ysr@777: /*
xdono@1014:  * Copyright 2001-2009 Sun Microsystems, Inc.  All Rights Reserved.
ysr@777:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
ysr@777:  *
ysr@777:  * This code is free software; you can redistribute it and/or modify it
ysr@777:  * under the terms of the GNU General Public License version 2 only, as
ysr@777:  * published by the Free Software Foundation.
ysr@777:  *
ysr@777:  * This code is distributed in the hope that it will be useful, but WITHOUT
ysr@777:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
ysr@777:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
ysr@777:  * version 2 for more details (a copy is included in the LICENSE file that
ysr@777:  * accompanied this code).
ysr@777:  *
ysr@777:  * You should have received a copy of the GNU General Public License version
ysr@777:  * 2 along with this work; if not, write to the Free Software Foundation,
ysr@777:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
ysr@777:  *
ysr@777:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
ysr@777:  * CA 95054 USA or visit www.sun.com if you need additional information or
ysr@777:  * have any questions.
ysr@777:  *
ysr@777:  */
ysr@777: 
ysr@777: #include "incls/_precompiled.incl"
ysr@777: #include "incls/_g1CollectorPolicy.cpp.incl"
ysr@777: 
ysr@777: #define PREDICTIONS_VERBOSE 0
ysr@777: 
ysr@777: // <NEW PREDICTION>
ysr@777: 
ysr@777: // Different defaults for different number of GC threads
ysr@777: // They were chosen by running GCOld and SPECjbb on debris with different
ysr@777: //   numbers of GC threads and choosing them based on the results
ysr@777: 
ysr@777: // all the same
ysr@777: static double rs_length_diff_defaults[] = {
ysr@777:   0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0
ysr@777: };
ysr@777: 
ysr@777: static double cost_per_card_ms_defaults[] = {
ysr@777:   0.01, 0.005, 0.005, 0.003, 0.003, 0.002, 0.002, 0.0015
ysr@777: };
ysr@777: 
ysr@777: static double cost_per_scan_only_region_ms_defaults[] = {
ysr@777:   1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0
ysr@777: };
ysr@777: 
ysr@777: // all the same
ysr@777: static double fully_young_cards_per_entry_ratio_defaults[] = {
ysr@777:   1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0
ysr@777: };
ysr@777: 
ysr@777: static double cost_per_entry_ms_defaults[] = {
ysr@777:   0.015, 0.01, 0.01, 0.008, 0.008, 0.0055, 0.0055, 0.005
ysr@777: };
ysr@777: 
ysr@777: static double cost_per_byte_ms_defaults[] = {
ysr@777:   0.00006, 0.00003, 0.00003, 0.000015, 0.000015, 0.00001, 0.00001, 0.000009
ysr@777: };
ysr@777: 
ysr@777: // these should be pretty consistent
ysr@777: static double constant_other_time_ms_defaults[] = {
ysr@777:   5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0
ysr@777: };
ysr@777: 
ysr@777: 
ysr@777: static double young_other_cost_per_region_ms_defaults[] = {
ysr@777:   0.3, 0.2, 0.2, 0.15, 0.15, 0.12, 0.12, 0.1
ysr@777: };
ysr@777: 
ysr@777: static double non_young_other_cost_per_region_ms_defaults[] = {
ysr@777:   1.0, 0.7, 0.7, 0.5, 0.5, 0.42, 0.42, 0.30
ysr@777: };
ysr@777: 
ysr@777: // </NEW PREDICTION>
ysr@777: 
ysr@777: G1CollectorPolicy::G1CollectorPolicy() :
ysr@777:   _parallel_gc_threads((ParallelGCThreads > 0) ? ParallelGCThreads : 1),
ysr@777:   _n_pauses(0),
ysr@777:   _recent_CH_strong_roots_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)),
ysr@777:   _recent_G1_strong_roots_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)),
ysr@777:   _recent_evac_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)),
ysr@777:   _recent_pause_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)),
ysr@777:   _recent_rs_sizes(new TruncatedSeq(NumPrevPausesForHeuristics)),
ysr@777:   _recent_gc_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)),
ysr@777:   _all_pause_times_ms(new NumberSeq()),
ysr@777:   _stop_world_start(0.0),
ysr@777:   _all_stop_world_times_ms(new NumberSeq()),
ysr@777:   _all_yield_times_ms(new NumberSeq()),
ysr@777: 
ysr@777:   _all_mod_union_times_ms(new NumberSeq()),
ysr@777: 
ysr@777:   _non_pop_summary(new NonPopSummary()),
ysr@777:   _pop_summary(new PopSummary()),
ysr@777:   _non_pop_abandoned_summary(new NonPopAbandonedSummary()),
ysr@777:   _pop_abandoned_summary(new PopAbandonedSummary()),
ysr@777: 
ysr@777:   _cur_clear_ct_time_ms(0.0),
ysr@777: 
ysr@777:   _region_num_young(0),
ysr@777:   _region_num_tenured(0),
ysr@777:   _prev_region_num_young(0),
ysr@777:   _prev_region_num_tenured(0),
ysr@777: 
ysr@777:   _aux_num(10),
ysr@777:   _all_aux_times_ms(new NumberSeq[_aux_num]),
ysr@777:   _cur_aux_start_times_ms(new double[_aux_num]),
ysr@777:   _cur_aux_times_ms(new double[_aux_num]),
ysr@777:   _cur_aux_times_set(new bool[_aux_num]),
ysr@777: 
ysr@777:   _pop_compute_rc_start(0.0),
ysr@777:   _pop_evac_start(0.0),
ysr@777: 
ysr@777:   _concurrent_mark_init_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)),
ysr@777:   _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)),
ysr@777:   _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)),
ysr@777: 
ysr@777:   // <NEW PREDICTION>
ysr@777: 
ysr@777:   _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
ysr@777:   _prev_collection_pause_end_ms(0.0),
ysr@777:   _pending_card_diff_seq(new TruncatedSeq(TruncatedSeqLength)),
ysr@777:   _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)),
ysr@777:   _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
ysr@777:   _cost_per_scan_only_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
ysr@777:   _fully_young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)),
ysr@777:   _partially_young_cards_per_entry_ratio_seq(
ysr@777:                                          new TruncatedSeq(TruncatedSeqLength)),
ysr@777:   _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
ysr@777:   _partially_young_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
ysr@777:   _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
ysr@777:   _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)),
ysr@777:   _cost_per_scan_only_region_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)),
ysr@777:   _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
ysr@777:   _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
ysr@777:   _non_young_other_cost_per_region_ms_seq(
ysr@777:                                          new TruncatedSeq(TruncatedSeqLength)),
ysr@777: 
ysr@777:   _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)),
ysr@777:   _scanned_cards_seq(new TruncatedSeq(TruncatedSeqLength)),
ysr@777:   _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)),
ysr@777: 
ysr@777:   _pause_time_target_ms((double) G1MaxPauseTimeMS),
ysr@777: 
ysr@777:   // </NEW PREDICTION>
ysr@777: 
ysr@777:   _in_young_gc_mode(false),
ysr@777:   _full_young_gcs(true),
ysr@777:   _full_young_pause_num(0),
ysr@777:   _partial_young_pause_num(0),
ysr@777: 
ysr@777:   _during_marking(false),
ysr@777:   _in_marking_window(false),
ysr@777:   _in_marking_window_im(false),
ysr@777: 
ysr@777:   _known_garbage_ratio(0.0),
ysr@777:   _known_garbage_bytes(0),
ysr@777: 
ysr@777:   _young_gc_eff_seq(new TruncatedSeq(TruncatedSeqLength)),
ysr@777:   _target_pause_time_ms(-1.0),
ysr@777: 
ysr@777:    _recent_prev_end_times_for_all_gcs_sec(new TruncatedSeq(NumPrevPausesForHeuristics)),
ysr@777: 
ysr@777:   _recent_CS_bytes_used_before(new TruncatedSeq(NumPrevPausesForHeuristics)),
ysr@777:   _recent_CS_bytes_surviving(new TruncatedSeq(NumPrevPausesForHeuristics)),
ysr@777: 
ysr@777:   _recent_avg_pause_time_ratio(0.0),
ysr@777:   _num_markings(0),
ysr@777:   _n_marks(0),
ysr@777:   _n_pauses_at_mark_end(0),
ysr@777: 
ysr@777:   _all_full_gc_times_ms(new NumberSeq()),
ysr@777: 
ysr@777:   _conc_refine_enabled(0),
ysr@777:   _conc_refine_zero_traversals(0),
ysr@777:   _conc_refine_max_traversals(0),
ysr@777:   _conc_refine_current_delta(G1ConcRefineInitialDelta),
ysr@777: 
ysr@777:   // G1PausesBtwnConcMark defaults to -1
ysr@777:   // so the hack is to do the cast  QQQ FIXME
ysr@777:   _pauses_btwn_concurrent_mark((size_t)G1PausesBtwnConcMark),
ysr@777:   _n_marks_since_last_pause(0),
ysr@777:   _conc_mark_initiated(false),
ysr@777:   _should_initiate_conc_mark(false),
ysr@777:   _should_revert_to_full_young_gcs(false),
ysr@777:   _last_full_young_gc(false),
ysr@777: 
ysr@777:   _prev_collection_pause_used_at_end_bytes(0),
ysr@777: 
ysr@777:   _collection_set(NULL),
ysr@777: #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away
ysr@777: #pragma warning( disable:4355 ) // 'this' : used in base member initializer list
ysr@777: #endif // _MSC_VER
ysr@777: 
ysr@777:   _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived",
ysr@777:                                                  G1YoungSurvRateNumRegionsSummary)),
ysr@777:   _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor",
apetrusenko@980:                                               G1YoungSurvRateNumRegionsSummary)),
ysr@777:   // add here any more surv rate groups
apetrusenko@980:   _recorded_survivor_regions(0),
apetrusenko@980:   _recorded_survivor_head(NULL),
apetrusenko@980:   _recorded_survivor_tail(NULL),
apetrusenko@980:   _survivors_age_table(true)
apetrusenko@980: 
ysr@777: {
ysr@777:   _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime());
ysr@777:   _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0;
ysr@777: 
ysr@777:   _par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads];
ysr@777:   _par_last_mark_stack_scan_times_ms = new double[_parallel_gc_threads];
ysr@777:   _par_last_scan_only_times_ms = new double[_parallel_gc_threads];
ysr@777:   _par_last_scan_only_regions_scanned = new double[_parallel_gc_threads];
ysr@777: 
ysr@777:   _par_last_update_rs_start_times_ms = new double[_parallel_gc_threads];
ysr@777:   _par_last_update_rs_times_ms = new double[_parallel_gc_threads];
ysr@777:   _par_last_update_rs_processed_buffers = new double[_parallel_gc_threads];
ysr@777: 
ysr@777:   _par_last_scan_rs_start_times_ms = new double[_parallel_gc_threads];
ysr@777:   _par_last_scan_rs_times_ms = new double[_parallel_gc_threads];
ysr@777:   _par_last_scan_new_refs_times_ms = new double[_parallel_gc_threads];
ysr@777: 
ysr@777:   _par_last_obj_copy_times_ms = new double[_parallel_gc_threads];
ysr@777: 
ysr@777:   _par_last_termination_times_ms = new double[_parallel_gc_threads];
ysr@777: 
ysr@777:   // we store the data from the first pass during popularity pauses
ysr@777:   _pop_par_last_update_rs_start_times_ms = new double[_parallel_gc_threads];
ysr@777:   _pop_par_last_update_rs_times_ms = new double[_parallel_gc_threads];
ysr@777:   _pop_par_last_update_rs_processed_buffers = new double[_parallel_gc_threads];
ysr@777: 
ysr@777:   _pop_par_last_scan_rs_start_times_ms = new double[_parallel_gc_threads];
ysr@777:   _pop_par_last_scan_rs_times_ms = new double[_parallel_gc_threads];
ysr@777: 
ysr@777:   _pop_par_last_closure_app_times_ms = new double[_parallel_gc_threads];
ysr@777: 
ysr@777:   // start conservatively
ysr@777:   _expensive_region_limit_ms = 0.5 * (double) G1MaxPauseTimeMS;
ysr@777: 
ysr@777:   // <NEW PREDICTION>
ysr@777: 
ysr@777:   int index;
ysr@777:   if (ParallelGCThreads == 0)
ysr@777:     index = 0;
ysr@777:   else if (ParallelGCThreads > 8)
ysr@777:     index = 7;
ysr@777:   else
ysr@777:     index = ParallelGCThreads - 1;
ysr@777: 
ysr@777:   _pending_card_diff_seq->add(0.0);
ysr@777:   _rs_length_diff_seq->add(rs_length_diff_defaults[index]);
ysr@777:   _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]);
ysr@777:   _cost_per_scan_only_region_ms_seq->add(
ysr@777:                                  cost_per_scan_only_region_ms_defaults[index]);
ysr@777:   _fully_young_cards_per_entry_ratio_seq->add(
ysr@777:                             fully_young_cards_per_entry_ratio_defaults[index]);
ysr@777:   _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]);
ysr@777:   _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]);
ysr@777:   _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]);
ysr@777:   _young_other_cost_per_region_ms_seq->add(
ysr@777:                                young_other_cost_per_region_ms_defaults[index]);
ysr@777:   _non_young_other_cost_per_region_ms_seq->add(
ysr@777:                            non_young_other_cost_per_region_ms_defaults[index]);
ysr@777: 
ysr@777:   // </NEW PREDICTION>
ysr@777: 
ysr@777:   double time_slice  = (double) G1TimeSliceMS / 1000.0;
ysr@777:   double max_gc_time = (double) G1MaxPauseTimeMS / 1000.0;
ysr@777:   guarantee(max_gc_time < time_slice,
ysr@777:             "Max GC time should not be greater than the time slice");
ysr@777:   _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time);
ysr@777:   _sigma = (double) G1ConfidencePerc / 100.0;
ysr@777: 
ysr@777:   // start conservatively (around 50ms is about right)
ysr@777:   _concurrent_mark_init_times_ms->add(0.05);
ysr@777:   _concurrent_mark_remark_times_ms->add(0.05);
ysr@777:   _concurrent_mark_cleanup_times_ms->add(0.20);
ysr@777:   _tenuring_threshold = MaxTenuringThreshold;
ysr@777: 
apetrusenko@980:   if (G1UseSurvivorSpace) {
apetrusenko@980:     // if G1FixedSurvivorSpaceSize is 0 which means the size is not
apetrusenko@980:     // fixed, then _max_survivor_regions will be calculated at
apetrusenko@982:     // calculate_young_list_target_config during initialization
apetrusenko@980:     _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes;
apetrusenko@980:   } else {
apetrusenko@980:     _max_survivor_regions = 0;
apetrusenko@980:   }
apetrusenko@980: 
ysr@777:   initialize_all();
ysr@777: }
ysr@777: 
ysr@777: // Increment "i", mod "len"
ysr@777: static void inc_mod(int& i, int len) {
ysr@777:   i++; if (i == len) i = 0;
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::initialize_flags() {
ysr@777:   set_min_alignment(HeapRegion::GrainBytes);
ysr@777:   set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name()));
apetrusenko@982:   if (SurvivorRatio < 1) {
apetrusenko@982:     vm_exit_during_initialization("Invalid survivor ratio specified");
apetrusenko@982:   }
ysr@777:   CollectorPolicy::initialize_flags();
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::init() {
ysr@777:   // Set aside an initial future to_space.
ysr@777:   _g1 = G1CollectedHeap::heap();
ysr@777:   size_t regions = Universe::heap()->capacity() / HeapRegion::GrainBytes;
ysr@777: 
ysr@777:   assert(Heap_lock->owned_by_self(), "Locking discipline.");
ysr@777: 
ysr@777:   if (G1SteadyStateUsed < 50) {
ysr@777:     vm_exit_during_initialization("G1SteadyStateUsed must be at least 50%.");
ysr@777:   }
ysr@777:   if (UseConcMarkSweepGC) {
ysr@777:     vm_exit_during_initialization("-XX:+UseG1GC is incompatible with "
ysr@777:                                   "-XX:+UseConcMarkSweepGC.");
ysr@777:   }
ysr@777: 
apetrusenko@980:   initialize_gc_policy_counters();
apetrusenko@980: 
ysr@777:   if (G1Gen) {
ysr@777:     _in_young_gc_mode = true;
ysr@777: 
ysr@777:     if (G1YoungGenSize == 0) {
ysr@777:       set_adaptive_young_list_length(true);
ysr@777:       _young_list_fixed_length = 0;
ysr@777:     } else {
ysr@777:       set_adaptive_young_list_length(false);
ysr@777:       _young_list_fixed_length = (G1YoungGenSize / HeapRegion::GrainBytes);
ysr@777:     }
ysr@777:      _free_regions_at_end_of_collection = _g1->free_regions();
ysr@777:      _scan_only_regions_at_end_of_collection = 0;
ysr@777:      calculate_young_list_min_length();
ysr@777:      guarantee( _young_list_min_length == 0, "invariant, not enough info" );
ysr@777:      calculate_young_list_target_config();
ysr@777:    } else {
ysr@777:      _young_list_fixed_length = 0;
ysr@777:     _in_young_gc_mode = false;
ysr@777:   }
ysr@777: }
ysr@777: 
apetrusenko@980: // Create the jstat counters for the policy.
apetrusenko@980: void G1CollectorPolicy::initialize_gc_policy_counters()
apetrusenko@980: {
apetrusenko@980:   _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 2 + G1Gen);
apetrusenko@980: }
apetrusenko@980: 
ysr@777: void G1CollectorPolicy::calculate_young_list_min_length() {
ysr@777:   _young_list_min_length = 0;
ysr@777: 
ysr@777:   if (!adaptive_young_list_length())
ysr@777:     return;
ysr@777: 
ysr@777:   if (_alloc_rate_ms_seq->num() > 3) {
ysr@777:     double now_sec = os::elapsedTime();
ysr@777:     double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0;
ysr@777:     double alloc_rate_ms = predict_alloc_rate_ms();
ysr@777:     int min_regions = (int) ceil(alloc_rate_ms * when_ms);
ysr@777:     int current_region_num = (int) _g1->young_list_length();
ysr@777:     _young_list_min_length = min_regions + current_region_num;
ysr@777:   }
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::calculate_young_list_target_config() {
ysr@777:   if (adaptive_young_list_length()) {
ysr@777:     size_t rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq);
ysr@777:     calculate_young_list_target_config(rs_lengths);
ysr@777:   } else {
ysr@777:     if (full_young_gcs())
ysr@777:       _young_list_target_length = _young_list_fixed_length;
ysr@777:     else
ysr@777:       _young_list_target_length = _young_list_fixed_length / 2;
ysr@777:     _young_list_target_length = MAX2(_young_list_target_length, (size_t)1);
ysr@777:     size_t so_length = calculate_optimal_so_length(_young_list_target_length);
ysr@777:     guarantee( so_length < _young_list_target_length, "invariant" );
ysr@777:     _young_list_so_prefix_length = so_length;
ysr@777:   }
apetrusenko@980:   calculate_survivors_policy();
ysr@777: }
ysr@777: 
ysr@777: // This method calculate the optimal scan-only set for a fixed young
ysr@777: // gen size. I couldn't work out how to reuse the more elaborate one,
ysr@777: // i.e. calculate_young_list_target_config(rs_length), as the loops are
ysr@777: // fundamentally different (the other one finds a config for different
ysr@777: // S-O lengths, whereas here we need to do the opposite).
