Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 1391:79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
Summary: Replaces the G1-specific parameter with the existing ones that are used by the other GCs (YoungPLABSize and OldPLABSize)
Reviewed-by: tonyp, johnc
| author | apetrusenko |
|---|---|
| date | Fri, 16 Apr 2010 08:48:16 -0700 |
| parents | 7666957bc44d |
| children | 1316cec51b4d |
| 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 |
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97 #ifndef PRODUCT |
| 342 | 98 _cur_clear_ct_time_ms(0.0), |
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99 _min_clear_cc_time_ms(-1.0), |
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100 _max_clear_cc_time_ms(-1.0), |
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101 _cur_clear_cc_time_ms(0.0), |
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102 _cum_clear_cc_time_ms(0.0), |
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103 _num_cc_clears(0L), |
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104 #endif |
| 342 | 105 |
| 106 _region_num_young(0), | |
| 107 _region_num_tenured(0), | |
| 108 _prev_region_num_young(0), | |
| 109 _prev_region_num_tenured(0), | |
| 110 | |
| 111 _aux_num(10), | |
| 112 _all_aux_times_ms(new NumberSeq[_aux_num]), | |
| 113 _cur_aux_start_times_ms(new double[_aux_num]), | |
| 114 _cur_aux_times_ms(new double[_aux_num]), | |
| 115 _cur_aux_times_set(new bool[_aux_num]), | |
| 116 | |
| 117 _concurrent_mark_init_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 118 _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 119 _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 120 | |
| 121 // <NEW PREDICTION> | |
| 122 | |
| 123 _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 124 _prev_collection_pause_end_ms(0.0), | |
| 125 _pending_card_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 126 _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 127 _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 128 _cost_per_scan_only_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 129 _fully_young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 130 _partially_young_cards_per_entry_ratio_seq( | |
| 131 new TruncatedSeq(TruncatedSeqLength)), | |
| 132 _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 133 _partially_young_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 134 _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 135 _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 136 _cost_per_scan_only_region_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 137 _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 138 _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 139 _non_young_other_cost_per_region_ms_seq( | |
| 140 new TruncatedSeq(TruncatedSeqLength)), | |
| 141 | |
| 142 _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 143 _scanned_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 144 _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 145 | |
| 751 | 146 _pause_time_target_ms((double) MaxGCPauseMillis), |
| 342 | 147 |
| 148 // </NEW PREDICTION> | |
| 149 | |
| 150 _in_young_gc_mode(false), | |
| 151 _full_young_gcs(true), | |
| 152 _full_young_pause_num(0), | |
| 153 _partial_young_pause_num(0), | |
| 154 | |
| 155 _during_marking(false), | |
| 156 _in_marking_window(false), | |
| 157 _in_marking_window_im(false), | |
| 158 | |
| 159 _known_garbage_ratio(0.0), | |
| 160 _known_garbage_bytes(0), | |
| 161 | |
| 162 _young_gc_eff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 163 _target_pause_time_ms(-1.0), | |
| 164 | |
| 165 _recent_prev_end_times_for_all_gcs_sec(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 166 | |
| 167 _recent_CS_bytes_used_before(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 168 _recent_CS_bytes_surviving(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 169 | |
| 170 _recent_avg_pause_time_ratio(0.0), | |
| 171 _num_markings(0), | |
| 172 _n_marks(0), | |
| 173 _n_pauses_at_mark_end(0), | |
| 174 | |
| 175 _all_full_gc_times_ms(new NumberSeq()), | |
| 176 | |
| 177 // G1PausesBtwnConcMark defaults to -1 | |
| 178 // so the hack is to do the cast QQQ FIXME | |
| 179 _pauses_btwn_concurrent_mark((size_t)G1PausesBtwnConcMark), | |
| 180 _n_marks_since_last_pause(0), | |
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181 _initiate_conc_mark_if_possible(false), |
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182 _during_initial_mark_pause(false), |
| 342 | 183 _should_revert_to_full_young_gcs(false), |
| 184 _last_full_young_gc(false), | |
| 185 | |
| 186 _prev_collection_pause_used_at_end_bytes(0), | |
| 187 | |
| 188 _collection_set(NULL), | |
| 189 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 190 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 191 #endif // _MSC_VER | |
| 192 | |
| 193 _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", | |
| 194 G1YoungSurvRateNumRegionsSummary)), | |
| 195 _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", | |
| 545 | 196 G1YoungSurvRateNumRegionsSummary)), |
| 342 | 197 // add here any more surv rate groups |
| 545 | 198 _recorded_survivor_regions(0), |
| 199 _recorded_survivor_head(NULL), | |
| 200 _recorded_survivor_tail(NULL), | |
| 1356 | 201 _survivors_age_table(true), |
| 202 | |
| 203 _gc_overhead_perc(0.0) | |
| 545 | 204 |
| 342 | 205 { |
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206 // Set up the region size and associated fields. Given that the |
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207 // policy is created before the heap, we have to set this up here, |
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208 // so it's done as soon as possible. |
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209 HeapRegion::setup_heap_region_size(Arguments::min_heap_size()); |
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210 HeapRegionRemSet::setup_remset_size(); |
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211 |
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212 // Verify PLAB sizes |
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213 const uint region_size = HeapRegion::GrainWords; |
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214 if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
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215 char buffer[128]; |
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216 jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most %u", |
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217 OldPLABSize > region_size ? "Old" : "Young", region_size); |
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218 vm_exit_during_initialization(buffer); |
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219 } |
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220 |
| 342 | 221 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
| 222 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
| 223 | |
| 224 _par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads]; | |
| 225 _par_last_mark_stack_scan_times_ms = new double[_parallel_gc_threads]; | |
| 226 _par_last_scan_only_times_ms = new double[_parallel_gc_threads]; | |
| 227 _par_last_scan_only_regions_scanned = new double[_parallel_gc_threads]; | |
| 228 | |
| 229 _par_last_update_rs_start_times_ms = new double[_parallel_gc_threads]; | |
| 230 _par_last_update_rs_times_ms = new double[_parallel_gc_threads]; | |
| 231 _par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; | |
| 232 | |
| 233 _par_last_scan_rs_start_times_ms = new double[_parallel_gc_threads]; | |
| 234 _par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; | |
| 235 _par_last_scan_new_refs_times_ms = new double[_parallel_gc_threads]; | |
| 236 | |
| 237 _par_last_obj_copy_times_ms = new double[_parallel_gc_threads]; | |
| 238 | |
| 239 _par_last_termination_times_ms = new double[_parallel_gc_threads]; | |
| 240 | |
| 241 // start conservatively | |
| 751 | 242 _expensive_region_limit_ms = 0.5 * (double) MaxGCPauseMillis; |
| 342 | 243 |
| 244 // <NEW PREDICTION> | |
| 245 | |
| 246 int index; | |
| 247 if (ParallelGCThreads == 0) | |
| 248 index = 0; | |
| 249 else if (ParallelGCThreads > 8) | |
| 250 index = 7; | |
| 251 else | |
| 252 index = ParallelGCThreads - 1; | |
| 253 | |
| 254 _pending_card_diff_seq->add(0.0); | |
| 255 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
| 256 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
| 257 _cost_per_scan_only_region_ms_seq->add( | |
| 258 cost_per_scan_only_region_ms_defaults[index]); | |
| 259 _fully_young_cards_per_entry_ratio_seq->add( | |
| 260 fully_young_cards_per_entry_ratio_defaults[index]); | |
| 261 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); | |
| 262 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
| 263 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
| 264 _young_other_cost_per_region_ms_seq->add( | |
| 265 young_other_cost_per_region_ms_defaults[index]); | |
| 266 _non_young_other_cost_per_region_ms_seq->add( | |
| 267 non_young_other_cost_per_region_ms_defaults[index]); | |
| 268 | |
| 269 // </NEW PREDICTION> | |
| 270 | |
| 751 | 271 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
| 272 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; | |
| 342 | 273 guarantee(max_gc_time < time_slice, |
| 274 "Max GC time should not be greater than the time slice"); | |
| 275 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); | |
| 751 | 276 _sigma = (double) G1ConfidencePercent / 100.0; |
| 342 | 277 |
| 278 // start conservatively (around 50ms is about right) | |
| 279 _concurrent_mark_init_times_ms->add(0.05); | |
| 280 _concurrent_mark_remark_times_ms->add(0.05); | |
| 281 _concurrent_mark_cleanup_times_ms->add(0.20); | |
| 282 _tenuring_threshold = MaxTenuringThreshold; | |
| 283 | |
| 1282 | 284 // if G1FixedSurvivorSpaceSize is 0 which means the size is not |
| 285 // fixed, then _max_survivor_regions will be calculated at | |
| 286 // calculate_young_list_target_config during initialization | |
| 287 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; | |
| 545 | 288 |
| 1356 | 289 assert(GCTimeRatio > 0, |
| 290 "we should have set it to a default value set_g1_gc_flags() " | |
| 291 "if a user set it to 0"); | |
| 292 _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); | |
| 293 | |
| 342 | 294 initialize_all(); |
| 295 } | |
| 296 | |
| 297 // Increment "i", mod "len" | |
| 298 static void inc_mod(int& i, int len) { | |
| 299 i++; if (i == len) i = 0; | |
| 300 } | |
| 301 | |
| 302 void G1CollectorPolicy::initialize_flags() { | |
| 303 set_min_alignment(HeapRegion::GrainBytes); | |
| 304 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
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305 if (SurvivorRatio < 1) { |
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306 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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307 } |
| 342 | 308 CollectorPolicy::initialize_flags(); |
| 309 } | |
| 310 | |
