[heap] Start concurrent marking simultaneously with incremental marking.

src/heap/heap.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/heap.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/assembler-inl.h"
 #include "src/ast/context-slot-cache.h"
@@ skipping 1335 matching lines @@
         // can cause another GC. Take into account the objects promoted during
         // GC.
         old_generation_allocation_counter_at_last_gc_ +=
             static_cast<size_t>(promoted_objects_size_);
         old_generation_size_at_last_gc_ = PromotedSpaceSizeOfObjects();
         break;
       case MINOR_MARK_COMPACTOR:
         MinorMarkCompact();
         break;
       case SCAVENGER:
-        if (fast_promotion_mode_ &&
-            CanExpandOldGeneration(new_space()->Size())) {
+        if ((fast_promotion_mode_ &&
+             CanExpandOldGeneration(new_space()->Size())) ||
+            concurrent_marking_->IsTaskPending()) {
           tracer()->NotifyYoungGenerationHandling(
               YoungGenerationHandling::kFastPromotionDuringScavenge);
           EvacuateYoungGeneration();
         } else {
           tracer()->NotifyYoungGenerationHandling(
               YoungGenerationHandling::kRegularScavenge);
 
           Scavenge();
         }
         break;
@@ skipping 251 matching lines @@
     }
     return NULL;
   }
 
  private:
   Heap* heap_;
 };
 
 void Heap::EvacuateYoungGeneration() {
   TRACE_GC(tracer(), GCTracer::Scope::SCAVENGER_EVACUATE);
-  DCHECK(fast_promotion_mode_);
-  DCHECK(CanExpandOldGeneration(new_space()->Size()));
+  if (!FLAG_concurrent_marking) {
+    DCHECK(fast_promotion_mode_);
+    DCHECK(CanExpandOldGeneration(new_space()->Size()));
+  }
 
   mark_compact_collector()->sweeper().EnsureNewSpaceCompleted();
 
   SetGCState(SCAVENGE);
   LOG(isolate_, ResourceEvent("scavenge", "begin"));
 
   // Move pages from new->old generation.
   PageRange range(new_space()->bottom(), new_space()->top());
   for (auto it = range.begin(); it != range.end();) {
     Page* p = (*++it)->prev_page();
@@ skipping 4763 matching lines @@
 }
 
 
 // static
 int Heap::GetStaticVisitorIdForMap(Map* map) {
   return StaticVisitorBase::GetVisitorId(map);
 }
 
 }  // namespace internal
 }  // namespace v8