[heap] Start concurrent marking simultaneously with incremental marking.

src/heap/mark-compact.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/mark-compact.h"
 
 #include "src/base/atomicops.h"
 #include "src/base/bits.h"
 #include "src/base/sys-info.h"
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
 #include "src/deoptimizer.h"
 #include "src/execution.h"
 #include "src/frames-inl.h"
 #include "src/gdb-jit.h"
 #include "src/global-handles.h"
 #include "src/heap/array-buffer-tracker.h"
+#include "src/heap/concurrent-marking.h"
 #include "src/heap/gc-tracer.h"
 #include "src/heap/incremental-marking.h"
 #include "src/heap/mark-compact-inl.h"
 #include "src/heap/object-stats.h"
 #include "src/heap/objects-visiting-inl.h"
 #include "src/heap/objects-visiting.h"
 #include "src/heap/page-parallel-job.h"
 #include "src/heap/spaces-inl.h"
 #include "src/ic/ic.h"
 #include "src/ic/stub-cache.h"
@@ skipping 745 matching lines @@
   EnsureSweepingCompleted();
 
   if (heap()->incremental_marking()->IsSweeping()) {
     heap()->incremental_marking()->Stop();
   }
 
   // If concurrent unmapping tasks are still running, we should wait for
   // them here.
   heap()->memory_allocator()->unmapper()->WaitUntilCompleted();
 
+  if (FLAG_concurrent_marking &&

[Hannes Payer (out of office), 2017/03/08 12:58:50]

Maybe we should have an EnsureMarkingCompleted() method then it would be similar
to sweeping.

[ulan, 2017/03/10 16:45:27]

Done.

+      heap()->concurrent_marking()->IsMarkingInProgress()) {
+    heap()->concurrent_marking()->WaitForTaskToComplete();
+  }
+
   // Clear marking bits if incremental marking is aborted.
   if (was_marked_incrementally_ && heap_->ShouldAbortIncrementalMarking()) {
     heap()->incremental_marking()->Stop();
     heap()->incremental_marking()->AbortBlackAllocation();
     ClearMarkbits();
     AbortWeakCollections();
     AbortWeakCells();
     AbortTransitionArrays();
     AbortCompaction();
     heap_->local_embedder_heap_tracer()->AbortTracing();
@@ skipping 3229 matching lines @@
       // The target is always in old space, we don't have to record the slot in
       // the old-to-new remembered set.
       DCHECK(!heap()->InNewSpace(target));
       RecordRelocSlot(host, &rinfo, target);
     }
   }
 }
 
 }  // namespace internal
 }  // namespace v8