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311 // The easiest way to deal with the parsing of the NewSize / |
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312 // MaxNewSize / etc. parameteres is to re-use the code in the |
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313 // TwoGenerationCollectorPolicy class. This is similar to what |
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314 // ParallelScavenge does with its GenerationSizer class (see |
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315 // ParallelScavengeHeap::initialize()). We might change this in the |
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316 // future, but it's a good start. |
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317 class G1YoungGenSizer : public TwoGenerationCollectorPolicy { |
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318 size_t size_to_region_num(size_t byte_size) { |
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319 return MAX2((size_t) 1, byte_size / HeapRegion::GrainBytes); |
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320 } |
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321 |
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322 public: |
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323 G1YoungGenSizer() { |
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324 initialize_flags(); |
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325 initialize_size_info(); |
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326 } |
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327 |
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328 size_t min_young_region_num() { |
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329 return size_to_region_num(_min_gen0_size); |
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330 } |
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331 size_t initial_young_region_num() { |
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332 return size_to_region_num(_initial_gen0_size); |
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333 } |
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334 size_t max_young_region_num() { |
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335 return size_to_region_num(_max_gen0_size); |
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336 } |
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337 }; |
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338 |
| 342 | 339 void G1CollectorPolicy::init() { |
| 340 // Set aside an initial future to_space. | |
| 341 _g1 = G1CollectedHeap::heap(); | |
| 342 | |
| 343 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
| 344 | |
| 545 | 345 initialize_gc_policy_counters(); |
| 346 | |
| 342 | 347 if (G1Gen) { |
| 348 _in_young_gc_mode = true; | |
| 349 | |
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350 G1YoungGenSizer sizer; |
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351 size_t initial_region_num = sizer.initial_young_region_num(); |
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352 |
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353 if (UseAdaptiveSizePolicy) { |
| 342 | 354 set_adaptive_young_list_length(true); |
| 355 _young_list_fixed_length = 0; | |
| 356 } else { | |
| 357 set_adaptive_young_list_length(false); | |
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358 _young_list_fixed_length = initial_region_num; |
| 342 | 359 } |
| 360 _free_regions_at_end_of_collection = _g1->free_regions(); | |
| 361 _scan_only_regions_at_end_of_collection = 0; | |
| 362 calculate_young_list_min_length(); | |
| 363 guarantee( _young_list_min_length == 0, "invariant, not enough info" ); | |
| 364 calculate_young_list_target_config(); | |
| 365 } else { | |
| 366 _young_list_fixed_length = 0; | |
| 367 _in_young_gc_mode = false; | |
| 368 } | |
| 369 } | |
| 370 | |
| 545 | 371 // Create the jstat counters for the policy. |
| 372 void G1CollectorPolicy::initialize_gc_policy_counters() | |
| 373 { | |
| 374 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 2 + G1Gen); | |
| 375 } | |
| 376 | |
| 342 | 377 void G1CollectorPolicy::calculate_young_list_min_length() { |
| 378 _young_list_min_length = 0; | |
| 379 | |
| 380 if (!adaptive_young_list_length()) | |
| 381 return; | |
| 382 | |
| 383 if (_alloc_rate_ms_seq->num() > 3) { | |
| 384 double now_sec = os::elapsedTime(); | |
| 385 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; | |
| 386 double alloc_rate_ms = predict_alloc_rate_ms(); | |
| 387 int min_regions = (int) ceil(alloc_rate_ms * when_ms); | |
| 388 int current_region_num = (int) _g1->young_list_length(); | |
| 389 _young_list_min_length = min_regions + current_region_num; | |
| 390 } | |
| 391 } | |
| 392 | |
| 393 void G1CollectorPolicy::calculate_young_list_target_config() { | |
| 394 if (adaptive_young_list_length()) { | |
| 395 size_t rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); | |
| 396 calculate_young_list_target_config(rs_lengths); | |
| 397 } else { | |
| 398 if (full_young_gcs()) | |
| 399 _young_list_target_length = _young_list_fixed_length; | |
| 400 else | |
| 401 _young_list_target_length = _young_list_fixed_length / 2; | |
| 402 _young_list_target_length = MAX2(_young_list_target_length, (size_t)1); | |
| 403 size_t so_length = calculate_optimal_so_length(_young_list_target_length); | |
| 404 guarantee( so_length < _young_list_target_length, "invariant" ); | |
| 405 _young_list_so_prefix_length = so_length; | |
| 406 } | |
| 545 | 407 calculate_survivors_policy(); |
| 342 | 408 } |
| 409 | |
| 410 // This method calculate the optimal scan-only set for a fixed young | |
| 411 // gen size. I couldn't work out how to reuse the more elaborate one, | |
| 412 // i.e. calculate_young_list_target_config(rs_length), as the loops are | |
| 413 // fundamentally different (the other one finds a config for different | |
| 414 // S-O lengths, whereas here we need to do the opposite). | |
| 415 size_t G1CollectorPolicy::calculate_optimal_so_length( | |
| 416 size_t young_list_length) { | |
| 417 if (!G1UseScanOnlyPrefix) | |
| 418 return 0; | |
| 419 | |
| 420 if (_all_pause_times_ms->num() < 3) { | |
| 421 // we won't use a scan-only set at the beginning to allow the rest | |
| 422 // of the predictors to warm up | |
| 423 return 0; | |
| 424 } | |
| 425 | |
| 426 if (_cost_per_scan_only_region_ms_seq->num() < 3) { | |
| 427 // then, we'll only set the S-O set to 1 for a little bit of time, | |
| 428 // to get enough information on the scanning cost | |
| 429 return 1; | |
| 430 } | |
| 431 | |
| 432 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); | |
| 433 size_t rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); | |
| 434 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); | |
| 435 size_t scanned_cards; | |
| 436 if (full_young_gcs()) | |
| 437 scanned_cards = predict_young_card_num(adj_rs_lengths); | |
| 438 else | |
| 439 scanned_cards = predict_non_young_card_num(adj_rs_lengths); | |
| 440 double base_time_ms = predict_base_elapsed_time_ms(pending_cards, | |
| 441 scanned_cards); | |
| 442 | |
| 443 size_t so_length = 0; | |
| 444 double max_gc_eff = 0.0; | |
| 445 for (size_t i = 0; i < young_list_length; ++i) { | |
| 446 double gc_eff = 0.0; | |
| 447 double pause_time_ms = 0.0; | |
| 448 predict_gc_eff(young_list_length, i, base_time_ms, | |
| 449 &gc_eff, &pause_time_ms); | |
| 450 if (gc_eff > max_gc_eff) { | |
| 451 max_gc_eff = gc_eff; | |
| 452 so_length = i; | |
| 453 } | |
| 454 } | |
| 455 | |
| 456 // set it to 95% of the optimal to make sure we sample the "area" | |
| 457 // around the optimal length to get up-to-date survival rate data | |
| 458 return so_length * 950 / 1000; | |
| 459 } | |
| 460 | |
| 461 // This is a really cool piece of code! It finds the best | |
| 462 // target configuration (young length / scan-only prefix length) so | |
| 463 // that GC efficiency is maximized and that we also meet a pause | |
| 464 // time. It's a triple nested loop. These loops are explained below | |
| 465 // from the inside-out :-) | |
| 466 // | |
| 467 // (a) The innermost loop will try to find the optimal young length | |
| 468 // for a fixed S-O length. It uses a binary search to speed up the | |
| 469 // process. We assume that, for a fixed S-O length, as we add more | |
| 470 // young regions to the CSet, the GC efficiency will only go up (I'll | |
| 471 // skip the proof). So, using a binary search to optimize this process | |
| 472 // makes perfect sense. | |
| 473 // | |
| 474 // (b) The middle loop will fix the S-O length before calling the | |
| 475 // innermost one. It will vary it between two parameters, increasing | |
| 476 // it by a given increment. | |
| 477 // | |
| 478 // (c) The outermost loop will call the middle loop three times. | |
| 479 // (1) The first time it will explore all possible S-O length values | |
| 480 // from 0 to as large as it can get, using a coarse increment (to | |
| 481 // quickly "home in" to where the optimal seems to be). | |
| 482 // (2) The second time it will explore the values around the optimal | |
| 483 // that was found by the first iteration using a fine increment. | |
| 484 // (3) Once the optimal config has been determined by the second | |
| 485 // iteration, we'll redo the calculation, but setting the S-O length | |
| 486 // to 95% of the optimal to make sure we sample the "area" | |
| 487 // around the optimal length to get up-to-date survival rate data | |
| 488 // | |
| 489 // Termination conditions for the iterations are several: the pause | |
| 490 // time is over the limit, we do not have enough to-space, etc. | |
| 491 | |
| 492 void G1CollectorPolicy::calculate_young_list_target_config(size_t rs_lengths) { | |
| 493 guarantee( adaptive_young_list_length(), "pre-condition" ); | |
| 494 | |
| 495 double start_time_sec = os::elapsedTime(); | |
| 1282 | 496 size_t min_reserve_perc = MAX2((size_t)2, (size_t)G1ReservePercent); |
| 342 | 497 min_reserve_perc = MIN2((size_t) 50, min_reserve_perc); |
| 498 size_t reserve_regions = | |
| 499 (size_t) ((double) min_reserve_perc * (double) _g1->n_regions() / 100.0); | |
| 500 | |
| 501 if (full_young_gcs() && _free_regions_at_end_of_collection > 0) { | |
| 502 // we are in fully-young mode and there are free regions in the heap | |
| 503 | |
| 545 | 504 double survivor_regions_evac_time = |
| 505 predict_survivor_regions_evac_time(); | |
| 506 | |
| 342 | 507 size_t min_so_length = 0; |
| 508 size_t max_so_length = 0; | |
| 509 | |
| 510 if (G1UseScanOnlyPrefix) { | |
| 511 if (_all_pause_times_ms->num() < 3) { | |
| 512 // we won't use a scan-only set at the beginning to allow the rest | |
| 513 // of the predictors to warm up | |
| 514 min_so_length = 0; | |
| 515 max_so_length = 0; | |
| 516 } else if (_cost_per_scan_only_region_ms_seq->num() < 3) { | |
| 517 // then, we'll only set the S-O set to 1 for a little bit of time, | |
| 518 // to get enough information on the scanning cost | |
| 519 min_so_length = 1; | |
| 520 max_so_length = 1; | |