ysr@777: size_t G1CollectorPolicy::calculate_optimal_so_length(
ysr@777:                                                     size_t young_list_length) {
ysr@777:   if (!G1UseScanOnlyPrefix)
ysr@777:     return 0;
ysr@777: 
ysr@777:   if (_all_pause_times_ms->num() < 3) {
ysr@777:     // we won't use a scan-only set at the beginning to allow the rest
ysr@777:     // of the predictors to warm up
ysr@777:     return 0;
ysr@777:   }
ysr@777: 
ysr@777:   if (_cost_per_scan_only_region_ms_seq->num() < 3) {
ysr@777:     // then, we'll only set the S-O set to 1 for a little bit of time,
ysr@777:     // to get enough information on the scanning cost
ysr@777:     return 1;
ysr@777:   }
ysr@777: 
ysr@777:   size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq);
ysr@777:   size_t rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq);
ysr@777:   size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff();
ysr@777:   size_t scanned_cards;
ysr@777:   if (full_young_gcs())
ysr@777:     scanned_cards = predict_young_card_num(adj_rs_lengths);
ysr@777:   else
ysr@777:     scanned_cards = predict_non_young_card_num(adj_rs_lengths);
ysr@777:   double base_time_ms = predict_base_elapsed_time_ms(pending_cards,
ysr@777:                                                      scanned_cards);
ysr@777: 
ysr@777:   size_t so_length = 0;
ysr@777:   double max_gc_eff = 0.0;
ysr@777:   for (size_t i = 0; i < young_list_length; ++i) {
ysr@777:     double gc_eff = 0.0;
ysr@777:     double pause_time_ms = 0.0;
ysr@777:     predict_gc_eff(young_list_length, i, base_time_ms,
ysr@777:                    &gc_eff, &pause_time_ms);
ysr@777:     if (gc_eff > max_gc_eff) {
ysr@777:       max_gc_eff = gc_eff;
ysr@777:       so_length = i;
ysr@777:     }
ysr@777:   }
ysr@777: 
ysr@777:   // set it to 95% of the optimal to make sure we sample the "area"
ysr@777:   // around the optimal length to get up-to-date survival rate data
ysr@777:   return so_length * 950 / 1000;
ysr@777: }
ysr@777: 
ysr@777: // This is a really cool piece of code! It finds the best
ysr@777: // target configuration (young length / scan-only prefix length) so
ysr@777: // that GC efficiency is maximized and that we also meet a pause
ysr@777: // time. It's a triple nested loop. These loops are explained below
ysr@777: // from the inside-out :-)
ysr@777: //
ysr@777: // (a) The innermost loop will try to find the optimal young length
ysr@777: // for a fixed S-O length. It uses a binary search to speed up the
ysr@777: // process. We assume that, for a fixed S-O length, as we add more
ysr@777: // young regions to the CSet, the GC efficiency will only go up (I'll
ysr@777: // skip the proof). So, using a binary search to optimize this process
ysr@777: // makes perfect sense.
ysr@777: //
ysr@777: // (b) The middle loop will fix the S-O length before calling the
ysr@777: // innermost one. It will vary it between two parameters, increasing
ysr@777: // it by a given increment.
ysr@777: //
ysr@777: // (c) The outermost loop will call the middle loop three times.
ysr@777: //   (1) The first time it will explore all possible S-O length values
ysr@777: //   from 0 to as large as it can get, using a coarse increment (to
ysr@777: //   quickly "home in" to where the optimal seems to be).
ysr@777: //   (2) The second time it will explore the values around the optimal
ysr@777: //   that was found by the first iteration using a fine increment.
ysr@777: //   (3) Once the optimal config has been determined by the second
ysr@777: //   iteration, we'll redo the calculation, but setting the S-O length
ysr@777: //   to 95% of the optimal to make sure we sample the "area"
ysr@777: //   around the optimal length to get up-to-date survival rate data
ysr@777: //
ysr@777: // Termination conditions for the iterations are several: the pause
ysr@777: // time is over the limit, we do not have enough to-space, etc.
ysr@777: 
ysr@777: void G1CollectorPolicy::calculate_young_list_target_config(size_t rs_lengths) {
ysr@777:   guarantee( adaptive_young_list_length(), "pre-condition" );
ysr@777: 
ysr@777:   double start_time_sec = os::elapsedTime();
ysr@777:   size_t min_reserve_perc = MAX2((size_t)2, (size_t)G1MinReservePerc);
ysr@777:   min_reserve_perc = MIN2((size_t) 50, min_reserve_perc);
ysr@777:   size_t reserve_regions =
ysr@777:     (size_t) ((double) min_reserve_perc * (double) _g1->n_regions() / 100.0);
ysr@777: 
ysr@777:   if (full_young_gcs() && _free_regions_at_end_of_collection > 0) {
ysr@777:     // we are in fully-young mode and there are free regions in the heap
ysr@777: 
apetrusenko@980:     double survivor_regions_evac_time =
apetrusenko@980:         predict_survivor_regions_evac_time();
apetrusenko@980: 
ysr@777:     size_t min_so_length = 0;
ysr@777:     size_t max_so_length = 0;
ysr@777: 
ysr@777:     if (G1UseScanOnlyPrefix) {
ysr@777:       if (_all_pause_times_ms->num() < 3) {
ysr@777:         // we won't use a scan-only set at the beginning to allow the rest
ysr@777:         // of the predictors to warm up
ysr@777:         min_so_length = 0;
ysr@777:         max_so_length = 0;
ysr@777:       } else if (_cost_per_scan_only_region_ms_seq->num() < 3) {
ysr@777:         // then, we'll only set the S-O set to 1 for a little bit of time,
ysr@777:         // to get enough information on the scanning cost
ysr@777:         min_so_length = 1;
ysr@777:         max_so_length = 1;
ysr@777:       } else if (_in_marking_window || _last_full_young_gc) {
ysr@777:         // no S-O prefix during a marking phase either, as at the end
ysr@777:         // of the marking phase we'll have to use a very small young
ysr@777:         // length target to fill up the rest of the CSet with
ysr@777:         // non-young regions and, if we have lots of scan-only regions
ysr@777:         // left-over, we will not be able to add any more non-young
ysr@777:         // regions.
ysr@777:         min_so_length = 0;
ysr@777:         max_so_length = 0;
ysr@777:       } else {
ysr@777:         // this is the common case; we'll never reach the maximum, we
ysr@777:         // one of the end conditions will fire well before that
ysr@777:         // (hopefully!)
ysr@777:         min_so_length = 0;
ysr@777:         max_so_length = _free_regions_at_end_of_collection - 1;
ysr@777:       }
ysr@777:     } else {
ysr@777:       // no S-O prefix, as the switch is not set, but we still need to
ysr@777:       // do one iteration to calculate the best young target that
ysr@777:       // meets the pause time; this way we reuse the same code instead
ysr@777:       // of replicating it
ysr@777:       min_so_length = 0;
ysr@777:       max_so_length = 0;
ysr@777:     }
ysr@777: 
ysr@777:     double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0;
ysr@777:     size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq);
ysr@777:     size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff();
ysr@777:     size_t scanned_cards;
ysr@777:     if (full_young_gcs())
ysr@777:       scanned_cards = predict_young_card_num(adj_rs_lengths);
ysr@777:     else
ysr@777:       scanned_cards = predict_non_young_card_num(adj_rs_lengths);
ysr@777:     // calculate this once, so that we don't have to recalculate it in
ysr@777:     // the innermost loop
apetrusenko@980:     double base_time_ms = predict_base_elapsed_time_ms(pending_cards, scanned_cards)
apetrusenko@980:                           + survivor_regions_evac_time;
ysr@777:     // the result
ysr@777:     size_t final_young_length = 0;
ysr@777:     size_t final_so_length = 0;
ysr@777:     double final_gc_eff = 0.0;
ysr@777:     // we'll also keep track of how many times we go into the inner loop
ysr@777:     // this is for profiling reasons
ysr@777:     size_t calculations = 0;
ysr@777: 
ysr@777:     // this determines which of the three iterations the outer loop is in
ysr@777:     typedef enum {
ysr@777:       pass_type_coarse,
ysr@777:       pass_type_fine,
ysr@777:       pass_type_final
ysr@777:     } pass_type_t;
ysr@777: 
ysr@777:     // range of the outer loop's iteration
ysr@777:     size_t from_so_length   = min_so_length;
ysr@777:     size_t to_so_length     = max_so_length;
ysr@777:     guarantee( from_so_length <= to_so_length, "invariant" );
ysr@777: 
ysr@777:     // this will keep the S-O length that's found by the second
ysr@777:     // iteration of the outer loop; we'll keep it just in case the third
ysr@777:     // iteration fails to find something
ysr@777:     size_t fine_so_length   = 0;
ysr@777: 
ysr@777:     // the increment step for the coarse (first) iteration
ysr@777:     size_t so_coarse_increments = 5;
ysr@777: 
ysr@777:     // the common case, we'll start with the coarse iteration
ysr@777:     pass_type_t pass = pass_type_coarse;
ysr@777:     size_t so_length_incr = so_coarse_increments;
ysr@777: 
ysr@777:     if (from_so_length == to_so_length) {
ysr@777:       // not point in doing the coarse iteration, we'll go directly into
ysr@777:       // the fine one (we essentially trying to find the optimal young
ysr@777:       // length for a fixed S-O length).
ysr@777:       so_length_incr = 1;
ysr@777:       pass = pass_type_final;
ysr@777:     } else if (to_so_length - from_so_length < 3 * so_coarse_increments) {
ysr@777:       // again, the range is too short so no point in foind the coarse
ysr@777:       // iteration either
ysr@777:       so_length_incr = 1;
ysr@777:       pass = pass_type_fine;
ysr@777:     }
ysr@777: 
ysr@777:     bool done = false;
ysr@777:     // this is the outermost loop
ysr@777:     while (!done) {
apetrusenko@980: #ifdef TRACE_CALC_YOUNG_CONFIG
ysr@777:       // leave this in for debugging, just in case
ysr@777:       gclog_or_tty->print_cr("searching between " SIZE_FORMAT " and " SIZE_FORMAT
ysr@777:                              ", incr " SIZE_FORMAT ", pass %s",
ysr@777:                              from_so_length, to_so_length, so_length_incr,
ysr@777:                              (pass == pass_type_coarse) ? "coarse" :
ysr@777:                              (pass == pass_type_fine) ? "fine" : "final");
apetrusenko@980: #endif // TRACE_CALC_YOUNG_CONFIG
ysr@777: 
ysr@777:       size_t so_length = from_so_length;
ysr@777:       size_t init_free_regions =
ysr@777:         MAX2((size_t)0,
ysr@777:              _free_regions_at_end_of_collection +
ysr@777:              _scan_only_regions_at_end_of_collection - reserve_regions);
ysr@777: 
ysr@777:       // this determines whether a configuration was found
ysr@777:       bool gc_eff_set = false;
ysr@777:       // this is the middle loop
ysr@777:       while (so_length <= to_so_length) {
ysr@777:         // base time, which excludes region-related time; again we
ysr@777:         // calculate it once to avoid recalculating it in the
ysr@777:         // innermost loop
ysr@777:         double base_time_with_so_ms =
ysr@777:                            base_time_ms + predict_scan_only_time_ms(so_length);
ysr@777:         // it's already over the pause target, go around
ysr@777:         if (base_time_with_so_ms > target_pause_time_ms)
ysr@777:           break;
ysr@777: 
ysr@777:         size_t starting_young_length = so_length+1;
ysr@777: 
ysr@777:         // we make sure that the short young length that makes sense
ysr@777:         // (one more than the S-O length) is feasible
ysr@777:         size_t min_young_length = starting_young_length;
ysr@777:         double min_gc_eff;
ysr@777:         bool min_ok;
ysr@777:         ++calculations;
ysr@777:         min_ok = predict_gc_eff(min_young_length, so_length,
ysr@777:                                 base_time_with_so_ms,
ysr@777:                                 init_free_regions, target_pause_time_ms,
ysr@777:                                 &min_gc_eff);
ysr@777: 
ysr@777:         if (min_ok) {
ysr@777:           // the shortest young length is indeed feasible; we'll know
ysr@777:           // set up the max young length and we'll do a binary search
ysr@777:           // between min_young_length and max_young_length
ysr@777:           size_t max_young_length = _free_regions_at_end_of_collection - 1;
ysr@777:           double max_gc_eff = 0.0;
ysr@777:           bool max_ok = false;
ysr@777: 
ysr@777:           // the innermost loop! (finally!)
ysr@777:           while (max_young_length > min_young_length) {
ysr@777:             // we'll make sure that min_young_length is always at a
ysr@777:             // feasible config
ysr@777:             guarantee( min_ok, "invariant" );
ysr@777: 
ysr@777:             ++calculations;
ysr@777:             max_ok = predict_gc_eff(max_young_length, so_length,
ysr@777:                                     base_time_with_so_ms,
ysr@777:                                     init_free_regions, target_pause_time_ms,
ysr@777:                                     &max_gc_eff);
ysr@777: 
ysr@777:             size_t diff = (max_young_length - min_young_length) / 2;
ysr@777:             if (max_ok) {
ysr@777:               min_young_length = max_young_length;
ysr@777:               min_gc_eff = max_gc_eff;
ysr@777:               min_ok = true;
ysr@777:             }
ysr@777:             max_young_length = min_young_length + diff;
ysr@777:           }
ysr@777: 
ysr@777:           // the innermost loop found a config
ysr@777:           guarantee( min_ok, "invariant" );
ysr@777:           if (min_gc_eff > final_gc_eff) {
ysr@777:             // it's the best config so far, so we'll keep it
ysr@777:             final_gc_eff = min_gc_eff;
ysr@777:             final_young_length = min_young_length;
ysr@777:             final_so_length = so_length;
ysr@777:             gc_eff_set = true;
ysr@777:           }
ysr@777:         }
ysr@777: 
ysr@777:         // incremental the fixed S-O length and go around
ysr@777:         so_length += so_length_incr;
ysr@777:       }
ysr@777: 
ysr@777:       // this is the end of the outermost loop and we need to decide
ysr@777:       // what to do during the next iteration
ysr@777:       if (pass == pass_type_coarse) {
ysr@777:         // we just did the coarse pass (first iteration)
ysr@777: 
ysr@777:         if (!gc_eff_set)
ysr@777:           // we didn't find a feasible config so we'll just bail out; of
ysr@777:           // course, it might be the case that we missed it; but I'd say
ysr@777:           // it's a bit unlikely
ysr@777:           done = true;
ysr@777:         else {
ysr@777:           // We did find a feasible config with optimal GC eff during
ysr@777:           // the first pass. So the second pass we'll only consider the
ysr@777:           // S-O lengths around that config with a fine increment.
ysr@777: 
ysr@777:           guarantee( so_length_incr == so_coarse_increments, "invariant" );
ysr@777:           guarantee( final_so_length >= min_so_length, "invariant" );
ysr@777: 
apetrusenko@980: #ifdef TRACE_CALC_YOUNG_CONFIG
ysr@777:           // leave this in for debugging, just in case
ysr@777:           gclog_or_tty->print_cr("  coarse pass: SO length " SIZE_FORMAT,
ysr@777:                                  final_so_length);
apetrusenko@980: #endif // TRACE_CALC_YOUNG_CONFIG
ysr@777: 
ysr@777:           from_so_length =
ysr@777:             (final_so_length - min_so_length > so_coarse_increments) ?
ysr@777:             final_so_length - so_coarse_increments + 1 : min_so_length;
ysr@777:           to_so_length =
ysr@777:             (max_so_length - final_so_length > so_coarse_increments) ?
ysr@777:             final_so_length + so_coarse_increments - 1 : max_so_length;
ysr@777: 
ysr@777:           pass = pass_type_fine;
ysr@777:           so_length_incr = 1;
ysr@777:         }
ysr@777:       } else if (pass == pass_type_fine) {
ysr@777:         // we just finished the second pass
ysr@777: 
ysr@777:         if (!gc_eff_set) {
ysr@777:           // we didn't find a feasible config (yes, it's possible;
ysr@777:           // notice that, sometimes, we go directly into the fine
ysr@777:           // iteration and skip the coarse one) so we bail out
ysr@777:           done = true;
ysr@777:         } else {
ysr@777:           // We did find a feasible config with optimal GC eff
ysr@777:           guarantee( so_length_incr == 1, "invariant" );
ysr@777: 
ysr@777:           if (final_so_length == 0) {
ysr@777:             // The config is of an empty S-O set, so we'll just bail out
ysr@777:             done = true;
ysr@777:           } else {
ysr@777:             // we'll go around once more, setting the S-O length to 95%
ysr@777:             // of the optimal
ysr@777:             size_t new_so_length = 950 * final_so_length / 1000;
ysr@777: 
apetrusenko@980: #ifdef TRACE_CALC_YOUNG_CONFIG
ysr@777:             // leave this in for debugging, just in case
ysr@777:             gclog_or_tty->print_cr("  fine pass: SO length " SIZE_FORMAT
ysr@777:                                    ", setting it to " SIZE_FORMAT,
ysr@777:                                     final_so_length, new_so_length);
apetrusenko@980: #endif // TRACE_CALC_YOUNG_CONFIG
ysr@777: 
ysr@777:             from_so_length = new_so_length;
ysr@777:             to_so_length = new_so_length;
ysr@777:             fine_so_length = final_so_length;
ysr@777: 
ysr@777:             pass = pass_type_final;
ysr@777:           }
ysr@777:         }
ysr@777:       } else if (pass == pass_type_final) {
ysr@777:         // we just finished the final (third) pass
ysr@777: 
ysr@777:         if (!gc_eff_set)
ysr@777:           // we didn't find a feasible config, so we'll just use the one
ysr@777:           // we found during the second pass, which we saved
ysr@777:           final_so_length = fine_so_length;
ysr@777: 
ysr@777:         // and we're done!
ysr@777:         done = true;
ysr@777:       } else {
ysr@777:         guarantee( false, "should never reach here" );
ysr@777:       }
ysr@777: 
ysr@777:       // we now go around the outermost loop
ysr@777:     }
ysr@777: 
ysr@777:     // we should have at least one region in the target young length
apetrusenko@980:     _young_list_target_length =
apetrusenko@980:         MAX2((size_t) 1, final_young_length + _recorded_survivor_regions);
ysr@777:     if (final_so_length >= final_young_length)
ysr@777:       // and we need to ensure that the S-O length is not greater than
ysr@777:       // the target young length (this is being a bit careful)
ysr@777:       final_so_length = 0;
ysr@777:     _young_list_so_prefix_length = final_so_length;
ysr@777:     guarantee( !_in_marking_window || !_last_full_young_gc ||
ysr@777:                _young_list_so_prefix_length == 0, "invariant" );
ysr@777: 
ysr@777:     // let's keep an eye of how long we spend on this calculation
ysr@777:     // right now, I assume that we'll print it when we need it; we
ysr@777:     // should really adde it to the breakdown of a pause
ysr@777:     double end_time_sec = os::elapsedTime();
ysr@777:     double elapsed_time_ms = (end_time_sec - start_time_sec) * 1000.0;
ysr@777: 
apetrusenko@980: #ifdef TRACE_CALC_YOUNG_CONFIG
ysr@777:     // leave this in for debugging, just in case
ysr@777:     gclog_or_tty->print_cr("target = %1.1lf ms, young = " SIZE_FORMAT
ysr@777:                            ", SO = " SIZE_FORMAT ", "
ysr@777:                            "elapsed %1.2lf ms, calcs: " SIZE_FORMAT " (%s%s) "
ysr@777:                            SIZE_FORMAT SIZE_FORMAT,
ysr@777:                            target_pause_time_ms,
ysr@777:                            _young_list_target_length - _young_list_so_prefix_length,
ysr@777:                            _young_list_so_prefix_length,
ysr@777:                            elapsed_time_ms,
ysr@777:                            calculations,
ysr@777:                            full_young_gcs() ? "full" : "partial",
ysr@777:                            should_initiate_conc_mark() ? " i-m" : "",
apetrusenko@980:                            _in_marking_window,
apetrusenko@980:                            _in_marking_window_im);
apetrusenko@980: #endif // TRACE_CALC_YOUNG_CONFIG
ysr@777: 
ysr@777:     if (_young_list_target_length < _young_list_min_length) {
ysr@777:       // bummer; this means that, if we do a pause when the optimal
ysr@777:       // config dictates, we'll violate the pause spacing target (the
ysr@777:       // min length was calculate based on the application's current
ysr@777:       // alloc rate);
ysr@777: 
ysr@777:       // so, we have to bite the bullet, and allocate the minimum
ysr@777:       // number. We'll violate our target, but we just can't meet it.
