Thu, 11 Feb 2010 15:52:19 -0800
6923991: G1: improve scalability of RSet scanning
Summary: Implemented block-based work stealing. Moved copying during the rset scanning phase to the main copying phase. Made the size of rset table depend on the region size.
Reviewed-by: apetrusenko, tonyp
ysr@777 | 1 | /* |
xdono@1014 | 2 | * Copyright 2001-2009 Sun Microsystems, Inc. All Rights Reserved. |
ysr@777 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
ysr@777 | 4 | * |
ysr@777 | 5 | * This code is free software; you can redistribute it and/or modify it |
ysr@777 | 6 | * under the terms of the GNU General Public License version 2 only, as |
ysr@777 | 7 | * published by the Free Software Foundation. |
ysr@777 | 8 | * |
ysr@777 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
ysr@777 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
ysr@777 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
ysr@777 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
ysr@777 | 13 | * accompanied this code). |
ysr@777 | 14 | * |
ysr@777 | 15 | * You should have received a copy of the GNU General Public License version |
ysr@777 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
ysr@777 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
ysr@777 | 18 | * |
ysr@777 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
ysr@777 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
ysr@777 | 21 | * have any questions. |
ysr@777 | 22 | * |
ysr@777 | 23 | */ |
ysr@777 | 24 | |
ysr@777 | 25 | #include "incls/_precompiled.incl" |
ysr@777 | 26 | #include "incls/_g1CollectorPolicy.cpp.incl" |
ysr@777 | 27 | |
ysr@777 | 28 | #define PREDICTIONS_VERBOSE 0 |
ysr@777 | 29 | |
ysr@777 | 30 | // <NEW PREDICTION> |
ysr@777 | 31 | |
ysr@777 | 32 | // Different defaults for different number of GC threads |
ysr@777 | 33 | // They were chosen by running GCOld and SPECjbb on debris with different |
ysr@777 | 34 | // numbers of GC threads and choosing them based on the results |
ysr@777 | 35 | |
ysr@777 | 36 | // all the same |
ysr@777 | 37 | static double rs_length_diff_defaults[] = { |
ysr@777 | 38 | 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 |
ysr@777 | 39 | }; |
ysr@777 | 40 | |
ysr@777 | 41 | static double cost_per_card_ms_defaults[] = { |
ysr@777 | 42 | 0.01, 0.005, 0.005, 0.003, 0.003, 0.002, 0.002, 0.0015 |
ysr@777 | 43 | }; |
ysr@777 | 44 | |
ysr@777 | 45 | static double cost_per_scan_only_region_ms_defaults[] = { |
ysr@777 | 46 | 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 |
ysr@777 | 47 | }; |
ysr@777 | 48 | |
ysr@777 | 49 | // all the same |
ysr@777 | 50 | static double fully_young_cards_per_entry_ratio_defaults[] = { |
ysr@777 | 51 | 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 |
ysr@777 | 52 | }; |
ysr@777 | 53 | |
ysr@777 | 54 | static double cost_per_entry_ms_defaults[] = { |
ysr@777 | 55 | 0.015, 0.01, 0.01, 0.008, 0.008, 0.0055, 0.0055, 0.005 |
ysr@777 | 56 | }; |
ysr@777 | 57 | |
ysr@777 | 58 | static double cost_per_byte_ms_defaults[] = { |
ysr@777 | 59 | 0.00006, 0.00003, 0.00003, 0.000015, 0.000015, 0.00001, 0.00001, 0.000009 |
ysr@777 | 60 | }; |
ysr@777 | 61 | |
ysr@777 | 62 | // these should be pretty consistent |
ysr@777 | 63 | static double constant_other_time_ms_defaults[] = { |
ysr@777 | 64 | 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0 |
ysr@777 | 65 | }; |
ysr@777 | 66 | |
ysr@777 | 67 | |
ysr@777 | 68 | static double young_other_cost_per_region_ms_defaults[] = { |
ysr@777 | 69 | 0.3, 0.2, 0.2, 0.15, 0.15, 0.12, 0.12, 0.1 |
ysr@777 | 70 | }; |
ysr@777 | 71 | |
ysr@777 | 72 | static double non_young_other_cost_per_region_ms_defaults[] = { |
ysr@777 | 73 | 1.0, 0.7, 0.7, 0.5, 0.5, 0.42, 0.42, 0.30 |
ysr@777 | 74 | }; |
ysr@777 | 75 | |
ysr@777 | 76 | // </NEW PREDICTION> |
ysr@777 | 77 | |
ysr@777 | 78 | G1CollectorPolicy::G1CollectorPolicy() : |
ysr@777 | 79 | _parallel_gc_threads((ParallelGCThreads > 0) ? ParallelGCThreads : 1), |
ysr@777 | 80 | _n_pauses(0), |
ysr@777 | 81 | _recent_CH_strong_roots_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
ysr@777 | 82 | _recent_G1_strong_roots_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
ysr@777 | 83 | _recent_evac_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
ysr@777 | 84 | _recent_pause_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
ysr@777 | 85 | _recent_rs_sizes(new TruncatedSeq(NumPrevPausesForHeuristics)), |
ysr@777 | 86 | _recent_gc_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
ysr@777 | 87 | _all_pause_times_ms(new NumberSeq()), |
ysr@777 | 88 | _stop_world_start(0.0), |
ysr@777 | 89 | _all_stop_world_times_ms(new NumberSeq()), |
ysr@777 | 90 | _all_yield_times_ms(new NumberSeq()), |
ysr@777 | 91 | |
ysr@777 | 92 | _all_mod_union_times_ms(new NumberSeq()), |
ysr@777 | 93 | |
apetrusenko@1112 | 94 | _summary(new Summary()), |
apetrusenko@1112 | 95 | _abandoned_summary(new AbandonedSummary()), |
ysr@777 | 96 | |
johnc@1325 | 97 | #ifndef PRODUCT |
ysr@777 | 98 | _cur_clear_ct_time_ms(0.0), |
johnc@1325 | 99 | _min_clear_cc_time_ms(-1.0), |
johnc@1325 | 100 | _max_clear_cc_time_ms(-1.0), |
johnc@1325 | 101 | _cur_clear_cc_time_ms(0.0), |
johnc@1325 | 102 | _cum_clear_cc_time_ms(0.0), |
johnc@1325 | 103 | _num_cc_clears(0L), |
johnc@1325 | 104 | #endif |
ysr@777 | 105 | |
ysr@777 | 106 | _region_num_young(0), |
ysr@777 | 107 | _region_num_tenured(0), |
ysr@777 | 108 | _prev_region_num_young(0), |
ysr@777 | 109 | _prev_region_num_tenured(0), |
ysr@777 | 110 | |
ysr@777 | 111 | _aux_num(10), |
ysr@777 | 112 | _all_aux_times_ms(new NumberSeq[_aux_num]), |
ysr@777 | 113 | _cur_aux_start_times_ms(new double[_aux_num]), |
ysr@777 | 114 | _cur_aux_times_ms(new double[_aux_num]), |
ysr@777 | 115 | _cur_aux_times_set(new bool[_aux_num]), |
ysr@777 | 116 | |
ysr@777 | 117 | _concurrent_mark_init_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
ysr@777 | 118 | _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
ysr@777 | 119 | _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
ysr@777 | 120 | |
ysr@777 | 121 | // <NEW PREDICTION> |
ysr@777 | 122 | |
ysr@777 | 123 | _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 124 | _prev_collection_pause_end_ms(0.0), |
ysr@777 | 125 | _pending_card_diff_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 126 | _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 127 | _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 128 | _cost_per_scan_only_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 129 | _fully_young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 130 | _partially_young_cards_per_entry_ratio_seq( |
ysr@777 | 131 | new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 132 | _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 133 | _partially_young_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 134 | _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 135 | _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 136 | _cost_per_scan_only_region_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 137 | _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 138 | _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 139 | _non_young_other_cost_per_region_ms_seq( |
ysr@777 | 140 | new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 141 | |
ysr@777 | 142 | _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 143 | _scanned_cards_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 144 | _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 145 | |
johnc@1186 | 146 | _pause_time_target_ms((double) MaxGCPauseMillis), |
ysr@777 | 147 | |
ysr@777 | 148 | // </NEW PREDICTION> |
ysr@777 | 149 | |
ysr@777 | 150 | _in_young_gc_mode(false), |
ysr@777 | 151 | _full_young_gcs(true), |
ysr@777 | 152 | _full_young_pause_num(0), |
ysr@777 | 153 | _partial_young_pause_num(0), |
ysr@777 | 154 | |
ysr@777 | 155 | _during_marking(false), |
ysr@777 | 156 | _in_marking_window(false), |
ysr@777 | 157 | _in_marking_window_im(false), |
ysr@777 | 158 | |
ysr@777 | 159 | _known_garbage_ratio(0.0), |
ysr@777 | 160 | _known_garbage_bytes(0), |
ysr@777 | 161 | |
ysr@777 | 162 | _young_gc_eff_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 163 | _target_pause_time_ms(-1.0), |
ysr@777 | 164 | |
ysr@777 | 165 | _recent_prev_end_times_for_all_gcs_sec(new TruncatedSeq(NumPrevPausesForHeuristics)), |
ysr@777 | 166 | |
ysr@777 | 167 | _recent_CS_bytes_used_before(new TruncatedSeq(NumPrevPausesForHeuristics)), |
ysr@777 | 168 | _recent_CS_bytes_surviving(new TruncatedSeq(NumPrevPausesForHeuristics)), |
ysr@777 | 169 | |
ysr@777 | 170 | _recent_avg_pause_time_ratio(0.0), |
ysr@777 | 171 | _num_markings(0), |
ysr@777 | 172 | _n_marks(0), |
ysr@777 | 173 | _n_pauses_at_mark_end(0), |
ysr@777 | 174 | |
ysr@777 | 175 | _all_full_gc_times_ms(new NumberSeq()), |
ysr@777 | 176 | |
ysr@777 | 177 | // G1PausesBtwnConcMark defaults to -1 |
ysr@777 | 178 | // so the hack is to do the cast QQQ FIXME |
ysr@777 | 179 | _pauses_btwn_concurrent_mark((size_t)G1PausesBtwnConcMark), |
ysr@777 | 180 | _n_marks_since_last_pause(0), |
ysr@777 | 181 | _conc_mark_initiated(false), |
ysr@777 | 182 | _should_initiate_conc_mark(false), |
ysr@777 | 183 | _should_revert_to_full_young_gcs(false), |
ysr@777 | 184 | _last_full_young_gc(false), |
ysr@777 | 185 | |
ysr@777 | 186 | _prev_collection_pause_used_at_end_bytes(0), |
ysr@777 | 187 | |
ysr@777 | 188 | _collection_set(NULL), |
ysr@777 | 189 | #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
ysr@777 | 190 | #pragma warning( disable:4355 ) // 'this' : used in base member initializer list |
ysr@777 | 191 | #endif // _MSC_VER |
ysr@777 | 192 | |
ysr@777 | 193 | _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", |
ysr@777 | 194 | G1YoungSurvRateNumRegionsSummary)), |
ysr@777 | 195 | _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", |
apetrusenko@980 | 196 | G1YoungSurvRateNumRegionsSummary)), |
ysr@777 | 197 | // add here any more surv rate groups |
apetrusenko@980 | 198 | _recorded_survivor_regions(0), |
apetrusenko@980 | 199 | _recorded_survivor_head(NULL), |
apetrusenko@980 | 200 | _recorded_survivor_tail(NULL), |
apetrusenko@980 | 201 | _survivors_age_table(true) |
apetrusenko@980 | 202 | |
ysr@777 | 203 | { |
tonyp@1377 | 204 | // Set up the region size and associated fields. Given that the |
tonyp@1377 | 205 | // policy is created before the heap, we have to set this up here, |
tonyp@1377 | 206 | // so it's done as soon as possible. |
tonyp@1377 | 207 | HeapRegion::setup_heap_region_size(Arguments::min_heap_size()); |
iveresov@1696 | 208 | HeapRegionRemSet::setup_remset_size(); |
tonyp@1377 | 209 | |
ysr@777 | 210 | _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
ysr@777 | 211 | _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; |
ysr@777 | 212 | |
ysr@777 | 213 | _par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads]; |
ysr@777 | 214 | _par_last_mark_stack_scan_times_ms = new double[_parallel_gc_threads]; |
ysr@777 | 215 | _par_last_scan_only_times_ms = new double[_parallel_gc_threads]; |
ysr@777 | 216 | _par_last_scan_only_regions_scanned = new double[_parallel_gc_threads]; |
ysr@777 | 217 | |
ysr@777 | 218 | _par_last_update_rs_start_times_ms = new double[_parallel_gc_threads]; |
ysr@777 | 219 | _par_last_update_rs_times_ms = new double[_parallel_gc_threads]; |
ysr@777 | 220 | _par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; |
ysr@777 | 221 | |
ysr@777 | 222 | _par_last_scan_rs_start_times_ms = new double[_parallel_gc_threads]; |
ysr@777 | 223 | _par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; |
ysr@777 | 224 | _par_last_scan_new_refs_times_ms = new double[_parallel_gc_threads]; |
ysr@777 | 225 | |
ysr@777 | 226 | _par_last_obj_copy_times_ms = new double[_parallel_gc_threads]; |
ysr@777 | 227 | |
ysr@777 | 228 | _par_last_termination_times_ms = new double[_parallel_gc_threads]; |
ysr@777 | 229 | |
ysr@777 | 230 | // start conservatively |
johnc@1186 | 231 | _expensive_region_limit_ms = 0.5 * (double) MaxGCPauseMillis; |
ysr@777 | 232 | |
ysr@777 | 233 | // <NEW PREDICTION> |
ysr@777 | 234 | |
ysr@777 | 235 | int index; |
ysr@777 | 236 | if (ParallelGCThreads == 0) |
ysr@777 | 237 | index = 0; |
ysr@777 | 238 | else if (ParallelGCThreads > 8) |
ysr@777 | 239 | index = 7; |
ysr@777 | 240 | else |
ysr@777 | 241 | index = ParallelGCThreads - 1; |
ysr@777 | 242 | |
ysr@777 | 243 | _pending_card_diff_seq->add(0.0); |
ysr@777 | 244 | _rs_length_diff_seq->add(rs_length_diff_defaults[index]); |
ysr@777 | 245 | _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); |
ysr@777 | 246 | _cost_per_scan_only_region_ms_seq->add( |
ysr@777 | 247 | cost_per_scan_only_region_ms_defaults[index]); |
ysr@777 | 248 | _fully_young_cards_per_entry_ratio_seq->add( |
ysr@777 | 249 | fully_young_cards_per_entry_ratio_defaults[index]); |
ysr@777 | 250 | _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); |
ysr@777 | 251 | _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); |
ysr@777 | 252 | _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); |
ysr@777 | 253 | _young_other_cost_per_region_ms_seq->add( |
ysr@777 | 254 | young_other_cost_per_region_ms_defaults[index]); |
ysr@777 | 255 | _non_young_other_cost_per_region_ms_seq->add( |
ysr@777 | 256 | non_young_other_cost_per_region_ms_defaults[index]); |
ysr@777 | 257 | |
ysr@777 | 258 | // </NEW PREDICTION> |
ysr@777 | 259 | |
johnc@1186 | 260 | double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
johnc@1186 | 261 | double max_gc_time = (double) MaxGCPauseMillis / 1000.0; |
ysr@777 | 262 | guarantee(max_gc_time < time_slice, |
ysr@777 | 263 | "Max GC time should not be greater than the time slice"); |
ysr@777 | 264 | _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); |
johnc@1186 | 265 | _sigma = (double) G1ConfidencePercent / 100.0; |
ysr@777 | 266 | |
ysr@777 | 267 | // start conservatively (around 50ms is about right) |
ysr@777 | 268 | _concurrent_mark_init_times_ms->add(0.05); |
ysr@777 | 269 | _concurrent_mark_remark_times_ms->add(0.05); |
ysr@777 | 270 | _concurrent_mark_cleanup_times_ms->add(0.20); |
ysr@777 | 271 | _tenuring_threshold = MaxTenuringThreshold; |
ysr@777 | 272 | |
johnc@1186 | 273 | if (G1UseSurvivorSpaces) { |
apetrusenko@980 | 274 | // if G1FixedSurvivorSpaceSize is 0 which means the size is not |
apetrusenko@980 | 275 | // fixed, then _max_survivor_regions will be calculated at |
apetrusenko@982 | 276 | // calculate_young_list_target_config during initialization |
apetrusenko@980 | 277 | _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
apetrusenko@980 | 278 | } else { |
apetrusenko@980 | 279 | _max_survivor_regions = 0; |
apetrusenko@980 | 280 | } |
apetrusenko@980 | 281 | |
ysr@777 | 282 | initialize_all(); |
ysr@777 | 283 | } |
ysr@777 | 284 | |
ysr@777 | 285 | // Increment "i", mod "len" |
ysr@777 | 286 | static void inc_mod(int& i, int len) { |
ysr@777 | 287 | i++; if (i == len) i = 0; |
ysr@777 | 288 | } |
ysr@777 | 289 | |
ysr@777 | 290 | void G1CollectorPolicy::initialize_flags() { |
ysr@777 | 291 | set_min_alignment(HeapRegion::GrainBytes); |
ysr@777 | 292 | set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); |
apetrusenko@982 | 293 | if (SurvivorRatio < 1) { |
apetrusenko@982 | 294 | vm_exit_during_initialization("Invalid survivor ratio specified"); |
apetrusenko@982 | 295 | } |
ysr@777 | 296 | CollectorPolicy::initialize_flags(); |
ysr@777 | 297 | } |
ysr@777 | 298 | |
ysr@777 | 299 | void G1CollectorPolicy::init() { |
ysr@777 | 300 | // Set aside an initial future to_space. |
ysr@777 | 301 | _g1 = G1CollectedHeap::heap(); |
ysr@777 | 302 | size_t regions = Universe::heap()->capacity() / HeapRegion::GrainBytes; |
ysr@777 | 303 | |
ysr@777 | 304 | assert(Heap_lock->owned_by_self(), "Locking discipline."); |
ysr@777 | 305 | |
ysr@777 | 306 | if (G1SteadyStateUsed < 50) { |
ysr@777 | 307 | vm_exit_during_initialization("G1SteadyStateUsed must be at least 50%."); |
ysr@777 | 308 | } |
ysr@777 | 309 | |
apetrusenko@980 | 310 | initialize_gc_policy_counters(); |
apetrusenko@980 | 311 | |
ysr@777 | 312 | if (G1Gen) { |
ysr@777 | 313 | _in_young_gc_mode = true; |
ysr@777 | 314 | |
ysr@777 | 315 | if (G1YoungGenSize == 0) { |
ysr@777 | 316 | set_adaptive_young_list_length(true); |
ysr@777 | 317 | _young_list_fixed_length = 0; |
ysr@777 | 318 | } else { |
ysr@777 | 319 | set_adaptive_young_list_length(false); |
ysr@777 | 320 | _young_list_fixed_length = (G1YoungGenSize / HeapRegion::GrainBytes); |
ysr@777 | 321 | } |
ysr@777 | 322 | _free_regions_at_end_of_collection = _g1->free_regions(); |
ysr@777 | 323 | _scan_only_regions_at_end_of_collection = 0; |
ysr@777 | 324 | calculate_young_list_min_length(); |
ysr@777 | 325 | guarantee( _young_list_min_length == 0, "invariant, not enough info" ); |
ysr@777 | 326 | calculate_young_list_target_config(); |
ysr@777 | 327 | } else { |
ysr@777 | 328 | _young_list_fixed_length = 0; |
ysr@777 | 329 | _in_young_gc_mode = false; |
ysr@777 | 330 | } |
ysr@777 | 331 | } |
ysr@777 | 332 | |
apetrusenko@980 | 333 | // Create the jstat counters for the policy. |
apetrusenko@980 | 334 | void G1CollectorPolicy::initialize_gc_policy_counters() |
apetrusenko@980 | 335 | { |
apetrusenko@980 | 336 | _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 2 + G1Gen); |
apetrusenko@980 | 337 | } |
apetrusenko@980 | 338 | |
ysr@777 | 339 | void G1CollectorPolicy::calculate_young_list_min_length() { |
ysr@777 | 340 | _young_list_min_length = 0; |
ysr@777 | 341 | |
ysr@777 | 342 | if (!adaptive_young_list_length()) |
ysr@777 | 343 | return; |
ysr@777 | 344 | |
ysr@777 | 345 | if (_alloc_rate_ms_seq->num() > 3) { |
ysr@777 | 346 | double now_sec = os::elapsedTime(); |
ysr@777 | 347 | double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; |
ysr@777 | 348 | double alloc_rate_ms = predict_alloc_rate_ms(); |
ysr@777 | 349 | int min_regions = (int) ceil(alloc_rate_ms * when_ms); |
ysr@777 | 350 | int current_region_num = (int) _g1->young_list_length(); |
ysr@777 | 351 | _young_list_min_length = min_regions + current_region_num; |
ysr@777 | 352 | } |
ysr@777 | 353 | } |
ysr@777 | 354 | |
ysr@777 | 355 | void G1CollectorPolicy::calculate_young_list_target_config() { |
ysr@777 | 356 | if (adaptive_young_list_length()) { |
ysr@777 | 357 | size_t rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); |
ysr@777 | 358 | calculate_young_list_target_config(rs_lengths); |
ysr@777 | 359 | } else { |
ysr@777 | 360 | if (full_young_gcs()) |
ysr@777 | 361 | _young_list_target_length = _young_list_fixed_length; |
ysr@777 | 362 | else |
ysr@777 | 363 | _young_list_target_length = _young_list_fixed_length / 2; |
ysr@777 | 364 | _young_list_target_length = MAX2(_young_list_target_length, (size_t)1); |
ysr@777 | 365 | size_t so_length = calculate_optimal_so_length(_young_list_target_length); |
ysr@777 | 366 | guarantee( so_length < _young_list_target_length, "invariant" ); |
ysr@777 | 367 | _young_list_so_prefix_length = so_length; |
ysr@777 | 368 | } |
apetrusenko@980 | 369 | calculate_survivors_policy(); |
ysr@777 | 370 | } |
ysr@777 | 371 | |
ysr@777 | 372 | // This method calculate the optimal scan-only set for a fixed young |
ysr@777 | 373 | // gen size. I couldn't work out how to reuse the more elaborate one, |
ysr@777 | 374 | // i.e. calculate_young_list_target_config(rs_length), as the loops are |
