Report DOM partitionAlloc size to V8 GC.

Source/core/dom/Node.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 88 matching lines @@
 using namespace std;
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
 #if !ENABLE(OILPAN)
 void* Node::operator new(size_t size)
 {
     ASSERT(isMainThread());
-    return partitionAlloc(Partitions::getObjectModelPartition(), size);
+    void* ptr = partitionAlloc(Partitions::getObjectModelPartition(), size);
+    Partitions::addDOMMemoryUsage(partitionAllocGetSize(ptr));

[haraken, 2014/05/28 07:11:34]

Won't this affect performance? I think this call path is very
performance-sensitive.

I think you can check performance using Dromaeo/dom-*.

[kouhei (in TOK), 2014/05/28 07:35:20]

Ack. Will test.

[esprehn, 2014/05/28 08:38:14]

Lots of nodes are not reachable or even reclaimable by v8.

[Hannes Payer (out of office), 2014/05/28 11:00:07]

Is this call here causing the reported performance degradation on Dromeo?

[eseidel, 2014/05/29 05:49:49]

Why would you want to report it during Node alloc?  Why not report it to v8
every time partitionAlloc allocs a new superpage or some other semi-infrequent
allocation from partitionAlloc directly?  Doesn't V8 want to know about memory
pressure from the entire renderer?

+    return ptr;
 }
 
 void Node::operator delete(void* ptr)
 {
     ASSERT(isMainThread());
+    Partitions::subtractDOMMemoryUsage(partitionAllocGetSize(ptr));
     partitionFree(ptr);
 }
 #endif
 
 #if DUMP_NODE_STATISTICS
 static HashSet<Node*> liveNodeSet;
 #endif
 
 void Node::dumpStatistics()
 {
@@ skipping 2453 matching lines @@
         node->showTreeForThis();
 }
 
 void showNodePath(const WebCore::Node* node)
 {
     if (node)
         node->showNodePathForThis();
 }
 
 #endif