER) {
+    return isolate_->counters()->gc_scavenger();
+  } else {
+    if (!incremental_marking()->IsStopped()) {
+      if (ShouldReduceMemory()) {
+        return isolate_->counters()->gc_finalize_reduce_memory();
+      } else {
+        return isolate_->counters()->gc_finalize();
+      }
+    } else {
+      return isolate_->counters()->gc_compactor();
+    }
+  }
+}
+
+
 void Heap::CollectAllGarbage(int flags, const char* gc_reason,
                              const v8::GCCallbackFlags gc_callback_flags) {
   // Since we are ignoring the return value, the exact choice of space does
   // not matter, so long as we do not specify NEW_SPACE, which would not
   // cause a full GC.
   set_current_gc_flags(flags);
   CollectGarbage(OLD_SPACE, gc_reason, gc_callback_flags);
   set_current_gc_flags(kNoGCFlags);
 }
 
@@ skipping 125 matching lines @@
     committed_memory_before = CommittedOldGenerationMemory();
   }
 
   {
     tracer()->Start(collector, gc_reason, collector_reason);
     DCHECK(AllowHeapAllocation::IsAllowed());
     DisallowHeapAllocation no_allocation_during_gc;
     GarbageCollectionPrologue();
 
     {
-      HistogramTimerScope histogram_timer_scope(
-          (collector == SCAVENGER) ? isolate_->counters()->gc_scavenger()
-                                   : isolate_->counters()->gc_compactor());
+      HistogramTimerScope histogram_timer_scope(GCTypeTimer(collector));
+
       next_gc_likely_to_collect_more =
           PerformGarbageCollection(collector, gc_callback_flags);
     }
 
     GarbageCollectionEpilogue();
     if (collector == MARK_COMPACTOR && FLAG_track_detached_contexts) {
       isolate()->CheckDetachedContextsAfterGC();
     }
 
     if (collector == MARK_COMPACTOR) {
@@ skipping 5109 matching lines @@
 }
 
 
 // static
 int Heap::GetStaticVisitorIdForMap(Map* map) {
   return StaticVisitorBase::GetVisitorId(map);
 }
 
 }  // namespace internal
 }  // namespace v8