ysr@777 | 375 | // fundamentally different (the other one finds a config for different |
ysr@777 | 376 | // S-O lengths, whereas here we need to do the opposite). |
ysr@777 | 377 | size_t G1CollectorPolicy::calculate_optimal_so_length( |
ysr@777 | 378 | size_t young_list_length) { |
ysr@777 | 379 | if (!G1UseScanOnlyPrefix) |
ysr@777 | 380 | return 0; |
ysr@777 | 381 | |
ysr@777 | 382 | if (_all_pause_times_ms->num() < 3) { |
ysr@777 | 383 | // we won't use a scan-only set at the beginning to allow the rest |
ysr@777 | 384 | // of the predictors to warm up |
ysr@777 | 385 | return 0; |
ysr@777 | 386 | } |
ysr@777 | 387 | |
ysr@777 | 388 | if (_cost_per_scan_only_region_ms_seq->num() < 3) { |
ysr@777 | 389 | // then, we'll only set the S-O set to 1 for a little bit of time, |
ysr@777 | 390 | // to get enough information on the scanning cost |
ysr@777 | 391 | return 1; |
ysr@777 | 392 | } |
ysr@777 | 393 | |
ysr@777 | 394 | size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); |
ysr@777 | 395 | size_t rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); |
ysr@777 | 396 | size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); |
ysr@777 | 397 | size_t scanned_cards; |
ysr@777 | 398 | if (full_young_gcs()) |
ysr@777 | 399 | scanned_cards = predict_young_card_num(adj_rs_lengths); |
ysr@777 | 400 | else |
ysr@777 | 401 | scanned_cards = predict_non_young_card_num(adj_rs_lengths); |
ysr@777 | 402 | double base_time_ms = predict_base_elapsed_time_ms(pending_cards, |
ysr@777 | 403 | scanned_cards); |
ysr@777 | 404 | |
ysr@777 | 405 | size_t so_length = 0; |
ysr@777 | 406 | double max_gc_eff = 0.0; |
ysr@777 | 407 | for (size_t i = 0; i < young_list_length; ++i) { |
ysr@777 | 408 | double gc_eff = 0.0; |
ysr@777 | 409 | double pause_time_ms = 0.0; |
ysr@777 | 410 | predict_gc_eff(young_list_length, i, base_time_ms, |
ysr@777 | 411 | &gc_eff, &pause_time_ms); |
ysr@777 | 412 | if (gc_eff > max_gc_eff) { |
ysr@777 | 413 | max_gc_eff = gc_eff; |
ysr@777 | 414 | so_length = i; |
ysr@777 | 415 | } |
ysr@777 | 416 | } |
ysr@777 | 417 | |
ysr@777 | 418 | // set it to 95% of the optimal to make sure we sample the "area" |
ysr@777 | 419 | // around the optimal length to get up-to-date survival rate data |
ysr@777 | 420 | return so_length * 950 / 1000; |
ysr@777 | 421 | } |
ysr@777 | 422 | |
ysr@777 | 423 | // This is a really cool piece of code! It finds the best |
ysr@777 | 424 | // target configuration (young length / scan-only prefix length) so |
ysr@777 | 425 | // that GC efficiency is maximized and that we also meet a pause |
ysr@777 | 426 | // time. It's a triple nested loop. These loops are explained below |
ysr@777 | 427 | // from the inside-out :-) |
ysr@777 | 428 | // |
ysr@777 | 429 | // (a) The innermost loop will try to find the optimal young length |
ysr@777 | 430 | // for a fixed S-O length. It uses a binary search to speed up the |
ysr@777 | 431 | // process. We assume that, for a fixed S-O length, as we add more |
ysr@777 | 432 | // young regions to the CSet, the GC efficiency will only go up (I'll |
ysr@777 | 433 | // skip the proof). So, using a binary search to optimize this process |
ysr@777 | 434 | // makes perfect sense. |
ysr@777 | 435 | // |
ysr@777 | 436 | // (b) The middle loop will fix the S-O length before calling the |
ysr@777 | 437 | // innermost one. It will vary it between two parameters, increasing |
ysr@777 | 438 | // it by a given increment. |
ysr@777 | 439 | // |
ysr@777 | 440 | // (c) The outermost loop will call the middle loop three times. |
ysr@777 | 441 | // (1) The first time it will explore all possible S-O length values |
ysr@777 | 442 | // from 0 to as large as it can get, using a coarse increment (to |
ysr@777 | 443 | // quickly "home in" to where the optimal seems to be). |
ysr@777 | 444 | // (2) The second time it will explore the values around the optimal |
ysr@777 | 445 | // that was found by the first iteration using a fine increment. |
ysr@777 | 446 | // (3) Once the optimal config has been determined by the second |
ysr@777 | 447 | // iteration, we'll redo the calculation, but setting the S-O length |
ysr@777 | 448 | // to 95% of the optimal to make sure we sample the "area" |
ysr@777 | 449 | // around the optimal length to get up-to-date survival rate data |
ysr@777 | 450 | // |
ysr@777 | 451 | // Termination conditions for the iterations are several: the pause |
ysr@777 | 452 | // time is over the limit, we do not have enough to-space, etc. |
ysr@777 | 453 | |
ysr@777 | 454 | void G1CollectorPolicy::calculate_young_list_target_config(size_t rs_lengths) { |
ysr@777 | 455 | guarantee( adaptive_young_list_length(), "pre-condition" ); |
ysr@777 | 456 | |
ysr@777 | 457 | double start_time_sec = os::elapsedTime(); |
johnc@1186 | 458 | size_t min_reserve_perc = MAX2((size_t)2, (size_t)G1MinReservePercent); |
ysr@777 | 459 | min_reserve_perc = MIN2((size_t) 50, min_reserve_perc); |
ysr@777 | 460 | size_t reserve_regions = |
ysr@777 | 461 | (size_t) ((double) min_reserve_perc * (double) _g1->n_regions() / 100.0); |
ysr@777 | 462 | |
ysr@777 | 463 | if (full_young_gcs() && _free_regions_at_end_of_collection > 0) { |
ysr@777 | 464 | // we are in fully-young mode and there are free regions in the heap |
ysr@777 | 465 | |
apetrusenko@980 | 466 | double survivor_regions_evac_time = |
apetrusenko@980 | 467 | predict_survivor_regions_evac_time(); |
apetrusenko@980 | 468 | |
ysr@777 | 469 | size_t min_so_length = 0; |
ysr@777 | 470 | size_t max_so_length = 0; |
ysr@777 | 471 | |
ysr@777 | 472 | if (G1UseScanOnlyPrefix) { |
ysr@777 | 473 | if (_all_pause_times_ms->num() < 3) { |
ysr@777 | 474 | // we won't use a scan-only set at the beginning to allow the rest |
ysr@777 | 475 | // of the predictors to warm up |
ysr@777 | 476 | min_so_length = 0; |
ysr@777 | 477 | max_so_length = 0; |
ysr@777 | 478 | } else if (_cost_per_scan_only_region_ms_seq->num() < 3) { |
ysr@777 | 479 | // then, we'll only set the S-O set to 1 for a little bit of time, |
ysr@777 | 480 | // to get enough information on the scanning cost |
ysr@777 | 481 | min_so_length = 1; |
ysr@777 | 482 | max_so_length = 1; |
ysr@777 | 483 | } else if (_in_marking_window || _last_full_young_gc) { |
ysr@777 | 484 | // no S-O prefix during a marking phase either, as at the end |
ysr@777 | 485 | // of the marking phase we'll have to use a very small young |
ysr@777 | 486 | // length target to fill up the rest of the CSet with |
ysr@777 | 487 | // non-young regions and, if we have lots of scan-only regions |
ysr@777 | 488 | // left-over, we will not be able to add any more non-young |
ysr@777 | 489 | // regions. |
ysr@777 | 490 | min_so_length = 0; |
ysr@777 | 491 | max_so_length = 0; |
ysr@777 | 492 | } else { |
ysr@777 | 493 | // this is the common case; we'll never reach the maximum, we |
ysr@777 | 494 | // one of the end conditions will fire well before that |
ysr@777 | 495 | // (hopefully!) |
ysr@777 | 496 | min_so_length = 0; |
ysr@777 | 497 | max_so_length = _free_regions_at_end_of_collection - 1; |
ysr@777 | 498 | } |
ysr@777 | 499 | } else { |
ysr@777 | 500 | // no S-O prefix, as the switch is not set, but we still need to |
ysr@777 | 501 | // do one iteration to calculate the best young target that |
ysr@777 | 502 | // meets the pause time; this way we reuse the same code instead |
ysr@777 | 503 | // of replicating it |
ysr@777 | 504 | min_so_length = 0; |
ysr@777 | 505 | max_so_length = 0; |
ysr@777 | 506 | } |
ysr@777 | 507 | |
ysr@777 | 508 | double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
ysr@777 | 509 | size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); |
ysr@777 | 510 | size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); |
ysr@777 | 511 | size_t scanned_cards; |
ysr@777 | 512 | if (full_young_gcs()) |
ysr@777 | 513 | scanned_cards = predict_young_card_num(adj_rs_lengths); |
ysr@777 | 514 | else |
ysr@777 | 515 | scanned_cards = predict_non_young_card_num(adj_rs_lengths); |
ysr@777 | 516 | // calculate this once, so that we don't have to recalculate it in |
ysr@777 | 517 | // the innermost loop |
apetrusenko@980 | 518 | double base_time_ms = predict_base_elapsed_time_ms(pending_cards, scanned_cards) |
apetrusenko@980 | 519 | + survivor_regions_evac_time; |
ysr@777 | 520 | // the result |
ysr@777 | 521 | size_t final_young_length = 0; |
ysr@777 | 522 | size_t final_so_length = 0; |
ysr@777 | 523 | double final_gc_eff = 0.0; |
ysr@777 | 524 | // we'll also keep track of how many times we go into the inner loop |
ysr@777 | 525 | // this is for profiling reasons |
ysr@777 | 526 | size_t calculations = 0; |
ysr@777 | 527 | |
ysr@777 | 528 | // this determines which of the three iterations the outer loop is in |
ysr@777 | 529 | typedef enum { |
ysr@777 | 530 | pass_type_coarse, |
ysr@777 | 531 | pass_type_fine, |
ysr@777 | 532 | pass_type_final |
ysr@777 | 533 | } pass_type_t; |
ysr@777 | 534 | |
ysr@777 | 535 | // range of the outer loop's iteration |
ysr@777 | 536 | size_t from_so_length = min_so_length; |
ysr@777 | 537 | size_t to_so_length = max_so_length; |
ysr@777 | 538 | guarantee( from_so_length <= to_so_length, "invariant" ); |
ysr@777 | 539 | |
ysr@777 | 540 | // this will keep the S-O length that's found by the second |
ysr@777 | 541 | // iteration of the outer loop; we'll keep it just in case the third |
ysr@777 | 542 | // iteration fails to find something |
ysr@777 | 543 | size_t fine_so_length = 0; |
ysr@777 | 544 | |
ysr@777 | 545 | // the increment step for the coarse (first) iteration |
ysr@777 | 546 | size_t so_coarse_increments = 5; |
ysr@777 | 547 | |
ysr@777 | 548 | // the common case, we'll start with the coarse iteration |
ysr@777 | 549 | pass_type_t pass = pass_type_coarse; |
ysr@777 | 550 | size_t so_length_incr = so_coarse_increments; |
ysr@777 | 551 | |
ysr@777 | 552 | if (from_so_length == to_so_length) { |
ysr@777 | 553 | // not point in doing the coarse iteration, we'll go directly into |
ysr@777 | 554 | // the fine one (we essentially trying to find the optimal young |
ysr@777 | 555 | // length for a fixed S-O length). |
ysr@777 | 556 | so_length_incr = 1; |
ysr@777 | 557 | pass = pass_type_final; |
ysr@777 | 558 | } else if (to_so_length - from_so_length < 3 * so_coarse_increments) { |
ysr@777 | 559 | // again, the range is too short so no point in foind the coarse |
ysr@777 | 560 | // iteration either |
ysr@777 | 561 | so_length_incr = 1; |
ysr@777 | 562 | pass = pass_type_fine; |
ysr@777 | 563 | } |
ysr@777 | 564 | |
ysr@777 | 565 | bool done = false; |
ysr@777 | 566 | // this is the outermost loop |
ysr@777 | 567 | while (!done) { |
apetrusenko@980 | 568 | #ifdef TRACE_CALC_YOUNG_CONFIG |
ysr@777 | 569 | // leave this in for debugging, just in case |
ysr@777 | 570 | gclog_or_tty->print_cr("searching between " SIZE_FORMAT " and " SIZE_FORMAT |
ysr@777 | 571 | ", incr " SIZE_FORMAT ", pass %s", |
ysr@777 | 572 | from_so_length, to_so_length, so_length_incr, |
ysr@777 | 573 | (pass == pass_type_coarse) ? "coarse" : |
ysr@777 | 574 | (pass == pass_type_fine) ? "fine" : "final"); |
apetrusenko@980 | 575 | #endif // TRACE_CALC_YOUNG_CONFIG |
ysr@777 | 576 | |
ysr@777 | 577 | size_t so_length = from_so_length; |
ysr@777 | 578 | size_t init_free_regions = |
ysr@777 | 579 | MAX2((size_t)0, |
ysr@777 | 580 | _free_regions_at_end_of_collection + |
ysr@777 | 581 | _scan_only_regions_at_end_of_collection - reserve_regions); |
ysr@777 | 582 | |
ysr@777 | 583 | // this determines whether a configuration was found |
ysr@777 | 584 | bool gc_eff_set = false; |
ysr@777 | 585 | // this is the middle loop |
ysr@777 | 586 | while (so_length <= to_so_length) { |
ysr@777 | 587 | // base time, which excludes region-related time; again we |
ysr@777 | 588 | // calculate it once to avoid recalculating it in the |
ysr@777 | 589 | // innermost loop |
ysr@777 | 590 | double base_time_with_so_ms = |
ysr@777 | 591 | base_time_ms + predict_scan_only_time_ms(so_length); |
ysr@777 | 592 | // it's already over the pause target, go around |
ysr@777 | 593 | if (base_time_with_so_ms > target_pause_time_ms) |
ysr@777 | 594 | break; |
ysr@777 | 595 | |
ysr@777 | 596 | size_t starting_young_length = so_length+1; |
ysr@777 | 597 | |
ysr@777 | 598 | // we make sure that the short young length that makes sense |
ysr@777 | 599 | // (one more than the S-O length) is feasible |
ysr@777 | 600 | size_t min_young_length = starting_young_length; |
ysr@777 | 601 | double min_gc_eff; |
ysr@777 | 602 | bool min_ok; |
ysr@777 | 603 | ++calculations; |
ysr@777 | 604 | min_ok = predict_gc_eff(min_young_length, so_length, |
ysr@777 | 605 | base_time_with_so_ms, |
ysr@777 | 606 | init_free_regions, target_pause_time_ms, |
ysr@777 | 607 | &min_gc_eff); |
ysr@777 | 608 | |
ysr@777 | 609 | if (min_ok) { |
ysr@777 | 610 | // the shortest young length is indeed feasible; we'll know |
ysr@777 | 611 | // set up the max young length and we'll do a binary search |
ysr@777 | 612 | // between min_young_length and max_young_length |
ysr@777 | 613 | size_t max_young_length = _free_regions_at_end_of_collection - 1; |
ysr@777 | 614 | double max_gc_eff = 0.0; |
ysr@777 | 615 | bool max_ok = false; |
ysr@777 | 616 | |
ysr@777 | 617 | // the innermost loop! (finally!) |
ysr@777 | 618 | while (max_young_length > min_young_length) { |
ysr@777 | 619 | // we'll make sure that min_young_length is always at a |
ysr@777 | 620 | // feasible config |
ysr@777 | 621 | guarantee( min_ok, "invariant" ); |
ysr@777 | 622 | |
ysr@777 | 623 | ++calculations; |
ysr@777 | 624 | max_ok = predict_gc_eff(max_young_length, so_length, |
ysr@777 | 625 | base_time_with_so_ms, |
ysr@777 | 626 | init_free_regions, target_pause_time_ms, |
ysr@777 | 627 | &max_gc_eff); |
ysr@777 | 628 | |
ysr@777 | 629 | size_t diff = (max_young_length - min_young_length) / 2; |
ysr@777 | 630 | if (max_ok) { |
ysr@777 | 631 | min_young_length = max_young_length; |
ysr@777 | 632 | min_gc_eff = max_gc_eff; |
ysr@777 | 633 | min_ok = true; |
ysr@777 | 634 | } |
ysr@777 | 635 | max_young_length = min_young_length + diff; |
ysr@777 | 636 | } |
ysr@777 | 637 | |
ysr@777 | 638 | // the innermost loop found a config |
ysr@777 | 639 | guarantee( min_ok, "invariant" ); |
ysr@777 | 640 | if (min_gc_eff > final_gc_eff) { |
ysr@777 | 641 | // it's the best config so far, so we'll keep it |
ysr@777 | 642 | final_gc_eff = min_gc_eff; |
ysr@777 | 643 | final_young_length = min_young_length; |
ysr@777 | 644 | final_so_length = so_length; |
ysr@777 | 645 | gc_eff_set = true; |
ysr@777 | 646 | } |
ysr@777 | 647 | } |
ysr@777 | 648 | |
ysr@777 | 649 | // incremental the fixed S-O length and go around |
ysr@777 | 650 | so_length += so_length_incr; |
ysr@777 | 651 | } |
ysr@777 | 652 | |
ysr@777 | 653 | // this is the end of the outermost loop and we need to decide |
ysr@777 | 654 | // what to do during the next iteration |
ysr@777 | 655 | if (pass == pass_type_coarse) { |
ysr@777 | 656 | // we just did the coarse pass (first iteration) |
ysr@777 | 657 | |
ysr@777 | 658 | if (!gc_eff_set) |
ysr@777 | 659 | // we didn't find a feasible config so we'll just bail out; of |
ysr@777 | 660 | // course, it might be the case that we missed it; but I'd say |
ysr@777 | 661 | // it's a bit unlikely |
ysr@777 | 662 | done = true; |
ysr@777 | 663 | else { |
ysr@777 | 664 | // We did find a feasible config with optimal GC eff during |
ysr@777 | 665 | // the first pass. So the second pass we'll only consider the |
ysr@777 | 666 | // S-O lengths around that config with a fine increment. |
ysr@777 | 667 | |
ysr@777 | 668 | guarantee( so_length_incr == so_coarse_increments, "invariant" ); |
ysr@777 | 669 | guarantee( final_so_length >= min_so_length, "invariant" ); |
ysr@777 | 670 | |
apetrusenko@980 | 671 | #ifdef TRACE_CALC_YOUNG_CONFIG |
ysr@777 | 672 | // leave this in for debugging, just in case |
ysr@777 | 673 | gclog_or_tty->print_cr(" coarse pass: SO length " SIZE_FORMAT, |
ysr@777 | 674 | final_so_length); |
apetrusenko@980 | 675 | #endif // TRACE_CALC_YOUNG_CONFIG |
ysr@777 | 676 | |
ysr@777 | 677 | from_so_length = |
ysr@777 | 678 | (final_so_length - min_so_length > so_coarse_increments) ? |
ysr@777 | 679 | final_so_length - so_coarse_increments + 1 : min_so_length; |
ysr@777 | 680 | to_so_length = |
ysr@777 | 681 | (max_so_length - final_so_length > so_coarse_increments) ? |
ysr@777 | 682 | final_so_length + so_coarse_increments - 1 : max_so_length; |
ysr@777 | 683 | |
ysr@777 | 684 | pass = pass_type_fine; |
ysr@777 | 685 | so_length_incr = 1; |
ysr@777 | 686 | } |
ysr@777 | 687 | } else if (pass == pass_type_fine) { |
ysr@777 | 688 | // we just finished the second pass |
ysr@777 | 689 | |
ysr@777 | 690 | if (!gc_eff_set) { |
ysr@777 | 691 | // we didn't find a feasible config (yes, it's possible; |
ysr@777 | 692 | // notice that, sometimes, we go directly into the fine |
ysr@777 | 693 | // iteration and skip the coarse one) so we bail out |
ysr@777 | 694 | done = true; |
ysr@777 | 695 | } else { |
ysr@777 | 696 | // We did find a feasible config with optimal GC eff |
ysr@777 | 697 | guarantee( so_length_incr == 1, "invariant" ); |
ysr@777 | 698 | |
ysr@777 | 699 | if (final_so_length == 0) { |
ysr@777 | 700 | // The config is of an empty S-O set, so we'll just bail out |
ysr@777 | 701 | done = true; |
ysr@777 | 702 | } else { |
ysr@777 | 703 | // we'll go around once more, setting the S-O length to 95% |
ysr@777 | 704 | // of the optimal |
ysr@777 | 705 | size_t new_so_length = 950 * final_so_length / 1000; |
ysr@777 | 706 | |
apetrusenko@980 | 707 | #ifdef TRACE_CALC_YOUNG_CONFIG |
ysr@777 | 708 | // leave this in for debugging, just in case |
ysr@777 | 709 | gclog_or_tty->print_cr(" fine pass: SO length " SIZE_FORMAT |
ysr@777 | 710 | ", setting it to " SIZE_FORMAT, |
ysr@777 | 711 | final_so_length, new_so_length); |
apetrusenko@980 | 712 | #endif // TRACE_CALC_YOUNG_CONFIG |
ysr@777 | 713 | |
ysr@777 | 714 | from_so_length = new_so_length; |
ysr@777 | 715 | to_so_length = new_so_length; |
ysr@777 | 716 | fine_so_length = final_so_length; |
ysr@777 | 717 | |
ysr@777 | 718 | pass = pass_type_final; |
ysr@777 | 719 | } |
ysr@777 | 720 | } |
ysr@777 | 721 | } else if (pass == pass_type_final) { |
ysr@777 | 722 | // we just finished the final (third) pass |
ysr@777 | 723 | |
ysr@777 | 724 | if (!gc_eff_set) |
ysr@777 | 725 | // we didn't find a feasible config, so we'll just use the one |
ysr@777 | 726 | // we found during the second pass, which we saved |
ysr@777 | 727 | final_so_length = fine_so_length; |
ysr@777 | 728 | |
ysr@777 | 729 | // and we're done! |
ysr@777 | 730 | done = true; |
ysr@777 | 731 | } else { |
ysr@777 | 732 | guarantee( false, "should never reach here" ); |
ysr@777 | 733 | } |
ysr@777 | 734 | |
ysr@777 | 735 | // we now go around the outermost loop |
ysr@777 | 736 | } |
ysr@777 | 737 | |
ysr@777 | 738 | // we should have at least one region in the target young length |
apetrusenko@980 | 739 | _young_list_target_length = |
apetrusenko@980 | 740 | MAX2((size_t) 1, final_young_length + _recorded_survivor_regions); |
ysr@777 | 741 | if (final_so_length >= final_young_length) |
ysr@777 | 742 | // and we need to ensure that the S-O length is not greater than |
ysr@777 | 743 | // the target young length (this is being a bit careful) |
ysr@777 | 744 | final_so_length = 0; |
