Profile FreeList

Source/platform/heap/ThreadState.cpp

Index: Source/platform/heap/ThreadState.cpp
diff --git a/Source/platform/heap/ThreadState.cpp b/Source/platform/heap/ThreadState.cpp
index 0a29fb295bc67d7cb8c0d61452c16041a11a0b2a..15ff1f7b015cc7f13351cfefd824ce1f168dbd6e 100644
--- a/Source/platform/heap/ThreadState.cpp
+++ b/Source/platform/heap/ThreadState.cpp
@@ -40,7 +40,7 @@
 #include "public/platform/Platform.h"
 #include "public/platform/WebThread.h"
 #include "wtf/ThreadingPrimitives.h"
-#if ENABLE(GC_PROFILE_HEAP)
+#if ENABLE(GC_PROFILE_HEAP) || ENABLE(GC_PROFILE_FREE_LIST)
 #include "platform/TracedValue.h"
 #endif
 
@@ -619,6 +619,53 @@ const GCInfo* ThreadState::findGCInfo(Address address)
 }
 #endif
 
+#if ENABLE(GC_PROFILE_FREE_LIST)
+
+void ThreadState::snapshotFreeListIfNecessary()

[keishi, 2015/01/27 08:59:00]

Call when a snapshot could be recorded to the tracing json file.
Throttles to record only every 0.01 seconds.

+{
+    //bool gcTracingEnabled;
+    //TRACE_EVENT_CATEGORY_GROUP_ENABLED("blink_gc", &gcTracingEnabled);
+    //if (!gcTracingEnabled)
+    //    return;
+    const double kRecordInterval = 0.010; // seconds
+    static double nextRecordTime = monotonicallyIncreasingTime() + kRecordInterval;
+    if (monotonicallyIncreasingTime() > nextRecordTime) {
+        snapshotFreeList();
+        nextRecordTime = monotonicallyIncreasingTime() + kRecordInterval;
+    }
+}
+
+void ThreadState::snapshotFreeList()

[keishi, 2015/01/27 08:59:00]

Records the stats from the heap.

+{
+    RefPtr<TracedValue> json = TracedValue::create();
+
+#define SNAPSHOT_FREE_LIST(HeapType)                                       \
+    {                                                                      \
+        json->beginDictionary();                                           \
+        json->setString("name", #HeapType);                                \
+        m_heaps[HeapType##Heap]->snapshotFreeList(json.get());             \
+        json->endDictionary();                                             \
+        json->beginDictionary();                                           \
+        json->setString("name", #HeapType"NonFinalized");                  \
+        m_heaps[HeapType##HeapNonFinalized]->snapshotFreeList(json.get()); \
+        json->endDictionary();                                             \
+    }
+    json->beginArray("heaps");
+    SNAPSHOT_FREE_LIST(General1);
+    SNAPSHOT_FREE_LIST(General2);
+    SNAPSHOT_FREE_LIST(General3);
+    SNAPSHOT_FREE_LIST(General4);
+    SNAPSHOT_FREE_LIST(VectorBacking);
+    SNAPSHOT_FREE_LIST(HashTableBacking);
+    FOR_EACH_TYPED_HEAP(SNAPSHOT_FREE_LIST);
+    json->endArray();
+#undef SNAPSHOT_FREE_LIST
+
+    TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID("blink_gc", "FreeList", this, json.release());
+}
+
+#endif
+
 #if ENABLE(GC_PROFILE_HEAP)
 size_t ThreadState::SnapshotInfo::getClassTag(const GCInfo* gcinfo)
 {
@@ -1015,7 +1062,7 @@ void ThreadState::performPendingSweep()
 {
     if (!sweepRequested())
         return;
-
+    Heap::reportSweepingStats();

[keishi, 2015/01/27 08:59:00]

Report stats on the objects that will be sweeped.

 #if ENABLE(GC_PROFILE_HEAP)
     // We snapshot the heap prior to sweeping to get numbers for both resources
     // that have been allocated since the last GC and for resources that are
@@ -1090,6 +1137,9 @@ void ThreadState::performPendingSweep()
         TRACE_EVENT_SET_NONCONST_SAMPLING_STATE(samplingState);
         ScriptForbiddenScope::exit();
     }
+#if ENABLE(GC_PROFILE_FREE_LIST)
+    snapshotFreeListIfNecessary();
+#endif
 }
 
 void ThreadState::addInterruptor(Interruptor* interruptor)