Report DOM partitionAlloc size to V8 GC.

Source/bindings/v8/V8GCController.cpp

 /*
  * Copyright (C) 2009 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 30 matching lines @@
 #include "bindings/v8/WrapperTypeInfo.h"
 #include "core/dom/Attr.h"
 #include "core/dom/NodeTraversal.h"
 #include "core/dom/TemplateContentDocumentFragment.h"
 #include "core/dom/shadow/ElementShadow.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/html/HTMLImageElement.h"
 #include "core/html/HTMLTemplateElement.h"
 #include "core/inspector/InspectorTraceEvents.h"
 #include "core/svg/SVGElement.h"
+#include "platform/Partitions.h"
 #include "platform/TraceEvent.h"
 
 namespace WebCore {
 
 // FIXME: This should use opaque GC roots.
 static void addReferencesForNodeWithEventListeners(v8::Isolate* isolate, Node* node, const v8::Persistent<v8::Object>& wrapper)
 {
     ASSERT(node->hasEventListeners());
 
     EventListenerIterator iterator(node);
@@ skipping 251 matching lines @@
     v8::HeapStatistics heapStatistics;
     isolate->GetHeapStatistics(&heapStatistics);
     return heapStatistics.used_heap_size();
 }
 
 void V8GCController::gcPrologue(v8::GCType type, v8::GCCallbackFlags flags)
 {
     // FIXME: It would be nice if the GC callbacks passed the Isolate directly....
     v8::Isolate* isolate = v8::Isolate::GetCurrent();
     TRACE_EVENT_BEGIN1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "GCEvent", "usedHeapSizeBefore", usedHeapSize(isolate));
+    reportDOMMemoryUsageToV8(isolate);
     if (type == v8::kGCTypeScavenge)
         minorGCPrologue(isolate);
     else if (type == v8::kGCTypeMarkSweepCompact)
         majorGCPrologue(flags & v8::kGCCallbackFlagConstructRetainedObjectInfos, isolate);
 }
 
 void V8GCController::minorGCPrologue(v8::Isolate* isolate)
 {
     TRACE_EVENT_BEGIN0("v8", "minorGC");
     if (isMainThread()) {
@@ skipping 78 matching lines @@
     if (isMainThread())
         TRACE_EVENT_SET_NONCONST_SAMPLING_STATE(V8PerIsolateData::from(isolate)->previousSamplingState());
 }
 
 void V8GCController::collectGarbage(v8::Isolate* isolate)
 {
     V8ExecutionScope scope(isolate);
     V8ScriptRunner::compileAndRunInternalScript(v8String(isolate, "if (gc) gc();"), isolate);
 }
 
+void V8GCController::reportDOMMemoryUsageToV8(v8::Isolate* isolate)
+{
+    if (!isMainThread())

[jochen (gone - plz use gerrit), 2014/05/28 07:23:03]

why?

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

We only want to notify main thread isolate, as all DOM Node objects should be in
main thread.

+        return;
+
+    static size_t lastUsageReportedToV8 = 0;
+
+    size_t currentUsage = Partitions::currentDOMMemoryUsage();
+    ssize_t diff = static_cast<ssize_t>(currentUsage) - static_cast<ssize_t>(lastUsageReportedToV8);
+    isolate->AdjustAmountOfExternalAllocatedMemory(diff);
+
+    lastUsageReportedToV8 = currentUsage;
+}
+
 }  // namespace WebCore