Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 845:df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
Summary: Modifications to G1 so as to allow the use of compressed oops.
Reviewed-by: apetrusenko, coleenp, jmasa, kvn, never, phh, tonyp
| author | ysr |
|---|---|
| date | Tue, 14 Jul 2009 15:40:39 -0700 |
| parents | 315a5d70b295 |
| children | 6cb8e9df7174 |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 579 | 2 * Copyright 2001-2009 Sun Microsystems, Inc. All Rights Reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #include "incls/_precompiled.incl" | |
| 26 #include "incls/_g1CollectorPolicy.cpp.incl" | |
| 27 | |
| 28 #define PREDICTIONS_VERBOSE 0 | |
| 29 | |
| 30 // <NEW PREDICTION> | |
| 31 | |
| 32 // Different defaults for different number of GC threads | |
| 33 // They were chosen by running GCOld and SPECjbb on debris with different | |
| 34 // numbers of GC threads and choosing them based on the results | |
| 35 | |
| 36 // all the same | |
| 37 static double rs_length_diff_defaults[] = { | |
| 38 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 | |
| 39 }; | |
| 40 | |
| 41 static double cost_per_card_ms_defaults[] = { | |
| 42 0.01, 0.005, 0.005, 0.003, 0.003, 0.002, 0.002, 0.0015 | |
| 43 }; | |
| 44 | |
| 45 static double cost_per_scan_only_region_ms_defaults[] = { | |
| 46 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 | |
| 47 }; | |
| 48 | |
| 49 // all the same | |
| 50 static double fully_young_cards_per_entry_ratio_defaults[] = { | |
| 51 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 | |
| 52 }; | |
| 53 | |
| 54 static double cost_per_entry_ms_defaults[] = { | |
| 55 0.015, 0.01, 0.01, 0.008, 0.008, 0.0055, 0.0055, 0.005 | |
| 56 }; | |
| 57 | |
| 58 static double cost_per_byte_ms_defaults[] = { | |
| 59 0.00006, 0.00003, 0.00003, 0.000015, 0.000015, 0.00001, 0.00001, 0.000009 | |
| 60 }; | |
| 61 | |
| 62 // these should be pretty consistent | |
| 63 static double constant_other_time_ms_defaults[] = { | |
| 64 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0 | |
| 65 }; | |
| 66 | |
| 67 | |
| 68 static double young_other_cost_per_region_ms_defaults[] = { | |
| 69 0.3, 0.2, 0.2, 0.15, 0.15, 0.12, 0.12, 0.1 | |
| 70 }; | |
| 71 | |
| 72 static double non_young_other_cost_per_region_ms_defaults[] = { | |
| 73 1.0, 0.7, 0.7, 0.5, 0.5, 0.42, 0.42, 0.30 | |
| 74 }; | |
| 75 | |
| 76 // </NEW PREDICTION> | |
| 77 | |
| 78 G1CollectorPolicy::G1CollectorPolicy() : | |
| 79 _parallel_gc_threads((ParallelGCThreads > 0) ? ParallelGCThreads : 1), | |
| 80 _n_pauses(0), | |
| 81 _recent_CH_strong_roots_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 82 _recent_G1_strong_roots_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 83 _recent_evac_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 84 _recent_pause_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 85 _recent_rs_sizes(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 86 _recent_gc_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 87 _all_pause_times_ms(new NumberSeq()), | |
| 88 _stop_world_start(0.0), | |
| 89 _all_stop_world_times_ms(new NumberSeq()), | |
| 90 _all_yield_times_ms(new NumberSeq()), | |
| 91 | |
| 92 _all_mod_union_times_ms(new NumberSeq()), | |
| 93 | |
| 677 | 94 _summary(new Summary()), |
| 95 _abandoned_summary(new AbandonedSummary()), | |
| 342 | 96 |
| 97 _cur_clear_ct_time_ms(0.0), | |
| 98 | |
| 99 _region_num_young(0), | |
| 100 _region_num_tenured(0), | |
| 101 _prev_region_num_young(0), | |
| 102 _prev_region_num_tenured(0), | |
| 103 | |
| 104 _aux_num(10), | |
| 105 _all_aux_times_ms(new NumberSeq[_aux_num]), | |
| 106 _cur_aux_start_times_ms(new double[_aux_num]), | |
| 107 _cur_aux_times_ms(new double[_aux_num]), | |
| 108 _cur_aux_times_set(new bool[_aux_num]), | |
| 109 | |
| 110 _concurrent_mark_init_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 111 _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 112 _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 113 | |
| 114 // <NEW PREDICTION> | |
| 115 | |
| 116 _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 117 _prev_collection_pause_end_ms(0.0), | |
| 118 _pending_card_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 119 _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 120 _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 121 _cost_per_scan_only_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 122 _fully_young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 123 _partially_young_cards_per_entry_ratio_seq( | |
| 124 new TruncatedSeq(TruncatedSeqLength)), | |
| 125 _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 126 _partially_young_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 127 _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 128 _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 129 _cost_per_scan_only_region_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 130 _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 131 _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 132 _non_young_other_cost_per_region_ms_seq( | |
| 133 new TruncatedSeq(TruncatedSeqLength)), | |
| 134 | |
| 135 _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 136 _scanned_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 137 _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 138 | |
| 751 | 139 _pause_time_target_ms((double) MaxGCPauseMillis), |
| 342 | 140 |
| 141 // </NEW PREDICTION> | |
| 142 | |
| 143 _in_young_gc_mode(false), | |
| 144 _full_young_gcs(true), | |
| 145 _full_young_pause_num(0), | |
| 146 _partial_young_pause_num(0), | |
| 147 | |
| 148 _during_marking(false), | |
| 149 _in_marking_window(false), | |
| 150 _in_marking_window_im(false), | |
| 151 | |
| 152 _known_garbage_ratio(0.0), | |
| 153 _known_garbage_bytes(0), | |
| 154 | |
| 155 _young_gc_eff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 156 _target_pause_time_ms(-1.0), | |
| 157 | |
| 158 _recent_prev_end_times_for_all_gcs_sec(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 159 | |
| 160 _recent_CS_bytes_used_before(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 161 _recent_CS_bytes_surviving(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 162 | |
| 163 _recent_avg_pause_time_ratio(0.0), | |
| 164 _num_markings(0), | |
| 165 _n_marks(0), | |
| 166 _n_pauses_at_mark_end(0), | |
| 167 | |
| 168 _all_full_gc_times_ms(new NumberSeq()), | |
| 169 | |
| 170 // G1PausesBtwnConcMark defaults to -1 | |
| 171 // so the hack is to do the cast QQQ FIXME | |
| 172 _pauses_btwn_concurrent_mark((size_t)G1PausesBtwnConcMark), | |
| 173 _n_marks_since_last_pause(0), | |
| 174 _conc_mark_initiated(false), | |
| 175 _should_initiate_conc_mark(false), | |
| 176 _should_revert_to_full_young_gcs(false), | |
| 177 _last_full_young_gc(false), | |
| 178 | |
| 179 _prev_collection_pause_used_at_end_bytes(0), | |
| 180 | |
| 181 _collection_set(NULL), | |
| 182 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 183 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 184 #endif // _MSC_VER | |
| 185 | |
| 186 _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", | |
| 187 G1YoungSurvRateNumRegionsSummary)), | |
| 188 _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", | |
| 545 | 189 G1YoungSurvRateNumRegionsSummary)), |
| 342 | 190 // add here any more surv rate groups |
| 545 | 191 _recorded_survivor_regions(0), |
| 192 _recorded_survivor_head(NULL), | |
| 193 _recorded_survivor_tail(NULL), | |
| 194 _survivors_age_table(true) | |
| 195 | |
| 342 | 196 { |
| 197 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); | |
| 198 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
| 199 | |
| 200 _par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads]; | |
| 201 _par_last_mark_stack_scan_times_ms = new double[_parallel_gc_threads]; | |
| 202 _par_last_scan_only_times_ms = new double[_parallel_gc_threads]; | |
| 203 _par_last_scan_only_regions_scanned = new double[_parallel_gc_threads]; | |
| 204 | |
| 205 _par_last_update_rs_start_times_ms = new double[_parallel_gc_threads]; | |
| 206 _par_last_update_rs_times_ms = new double[_parallel_gc_threads]; | |
| 207 _par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; | |
| 208 | |
| 209 _par_last_scan_rs_start_times_ms = new double[_parallel_gc_threads]; | |
| 210 _par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; | |
| 211 _par_last_scan_new_refs_times_ms = new double[_parallel_gc_threads]; | |
| 212 | |
| 213 _par_last_obj_copy_times_ms = new double[_parallel_gc_threads]; | |
| 214 | |
| 215 _par_last_termination_times_ms = new double[_parallel_gc_threads]; | |
| 216 | |
| 217 // start conservatively | |
| 751 | 218 _expensive_region_limit_ms = 0.5 * (double) MaxGCPauseMillis; |
| 342 | 219 |
| 220 // <NEW PREDICTION> | |
| 221 | |
| 222 int index; | |
| 223 if (ParallelGCThreads == 0) | |
| 224 index = 0; | |
| 225 else if (ParallelGCThreads > 8) | |
| 226 index = 7; | |
| 227 else | |
| 228 index = ParallelGCThreads - 1; | |
| 229 | |
| 230 _pending_card_diff_seq->add(0.0); | |
| 231 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
| 232 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
| 233 _cost_per_scan_only_region_ms_seq->add( | |
| 234 cost_per_scan_only_region_ms_defaults[index]); | |
| 235 _fully_young_cards_per_entry_ratio_seq->add( | |
| 236 fully_young_cards_per_entry_ratio_defaults[index]); | |
| 237 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); | |
| 238 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
| 239 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
| 240 _young_other_cost_per_region_ms_seq->add( | |
| 241 young_other_cost_per_region_ms_defaults[index]); | |
| 242 _non_young_other_cost_per_region_ms_seq->add( | |
| 243 non_young_other_cost_per_region_ms_defaults[index]); | |
| 244 | |
| 245 // </NEW PREDICTION> | |
| 246 | |
| 751 | 247 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
| 248 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; | |
| 342 | 249 guarantee(max_gc_time < time_slice, |
| 250 "Max GC time should not be greater than the time slice"); | |
| 251 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); | |
| 751 | 252 _sigma = (double) G1ConfidencePercent / 100.0; |
| 342 | 253 |
| 254 // start conservatively (around 50ms is about right) | |
| 255 _concurrent_mark_init_times_ms->add(0.05); | |
| 256 _concurrent_mark_remark_times_ms->add(0.05); | |
| 257 _concurrent_mark_cleanup_times_ms->add(0.20); | |
| 258 _tenuring_threshold = MaxTenuringThreshold; | |
| 259 | |
| 751 | 260 if (G1UseSurvivorSpaces) { |
| 545 | 261 // if G1FixedSurvivorSpaceSize is 0 which means the size is not |
| 262 // fixed, then _max_survivor_regions will be calculated at | |
|
547
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263 // calculate_young_list_target_config during initialization |
| 545 | 264 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
| 265 } else { | |
| 266 _max_survivor_regions = 0; | |
| 267 } | |
| 268 | |
| 342 | 269 initialize_all(); |
| 270 } | |
| 271 | |
| 272 // Increment "i", mod "len" | |
| 273 static void inc_mod(int& i, int len) { | |
| 274 i++; if (i == len) i = 0; | |
| 275 } | |
| 276 | |
| 277 void G1CollectorPolicy::initialize_flags() { | |
| 278 set_min_alignment(HeapRegion::GrainBytes); | |
| 279 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
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280 if (SurvivorRatio < 1) { |
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281 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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282 } |
| 342 | 283 CollectorPolicy::initialize_flags(); |
| 284 } | |
| 285 | |
| 286 void G1CollectorPolicy::init() { | |
| 287 // Set aside an initial future to_space. | |
| 288 _g1 = G1CollectedHeap::heap(); | |
| 289 size_t regions = Universe::heap()->capacity() / HeapRegion::GrainBytes; | |
| 290 | |
| 291 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
| 292 | |
| 293 if (G1SteadyStateUsed < 50) { | |
| 294 vm_exit_during_initialization("G1SteadyStateUsed must be at least 50%."); | |
| 295 } | |
| 296 | |
| 545 | 297 initialize_gc_policy_counters(); |
| 298 | |
| 342 | 299 if (G1Gen) { |
| 300 _in_young_gc_mode = true; | |
| 301 | |
| 302 if (G1YoungGenSize == 0) { | |
| 303 set_adaptive_young_list_length(true); | |
| 304 _young_list_fixed_length = 0; | |
| 305 } else { | |
| 306 set_adaptive_young_list_length(false); | |
| 307 _young_list_fixed_length = (G1YoungGenSize / HeapRegion::GrainBytes); | |
| 308 } | |
| 309 _free_regions_at_end_of_collection = _g1->free_regions(); | |
| 310 _scan_only_regions_at_end_of_collection = 0; | |
| 311 calculate_young_list_min_length(); | |
| 312 guarantee( _young_list_min_length == 0, "invariant, not enough info" ); | |
| 313 calculate_young_list_target_config(); | |
| 314 } else { | |
| 315 _young_list_fixed_length = 0; | |
| 316 _in_young_gc_mode = false; | |
| 317 } | |
| 318 } | |
| 319 | |
| 545 | 320 // Create the jstat counters for the policy. |
| 321 void G1CollectorPolicy::initialize_gc_policy_counters() | |
| 322 { | |
| 323 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 2 + G1Gen); | |
| 324 } | |
| 325 | |
| 342 | 326 void G1CollectorPolicy::calculate_young_list_min_length() { |
| 327 _young_list_min_length = 0; | |
| 328 | |
| 329 if (!adaptive_young_list_length()) | |
| 330 return; | |
| 331 | |
| 332 if (_alloc_rate_ms_seq->num() > 3) { | |
| 333 double now_sec = os::elapsedTime(); | |
| 334 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; | |
| 335 double alloc_rate_ms = predict_alloc_rate_ms(); | |
| 336 int min_regions = (int) ceil(alloc_rate_ms * when_ms); | |
| 337 int current_region_num = (int) _g1->young_list_length(); | |
| 338 _young_list_min_length = min_regions + current_region_num; | |
| 339 } | |
| 340 } | |
| 341 | |
| 342 void G1CollectorPolicy::calculate_young_list_target_config() { | |
| 343 if (adaptive_young_list_length()) { | |
| 344 size_t rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); | |
| 345 calculate_young_list_target_config(rs_lengths); | |
| 346 } else { | |
| 347 if (full_young_gcs()) | |
| 348 _young_list_target_length = _young_list_fixed_length; | |
| 349 else | |
| 350 _young_list_target_length = _young_list_fixed_length / 2; | |
| 351 _young_list_target_length = MAX2(_young_list_target_length, (size_t)1); | |
| 352 size_t so_length = calculate_optimal_so_length(_young_list_target_length); | |
| 353 guarantee( so_length < _young_list_target_length, "invariant" ); | |
| 354 _young_list_so_prefix_length = so_length; | |
| 355 } | |
| 545 | 356 calculate_survivors_policy(); |
| 342 | 357 } |
| 358 | |
| 359 // This method calculate the optimal scan-only set for a fixed young | |
| 360 // gen size. I couldn't work out how to reuse the more elaborate one, | |
| 361 // i.e. calculate_young_list_target_config(rs_length), as the loops are | |
| 362 // fundamentally different (the other one finds a config for different | |
| 363 // S-O lengths, whereas here we need to do the opposite). | |
| 364 size_t G1CollectorPolicy::calculate_optimal_so_length( | |
| 365 size_t young_list_length) { | |
| 366 if (!G1UseScanOnlyPrefix) | |
| 367 return 0; | |
| 368 | |
| 369 if (_all_pause_times_ms->num() < 3) { | |
| 370 // we won't use a scan-only set at the beginning to allow the rest | |
| 371 // of the predictors to warm up | |
| 372 return 0; | |
| 373 } | |
| 374 | |
| 375 if (_cost_per_scan_only_region_ms_seq->num() < 3) { | |
| 376 // then, we'll only set the S-O set to 1 for a little bit of time, | |
