[heap] Pause black allocation during GCs

src/heap/incremental-marking.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/heap/incremental-marking.h"
 
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
 #include "src/conversions.h"
 #include "src/heap/concurrent-marking.h"
@@ skipping 555 matching lines @@
   black_allocation_ = true;
   heap()->old_space()->MarkAllocationInfoBlack();
   heap()->map_space()->MarkAllocationInfoBlack();
   heap()->code_space()->MarkAllocationInfoBlack();
   if (FLAG_trace_incremental_marking) {
     heap()->isolate()->PrintWithTimestamp(
         "[IncrementalMarking] Black allocation started\n");
   }
 }
 
+void IncrementalMarking::PauseBlackAllocation() {
+  DCHECK(FLAG_black_allocation);
+  DCHECK(IsMarking());
+  heap()->old_space()->UnmarkAllocationInfo();
+  heap()->map_space()->UnmarkAllocationInfo();
+  heap()->code_space()->UnmarkAllocationInfo();
+  if (FLAG_trace_incremental_marking) {
+    heap()->isolate()->PrintWithTimestamp(
+        "[IncrementalMarking] Black allocation paused\n");
+  }
+  black_allocation_ = false;
+}
+
 void IncrementalMarking::FinishBlackAllocation() {
   if (black_allocation_) {
     black_allocation_ = false;
     if (FLAG_trace_incremental_marking) {
       heap()->isolate()->PrintWithTimestamp(
           "[IncrementalMarking] Black allocation finished\n");
     }
   }
 }
 
@@ skipping 577 matching lines @@
   idle_marking_delay_counter_++;
 }
 
 
 void IncrementalMarking::ClearIdleMarkingDelayCounter() {
   idle_marking_delay_counter_ = 0;
 }
 
 }  // namespace internal
 }  // namespace v8