--- a/src/hotspot/share/gc/g1/g1Analytics.hpp Fri Nov 29 11:28:39 2019 +0300
+++ b/src/hotspot/share/gc/g1/g1Analytics.hpp Fri Nov 29 10:20:14 2019 +0100
@@ -48,13 +48,21 @@
TruncatedSeq* _rs_length_diff_seq;
TruncatedSeq* _concurrent_refine_rate_ms_seq;
TruncatedSeq* _logged_cards_rate_ms_seq;
- TruncatedSeq* _cost_per_logged_card_ms_seq;
- TruncatedSeq* _cost_scan_hcc_seq;
- TruncatedSeq* _young_cards_per_entry_ratio_seq;
- TruncatedSeq* _mixed_cards_per_entry_ratio_seq;
- TruncatedSeq* _young_only_cost_per_remset_card_ms_seq;
- TruncatedSeq* _mixed_cost_per_remset_card_ms_seq;
- TruncatedSeq* _cost_per_byte_ms_seq;
+ // The ratio between the number of merged cards and actually scanned cards, for
+ // young-only and mixed gcs.
+ TruncatedSeq* _young_card_merge_to_scan_ratio_seq;
+ TruncatedSeq* _mixed_card_merge_to_scan_ratio_seq;
+
+ // The cost to scan a card during young-only and mixed gcs in ms.
+ TruncatedSeq* _young_cost_per_card_scan_ms_seq;
+ TruncatedSeq* _mixed_cost_per_card_scan_ms_seq;
+
+ // The cost to merge a card during young-only and mixed gcs in ms.
+ TruncatedSeq* _young_cost_per_card_merge_ms_seq;
+ TruncatedSeq* _mixed_cost_per_card_merge_ms_seq;
+
+ // The cost to copy a byte in ms.
+ TruncatedSeq* _copy_cost_per_byte_ms_seq;
TruncatedSeq* _constant_other_time_ms_seq;
TruncatedSeq* _young_other_cost_per_region_ms_seq;
TruncatedSeq* _non_young_other_cost_per_region_ms_seq;
@@ -72,6 +80,10 @@
double _recent_avg_pause_time_ratio;
double _last_pause_time_ratio;
+ // Returns whether the sequence have enough samples to get a "good" prediction.
+ // The constant used is random but "small".
+ bool enough_samples_available(TruncatedSeq const* seq) const;
+
double get_new_prediction(TruncatedSeq const* seq) const;
size_t get_new_size_prediction(TruncatedSeq const* seq) const;
@@ -103,10 +115,9 @@
void report_alloc_rate_ms(double alloc_rate);
void report_concurrent_refine_rate_ms(double cards_per_ms);
void report_logged_cards_rate_ms(double cards_per_ms);
- void report_cost_per_logged_card_ms(double cost_per_logged_card_ms);
- void report_cost_scan_hcc(double cost_scan_hcc);
- void report_cost_per_remset_card_ms(double cost_per_remset_card_ms, bool for_young_gc);
- void report_cards_per_entry_ratio(double cards_per_entry_ratio, bool for_young_gc);
+ void report_cost_per_card_scan_ms(double cost_per_remset_card_ms, bool for_young_gc);
+ void report_cost_per_card_merge_ms(double cost_per_card_ms, bool for_young_gc);
+ void report_card_merge_to_scan_ratio(double cards_per_entry_ratio, bool for_young_gc);
void report_rs_length_diff(double rs_length_diff);
void report_cost_per_byte_ms(double cost_per_byte_ms, bool mark_or_rebuild_in_progress);
void report_young_other_cost_per_region_ms(double other_cost_per_region_ms);
@@ -120,21 +131,14 @@
double predict_concurrent_refine_rate_ms() const;
double predict_logged_cards_rate_ms() const;
- double predict_cost_per_logged_card_ms() const;
-
- double predict_scan_hcc_ms() const;
+ double predict_young_card_merge_to_scan_ratio() const;
- double predict_rs_update_time_ms(size_t pending_cards) const;
-
- double predict_young_cards_per_entry_ratio() const;
+ double predict_mixed_card_merge_to_scan_ratio() const;
- double predict_mixed_cards_per_entry_ratio() const;
-
- size_t predict_card_num(size_t rs_length, bool for_young_gc) const;
+ size_t predict_scan_card_num(size_t rs_length, bool for_young_gc) const;
- double predict_rs_scan_time_ms(size_t card_num, bool for_young_gc) const;
-
- double predict_mixed_rs_scan_time_ms(size_t card_num) const;
+ double predict_card_merge_time_ms(size_t card_num, bool for_young_gc) const;
+ double predict_card_scan_time_ms(size_t card_num, bool for_young_gc) const;
double predict_object_copy_time_ms_during_cm(size_t bytes_to_copy) const;
@@ -153,8 +157,6 @@
size_t predict_rs_length() const;
size_t predict_pending_cards() const;
- double predict_cost_per_byte_ms() const;
-
// Add a new GC of the given duration and end time to the record.
void update_recent_gc_times(double end_time_sec, double elapsed_ms);
void compute_pause_time_ratio(double interval_ms, double pause_time_ms);