342N/A

342N/A

342N/Aclass HeapRegion;

342N/Aclass CollectionSetChooser;

342N/A

342N/A

342N/A#define define_num_seq(name) \

342N/Aprivate: \

342N/A NumberSeq _all_##name##_times_ms; \

342N/Apublic: \

342N/A void record_##name##_time_ms(double ms) { \

342N/A _all_##name##_times_ms.add(ms); \

342N/A } \

342N/A NumberSeq* get_##name##_seq() { \

342N/A return &_all_##name##_times_ms; \

342N/A }

342N/A

342N/Aclass MainBodySummary;

342N/Aclass PopPreambleSummary;

342N/A

342N/Aclass PauseSummary {

342N/A define_num_seq(total)

342N/A define_num_seq(other)

342N/A

342N/Apublic:

342N/A virtual MainBodySummary* main_body_summary() { return NULL; }

342N/A virtual PopPreambleSummary* pop_preamble_summary() { return NULL; }

342N/A};

342N/A

342N/Aclass MainBodySummary {

342N/A define_num_seq(satb_drain) // optional

342N/A define_num_seq(parallel) // parallel only

342N/A define_num_seq(ext_root_scan)

342N/A define_num_seq(mark_stack_scan)

342N/A define_num_seq(scan_only)

342N/A define_num_seq(update_rs)

342N/A define_num_seq(scan_rs)

342N/A define_num_seq(scan_new_refs) // Only for temp use; added to

342N/A // in parallel case.

342N/A define_num_seq(obj_copy)

342N/A define_num_seq(termination) // parallel only

342N/A define_num_seq(parallel_other) // parallel only

342N/A define_num_seq(mark_closure)

342N/A define_num_seq(clear_ct) // parallel only

342N/A};

342N/A

342N/Aclass PopPreambleSummary {

342N/A define_num_seq(pop_preamble)

342N/A define_num_seq(pop_update_rs)

342N/A define_num_seq(pop_scan_rs)

342N/A define_num_seq(pop_closure_app)

342N/A define_num_seq(pop_evacuation)

342N/A define_num_seq(pop_other)

342N/A};

342N/A

342N/Aclass NonPopSummary: public PauseSummary,

342N/A public MainBodySummary {

342N/Apublic:

342N/A virtual MainBodySummary* main_body_summary() { return this; }

342N/A};

342N/A

342N/Aclass PopSummary: public PauseSummary,

342N/A public MainBodySummary,

342N/A public PopPreambleSummary {

342N/Apublic:

342N/A virtual MainBodySummary* main_body_summary() { return this; }

342N/A virtual PopPreambleSummary* pop_preamble_summary() { return this; }

342N/A};

342N/A

342N/Aclass NonPopAbandonedSummary: public PauseSummary {

342N/A};

342N/A

342N/Aclass PopAbandonedSummary: public PauseSummary,

342N/A public PopPreambleSummary {

342N/Apublic:

342N/A virtual PopPreambleSummary* pop_preamble_summary() { return this; }

342N/A};

342N/A

342N/Aclass G1CollectorPolicy: public CollectorPolicy {

342N/Aprotected:

342N/A // The number of pauses during the execution.

342N/A long _n_pauses;

342N/A

342N/A // either equal to the number of parallel threads, if ParallelGCThreads

342N/A // has been set, or 1 otherwise

342N/A int _parallel_gc_threads;

342N/A

342N/A enum SomePrivateConstants {

342N/A NumPrevPausesForHeuristics = 10,

342N/A NumPrevGCsForHeuristics = 10,

342N/A NumAPIs = HeapRegion::MaxAge

342N/A };

342N/A

342N/A G1MMUTracker* _mmu_tracker;

342N/A

342N/A void initialize_flags();

342N/A

342N/A void initialize_all() {

342N/A initialize_flags();

342N/A initialize_size_info();

342N/A initialize_perm_generation(PermGen::MarkSweepCompact);

342N/A }

342N/A

342N/A virtual size_t default_init_heap_size() {

342N/A // Pick some reasonable default.

342N/A return 8*M;

342N/A }

342N/A

342N/A

342N/A double _cur_collection_start_sec;

342N/A size_t _cur_collection_pause_used_at_start_bytes;

342N/A size_t _cur_collection_pause_used_regions_at_start;

342N/A size_t _prev_collection_pause_used_at_end_bytes;

342N/A double _cur_collection_par_time_ms;

342N/A double _cur_satb_drain_time_ms;

342N/A double _cur_clear_ct_time_ms;

342N/A bool _satb_drain_time_set;

342N/A double _cur_popular_preamble_start_ms;

342N/A double _cur_popular_preamble_time_ms;

342N/A double _cur_popular_compute_rc_time_ms;

342N/A double _cur_popular_evac_time_ms;

342N/A

342N/A double _cur_CH_strong_roots_end_sec;

342N/A double _cur_CH_strong_roots_dur_ms;

342N/A double _cur_G1_strong_roots_end_sec;

342N/A double _cur_G1_strong_roots_dur_ms;

342N/A

342N/A // Statistics for recent GC pauses. See below for how indexed.

342N/A TruncatedSeq* _recent_CH_strong_roots_times_ms;

342N/A TruncatedSeq* _recent_G1_strong_roots_times_ms;

342N/A TruncatedSeq* _recent_evac_times_ms;

342N/A // These exclude marking times.

