Oilpan: Schedule an idle garbage collection after receiving the kGCCallbackScheduleIdleGarbageColle…

third_party/WebKit/Source/bindings/core/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 423 matching lines @@
         (flags & v8::kGCCallbackFlagCollectAllExternalMemory)) {
       // This single GC is not enough. See the above comment.
       current_thread_state->CollectGarbage(BlinkGC::kHeapPointersOnStack,
                                            BlinkGC::kGCWithSweep,
                                            BlinkGC::kForcedGC);
 
       // The conservative GC might have left floating garbage. Schedule
       // precise GC to ensure that we collect all available garbage.
       current_thread_state->SchedulePreciseGC();
     }
+
+    if (flags & v8::kGCCallbackScheduleIdleGarbageCollection) {

[haraken, 2017/05/08 23:56:23]

Add a comment about what this is doing.

[Hannes Payer (out of office), 2017/05/09 06:47:15]

Done.

+      current_thread_state->ScheduleIdleGC();
+    }
   }
 
   TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"),
                        "UpdateCounters", TRACE_EVENT_SCOPE_THREAD, "data",
                        InspectorUpdateCountersEvent::Data());
 }
 
 void V8GCController::CollectGarbage(v8::Isolate* isolate, bool only_minor_gc) {
   v8::HandleScope handle_scope(isolate);
   RefPtr<ScriptState> script_state = ScriptState::Create(
@@ skipping 99 matching lines @@
   double start_time = WTF::CurrentTimeMS();
   v8::HandleScope scope(isolate);
   PendingActivityVisitor visitor(isolate, execution_context);
   ToIsolate(execution_context)->VisitHandlesWithClassIds(&visitor);
   scan_pending_activity_histogram.Count(
       static_cast<int>(WTF::CurrentTimeMS() - start_time));
   return visitor.PendingActivityFound();
 }
 
 }  // namespace blink