ysr@777 | 745 | _young_list_so_prefix_length = final_so_length; |
ysr@777 | 746 | guarantee( !_in_marking_window || !_last_full_young_gc || |
ysr@777 | 747 | _young_list_so_prefix_length == 0, "invariant" ); |
ysr@777 | 748 | |
ysr@777 | 749 | // let's keep an eye of how long we spend on this calculation |
ysr@777 | 750 | // right now, I assume that we'll print it when we need it; we |
ysr@777 | 751 | // should really adde it to the breakdown of a pause |
ysr@777 | 752 | double end_time_sec = os::elapsedTime(); |
ysr@777 | 753 | double elapsed_time_ms = (end_time_sec - start_time_sec) * 1000.0; |
ysr@777 | 754 | |
apetrusenko@980 | 755 | #ifdef TRACE_CALC_YOUNG_CONFIG |
ysr@777 | 756 | // leave this in for debugging, just in case |
ysr@777 | 757 | gclog_or_tty->print_cr("target = %1.1lf ms, young = " SIZE_FORMAT |
ysr@777 | 758 | ", SO = " SIZE_FORMAT ", " |
ysr@777 | 759 | "elapsed %1.2lf ms, calcs: " SIZE_FORMAT " (%s%s) " |
ysr@777 | 760 | SIZE_FORMAT SIZE_FORMAT, |
ysr@777 | 761 | target_pause_time_ms, |
ysr@777 | 762 | _young_list_target_length - _young_list_so_prefix_length, |
ysr@777 | 763 | _young_list_so_prefix_length, |
ysr@777 | 764 | elapsed_time_ms, |
ysr@777 | 765 | calculations, |
ysr@777 | 766 | full_young_gcs() ? "full" : "partial", |
ysr@777 | 767 | should_initiate_conc_mark() ? " i-m" : "", |
apetrusenko@980 | 768 | _in_marking_window, |
apetrusenko@980 | 769 | _in_marking_window_im); |
apetrusenko@980 | 770 | #endif // TRACE_CALC_YOUNG_CONFIG |
ysr@777 | 771 | |
ysr@777 | 772 | if (_young_list_target_length < _young_list_min_length) { |
ysr@777 | 773 | // bummer; this means that, if we do a pause when the optimal |
ysr@777 | 774 | // config dictates, we'll violate the pause spacing target (the |
ysr@777 | 775 | // min length was calculate based on the application's current |
ysr@777 | 776 | // alloc rate); |
ysr@777 | 777 | |
ysr@777 | 778 | // so, we have to bite the bullet, and allocate the minimum |
ysr@777 | 779 | // number. We'll violate our target, but we just can't meet it. |
ysr@777 | 780 | |
ysr@777 | 781 | size_t so_length = 0; |
ysr@777 | 782 | // a note further up explains why we do not want an S-O length |
ysr@777 | 783 | // during marking |
ysr@777 | 784 | if (!_in_marking_window && !_last_full_young_gc) |
ysr@777 | 785 | // but we can still try to see whether we can find an optimal |
ysr@777 | 786 | // S-O length |
ysr@777 | 787 | so_length = calculate_optimal_so_length(_young_list_min_length); |
ysr@777 | 788 | |
apetrusenko@980 | 789 | #ifdef TRACE_CALC_YOUNG_CONFIG |
ysr@777 | 790 | // leave this in for debugging, just in case |
ysr@777 | 791 | gclog_or_tty->print_cr("adjusted target length from " |
ysr@777 | 792 | SIZE_FORMAT " to " SIZE_FORMAT |
ysr@777 | 793 | ", SO " SIZE_FORMAT, |
ysr@777 | 794 | _young_list_target_length, _young_list_min_length, |
ysr@777 | 795 | so_length); |
apetrusenko@980 | 796 | #endif // TRACE_CALC_YOUNG_CONFIG |
ysr@777 | 797 | |
ysr@777 | 798 | _young_list_target_length = |
ysr@777 | 799 | MAX2(_young_list_min_length, (size_t)1); |
ysr@777 | 800 | _young_list_so_prefix_length = so_length; |
ysr@777 | 801 | } |
ysr@777 | 802 | } else { |
ysr@777 | 803 | // we are in a partially-young mode or we've run out of regions (due |
ysr@777 | 804 | // to evacuation failure) |
ysr@777 | 805 | |
apetrusenko@980 | 806 | #ifdef TRACE_CALC_YOUNG_CONFIG |
ysr@777 | 807 | // leave this in for debugging, just in case |
ysr@777 | 808 | gclog_or_tty->print_cr("(partial) setting target to " SIZE_FORMAT |
ysr@777 | 809 | ", SO " SIZE_FORMAT, |
ysr@777 | 810 | _young_list_min_length, 0); |
apetrusenko@980 | 811 | #endif // TRACE_CALC_YOUNG_CONFIG |
ysr@777 | 812 | |
ysr@777 | 813 | // we'll do the pause as soon as possible and with no S-O prefix |
ysr@777 | 814 | // (see above for the reasons behind the latter) |
ysr@777 | 815 | _young_list_target_length = |
ysr@777 | 816 | MAX2(_young_list_min_length, (size_t) 1); |
ysr@777 | 817 | _young_list_so_prefix_length = 0; |
ysr@777 | 818 | } |
ysr@777 | 819 | |
ysr@777 | 820 | _rs_lengths_prediction = rs_lengths; |
ysr@777 | 821 | } |
ysr@777 | 822 | |
ysr@777 | 823 | // This is used by: calculate_optimal_so_length(length). It returns |
ysr@777 | 824 | // the GC eff and predicted pause time for a particular config |
ysr@777 | 825 | void |
ysr@777 | 826 | G1CollectorPolicy::predict_gc_eff(size_t young_length, |
ysr@777 | 827 | size_t so_length, |
ysr@777 | 828 | double base_time_ms, |
ysr@777 | 829 | double* ret_gc_eff, |
ysr@777 | 830 | double* ret_pause_time_ms) { |
ysr@777 | 831 | double so_time_ms = predict_scan_only_time_ms(so_length); |
ysr@777 | 832 | double accum_surv_rate_adj = 0.0; |
ysr@777 | 833 | if (so_length > 0) |
ysr@777 | 834 | accum_surv_rate_adj = accum_yg_surv_rate_pred((int)(so_length - 1)); |
ysr@777 | 835 | double accum_surv_rate = |
ysr@777 | 836 | accum_yg_surv_rate_pred((int)(young_length - 1)) - accum_surv_rate_adj; |
ysr@777 | 837 | size_t bytes_to_copy = |
ysr@777 | 838 | (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); |
ysr@777 | 839 | double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
ysr@777 | 840 | double young_other_time_ms = |
ysr@777 | 841 | predict_young_other_time_ms(young_length - so_length); |
ysr@777 | 842 | double pause_time_ms = |
ysr@777 | 843 | base_time_ms + so_time_ms + copy_time_ms + young_other_time_ms; |
ysr@777 | 844 | size_t reclaimed_bytes = |
ysr@777 | 845 | (young_length - so_length) * HeapRegion::GrainBytes - bytes_to_copy; |
ysr@777 | 846 | double gc_eff = (double) reclaimed_bytes / pause_time_ms; |
ysr@777 | 847 | |
ysr@777 | 848 | *ret_gc_eff = gc_eff; |
ysr@777 | 849 | *ret_pause_time_ms = pause_time_ms; |
ysr@777 | 850 | } |
ysr@777 | 851 | |
ysr@777 | 852 | // This is used by: calculate_young_list_target_config(rs_length). It |
ysr@777 | 853 | // returns the GC eff of a particular config. It returns false if that |
ysr@777 | 854 | // config violates any of the end conditions of the search in the |
ysr@777 | 855 | // calling method, or true upon success. The end conditions were put |
ysr@777 | 856 | // here since it's called twice and it was best not to replicate them |
ysr@777 | 857 | // in the caller. Also, passing the parameteres avoids having to |
ysr@777 | 858 | // recalculate them in the innermost loop. |
ysr@777 | 859 | bool |
ysr@777 | 860 | G1CollectorPolicy::predict_gc_eff(size_t young_length, |
ysr@777 | 861 | size_t so_length, |
ysr@777 | 862 | double base_time_with_so_ms, |
ysr@777 | 863 | size_t init_free_regions, |
ysr@777 | 864 | double target_pause_time_ms, |
ysr@777 | 865 | double* ret_gc_eff) { |
ysr@777 | 866 | *ret_gc_eff = 0.0; |
ysr@777 | 867 | |
ysr@777 | 868 | if (young_length >= init_free_regions) |
ysr@777 | 869 | // end condition 1: not enough space for the young regions |
ysr@777 | 870 | return false; |
ysr@777 | 871 | |
ysr@777 | 872 | double accum_surv_rate_adj = 0.0; |
ysr@777 | 873 | if (so_length > 0) |
ysr@777 | 874 | accum_surv_rate_adj = accum_yg_surv_rate_pred((int)(so_length - 1)); |
ysr@777 | 875 | double accum_surv_rate = |
ysr@777 | 876 | accum_yg_surv_rate_pred((int)(young_length - 1)) - accum_surv_rate_adj; |
ysr@777 | 877 | size_t bytes_to_copy = |
ysr@777 | 878 | (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); |
ysr@777 | 879 | double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
ysr@777 | 880 | double young_other_time_ms = |
ysr@777 | 881 | predict_young_other_time_ms(young_length - so_length); |
ysr@777 | 882 | double pause_time_ms = |
ysr@777 | 883 | base_time_with_so_ms + copy_time_ms + young_other_time_ms; |
ysr@777 | 884 | |
ysr@777 | 885 | if (pause_time_ms > target_pause_time_ms) |
ysr@777 | 886 | // end condition 2: over the target pause time |
ysr@777 | 887 | return false; |
ysr@777 | 888 | |
ysr@777 | 889 | size_t reclaimed_bytes = |
ysr@777 | 890 | (young_length - so_length) * HeapRegion::GrainBytes - bytes_to_copy; |
ysr@777 | 891 | size_t free_bytes = |
ysr@777 | 892 | (init_free_regions - young_length) * HeapRegion::GrainBytes; |
ysr@777 | 893 | |
ysr@777 | 894 | if ((2.0 + sigma()) * (double) bytes_to_copy > (double) free_bytes) |
ysr@777 | 895 | // end condition 3: out of to-space (conservatively) |
ysr@777 | 896 | return false; |
ysr@777 | 897 | |
ysr@777 | 898 | // success! |
ysr@777 | 899 | double gc_eff = (double) reclaimed_bytes / pause_time_ms; |
ysr@777 | 900 | *ret_gc_eff = gc_eff; |
ysr@777 | 901 | |
ysr@777 | 902 | return true; |
ysr@777 | 903 | } |
ysr@777 | 904 | |
apetrusenko@980 | 905 | double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
apetrusenko@980 | 906 | double survivor_regions_evac_time = 0.0; |
apetrusenko@980 | 907 | for (HeapRegion * r = _recorded_survivor_head; |
apetrusenko@980 | 908 | r != NULL && r != _recorded_survivor_tail->get_next_young_region(); |
apetrusenko@980 | 909 | r = r->get_next_young_region()) { |
apetrusenko@980 | 910 | survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); |
apetrusenko@980 | 911 | } |
apetrusenko@980 | 912 | return survivor_regions_evac_time; |
apetrusenko@980 | 913 | } |
apetrusenko@980 | 914 | |
ysr@777 | 915 | void G1CollectorPolicy::check_prediction_validity() { |
ysr@777 | 916 | guarantee( adaptive_young_list_length(), "should not call this otherwise" ); |
ysr@777 | 917 | |
ysr@777 | 918 | size_t rs_lengths = _g1->young_list_sampled_rs_lengths(); |
ysr@777 | 919 | if (rs_lengths > _rs_lengths_prediction) { |
ysr@777 | 920 | // add 10% to avoid having to recalculate often |
ysr@777 | 921 | size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; |
ysr@777 | 922 | calculate_young_list_target_config(rs_lengths_prediction); |
ysr@777 | 923 | } |
ysr@777 | 924 | } |
ysr@777 | 925 | |
ysr@777 | 926 | HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, |
ysr@777 | 927 | bool is_tlab, |
ysr@777 | 928 | bool* gc_overhead_limit_was_exceeded) { |
ysr@777 | 929 | guarantee(false, "Not using this policy feature yet."); |
ysr@777 | 930 | return NULL; |
ysr@777 | 931 | } |
ysr@777 | 932 | |
ysr@777 | 933 | // This method controls how a collector handles one or more |
ysr@777 | 934 | // of its generations being fully allocated. |
ysr@777 | 935 | HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, |
ysr@777 | 936 | bool is_tlab) { |
ysr@777 | 937 | guarantee(false, "Not using this policy feature yet."); |
ysr@777 | 938 | return NULL; |
ysr@777 | 939 | } |
ysr@777 | 940 | |
ysr@777 | 941 | |
ysr@777 | 942 | #ifndef PRODUCT |
ysr@777 | 943 | bool G1CollectorPolicy::verify_young_ages() { |
ysr@777 | 944 | HeapRegion* head = _g1->young_list_first_region(); |
ysr@777 | 945 | return |
ysr@777 | 946 | verify_young_ages(head, _short_lived_surv_rate_group); |
ysr@777 | 947 | // also call verify_young_ages on any additional surv rate groups |
ysr@777 | 948 | } |
ysr@777 | 949 | |
ysr@777 | 950 | bool |
ysr@777 | 951 | G1CollectorPolicy::verify_young_ages(HeapRegion* head, |
ysr@777 | 952 | SurvRateGroup *surv_rate_group) { |
ysr@777 | 953 | guarantee( surv_rate_group != NULL, "pre-condition" ); |
ysr@777 | 954 | |
ysr@777 | 955 | const char* name = surv_rate_group->name(); |
ysr@777 | 956 | bool ret = true; |
ysr@777 | 957 | int prev_age = -1; |
ysr@777 | 958 | |
ysr@777 | 959 | for (HeapRegion* curr = head; |
ysr@777 | 960 | curr != NULL; |
ysr@777 | 961 | curr = curr->get_next_young_region()) { |
ysr@777 | 962 | SurvRateGroup* group = curr->surv_rate_group(); |
ysr@777 | 963 | if (group == NULL && !curr->is_survivor()) { |
ysr@777 | 964 | gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); |
ysr@777 | 965 | ret = false; |
ysr@777 | 966 | } |
ysr@777 | 967 | |
ysr@777 | 968 | if (surv_rate_group == group) { |
ysr@777 | 969 | int age = curr->age_in_surv_rate_group(); |
ysr@777 | 970 | |
ysr@777 | 971 | if (age < 0) { |
ysr@777 | 972 | gclog_or_tty->print_cr("## %s: encountered negative age", name); |
ysr@777 | 973 | ret = false; |
ysr@777 | 974 | } |
ysr@777 | 975 | |
ysr@777 | 976 | if (age <= prev_age) { |
ysr@777 | 977 | gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " |
ysr@777 | 978 | "(%d, %d)", name, age, prev_age); |
ysr@777 | 979 | ret = false; |
ysr@777 | 980 | } |
ysr@777 | 981 | prev_age = age; |
ysr@777 | 982 | } |
ysr@777 | 983 | } |
ysr@777 | 984 | |
ysr@777 | 985 | return ret; |
ysr@777 | 986 | } |
ysr@777 | 987 | #endif // PRODUCT |
ysr@777 | 988 | |
ysr@777 | 989 | void G1CollectorPolicy::record_full_collection_start() { |
ysr@777 | 990 | _cur_collection_start_sec = os::elapsedTime(); |
ysr@777 | 991 | // Release the future to-space so that it is available for compaction into. |
ysr@777 | 992 | _g1->set_full_collection(); |
ysr@777 | 993 | } |
ysr@777 | 994 | |
ysr@777 | 995 | void G1CollectorPolicy::record_full_collection_end() { |
ysr@777 | 996 | // Consider this like a collection pause for the purposes of allocation |
ysr@777 | 997 | // since last pause. |
ysr@777 | 998 | double end_sec = os::elapsedTime(); |
ysr@777 | 999 | double full_gc_time_sec = end_sec - _cur_collection_start_sec; |
ysr@777 | 1000 | double full_gc_time_ms = full_gc_time_sec * 1000.0; |
ysr@777 | 1001 | |
ysr@777 | 1002 | _all_full_gc_times_ms->add(full_gc_time_ms); |
ysr@777 | 1003 | |
tonyp@1030 | 1004 | update_recent_gc_times(end_sec, full_gc_time_ms); |
ysr@777 | 1005 | |
ysr@777 | 1006 | _g1->clear_full_collection(); |
ysr@777 | 1007 | |
ysr@777 | 1008 | // "Nuke" the heuristics that control the fully/partially young GC |
ysr@777 | 1009 | // transitions and make sure we start with fully young GCs after the |
ysr@777 | 1010 | // Full GC. |
ysr@777 | 1011 | set_full_young_gcs(true); |
ysr@777 | 1012 | _last_full_young_gc = false; |
ysr@777 | 1013 | _should_revert_to_full_young_gcs = false; |
ysr@777 | 1014 | _should_initiate_conc_mark = false; |
ysr@777 | 1015 | _known_garbage_bytes = 0; |
ysr@777 | 1016 | _known_garbage_ratio = 0.0; |
ysr@777 | 1017 | _in_marking_window = false; |
ysr@777 | 1018 | _in_marking_window_im = false; |
ysr@777 | 1019 | |
ysr@777 | 1020 | _short_lived_surv_rate_group->record_scan_only_prefix(0); |
ysr@777 | 1021 | _short_lived_surv_rate_group->start_adding_regions(); |
ysr@777 | 1022 | // also call this on any additional surv rate groups |
ysr@777 | 1023 | |
apetrusenko@980 | 1024 | record_survivor_regions(0, NULL, NULL); |
apetrusenko@980 | 1025 | |
ysr@777 | 1026 | _prev_region_num_young = _region_num_young; |
ysr@777 | 1027 | _prev_region_num_tenured = _region_num_tenured; |
ysr@777 | 1028 | |
ysr@777 | 1029 | _free_regions_at_end_of_collection = _g1->free_regions(); |
ysr@777 | 1030 | _scan_only_regions_at_end_of_collection = 0; |
apetrusenko@980 | 1031 | // Reset survivors SurvRateGroup. |
apetrusenko@980 | 1032 | _survivor_surv_rate_group->reset(); |
ysr@777 | 1033 | calculate_young_list_min_length(); |
ysr@777 | 1034 | calculate_young_list_target_config(); |
ysr@777 | 1035 | } |
ysr@777 | 1036 | |
ysr@777 | 1037 | void G1CollectorPolicy::record_before_bytes(size_t bytes) { |
ysr@777 | 1038 | _bytes_in_to_space_before_gc += bytes; |
ysr@777 | 1039 | } |
ysr@777 | 1040 | |
ysr@777 | 1041 | void G1CollectorPolicy::record_after_bytes(size_t bytes) { |
ysr@777 | 1042 | _bytes_in_to_space_after_gc += bytes; |
ysr@777 | 1043 | } |
ysr@777 | 1044 | |
ysr@777 | 1045 | void G1CollectorPolicy::record_stop_world_start() { |
ysr@777 | 1046 | _stop_world_start = os::elapsedTime(); |
ysr@777 | 1047 | } |
ysr@777 | 1048 | |
ysr@777 | 1049 | void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, |
ysr@777 | 1050 | size_t start_used) { |
ysr@777 | 1051 | if (PrintGCDetails) { |
ysr@777 | 1052 | gclog_or_tty->stamp(PrintGCTimeStamps); |
ysr@777 | 1053 | gclog_or_tty->print("[GC pause"); |
ysr@777 | 1054 | if (in_young_gc_mode()) |
ysr@777 | 1055 | gclog_or_tty->print(" (%s)", full_young_gcs() ? "young" : "partial"); |
ysr@777 | 1056 | } |
ysr@777 | 1057 | |
ysr@777 | 1058 | assert(_g1->used_regions() == _g1->recalculate_used_regions(), |
ysr@777 | 1059 | "sanity"); |
tonyp@1071 | 1060 | assert(_g1->used() == _g1->recalculate_used(), "sanity"); |
ysr@777 | 1061 | |
ysr@777 | 1062 | double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; |
ysr@777 | 1063 | _all_stop_world_times_ms->add(s_w_t_ms); |
ysr@777 | 1064 | _stop_world_start = 0.0; |
ysr@777 | 1065 | |
ysr@777 | 1066 | _cur_collection_start_sec = start_time_sec; |
ysr@777 | 1067 | _cur_collection_pause_used_at_start_bytes = start_used; |
ysr@777 | 1068 | _cur_collection_pause_used_regions_at_start = _g1->used_regions(); |
ysr@777 | 1069 | _pending_cards = _g1->pending_card_num(); |
ysr@777 | 1070 | _max_pending_cards = _g1->max_pending_card_num(); |
ysr@777 | 1071 | |
ysr@777 | 1072 | _bytes_in_to_space_before_gc = 0; |
ysr@777 | 1073 | _bytes_in_to_space_after_gc = 0; |
ysr@777 | 1074 | _bytes_in_collection_set_before_gc = 0; |
ysr@777 | 1075 | |
ysr@777 | 1076 | #ifdef DEBUG |
ysr@777 | 1077 | // initialise these to something well known so that we can spot |
ysr@777 | 1078 | // if they are not set properly |
ysr@777 | 1079 | |
ysr@777 | 1080 | for (int i = 0; i < _parallel_gc_threads; ++i) { |
ysr@777 | 1081 | _par_last_ext_root_scan_times_ms[i] = -666.0; |
ysr@777 | 1082 | _par_last_mark_stack_scan_times_ms[i] = -666.0; |
ysr@777 | 1083 | _par_last_scan_only_times_ms[i] = -666.0; |
ysr@777 | 1084 | _par_last_scan_only_regions_scanned[i] = -666.0; |
ysr@777 | 1085 | _par_last_update_rs_start_times_ms[i] = -666.0; |
ysr@777 | 1086 | _par_last_update_rs_times_ms[i] = -666.0; |
ysr@777 | 1087 | _par_last_update_rs_processed_buffers[i] = -666.0; |
ysr@777 | 1088 | _par_last_scan_rs_start_times_ms[i] = -666.0; |
ysr@777 | 1089 | _par_last_scan_rs_times_ms[i] = -666.0; |
ysr@777 | 1090 | _par_last_scan_new_refs_times_ms[i] = -666.0; |
ysr@777 | 1091 | _par_last_obj_copy_times_ms[i] = -666.0; |
ysr@777 | 1092 | _par_last_termination_times_ms[i] = -666.0; |
ysr@777 | 1093 | } |
ysr@777 | 1094 | #endif |
ysr@777 | 1095 | |
ysr@777 | 1096 | for (int i = 0; i < _aux_num; ++i) { |
ysr@777 | 1097 | _cur_aux_times_ms[i] = 0.0; |
ysr@777 | 1098 | _cur_aux_times_set[i] = false; |
ysr@777 | 1099 | } |
ysr@777 | 1100 | |
ysr@777 | 1101 | _satb_drain_time_set = false; |
ysr@777 | 1102 | _last_satb_drain_processed_buffers = -1; |
ysr@777 | 1103 | |
ysr@777 | 1104 | if (in_young_gc_mode()) |
ysr@777 | 1105 | _last_young_gc_full = false; |
ysr@777 | 1106 | |
ysr@777 | 1107 | |
ysr@777 | 1108 | // do that for any other surv rate groups |
ysr@777 | 1109 | _short_lived_surv_rate_group->stop_adding_regions(); |
ysr@777 | 1110 | size_t short_lived_so_length = _young_list_so_prefix_length; |
ysr@777 | 1111 | _short_lived_surv_rate_group->record_scan_only_prefix(short_lived_so_length); |
ysr@777 | 1112 | tag_scan_only(short_lived_so_length); |
ysr@777 | 1113 | |
johnc@1186 | 1114 | if (G1UseSurvivorSpaces) { |
apetrusenko@980 | 1115 | _survivors_age_table.clear(); |
apetrusenko@980 | 1116 | } |
apetrusenko@980 | 1117 | |
ysr@777 | 1118 | assert( verify_young_ages(), "region age verification" ); |
ysr@777 | 1119 | } |
ysr@777 | 1120 | |
ysr@777 | 1121 | void G1CollectorPolicy::tag_scan_only(size_t short_lived_scan_only_length) { |
ysr@777 | 1122 | // done in a way that it can be extended for other surv rate groups too... |
ysr@777 | 1123 | |
ysr@777 | 1124 | HeapRegion* head = _g1->young_list_first_region(); |
ysr@777 | 1125 | bool finished_short_lived = (short_lived_scan_only_length == 0); |
