[heap] New heuristics for starting of incremental marking.

src/heap/incremental-marking.h

 // 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.
 
 #ifndef V8_HEAP_INCREMENTAL_MARKING_H_
 #define V8_HEAP_INCREMENTAL_MARKING_H_
 
 #include "src/cancelable-task.h"
 #include "src/execution.h"
 #include "src/heap/heap.h"
@@ skipping 54 matching lines @@
   inline bool IsReadyToOverApproximateWeakClosure() const {
     return request_type_ == FINALIZATION && !finalize_marking_completed_;
   }
 
   GCRequestType request_type() const { return request_type_; }
 
   void reset_request_type() { request_type_ = NONE; }
 
   bool CanBeActivated();
 
-  bool ShouldActivateEvenWithoutIdleNotification();
-
   bool WasActivated();
 
   void Start(GarbageCollectionReason gc_reason);
 
   void FinalizeIncrementally();
 
   void UpdateMarkingDequeAfterScavenge();
 
   void Hurry();
 
@@ skipping 23 matching lines @@
   // heavy (color-checking) write barriers have been invoked.
   static const size_t kAllocatedThreshold = 64 * KB;
 
   static const int kStepSizeInMs = 1;
   static const int kMaxStepSizeInMs = 5;
 
   // This is the upper bound for how many times we allow finalization of
   // incremental marking to be postponed.
   static const int kMaxIdleMarkingDelayCounter = 3;
 
+#ifndef DEBUG
+  static const intptr_t kActivationThreshold = 8 * MB;
+#else
+  static const intptr_t kActivationThreshold = 0;
+#endif
+
   void FinalizeSweeping();
 
   size_t Step(size_t bytes_to_process, CompletionAction action,
               ForceCompletionAction completion, StepOrigin step_origin);
 
   inline void RestartIfNotMarking();
 
   static void RecordWriteFromCode(HeapObject* obj, Object** slot,
                                   Isolate* isolate);
 
@@ skipping 165 matching lines @@
   IncrementalMarkingJob incremental_marking_job_;
   Observer new_generation_observer_;
   Observer old_generation_observer_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(IncrementalMarking);
 };
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_INCREMENTAL_MARKING_H_