342N/A TruncatedSeq* _recent_pause_times_ms;

342N/A TruncatedSeq* _recent_gc_times_ms;

342N/A

342N/A TruncatedSeq* _recent_CS_bytes_used_before;

342N/A TruncatedSeq* _recent_CS_bytes_surviving;

342N/A

342N/A TruncatedSeq* _recent_rs_sizes;

342N/A

342N/A TruncatedSeq* _concurrent_mark_init_times_ms;

342N/A TruncatedSeq* _concurrent_mark_remark_times_ms;

342N/A TruncatedSeq* _concurrent_mark_cleanup_times_ms;

342N/A

342N/A NonPopSummary* _non_pop_summary;

342N/A PopSummary* _pop_summary;

342N/A NonPopAbandonedSummary* _non_pop_abandoned_summary;

342N/A PopAbandonedSummary* _pop_abandoned_summary;

342N/A

342N/A NumberSeq* _all_pause_times_ms;

342N/A NumberSeq* _all_full_gc_times_ms;

342N/A double _stop_world_start;

342N/A NumberSeq* _all_stop_world_times_ms;

342N/A NumberSeq* _all_yield_times_ms;

342N/A

342N/A size_t _region_num_young;

342N/A size_t _region_num_tenured;

342N/A size_t _prev_region_num_young;

342N/A size_t _prev_region_num_tenured;

342N/A

342N/A NumberSeq* _all_mod_union_times_ms;

342N/A

342N/A int _aux_num;

342N/A NumberSeq* _all_aux_times_ms;

342N/A double* _cur_aux_start_times_ms;

342N/A double* _cur_aux_times_ms;

342N/A bool* _cur_aux_times_set;

342N/A

342N/A double* _par_last_ext_root_scan_times_ms;

342N/A double* _par_last_mark_stack_scan_times_ms;

342N/A double* _par_last_scan_only_times_ms;

342N/A double* _par_last_scan_only_regions_scanned;

342N/A double* _par_last_update_rs_start_times_ms;

342N/A double* _par_last_update_rs_times_ms;

342N/A double* _par_last_update_rs_processed_buffers;

342N/A double* _par_last_scan_rs_start_times_ms;

342N/A double* _par_last_scan_rs_times_ms;

342N/A double* _par_last_scan_new_refs_times_ms;

342N/A double* _par_last_obj_copy_times_ms;

342N/A double* _par_last_termination_times_ms;

342N/A

342N/A // there are two pases during popular pauses, so we need to store

342N/A // somewhere the results of the first pass

342N/A double* _pop_par_last_update_rs_start_times_ms;

342N/A double* _pop_par_last_update_rs_times_ms;

342N/A double* _pop_par_last_update_rs_processed_buffers;

342N/A double* _pop_par_last_scan_rs_start_times_ms;

342N/A double* _pop_par_last_scan_rs_times_ms;

342N/A double* _pop_par_last_closure_app_times_ms;

342N/A

342N/A double _pop_compute_rc_start;

342N/A double _pop_evac_start;

342N/A

342N/A // indicates that we are in young GC mode

342N/A bool _in_young_gc_mode;

342N/A

342N/A // indicates whether we are in full young or partially young GC mode

342N/A bool _full_young_gcs;

342N/A

342N/A // if true, then it tries to dynamically adjust the length of the

342N/A // young list

342N/A bool _adaptive_young_list_length;

342N/A size_t _young_list_min_length;

342N/A size_t _young_list_target_length;

342N/A size_t _young_list_so_prefix_length;

342N/A size_t _young_list_fixed_length;

342N/A

342N/A size_t _young_cset_length;

342N/A bool _last_young_gc_full;

342N/A

342N/A double _target_pause_time_ms;

342N/A

342N/A unsigned _full_young_pause_num;

342N/A unsigned _partial_young_pause_num;

342N/A

342N/A bool _during_marking;

342N/A bool _in_marking_window;

342N/A bool _in_marking_window_im;

342N/A

342N/A SurvRateGroup* _short_lived_surv_rate_group;

342N/A SurvRateGroup* _survivor_surv_rate_group;

342N/A // add here any more surv rate groups

342N/A

342N/A bool during_marking() {

342N/A return _during_marking;

342N/A }

342N/A

342N/A // <NEW PREDICTION>

342N/A

342N/Aprivate:

342N/A enum PredictionConstants {

342N/A TruncatedSeqLength = 10

342N/A };

342N/A

342N/A TruncatedSeq* _alloc_rate_ms_seq;

342N/A double _prev_collection_pause_end_ms;

342N/A

342N/A TruncatedSeq* _pending_card_diff_seq;

342N/A TruncatedSeq* _rs_length_diff_seq;

342N/A TruncatedSeq* _cost_per_card_ms_seq;

342N/A TruncatedSeq* _cost_per_scan_only_region_ms_seq;

342N/A TruncatedSeq* _fully_young_cards_per_entry_ratio_seq;

342N/A TruncatedSeq* _partially_young_cards_per_entry_ratio_seq;

342N/A TruncatedSeq* _cost_per_entry_ms_seq;

342N/A TruncatedSeq* _partially_young_cost_per_entry_ms_seq;

342N/A TruncatedSeq* _cost_per_byte_ms_seq;

342N/A TruncatedSeq* _constant_other_time_ms_seq;

342N/A TruncatedSeq* _young_other_cost_per_region_ms_seq;

342N/A TruncatedSeq* _non_young_other_cost_per_region_ms_seq;

342N/A

342N/A TruncatedSeq* _pending_cards_seq;

342N/A TruncatedSeq* _scanned_cards_seq;

342N/A TruncatedSeq* _rs_lengths_seq;

342N/A

342N/A TruncatedSeq* _cost_per_byte_ms_during_cm_seq;

342N/A TruncatedSeq* _cost_per_scan_only_region_ms_during_cm_seq;

342N/A

342N/A TruncatedSeq* _young_gc_eff_seq;

342N/A

342N/A TruncatedSeq* _max_conc_overhead_seq;

342N/A

342N/A size_t _recorded_young_regions;

342N/A size_t _recorded_scan_only_regions;

342N/A size_t _recorded_non_young_regions;

342N/A size_t _recorded_region_num;

342N/A

342N/A size_t _free_regions_at_end_of_collection;

342N/A size_t _scan_only_regions_at_end_of_collection;

342N/A

342N/A size_t _recorded_rs_lengths;

342N/A size_t _max_rs_lengths;

342N/A

342N/A size_t _recorded_marked_bytes;

342N/A size_t _recorded_young_bytes;

342N/A

342N/A size_t _predicted_pending_cards;

342N/A size_t _predicted_cards_scanned;

342N/A size_t _predicted_rs_lengths;

342N/A size_t _predicted_bytes_to_copy;

342N/A

342N/A double _predicted_survival_ratio;

342N/A double _predicted_rs_update_time_ms;

342N/A double _predicted_rs_scan_time_ms;

342N/A double _predicted_scan_only_scan_time_ms;

342N/A double _predicted_object_copy_time_ms;

342N/A double _predicted_constant_other_time_ms;

342N/A double _predicted_young_other_time_ms;

342N/A double _predicted_non_young_other_time_ms;

342N/A double _predicted_pause_time_ms;

342N/A

342N/A double _vtime_diff_ms;

342N/A

342N/A double _recorded_young_free_cset_time_ms;

342N/A double _recorded_non_young_free_cset_time_ms;

342N/A

342N/A double _sigma;

342N/A double _expensive_region_limit_ms;

342N/A

342N/A size_t _rs_lengths_prediction;

342N/A

342N/A size_t _known_garbage_bytes;

342N/A double _known_garbage_ratio;

342N/A

342N/A double sigma() {

342N/A return _sigma;

342N/A }

342N/A

342N/A // A function that prevents us putting too much stock in small sample

342N/A // sets. Returns a number between 2.0 and 1.0, depending on the number

342N/A // of samples. 5 or more samples yields one; fewer scales linearly from

342N/A // 2.0 at 1 sample to 1.0 at 5.