ysr@777 | 1126 | |
ysr@777 | 1127 | if (finished_short_lived) |
ysr@777 | 1128 | return; |
ysr@777 | 1129 | |
ysr@777 | 1130 | for (HeapRegion* curr = head; |
ysr@777 | 1131 | curr != NULL; |
ysr@777 | 1132 | curr = curr->get_next_young_region()) { |
ysr@777 | 1133 | SurvRateGroup* surv_rate_group = curr->surv_rate_group(); |
ysr@777 | 1134 | int age = curr->age_in_surv_rate_group(); |
ysr@777 | 1135 | |
ysr@777 | 1136 | if (surv_rate_group == _short_lived_surv_rate_group) { |
ysr@777 | 1137 | if ((size_t)age < short_lived_scan_only_length) |
ysr@777 | 1138 | curr->set_scan_only(); |
ysr@777 | 1139 | else |
ysr@777 | 1140 | finished_short_lived = true; |
ysr@777 | 1141 | } |
ysr@777 | 1142 | |
ysr@777 | 1143 | |
ysr@777 | 1144 | if (finished_short_lived) |
ysr@777 | 1145 | return; |
ysr@777 | 1146 | } |
ysr@777 | 1147 | |
ysr@777 | 1148 | guarantee( false, "we should never reach here" ); |
ysr@777 | 1149 | } |
ysr@777 | 1150 | |
ysr@777 | 1151 | void G1CollectorPolicy::record_mark_closure_time(double mark_closure_time_ms) { |
ysr@777 | 1152 | _mark_closure_time_ms = mark_closure_time_ms; |
ysr@777 | 1153 | } |
ysr@777 | 1154 | |
ysr@777 | 1155 | void G1CollectorPolicy::record_concurrent_mark_init_start() { |
ysr@777 | 1156 | _mark_init_start_sec = os::elapsedTime(); |
ysr@777 | 1157 | guarantee(!in_young_gc_mode(), "should not do be here in young GC mode"); |
ysr@777 | 1158 | } |
ysr@777 | 1159 | |
ysr@777 | 1160 | void G1CollectorPolicy::record_concurrent_mark_init_end_pre(double |
ysr@777 | 1161 | mark_init_elapsed_time_ms) { |
ysr@777 | 1162 | _during_marking = true; |
ysr@777 | 1163 | _should_initiate_conc_mark = false; |
ysr@777 | 1164 | _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
ysr@777 | 1165 | } |
ysr@777 | 1166 | |
ysr@777 | 1167 | void G1CollectorPolicy::record_concurrent_mark_init_end() { |
ysr@777 | 1168 | double end_time_sec = os::elapsedTime(); |
ysr@777 | 1169 | double elapsed_time_ms = (end_time_sec - _mark_init_start_sec) * 1000.0; |
ysr@777 | 1170 | _concurrent_mark_init_times_ms->add(elapsed_time_ms); |
ysr@777 | 1171 | record_concurrent_mark_init_end_pre(elapsed_time_ms); |
ysr@777 | 1172 | |
ysr@777 | 1173 | _mmu_tracker->add_pause(_mark_init_start_sec, end_time_sec, true); |
ysr@777 | 1174 | } |
ysr@777 | 1175 | |
ysr@777 | 1176 | void G1CollectorPolicy::record_concurrent_mark_remark_start() { |
ysr@777 | 1177 | _mark_remark_start_sec = os::elapsedTime(); |
ysr@777 | 1178 | _during_marking = false; |
ysr@777 | 1179 | } |
ysr@777 | 1180 | |
ysr@777 | 1181 | void G1CollectorPolicy::record_concurrent_mark_remark_end() { |
ysr@777 | 1182 | double end_time_sec = os::elapsedTime(); |
ysr@777 | 1183 | double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; |
ysr@777 | 1184 | _concurrent_mark_remark_times_ms->add(elapsed_time_ms); |
ysr@777 | 1185 | _cur_mark_stop_world_time_ms += elapsed_time_ms; |
ysr@777 | 1186 | _prev_collection_pause_end_ms += elapsed_time_ms; |
ysr@777 | 1187 | |
ysr@777 | 1188 | _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); |
ysr@777 | 1189 | } |
ysr@777 | 1190 | |
ysr@777 | 1191 | void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { |
ysr@777 | 1192 | _mark_cleanup_start_sec = os::elapsedTime(); |
ysr@777 | 1193 | } |
ysr@777 | 1194 | |
ysr@777 | 1195 | void |
ysr@777 | 1196 | G1CollectorPolicy::record_concurrent_mark_cleanup_end(size_t freed_bytes, |
ysr@777 | 1197 | size_t max_live_bytes) { |
ysr@777 | 1198 | record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); |
ysr@777 | 1199 | record_concurrent_mark_cleanup_end_work2(); |
ysr@777 | 1200 | } |
ysr@777 | 1201 | |
ysr@777 | 1202 | void |
ysr@777 | 1203 | G1CollectorPolicy:: |
ysr@777 | 1204 | record_concurrent_mark_cleanup_end_work1(size_t freed_bytes, |
ysr@777 | 1205 | size_t max_live_bytes) { |
ysr@777 | 1206 | if (_n_marks < 2) _n_marks++; |
ysr@777 | 1207 | if (G1PolicyVerbose > 0) |
ysr@777 | 1208 | gclog_or_tty->print_cr("At end of marking, max_live is " SIZE_FORMAT " MB " |
ysr@777 | 1209 | " (of " SIZE_FORMAT " MB heap).", |
ysr@777 | 1210 | max_live_bytes/M, _g1->capacity()/M); |
ysr@777 | 1211 | } |
ysr@777 | 1212 | |
ysr@777 | 1213 | // The important thing about this is that it includes "os::elapsedTime". |
ysr@777 | 1214 | void G1CollectorPolicy::record_concurrent_mark_cleanup_end_work2() { |
ysr@777 | 1215 | double end_time_sec = os::elapsedTime(); |
ysr@777 | 1216 | double elapsed_time_ms = (end_time_sec - _mark_cleanup_start_sec)*1000.0; |
ysr@777 | 1217 | _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); |
ysr@777 | 1218 | _cur_mark_stop_world_time_ms += elapsed_time_ms; |
ysr@777 | 1219 | _prev_collection_pause_end_ms += elapsed_time_ms; |
ysr@777 | 1220 | |
ysr@777 | 1221 | _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_time_sec, true); |
ysr@777 | 1222 | |
ysr@777 | 1223 | _num_markings++; |
ysr@777 | 1224 | |
ysr@777 | 1225 | // We did a marking, so reset the "since_last_mark" variables. |
ysr@777 | 1226 | double considerConcMarkCost = 1.0; |
ysr@777 | 1227 | // If there are available processors, concurrent activity is free... |
ysr@777 | 1228 | if (Threads::number_of_non_daemon_threads() * 2 < |
ysr@777 | 1229 | os::active_processor_count()) { |
ysr@777 | 1230 | considerConcMarkCost = 0.0; |
ysr@777 | 1231 | } |
ysr@777 | 1232 | _n_pauses_at_mark_end = _n_pauses; |
ysr@777 | 1233 | _n_marks_since_last_pause++; |
ysr@777 | 1234 | _conc_mark_initiated = false; |
ysr@777 | 1235 | } |
ysr@777 | 1236 | |
ysr@777 | 1237 | void |
ysr@777 | 1238 | G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { |
ysr@777 | 1239 | if (in_young_gc_mode()) { |
ysr@777 | 1240 | _should_revert_to_full_young_gcs = false; |
ysr@777 | 1241 | _last_full_young_gc = true; |
ysr@777 | 1242 | _in_marking_window = false; |
ysr@777 | 1243 | if (adaptive_young_list_length()) |
ysr@777 | 1244 | calculate_young_list_target_config(); |
ysr@777 | 1245 | } |
ysr@777 | 1246 | } |
ysr@777 | 1247 | |
ysr@777 | 1248 | void G1CollectorPolicy::record_concurrent_pause() { |
ysr@777 | 1249 | if (_stop_world_start > 0.0) { |
ysr@777 | 1250 | double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; |
ysr@777 | 1251 | _all_yield_times_ms->add(yield_ms); |
ysr@777 | 1252 | } |
ysr@777 | 1253 | } |
ysr@777 | 1254 | |
ysr@777 | 1255 | void G1CollectorPolicy::record_concurrent_pause_end() { |
ysr@777 | 1256 | } |
ysr@777 | 1257 | |
ysr@777 | 1258 | void G1CollectorPolicy::record_collection_pause_end_CH_strong_roots() { |
ysr@777 | 1259 | _cur_CH_strong_roots_end_sec = os::elapsedTime(); |
ysr@777 | 1260 | _cur_CH_strong_roots_dur_ms = |
ysr@777 | 1261 | (_cur_CH_strong_roots_end_sec - _cur_collection_start_sec) * 1000.0; |
ysr@777 | 1262 | } |
ysr@777 | 1263 | |
ysr@777 | 1264 | void G1CollectorPolicy::record_collection_pause_end_G1_strong_roots() { |
ysr@777 | 1265 | _cur_G1_strong_roots_end_sec = os::elapsedTime(); |
ysr@777 | 1266 | _cur_G1_strong_roots_dur_ms = |
ysr@777 | 1267 | (_cur_G1_strong_roots_end_sec - _cur_CH_strong_roots_end_sec) * 1000.0; |
ysr@777 | 1268 | } |
ysr@777 | 1269 | |
ysr@777 | 1270 | template<class T> |
ysr@777 | 1271 | T sum_of(T* sum_arr, int start, int n, int N) { |
ysr@777 | 1272 | T sum = (T)0; |
ysr@777 | 1273 | for (int i = 0; i < n; i++) { |
ysr@777 | 1274 | int j = (start + i) % N; |
ysr@777 | 1275 | sum += sum_arr[j]; |
ysr@777 | 1276 | } |
ysr@777 | 1277 | return sum; |
ysr@777 | 1278 | } |
ysr@777 | 1279 | |
ysr@777 | 1280 | void G1CollectorPolicy::print_par_stats (int level, |
ysr@777 | 1281 | const char* str, |
ysr@777 | 1282 | double* data, |
ysr@777 | 1283 | bool summary) { |
ysr@777 | 1284 | double min = data[0], max = data[0]; |
ysr@777 | 1285 | double total = 0.0; |
ysr@777 | 1286 | int j; |
ysr@777 | 1287 | for (j = 0; j < level; ++j) |
ysr@777 | 1288 | gclog_or_tty->print(" "); |
ysr@777 | 1289 | gclog_or_tty->print("[%s (ms):", str); |
ysr@777 | 1290 | for (uint i = 0; i < ParallelGCThreads; ++i) { |
ysr@777 | 1291 | double val = data[i]; |
ysr@777 | 1292 | if (val < min) |
ysr@777 | 1293 | min = val; |
ysr@777 | 1294 | if (val > max) |
ysr@777 | 1295 | max = val; |
ysr@777 | 1296 | total += val; |
ysr@777 | 1297 | gclog_or_tty->print(" %3.1lf", val); |
ysr@777 | 1298 | } |
ysr@777 | 1299 | if (summary) { |
ysr@777 | 1300 | gclog_or_tty->print_cr(""); |
ysr@777 | 1301 | double avg = total / (double) ParallelGCThreads; |
ysr@777 | 1302 | gclog_or_tty->print(" "); |
ysr@777 | 1303 | for (j = 0; j < level; ++j) |
ysr@777 | 1304 | gclog_or_tty->print(" "); |
ysr@777 | 1305 | gclog_or_tty->print("Avg: %5.1lf, Min: %5.1lf, Max: %5.1lf", |
ysr@777 | 1306 | avg, min, max); |
ysr@777 | 1307 | } |
ysr@777 | 1308 | gclog_or_tty->print_cr("]"); |
ysr@777 | 1309 | } |
ysr@777 | 1310 | |
ysr@777 | 1311 | void G1CollectorPolicy::print_par_buffers (int level, |
ysr@777 | 1312 | const char* str, |
ysr@777 | 1313 | double* data, |
ysr@777 | 1314 | bool summary) { |
ysr@777 | 1315 | double min = data[0], max = data[0]; |
ysr@777 | 1316 | double total = 0.0; |
ysr@777 | 1317 | int j; |
ysr@777 | 1318 | for (j = 0; j < level; ++j) |
ysr@777 | 1319 | gclog_or_tty->print(" "); |
ysr@777 | 1320 | gclog_or_tty->print("[%s :", str); |
ysr@777 | 1321 | for (uint i = 0; i < ParallelGCThreads; ++i) { |
ysr@777 | 1322 | double val = data[i]; |
ysr@777 | 1323 | if (val < min) |
ysr@777 | 1324 | min = val; |
ysr@777 | 1325 | if (val > max) |
ysr@777 | 1326 | max = val; |
ysr@777 | 1327 | total += val; |
ysr@777 | 1328 | gclog_or_tty->print(" %d", (int) val); |
ysr@777 | 1329 | } |
ysr@777 | 1330 | if (summary) { |
ysr@777 | 1331 | gclog_or_tty->print_cr(""); |
ysr@777 | 1332 | double avg = total / (double) ParallelGCThreads; |
ysr@777 | 1333 | gclog_or_tty->print(" "); |
ysr@777 | 1334 | for (j = 0; j < level; ++j) |
ysr@777 | 1335 | gclog_or_tty->print(" "); |
ysr@777 | 1336 | gclog_or_tty->print("Sum: %d, Avg: %d, Min: %d, Max: %d", |
ysr@777 | 1337 | (int)total, (int)avg, (int)min, (int)max); |
ysr@777 | 1338 | } |
ysr@777 | 1339 | gclog_or_tty->print_cr("]"); |
ysr@777 | 1340 | } |
ysr@777 | 1341 | |
ysr@777 | 1342 | void G1CollectorPolicy::print_stats (int level, |
ysr@777 | 1343 | const char* str, |
ysr@777 | 1344 | double value) { |
ysr@777 | 1345 | for (int j = 0; j < level; ++j) |
ysr@777 | 1346 | gclog_or_tty->print(" "); |
ysr@777 | 1347 | gclog_or_tty->print_cr("[%s: %5.1lf ms]", str, value); |
ysr@777 | 1348 | } |
ysr@777 | 1349 | |
ysr@777 | 1350 | void G1CollectorPolicy::print_stats (int level, |
ysr@777 | 1351 | const char* str, |
ysr@777 | 1352 | int value) { |
ysr@777 | 1353 | for (int j = 0; j < level; ++j) |
ysr@777 | 1354 | gclog_or_tty->print(" "); |
ysr@777 | 1355 | gclog_or_tty->print_cr("[%s: %d]", str, value); |
ysr@777 | 1356 | } |
ysr@777 | 1357 | |
ysr@777 | 1358 | double G1CollectorPolicy::avg_value (double* data) { |
ysr@777 | 1359 | if (ParallelGCThreads > 0) { |
ysr@777 | 1360 | double ret = 0.0; |
ysr@777 | 1361 | for (uint i = 0; i < ParallelGCThreads; ++i) |
ysr@777 | 1362 | ret += data[i]; |
ysr@777 | 1363 | return ret / (double) ParallelGCThreads; |
ysr@777 | 1364 | } else { |
ysr@777 | 1365 | return data[0]; |
ysr@777 | 1366 | } |
ysr@777 | 1367 | } |
ysr@777 | 1368 | |
ysr@777 | 1369 | double G1CollectorPolicy::max_value (double* data) { |
ysr@777 | 1370 | if (ParallelGCThreads > 0) { |
ysr@777 | 1371 | double ret = data[0]; |
ysr@777 | 1372 | for (uint i = 1; i < ParallelGCThreads; ++i) |
ysr@777 | 1373 | if (data[i] > ret) |
ysr@777 | 1374 | ret = data[i]; |
ysr@777 | 1375 | return ret; |
ysr@777 | 1376 | } else { |
ysr@777 | 1377 | return data[0]; |
ysr@777 | 1378 | } |
ysr@777 | 1379 | } |
ysr@777 | 1380 | |
ysr@777 | 1381 | double G1CollectorPolicy::sum_of_values (double* data) { |
ysr@777 | 1382 | if (ParallelGCThreads > 0) { |
ysr@777 | 1383 | double sum = 0.0; |
ysr@777 | 1384 | for (uint i = 0; i < ParallelGCThreads; i++) |
ysr@777 | 1385 | sum += data[i]; |
ysr@777 | 1386 | return sum; |
ysr@777 | 1387 | } else { |
ysr@777 | 1388 | return data[0]; |
ysr@777 | 1389 | } |
ysr@777 | 1390 | } |
ysr@777 | 1391 | |
ysr@777 | 1392 | double G1CollectorPolicy::max_sum (double* data1, |
ysr@777 | 1393 | double* data2) { |
ysr@777 | 1394 | double ret = data1[0] + data2[0]; |
ysr@777 | 1395 | |
ysr@777 | 1396 | if (ParallelGCThreads > 0) { |
ysr@777 | 1397 | for (uint i = 1; i < ParallelGCThreads; ++i) { |
ysr@777 | 1398 | double data = data1[i] + data2[i]; |
ysr@777 | 1399 | if (data > ret) |
ysr@777 | 1400 | ret = data; |
ysr@777 | 1401 | } |
ysr@777 | 1402 | } |
ysr@777 | 1403 | return ret; |
ysr@777 | 1404 | } |
ysr@777 | 1405 | |
ysr@777 | 1406 | // Anything below that is considered to be zero |
ysr@777 | 1407 | #define MIN_TIMER_GRANULARITY 0.0000001 |
ysr@777 | 1408 | |
apetrusenko@1112 | 1409 | void G1CollectorPolicy::record_collection_pause_end(bool abandoned) { |
ysr@777 | 1410 | double end_time_sec = os::elapsedTime(); |
ysr@777 | 1411 | double elapsed_ms = _last_pause_time_ms; |
ysr@777 | 1412 | bool parallel = ParallelGCThreads > 0; |
ysr@777 | 1413 | double evac_ms = (end_time_sec - _cur_G1_strong_roots_end_sec) * 1000.0; |
ysr@777 | 1414 | size_t rs_size = |
ysr@777 | 1415 | _cur_collection_pause_used_regions_at_start - collection_set_size(); |
ysr@777 | 1416 | size_t cur_used_bytes = _g1->used(); |
ysr@777 | 1417 | assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); |
ysr@777 | 1418 | bool last_pause_included_initial_mark = false; |
tonyp@1030 | 1419 | bool update_stats = !abandoned && !_g1->evacuation_failed(); |
ysr@777 | 1420 | |
ysr@777 | 1421 | #ifndef PRODUCT |
ysr@777 | 1422 | if (G1YoungSurvRateVerbose) { |
ysr@777 | 1423 | gclog_or_tty->print_cr(""); |
ysr@777 | 1424 | _short_lived_surv_rate_group->print(); |
ysr@777 | 1425 | // do that for any other surv rate groups too |
ysr@777 | 1426 | } |
ysr@777 | 1427 | #endif // PRODUCT |
ysr@777 | 1428 | |
ysr@777 | 1429 | if (in_young_gc_mode()) { |
ysr@777 | 1430 | last_pause_included_initial_mark = _should_initiate_conc_mark; |
ysr@777 | 1431 | if (last_pause_included_initial_mark) |
ysr@777 | 1432 | record_concurrent_mark_init_end_pre(0.0); |
ysr@777 | 1433 | |
ysr@777 | 1434 | size_t min_used_targ = |
ysr@777 | 1435 | (_g1->capacity() / 100) * (G1SteadyStateUsed - G1SteadyStateUsedDelta); |
ysr@777 | 1436 | |
ysr@777 | 1437 | if (cur_used_bytes > min_used_targ) { |
ysr@777 | 1438 | if (cur_used_bytes <= _prev_collection_pause_used_at_end_bytes) { |
ysr@777 | 1439 | } else if (!_g1->mark_in_progress() && !_last_full_young_gc) { |
ysr@777 | 1440 | _should_initiate_conc_mark = true; |
ysr@777 | 1441 | } |
ysr@777 | 1442 | } |
ysr@777 | 1443 | |
ysr@777 | 1444 | _prev_collection_pause_used_at_end_bytes = cur_used_bytes; |
ysr@777 | 1445 | } |
ysr@777 | 1446 | |
ysr@777 | 1447 | _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0, |
ysr@777 | 1448 | end_time_sec, false); |
ysr@777 | 1449 | |
ysr@777 | 1450 | guarantee(_cur_collection_pause_used_regions_at_start >= |
ysr@777 | 1451 | collection_set_size(), |
ysr@777 | 1452 | "Negative RS size?"); |
ysr@777 | 1453 | |
ysr@777 | 1454 | // This assert is exempted when we're doing parallel collection pauses, |
ysr@777 | 1455 | // because the fragmentation caused by the parallel GC allocation buffers |
ysr@777 | 1456 | // can lead to more memory being used during collection than was used |
ysr@777 | 1457 | // before. Best leave this out until the fragmentation problem is fixed. |
ysr@777 | 1458 | // Pauses in which evacuation failed can also lead to negative |
ysr@777 | 1459 | // collections, since no space is reclaimed from a region containing an |
ysr@777 | 1460 | // object whose evacuation failed. |
ysr@777 | 1461 | // Further, we're now always doing parallel collection. But I'm still |
ysr@777 | 1462 | // leaving this here as a placeholder for a more precise assertion later. |
ysr@777 | 1463 | // (DLD, 10/05.) |
ysr@777 | 1464 | assert((true || parallel) // Always using GC LABs now. |
ysr@777 | 1465 | || _g1->evacuation_failed() |
ysr@777 | 1466 | || _cur_collection_pause_used_at_start_bytes >= cur_used_bytes, |
ysr@777 | 1467 | "Negative collection"); |
ysr@777 | 1468 | |
ysr@777 | 1469 | size_t freed_bytes = |
ysr@777 | 1470 | _cur_collection_pause_used_at_start_bytes - cur_used_bytes; |
ysr@777 | 1471 | size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; |
ysr@777 | 1472 | double survival_fraction = |
ysr@777 | 1473 | (double)surviving_bytes/ |
ysr@777 | 1474 | (double)_collection_set_bytes_used_before; |
ysr@777 | 1475 | |
ysr@777 | 1476 | _n_pauses++; |
ysr@777 | 1477 | |
tonyp@1030 | 1478 | if (update_stats) { |
ysr@777 | 1479 | _recent_CH_strong_roots_times_ms->add(_cur_CH_strong_roots_dur_ms); |
ysr@777 | 1480 | _recent_G1_strong_roots_times_ms->add(_cur_G1_strong_roots_dur_ms); |
ysr@777 | 1481 | _recent_evac_times_ms->add(evac_ms); |
ysr@777 | 1482 | _recent_pause_times_ms->add(elapsed_ms); |
ysr@777 | 1483 | |
ysr@777 | 1484 | _recent_rs_sizes->add(rs_size); |
ysr@777 | 1485 | |
ysr@777 | 1486 | // We exempt parallel collection from this check because Alloc Buffer |
ysr@777 | 1487 | // fragmentation can produce negative collections. Same with evac |
ysr@777 | 1488 | // failure. |
ysr@777 | 1489 | // Further, we're now always doing parallel collection. But I'm still |
ysr@777 | 1490 | // leaving this here as a placeholder for a more precise assertion later. |
ysr@777 | 1491 | // (DLD, 10/05. |
ysr@777 | 1492 | assert((true || parallel) |
ysr@777 | 1493 | || _g1->evacuation_failed() |
ysr@777 | 1494 | || surviving_bytes <= _collection_set_bytes_used_before, |
ysr@777 | 1495 | "Or else negative collection!"); |
ysr@777 | 1496 | _recent_CS_bytes_used_before->add(_collection_set_bytes_used_before); |
ysr@777 | 1497 | _recent_CS_bytes_surviving->add(surviving_bytes); |
ysr@777 | 1498 | |
ysr@777 | 1499 | // this is where we update the allocation rate of the application |
ysr@777 | 1500 | double app_time_ms = |
ysr@777 | 1501 | (_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms); |
ysr@777 | 1502 | if (app_time_ms < MIN_TIMER_GRANULARITY) { |
ysr@777 | 1503 | // This usually happens due to the timer not having the required |
ysr@777 | 1504 | // granularity. Some Linuxes are the usual culprits. |
ysr@777 | 1505 | // We'll just set it to something (arbitrarily) small. |
ysr@777 | 1506 | app_time_ms = 1.0; |
ysr@777 | 1507 | } |
ysr@777 | 1508 | size_t regions_allocated = |
ysr@777 | 1509 | (_region_num_young - _prev_region_num_young) + |
ysr@777 | 1510 | (_region_num_tenured - _prev_region_num_tenured); |
ysr@777 | 1511 | double alloc_rate_ms = (double) regions_allocated / app_time_ms; |
ysr@777 | 1512 | _alloc_rate_ms_seq->add(alloc_rate_ms); |
ysr@777 | 1513 | _prev_region_num_young = _region_num_young; |
ysr@777 | 1514 | _prev_region_num_tenured = _region_num_tenured; |
ysr@777 | 1515 | |
ysr@777 | 1516 | double interval_ms = |
ysr@777 | 1517 | (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; |
ysr@777 | 1518 | update_recent_gc_times(end_time_sec, elapsed_ms); |
ysr@777 | 1519 | _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; |
ysr@1521 | 1520 | if (recent_avg_pause_time_ratio() < 0.0 || |
ysr@1521 | 1521 | (recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
ysr@1521 | 1522 | #ifndef PRODUCT |
ysr@1521 | 1523 | // Dump info to allow post-facto debugging |
