Oilpan: Reduce the reserved size of CallbackStacks

third_party/WebKit/Source/platform/heap/Heap.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 140 matching lines @@
 };
 
 void Heap::flushHeapDoesNotContainCache()
 {
     s_heapDoesNotContainCache->flush();
 }
 
 void Heap::init()
 {
     ThreadState::init();
-    s_markingStack = new CallbackStack();
-    s_postMarkingCallbackStack = new CallbackStack();
-    s_globalWeakCallbackStack = new CallbackStack();
-    s_ephemeronStack = new CallbackStack();
+    s_markingStack = new CallbackStack(4096);

[sof, 2016/02/14 21:47:03]

These are fairly arbitrary numbers, are they based on experiments showing that
these are reasonable averages / N-percentile of what's commonly seen?

+    s_postMarkingCallbackStack = new CallbackStack(128);
+    s_globalWeakCallbackStack = new CallbackStack(2048);
+    s_ephemeronStack = new CallbackStack(128);
     s_heapDoesNotContainCache = new HeapDoesNotContainCache();
     s_freePagePool = new FreePagePool();
     s_orphanedPagePool = new OrphanedPagePool();
     s_allocatedSpace = 0;
     s_allocatedObjectSize = 0;
     s_objectSizeAtLastGC = 0;
     s_markedObjectSize = 0;
     s_markedObjectSizeAtLastCompleteSweep = 0;
     s_wrapperCount = 0;
     s_wrapperCountAtLastGC = 0;
@@ skipping 185 matching lines @@
     ASSERT(!ThreadState::current()->isInGC());
     for (ThreadState* state : ThreadState::attachedThreads())
         state->preGC();
 }
 
 void Heap::postGC(BlinkGC::GCType gcType)
 {
     ASSERT(ThreadState::current()->isInGC());
     for (ThreadState* state : ThreadState::attachedThreads())
         state->postGC(gcType);
+
+    ASSERT(s_markingStack->isEmpty());
+    ASSERT(s_postMarkingCallbackStack->isEmpty());
+    ASSERT(s_globalWeakCallbackStack->isEmpty());
+    ASSERT(s_ephemeronStack->isEmpty());
 }
 
 const char* Heap::gcReasonString(BlinkGC::GCReason reason)
 {
     switch (reason) {
     case BlinkGC::IdleGC:
         return "IdleGC";
     case BlinkGC::PreciseGC:
         return "PreciseGC";
     case BlinkGC::ConservativeGC:
@@ skipping 346 matching lines @@
 size_t Heap::s_wrapperCountAtLastGC = 0;
 size_t Heap::s_collectedWrapperCount = 0;
 size_t Heap::s_partitionAllocSizeAtLastGC = 0;
 double Heap::s_estimatedMarkingTimePerByte = 0.0;
 bool Heap::s_isLowEndDevice = false;
 #if ENABLE(ASSERT)
 uint16_t Heap::s_gcGeneration = 0;
 #endif
 
 } // namespace blink