| 521 } else if (_in_marking_window || _last_full_young_gc) { | |
| 522 // no S-O prefix during a marking phase either, as at the end | |
| 523 // of the marking phase we'll have to use a very small young | |
| 524 // length target to fill up the rest of the CSet with | |
| 525 // non-young regions and, if we have lots of scan-only regions | |
| 526 // left-over, we will not be able to add any more non-young | |
| 527 // regions. | |
| 528 min_so_length = 0; | |
| 529 max_so_length = 0; | |
| 530 } else { | |
| 531 // this is the common case; we'll never reach the maximum, we | |
| 532 // one of the end conditions will fire well before that | |
| 533 // (hopefully!) | |
| 534 min_so_length = 0; | |
| 535 max_so_length = _free_regions_at_end_of_collection - 1; | |
| 536 } | |
| 537 } else { | |
| 538 // no S-O prefix, as the switch is not set, but we still need to | |
| 539 // do one iteration to calculate the best young target that | |
| 540 // meets the pause time; this way we reuse the same code instead | |
| 541 // of replicating it | |
| 542 min_so_length = 0; | |
| 543 max_so_length = 0; | |
| 544 } | |
| 545 | |
| 546 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; | |
| 547 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); | |
| 548 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); | |
| 549 size_t scanned_cards; | |
| 550 if (full_young_gcs()) | |
| 551 scanned_cards = predict_young_card_num(adj_rs_lengths); | |
| 552 else | |
| 553 scanned_cards = predict_non_young_card_num(adj_rs_lengths); | |
| 554 // calculate this once, so that we don't have to recalculate it in | |
| 555 // the innermost loop | |
| 545 | 556 double base_time_ms = predict_base_elapsed_time_ms(pending_cards, scanned_cards) |
| 557 + survivor_regions_evac_time; | |
| 342 | 558 // the result |
| 559 size_t final_young_length = 0; | |
| 560 size_t final_so_length = 0; | |
| 561 double final_gc_eff = 0.0; | |
| 562 // we'll also keep track of how many times we go into the inner loop | |
| 563 // this is for profiling reasons | |
| 564 size_t calculations = 0; | |
| 565 | |
| 566 // this determines which of the three iterations the outer loop is in | |
| 567 typedef enum { | |
| 568 pass_type_coarse, | |
| 569 pass_type_fine, | |
| 570 pass_type_final | |
| 571 } pass_type_t; | |
| 572 | |
| 573 // range of the outer loop's iteration | |
| 574 size_t from_so_length = min_so_length; | |
| 575 size_t to_so_length = max_so_length; | |
| 576 guarantee( from_so_length <= to_so_length, "invariant" ); | |
| 577 | |
| 578 // this will keep the S-O length that's found by the second | |
| 579 // iteration of the outer loop; we'll keep it just in case the third | |
| 580 // iteration fails to find something | |
| 581 size_t fine_so_length = 0; | |
| 582 | |
| 583 // the increment step for the coarse (first) iteration | |
| 584 size_t so_coarse_increments = 5; | |
| 585 | |
| 586 // the common case, we'll start with the coarse iteration | |
| 587 pass_type_t pass = pass_type_coarse; | |
| 588 size_t so_length_incr = so_coarse_increments; | |
| 589 | |
| 590 if (from_so_length == to_so_length) { | |
| 591 // not point in doing the coarse iteration, we'll go directly into | |
| 592 // the fine one (we essentially trying to find the optimal young | |
| 593 // length for a fixed S-O length). | |
| 594 so_length_incr = 1; | |
| 595 pass = pass_type_final; | |
| 596 } else if (to_so_length - from_so_length < 3 * so_coarse_increments) { | |
| 597 // again, the range is too short so no point in foind the coarse | |
| 598 // iteration either | |
| 599 so_length_incr = 1; | |
| 600 pass = pass_type_fine; | |
| 601 } | |
| 602 | |
| 603 bool done = false; | |
| 604 // this is the outermost loop | |
| 605 while (!done) { | |
| 545 | 606 #ifdef TRACE_CALC_YOUNG_CONFIG |
| 342 | 607 // leave this in for debugging, just in case |
| 608 gclog_or_tty->print_cr("searching between " SIZE_FORMAT " and " SIZE_FORMAT | |
| 609 ", incr " SIZE_FORMAT ", pass %s", | |
| 610 from_so_length, to_so_length, so_length_incr, | |
| 611 (pass == pass_type_coarse) ? "coarse" : | |
| 612 (pass == pass_type_fine) ? "fine" : "final"); | |
| 545 | 613 #endif // TRACE_CALC_YOUNG_CONFIG |
| 342 | 614 |
| 615 size_t so_length = from_so_length; | |
| 616 size_t init_free_regions = | |
| 617 MAX2((size_t)0, | |
| 618 _free_regions_at_end_of_collection + | |
| 619 _scan_only_regions_at_end_of_collection - reserve_regions); | |
| 620 | |
| 621 // this determines whether a configuration was found | |
| 622 bool gc_eff_set = false; | |
| 623 // this is the middle loop | |
| 624 while (so_length <= to_so_length) { | |
| 625 // base time, which excludes region-related time; again we | |
| 626 // calculate it once to avoid recalculating it in the | |
| 627 // innermost loop | |
| 628 double base_time_with_so_ms = | |
| 629 base_time_ms + predict_scan_only_time_ms(so_length); | |
| 630 // it's already over the pause target, go around | |
| 631 if (base_time_with_so_ms > target_pause_time_ms) | |
| 632 break; | |
| 633 | |
| 634 size_t starting_young_length = so_length+1; | |
| 635 | |
| 636 // we make sure that the short young length that makes sense | |
| 637 // (one more than the S-O length) is feasible | |
| 638 size_t min_young_length = starting_young_length; | |
| 639 double min_gc_eff; | |
| 640 bool min_ok; | |
| 641 ++calculations; | |
| 642 min_ok = predict_gc_eff(min_young_length, so_length, | |
| 643 base_time_with_so_ms, | |
| 644 init_free_regions, target_pause_time_ms, | |
| 645 &min_gc_eff); | |
| 646 | |
| 647 if (min_ok) { | |
| 648 // the shortest young length is indeed feasible; we'll know | |
| 649 // set up the max young length and we'll do a binary search | |
| 650 // between min_young_length and max_young_length | |
| 651 size_t max_young_length = _free_regions_at_end_of_collection - 1; | |
| 652 double max_gc_eff = 0.0; | |
| 653 bool max_ok = false; | |
| 654 | |
| 655 // the innermost loop! (finally!) | |
| 656 while (max_young_length > min_young_length) { | |
| 657 // we'll make sure that min_young_length is always at a | |
| 658 // feasible config | |
| 659 guarantee( min_ok, "invariant" ); | |
| 660 | |
| 661 ++calculations; | |
| 662 max_ok = predict_gc_eff(max_young_length, so_length, | |
| 663 base_time_with_so_ms, | |
| 664 init_free_regions, target_pause_time_ms, | |
| 665 &max_gc_eff); | |
| 666 | |
| 667 size_t diff = (max_young_length - min_young_length) / 2; | |
| 668 if (max_ok) { | |
| 669 min_young_length = max_young_length; | |
| 670 min_gc_eff = max_gc_eff; | |
| 671 min_ok = true; | |
| 672 } | |
| 673 max_young_length = min_young_length + diff; | |
| 674 } | |
| 675 | |
| 676 // the innermost loop found a config | |
| 677 guarantee( min_ok, "invariant" ); | |
| 678 if (min_gc_eff > final_gc_eff) { | |
| 679 // it's the best config so far, so we'll keep it | |
| 680 final_gc_eff = min_gc_eff; | |
| 681 final_young_length = min_young_length; | |
| 682 final_so_length = so_length; | |
| 683 gc_eff_set = true; | |
| 684 } | |
| 685 } | |
| 686 | |
| 687 // incremental the fixed S-O length and go around | |
| 688 so_length += so_length_incr; | |
| 689 } | |
| 690 | |
| 691 // this is the end of the outermost loop and we need to decide | |
| 692 // what to do during the next iteration | |
| 693 if (pass == pass_type_coarse) { | |
| 694 // we just did the coarse pass (first iteration) | |
| 695 | |
| 696 if (!gc_eff_set) | |
| 697 // we didn't find a feasible config so we'll just bail out; of | |
| 698 // course, it might be the case that we missed it; but I'd say | |
| 699 // it's a bit unlikely | |
| 700 done = true; | |
| 701 else { | |
| 702 // We did find a feasible config with optimal GC eff during | |
| 703 // the first pass. So the second pass we'll only consider the | |
| 704 // S-O lengths around that config with a fine increment. | |
| 705 | |
| 706 guarantee( so_length_incr == so_coarse_increments, "invariant" ); | |
| 707 guarantee( final_so_length >= min_so_length, "invariant" ); | |
| 708 | |
| 545 | 709 #ifdef TRACE_CALC_YOUNG_CONFIG |
| 342 | 710 // leave this in for debugging, just in case |
| 711 gclog_or_tty->print_cr(" coarse pass: SO length " SIZE_FORMAT, | |
| 712 final_so_length); | |
| 545 | 713 #endif // TRACE_CALC_YOUNG_CONFIG |
| 342 | 714 |
| 715 from_so_length = | |
| 716 (final_so_length - min_so_length > so_coarse_increments) ? | |
| 717 final_so_length - so_coarse_increments + 1 : min_so_length; | |
| 718 to_so_length = | |
| 719 (max_so_length - final_so_length > so_coarse_increments) ? | |
| 720 final_so_length + so_coarse_increments - 1 : max_so_length; | |
| 721 | |
| 722 pass = pass_type_fine; | |
| 723 so_length_incr = 1; | |
| 724 } | |
| 725 } else if (pass == pass_type_fine) { | |
| 726 // we just finished the second pass | |
| 727 | |
| 728 if (!gc_eff_set) { | |
| 729 // we didn't find a feasible config (yes, it's possible; | |
| 730 // notice that, sometimes, we go directly into the fine | |
| 731 // iteration and skip the coarse one) so we bail out | |
| 732 done = true; | |
| 733 } else { | |
| 734 // We did find a feasible config with optimal GC eff | |
| 735 guarantee( so_length_incr == 1, "invariant" ); | |
| 736 | |
| 737 if (final_so_length == 0) { | |
| 738 // The config is of an empty S-O set, so we'll just bail out | |
| 739 done = true; | |
| 740 } else { | |
| 741 // we'll go around once more, setting the S-O length to 95% | |
| 742 // of the optimal | |
| 743 size_t new_so_length = 950 * final_so_length / 1000; | |
| 744 | |
| 545 | 745 #ifdef TRACE_CALC_YOUNG_CONFIG |
| 342 | 746 // leave this in for debugging, just in case |
| 747 gclog_or_tty->print_cr(" fine pass: SO length " SIZE_FORMAT | |
| 748 ", setting it to " SIZE_FORMAT, | |
| 749 final_so_length, new_so_length); | |
| 545 | 750 #endif // TRACE_CALC_YOUNG_CONFIG |
| 342 | 751 |
| 752 from_so_length = new_so_length; | |
| 753 to_so_length = new_so_length; | |
| 754 fine_so_length = final_so_length; | |
| 755 | |
| 756 pass = pass_type_final; | |
| 757 } | |
| 758 } | |
| 759 } else if (pass == pass_type_final) { | |
| 760 // we just finished the final (third) pass | |
| 761 | |
| 762 if (!gc_eff_set) | |
| 763 // we didn't find a feasible config, so we'll just use the one | |
| 764 // we found during the second pass, which we saved | |
| 765 final_so_length = fine_so_length; | |
| 766 | |
| 767 // and we're done! | |
| 768 done = true; | |
| 769 } else { | |
| 770 guarantee( false, "should never reach here" ); | |
| 771 } | |
| 772 | |
| 773 // we now go around the outermost loop | |
| 774 } | |
| 775 | |
| 776 // we should have at least one region in the target young length | |
| 545 | 777 _young_list_target_length = |
| 778 MAX2((size_t) 1, final_young_length + _recorded_survivor_regions); | |
| 342 | 779 if (final_so_length >= final_young_length) |
| 780 // and we need to ensure that the S-O length is not greater than | |
| 781 // the target young length (this is being a bit careful) | |
| 782 final_so_length = 0; | |
| 783 _young_list_so_prefix_length = final_so_length; | |
| 784 guarantee( !_in_marking_window || !_last_full_young_gc || | |