ysr@1521 | 1524 | gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
ysr@1521 | 1525 | gclog_or_tty->print_cr("-------------------------------------------"); |
ysr@1521 | 1526 | gclog_or_tty->print_cr("Recent GC Times (ms):"); |
ysr@1521 | 1527 | _recent_gc_times_ms->dump(); |
ysr@1521 | 1528 | gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
ysr@1521 | 1529 | _recent_prev_end_times_for_all_gcs_sec->dump(); |
ysr@1521 | 1530 | gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
ysr@1521 | 1531 | _recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
ysr@1522 | 1532 | // In debug mode, terminate the JVM if the user wants to debug at this point. |
ysr@1522 | 1533 | assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
ysr@1522 | 1534 | #endif // !PRODUCT |
ysr@1522 | 1535 | // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
ysr@1522 | 1536 | // CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
ysr@1521 | 1537 | if (_recent_avg_pause_time_ratio < 0.0) { |
ysr@1521 | 1538 | _recent_avg_pause_time_ratio = 0.0; |
ysr@1521 | 1539 | } else { |
ysr@1521 | 1540 | assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
ysr@1521 | 1541 | _recent_avg_pause_time_ratio = 1.0; |
ysr@1521 | 1542 | } |
ysr@1521 | 1543 | } |
ysr@777 | 1544 | } |
ysr@777 | 1545 | |
ysr@777 | 1546 | if (G1PolicyVerbose > 1) { |
ysr@777 | 1547 | gclog_or_tty->print_cr(" Recording collection pause(%d)", _n_pauses); |
ysr@777 | 1548 | } |
ysr@777 | 1549 | |
ysr@777 | 1550 | PauseSummary* summary; |
apetrusenko@1112 | 1551 | if (abandoned) { |
apetrusenko@1112 | 1552 | summary = _abandoned_summary; |
apetrusenko@1112 | 1553 | } else { |
apetrusenko@1112 | 1554 | summary = _summary; |
ysr@777 | 1555 | } |
ysr@777 | 1556 | |
ysr@777 | 1557 | double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); |
ysr@777 | 1558 | double mark_stack_scan_time = avg_value(_par_last_mark_stack_scan_times_ms); |
ysr@777 | 1559 | double scan_only_time = avg_value(_par_last_scan_only_times_ms); |
ysr@777 | 1560 | double scan_only_regions_scanned = |
ysr@777 | 1561 | sum_of_values(_par_last_scan_only_regions_scanned); |
ysr@777 | 1562 | double update_rs_time = avg_value(_par_last_update_rs_times_ms); |
ysr@777 | 1563 | double update_rs_processed_buffers = |
ysr@777 | 1564 | sum_of_values(_par_last_update_rs_processed_buffers); |
ysr@777 | 1565 | double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); |
ysr@777 | 1566 | double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); |
ysr@777 | 1567 | double termination_time = avg_value(_par_last_termination_times_ms); |
ysr@777 | 1568 | |
tonyp@1083 | 1569 | double parallel_other_time = _cur_collection_par_time_ms - |
tonyp@1083 | 1570 | (update_rs_time + ext_root_scan_time + mark_stack_scan_time + |
tonyp@1083 | 1571 | scan_only_time + scan_rs_time + obj_copy_time + termination_time); |
tonyp@1030 | 1572 | if (update_stats) { |
ysr@777 | 1573 | MainBodySummary* body_summary = summary->main_body_summary(); |
ysr@777 | 1574 | guarantee(body_summary != NULL, "should not be null!"); |
ysr@777 | 1575 | |
ysr@777 | 1576 | if (_satb_drain_time_set) |
ysr@777 | 1577 | body_summary->record_satb_drain_time_ms(_cur_satb_drain_time_ms); |
ysr@777 | 1578 | else |
ysr@777 | 1579 | body_summary->record_satb_drain_time_ms(0.0); |
ysr@777 | 1580 | body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); |
ysr@777 | 1581 | body_summary->record_mark_stack_scan_time_ms(mark_stack_scan_time); |
ysr@777 | 1582 | body_summary->record_scan_only_time_ms(scan_only_time); |
ysr@777 | 1583 | body_summary->record_update_rs_time_ms(update_rs_time); |
ysr@777 | 1584 | body_summary->record_scan_rs_time_ms(scan_rs_time); |
ysr@777 | 1585 | body_summary->record_obj_copy_time_ms(obj_copy_time); |
ysr@777 | 1586 | if (parallel) { |
ysr@777 | 1587 | body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); |
ysr@777 | 1588 | body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); |
ysr@777 | 1589 | body_summary->record_termination_time_ms(termination_time); |
ysr@777 | 1590 | body_summary->record_parallel_other_time_ms(parallel_other_time); |
ysr@777 | 1591 | } |
ysr@777 | 1592 | body_summary->record_mark_closure_time_ms(_mark_closure_time_ms); |
ysr@777 | 1593 | } |
ysr@777 | 1594 | |
ysr@777 | 1595 | if (G1PolicyVerbose > 1) { |
ysr@777 | 1596 | gclog_or_tty->print_cr(" ET: %10.6f ms (avg: %10.6f ms)\n" |
ysr@777 | 1597 | " CH Strong: %10.6f ms (avg: %10.6f ms)\n" |
ysr@777 | 1598 | " G1 Strong: %10.6f ms (avg: %10.6f ms)\n" |
ysr@777 | 1599 | " Evac: %10.6f ms (avg: %10.6f ms)\n" |
ysr@777 | 1600 | " ET-RS: %10.6f ms (avg: %10.6f ms)\n" |
ysr@777 | 1601 | " |RS|: " SIZE_FORMAT, |
ysr@777 | 1602 | elapsed_ms, recent_avg_time_for_pauses_ms(), |
ysr@777 | 1603 | _cur_CH_strong_roots_dur_ms, recent_avg_time_for_CH_strong_ms(), |
ysr@777 | 1604 | _cur_G1_strong_roots_dur_ms, recent_avg_time_for_G1_strong_ms(), |
ysr@777 | 1605 | evac_ms, recent_avg_time_for_evac_ms(), |
ysr@777 | 1606 | scan_rs_time, |
ysr@777 | 1607 | recent_avg_time_for_pauses_ms() - |
ysr@777 | 1608 | recent_avg_time_for_G1_strong_ms(), |
ysr@777 | 1609 | rs_size); |
ysr@777 | 1610 | |
ysr@777 | 1611 | gclog_or_tty->print_cr(" Used at start: " SIZE_FORMAT"K" |
ysr@777 | 1612 | " At end " SIZE_FORMAT "K\n" |
ysr@777 | 1613 | " garbage : " SIZE_FORMAT "K" |
ysr@777 | 1614 | " of " SIZE_FORMAT "K\n" |
ysr@777 | 1615 | " survival : %6.2f%% (%6.2f%% avg)", |
ysr@777 | 1616 | _cur_collection_pause_used_at_start_bytes/K, |
ysr@777 | 1617 | _g1->used()/K, freed_bytes/K, |
ysr@777 | 1618 | _collection_set_bytes_used_before/K, |
ysr@777 | 1619 | survival_fraction*100.0, |
ysr@777 | 1620 | recent_avg_survival_fraction()*100.0); |
ysr@777 | 1621 | gclog_or_tty->print_cr(" Recent %% gc pause time: %6.2f", |
ysr@777 | 1622 | recent_avg_pause_time_ratio() * 100.0); |
ysr@777 | 1623 | } |
ysr@777 | 1624 | |
ysr@777 | 1625 | double other_time_ms = elapsed_ms; |
ysr@777 | 1626 | |
ysr@777 | 1627 | if (!abandoned) { |
ysr@777 | 1628 | if (_satb_drain_time_set) |
ysr@777 | 1629 | other_time_ms -= _cur_satb_drain_time_ms; |
ysr@777 | 1630 | |
ysr@777 | 1631 | if (parallel) |
ysr@777 | 1632 | other_time_ms -= _cur_collection_par_time_ms + _cur_clear_ct_time_ms; |
ysr@777 | 1633 | else |
ysr@777 | 1634 | other_time_ms -= |
ysr@777 | 1635 | update_rs_time + |
ysr@777 | 1636 | ext_root_scan_time + mark_stack_scan_time + scan_only_time + |
ysr@777 | 1637 | scan_rs_time + obj_copy_time; |
ysr@777 | 1638 | } |
ysr@777 | 1639 | |
ysr@777 | 1640 | if (PrintGCDetails) { |
ysr@777 | 1641 | gclog_or_tty->print_cr("%s%s, %1.8lf secs]", |
apetrusenko@1112 | 1642 | abandoned ? " (abandoned)" : "", |
ysr@777 | 1643 | (last_pause_included_initial_mark) ? " (initial-mark)" : "", |
ysr@777 | 1644 | elapsed_ms / 1000.0); |
ysr@777 | 1645 | |
ysr@777 | 1646 | if (!abandoned) { |
apetrusenko@1112 | 1647 | if (_satb_drain_time_set) { |
ysr@777 | 1648 | print_stats(1, "SATB Drain Time", _cur_satb_drain_time_ms); |
apetrusenko@1112 | 1649 | } |
apetrusenko@1112 | 1650 | if (_last_satb_drain_processed_buffers >= 0) { |
ysr@777 | 1651 | print_stats(2, "Processed Buffers", _last_satb_drain_processed_buffers); |
apetrusenko@1112 | 1652 | } |
apetrusenko@1112 | 1653 | if (parallel) { |
apetrusenko@1112 | 1654 | print_stats(1, "Parallel Time", _cur_collection_par_time_ms); |
apetrusenko@1112 | 1655 | print_par_stats(2, "Update RS (Start)", _par_last_update_rs_start_times_ms, false); |
apetrusenko@1112 | 1656 | print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); |
iveresov@1229 | 1657 | print_par_buffers(3, "Processed Buffers", |
iveresov@1229 | 1658 | _par_last_update_rs_processed_buffers, true); |
ysr@777 | 1659 | print_par_stats(2, "Ext Root Scanning", _par_last_ext_root_scan_times_ms); |
ysr@777 | 1660 | print_par_stats(2, "Mark Stack Scanning", _par_last_mark_stack_scan_times_ms); |
ysr@777 | 1661 | print_par_stats(2, "Scan-Only Scanning", _par_last_scan_only_times_ms); |
ysr@777 | 1662 | print_par_buffers(3, "Scan-Only Regions", |
ysr@777 | 1663 | _par_last_scan_only_regions_scanned, true); |
ysr@777 | 1664 | print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms); |
ysr@777 | 1665 | print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms); |
ysr@777 | 1666 | print_par_stats(2, "Termination", _par_last_termination_times_ms); |
ysr@777 | 1667 | print_stats(2, "Other", parallel_other_time); |
ysr@777 | 1668 | print_stats(1, "Clear CT", _cur_clear_ct_time_ms); |
apetrusenko@1112 | 1669 | } else { |
apetrusenko@1112 | 1670 | print_stats(1, "Update RS", update_rs_time); |
iveresov@1229 | 1671 | print_stats(2, "Processed Buffers", |
iveresov@1229 | 1672 | (int)update_rs_processed_buffers); |
ysr@777 | 1673 | print_stats(1, "Ext Root Scanning", ext_root_scan_time); |
ysr@777 | 1674 | print_stats(1, "Mark Stack Scanning", mark_stack_scan_time); |
ysr@777 | 1675 | print_stats(1, "Scan-Only Scanning", scan_only_time); |
ysr@777 | 1676 | print_stats(1, "Scan RS", scan_rs_time); |
ysr@777 | 1677 | print_stats(1, "Object Copying", obj_copy_time); |
ysr@777 | 1678 | } |
ysr@777 | 1679 | } |
johnc@1325 | 1680 | #ifndef PRODUCT |
johnc@1325 | 1681 | print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms); |
johnc@1325 | 1682 | print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms); |
johnc@1325 | 1683 | print_stats(1, "Min Clear CC", _min_clear_cc_time_ms); |
johnc@1325 | 1684 | print_stats(1, "Max Clear CC", _max_clear_cc_time_ms); |
johnc@1325 | 1685 | if (_num_cc_clears > 0) { |
johnc@1325 | 1686 | print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears)); |
johnc@1325 | 1687 | } |
johnc@1325 | 1688 | #endif |
ysr@777 | 1689 | print_stats(1, "Other", other_time_ms); |
ysr@777 | 1690 | for (int i = 0; i < _aux_num; ++i) { |
ysr@777 | 1691 | if (_cur_aux_times_set[i]) { |
ysr@777 | 1692 | char buffer[96]; |
ysr@777 | 1693 | sprintf(buffer, "Aux%d", i); |
ysr@777 | 1694 | print_stats(1, buffer, _cur_aux_times_ms[i]); |
ysr@777 | 1695 | } |
ysr@777 | 1696 | } |
ysr@777 | 1697 | } |
ysr@777 | 1698 | if (PrintGCDetails) |
ysr@777 | 1699 | gclog_or_tty->print(" ["); |
ysr@777 | 1700 | if (PrintGC || PrintGCDetails) |
ysr@777 | 1701 | _g1->print_size_transition(gclog_or_tty, |
ysr@777 | 1702 | _cur_collection_pause_used_at_start_bytes, |
ysr@777 | 1703 | _g1->used(), _g1->capacity()); |
ysr@777 | 1704 | if (PrintGCDetails) |
ysr@777 | 1705 | gclog_or_tty->print_cr("]"); |
ysr@777 | 1706 | |
ysr@777 | 1707 | _all_pause_times_ms->add(elapsed_ms); |
tonyp@1083 | 1708 | if (update_stats) { |
tonyp@1083 | 1709 | summary->record_total_time_ms(elapsed_ms); |
tonyp@1083 | 1710 | summary->record_other_time_ms(other_time_ms); |
tonyp@1083 | 1711 | } |
ysr@777 | 1712 | for (int i = 0; i < _aux_num; ++i) |
ysr@777 | 1713 | if (_cur_aux_times_set[i]) |
ysr@777 | 1714 | _all_aux_times_ms[i].add(_cur_aux_times_ms[i]); |
ysr@777 | 1715 | |
ysr@777 | 1716 | // Reset marks-between-pauses counter. |
ysr@777 | 1717 | _n_marks_since_last_pause = 0; |
ysr@777 | 1718 | |
ysr@777 | 1719 | // Update the efficiency-since-mark vars. |
ysr@777 | 1720 | double proc_ms = elapsed_ms * (double) _parallel_gc_threads; |
ysr@777 | 1721 | if (elapsed_ms < MIN_TIMER_GRANULARITY) { |
ysr@777 | 1722 | // This usually happens due to the timer not having the required |
ysr@777 | 1723 | // granularity. Some Linuxes are the usual culprits. |
ysr@777 | 1724 | // We'll just set it to something (arbitrarily) small. |
ysr@777 | 1725 | proc_ms = 1.0; |
ysr@777 | 1726 | } |
ysr@777 | 1727 | double cur_efficiency = (double) freed_bytes / proc_ms; |
ysr@777 | 1728 | |
ysr@777 | 1729 | bool new_in_marking_window = _in_marking_window; |
ysr@777 | 1730 | bool new_in_marking_window_im = false; |
ysr@777 | 1731 | if (_should_initiate_conc_mark) { |
ysr@777 | 1732 | new_in_marking_window = true; |
ysr@777 | 1733 | new_in_marking_window_im = true; |
ysr@777 | 1734 | } |
ysr@777 | 1735 | |
ysr@777 | 1736 | if (in_young_gc_mode()) { |
ysr@777 | 1737 | if (_last_full_young_gc) { |
ysr@777 | 1738 | set_full_young_gcs(false); |
ysr@777 | 1739 | _last_full_young_gc = false; |
ysr@777 | 1740 | } |
ysr@777 | 1741 | |
ysr@777 | 1742 | if ( !_last_young_gc_full ) { |
ysr@777 | 1743 | if ( _should_revert_to_full_young_gcs || |
ysr@777 | 1744 | _known_garbage_ratio < 0.05 || |
ysr@777 | 1745 | (adaptive_young_list_length() && |
ysr@777 | 1746 | (get_gc_eff_factor() * cur_efficiency < predict_young_gc_eff())) ) { |
ysr@777 | 1747 | set_full_young_gcs(true); |
ysr@777 | 1748 | } |
ysr@777 | 1749 | } |
ysr@777 | 1750 | _should_revert_to_full_young_gcs = false; |
ysr@777 | 1751 | |
ysr@777 | 1752 | if (_last_young_gc_full && !_during_marking) |
ysr@777 | 1753 | _young_gc_eff_seq->add(cur_efficiency); |
ysr@777 | 1754 | } |
ysr@777 | 1755 | |
ysr@777 | 1756 | _short_lived_surv_rate_group->start_adding_regions(); |
ysr@777 | 1757 | // do that for any other surv rate groupsx |
ysr@777 | 1758 | |
ysr@777 | 1759 | // <NEW PREDICTION> |
ysr@777 | 1760 | |
apetrusenko@1112 | 1761 | if (update_stats) { |
ysr@777 | 1762 | double pause_time_ms = elapsed_ms; |
ysr@777 | 1763 | |
ysr@777 | 1764 | size_t diff = 0; |
ysr@777 | 1765 | if (_max_pending_cards >= _pending_cards) |
ysr@777 | 1766 | diff = _max_pending_cards - _pending_cards; |
ysr@777 | 1767 | _pending_card_diff_seq->add((double) diff); |
ysr@777 | 1768 | |
ysr@777 | 1769 | double cost_per_card_ms = 0.0; |
ysr@777 | 1770 | if (_pending_cards > 0) { |
ysr@777 | 1771 | cost_per_card_ms = update_rs_time / (double) _pending_cards; |
ysr@777 | 1772 | _cost_per_card_ms_seq->add(cost_per_card_ms); |
ysr@777 | 1773 | } |
ysr@777 | 1774 | |
ysr@777 | 1775 | double cost_per_scan_only_region_ms = 0.0; |
ysr@777 | 1776 | if (scan_only_regions_scanned > 0.0) { |
ysr@777 | 1777 | cost_per_scan_only_region_ms = |
ysr@777 | 1778 | scan_only_time / scan_only_regions_scanned; |
ysr@777 | 1779 | if (_in_marking_window_im) |
ysr@777 | 1780 | _cost_per_scan_only_region_ms_during_cm_seq->add(cost_per_scan_only_region_ms); |
ysr@777 | 1781 | else |
ysr@777 | 1782 | _cost_per_scan_only_region_ms_seq->add(cost_per_scan_only_region_ms); |
ysr@777 | 1783 | } |
ysr@777 | 1784 | |
ysr@777 | 1785 | size_t cards_scanned = _g1->cards_scanned(); |
ysr@777 | 1786 | |
ysr@777 | 1787 | double cost_per_entry_ms = 0.0; |
ysr@777 | 1788 | if (cards_scanned > 10) { |
ysr@777 | 1789 | cost_per_entry_ms = scan_rs_time / (double) cards_scanned; |
ysr@777 | 1790 | if (_last_young_gc_full) |
ysr@777 | 1791 | _cost_per_entry_ms_seq->add(cost_per_entry_ms); |
ysr@777 | 1792 | else |
ysr@777 | 1793 | _partially_young_cost_per_entry_ms_seq->add(cost_per_entry_ms); |
ysr@777 | 1794 | } |
ysr@777 | 1795 | |
ysr@777 | 1796 | if (_max_rs_lengths > 0) { |
ysr@777 | 1797 | double cards_per_entry_ratio = |
ysr@777 | 1798 | (double) cards_scanned / (double) _max_rs_lengths; |
ysr@777 | 1799 | if (_last_young_gc_full) |
ysr@777 | 1800 | _fully_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); |
ysr@777 | 1801 | else |
ysr@777 | 1802 | _partially_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); |
ysr@777 | 1803 | } |
ysr@777 | 1804 | |
ysr@777 | 1805 | size_t rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; |
ysr@777 | 1806 | if (rs_length_diff >= 0) |
ysr@777 | 1807 | _rs_length_diff_seq->add((double) rs_length_diff); |
ysr@777 | 1808 | |
ysr@777 | 1809 | size_t copied_bytes = surviving_bytes; |
ysr@777 | 1810 | double cost_per_byte_ms = 0.0; |
ysr@777 | 1811 | if (copied_bytes > 0) { |
ysr@777 | 1812 | cost_per_byte_ms = obj_copy_time / (double) copied_bytes; |
ysr@777 | 1813 | if (_in_marking_window) |
ysr@777 | 1814 | _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); |
ysr@777 | 1815 | else |
ysr@777 | 1816 | _cost_per_byte_ms_seq->add(cost_per_byte_ms); |
ysr@777 | 1817 | } |
ysr@777 | 1818 | |
ysr@777 | 1819 | double all_other_time_ms = pause_time_ms - |
ysr@777 | 1820 | (update_rs_time + scan_only_time + scan_rs_time + obj_copy_time + |
ysr@777 | 1821 | _mark_closure_time_ms + termination_time); |
ysr@777 | 1822 | |
ysr@777 | 1823 | double young_other_time_ms = 0.0; |
ysr@777 | 1824 | if (_recorded_young_regions > 0) { |
ysr@777 | 1825 | young_other_time_ms = |
ysr@777 | 1826 | _recorded_young_cset_choice_time_ms + |
ysr@777 | 1827 | _recorded_young_free_cset_time_ms; |
ysr@777 | 1828 | _young_other_cost_per_region_ms_seq->add(young_other_time_ms / |
ysr@777 | 1829 | (double) _recorded_young_regions); |
ysr@777 | 1830 | } |
ysr@777 | 1831 | double non_young_other_time_ms = 0.0; |
ysr@777 | 1832 | if (_recorded_non_young_regions > 0) { |
ysr@777 | 1833 | non_young_other_time_ms = |
ysr@777 | 1834 | _recorded_non_young_cset_choice_time_ms + |
ysr@777 | 1835 | _recorded_non_young_free_cset_time_ms; |
ysr@777 | 1836 | |
ysr@777 | 1837 | _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / |
ysr@777 | 1838 | (double) _recorded_non_young_regions); |
ysr@777 | 1839 | } |
ysr@777 | 1840 | |
ysr@777 | 1841 | double constant_other_time_ms = all_other_time_ms - |
ysr@777 | 1842 | (young_other_time_ms + non_young_other_time_ms); |
ysr@777 | 1843 | _constant_other_time_ms_seq->add(constant_other_time_ms); |
ysr@777 | 1844 | |
ysr@777 | 1845 | double survival_ratio = 0.0; |
ysr@777 | 1846 | if (_bytes_in_collection_set_before_gc > 0) { |
ysr@777 | 1847 | survival_ratio = (double) bytes_in_to_space_during_gc() / |
ysr@777 | 1848 | (double) _bytes_in_collection_set_before_gc; |
ysr@777 | 1849 | } |
ysr@777 | 1850 | |
ysr@777 | 1851 | _pending_cards_seq->add((double) _pending_cards); |
ysr@777 | 1852 | _scanned_cards_seq->add((double) cards_scanned); |
ysr@777 | 1853 | _rs_lengths_seq->add((double) _max_rs_lengths); |
ysr@777 | 1854 | |
ysr@777 | 1855 | double expensive_region_limit_ms = |
johnc@1186 | 1856 | (double) MaxGCPauseMillis - predict_constant_other_time_ms(); |
ysr@777 | 1857 | if (expensive_region_limit_ms < 0.0) { |
ysr@777 | 1858 | // this means that the other time was predicted to be longer than |
ysr@777 | 1859 | // than the max pause time |
johnc@1186 | 1860 | expensive_region_limit_ms = (double) MaxGCPauseMillis; |
ysr@777 | 1861 | } |
ysr@777 | 1862 | _expensive_region_limit_ms = expensive_region_limit_ms; |
ysr@777 | 1863 | |
ysr@777 | 1864 | if (PREDICTIONS_VERBOSE) { |
ysr@777 | 1865 | gclog_or_tty->print_cr(""); |
ysr@777 | 1866 | gclog_or_tty->print_cr("PREDICTIONS %1.4lf %d " |
ysr@777 | 1867 | "REGIONS %d %d %d %d " |
ysr@777 | 1868 | "PENDING_CARDS %d %d " |
ysr@777 | 1869 | "CARDS_SCANNED %d %d " |
ysr@777 | 1870 | "RS_LENGTHS %d %d " |
ysr@777 | 1871 | "SCAN_ONLY_SCAN %1.6lf %1.6lf " |
ysr@777 | 1872 | "RS_UPDATE %1.6lf %1.6lf RS_SCAN %1.6lf %1.6lf " |
ysr@777 | 1873 | "SURVIVAL_RATIO %1.6lf %1.6lf " |
ysr@777 | 1874 | "OBJECT_COPY %1.6lf %1.6lf OTHER_CONSTANT %1.6lf %1.6lf " |
ysr@777 | 1875 | "OTHER_YOUNG %1.6lf %1.6lf " |
ysr@777 | 1876 | "OTHER_NON_YOUNG %1.6lf %1.6lf " |
ysr@777 | 1877 | "VTIME_DIFF %1.6lf TERMINATION %1.6lf " |
ysr@777 | 1878 | "ELAPSED %1.6lf %1.6lf ", |
ysr@777 | 1879 | _cur_collection_start_sec, |
ysr@777 | 1880 | (!_last_young_gc_full) ? 2 : |
ysr@777 | 1881 | (last_pause_included_initial_mark) ? 1 : 0, |
ysr@777 | 1882 | _recorded_region_num, |
ysr@777 | 1883 | _recorded_young_regions, |
ysr@777 | 1884 | _recorded_scan_only_regions, |
ysr@777 | 1885 | _recorded_non_young_regions, |
ysr@777 | 1886 | _predicted_pending_cards, _pending_cards, |