ysr@777: 
ysr@777:       size_t so_length = 0;
ysr@777:       // a note further up explains why we do not want an S-O length
ysr@777:       // during marking
ysr@777:       if (!_in_marking_window && !_last_full_young_gc)
ysr@777:         // but we can still try to see whether we can find an optimal
ysr@777:         // S-O length
ysr@777:         so_length = calculate_optimal_so_length(_young_list_min_length);
ysr@777: 
apetrusenko@980: #ifdef TRACE_CALC_YOUNG_CONFIG
ysr@777:       // leave this in for debugging, just in case
ysr@777:       gclog_or_tty->print_cr("adjusted target length from "
ysr@777:                              SIZE_FORMAT " to " SIZE_FORMAT
ysr@777:                              ", SO " SIZE_FORMAT,
ysr@777:                              _young_list_target_length, _young_list_min_length,
ysr@777:                              so_length);
apetrusenko@980: #endif // TRACE_CALC_YOUNG_CONFIG
ysr@777: 
ysr@777:       _young_list_target_length =
ysr@777:         MAX2(_young_list_min_length, (size_t)1);
ysr@777:       _young_list_so_prefix_length = so_length;
ysr@777:     }
ysr@777:   } else {
ysr@777:     // we are in a partially-young mode or we've run out of regions (due
ysr@777:     // to evacuation failure)
ysr@777: 
apetrusenko@980: #ifdef TRACE_CALC_YOUNG_CONFIG
ysr@777:     // leave this in for debugging, just in case
ysr@777:     gclog_or_tty->print_cr("(partial) setting target to " SIZE_FORMAT
ysr@777:                            ", SO " SIZE_FORMAT,
ysr@777:                            _young_list_min_length, 0);
apetrusenko@980: #endif // TRACE_CALC_YOUNG_CONFIG
ysr@777: 
ysr@777:     // we'll do the pause as soon as possible and with no S-O prefix
ysr@777:     // (see above for the reasons behind the latter)
ysr@777:     _young_list_target_length =
ysr@777:       MAX2(_young_list_min_length, (size_t) 1);
ysr@777:     _young_list_so_prefix_length = 0;
ysr@777:   }
ysr@777: 
ysr@777:   _rs_lengths_prediction = rs_lengths;
ysr@777: }
ysr@777: 
ysr@777: // This is used by: calculate_optimal_so_length(length). It returns
ysr@777: // the GC eff and predicted pause time for a particular config
ysr@777: void
ysr@777: G1CollectorPolicy::predict_gc_eff(size_t young_length,
ysr@777:                                   size_t so_length,
ysr@777:                                   double base_time_ms,
ysr@777:                                   double* ret_gc_eff,
ysr@777:                                   double* ret_pause_time_ms) {
ysr@777:   double so_time_ms = predict_scan_only_time_ms(so_length);
ysr@777:   double accum_surv_rate_adj = 0.0;
ysr@777:   if (so_length > 0)
ysr@777:     accum_surv_rate_adj = accum_yg_surv_rate_pred((int)(so_length - 1));
ysr@777:   double accum_surv_rate =
ysr@777:     accum_yg_surv_rate_pred((int)(young_length - 1)) - accum_surv_rate_adj;
ysr@777:   size_t bytes_to_copy =
ysr@777:     (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes);
ysr@777:   double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy);
ysr@777:   double young_other_time_ms =
ysr@777:                        predict_young_other_time_ms(young_length - so_length);
ysr@777:   double pause_time_ms =
ysr@777:                 base_time_ms + so_time_ms + copy_time_ms + young_other_time_ms;
ysr@777:   size_t reclaimed_bytes =
ysr@777:     (young_length - so_length) * HeapRegion::GrainBytes - bytes_to_copy;
ysr@777:   double gc_eff = (double) reclaimed_bytes / pause_time_ms;
ysr@777: 
ysr@777:   *ret_gc_eff = gc_eff;
ysr@777:   *ret_pause_time_ms = pause_time_ms;
ysr@777: }
ysr@777: 
ysr@777: // This is used by: calculate_young_list_target_config(rs_length). It
ysr@777: // returns the GC eff of a particular config. It returns false if that
ysr@777: // config violates any of the end conditions of the search in the
ysr@777: // calling method, or true upon success. The end conditions were put
ysr@777: // here since it's called twice and it was best not to replicate them
ysr@777: // in the caller. Also, passing the parameteres avoids having to
ysr@777: // recalculate them in the innermost loop.
ysr@777: bool
ysr@777: G1CollectorPolicy::predict_gc_eff(size_t young_length,
ysr@777:                                   size_t so_length,
ysr@777:                                   double base_time_with_so_ms,
ysr@777:                                   size_t init_free_regions,
ysr@777:                                   double target_pause_time_ms,
ysr@777:                                   double* ret_gc_eff) {
ysr@777:   *ret_gc_eff = 0.0;
ysr@777: 
ysr@777:   if (young_length >= init_free_regions)
ysr@777:     // end condition 1: not enough space for the young regions
ysr@777:     return false;
ysr@777: 
ysr@777:   double accum_surv_rate_adj = 0.0;
ysr@777:   if (so_length > 0)
ysr@777:     accum_surv_rate_adj = accum_yg_surv_rate_pred((int)(so_length - 1));
ysr@777:   double accum_surv_rate =
ysr@777:     accum_yg_surv_rate_pred((int)(young_length - 1)) - accum_surv_rate_adj;
ysr@777:   size_t bytes_to_copy =
ysr@777:     (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes);
ysr@777:   double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy);
ysr@777:   double young_other_time_ms =
ysr@777:                        predict_young_other_time_ms(young_length - so_length);
ysr@777:   double pause_time_ms =
ysr@777:                    base_time_with_so_ms + copy_time_ms + young_other_time_ms;
ysr@777: 
ysr@777:   if (pause_time_ms > target_pause_time_ms)
ysr@777:     // end condition 2: over the target pause time
ysr@777:     return false;
ysr@777: 
ysr@777:   size_t reclaimed_bytes =
ysr@777:     (young_length - so_length) * HeapRegion::GrainBytes - bytes_to_copy;
ysr@777:   size_t free_bytes =
ysr@777:                  (init_free_regions - young_length) * HeapRegion::GrainBytes;
ysr@777: 
ysr@777:   if ((2.0 + sigma()) * (double) bytes_to_copy > (double) free_bytes)
ysr@777:     // end condition 3: out of to-space (conservatively)
ysr@777:     return false;
ysr@777: 
ysr@777:   // success!
ysr@777:   double gc_eff = (double) reclaimed_bytes / pause_time_ms;
ysr@777:   *ret_gc_eff = gc_eff;
ysr@777: 
ysr@777:   return true;
ysr@777: }
ysr@777: 
apetrusenko@980: double G1CollectorPolicy::predict_survivor_regions_evac_time() {
apetrusenko@980:   double survivor_regions_evac_time = 0.0;
apetrusenko@980:   for (HeapRegion * r = _recorded_survivor_head;
apetrusenko@980:        r != NULL && r != _recorded_survivor_tail->get_next_young_region();
apetrusenko@980:        r = r->get_next_young_region()) {
apetrusenko@980:     survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true);
apetrusenko@980:   }
apetrusenko@980:   return survivor_regions_evac_time;
apetrusenko@980: }
apetrusenko@980: 
ysr@777: void G1CollectorPolicy::check_prediction_validity() {
ysr@777:   guarantee( adaptive_young_list_length(), "should not call this otherwise" );
ysr@777: 
ysr@777:   size_t rs_lengths = _g1->young_list_sampled_rs_lengths();
ysr@777:   if (rs_lengths > _rs_lengths_prediction) {
ysr@777:     // add 10% to avoid having to recalculate often
ysr@777:     size_t rs_lengths_prediction = rs_lengths * 1100 / 1000;
ysr@777:     calculate_young_list_target_config(rs_lengths_prediction);
ysr@777:   }
ysr@777: }
ysr@777: 
ysr@777: HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size,
ysr@777:                                                bool is_tlab,
ysr@777:                                                bool* gc_overhead_limit_was_exceeded) {
ysr@777:   guarantee(false, "Not using this policy feature yet.");
ysr@777:   return NULL;
ysr@777: }
ysr@777: 
ysr@777: // This method controls how a collector handles one or more
ysr@777: // of its generations being fully allocated.
ysr@777: HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size,
ysr@777:                                                        bool is_tlab) {
ysr@777:   guarantee(false, "Not using this policy feature yet.");
ysr@777:   return NULL;
ysr@777: }
ysr@777: 
ysr@777: 
ysr@777: #ifndef PRODUCT
ysr@777: bool G1CollectorPolicy::verify_young_ages() {
ysr@777:   HeapRegion* head = _g1->young_list_first_region();
ysr@777:   return
ysr@777:     verify_young_ages(head, _short_lived_surv_rate_group);
ysr@777:   // also call verify_young_ages on any additional surv rate groups
ysr@777: }
ysr@777: 
ysr@777: bool
ysr@777: G1CollectorPolicy::verify_young_ages(HeapRegion* head,
ysr@777:                                      SurvRateGroup *surv_rate_group) {
ysr@777:   guarantee( surv_rate_group != NULL, "pre-condition" );
ysr@777: 
ysr@777:   const char* name = surv_rate_group->name();
ysr@777:   bool ret = true;
ysr@777:   int prev_age = -1;
ysr@777: 
ysr@777:   for (HeapRegion* curr = head;
ysr@777:        curr != NULL;
ysr@777:        curr = curr->get_next_young_region()) {
ysr@777:     SurvRateGroup* group = curr->surv_rate_group();
ysr@777:     if (group == NULL && !curr->is_survivor()) {
ysr@777:       gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name);
ysr@777:       ret = false;
ysr@777:     }
ysr@777: 
ysr@777:     if (surv_rate_group == group) {
ysr@777:       int age = curr->age_in_surv_rate_group();
ysr@777: 
ysr@777:       if (age < 0) {
ysr@777:         gclog_or_tty->print_cr("## %s: encountered negative age", name);
ysr@777:         ret = false;
ysr@777:       }
ysr@777: 
ysr@777:       if (age <= prev_age) {
ysr@777:         gclog_or_tty->print_cr("## %s: region ages are not strictly increasing "
ysr@777:                                "(%d, %d)", name, age, prev_age);
ysr@777:         ret = false;
ysr@777:       }
ysr@777:       prev_age = age;
ysr@777:     }
ysr@777:   }
ysr@777: 
ysr@777:   return ret;
ysr@777: }
ysr@777: #endif // PRODUCT
ysr@777: 
ysr@777: void G1CollectorPolicy::record_full_collection_start() {
ysr@777:   _cur_collection_start_sec = os::elapsedTime();
ysr@777:   // Release the future to-space so that it is available for compaction into.
ysr@777:   _g1->set_full_collection();
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::record_full_collection_end() {
ysr@777:   // Consider this like a collection pause for the purposes of allocation
ysr@777:   // since last pause.
ysr@777:   double end_sec = os::elapsedTime();
ysr@777:   double full_gc_time_sec = end_sec - _cur_collection_start_sec;
ysr@777:   double full_gc_time_ms = full_gc_time_sec * 1000.0;
ysr@777: 
ysr@777:   checkpoint_conc_overhead();
ysr@777: 
ysr@777:   _all_full_gc_times_ms->add(full_gc_time_ms);
ysr@777: 
ysr@777:   update_recent_gc_times(end_sec, full_gc_time_sec);
ysr@777: 
ysr@777:   _g1->clear_full_collection();
ysr@777: 
ysr@777:   // "Nuke" the heuristics that control the fully/partially young GC
ysr@777:   // transitions and make sure we start with fully young GCs after the
ysr@777:   // Full GC.
ysr@777:   set_full_young_gcs(true);
ysr@777:   _last_full_young_gc = false;
ysr@777:   _should_revert_to_full_young_gcs = false;
ysr@777:   _should_initiate_conc_mark = false;
ysr@777:   _known_garbage_bytes = 0;
ysr@777:   _known_garbage_ratio = 0.0;
ysr@777:   _in_marking_window = false;
ysr@777:   _in_marking_window_im = false;
ysr@777: 
ysr@777:   _short_lived_surv_rate_group->record_scan_only_prefix(0);
ysr@777:   _short_lived_surv_rate_group->start_adding_regions();
ysr@777:   // also call this on any additional surv rate groups
ysr@777: 
apetrusenko@980:   record_survivor_regions(0, NULL, NULL);
apetrusenko@980: 
ysr@777:   _prev_region_num_young   = _region_num_young;
ysr@777:   _prev_region_num_tenured = _region_num_tenured;
ysr@777: 
ysr@777:   _free_regions_at_end_of_collection = _g1->free_regions();
ysr@777:   _scan_only_regions_at_end_of_collection = 0;
apetrusenko@980:   // Reset survivors SurvRateGroup.
apetrusenko@980:   _survivor_surv_rate_group->reset();
ysr@777:   calculate_young_list_min_length();
ysr@777:   calculate_young_list_target_config();
ysr@777:  }
ysr@777: 
ysr@777: void G1CollectorPolicy::record_pop_compute_rc_start() {
ysr@777:   _pop_compute_rc_start = os::elapsedTime();
ysr@777: }
ysr@777: void G1CollectorPolicy::record_pop_compute_rc_end() {
ysr@777:   double ms = (os::elapsedTime() - _pop_compute_rc_start)*1000.0;
ysr@777:   _cur_popular_compute_rc_time_ms = ms;
ysr@777:   _pop_compute_rc_start = 0.0;
ysr@777: }
ysr@777: void G1CollectorPolicy::record_pop_evac_start() {
ysr@777:   _pop_evac_start = os::elapsedTime();
ysr@777: }
ysr@777: void G1CollectorPolicy::record_pop_evac_end() {
ysr@777:   double ms = (os::elapsedTime() - _pop_evac_start)*1000.0;
ysr@777:   _cur_popular_evac_time_ms = ms;
ysr@777:   _pop_evac_start = 0.0;
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::record_before_bytes(size_t bytes) {
ysr@777:   _bytes_in_to_space_before_gc += bytes;
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::record_after_bytes(size_t bytes) {
ysr@777:   _bytes_in_to_space_after_gc += bytes;
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::record_stop_world_start() {
ysr@777:   _stop_world_start = os::elapsedTime();
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::record_collection_pause_start(double start_time_sec,
ysr@777:                                                       size_t start_used) {
ysr@777:   if (PrintGCDetails) {
ysr@777:     gclog_or_tty->stamp(PrintGCTimeStamps);
ysr@777:     gclog_or_tty->print("[GC pause");
ysr@777:     if (in_young_gc_mode())
ysr@777:       gclog_or_tty->print(" (%s)", full_young_gcs() ? "young" : "partial");
ysr@777:   }
ysr@777: 
ysr@777:   assert(_g1->used_regions() == _g1->recalculate_used_regions(),
ysr@777:          "sanity");
ysr@777: 
ysr@777:   double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0;
ysr@777:   _all_stop_world_times_ms->add(s_w_t_ms);
ysr@777:   _stop_world_start = 0.0;
ysr@777: 
ysr@777:   _cur_collection_start_sec = start_time_sec;
ysr@777:   _cur_collection_pause_used_at_start_bytes = start_used;
ysr@777:   _cur_collection_pause_used_regions_at_start = _g1->used_regions();
ysr@777:   _pending_cards = _g1->pending_card_num();
ysr@777:   _max_pending_cards = _g1->max_pending_card_num();
ysr@777: 
ysr@777:   _bytes_in_to_space_before_gc = 0;
ysr@777:   _bytes_in_to_space_after_gc = 0;
ysr@777:   _bytes_in_collection_set_before_gc = 0;
ysr@777: 
ysr@777: #ifdef DEBUG
ysr@777:   // initialise these to something well known so that we can spot
ysr@777:   // if they are not set properly
ysr@777: 
ysr@777:   for (int i = 0; i < _parallel_gc_threads; ++i) {
ysr@777:     _par_last_ext_root_scan_times_ms[i] = -666.0;
ysr@777:     _par_last_mark_stack_scan_times_ms[i] = -666.0;
ysr@777:     _par_last_scan_only_times_ms[i] = -666.0;
ysr@777:     _par_last_scan_only_regions_scanned[i] = -666.0;
ysr@777:     _par_last_update_rs_start_times_ms[i] = -666.0;
ysr@777:     _par_last_update_rs_times_ms[i] = -666.0;
ysr@777:     _par_last_update_rs_processed_buffers[i] = -666.0;
ysr@777:     _par_last_scan_rs_start_times_ms[i] = -666.0;
ysr@777:     _par_last_scan_rs_times_ms[i] = -666.0;
ysr@777:     _par_last_scan_new_refs_times_ms[i] = -666.0;
ysr@777:     _par_last_obj_copy_times_ms[i] = -666.0;
ysr@777:     _par_last_termination_times_ms[i] = -666.0;
ysr@777: 
ysr@777:     _pop_par_last_update_rs_start_times_ms[i] = -666.0;
ysr@777:     _pop_par_last_update_rs_times_ms[i] = -666.0;
ysr@777:     _pop_par_last_update_rs_processed_buffers[i] = -666.0;
ysr@777:     _pop_par_last_scan_rs_start_times_ms[i] = -666.0;
ysr@777:     _pop_par_last_scan_rs_times_ms[i] = -666.0;
ysr@777:     _pop_par_last_closure_app_times_ms[i] = -666.0;
ysr@777:   }
ysr@777: #endif
ysr@777: 
ysr@777:   for (int i = 0; i < _aux_num; ++i) {
ysr@777:     _cur_aux_times_ms[i] = 0.0;
ysr@777:     _cur_aux_times_set[i] = false;
ysr@777:   }
ysr@777: 
ysr@777:   _satb_drain_time_set = false;
ysr@777:   _last_satb_drain_processed_buffers = -1;
ysr@777: 
ysr@777:   if (in_young_gc_mode())
ysr@777:     _last_young_gc_full = false;
ysr@777: 
ysr@777: 
ysr@777:   // do that for any other surv rate groups
ysr@777:   _short_lived_surv_rate_group->stop_adding_regions();
ysr@777:   size_t short_lived_so_length = _young_list_so_prefix_length;
ysr@777:   _short_lived_surv_rate_group->record_scan_only_prefix(short_lived_so_length);
ysr@777:   tag_scan_only(short_lived_so_length);
ysr@777: 
apetrusenko@980:   if (G1UseSurvivorSpace) {
apetrusenko@980:     _survivors_age_table.clear();
apetrusenko@980:   }
apetrusenko@980: 
ysr@777:   assert( verify_young_ages(), "region age verification" );
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::tag_scan_only(size_t short_lived_scan_only_length) {
ysr@777:   // done in a way that it can be extended for other surv rate groups too...
ysr@777: 
ysr@777:   HeapRegion* head = _g1->young_list_first_region();
ysr@777:   bool finished_short_lived = (short_lived_scan_only_length == 0);
ysr@777: 
ysr@777:   if (finished_short_lived)
ysr@777:     return;
ysr@777: 
ysr@777:   for (HeapRegion* curr = head;
ysr@777:        curr != NULL;
ysr@777:        curr = curr->get_next_young_region()) {
ysr@777:     SurvRateGroup* surv_rate_group = curr->surv_rate_group();
ysr@777:     int age = curr->age_in_surv_rate_group();
ysr@777: 
ysr@777:     if (surv_rate_group == _short_lived_surv_rate_group) {
ysr@777:       if ((size_t)age < short_lived_scan_only_length)
ysr@777:         curr->set_scan_only();
ysr@777:       else
ysr@777:         finished_short_lived = true;
ysr@777:     }
ysr@777: 
ysr@777: 
ysr@777:     if (finished_short_lived)
ysr@777:       return;
ysr@777:   }
ysr@777: 
ysr@777:   guarantee( false, "we should never reach here" );
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::record_popular_pause_preamble_start() {
ysr@777:   _cur_popular_preamble_start_ms = os::elapsedTime() * 1000.0;
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::record_popular_pause_preamble_end() {
ysr@777:   _cur_popular_preamble_time_ms =
ysr@777:     (os::elapsedTime() * 1000.0) - _cur_popular_preamble_start_ms;
ysr@777: 
ysr@777:   // copy the recorded statistics of the first pass to temporary arrays
ysr@777:   for (int i = 0; i < _parallel_gc_threads; ++i) {
ysr@777:     _pop_par_last_update_rs_start_times_ms[i] = _par_last_update_rs_start_times_ms[i];
ysr@777:     _pop_par_last_update_rs_times_ms[i] = _par_last_update_rs_times_ms[i];
ysr@777:     _pop_par_last_update_rs_processed_buffers[i] = _par_last_update_rs_processed_buffers[i];
ysr@777:     _pop_par_last_scan_rs_start_times_ms[i] = _par_last_scan_rs_start_times_ms[i];
ysr@777:     _pop_par_last_scan_rs_times_ms[i] = _par_last_scan_rs_times_ms[i];
ysr@777:     _pop_par_last_closure_app_times_ms[i] = _par_last_obj_copy_times_ms[i];
ysr@777:   }
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::record_mark_closure_time(double mark_closure_time_ms) {
ysr@777:   _mark_closure_time_ms = mark_closure_time_ms;
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::record_concurrent_mark_init_start() {
ysr@777:   _mark_init_start_sec = os::elapsedTime();
ysr@777:   guarantee(!in_young_gc_mode(), "should not do be here in young GC mode");
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::record_concurrent_mark_init_end_pre(double
ysr@777:                                                    mark_init_elapsed_time_ms) {
ysr@777:   _during_marking = true;
ysr@777:   _should_initiate_conc_mark = false;
ysr@777:   _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms;
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::record_concurrent_mark_init_end() {
ysr@777:   double end_time_sec = os::elapsedTime();
ysr@777:   double elapsed_time_ms = (end_time_sec - _mark_init_start_sec) * 1000.0;
ysr@777:   _concurrent_mark_init_times_ms->add(elapsed_time_ms);
ysr@777:   checkpoint_conc_overhead();
ysr@777:   record_concurrent_mark_init_end_pre(elapsed_time_ms);
ysr@777: 
ysr@777:   _mmu_tracker->add_pause(_mark_init_start_sec, end_time_sec, true);
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::record_concurrent_mark_remark_start() {
ysr@777:   _mark_remark_start_sec = os::elapsedTime();
ysr@777:   _during_marking = false;
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::record_concurrent_mark_remark_end() {
ysr@777:   double end_time_sec = os::elapsedTime();
ysr@777:   double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0;
ysr@777:   checkpoint_conc_overhead();
ysr@777:   _concurrent_mark_remark_times_ms->add(elapsed_time_ms);
ysr@777:   _cur_mark_stop_world_time_ms += elapsed_time_ms;
ysr@777:   _prev_collection_pause_end_ms += elapsed_time_ms;
ysr@777: 
ysr@777:   _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true);
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::record_concurrent_mark_cleanup_start() {
ysr@777:   _mark_cleanup_start_sec = os::elapsedTime();
ysr@777: }
ysr@777: 
ysr@777: void
ysr@777: G1CollectorPolicy::record_concurrent_mark_cleanup_end(size_t freed_bytes,
ysr@777:                                                       size_t max_live_bytes) {
ysr@777:   record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes);
ysr@777:   record_concurrent_mark_cleanup_end_work2();
ysr@777: }
ysr@777: 
ysr@777: void
ysr@777: G1CollectorPolicy::
ysr@777: record_concurrent_mark_cleanup_end_work1(size_t freed_bytes,
ysr@777:                                          size_t max_live_bytes) {
ysr@777:   if (_n_marks < 2) _n_marks++;
ysr@777:   if (G1PolicyVerbose > 0)
ysr@777:     gclog_or_tty->print_cr("At end of marking, max_live is " SIZE_FORMAT " MB "
ysr@777:                            " (of " SIZE_FORMAT " MB heap).",
ysr@777:                            max_live_bytes/M, _g1->capacity()/M);
ysr@777: }
ysr@777: 
ysr@777: // The important thing about this is that it includes "os::elapsedTime".