342N/A double confidence_factor(int samples) {

342N/A if (samples > 4) return 1.0;

342N/A else return 1.0 + sigma() * ((double)(5 - samples))/2.0;

342N/A }

342N/A

342N/A double get_new_neg_prediction(TruncatedSeq* seq) {

342N/A return seq->davg() - sigma() * seq->dsd();

342N/A }

342N/A

342N/A#ifndef PRODUCT

342N/A bool verify_young_ages(HeapRegion* head, SurvRateGroup *surv_rate_group);

342N/A#endif // PRODUCT

342N/A

342N/Aprotected:

342N/A double _pause_time_target_ms;

342N/A double _recorded_young_cset_choice_time_ms;

342N/A double _recorded_non_young_cset_choice_time_ms;

342N/A bool _within_target;

342N/A size_t _pending_cards;

342N/A size_t _max_pending_cards;

342N/A

342N/Apublic:

342N/A

342N/A void set_region_short_lived(HeapRegion* hr) {

342N/A hr->install_surv_rate_group(_short_lived_surv_rate_group);

342N/A }

342N/A

342N/A void set_region_survivors(HeapRegion* hr) {

342N/A hr->install_surv_rate_group(_survivor_surv_rate_group);

342N/A }

342N/A

342N/A#ifndef PRODUCT

342N/A bool verify_young_ages();

342N/A#endif // PRODUCT

342N/A

342N/A void tag_scan_only(size_t short_lived_scan_only_length);

342N/A

342N/A double get_new_prediction(TruncatedSeq* seq) {

342N/A return MAX2(seq->davg() + sigma() * seq->dsd(),

342N/A seq->davg() * confidence_factor(seq->num()));

342N/A }

342N/A

342N/A size_t young_cset_length() {

342N/A return _young_cset_length;

342N/A }

342N/A

342N/A void record_max_rs_lengths(size_t rs_lengths) {

342N/A _max_rs_lengths = rs_lengths;

342N/A }

342N/A

342N/A size_t predict_pending_card_diff() {

342N/A double prediction = get_new_neg_prediction(_pending_card_diff_seq);

342N/A if (prediction < 0.00001)

342N/A return 0;

342N/A else

342N/A return (size_t) prediction;

342N/A }

342N/A

342N/A size_t predict_pending_cards() {

342N/A size_t max_pending_card_num = _g1->max_pending_card_num();

342N/A size_t diff = predict_pending_card_diff();

342N/A size_t prediction;

342N/A if (diff > max_pending_card_num)

342N/A prediction = max_pending_card_num;

342N/A else

342N/A prediction = max_pending_card_num - diff;

342N/A

342N/A return prediction;

342N/A }

342N/A

342N/A size_t predict_rs_length_diff() {

342N/A return (size_t) get_new_prediction(_rs_length_diff_seq);

342N/A }

342N/A

342N/A double predict_alloc_rate_ms() {

342N/A return get_new_prediction(_alloc_rate_ms_seq);

342N/A }

342N/A

342N/A double predict_cost_per_card_ms() {

342N/A return get_new_prediction(_cost_per_card_ms_seq);

342N/A }

342N/A

342N/A double predict_rs_update_time_ms(size_t pending_cards) {

342N/A return (double) pending_cards * predict_cost_per_card_ms();

342N/A }

342N/A

342N/A double predict_fully_young_cards_per_entry_ratio() {

342N/A return get_new_prediction(_fully_young_cards_per_entry_ratio_seq);

342N/A }

342N/A

342N/A double predict_partially_young_cards_per_entry_ratio() {

342N/A if (_partially_young_cards_per_entry_ratio_seq->num() < 2)

342N/A return predict_fully_young_cards_per_entry_ratio();

342N/A else

342N/A return get_new_prediction(_partially_young_cards_per_entry_ratio_seq);

342N/A }

342N/A

342N/A size_t predict_young_card_num(size_t rs_length) {

342N/A return (size_t) ((double) rs_length *

342N/A predict_fully_young_cards_per_entry_ratio());

342N/A }

342N/A

342N/A size_t predict_non_young_card_num(size_t rs_length) {

342N/A return (size_t) ((double) rs_length *

342N/A predict_partially_young_cards_per_entry_ratio());

342N/A }

342N/A

342N/A double predict_rs_scan_time_ms(size_t card_num) {

342N/A if (full_young_gcs())

342N/A return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq);

342N/A else

342N/A return predict_partially_young_rs_scan_time_ms(card_num);

342N/A }

342N/A

342N/A double predict_partially_young_rs_scan_time_ms(size_t card_num) {

342N/A if (_partially_young_cost_per_entry_ms_seq->num() < 3)

342N/A return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq);

342N/A else

342N/A return (double) card_num *

342N/A get_new_prediction(_partially_young_cost_per_entry_ms_seq);

342N/A }

342N/A

342N/A double predict_scan_only_time_ms_during_cm(size_t scan_only_region_num) {

342N/A if (_cost_per_scan_only_region_ms_during_cm_seq->num() < 3)

342N/A return 1.5 * (double) scan_only_region_num *

342N/A get_new_prediction(_cost_per_scan_only_region_ms_seq);

342N/A else

342N/A return (double) scan_only_region_num *

342N/A get_new_prediction(_cost_per_scan_only_region_ms_during_cm_seq);

342N/A }

342N/A

342N/A double predict_scan_only_time_ms(size_t scan_only_region_num) {

342N/A if (_in_marking_window_im)

