src/share/vm/gc/cms/parNewGeneration.hpp

rev 8612 : 8086056: ParNew: auto-tune ParGCCardsPerStrideChunk
Summary: Automatically calculate ParGCCardsPerStrideChunk based on the old gen capacity.
Reviewed-by:
rev 8613 : imported patch TonyCMSChunksAuto2

*** 344,360 ****
    // word being overwritten with a self-forwarding-pointer.
    void preserve_mark_if_necessary(oop obj, markOop m);
  
    void handle_promotion_failed(GenCollectedHeap* gch, ParScanThreadStateSet& thread_state_set);
  
-  protected:
- 
    bool _survivor_overflow;
  
    bool survivor_overflow() { return _survivor_overflow; }
    void set_survivor_overflow(bool v) { _survivor_overflow = v; }
  
   public:
    ParNewGeneration(ReservedSpace rs, size_t initial_byte_size);
  
    ~ParNewGeneration() {
      for (uint i = 0; i < ParallelGCThreads; i++)
--- 344,362 ----
    // word being overwritten with a self-forwarding-pointer.
    void preserve_mark_if_necessary(oop obj, markOop m);
  
    void handle_promotion_failed(GenCollectedHeap* gch, ParScanThreadStateSet& thread_state_set);
  
    bool _survivor_overflow;
  
    bool survivor_overflow() { return _survivor_overflow; }
    void set_survivor_overflow(bool v) { _survivor_overflow = v; }
  
+   // automatically calculate ParGCCardsPerStrideChunk based on the old
+   // gen capacity before each young GC
+   void adjust_cards_per_stride(const Generation& old_gen);
+ 
   public:
    ParNewGeneration(ReservedSpace rs, size_t initial_byte_size);
  
    ~ParNewGeneration() {
      for (uint i = 0; i < ParallelGCThreads; i++)