ysr@777: void G1CollectorPolicy::record_concurrent_mark_cleanup_end_work2() {
ysr@777:   checkpoint_conc_overhead();
ysr@777:   double end_time_sec = os::elapsedTime();
ysr@777:   double elapsed_time_ms = (end_time_sec - _mark_cleanup_start_sec)*1000.0;
ysr@777:   _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms);
ysr@777:   _cur_mark_stop_world_time_ms += elapsed_time_ms;
ysr@777:   _prev_collection_pause_end_ms += elapsed_time_ms;
ysr@777: 
ysr@777:   _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_time_sec, true);
ysr@777: 
ysr@777:   _num_markings++;
ysr@777: 
ysr@777:   // We did a marking, so reset the "since_last_mark" variables.
ysr@777:   double considerConcMarkCost = 1.0;
ysr@777:   // If there are available processors, concurrent activity is free...
ysr@777:   if (Threads::number_of_non_daemon_threads() * 2 <
ysr@777:       os::active_processor_count()) {
ysr@777:     considerConcMarkCost = 0.0;
ysr@777:   }
ysr@777:   _n_pauses_at_mark_end = _n_pauses;
ysr@777:   _n_marks_since_last_pause++;
ysr@777:   _conc_mark_initiated = false;
ysr@777: }
ysr@777: 
ysr@777: void
ysr@777: G1CollectorPolicy::record_concurrent_mark_cleanup_completed() {
ysr@777:   if (in_young_gc_mode()) {
ysr@777:     _should_revert_to_full_young_gcs = false;
ysr@777:     _last_full_young_gc = true;
ysr@777:     _in_marking_window = false;
ysr@777:     if (adaptive_young_list_length())
ysr@777:       calculate_young_list_target_config();
ysr@777:   }
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::record_concurrent_pause() {
ysr@777:   if (_stop_world_start > 0.0) {
ysr@777:     double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0;
ysr@777:     _all_yield_times_ms->add(yield_ms);
ysr@777:   }
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::record_concurrent_pause_end() {
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::record_collection_pause_end_CH_strong_roots() {
ysr@777:   _cur_CH_strong_roots_end_sec = os::elapsedTime();
ysr@777:   _cur_CH_strong_roots_dur_ms =
ysr@777:     (_cur_CH_strong_roots_end_sec - _cur_collection_start_sec) * 1000.0;
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::record_collection_pause_end_G1_strong_roots() {
ysr@777:   _cur_G1_strong_roots_end_sec = os::elapsedTime();
ysr@777:   _cur_G1_strong_roots_dur_ms =
ysr@777:     (_cur_G1_strong_roots_end_sec - _cur_CH_strong_roots_end_sec) * 1000.0;
ysr@777: }
ysr@777: 
ysr@777: template<class T>
ysr@777: T sum_of(T* sum_arr, int start, int n, int N) {
ysr@777:   T sum = (T)0;
ysr@777:   for (int i = 0; i < n; i++) {
ysr@777:     int j = (start + i) % N;
ysr@777:     sum += sum_arr[j];
ysr@777:   }
ysr@777:   return sum;
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::print_par_stats (int level,
ysr@777:                                          const char* str,
ysr@777:                                          double* data,
ysr@777:                                          bool summary) {
ysr@777:   double min = data[0], max = data[0];
ysr@777:   double total = 0.0;
ysr@777:   int j;
ysr@777:   for (j = 0; j < level; ++j)
ysr@777:     gclog_or_tty->print("   ");
ysr@777:   gclog_or_tty->print("[%s (ms):", str);
ysr@777:   for (uint i = 0; i < ParallelGCThreads; ++i) {
ysr@777:     double val = data[i];
ysr@777:     if (val < min)
ysr@777:       min = val;
ysr@777:     if (val > max)
ysr@777:       max = val;
ysr@777:     total += val;
ysr@777:     gclog_or_tty->print("  %3.1lf", val);
ysr@777:   }
ysr@777:   if (summary) {
ysr@777:     gclog_or_tty->print_cr("");
ysr@777:     double avg = total / (double) ParallelGCThreads;
ysr@777:     gclog_or_tty->print(" ");
ysr@777:     for (j = 0; j < level; ++j)
ysr@777:       gclog_or_tty->print("   ");
ysr@777:     gclog_or_tty->print("Avg: %5.1lf, Min: %5.1lf, Max: %5.1lf",
ysr@777:                         avg, min, max);
ysr@777:   }
ysr@777:   gclog_or_tty->print_cr("]");
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::print_par_buffers (int level,
ysr@777:                                          const char* str,
ysr@777:                                          double* data,
ysr@777:                                          bool summary) {
ysr@777:   double min = data[0], max = data[0];
ysr@777:   double total = 0.0;
ysr@777:   int j;
ysr@777:   for (j = 0; j < level; ++j)
ysr@777:     gclog_or_tty->print("   ");
ysr@777:   gclog_or_tty->print("[%s :", str);
ysr@777:   for (uint i = 0; i < ParallelGCThreads; ++i) {
ysr@777:     double val = data[i];
ysr@777:     if (val < min)
ysr@777:       min = val;
ysr@777:     if (val > max)
ysr@777:       max = val;
ysr@777:     total += val;
ysr@777:     gclog_or_tty->print(" %d", (int) val);
ysr@777:   }
ysr@777:   if (summary) {
ysr@777:     gclog_or_tty->print_cr("");
ysr@777:     double avg = total / (double) ParallelGCThreads;
ysr@777:     gclog_or_tty->print(" ");
ysr@777:     for (j = 0; j < level; ++j)
ysr@777:       gclog_or_tty->print("   ");
ysr@777:     gclog_or_tty->print("Sum: %d, Avg: %d, Min: %d, Max: %d",
ysr@777:                (int)total, (int)avg, (int)min, (int)max);
ysr@777:   }
ysr@777:   gclog_or_tty->print_cr("]");
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::print_stats (int level,
ysr@777:                                      const char* str,
ysr@777:                                      double value) {
ysr@777:   for (int j = 0; j < level; ++j)
ysr@777:     gclog_or_tty->print("   ");
ysr@777:   gclog_or_tty->print_cr("[%s: %5.1lf ms]", str, value);
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::print_stats (int level,
ysr@777:                                      const char* str,
ysr@777:                                      int value) {
ysr@777:   for (int j = 0; j < level; ++j)
ysr@777:     gclog_or_tty->print("   ");
ysr@777:   gclog_or_tty->print_cr("[%s: %d]", str, value);
ysr@777: }
ysr@777: 
ysr@777: double G1CollectorPolicy::avg_value (double* data) {
ysr@777:   if (ParallelGCThreads > 0) {
ysr@777:     double ret = 0.0;
ysr@777:     for (uint i = 0; i < ParallelGCThreads; ++i)
ysr@777:       ret += data[i];
ysr@777:     return ret / (double) ParallelGCThreads;
ysr@777:   } else {
ysr@777:     return data[0];
ysr@777:   }
ysr@777: }
ysr@777: 
ysr@777: double G1CollectorPolicy::max_value (double* data) {
ysr@777:   if (ParallelGCThreads > 0) {
ysr@777:     double ret = data[0];
ysr@777:     for (uint i = 1; i < ParallelGCThreads; ++i)
ysr@777:       if (data[i] > ret)
ysr@777:         ret = data[i];
ysr@777:     return ret;
ysr@777:   } else {
ysr@777:     return data[0];
ysr@777:   }
ysr@777: }
ysr@777: 
ysr@777: double G1CollectorPolicy::sum_of_values (double* data) {
ysr@777:   if (ParallelGCThreads > 0) {
ysr@777:     double sum = 0.0;
ysr@777:     for (uint i = 0; i < ParallelGCThreads; i++)
ysr@777:       sum += data[i];
ysr@777:     return sum;
ysr@777:   } else {
ysr@777:     return data[0];
ysr@777:   }
ysr@777: }
ysr@777: 
ysr@777: double G1CollectorPolicy::max_sum (double* data1,
ysr@777:                                    double* data2) {
ysr@777:   double ret = data1[0] + data2[0];
ysr@777: 
ysr@777:   if (ParallelGCThreads > 0) {
ysr@777:     for (uint i = 1; i < ParallelGCThreads; ++i) {
ysr@777:       double data = data1[i] + data2[i];
ysr@777:       if (data > ret)
ysr@777:         ret = data;
ysr@777:     }
ysr@777:   }
ysr@777:   return ret;
ysr@777: }
ysr@777: 
ysr@777: // Anything below that is considered to be zero
ysr@777: #define MIN_TIMER_GRANULARITY 0.0000001
ysr@777: 
ysr@777: void G1CollectorPolicy::record_collection_pause_end(bool popular,
ysr@777:                                                     bool abandoned) {
ysr@777:   double end_time_sec = os::elapsedTime();
ysr@777:   double elapsed_ms = _last_pause_time_ms;
ysr@777:   bool parallel = ParallelGCThreads > 0;
ysr@777:   double evac_ms = (end_time_sec - _cur_G1_strong_roots_end_sec) * 1000.0;
ysr@777:   size_t rs_size =
ysr@777:     _cur_collection_pause_used_regions_at_start - collection_set_size();
ysr@777:   size_t cur_used_bytes = _g1->used();
ysr@777:   assert(cur_used_bytes == _g1->recalculate_used(), "It should!");
ysr@777:   bool last_pause_included_initial_mark = false;
ysr@777: 
ysr@777: #ifndef PRODUCT
ysr@777:   if (G1YoungSurvRateVerbose) {
ysr@777:     gclog_or_tty->print_cr("");
ysr@777:     _short_lived_surv_rate_group->print();
ysr@777:     // do that for any other surv rate groups too
ysr@777:   }
ysr@777: #endif // PRODUCT
ysr@777: 
ysr@777:   checkpoint_conc_overhead();
ysr@777: 
ysr@777:   if (in_young_gc_mode()) {
ysr@777:     last_pause_included_initial_mark = _should_initiate_conc_mark;
ysr@777:     if (last_pause_included_initial_mark)
ysr@777:       record_concurrent_mark_init_end_pre(0.0);
ysr@777: 
ysr@777:     size_t min_used_targ =
ysr@777:       (_g1->capacity() / 100) * (G1SteadyStateUsed - G1SteadyStateUsedDelta);
ysr@777: 
ysr@777:     if (cur_used_bytes > min_used_targ) {
ysr@777:       if (cur_used_bytes <= _prev_collection_pause_used_at_end_bytes) {
ysr@777:       } else if (!_g1->mark_in_progress() && !_last_full_young_gc) {
ysr@777:         _should_initiate_conc_mark = true;
ysr@777:       }
ysr@777:     }
ysr@777: 
ysr@777:     _prev_collection_pause_used_at_end_bytes = cur_used_bytes;
ysr@777:   }
ysr@777: 
ysr@777:   _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0,
ysr@777:                           end_time_sec, false);
ysr@777: 
ysr@777:   guarantee(_cur_collection_pause_used_regions_at_start >=
ysr@777:             collection_set_size(),
ysr@777:             "Negative RS size?");
ysr@777: 
ysr@777:   // This assert is exempted when we're doing parallel collection pauses,
ysr@777:   // because the fragmentation caused by the parallel GC allocation buffers
ysr@777:   // can lead to more memory being used during collection than was used
ysr@777:   // before. Best leave this out until the fragmentation problem is fixed.
ysr@777:   // Pauses in which evacuation failed can also lead to negative
ysr@777:   // collections, since no space is reclaimed from a region containing an
ysr@777:   // object whose evacuation failed.
ysr@777:   // Further, we're now always doing parallel collection.  But I'm still
ysr@777:   // leaving this here as a placeholder for a more precise assertion later.
ysr@777:   // (DLD, 10/05.)
ysr@777:   assert((true || parallel) // Always using GC LABs now.
ysr@777:          || _g1->evacuation_failed()
ysr@777:          || _cur_collection_pause_used_at_start_bytes >= cur_used_bytes,
ysr@777:          "Negative collection");
ysr@777: 
ysr@777:   size_t freed_bytes =
ysr@777:     _cur_collection_pause_used_at_start_bytes - cur_used_bytes;
ysr@777:   size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes;
ysr@777:   double survival_fraction =
ysr@777:     (double)surviving_bytes/
ysr@777:     (double)_collection_set_bytes_used_before;
ysr@777: 
ysr@777:   _n_pauses++;
ysr@777: 
ysr@777:   if (!abandoned) {
ysr@777:     _recent_CH_strong_roots_times_ms->add(_cur_CH_strong_roots_dur_ms);
ysr@777:     _recent_G1_strong_roots_times_ms->add(_cur_G1_strong_roots_dur_ms);
ysr@777:     _recent_evac_times_ms->add(evac_ms);
ysr@777:     _recent_pause_times_ms->add(elapsed_ms);
ysr@777: 
ysr@777:     _recent_rs_sizes->add(rs_size);
ysr@777: 
ysr@777:     // We exempt parallel collection from this check because Alloc Buffer
ysr@777:     // fragmentation can produce negative collections.  Same with evac
ysr@777:     // failure.
ysr@777:     // Further, we're now always doing parallel collection.  But I'm still
ysr@777:     // leaving this here as a placeholder for a more precise assertion later.
ysr@777:     // (DLD, 10/05.
ysr@777:     assert((true || parallel)
ysr@777:            || _g1->evacuation_failed()
ysr@777:            || surviving_bytes <= _collection_set_bytes_used_before,
ysr@777:            "Or else negative collection!");
ysr@777:     _recent_CS_bytes_used_before->add(_collection_set_bytes_used_before);
ysr@777:     _recent_CS_bytes_surviving->add(surviving_bytes);
ysr@777: 
ysr@777:     // this is where we update the allocation rate of the application
ysr@777:     double app_time_ms =
ysr@777:       (_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms);
ysr@777:     if (app_time_ms < MIN_TIMER_GRANULARITY) {
ysr@777:       // This usually happens due to the timer not having the required
ysr@777:       // granularity. Some Linuxes are the usual culprits.
ysr@777:       // We'll just set it to something (arbitrarily) small.
