Don't unlink evacuation candidates before sweeping, move them to the end of their list of pages.

src/mark-compact.h

 // Copyright 2012 the V8 project authors. 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
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 709 matching lines @@
   class SweeperTask;
 
   explicit MarkCompactCollector(Heap* heap);
   ~MarkCompactCollector();
 
   bool MarkInvalidatedCode();
   bool WillBeDeoptimized(Code* code);
   void RemoveDeadInvalidatedCode();
   void ProcessInvalidatedCode(ObjectVisitor* visitor);
 
   void UnlinkEvacuationCandidates();

[Michael Starzinger, 2014/04/29 10:23:57]

nit: The unlink method is gone, let's remove the declaration.

[Hannes Payer (out of office), 2014/04/29 10:59:27]

Done.

   void ReleaseEvacuationCandidates();

[Michael Starzinger, 2014/04/29 10:23:57]

nit: The release method could be moved to near the others for readability.

[Hannes Payer (out of office), 2014/04/29 10:59:27]

Done.

 
   void StartSweeperThreads();
 
 #ifdef DEBUG
   enum CollectorState {
     IDLE,
     PREPARE_GC,
     MARK_LIVE_OBJECTS,
     SWEEP_SPACES,
     ENCODE_FORWARDING_ADDRESSES,
@@ skipping 169 matching lines @@
                                            NewSpacePage* p);
 
   void EvacuateNewSpace();
 
   void EvacuateLiveObjectsFromPage(Page* p);
 
   void EvacuatePages();
 
   void EvacuateNewSpaceAndCandidates();
 
+  void MoveEvacuationCandidatesToEndOfPagesList();
+
   void SweepSpace(PagedSpace* space, SweeperType sweeper);
 
   // Finalizes the parallel sweeping phase. Marks all the pages that were
   // swept in parallel.
   void ParallelSweepSpacesComplete();
 
   void ParallelSweepSpaceComplete(PagedSpace* space);
 
 #ifdef DEBUG
   friend class MarkObjectVisitor;
@@ skipping 77 matching lines @@
  private:
   MarkCompactCollector* collector_;
 };
 
 
 const char* AllocationSpaceName(AllocationSpace space);
 
 } }  // namespace v8::internal
 
 #endif  // V8_MARK_COMPACT_H_