| 377 // to get enough information on the scanning cost | |
| 378 return 1; | |
| 379 } | |
| 380 | |
| 381 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); | |
| 382 size_t rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); | |
| 383 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); | |
| 384 size_t scanned_cards; | |
| 385 if (full_young_gcs()) | |
| 386 scanned_cards = predict_young_card_num(adj_rs_lengths); | |
| 387 else | |
| 388 scanned_cards = predict_non_young_card_num(adj_rs_lengths); | |
| 389 double base_time_ms = predict_base_elapsed_time_ms(pending_cards, | |
| 390 scanned_cards); | |
| 391 | |
| 392 size_t so_length = 0; | |
| 393 double max_gc_eff = 0.0; | |
| 394 for (size_t i = 0; i < young_list_length; ++i) { | |
| 395 double gc_eff = 0.0; | |
| 396 double pause_time_ms = 0.0; | |
| 397 predict_gc_eff(young_list_length, i, base_time_ms, | |
| 398 &gc_eff, &pause_time_ms); | |
| 399 if (gc_eff > max_gc_eff) { | |
| 400 max_gc_eff = gc_eff; | |
| 401 so_length = i; | |
| 402 } | |
| 403 } | |
| 404 | |
| 405 // set it to 95% of the optimal to make sure we sample the "area" | |
| 406 // around the optimal length to get up-to-date survival rate data | |
| 407 return so_length * 950 / 1000; | |
| 408 } | |
| 409 | |
| 410 // This is a really cool piece of code! It finds the best | |
| 411 // target configuration (young length / scan-only prefix length) so | |
| 412 // that GC efficiency is maximized and that we also meet a pause | |
| 413 // time. It's a triple nested loop. These loops are explained below | |
| 414 // from the inside-out :-) | |
| 415 // | |
| 416 // (a) The innermost loop will try to find the optimal young length | |
| 417 // for a fixed S-O length. It uses a binary search to speed up the | |
| 418 // process. We assume that, for a fixed S-O length, as we add more | |
| 419 // young regions to the CSet, the GC efficiency will only go up (I'll | |
| 420 // skip the proof). So, using a binary search to optimize this process | |
| 421 // makes perfect sense. | |
| 422 // | |
| 423 // (b) The middle loop will fix the S-O length before calling the | |
| 424 // innermost one. It will vary it between two parameters, increasing | |
| 425 // it by a given increment. | |
| 426 // | |
| 427 // (c) The outermost loop will call the middle loop three times. | |
| 428 // (1) The first time it will explore all possible S-O length values | |
| 429 // from 0 to as large as it can get, using a coarse increment (to | |
| 430 // quickly "home in" to where the optimal seems to be). | |
| 431 // (2) The second time it will explore the values around the optimal | |
| 432 // that was found by the first iteration using a fine increment. | |
| 433 // (3) Once the optimal config has been determined by the second | |
| 434 // iteration, we'll redo the calculation, but setting the S-O length | |
| 435 // to 95% of the optimal to make sure we sample the "area" | |
| 436 // around the optimal length to get up-to-date survival rate data | |
| 437 // | |
| 438 // Termination conditions for the iterations are several: the pause | |
| 439 // time is over the limit, we do not have enough to-space, etc. | |
| 440 | |
| 441 void G1CollectorPolicy::calculate_young_list_target_config(size_t rs_lengths) { | |
| 442 guarantee( adaptive_young_list_length(), "pre-condition" ); | |
| 443 | |
| 444 double start_time_sec = os::elapsedTime(); | |
| 751 | 445 size_t min_reserve_perc = MAX2((size_t)2, (size_t)G1MinReservePercent); |
| 342 | 446 min_reserve_perc = MIN2((size_t) 50, min_reserve_perc); |
| 447 size_t reserve_regions = | |
| 448 (size_t) ((double) min_reserve_perc * (double) _g1->n_regions() / 100.0); | |
| 449 | |
| 450 if (full_young_gcs() && _free_regions_at_end_of_collection > 0) { | |
| 451 // we are in fully-young mode and there are free regions in the heap | |
| 452 | |
| 545 | 453 double survivor_regions_evac_time = |
| 454 predict_survivor_regions_evac_time(); | |
| 455 | |
| 342 | 456 size_t min_so_length = 0; |
| 457 size_t max_so_length = 0; | |
| 458 | |
| 459 if (G1UseScanOnlyPrefix) { | |
| 460 if (_all_pause_times_ms->num() < 3) { | |
| 461 // we won't use a scan-only set at the beginning to allow the rest | |
| 462 // of the predictors to warm up | |
| 463 min_so_length = 0; | |
| 464 max_so_length = 0; | |
| 465 } else if (_cost_per_scan_only_region_ms_seq->num() < 3) { | |
| 466 // then, we'll only set the S-O set to 1 for a little bit of time, | |
| 467 // to get enough information on the scanning cost | |
| 468 min_so_length = 1; | |
| 469 max_so_length = 1; | |
| 470 } else if (_in_marking_window || _last_full_young_gc) { | |
| 471 // no S-O prefix during a marking phase either, as at the end | |
| 472 // of the marking phase we'll have to use a very small young | |
| 473 // length target to fill up the rest of the CSet with | |
| 474 // non-young regions and, if we have lots of scan-only regions | |
| 475 // left-over, we will not be able to add any more non-young | |
| 476 // regions. | |
| 477 min_so_length = 0; | |
| 478 max_so_length = 0; | |
| 479 } else { | |
| 480 // this is the common case; we'll never reach the maximum, we | |
| 481 // one of the end conditions will fire well before that | |
| 482 // (hopefully!) | |
| 483 min_so_length = 0; | |
| 484 max_so_length = _free_regions_at_end_of_collection - 1; | |
| 485 } | |
| 486 } else { | |
| 487 // no S-O prefix, as the switch is not set, but we still need to | |
| 488 // do one iteration to calculate the best young target that | |
| 489 // meets the pause time; this way we reuse the same code instead | |
| 490 // of replicating it | |
| 491 min_so_length = 0; | |
| 492 max_so_length = 0; | |
| 493 } | |
| 494 | |
| 495 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; | |
| 496 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); | |
| 497 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); | |
| 498 size_t scanned_cards; | |
| 499 if (full_young_gcs()) | |
| 500 scanned_cards = predict_young_card_num(adj_rs_lengths); | |
| 501 else | |
| 502 scanned_cards = predict_non_young_card_num(adj_rs_lengths); | |
| 503 // calculate this once, so that we don't have to recalculate it in | |
| 504 // the innermost loop | |
| 545 | 505 double base_time_ms = predict_base_elapsed_time_ms(pending_cards, scanned_cards) |
| 506 + survivor_regions_evac_time; | |
| 342 | 507 // the result |
| 508 size_t final_young_length = 0; | |
| 509 size_t final_so_length = 0; | |
| 510 double final_gc_eff = 0.0; | |
| 511 // we'll also keep track of how many times we go into the inner loop | |
| 512 // this is for profiling reasons | |
| 513 size_t calculations = 0; | |
| 514 | |
| 515 // this determines which of the three iterations the outer loop is in | |
| 516 typedef enum { | |
| 517 pass_type_coarse, | |
| 518 pass_type_fine, | |
| 519 pass_type_final | |
| 520 } pass_type_t; | |
| 521 | |
| 522 // range of the outer loop's iteration | |
| 523 size_t from_so_length = min_so_length; | |
| 524 size_t to_so_length = max_so_length; | |
| 525 guarantee( from_so_length <= to_so_length, "invariant" ); | |
| 526 | |
| 527 // this will keep the S-O length that's found by the second | |
| 528 // iteration of the outer loop; we'll keep it just in case the third | |
| 529 // iteration fails to find something | |
| 530 size_t fine_so_length = 0; | |
| 531 | |
| 532 // the increment step for the coarse (first) iteration | |
| 533 size_t so_coarse_increments = 5; | |
| 534 | |
| 535 // the common case, we'll start with the coarse iteration | |
| 536 pass_type_t pass = pass_type_coarse; | |
| 537 size_t so_length_incr = so_coarse_increments; | |
| 538 | |
| 539 if (from_so_length == to_so_length) { | |
| 540 // not point in doing the coarse iteration, we'll go directly into | |
| 541 // the fine one (we essentially trying to find the optimal young | |
| 542 // length for a fixed S-O length). | |
| 543 so_length_incr = 1; | |
| 544 pass = pass_type_final; | |
| 545 } else if (to_so_length - from_so_length < 3 * so_coarse_increments) { | |
| 546 // again, the range is too short so no point in foind the coarse | |
| 547 // iteration either | |
| 548 so_length_incr = 1; | |
| 549 pass = pass_type_fine; | |
| 550 } | |
| 551 | |
| 552 bool done = false; | |
| 553 // this is the outermost loop | |
| 554 while (!done) { | |
| 545 | 555 #ifdef TRACE_CALC_YOUNG_CONFIG |
| 342 | 556 // leave this in for debugging, just in case |
| 557 gclog_or_tty->print_cr("searching between " SIZE_FORMAT " and " SIZE_FORMAT | |
| 558 ", incr " SIZE_FORMAT ", pass %s", | |
| 559 from_so_length, to_so_length, so_length_incr, | |
| 560 (pass == pass_type_coarse) ? "coarse" : | |
| 561 (pass == pass_type_fine) ? "fine" : "final"); | |
| 545 | 562 #endif // TRACE_CALC_YOUNG_CONFIG |
| 342 | 563 |
| 564 size_t so_length = from_so_length; | |
| 565 size_t init_free_regions = | |
| 566 MAX2((size_t)0, | |
| 567 _free_regions_at_end_of_collection + | |
| 568 _scan_only_regions_at_end_of_collection - reserve_regions); | |
| 569 | |
| 570 // this determines whether a configuration was found | |
| 571 bool gc_eff_set = false; | |
| 572 // this is the middle loop | |
| 573 while (so_length <= to_so_length) { | |
| 574 // base time, which excludes region-related time; again we | |
| 575 // calculate it once to avoid recalculating it in the | |
| 576 // innermost loop | |
| 577 double base_time_with_so_ms = | |
| 578 base_time_ms + predict_scan_only_time_ms(so_length); | |
| 579 // it's already over the pause target, go around | |
| 580 if (base_time_with_so_ms > target_pause_time_ms) | |
| 581 break; | |
| 582 | |
| 583 size_t starting_young_length = so_length+1; | |
| 584 | |
| 585 // we make sure that the short young length that makes sense | |
| 586 // (one more than the S-O length) is feasible | |
| 587 size_t min_young_length = starting_young_length; | |
| 588 double min_gc_eff; | |
| 589 bool min_ok; | |
| 590 ++calculations; | |
| 591 min_ok = predict_gc_eff(min_young_length, so_length, | |
| 592 base_time_with_so_ms, | |
| 593 init_free_regions, target_pause_time_ms, | |
| 594 &min_gc_eff); | |
| 595 | |
| 596 if (min_ok) { | |
| 597 // the shortest young length is indeed feasible; we'll know | |
| 598 // set up the max young length and we'll do a binary search | |
| 599 // between min_young_length and max_young_length | |
| 600 size_t max_young_length = _free_regions_at_end_of_collection - 1; | |
| 601 double max_gc_eff = 0.0; | |
| 602 bool max_ok = false; | |
| 603 | |
| 604 // the innermost loop! (finally!) | |
| 605 while (max_young_length > min_young_length) { | |
| 606 // we'll make sure that min_young_length is always at a | |
| 607 // feasible config | |
| 608 guarantee( min_ok, "invariant" ); | |
| 609 | |
| 610 ++calculations; | |
| 611 max_ok = predict_gc_eff(max_young_length, so_length, | |
| 612 base_time_with_so_ms, | |
| 613 init_free_regions, target_pause_time_ms, | |
| 614 &max_gc_eff); | |
| 615 | |
| 616 size_t diff = (max_young_length - min_young_length) / 2; | |
| 617 if (max_ok) { | |
| 618 min_young_length = max_young_length; | |
| 619 min_gc_eff = max_gc_eff; | |
| 620 min_ok = true; | |
| 621 } | |
| 622 max_young_length = min_young_length + diff; | |
| 623 } | |
| 624 | |
| 625 // the innermost loop found a config | |
| 626 guarantee( min_ok, "invariant" ); | |
| 627 if (min_gc_eff > final_gc_eff) { | |
| 628 // it's the best config so far, so we'll keep it | |
| 629 final_gc_eff = min_gc_eff; | |
| 630 final_young_length = min_young_length; | |
| 631 final_so_length = so_length; | |
| 632 gc_eff_set = true; | |
| 633 } | |
| 634 } | |
| 635 | |
| 636 // incremental the fixed S-O length and go around | |
| 637 so_length += so_length_incr; | |
| 638 } | |
| 639 | |
| 640 // this is the end of the outermost loop and we need to decide | |
| 641 // what to do during the next iteration | |
| 642 if (pass == pass_type_coarse) { | |
| 643 // we just did the coarse pass (first iteration) | |
| 644 | |
| 645 if (!gc_eff_set) | |
| 646 // we didn't find a feasible config so we'll just bail out; of | |
| 647 // course, it might be the case that we missed it; but I'd say | |
| 648 // it's a bit unlikely | |
| 649 done = true; | |
| 650 else { | |
| 651 // We did find a feasible config with optimal GC eff during | |
| 652 // the first pass. So the second pass we'll only consider the | |
| 653 // S-O lengths around that config with a fine increment. | |
| 654 | |
| 655 guarantee( so_length_incr == so_coarse_increments, "invariant" ); | |
| 656 guarantee( final_so_length >= min_so_length, "invariant" ); | |
| 657 | |
| 545 | 658 #ifdef TRACE_CALC_YOUNG_CONFIG |
| 342 | 659 // leave this in for debugging, just in case |
| 660 gclog_or_tty->print_cr(" coarse pass: SO length " SIZE_FORMAT, | |
| 661 final_so_length); | |
| 545 | 662 #endif // TRACE_CALC_YOUNG_CONFIG |
| 342 | 663 |
| 664 from_so_length = | |
| 665 (final_so_length - min_so_length > so_coarse_increments) ? | |
| 666 final_so_length - so_coarse_increments + 1 : min_so_length; | |
| 667 to_so_length = | |
| 668 (max_so_length - final_so_length > so_coarse_increments) ? | |
| 669 final_so_length + so_coarse_increments - 1 : max_so_length; | |
| 670 | |
| 671 pass = pass_type_fine; | |
| 672 so_length_incr = 1; | |
| 673 } | |
| 674 } else if (pass == pass_type_fine) { | |
| 675 // we just finished the second pass | |
| 676 | |
| 677 if (!gc_eff_set) { | |
| 678 // we didn't find a feasible config (yes, it's possible; | |
| 679 // notice that, sometimes, we go directly into the fine | |
| 680 // iteration and skip the coarse one) so we bail out | |
| 681 done = true; | |
| 682 } else { | |
| 683 // We did find a feasible config with optimal GC eff | |
| 684 guarantee( so_length_incr == 1, "invariant" ); | |
| 685 | |
| 686 if (final_so_length == 0) { | |
| 687 // The config is of an empty S-O set, so we'll just bail out | |
| 688 done = true; | |
| 689 } else { | |
| 690 // we'll go around once more, setting the S-O length to 95% | |
| 691 // of the optimal | |
| 692 size_t new_so_length = 950 * final_so_length / 1000; | |
| 693 | |
| 545 | 694 #ifdef TRACE_CALC_YOUNG_CONFIG |
| 342 | 695 // leave this in for debugging, just in case |
| 696 gclog_or_tty->print_cr(" fine pass: SO length " SIZE_FORMAT | |
| 697 ", setting it to " SIZE_FORMAT, | |
| 698 final_so_length, new_so_length); | |
| 545 | 699 #endif // TRACE_CALC_YOUNG_CONFIG |
| 342 | 700 |
| 701 from_so_length = new_so_length; | |
| 702 to_so_length = new_so_length; | |
| 703 fine_so_length = final_so_length; | |
| 704 | |
| 705 pass = pass_type_final; | |
| 706 } | |
| 707 } | |
| 708 } else if (pass == pass_type_final) { | |
| 709 // we just finished the final (third) pass | |
| 710 | |
| 711 if (!gc_eff_set) | |
| 712 // we didn't find a feasible config, so we'll just use the one | |
| 713 // we found during the second pass, which we saved | |
| 714 final_so_length = fine_so_length; | |
| 715 | |
| 716 // and we're done! | |
| 717 done = true; | |
| 718 } else { | |
| 719 guarantee( false, "should never reach here" ); | |
| 720 } | |
| 721 | |
| 722 // we now go around the outermost loop | |
| 723 } | |
| 724 | |
| 725 // we should have at least one region in the target young length | |
| 545 | 726 _young_list_target_length = |
| 727 MAX2((size_t) 1, final_young_length + _recorded_survivor_regions); | |
| 342 | 728 if (final_so_length >= final_young_length) |
| 729 // and we need to ensure that the S-O length is not greater than | |
| 730 // the target young length (this is being a bit careful) | |
| 731 final_so_length = 0; | |