ysr@777:       app_time_ms = 1.0;
ysr@777:     }
ysr@777:     size_t regions_allocated =
ysr@777:       (_region_num_young - _prev_region_num_young) +
ysr@777:       (_region_num_tenured - _prev_region_num_tenured);
ysr@777:     double alloc_rate_ms = (double) regions_allocated / app_time_ms;
ysr@777:     _alloc_rate_ms_seq->add(alloc_rate_ms);
ysr@777:     _prev_region_num_young   = _region_num_young;
ysr@777:     _prev_region_num_tenured = _region_num_tenured;
ysr@777: 
ysr@777:     double interval_ms =
ysr@777:       (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0;
ysr@777:     update_recent_gc_times(end_time_sec, elapsed_ms);
ysr@777:     _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms;
ysr@777:     assert(recent_avg_pause_time_ratio() < 1.00, "All GC?");
ysr@777:   }
ysr@777: 
ysr@777:   if (G1PolicyVerbose > 1) {
ysr@777:     gclog_or_tty->print_cr("   Recording collection pause(%d)", _n_pauses);
ysr@777:   }
ysr@777: 
ysr@777:   PauseSummary* summary;
ysr@777:   if (!abandoned && !popular)
ysr@777:     summary = _non_pop_summary;
ysr@777:   else if (!abandoned && popular)
ysr@777:     summary = _pop_summary;
ysr@777:   else if (abandoned && !popular)
ysr@777:     summary = _non_pop_abandoned_summary;
ysr@777:   else if (abandoned && popular)
ysr@777:     summary = _pop_abandoned_summary;
ysr@777:   else
ysr@777:     guarantee(false, "should not get here!");
ysr@777: 
ysr@777:   double pop_update_rs_time;
ysr@777:   double pop_update_rs_processed_buffers;
ysr@777:   double pop_scan_rs_time;
ysr@777:   double pop_closure_app_time;
ysr@777:   double pop_other_time;
ysr@777: 
ysr@777:   if (popular) {
ysr@777:     PopPreambleSummary* preamble_summary = summary->pop_preamble_summary();
ysr@777:     guarantee(preamble_summary != NULL, "should not be null!");
ysr@777: 
ysr@777:     pop_update_rs_time = avg_value(_pop_par_last_update_rs_times_ms);
ysr@777:     pop_update_rs_processed_buffers =
ysr@777:       sum_of_values(_pop_par_last_update_rs_processed_buffers);
ysr@777:     pop_scan_rs_time = avg_value(_pop_par_last_scan_rs_times_ms);
ysr@777:     pop_closure_app_time = avg_value(_pop_par_last_closure_app_times_ms);
ysr@777:     pop_other_time = _cur_popular_preamble_time_ms -
ysr@777:       (pop_update_rs_time + pop_scan_rs_time + pop_closure_app_time +
ysr@777:        _cur_popular_evac_time_ms);
ysr@777: 
ysr@777:     preamble_summary->record_pop_preamble_time_ms(_cur_popular_preamble_time_ms);
ysr@777:     preamble_summary->record_pop_update_rs_time_ms(pop_update_rs_time);
ysr@777:     preamble_summary->record_pop_scan_rs_time_ms(pop_scan_rs_time);
ysr@777:     preamble_summary->record_pop_closure_app_time_ms(pop_closure_app_time);
ysr@777:     preamble_summary->record_pop_evacuation_time_ms(_cur_popular_evac_time_ms);
ysr@777:     preamble_summary->record_pop_other_time_ms(pop_other_time);
ysr@777:   }
ysr@777: 
ysr@777:   double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms);
ysr@777:   double mark_stack_scan_time = avg_value(_par_last_mark_stack_scan_times_ms);
ysr@777:   double scan_only_time = avg_value(_par_last_scan_only_times_ms);
ysr@777:   double scan_only_regions_scanned =
ysr@777:     sum_of_values(_par_last_scan_only_regions_scanned);
ysr@777:   double update_rs_time = avg_value(_par_last_update_rs_times_ms);
ysr@777:   double update_rs_processed_buffers =
ysr@777:     sum_of_values(_par_last_update_rs_processed_buffers);
ysr@777:   double scan_rs_time = avg_value(_par_last_scan_rs_times_ms);
ysr@777:   double obj_copy_time = avg_value(_par_last_obj_copy_times_ms);
ysr@777:   double termination_time = avg_value(_par_last_termination_times_ms);
ysr@777: 
ysr@777:   double parallel_other_time;
ysr@777:   if (!abandoned) {
ysr@777:     MainBodySummary* body_summary = summary->main_body_summary();
ysr@777:     guarantee(body_summary != NULL, "should not be null!");
ysr@777: 
ysr@777:     if (_satb_drain_time_set)
ysr@777:       body_summary->record_satb_drain_time_ms(_cur_satb_drain_time_ms);
ysr@777:     else
ysr@777:       body_summary->record_satb_drain_time_ms(0.0);
ysr@777:     body_summary->record_ext_root_scan_time_ms(ext_root_scan_time);
ysr@777:     body_summary->record_mark_stack_scan_time_ms(mark_stack_scan_time);
ysr@777:     body_summary->record_scan_only_time_ms(scan_only_time);
ysr@777:     body_summary->record_update_rs_time_ms(update_rs_time);
ysr@777:     body_summary->record_scan_rs_time_ms(scan_rs_time);
ysr@777:     body_summary->record_obj_copy_time_ms(obj_copy_time);
ysr@777:     if (parallel) {
ysr@777:       body_summary->record_parallel_time_ms(_cur_collection_par_time_ms);
ysr@777:       body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms);
ysr@777:       body_summary->record_termination_time_ms(termination_time);
ysr@777:       parallel_other_time = _cur_collection_par_time_ms -
ysr@777:         (update_rs_time + ext_root_scan_time + mark_stack_scan_time +
ysr@777:          scan_only_time + scan_rs_time + obj_copy_time + termination_time);
ysr@777:       body_summary->record_parallel_other_time_ms(parallel_other_time);
ysr@777:     }
ysr@777:     body_summary->record_mark_closure_time_ms(_mark_closure_time_ms);
ysr@777:   }
ysr@777: 
ysr@777:   if (G1PolicyVerbose > 1) {
ysr@777:     gclog_or_tty->print_cr("      ET: %10.6f ms           (avg: %10.6f ms)\n"
ysr@777:                            "        CH Strong: %10.6f ms    (avg: %10.6f ms)\n"
ysr@777:                            "        G1 Strong: %10.6f ms    (avg: %10.6f ms)\n"
ysr@777:                            "        Evac:      %10.6f ms    (avg: %10.6f ms)\n"
ysr@777:                            "       ET-RS:  %10.6f ms      (avg: %10.6f ms)\n"
ysr@777:                            "      |RS|: " SIZE_FORMAT,
ysr@777:                            elapsed_ms, recent_avg_time_for_pauses_ms(),
ysr@777:                            _cur_CH_strong_roots_dur_ms, recent_avg_time_for_CH_strong_ms(),
ysr@777:                            _cur_G1_strong_roots_dur_ms, recent_avg_time_for_G1_strong_ms(),
ysr@777:                            evac_ms, recent_avg_time_for_evac_ms(),
ysr@777:                            scan_rs_time,
ysr@777:                            recent_avg_time_for_pauses_ms() -
ysr@777:                            recent_avg_time_for_G1_strong_ms(),
ysr@777:                            rs_size);
ysr@777: 
ysr@777:     gclog_or_tty->print_cr("       Used at start: " SIZE_FORMAT"K"
ysr@777:                            "       At end " SIZE_FORMAT "K\n"
ysr@777:                            "       garbage      : " SIZE_FORMAT "K"
ysr@777:                            "       of     " SIZE_FORMAT "K\n"
ysr@777:                            "       survival     : %6.2f%%  (%6.2f%% avg)",
ysr@777:                            _cur_collection_pause_used_at_start_bytes/K,
ysr@777:                            _g1->used()/K, freed_bytes/K,
ysr@777:                            _collection_set_bytes_used_before/K,
ysr@777:                            survival_fraction*100.0,
ysr@777:                            recent_avg_survival_fraction()*100.0);
ysr@777:     gclog_or_tty->print_cr("       Recent %% gc pause time: %6.2f",
ysr@777:                            recent_avg_pause_time_ratio() * 100.0);
ysr@777:   }
ysr@777: 
ysr@777:   double other_time_ms = elapsed_ms;
ysr@777:   if (popular)
ysr@777:     other_time_ms -= _cur_popular_preamble_time_ms;
ysr@777: 
ysr@777:   if (!abandoned) {
ysr@777:     if (_satb_drain_time_set)
ysr@777:       other_time_ms -= _cur_satb_drain_time_ms;
ysr@777: 
ysr@777:     if (parallel)
ysr@777:       other_time_ms -= _cur_collection_par_time_ms + _cur_clear_ct_time_ms;
ysr@777:     else
ysr@777:       other_time_ms -=
ysr@777:         update_rs_time +
ysr@777:         ext_root_scan_time + mark_stack_scan_time + scan_only_time +
ysr@777:         scan_rs_time + obj_copy_time;
ysr@777:   }
ysr@777: 
ysr@777:   if (PrintGCDetails) {
ysr@777:     gclog_or_tty->print_cr("%s%s, %1.8lf secs]",
ysr@777:                            (popular && !abandoned) ? " (popular)" :
ysr@777:                            (!popular && abandoned) ? " (abandoned)" :
ysr@777:                            (popular && abandoned) ? " (popular/abandoned)" : "",
ysr@777:                            (last_pause_included_initial_mark) ? " (initial-mark)" : "",
ysr@777:                            elapsed_ms / 1000.0);
ysr@777: 
ysr@777:     if (!abandoned) {
ysr@777:       if (_satb_drain_time_set)
ysr@777:         print_stats(1, "SATB Drain Time", _cur_satb_drain_time_ms);
ysr@777:       if (_last_satb_drain_processed_buffers >= 0)
ysr@777:         print_stats(2, "Processed Buffers", _last_satb_drain_processed_buffers);
ysr@777:     }
ysr@777:     if (popular)
ysr@777:       print_stats(1, "Popularity Preamble", _cur_popular_preamble_time_ms);
ysr@777:     if (parallel) {
ysr@777:       if (popular) {
ysr@777:         print_par_stats(2, "Update RS (Start)", _pop_par_last_update_rs_start_times_ms, false);
ysr@777:         print_par_stats(2, "Update RS", _pop_par_last_update_rs_times_ms);
ysr@777:         if (G1RSBarrierUseQueue)
ysr@777:           print_par_buffers(3, "Processed Buffers",
ysr@777:                             _pop_par_last_update_rs_processed_buffers, true);
ysr@777:         print_par_stats(2, "Scan RS", _pop_par_last_scan_rs_times_ms);
ysr@777:         print_par_stats(2, "Closure app", _pop_par_last_closure_app_times_ms);
ysr@777:         print_stats(2, "Evacuation", _cur_popular_evac_time_ms);
ysr@777:         print_stats(2, "Other", pop_other_time);
ysr@777:       }
ysr@777:       if (!abandoned) {
ysr@777:         print_stats(1, "Parallel Time", _cur_collection_par_time_ms);
ysr@777:         if (!popular) {
ysr@777:           print_par_stats(2, "Update RS (Start)", _par_last_update_rs_start_times_ms, false);
ysr@777:           print_par_stats(2, "Update RS", _par_last_update_rs_times_ms);
ysr@777:           if (G1RSBarrierUseQueue)
ysr@777:             print_par_buffers(3, "Processed Buffers",
ysr@777:                               _par_last_update_rs_processed_buffers, true);
ysr@777:         }
ysr@777:         print_par_stats(2, "Ext Root Scanning", _par_last_ext_root_scan_times_ms);
ysr@777:         print_par_stats(2, "Mark Stack Scanning", _par_last_mark_stack_scan_times_ms);
ysr@777:         print_par_stats(2, "Scan-Only Scanning", _par_last_scan_only_times_ms);
ysr@777:         print_par_buffers(3, "Scan-Only Regions",
ysr@777:                           _par_last_scan_only_regions_scanned, true);
ysr@777:         print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms);
ysr@777:         print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms);
ysr@777:         print_par_stats(2, "Termination", _par_last_termination_times_ms);
ysr@777:         print_stats(2, "Other", parallel_other_time);
ysr@777:         print_stats(1, "Clear CT", _cur_clear_ct_time_ms);
ysr@777:       }
ysr@777:     } else {
ysr@777:       if (popular) {
ysr@777:         print_stats(2, "Update RS", pop_update_rs_time);
ysr@777:         if (G1RSBarrierUseQueue)
ysr@777:           print_stats(3, "Processed Buffers",
ysr@777:                       (int)pop_update_rs_processed_buffers);
ysr@777:         print_stats(2, "Scan RS", pop_scan_rs_time);
ysr@777:         print_stats(2, "Closure App", pop_closure_app_time);
ysr@777:         print_stats(2, "Evacuation", _cur_popular_evac_time_ms);
ysr@777:         print_stats(2, "Other", pop_other_time);
ysr@777:       }
ysr@777:       if (!abandoned) {
ysr@777:         if (!popular) {
ysr@777:           print_stats(1, "Update RS", update_rs_time);
ysr@777:           if (G1RSBarrierUseQueue)
ysr@777:             print_stats(2, "Processed Buffers",
ysr@777:                         (int)update_rs_processed_buffers);
ysr@777:         }
ysr@777:         print_stats(1, "Ext Root Scanning", ext_root_scan_time);
ysr@777:         print_stats(1, "Mark Stack Scanning", mark_stack_scan_time);
ysr@777:         print_stats(1, "Scan-Only Scanning", scan_only_time);
ysr@777:         print_stats(1, "Scan RS", scan_rs_time);
ysr@777:         print_stats(1, "Object Copying", obj_copy_time);
ysr@777:       }
ysr@777:     }
ysr@777:     print_stats(1, "Other", other_time_ms);
ysr@777:     for (int i = 0; i < _aux_num; ++i) {
ysr@777:       if (_cur_aux_times_set[i]) {
ysr@777:         char buffer[96];
ysr@777:         sprintf(buffer, "Aux%d", i);
ysr@777:         print_stats(1, buffer, _cur_aux_times_ms[i]);
ysr@777:       }
ysr@777:     }
ysr@777:   }
ysr@777:   if (PrintGCDetails)
ysr@777:     gclog_or_tty->print("   [");
ysr@777:   if (PrintGC || PrintGCDetails)
ysr@777:     _g1->print_size_transition(gclog_or_tty,
ysr@777:                                _cur_collection_pause_used_at_start_bytes,
ysr@777:                                _g1->used(), _g1->capacity());
ysr@777:   if (PrintGCDetails)
ysr@777:     gclog_or_tty->print_cr("]");
ysr@777: 
ysr@777:   _all_pause_times_ms->add(elapsed_ms);
ysr@777:   summary->record_total_time_ms(elapsed_ms);
ysr@777:   summary->record_other_time_ms(other_time_ms);
ysr@777:   for (int i = 0; i < _aux_num; ++i)
ysr@777:     if (_cur_aux_times_set[i])
ysr@777:       _all_aux_times_ms[i].add(_cur_aux_times_ms[i]);
ysr@777: 
ysr@777:   // Reset marks-between-pauses counter.
ysr@777:   _n_marks_since_last_pause = 0;
ysr@777: 
ysr@777:   // Update the efficiency-since-mark vars.
ysr@777:   double proc_ms = elapsed_ms * (double) _parallel_gc_threads;
ysr@777:   if (elapsed_ms < MIN_TIMER_GRANULARITY) {
ysr@777:     // This usually happens due to the timer not having the required
ysr@777:     // granularity. Some Linuxes are the usual culprits.
ysr@777:     // We'll just set it to something (arbitrarily) small.
ysr@777:     proc_ms = 1.0;
ysr@777:   }
ysr@777:   double cur_efficiency = (double) freed_bytes / proc_ms;
ysr@777: 
ysr@777:   bool new_in_marking_window = _in_marking_window;
ysr@777:   bool new_in_marking_window_im = false;
ysr@777:   if (_should_initiate_conc_mark) {
ysr@777:     new_in_marking_window = true;
ysr@777:     new_in_marking_window_im = true;
ysr@777:   }
ysr@777: 
ysr@777:   if (in_young_gc_mode()) {
ysr@777:     if (_last_full_young_gc) {
ysr@777:       set_full_young_gcs(false);
ysr@777:       _last_full_young_gc = false;
ysr@777:     }
ysr@777: 
ysr@777:     if ( !_last_young_gc_full ) {
ysr@777:       if ( _should_revert_to_full_young_gcs ||
ysr@777:            _known_garbage_ratio < 0.05 ||
ysr@777:            (adaptive_young_list_length() &&
ysr@777:            (get_gc_eff_factor() * cur_efficiency < predict_young_gc_eff())) ) {
ysr@777:         set_full_young_gcs(true);
ysr@777:       }
ysr@777:     }
ysr@777:     _should_revert_to_full_young_gcs = false;
ysr@777: 
ysr@777:     if (_last_young_gc_full && !_during_marking)
ysr@777:       _young_gc_eff_seq->add(cur_efficiency);
ysr@777:   }
ysr@777: 
ysr@777:   _short_lived_surv_rate_group->start_adding_regions();
ysr@777:   // do that for any other surv rate groupsx
ysr@777: 
ysr@777:   // <NEW PREDICTION>
ysr@777: 
ysr@777:   if (!popular && !abandoned) {
ysr@777:     double pause_time_ms = elapsed_ms;
ysr@777: 
ysr@777:     size_t diff = 0;
ysr@777:     if (_max_pending_cards >= _pending_cards)
ysr@777:       diff = _max_pending_cards - _pending_cards;
ysr@777:     _pending_card_diff_seq->add((double) diff);
ysr@777: 
ysr@777:     double cost_per_card_ms = 0.0;
ysr@777:     if (_pending_cards > 0) {
ysr@777:       cost_per_card_ms = update_rs_time / (double) _pending_cards;
ysr@777:       _cost_per_card_ms_seq->add(cost_per_card_ms);
ysr@777:     }
ysr@777: 
ysr@777:     double cost_per_scan_only_region_ms = 0.0;
ysr@777:     if (scan_only_regions_scanned > 0.0) {
ysr@777:       cost_per_scan_only_region_ms =
ysr@777:         scan_only_time / scan_only_regions_scanned;
ysr@777:       if (_in_marking_window_im)
ysr@777:         _cost_per_scan_only_region_ms_during_cm_seq->add(cost_per_scan_only_region_ms);
ysr@777:       else
ysr@777:         _cost_per_scan_only_region_ms_seq->add(cost_per_scan_only_region_ms);
ysr@777:     }
ysr@777: 
ysr@777:     size_t cards_scanned = _g1->cards_scanned();
ysr@777: 
ysr@777:     double cost_per_entry_ms = 0.0;
ysr@777:     if (cards_scanned > 10) {
ysr@777:       cost_per_entry_ms = scan_rs_time / (double) cards_scanned;
ysr@777:       if (_last_young_gc_full)
ysr@777:         _cost_per_entry_ms_seq->add(cost_per_entry_ms);
ysr@777:       else
ysr@777:         _partially_young_cost_per_entry_ms_seq->add(cost_per_entry_ms);
ysr@777:     }
ysr@777: 
ysr@777:     if (_max_rs_lengths > 0) {
ysr@777:       double cards_per_entry_ratio =
ysr@777:         (double) cards_scanned / (double) _max_rs_lengths;
ysr@777:       if (_last_young_gc_full)
ysr@777:         _fully_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio);
ysr@777:       else
ysr@777:         _partially_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio);
ysr@777:     }
ysr@777: 
ysr@777:     size_t rs_length_diff = _max_rs_lengths - _recorded_rs_lengths;
ysr@777:     if (rs_length_diff >= 0)
ysr@777:       _rs_length_diff_seq->add((double) rs_length_diff);
ysr@777: 
ysr@777:     size_t copied_bytes = surviving_bytes;
ysr@777:     double cost_per_byte_ms = 0.0;
ysr@777:     if (copied_bytes > 0) {
ysr@777:       cost_per_byte_ms = obj_copy_time / (double) copied_bytes;
ysr@777:       if (_in_marking_window)
ysr@777:         _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms);
ysr@777:       else
ysr@777:         _cost_per_byte_ms_seq->add(cost_per_byte_ms);
ysr@777:     }
ysr@777: 
ysr@777:     double all_other_time_ms = pause_time_ms -
ysr@777:       (update_rs_time + scan_only_time + scan_rs_time + obj_copy_time +
ysr@777:        _mark_closure_time_ms + termination_time);
ysr@777: 
ysr@777:     double young_other_time_ms = 0.0;
ysr@777:     if (_recorded_young_regions > 0) {
ysr@777:       young_other_time_ms =
ysr@777:         _recorded_young_cset_choice_time_ms +
ysr@777:         _recorded_young_free_cset_time_ms;
ysr@777:       _young_other_cost_per_region_ms_seq->add(young_other_time_ms /
ysr@777:                                              (double) _recorded_young_regions);
ysr@777:     }
ysr@777:     double non_young_other_time_ms = 0.0;
ysr@777:     if (_recorded_non_young_regions > 0) {
