Oilpan: GC profiling.

Source/platform/heap/Profiling.h

Index: Source/platform/heap/Profiling.h
diff --git a/Source/platform/heap/Profiling.h b/Source/platform/heap/Profiling.h
new file mode 100644
index 0000000000000000000000000000000000000000..aecbe3c6fac7954de17d5ef577f20764f3a08ebb
--- /dev/null
+++ b/Source/platform/heap/Profiling.h
@@ -0,0 +1,21 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef Profiling_h
+#define Profiling_h
+
+// Name for about:tracing events
+#define GC_PROFILE_GROUP "BlinkGC"

[haraken, 2014/07/14 02:26:14]

"BlinkGC" => "blinkGC" (due to a convention of trace event names)

Also we normally hard-code the name when using trace event macros.

[zerny-chromium, 2014/07/28 11:54:41]

Done, but kept the macro so we avoid search-replace on a string key for a const
name that will likely change again.

+
+// Extended profiling of memory usage.
+#define GC_PROFILE_HEAP ENABLE(GC_PROFILING_HEAP)

[haraken, 2014/07/14 02:26:14]

Blink normally doesn't use this kind of re-define. Shall we use
ENABLE(GC_PROFILING_HEAP) as is?

[zerny-chromium, 2014/07/28 11:54:41]

I can do that. The reasoning for having the two distinct types was that we can
more easily split the GC_PROFILE_HEAP into several sub #defs (such as _FAST and
_SLOW) independent of the GYP flag/naming. Should I change it or keep it?

[haraken, 2014/07/28 17:45:47]

If the split does really matter, I'm OK with introducing GC_PROFILE_HEAP.
However, otherwise I'd prefer just using ENABLE(GC_PROFILING_HEAP), following
other Blink code base. I guess it's important to follow existing conventions.

Actually I hope this file is gone since this file is just redefining macros.

+#define GC_PROFILE_HEAP_PAGE_DUMP_THRESHOLD 0
+
+// Extended profiling of GC marking/tracing
+#define GC_PROFILE_MARKING ENABLE(GC_PROFILING_MARKING)

[haraken, 2014/07/14 02:26:14]

Ditto.

+
+// Dependencies for several profiling usages.
+#define GC_PROFILE_DEFINE_CLASSNAME (GC_PROFILE_HEAP || GC_PROFILE_MARKING)
+
+#endif