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src/share/vm/gc/g1/g1Measurements.hpp
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rev 10472 : 8151711: Move G1 number sequences out of the G1 collector policy
Reviewed-by:
rev 10473 : [mq]: measurements-fix
@@ -1,7 +1,7 @@
/*
- * Copyright (c) 2001, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
@@ -20,92 +20,30 @@
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
-#ifndef SHARE_VM_GC_G1_G1COLLECTORPOLICY_HPP
-#define SHARE_VM_GC_G1_G1COLLECTORPOLICY_HPP
+#ifndef SHARE_VM_GC_G1_G1MEASUREMENTS_HPP
+#define SHARE_VM_GC_G1_G1MEASUREMENTS_HPP
-#include "gc/g1/g1CollectorState.hpp"
-#include "gc/g1/g1GCPhaseTimes.hpp"
-#include "gc/g1/g1InCSetState.hpp"
-#include "gc/g1/g1InitialMarkToMixedTimeTracker.hpp"
-#include "gc/g1/g1MMUTracker.hpp"
-#include "gc/g1/g1Predictions.hpp"
-#include "gc/shared/collectorPolicy.hpp"
-#include "utilities/pair.hpp"
-
-// A G1CollectorPolicy makes policy decisions that determine the
-// characteristics of the collector. Examples include:
-// * choice of collection set.
-// * when to collect.
-
-class HeapRegion;
-class G1CollectionSet;
-class CollectionSetChooser;
-class G1IHOPControl;
-class G1YoungGenSizer;
-
-class G1CollectorPolicy: public CollectorPolicy {
- private:
- G1IHOPControl* _ihop_control;
-
- G1IHOPControl* create_ihop_control() const;
- // Update the IHOP control with necessary statistics.
- void update_ihop_prediction(double mutator_time_s,
- size_t mutator_alloc_bytes,
- size_t young_gen_size);
- void report_ihop_statistics();
+#include "memory/allocation.hpp"
+#include "utilities/globalDefinitions.hpp"
- G1Predictions _predictor;
+class TruncatedSeq;
+class G1Predictions;
- double get_new_prediction(TruncatedSeq const* seq) const;
- size_t get_new_size_prediction(TruncatedSeq const* seq) const;
-
- G1MMUTracker* _mmu_tracker;
-
- void initialize_alignments();
- void initialize_flags();
-
- double _full_collection_start_sec;
+class G1Measurements: public CHeapObj<mtGC> {
+ const static int TruncatedSeqLength = 10;
+ const static int NumPrevPausesForHeuristics = 10;
+ G1Predictions* _predictor;
// These exclude marking times.
TruncatedSeq* _recent_gc_times_ms;
TruncatedSeq* _concurrent_mark_remark_times_ms;
TruncatedSeq* _concurrent_mark_cleanup_times_ms;
- // Ratio check data for determining if heap growth is necessary.
- uint _ratio_over_threshold_count;
- double _ratio_over_threshold_sum;
- uint _pauses_since_start;
-
- uint _young_list_target_length;
- uint _young_list_fixed_length;
-
- // The max number of regions we can extend the eden by while the GC
- // locker is active. This should be >= _young_list_target_length;
- uint _young_list_max_length;
-
- SurvRateGroup* _short_lived_surv_rate_group;
- SurvRateGroup* _survivor_surv_rate_group;
- // add here any more surv rate groups
-
- double _gc_overhead_perc;
-
- double _reserve_factor;
- uint _reserve_regions;
-
- enum PredictionConstants {
- TruncatedSeqLength = 10,
- NumPrevPausesForHeuristics = 10,
- // MinOverThresholdForGrowth must be less than NumPrevPausesForHeuristics,
- // representing the minimum number of pause time ratios that exceed
- // GCTimeRatio before a heap expansion will be triggered.
- MinOverThresholdForGrowth = 4
- };
-
TruncatedSeq* _alloc_rate_ms_seq;
double _prev_collection_pause_end_ms;
TruncatedSeq* _rs_length_diff_seq;
TruncatedSeq* _cost_per_card_ms_seq;
@@ -122,68 +60,60 @@
TruncatedSeq* _pending_cards_seq;
TruncatedSeq* _rs_lengths_seq;
TruncatedSeq* _cost_per_byte_ms_during_cm_seq;
- G1YoungGenSizer* _young_gen_sizer;
-
- uint _free_regions_at_end_of_collection;
-
- size_t _max_rs_lengths;
-
- size_t _rs_lengths_prediction;
-
-#ifndef PRODUCT
- bool verify_young_ages(HeapRegion* head, SurvRateGroup *surv_rate_group);
-#endif // PRODUCT
-
- void adjust_concurrent_refinement(double update_rs_time,
- double update_rs_processed_buffers,
- double goal_ms);
-
- double _pause_time_target_ms;
+ // Statistics kept per GC stoppage, pause or full.
