src/share/vm/gc_implementation/shenandoah/shenandoahPacer.hpp

rev 10543 : [backport] Application pacing precision fixes
rev 10566 : [backport] Pacer should account actual size for elastic TLABs
rev 10598 : [backport] Shenandoah changes to allow enabling -Wreorder

*** 27,36 ****
--- 27,39 ----
  #include "memory/allocation.hpp"
  #include "utilities/numberSeq.hpp"
  
  class ShenandoahHeap;
  
+ #define PACING_PROGRESS_UNINIT (-1)
+ #define PACING_PROGRESS_ZERO   ( 0)
+ 
  /**
   * ShenandoahPacer provides allocation pacing mechanism.
   *
   * Currently it implements simple tax-and-spend pacing policy: GC threads provide
   * credit, allocating thread spend the credit, or stall when credit is not available.
*** 40,52 ****
    ShenandoahHeap* _heap;
    volatile intptr_t _budget;
    volatile jdouble _tax_rate;
    BinaryMagnitudeSeq _delays;
  
  public:
    ShenandoahPacer(ShenandoahHeap* heap) :
!           _heap(heap), _budget(0), _tax_rate(1) {}
  
    void setup_for_idle();
    void setup_for_mark();
    void setup_for_evac();
    void setup_for_updaterefs();
--- 43,63 ----
    ShenandoahHeap* _heap;
    volatile intptr_t _budget;
    volatile jdouble _tax_rate;
    BinaryMagnitudeSeq _delays;
  
+   volatile intptr_t _progress;
+   TruncatedSeq* _progress_history;
+   volatile intptr_t _epoch;
+ 
  public:
    ShenandoahPacer(ShenandoahHeap* heap) :
!           _heap(heap), _budget(0), _tax_rate(1),
!           _progress(PACING_PROGRESS_UNINIT),
!           _progress_history(new TruncatedSeq(5)),
!           _epoch(0) {
!   }
  
    void setup_for_idle();
    void setup_for_mark();
    void setup_for_evac();
    void setup_for_updaterefs();
*** 57,70 ****
--- 68,88 ----
  
    inline void report_alloc(size_t words);
  
    bool claim_for_alloc(size_t words, bool force);
    void pace_for_alloc(size_t words);
+   void unpace_for_alloc(intptr_t epoch, size_t words);
+ 
+   intptr_t epoch();
  
    void print_on(outputStream* out) const;
  
  private:
    inline void report_internal(size_t words);
+   inline void report_progress_internal(size_t words);
+ 
    void restart_with(jlong non_taxable_bytes, jdouble tax_rate);
+ 
+   size_t update_and_get_progress_history();
  };
  
  #endif //SHARE_VM_GC_SHENANDOAH_SHENANDOAHPACER_HPP