Use just one marking deque.

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/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/base/bits.h"
 #include "src/base/once.h"
@@ skipping 750 matching lines @@
   const int kMinNumberOfAttempts = 2;
   for (int attempt = 0; attempt < kMaxNumberOfAttempts; attempt++) {
     if (!CollectGarbage(MARK_COMPACTOR, gc_reason, NULL) &&
         attempt + 1 >= kMinNumberOfAttempts) {
       break;
     }
   }
   mark_compact_collector()->SetFlags(kNoGCFlags);
   new_space_.Shrink();
   UncommitFromSpace();
-  incremental_marking()->UncommitMarkingDeque();
 }
 
 
 void Heap::EnsureFillerObjectAtTop() {
   // There may be an allocation memento behind every object in new space.
   // If we evacuate a not full new space or if we are on the last page of
   // the new space, then there may be uninitialized memory behind the top
   // pointer of the new space page. We store a filler object there to
   // identify the unused space.
   Address from_top = new_space_.top();
@@ skipping 344 matching lines @@
 
   // Update relocatables.
   Relocatable::PostGarbageCollectionProcessing(isolate_);
 
   if (collector == MARK_COMPACTOR) {
     // Register the amount of external allocated memory.
     amount_of_external_allocated_memory_at_last_global_gc_ =
         amount_of_external_allocated_memory_;
     old_generation_allocation_limit_ = OldGenerationAllocationLimit(
         PromotedSpaceSizeOfObjects(), freed_global_handles);
+    // We finished a marking cycle. We can uncommit the marking deque until
+    // we start marking again.
+    mark_compact_collector_.UncommitMarkingDeque();
   }
 
   {
     GCCallbacksScope scope(this);
     if (scope.CheckReenter()) {
       AllowHeapAllocation allow_allocation;
       GCTracer::Scope scope(tracer(), GCTracer::Scope::EXTERNAL);
       VMState<EXTERNAL> state(isolate_);
       HandleScope handle_scope(isolate_);
       CallGCEpilogueCallbacks(gc_type, gc_callback_flags);
@@ skipping 3257 matching lines @@
     new_space_.Shrink();
     UncommitFromSpace();
   }
 }
 
 
 void Heap::TryFinalizeIdleIncrementalMarking(
     double idle_time_in_ms, size_t size_of_objects,
     size_t final_incremental_mark_compact_speed_in_bytes_per_ms) {
   if (incremental_marking()->IsComplete() ||
-      (incremental_marking()->IsMarkingDequeEmpty() &&
+      (mark_compact_collector_.marking_deque()->IsEmpty() &&
        gc_idle_time_handler_.ShouldDoFinalIncrementalMarkCompact(
            static_cast<size_t>(idle_time_in_ms), size_of_objects,
            final_incremental_mark_compact_speed_in_bytes_per_ms))) {
     CollectAllGarbage(kNoGCFlags, "idle notification: finalize incremental");
   }
 }
 
 
 bool Heap::WorthActivatingIncrementalMarking() {
   return incremental_marking()->IsStopped() &&
@@ skipping 1076 matching lines @@
     property_cell_space_ = NULL;
   }
 
   if (lo_space_ != NULL) {
     lo_space_->TearDown();
     delete lo_space_;
     lo_space_ = NULL;
   }
 
   store_buffer()->TearDown();
-  incremental_marking()->TearDown();
 
   isolate_->memory_allocator()->TearDown();
 }
 
 
 void Heap::AddGCPrologueCallback(v8::Isolate::GCPrologueCallback callback,
                                  GCType gc_type, bool pass_isolate) {
   DCHECK(callback != NULL);
   GCPrologueCallbackPair pair(callback, gc_type, pass_isolate);
   DCHECK(!gc_prologue_callbacks_.Contains(pair));
@@ skipping 847 matching lines @@
       static_cast<int>(object_sizes_last_time_[index]));
   CODE_AGE_LIST_COMPLETE(ADJUST_LAST_TIME_OBJECT_COUNT)
 #undef ADJUST_LAST_TIME_OBJECT_COUNT
 
   MemCopy(object_counts_last_time_, object_counts_, sizeof(object_counts_));
   MemCopy(object_sizes_last_time_, object_sizes_, sizeof(object_sizes_));
   ClearObjectStats();
 }
 }
 }  // namespace v8::internal