342N/A return predict_scan_only_time_ms_during_cm(scan_only_region_num);

342N/A else

342N/A return (double) scan_only_region_num *

342N/A get_new_prediction(_cost_per_scan_only_region_ms_seq);

342N/A }

342N/A

342N/A double predict_object_copy_time_ms_during_cm(size_t bytes_to_copy) {

342N/A if (_cost_per_byte_ms_during_cm_seq->num() < 3)

342N/A return 1.1 * (double) bytes_to_copy *

342N/A get_new_prediction(_cost_per_byte_ms_seq);

342N/A else

342N/A return (double) bytes_to_copy *

342N/A get_new_prediction(_cost_per_byte_ms_during_cm_seq);

342N/A }

342N/A

342N/A double predict_object_copy_time_ms(size_t bytes_to_copy) {

342N/A if (_in_marking_window && !_in_marking_window_im)

342N/A return predict_object_copy_time_ms_during_cm(bytes_to_copy);

342N/A else

342N/A return (double) bytes_to_copy *

342N/A get_new_prediction(_cost_per_byte_ms_seq);

342N/A }

342N/A

342N/A double predict_constant_other_time_ms() {

342N/A return get_new_prediction(_constant_other_time_ms_seq);

342N/A }

342N/A

342N/A double predict_young_other_time_ms(size_t young_num) {

342N/A return

342N/A (double) young_num *

342N/A get_new_prediction(_young_other_cost_per_region_ms_seq);

342N/A }

342N/A

342N/A double predict_non_young_other_time_ms(size_t non_young_num) {

342N/A return

342N/A (double) non_young_num *

342N/A get_new_prediction(_non_young_other_cost_per_region_ms_seq);

342N/A }

342N/A

342N/A void check_if_region_is_too_expensive(double predicted_time_ms);

342N/A

342N/A double predict_young_collection_elapsed_time_ms(size_t adjustment);

342N/A double predict_base_elapsed_time_ms(size_t pending_cards);

342N/A double predict_base_elapsed_time_ms(size_t pending_cards,

342N/A size_t scanned_cards);

342N/A size_t predict_bytes_to_copy(HeapRegion* hr);

342N/A double predict_region_elapsed_time_ms(HeapRegion* hr, bool young);

342N/A

342N/A // for use by: calculate_optimal_so_length(length)

342N/A void predict_gc_eff(size_t young_region_num,

342N/A size_t so_length,

342N/A double base_time_ms,

342N/A double *gc_eff,

342N/A double *pause_time_ms);

342N/A

342N/A // for use by: calculate_young_list_target_config(rs_length)

342N/A bool predict_gc_eff(size_t young_region_num,

342N/A size_t so_length,

342N/A double base_time_with_so_ms,

342N/A size_t init_free_regions,

342N/A double target_pause_time_ms,

342N/A double* gc_eff);

342N/A

342N/A void start_recording_regions();

342N/A void record_cset_region(HeapRegion* hr, bool young);

342N/A void record_scan_only_regions(size_t scan_only_length);

342N/A void end_recording_regions();

342N/A

342N/A void record_vtime_diff_ms(double vtime_diff_ms) {

342N/A _vtime_diff_ms = vtime_diff_ms;

342N/A }

342N/A

342N/A void record_young_free_cset_time_ms(double time_ms) {

342N/A _recorded_young_free_cset_time_ms = time_ms;

342N/A }

342N/A

342N/A void record_non_young_free_cset_time_ms(double time_ms) {

342N/A _recorded_non_young_free_cset_time_ms = time_ms;

342N/A }

342N/A

342N/A double predict_young_gc_eff() {

342N/A return get_new_neg_prediction(_young_gc_eff_seq);

342N/A }

342N/A

545N/A double predict_survivor_regions_evac_time();

545N/A

342N/A // </NEW PREDICTION>

342N/A

342N/Apublic:

342N/A void cset_regions_freed() {

342N/A bool propagate = _last_young_gc_full && !_in_marking_window;

342N/A _short_lived_surv_rate_group->all_surviving_words_recorded(propagate);

342N/A _survivor_surv_rate_group->all_surviving_words_recorded(propagate);

342N/A // also call it on any more surv rate groups

342N/A }

342N/A

342N/A void set_known_garbage_bytes(size_t known_garbage_bytes) {

342N/A _known_garbage_bytes = known_garbage_bytes;

342N/A size_t heap_bytes = _g1->capacity();

342N/A _known_garbage_ratio = (double) _known_garbage_bytes / (double) heap_bytes;

342N/A }

342N/A

342N/A void decrease_known_garbage_bytes(size_t known_garbage_bytes) {

342N/A guarantee( _known_garbage_bytes >= known_garbage_bytes, "invariant" );

342N/A

342N/A _known_garbage_bytes -= known_garbage_bytes;

342N/A size_t heap_bytes = _g1->capacity();

342N/A _known_garbage_ratio = (double) _known_garbage_bytes / (double) heap_bytes;

342N/A }

342N/A

342N/A G1MMUTracker* mmu_tracker() {

342N/A return _mmu_tracker;

342N/A }

342N/A

342N/A double predict_init_time_ms() {

342N/A return get_new_prediction(_concurrent_mark_init_times_ms);

342N/A }

342N/A

342N/A double predict_remark_time_ms() {

342N/A return get_new_prediction(_concurrent_mark_remark_times_ms);

342N/A }

342N/A

342N/A double predict_cleanup_time_ms() {

342N/A return get_new_prediction(_concurrent_mark_cleanup_times_ms);

342N/A }

342N/A

342N/A // Returns an estimate of the survival rate of the region at yg-age

342N/A // "yg_age".

