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

rev 8461 : 8086056: ParNew: auto-tune ParGCCardsPerStrideChunk
Summary: Automatically calculate ParGCCardsPerStrideChunk based on the old gen capacity.
Reviewed-by:
rev 8409 : 8080879: Remove FlexibleWorkGang::set_for_termination
Reviewed-by: brutisso, kbarrett, pliden
rev 8396 : 8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
Reviewed-by: jmasa, kbarrett
rev 8362 : 8079792: GC directory structure cleanup
Reviewed-by: brutisso, stefank, david

*** 343,359 ****
    // 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, int level);
  
    ~ParNewGeneration() {
      for (uint i = 0; i < ParallelGCThreads; i++)
--- 343,365 ----
    // 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; }
  
+   // true -> should automatically calculate ParGCCardsPerStrideChunk
+   // before each young GC
+   bool _should_adjust_cards_per_stride;
+ 
+   // 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, int level);
  
    ~ParNewGeneration() {
      for (uint i = 0; i < ParallelGCThreads; i++)