| 732 _young_list_so_prefix_length = final_so_length; | |
| 733 guarantee( !_in_marking_window || !_last_full_young_gc || | |
| 734 _young_list_so_prefix_length == 0, "invariant" ); | |
| 735 | |
| 736 // let's keep an eye of how long we spend on this calculation | |
| 737 // right now, I assume that we'll print it when we need it; we | |
| 738 // should really adde it to the breakdown of a pause | |
| 739 double end_time_sec = os::elapsedTime(); | |
| 740 double elapsed_time_ms = (end_time_sec - start_time_sec) * 1000.0; | |
| 741 | |
| 545 | 742 #ifdef TRACE_CALC_YOUNG_CONFIG |
| 342 | 743 // leave this in for debugging, just in case |
| 744 gclog_or_tty->print_cr("target = %1.1lf ms, young = " SIZE_FORMAT | |
| 745 ", SO = " SIZE_FORMAT ", " | |
| 746 "elapsed %1.2lf ms, calcs: " SIZE_FORMAT " (%s%s) " | |
| 747 SIZE_FORMAT SIZE_FORMAT, | |
| 748 target_pause_time_ms, | |
| 749 _young_list_target_length - _young_list_so_prefix_length, | |
| 750 _young_list_so_prefix_length, | |
| 751 elapsed_time_ms, | |
| 752 calculations, | |
| 753 full_young_gcs() ? "full" : "partial", | |
| 754 should_initiate_conc_mark() ? " i-m" : "", | |
| 545 | 755 _in_marking_window, |
| 756 _in_marking_window_im); | |
| 757 #endif // TRACE_CALC_YOUNG_CONFIG | |
| 342 | 758 |
| 759 if (_young_list_target_length < _young_list_min_length) { | |
| 760 // bummer; this means that, if we do a pause when the optimal | |
| 761 // config dictates, we'll violate the pause spacing target (the | |
| 762 // min length was calculate based on the application's current | |
| 763 // alloc rate); | |
| 764 | |
| 765 // so, we have to bite the bullet, and allocate the minimum | |
| 766 // number. We'll violate our target, but we just can't meet it. | |
| 767 | |
| 768 size_t so_length = 0; | |
| 769 // a note further up explains why we do not want an S-O length | |
| 770 // during marking | |
| 771 if (!_in_marking_window && !_last_full_young_gc) | |
| 772 // but we can still try to see whether we can find an optimal | |
| 773 // S-O length | |
| 774 so_length = calculate_optimal_so_length(_young_list_min_length); | |
| 775 | |
| 545 | 776 #ifdef TRACE_CALC_YOUNG_CONFIG |
| 342 | 777 // leave this in for debugging, just in case |
| 778 gclog_or_tty->print_cr("adjusted target length from " | |
| 779 SIZE_FORMAT " to " SIZE_FORMAT | |
| 780 ", SO " SIZE_FORMAT, | |
| 781 _young_list_target_length, _young_list_min_length, | |
| 782 so_length); | |
| 545 | 783 #endif // TRACE_CALC_YOUNG_CONFIG |
| 342 | 784 |
| 785 _young_list_target_length = | |
| 786 MAX2(_young_list_min_length, (size_t)1); | |
| 787 _young_list_so_prefix_length = so_length; | |
| 788 } | |
| 789 } else { | |
| 790 // we are in a partially-young mode or we've run out of regions (due | |
| 791 // to evacuation failure) | |
| 792 | |
| 545 | 793 #ifdef TRACE_CALC_YOUNG_CONFIG |
| 342 | 794 // leave this in for debugging, just in case |
| 795 gclog_or_tty->print_cr("(partial) setting target to " SIZE_FORMAT | |
| 796 ", SO " SIZE_FORMAT, | |
| 797 _young_list_min_length, 0); | |
| 545 | 798 #endif // TRACE_CALC_YOUNG_CONFIG |
| 342 | 799 |
| 800 // we'll do the pause as soon as possible and with no S-O prefix | |
| 801 // (see above for the reasons behind the latter) | |
| 802 _young_list_target_length = | |
| 803 MAX2(_young_list_min_length, (size_t) 1); | |
| 804 _young_list_so_prefix_length = 0; | |
| 805 } | |
| 806 | |
| 807 _rs_lengths_prediction = rs_lengths; | |
| 808 } | |
| 809 | |
| 810 // This is used by: calculate_optimal_so_length(length). It returns | |
| 811 // the GC eff and predicted pause time for a particular config | |
| 812 void | |
| 813 G1CollectorPolicy::predict_gc_eff(size_t young_length, | |
| 814 size_t so_length, | |
| 815 double base_time_ms, | |
| 816 double* ret_gc_eff, | |
| 817 double* ret_pause_time_ms) { | |
| 818 double so_time_ms = predict_scan_only_time_ms(so_length); | |
| 819 double accum_surv_rate_adj = 0.0; | |
| 820 if (so_length > 0) | |
| 821 accum_surv_rate_adj = accum_yg_surv_rate_pred((int)(so_length - 1)); | |
| 822 double accum_surv_rate = | |
| 823 accum_yg_surv_rate_pred((int)(young_length - 1)) - accum_surv_rate_adj; | |
| 824 size_t bytes_to_copy = | |
| 825 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); | |
| 826 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); | |
| 827 double young_other_time_ms = | |
| 828 predict_young_other_time_ms(young_length - so_length); | |
| 829 double pause_time_ms = | |
| 830 base_time_ms + so_time_ms + copy_time_ms + young_other_time_ms; | |
| 831 size_t reclaimed_bytes = | |
| 832 (young_length - so_length) * HeapRegion::GrainBytes - bytes_to_copy; | |
| 833 double gc_eff = (double) reclaimed_bytes / pause_time_ms; | |
| 834 | |
| 835 *ret_gc_eff = gc_eff; | |
| 836 *ret_pause_time_ms = pause_time_ms; | |
| 837 } | |
| 838 | |
| 839 // This is used by: calculate_young_list_target_config(rs_length). It | |
| 840 // returns the GC eff of a particular config. It returns false if that | |
| 841 // config violates any of the end conditions of the search in the | |
| 842 // calling method, or true upon success. The end conditions were put | |
| 843 // here since it's called twice and it was best not to replicate them | |
| 844 // in the caller. Also, passing the parameteres avoids having to | |
| 845 // recalculate them in the innermost loop. | |
| 846 bool | |
| 847 G1CollectorPolicy::predict_gc_eff(size_t young_length, | |
| 848 size_t so_length, | |
| 849 double base_time_with_so_ms, | |
| 850 size_t init_free_regions, | |
| 851 double target_pause_time_ms, | |
| 852 double* ret_gc_eff) { | |
| 853 *ret_gc_eff = 0.0; | |
| 854 | |
| 855 if (young_length >= init_free_regions) | |
| 856 // end condition 1: not enough space for the young regions | |
| 857 return false; | |
| 858 | |
| 859 double accum_surv_rate_adj = 0.0; | |
| 860 if (so_length > 0) | |
| 861 accum_surv_rate_adj = accum_yg_surv_rate_pred((int)(so_length - 1)); | |
| 862 double accum_surv_rate = | |
| 863 accum_yg_surv_rate_pred((int)(young_length - 1)) - accum_surv_rate_adj; | |
| 864 size_t bytes_to_copy = | |
| 865 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); | |
| 866 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); | |
| 867 double young_other_time_ms = | |
| 868 predict_young_other_time_ms(young_length - so_length); | |
| 869 double pause_time_ms = | |
| 870 base_time_with_so_ms + copy_time_ms + young_other_time_ms; | |
| 871 | |
| 872 if (pause_time_ms > target_pause_time_ms) | |
| 873 // end condition 2: over the target pause time | |
| 874 return false; | |
| 875 | |
| 876 size_t reclaimed_bytes = | |
| 877 (young_length - so_length) * HeapRegion::GrainBytes - bytes_to_copy; | |
| 878 size_t free_bytes = | |
| 879 (init_free_regions - young_length) * HeapRegion::GrainBytes; | |
| 880 | |
| 881 if ((2.0 + sigma()) * (double) bytes_to_copy > (double) free_bytes) | |
| 882 // end condition 3: out of to-space (conservatively) | |
| 883 return false; | |
| 884 | |
| 885 // success! | |
| 886 double gc_eff = (double) reclaimed_bytes / pause_time_ms; | |
| 887 *ret_gc_eff = gc_eff; | |
| 888 | |
| 889 return true; | |
| 890 } | |
| 891 | |
| 545 | 892 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
| 893 double survivor_regions_evac_time = 0.0; | |
| 894 for (HeapRegion * r = _recorded_survivor_head; | |
| 895 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
| 896 r = r->get_next_young_region()) { | |
| 897 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); | |
| 898 } | |
| 899 return survivor_regions_evac_time; | |
| 900 } | |
| 901 | |
| 342 | 902 void G1CollectorPolicy::check_prediction_validity() { |
| 903 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); | |
| 904 | |
| 905 size_t rs_lengths = _g1->young_list_sampled_rs_lengths(); | |
| 906 if (rs_lengths > _rs_lengths_prediction) { | |
| 907 // add 10% to avoid having to recalculate often | |
| 908 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
| 909 calculate_young_list_target_config(rs_lengths_prediction); | |
| 910 } | |
| 911 } | |
| 912 | |
| 913 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, | |
| 914 bool is_tlab, | |
| 915 bool* gc_overhead_limit_was_exceeded) { | |
| 916 guarantee(false, "Not using this policy feature yet."); | |
| 917 return NULL; | |
| 918 } | |
| 919 | |
| 920 // This method controls how a collector handles one or more | |
| 921 // of its generations being fully allocated. | |
| 922 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
| 923 bool is_tlab) { | |
| 924 guarantee(false, "Not using this policy feature yet."); | |
| 925 return NULL; | |
| 926 } | |
| 927 | |
| 928 | |
| 929 #ifndef PRODUCT | |
| 930 bool G1CollectorPolicy::verify_young_ages() { | |
| 931 HeapRegion* head = _g1->young_list_first_region(); | |
| 932 return | |
| 933 verify_young_ages(head, _short_lived_surv_rate_group); | |
| 934 // also call verify_young_ages on any additional surv rate groups | |
| 935 } | |
| 936 | |
| 937 bool | |
| 938 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
| 939 SurvRateGroup *surv_rate_group) { | |
| 940 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
| 941 | |
| 942 const char* name = surv_rate_group->name(); | |
| 943 bool ret = true; | |
| 944 int prev_age = -1; | |
| 945 | |
| 946 for (HeapRegion* curr = head; | |
| 947 curr != NULL; | |
| 948 curr = curr->get_next_young_region()) { | |
| 949 SurvRateGroup* group = curr->surv_rate_group(); | |
| 950 if (group == NULL && !curr->is_survivor()) { | |
| 951 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
| 952 ret = false; | |
| 953 } | |
| 954 | |
| 955 if (surv_rate_group == group) { | |
| 956 int age = curr->age_in_surv_rate_group(); | |
| 957 | |
| 958 if (age < 0) { | |
| 959 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
| 960 ret = false; | |
| 961 } | |
| 962 | |
| 963 if (age <= prev_age) { | |
| 964 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
| 965 "(%d, %d)", name, age, prev_age); | |
| 966 ret = false; | |
| 967 } | |
| 968 prev_age = age; | |
| 969 } | |
| 970 } | |
| 971 | |
| 972 return ret; | |
| 973 } | |
| 974 #endif // PRODUCT | |
| 975 | |
| 976 void G1CollectorPolicy::record_full_collection_start() { | |
| 977 _cur_collection_start_sec = os::elapsedTime(); | |
| 978 // Release the future to-space so that it is available for compaction into. | |
| 979 _g1->set_full_collection(); | |
| 980 } | |
| 981 | |
| 982 void G1CollectorPolicy::record_full_collection_end() { | |
| 983 // Consider this like a collection pause for the purposes of allocation | |
| 984 // since last pause. | |
| 985 double end_sec = os::elapsedTime(); | |
| 986 double full_gc_time_sec = end_sec - _cur_collection_start_sec; | |
| 987 double full_gc_time_ms = full_gc_time_sec * 1000.0; | |
| 988 | |
| 989 checkpoint_conc_overhead(); | |
| 990 | |
| 991 _all_full_gc_times_ms->add(full_gc_time_ms); | |
| 992 | |
|
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|
993 update_recent_gc_times(end_sec, full_gc_time_ms); |
| 342 | 994 |
| 995 _g1->clear_full_collection(); | |
| 996 | |
| 997 // "Nuke" the heuristics that control the fully/partially young GC | |
| 998 // transitions and make sure we start with fully young GCs after the | |
| 999 // Full GC. | |
| 1000 set_full_young_gcs(true); | |
| 1001 _last_full_young_gc = false; | |
| 1002 _should_revert_to_full_young_gcs = false; | |
| 1003 _should_initiate_conc_mark = false; | |
| 1004 _known_garbage_bytes = 0; | |
| 1005 _known_garbage_ratio = 0.0; | |
| 1006 _in_marking_window = false; | |
| 1007 _in_marking_window_im = false; | |
| 1008 | |
| 1009 _short_lived_surv_rate_group->record_scan_only_prefix(0); | |
| 1010 _short_lived_surv_rate_group->start_adding_regions(); | |
| 1011 // also call this on any additional surv rate groups | |
| 1012 | |
| 545 | 1013 record_survivor_regions(0, NULL, NULL); |
| 1014 | |
| 342 | 1015 _prev_region_num_young = _region_num_young; |
| 1016 _prev_region_num_tenured = _region_num_tenured; | |
| 1017 | |
| 1018 _free_regions_at_end_of_collection = _g1->free_regions(); | |
| 1019 _scan_only_regions_at_end_of_collection = 0; | |
| 545 | 1020 // Reset survivors SurvRateGroup. |
| 1021 _survivor_surv_rate_group->reset(); | |
| 342 | 1022 calculate_young_list_min_length(); |
| 1023 calculate_young_list_target_config(); | |
| 1024 } | |
| 1025 | |
| 1026 void G1CollectorPolicy::record_before_bytes(size_t bytes) { | |
| 1027 _bytes_in_to_space_before_gc += bytes; | |
| 1028 } | |
| 1029 | |
| 1030 void G1CollectorPolicy::record_after_bytes(size_t bytes) { | |
| 1031 _bytes_in_to_space_after_gc += bytes; | |
| 1032 } | |
| 1033 | |
| 1034 void G1CollectorPolicy::record_stop_world_start() { | |
| 1035 _stop_world_start = os::elapsedTime(); | |
| 1036 } | |
| 1037 | |
| 1038 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, | |
| 1039 size_t start_used) { | |
| 1040 if (PrintGCDetails) { | |
| 1041 gclog_or_tty->stamp(PrintGCTimeStamps); | |
| 1042 gclog_or_tty->print("[GC pause"); | |
| 1043 if (in_young_gc_mode()) | |
| 1044 gclog_or_tty->print(" (%s)", full_young_gcs() ? "young" : "partial"); | |
| 1045 } | |
| 1046 | |
| 1047 assert(_g1->used_regions() == _g1->recalculate_used_regions(), | |
| 1048 "sanity"); | |
| 636 | 1049 assert(_g1->used() == _g1->recalculate_used(), "sanity"); |
| 342 | 1050 |
| 1051 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
| 1052 _all_stop_world_times_ms->add(s_w_t_ms); | |
| 1053 _stop_world_start = 0.0; | |
| 1054 | |
| 1055 _cur_collection_start_sec = start_time_sec; | |
| 1056 _cur_collection_pause_used_at_start_bytes = start_used; | |
| 1057 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); | |
| 1058 _pending_cards = _g1->pending_card_num(); | |
| 1059 _max_pending_cards = _g1->max_pending_card_num(); | |
| 1060 | |
| 1061 _bytes_in_to_space_before_gc = 0; | |
| 1062 _bytes_in_to_space_after_gc = 0; | |
| 1063 _bytes_in_collection_set_before_gc = 0; | |
| 1064 | |
| 1065 #ifdef DEBUG | |
| 1066 // initialise these to something well known so that we can spot | |
| 1067 // if they are not set properly | |
| 1068 | |
| 1069 for (int i = 0; i < _parallel_gc_threads; ++i) { | |
| 1070 _par_last_ext_root_scan_times_ms[i] = -666.0; | |
| 1071 _par_last_mark_stack_scan_times_ms[i] = -666.0; | |
| 1072 _par_last_scan_only_times_ms[i] = -666.0; | |
| 1073 _par_last_scan_only_regions_scanned[i] = -666.0; | |
| 1074 _par_last_update_rs_start_times_ms[i] = -666.0; | |
| 1075 _par_last_update_rs_times_ms[i] = -666.0; | |
| 1076 _par_last_update_rs_processed_buffers[i] = -666.0; | |
| 1077 _par_last_scan_rs_start_times_ms[i] = -666.0; | |
| 1078 _par_last_scan_rs_times_ms[i] = -666.0; | |
| 1079 _par_last_scan_new_refs_times_ms[i] = -666.0; | |
| 1080 _par_last_obj_copy_times_ms[i] = -666.0; | |
| 1081 _par_last_termination_times_ms[i] = -666.0; | |
| 1082 } | |
| 1083 #endif | |
| 1084 | |
| 1085 for (int i = 0; i < _aux_num; ++i) { | |
| 1086 _cur_aux_times_ms[i] = 0.0; | |
| 1087 _cur_aux_times_set[i] = false; | |
| 1088 } | |
| 1089 | |
| 1090 _satb_drain_time_set = false; | |
| 1091 _last_satb_drain_processed_buffers = -1; | |
| 1092 | |
| 1093 if (in_young_gc_mode()) | |
| 1094 _last_young_gc_full = false; | |
| 1095 | |
| 1096 | |
| 1097 // do that for any other surv rate groups | |
| 1098 _short_lived_surv_rate_group->stop_adding_regions(); | |
| 1099 size_t short_lived_so_length = _young_list_so_prefix_length; | |
| 1100 _short_lived_surv_rate_group->record_scan_only_prefix(short_lived_so_length); | |
| 1101 tag_scan_only(short_lived_so_length); | |
| 1102 | |
| 751 | 1103 if (G1UseSurvivorSpaces) { |