ysr@777 | 1887 | _predicted_cards_scanned, cards_scanned, |
ysr@777 | 1888 | _predicted_rs_lengths, _max_rs_lengths, |
ysr@777 | 1889 | _predicted_scan_only_scan_time_ms, scan_only_time, |
ysr@777 | 1890 | _predicted_rs_update_time_ms, update_rs_time, |
ysr@777 | 1891 | _predicted_rs_scan_time_ms, scan_rs_time, |
ysr@777 | 1892 | _predicted_survival_ratio, survival_ratio, |
ysr@777 | 1893 | _predicted_object_copy_time_ms, obj_copy_time, |
ysr@777 | 1894 | _predicted_constant_other_time_ms, constant_other_time_ms, |
ysr@777 | 1895 | _predicted_young_other_time_ms, young_other_time_ms, |
ysr@777 | 1896 | _predicted_non_young_other_time_ms, |
ysr@777 | 1897 | non_young_other_time_ms, |
ysr@777 | 1898 | _vtime_diff_ms, termination_time, |
ysr@777 | 1899 | _predicted_pause_time_ms, elapsed_ms); |
ysr@777 | 1900 | } |
ysr@777 | 1901 | |
ysr@777 | 1902 | if (G1PolicyVerbose > 0) { |
ysr@777 | 1903 | gclog_or_tty->print_cr("Pause Time, predicted: %1.4lfms (predicted %s), actual: %1.4lfms", |
ysr@777 | 1904 | _predicted_pause_time_ms, |
ysr@777 | 1905 | (_within_target) ? "within" : "outside", |
ysr@777 | 1906 | elapsed_ms); |
ysr@777 | 1907 | } |
ysr@777 | 1908 | |
ysr@777 | 1909 | } |
ysr@777 | 1910 | |
ysr@777 | 1911 | _in_marking_window = new_in_marking_window; |
ysr@777 | 1912 | _in_marking_window_im = new_in_marking_window_im; |
ysr@777 | 1913 | _free_regions_at_end_of_collection = _g1->free_regions(); |
ysr@777 | 1914 | _scan_only_regions_at_end_of_collection = _g1->young_list_length(); |
ysr@777 | 1915 | calculate_young_list_min_length(); |
ysr@777 | 1916 | calculate_young_list_target_config(); |
ysr@777 | 1917 | |
iveresov@1546 | 1918 | // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
iveresov@1546 | 1919 | double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSUpdatePauseFractionPercent / 100.0; |
iveresov@1546 | 1920 | adjust_concurrent_refinement(update_rs_time, update_rs_processed_buffers, update_rs_time_goal_ms); |
iveresov@1546 | 1921 | |
ysr@777 | 1922 | // </NEW PREDICTION> |
ysr@777 | 1923 | |
ysr@777 | 1924 | _target_pause_time_ms = -1.0; |
ysr@777 | 1925 | } |
ysr@777 | 1926 | |
ysr@777 | 1927 | // <NEW PREDICTION> |
ysr@777 | 1928 | |
iveresov@1546 | 1929 | void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
iveresov@1546 | 1930 | double update_rs_processed_buffers, |
iveresov@1546 | 1931 | double goal_ms) { |
iveresov@1546 | 1932 | DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
iveresov@1546 | 1933 | ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); |
iveresov@1546 | 1934 | |
iveresov@1546 | 1935 | if (G1AdaptiveConcRefine) { |
iveresov@1546 | 1936 | const int k_gy = 3, k_gr = 6; |
iveresov@1546 | 1937 | const double inc_k = 1.1, dec_k = 0.9; |
iveresov@1546 | 1938 | |
iveresov@1546 | 1939 | int g = cg1r->green_zone(); |
iveresov@1546 | 1940 | if (update_rs_time > goal_ms) { |
iveresov@1546 | 1941 | g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. |
iveresov@1546 | 1942 | } else { |
iveresov@1546 | 1943 | if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { |
iveresov@1546 | 1944 | g = (int)MAX2(g * inc_k, g + 1.0); |
iveresov@1546 | 1945 | } |
iveresov@1546 | 1946 | } |
iveresov@1546 | 1947 | // Change the refinement threads params |
iveresov@1546 | 1948 | cg1r->set_green_zone(g); |
iveresov@1546 | 1949 | cg1r->set_yellow_zone(g * k_gy); |
iveresov@1546 | 1950 | cg1r->set_red_zone(g * k_gr); |
iveresov@1546 | 1951 | cg1r->reinitialize_threads(); |
iveresov@1546 | 1952 | |
iveresov@1546 | 1953 | int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); |
iveresov@1546 | 1954 | int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, |
iveresov@1546 | 1955 | cg1r->yellow_zone()); |
iveresov@1546 | 1956 | // Change the barrier params |
iveresov@1546 | 1957 | dcqs.set_process_completed_threshold(processing_threshold); |
iveresov@1546 | 1958 | dcqs.set_max_completed_queue(cg1r->red_zone()); |
iveresov@1546 | 1959 | } |
iveresov@1546 | 1960 | |
iveresov@1546 | 1961 | int curr_queue_size = dcqs.completed_buffers_num(); |
iveresov@1546 | 1962 | if (curr_queue_size >= cg1r->yellow_zone()) { |
iveresov@1546 | 1963 | dcqs.set_completed_queue_padding(curr_queue_size); |
iveresov@1546 | 1964 | } else { |
iveresov@1546 | 1965 | dcqs.set_completed_queue_padding(0); |
iveresov@1546 | 1966 | } |
iveresov@1546 | 1967 | dcqs.notify_if_necessary(); |
iveresov@1546 | 1968 | } |
iveresov@1546 | 1969 | |
ysr@777 | 1970 | double |
ysr@777 | 1971 | G1CollectorPolicy:: |
ysr@777 | 1972 | predict_young_collection_elapsed_time_ms(size_t adjustment) { |
ysr@777 | 1973 | guarantee( adjustment == 0 || adjustment == 1, "invariant" ); |
ysr@777 | 1974 | |
ysr@777 | 1975 | G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
ysr@777 | 1976 | size_t young_num = g1h->young_list_length(); |
ysr@777 | 1977 | if (young_num == 0) |
ysr@777 | 1978 | return 0.0; |
ysr@777 | 1979 | |
ysr@777 | 1980 | young_num += adjustment; |
ysr@777 | 1981 | size_t pending_cards = predict_pending_cards(); |
ysr@777 | 1982 | size_t rs_lengths = g1h->young_list_sampled_rs_lengths() + |
ysr@777 | 1983 | predict_rs_length_diff(); |
ysr@777 | 1984 | size_t card_num; |
ysr@777 | 1985 | if (full_young_gcs()) |
ysr@777 | 1986 | card_num = predict_young_card_num(rs_lengths); |
ysr@777 | 1987 | else |
ysr@777 | 1988 | card_num = predict_non_young_card_num(rs_lengths); |
ysr@777 | 1989 | size_t young_byte_size = young_num * HeapRegion::GrainBytes; |
ysr@777 | 1990 | double accum_yg_surv_rate = |
ysr@777 | 1991 | _short_lived_surv_rate_group->accum_surv_rate(adjustment); |
ysr@777 | 1992 | |
ysr@777 | 1993 | size_t bytes_to_copy = |
ysr@777 | 1994 | (size_t) (accum_yg_surv_rate * (double) HeapRegion::GrainBytes); |
ysr@777 | 1995 | |
ysr@777 | 1996 | return |
ysr@777 | 1997 | predict_rs_update_time_ms(pending_cards) + |
ysr@777 | 1998 | predict_rs_scan_time_ms(card_num) + |
ysr@777 | 1999 | predict_object_copy_time_ms(bytes_to_copy) + |
ysr@777 | 2000 | predict_young_other_time_ms(young_num) + |
ysr@777 | 2001 | predict_constant_other_time_ms(); |
ysr@777 | 2002 | } |
ysr@777 | 2003 | |
ysr@777 | 2004 | double |
ysr@777 | 2005 | G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { |
ysr@777 | 2006 | size_t rs_length = predict_rs_length_diff(); |
ysr@777 | 2007 | size_t card_num; |
ysr@777 | 2008 | if (full_young_gcs()) |
ysr@777 | 2009 | card_num = predict_young_card_num(rs_length); |
ysr@777 | 2010 | else |
ysr@777 | 2011 | card_num = predict_non_young_card_num(rs_length); |
ysr@777 | 2012 | return predict_base_elapsed_time_ms(pending_cards, card_num); |
ysr@777 | 2013 | } |
ysr@777 | 2014 | |
ysr@777 | 2015 | double |
ysr@777 | 2016 | G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, |
ysr@777 | 2017 | size_t scanned_cards) { |
ysr@777 | 2018 | return |
ysr@777 | 2019 | predict_rs_update_time_ms(pending_cards) + |
ysr@777 | 2020 | predict_rs_scan_time_ms(scanned_cards) + |
ysr@777 | 2021 | predict_constant_other_time_ms(); |
ysr@777 | 2022 | } |
ysr@777 | 2023 | |
ysr@777 | 2024 | double |
ysr@777 | 2025 | G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, |
ysr@777 | 2026 | bool young) { |
ysr@777 | 2027 | size_t rs_length = hr->rem_set()->occupied(); |
ysr@777 | 2028 | size_t card_num; |
ysr@777 | 2029 | if (full_young_gcs()) |
ysr@777 | 2030 | card_num = predict_young_card_num(rs_length); |
ysr@777 | 2031 | else |
ysr@777 | 2032 | card_num = predict_non_young_card_num(rs_length); |
ysr@777 | 2033 | size_t bytes_to_copy = predict_bytes_to_copy(hr); |
ysr@777 | 2034 | |
ysr@777 | 2035 | double region_elapsed_time_ms = |
ysr@777 | 2036 | predict_rs_scan_time_ms(card_num) + |
ysr@777 | 2037 | predict_object_copy_time_ms(bytes_to_copy); |
ysr@777 | 2038 | |
ysr@777 | 2039 | if (young) |
ysr@777 | 2040 | region_elapsed_time_ms += predict_young_other_time_ms(1); |
ysr@777 | 2041 | else |
ysr@777 | 2042 | region_elapsed_time_ms += predict_non_young_other_time_ms(1); |
ysr@777 | 2043 | |
ysr@777 | 2044 | return region_elapsed_time_ms; |
ysr@777 | 2045 | } |
ysr@777 | 2046 | |
ysr@777 | 2047 | size_t |
ysr@777 | 2048 | G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { |
ysr@777 | 2049 | size_t bytes_to_copy; |
ysr@777 | 2050 | if (hr->is_marked()) |
ysr@777 | 2051 | bytes_to_copy = hr->max_live_bytes(); |
ysr@777 | 2052 | else { |
ysr@777 | 2053 | guarantee( hr->is_young() && hr->age_in_surv_rate_group() != -1, |
ysr@777 | 2054 | "invariant" ); |
ysr@777 | 2055 | int age = hr->age_in_surv_rate_group(); |
apetrusenko@980 | 2056 | double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
ysr@777 | 2057 | bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
ysr@777 | 2058 | } |
ysr@777 | 2059 | |
ysr@777 | 2060 | return bytes_to_copy; |
ysr@777 | 2061 | } |
ysr@777 | 2062 | |
ysr@777 | 2063 | void |
ysr@777 | 2064 | G1CollectorPolicy::start_recording_regions() { |
ysr@777 | 2065 | _recorded_rs_lengths = 0; |
ysr@777 | 2066 | _recorded_scan_only_regions = 0; |
ysr@777 | 2067 | _recorded_young_regions = 0; |
ysr@777 | 2068 | _recorded_non_young_regions = 0; |
ysr@777 | 2069 | |
ysr@777 | 2070 | #if PREDICTIONS_VERBOSE |
ysr@777 | 2071 | _predicted_rs_lengths = 0; |
ysr@777 | 2072 | _predicted_cards_scanned = 0; |
ysr@777 | 2073 | |
ysr@777 | 2074 | _recorded_marked_bytes = 0; |
ysr@777 | 2075 | _recorded_young_bytes = 0; |
ysr@777 | 2076 | _predicted_bytes_to_copy = 0; |
ysr@777 | 2077 | #endif // PREDICTIONS_VERBOSE |
ysr@777 | 2078 | } |
ysr@777 | 2079 | |
ysr@777 | 2080 | void |
ysr@777 | 2081 | G1CollectorPolicy::record_cset_region(HeapRegion* hr, bool young) { |
ysr@777 | 2082 | if (young) { |
ysr@777 | 2083 | ++_recorded_young_regions; |
ysr@777 | 2084 | } else { |
ysr@777 | 2085 | ++_recorded_non_young_regions; |
ysr@777 | 2086 | } |
ysr@777 | 2087 | #if PREDICTIONS_VERBOSE |
ysr@777 | 2088 | if (young) { |
apetrusenko@980 | 2089 | _recorded_young_bytes += hr->used(); |
ysr@777 | 2090 | } else { |
ysr@777 | 2091 | _recorded_marked_bytes += hr->max_live_bytes(); |
ysr@777 | 2092 | } |
ysr@777 | 2093 | _predicted_bytes_to_copy += predict_bytes_to_copy(hr); |
ysr@777 | 2094 | #endif // PREDICTIONS_VERBOSE |
ysr@777 | 2095 | |
ysr@777 | 2096 | size_t rs_length = hr->rem_set()->occupied(); |
ysr@777 | 2097 | _recorded_rs_lengths += rs_length; |
ysr@777 | 2098 | } |
ysr@777 | 2099 | |
ysr@777 | 2100 | void |
ysr@777 | 2101 | G1CollectorPolicy::record_scan_only_regions(size_t scan_only_length) { |
ysr@777 | 2102 | _recorded_scan_only_regions = scan_only_length; |
ysr@777 | 2103 | } |
ysr@777 | 2104 | |
ysr@777 | 2105 | void |
ysr@777 | 2106 | G1CollectorPolicy::end_recording_regions() { |
ysr@777 | 2107 | #if PREDICTIONS_VERBOSE |
ysr@777 | 2108 | _predicted_pending_cards = predict_pending_cards(); |
ysr@777 | 2109 | _predicted_rs_lengths = _recorded_rs_lengths + predict_rs_length_diff(); |
ysr@777 | 2110 | if (full_young_gcs()) |
ysr@777 | 2111 | _predicted_cards_scanned += predict_young_card_num(_predicted_rs_lengths); |
ysr@777 | 2112 | else |
ysr@777 | 2113 | _predicted_cards_scanned += |
ysr@777 | 2114 | predict_non_young_card_num(_predicted_rs_lengths); |
ysr@777 | 2115 | _recorded_region_num = _recorded_young_regions + _recorded_non_young_regions; |
ysr@777 | 2116 | |
ysr@777 | 2117 | _predicted_scan_only_scan_time_ms = |
ysr@777 | 2118 | predict_scan_only_time_ms(_recorded_scan_only_regions); |
ysr@777 | 2119 | _predicted_rs_update_time_ms = |
ysr@777 | 2120 | predict_rs_update_time_ms(_g1->pending_card_num()); |
ysr@777 | 2121 | _predicted_rs_scan_time_ms = |
ysr@777 | 2122 | predict_rs_scan_time_ms(_predicted_cards_scanned); |
ysr@777 | 2123 | _predicted_object_copy_time_ms = |
ysr@777 | 2124 | predict_object_copy_time_ms(_predicted_bytes_to_copy); |
ysr@777 | 2125 | _predicted_constant_other_time_ms = |
ysr@777 | 2126 | predict_constant_other_time_ms(); |
ysr@777 | 2127 | _predicted_young_other_time_ms = |
ysr@777 | 2128 | predict_young_other_time_ms(_recorded_young_regions); |
ysr@777 | 2129 | _predicted_non_young_other_time_ms = |
ysr@777 | 2130 | predict_non_young_other_time_ms(_recorded_non_young_regions); |
ysr@777 | 2131 | |
ysr@777 | 2132 | _predicted_pause_time_ms = |
ysr@777 | 2133 | _predicted_scan_only_scan_time_ms + |
ysr@777 | 2134 | _predicted_rs_update_time_ms + |
ysr@777 | 2135 | _predicted_rs_scan_time_ms + |
ysr@777 | 2136 | _predicted_object_copy_time_ms + |
ysr@777 | 2137 | _predicted_constant_other_time_ms + |
ysr@777 | 2138 | _predicted_young_other_time_ms + |
ysr@777 | 2139 | _predicted_non_young_other_time_ms; |
ysr@777 | 2140 | #endif // PREDICTIONS_VERBOSE |
ysr@777 | 2141 | } |
ysr@777 | 2142 | |
ysr@777 | 2143 | void G1CollectorPolicy::check_if_region_is_too_expensive(double |
ysr@777 | 2144 | predicted_time_ms) { |
ysr@777 | 2145 | // I don't think we need to do this when in young GC mode since |
ysr@777 | 2146 | // marking will be initiated next time we hit the soft limit anyway... |
ysr@777 | 2147 | if (predicted_time_ms > _expensive_region_limit_ms) { |
ysr@777 | 2148 | if (!in_young_gc_mode()) { |
ysr@777 | 2149 | set_full_young_gcs(true); |
ysr@777 | 2150 | _should_initiate_conc_mark = true; |
ysr@777 | 2151 | } else |
ysr@777 | 2152 | // no point in doing another partial one |
ysr@777 | 2153 | _should_revert_to_full_young_gcs = true; |
ysr@777 | 2154 | } |
ysr@777 | 2155 | } |
ysr@777 | 2156 | |
ysr@777 | 2157 | // </NEW PREDICTION> |
ysr@777 | 2158 | |
ysr@777 | 2159 | |
ysr@777 | 2160 | void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, |
ysr@777 | 2161 | double elapsed_ms) { |
ysr@777 | 2162 | _recent_gc_times_ms->add(elapsed_ms); |
ysr@777 | 2163 | _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); |
ysr@777 | 2164 | _prev_collection_pause_end_ms = end_time_sec * 1000.0; |
ysr@777 | 2165 | } |
ysr@777 | 2166 | |
ysr@777 | 2167 | double G1CollectorPolicy::recent_avg_time_for_pauses_ms() { |
johnc@1186 | 2168 | if (_recent_pause_times_ms->num() == 0) return (double) MaxGCPauseMillis; |
ysr@777 | 2169 | else return _recent_pause_times_ms->avg(); |
ysr@777 | 2170 | } |
ysr@777 | 2171 | |
ysr@777 | 2172 | double G1CollectorPolicy::recent_avg_time_for_CH_strong_ms() { |
ysr@777 | 2173 | if (_recent_CH_strong_roots_times_ms->num() == 0) |
johnc@1186 | 2174 | return (double)MaxGCPauseMillis/3.0; |
ysr@777 | 2175 | else return _recent_CH_strong_roots_times_ms->avg(); |
ysr@777 | 2176 | } |
ysr@777 | 2177 | |
ysr@777 | 2178 | double G1CollectorPolicy::recent_avg_time_for_G1_strong_ms() { |
ysr@777 | 2179 | if (_recent_G1_strong_roots_times_ms->num() == 0) |
johnc@1186 | 2180 | return (double)MaxGCPauseMillis/3.0; |
ysr@777 | 2181 | else return _recent_G1_strong_roots_times_ms->avg(); |
ysr@777 | 2182 | } |
ysr@777 | 2183 | |
ysr@777 | 2184 | double G1CollectorPolicy::recent_avg_time_for_evac_ms() { |
johnc@1186 | 2185 | if (_recent_evac_times_ms->num() == 0) return (double)MaxGCPauseMillis/3.0; |
ysr@777 | 2186 | else return _recent_evac_times_ms->avg(); |
ysr@777 | 2187 | } |
ysr@777 | 2188 | |
ysr@777 | 2189 | int G1CollectorPolicy::number_of_recent_gcs() { |
ysr@777 | 2190 | assert(_recent_CH_strong_roots_times_ms->num() == |
ysr@777 | 2191 | _recent_G1_strong_roots_times_ms->num(), "Sequence out of sync"); |
ysr@777 | 2192 | assert(_recent_G1_strong_roots_times_ms->num() == |
ysr@777 | 2193 | _recent_evac_times_ms->num(), "Sequence out of sync"); |
ysr@777 | 2194 | assert(_recent_evac_times_ms->num() == |
ysr@777 | 2195 | _recent_pause_times_ms->num(), "Sequence out of sync"); |
ysr@777 | 2196 | assert(_recent_pause_times_ms->num() == |
ysr@777 | 2197 | _recent_CS_bytes_used_before->num(), "Sequence out of sync"); |
ysr@777 | 2198 | assert(_recent_CS_bytes_used_before->num() == |
ysr@777 | 2199 | _recent_CS_bytes_surviving->num(), "Sequence out of sync"); |
ysr@777 | 2200 | return _recent_pause_times_ms->num(); |
ysr@777 | 2201 | } |
ysr@777 | 2202 | |
ysr@777 | 2203 | double G1CollectorPolicy::recent_avg_survival_fraction() { |
ysr@777 | 2204 | return recent_avg_survival_fraction_work(_recent_CS_bytes_surviving, |
ysr@777 | 2205 | _recent_CS_bytes_used_before); |
ysr@777 | 2206 | } |
ysr@777 | 2207 | |
ysr@777 | 2208 | double G1CollectorPolicy::last_survival_fraction() { |
ysr@777 | 2209 | return last_survival_fraction_work(_recent_CS_bytes_surviving, |
ysr@777 | 2210 | _recent_CS_bytes_used_before); |
ysr@777 | 2211 | } |
ysr@777 | 2212 | |
ysr@777 | 2213 | double |
ysr@777 | 2214 | G1CollectorPolicy::recent_avg_survival_fraction_work(TruncatedSeq* surviving, |
ysr@777 | 2215 | TruncatedSeq* before) { |
ysr@777 | 2216 | assert(surviving->num() == before->num(), "Sequence out of sync"); |
ysr@777 | 2217 | if (before->sum() > 0.0) { |
ysr@777 | 2218 | double recent_survival_rate = surviving->sum() / before->sum(); |
ysr@777 | 2219 | // We exempt parallel collection from this check because Alloc Buffer |
ysr@777 | 2220 | // fragmentation can produce negative collections. |
ysr@777 | 2221 | // Further, we're now always doing parallel collection. But I'm still |
ysr@777 | 2222 | // leaving this here as a placeholder for a more precise assertion later. |
ysr@777 | 2223 | // (DLD, 10/05.) |
ysr@777 | 2224 | assert((true || ParallelGCThreads > 0) || |
ysr@777 | 2225 | _g1->evacuation_failed() || |
ysr@777 | 2226 | recent_survival_rate <= 1.0, "Or bad frac"); |
ysr@777 | 2227 | return recent_survival_rate; |
ysr@777 | 2228 | } else { |
ysr@777 | 2229 | return 1.0; // Be conservative. |
ysr@777 | 2230 | } |
ysr@777 | 2231 | } |
ysr@777 | 2232 | |
ysr@777 | 2233 | double |
ysr@777 | 2234 | G1CollectorPolicy::last_survival_fraction_work(TruncatedSeq* surviving, |
ysr@777 | 2235 | TruncatedSeq* before) { |
ysr@777 | 2236 | assert(surviving->num() == before->num(), "Sequence out of sync"); |
ysr@777 | 2237 | if (surviving->num() > 0 && before->last() > 0.0) { |
ysr@777 | 2238 | double last_survival_rate = surviving->last() / before->last(); |
ysr@777 | 2239 | // We exempt parallel collection from this check because Alloc Buffer |
ysr@777 | 2240 | // fragmentation can produce negative collections. |
ysr@777 | 2241 | // Further, we're now always doing parallel collection. But I'm still |
ysr@777 | 2242 | // leaving this here as a placeholder for a more precise assertion later. |
ysr@777 | 2243 | // (DLD, 10/05.) |
ysr@777 | 2244 | assert((true || ParallelGCThreads > 0) || |
ysr@777 | 2245 | last_survival_rate <= 1.0, "Or bad frac"); |
ysr@777 | 2246 | return last_survival_rate; |
ysr@777 | 2247 | } else { |
ysr@777 | 2248 | return 1.0; |
ysr@777 | 2249 | } |
ysr@777 | 2250 | } |
ysr@777 | 2251 | |
ysr@777 | 2252 | static const int survival_min_obs = 5; |
ysr@777 | 2253 | static double survival_min_obs_limits[] = { 0.9, 0.7, 0.5, 0.3, 0.1 }; |
ysr@777 | 2254 | static const double min_survival_rate = 0.1; |
ysr@777 | 2255 | |
ysr@777 | 2256 | double |
ysr@777 | 2257 | G1CollectorPolicy::conservative_avg_survival_fraction_work(double avg, |
ysr@777 | 2258 | double latest) { |
ysr@777 | 2259 | double res = avg; |
ysr@777 | 2260 | if (number_of_recent_gcs() < survival_min_obs) { |
ysr@777 | 2261 | res = MAX2(res, survival_min_obs_limits[number_of_recent_gcs()]); |
ysr@777 | 2262 | } |
ysr@777 | 2263 | res = MAX2(res, latest); |
ysr@777 | 2264 | res = MAX2(res, min_survival_rate); |
ysr@777 | 2265 | // In the parallel case, LAB fragmentation can produce "negative |