ysr@777:       non_young_other_time_ms =
ysr@777:         _recorded_non_young_cset_choice_time_ms +
ysr@777:         _recorded_non_young_free_cset_time_ms;
ysr@777: 
ysr@777:       _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms /
ysr@777:                                          (double) _recorded_non_young_regions);
ysr@777:     }
ysr@777: 
ysr@777:     double constant_other_time_ms = all_other_time_ms -
ysr@777:       (young_other_time_ms + non_young_other_time_ms);
ysr@777:     _constant_other_time_ms_seq->add(constant_other_time_ms);
ysr@777: 
ysr@777:     double survival_ratio = 0.0;
ysr@777:     if (_bytes_in_collection_set_before_gc > 0) {
ysr@777:       survival_ratio = (double) bytes_in_to_space_during_gc() /
ysr@777:         (double) _bytes_in_collection_set_before_gc;
ysr@777:     }
ysr@777: 
ysr@777:     _pending_cards_seq->add((double) _pending_cards);
ysr@777:     _scanned_cards_seq->add((double) cards_scanned);
ysr@777:     _rs_lengths_seq->add((double) _max_rs_lengths);
ysr@777: 
ysr@777:     double expensive_region_limit_ms =
ysr@777:       (double) G1MaxPauseTimeMS - predict_constant_other_time_ms();
ysr@777:     if (expensive_region_limit_ms < 0.0) {
ysr@777:       // this means that the other time was predicted to be longer than
ysr@777:       // than the max pause time
ysr@777:       expensive_region_limit_ms = (double) G1MaxPauseTimeMS;
ysr@777:     }
ysr@777:     _expensive_region_limit_ms = expensive_region_limit_ms;
ysr@777: 
ysr@777:     if (PREDICTIONS_VERBOSE) {
ysr@777:       gclog_or_tty->print_cr("");
ysr@777:       gclog_or_tty->print_cr("PREDICTIONS %1.4lf %d "
ysr@777:                     "REGIONS %d %d %d %d "
ysr@777:                     "PENDING_CARDS %d %d "
ysr@777:                     "CARDS_SCANNED %d %d "
ysr@777:                     "RS_LENGTHS %d %d "
ysr@777:                     "SCAN_ONLY_SCAN %1.6lf %1.6lf "
ysr@777:                     "RS_UPDATE %1.6lf %1.6lf RS_SCAN %1.6lf %1.6lf "
ysr@777:                     "SURVIVAL_RATIO %1.6lf %1.6lf "
ysr@777:                     "OBJECT_COPY %1.6lf %1.6lf OTHER_CONSTANT %1.6lf %1.6lf "
ysr@777:                     "OTHER_YOUNG %1.6lf %1.6lf "
ysr@777:                     "OTHER_NON_YOUNG %1.6lf %1.6lf "
ysr@777:                     "VTIME_DIFF %1.6lf TERMINATION %1.6lf "
ysr@777:                     "ELAPSED %1.6lf %1.6lf ",
ysr@777:                     _cur_collection_start_sec,
ysr@777:                     (!_last_young_gc_full) ? 2 :
ysr@777:                     (last_pause_included_initial_mark) ? 1 : 0,
ysr@777:                     _recorded_region_num,
ysr@777:                     _recorded_young_regions,
ysr@777:                     _recorded_scan_only_regions,
ysr@777:                     _recorded_non_young_regions,
ysr@777:                     _predicted_pending_cards, _pending_cards,
ysr@777:                     _predicted_cards_scanned, cards_scanned,
ysr@777:                     _predicted_rs_lengths, _max_rs_lengths,
ysr@777:                     _predicted_scan_only_scan_time_ms, scan_only_time,
ysr@777:                     _predicted_rs_update_time_ms, update_rs_time,
ysr@777:                     _predicted_rs_scan_time_ms, scan_rs_time,
ysr@777:                     _predicted_survival_ratio, survival_ratio,
ysr@777:                     _predicted_object_copy_time_ms, obj_copy_time,
ysr@777:                     _predicted_constant_other_time_ms, constant_other_time_ms,
ysr@777:                     _predicted_young_other_time_ms, young_other_time_ms,
ysr@777:                     _predicted_non_young_other_time_ms,
ysr@777:                     non_young_other_time_ms,
ysr@777:                     _vtime_diff_ms, termination_time,
ysr@777:                     _predicted_pause_time_ms, elapsed_ms);
ysr@777:     }
ysr@777: 
ysr@777:     if (G1PolicyVerbose > 0) {
ysr@777:       gclog_or_tty->print_cr("Pause Time, predicted: %1.4lfms (predicted %s), actual: %1.4lfms",
ysr@777:                     _predicted_pause_time_ms,
ysr@777:                     (_within_target) ? "within" : "outside",
ysr@777:                     elapsed_ms);
ysr@777:     }
ysr@777: 
ysr@777:   }
ysr@777: 
ysr@777:   _in_marking_window = new_in_marking_window;
ysr@777:   _in_marking_window_im = new_in_marking_window_im;
ysr@777:   _free_regions_at_end_of_collection = _g1->free_regions();
ysr@777:   _scan_only_regions_at_end_of_collection = _g1->young_list_length();
ysr@777:   calculate_young_list_min_length();
ysr@777:   calculate_young_list_target_config();
ysr@777: 
ysr@777:   // </NEW PREDICTION>
ysr@777: 
ysr@777:   _target_pause_time_ms = -1.0;
ysr@777: }
ysr@777: 
ysr@777: // <NEW PREDICTION>
ysr@777: 
ysr@777: double
ysr@777: G1CollectorPolicy::
ysr@777: predict_young_collection_elapsed_time_ms(size_t adjustment) {
ysr@777:   guarantee( adjustment == 0 || adjustment == 1, "invariant" );
ysr@777: 
ysr@777:   G1CollectedHeap* g1h = G1CollectedHeap::heap();
ysr@777:   size_t young_num = g1h->young_list_length();
ysr@777:   if (young_num == 0)
ysr@777:     return 0.0;
ysr@777: 
ysr@777:   young_num += adjustment;
ysr@777:   size_t pending_cards = predict_pending_cards();
ysr@777:   size_t rs_lengths = g1h->young_list_sampled_rs_lengths() +
ysr@777:                       predict_rs_length_diff();
ysr@777:   size_t card_num;
ysr@777:   if (full_young_gcs())
ysr@777:     card_num = predict_young_card_num(rs_lengths);
ysr@777:   else
ysr@777:     card_num = predict_non_young_card_num(rs_lengths);
ysr@777:   size_t young_byte_size = young_num * HeapRegion::GrainBytes;
ysr@777:   double accum_yg_surv_rate =
ysr@777:     _short_lived_surv_rate_group->accum_surv_rate(adjustment);
ysr@777: 
ysr@777:   size_t bytes_to_copy =
ysr@777:     (size_t) (accum_yg_surv_rate * (double) HeapRegion::GrainBytes);
ysr@777: 
ysr@777:   return
ysr@777:     predict_rs_update_time_ms(pending_cards) +
ysr@777:     predict_rs_scan_time_ms(card_num) +
ysr@777:     predict_object_copy_time_ms(bytes_to_copy) +
ysr@777:     predict_young_other_time_ms(young_num) +
ysr@777:     predict_constant_other_time_ms();
ysr@777: }
ysr@777: 
ysr@777: double
ysr@777: G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) {
ysr@777:   size_t rs_length = predict_rs_length_diff();
ysr@777:   size_t card_num;
ysr@777:   if (full_young_gcs())
ysr@777:     card_num = predict_young_card_num(rs_length);
ysr@777:   else
ysr@777:     card_num = predict_non_young_card_num(rs_length);
ysr@777:   return predict_base_elapsed_time_ms(pending_cards, card_num);
ysr@777: }
ysr@777: 
ysr@777: double
ysr@777: G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards,
ysr@777:                                                 size_t scanned_cards) {
ysr@777:   return
ysr@777:     predict_rs_update_time_ms(pending_cards) +
ysr@777:     predict_rs_scan_time_ms(scanned_cards) +
ysr@777:     predict_constant_other_time_ms();
ysr@777: }
ysr@777: 
ysr@777: double
ysr@777: G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr,
ysr@777:                                                   bool young) {
ysr@777:   size_t rs_length = hr->rem_set()->occupied();
ysr@777:   size_t card_num;
ysr@777:   if (full_young_gcs())
ysr@777:     card_num = predict_young_card_num(rs_length);
ysr@777:   else
ysr@777:     card_num = predict_non_young_card_num(rs_length);
ysr@777:   size_t bytes_to_copy = predict_bytes_to_copy(hr);
ysr@777: 
ysr@777:   double region_elapsed_time_ms =
ysr@777:     predict_rs_scan_time_ms(card_num) +
ysr@777:     predict_object_copy_time_ms(bytes_to_copy);
ysr@777: 
ysr@777:   if (young)
ysr@777:     region_elapsed_time_ms += predict_young_other_time_ms(1);
ysr@777:   else
ysr@777:     region_elapsed_time_ms += predict_non_young_other_time_ms(1);
ysr@777: 
ysr@777:   return region_elapsed_time_ms;
ysr@777: }
ysr@777: 
ysr@777: size_t
ysr@777: G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) {
ysr@777:   size_t bytes_to_copy;
ysr@777:   if (hr->is_marked())
ysr@777:     bytes_to_copy = hr->max_live_bytes();
ysr@777:   else {
ysr@777:     guarantee( hr->is_young() && hr->age_in_surv_rate_group() != -1,
ysr@777:                "invariant" );
ysr@777:     int age = hr->age_in_surv_rate_group();
apetrusenko@980:     double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group());
ysr@777:     bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate);
ysr@777:   }
ysr@777: 
ysr@777:   return bytes_to_copy;
ysr@777: }
ysr@777: 
ysr@777: void
ysr@777: G1CollectorPolicy::start_recording_regions() {
ysr@777:   _recorded_rs_lengths            = 0;
ysr@777:   _recorded_scan_only_regions     = 0;
ysr@777:   _recorded_young_regions         = 0;
ysr@777:   _recorded_non_young_regions     = 0;
ysr@777: 
ysr@777: #if PREDICTIONS_VERBOSE
ysr@777:   _predicted_rs_lengths           = 0;
ysr@777:   _predicted_cards_scanned        = 0;
ysr@777: 
ysr@777:   _recorded_marked_bytes          = 0;
ysr@777:   _recorded_young_bytes           = 0;
ysr@777:   _predicted_bytes_to_copy        = 0;
ysr@777: #endif // PREDICTIONS_VERBOSE
ysr@777: }
ysr@777: 
ysr@777: void
ysr@777: G1CollectorPolicy::record_cset_region(HeapRegion* hr, bool young) {
ysr@777:   if (young) {
ysr@777:     ++_recorded_young_regions;
ysr@777:   } else {
ysr@777:     ++_recorded_non_young_regions;
ysr@777:   }
ysr@777: #if PREDICTIONS_VERBOSE
ysr@777:   if (young) {
apetrusenko@980:     _recorded_young_bytes += hr->used();
ysr@777:   } else {
ysr@777:     _recorded_marked_bytes += hr->max_live_bytes();
ysr@777:   }
ysr@777:   _predicted_bytes_to_copy += predict_bytes_to_copy(hr);
ysr@777: #endif // PREDICTIONS_VERBOSE
ysr@777: 
ysr@777:   size_t rs_length = hr->rem_set()->occupied();
ysr@777:   _recorded_rs_lengths += rs_length;
ysr@777: }
ysr@777: 
ysr@777: void
ysr@777: G1CollectorPolicy::record_scan_only_regions(size_t scan_only_length) {
ysr@777:   _recorded_scan_only_regions = scan_only_length;
ysr@777: }
ysr@777: 
ysr@777: void
ysr@777: G1CollectorPolicy::end_recording_regions() {
ysr@777: #if PREDICTIONS_VERBOSE
ysr@777:   _predicted_pending_cards = predict_pending_cards();
ysr@777:   _predicted_rs_lengths = _recorded_rs_lengths + predict_rs_length_diff();
ysr@777:   if (full_young_gcs())
ysr@777:     _predicted_cards_scanned += predict_young_card_num(_predicted_rs_lengths);
ysr@777:   else
ysr@777:     _predicted_cards_scanned +=
ysr@777:       predict_non_young_card_num(_predicted_rs_lengths);
ysr@777:   _recorded_region_num = _recorded_young_regions + _recorded_non_young_regions;
ysr@777: 
ysr@777:   _predicted_scan_only_scan_time_ms =
ysr@777:     predict_scan_only_time_ms(_recorded_scan_only_regions);
ysr@777:   _predicted_rs_update_time_ms =
ysr@777:     predict_rs_update_time_ms(_g1->pending_card_num());
ysr@777:   _predicted_rs_scan_time_ms =
ysr@777:     predict_rs_scan_time_ms(_predicted_cards_scanned);
ysr@777:   _predicted_object_copy_time_ms =
ysr@777:     predict_object_copy_time_ms(_predicted_bytes_to_copy);
ysr@777:   _predicted_constant_other_time_ms =
ysr@777:     predict_constant_other_time_ms();
ysr@777:   _predicted_young_other_time_ms =
ysr@777:     predict_young_other_time_ms(_recorded_young_regions);
ysr@777:   _predicted_non_young_other_time_ms =
ysr@777:     predict_non_young_other_time_ms(_recorded_non_young_regions);
ysr@777: 
ysr@777:   _predicted_pause_time_ms =
ysr@777:     _predicted_scan_only_scan_time_ms +
ysr@777:     _predicted_rs_update_time_ms +
ysr@777:     _predicted_rs_scan_time_ms +
ysr@777:     _predicted_object_copy_time_ms +
ysr@777:     _predicted_constant_other_time_ms +
ysr@777:     _predicted_young_other_time_ms +
ysr@777:     _predicted_non_young_other_time_ms;
ysr@777: #endif // PREDICTIONS_VERBOSE
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::check_if_region_is_too_expensive(double
ysr@777:                                                            predicted_time_ms) {
ysr@777:   // I don't think we need to do this when in young GC mode since
ysr@777:   // marking will be initiated next time we hit the soft limit anyway...
ysr@777:   if (predicted_time_ms > _expensive_region_limit_ms) {
ysr@777:     if (!in_young_gc_mode()) {
ysr@777:         set_full_young_gcs(true);
ysr@777:       _should_initiate_conc_mark = true;
ysr@777:     } else
ysr@777:       // no point in doing another partial one
ysr@777:       _should_revert_to_full_young_gcs = true;
ysr@777:   }
ysr@777: }
ysr@777: 
ysr@777: // </NEW PREDICTION>
ysr@777: 
ysr@777: 
ysr@777: void G1CollectorPolicy::update_recent_gc_times(double end_time_sec,
ysr@777:                                                double elapsed_ms) {
ysr@777:   _recent_gc_times_ms->add(elapsed_ms);
ysr@777:   _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec);
ysr@777:   _prev_collection_pause_end_ms = end_time_sec * 1000.0;
ysr@777: }
ysr@777: 
ysr@777: double G1CollectorPolicy::recent_avg_time_for_pauses_ms() {
ysr@777:   if (_recent_pause_times_ms->num() == 0) return (double) G1MaxPauseTimeMS;
ysr@777:   else return _recent_pause_times_ms->avg();
ysr@777: }
ysr@777: 
ysr@777: double G1CollectorPolicy::recent_avg_time_for_CH_strong_ms() {
ysr@777:   if (_recent_CH_strong_roots_times_ms->num() == 0)
ysr@777:     return (double)G1MaxPauseTimeMS/3.0;
ysr@777:   else return _recent_CH_strong_roots_times_ms->avg();
ysr@777: }
ysr@777: 
ysr@777: double G1CollectorPolicy::recent_avg_time_for_G1_strong_ms() {
ysr@777:   if (_recent_G1_strong_roots_times_ms->num() == 0)
ysr@777:     return (double)G1MaxPauseTimeMS/3.0;
ysr@777:   else return _recent_G1_strong_roots_times_ms->avg();
ysr@777: }
ysr@777: 
ysr@777: double G1CollectorPolicy::recent_avg_time_for_evac_ms() {
ysr@777:   if (_recent_evac_times_ms->num() == 0) return (double)G1MaxPauseTimeMS/3.0;
ysr@777:   else return _recent_evac_times_ms->avg();
ysr@777: }
ysr@777: 
ysr@777: int G1CollectorPolicy::number_of_recent_gcs() {
ysr@777:   assert(_recent_CH_strong_roots_times_ms->num() ==
ysr@777:          _recent_G1_strong_roots_times_ms->num(), "Sequence out of sync");
ysr@777:   assert(_recent_G1_strong_roots_times_ms->num() ==
ysr@777:          _recent_evac_times_ms->num(), "Sequence out of sync");
ysr@777:   assert(_recent_evac_times_ms->num() ==
ysr@777:          _recent_pause_times_ms->num(), "Sequence out of sync");
ysr@777:   assert(_recent_pause_times_ms->num() ==
ysr@777:          _recent_CS_bytes_used_before->num(), "Sequence out of sync");
ysr@777:   assert(_recent_CS_bytes_used_before->num() ==
ysr@777:          _recent_CS_bytes_surviving->num(), "Sequence out of sync");
ysr@777:   return _recent_pause_times_ms->num();
ysr@777: }
ysr@777: 
ysr@777: double G1CollectorPolicy::recent_avg_survival_fraction() {
ysr@777:   return recent_avg_survival_fraction_work(_recent_CS_bytes_surviving,
ysr@777:                                            _recent_CS_bytes_used_before);
ysr@777: }
ysr@777: 
ysr@777: double G1CollectorPolicy::last_survival_fraction() {
ysr@777:   return last_survival_fraction_work(_recent_CS_bytes_surviving,
ysr@777:                                      _recent_CS_bytes_used_before);
ysr@777: }
ysr@777: 
ysr@777: double
ysr@777: G1CollectorPolicy::recent_avg_survival_fraction_work(TruncatedSeq* surviving,
ysr@777:                                                      TruncatedSeq* before) {
ysr@777:   assert(surviving->num() == before->num(), "Sequence out of sync");
ysr@777:   if (before->sum() > 0.0) {
ysr@777:       double recent_survival_rate = surviving->sum() / before->sum();
ysr@777:       // We exempt parallel collection from this check because Alloc Buffer
ysr@777:       // fragmentation can produce negative collections.
ysr@777:       // Further, we're now always doing parallel collection.  But I'm still
ysr@777:       // leaving this here as a placeholder for a more precise assertion later.
ysr@777:       // (DLD, 10/05.)
ysr@777:       assert((true || ParallelGCThreads > 0) ||
ysr@777:              _g1->evacuation_failed() ||
ysr@777:              recent_survival_rate <= 1.0, "Or bad frac");
ysr@777:       return recent_survival_rate;
ysr@777:   } else {
ysr@777:     return 1.0; // Be conservative.
ysr@777:   }
ysr@777: }
ysr@777: 
ysr@777: double
ysr@777: G1CollectorPolicy::last_survival_fraction_work(TruncatedSeq* surviving,
ysr@777:                                                TruncatedSeq* before) {
ysr@777:   assert(surviving->num() == before->num(), "Sequence out of sync");
ysr@777:   if (surviving->num() > 0 && before->last() > 0.0) {
ysr@777:     double last_survival_rate = surviving->last() / before->last();
ysr@777:     // We exempt parallel collection from this check because Alloc Buffer
ysr@777:     // fragmentation can produce negative collections.
ysr@777:     // Further, we're now always doing parallel collection.  But I'm still
ysr@777:     // leaving this here as a placeholder for a more precise assertion later.
ysr@777:     // (DLD, 10/05.)
ysr@777:     assert((true || ParallelGCThreads > 0) ||
ysr@777:            last_survival_rate <= 1.0, "Or bad frac");
ysr@777:     return last_survival_rate;
ysr@777:   } else {
ysr@777:     return 1.0;
ysr@777:   }
ysr@777: }
ysr@777: 
ysr@777: static const int survival_min_obs = 5;
ysr@777: static double survival_min_obs_limits[] = { 0.9, 0.7, 0.5, 0.3, 0.1 };
ysr@777: static const double min_survival_rate = 0.1;
ysr@777: 
ysr@777: double
ysr@777: G1CollectorPolicy::conservative_avg_survival_fraction_work(double avg,
ysr@777:                                                            double latest) {
ysr@777:   double res = avg;
ysr@777:   if (number_of_recent_gcs() < survival_min_obs) {
ysr@777:     res = MAX2(res, survival_min_obs_limits[number_of_recent_gcs()]);
ysr@777:   }
ysr@777:   res = MAX2(res, latest);
ysr@777:   res = MAX2(res, min_survival_rate);
ysr@777:   // In the parallel case, LAB fragmentation can produce "negative
ysr@777:   // collections"; so can evac failure.  Cap at 1.0
ysr@777:   res = MIN2(res, 1.0);
ysr@777:   return res;
ysr@777: }
ysr@777: 
ysr@777: size_t G1CollectorPolicy::expansion_amount() {
ysr@777:   if ((int)(recent_avg_pause_time_ratio() * 100.0) > G1GCPct) {
ysr@777:     // We will double the existing space, or take G1ExpandByPctOfAvail % of
ysr@777:     // the available expansion space, whichever is smaller, bounded below
ysr@777:     // by a minimum expansion (unless that's all that's left.)