| 545 | 1104 _survivors_age_table.clear(); |
| 1105 } | |
| 1106 | |
| 342 | 1107 assert( verify_young_ages(), "region age verification" ); |
| 1108 } | |
| 1109 | |
| 1110 void G1CollectorPolicy::tag_scan_only(size_t short_lived_scan_only_length) { | |
| 1111 // done in a way that it can be extended for other surv rate groups too... | |
| 1112 | |
| 1113 HeapRegion* head = _g1->young_list_first_region(); | |
| 1114 bool finished_short_lived = (short_lived_scan_only_length == 0); | |
| 1115 | |
| 1116 if (finished_short_lived) | |
| 1117 return; | |
| 1118 | |
| 1119 for (HeapRegion* curr = head; | |
| 1120 curr != NULL; | |
| 1121 curr = curr->get_next_young_region()) { | |
| 1122 SurvRateGroup* surv_rate_group = curr->surv_rate_group(); | |
| 1123 int age = curr->age_in_surv_rate_group(); | |
| 1124 | |
| 1125 if (surv_rate_group == _short_lived_surv_rate_group) { | |
| 1126 if ((size_t)age < short_lived_scan_only_length) | |
| 1127 curr->set_scan_only(); | |
| 1128 else | |
| 1129 finished_short_lived = true; | |
| 1130 } | |
| 1131 | |
| 1132 | |
| 1133 if (finished_short_lived) | |
| 1134 return; | |
| 1135 } | |
| 1136 | |
| 1137 guarantee( false, "we should never reach here" ); | |
| 1138 } | |
| 1139 | |
| 1140 void G1CollectorPolicy::record_mark_closure_time(double mark_closure_time_ms) { | |
| 1141 _mark_closure_time_ms = mark_closure_time_ms; | |
| 1142 } | |
| 1143 | |
| 1144 void G1CollectorPolicy::record_concurrent_mark_init_start() { | |
| 1145 _mark_init_start_sec = os::elapsedTime(); | |
| 1146 guarantee(!in_young_gc_mode(), "should not do be here in young GC mode"); | |
| 1147 } | |
| 1148 | |
| 1149 void G1CollectorPolicy::record_concurrent_mark_init_end_pre(double | |
| 1150 mark_init_elapsed_time_ms) { | |
| 1151 _during_marking = true; | |
| 1152 _should_initiate_conc_mark = false; | |
| 1153 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; | |
| 1154 } | |
| 1155 | |
| 1156 void G1CollectorPolicy::record_concurrent_mark_init_end() { | |
| 1157 double end_time_sec = os::elapsedTime(); | |
| 1158 double elapsed_time_ms = (end_time_sec - _mark_init_start_sec) * 1000.0; | |
| 1159 _concurrent_mark_init_times_ms->add(elapsed_time_ms); | |
| 1160 checkpoint_conc_overhead(); | |
| 1161 record_concurrent_mark_init_end_pre(elapsed_time_ms); | |
| 1162 | |
| 1163 _mmu_tracker->add_pause(_mark_init_start_sec, end_time_sec, true); | |
| 1164 } | |
| 1165 | |
| 1166 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
| 1167 _mark_remark_start_sec = os::elapsedTime(); | |
| 1168 _during_marking = false; | |
| 1169 } | |
| 1170 | |
| 1171 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
| 1172 double end_time_sec = os::elapsedTime(); | |
| 1173 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
| 1174 checkpoint_conc_overhead(); | |
| 1175 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
| 1176 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
| 1177 _prev_collection_pause_end_ms += elapsed_time_ms; | |
| 1178 | |
| 1179 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
| 1180 } | |
| 1181 | |
| 1182 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
| 1183 _mark_cleanup_start_sec = os::elapsedTime(); | |
| 1184 } | |
| 1185 | |
| 1186 void | |
| 1187 G1CollectorPolicy::record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
| 1188 size_t max_live_bytes) { | |
| 1189 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
| 1190 record_concurrent_mark_cleanup_end_work2(); | |
| 1191 } | |
| 1192 | |
| 1193 void | |
| 1194 G1CollectorPolicy:: | |
| 1195 record_concurrent_mark_cleanup_end_work1(size_t freed_bytes, | |
| 1196 size_t max_live_bytes) { | |
| 1197 if (_n_marks < 2) _n_marks++; | |
| 1198 if (G1PolicyVerbose > 0) | |
| 1199 gclog_or_tty->print_cr("At end of marking, max_live is " SIZE_FORMAT " MB " | |
| 1200 " (of " SIZE_FORMAT " MB heap).", | |
| 1201 max_live_bytes/M, _g1->capacity()/M); | |
| 1202 } | |
| 1203 | |
| 1204 // The important thing about this is that it includes "os::elapsedTime". | |
| 1205 void G1CollectorPolicy::record_concurrent_mark_cleanup_end_work2() { | |
| 1206 checkpoint_conc_overhead(); | |
| 1207 double end_time_sec = os::elapsedTime(); | |
| 1208 double elapsed_time_ms = (end_time_sec - _mark_cleanup_start_sec)*1000.0; | |
| 1209 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
| 1210 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
| 1211 _prev_collection_pause_end_ms += elapsed_time_ms; | |
| 1212 | |
| 1213 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_time_sec, true); | |
| 1214 | |
| 1215 _num_markings++; | |
| 1216 | |
| 1217 // We did a marking, so reset the "since_last_mark" variables. | |
| 1218 double considerConcMarkCost = 1.0; | |
| 1219 // If there are available processors, concurrent activity is free... | |
| 1220 if (Threads::number_of_non_daemon_threads() * 2 < | |
| 1221 os::active_processor_count()) { | |
| 1222 considerConcMarkCost = 0.0; | |
| 1223 } | |
| 1224 _n_pauses_at_mark_end = _n_pauses; | |
| 1225 _n_marks_since_last_pause++; | |
| 1226 _conc_mark_initiated = false; | |
| 1227 } | |
| 1228 | |
| 1229 void | |
| 1230 G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { | |
| 1231 if (in_young_gc_mode()) { | |
| 1232 _should_revert_to_full_young_gcs = false; | |
| 1233 _last_full_young_gc = true; | |
| 1234 _in_marking_window = false; | |
| 1235 if (adaptive_young_list_length()) | |
| 1236 calculate_young_list_target_config(); | |
| 1237 } | |
| 1238 } | |
| 1239 | |
| 1240 void G1CollectorPolicy::record_concurrent_pause() { | |
| 1241 if (_stop_world_start > 0.0) { | |
| 1242 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
| 1243 _all_yield_times_ms->add(yield_ms); | |
| 1244 } | |
| 1245 } | |
| 1246 | |
| 1247 void G1CollectorPolicy::record_concurrent_pause_end() { | |
| 1248 } | |
| 1249 | |
| 1250 void G1CollectorPolicy::record_collection_pause_end_CH_strong_roots() { | |
| 1251 _cur_CH_strong_roots_end_sec = os::elapsedTime(); | |
| 1252 _cur_CH_strong_roots_dur_ms = | |
| 1253 (_cur_CH_strong_roots_end_sec - _cur_collection_start_sec) * 1000.0; | |
| 1254 } | |
| 1255 | |
| 1256 void G1CollectorPolicy::record_collection_pause_end_G1_strong_roots() { | |
| 1257 _cur_G1_strong_roots_end_sec = os::elapsedTime(); | |
| 1258 _cur_G1_strong_roots_dur_ms = | |
| 1259 (_cur_G1_strong_roots_end_sec - _cur_CH_strong_roots_end_sec) * 1000.0; | |
| 1260 } | |
| 1261 | |
| 1262 template<class T> | |
| 1263 T sum_of(T* sum_arr, int start, int n, int N) { | |
| 1264 T sum = (T)0; | |
| 1265 for (int i = 0; i < n; i++) { | |
| 1266 int j = (start + i) % N; | |
| 1267 sum += sum_arr[j]; | |
| 1268 } | |
| 1269 return sum; | |
| 1270 } | |
| 1271 | |
| 1272 void G1CollectorPolicy::print_par_stats (int level, | |
| 1273 const char* str, | |
| 1274 double* data, | |
| 1275 bool summary) { | |
| 1276 double min = data[0], max = data[0]; | |
| 1277 double total = 0.0; | |
| 1278 int j; | |
| 1279 for (j = 0; j < level; ++j) | |
| 1280 gclog_or_tty->print(" "); | |
| 1281 gclog_or_tty->print("[%s (ms):", str); | |
| 1282 for (uint i = 0; i < ParallelGCThreads; ++i) { | |
| 1283 double val = data[i]; | |
| 1284 if (val < min) | |
| 1285 min = val; | |
| 1286 if (val > max) | |
| 1287 max = val; | |
| 1288 total += val; | |
| 1289 gclog_or_tty->print(" %3.1lf", val); | |
| 1290 } | |
| 1291 if (summary) { | |
| 1292 gclog_or_tty->print_cr(""); | |
| 1293 double avg = total / (double) ParallelGCThreads; | |
| 1294 gclog_or_tty->print(" "); | |
| 1295 for (j = 0; j < level; ++j) | |
| 1296 gclog_or_tty->print(" "); | |
| 1297 gclog_or_tty->print("Avg: %5.1lf, Min: %5.1lf, Max: %5.1lf", | |
| 1298 avg, min, max); | |
| 1299 } | |
| 1300 gclog_or_tty->print_cr("]"); | |
| 1301 } | |
| 1302 | |
| 1303 void G1CollectorPolicy::print_par_buffers (int level, | |
| 1304 const char* str, | |
| 1305 double* data, | |
| 1306 bool summary) { | |
| 1307 double min = data[0], max = data[0]; | |
| 1308 double total = 0.0; | |
| 1309 int j; | |
| 1310 for (j = 0; j < level; ++j) | |
| 1311 gclog_or_tty->print(" "); | |
| 1312 gclog_or_tty->print("[%s :", str); | |
| 1313 for (uint i = 0; i < ParallelGCThreads; ++i) { | |
| 1314 double val = data[i]; | |
| 1315 if (val < min) | |
| 1316 min = val; | |
| 1317 if (val > max) | |
| 1318 max = val; | |
| 1319 total += val; | |
| 1320 gclog_or_tty->print(" %d", (int) val); | |
| 1321 } | |
| 1322 if (summary) { | |
| 1323 gclog_or_tty->print_cr(""); | |
| 1324 double avg = total / (double) ParallelGCThreads; | |
| 1325 gclog_or_tty->print(" "); | |
| 1326 for (j = 0; j < level; ++j) | |
| 1327 gclog_or_tty->print(" "); | |
| 1328 gclog_or_tty->print("Sum: %d, Avg: %d, Min: %d, Max: %d", | |
| 1329 (int)total, (int)avg, (int)min, (int)max); | |
| 1330 } | |
| 1331 gclog_or_tty->print_cr("]"); | |
| 1332 } | |
| 1333 | |
| 1334 void G1CollectorPolicy::print_stats (int level, | |
| 1335 const char* str, | |
| 1336 double value) { | |
| 1337 for (int j = 0; j < level; ++j) | |
| 1338 gclog_or_tty->print(" "); | |
| 1339 gclog_or_tty->print_cr("[%s: %5.1lf ms]", str, value); | |
| 1340 } | |
| 1341 | |
| 1342 void G1CollectorPolicy::print_stats (int level, | |
| 1343 const char* str, | |
| 1344 int value) { | |
| 1345 for (int j = 0; j < level; ++j) | |
| 1346 gclog_or_tty->print(" "); | |
| 1347 gclog_or_tty->print_cr("[%s: %d]", str, value); | |
| 1348 } | |
| 1349 | |
| 1350 double G1CollectorPolicy::avg_value (double* data) { | |
| 1351 if (ParallelGCThreads > 0) { | |
| 1352 double ret = 0.0; | |
| 1353 for (uint i = 0; i < ParallelGCThreads; ++i) | |
| 1354 ret += data[i]; | |
| 1355 return ret / (double) ParallelGCThreads; | |
| 1356 } else { | |
| 1357 return data[0]; | |
| 1358 } | |
| 1359 } | |
| 1360 | |
| 1361 double G1CollectorPolicy::max_value (double* data) { | |
| 1362 if (ParallelGCThreads > 0) { | |
| 1363 double ret = data[0]; | |
| 1364 for (uint i = 1; i < ParallelGCThreads; ++i) | |
| 1365 if (data[i] > ret) | |
| 1366 ret = data[i]; | |
| 1367 return ret; | |
| 1368 } else { | |
| 1369 return data[0]; | |
| 1370 } | |
| 1371 } | |
| 1372 | |
| 1373 double G1CollectorPolicy::sum_of_values (double* data) { | |
| 1374 if (ParallelGCThreads > 0) { | |
| 1375 double sum = 0.0; | |
| 1376 for (uint i = 0; i < ParallelGCThreads; i++) | |
| 1377 sum += data[i]; | |
| 1378 return sum; | |
| 1379 } else { | |
| 1380 return data[0]; | |
| 1381 } | |
| 1382 } | |
| 1383 | |
| 1384 double G1CollectorPolicy::max_sum (double* data1, | |
| 1385 double* data2) { | |
| 1386 double ret = data1[0] + data2[0]; | |
| 1387 | |
| 1388 if (ParallelGCThreads > 0) { | |
| 1389 for (uint i = 1; i < ParallelGCThreads; ++i) { | |
| 1390 double data = data1[i] + data2[i]; | |
| 1391 if (data > ret) | |
| 1392 ret = data; | |
| 1393 } | |
| 1394 } | |
| 1395 return ret; | |
| 1396 } | |
| 1397 | |
| 1398 // Anything below that is considered to be zero | |
| 1399 #define MIN_TIMER_GRANULARITY 0.0000001 | |
| 1400 | |
| 677 | 1401 void G1CollectorPolicy::record_collection_pause_end(bool abandoned) { |
| 342 | 1402 double end_time_sec = os::elapsedTime(); |
| 1403 double elapsed_ms = _last_pause_time_ms; | |
| 1404 bool parallel = ParallelGCThreads > 0; | |
| 1405 double evac_ms = (end_time_sec - _cur_G1_strong_roots_end_sec) * 1000.0; | |
| 1406 size_t rs_size = | |
| 1407 _cur_collection_pause_used_regions_at_start - collection_set_size(); | |
| 1408 size_t cur_used_bytes = _g1->used(); | |
| 1409 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
| 1410 bool last_pause_included_initial_mark = false; | |
|
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1411 bool update_stats = !abandoned && !_g1->evacuation_failed(); |
| 342 | 1412 |
| 1413 #ifndef PRODUCT | |
| 1414 if (G1YoungSurvRateVerbose) { | |
| 1415 gclog_or_tty->print_cr(""); | |
| 1416 _short_lived_surv_rate_group->print(); | |
| 1417 // do that for any other surv rate groups too | |
| 1418 } | |
| 1419 #endif // PRODUCT | |
| 1420 | |
| 1421 checkpoint_conc_overhead(); | |
| 1422 | |
| 1423 if (in_young_gc_mode()) { | |
| 1424 last_pause_included_initial_mark = _should_initiate_conc_mark; | |
| 1425 if (last_pause_included_initial_mark) | |
| 1426 record_concurrent_mark_init_end_pre(0.0); | |
| 1427 | |
| 1428 size_t min_used_targ = | |
| 1429 (_g1->capacity() / 100) * (G1SteadyStateUsed - G1SteadyStateUsedDelta); | |
| 1430 | |
| 1431 if (cur_used_bytes > min_used_targ) { | |
| 1432 if (cur_used_bytes <= _prev_collection_pause_used_at_end_bytes) { | |
| 1433 } else if (!_g1->mark_in_progress() && !_last_full_young_gc) { | |
| 1434 _should_initiate_conc_mark = true; | |
| 1435 } | |
| 1436 } | |
| 1437 | |
| 1438 _prev_collection_pause_used_at_end_bytes = cur_used_bytes; | |
| 1439 } | |
| 1440 | |
| 1441 _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0, | |
| 1442 end_time_sec, false); | |
| 1443 | |
| 1444 guarantee(_cur_collection_pause_used_regions_at_start >= | |
| 1445 collection_set_size(), | |
| 1446 "Negative RS size?"); | |
| 1447 | |
| 1448 // This assert is exempted when we're doing parallel collection pauses, | |
| 1449 // because the fragmentation caused by the parallel GC allocation buffers | |
| 1450 // can lead to more memory being used during collection than was used | |
| 1451 // before. Best leave this out until the fragmentation problem is fixed. | |
| 1452 // Pauses in which evacuation failed can also lead to negative | |
| 1453 // collections, since no space is reclaimed from a region containing an | |
| 1454 // object whose evacuation failed. | |
| 1455 // Further, we're now always doing parallel collection. But I'm still | |
| 1456 // leaving this here as a placeholder for a more precise assertion later. | |
| 1457 // (DLD, 10/05.) | |
| 1458 assert((true || parallel) // Always using GC LABs now. | |
| 1459 || _g1->evacuation_failed() | |
| 1460 || _cur_collection_pause_used_at_start_bytes >= cur_used_bytes, | |
| 1461 "Negative collection"); | |
| 1462 | |
| 1463 size_t freed_bytes = | |
| 1464 _cur_collection_pause_used_at_start_bytes - cur_used_bytes; | |
| 1465 size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; | |
| 1466 double survival_fraction = | |
| 1467 (double)surviving_bytes/ | |
| 1468 (double)_collection_set_bytes_used_before; | |
| 1469 | |
| 1470 _n_pauses++; | |
| 1471 | |
|
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1472 if (update_stats) { |
| 342 | 1473 _recent_CH_strong_roots_times_ms->add(_cur_CH_strong_roots_dur_ms); |
| 1474 _recent_G1_strong_roots_times_ms->add(_cur_G1_strong_roots_dur_ms); | |
| 1475 _recent_evac_times_ms->add(evac_ms); | |
| 1476 _recent_pause_times_ms->add(elapsed_ms); | |
| 1477 | |
| 1478 _recent_rs_sizes->add(rs_size); | |
| 1479 | |
| 1480 // We exempt parallel collection from this check because Alloc Buffer | |
| 1481 // fragmentation can produce negative collections. Same with evac | |
| 1482 // failure. | |
| 1483 // Further, we're now always doing parallel collection. But I'm still | |
| 1484 // leaving this here as a placeholder for a more precise assertion later. | |
| 1485 // (DLD, 10/05. | |
| 1486 assert((true || parallel) | |
| 1487 || _g1->evacuation_failed() | |
| 1488 || surviving_bytes <= _collection_set_bytes_used_before, | |
| 1489 "Or else negative collection!"); | |
| 1490 _recent_CS_bytes_used_before->add(_collection_set_bytes_used_before); | |
| 1491 _recent_CS_bytes_surviving->add(surviving_bytes); | |
| 1492 | |
| 1493 // this is where we update the allocation rate of the application | |
| 1494 double app_time_ms = | |
| 1495 (_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms); | |