ysr@777 | 2266 | // collections"; so can evac failure. Cap at 1.0 |
ysr@777 | 2267 | res = MIN2(res, 1.0); |
ysr@777 | 2268 | return res; |
ysr@777 | 2269 | } |
ysr@777 | 2270 | |
ysr@777 | 2271 | size_t G1CollectorPolicy::expansion_amount() { |
johnc@1186 | 2272 | if ((int)(recent_avg_pause_time_ratio() * 100.0) > G1GCPercent) { |
johnc@1186 | 2273 | // We will double the existing space, or take |
johnc@1186 | 2274 | // G1ExpandByPercentOfAvailable % of the available expansion |
johnc@1186 | 2275 | // space, whichever is smaller, bounded below by a minimum |
johnc@1186 | 2276 | // expansion (unless that's all that's left.) |
ysr@777 | 2277 | const size_t min_expand_bytes = 1*M; |
ysr@777 | 2278 | size_t reserved_bytes = _g1->g1_reserved_obj_bytes(); |
ysr@777 | 2279 | size_t committed_bytes = _g1->capacity(); |
ysr@777 | 2280 | size_t uncommitted_bytes = reserved_bytes - committed_bytes; |
ysr@777 | 2281 | size_t expand_bytes; |
ysr@777 | 2282 | size_t expand_bytes_via_pct = |
johnc@1186 | 2283 | uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
ysr@777 | 2284 | expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
ysr@777 | 2285 | expand_bytes = MAX2(expand_bytes, min_expand_bytes); |
ysr@777 | 2286 | expand_bytes = MIN2(expand_bytes, uncommitted_bytes); |
ysr@777 | 2287 | if (G1PolicyVerbose > 1) { |
ysr@777 | 2288 | gclog_or_tty->print("Decided to expand: ratio = %5.2f, " |
ysr@777 | 2289 | "committed = %d%s, uncommited = %d%s, via pct = %d%s.\n" |
ysr@777 | 2290 | " Answer = %d.\n", |
ysr@777 | 2291 | recent_avg_pause_time_ratio(), |
ysr@777 | 2292 | byte_size_in_proper_unit(committed_bytes), |
ysr@777 | 2293 | proper_unit_for_byte_size(committed_bytes), |
ysr@777 | 2294 | byte_size_in_proper_unit(uncommitted_bytes), |
ysr@777 | 2295 | proper_unit_for_byte_size(uncommitted_bytes), |
ysr@777 | 2296 | byte_size_in_proper_unit(expand_bytes_via_pct), |
ysr@777 | 2297 | proper_unit_for_byte_size(expand_bytes_via_pct), |
ysr@777 | 2298 | byte_size_in_proper_unit(expand_bytes), |
ysr@777 | 2299 | proper_unit_for_byte_size(expand_bytes)); |
ysr@777 | 2300 | } |
ysr@777 | 2301 | return expand_bytes; |
ysr@777 | 2302 | } else { |
ysr@777 | 2303 | return 0; |
ysr@777 | 2304 | } |
ysr@777 | 2305 | } |
ysr@777 | 2306 | |
ysr@777 | 2307 | void G1CollectorPolicy::note_start_of_mark_thread() { |
ysr@777 | 2308 | _mark_thread_startup_sec = os::elapsedTime(); |
ysr@777 | 2309 | } |
ysr@777 | 2310 | |
ysr@777 | 2311 | class CountCSClosure: public HeapRegionClosure { |
ysr@777 | 2312 | G1CollectorPolicy* _g1_policy; |
ysr@777 | 2313 | public: |
ysr@777 | 2314 | CountCSClosure(G1CollectorPolicy* g1_policy) : |
ysr@777 | 2315 | _g1_policy(g1_policy) {} |
ysr@777 | 2316 | bool doHeapRegion(HeapRegion* r) { |
ysr@777 | 2317 | _g1_policy->_bytes_in_collection_set_before_gc += r->used(); |
ysr@777 | 2318 | return false; |
ysr@777 | 2319 | } |
ysr@777 | 2320 | }; |
ysr@777 | 2321 | |
ysr@777 | 2322 | void G1CollectorPolicy::count_CS_bytes_used() { |
ysr@777 | 2323 | CountCSClosure cs_closure(this); |
ysr@777 | 2324 | _g1->collection_set_iterate(&cs_closure); |
ysr@777 | 2325 | } |
ysr@777 | 2326 | |
ysr@777 | 2327 | static void print_indent(int level) { |
ysr@777 | 2328 | for (int j = 0; j < level+1; ++j) |
ysr@777 | 2329 | gclog_or_tty->print(" "); |
ysr@777 | 2330 | } |
ysr@777 | 2331 | |
ysr@777 | 2332 | void G1CollectorPolicy::print_summary (int level, |
ysr@777 | 2333 | const char* str, |
ysr@777 | 2334 | NumberSeq* seq) const { |
ysr@777 | 2335 | double sum = seq->sum(); |
ysr@777 | 2336 | print_indent(level); |
ysr@777 | 2337 | gclog_or_tty->print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", |
ysr@777 | 2338 | str, sum / 1000.0, seq->avg()); |
ysr@777 | 2339 | } |
ysr@777 | 2340 | |
ysr@777 | 2341 | void G1CollectorPolicy::print_summary_sd (int level, |
ysr@777 | 2342 | const char* str, |
ysr@777 | 2343 | NumberSeq* seq) const { |
ysr@777 | 2344 | print_summary(level, str, seq); |
ysr@777 | 2345 | print_indent(level + 5); |
ysr@777 | 2346 | gclog_or_tty->print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", |
ysr@777 | 2347 | seq->num(), seq->sd(), seq->maximum()); |
ysr@777 | 2348 | } |
ysr@777 | 2349 | |
ysr@777 | 2350 | void G1CollectorPolicy::check_other_times(int level, |
ysr@777 | 2351 | NumberSeq* other_times_ms, |
ysr@777 | 2352 | NumberSeq* calc_other_times_ms) const { |
ysr@777 | 2353 | bool should_print = false; |
ysr@777 | 2354 | |
ysr@777 | 2355 | double max_sum = MAX2(fabs(other_times_ms->sum()), |
ysr@777 | 2356 | fabs(calc_other_times_ms->sum())); |
ysr@777 | 2357 | double min_sum = MIN2(fabs(other_times_ms->sum()), |
ysr@777 | 2358 | fabs(calc_other_times_ms->sum())); |
ysr@777 | 2359 | double sum_ratio = max_sum / min_sum; |
ysr@777 | 2360 | if (sum_ratio > 1.1) { |
ysr@777 | 2361 | should_print = true; |
ysr@777 | 2362 | print_indent(level + 1); |
ysr@777 | 2363 | gclog_or_tty->print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); |
ysr@777 | 2364 | } |
ysr@777 | 2365 | |
ysr@777 | 2366 | double max_avg = MAX2(fabs(other_times_ms->avg()), |
ysr@777 | 2367 | fabs(calc_other_times_ms->avg())); |
ysr@777 | 2368 | double min_avg = MIN2(fabs(other_times_ms->avg()), |
ysr@777 | 2369 | fabs(calc_other_times_ms->avg())); |
ysr@777 | 2370 | double avg_ratio = max_avg / min_avg; |
ysr@777 | 2371 | if (avg_ratio > 1.1) { |
ysr@777 | 2372 | should_print = true; |
ysr@777 | 2373 | print_indent(level + 1); |
ysr@777 | 2374 | gclog_or_tty->print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); |
ysr@777 | 2375 | } |
ysr@777 | 2376 | |
ysr@777 | 2377 | if (other_times_ms->sum() < -0.01) { |
ysr@777 | 2378 | print_indent(level + 1); |
ysr@777 | 2379 | gclog_or_tty->print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); |
ysr@777 | 2380 | } |
ysr@777 | 2381 | |
ysr@777 | 2382 | if (other_times_ms->avg() < -0.01) { |
ysr@777 | 2383 | print_indent(level + 1); |
ysr@777 | 2384 | gclog_or_tty->print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); |
ysr@777 | 2385 | } |
ysr@777 | 2386 | |
ysr@777 | 2387 | if (calc_other_times_ms->sum() < -0.01) { |
ysr@777 | 2388 | should_print = true; |
ysr@777 | 2389 | print_indent(level + 1); |
ysr@777 | 2390 | gclog_or_tty->print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); |
ysr@777 | 2391 | } |
ysr@777 | 2392 | |
ysr@777 | 2393 | if (calc_other_times_ms->avg() < -0.01) { |
ysr@777 | 2394 | should_print = true; |
ysr@777 | 2395 | print_indent(level + 1); |
ysr@777 | 2396 | gclog_or_tty->print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); |
ysr@777 | 2397 | } |
ysr@777 | 2398 | |
ysr@777 | 2399 | if (should_print) |
ysr@777 | 2400 | print_summary(level, "Other(Calc)", calc_other_times_ms); |
ysr@777 | 2401 | } |
ysr@777 | 2402 | |
ysr@777 | 2403 | void G1CollectorPolicy::print_summary(PauseSummary* summary) const { |
ysr@777 | 2404 | bool parallel = ParallelGCThreads > 0; |
ysr@777 | 2405 | MainBodySummary* body_summary = summary->main_body_summary(); |
ysr@777 | 2406 | if (summary->get_total_seq()->num() > 0) { |
apetrusenko@1112 | 2407 | print_summary_sd(0, "Evacuation Pauses", summary->get_total_seq()); |
ysr@777 | 2408 | if (body_summary != NULL) { |
ysr@777 | 2409 | print_summary(1, "SATB Drain", body_summary->get_satb_drain_seq()); |
ysr@777 | 2410 | if (parallel) { |
ysr@777 | 2411 | print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); |
ysr@777 | 2412 | print_summary(2, "Update RS", body_summary->get_update_rs_seq()); |
ysr@777 | 2413 | print_summary(2, "Ext Root Scanning", |
ysr@777 | 2414 | body_summary->get_ext_root_scan_seq()); |
ysr@777 | 2415 | print_summary(2, "Mark Stack Scanning", |
ysr@777 | 2416 | body_summary->get_mark_stack_scan_seq()); |
ysr@777 | 2417 | print_summary(2, "Scan-Only Scanning", |
ysr@777 | 2418 | body_summary->get_scan_only_seq()); |
ysr@777 | 2419 | print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); |
ysr@777 | 2420 | print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); |
ysr@777 | 2421 | print_summary(2, "Termination", body_summary->get_termination_seq()); |
ysr@777 | 2422 | print_summary(2, "Other", body_summary->get_parallel_other_seq()); |
ysr@777 | 2423 | { |
ysr@777 | 2424 | NumberSeq* other_parts[] = { |
ysr@777 | 2425 | body_summary->get_update_rs_seq(), |
ysr@777 | 2426 | body_summary->get_ext_root_scan_seq(), |
ysr@777 | 2427 | body_summary->get_mark_stack_scan_seq(), |
ysr@777 | 2428 | body_summary->get_scan_only_seq(), |
ysr@777 | 2429 | body_summary->get_scan_rs_seq(), |
ysr@777 | 2430 | body_summary->get_obj_copy_seq(), |
ysr@777 | 2431 | body_summary->get_termination_seq() |
ysr@777 | 2432 | }; |
ysr@777 | 2433 | NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), |
ysr@777 | 2434 | 7, other_parts); |
ysr@777 | 2435 | check_other_times(2, body_summary->get_parallel_other_seq(), |
ysr@777 | 2436 | &calc_other_times_ms); |
ysr@777 | 2437 | } |
ysr@777 | 2438 | print_summary(1, "Mark Closure", body_summary->get_mark_closure_seq()); |
ysr@777 | 2439 | print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); |
ysr@777 | 2440 | } else { |
ysr@777 | 2441 | print_summary(1, "Update RS", body_summary->get_update_rs_seq()); |
ysr@777 | 2442 | print_summary(1, "Ext Root Scanning", |
ysr@777 | 2443 | body_summary->get_ext_root_scan_seq()); |
ysr@777 | 2444 | print_summary(1, "Mark Stack Scanning", |
ysr@777 | 2445 | body_summary->get_mark_stack_scan_seq()); |
ysr@777 | 2446 | print_summary(1, "Scan-Only Scanning", |
ysr@777 | 2447 | body_summary->get_scan_only_seq()); |
ysr@777 | 2448 | print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); |
ysr@777 | 2449 | print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); |
ysr@777 | 2450 | } |
ysr@777 | 2451 | } |
ysr@777 | 2452 | print_summary(1, "Other", summary->get_other_seq()); |
ysr@777 | 2453 | { |
ysr@777 | 2454 | NumberSeq calc_other_times_ms; |
ysr@777 | 2455 | if (body_summary != NULL) { |
ysr@777 | 2456 | // not abandoned |
ysr@777 | 2457 | if (parallel) { |
ysr@777 | 2458 | // parallel |
ysr@777 | 2459 | NumberSeq* other_parts[] = { |
ysr@777 | 2460 | body_summary->get_satb_drain_seq(), |
ysr@777 | 2461 | body_summary->get_parallel_seq(), |
ysr@777 | 2462 | body_summary->get_clear_ct_seq() |
ysr@777 | 2463 | }; |
apetrusenko@1112 | 2464 | calc_other_times_ms = NumberSeq(summary->get_total_seq(), |
apetrusenko@1112 | 2465 | 3, other_parts); |
ysr@777 | 2466 | } else { |
ysr@777 | 2467 | // serial |
ysr@777 | 2468 | NumberSeq* other_parts[] = { |
ysr@777 | 2469 | body_summary->get_satb_drain_seq(), |
ysr@777 | 2470 | body_summary->get_update_rs_seq(), |
ysr@777 | 2471 | body_summary->get_ext_root_scan_seq(), |
ysr@777 | 2472 | body_summary->get_mark_stack_scan_seq(), |
ysr@777 | 2473 | body_summary->get_scan_only_seq(), |
ysr@777 | 2474 | body_summary->get_scan_rs_seq(), |
ysr@777 | 2475 | body_summary->get_obj_copy_seq() |
ysr@777 | 2476 | }; |
ysr@777 | 2477 | calc_other_times_ms = NumberSeq(summary->get_total_seq(), |
apetrusenko@1112 | 2478 | 7, other_parts); |
ysr@777 | 2479 | } |
ysr@777 | 2480 | } else { |
ysr@777 | 2481 | // abandoned |
apetrusenko@1112 | 2482 | calc_other_times_ms = NumberSeq(); |
ysr@777 | 2483 | } |
ysr@777 | 2484 | check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); |
ysr@777 | 2485 | } |
ysr@777 | 2486 | } else { |
ysr@777 | 2487 | print_indent(0); |
ysr@777 | 2488 | gclog_or_tty->print_cr("none"); |
ysr@777 | 2489 | } |
ysr@777 | 2490 | gclog_or_tty->print_cr(""); |
ysr@777 | 2491 | } |
ysr@777 | 2492 | |
ysr@777 | 2493 | void |
apetrusenko@1112 | 2494 | G1CollectorPolicy::print_abandoned_summary(PauseSummary* summary) const { |
ysr@777 | 2495 | bool printed = false; |
apetrusenko@1112 | 2496 | if (summary->get_total_seq()->num() > 0) { |
ysr@777 | 2497 | printed = true; |
apetrusenko@1112 | 2498 | print_summary(summary); |
ysr@777 | 2499 | } |
ysr@777 | 2500 | if (!printed) { |
ysr@777 | 2501 | print_indent(0); |
ysr@777 | 2502 | gclog_or_tty->print_cr("none"); |
ysr@777 | 2503 | gclog_or_tty->print_cr(""); |
ysr@777 | 2504 | } |
ysr@777 | 2505 | } |
ysr@777 | 2506 | |
ysr@777 | 2507 | void G1CollectorPolicy::print_tracing_info() const { |
ysr@777 | 2508 | if (TraceGen0Time) { |
ysr@777 | 2509 | gclog_or_tty->print_cr("ALL PAUSES"); |
ysr@777 | 2510 | print_summary_sd(0, "Total", _all_pause_times_ms); |
ysr@777 | 2511 | gclog_or_tty->print_cr(""); |
ysr@777 | 2512 | gclog_or_tty->print_cr(""); |
ysr@777 | 2513 | gclog_or_tty->print_cr(" Full Young GC Pauses: %8d", _full_young_pause_num); |
ysr@777 | 2514 | gclog_or_tty->print_cr(" Partial Young GC Pauses: %8d", _partial_young_pause_num); |
ysr@777 | 2515 | gclog_or_tty->print_cr(""); |
ysr@777 | 2516 | |
apetrusenko@1112 | 2517 | gclog_or_tty->print_cr("EVACUATION PAUSES"); |
apetrusenko@1112 | 2518 | print_summary(_summary); |
ysr@777 | 2519 | |
ysr@777 | 2520 | gclog_or_tty->print_cr("ABANDONED PAUSES"); |
apetrusenko@1112 | 2521 | print_abandoned_summary(_abandoned_summary); |
ysr@777 | 2522 | |
ysr@777 | 2523 | gclog_or_tty->print_cr("MISC"); |
ysr@777 | 2524 | print_summary_sd(0, "Stop World", _all_stop_world_times_ms); |
ysr@777 | 2525 | print_summary_sd(0, "Yields", _all_yield_times_ms); |
ysr@777 | 2526 | for (int i = 0; i < _aux_num; ++i) { |
ysr@777 | 2527 | if (_all_aux_times_ms[i].num() > 0) { |
ysr@777 | 2528 | char buffer[96]; |
ysr@777 | 2529 | sprintf(buffer, "Aux%d", i); |
ysr@777 | 2530 | print_summary_sd(0, buffer, &_all_aux_times_ms[i]); |
ysr@777 | 2531 | } |
ysr@777 | 2532 | } |
ysr@777 | 2533 | |
ysr@777 | 2534 | size_t all_region_num = _region_num_young + _region_num_tenured; |
ysr@777 | 2535 | gclog_or_tty->print_cr(" New Regions %8d, Young %8d (%6.2lf%%), " |
ysr@777 | 2536 | "Tenured %8d (%6.2lf%%)", |
ysr@777 | 2537 | all_region_num, |
ysr@777 | 2538 | _region_num_young, |
ysr@777 | 2539 | (double) _region_num_young / (double) all_region_num * 100.0, |
ysr@777 | 2540 | _region_num_tenured, |
ysr@777 | 2541 | (double) _region_num_tenured / (double) all_region_num * 100.0); |
ysr@777 | 2542 | } |
ysr@777 | 2543 | if (TraceGen1Time) { |
ysr@777 | 2544 | if (_all_full_gc_times_ms->num() > 0) { |
ysr@777 | 2545 | gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", |
ysr@777 | 2546 | _all_full_gc_times_ms->num(), |
ysr@777 | 2547 | _all_full_gc_times_ms->sum() / 1000.0); |
ysr@777 | 2548 | gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); |
ysr@777 | 2549 | gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", |
ysr@777 | 2550 | _all_full_gc_times_ms->sd(), |
ysr@777 | 2551 | _all_full_gc_times_ms->maximum()); |
ysr@777 | 2552 | } |
ysr@777 | 2553 | } |
ysr@777 | 2554 | } |
ysr@777 | 2555 | |
ysr@777 | 2556 | void G1CollectorPolicy::print_yg_surv_rate_info() const { |
ysr@777 | 2557 | #ifndef PRODUCT |
ysr@777 | 2558 | _short_lived_surv_rate_group->print_surv_rate_summary(); |
ysr@777 | 2559 | // add this call for any other surv rate groups |
ysr@777 | 2560 | #endif // PRODUCT |
ysr@777 | 2561 | } |
ysr@777 | 2562 | |
ysr@777 | 2563 | bool |
ysr@777 | 2564 | G1CollectorPolicy::should_add_next_region_to_young_list() { |
ysr@777 | 2565 | assert(in_young_gc_mode(), "should be in young GC mode"); |
ysr@777 | 2566 | bool ret; |
ysr@777 | 2567 | size_t young_list_length = _g1->young_list_length(); |
apetrusenko@980 | 2568 | size_t young_list_max_length = _young_list_target_length; |
apetrusenko@980 | 2569 | if (G1FixedEdenSize) { |
apetrusenko@980 | 2570 | young_list_max_length -= _max_survivor_regions; |
apetrusenko@980 | 2571 | } |
apetrusenko@980 | 2572 | if (young_list_length < young_list_max_length) { |
ysr@777 | 2573 | ret = true; |
ysr@777 | 2574 | ++_region_num_young; |
ysr@777 | 2575 | } else { |
ysr@777 | 2576 | ret = false; |
ysr@777 | 2577 | ++_region_num_tenured; |
ysr@777 | 2578 | } |
ysr@777 | 2579 | |
ysr@777 | 2580 | return ret; |
ysr@777 | 2581 | } |
ysr@777 | 2582 | |
ysr@777 | 2583 | #ifndef PRODUCT |
ysr@777 | 2584 | // for debugging, bit of a hack... |
ysr@777 | 2585 | static char* |
ysr@777 | 2586 | region_num_to_mbs(int length) { |
ysr@777 | 2587 | static char buffer[64]; |
ysr@777 | 2588 | double bytes = (double) (length * HeapRegion::GrainBytes); |
ysr@777 | 2589 | double mbs = bytes / (double) (1024 * 1024); |
ysr@777 | 2590 | sprintf(buffer, "%7.2lfMB", mbs); |
ysr@777 | 2591 | return buffer; |
ysr@777 | 2592 | } |
ysr@777 | 2593 | #endif // PRODUCT |
ysr@777 | 2594 | |
apetrusenko@980 | 2595 | size_t G1CollectorPolicy::max_regions(int purpose) { |
ysr@777 | 2596 | switch (purpose) { |
ysr@777 | 2597 | case GCAllocForSurvived: |
apetrusenko@980 | 2598 | return _max_survivor_regions; |
ysr@777 | 2599 | case GCAllocForTenured: |
apetrusenko@980 | 2600 | return REGIONS_UNLIMITED; |
ysr@777 | 2601 | default: |
apetrusenko@980 | 2602 | ShouldNotReachHere(); |
apetrusenko@980 | 2603 | return REGIONS_UNLIMITED; |
ysr@777 | 2604 | }; |
ysr@777 | 2605 | } |
ysr@777 | 2606 | |
apetrusenko@980 | 2607 | // Calculates survivor space parameters. |
apetrusenko@980 | 2608 | void G1CollectorPolicy::calculate_survivors_policy() |
apetrusenko@980 | 2609 | { |
johnc@1186 | 2610 | if (!G1UseSurvivorSpaces) { |
apetrusenko@980 | 2611 | return; |
apetrusenko@980 | 2612 | } |
apetrusenko@980 | 2613 | if (G1FixedSurvivorSpaceSize == 0) { |
apetrusenko@980 | 2614 | _max_survivor_regions = _young_list_target_length / SurvivorRatio; |
apetrusenko@980 | 2615 | } else { |
apetrusenko@982 | 2616 | _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
apetrusenko@980 | 2617 | } |
apetrusenko@980 | 2618 | |
apetrusenko@980 | 2619 | if (G1FixedTenuringThreshold) { |
apetrusenko@980 | 2620 | _tenuring_threshold = MaxTenuringThreshold; |
apetrusenko@980 | 2621 | } else { |
apetrusenko@980 | 2622 | _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( |
apetrusenko@980 | 2623 | HeapRegion::GrainWords * _max_survivor_regions); |
apetrusenko@980 | 2624 | } |
apetrusenko@980 | 2625 | } |
apetrusenko@980 | 2626 | |
ysr@777 | 2627 | bool |
ysr@777 | 2628 | G1CollectorPolicy_BestRegionsFirst::should_do_collection_pause(size_t |
ysr@777 | 2629 | word_size) { |
ysr@777 | 2630 | assert(_g1->regions_accounted_for(), "Region leakage!"); |
ysr@777 | 2631 | // Initiate a pause when we reach the steady-state "used" target. |
ysr@777 | 2632 | size_t used_hard = (_g1->capacity() / 100) * G1SteadyStateUsed; |
ysr@777 | 2633 | size_t used_soft = |
ysr@777 | 2634 | MAX2((_g1->capacity() / 100) * (G1SteadyStateUsed - G1SteadyStateUsedDelta), |
ysr@777 | 2635 | used_hard/2); |
ysr@777 | 2636 | size_t used = _g1->used(); |
ysr@777 | 2637 | |
ysr@777 | 2638 | double max_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
ysr@777 | 2639 | |
ysr@777 | 2640 | size_t young_list_length = _g1->young_list_length(); |
apetrusenko@980 | 2641 | size_t young_list_max_length = _young_list_target_length; |
apetrusenko@980 | 2642 | if (G1FixedEdenSize) { |
apetrusenko@980 | 2643 | young_list_max_length -= _max_survivor_regions; |
apetrusenko@980 | 2644 | } |
apetrusenko@980 | 2645 | bool reached_target_length = young_list_length >= young_list_max_length; |
ysr@777 | 2646 | |
ysr@777 | 2647 | if (in_young_gc_mode()) { |
ysr@777 | 2648 | if (reached_target_length) { |
ysr@777 | 2649 | assert( young_list_length > 0 && _g1->young_list_length() > 0, |
ysr@777 | 2650 | "invariant" ); |
ysr@777 | 2651 | _target_pause_time_ms = max_pause_time_ms; |
ysr@777 | 2652 | return true; |