545N/A double predict_yg_surv_rate(int age, SurvRateGroup* surv_rate_group) {

545N/A TruncatedSeq* seq = surv_rate_group->get_seq(age);

342N/A if (seq->num() == 0)

342N/A gclog_or_tty->print("BARF! age is %d", age);

342N/A guarantee( seq->num() > 0, "invariant" );

342N/A double pred = get_new_prediction(seq);

342N/A if (pred > 1.0)

342N/A pred = 1.0;

342N/A return pred;

342N/A }

342N/A

545N/A double predict_yg_surv_rate(int age) {

545N/A return predict_yg_surv_rate(age, _short_lived_surv_rate_group);

545N/A }

545N/A

342N/A double accum_yg_surv_rate_pred(int age) {

342N/A return _short_lived_surv_rate_group->accum_surv_rate_pred(age);

342N/A }

342N/A

342N/Aprotected:

342N/A void print_stats (int level, const char* str, double value);

342N/A void print_stats (int level, const char* str, int value);

342N/A void print_par_stats (int level, const char* str, double* data) {

342N/A print_par_stats(level, str, data, true);

342N/A }

342N/A void print_par_stats (int level, const char* str, double* data, bool summary);

342N/A void print_par_buffers (int level, const char* str, double* data, bool summary);

342N/A

342N/A void check_other_times(int level,

342N/A NumberSeq* other_times_ms,

342N/A NumberSeq* calc_other_times_ms) const;

342N/A

342N/A void print_summary (PauseSummary* stats) const;

342N/A void print_abandoned_summary(PauseSummary* non_pop_summary,

342N/A PauseSummary* pop_summary) const;

342N/A

342N/A void print_summary (int level, const char* str, NumberSeq* seq) const;

342N/A void print_summary_sd (int level, const char* str, NumberSeq* seq) const;

342N/A

342N/A double avg_value (double* data);

342N/A double max_value (double* data);

342N/A double sum_of_values (double* data);

342N/A double max_sum (double* data1, double* data2);

342N/A

342N/A int _last_satb_drain_processed_buffers;

342N/A int _last_update_rs_processed_buffers;

342N/A double _last_pause_time_ms;

342N/A

342N/A size_t _bytes_in_to_space_before_gc;

342N/A size_t _bytes_in_to_space_after_gc;

342N/A size_t bytes_in_to_space_during_gc() {

342N/A return

342N/A _bytes_in_to_space_after_gc - _bytes_in_to_space_before_gc;

342N/A }

342N/A size_t _bytes_in_collection_set_before_gc;

342N/A // Used to count used bytes in CS.

342N/A friend class CountCSClosure;

342N/A

342N/A // Statistics kept per GC stoppage, pause or full.

342N/A TruncatedSeq* _recent_prev_end_times_for_all_gcs_sec;

342N/A

342N/A // We track markings.

342N/A int _num_markings;

342N/A double _mark_thread_startup_sec; // Time at startup of marking thread

342N/A

342N/A // Add a new GC of the given duration and end time to the record.

342N/A void update_recent_gc_times(double end_time_sec, double elapsed_ms);

342N/A

342N/A // The head of the list (via "next_in_collection_set()") representing the

342N/A // current collection set.

342N/A HeapRegion* _collection_set;

342N/A size_t _collection_set_size;

342N/A size_t _collection_set_bytes_used_before;

342N/A

342N/A // Info about marking.

342N/A int _n_marks; // Sticky at 2, so we know when we've done at least 2.

342N/A

342N/A // The number of collection pauses at the end of the last mark.

342N/A size_t _n_pauses_at_mark_end;

342N/A

342N/A // ==== This section is for stats related to starting Conc Refinement on time.

342N/A size_t _conc_refine_enabled;

342N/A size_t _conc_refine_zero_traversals;

342N/A size_t _conc_refine_max_traversals;

342N/A // In # of heap regions.

342N/A size_t _conc_refine_current_delta;

342N/A

342N/A // At the beginning of a collection pause, update the variables above,

342N/A // especially the "delta".

342N/A void update_conc_refine_data();

342N/A // ====

342N/A

342N/A // Stash a pointer to the g1 heap.

342N/A G1CollectedHeap* _g1;

342N/A

342N/A // The average time in ms per collection pause, averaged over recent pauses.

342N/A double recent_avg_time_for_pauses_ms();

342N/A

342N/A // The average time in ms for processing CollectedHeap strong roots, per

342N/A // collection pause, averaged over recent pauses.

342N/A double recent_avg_time_for_CH_strong_ms();

342N/A

342N/A // The average time in ms for processing the G1 remembered set, per

342N/A // pause, averaged over recent pauses.

342N/A double recent_avg_time_for_G1_strong_ms();

342N/A

342N/A // The average time in ms for "evacuating followers", per pause, averaged

342N/A // over recent pauses.

342N/A double recent_avg_time_for_evac_ms();

342N/A

342N/A // The number of "recent" GCs recorded in the number sequences

342N/A int number_of_recent_gcs();

342N/A

342N/A // The average survival ratio, computed by the total number of bytes

342N/A // suriviving / total number of bytes before collection over the last

342N/A // several recent pauses.

342N/A double recent_avg_survival_fraction();

342N/A // The survival fraction of the most recent pause; if there have been no

342N/A // pauses, returns 1.0.

342N/A double last_survival_fraction();

342N/A

342N/A // Returns a "conservative" estimate of the recent survival rate, i.e.,

342N/A // one that may be higher than "recent_avg_survival_fraction".

342N/A // This is conservative in several ways:

342N/A // If there have been few pauses, it will assume a potential high

342N/A // variance, and err on the side of caution.

342N/A // It puts a lower bound (currently 0.1) on the value it will return.

342N/A // To try to detect phase changes, if the most recent pause ("latest") has a

342N/A // higher-than average ("avg") survival rate, it returns that rate.

342N/A // "work" version is a utility function; young is restricted to young regions.

342N/A double conservative_avg_survival_fraction_work(double avg,

342N/A double latest);

342N/A

342N/A // The arguments are the two sequences that keep track of the number of bytes

342N/A // surviving and the total number of bytes before collection, resp.,

342N/A // over the last evereal recent pauses

342N/A // Returns the survival rate for the category in the most recent pause.

342N/A // If there have been no pauses, returns 1.0.

342N/A double last_survival_fraction_work(TruncatedSeq* surviving,

342N/A TruncatedSeq* before);

342N/A

342N/A // The arguments are the two sequences that keep track of the number of bytes

342N/A // surviving and the total number of bytes before collection, resp.,

342N/A // over the last several recent pauses

342N/A // Returns the average survival ration over the last several recent pauses

342N/A // If there have been no pauses, return 1.0

342N/A double recent_avg_survival_fraction_work(TruncatedSeq* surviving,

342N/A TruncatedSeq* before);

342N/A

342N/A double conservative_avg_survival_fraction() {

342N/A double avg = recent_avg_survival_fraction();

342N/A double latest = last_survival_fraction();

342N/A return conservative_avg_survival_fraction_work(avg, latest);

342N/A }

342N/A

342N/A // The ratio of gc time to elapsed time, computed over recent pauses.

