28 #include "memory/allocation.hpp"
  29 
  30 class G1Analytics;
  31 class G1CollectedHeap;
  32 
  33 class G1HeapSizingPolicy: public CHeapObj<mtGC> {
  34   // MinOverThresholdForGrowth must be less than the number of recorded
  35   // pause times in G1Analytics, representing the minimum number of pause
  36   // time ratios that exceed GCTimeRatio before a heap expansion will be triggered.
  37   const static uint MinOverThresholdForGrowth = 4;
  38 
  39   const G1CollectedHeap* _g1h;
  40   const G1Analytics* _analytics;
  41 
  42   const uint _num_prev_pauses_for_heuristics;
  43   // Ratio check data for determining if heap growth is necessary.
  44   uint _ratio_over_threshold_count;
  45   double _ratio_over_threshold_sum;
  46   uint _pauses_since_start;
  47 



  48 
  49 protected:
  50   G1HeapSizingPolicy(const G1CollectedHeap* g1h, const G1Analytics* analytics);
  51 public:
  52 
  53   // If an expansion would be appropriate, because recent GC overhead had
  54   // exceeded the desired limit, return an amount to expand by.
  55   virtual size_t expansion_amount();


  56 
  57   // Clear ratio tracking data used by expansion_amount().
  58   void clear_ratio_check_data();
  59 
  60   static G1HeapSizingPolicy* create(const G1CollectedHeap* g1h, const G1Analytics* analytics);
  61 };
  62 
  63 #endif // SHARE_GC_G1_G1HEAPSIZINGPOLICY_HPP

  28 #include "memory/allocation.hpp"
  29 
  30 class G1Analytics;
  31 class G1CollectedHeap;
  32 
  33 class G1HeapSizingPolicy: public CHeapObj<mtGC> {
  34   // MinOverThresholdForGrowth must be less than the number of recorded
  35   // pause times in G1Analytics, representing the minimum number of pause
  36   // time ratios that exceed GCTimeRatio before a heap expansion will be triggered.
  37   const static uint MinOverThresholdForGrowth = 4;
  38 
  39   const G1CollectedHeap* _g1h;
  40   const G1Analytics* _analytics;
  41 
  42   const uint _num_prev_pauses_for_heuristics;
  43   // Ratio check data for determining if heap growth is necessary.
  44   uint _ratio_over_threshold_count;
  45   double _ratio_over_threshold_sum;
  46   uint _pauses_since_start;
  47 
  48   // Mininum heap capacity after last concurrent mark
  49   size_t _minimum_desired_bytes_after_last_cm;
  50 
  51 
  52 protected:
  53   G1HeapSizingPolicy(const G1CollectedHeap* g1h, const G1Analytics* analytics);
  54 public:
  55 
  56   // If an expansion would be appropriate, because recent GC overhead had
  57   // exceeded the desired limit, return an amount to expand by.
  58   virtual size_t expansion_amount_after_young_collection();
  59   virtual size_t expansion_amount_after_concurrent_mark();
  60   virtual size_t shrink_amount_after_mixed_collections();
  61 
  62   // Clear ratio tracking data used by expansion_amount().
  63   void clear_ratio_check_data();
  64 
  65   static G1HeapSizingPolicy* create(const G1CollectedHeap* g1h, const G1Analytics* analytics);
  66 };
  67 
  68 #endif // SHARE_GC_G1_G1HEAPSIZINGPOLICY_HPP