ysr@777 | 2653 | } |
ysr@777 | 2654 | } else { |
ysr@777 | 2655 | guarantee( false, "should not reach here" ); |
ysr@777 | 2656 | } |
ysr@777 | 2657 | |
ysr@777 | 2658 | return false; |
ysr@777 | 2659 | } |
ysr@777 | 2660 | |
ysr@777 | 2661 | #ifndef PRODUCT |
ysr@777 | 2662 | class HRSortIndexIsOKClosure: public HeapRegionClosure { |
ysr@777 | 2663 | CollectionSetChooser* _chooser; |
ysr@777 | 2664 | public: |
ysr@777 | 2665 | HRSortIndexIsOKClosure(CollectionSetChooser* chooser) : |
ysr@777 | 2666 | _chooser(chooser) {} |
ysr@777 | 2667 | |
ysr@777 | 2668 | bool doHeapRegion(HeapRegion* r) { |
ysr@777 | 2669 | if (!r->continuesHumongous()) { |
ysr@777 | 2670 | assert(_chooser->regionProperlyOrdered(r), "Ought to be."); |
ysr@777 | 2671 | } |
ysr@777 | 2672 | return false; |
ysr@777 | 2673 | } |
ysr@777 | 2674 | }; |
ysr@777 | 2675 | |
ysr@777 | 2676 | bool G1CollectorPolicy_BestRegionsFirst::assertMarkedBytesDataOK() { |
ysr@777 | 2677 | HRSortIndexIsOKClosure cl(_collectionSetChooser); |
ysr@777 | 2678 | _g1->heap_region_iterate(&cl); |
ysr@777 | 2679 | return true; |
ysr@777 | 2680 | } |
ysr@777 | 2681 | #endif |
ysr@777 | 2682 | |
ysr@777 | 2683 | void |
ysr@777 | 2684 | G1CollectorPolicy_BestRegionsFirst:: |
ysr@777 | 2685 | record_collection_pause_start(double start_time_sec, size_t start_used) { |
ysr@777 | 2686 | G1CollectorPolicy::record_collection_pause_start(start_time_sec, start_used); |
ysr@777 | 2687 | } |
ysr@777 | 2688 | |
ysr@777 | 2689 | class NextNonCSElemFinder: public HeapRegionClosure { |
ysr@777 | 2690 | HeapRegion* _res; |
ysr@777 | 2691 | public: |
ysr@777 | 2692 | NextNonCSElemFinder(): _res(NULL) {} |
ysr@777 | 2693 | bool doHeapRegion(HeapRegion* r) { |
ysr@777 | 2694 | if (!r->in_collection_set()) { |
ysr@777 | 2695 | _res = r; |
ysr@777 | 2696 | return true; |
ysr@777 | 2697 | } else { |
ysr@777 | 2698 | return false; |
ysr@777 | 2699 | } |
ysr@777 | 2700 | } |
ysr@777 | 2701 | HeapRegion* res() { return _res; } |
ysr@777 | 2702 | }; |
ysr@777 | 2703 | |
ysr@777 | 2704 | class KnownGarbageClosure: public HeapRegionClosure { |
ysr@777 | 2705 | CollectionSetChooser* _hrSorted; |
ysr@777 | 2706 | |
ysr@777 | 2707 | public: |
ysr@777 | 2708 | KnownGarbageClosure(CollectionSetChooser* hrSorted) : |
ysr@777 | 2709 | _hrSorted(hrSorted) |
ysr@777 | 2710 | {} |
ysr@777 | 2711 | |
ysr@777 | 2712 | bool doHeapRegion(HeapRegion* r) { |
ysr@777 | 2713 | // We only include humongous regions in collection |
ysr@777 | 2714 | // sets when concurrent mark shows that their contained object is |
ysr@777 | 2715 | // unreachable. |
ysr@777 | 2716 | |
ysr@777 | 2717 | // Do we have any marking information for this region? |
ysr@777 | 2718 | if (r->is_marked()) { |
ysr@777 | 2719 | // We don't include humongous regions in collection |
ysr@777 | 2720 | // sets because we collect them immediately at the end of a marking |
ysr@777 | 2721 | // cycle. We also don't include young regions because we *must* |
ysr@777 | 2722 | // include them in the next collection pause. |
ysr@777 | 2723 | if (!r->isHumongous() && !r->is_young()) { |
ysr@777 | 2724 | _hrSorted->addMarkedHeapRegion(r); |
ysr@777 | 2725 | } |
ysr@777 | 2726 | } |
ysr@777 | 2727 | return false; |
ysr@777 | 2728 | } |
ysr@777 | 2729 | }; |
ysr@777 | 2730 | |
ysr@777 | 2731 | class ParKnownGarbageHRClosure: public HeapRegionClosure { |
ysr@777 | 2732 | CollectionSetChooser* _hrSorted; |
ysr@777 | 2733 | jint _marked_regions_added; |
ysr@777 | 2734 | jint _chunk_size; |
ysr@777 | 2735 | jint _cur_chunk_idx; |
ysr@777 | 2736 | jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) |
ysr@777 | 2737 | int _worker; |
ysr@777 | 2738 | int _invokes; |
ysr@777 | 2739 | |
ysr@777 | 2740 | void get_new_chunk() { |
ysr@777 | 2741 | _cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size); |
ysr@777 | 2742 | _cur_chunk_end = _cur_chunk_idx + _chunk_size; |
ysr@777 | 2743 | } |
ysr@777 | 2744 | void add_region(HeapRegion* r) { |
ysr@777 | 2745 | if (_cur_chunk_idx == _cur_chunk_end) { |
ysr@777 | 2746 | get_new_chunk(); |
ysr@777 | 2747 | } |
ysr@777 | 2748 | assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); |
ysr@777 | 2749 | _hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r); |
ysr@777 | 2750 | _marked_regions_added++; |
ysr@777 | 2751 | _cur_chunk_idx++; |
ysr@777 | 2752 | } |
ysr@777 | 2753 | |
ysr@777 | 2754 | public: |
ysr@777 | 2755 | ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, |
ysr@777 | 2756 | jint chunk_size, |
ysr@777 | 2757 | int worker) : |
ysr@777 | 2758 | _hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker), |
ysr@777 | 2759 | _marked_regions_added(0), _cur_chunk_idx(0), _cur_chunk_end(0), |
ysr@777 | 2760 | _invokes(0) |
ysr@777 | 2761 | {} |
ysr@777 | 2762 | |
ysr@777 | 2763 | bool doHeapRegion(HeapRegion* r) { |
ysr@777 | 2764 | // We only include humongous regions in collection |
ysr@777 | 2765 | // sets when concurrent mark shows that their contained object is |
ysr@777 | 2766 | // unreachable. |
ysr@777 | 2767 | _invokes++; |
ysr@777 | 2768 | |
ysr@777 | 2769 | // Do we have any marking information for this region? |
ysr@777 | 2770 | if (r->is_marked()) { |
ysr@777 | 2771 | // We don't include humongous regions in collection |
ysr@777 | 2772 | // sets because we collect them immediately at the end of a marking |
ysr@777 | 2773 | // cycle. |
ysr@777 | 2774 | // We also do not include young regions in collection sets |
ysr@777 | 2775 | if (!r->isHumongous() && !r->is_young()) { |
ysr@777 | 2776 | add_region(r); |
ysr@777 | 2777 | } |
ysr@777 | 2778 | } |
ysr@777 | 2779 | return false; |
ysr@777 | 2780 | } |
ysr@777 | 2781 | jint marked_regions_added() { return _marked_regions_added; } |
ysr@777 | 2782 | int invokes() { return _invokes; } |
ysr@777 | 2783 | }; |
ysr@777 | 2784 | |
ysr@777 | 2785 | class ParKnownGarbageTask: public AbstractGangTask { |
ysr@777 | 2786 | CollectionSetChooser* _hrSorted; |
ysr@777 | 2787 | jint _chunk_size; |
ysr@777 | 2788 | G1CollectedHeap* _g1; |
ysr@777 | 2789 | public: |
ysr@777 | 2790 | ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) : |
ysr@777 | 2791 | AbstractGangTask("ParKnownGarbageTask"), |
ysr@777 | 2792 | _hrSorted(hrSorted), _chunk_size(chunk_size), |
ysr@777 | 2793 | _g1(G1CollectedHeap::heap()) |
ysr@777 | 2794 | {} |
ysr@777 | 2795 | |
ysr@777 | 2796 | void work(int i) { |
ysr@777 | 2797 | ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size, i); |
ysr@777 | 2798 | // Back to zero for the claim value. |
tonyp@790 | 2799 | _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, i, |
tonyp@790 | 2800 | HeapRegion::InitialClaimValue); |
ysr@777 | 2801 | jint regions_added = parKnownGarbageCl.marked_regions_added(); |
ysr@777 | 2802 | _hrSorted->incNumMarkedHeapRegions(regions_added); |
ysr@777 | 2803 | if (G1PrintParCleanupStats) { |
ysr@777 | 2804 | gclog_or_tty->print(" Thread %d called %d times, added %d regions to list.\n", |
ysr@777 | 2805 | i, parKnownGarbageCl.invokes(), regions_added); |
ysr@777 | 2806 | } |
ysr@777 | 2807 | } |
ysr@777 | 2808 | }; |
ysr@777 | 2809 | |
ysr@777 | 2810 | void |
ysr@777 | 2811 | G1CollectorPolicy_BestRegionsFirst:: |
ysr@777 | 2812 | record_concurrent_mark_cleanup_end(size_t freed_bytes, |
ysr@777 | 2813 | size_t max_live_bytes) { |
ysr@777 | 2814 | double start; |
ysr@777 | 2815 | if (G1PrintParCleanupStats) start = os::elapsedTime(); |
ysr@777 | 2816 | record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); |
ysr@777 | 2817 | |
ysr@777 | 2818 | _collectionSetChooser->clearMarkedHeapRegions(); |
ysr@777 | 2819 | double clear_marked_end; |
ysr@777 | 2820 | if (G1PrintParCleanupStats) { |
ysr@777 | 2821 | clear_marked_end = os::elapsedTime(); |
ysr@777 | 2822 | gclog_or_tty->print_cr(" clear marked regions + work1: %8.3f ms.", |
ysr@777 | 2823 | (clear_marked_end - start)*1000.0); |
ysr@777 | 2824 | } |
ysr@777 | 2825 | if (ParallelGCThreads > 0) { |
ysr@777 | 2826 | const size_t OverpartitionFactor = 4; |
ysr@777 | 2827 | const size_t MinChunkSize = 8; |
ysr@777 | 2828 | const size_t ChunkSize = |
ysr@777 | 2829 | MAX2(_g1->n_regions() / (ParallelGCThreads * OverpartitionFactor), |
ysr@777 | 2830 | MinChunkSize); |
ysr@777 | 2831 | _collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(), |
ysr@777 | 2832 | ChunkSize); |
ysr@777 | 2833 | ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
ysr@777 | 2834 | (int) ChunkSize); |
ysr@777 | 2835 | _g1->workers()->run_task(&parKnownGarbageTask); |
tonyp@790 | 2836 | |
tonyp@790 | 2837 | assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
tonyp@790 | 2838 | "sanity check"); |
ysr@777 | 2839 | } else { |
ysr@777 | 2840 | KnownGarbageClosure knownGarbagecl(_collectionSetChooser); |
ysr@777 | 2841 | _g1->heap_region_iterate(&knownGarbagecl); |
ysr@777 | 2842 | } |
ysr@777 | 2843 | double known_garbage_end; |
ysr@777 | 2844 | if (G1PrintParCleanupStats) { |
ysr@777 | 2845 | known_garbage_end = os::elapsedTime(); |
ysr@777 | 2846 | gclog_or_tty->print_cr(" compute known garbage: %8.3f ms.", |
ysr@777 | 2847 | (known_garbage_end - clear_marked_end)*1000.0); |
ysr@777 | 2848 | } |
ysr@777 | 2849 | _collectionSetChooser->sortMarkedHeapRegions(); |
ysr@777 | 2850 | double sort_end; |
ysr@777 | 2851 | if (G1PrintParCleanupStats) { |
ysr@777 | 2852 | sort_end = os::elapsedTime(); |
ysr@777 | 2853 | gclog_or_tty->print_cr(" sorting: %8.3f ms.", |
ysr@777 | 2854 | (sort_end - known_garbage_end)*1000.0); |
ysr@777 | 2855 | } |
ysr@777 | 2856 | |
ysr@777 | 2857 | record_concurrent_mark_cleanup_end_work2(); |
ysr@777 | 2858 | double work2_end; |
ysr@777 | 2859 | if (G1PrintParCleanupStats) { |
ysr@777 | 2860 | work2_end = os::elapsedTime(); |
ysr@777 | 2861 | gclog_or_tty->print_cr(" work2: %8.3f ms.", |
ysr@777 | 2862 | (work2_end - sort_end)*1000.0); |
ysr@777 | 2863 | } |
ysr@777 | 2864 | } |
ysr@777 | 2865 | |
ysr@777 | 2866 | // Add the heap region to the collection set and return the conservative |
ysr@777 | 2867 | // estimate of the number of live bytes. |
ysr@777 | 2868 | void G1CollectorPolicy:: |
ysr@777 | 2869 | add_to_collection_set(HeapRegion* hr) { |
johnc@1186 | 2870 | if (G1PrintRegions) { |
ysr@777 | 2871 | gclog_or_tty->print_cr("added region to cset %d:["PTR_FORMAT", "PTR_FORMAT"], " |
ysr@777 | 2872 | "top "PTR_FORMAT", young %s", |
ysr@777 | 2873 | hr->hrs_index(), hr->bottom(), hr->end(), |
ysr@777 | 2874 | hr->top(), (hr->is_young()) ? "YES" : "NO"); |
ysr@777 | 2875 | } |
ysr@777 | 2876 | |
ysr@777 | 2877 | if (_g1->mark_in_progress()) |
ysr@777 | 2878 | _g1->concurrent_mark()->registerCSetRegion(hr); |
ysr@777 | 2879 | |
ysr@777 | 2880 | assert(!hr->in_collection_set(), |
ysr@777 | 2881 | "should not already be in the CSet"); |
ysr@777 | 2882 | hr->set_in_collection_set(true); |
ysr@777 | 2883 | hr->set_next_in_collection_set(_collection_set); |
ysr@777 | 2884 | _collection_set = hr; |
ysr@777 | 2885 | _collection_set_size++; |
ysr@777 | 2886 | _collection_set_bytes_used_before += hr->used(); |
tonyp@961 | 2887 | _g1->register_region_with_in_cset_fast_test(hr); |
ysr@777 | 2888 | } |
ysr@777 | 2889 | |
ysr@777 | 2890 | void |
ysr@777 | 2891 | G1CollectorPolicy_BestRegionsFirst:: |
apetrusenko@1112 | 2892 | choose_collection_set() { |
ysr@777 | 2893 | double non_young_start_time_sec; |
ysr@777 | 2894 | start_recording_regions(); |
ysr@777 | 2895 | |
ysr@1523 | 2896 | guarantee(_target_pause_time_ms > -1.0 |
ysr@1523 | 2897 | NOT_PRODUCT(|| Universe::heap()->gc_cause() == GCCause::_scavenge_alot), |
apetrusenko@1112 | 2898 | "_target_pause_time_ms should have been set!"); |
ysr@1523 | 2899 | #ifndef PRODUCT |
ysr@1523 | 2900 | if (_target_pause_time_ms <= -1.0) { |
ysr@1523 | 2901 | assert(ScavengeALot && Universe::heap()->gc_cause() == GCCause::_scavenge_alot, "Error"); |
ysr@1523 | 2902 | _target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
ysr@1523 | 2903 | } |
ysr@1523 | 2904 | #endif |
apetrusenko@1112 | 2905 | assert(_collection_set == NULL, "Precondition"); |
ysr@777 | 2906 | |
ysr@777 | 2907 | double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); |
ysr@777 | 2908 | double predicted_pause_time_ms = base_time_ms; |
ysr@777 | 2909 | |
ysr@777 | 2910 | double target_time_ms = _target_pause_time_ms; |
ysr@777 | 2911 | double time_remaining_ms = target_time_ms - base_time_ms; |
ysr@777 | 2912 | |
ysr@777 | 2913 | // the 10% and 50% values are arbitrary... |
ysr@777 | 2914 | if (time_remaining_ms < 0.10*target_time_ms) { |
ysr@777 | 2915 | time_remaining_ms = 0.50 * target_time_ms; |
ysr@777 | 2916 | _within_target = false; |
ysr@777 | 2917 | } else { |
ysr@777 | 2918 | _within_target = true; |
ysr@777 | 2919 | } |
ysr@777 | 2920 | |
ysr@777 | 2921 | // We figure out the number of bytes available for future to-space. |
ysr@777 | 2922 | // For new regions without marking information, we must assume the |
ysr@777 | 2923 | // worst-case of complete survival. If we have marking information for a |
ysr@777 | 2924 | // region, we can bound the amount of live data. We can add a number of |
ysr@777 | 2925 | // such regions, as long as the sum of the live data bounds does not |
ysr@777 | 2926 | // exceed the available evacuation space. |
ysr@777 | 2927 | size_t max_live_bytes = _g1->free_regions() * HeapRegion::GrainBytes; |
ysr@777 | 2928 | |
ysr@777 | 2929 | size_t expansion_bytes = |
ysr@777 | 2930 | _g1->expansion_regions() * HeapRegion::GrainBytes; |
ysr@777 | 2931 | |
apetrusenko@1112 | 2932 | _collection_set_bytes_used_before = 0; |
apetrusenko@1112 | 2933 | _collection_set_size = 0; |
ysr@777 | 2934 | |
ysr@777 | 2935 | // Adjust for expansion and slop. |
ysr@777 | 2936 | max_live_bytes = max_live_bytes + expansion_bytes; |
ysr@777 | 2937 | |
apetrusenko@1112 | 2938 | assert(_g1->regions_accounted_for(), "Region leakage!"); |
ysr@777 | 2939 | |
ysr@777 | 2940 | HeapRegion* hr; |
ysr@777 | 2941 | if (in_young_gc_mode()) { |
ysr@777 | 2942 | double young_start_time_sec = os::elapsedTime(); |
ysr@777 | 2943 | |
ysr@777 | 2944 | if (G1PolicyVerbose > 0) { |
ysr@777 | 2945 | gclog_or_tty->print_cr("Adding %d young regions to the CSet", |
ysr@777 | 2946 | _g1->young_list_length()); |
ysr@777 | 2947 | } |
ysr@777 | 2948 | _young_cset_length = 0; |
ysr@777 | 2949 | _last_young_gc_full = full_young_gcs() ? true : false; |
ysr@777 | 2950 | if (_last_young_gc_full) |
ysr@777 | 2951 | ++_full_young_pause_num; |
ysr@777 | 2952 | else |
ysr@777 | 2953 | ++_partial_young_pause_num; |
ysr@777 | 2954 | hr = _g1->pop_region_from_young_list(); |
ysr@777 | 2955 | while (hr != NULL) { |
ysr@777 | 2956 | |
ysr@777 | 2957 | assert( hr->young_index_in_cset() == -1, "invariant" ); |
ysr@777 | 2958 | assert( hr->age_in_surv_rate_group() != -1, "invariant" ); |
ysr@777 | 2959 | hr->set_young_index_in_cset((int) _young_cset_length); |
ysr@777 | 2960 | |
ysr@777 | 2961 | ++_young_cset_length; |
ysr@777 | 2962 | double predicted_time_ms = predict_region_elapsed_time_ms(hr, true); |
ysr@777 | 2963 | time_remaining_ms -= predicted_time_ms; |
ysr@777 | 2964 | predicted_pause_time_ms += predicted_time_ms; |
apetrusenko@1112 | 2965 | assert(!hr->in_collection_set(), "invariant"); |
apetrusenko@1112 | 2966 | add_to_collection_set(hr); |
apetrusenko@1112 | 2967 | record_cset_region(hr, true); |
ysr@777 | 2968 | max_live_bytes -= MIN2(hr->max_live_bytes(), max_live_bytes); |
ysr@777 | 2969 | if (G1PolicyVerbose > 0) { |
ysr@777 | 2970 | gclog_or_tty->print_cr(" Added [" PTR_FORMAT ", " PTR_FORMAT") to CS.", |
ysr@777 | 2971 | hr->bottom(), hr->end()); |
ysr@777 | 2972 | gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", |
ysr@777 | 2973 | max_live_bytes/K); |
ysr@777 | 2974 | } |
ysr@777 | 2975 | hr = _g1->pop_region_from_young_list(); |
ysr@777 | 2976 | } |
ysr@777 | 2977 | |
ysr@777 | 2978 | record_scan_only_regions(_g1->young_list_scan_only_length()); |
ysr@777 | 2979 | |
ysr@777 | 2980 | double young_end_time_sec = os::elapsedTime(); |
ysr@777 | 2981 | _recorded_young_cset_choice_time_ms = |
ysr@777 | 2982 | (young_end_time_sec - young_start_time_sec) * 1000.0; |
ysr@777 | 2983 | |
ysr@777 | 2984 | non_young_start_time_sec = os::elapsedTime(); |
ysr@777 | 2985 | |
ysr@777 | 2986 | if (_young_cset_length > 0 && _last_young_gc_full) { |
ysr@777 | 2987 | // don't bother adding more regions... |
ysr@777 | 2988 | goto choose_collection_set_end; |
ysr@777 | 2989 | } |
ysr@777 | 2990 | } |
ysr@777 | 2991 | |
ysr@777 | 2992 | if (!in_young_gc_mode() || !full_young_gcs()) { |
ysr@777 | 2993 | bool should_continue = true; |
ysr@777 | 2994 | NumberSeq seq; |
ysr@777 | 2995 | double avg_prediction = 100000000000000000.0; // something very large |
ysr@777 | 2996 | do { |
ysr@777 | 2997 | hr = _collectionSetChooser->getNextMarkedRegion(time_remaining_ms, |
ysr@777 | 2998 | avg_prediction); |
apetrusenko@1112 | 2999 | if (hr != NULL) { |
ysr@777 | 3000 | double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
ysr@777 | 3001 | time_remaining_ms -= predicted_time_ms; |
ysr@777 | 3002 | predicted_pause_time_ms += predicted_time_ms; |
ysr@777 | 3003 | add_to_collection_set(hr); |
ysr@777 | 3004 | record_cset_region(hr, false); |
ysr@777 | 3005 | max_live_bytes -= MIN2(hr->max_live_bytes(), max_live_bytes); |
ysr@777 | 3006 | if (G1PolicyVerbose > 0) { |
ysr@777 | 3007 | gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", |
ysr@777 | 3008 | max_live_bytes/K); |
ysr@777 | 3009 | } |
ysr@777 | 3010 | seq.add(predicted_time_ms); |
ysr@777 | 3011 | avg_prediction = seq.avg() + seq.sd(); |
ysr@777 | 3012 | } |
ysr@777 | 3013 | should_continue = |
ysr@777 | 3014 | ( hr != NULL) && |
ysr@777 | 3015 | ( (adaptive_young_list_length()) ? time_remaining_ms > 0.0 |
ysr@777 | 3016 | : _collection_set_size < _young_list_fixed_length ); |
ysr@777 | 3017 | } while (should_continue); |
ysr@777 | 3018 | |
ysr@777 | 3019 | if (!adaptive_young_list_length() && |
ysr@777 | 3020 | _collection_set_size < _young_list_fixed_length) |
ysr@777 | 3021 | _should_revert_to_full_young_gcs = true; |
ysr@777 | 3022 | } |
ysr@777 | 3023 | |
ysr@777 | 3024 | choose_collection_set_end: |
ysr@777 | 3025 | count_CS_bytes_used(); |
ysr@777 | 3026 | |
ysr@777 | 3027 | end_recording_regions(); |
ysr@777 | 3028 | |
ysr@777 | 3029 | double non_young_end_time_sec = os::elapsedTime(); |
ysr@777 | 3030 | _recorded_non_young_cset_choice_time_ms = |
ysr@777 | 3031 | (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; |
ysr@777 | 3032 | } |
ysr@777 | 3033 | |
ysr@777 | 3034 | void G1CollectorPolicy_BestRegionsFirst::record_full_collection_end() { |
ysr@777 | 3035 | G1CollectorPolicy::record_full_collection_end(); |
ysr@777 | 3036 | _collectionSetChooser->updateAfterFullCollection(); |
ysr@777 | 3037 | } |
ysr@777 | 3038 | |
ysr@777 | 3039 | void G1CollectorPolicy_BestRegionsFirst:: |
ysr@777 | 3040 | expand_if_possible(size_t numRegions) { |
ysr@777 | 3041 | size_t expansion_bytes = numRegions * HeapRegion::GrainBytes; |
ysr@777 | 3042 | _g1->expand(expansion_bytes); |
ysr@777 | 3043 | } |
ysr@777 | 3044 | |
ysr@777 | 3045 | void G1CollectorPolicy_BestRegionsFirst:: |
apetrusenko@1112 | 3046 | record_collection_pause_end(bool abandoned) { |
apetrusenko@1112 | 3047 | G1CollectorPolicy::record_collection_pause_end(abandoned); |
ysr@777 | 3048 | assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end."); |
ysr@777 | 3049 | } |