Oilpan: Schedule a precise GC when a page navigates

Source/core/loader/FrameLoader.cpp

Index: Source/core/loader/FrameLoader.cpp
diff --git a/Source/core/loader/FrameLoader.cpp b/Source/core/loader/FrameLoader.cpp
index b81267c0ef5fb128740650103d36f04f08db84c6..98d64ef03883afd3e99427139982f4b08b8a5a57 100644
--- a/Source/core/loader/FrameLoader.cpp
+++ b/Source/core/loader/FrameLoader.cpp
@@ -1027,6 +1027,19 @@ bool FrameLoader::prepareForCommit()
     PluginScriptForbiddenScope forbidPluginDestructorScripting;
     RefPtrWillBeRawPtr<DocumentLoader> pdl = m_provisionalDocumentLoader;
 
+    if (m_frame->document()) {
+        unsigned totalNodeCount = InstanceCounters::counterValue(InstanceCounters::NodeCounter);
+        int nodeCount = static_cast<int>(totalNodeCount);
+        for (Document* document : Document::liveDocumentSet()) {
+            if (document != m_frame->document())
+                nodeCount -= document->nodeCount();
+        }
+        ASSERT(nodeCount >= 0);
+        float ratio = static_cast<float>(nodeCount) / totalNodeCount;
+        if (ThreadState::current()->shouldSchedulePreciseGCOnNavigation(ratio))
+            ThreadState::current()->schedulePreciseGC();

[haraken, 2015/08/03 01:03:59]

Shall we change the signature to schedulePageNavigationGCIfNeeded(ratio) (which
calls schedulePreciseGC if the ratio meets the predicate)?

[keishi, 2015/08/06 06:59:14]

Done.

+    }
+
     if (m_documentLoader) {
         client()->dispatchWillClose();
         dispatchUnloadEvent();