| 1496 if (app_time_ms < MIN_TIMER_GRANULARITY) { | |
| 1497 // This usually happens due to the timer not having the required | |
| 1498 // granularity. Some Linuxes are the usual culprits. | |
| 1499 // We'll just set it to something (arbitrarily) small. | |
| 1500 app_time_ms = 1.0; | |
| 1501 } | |
| 1502 size_t regions_allocated = | |
| 1503 (_region_num_young - _prev_region_num_young) + | |
| 1504 (_region_num_tenured - _prev_region_num_tenured); | |
| 1505 double alloc_rate_ms = (double) regions_allocated / app_time_ms; | |
| 1506 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
| 1507 _prev_region_num_young = _region_num_young; | |
| 1508 _prev_region_num_tenured = _region_num_tenured; | |
| 1509 | |
| 1510 double interval_ms = | |
| 1511 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
| 1512 update_recent_gc_times(end_time_sec, elapsed_ms); | |
| 1513 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; | |
| 1514 assert(recent_avg_pause_time_ratio() < 1.00, "All GC?"); | |
| 1515 } | |
| 1516 | |
| 1517 if (G1PolicyVerbose > 1) { | |
| 1518 gclog_or_tty->print_cr(" Recording collection pause(%d)", _n_pauses); | |
| 1519 } | |
| 1520 | |
| 1521 PauseSummary* summary; | |
| 677 | 1522 if (abandoned) { |
| 1523 summary = _abandoned_summary; | |
| 1524 } else { | |
| 1525 summary = _summary; | |
| 342 | 1526 } |
| 1527 | |
| 1528 double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); | |
| 1529 double mark_stack_scan_time = avg_value(_par_last_mark_stack_scan_times_ms); | |
| 1530 double scan_only_time = avg_value(_par_last_scan_only_times_ms); | |
| 1531 double scan_only_regions_scanned = | |
| 1532 sum_of_values(_par_last_scan_only_regions_scanned); | |
| 1533 double update_rs_time = avg_value(_par_last_update_rs_times_ms); | |
| 1534 double update_rs_processed_buffers = | |
| 1535 sum_of_values(_par_last_update_rs_processed_buffers); | |
| 1536 double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); | |
| 1537 double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); | |
| 1538 double termination_time = avg_value(_par_last_termination_times_ms); | |
| 1539 | |
|
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1540 double parallel_other_time = _cur_collection_par_time_ms - |
|
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1541 (update_rs_time + ext_root_scan_time + mark_stack_scan_time + |
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1542 scan_only_time + scan_rs_time + obj_copy_time + termination_time); |
|
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1543 if (update_stats) { |
| 342 | 1544 MainBodySummary* body_summary = summary->main_body_summary(); |
| 1545 guarantee(body_summary != NULL, "should not be null!"); | |
| 1546 | |
| 1547 if (_satb_drain_time_set) | |
| 1548 body_summary->record_satb_drain_time_ms(_cur_satb_drain_time_ms); | |
| 1549 else | |
| 1550 body_summary->record_satb_drain_time_ms(0.0); | |
| 1551 body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); | |
| 1552 body_summary->record_mark_stack_scan_time_ms(mark_stack_scan_time); | |
| 1553 body_summary->record_scan_only_time_ms(scan_only_time); | |
| 1554 body_summary->record_update_rs_time_ms(update_rs_time); | |
| 1555 body_summary->record_scan_rs_time_ms(scan_rs_time); | |
| 1556 body_summary->record_obj_copy_time_ms(obj_copy_time); | |
| 1557 if (parallel) { | |
| 1558 body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); | |
| 1559 body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); | |
| 1560 body_summary->record_termination_time_ms(termination_time); | |
| 1561 body_summary->record_parallel_other_time_ms(parallel_other_time); | |
| 1562 } | |
| 1563 body_summary->record_mark_closure_time_ms(_mark_closure_time_ms); | |
| 1564 } | |
| 1565 | |
| 1566 if (G1PolicyVerbose > 1) { | |
| 1567 gclog_or_tty->print_cr(" ET: %10.6f ms (avg: %10.6f ms)\n" | |
| 1568 " CH Strong: %10.6f ms (avg: %10.6f ms)\n" | |
| 1569 " G1 Strong: %10.6f ms (avg: %10.6f ms)\n" | |
| 1570 " Evac: %10.6f ms (avg: %10.6f ms)\n" | |
| 1571 " ET-RS: %10.6f ms (avg: %10.6f ms)\n" | |
| 1572 " |RS|: " SIZE_FORMAT, | |
| 1573 elapsed_ms, recent_avg_time_for_pauses_ms(), | |
| 1574 _cur_CH_strong_roots_dur_ms, recent_avg_time_for_CH_strong_ms(), | |
| 1575 _cur_G1_strong_roots_dur_ms, recent_avg_time_for_G1_strong_ms(), | |
| 1576 evac_ms, recent_avg_time_for_evac_ms(), | |
| 1577 scan_rs_time, | |
| 1578 recent_avg_time_for_pauses_ms() - | |
| 1579 recent_avg_time_for_G1_strong_ms(), | |
| 1580 rs_size); | |
| 1581 | |
| 1582 gclog_or_tty->print_cr(" Used at start: " SIZE_FORMAT"K" | |
| 1583 " At end " SIZE_FORMAT "K\n" | |
| 1584 " garbage : " SIZE_FORMAT "K" | |
| 1585 " of " SIZE_FORMAT "K\n" | |
| 1586 " survival : %6.2f%% (%6.2f%% avg)", | |
| 1587 _cur_collection_pause_used_at_start_bytes/K, | |
| 1588 _g1->used()/K, freed_bytes/K, | |
| 1589 _collection_set_bytes_used_before/K, | |
| 1590 survival_fraction*100.0, | |
| 1591 recent_avg_survival_fraction()*100.0); | |
| 1592 gclog_or_tty->print_cr(" Recent %% gc pause time: %6.2f", | |
| 1593 recent_avg_pause_time_ratio() * 100.0); | |
| 1594 } | |
| 1595 | |
| 1596 double other_time_ms = elapsed_ms; | |
| 1597 | |
| 1598 if (!abandoned) { | |
| 1599 if (_satb_drain_time_set) | |
| 1600 other_time_ms -= _cur_satb_drain_time_ms; | |
| 1601 | |
| 1602 if (parallel) | |
| 1603 other_time_ms -= _cur_collection_par_time_ms + _cur_clear_ct_time_ms; | |
| 1604 else | |
| 1605 other_time_ms -= | |
| 1606 update_rs_time + | |
| 1607 ext_root_scan_time + mark_stack_scan_time + scan_only_time + | |
| 1608 scan_rs_time + obj_copy_time; | |
| 1609 } | |
| 1610 | |
| 1611 if (PrintGCDetails) { | |
| 1612 gclog_or_tty->print_cr("%s%s, %1.8lf secs]", | |
| 677 | 1613 abandoned ? " (abandoned)" : "", |
| 342 | 1614 (last_pause_included_initial_mark) ? " (initial-mark)" : "", |
| 1615 elapsed_ms / 1000.0); | |
| 1616 | |
| 1617 if (!abandoned) { | |
| 677 | 1618 if (_satb_drain_time_set) { |
| 342 | 1619 print_stats(1, "SATB Drain Time", _cur_satb_drain_time_ms); |
| 677 | 1620 } |
| 1621 if (_last_satb_drain_processed_buffers >= 0) { | |
| 342 | 1622 print_stats(2, "Processed Buffers", _last_satb_drain_processed_buffers); |
| 677 | 1623 } |
| 1624 if (parallel) { | |
| 1625 print_stats(1, "Parallel Time", _cur_collection_par_time_ms); | |
| 1626 print_par_stats(2, "Update RS (Start)", _par_last_update_rs_start_times_ms, false); | |
| 1627 print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); | |
| 794 | 1628 print_par_buffers(3, "Processed Buffers", |
| 1629 _par_last_update_rs_processed_buffers, true); | |
| 342 | 1630 print_par_stats(2, "Ext Root Scanning", _par_last_ext_root_scan_times_ms); |
| 1631 print_par_stats(2, "Mark Stack Scanning", _par_last_mark_stack_scan_times_ms); | |
| 1632 print_par_stats(2, "Scan-Only Scanning", _par_last_scan_only_times_ms); | |
| 1633 print_par_buffers(3, "Scan-Only Regions", | |
| 1634 _par_last_scan_only_regions_scanned, true); | |
| 1635 print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms); | |
| 1636 print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms); | |
| 1637 print_par_stats(2, "Termination", _par_last_termination_times_ms); | |
| 1638 print_stats(2, "Other", parallel_other_time); | |
| 1639 print_stats(1, "Clear CT", _cur_clear_ct_time_ms); | |
| 677 | 1640 } else { |
| 1641 print_stats(1, "Update RS", update_rs_time); | |
| 794 | 1642 print_stats(2, "Processed Buffers", |
| 1643 (int)update_rs_processed_buffers); | |
| 342 | 1644 print_stats(1, "Ext Root Scanning", ext_root_scan_time); |
| 1645 print_stats(1, "Mark Stack Scanning", mark_stack_scan_time); | |
| 1646 print_stats(1, "Scan-Only Scanning", scan_only_time); | |
| 1647 print_stats(1, "Scan RS", scan_rs_time); | |
| 1648 print_stats(1, "Object Copying", obj_copy_time); | |
| 1649 } | |
| 1650 } | |
| 1651 print_stats(1, "Other", other_time_ms); | |
| 1652 for (int i = 0; i < _aux_num; ++i) { | |
| 1653 if (_cur_aux_times_set[i]) { | |
| 1654 char buffer[96]; | |
| 1655 sprintf(buffer, "Aux%d", i); | |
| 1656 print_stats(1, buffer, _cur_aux_times_ms[i]); | |
| 1657 } | |
| 1658 } | |
| 1659 } | |
| 1660 if (PrintGCDetails) | |
| 1661 gclog_or_tty->print(" ["); | |
| 1662 if (PrintGC || PrintGCDetails) | |
| 1663 _g1->print_size_transition(gclog_or_tty, | |
| 1664 _cur_collection_pause_used_at_start_bytes, | |
| 1665 _g1->used(), _g1->capacity()); | |
| 1666 if (PrintGCDetails) | |
| 1667 gclog_or_tty->print_cr("]"); | |
| 1668 | |
| 1669 _all_pause_times_ms->add(elapsed_ms); | |
|
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1670 if (update_stats) { |
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1671 summary->record_total_time_ms(elapsed_ms); |
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1672 summary->record_other_time_ms(other_time_ms); |
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1673 } |
| 342 | 1674 for (int i = 0; i < _aux_num; ++i) |
| 1675 if (_cur_aux_times_set[i]) | |
| 1676 _all_aux_times_ms[i].add(_cur_aux_times_ms[i]); | |
| 1677 | |
| 1678 // Reset marks-between-pauses counter. | |
| 1679 _n_marks_since_last_pause = 0; | |
| 1680 | |
| 1681 // Update the efficiency-since-mark vars. | |
| 1682 double proc_ms = elapsed_ms * (double) _parallel_gc_threads; | |
| 1683 if (elapsed_ms < MIN_TIMER_GRANULARITY) { | |
| 1684 // This usually happens due to the timer not having the required | |
| 1685 // granularity. Some Linuxes are the usual culprits. | |
| 1686 // We'll just set it to something (arbitrarily) small. | |
| 1687 proc_ms = 1.0; | |
| 1688 } | |
| 1689 double cur_efficiency = (double) freed_bytes / proc_ms; | |
| 1690 | |
| 1691 bool new_in_marking_window = _in_marking_window; | |
| 1692 bool new_in_marking_window_im = false; | |
| 1693 if (_should_initiate_conc_mark) { | |
| 1694 new_in_marking_window = true; | |
| 1695 new_in_marking_window_im = true; | |
| 1696 } | |
| 1697 | |
| 1698 if (in_young_gc_mode()) { | |
| 1699 if (_last_full_young_gc) { | |
| 1700 set_full_young_gcs(false); | |
| 1701 _last_full_young_gc = false; | |
| 1702 } | |
| 1703 | |
| 1704 if ( !_last_young_gc_full ) { | |
| 1705 if ( _should_revert_to_full_young_gcs || | |
| 1706 _known_garbage_ratio < 0.05 || | |
| 1707 (adaptive_young_list_length() && | |
| 1708 (get_gc_eff_factor() * cur_efficiency < predict_young_gc_eff())) ) { | |
| 1709 set_full_young_gcs(true); | |
| 1710 } | |
| 1711 } | |
| 1712 _should_revert_to_full_young_gcs = false; | |
| 1713 | |
| 1714 if (_last_young_gc_full && !_during_marking) | |
| 1715 _young_gc_eff_seq->add(cur_efficiency); | |
| 1716 } | |
| 1717 | |
| 1718 _short_lived_surv_rate_group->start_adding_regions(); | |
| 1719 // do that for any other surv rate groupsx | |
| 1720 | |
| 1721 // <NEW PREDICTION> | |
| 1722 | |
| 677 | 1723 if (update_stats) { |
| 342 | 1724 double pause_time_ms = elapsed_ms; |
| 1725 | |
| 1726 size_t diff = 0; | |
| 1727 if (_max_pending_cards >= _pending_cards) | |
| 1728 diff = _max_pending_cards - _pending_cards; | |
| 1729 _pending_card_diff_seq->add((double) diff); | |
| 1730 | |
| 1731 double cost_per_card_ms = 0.0; | |
| 1732 if (_pending_cards > 0) { | |
| 1733 cost_per_card_ms = update_rs_time / (double) _pending_cards; | |
| 1734 _cost_per_card_ms_seq->add(cost_per_card_ms); | |
| 1735 } | |
| 1736 | |
| 1737 double cost_per_scan_only_region_ms = 0.0; | |
| 1738 if (scan_only_regions_scanned > 0.0) { | |
| 1739 cost_per_scan_only_region_ms = | |
| 1740 scan_only_time / scan_only_regions_scanned; | |
| 1741 if (_in_marking_window_im) | |
| 1742 _cost_per_scan_only_region_ms_during_cm_seq->add(cost_per_scan_only_region_ms); | |
| 1743 else | |
| 1744 _cost_per_scan_only_region_ms_seq->add(cost_per_scan_only_region_ms); | |
| 1745 } | |
| 1746 | |
| 1747 size_t cards_scanned = _g1->cards_scanned(); | |
| 1748 | |
| 1749 double cost_per_entry_ms = 0.0; | |
| 1750 if (cards_scanned > 10) { | |
| 1751 cost_per_entry_ms = scan_rs_time / (double) cards_scanned; | |
| 1752 if (_last_young_gc_full) | |
| 1753 _cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
| 1754 else | |
| 1755 _partially_young_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
| 1756 } | |
| 1757 | |
| 1758 if (_max_rs_lengths > 0) { | |
| 1759 double cards_per_entry_ratio = | |
| 1760 (double) cards_scanned / (double) _max_rs_lengths; | |
| 1761 if (_last_young_gc_full) | |
| 1762 _fully_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
| 1763 else | |
| 1764 _partially_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
| 1765 } | |
| 1766 | |
| 1767 size_t rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; | |
| 1768 if (rs_length_diff >= 0) | |
| 1769 _rs_length_diff_seq->add((double) rs_length_diff); | |
| 1770 | |
| 1771 size_t copied_bytes = surviving_bytes; | |
| 1772 double cost_per_byte_ms = 0.0; | |
| 1773 if (copied_bytes > 0) { | |
| 1774 cost_per_byte_ms = obj_copy_time / (double) copied_bytes; | |
| 1775 if (_in_marking_window) | |
| 1776 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); | |
| 1777 else | |
| 1778 _cost_per_byte_ms_seq->add(cost_per_byte_ms); | |
| 1779 } | |
| 1780 | |
| 1781 double all_other_time_ms = pause_time_ms - | |
| 1782 (update_rs_time + scan_only_time + scan_rs_time + obj_copy_time + | |
| 1783 _mark_closure_time_ms + termination_time); | |
| 1784 | |
| 1785 double young_other_time_ms = 0.0; | |
| 1786 if (_recorded_young_regions > 0) { | |
| 1787 young_other_time_ms = | |
| 1788 _recorded_young_cset_choice_time_ms + | |
| 1789 _recorded_young_free_cset_time_ms; | |
| 1790 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / | |
| 1791 (double) _recorded_young_regions); | |
| 1792 } | |
| 1793 double non_young_other_time_ms = 0.0; | |
| 1794 if (_recorded_non_young_regions > 0) { | |
| 1795 non_young_other_time_ms = | |
| 1796 _recorded_non_young_cset_choice_time_ms + | |
| 1797 _recorded_non_young_free_cset_time_ms; | |
| 1798 | |
| 1799 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
| 1800 (double) _recorded_non_young_regions); | |
| 1801 } | |
| 1802 | |
| 1803 double constant_other_time_ms = all_other_time_ms - | |
| 1804 (young_other_time_ms + non_young_other_time_ms); | |
| 1805 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
| 1806 | |
| 1807 double survival_ratio = 0.0; | |
| 1808 if (_bytes_in_collection_set_before_gc > 0) { | |
| 1809 survival_ratio = (double) bytes_in_to_space_during_gc() / | |
| 1810 (double) _bytes_in_collection_set_before_gc; | |
| 1811 } | |
| 1812 | |
| 1813 _pending_cards_seq->add((double) _pending_cards); | |
| 1814 _scanned_cards_seq->add((double) cards_scanned); | |
| 1815 _rs_lengths_seq->add((double) _max_rs_lengths); | |
| 1816 | |
| 1817 double expensive_region_limit_ms = | |
| 751 | 1818 (double) MaxGCPauseMillis - predict_constant_other_time_ms(); |
| 342 | 1819 if (expensive_region_limit_ms < 0.0) { |
| 1820 // this means that the other time was predicted to be longer than | |
| 1821 // than the max pause time | |
| 751 | 1822 expensive_region_limit_ms = (double) MaxGCPauseMillis; |
| 342 | 1823 } |
| 1824 _expensive_region_limit_ms = expensive_region_limit_ms; | |
| 1825 | |
| 1826 if (PREDICTIONS_VERBOSE) { | |
| 1827 gclog_or_tty->print_cr(""); | |
| 1828 gclog_or_tty->print_cr("PREDICTIONS %1.4lf %d " | |
| 1829 "REGIONS %d %d %d %d " | |
| 1830 "PENDING_CARDS %d %d " | |
| 1831 "CARDS_SCANNED %d %d " | |
| 1832 "RS_LENGTHS %d %d " | |
| 1833 "SCAN_ONLY_SCAN %1.6lf %1.6lf " | |
| 1834 "RS_UPDATE %1.6lf %1.6lf RS_SCAN %1.6lf %1.6lf " | |
| 1835 "SURVIVAL_RATIO %1.6lf %1.6lf " | |
| 1836 "OBJECT_COPY %1.6lf %1.6lf OTHER_CONSTANT %1.6lf %1.6lf " | |