| 785 _young_list_so_prefix_length == 0, "invariant" ); | |
| 786 | |
| 787 // let's keep an eye of how long we spend on this calculation | |
| 788 // right now, I assume that we'll print it when we need it; we | |
| 789 // should really adde it to the breakdown of a pause | |
| 790 double end_time_sec = os::elapsedTime(); | |
| 791 double elapsed_time_ms = (end_time_sec - start_time_sec) * 1000.0; | |
| 792 | |
| 545 | 793 #ifdef TRACE_CALC_YOUNG_CONFIG |
| 342 | 794 // leave this in for debugging, just in case |
| 795 gclog_or_tty->print_cr("target = %1.1lf ms, young = " SIZE_FORMAT | |
| 796 ", SO = " SIZE_FORMAT ", " | |
| 797 "elapsed %1.2lf ms, calcs: " SIZE_FORMAT " (%s%s) " | |
| 798 SIZE_FORMAT SIZE_FORMAT, | |
| 799 target_pause_time_ms, | |
| 800 _young_list_target_length - _young_list_so_prefix_length, | |
| 801 _young_list_so_prefix_length, | |
| 802 elapsed_time_ms, | |
| 803 calculations, | |
| 804 full_young_gcs() ? "full" : "partial", | |
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805 during_initial_mark_pause() ? " i-m" : "", |
| 545 | 806 _in_marking_window, |
| 807 _in_marking_window_im); | |
| 808 #endif // TRACE_CALC_YOUNG_CONFIG | |
| 342 | 809 |
| 810 if (_young_list_target_length < _young_list_min_length) { | |
| 811 // bummer; this means that, if we do a pause when the optimal | |
| 812 // config dictates, we'll violate the pause spacing target (the | |
| 813 // min length was calculate based on the application's current | |
| 814 // alloc rate); | |
| 815 | |
| 816 // so, we have to bite the bullet, and allocate the minimum | |
| 817 // number. We'll violate our target, but we just can't meet it. | |
| 818 | |
| 819 size_t so_length = 0; | |
| 820 // a note further up explains why we do not want an S-O length | |
| 821 // during marking | |
| 822 if (!_in_marking_window && !_last_full_young_gc) | |
| 823 // but we can still try to see whether we can find an optimal | |
| 824 // S-O length | |
| 825 so_length = calculate_optimal_so_length(_young_list_min_length); | |
| 826 | |
| 545 | 827 #ifdef TRACE_CALC_YOUNG_CONFIG |
| 342 | 828 // leave this in for debugging, just in case |
| 829 gclog_or_tty->print_cr("adjusted target length from " | |
| 830 SIZE_FORMAT " to " SIZE_FORMAT | |
| 831 ", SO " SIZE_FORMAT, | |
| 832 _young_list_target_length, _young_list_min_length, | |
| 833 so_length); | |
| 545 | 834 #endif // TRACE_CALC_YOUNG_CONFIG |
| 342 | 835 |
| 836 _young_list_target_length = | |
| 837 MAX2(_young_list_min_length, (size_t)1); | |
| 838 _young_list_so_prefix_length = so_length; | |
| 839 } | |
| 840 } else { | |
| 841 // we are in a partially-young mode or we've run out of regions (due | |
| 842 // to evacuation failure) | |
| 843 | |
| 545 | 844 #ifdef TRACE_CALC_YOUNG_CONFIG |
| 342 | 845 // leave this in for debugging, just in case |
| 846 gclog_or_tty->print_cr("(partial) setting target to " SIZE_FORMAT | |
| 847 ", SO " SIZE_FORMAT, | |
| 848 _young_list_min_length, 0); | |
| 545 | 849 #endif // TRACE_CALC_YOUNG_CONFIG |
| 342 | 850 |
| 851 // we'll do the pause as soon as possible and with no S-O prefix | |
| 852 // (see above for the reasons behind the latter) | |
| 853 _young_list_target_length = | |
| 854 MAX2(_young_list_min_length, (size_t) 1); | |
| 855 _young_list_so_prefix_length = 0; | |
| 856 } | |
| 857 | |
| 858 _rs_lengths_prediction = rs_lengths; | |
| 859 } | |
| 860 | |
| 861 // This is used by: calculate_optimal_so_length(length). It returns | |
| 862 // the GC eff and predicted pause time for a particular config | |
| 863 void | |
| 864 G1CollectorPolicy::predict_gc_eff(size_t young_length, | |
| 865 size_t so_length, | |
| 866 double base_time_ms, | |
| 867 double* ret_gc_eff, | |
| 868 double* ret_pause_time_ms) { | |
| 869 double so_time_ms = predict_scan_only_time_ms(so_length); | |
| 870 double accum_surv_rate_adj = 0.0; | |
| 871 if (so_length > 0) | |
| 872 accum_surv_rate_adj = accum_yg_surv_rate_pred((int)(so_length - 1)); | |
| 873 double accum_surv_rate = | |
| 874 accum_yg_surv_rate_pred((int)(young_length - 1)) - accum_surv_rate_adj; | |
| 875 size_t bytes_to_copy = | |
| 876 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); | |
| 877 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); | |
| 878 double young_other_time_ms = | |
| 879 predict_young_other_time_ms(young_length - so_length); | |
| 880 double pause_time_ms = | |
| 881 base_time_ms + so_time_ms + copy_time_ms + young_other_time_ms; | |
| 882 size_t reclaimed_bytes = | |
| 883 (young_length - so_length) * HeapRegion::GrainBytes - bytes_to_copy; | |
| 884 double gc_eff = (double) reclaimed_bytes / pause_time_ms; | |
| 885 | |
| 886 *ret_gc_eff = gc_eff; | |
| 887 *ret_pause_time_ms = pause_time_ms; | |
| 888 } | |
| 889 | |
| 890 // This is used by: calculate_young_list_target_config(rs_length). It | |
| 891 // returns the GC eff of a particular config. It returns false if that | |
| 892 // config violates any of the end conditions of the search in the | |
| 893 // calling method, or true upon success. The end conditions were put | |
| 894 // here since it's called twice and it was best not to replicate them | |
| 895 // in the caller. Also, passing the parameteres avoids having to | |
| 896 // recalculate them in the innermost loop. | |
| 897 bool | |
| 898 G1CollectorPolicy::predict_gc_eff(size_t young_length, | |
| 899 size_t so_length, | |
| 900 double base_time_with_so_ms, | |
| 901 size_t init_free_regions, | |
| 902 double target_pause_time_ms, | |
| 903 double* ret_gc_eff) { | |
| 904 *ret_gc_eff = 0.0; | |
| 905 | |
| 906 if (young_length >= init_free_regions) | |
| 907 // end condition 1: not enough space for the young regions | |
| 908 return false; | |
| 909 | |
| 910 double accum_surv_rate_adj = 0.0; | |
| 911 if (so_length > 0) | |
| 912 accum_surv_rate_adj = accum_yg_surv_rate_pred((int)(so_length - 1)); | |
| 913 double accum_surv_rate = | |
| 914 accum_yg_surv_rate_pred((int)(young_length - 1)) - accum_surv_rate_adj; | |
| 915 size_t bytes_to_copy = | |
| 916 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); | |
| 917 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); | |
| 918 double young_other_time_ms = | |
| 919 predict_young_other_time_ms(young_length - so_length); | |
| 920 double pause_time_ms = | |
| 921 base_time_with_so_ms + copy_time_ms + young_other_time_ms; | |
| 922 | |
| 923 if (pause_time_ms > target_pause_time_ms) | |
| 924 // end condition 2: over the target pause time | |
| 925 return false; | |
| 926 | |
| 927 size_t reclaimed_bytes = | |
| 928 (young_length - so_length) * HeapRegion::GrainBytes - bytes_to_copy; | |
| 929 size_t free_bytes = | |
| 930 (init_free_regions - young_length) * HeapRegion::GrainBytes; | |
| 931 | |
| 932 if ((2.0 + sigma()) * (double) bytes_to_copy > (double) free_bytes) | |
| 933 // end condition 3: out of to-space (conservatively) | |
| 934 return false; | |
| 935 | |
| 936 // success! | |
| 937 double gc_eff = (double) reclaimed_bytes / pause_time_ms; | |
| 938 *ret_gc_eff = gc_eff; | |
| 939 | |
| 940 return true; | |
| 941 } | |
| 942 | |
| 545 | 943 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
| 944 double survivor_regions_evac_time = 0.0; | |
| 945 for (HeapRegion * r = _recorded_survivor_head; | |
| 946 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
| 947 r = r->get_next_young_region()) { | |
| 948 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); | |
| 949 } | |
| 950 return survivor_regions_evac_time; | |
| 951 } | |
| 952 | |
| 342 | 953 void G1CollectorPolicy::check_prediction_validity() { |
| 954 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); | |
| 955 | |
| 956 size_t rs_lengths = _g1->young_list_sampled_rs_lengths(); | |
| 957 if (rs_lengths > _rs_lengths_prediction) { | |
| 958 // add 10% to avoid having to recalculate often | |
| 959 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
| 960 calculate_young_list_target_config(rs_lengths_prediction); | |
| 961 } | |
| 962 } | |
| 963 | |
| 964 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, | |
| 965 bool is_tlab, | |
| 966 bool* gc_overhead_limit_was_exceeded) { | |
| 967 guarantee(false, "Not using this policy feature yet."); | |
| 968 return NULL; | |
| 969 } | |
| 970 | |
| 971 // This method controls how a collector handles one or more | |
| 972 // of its generations being fully allocated. | |
| 973 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
| 974 bool is_tlab) { | |
| 975 guarantee(false, "Not using this policy feature yet."); | |
| 976 return NULL; | |
| 977 } | |
| 978 | |
| 979 | |
| 980 #ifndef PRODUCT | |
| 981 bool G1CollectorPolicy::verify_young_ages() { | |
| 982 HeapRegion* head = _g1->young_list_first_region(); | |
| 983 return | |
| 984 verify_young_ages(head, _short_lived_surv_rate_group); | |
| 985 // also call verify_young_ages on any additional surv rate groups | |
| 986 } | |
| 987 | |
| 988 bool | |
| 989 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
| 990 SurvRateGroup *surv_rate_group) { | |
| 991 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
| 992 | |
| 993 const char* name = surv_rate_group->name(); | |
| 994 bool ret = true; | |
| 995 int prev_age = -1; | |
| 996 | |
| 997 for (HeapRegion* curr = head; | |
| 998 curr != NULL; | |
| 999 curr = curr->get_next_young_region()) { | |
| 1000 SurvRateGroup* group = curr->surv_rate_group(); | |
| 1001 if (group == NULL && !curr->is_survivor()) { | |
| 1002 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
| 1003 ret = false; | |
| 1004 } | |
| 1005 | |
| 1006 if (surv_rate_group == group) { | |
| 1007 int age = curr->age_in_surv_rate_group(); | |
| 1008 | |
| 1009 if (age < 0) { | |
| 1010 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
| 1011 ret = false; | |
| 1012 } | |
| 1013 | |
| 1014 if (age <= prev_age) { | |
| 1015 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
| 1016 "(%d, %d)", name, age, prev_age); | |
| 1017 ret = false; | |
| 1018 } | |
| 1019 prev_age = age; | |
| 1020 } | |
| 1021 } | |
| 1022 | |
| 1023 return ret; | |
| 1024 } | |
| 1025 #endif // PRODUCT | |
| 1026 | |
| 1027 void G1CollectorPolicy::record_full_collection_start() { | |
| 1028 _cur_collection_start_sec = os::elapsedTime(); | |
| 1029 // Release the future to-space so that it is available for compaction into. | |
| 1030 _g1->set_full_collection(); | |
| 1031 } | |
| 1032 | |
| 1033 void G1CollectorPolicy::record_full_collection_end() { | |
| 1034 // Consider this like a collection pause for the purposes of allocation | |
| 1035 // since last pause. | |
| 1036 double end_sec = os::elapsedTime(); | |
| 1037 double full_gc_time_sec = end_sec - _cur_collection_start_sec; | |
| 1038 double full_gc_time_ms = full_gc_time_sec * 1000.0; | |
| 1039 | |
| 1040 _all_full_gc_times_ms->add(full_gc_time_ms); | |
| 1041 | |
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1042 update_recent_gc_times(end_sec, full_gc_time_ms); |
| 342 | 1043 |
| 1044 _g1->clear_full_collection(); | |
| 1045 | |
| 1046 // "Nuke" the heuristics that control the fully/partially young GC | |