342N/A double _recent_avg_pause_time_ratio;

342N/A

342N/A double recent_avg_pause_time_ratio() {

342N/A return _recent_avg_pause_time_ratio;

342N/A }

342N/A

342N/A // Number of pauses between concurrent marking.

342N/A size_t _pauses_btwn_concurrent_mark;

342N/A

342N/A size_t _n_marks_since_last_pause;

342N/A

342N/A // True iff CM has been initiated.

342N/A bool _conc_mark_initiated;

342N/A

342N/A // True iff CM should be initiated

342N/A bool _should_initiate_conc_mark;

342N/A bool _should_revert_to_full_young_gcs;

342N/A bool _last_full_young_gc;

342N/A

342N/A // This set of variables tracks the collector efficiency, in order to

342N/A // determine whether we should initiate a new marking.

342N/A double _cur_mark_stop_world_time_ms;

342N/A double _mark_init_start_sec;

342N/A double _mark_remark_start_sec;

342N/A double _mark_cleanup_start_sec;

342N/A double _mark_closure_time_ms;

342N/A

342N/A void calculate_young_list_min_length();

342N/A void calculate_young_list_target_config();

342N/A void calculate_young_list_target_config(size_t rs_lengths);

342N/A size_t calculate_optimal_so_length(size_t young_list_length);

342N/A

342N/Apublic:

342N/A

342N/A G1CollectorPolicy();

342N/A

342N/A virtual G1CollectorPolicy* as_g1_policy() { return this; }

342N/A

342N/A virtual CollectorPolicy::Name kind() {

342N/A return CollectorPolicy::G1CollectorPolicyKind;

342N/A }

342N/A

342N/A void check_prediction_validity();

342N/A

342N/A size_t bytes_in_collection_set() {

342N/A return _bytes_in_collection_set_before_gc;

342N/A }

342N/A

342N/A size_t bytes_in_to_space() {

342N/A return bytes_in_to_space_during_gc();

342N/A }

342N/A

342N/A unsigned calc_gc_alloc_time_stamp() {

342N/A return _all_pause_times_ms->num() + 1;

342N/A }

342N/A

342N/Aprotected:

342N/A

342N/A // Count the number of bytes used in the CS.

342N/A void count_CS_bytes_used();

342N/A

342N/A // Together these do the base cleanup-recording work. Subclasses might

342N/A // want to put something between them.

342N/A void record_concurrent_mark_cleanup_end_work1(size_t freed_bytes,

342N/A size_t max_live_bytes);

342N/A void record_concurrent_mark_cleanup_end_work2();

342N/A

342N/Apublic:

342N/A

342N/A virtual void init();

342N/A

545N/A // Create jstat counters for the policy.

545N/A virtual void initialize_gc_policy_counters();

545N/A

342N/A virtual HeapWord* mem_allocate_work(size_t size,

342N/A bool is_tlab,

342N/A bool* gc_overhead_limit_was_exceeded);

342N/A

342N/A // This method controls how a collector handles one or more

342N/A // of its generations being fully allocated.

342N/A virtual HeapWord* satisfy_failed_allocation(size_t size,

342N/A bool is_tlab);

342N/A

342N/A BarrierSet::Name barrier_set_name() { return BarrierSet::G1SATBCTLogging; }

342N/A

342N/A GenRemSet::Name rem_set_name() { return GenRemSet::CardTable; }

342N/A

342N/A // The number of collection pauses so far.

342N/A long n_pauses() const { return _n_pauses; }

342N/A

342N/A // Update the heuristic info to record a collection pause of the given

342N/A // start time, where the given number of bytes were used at the start.

342N/A // This may involve changing the desired size of a collection set.

342N/A

342N/A virtual void record_stop_world_start();

342N/A

342N/A virtual void record_collection_pause_start(double start_time_sec,

342N/A size_t start_used);

342N/A

342N/A virtual void record_popular_pause_preamble_start();

342N/A virtual void record_popular_pause_preamble_end();

342N/A

342N/A // Must currently be called while the world is stopped.

342N/A virtual void record_concurrent_mark_init_start();

342N/A virtual void record_concurrent_mark_init_end();

342N/A void record_concurrent_mark_init_end_pre(double

342N/A mark_init_elapsed_time_ms);

342N/A

342N/A void record_mark_closure_time(double mark_closure_time_ms);

342N/A

342N/A virtual void record_concurrent_mark_remark_start();

342N/A virtual void record_concurrent_mark_remark_end();

342N/A

342N/A virtual void record_concurrent_mark_cleanup_start();

342N/A virtual void record_concurrent_mark_cleanup_end(size_t freed_bytes,

342N/A size_t max_live_bytes);

342N/A virtual void record_concurrent_mark_cleanup_completed();

342N/A

342N/A virtual void record_concurrent_pause();

342N/A virtual void record_concurrent_pause_end();

342N/A

342N/A virtual void record_collection_pause_end_CH_strong_roots();

342N/A virtual void record_collection_pause_end_G1_strong_roots();

342N/A

342N/A virtual void record_collection_pause_end(bool popular, bool abandoned);

342N/A

342N/A // Record the fact that a full collection occurred.

