*** old/src/share/vm/gc_implementation/parallelScavenge/psScavenge.cpp	Thu May 30 11:15:51 2013
--- new/src/share/vm/gc_implementation/parallelScavenge/psScavenge.cpp	Thu May 30 11:15:51 2013

*** 59,79 ****
--- 59,80 ----
  ReferenceProcessor*        PSScavenge::_ref_processor = NULL;
  CardTableExtension*        PSScavenge::_card_table = NULL;
  bool                       PSScavenge::_survivor_overflow = false;
  uint                       PSScavenge::_tenuring_threshold = 0;
  HeapWord*                  PSScavenge::_young_generation_boundary = NULL;
+ uintptr_t                  PSScavenge::_young_generation_boundary_compressed = 0;
  elapsedTimer               PSScavenge::_accumulated_time;
  Stack<markOop, mtGC>       PSScavenge::_preserved_mark_stack;
  Stack<oop, mtGC>           PSScavenge::_preserved_oop_stack;
  CollectorCounters*         PSScavenge::_counters = NULL;
  bool                       PSScavenge::_promotion_failed = false;
  
  // Define before use
  class PSIsAliveClosure: public BoolObjectClosure {
  public:
    bool do_object_b(oop p) {
-     return (!PSScavenge::is_obj_in_young((HeapWord*) p)) || p->is_forwarded();
    }
  };
  
  PSIsAliveClosure PSScavenge::_is_alive_closure;
  

*** 813,823 ****
--- 814,824 ----
    PSOldGen* old_gen = heap->old_gen();
  
    // Set boundary between young_gen and old_gen
    assert(old_gen->reserved().end() <= young_gen->eden_space()->bottom(),
           "old above young");
!   _young_generation_boundary = young_gen->eden_space()->bottom();
!   set_young_generation_boundary(young_gen->eden_space()->bottom());
  
    // Initialize ref handling object for scavenging.
    MemRegion mr = young_gen->reserved();
  
    _ref_processor =