| 1047 // transitions and make sure we start with fully young GCs after the | |
| 1048 // Full GC. | |
| 1049 set_full_young_gcs(true); | |
| 1050 _last_full_young_gc = false; | |
| 1051 _should_revert_to_full_young_gcs = false; | |
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1052 clear_initiate_conc_mark_if_possible(); |
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1053 clear_during_initial_mark_pause(); |
| 342 | 1054 _known_garbage_bytes = 0; |
| 1055 _known_garbage_ratio = 0.0; | |
| 1056 _in_marking_window = false; | |
| 1057 _in_marking_window_im = false; | |
| 1058 | |
| 1059 _short_lived_surv_rate_group->record_scan_only_prefix(0); | |
| 1060 _short_lived_surv_rate_group->start_adding_regions(); | |
| 1061 // also call this on any additional surv rate groups | |
| 1062 | |
| 545 | 1063 record_survivor_regions(0, NULL, NULL); |
| 1064 | |
| 342 | 1065 _prev_region_num_young = _region_num_young; |
| 1066 _prev_region_num_tenured = _region_num_tenured; | |
| 1067 | |
| 1068 _free_regions_at_end_of_collection = _g1->free_regions(); | |
| 1069 _scan_only_regions_at_end_of_collection = 0; | |
| 545 | 1070 // Reset survivors SurvRateGroup. |
| 1071 _survivor_surv_rate_group->reset(); | |
| 342 | 1072 calculate_young_list_min_length(); |
| 1073 calculate_young_list_target_config(); | |
| 1074 } | |
| 1075 | |
| 1076 void G1CollectorPolicy::record_before_bytes(size_t bytes) { | |
| 1077 _bytes_in_to_space_before_gc += bytes; | |
| 1078 } | |
| 1079 | |
| 1080 void G1CollectorPolicy::record_after_bytes(size_t bytes) { | |
| 1081 _bytes_in_to_space_after_gc += bytes; | |
| 1082 } | |
| 1083 | |
| 1084 void G1CollectorPolicy::record_stop_world_start() { | |
| 1085 _stop_world_start = os::elapsedTime(); | |
| 1086 } | |
| 1087 | |
| 1088 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, | |
| 1089 size_t start_used) { | |
| 1090 if (PrintGCDetails) { | |
| 1091 gclog_or_tty->stamp(PrintGCTimeStamps); | |
| 1092 gclog_or_tty->print("[GC pause"); | |
| 1093 if (in_young_gc_mode()) | |
| 1094 gclog_or_tty->print(" (%s)", full_young_gcs() ? "young" : "partial"); | |
| 1095 } | |
| 1096 | |
| 1097 assert(_g1->used_regions() == _g1->recalculate_used_regions(), | |
| 1098 "sanity"); | |
| 636 | 1099 assert(_g1->used() == _g1->recalculate_used(), "sanity"); |
| 342 | 1100 |
| 1101 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
| 1102 _all_stop_world_times_ms->add(s_w_t_ms); | |
| 1103 _stop_world_start = 0.0; | |
| 1104 | |
| 1105 _cur_collection_start_sec = start_time_sec; | |
| 1106 _cur_collection_pause_used_at_start_bytes = start_used; | |
| 1107 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); | |
| 1108 _pending_cards = _g1->pending_card_num(); | |
| 1109 _max_pending_cards = _g1->max_pending_card_num(); | |
| 1110 | |
| 1111 _bytes_in_to_space_before_gc = 0; | |
| 1112 _bytes_in_to_space_after_gc = 0; | |
| 1113 _bytes_in_collection_set_before_gc = 0; | |
| 1114 | |
| 1115 #ifdef DEBUG | |
| 1116 // initialise these to something well known so that we can spot | |
| 1117 // if they are not set properly | |
| 1118 | |
| 1119 for (int i = 0; i < _parallel_gc_threads; ++i) { | |
| 1120 _par_last_ext_root_scan_times_ms[i] = -666.0; | |
| 1121 _par_last_mark_stack_scan_times_ms[i] = -666.0; | |
| 1122 _par_last_scan_only_times_ms[i] = -666.0; | |
| 1123 _par_last_scan_only_regions_scanned[i] = -666.0; | |
| 1124 _par_last_update_rs_start_times_ms[i] = -666.0; | |
| 1125 _par_last_update_rs_times_ms[i] = -666.0; | |
| 1126 _par_last_update_rs_processed_buffers[i] = -666.0; | |
| 1127 _par_last_scan_rs_start_times_ms[i] = -666.0; | |
| 1128 _par_last_scan_rs_times_ms[i] = -666.0; | |
| 1129 _par_last_scan_new_refs_times_ms[i] = -666.0; | |
| 1130 _par_last_obj_copy_times_ms[i] = -666.0; | |
| 1131 _par_last_termination_times_ms[i] = -666.0; | |
| 1132 } | |
| 1133 #endif | |
| 1134 | |
| 1135 for (int i = 0; i < _aux_num; ++i) { | |
| 1136 _cur_aux_times_ms[i] = 0.0; | |
| 1137 _cur_aux_times_set[i] = false; | |
| 1138 } | |
| 1139 | |
| 1140 _satb_drain_time_set = false; | |
| 1141 _last_satb_drain_processed_buffers = -1; | |
| 1142 | |
| 1143 if (in_young_gc_mode()) | |
| 1144 _last_young_gc_full = false; | |
| 1145 | |
| 1146 | |
| 1147 // do that for any other surv rate groups | |
| 1148 _short_lived_surv_rate_group->stop_adding_regions(); | |
| 1149 size_t short_lived_so_length = _young_list_so_prefix_length; | |
| 1150 _short_lived_surv_rate_group->record_scan_only_prefix(short_lived_so_length); | |
| 1151 tag_scan_only(short_lived_so_length); | |
| 1282 | 1152 _survivors_age_table.clear(); |
| 545 | 1153 |
| 342 | 1154 assert( verify_young_ages(), "region age verification" ); |
| 1155 } | |
| 1156 | |
| 1157 void G1CollectorPolicy::tag_scan_only(size_t short_lived_scan_only_length) { | |
| 1158 // done in a way that it can be extended for other surv rate groups too... | |
| 1159 | |
| 1160 HeapRegion* head = _g1->young_list_first_region(); | |
| 1161 bool finished_short_lived = (short_lived_scan_only_length == 0); | |
| 1162 | |
| 1163 if (finished_short_lived) | |
| 1164 return; | |
| 1165 | |
| 1166 for (HeapRegion* curr = head; | |
| 1167 curr != NULL; | |
| 1168 curr = curr->get_next_young_region()) { | |
| 1169 SurvRateGroup* surv_rate_group = curr->surv_rate_group(); | |
| 1170 int age = curr->age_in_surv_rate_group(); | |
| 1171 | |
| 1172 if (surv_rate_group == _short_lived_surv_rate_group) { | |
| 1173 if ((size_t)age < short_lived_scan_only_length) | |
| 1174 curr->set_scan_only(); | |
| 1175 else | |
| 1176 finished_short_lived = true; | |
| 1177 } | |
| 1178 | |
| 1179 | |
| 1180 if (finished_short_lived) | |
| 1181 return; | |
| 1182 } | |
| 1183 | |
| 1184 guarantee( false, "we should never reach here" ); | |
| 1185 } | |
| 1186 | |
| 1187 void G1CollectorPolicy::record_mark_closure_time(double mark_closure_time_ms) { | |
| 1188 _mark_closure_time_ms = mark_closure_time_ms; | |
| 1189 } | |
| 1190 | |
| 1191 void G1CollectorPolicy::record_concurrent_mark_init_start() { | |
| 1192 _mark_init_start_sec = os::elapsedTime(); | |
| 1193 guarantee(!in_young_gc_mode(), "should not do be here in young GC mode"); | |
| 1194 } | |
| 1195 | |
| 1196 void G1CollectorPolicy::record_concurrent_mark_init_end_pre(double | |
| 1197 mark_init_elapsed_time_ms) { | |
| 1198 _during_marking = true; | |
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1199 assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
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1200 clear_during_initial_mark_pause(); |
| 342 | 1201 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
| 1202 } | |
| 1203 | |
| 1204 void G1CollectorPolicy::record_concurrent_mark_init_end() { | |
| 1205 double end_time_sec = os::elapsedTime(); | |
| 1206 double elapsed_time_ms = (end_time_sec - _mark_init_start_sec) * 1000.0; | |
| 1207 _concurrent_mark_init_times_ms->add(elapsed_time_ms); | |
| 1208 record_concurrent_mark_init_end_pre(elapsed_time_ms); | |
| 1209 | |
| 1210 _mmu_tracker->add_pause(_mark_init_start_sec, end_time_sec, true); | |
| 1211 } | |
| 1212 | |
| 1213 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
| 1214 _mark_remark_start_sec = os::elapsedTime(); | |
| 1215 _during_marking = false; | |
| 1216 } | |
| 1217 | |
| 1218 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
| 1219 double end_time_sec = os::elapsedTime(); | |
| 1220 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
| 1221 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
| 1222 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
| 1223 _prev_collection_pause_end_ms += elapsed_time_ms; | |
| 1224 | |
| 1225 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
| 1226 } | |
| 1227 | |
| 1228 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
| 1229 _mark_cleanup_start_sec = os::elapsedTime(); | |
| 1230 } | |
| 1231 | |
| 1232 void | |
| 1233 G1CollectorPolicy::record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
| 1234 size_t max_live_bytes) { | |
| 1235 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
| 1236 record_concurrent_mark_cleanup_end_work2(); | |
| 1237 } | |
| 1238 | |
| 1239 void | |
| 1240 G1CollectorPolicy:: | |
| 1241 record_concurrent_mark_cleanup_end_work1(size_t freed_bytes, | |
| 1242 size_t max_live_bytes) { | |
| 1243 if (_n_marks < 2) _n_marks++; | |
| 1244 if (G1PolicyVerbose > 0) | |
| 1245 gclog_or_tty->print_cr("At end of marking, max_live is " SIZE_FORMAT " MB " | |
| 1246 " (of " SIZE_FORMAT " MB heap).", | |
| 1247 max_live_bytes/M, _g1->capacity()/M); | |
| 1248 } | |
| 1249 | |
| 1250 // The important thing about this is that it includes "os::elapsedTime". | |
| 1251 void G1CollectorPolicy::record_concurrent_mark_cleanup_end_work2() { | |
| 1252 double end_time_sec = os::elapsedTime(); | |
| 1253 double elapsed_time_ms = (end_time_sec - _mark_cleanup_start_sec)*1000.0; | |
| 1254 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
| 1255 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
| 1256 _prev_collection_pause_end_ms += elapsed_time_ms; | |
| 1257 | |
| 1258 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_time_sec, true); | |
| 1259 | |
| 1260 _num_markings++; | |
| 1261 | |
| 1262 // We did a marking, so reset the "since_last_mark" variables. | |
| 1263 double considerConcMarkCost = 1.0; | |
| 1264 // If there are available processors, concurrent activity is free... | |
| 1265 if (Threads::number_of_non_daemon_threads() * 2 < | |
| 1266 os::active_processor_count()) { | |
| 1267 considerConcMarkCost = 0.0; | |
| 1268 } | |
| 1269 _n_pauses_at_mark_end = _n_pauses; | |
| 1270 _n_marks_since_last_pause++; | |
| 1271 } | |
| 1272 | |
| 1273 void | |
| 1274 G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { | |
| 1275 if (in_young_gc_mode()) { | |
| 1276 _should_revert_to_full_young_gcs = false; | |
| 1277 _last_full_young_gc = true; | |
| 1278 _in_marking_window = false; | |
| 1279 if (adaptive_young_list_length()) | |
| 1280 calculate_young_list_target_config(); | |
| 1281 } | |
| 1282 } | |
| 1283 | |
| 1284 void G1CollectorPolicy::record_concurrent_pause() { | |
| 1285 if (_stop_world_start > 0.0) { | |
| 1286 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
| 1287 _all_yield_times_ms->add(yield_ms); | |
| 1288 } | |
| 1289 } | |
| 1290 | |
| 1291 void G1CollectorPolicy::record_concurrent_pause_end() { | |
| 1292 } | |
| 1293 | |
| 1294 void G1CollectorPolicy::record_collection_pause_end_CH_strong_roots() { | |
| 1295 _cur_CH_strong_roots_end_sec = os::elapsedTime(); | |
| 1296 _cur_CH_strong_roots_dur_ms = | |
| 1297 (_cur_CH_strong_roots_end_sec - _cur_collection_start_sec) * 1000.0; | |
| 1298 } | |
| 1299 | |
| 1300 void G1CollectorPolicy::record_collection_pause_end_G1_strong_roots() { | |
| 1301 _cur_G1_strong_roots_end_sec = os::elapsedTime(); | |
| 1302 _cur_G1_strong_roots_dur_ms = | |
| 1303 (_cur_G1_strong_roots_end_sec - _cur_CH_strong_roots_end_sec) * 1000.0; | |
| 1304 } | |
| 1305 | |
| 1306 template<class T> | |
| 1307 T sum_of(T* sum_arr, int start, int n, int N) { | |
| 1308 T sum = (T)0; | |