| 1837 "OTHER_YOUNG %1.6lf %1.6lf " | |
| 1838 "OTHER_NON_YOUNG %1.6lf %1.6lf " | |
| 1839 "VTIME_DIFF %1.6lf TERMINATION %1.6lf " | |
| 1840 "ELAPSED %1.6lf %1.6lf ", | |
| 1841 _cur_collection_start_sec, | |
| 1842 (!_last_young_gc_full) ? 2 : | |
| 1843 (last_pause_included_initial_mark) ? 1 : 0, | |
| 1844 _recorded_region_num, | |
| 1845 _recorded_young_regions, | |
| 1846 _recorded_scan_only_regions, | |
| 1847 _recorded_non_young_regions, | |
| 1848 _predicted_pending_cards, _pending_cards, | |
| 1849 _predicted_cards_scanned, cards_scanned, | |
| 1850 _predicted_rs_lengths, _max_rs_lengths, | |
| 1851 _predicted_scan_only_scan_time_ms, scan_only_time, | |
| 1852 _predicted_rs_update_time_ms, update_rs_time, | |
| 1853 _predicted_rs_scan_time_ms, scan_rs_time, | |
| 1854 _predicted_survival_ratio, survival_ratio, | |
| 1855 _predicted_object_copy_time_ms, obj_copy_time, | |
| 1856 _predicted_constant_other_time_ms, constant_other_time_ms, | |
| 1857 _predicted_young_other_time_ms, young_other_time_ms, | |
| 1858 _predicted_non_young_other_time_ms, | |
| 1859 non_young_other_time_ms, | |
| 1860 _vtime_diff_ms, termination_time, | |
| 1861 _predicted_pause_time_ms, elapsed_ms); | |
| 1862 } | |
| 1863 | |
| 1864 if (G1PolicyVerbose > 0) { | |
| 1865 gclog_or_tty->print_cr("Pause Time, predicted: %1.4lfms (predicted %s), actual: %1.4lfms", | |
| 1866 _predicted_pause_time_ms, | |
| 1867 (_within_target) ? "within" : "outside", | |
| 1868 elapsed_ms); | |
| 1869 } | |
| 1870 | |
| 1871 } | |
| 1872 | |
| 1873 _in_marking_window = new_in_marking_window; | |
| 1874 _in_marking_window_im = new_in_marking_window_im; | |
| 1875 _free_regions_at_end_of_collection = _g1->free_regions(); | |
| 1876 _scan_only_regions_at_end_of_collection = _g1->young_list_length(); | |
| 1877 calculate_young_list_min_length(); | |
| 1878 calculate_young_list_target_config(); | |
| 1879 | |
| 1880 // </NEW PREDICTION> | |
| 1881 | |
| 1882 _target_pause_time_ms = -1.0; | |
| 1883 } | |
| 1884 | |
| 1885 // <NEW PREDICTION> | |
| 1886 | |
| 1887 double | |
| 1888 G1CollectorPolicy:: | |
| 1889 predict_young_collection_elapsed_time_ms(size_t adjustment) { | |
| 1890 guarantee( adjustment == 0 || adjustment == 1, "invariant" ); | |
| 1891 | |
| 1892 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 1893 size_t young_num = g1h->young_list_length(); | |
| 1894 if (young_num == 0) | |
| 1895 return 0.0; | |
| 1896 | |
| 1897 young_num += adjustment; | |
| 1898 size_t pending_cards = predict_pending_cards(); | |
| 1899 size_t rs_lengths = g1h->young_list_sampled_rs_lengths() + | |
| 1900 predict_rs_length_diff(); | |
| 1901 size_t card_num; | |
| 1902 if (full_young_gcs()) | |
| 1903 card_num = predict_young_card_num(rs_lengths); | |
| 1904 else | |
| 1905 card_num = predict_non_young_card_num(rs_lengths); | |
| 1906 size_t young_byte_size = young_num * HeapRegion::GrainBytes; | |
| 1907 double accum_yg_surv_rate = | |
| 1908 _short_lived_surv_rate_group->accum_surv_rate(adjustment); | |
| 1909 | |
| 1910 size_t bytes_to_copy = | |
| 1911 (size_t) (accum_yg_surv_rate * (double) HeapRegion::GrainBytes); | |
| 1912 | |
| 1913 return | |
| 1914 predict_rs_update_time_ms(pending_cards) + | |
| 1915 predict_rs_scan_time_ms(card_num) + | |
| 1916 predict_object_copy_time_ms(bytes_to_copy) + | |
| 1917 predict_young_other_time_ms(young_num) + | |
| 1918 predict_constant_other_time_ms(); | |
| 1919 } | |
| 1920 | |
| 1921 double | |
| 1922 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { | |
| 1923 size_t rs_length = predict_rs_length_diff(); | |
| 1924 size_t card_num; | |
| 1925 if (full_young_gcs()) | |
| 1926 card_num = predict_young_card_num(rs_length); | |
| 1927 else | |
| 1928 card_num = predict_non_young_card_num(rs_length); | |
| 1929 return predict_base_elapsed_time_ms(pending_cards, card_num); | |
| 1930 } | |
| 1931 | |
| 1932 double | |
| 1933 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
| 1934 size_t scanned_cards) { | |
| 1935 return | |
| 1936 predict_rs_update_time_ms(pending_cards) + | |
| 1937 predict_rs_scan_time_ms(scanned_cards) + | |
| 1938 predict_constant_other_time_ms(); | |
| 1939 } | |
| 1940 | |
| 1941 double | |
| 1942 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
| 1943 bool young) { | |
| 1944 size_t rs_length = hr->rem_set()->occupied(); | |
| 1945 size_t card_num; | |
| 1946 if (full_young_gcs()) | |
| 1947 card_num = predict_young_card_num(rs_length); | |
| 1948 else | |
| 1949 card_num = predict_non_young_card_num(rs_length); | |
| 1950 size_t bytes_to_copy = predict_bytes_to_copy(hr); | |
| 1951 | |
| 1952 double region_elapsed_time_ms = | |
| 1953 predict_rs_scan_time_ms(card_num) + | |
| 1954 predict_object_copy_time_ms(bytes_to_copy); | |
| 1955 | |
| 1956 if (young) | |
| 1957 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
| 1958 else | |
| 1959 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
| 1960 | |
| 1961 return region_elapsed_time_ms; | |
| 1962 } | |
| 1963 | |
| 1964 size_t | |
| 1965 G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { | |
| 1966 size_t bytes_to_copy; | |
| 1967 if (hr->is_marked()) | |
| 1968 bytes_to_copy = hr->max_live_bytes(); | |
| 1969 else { | |
| 1970 guarantee( hr->is_young() && hr->age_in_surv_rate_group() != -1, | |
| 1971 "invariant" ); | |
| 1972 int age = hr->age_in_surv_rate_group(); | |
| 545 | 1973 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
| 342 | 1974 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
| 1975 } | |
| 1976 | |
| 1977 return bytes_to_copy; | |
| 1978 } | |
| 1979 | |
| 1980 void | |
| 1981 G1CollectorPolicy::start_recording_regions() { | |
| 1982 _recorded_rs_lengths = 0; | |
| 1983 _recorded_scan_only_regions = 0; | |
| 1984 _recorded_young_regions = 0; | |
| 1985 _recorded_non_young_regions = 0; | |
| 1986 | |
| 1987 #if PREDICTIONS_VERBOSE | |
| 1988 _predicted_rs_lengths = 0; | |
| 1989 _predicted_cards_scanned = 0; | |
| 1990 | |
| 1991 _recorded_marked_bytes = 0; | |
| 1992 _recorded_young_bytes = 0; | |
| 1993 _predicted_bytes_to_copy = 0; | |
| 1994 #endif // PREDICTIONS_VERBOSE | |
| 1995 } | |
| 1996 | |
| 1997 void | |
| 1998 G1CollectorPolicy::record_cset_region(HeapRegion* hr, bool young) { | |
| 1999 if (young) { | |
| 2000 ++_recorded_young_regions; | |
| 2001 } else { | |
| 2002 ++_recorded_non_young_regions; | |
| 2003 } | |
| 2004 #if PREDICTIONS_VERBOSE | |
| 2005 if (young) { | |
| 545 | 2006 _recorded_young_bytes += hr->used(); |
| 342 | 2007 } else { |
| 2008 _recorded_marked_bytes += hr->max_live_bytes(); | |
| 2009 } | |
| 2010 _predicted_bytes_to_copy += predict_bytes_to_copy(hr); | |
| 2011 #endif // PREDICTIONS_VERBOSE | |
| 2012 | |
| 2013 size_t rs_length = hr->rem_set()->occupied(); | |
| 2014 _recorded_rs_lengths += rs_length; | |
| 2015 } | |
| 2016 | |
| 2017 void | |
| 2018 G1CollectorPolicy::record_scan_only_regions(size_t scan_only_length) { | |
| 2019 _recorded_scan_only_regions = scan_only_length; | |
| 2020 } | |
| 2021 | |
| 2022 void | |
| 2023 G1CollectorPolicy::end_recording_regions() { | |
| 2024 #if PREDICTIONS_VERBOSE | |
| 2025 _predicted_pending_cards = predict_pending_cards(); | |
| 2026 _predicted_rs_lengths = _recorded_rs_lengths + predict_rs_length_diff(); | |
| 2027 if (full_young_gcs()) | |
| 2028 _predicted_cards_scanned += predict_young_card_num(_predicted_rs_lengths); | |
| 2029 else | |
| 2030 _predicted_cards_scanned += | |
| 2031 predict_non_young_card_num(_predicted_rs_lengths); | |
| 2032 _recorded_region_num = _recorded_young_regions + _recorded_non_young_regions; | |
| 2033 | |
| 2034 _predicted_scan_only_scan_time_ms = | |
| 2035 predict_scan_only_time_ms(_recorded_scan_only_regions); | |
| 2036 _predicted_rs_update_time_ms = | |
| 2037 predict_rs_update_time_ms(_g1->pending_card_num()); | |
| 2038 _predicted_rs_scan_time_ms = | |
| 2039 predict_rs_scan_time_ms(_predicted_cards_scanned); | |
| 2040 _predicted_object_copy_time_ms = | |
| 2041 predict_object_copy_time_ms(_predicted_bytes_to_copy); | |
| 2042 _predicted_constant_other_time_ms = | |
| 2043 predict_constant_other_time_ms(); | |
| 2044 _predicted_young_other_time_ms = | |
| 2045 predict_young_other_time_ms(_recorded_young_regions); | |
| 2046 _predicted_non_young_other_time_ms = | |
| 2047 predict_non_young_other_time_ms(_recorded_non_young_regions); | |
| 2048 | |
| 2049 _predicted_pause_time_ms = | |
| 2050 _predicted_scan_only_scan_time_ms + | |
| 2051 _predicted_rs_update_time_ms + | |
| 2052 _predicted_rs_scan_time_ms + | |
| 2053 _predicted_object_copy_time_ms + | |
| 2054 _predicted_constant_other_time_ms + | |
| 2055 _predicted_young_other_time_ms + | |
| 2056 _predicted_non_young_other_time_ms; | |
| 2057 #endif // PREDICTIONS_VERBOSE | |
| 2058 } | |
| 2059 | |
| 2060 void G1CollectorPolicy::check_if_region_is_too_expensive(double | |
| 2061 predicted_time_ms) { | |
| 2062 // I don't think we need to do this when in young GC mode since | |
| 2063 // marking will be initiated next time we hit the soft limit anyway... | |
| 2064 if (predicted_time_ms > _expensive_region_limit_ms) { | |
| 2065 if (!in_young_gc_mode()) { | |
| 2066 set_full_young_gcs(true); | |
| 2067 _should_initiate_conc_mark = true; | |
| 2068 } else | |
| 2069 // no point in doing another partial one | |
| 2070 _should_revert_to_full_young_gcs = true; | |
| 2071 } | |
| 2072 } | |
| 2073 | |
| 2074 // </NEW PREDICTION> | |
| 2075 | |
| 2076 | |
| 2077 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, | |
| 2078 double elapsed_ms) { | |
| 2079 _recent_gc_times_ms->add(elapsed_ms); | |
| 2080 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
| 2081 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
| 2082 } | |
| 2083 | |
| 2084 double G1CollectorPolicy::recent_avg_time_for_pauses_ms() { | |
| 751 | 2085 if (_recent_pause_times_ms->num() == 0) return (double) MaxGCPauseMillis; |
| 342 | 2086 else return _recent_pause_times_ms->avg(); |
| 2087 } | |
| 2088 | |
| 2089 double G1CollectorPolicy::recent_avg_time_for_CH_strong_ms() { | |
| 2090 if (_recent_CH_strong_roots_times_ms->num() == 0) | |
| 751 | 2091 return (double)MaxGCPauseMillis/3.0; |
| 342 | 2092 else return _recent_CH_strong_roots_times_ms->avg(); |
| 2093 } | |
| 2094 | |
| 2095 double G1CollectorPolicy::recent_avg_time_for_G1_strong_ms() { | |
| 2096 if (_recent_G1_strong_roots_times_ms->num() == 0) | |
| 751 | 2097 return (double)MaxGCPauseMillis/3.0; |
| 342 | 2098 else return _recent_G1_strong_roots_times_ms->avg(); |
| 2099 } | |
| 2100 | |
| 2101 double G1CollectorPolicy::recent_avg_time_for_evac_ms() { | |
| 751 | 2102 if (_recent_evac_times_ms->num() == 0) return (double)MaxGCPauseMillis/3.0; |
| 342 | 2103 else return _recent_evac_times_ms->avg(); |
| 2104 } | |
| 2105 | |
| 2106 int G1CollectorPolicy::number_of_recent_gcs() { | |
| 2107 assert(_recent_CH_strong_roots_times_ms->num() == | |
| 2108 _recent_G1_strong_roots_times_ms->num(), "Sequence out of sync"); | |
| 2109 assert(_recent_G1_strong_roots_times_ms->num() == | |
| 2110 _recent_evac_times_ms->num(), "Sequence out of sync"); | |
| 2111 assert(_recent_evac_times_ms->num() == | |
| 2112 _recent_pause_times_ms->num(), "Sequence out of sync"); | |
| 2113 assert(_recent_pause_times_ms->num() == | |
| 2114 _recent_CS_bytes_used_before->num(), "Sequence out of sync"); | |
| 2115 assert(_recent_CS_bytes_used_before->num() == | |
| 2116 _recent_CS_bytes_surviving->num(), "Sequence out of sync"); | |
| 2117 return _recent_pause_times_ms->num(); | |
| 2118 } | |
| 2119 | |
| 2120 double G1CollectorPolicy::recent_avg_survival_fraction() { | |
| 2121 return recent_avg_survival_fraction_work(_recent_CS_bytes_surviving, | |
| 2122 _recent_CS_bytes_used_before); | |
| 2123 } | |
| 2124 | |
| 2125 double G1CollectorPolicy::last_survival_fraction() { | |
| 2126 return last_survival_fraction_work(_recent_CS_bytes_surviving, | |
| 2127 _recent_CS_bytes_used_before); | |
| 2128 } | |
| 2129 | |
| 2130 double | |
| 2131 G1CollectorPolicy::recent_avg_survival_fraction_work(TruncatedSeq* surviving, | |
| 2132 TruncatedSeq* before) { | |
| 2133 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
| 2134 if (before->sum() > 0.0) { | |
| 2135 double recent_survival_rate = surviving->sum() / before->sum(); | |
| 2136 // We exempt parallel collection from this check because Alloc Buffer | |
| 2137 // fragmentation can produce negative collections. | |
| 2138 // Further, we're now always doing parallel collection. But I'm still | |
| 2139 // leaving this here as a placeholder for a more precise assertion later. | |
| 2140 // (DLD, 10/05.) | |
| 2141 assert((true || ParallelGCThreads > 0) || | |
| 2142 _g1->evacuation_failed() || | |
| 2143 recent_survival_rate <= 1.0, "Or bad frac"); | |
| 2144 return recent_survival_rate; | |
| 2145 } else { | |
| 2146 return 1.0; // Be conservative. | |
| 2147 } | |
| 2148 } | |
| 2149 | |
| 2150 double | |
| 2151 G1CollectorPolicy::last_survival_fraction_work(TruncatedSeq* surviving, | |
| 2152 TruncatedSeq* before) { | |
| 2153 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
| 2154 if (surviving->num() > 0 && before->last() > 0.0) { | |
| 2155 double last_survival_rate = surviving->last() / before->last(); | |
| 2156 // We exempt parallel collection from this check because Alloc Buffer | |
| 2157 // fragmentation can produce negative collections. | |
| 2158 // Further, we're now always doing parallel collection. But I'm still | |
| 2159 // leaving this here as a placeholder for a more precise assertion later. | |
| 2160 // (DLD, 10/05.) | |
| 2161 assert((true || ParallelGCThreads > 0) || | |
| 2162 last_survival_rate <= 1.0, "Or bad frac"); | |
| 2163 return last_survival_rate; | |
| 2164 } else { | |
| 2165 return 1.0; | |
| 2166 } | |
| 2167 } | |
| 2168 | |
| 2169 static const int survival_min_obs = 5; | |
| 2170 static double survival_min_obs_limits[] = { 0.9, 0.7, 0.5, 0.3, 0.1 }; | |
| 2171 static const double min_survival_rate = 0.1; | |
| 2172 | |
| 2173 double | |
| 2174 G1CollectorPolicy::conservative_avg_survival_fraction_work(double avg, | |
| 2175 double latest) { | |
| 2176 double res = avg; | |
| 2177 if (number_of_recent_gcs() < survival_min_obs) { | |
| 2178 res = MAX2(res, survival_min_obs_limits[number_of_recent_gcs()]); | |
| 2179 } | |
| 2180 res = MAX2(res, latest); | |
| 2181 res = MAX2(res, min_survival_rate); | |
| 2182 // In the parallel case, LAB fragmentation can produce "negative | |
| 2183 // collections"; so can evac failure. Cap at 1.0 | |
| 2184 res = MIN2(res, 1.0); | |
| 2185 return res; | |
| 2186 } | |
| 2187 | |
| 2188 size_t G1CollectorPolicy::expansion_amount() { | |
| 751 | 2189 if ((int)(recent_avg_pause_time_ratio() * 100.0) > G1GCPercent) { |
| 2190 // We will double the existing space, or take | |
| 2191 // G1ExpandByPercentOfAvailable % of the available expansion | |
| 2192 // space, whichever is smaller, bounded below by a minimum | |
| 2193 // expansion (unless that's all that's left.) | |
| 342 | 2194 const size_t min_expand_bytes = 1*M; |
| 2195 size_t reserved_bytes = _g1->g1_reserved_obj_bytes(); | |
| 2196 size_t committed_bytes = _g1->capacity(); | |
| 2197 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
| 2198 size_t expand_bytes; | |
| 2199 size_t expand_bytes_via_pct = | |
| 751 | 2200 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
| 342 | 2201 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
| 2202 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
| 2203 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
| 2204 if (G1PolicyVerbose > 1) { | |