+ TruncatedSeq* _recent_prev_end_times_for_all_gcs_sec;
- size_t _pending_cards;
+ // The ratio of gc time to elapsed time, computed over recent pauses,
+ // and the ratio for just the last pause.
+ double _recent_avg_pause_time_ratio;
+ double _last_pause_time_ratio;
- // The amount of allocated bytes in old gen during the last mutator and the following
- // young GC phase.
- size_t _bytes_allocated_in_old_since_last_gc;
+ double get_new_prediction(TruncatedSeq const* seq) const;
+ size_t get_new_size_prediction(TruncatedSeq const* seq) const;
- G1InitialMarkToMixedTimeTracker _initial_mark_to_mixed;
+ void compute_pause_time_ratio(double interval_ms, double pause_time_ms);
public:
- const G1Predictions& predictor() const { return _predictor; }
-
- // Add the given number of bytes to the total number of allocated bytes in the old gen.
- void add_bytes_allocated_in_old_since_last_gc(size_t bytes) { _bytes_allocated_in_old_since_last_gc += bytes; }
+ G1Measurements(G1Predictions* predictor);
- // Accessors
-
- void set_region_eden(HeapRegion* hr, int young_index_in_cset) {
- hr->set_eden();
- hr->install_surv_rate_group(_short_lived_surv_rate_group);
- hr->set_young_index_in_cset(young_index_in_cset);
+ double prev_collection_pause_end_ms() const {
+ return _prev_collection_pause_end_ms;
}
- void set_region_survivor(HeapRegion* hr, int young_index_in_cset) {
- assert(hr->is_survivor(), "pre-condition");
- hr->install_surv_rate_group(_survivor_surv_rate_group);
- hr->set_young_index_in_cset(young_index_in_cset);
+ double recent_avg_pause_time_ratio() const {
+ return _recent_avg_pause_time_ratio;
}
-#ifndef PRODUCT
- bool verify_young_ages();
-#endif // PRODUCT
+ double last_pause_time_ratio() const {
+ return _last_pause_time_ratio;
+ }
- void record_max_rs_lengths(size_t rs_lengths) {
- _max_rs_lengths = rs_lengths;
+ void append_prev_collection_pause_end_ms(double ms) {
+ _prev_collection_pause_end_ms += ms;
}
- size_t predict_rs_lengths() const;
+ void report_concurrent_mark_remark_times_ms(double ms);
+ void report_concurrent_mark_cleanup_times_ms(double ms);
+ void report_alloc_rate_ms(double alloc_rate);
+ void report_cost_per_card_ms(double cost_per_card_ms);
+ void report_cost_scan_hcc(double cost_scan_hcc);
+ void report_cost_per_entry_ms(double cost_per_entry_ms, bool last_gc_was_young);
+ void report_cards_per_entry_ratio(double cards_per_entry_ratio, bool last_gc_was_young);
+ void report_rs_length_diff(double rs_length_diff);
+ void report_cost_per_byte_ms(double cost_per_byte_ms, bool in_marking_window);
+ void report_young_other_cost_per_region_ms(double other_cost_per_region_ms);
+ void report_non_young_other_cost_per_region_ms(double other_cost_per_region_ms);
+ void report_constant_other_time_ms(double constant_other_time_ms);
+ void report_pending_cards(double pending_cards);
+ void report_rs_lengths(double rs_lengths);
size_t predict_rs_length_diff() const;
double predict_alloc_rate_ms() const;
+ int num_alloc_rate_ms() const;
double predict_cost_per_card_ms() const;
double predict_scan_hcc_ms() const;
@@ -191,380 +121,33 @@
double predict_young_cards_per_entry_ratio() const;
double predict_mixed_cards_per_entry_ratio() const;
- size_t predict_young_card_num(size_t rs_length) const;
-
- size_t predict_non_young_card_num(size_t rs_length) const;
+ size_t predict_card_num(size_t rs_length, bool gcs_are_young) const;
- double predict_rs_scan_time_ms(size_t card_num) const;
+ double predict_rs_scan_time_ms(size_t card_num, bool gcs_are_young) const;
double predict_mixed_rs_scan_time_ms(size_t card_num) const;
double predict_object_copy_time_ms_during_cm(size_t bytes_to_copy) const;
- double predict_object_copy_time_ms(size_t bytes_to_copy) const;