342N/A virtual void record_full_collection_start();

342N/A virtual void record_full_collection_end();

342N/A

342N/A void record_ext_root_scan_time(int worker_i, double ms) {

342N/A _par_last_ext_root_scan_times_ms[worker_i] = ms;

342N/A }

342N/A

342N/A void record_mark_stack_scan_time(int worker_i, double ms) {

342N/A _par_last_mark_stack_scan_times_ms[worker_i] = ms;

342N/A }

342N/A

342N/A void record_scan_only_time(int worker_i, double ms, int n) {

342N/A _par_last_scan_only_times_ms[worker_i] = ms;

342N/A _par_last_scan_only_regions_scanned[worker_i] = (double) n;

342N/A }

342N/A

342N/A void record_satb_drain_time(double ms) {

342N/A _cur_satb_drain_time_ms = ms;

342N/A _satb_drain_time_set = true;

342N/A }

342N/A

342N/A void record_satb_drain_processed_buffers (int processed_buffers) {

342N/A _last_satb_drain_processed_buffers = processed_buffers;

342N/A }

342N/A

342N/A void record_mod_union_time(double ms) {

342N/A _all_mod_union_times_ms->add(ms);

342N/A }

342N/A

342N/A void record_update_rs_start_time(int thread, double ms) {

342N/A _par_last_update_rs_start_times_ms[thread] = ms;

342N/A }

342N/A

342N/A void record_update_rs_time(int thread, double ms) {

342N/A _par_last_update_rs_times_ms[thread] = ms;

342N/A }

342N/A

342N/A void record_update_rs_processed_buffers (int thread,

342N/A double processed_buffers) {

342N/A _par_last_update_rs_processed_buffers[thread] = processed_buffers;

342N/A }

342N/A

342N/A void record_scan_rs_start_time(int thread, double ms) {

342N/A _par_last_scan_rs_start_times_ms[thread] = ms;

342N/A }

342N/A

342N/A void record_scan_rs_time(int thread, double ms) {

342N/A _par_last_scan_rs_times_ms[thread] = ms;

342N/A }

342N/A

342N/A void record_scan_new_refs_time(int thread, double ms) {

342N/A _par_last_scan_new_refs_times_ms[thread] = ms;

342N/A }

342N/A

342N/A double get_scan_new_refs_time(int thread) {

342N/A return _par_last_scan_new_refs_times_ms[thread];

342N/A }

342N/A

342N/A void reset_obj_copy_time(int thread) {

342N/A _par_last_obj_copy_times_ms[thread] = 0.0;

342N/A }

342N/A

342N/A void reset_obj_copy_time() {

342N/A reset_obj_copy_time(0);

342N/A }

342N/A

342N/A void record_obj_copy_time(int thread, double ms) {

342N/A _par_last_obj_copy_times_ms[thread] += ms;

342N/A }

342N/A

342N/A void record_obj_copy_time(double ms) {

342N/A record_obj_copy_time(0, ms);

342N/A }

342N/A

342N/A void record_termination_time(int thread, double ms) {

342N/A _par_last_termination_times_ms[thread] = ms;

342N/A }

342N/A

342N/A void record_termination_time(double ms) {

342N/A record_termination_time(0, ms);

342N/A }

342N/A

342N/A void record_pause_time(double ms) {

342N/A _last_pause_time_ms = ms;

342N/A }

342N/A

342N/A void record_clear_ct_time(double ms) {

342N/A _cur_clear_ct_time_ms = ms;

342N/A }

342N/A

342N/A void record_par_time(double ms) {

342N/A _cur_collection_par_time_ms = ms;

342N/A }

342N/A

342N/A void record_aux_start_time(int i) {

342N/A guarantee(i < _aux_num, "should be within range");

342N/A _cur_aux_start_times_ms[i] = os::elapsedTime() * 1000.0;

342N/A }

342N/A

342N/A void record_aux_end_time(int i) {

342N/A guarantee(i < _aux_num, "should be within range");

342N/A double ms = os::elapsedTime() * 1000.0 - _cur_aux_start_times_ms[i];

342N/A _cur_aux_times_set[i] = true;

342N/A _cur_aux_times_ms[i] += ms;

342N/A }

342N/A

342N/A void record_pop_compute_rc_start();

342N/A void record_pop_compute_rc_end();

342N/A

342N/A void record_pop_evac_start();

342N/A void record_pop_evac_end();

342N/A

342N/A // Record the fact that "bytes" bytes allocated in a region.

342N/A void record_before_bytes(size_t bytes);

342N/A void record_after_bytes(size_t bytes);

342N/A

342N/A // Returns "true" if this is a good time to do a collection pause.

342N/A // The "word_size" argument, if non-zero, indicates the size of an

342N/A // allocation request that is prompting this query.

342N/A virtual bool should_do_collection_pause(size_t word_size) = 0;

342N/A

342N/A // Choose a new collection set. Marks the chosen regions as being

342N/A // "in_collection_set", and links them together. The head and number of

342N/A // the collection set are available via access methods.

342N/A // If "pop_region" is non-NULL, it is a popular region that has already

342N/A // been added to the collection set.

342N/A virtual void choose_collection_set(HeapRegion* pop_region = NULL) = 0;

342N/A

342N/A void clear_collection_set() { _collection_set = NULL; }

342N/A

342N/A // The head of the list (via "next_in_collection_set()") representing the

342N/A // current collection set.

342N/A HeapRegion* collection_set() { return _collection_set; }

342N/A

342N/A // Sets the collection set to the given single region.

342N/A virtual void set_single_region_collection_set(HeapRegion* hr);

342N/A

342N/A // The number of elements in the current collection set.

342N/A size_t collection_set_size() { return _collection_set_size; }

342N/A

342N/A // Add "hr" to the CS.

342N/A void add_to_collection_set(HeapRegion* hr);

342N/A

342N/A bool should_initiate_conc_mark() { return _should_initiate_conc_mark; }

342N/A void set_should_initiate_conc_mark() { _should_initiate_conc_mark = true; }

342N/A void unset_should_initiate_conc_mark(){ _should_initiate_conc_mark = false; }

342N/A

342N/A void checkpoint_conc_overhead();

342N/A

342N/A // If an expansion would be appropriate, because recent GC overhead had

342N/A // exceeded the desired limit, return an amount to expand by.

342N/A virtual size_t expansion_amount();

342N/A

342N/A // note start of mark thread

342N/A void note_start_of_mark_thread();

342N/A

342N/A // The marked bytes of the "r" has changed; reclassify it's desirability

342N/A // for marking. Also asserts that "r" is eligible for a CS.

342N/A virtual void note_change_in_marked_bytes(HeapRegion* r) = 0;

342N/A

342N/A#ifndef PRODUCT

342N/A // Check any appropriate marked bytes info, asserting false if

342N/A // something's wrong, else returning "true".

342N/A virtual bool assertMarkedBytesDataOK() = 0;

342N/A#endif

342N/A

342N/A // Print tracing information.