| 2205 gclog_or_tty->print("Decided to expand: ratio = %5.2f, " | |
| 2206 "committed = %d%s, uncommited = %d%s, via pct = %d%s.\n" | |
| 2207 " Answer = %d.\n", | |
| 2208 recent_avg_pause_time_ratio(), | |
| 2209 byte_size_in_proper_unit(committed_bytes), | |
| 2210 proper_unit_for_byte_size(committed_bytes), | |
| 2211 byte_size_in_proper_unit(uncommitted_bytes), | |
| 2212 proper_unit_for_byte_size(uncommitted_bytes), | |
| 2213 byte_size_in_proper_unit(expand_bytes_via_pct), | |
| 2214 proper_unit_for_byte_size(expand_bytes_via_pct), | |
| 2215 byte_size_in_proper_unit(expand_bytes), | |
| 2216 proper_unit_for_byte_size(expand_bytes)); | |
| 2217 } | |
| 2218 return expand_bytes; | |
| 2219 } else { | |
| 2220 return 0; | |
| 2221 } | |
| 2222 } | |
| 2223 | |
| 2224 void G1CollectorPolicy::note_start_of_mark_thread() { | |
| 2225 _mark_thread_startup_sec = os::elapsedTime(); | |
| 2226 } | |
| 2227 | |
| 2228 class CountCSClosure: public HeapRegionClosure { | |
| 2229 G1CollectorPolicy* _g1_policy; | |
| 2230 public: | |
| 2231 CountCSClosure(G1CollectorPolicy* g1_policy) : | |
| 2232 _g1_policy(g1_policy) {} | |
| 2233 bool doHeapRegion(HeapRegion* r) { | |
| 2234 _g1_policy->_bytes_in_collection_set_before_gc += r->used(); | |
| 2235 return false; | |
| 2236 } | |
| 2237 }; | |
| 2238 | |
| 2239 void G1CollectorPolicy::count_CS_bytes_used() { | |
| 2240 CountCSClosure cs_closure(this); | |
| 2241 _g1->collection_set_iterate(&cs_closure); | |
| 2242 } | |
| 2243 | |
| 2244 static void print_indent(int level) { | |
| 2245 for (int j = 0; j < level+1; ++j) | |
| 2246 gclog_or_tty->print(" "); | |
| 2247 } | |
| 2248 | |
| 2249 void G1CollectorPolicy::print_summary (int level, | |
| 2250 const char* str, | |
| 2251 NumberSeq* seq) const { | |
| 2252 double sum = seq->sum(); | |
| 2253 print_indent(level); | |
| 2254 gclog_or_tty->print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", | |
| 2255 str, sum / 1000.0, seq->avg()); | |
| 2256 } | |
| 2257 | |
| 2258 void G1CollectorPolicy::print_summary_sd (int level, | |
| 2259 const char* str, | |
| 2260 NumberSeq* seq) const { | |
| 2261 print_summary(level, str, seq); | |
| 2262 print_indent(level + 5); | |
| 2263 gclog_or_tty->print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", | |
| 2264 seq->num(), seq->sd(), seq->maximum()); | |
| 2265 } | |
| 2266 | |
| 2267 void G1CollectorPolicy::check_other_times(int level, | |
| 2268 NumberSeq* other_times_ms, | |
| 2269 NumberSeq* calc_other_times_ms) const { | |
| 2270 bool should_print = false; | |
| 2271 | |
| 2272 double max_sum = MAX2(fabs(other_times_ms->sum()), | |
| 2273 fabs(calc_other_times_ms->sum())); | |
| 2274 double min_sum = MIN2(fabs(other_times_ms->sum()), | |
| 2275 fabs(calc_other_times_ms->sum())); | |
| 2276 double sum_ratio = max_sum / min_sum; | |
| 2277 if (sum_ratio > 1.1) { | |
| 2278 should_print = true; | |
| 2279 print_indent(level + 1); | |
| 2280 gclog_or_tty->print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); | |
| 2281 } | |
| 2282 | |
| 2283 double max_avg = MAX2(fabs(other_times_ms->avg()), | |
| 2284 fabs(calc_other_times_ms->avg())); | |
| 2285 double min_avg = MIN2(fabs(other_times_ms->avg()), | |
| 2286 fabs(calc_other_times_ms->avg())); | |
| 2287 double avg_ratio = max_avg / min_avg; | |
| 2288 if (avg_ratio > 1.1) { | |
| 2289 should_print = true; | |
| 2290 print_indent(level + 1); | |
| 2291 gclog_or_tty->print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); | |
| 2292 } | |
| 2293 | |
| 2294 if (other_times_ms->sum() < -0.01) { | |
| 2295 print_indent(level + 1); | |
| 2296 gclog_or_tty->print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); | |
| 2297 } | |
| 2298 | |
| 2299 if (other_times_ms->avg() < -0.01) { | |
| 2300 print_indent(level + 1); | |
| 2301 gclog_or_tty->print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); | |
| 2302 } | |
| 2303 | |
| 2304 if (calc_other_times_ms->sum() < -0.01) { | |
| 2305 should_print = true; | |
| 2306 print_indent(level + 1); | |
| 2307 gclog_or_tty->print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); | |
| 2308 } | |
| 2309 | |
| 2310 if (calc_other_times_ms->avg() < -0.01) { | |
| 2311 should_print = true; | |
| 2312 print_indent(level + 1); | |
| 2313 gclog_or_tty->print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); | |
| 2314 } | |
| 2315 | |
| 2316 if (should_print) | |
| 2317 print_summary(level, "Other(Calc)", calc_other_times_ms); | |
| 2318 } | |
| 2319 | |
| 2320 void G1CollectorPolicy::print_summary(PauseSummary* summary) const { | |
| 2321 bool parallel = ParallelGCThreads > 0; | |
| 2322 MainBodySummary* body_summary = summary->main_body_summary(); | |
| 2323 if (summary->get_total_seq()->num() > 0) { | |
| 677 | 2324 print_summary_sd(0, "Evacuation Pauses", summary->get_total_seq()); |
| 342 | 2325 if (body_summary != NULL) { |
| 2326 print_summary(1, "SATB Drain", body_summary->get_satb_drain_seq()); | |
| 2327 if (parallel) { | |
| 2328 print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); | |
| 2329 print_summary(2, "Update RS", body_summary->get_update_rs_seq()); | |
| 2330 print_summary(2, "Ext Root Scanning", | |
| 2331 body_summary->get_ext_root_scan_seq()); | |
| 2332 print_summary(2, "Mark Stack Scanning", | |
| 2333 body_summary->get_mark_stack_scan_seq()); | |
| 2334 print_summary(2, "Scan-Only Scanning", | |
| 2335 body_summary->get_scan_only_seq()); | |
| 2336 print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); | |
| 2337 print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); | |
| 2338 print_summary(2, "Termination", body_summary->get_termination_seq()); | |
| 2339 print_summary(2, "Other", body_summary->get_parallel_other_seq()); | |
| 2340 { | |
| 2341 NumberSeq* other_parts[] = { | |
| 2342 body_summary->get_update_rs_seq(), | |
| 2343 body_summary->get_ext_root_scan_seq(), | |
| 2344 body_summary->get_mark_stack_scan_seq(), | |
| 2345 body_summary->get_scan_only_seq(), | |
| 2346 body_summary->get_scan_rs_seq(), | |
| 2347 body_summary->get_obj_copy_seq(), | |
| 2348 body_summary->get_termination_seq() | |
| 2349 }; | |
| 2350 NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), | |
| 2351 7, other_parts); | |
| 2352 check_other_times(2, body_summary->get_parallel_other_seq(), | |
| 2353 &calc_other_times_ms); | |
| 2354 } | |
| 2355 print_summary(1, "Mark Closure", body_summary->get_mark_closure_seq()); | |
| 2356 print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); | |
| 2357 } else { | |
| 2358 print_summary(1, "Update RS", body_summary->get_update_rs_seq()); | |
| 2359 print_summary(1, "Ext Root Scanning", | |
| 2360 body_summary->get_ext_root_scan_seq()); | |
| 2361 print_summary(1, "Mark Stack Scanning", | |
| 2362 body_summary->get_mark_stack_scan_seq()); | |
| 2363 print_summary(1, "Scan-Only Scanning", | |
| 2364 body_summary->get_scan_only_seq()); | |
| 2365 print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); | |
| 2366 print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); | |
| 2367 } | |
| 2368 } | |
| 2369 print_summary(1, "Other", summary->get_other_seq()); | |
| 2370 { | |
| 2371 NumberSeq calc_other_times_ms; | |
| 2372 if (body_summary != NULL) { | |
| 2373 // not abandoned | |
| 2374 if (parallel) { | |
| 2375 // parallel | |
| 2376 NumberSeq* other_parts[] = { | |
| 2377 body_summary->get_satb_drain_seq(), | |
| 2378 body_summary->get_parallel_seq(), | |
| 2379 body_summary->get_clear_ct_seq() | |
| 2380 }; | |
| 677 | 2381 calc_other_times_ms = NumberSeq(summary->get_total_seq(), |
| 2382 3, other_parts); | |
| 342 | 2383 } else { |
| 2384 // serial | |
| 2385 NumberSeq* other_parts[] = { | |
| 2386 body_summary->get_satb_drain_seq(), | |
| 2387 body_summary->get_update_rs_seq(), | |
| 2388 body_summary->get_ext_root_scan_seq(), | |
| 2389 body_summary->get_mark_stack_scan_seq(), | |
| 2390 body_summary->get_scan_only_seq(), | |
| 2391 body_summary->get_scan_rs_seq(), | |
| 2392 body_summary->get_obj_copy_seq() | |
| 2393 }; | |
| 2394 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
| 677 | 2395 7, other_parts); |
| 342 | 2396 } |
| 2397 } else { | |
| 2398 // abandoned | |
| 677 | 2399 calc_other_times_ms = NumberSeq(); |
| 342 | 2400 } |
| 2401 check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); | |
| 2402 } | |
| 2403 } else { | |
| 2404 print_indent(0); | |
| 2405 gclog_or_tty->print_cr("none"); | |
| 2406 } | |
| 2407 gclog_or_tty->print_cr(""); | |
| 2408 } | |
| 2409 | |
| 2410 void | |
| 677 | 2411 G1CollectorPolicy::print_abandoned_summary(PauseSummary* summary) const { |
| 342 | 2412 bool printed = false; |
| 677 | 2413 if (summary->get_total_seq()->num() > 0) { |
| 342 | 2414 printed = true; |
| 677 | 2415 print_summary(summary); |
| 342 | 2416 } |
| 2417 if (!printed) { | |
| 2418 print_indent(0); | |
| 2419 gclog_or_tty->print_cr("none"); | |
| 2420 gclog_or_tty->print_cr(""); | |
| 2421 } | |
| 2422 } | |
| 2423 | |
| 2424 void G1CollectorPolicy::print_tracing_info() const { | |
| 2425 if (TraceGen0Time) { | |
| 2426 gclog_or_tty->print_cr("ALL PAUSES"); | |
| 2427 print_summary_sd(0, "Total", _all_pause_times_ms); | |
| 2428 gclog_or_tty->print_cr(""); | |
| 2429 gclog_or_tty->print_cr(""); | |
| 2430 gclog_or_tty->print_cr(" Full Young GC Pauses: %8d", _full_young_pause_num); | |
| 2431 gclog_or_tty->print_cr(" Partial Young GC Pauses: %8d", _partial_young_pause_num); | |
| 2432 gclog_or_tty->print_cr(""); | |
| 2433 | |
| 677 | 2434 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
| 2435 print_summary(_summary); | |
| 342 | 2436 |
| 2437 gclog_or_tty->print_cr("ABANDONED PAUSES"); | |
| 677 | 2438 print_abandoned_summary(_abandoned_summary); |
| 342 | 2439 |
| 2440 gclog_or_tty->print_cr("MISC"); | |
| 2441 print_summary_sd(0, "Stop World", _all_stop_world_times_ms); | |
| 2442 print_summary_sd(0, "Yields", _all_yield_times_ms); | |
| 2443 for (int i = 0; i < _aux_num; ++i) { | |
| 2444 if (_all_aux_times_ms[i].num() > 0) { | |
| 2445 char buffer[96]; | |
| 2446 sprintf(buffer, "Aux%d", i); | |
| 2447 print_summary_sd(0, buffer, &_all_aux_times_ms[i]); | |
| 2448 } | |
| 2449 } | |
| 2450 | |
| 2451 size_t all_region_num = _region_num_young + _region_num_tenured; | |
| 2452 gclog_or_tty->print_cr(" New Regions %8d, Young %8d (%6.2lf%%), " | |
| 2453 "Tenured %8d (%6.2lf%%)", | |
| 2454 all_region_num, | |
| 2455 _region_num_young, | |
| 2456 (double) _region_num_young / (double) all_region_num * 100.0, | |
| 2457 _region_num_tenured, | |
| 2458 (double) _region_num_tenured / (double) all_region_num * 100.0); | |
| 2459 } | |
| 2460 if (TraceGen1Time) { | |
| 2461 if (_all_full_gc_times_ms->num() > 0) { | |
| 2462 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", | |
| 2463 _all_full_gc_times_ms->num(), | |
| 2464 _all_full_gc_times_ms->sum() / 1000.0); | |
| 2465 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); | |
| 2466 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", | |
| 2467 _all_full_gc_times_ms->sd(), | |
| 2468 _all_full_gc_times_ms->maximum()); | |
| 2469 } | |
| 2470 } | |
| 2471 } | |
| 2472 | |
| 2473 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
| 2474 #ifndef PRODUCT | |
| 2475 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
| 2476 // add this call for any other surv rate groups | |
| 2477 #endif // PRODUCT | |
| 2478 } | |
| 2479 | |
| 2480 bool | |
| 2481 G1CollectorPolicy::should_add_next_region_to_young_list() { | |
| 2482 assert(in_young_gc_mode(), "should be in young GC mode"); | |
| 2483 bool ret; | |
| 2484 size_t young_list_length = _g1->young_list_length(); | |
| 545 | 2485 size_t young_list_max_length = _young_list_target_length; |
| 2486 if (G1FixedEdenSize) { | |
| 2487 young_list_max_length -= _max_survivor_regions; | |
| 2488 } | |
| 2489 if (young_list_length < young_list_max_length) { | |
| 342 | 2490 ret = true; |
| 2491 ++_region_num_young; | |
| 2492 } else { | |
| 2493 ret = false; | |
| 2494 ++_region_num_tenured; | |
| 2495 } | |
| 2496 | |
| 2497 return ret; | |
| 2498 } | |
| 2499 | |
| 2500 #ifndef PRODUCT | |
| 2501 // for debugging, bit of a hack... | |
| 2502 static char* | |
| 2503 region_num_to_mbs(int length) { | |
| 2504 static char buffer[64]; | |
| 2505 double bytes = (double) (length * HeapRegion::GrainBytes); | |
| 2506 double mbs = bytes / (double) (1024 * 1024); | |
| 2507 sprintf(buffer, "%7.2lfMB", mbs); | |
| 2508 return buffer; | |
| 2509 } | |
| 2510 #endif // PRODUCT | |
| 2511 | |
| 2512 void | |
| 2513 G1CollectorPolicy::checkpoint_conc_overhead() { | |
| 2514 double conc_overhead = 0.0; | |
| 2515 if (G1AccountConcurrentOverhead) | |
| 2516 conc_overhead = COTracker::totalPredConcOverhead(); | |
| 2517 _mmu_tracker->update_conc_overhead(conc_overhead); | |
| 2518 #if 0 | |
| 2519 gclog_or_tty->print(" CO %1.4lf TARGET %1.4lf", | |
| 2520 conc_overhead, _mmu_tracker->max_gc_time()); | |
| 2521 #endif | |
| 2522 } | |
| 2523 | |
| 2524 | |
| 545 | 2525 size_t G1CollectorPolicy::max_regions(int purpose) { |
| 342 | 2526 switch (purpose) { |
| 2527 case GCAllocForSurvived: | |
| 545 | 2528 return _max_survivor_regions; |
| 342 | 2529 case GCAllocForTenured: |
| 545 | 2530 return REGIONS_UNLIMITED; |
| 342 | 2531 default: |
| 545 | 2532 ShouldNotReachHere(); |
| 2533 return REGIONS_UNLIMITED; | |
| 342 | 2534 }; |
| 2535 } | |
| 2536 | |
| 545 | 2537 // Calculates survivor space parameters. |
| 2538 void G1CollectorPolicy::calculate_survivors_policy() | |
| 2539 { | |
| 751 | 2540 if (!G1UseSurvivorSpaces) { |
| 545 | 2541 return; |
| 2542 } | |
| 2543 if (G1FixedSurvivorSpaceSize == 0) { | |
| 2544 _max_survivor_regions = _young_list_target_length / SurvivorRatio; | |
| 2545 } else { | |
|
547
1e458753107d
6802413: G1: G1FixedSurvivorSpaceSize should be converted into regions in calculate_survivors_policy()
apetrusenko
parents:
545
diff
changeset
|
2546 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
| 545 | 2547 } |
| 2548 | |
| 2549 if (G1FixedTenuringThreshold) { | |
| 2550 _tenuring_threshold = MaxTenuringThreshold; | |
| 2551 } else { | |
| 2552 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( | |
| 2553 HeapRegion::GrainWords * _max_survivor_regions); | |
| 2554 } | |
| 2555 } | |
| 2556 | |
| 342 | 2557 bool |
| 2558 G1CollectorPolicy_BestRegionsFirst::should_do_collection_pause(size_t | |
| 2559 word_size) { | |
| 2560 assert(_g1->regions_accounted_for(), "Region leakage!"); | |
| 2561 // Initiate a pause when we reach the steady-state "used" target. | |
| 2562 size_t used_hard = (_g1->capacity() / 100) * G1SteadyStateUsed; | |
| 2563 size_t used_soft = | |
| 2564 MAX2((_g1->capacity() / 100) * (G1SteadyStateUsed - G1SteadyStateUsedDelta), | |
| 2565 used_hard/2); | |
| 2566 size_t used = _g1->used(); | |
| 2567 | |
| 2568 double max_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; | |
| 2569 | |
| 2570 size_t young_list_length = _g1->young_list_length(); | |
| 545 | 2571 size_t young_list_max_length = _young_list_target_length; |
| 2572 if (G1FixedEdenSize) { | |
| 2573 young_list_max_length -= _max_survivor_regions; | |
| 2574 } | |
| 2575 bool reached_target_length = young_list_length >= young_list_max_length; | |
| 342 | 2576 |
| 2577 if (in_young_gc_mode()) { | |
| 2578 if (reached_target_length) { | |
| 2579 assert( young_list_length > 0 && _g1->young_list_length() > 0, | |
| 2580 "invariant" ); | |
| 2581 _target_pause_time_ms = max_pause_time_ms; | |
| 2582 return true; | |
| 2583 } | |
| 2584 } else { | |
| 2585 guarantee( false, "should not reach here" ); | |
| 2586 } | |
| 2587 | |
| 2588 return false; | |
| 2589 } | |
| 2590 | |
