src/hotspot/share/gc/g1/g1SurvRateGroup.hpp

rev 57051 : imported patch 8233588-cleanup-survrategroup
rev 57055 : imported patch 8234574-analytics-renaming
rev 57057 : imported patch 8234586-rename-survrategroup-files
rev 57058 : imported patch 8234587-rename-g1survrategroup

*** 26,51 ****
  #define SHARE_GC_G1_G1SURVRATEGROUP_HPP
  
  #include "gc/g1/g1Predictions.hpp"
  #include "utilities/numberSeq.hpp"
  
! class SurvRateGroup : public CHeapObj<mtGC> {
    size_t  _stats_arrays_length;
    double* _accum_surv_rate_pred;
    double  _last_pred;
    TruncatedSeq** _surv_rate_predictors;
  
!   size_t _num_added_regions;   // The number of regions in this SurvRateGroup
  
    void fill_in_last_surv_rates();
    void finalize_predictions(const G1Predictions& predictor);
  
  public:
    static const int InvalidAgeIndex = -1;
    static bool is_valid_age_index(int age) { return age >= 0; }
  
!   SurvRateGroup();
    void reset();
    void start_adding_regions();
    void stop_adding_regions();
    void record_surviving_words(int age_in_group, size_t surv_words);
    void all_surviving_words_recorded(const G1Predictions& predictor, bool update_predictors);
--- 26,71 ----
  #define SHARE_GC_G1_G1SURVRATEGROUP_HPP
  
  #include "gc/g1/g1Predictions.hpp"
  #include "utilities/numberSeq.hpp"
  
! // A survivor rate group tracks survival ratios of objects allocated in the
! // heap regions associated to a set of regions (a "space", i.e. eden or survivor)
! // on a time basis to predict future survival rates of regions of the same "age".
! //
! // Every time a new heap region associated with a survivor rate group is retired
! // (i.e. the time basis), it gets associated the next "age" entry in that group.
! //
! // During garbage collection G1 keeps track how much of total data is copied out
! // of a heap region (i.e. survives), to update the survivor rate predictor of that age.
! //
! // This information is used to predict, given a particular age of a heap region,
! // how much of its contents will likely survive to determine young generation sizes.
! //
! // The age index associated with a heap region is incremented from 0 (retired first)
! // to N (retired just before the GC).
! //
! // To avoid copying around data all the time when the total amount of regions in
! // a survivor rate group changes, this class organizes the arrays containing the
! // predictors in reverse chronological order as returned by age_in_group(). I.e.
! // index 0 contains the rate information for the region retired most recently.
! class G1SurvRateGroup : public CHeapObj<mtGC> {
    size_t  _stats_arrays_length;
    double* _accum_surv_rate_pred;
    double  _last_pred;
    TruncatedSeq** _surv_rate_predictors;
  
!   size_t _num_added_regions;   // The number of regions in this survivor rate group.
  
    void fill_in_last_surv_rates();
    void finalize_predictions(const G1Predictions& predictor);
  
  public:
    static const int InvalidAgeIndex = -1;
    static bool is_valid_age_index(int age) { return age >= 0; }
  
!   G1SurvRateGroup();
    void reset();
    void start_adding_regions();
    void stop_adding_regions();
    void record_surviving_words(int age_in_group, size_t surv_words);
    void all_surviving_words_recorded(const G1Predictions& predictor, bool update_predictors);