342N/A void print_tracing_info() const;

342N/A

342N/A // Print stats on young survival ratio

342N/A void print_yg_surv_rate_info() const;

342N/A

545N/A void finished_recalculating_age_indexes(bool is_survivors) {

545N/A if (is_survivors) {

545N/A _survivor_surv_rate_group->finished_recalculating_age_indexes();

545N/A } else {

545N/A _short_lived_surv_rate_group->finished_recalculating_age_indexes();

545N/A }

342N/A // do that for any other surv rate groups

342N/A }

342N/A

342N/A bool should_add_next_region_to_young_list();

342N/A

342N/A bool in_young_gc_mode() {

342N/A return _in_young_gc_mode;

342N/A }

342N/A void set_in_young_gc_mode(bool in_young_gc_mode) {

342N/A _in_young_gc_mode = in_young_gc_mode;

342N/A }

342N/A

342N/A bool full_young_gcs() {

342N/A return _full_young_gcs;

342N/A }

342N/A void set_full_young_gcs(bool full_young_gcs) {

342N/A _full_young_gcs = full_young_gcs;

342N/A }

342N/A

342N/A bool adaptive_young_list_length() {

342N/A return _adaptive_young_list_length;

342N/A }

342N/A void set_adaptive_young_list_length(bool adaptive_young_list_length) {

342N/A _adaptive_young_list_length = adaptive_young_list_length;

342N/A }

342N/A

342N/A inline double get_gc_eff_factor() {

342N/A double ratio = _known_garbage_ratio;

342N/A

342N/A double square = ratio * ratio;

342N/A // square = square * square;

342N/A double ret = square * 9.0 + 1.0;

342N/A#if 0

342N/A gclog_or_tty->print_cr("ratio = %1.2lf, ret = %1.2lf", ratio, ret);

342N/A#endif // 0

342N/A guarantee(0.0 <= ret && ret < 10.0, "invariant!");

342N/A return ret;

342N/A }

342N/A

342N/A //

342N/A // Survivor regions policy.

342N/A //

342N/Aprotected:

342N/A

342N/A // Current tenuring threshold, set to 0 if the collector reaches the

342N/A // maximum amount of suvivors regions.

342N/A int _tenuring_threshold;

342N/A

545N/A // The limit on the number of regions allocated for survivors.

545N/A size_t _max_survivor_regions;

545N/A

545N/A // The amount of survor regions after a collection.

545N/A size_t _recorded_survivor_regions;

545N/A // List of survivor regions.

545N/A HeapRegion* _recorded_survivor_head;

545N/A HeapRegion* _recorded_survivor_tail;

545N/A

545N/A ageTable _survivors_age_table;

545N/A

342N/Apublic:

342N/A

342N/A inline GCAllocPurpose

342N/A evacuation_destination(HeapRegion* src_region, int age, size_t word_sz) {

342N/A if (age < _tenuring_threshold && src_region->is_young()) {

342N/A return GCAllocForSurvived;

342N/A } else {

342N/A return GCAllocForTenured;

342N/A }

342N/A }

342N/A

342N/A inline bool track_object_age(GCAllocPurpose purpose) {

342N/A return purpose == GCAllocForSurvived;

342N/A }

342N/A

342N/A inline GCAllocPurpose alternative_purpose(int purpose) {

342N/A return GCAllocForTenured;

342N/A }

342N/A

545N/A static const size_t REGIONS_UNLIMITED = ~(size_t)0;

545N/A

545N/A size_t max_regions(int purpose);

342N/A

342N/A // The limit on regions for a particular purpose is reached.

342N/A void note_alloc_region_limit_reached(int purpose) {

342N/A if (purpose == GCAllocForSurvived) {

342N/A _tenuring_threshold = 0;

342N/A }

342N/A }

342N/A

342N/A void note_start_adding_survivor_regions() {

342N/A _survivor_surv_rate_group->start_adding_regions();

342N/A }

342N/A

342N/A void note_stop_adding_survivor_regions() {

342N/A _survivor_surv_rate_group->stop_adding_regions();

342N/A }

545N/A

545N/A void record_survivor_regions(size_t regions,

545N/A HeapRegion* head,

545N/A HeapRegion* tail) {

545N/A _recorded_survivor_regions = regions;

545N/A _recorded_survivor_head = head;

545N/A _recorded_survivor_tail = tail;

545N/A }

545N/A

545N/A void record_thread_age_table(ageTable* age_table)

545N/A {

545N/A _survivors_age_table.merge_par(age_table);

545N/A }

545N/A

545N/A // Calculates survivor space parameters.

545N/A void calculate_survivors_policy();

545N/A

342N/A};

342N/A

342N/A

342N/Aclass G1CollectorPolicy_BestRegionsFirst: public G1CollectorPolicy {

342N/A CollectionSetChooser* _collectionSetChooser;

342N/A // If the estimated is less then desirable, resize if possible.

342N/A void expand_if_possible(size_t numRegions);

342N/A

342N/A virtual void choose_collection_set(HeapRegion* pop_region = NULL);

342N/A virtual void record_collection_pause_start(double start_time_sec,

342N/A size_t start_used);

342N/A virtual void record_concurrent_mark_cleanup_end(size_t freed_bytes,

342N/A size_t max_live_bytes);

342N/A virtual void record_full_collection_end();

342N/A

342N/Apublic:

342N/A G1CollectorPolicy_BestRegionsFirst() {

342N/A _collectionSetChooser = new CollectionSetChooser();

342N/A }

342N/A void record_collection_pause_end(bool popular, bool abandoned);

342N/A bool should_do_collection_pause(size_t word_size);

342N/A virtual void set_single_region_collection_set(HeapRegion* hr);

342N/A // This is not needed any more, after the CSet choosing code was

342N/A // changed to use the pause prediction work. But let's leave the

342N/A // hook in just in case.

342N/A void note_change_in_marked_bytes(HeapRegion* r) { }

342N/A#ifndef PRODUCT

342N/A bool assertMarkedBytesDataOK();

342N/A#endif

342N/A};

342N/A

342N/A

342N/Ainline double variance(int n, double sum_of_squares, double sum) {

342N/A double n_d = (double)n;

342N/A double avg = sum/n_d;

342N/A return (sum_of_squares - 2.0 * avg * sum + n_d * avg * avg) / n_d;

342N/A}

342N/A