ysr@777:     const size_t min_expand_bytes = 1*M;
ysr@777:     size_t reserved_bytes = _g1->g1_reserved_obj_bytes();
ysr@777:     size_t committed_bytes = _g1->capacity();
ysr@777:     size_t uncommitted_bytes = reserved_bytes - committed_bytes;
ysr@777:     size_t expand_bytes;
ysr@777:     size_t expand_bytes_via_pct =
ysr@777:       uncommitted_bytes * G1ExpandByPctOfAvail / 100;
ysr@777:     expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes);
ysr@777:     expand_bytes = MAX2(expand_bytes, min_expand_bytes);
ysr@777:     expand_bytes = MIN2(expand_bytes, uncommitted_bytes);
ysr@777:     if (G1PolicyVerbose > 1) {
ysr@777:       gclog_or_tty->print("Decided to expand: ratio = %5.2f, "
ysr@777:                  "committed = %d%s, uncommited = %d%s, via pct = %d%s.\n"
ysr@777:                  "                   Answer = %d.\n",
ysr@777:                  recent_avg_pause_time_ratio(),
ysr@777:                  byte_size_in_proper_unit(committed_bytes),
ysr@777:                  proper_unit_for_byte_size(committed_bytes),
ysr@777:                  byte_size_in_proper_unit(uncommitted_bytes),
ysr@777:                  proper_unit_for_byte_size(uncommitted_bytes),
ysr@777:                  byte_size_in_proper_unit(expand_bytes_via_pct),
ysr@777:                  proper_unit_for_byte_size(expand_bytes_via_pct),
ysr@777:                  byte_size_in_proper_unit(expand_bytes),
ysr@777:                  proper_unit_for_byte_size(expand_bytes));
ysr@777:     }
ysr@777:     return expand_bytes;
ysr@777:   } else {
ysr@777:     return 0;
ysr@777:   }
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::note_start_of_mark_thread() {
ysr@777:   _mark_thread_startup_sec = os::elapsedTime();
ysr@777: }
ysr@777: 
ysr@777: class CountCSClosure: public HeapRegionClosure {
ysr@777:   G1CollectorPolicy* _g1_policy;
ysr@777: public:
ysr@777:   CountCSClosure(G1CollectorPolicy* g1_policy) :
ysr@777:     _g1_policy(g1_policy) {}
ysr@777:   bool doHeapRegion(HeapRegion* r) {
ysr@777:     _g1_policy->_bytes_in_collection_set_before_gc += r->used();
ysr@777:     return false;
ysr@777:   }
ysr@777: };
ysr@777: 
ysr@777: void G1CollectorPolicy::count_CS_bytes_used() {
ysr@777:   CountCSClosure cs_closure(this);
ysr@777:   _g1->collection_set_iterate(&cs_closure);
ysr@777: }
ysr@777: 
ysr@777: static void print_indent(int level) {
ysr@777:   for (int j = 0; j < level+1; ++j)
ysr@777:     gclog_or_tty->print("   ");
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::print_summary (int level,
ysr@777:                                        const char* str,
ysr@777:                                        NumberSeq* seq) const {
ysr@777:   double sum = seq->sum();
ysr@777:   print_indent(level);
ysr@777:   gclog_or_tty->print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)",
ysr@777:                 str, sum / 1000.0, seq->avg());
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::print_summary_sd (int level,
ysr@777:                                           const char* str,
ysr@777:                                           NumberSeq* seq) const {
ysr@777:   print_summary(level, str, seq);
ysr@777:   print_indent(level + 5);
ysr@777:   gclog_or_tty->print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)",
ysr@777:                 seq->num(), seq->sd(), seq->maximum());
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::check_other_times(int level,
ysr@777:                                         NumberSeq* other_times_ms,
ysr@777:                                         NumberSeq* calc_other_times_ms) const {
ysr@777:   bool should_print = false;
ysr@777: 
ysr@777:   double max_sum = MAX2(fabs(other_times_ms->sum()),
ysr@777:                         fabs(calc_other_times_ms->sum()));
ysr@777:   double min_sum = MIN2(fabs(other_times_ms->sum()),
ysr@777:                         fabs(calc_other_times_ms->sum()));
ysr@777:   double sum_ratio = max_sum / min_sum;
ysr@777:   if (sum_ratio > 1.1) {
ysr@777:     should_print = true;
ysr@777:     print_indent(level + 1);
ysr@777:     gclog_or_tty->print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###");
ysr@777:   }
ysr@777: 
ysr@777:   double max_avg = MAX2(fabs(other_times_ms->avg()),
ysr@777:                         fabs(calc_other_times_ms->avg()));
ysr@777:   double min_avg = MIN2(fabs(other_times_ms->avg()),
ysr@777:                         fabs(calc_other_times_ms->avg()));
ysr@777:   double avg_ratio = max_avg / min_avg;
ysr@777:   if (avg_ratio > 1.1) {
ysr@777:     should_print = true;
ysr@777:     print_indent(level + 1);
ysr@777:     gclog_or_tty->print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###");
ysr@777:   }
ysr@777: 
ysr@777:   if (other_times_ms->sum() < -0.01) {
ysr@777:     print_indent(level + 1);
ysr@777:     gclog_or_tty->print_cr("## RECORDED OTHER SUM IS NEGATIVE ###");
ysr@777:   }
ysr@777: 
ysr@777:   if (other_times_ms->avg() < -0.01) {
ysr@777:     print_indent(level + 1);
ysr@777:     gclog_or_tty->print_cr("## RECORDED OTHER AVG IS NEGATIVE ###");
ysr@777:   }
ysr@777: 
ysr@777:   if (calc_other_times_ms->sum() < -0.01) {
ysr@777:     should_print = true;
ysr@777:     print_indent(level + 1);
ysr@777:     gclog_or_tty->print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###");
ysr@777:   }
ysr@777: 
ysr@777:   if (calc_other_times_ms->avg() < -0.01) {
ysr@777:     should_print = true;
ysr@777:     print_indent(level + 1);
ysr@777:     gclog_or_tty->print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###");
ysr@777:   }
ysr@777: 
ysr@777:   if (should_print)
ysr@777:     print_summary(level, "Other(Calc)", calc_other_times_ms);
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::print_summary(PauseSummary* summary) const {
ysr@777:   bool parallel = ParallelGCThreads > 0;
ysr@777:   MainBodySummary*    body_summary = summary->main_body_summary();
ysr@777:   PopPreambleSummary* preamble_summary = summary->pop_preamble_summary();
ysr@777: 
ysr@777:   if (summary->get_total_seq()->num() > 0) {
ysr@777:     print_summary_sd(0,
ysr@777:                      (preamble_summary == NULL) ? "Non-Popular Pauses" :
ysr@777:                      "Popular Pauses",
ysr@777:                      summary->get_total_seq());
ysr@777:     if (preamble_summary != NULL) {
ysr@777:       print_summary(1, "Popularity Preamble",
ysr@777:                     preamble_summary->get_pop_preamble_seq());
ysr@777:       print_summary(2, "Update RS", preamble_summary->get_pop_update_rs_seq());
ysr@777:       print_summary(2, "Scan RS", preamble_summary->get_pop_scan_rs_seq());
ysr@777:       print_summary(2, "Closure App",
ysr@777:                     preamble_summary->get_pop_closure_app_seq());
ysr@777:       print_summary(2, "Evacuation",
ysr@777:                     preamble_summary->get_pop_evacuation_seq());
ysr@777:       print_summary(2, "Other", preamble_summary->get_pop_other_seq());
ysr@777:       {
ysr@777:         NumberSeq* other_parts[] = {
ysr@777:           preamble_summary->get_pop_update_rs_seq(),
ysr@777:           preamble_summary->get_pop_scan_rs_seq(),
ysr@777:           preamble_summary->get_pop_closure_app_seq(),
ysr@777:           preamble_summary->get_pop_evacuation_seq()
ysr@777:         };
ysr@777:         NumberSeq calc_other_times_ms(preamble_summary->get_pop_preamble_seq(),
ysr@777:                                       4, other_parts);
ysr@777:         check_other_times(2, preamble_summary->get_pop_other_seq(),
ysr@777:                           &calc_other_times_ms);
ysr@777:       }
ysr@777:     }
ysr@777:     if (body_summary != NULL) {
ysr@777:       print_summary(1, "SATB Drain", body_summary->get_satb_drain_seq());
ysr@777:       if (parallel) {
ysr@777:         print_summary(1, "Parallel Time", body_summary->get_parallel_seq());
ysr@777:         print_summary(2, "Update RS", body_summary->get_update_rs_seq());
ysr@777:         print_summary(2, "Ext Root Scanning",
ysr@777:                       body_summary->get_ext_root_scan_seq());
ysr@777:         print_summary(2, "Mark Stack Scanning",
ysr@777:                       body_summary->get_mark_stack_scan_seq());
ysr@777:         print_summary(2, "Scan-Only Scanning",
ysr@777:                       body_summary->get_scan_only_seq());
ysr@777:         print_summary(2, "Scan RS", body_summary->get_scan_rs_seq());
ysr@777:         print_summary(2, "Object Copy", body_summary->get_obj_copy_seq());
ysr@777:         print_summary(2, "Termination", body_summary->get_termination_seq());
ysr@777:         print_summary(2, "Other", body_summary->get_parallel_other_seq());
ysr@777:         {
ysr@777:           NumberSeq* other_parts[] = {
ysr@777:             body_summary->get_update_rs_seq(),
ysr@777:             body_summary->get_ext_root_scan_seq(),
ysr@777:             body_summary->get_mark_stack_scan_seq(),
ysr@777:             body_summary->get_scan_only_seq(),
ysr@777:             body_summary->get_scan_rs_seq(),
ysr@777:             body_summary->get_obj_copy_seq(),
ysr@777:             body_summary->get_termination_seq()
ysr@777:           };
ysr@777:           NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(),
ysr@777:                                         7, other_parts);
ysr@777:           check_other_times(2, body_summary->get_parallel_other_seq(),
ysr@777:                             &calc_other_times_ms);
ysr@777:         }
ysr@777:         print_summary(1, "Mark Closure", body_summary->get_mark_closure_seq());
ysr@777:         print_summary(1, "Clear CT", body_summary->get_clear_ct_seq());
ysr@777:       } else {
ysr@777:         print_summary(1, "Update RS", body_summary->get_update_rs_seq());
ysr@777:         print_summary(1, "Ext Root Scanning",
ysr@777:                       body_summary->get_ext_root_scan_seq());
ysr@777:         print_summary(1, "Mark Stack Scanning",
ysr@777:                       body_summary->get_mark_stack_scan_seq());
ysr@777:         print_summary(1, "Scan-Only Scanning",
ysr@777:                       body_summary->get_scan_only_seq());
ysr@777:         print_summary(1, "Scan RS", body_summary->get_scan_rs_seq());
ysr@777:         print_summary(1, "Object Copy", body_summary->get_obj_copy_seq());
ysr@777:       }
ysr@777:     }
ysr@777:     print_summary(1, "Other", summary->get_other_seq());
ysr@777:     {
ysr@777:       NumberSeq calc_other_times_ms;
ysr@777:       if (body_summary != NULL) {
ysr@777:         // not abandoned
ysr@777:         if (parallel) {
ysr@777:           // parallel
ysr@777:           NumberSeq* other_parts[] = {
ysr@777:             body_summary->get_satb_drain_seq(),
ysr@777:             (preamble_summary == NULL) ? NULL :
ysr@777:               preamble_summary->get_pop_preamble_seq(),
ysr@777:             body_summary->get_parallel_seq(),
ysr@777:             body_summary->get_clear_ct_seq()
ysr@777:           };
ysr@777:           calc_other_times_ms = NumberSeq (summary->get_total_seq(),
ysr@777:                                           4, other_parts);
ysr@777:         } else {
ysr@777:           // serial
ysr@777:           NumberSeq* other_parts[] = {
ysr@777:             body_summary->get_satb_drain_seq(),
ysr@777:             (preamble_summary == NULL) ? NULL :
ysr@777:               preamble_summary->get_pop_preamble_seq(),
ysr@777:             body_summary->get_update_rs_seq(),
ysr@777:             body_summary->get_ext_root_scan_seq(),
ysr@777:             body_summary->get_mark_stack_scan_seq(),
ysr@777:             body_summary->get_scan_only_seq(),
ysr@777:             body_summary->get_scan_rs_seq(),
ysr@777:             body_summary->get_obj_copy_seq()
ysr@777:           };
ysr@777:           calc_other_times_ms = NumberSeq(summary->get_total_seq(),
ysr@777:                                           8, other_parts);
ysr@777:         }
ysr@777:       } else {
ysr@777:         // abandoned
ysr@777:         NumberSeq* other_parts[] = {
ysr@777:           (preamble_summary == NULL) ? NULL :
ysr@777:             preamble_summary->get_pop_preamble_seq()
ysr@777:         };
ysr@777:         calc_other_times_ms = NumberSeq(summary->get_total_seq(),
ysr@777:                                         1, other_parts);
ysr@777:       }
ysr@777:       check_other_times(1,  summary->get_other_seq(), &calc_other_times_ms);
ysr@777:     }
ysr@777:   } else {
ysr@777:     print_indent(0);
ysr@777:     gclog_or_tty->print_cr("none");
ysr@777:   }
ysr@777:   gclog_or_tty->print_cr("");
ysr@777: }
ysr@777: 
ysr@777: void
ysr@777: G1CollectorPolicy::print_abandoned_summary(PauseSummary* non_pop_summary,
ysr@777:                                            PauseSummary* pop_summary) const {
ysr@777:   bool printed = false;
ysr@777:   if (non_pop_summary->get_total_seq()->num() > 0) {
ysr@777:     printed = true;
ysr@777:     print_summary(non_pop_summary);
ysr@777:   }
ysr@777:   if (pop_summary->get_total_seq()->num() > 0) {
ysr@777:     printed = true;
ysr@777:     print_summary(pop_summary);
ysr@777:   }
ysr@777: 
ysr@777:   if (!printed) {
ysr@777:     print_indent(0);
ysr@777:     gclog_or_tty->print_cr("none");
ysr@777:     gclog_or_tty->print_cr("");
ysr@777:   }
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::print_tracing_info() const {
ysr@777:   if (TraceGen0Time) {
ysr@777:     gclog_or_tty->print_cr("ALL PAUSES");
ysr@777:     print_summary_sd(0, "Total", _all_pause_times_ms);
ysr@777:     gclog_or_tty->print_cr("");
ysr@777:     gclog_or_tty->print_cr("");
ysr@777:     gclog_or_tty->print_cr("   Full Young GC Pauses:    %8d", _full_young_pause_num);
ysr@777:     gclog_or_tty->print_cr("   Partial Young GC Pauses: %8d", _partial_young_pause_num);
ysr@777:     gclog_or_tty->print_cr("");
ysr@777: 
ysr@777:     gclog_or_tty->print_cr("NON-POPULAR PAUSES");
ysr@777:     print_summary(_non_pop_summary);
ysr@777: 
ysr@777:     gclog_or_tty->print_cr("POPULAR PAUSES");
ysr@777:     print_summary(_pop_summary);
ysr@777: 
ysr@777:     gclog_or_tty->print_cr("ABANDONED PAUSES");
ysr@777:     print_abandoned_summary(_non_pop_abandoned_summary,
ysr@777:                             _pop_abandoned_summary);
ysr@777: 
ysr@777:     gclog_or_tty->print_cr("MISC");
ysr@777:     print_summary_sd(0, "Stop World", _all_stop_world_times_ms);
ysr@777:     print_summary_sd(0, "Yields", _all_yield_times_ms);
ysr@777:     for (int i = 0; i < _aux_num; ++i) {
ysr@777:       if (_all_aux_times_ms[i].num() > 0) {
ysr@777:         char buffer[96];
ysr@777:         sprintf(buffer, "Aux%d", i);
ysr@777:         print_summary_sd(0, buffer, &_all_aux_times_ms[i]);
ysr@777:       }
ysr@777:     }
ysr@777: 
ysr@777:     size_t all_region_num = _region_num_young + _region_num_tenured;
ysr@777:     gclog_or_tty->print_cr("   New Regions %8d, Young %8d (%6.2lf%%), "
ysr@777:                "Tenured %8d (%6.2lf%%)",
ysr@777:                all_region_num,
ysr@777:                _region_num_young,
ysr@777:                (double) _region_num_young / (double) all_region_num * 100.0,
ysr@777:                _region_num_tenured,
ysr@777:                (double) _region_num_tenured / (double) all_region_num * 100.0);
ysr@777: 
ysr@777:     if (!G1RSBarrierUseQueue) {
ysr@777:       gclog_or_tty->print_cr("Of %d times conc refinement was enabled, %d (%7.2f%%) "
ysr@777:                     "did zero traversals.",
ysr@777:                     _conc_refine_enabled, _conc_refine_zero_traversals,
ysr@777:                     _conc_refine_enabled > 0 ?
ysr@777:                     100.0 * (float)_conc_refine_zero_traversals/
ysr@777:                     (float)_conc_refine_enabled : 0.0);
ysr@777:       gclog_or_tty->print_cr("  Max # of traversals = %d.",
ysr@777:                     _conc_refine_max_traversals);
ysr@777:       gclog_or_tty->print_cr("");
ysr@777:     }
ysr@777:   }
ysr@777:   if (TraceGen1Time) {
ysr@777:     if (_all_full_gc_times_ms->num() > 0) {
ysr@777:       gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s",
ysr@777:                  _all_full_gc_times_ms->num(),
ysr@777:                  _all_full_gc_times_ms->sum() / 1000.0);
ysr@777:       gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg());
ysr@777:       gclog_or_tty->print_cr("                     [std. dev = %8.2f ms, max = %8.2f ms]",
ysr@777:                     _all_full_gc_times_ms->sd(),
ysr@777:                     _all_full_gc_times_ms->maximum());
ysr@777:     }
ysr@777:   }
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::print_yg_surv_rate_info() const {
ysr@777: #ifndef PRODUCT
ysr@777:   _short_lived_surv_rate_group->print_surv_rate_summary();
ysr@777:   // add this call for any other surv rate groups
ysr@777: #endif // PRODUCT
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::update_conc_refine_data() {
ysr@777:   unsigned traversals = _g1->concurrent_g1_refine()->disable();
ysr@777:   if (traversals == 0) _conc_refine_zero_traversals++;
ysr@777:   _conc_refine_max_traversals = MAX2(_conc_refine_max_traversals,
ysr@777:                                      (size_t)traversals);
ysr@777: 
ysr@777:   if (G1PolicyVerbose > 1)
ysr@777:     gclog_or_tty->print_cr("Did a CR traversal series: %d traversals.", traversals);
ysr@777:   double multiplier = 1.0;
ysr@777:   if (traversals == 0) {
ysr@777:     multiplier = 4.0;
ysr@777:   } else if (traversals > (size_t)G1ConcRefineTargTraversals) {
ysr@777:     multiplier = 1.0/1.5;
ysr@777:   } else if (traversals < (size_t)G1ConcRefineTargTraversals) {
ysr@777:     multiplier = 1.5;
ysr@777:   }
ysr@777:   if (G1PolicyVerbose > 1) {
ysr@777:     gclog_or_tty->print_cr("  Multiplier = %7.2f.", multiplier);
ysr@777:     gclog_or_tty->print("  Delta went from %d regions to ",
ysr@777:                _conc_refine_current_delta);
ysr@777:   }
ysr@777:   _conc_refine_current_delta =
ysr@777:     MIN2(_g1->n_regions(),
ysr@777:          (size_t)(_conc_refine_current_delta * multiplier));
ysr@777:   _conc_refine_current_delta =
ysr@777:     MAX2(_conc_refine_current_delta, (size_t)1);
ysr@777:   if (G1PolicyVerbose > 1) {
ysr@777:     gclog_or_tty->print_cr("%d regions.", _conc_refine_current_delta);
ysr@777:   }
ysr@777:   _conc_refine_enabled++;
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy::set_single_region_collection_set(HeapRegion* hr) {
ysr@777:   assert(collection_set() == NULL, "Must be no current CS.");
ysr@777:   _collection_set_size = 0;
ysr@777:   _collection_set_bytes_used_before = 0;
ysr@777:   add_to_collection_set(hr);
ysr@777:   count_CS_bytes_used();
ysr@777: }
ysr@777: 
ysr@777: bool
ysr@777: G1CollectorPolicy::should_add_next_region_to_young_list() {
ysr@777:   assert(in_young_gc_mode(), "should be in young GC mode");
ysr@777:   bool ret;
ysr@777:   size_t young_list_length = _g1->young_list_length();
apetrusenko@980:   size_t young_list_max_length = _young_list_target_length;
apetrusenko@980:   if (G1FixedEdenSize) {
apetrusenko@980:     young_list_max_length -= _max_survivor_regions;
apetrusenko@980:   }
apetrusenko@980:   if (young_list_length < young_list_max_length) {
ysr@777:     ret = true;
ysr@777:     ++_region_num_young;
ysr@777:   } else {
ysr@777:     ret = false;
ysr@777:     ++_region_num_tenured;
ysr@777:   }
ysr@777: 
ysr@777:   return ret;
ysr@777: }
ysr@777: 
ysr@777: #ifndef PRODUCT
ysr@777: // for debugging, bit of a hack...
ysr@777: static char*
ysr@777: region_num_to_mbs(int length) {
ysr@777:   static char buffer[64];
ysr@777:   double bytes = (double) (length * HeapRegion::GrainBytes);
ysr@777:   double mbs = bytes / (double) (1024 * 1024);
ysr@777:   sprintf(buffer, "%7.2lfMB", mbs);
ysr@777:   return buffer;
ysr@777: }
ysr@777: #endif // PRODUCT
ysr@777: 
ysr@777: void
ysr@777: G1CollectorPolicy::checkpoint_conc_overhead() {
ysr@777:   double conc_overhead = 0.0;
ysr@777:   if (G1AccountConcurrentOverhead)
ysr@777:     conc_overhead = COTracker::totalPredConcOverhead();
ysr@777:   _mmu_tracker->update_conc_overhead(conc_overhead);
ysr@777: #if 0
ysr@777:   gclog_or_tty->print(" CO %1.4lf TARGET %1.4lf",
ysr@777:              conc_overhead, _mmu_tracker->max_gc_time());
ysr@777: #endif
ysr@777: }
ysr@777: 
ysr@777: 
apetrusenko@980: size_t G1CollectorPolicy::max_regions(int purpose) {
ysr@777:   switch (purpose) {
ysr@777:     case GCAllocForSurvived:
apetrusenko@980:       return _max_survivor_regions;
ysr@777:     case GCAllocForTenured:
apetrusenko@980:       return REGIONS_UNLIMITED;
ysr@777:     default:
apetrusenko@980:       ShouldNotReachHere();
apetrusenko@980:       return REGIONS_UNLIMITED;
ysr@777:   };
ysr@777: }
ysr@777: 
apetrusenko@980: // Calculates survivor space parameters.
apetrusenko@980: void G1CollectorPolicy::calculate_survivors_policy()
apetrusenko@980: {
apetrusenko@980:   if (!G1UseSurvivorSpace) {
apetrusenko@980:     return;
apetrusenko@980:   }
apetrusenko@980:   if (G1FixedSurvivorSpaceSize == 0) {
apetrusenko@980:     _max_survivor_regions = _young_list_target_length / SurvivorRatio;
apetrusenko@980:   } else {
apetrusenko@982:     _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes;
apetrusenko@980:   }
apetrusenko@980: 
apetrusenko@980:   if (G1FixedTenuringThreshold) {
apetrusenko@980:     _tenuring_threshold = MaxTenuringThreshold;
apetrusenko@980:   } else {
apetrusenko@980:     _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold(
apetrusenko@980:         HeapRegion::GrainWords * _max_survivor_regions);
apetrusenko@980:   }
apetrusenko@980: }
apetrusenko@980: 
apetrusenko@980: 
ysr@777: void
ysr@777: G1CollectorPolicy_BestRegionsFirst::
ysr@777: set_single_region_collection_set(HeapRegion* hr) {
ysr@777:   G1CollectorPolicy::set_single_region_collection_set(hr);
ysr@777:   _collectionSetChooser->removeRegion(hr);
ysr@777: }
ysr@777: 
ysr@777: 
ysr@777: bool
ysr@777: G1CollectorPolicy_BestRegionsFirst::should_do_collection_pause(size_t
ysr@777:                                                                word_size) {
ysr@777:   assert(_g1->regions_accounted_for(), "Region leakage!");
ysr@777:   // Initiate a pause when we reach the steady-state "used" target.