+ double predict_object_copy_time_ms(size_t bytes_to_copy, bool during_concurrent_mark) const;
double predict_constant_other_time_ms() const;
double predict_young_other_time_ms(size_t young_num) const;
double predict_non_young_other_time_ms(size_t non_young_num) const;
- double predict_base_elapsed_time_ms(size_t pending_cards) const;
- double predict_base_elapsed_time_ms(size_t pending_cards,
- size_t scanned_cards) const;
- size_t predict_bytes_to_copy(HeapRegion* hr) const;
- double predict_region_elapsed_time_ms(HeapRegion* hr, bool for_young_gc) const;
-
- double predict_survivor_regions_evac_time() const;
-
- bool should_update_surv_rate_group_predictors() {
- return collector_state()->last_gc_was_young() && !collector_state()->in_marking_window();
- }
-
- void cset_regions_freed() {
- bool update = should_update_surv_rate_group_predictors();
-
- _short_lived_surv_rate_group->all_surviving_words_recorded(update);
- _survivor_surv_rate_group->all_surviving_words_recorded(update);
- }
-
- G1MMUTracker* mmu_tracker() {
- return _mmu_tracker;
- }
-
- const G1MMUTracker* mmu_tracker() const {
- return _mmu_tracker;
- }
-
- double max_pause_time_ms() const {
- return _mmu_tracker->max_gc_time() * 1000.0;
- }
-
double predict_remark_time_ms() const;
double predict_cleanup_time_ms() const;
- // Returns an estimate of the survival rate of the region at yg-age
- // "yg_age".
- double predict_yg_surv_rate(int age, SurvRateGroup* surv_rate_group) const;
-
- double predict_yg_surv_rate(int age) const;
-
- double accum_yg_surv_rate_pred(int age) const;
-
-protected:
- G1CollectionSet* _collection_set;
- virtual double average_time_ms(G1GCPhaseTimes::GCParPhases phase) const;
- virtual double other_time_ms(double pause_time_ms) const;
-
- double young_other_time_ms() const;
- double non_young_other_time_ms() const;
- double constant_other_time_ms(double pause_time_ms) const;
-
- CollectionSetChooser* cset_chooser() const;
-private:
- // Statistics kept per GC stoppage, pause or full.
- TruncatedSeq* _recent_prev_end_times_for_all_gcs_sec;
+ size_t predict_rs_lengths() const;
+ size_t predict_pending_cards() 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);
-
- // The number of bytes copied during the GC.
- size_t _bytes_copied_during_gc;
-
- // Stash a pointer to the g1 heap.
- G1CollectedHeap* _g1;
-
- G1GCPhaseTimes* _phase_times;
-
- // The ratio of gc time to elapsed time, computed over recent pauses,
- // and the ratio for just the last pause.
- double _recent_avg_pause_time_ratio;
- double _last_pause_time_ratio;
-
- double recent_avg_pause_time_ratio() const {
- return _recent_avg_pause_time_ratio;
- }
-
- // This set of variables tracks the collector efficiency, in order to
- // determine whether we should initiate a new marking.
- double _mark_remark_start_sec;
- double _mark_cleanup_start_sec;
-
- // Updates the internal young list maximum and target lengths. Returns the
- // unbounded young list target length.
- uint update_young_list_max_and_target_length();
- uint update_young_list_max_and_target_length(size_t rs_lengths);
-
- // Update the young list target length either by setting it to the
- // desired fixed value or by calculating it using G1's pause
- // prediction model. If no rs_lengths parameter is passed, predict
- // the RS lengths using the prediction model, otherwise use the
- // given rs_lengths as the prediction.
- // Returns the unbounded young list target length.
- uint update_young_list_target_length(size_t rs_lengths);
-
- // Calculate and return the minimum desired young list target
- // length. This is the minimum desired young list length according
- // to the user's inputs.