| 1309 for (int i = 0; i < n; i++) { | |
| 1310 int j = (start + i) % N; | |
| 1311 sum += sum_arr[j]; | |
| 1312 } | |
| 1313 return sum; | |
| 1314 } | |
| 1315 | |
| 1316 void G1CollectorPolicy::print_par_stats (int level, | |
| 1317 const char* str, | |
| 1318 double* data, | |
| 1319 bool summary) { | |
| 1320 double min = data[0], max = data[0]; | |
| 1321 double total = 0.0; | |
| 1322 int j; | |
| 1323 for (j = 0; j < level; ++j) | |
| 1324 gclog_or_tty->print(" "); | |
| 1325 gclog_or_tty->print("[%s (ms):", str); | |
| 1326 for (uint i = 0; i < ParallelGCThreads; ++i) { | |
| 1327 double val = data[i]; | |
| 1328 if (val < min) | |
| 1329 min = val; | |
| 1330 if (val > max) | |
| 1331 max = val; | |
| 1332 total += val; | |
| 1333 gclog_or_tty->print(" %3.1lf", val); | |
| 1334 } | |
| 1335 if (summary) { | |
| 1336 gclog_or_tty->print_cr(""); | |
| 1337 double avg = total / (double) ParallelGCThreads; | |
| 1338 gclog_or_tty->print(" "); | |
| 1339 for (j = 0; j < level; ++j) | |
| 1340 gclog_or_tty->print(" "); | |
| 1341 gclog_or_tty->print("Avg: %5.1lf, Min: %5.1lf, Max: %5.1lf", | |
| 1342 avg, min, max); | |
| 1343 } | |
| 1344 gclog_or_tty->print_cr("]"); | |
| 1345 } | |
| 1346 | |
| 1347 void G1CollectorPolicy::print_par_buffers (int level, | |
| 1348 const char* str, | |
| 1349 double* data, | |
| 1350 bool summary) { | |
| 1351 double min = data[0], max = data[0]; | |
| 1352 double total = 0.0; | |
| 1353 int j; | |
| 1354 for (j = 0; j < level; ++j) | |
| 1355 gclog_or_tty->print(" "); | |
| 1356 gclog_or_tty->print("[%s :", str); | |
| 1357 for (uint i = 0; i < ParallelGCThreads; ++i) { | |
| 1358 double val = data[i]; | |
| 1359 if (val < min) | |
| 1360 min = val; | |
| 1361 if (val > max) | |
| 1362 max = val; | |
| 1363 total += val; | |
| 1364 gclog_or_tty->print(" %d", (int) val); | |
| 1365 } | |
| 1366 if (summary) { | |
| 1367 gclog_or_tty->print_cr(""); | |
| 1368 double avg = total / (double) ParallelGCThreads; | |
| 1369 gclog_or_tty->print(" "); | |
| 1370 for (j = 0; j < level; ++j) | |
| 1371 gclog_or_tty->print(" "); | |
| 1372 gclog_or_tty->print("Sum: %d, Avg: %d, Min: %d, Max: %d", | |
| 1373 (int)total, (int)avg, (int)min, (int)max); | |
| 1374 } | |
| 1375 gclog_or_tty->print_cr("]"); | |
| 1376 } | |
| 1377 | |
| 1378 void G1CollectorPolicy::print_stats (int level, | |
| 1379 const char* str, | |
| 1380 double value) { | |
| 1381 for (int j = 0; j < level; ++j) | |
| 1382 gclog_or_tty->print(" "); | |
| 1383 gclog_or_tty->print_cr("[%s: %5.1lf ms]", str, value); | |
| 1384 } | |
| 1385 | |
| 1386 void G1CollectorPolicy::print_stats (int level, | |
| 1387 const char* str, | |
| 1388 int value) { | |
| 1389 for (int j = 0; j < level; ++j) | |
| 1390 gclog_or_tty->print(" "); | |
| 1391 gclog_or_tty->print_cr("[%s: %d]", str, value); | |
| 1392 } | |
| 1393 | |
| 1394 double G1CollectorPolicy::avg_value (double* data) { | |
| 1395 if (ParallelGCThreads > 0) { | |
| 1396 double ret = 0.0; | |
| 1397 for (uint i = 0; i < ParallelGCThreads; ++i) | |
| 1398 ret += data[i]; | |
| 1399 return ret / (double) ParallelGCThreads; | |
| 1400 } else { | |
| 1401 return data[0]; | |
| 1402 } | |
| 1403 } | |
| 1404 | |
| 1405 double G1CollectorPolicy::max_value (double* data) { | |
| 1406 if (ParallelGCThreads > 0) { | |
| 1407 double ret = data[0]; | |
| 1408 for (uint i = 1; i < ParallelGCThreads; ++i) | |
| 1409 if (data[i] > ret) | |
| 1410 ret = data[i]; | |
| 1411 return ret; | |
| 1412 } else { | |
| 1413 return data[0]; | |
| 1414 } | |
| 1415 } | |
| 1416 | |
| 1417 double G1CollectorPolicy::sum_of_values (double* data) { | |
| 1418 if (ParallelGCThreads > 0) { | |
| 1419 double sum = 0.0; | |
| 1420 for (uint i = 0; i < ParallelGCThreads; i++) | |
| 1421 sum += data[i]; | |
| 1422 return sum; | |
| 1423 } else { | |
| 1424 return data[0]; | |
| 1425 } | |
| 1426 } | |
| 1427 | |
| 1428 double G1CollectorPolicy::max_sum (double* data1, | |
| 1429 double* data2) { | |
| 1430 double ret = data1[0] + data2[0]; | |
| 1431 | |
| 1432 if (ParallelGCThreads > 0) { | |
| 1433 for (uint i = 1; i < ParallelGCThreads; ++i) { | |
| 1434 double data = data1[i] + data2[i]; | |
| 1435 if (data > ret) | |
| 1436 ret = data; | |
| 1437 } | |
| 1438 } | |
| 1439 return ret; | |
| 1440 } | |
| 1441 | |
| 1442 // Anything below that is considered to be zero | |
| 1443 #define MIN_TIMER_GRANULARITY 0.0000001 | |
| 1444 | |
| 677 | 1445 void G1CollectorPolicy::record_collection_pause_end(bool abandoned) { |
| 342 | 1446 double end_time_sec = os::elapsedTime(); |
| 1447 double elapsed_ms = _last_pause_time_ms; | |
| 1448 bool parallel = ParallelGCThreads > 0; | |
| 1449 double evac_ms = (end_time_sec - _cur_G1_strong_roots_end_sec) * 1000.0; | |
| 1450 size_t rs_size = | |
| 1451 _cur_collection_pause_used_regions_at_start - collection_set_size(); | |
| 1452 size_t cur_used_bytes = _g1->used(); | |
| 1453 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
| 1454 bool last_pause_included_initial_mark = false; | |
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1455 bool update_stats = !abandoned && !_g1->evacuation_failed(); |
| 342 | 1456 |
| 1457 #ifndef PRODUCT | |
| 1458 if (G1YoungSurvRateVerbose) { | |
| 1459 gclog_or_tty->print_cr(""); | |
| 1460 _short_lived_surv_rate_group->print(); | |
| 1461 // do that for any other surv rate groups too | |
| 1462 } | |
| 1463 #endif // PRODUCT | |
| 1464 | |
| 1465 if (in_young_gc_mode()) { | |
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1466 last_pause_included_initial_mark = during_initial_mark_pause(); |
| 342 | 1467 if (last_pause_included_initial_mark) |
| 1468 record_concurrent_mark_init_end_pre(0.0); | |
| 1469 | |
| 1470 size_t min_used_targ = | |
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1471 (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
| 342 | 1472 |
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1473 |
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1474 if (!_g1->mark_in_progress() && !_last_full_young_gc) { |
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1475 assert(!last_pause_included_initial_mark, "invariant"); |
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1476 if (cur_used_bytes > min_used_targ && |
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1477 cur_used_bytes > _prev_collection_pause_used_at_end_bytes) { |
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1478 assert(!during_initial_mark_pause(), "we should not see this here"); |
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1479 |
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1480 // Note: this might have already been set, if during the last |
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1481 // pause we decided to start a cycle but at the beginning of |
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1482 // this pause we decided to postpone it. That's OK. |
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1483 set_initiate_conc_mark_if_possible(); |
| 342 | 1484 } |
| 1485 } | |
| 1486 | |
| 1487 _prev_collection_pause_used_at_end_bytes = cur_used_bytes; | |
| 1488 } | |
| 1489 | |
| 1490 _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0, | |
| 1491 end_time_sec, false); | |
| 1492 | |
| 1493 guarantee(_cur_collection_pause_used_regions_at_start >= | |
| 1494 collection_set_size(), | |
| 1495 "Negative RS size?"); | |
| 1496 | |
| 1497 // This assert is exempted when we're doing parallel collection pauses, | |
| 1498 // because the fragmentation caused by the parallel GC allocation buffers | |
| 1499 // can lead to more memory being used during collection than was used | |
| 1500 // before. Best leave this out until the fragmentation problem is fixed. | |
| 1501 // Pauses in which evacuation failed can also lead to negative | |
| 1502 // collections, since no space is reclaimed from a region containing an | |
| 1503 // object whose evacuation failed. | |
| 1504 // Further, we're now always doing parallel collection. But I'm still | |
| 1505 // leaving this here as a placeholder for a more precise assertion later. | |
| 1506 // (DLD, 10/05.) | |
| 1507 assert((true || parallel) // Always using GC LABs now. | |
| 1508 || _g1->evacuation_failed() | |
| 1509 || _cur_collection_pause_used_at_start_bytes >= cur_used_bytes, | |
| 1510 "Negative collection"); | |
| 1511 | |
| 1512 size_t freed_bytes = | |
| 1513 _cur_collection_pause_used_at_start_bytes - cur_used_bytes; | |
| 1514 size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; | |
| 1515 double survival_fraction = | |
| 1516 (double)surviving_bytes/ | |
| 1517 (double)_collection_set_bytes_used_before; | |
| 1518 | |
| 1519 _n_pauses++; | |
| 1520 | |
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1521 if (update_stats) { |
| 342 | 1522 _recent_CH_strong_roots_times_ms->add(_cur_CH_strong_roots_dur_ms); |
| 1523 _recent_G1_strong_roots_times_ms->add(_cur_G1_strong_roots_dur_ms); | |
| 1524 _recent_evac_times_ms->add(evac_ms); | |
| 1525 _recent_pause_times_ms->add(elapsed_ms); | |
| 1526 | |
| 1527 _recent_rs_sizes->add(rs_size); | |
| 1528 | |
| 1529 // We exempt parallel collection from this check because Alloc Buffer | |
| 1530 // fragmentation can produce negative collections. Same with evac | |
| 1531 // failure. | |
| 1532 // Further, we're now always doing parallel collection. But I'm still | |
| 1533 // leaving this here as a placeholder for a more precise assertion later. | |
| 1534 // (DLD, 10/05. | |
| 1535 assert((true || parallel) | |
| 1536 || _g1->evacuation_failed() | |
| 1537 || surviving_bytes <= _collection_set_bytes_used_before, | |
| 1538 "Or else negative collection!"); | |
| 1539 _recent_CS_bytes_used_before->add(_collection_set_bytes_used_before); | |
| 1540 _recent_CS_bytes_surviving->add(surviving_bytes); | |
| 1541 | |
| 1542 // this is where we update the allocation rate of the application | |
| 1543 double app_time_ms = | |
| 1544 (_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms); | |
| 1545 if (app_time_ms < MIN_TIMER_GRANULARITY) { | |
| 1546 // This usually happens due to the timer not having the required | |
| 1547 // granularity. Some Linuxes are the usual culprits. | |
| 1548 // We'll just set it to something (arbitrarily) small. | |
| 1549 app_time_ms = 1.0; | |
| 1550 } | |
| 1551 size_t regions_allocated = | |
| 1552 (_region_num_young - _prev_region_num_young) + | |
| 1553 (_region_num_tenured - _prev_region_num_tenured); | |
| 1554 double alloc_rate_ms = (double) regions_allocated / app_time_ms; | |
| 1555 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
| 1556 _prev_region_num_young = _region_num_young; | |
| 1557 _prev_region_num_tenured = _region_num_tenured; | |
| 1558 | |
| 1559 double interval_ms = | |
| 1560 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
| 1561 update_recent_gc_times(end_time_sec, elapsed_ms); | |
| 1562 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; | |
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1563 if (recent_avg_pause_time_ratio() < 0.0 || |