ysr@777:   size_t used_hard = (_g1->capacity() / 100) * G1SteadyStateUsed;
ysr@777:   size_t used_soft =
ysr@777:    MAX2((_g1->capacity() / 100) * (G1SteadyStateUsed - G1SteadyStateUsedDelta),
ysr@777:         used_hard/2);
ysr@777:   size_t used = _g1->used();
ysr@777: 
ysr@777:   double max_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0;
ysr@777: 
ysr@777:   size_t young_list_length = _g1->young_list_length();
apetrusenko@980:   size_t young_list_max_length = _young_list_target_length;
apetrusenko@980:   if (G1FixedEdenSize) {
apetrusenko@980:     young_list_max_length -= _max_survivor_regions;
apetrusenko@980:   }
apetrusenko@980:   bool reached_target_length = young_list_length >= young_list_max_length;
ysr@777: 
ysr@777:   if (in_young_gc_mode()) {
ysr@777:     if (reached_target_length) {
ysr@777:       assert( young_list_length > 0 && _g1->young_list_length() > 0,
ysr@777:               "invariant" );
ysr@777:       _target_pause_time_ms = max_pause_time_ms;
ysr@777:       return true;
ysr@777:     }
ysr@777:   } else {
ysr@777:     guarantee( false, "should not reach here" );
ysr@777:   }
ysr@777: 
ysr@777:   return false;
ysr@777: }
ysr@777: 
ysr@777: #ifndef PRODUCT
ysr@777: class HRSortIndexIsOKClosure: public HeapRegionClosure {
ysr@777:   CollectionSetChooser* _chooser;
ysr@777: public:
ysr@777:   HRSortIndexIsOKClosure(CollectionSetChooser* chooser) :
ysr@777:     _chooser(chooser) {}
ysr@777: 
ysr@777:   bool doHeapRegion(HeapRegion* r) {
ysr@777:     if (!r->continuesHumongous()) {
ysr@777:       assert(_chooser->regionProperlyOrdered(r), "Ought to be.");
ysr@777:     }
ysr@777:     return false;
ysr@777:   }
ysr@777: };
ysr@777: 
ysr@777: bool G1CollectorPolicy_BestRegionsFirst::assertMarkedBytesDataOK() {
ysr@777:   HRSortIndexIsOKClosure cl(_collectionSetChooser);
ysr@777:   _g1->heap_region_iterate(&cl);
ysr@777:   return true;
ysr@777: }
ysr@777: #endif
ysr@777: 
ysr@777: void
ysr@777: G1CollectorPolicy_BestRegionsFirst::
ysr@777: record_collection_pause_start(double start_time_sec, size_t start_used) {
ysr@777:   G1CollectorPolicy::record_collection_pause_start(start_time_sec, start_used);
ysr@777: }
ysr@777: 
ysr@777: class NextNonCSElemFinder: public HeapRegionClosure {
ysr@777:   HeapRegion* _res;
ysr@777: public:
ysr@777:   NextNonCSElemFinder(): _res(NULL) {}
ysr@777:   bool doHeapRegion(HeapRegion* r) {
ysr@777:     if (!r->in_collection_set()) {
ysr@777:       _res = r;
ysr@777:       return true;
ysr@777:     } else {
ysr@777:       return false;
ysr@777:     }
ysr@777:   }
ysr@777:   HeapRegion* res() { return _res; }
ysr@777: };
ysr@777: 
ysr@777: class KnownGarbageClosure: public HeapRegionClosure {
ysr@777:   CollectionSetChooser* _hrSorted;
ysr@777: 
ysr@777: public:
ysr@777:   KnownGarbageClosure(CollectionSetChooser* hrSorted) :
ysr@777:     _hrSorted(hrSorted)
ysr@777:   {}
ysr@777: 
ysr@777:   bool doHeapRegion(HeapRegion* r) {
ysr@777:     // We only include humongous regions in collection
ysr@777:     // sets when concurrent mark shows that their contained object is
ysr@777:     // unreachable.
ysr@777: 
ysr@777:     // Do we have any marking information for this region?
ysr@777:     if (r->is_marked()) {
ysr@777:       // We don't include humongous regions in collection
ysr@777:       // sets because we collect them immediately at the end of a marking
ysr@777:       // cycle.  We also don't include young regions because we *must*
ysr@777:       // include them in the next collection pause.
ysr@777:       if (!r->isHumongous() && !r->is_young()) {
ysr@777:         _hrSorted->addMarkedHeapRegion(r);
ysr@777:       }
ysr@777:     }
ysr@777:     return false;
ysr@777:   }
ysr@777: };
ysr@777: 
ysr@777: class ParKnownGarbageHRClosure: public HeapRegionClosure {
ysr@777:   CollectionSetChooser* _hrSorted;
ysr@777:   jint _marked_regions_added;
ysr@777:   jint _chunk_size;
ysr@777:   jint _cur_chunk_idx;
ysr@777:   jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end)
ysr@777:   int _worker;
ysr@777:   int _invokes;
ysr@777: 
ysr@777:   void get_new_chunk() {
ysr@777:     _cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size);
ysr@777:     _cur_chunk_end = _cur_chunk_idx + _chunk_size;
ysr@777:   }
ysr@777:   void add_region(HeapRegion* r) {
ysr@777:     if (_cur_chunk_idx == _cur_chunk_end) {
ysr@777:       get_new_chunk();
ysr@777:     }
ysr@777:     assert(_cur_chunk_idx < _cur_chunk_end, "postcondition");
ysr@777:     _hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r);
ysr@777:     _marked_regions_added++;
ysr@777:     _cur_chunk_idx++;
ysr@777:   }
ysr@777: 
ysr@777: public:
ysr@777:   ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted,
ysr@777:                            jint chunk_size,
ysr@777:                            int worker) :
ysr@777:     _hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker),
ysr@777:     _marked_regions_added(0), _cur_chunk_idx(0), _cur_chunk_end(0),
ysr@777:     _invokes(0)
ysr@777:   {}
ysr@777: 
ysr@777:   bool doHeapRegion(HeapRegion* r) {
ysr@777:     // We only include humongous regions in collection
ysr@777:     // sets when concurrent mark shows that their contained object is
ysr@777:     // unreachable.
ysr@777:     _invokes++;
ysr@777: 
ysr@777:     // Do we have any marking information for this region?
ysr@777:     if (r->is_marked()) {
ysr@777:       // We don't include humongous regions in collection
ysr@777:       // sets because we collect them immediately at the end of a marking
ysr@777:       // cycle.
ysr@777:       // We also do not include young regions in collection sets
ysr@777:       if (!r->isHumongous() && !r->is_young()) {
ysr@777:         add_region(r);
ysr@777:       }
ysr@777:     }
ysr@777:     return false;
ysr@777:   }
ysr@777:   jint marked_regions_added() { return _marked_regions_added; }
ysr@777:   int invokes() { return _invokes; }
ysr@777: };
ysr@777: 
ysr@777: class ParKnownGarbageTask: public AbstractGangTask {
ysr@777:   CollectionSetChooser* _hrSorted;
ysr@777:   jint _chunk_size;
ysr@777:   G1CollectedHeap* _g1;
ysr@777: public:
ysr@777:   ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) :
ysr@777:     AbstractGangTask("ParKnownGarbageTask"),
ysr@777:     _hrSorted(hrSorted), _chunk_size(chunk_size),
ysr@777:     _g1(G1CollectedHeap::heap())
ysr@777:   {}
ysr@777: 
ysr@777:   void work(int i) {
ysr@777:     ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size, i);
ysr@777:     // Back to zero for the claim value.
tonyp@790:     _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, i,
tonyp@790:                                          HeapRegion::InitialClaimValue);
ysr@777:     jint regions_added = parKnownGarbageCl.marked_regions_added();
ysr@777:     _hrSorted->incNumMarkedHeapRegions(regions_added);
ysr@777:     if (G1PrintParCleanupStats) {
ysr@777:       gclog_or_tty->print("     Thread %d called %d times, added %d regions to list.\n",
ysr@777:                  i, parKnownGarbageCl.invokes(), regions_added);
ysr@777:     }
ysr@777:   }
ysr@777: };
ysr@777: 
ysr@777: void
ysr@777: G1CollectorPolicy_BestRegionsFirst::
ysr@777: record_concurrent_mark_cleanup_end(size_t freed_bytes,
ysr@777:                                    size_t max_live_bytes) {
ysr@777:   double start;
ysr@777:   if (G1PrintParCleanupStats) start = os::elapsedTime();
ysr@777:   record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes);
ysr@777: 
ysr@777:   _collectionSetChooser->clearMarkedHeapRegions();
ysr@777:   double clear_marked_end;
ysr@777:   if (G1PrintParCleanupStats) {
ysr@777:     clear_marked_end = os::elapsedTime();
ysr@777:     gclog_or_tty->print_cr("  clear marked regions + work1: %8.3f ms.",
ysr@777:                   (clear_marked_end - start)*1000.0);
ysr@777:   }
ysr@777:   if (ParallelGCThreads > 0) {
ysr@777:     const size_t OverpartitionFactor = 4;
ysr@777:     const size_t MinChunkSize = 8;
ysr@777:     const size_t ChunkSize =
ysr@777:       MAX2(_g1->n_regions() / (ParallelGCThreads * OverpartitionFactor),
ysr@777:            MinChunkSize);
ysr@777:     _collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(),
ysr@777:                                                              ChunkSize);
ysr@777:     ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser,
ysr@777:                                             (int) ChunkSize);
ysr@777:     _g1->workers()->run_task(&parKnownGarbageTask);
tonyp@790: 
tonyp@790:     assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue),
tonyp@790:            "sanity check");
ysr@777:   } else {
ysr@777:     KnownGarbageClosure knownGarbagecl(_collectionSetChooser);
ysr@777:     _g1->heap_region_iterate(&knownGarbagecl);
ysr@777:   }
ysr@777:   double known_garbage_end;
ysr@777:   if (G1PrintParCleanupStats) {
ysr@777:     known_garbage_end = os::elapsedTime();
ysr@777:     gclog_or_tty->print_cr("  compute known garbage: %8.3f ms.",
ysr@777:                   (known_garbage_end - clear_marked_end)*1000.0);
ysr@777:   }
ysr@777:   _collectionSetChooser->sortMarkedHeapRegions();
ysr@777:   double sort_end;
ysr@777:   if (G1PrintParCleanupStats) {
ysr@777:     sort_end = os::elapsedTime();
ysr@777:     gclog_or_tty->print_cr("  sorting: %8.3f ms.",
ysr@777:                   (sort_end - known_garbage_end)*1000.0);
ysr@777:   }
ysr@777: 
ysr@777:   record_concurrent_mark_cleanup_end_work2();
ysr@777:   double work2_end;
ysr@777:   if (G1PrintParCleanupStats) {
ysr@777:     work2_end = os::elapsedTime();
ysr@777:     gclog_or_tty->print_cr("  work2: %8.3f ms.",
ysr@777:                   (work2_end - sort_end)*1000.0);
ysr@777:   }
ysr@777: }
ysr@777: 
ysr@777: // Add the heap region to the collection set and return the conservative
ysr@777: // estimate of the number of live bytes.
ysr@777: void G1CollectorPolicy::
ysr@777: add_to_collection_set(HeapRegion* hr) {
ysr@777:   if (G1TraceRegions) {
ysr@777:     gclog_or_tty->print_cr("added region to cset %d:["PTR_FORMAT", "PTR_FORMAT"], "
ysr@777:                   "top "PTR_FORMAT", young %s",
ysr@777:                   hr->hrs_index(), hr->bottom(), hr->end(),
ysr@777:                   hr->top(), (hr->is_young()) ? "YES" : "NO");
ysr@777:   }
ysr@777: 
ysr@777:   if (_g1->mark_in_progress())
ysr@777:     _g1->concurrent_mark()->registerCSetRegion(hr);
ysr@777: 
ysr@777:   assert(!hr->in_collection_set(),
ysr@777:               "should not already be in the CSet");
ysr@777:   hr->set_in_collection_set(true);
ysr@777:   hr->set_next_in_collection_set(_collection_set);
ysr@777:   _collection_set = hr;
ysr@777:   _collection_set_size++;
ysr@777:   _collection_set_bytes_used_before += hr->used();
tonyp@961:   _g1->register_region_with_in_cset_fast_test(hr);
ysr@777: }
ysr@777: 
ysr@777: void
ysr@777: G1CollectorPolicy_BestRegionsFirst::
ysr@777: choose_collection_set(HeapRegion* pop_region) {
ysr@777:   double non_young_start_time_sec;
ysr@777:   start_recording_regions();
ysr@777: 
ysr@777:   if (pop_region != NULL) {
ysr@777:     _target_pause_time_ms = (double) G1MaxPauseTimeMS;
ysr@777:   } else {
ysr@777:     guarantee(_target_pause_time_ms > -1.0,
ysr@777:               "_target_pause_time_ms should have been set!");
ysr@777:   }
ysr@777: 
ysr@777:   // pop region is either null (and so is CS), or else it *is* the CS.
ysr@777:   assert(_collection_set == pop_region, "Precondition");
ysr@777: 
ysr@777:   double base_time_ms = predict_base_elapsed_time_ms(_pending_cards);
ysr@777:   double predicted_pause_time_ms = base_time_ms;
ysr@777: 
ysr@777:   double target_time_ms = _target_pause_time_ms;
ysr@777:   double time_remaining_ms = target_time_ms - base_time_ms;
ysr@777: 
ysr@777:   // the 10% and 50% values are arbitrary...
ysr@777:   if (time_remaining_ms < 0.10*target_time_ms) {
ysr@777:     time_remaining_ms = 0.50 * target_time_ms;
ysr@777:     _within_target = false;
ysr@777:   } else {
ysr@777:     _within_target = true;
ysr@777:   }
ysr@777: 
ysr@777:   // We figure out the number of bytes available for future to-space.
ysr@777:   // For new regions without marking information, we must assume the
ysr@777:   // worst-case of complete survival.  If we have marking information for a
ysr@777:   // region, we can bound the amount of live data.  We can add a number of
ysr@777:   // such regions, as long as the sum of the live data bounds does not
ysr@777:   // exceed the available evacuation space.
ysr@777:   size_t max_live_bytes = _g1->free_regions() * HeapRegion::GrainBytes;
ysr@777: 
ysr@777:   size_t expansion_bytes =
ysr@777:     _g1->expansion_regions() * HeapRegion::GrainBytes;
ysr@777: 
ysr@777:   if (pop_region == NULL) {
ysr@777:     _collection_set_bytes_used_before = 0;
ysr@777:     _collection_set_size = 0;
ysr@777:   }
ysr@777: 
ysr@777:   // Adjust for expansion and slop.
ysr@777:   max_live_bytes = max_live_bytes + expansion_bytes;
ysr@777: 
ysr@777:   assert(pop_region != NULL || _g1->regions_accounted_for(), "Region leakage!");
ysr@777: 
ysr@777:   HeapRegion* hr;
ysr@777:   if (in_young_gc_mode()) {
ysr@777:     double young_start_time_sec = os::elapsedTime();
ysr@777: 
ysr@777:     if (G1PolicyVerbose > 0) {
ysr@777:       gclog_or_tty->print_cr("Adding %d young regions to the CSet",
ysr@777:                     _g1->young_list_length());
ysr@777:     }
ysr@777:     _young_cset_length  = 0;
ysr@777:     _last_young_gc_full = full_young_gcs() ? true : false;
ysr@777:     if (_last_young_gc_full)
ysr@777:       ++_full_young_pause_num;
ysr@777:     else
ysr@777:       ++_partial_young_pause_num;
ysr@777:     hr = _g1->pop_region_from_young_list();
ysr@777:     while (hr != NULL) {
ysr@777: 
ysr@777:       assert( hr->young_index_in_cset() == -1, "invariant" );
ysr@777:       assert( hr->age_in_surv_rate_group() != -1, "invariant" );
ysr@777:       hr->set_young_index_in_cset((int) _young_cset_length);
ysr@777: 
ysr@777:       ++_young_cset_length;
ysr@777:       double predicted_time_ms = predict_region_elapsed_time_ms(hr, true);
ysr@777:       time_remaining_ms -= predicted_time_ms;
ysr@777:       predicted_pause_time_ms += predicted_time_ms;
ysr@777:       if (hr == pop_region) {
ysr@777:         // The popular region was young.  Skip over it.
ysr@777:         assert(hr->in_collection_set(), "It's the pop region.");
ysr@777:       } else {
ysr@777:         assert(!hr->in_collection_set(), "It's not the pop region.");
ysr@777:         add_to_collection_set(hr);
ysr@777:         record_cset_region(hr, true);
ysr@777:       }
ysr@777:       max_live_bytes -= MIN2(hr->max_live_bytes(), max_live_bytes);
ysr@777:       if (G1PolicyVerbose > 0) {
ysr@777:         gclog_or_tty->print_cr("  Added [" PTR_FORMAT ", " PTR_FORMAT") to CS.",
ysr@777:                       hr->bottom(), hr->end());
ysr@777:         gclog_or_tty->print_cr("    (" SIZE_FORMAT " KB left in heap.)",
ysr@777:                       max_live_bytes/K);
ysr@777:       }
ysr@777:       hr = _g1->pop_region_from_young_list();
ysr@777:     }
ysr@777: 
ysr@777:     record_scan_only_regions(_g1->young_list_scan_only_length());
ysr@777: 
ysr@777:     double young_end_time_sec = os::elapsedTime();
ysr@777:     _recorded_young_cset_choice_time_ms =
ysr@777:       (young_end_time_sec - young_start_time_sec) * 1000.0;
ysr@777: 
ysr@777:     non_young_start_time_sec = os::elapsedTime();
ysr@777: 
ysr@777:     if (_young_cset_length > 0 && _last_young_gc_full) {
ysr@777:       // don't bother adding more regions...
ysr@777:       goto choose_collection_set_end;
ysr@777:     }
ysr@777:   } else if (pop_region != NULL) {
ysr@777:     // We're not in young mode, and we chose a popular region; don't choose
ysr@777:     // any more.
ysr@777:     return;
ysr@777:   }
ysr@777: 
ysr@777:   if (!in_young_gc_mode() || !full_young_gcs()) {
ysr@777:     bool should_continue = true;
ysr@777:     NumberSeq seq;
ysr@777:     double avg_prediction = 100000000000000000.0; // something very large
ysr@777:     do {
ysr@777:       hr = _collectionSetChooser->getNextMarkedRegion(time_remaining_ms,
ysr@777:                                                       avg_prediction);
ysr@777:       if (hr != NULL && !hr->popular()) {
ysr@777:         double predicted_time_ms = predict_region_elapsed_time_ms(hr, false);
ysr@777:         time_remaining_ms -= predicted_time_ms;
ysr@777:         predicted_pause_time_ms += predicted_time_ms;
ysr@777:         add_to_collection_set(hr);
ysr@777:         record_cset_region(hr, false);
ysr@777:         max_live_bytes -= MIN2(hr->max_live_bytes(), max_live_bytes);
ysr@777:         if (G1PolicyVerbose > 0) {
ysr@777:           gclog_or_tty->print_cr("    (" SIZE_FORMAT " KB left in heap.)",
ysr@777:                         max_live_bytes/K);
ysr@777:         }
ysr@777:         seq.add(predicted_time_ms);
ysr@777:         avg_prediction = seq.avg() + seq.sd();
ysr@777:       }
ysr@777:       should_continue =
ysr@777:         ( hr != NULL) &&
ysr@777:         ( (adaptive_young_list_length()) ? time_remaining_ms > 0.0
ysr@777:           : _collection_set_size < _young_list_fixed_length );
ysr@777:     } while (should_continue);
ysr@777: 
ysr@777:     if (!adaptive_young_list_length() &&
ysr@777:         _collection_set_size < _young_list_fixed_length)
ysr@777:       _should_revert_to_full_young_gcs  = true;
ysr@777:   }
ysr@777: 
ysr@777: choose_collection_set_end:
ysr@777:   count_CS_bytes_used();
ysr@777: 
ysr@777:   end_recording_regions();
ysr@777: 
ysr@777:   double non_young_end_time_sec = os::elapsedTime();
ysr@777:   _recorded_non_young_cset_choice_time_ms =
ysr@777:     (non_young_end_time_sec - non_young_start_time_sec) * 1000.0;
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy_BestRegionsFirst::record_full_collection_end() {
ysr@777:   G1CollectorPolicy::record_full_collection_end();
ysr@777:   _collectionSetChooser->updateAfterFullCollection();
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy_BestRegionsFirst::
ysr@777: expand_if_possible(size_t numRegions) {
ysr@777:   size_t expansion_bytes = numRegions * HeapRegion::GrainBytes;
ysr@777:   _g1->expand(expansion_bytes);
ysr@777: }
ysr@777: 
ysr@777: void G1CollectorPolicy_BestRegionsFirst::
ysr@777: record_collection_pause_end(bool popular, bool abandoned) {
ysr@777:   G1CollectorPolicy::record_collection_pause_end(popular, abandoned);
ysr@777:   assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end.");
ysr@777: }
ysr@777: 
ysr@777: // Local Variables: ***
ysr@777: // c-indentation-style: gnu ***
ysr@777: // End: ***