--- a/hotspot/src/share/vm/gc_implementation/parNew/parNewGeneration.hpp	Tue Sep 28 09:51:37 2010 -0700
+++ b/hotspot/src/share/vm/gc_implementation/parNew/parNewGeneration.hpp	Tue Sep 28 15:56:15 2010 -0700
@@ -52,7 +52,7 @@
   friend class ParScanThreadStateSet;
  private:
   ObjToScanQueue *_work_queue;
-  GrowableArray<oop>* _overflow_stack;
+  Stack<oop>* const _overflow_stack;
 
   ParGCAllocBuffer _to_space_alloc_buffer;
 
@@ -120,7 +120,7 @@
   ParScanThreadState(Space* to_space_, ParNewGeneration* gen_,
                      Generation* old_gen_, int thread_num_,
                      ObjToScanQueueSet* work_queue_set_,
-                     GrowableArray<oop>** overflow_stack_set_,
+                     Stack<oop>* overflow_stacks_,
                      size_t desired_plab_sz_,
                      ParallelTaskTerminator& term_);
 
@@ -144,7 +144,7 @@
   void trim_queues(int max_size);
 
   // Private overflow stack usage
-  GrowableArray<oop>* overflow_stack() { return _overflow_stack; }
+  Stack<oop>* overflow_stack() { return _overflow_stack; }
   bool take_from_overflow_stack();
   void push_on_overflow_stack(oop p);
 
@@ -301,7 +301,7 @@
   ObjToScanQueueSet* _task_queues;
 
   // Per-worker-thread local overflow stacks
-  GrowableArray<oop>** _overflow_stacks;
+  Stack<oop>* _overflow_stacks;
 
   // Desired size of survivor space plab's
   PLABStats _plab_stats;