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1564 (recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
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1565 #ifndef PRODUCT |
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1566 // Dump info to allow post-facto debugging |
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1567 gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
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1568 gclog_or_tty->print_cr("-------------------------------------------"); |
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1569 gclog_or_tty->print_cr("Recent GC Times (ms):"); |
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1570 _recent_gc_times_ms->dump(); |
|
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1571 gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
|
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|
1572 _recent_prev_end_times_for_all_gcs_sec->dump(); |
|
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|
1573 gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
|
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|
1574 _recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
|
1087
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6902701: G1: protect debugging code related to 6898948 with a debug flag
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parents:
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changeset
|
1575 // In debug mode, terminate the JVM if the user wants to debug at this point. |
|
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|
1576 assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
|
23b9a8d315fc
6902701: G1: protect debugging code related to 6898948 with a debug flag
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|
1577 #endif // !PRODUCT |
|
23b9a8d315fc
6902701: G1: protect debugging code related to 6898948 with a debug flag
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parents:
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|
1578 // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
|
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parents:
1086
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|
1579 // CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
|
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6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
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parents:
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|
1580 if (_recent_avg_pause_time_ratio < 0.0) { |
|
89f1b9ae8991
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
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parents:
1043
diff
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|
1581 _recent_avg_pause_time_ratio = 0.0; |
|
89f1b9ae8991
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|
1582 } else { |
|
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|
1583 assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
|
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|
1584 _recent_avg_pause_time_ratio = 1.0; |
|
89f1b9ae8991
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|
1585 } |
|
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|
1586 } |
| 342 | 1587 } |
| 1588 | |
| 1589 if (G1PolicyVerbose > 1) { | |
| 1590 gclog_or_tty->print_cr(" Recording collection pause(%d)", _n_pauses); | |
| 1591 } | |
| 1592 | |
| 1593 PauseSummary* summary; | |
| 677 | 1594 if (abandoned) { |
| 1595 summary = _abandoned_summary; | |
| 1596 } else { | |
| 1597 summary = _summary; | |
| 342 | 1598 } |
| 1599 | |
| 1600 double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); | |
| 1601 double mark_stack_scan_time = avg_value(_par_last_mark_stack_scan_times_ms); | |
| 1602 double scan_only_time = avg_value(_par_last_scan_only_times_ms); | |
| 1603 double scan_only_regions_scanned = | |
| 1604 sum_of_values(_par_last_scan_only_regions_scanned); | |
| 1605 double update_rs_time = avg_value(_par_last_update_rs_times_ms); | |
| 1606 double update_rs_processed_buffers = | |
| 1607 sum_of_values(_par_last_update_rs_processed_buffers); | |
| 1608 double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); | |
| 1609 double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); | |
| 1610 double termination_time = avg_value(_par_last_termination_times_ms); | |
| 1611 | |
|
648
2314b7336582
6820321: G1: Error: guarantee(check_nums(total, n, parts), "all seq lengths should match")
tonyp
parents:
640
diff
changeset
|
1612 double parallel_other_time = _cur_collection_par_time_ms - |
|
2314b7336582
6820321: G1: Error: guarantee(check_nums(total, n, parts), "all seq lengths should match")
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diff
changeset
|
1613 (update_rs_time + ext_root_scan_time + mark_stack_scan_time + |
|
2314b7336582
6820321: G1: Error: guarantee(check_nums(total, n, parts), "all seq lengths should match")
tonyp
parents:
640
diff
changeset
|
1614 scan_only_time + scan_rs_time + obj_copy_time + termination_time); |
|
595
3698e8f47799
6804746: G1: guarantee(variance() > -1.0,"variance should be >= 0") (due to evacuation failure)
tonyp
parents:
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diff
changeset
|
1615 if (update_stats) { |
| 342 | 1616 MainBodySummary* body_summary = summary->main_body_summary(); |
| 1617 guarantee(body_summary != NULL, "should not be null!"); | |
| 1618 | |
| 1619 if (_satb_drain_time_set) | |
| 1620 body_summary->record_satb_drain_time_ms(_cur_satb_drain_time_ms); | |
| 1621 else | |
| 1622 body_summary->record_satb_drain_time_ms(0.0); | |
| 1623 body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); | |
| 1624 body_summary->record_mark_stack_scan_time_ms(mark_stack_scan_time); | |
| 1625 body_summary->record_scan_only_time_ms(scan_only_time); | |
| 1626 body_summary->record_update_rs_time_ms(update_rs_time); | |
| 1627 body_summary->record_scan_rs_time_ms(scan_rs_time); | |
| 1628 body_summary->record_obj_copy_time_ms(obj_copy_time); | |
| 1629 if (parallel) { | |
| 1630 body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); | |
| 1631 body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); | |
| 1632 body_summary->record_termination_time_ms(termination_time); | |
| 1633 body_summary->record_parallel_other_time_ms(parallel_other_time); | |
| 1634 } | |
| 1635 body_summary->record_mark_closure_time_ms(_mark_closure_time_ms); | |
| 1636 } | |
| 1637 | |
| 1638 if (G1PolicyVerbose > 1) { | |
| 1639 gclog_or_tty->print_cr(" ET: %10.6f ms (avg: %10.6f ms)\n" | |
| 1640 " CH Strong: %10.6f ms (avg: %10.6f ms)\n" | |
| 1641 " G1 Strong: %10.6f ms (avg: %10.6f ms)\n" | |
| 1642 " Evac: %10.6f ms (avg: %10.6f ms)\n" | |
| 1643 " ET-RS: %10.6f ms (avg: %10.6f ms)\n" | |
| 1644 " |RS|: " SIZE_FORMAT, | |
| 1645 elapsed_ms, recent_avg_time_for_pauses_ms(), | |
| 1646 _cur_CH_strong_roots_dur_ms, recent_avg_time_for_CH_strong_ms(), | |
| 1647 _cur_G1_strong_roots_dur_ms, recent_avg_time_for_G1_strong_ms(), | |
| 1648 evac_ms, recent_avg_time_for_evac_ms(), | |
| 1649 scan_rs_time, | |
| 1650 recent_avg_time_for_pauses_ms() - | |
| 1651 recent_avg_time_for_G1_strong_ms(), | |
| 1652 rs_size); | |
| 1653 | |
| 1654 gclog_or_tty->print_cr(" Used at start: " SIZE_FORMAT"K" | |
| 1655 " At end " SIZE_FORMAT "K\n" | |
| 1656 " garbage : " SIZE_FORMAT "K" | |
| 1657 " of " SIZE_FORMAT "K\n" | |
| 1658 " survival : %6.2f%% (%6.2f%% avg)", | |
| 1659 _cur_collection_pause_used_at_start_bytes/K, | |
| 1660 _g1->used()/K, freed_bytes/K, | |
| 1661 _collection_set_bytes_used_before/K, | |
| 1662 survival_fraction*100.0, | |
| 1663 recent_avg_survival_fraction()*100.0); | |
| 1664 gclog_or_tty->print_cr(" Recent %% gc pause time: %6.2f", | |
| 1665 recent_avg_pause_time_ratio() * 100.0); | |
| 1666 } | |
| 1667 | |
| 1668 double other_time_ms = elapsed_ms; | |
| 1669 | |
| 1670 if (!abandoned) { | |
| 1671 if (_satb_drain_time_set) | |
| 1672 other_time_ms -= _cur_satb_drain_time_ms; | |
| 1673 | |
| 1674 if (parallel) | |
| 1675 other_time_ms -= _cur_collection_par_time_ms + _cur_clear_ct_time_ms; | |
| 1676 else | |
| 1677 other_time_ms -= | |
| 1678 update_rs_time + | |
| 1679 ext_root_scan_time + mark_stack_scan_time + scan_only_time + | |
| 1680 scan_rs_time + obj_copy_time; | |
| 1681 } | |
| 1682 | |
| 1683 if (PrintGCDetails) { | |
| 1684 gclog_or_tty->print_cr("%s%s, %1.8lf secs]", | |
| 677 | 1685 abandoned ? " (abandoned)" : "", |
| 342 | 1686 (last_pause_included_initial_mark) ? " (initial-mark)" : "", |
| 1687 elapsed_ms / 1000.0); | |
| 1688 | |
| 1689 if (!abandoned) { | |
| 677 | 1690 if (_satb_drain_time_set) { |
| 342 | 1691 print_stats(1, "SATB Drain Time", _cur_satb_drain_time_ms); |
| 677 | 1692 } |
| 1693 if (_last_satb_drain_processed_buffers >= 0) { | |
| 342 | 1694 print_stats(2, "Processed Buffers", _last_satb_drain_processed_buffers); |
| 677 | 1695 } |
| 1696 if (parallel) { | |
| 1697 print_stats(1, "Parallel Time", _cur_collection_par_time_ms); | |
| 1698 print_par_stats(2, "Update RS (Start)", _par_last_update_rs_start_times_ms, false); | |
| 1699 print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); | |
| 794 | 1700 print_par_buffers(3, "Processed Buffers", |
| 1701 _par_last_update_rs_processed_buffers, true); | |
| 342 | 1702 print_par_stats(2, "Ext Root Scanning", _par_last_ext_root_scan_times_ms); |
| 1703 print_par_stats(2, "Mark Stack Scanning", _par_last_mark_stack_scan_times_ms); | |
| 1704 print_par_stats(2, "Scan-Only Scanning", _par_last_scan_only_times_ms); | |
| 1705 print_par_buffers(3, "Scan-Only Regions", | |
| 1706 _par_last_scan_only_regions_scanned, true); | |
| 1707 print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms); | |
| 1708 print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms); | |
| 1709 print_par_stats(2, "Termination", _par_last_termination_times_ms); | |
| 1710 print_stats(2, "Other", parallel_other_time); | |
| 1711 print_stats(1, "Clear CT", _cur_clear_ct_time_ms); | |
| 677 | 1712 } else { |
| 1713 print_stats(1, "Update RS", update_rs_time); | |
| 794 | 1714 print_stats(2, "Processed Buffers", |
| 1715 (int)update_rs_processed_buffers); | |
| 342 | 1716 print_stats(1, "Ext Root Scanning", ext_root_scan_time); |
| 1717 print_stats(1, "Mark Stack Scanning", mark_stack_scan_time); | |
| 1718 print_stats(1, "Scan-Only Scanning", scan_only_time); | |
| 1719 print_stats(1, "Scan RS", scan_rs_time); | |
| 1720 print_stats(1, "Object Copying", obj_copy_time); | |
| 1721 } | |
| 1722 } | |
|
890
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
changeset
|
1723 #ifndef PRODUCT |
|
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
changeset
|
1724 print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms); |
|
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
changeset
|
1725 print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms); |
|
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
changeset
|
1726 print_stats(1, "Min Clear CC", _min_clear_cc_time_ms); |
|
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
changeset
|
1727 print_stats(1, "Max Clear CC", _max_clear_cc_time_ms); |