| 2591 #ifndef PRODUCT | |
| 2592 class HRSortIndexIsOKClosure: public HeapRegionClosure { | |
| 2593 CollectionSetChooser* _chooser; | |
| 2594 public: | |
| 2595 HRSortIndexIsOKClosure(CollectionSetChooser* chooser) : | |
| 2596 _chooser(chooser) {} | |
| 2597 | |
| 2598 bool doHeapRegion(HeapRegion* r) { | |
| 2599 if (!r->continuesHumongous()) { | |
| 2600 assert(_chooser->regionProperlyOrdered(r), "Ought to be."); | |
| 2601 } | |
| 2602 return false; | |
| 2603 } | |
| 2604 }; | |
| 2605 | |
| 2606 bool G1CollectorPolicy_BestRegionsFirst::assertMarkedBytesDataOK() { | |
| 2607 HRSortIndexIsOKClosure cl(_collectionSetChooser); | |
| 2608 _g1->heap_region_iterate(&cl); | |
| 2609 return true; | |
| 2610 } | |
| 2611 #endif | |
| 2612 | |
| 2613 void | |
| 2614 G1CollectorPolicy_BestRegionsFirst:: | |
| 2615 record_collection_pause_start(double start_time_sec, size_t start_used) { | |
| 2616 G1CollectorPolicy::record_collection_pause_start(start_time_sec, start_used); | |
| 2617 } | |
| 2618 | |
| 2619 class NextNonCSElemFinder: public HeapRegionClosure { | |
| 2620 HeapRegion* _res; | |
| 2621 public: | |
| 2622 NextNonCSElemFinder(): _res(NULL) {} | |
| 2623 bool doHeapRegion(HeapRegion* r) { | |
| 2624 if (!r->in_collection_set()) { | |
| 2625 _res = r; | |
| 2626 return true; | |
| 2627 } else { | |
| 2628 return false; | |
| 2629 } | |
| 2630 } | |
| 2631 HeapRegion* res() { return _res; } | |
| 2632 }; | |
| 2633 | |
| 2634 class KnownGarbageClosure: public HeapRegionClosure { | |
| 2635 CollectionSetChooser* _hrSorted; | |
| 2636 | |
| 2637 public: | |
| 2638 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
| 2639 _hrSorted(hrSorted) | |
| 2640 {} | |
| 2641 | |
| 2642 bool doHeapRegion(HeapRegion* r) { | |
| 2643 // We only include humongous regions in collection | |
| 2644 // sets when concurrent mark shows that their contained object is | |
| 2645 // unreachable. | |
| 2646 | |
| 2647 // Do we have any marking information for this region? | |
| 2648 if (r->is_marked()) { | |
| 2649 // We don't include humongous regions in collection | |
| 2650 // sets because we collect them immediately at the end of a marking | |
| 2651 // cycle. We also don't include young regions because we *must* | |
| 2652 // include them in the next collection pause. | |
| 2653 if (!r->isHumongous() && !r->is_young()) { | |
| 2654 _hrSorted->addMarkedHeapRegion(r); | |
| 2655 } | |
| 2656 } | |
| 2657 return false; | |
| 2658 } | |
| 2659 }; | |
| 2660 | |
| 2661 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
| 2662 CollectionSetChooser* _hrSorted; | |
| 2663 jint _marked_regions_added; | |
| 2664 jint _chunk_size; | |
| 2665 jint _cur_chunk_idx; | |
| 2666 jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) | |
| 2667 int _worker; | |
| 2668 int _invokes; | |
| 2669 | |
| 2670 void get_new_chunk() { | |
| 2671 _cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size); | |
| 2672 _cur_chunk_end = _cur_chunk_idx + _chunk_size; | |
| 2673 } | |
| 2674 void add_region(HeapRegion* r) { | |
| 2675 if (_cur_chunk_idx == _cur_chunk_end) { | |
| 2676 get_new_chunk(); | |
| 2677 } | |
| 2678 assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); | |
| 2679 _hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r); | |
| 2680 _marked_regions_added++; | |
| 2681 _cur_chunk_idx++; | |
| 2682 } | |
| 2683 | |
| 2684 public: | |
| 2685 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
| 2686 jint chunk_size, | |
| 2687 int worker) : | |
| 2688 _hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker), | |
| 2689 _marked_regions_added(0), _cur_chunk_idx(0), _cur_chunk_end(0), | |
| 2690 _invokes(0) | |
| 2691 {} | |
| 2692 | |
| 2693 bool doHeapRegion(HeapRegion* r) { | |
| 2694 // We only include humongous regions in collection | |
| 2695 // sets when concurrent mark shows that their contained object is | |
| 2696 // unreachable. | |
| 2697 _invokes++; | |
| 2698 | |
| 2699 // Do we have any marking information for this region? | |
| 2700 if (r->is_marked()) { | |
| 2701 // We don't include humongous regions in collection | |
| 2702 // sets because we collect them immediately at the end of a marking | |
| 2703 // cycle. | |
| 2704 // We also do not include young regions in collection sets | |
| 2705 if (!r->isHumongous() && !r->is_young()) { | |
| 2706 add_region(r); | |
| 2707 } | |
| 2708 } | |
| 2709 return false; | |
| 2710 } | |
| 2711 jint marked_regions_added() { return _marked_regions_added; } | |
| 2712 int invokes() { return _invokes; } | |
| 2713 }; | |
| 2714 | |
| 2715 class ParKnownGarbageTask: public AbstractGangTask { | |
| 2716 CollectionSetChooser* _hrSorted; | |
| 2717 jint _chunk_size; | |
| 2718 G1CollectedHeap* _g1; | |
| 2719 public: | |
| 2720 ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) : | |
| 2721 AbstractGangTask("ParKnownGarbageTask"), | |
| 2722 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
| 2723 _g1(G1CollectedHeap::heap()) | |
| 2724 {} | |
| 2725 | |
| 2726 void work(int i) { | |
| 2727 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size, i); | |
| 2728 // Back to zero for the claim value. | |
| 355 | 2729 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, i, |
| 2730 HeapRegion::InitialClaimValue); | |
| 342 | 2731 jint regions_added = parKnownGarbageCl.marked_regions_added(); |
| 2732 _hrSorted->incNumMarkedHeapRegions(regions_added); | |
| 2733 if (G1PrintParCleanupStats) { | |
| 2734 gclog_or_tty->print(" Thread %d called %d times, added %d regions to list.\n", | |
| 2735 i, parKnownGarbageCl.invokes(), regions_added); | |
| 2736 } | |
| 2737 } | |
| 2738 }; | |
| 2739 | |
| 2740 void | |
| 2741 G1CollectorPolicy_BestRegionsFirst:: | |
| 2742 record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
| 2743 size_t max_live_bytes) { | |
| 2744 double start; | |
| 2745 if (G1PrintParCleanupStats) start = os::elapsedTime(); | |
| 2746 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
| 2747 | |
| 2748 _collectionSetChooser->clearMarkedHeapRegions(); | |
| 2749 double clear_marked_end; | |
| 2750 if (G1PrintParCleanupStats) { | |
| 2751 clear_marked_end = os::elapsedTime(); | |
| 2752 gclog_or_tty->print_cr(" clear marked regions + work1: %8.3f ms.", | |
| 2753 (clear_marked_end - start)*1000.0); | |
| 2754 } | |
| 2755 if (ParallelGCThreads > 0) { | |
| 2756 const size_t OverpartitionFactor = 4; | |
| 2757 const size_t MinChunkSize = 8; | |
| 2758 const size_t ChunkSize = | |
| 2759 MAX2(_g1->n_regions() / (ParallelGCThreads * OverpartitionFactor), | |
| 2760 MinChunkSize); | |
| 2761 _collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(), | |
| 2762 ChunkSize); | |
| 2763 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, | |
| 2764 (int) ChunkSize); | |
| 2765 _g1->workers()->run_task(&parKnownGarbageTask); | |
| 355 | 2766 |
| 2767 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 2768 "sanity check"); | |
| 342 | 2769 } else { |
| 2770 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
| 2771 _g1->heap_region_iterate(&knownGarbagecl); | |
| 2772 } | |
| 2773 double known_garbage_end; | |
| 2774 if (G1PrintParCleanupStats) { | |
| 2775 known_garbage_end = os::elapsedTime(); | |
| 2776 gclog_or_tty->print_cr(" compute known garbage: %8.3f ms.", | |
| 2777 (known_garbage_end - clear_marked_end)*1000.0); | |
| 2778 } | |
| 2779 _collectionSetChooser->sortMarkedHeapRegions(); | |
| 2780 double sort_end; | |
| 2781 if (G1PrintParCleanupStats) { | |
| 2782 sort_end = os::elapsedTime(); | |
| 2783 gclog_or_tty->print_cr(" sorting: %8.3f ms.", | |
| 2784 (sort_end - known_garbage_end)*1000.0); | |
| 2785 } | |
| 2786 | |
| 2787 record_concurrent_mark_cleanup_end_work2(); | |
| 2788 double work2_end; | |
| 2789 if (G1PrintParCleanupStats) { | |
| 2790 work2_end = os::elapsedTime(); | |
| 2791 gclog_or_tty->print_cr(" work2: %8.3f ms.", | |
| 2792 (work2_end - sort_end)*1000.0); | |
| 2793 } | |
| 2794 } | |
| 2795 | |
| 2796 // Add the heap region to the collection set and return the conservative | |
| 2797 // estimate of the number of live bytes. | |
| 2798 void G1CollectorPolicy:: | |
| 2799 add_to_collection_set(HeapRegion* hr) { | |
| 751 | 2800 if (G1PrintRegions) { |
| 342 | 2801 gclog_or_tty->print_cr("added region to cset %d:["PTR_FORMAT", "PTR_FORMAT"], " |
| 2802 "top "PTR_FORMAT", young %s", | |
| 2803 hr->hrs_index(), hr->bottom(), hr->end(), | |
| 2804 hr->top(), (hr->is_young()) ? "YES" : "NO"); | |
| 2805 } | |
| 2806 | |
| 2807 if (_g1->mark_in_progress()) | |
| 2808 _g1->concurrent_mark()->registerCSetRegion(hr); | |
| 2809 | |
| 2810 assert(!hr->in_collection_set(), | |
| 2811 "should not already be in the CSet"); | |
| 2812 hr->set_in_collection_set(true); | |
| 2813 hr->set_next_in_collection_set(_collection_set); | |
| 2814 _collection_set = hr; | |
| 2815 _collection_set_size++; | |
| 2816 _collection_set_bytes_used_before += hr->used(); | |
| 526 | 2817 _g1->register_region_with_in_cset_fast_test(hr); |
| 342 | 2818 } |
| 2819 | |
| 2820 void | |
| 2821 G1CollectorPolicy_BestRegionsFirst:: | |
| 677 | 2822 choose_collection_set() { |
| 342 | 2823 double non_young_start_time_sec; |
| 2824 start_recording_regions(); | |
| 2825 | |
| 677 | 2826 guarantee(_target_pause_time_ms > -1.0, |
| 2827 "_target_pause_time_ms should have been set!"); | |
| 2828 assert(_collection_set == NULL, "Precondition"); | |
| 342 | 2829 |
| 2830 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
| 2831 double predicted_pause_time_ms = base_time_ms; | |
| 2832 | |
| 2833 double target_time_ms = _target_pause_time_ms; | |
| 2834 double time_remaining_ms = target_time_ms - base_time_ms; | |
| 2835 | |
| 2836 // the 10% and 50% values are arbitrary... | |
| 2837 if (time_remaining_ms < 0.10*target_time_ms) { | |
| 2838 time_remaining_ms = 0.50 * target_time_ms; | |
| 2839 _within_target = false; | |
| 2840 } else { | |
| 2841 _within_target = true; | |
| 2842 } | |
| 2843 | |
| 2844 // We figure out the number of bytes available for future to-space. | |
| 2845 // For new regions without marking information, we must assume the | |
| 2846 // worst-case of complete survival. If we have marking information for a | |
| 2847 // region, we can bound the amount of live data. We can add a number of | |
| 2848 // such regions, as long as the sum of the live data bounds does not | |
| 2849 // exceed the available evacuation space. | |
| 2850 size_t max_live_bytes = _g1->free_regions() * HeapRegion::GrainBytes; | |
| 2851 | |
| 2852 size_t expansion_bytes = | |
| 2853 _g1->expansion_regions() * HeapRegion::GrainBytes; | |
| 2854 | |
| 677 | 2855 _collection_set_bytes_used_before = 0; |
| 2856 _collection_set_size = 0; | |
| 342 | 2857 |
| 2858 // Adjust for expansion and slop. | |
| 2859 max_live_bytes = max_live_bytes + expansion_bytes; | |
| 2860 | |
| 677 | 2861 assert(_g1->regions_accounted_for(), "Region leakage!"); |
| 342 | 2862 |
| 2863 HeapRegion* hr; | |
| 2864 if (in_young_gc_mode()) { | |
| 2865 double young_start_time_sec = os::elapsedTime(); | |
| 2866 | |
| 2867 if (G1PolicyVerbose > 0) { | |
| 2868 gclog_or_tty->print_cr("Adding %d young regions to the CSet", | |
| 2869 _g1->young_list_length()); | |
| 2870 } | |
| 2871 _young_cset_length = 0; | |
| 2872 _last_young_gc_full = full_young_gcs() ? true : false; | |
| 2873 if (_last_young_gc_full) | |
| 2874 ++_full_young_pause_num; | |
| 2875 else | |
| 2876 ++_partial_young_pause_num; | |
| 2877 hr = _g1->pop_region_from_young_list(); | |
| 2878 while (hr != NULL) { | |
| 2879 | |
| 2880 assert( hr->young_index_in_cset() == -1, "invariant" ); | |
| 2881 assert( hr->age_in_surv_rate_group() != -1, "invariant" ); | |
| 2882 hr->set_young_index_in_cset((int) _young_cset_length); | |
| 2883 | |
| 2884 ++_young_cset_length; | |
| 2885 double predicted_time_ms = predict_region_elapsed_time_ms(hr, true); | |
| 2886 time_remaining_ms -= predicted_time_ms; | |
| 2887 predicted_pause_time_ms += predicted_time_ms; | |
| 677 | 2888 assert(!hr->in_collection_set(), "invariant"); |
| 2889 add_to_collection_set(hr); | |
| 2890 record_cset_region(hr, true); | |
| 342 | 2891 max_live_bytes -= MIN2(hr->max_live_bytes(), max_live_bytes); |
| 2892 if (G1PolicyVerbose > 0) { | |
| 2893 gclog_or_tty->print_cr(" Added [" PTR_FORMAT ", " PTR_FORMAT") to CS.", | |
| 2894 hr->bottom(), hr->end()); | |
| 2895 gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", | |
| 2896 max_live_bytes/K); | |
| 2897 } | |
| 2898 hr = _g1->pop_region_from_young_list(); | |
| 2899 } | |
| 2900 | |
| 2901 record_scan_only_regions(_g1->young_list_scan_only_length()); | |
| 2902 | |
| 2903 double young_end_time_sec = os::elapsedTime(); | |
| 2904 _recorded_young_cset_choice_time_ms = | |
| 2905 (young_end_time_sec - young_start_time_sec) * 1000.0; | |
| 2906 | |
| 2907 non_young_start_time_sec = os::elapsedTime(); | |
| 2908 | |
| 2909 if (_young_cset_length > 0 && _last_young_gc_full) { | |
| 2910 // don't bother adding more regions... | |
| 2911 goto choose_collection_set_end; | |
| 2912 } | |
| 2913 } | |
| 2914 | |
| 2915 if (!in_young_gc_mode() || !full_young_gcs()) { | |
| 2916 bool should_continue = true; | |
| 2917 NumberSeq seq; | |
| 2918 double avg_prediction = 100000000000000000.0; // something very large | |
| 2919 do { | |
| 2920 hr = _collectionSetChooser->getNextMarkedRegion(time_remaining_ms, | |
| 2921 avg_prediction); | |
| 677 | 2922 if (hr != NULL) { |
| 342 | 2923 double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
| 2924 time_remaining_ms -= predicted_time_ms; | |
| 2925 predicted_pause_time_ms += predicted_time_ms; | |
| 2926 add_to_collection_set(hr); | |
| 2927 record_cset_region(hr, false); | |
| 2928 max_live_bytes -= MIN2(hr->max_live_bytes(), max_live_bytes); | |
| 2929 if (G1PolicyVerbose > 0) { | |
| 2930 gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", | |
| 2931 max_live_bytes/K); | |
| 2932 } | |
| 2933 seq.add(predicted_time_ms); | |
| 2934 avg_prediction = seq.avg() + seq.sd(); | |
| 2935 } | |
| 2936 should_continue = | |
| 2937 ( hr != NULL) && | |
| 2938 ( (adaptive_young_list_length()) ? time_remaining_ms > 0.0 | |
| 2939 : _collection_set_size < _young_list_fixed_length ); | |
| 2940 } while (should_continue); | |
| 2941 | |
| 2942 if (!adaptive_young_list_length() && | |
| 2943 _collection_set_size < _young_list_fixed_length) | |
| 2944 _should_revert_to_full_young_gcs = true; | |
| 2945 } | |
| 2946 | |
| 2947 choose_collection_set_end: | |
| 2948 count_CS_bytes_used(); | |
| 2949 | |
| 2950 end_recording_regions(); | |
| 2951 | |
| 2952 double non_young_end_time_sec = os::elapsedTime(); | |
| 2953 _recorded_non_young_cset_choice_time_ms = | |
| 2954 (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; | |
| 2955 } | |
| 2956 | |
| 2957 void G1CollectorPolicy_BestRegionsFirst::record_full_collection_end() { | |
| 2958 G1CollectorPolicy::record_full_collection_end(); | |
| 2959 _collectionSetChooser->updateAfterFullCollection(); | |
| 2960 } | |
| 2961 | |
| 2962 void G1CollectorPolicy_BestRegionsFirst:: | |
| 2963 expand_if_possible(size_t numRegions) { | |
| 2964 size_t expansion_bytes = numRegions * HeapRegion::GrainBytes; | |
| 2965 _g1->expand(expansion_bytes); | |
| 2966 } | |
| 2967 | |
| 2968 void G1CollectorPolicy_BestRegionsFirst:: | |
| 677 | 2969 record_collection_pause_end(bool abandoned) { |
| 2970 G1CollectorPolicy::record_collection_pause_end(abandoned); | |
| 342 | 2971 assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end."); |
| 2972 } | |
| 2973 | |
| 2974 // Local Variables: *** | |
| 2975 // c-indentation-style: gnu *** | |
| 2976 // End: *** |