Perform full GC if incremental marking is completed or marking deque is empty.

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/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/base/bits.h"
 #include "src/base/once.h"
@@ skipping 809 matching lines @@
 
   if (collector == MARK_COMPACTOR &&
       !mark_compact_collector()->abort_incremental_marking() &&
       !incremental_marking()->IsStopped() &&
       !incremental_marking()->should_hurry() &&
       FLAG_incremental_marking_steps) {
     // Make progress in incremental marking.
     const intptr_t kStepSizeWhenDelayedByScavenge = 1 * MB;
     incremental_marking()->Step(kStepSizeWhenDelayedByScavenge,
                                 IncrementalMarking::NO_GC_VIA_STACK_GUARD);
-    if (!incremental_marking()->IsComplete() && !FLAG_gc_global) {
+    if (!incremental_marking()->IsComplete() &&
+        !mark_compact_collector_.marking_deque_.IsEmpty() && !FLAG_gc_global) {

[jochen (gone - plz use gerrit), 2015/01/26 14:09:01]

should this check for overflow as well?

[Hannes Payer (out of office), 2015/01/26 14:52:45]

An overflowed marking deque will be full.

       if (FLAG_trace_incremental_marking) {
         PrintF("[IncrementalMarking] Delaying MarkSweep.\n");
       }
       collector = SCAVENGER;
       collector_reason = "incremental marking delaying mark-sweep";
     }
   }
 
   bool next_gc_likely_to_collect_more = false;
 
@@ skipping 5597 matching lines @@
       static_cast<int>(object_sizes_last_time_[index]));
   CODE_AGE_LIST_COMPLETE(ADJUST_LAST_TIME_OBJECT_COUNT)
 #undef ADJUST_LAST_TIME_OBJECT_COUNT
 
   MemCopy(object_counts_last_time_, object_counts_, sizeof(object_counts_));
   MemCopy(object_sizes_last_time_, object_sizes_, sizeof(object_sizes_));
   ClearObjectStats();
 }
 }
 }  // namespace v8::internal