- uint calculate_young_list_desired_min_length(uint base_min_length) const;
-
- // Calculate and return the maximum desired young list target
- // length. This is the maximum desired young list length according
- // to the user's inputs.
- uint calculate_young_list_desired_max_length() const;
-
- // Calculate and return the maximum young list target length that
- // can fit into the pause time goal. The parameters are: rs_lengths
- // represent the prediction of how large the young RSet lengths will
- // be, base_min_length is the already existing number of regions in
- // the young list, min_length and max_length are the desired min and
- // max young list length according to the user's inputs.
- uint calculate_young_list_target_length(size_t rs_lengths,
- uint base_min_length,
- uint desired_min_length,
- uint desired_max_length) const;
-
- // Result of the bounded_young_list_target_length() method, containing both the
- // bounded as well as the unbounded young list target lengths in this order.
- typedef Pair<uint, uint, StackObj> YoungTargetLengths;
- YoungTargetLengths young_list_target_lengths(size_t rs_lengths) const;
-
- void update_rs_lengths_prediction();
- void update_rs_lengths_prediction(size_t prediction);
-
- // Calculate and return chunk size (in number of regions) for parallel
- // concurrent mark cleanup.
- uint calculate_parallel_work_chunk_size(uint n_workers, uint n_regions) const;
-
- // Check whether a given young length (young_length) fits into the
- // given target pause time and whether the prediction for the amount
- // of objects to be copied for the given length will fit into the
- // given free space (expressed by base_free_regions). It is used by
- // calculate_young_list_target_length().
- bool predict_will_fit(uint young_length, double base_time_ms,
- uint base_free_regions, double target_pause_time_ms) const;
-
-public:
- size_t pending_cards() const { return _pending_cards; }
-
- // Calculate the minimum number of old regions we'll add to the CSet
- // during a mixed GC.
- uint calc_min_old_cset_length() const;
-
- // Calculate the maximum number of old regions we'll add to the CSet
- // during a mixed GC.
- uint calc_max_old_cset_length() const;
-
- // Returns the given amount of uncollected reclaimable space
- // as a percentage of the current heap capacity.
- double reclaimable_bytes_perc(size_t reclaimable_bytes) const;
-
-private:
- // Sets up marking if proper conditions are met.
- void maybe_start_marking();
-
- // The kind of STW pause.
- enum PauseKind {
- FullGC,
- YoungOnlyGC,
- MixedGC,
- LastYoungGC,
- InitialMarkGC,
- Cleanup,
- Remark
- };
-
- // Calculate PauseKind from internal state.
- PauseKind young_gc_pause_kind() const;
- // Record the given STW pause with the given start and end times (in s).
- void record_pause(PauseKind kind, double start, double end);
- // Indicate that we aborted marking before doing any mixed GCs.
- void abort_time_to_mixed_tracking();
-public:
-
- G1CollectorPolicy();
-
- virtual ~G1CollectorPolicy();
-
- virtual G1CollectorPolicy* as_g1_policy() { return this; }
-
- G1CollectorState* collector_state() const;
-
- G1GCPhaseTimes* phase_times() const { return _phase_times; }
-
- // Check the current value of the young list RSet lengths and
- // compare it against the last prediction. If the current value is
- // higher, recalculate the young list target length prediction.
- void revise_young_list_target_length_if_necessary(size_t rs_lengths);
-
- // This should be called after the heap is resized.
- void record_new_heap_size(uint new_number_of_regions);
-
- void init();
-
- virtual void note_gc_start(uint num_active_workers);
-
- // Create jstat counters for the policy.
- virtual void initialize_gc_policy_counters();
-
- bool need_to_start_conc_mark(const char* source, size_t alloc_word_size = 0);
-
- bool about_to_start_mixed_phase() const;
-
- // Record the start and end of an evacuation pause.
- void record_collection_pause_start(double start_time_sec);
- void record_collection_pause_end(double pause_time_ms, size_t cards_scanned, size_t heap_used_bytes_before_gc);
-
- // Record the start and end of a full collection.
- void record_full_collection_start();
- void record_full_collection_end();
-
- // Must currently be called while the world is stopped.
- void record_concurrent_mark_init_end(double mark_init_elapsed_time_ms);
-
- // Record start and end of remark.
- void record_concurrent_mark_remark_start();
- void record_concurrent_mark_remark_end();
-
- // Record start, end, and completion of cleanup.
