[heap] Adding fine grained timer scopes to external callbacks.

src/heap/gc-tracer.h

 // 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.
 
 #ifndef V8_HEAP_GC_TRACER_H_
 #define V8_HEAP_GC_TRACER_H_
 
 #include "src/base/platform/platform.h"
 #include "src/globals.h"
 
@@ skipping 79 matching lines @@
 
 
 // GCTracer collects and prints ONE line after each garbage collector
 // invocation IFF --trace_gc is used.
 // TODO(ernstm): Unit tests.
 class GCTracer {
  public:
   class Scope {
    public:
     enum ScopeId {
-      EXTERNAL,
+      EXTERNAL_WEAK_GLOBAL_HANDLES,
       MC_CLEAR,
       MC_CLEAR_CODE_FLUSH,
       MC_CLEAR_DEPENDENT_CODE,
       MC_CLEAR_GLOBAL_HANDLES,
       MC_CLEAR_MAPS,
       MC_CLEAR_SLOTS_BUFFER,
       MC_CLEAR_STORE_BUFFER,
       MC_CLEAR_STRING_TABLE,
       MC_CLEAR_WEAK_CELLS,
       MC_CLEAR_WEAK_COLLECTIONS,
       MC_CLEAR_WEAK_LISTS,
       MC_EVACUATE,
       MC_EVACUATE_CANDIDATES,
       MC_EVACUATE_CLEAN_UP,
       MC_EVACUATE_COPY,
       MC_EVACUATE_UPDATE_POINTERS,
       MC_EVACUATE_UPDATE_POINTERS_BETWEEN_EVACUATED,
       MC_EVACUATE_UPDATE_POINTERS_TO_EVACUATED,
       MC_EVACUATE_UPDATE_POINTERS_TO_NEW,
       MC_EVACUATE_UPDATE_POINTERS_WEAK,
+      MC_EXTERNAL_EPILOGUE,
+      MC_EXTERNAL_PROLOGUE,
       MC_FINISH,
       MC_INCREMENTAL_FINALIZE,
+      MC_INCREMENTAL_EXTERNAL_EPILOGUE,
+      MC_INCREMENTAL_EXTERNAL_PROLOGUE,
       MC_MARK,
       MC_MARK_FINISH_INCREMENTAL,
       MC_MARK_PREPARE_CODE_FLUSH,
       MC_MARK_ROOTS,
       MC_MARK_WEAK_CLOSURE,
       MC_SWEEP,
       MC_SWEEP_CODE,
       MC_SWEEP_MAP,
       MC_SWEEP_OLD,
       SCAVENGER_CODE_FLUSH_CANDIDATES,
+      SCAVENGER_EXTERNAL_EPILOGUE,
+      SCAVENGER_EXTERNAL_PROLOGUE,
       SCAVENGER_OBJECT_GROUPS,
       SCAVENGER_OLD_TO_NEW_POINTERS,
       SCAVENGER_ROOTS,
       SCAVENGER_SCAVENGE,
       SCAVENGER_SEMISPACE,
       SCAVENGER_WEAK,
       NUMBER_OF_SCOPES
     };
 
     Scope(GCTracer* tracer, ScopeId scope);
@@ skipping 356 matching lines @@
     cumulative_incremental_marking_duration_ = 0;
     cumulative_pure_incremental_marking_duration_ = 0;
     longest_incremental_marking_step_ = 0;
     cumulative_incremental_marking_finalization_steps_ = 0;
     cumulative_incremental_marking_finalization_duration_ = 0;
     longest_incremental_marking_finalization_step_ = 0;
     cumulative_marking_duration_ = 0;
     cumulative_sweeping_duration_ = 0;
   }
 
+  double TotalExternalTime() const {
+    return current_.scopes[Scope::EXTERNAL_WEAK_GLOBAL_HANDLES] +
+           current_.scopes[Scope::MC_EXTERNAL_EPILOGUE] +
+           current_.scopes[Scope::MC_EXTERNAL_PROLOGUE] +
+           current_.scopes[Scope::MC_INCREMENTAL_EXTERNAL_EPILOGUE] +
+           current_.scopes[Scope::MC_INCREMENTAL_EXTERNAL_PROLOGUE] +
+           current_.scopes[Scope::SCAVENGER_EXTERNAL_EPILOGUE] +
+           current_.scopes[Scope::SCAVENGER_EXTERNAL_PROLOGUE];
+  }
+
   // Pointer to the heap that owns this tracer.
   Heap* heap_;
 
   // Current tracer event. Populated during Start/Stop cycle. Valid after Stop()
   // has returned.
   Event current_;
 
   // Previous tracer event.
   Event previous_;
 
@@ skipping 77 matching lines @@
 
   // Counts how many tracers were started without stopping.
   int start_counter_;
 
   DISALLOW_COPY_AND_ASSIGN(GCTracer);
 };
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_GC_TRACER_H_