- void record_concurrent_mark_cleanup_start();
- void record_concurrent_mark_cleanup_end();
- void record_concurrent_mark_cleanup_completed();
-
- virtual void print_phases();
-
- // Record how much space we copied during a GC. This is typically
- // called when a GC alloc region is being retired.
- void record_bytes_copied_during_gc(size_t bytes) {
- _bytes_copied_during_gc += bytes;
- }
-
- // The amount of space we copied during a GC.
- size_t bytes_copied_during_gc() const {
- return _bytes_copied_during_gc;
- }
-
- // Determine whether there are candidate regions so that the
- // next GC should be mixed. The two action strings are used
- // in the ergo output when the method returns true or false.
- bool next_gc_should_be_mixed(const char* true_action_str,
- const char* false_action_str) const;
-
- virtual void finalize_collection_set(double target_pause_time_ms);
-private:
- // Set the state to start a concurrent marking cycle and clear
- // _initiate_conc_mark_if_possible because it has now been
- // acted on.
- void initiate_conc_mark();
-
-public:
- // This sets the initiate_conc_mark_if_possible() flag to start a
- // new cycle, as long as we are not already in one. It's best if it
- // is called during a safepoint when the test whether a cycle is in
- // progress or not is stable.
- bool force_initial_mark_if_outside_cycle(GCCause::Cause gc_cause);
-
- // This is called at the very beginning of an evacuation pause (it
- // has to be the first thing that the pause does). If
- // initiate_conc_mark_if_possible() is true, and the concurrent
- // marking thread has completed its work during the previous cycle,
- // it will set during_initial_mark_pause() to so that the pause does
- // the initial-mark work and start a marking cycle.
- void decide_on_conc_mark_initiation();
-
- // If an expansion would be appropriate, because recent GC overhead had
- // exceeded the desired limit, return an amount to expand by.
- virtual size_t expansion_amount();
-
- // Clear ratio tracking data used by expansion_amount().
- void clear_ratio_check_data();
-
- // Print stats on young survival ratio
- void print_yg_surv_rate_info() const;
-
- void finished_recalculating_age_indexes(bool is_survivors) {
- if (is_survivors) {
- _survivor_surv_rate_group->finished_recalculating_age_indexes();
- } else {
- _short_lived_surv_rate_group->finished_recalculating_age_indexes();
- }
- // do that for any other surv rate groups
- }
-
- size_t young_list_target_length() const { return _young_list_target_length; }
-
- bool is_young_list_full() const;
-
- bool can_expand_young_list() const;
-
- uint young_list_max_length() const {
- return _young_list_max_length;
- }
-
- bool adaptive_young_list_length() const;
-
- virtual bool should_process_references() const {
- return true;
- }
-
-private:
- //
- // Survivor regions policy.
- //
-
- // Current tenuring threshold, set to 0 if the collector reaches the
- // maximum amount of survivors regions.
- uint _tenuring_threshold;
-
- // The limit on the number of regions allocated for survivors.
- uint _max_survivor_regions;
-
- AgeTable _survivors_age_table;
-
-public:
- uint tenuring_threshold() const { return _tenuring_threshold; }
-
- uint max_survivor_regions() {
- return _max_survivor_regions;
- }
-
- static const uint REGIONS_UNLIMITED = (uint) -1;
-
- uint max_regions(InCSetState dest) const {
- switch (dest.value()) {
- case InCSetState::Young:
- return _max_survivor_regions;
- case InCSetState::Old:
- return REGIONS_UNLIMITED;
- default:
- assert(false, "Unknown dest state: " CSETSTATE_FORMAT, dest.value());
- break;
- }
- // keep some compilers happy
- return 0;
- }
-
- void note_start_adding_survivor_regions() {
- _survivor_surv_rate_group->start_adding_regions();
- }
-
- void note_stop_adding_survivor_regions() {
- _survivor_surv_rate_group->stop_adding_regions();
- }
-
- void record_age_table(AgeTable* age_table) {
- _survivors_age_table.merge(age_table);
- }
-
- void update_max_gc_locker_expansion();
-
- // Calculates survivor space parameters.
- void update_survivors_policy();
-
- virtual void post_heap_initialize();
};
-#endif // SHARE_VM_GC_G1_G1COLLECTORPOLICY_HPP
+#endif // SHARE_VM_GC_G1_G1MEASUREMENTS_HPP
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