|
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
changeset
|
1728 if (_num_cc_clears > 0) { |
|
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
changeset
|
1729 print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears)); |
|
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
changeset
|
1730 } |
|
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
changeset
|
1731 #endif |
| 342 | 1732 print_stats(1, "Other", other_time_ms); |
| 1733 for (int i = 0; i < _aux_num; ++i) { | |
| 1734 if (_cur_aux_times_set[i]) { | |
| 1735 char buffer[96]; | |
| 1736 sprintf(buffer, "Aux%d", i); | |
| 1737 print_stats(1, buffer, _cur_aux_times_ms[i]); | |
| 1738 } | |
| 1739 } | |
| 1740 } | |
| 1741 if (PrintGCDetails) | |
| 1742 gclog_or_tty->print(" ["); | |
| 1743 if (PrintGC || PrintGCDetails) | |
| 1744 _g1->print_size_transition(gclog_or_tty, | |
| 1745 _cur_collection_pause_used_at_start_bytes, | |
| 1746 _g1->used(), _g1->capacity()); | |
| 1747 if (PrintGCDetails) | |
| 1748 gclog_or_tty->print_cr("]"); | |
| 1749 | |
| 1750 _all_pause_times_ms->add(elapsed_ms); | |
|
648
2314b7336582
6820321: G1: Error: guarantee(check_nums(total, n, parts), "all seq lengths should match")
tonyp
parents:
640
diff
changeset
|
1751 if (update_stats) { |
|
2314b7336582
6820321: G1: Error: guarantee(check_nums(total, n, parts), "all seq lengths should match")
tonyp
parents:
640
diff
changeset
|
1752 summary->record_total_time_ms(elapsed_ms); |
|
2314b7336582
6820321: G1: Error: guarantee(check_nums(total, n, parts), "all seq lengths should match")
tonyp
parents:
640
diff
changeset
|
1753 summary->record_other_time_ms(other_time_ms); |
|
2314b7336582
6820321: G1: Error: guarantee(check_nums(total, n, parts), "all seq lengths should match")
tonyp
parents:
640
diff
changeset
|
1754 } |
| 342 | 1755 for (int i = 0; i < _aux_num; ++i) |
| 1756 if (_cur_aux_times_set[i]) | |
| 1757 _all_aux_times_ms[i].add(_cur_aux_times_ms[i]); | |
| 1758 | |
| 1759 // Reset marks-between-pauses counter. | |
| 1760 _n_marks_since_last_pause = 0; | |
| 1761 | |
| 1762 // Update the efficiency-since-mark vars. | |
| 1763 double proc_ms = elapsed_ms * (double) _parallel_gc_threads; | |
| 1764 if (elapsed_ms < MIN_TIMER_GRANULARITY) { | |
| 1765 // This usually happens due to the timer not having the required | |
| 1766 // granularity. Some Linuxes are the usual culprits. | |
| 1767 // We'll just set it to something (arbitrarily) small. | |
| 1768 proc_ms = 1.0; | |
| 1769 } | |
| 1770 double cur_efficiency = (double) freed_bytes / proc_ms; | |
| 1771 | |
| 1772 bool new_in_marking_window = _in_marking_window; | |
| 1773 bool new_in_marking_window_im = false; | |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
changeset
|
1774 if (during_initial_mark_pause()) { |
| 342 | 1775 new_in_marking_window = true; |
| 1776 new_in_marking_window_im = true; | |
| 1777 } | |
| 1778 | |
| 1779 if (in_young_gc_mode()) { | |
| 1780 if (_last_full_young_gc) { | |
| 1781 set_full_young_gcs(false); | |
| 1782 _last_full_young_gc = false; | |
| 1783 } | |
| 1784 | |
| 1785 if ( !_last_young_gc_full ) { | |
| 1786 if ( _should_revert_to_full_young_gcs || | |
| 1787 _known_garbage_ratio < 0.05 || | |
| 1788 (adaptive_young_list_length() && | |
| 1789 (get_gc_eff_factor() * cur_efficiency < predict_young_gc_eff())) ) { | |
| 1790 set_full_young_gcs(true); | |
| 1791 } | |
| 1792 } | |
| 1793 _should_revert_to_full_young_gcs = false; | |
| 1794 | |
| 1795 if (_last_young_gc_full && !_during_marking) | |
| 1796 _young_gc_eff_seq->add(cur_efficiency); | |
| 1797 } | |
| 1798 | |
| 1799 _short_lived_surv_rate_group->start_adding_regions(); | |
| 1800 // do that for any other surv rate groupsx | |
| 1801 | |
| 1802 // <NEW PREDICTION> | |
| 1803 | |
| 677 | 1804 if (update_stats) { |
| 342 | 1805 double pause_time_ms = elapsed_ms; |
| 1806 | |
| 1807 size_t diff = 0; | |
| 1808 if (_max_pending_cards >= _pending_cards) | |
| 1809 diff = _max_pending_cards - _pending_cards; | |
| 1810 _pending_card_diff_seq->add((double) diff); | |
| 1811 | |
| 1812 double cost_per_card_ms = 0.0; | |
| 1813 if (_pending_cards > 0) { | |
| 1814 cost_per_card_ms = update_rs_time / (double) _pending_cards; | |
| 1815 _cost_per_card_ms_seq->add(cost_per_card_ms); | |
| 1816 } | |
| 1817 | |
| 1818 double cost_per_scan_only_region_ms = 0.0; | |
| 1819 if (scan_only_regions_scanned > 0.0) { | |
| 1820 cost_per_scan_only_region_ms = | |
| 1821 scan_only_time / scan_only_regions_scanned; | |
| 1822 if (_in_marking_window_im) | |
| 1823 _cost_per_scan_only_region_ms_during_cm_seq->add(cost_per_scan_only_region_ms); | |
| 1824 else | |
| 1825 _cost_per_scan_only_region_ms_seq->add(cost_per_scan_only_region_ms); | |
| 1826 } | |
| 1827 | |
| 1828 size_t cards_scanned = _g1->cards_scanned(); | |
| 1829 | |
| 1830 double cost_per_entry_ms = 0.0; | |
| 1831 if (cards_scanned > 10) { | |
| 1832 cost_per_entry_ms = scan_rs_time / (double) cards_scanned; | |
| 1833 if (_last_young_gc_full) | |
| 1834 _cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
| 1835 else | |
| 1836 _partially_young_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
| 1837 } | |
| 1838 | |
| 1839 if (_max_rs_lengths > 0) { | |
| 1840 double cards_per_entry_ratio = | |
| 1841 (double) cards_scanned / (double) _max_rs_lengths; | |
| 1842 if (_last_young_gc_full) | |
| 1843 _fully_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
| 1844 else | |
| 1845 _partially_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
| 1846 } | |
| 1847 | |
| 1848 size_t rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; | |
| 1849 if (rs_length_diff >= 0) | |
| 1850 _rs_length_diff_seq->add((double) rs_length_diff); | |
| 1851 | |
| 1852 size_t copied_bytes = surviving_bytes; | |
| 1853 double cost_per_byte_ms = 0.0; | |
| 1854 if (copied_bytes > 0) { | |
| 1855 cost_per_byte_ms = obj_copy_time / (double) copied_bytes; | |
| 1856 if (_in_marking_window) | |
| 1857 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); | |
| 1858 else | |
| 1859 _cost_per_byte_ms_seq->add(cost_per_byte_ms); | |
| 1860 } | |
| 1861 | |
| 1862 double all_other_time_ms = pause_time_ms - | |
| 1863 (update_rs_time + scan_only_time + scan_rs_time + obj_copy_time + | |
| 1864 _mark_closure_time_ms + termination_time); | |
| 1865 | |
| 1866 double young_other_time_ms = 0.0; | |
| 1867 if (_recorded_young_regions > 0) { | |
| 1868 young_other_time_ms = | |
| 1869 _recorded_young_cset_choice_time_ms + | |
| 1870 _recorded_young_free_cset_time_ms; | |
| 1871 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / | |
| 1872 (double) _recorded_young_regions); | |
| 1873 } | |
| 1874 double non_young_other_time_ms = 0.0; | |
| 1875 if (_recorded_non_young_regions > 0) { | |
| 1876 non_young_other_time_ms = | |
| 1877 _recorded_non_young_cset_choice_time_ms + | |
| 1878 _recorded_non_young_free_cset_time_ms; | |
| 1879 | |
| 1880 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
| 1881 (double) _recorded_non_young_regions); | |
| 1882 } | |
| 1883 | |
| 1884 double constant_other_time_ms = all_other_time_ms - | |
| 1885 (young_other_time_ms + non_young_other_time_ms); | |
| 1886 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
| 1887 | |
| 1888 double survival_ratio = 0.0; | |
| 1889 if (_bytes_in_collection_set_before_gc > 0) { | |
| 1890 survival_ratio = (double) bytes_in_to_space_during_gc() / | |
| 1891 (double) _bytes_in_collection_set_before_gc; | |
| 1892 } | |
| 1893 | |
| 1894 _pending_cards_seq->add((double) _pending_cards); | |
| 1895 _scanned_cards_seq->add((double) cards_scanned); | |
| 1896 _rs_lengths_seq->add((double) _max_rs_lengths); | |
| 1897 | |
| 1898 double expensive_region_limit_ms = | |
| 751 | 1899 (double) MaxGCPauseMillis - predict_constant_other_time_ms(); |
| 342 | 1900 if (expensive_region_limit_ms < 0.0) { |
| 1901 // this means that the other time was predicted to be longer than | |
| 1902 // than the max pause time | |
| 751 | 1903 expensive_region_limit_ms = (double) MaxGCPauseMillis; |
| 342 | 1904 } |
| 1905 _expensive_region_limit_ms = expensive_region_limit_ms; | |
| 1906 | |
| 1907 if (PREDICTIONS_VERBOSE) { | |
| 1908 gclog_or_tty->print_cr(""); | |
| 1909 gclog_or_tty->print_cr("PREDICTIONS %1.4lf %d " | |
| 1910 "REGIONS %d %d %d %d " | |
| 1911 "PENDING_CARDS %d %d " | |
| 1912 "CARDS_SCANNED %d %d " | |
| 1913 "RS_LENGTHS %d %d " | |
| 1914 "SCAN_ONLY_SCAN %1.6lf %1.6lf " | |
| 1915 "RS_UPDATE %1.6lf %1.6lf RS_SCAN %1.6lf %1.6lf " | |
| 1916 "SURVIVAL_RATIO %1.6lf %1.6lf " | |
| 1917 "OBJECT_COPY %1.6lf %1.6lf OTHER_CONSTANT %1.6lf %1.6lf " | |
| 1918 "OTHER_YOUNG %1.6lf %1.6lf " | |
| 1919 "OTHER_NON_YOUNG %1.6lf %1.6lf " | |
| 1920 "VTIME_DIFF %1.6lf TERMINATION %1.6lf " | |
| 1921 "ELAPSED %1.6lf %1.6lf ", | |
| 1922 _cur_collection_start_sec, | |
| 1923 (!_last_young_gc_full) ? 2 : | |
| 1924 (last_pause_included_initial_mark) ? 1 : 0, | |
| 1925 _recorded_region_num, | |
| 1926 _recorded_young_regions, | |
| 1927 _recorded_scan_only_regions, | |
| 1928 _recorded_non_young_regions, | |
| 1929 _predicted_pending_cards, _pending_cards, | |
| 1930 _predicted_cards_scanned, cards_scanned, | |
| 1931 _predicted_rs_lengths, _max_rs_lengths, | |
| 1932 _predicted_scan_only_scan_time_ms, scan_only_time, | |
| 1933 _predicted_rs_update_time_ms, update_rs_time, | |
| 1934 _predicted_rs_scan_time_ms, scan_rs_time, | |
| 1935 _predicted_survival_ratio, survival_ratio, | |
| 1936 _predicted_object_copy_time_ms, obj_copy_time, | |
| 1937 _predicted_constant_other_time_ms, constant_other_time_ms, | |
| 1938 _predicted_young_other_time_ms, young_other_time_ms, | |
| 1939 _predicted_non_young_other_time_ms, | |
| 1940 non_young_other_time_ms, | |
| 1941 _vtime_diff_ms, termination_time, | |
| 1942 _predicted_pause_time_ms, elapsed_ms); | |
| 1943 } | |
| 1944 | |
| 1945 if (G1PolicyVerbose > 0) { | |
| 1946 gclog_or_tty->print_cr("Pause Time, predicted: %1.4lfms (predicted %s), actual: %1.4lfms", | |
| 1947 _predicted_pause_time_ms, | |
| 1948 (_within_target) ? "within" : "outside", | |
| 1949 elapsed_ms); | |
| 1950 } | |
| 1951 | |
| 1952 } | |
| 1953 | |
| 1954 _in_marking_window = new_in_marking_window; | |
| 1955 _in_marking_window_im = new_in_marking_window_im; | |
| 1956 _free_regions_at_end_of_collection = _g1->free_regions(); | |
| 1957 _scan_only_regions_at_end_of_collection = _g1->young_list_length(); | |
| 1958 calculate_young_list_min_length(); | |
| 1959 calculate_young_list_target_config(); | |
| 1960 | |
| 1111 | 1961 // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
| 1282 | 1962 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
| 1111 | 1963 adjust_concurrent_refinement(update_rs_time, update_rs_processed_buffers, update_rs_time_goal_ms); |
| 1964 | |
| 342 | 1965 // </NEW PREDICTION> |
| 1966 | |
| 1967 _target_pause_time_ms = -1.0; | |
| 1968 } | |
| 1969 | |
| 1970 // <NEW PREDICTION> | |
| 1971 | |
| 1111 | 1972 void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
| 1973 double update_rs_processed_buffers, | |
| 1974 double goal_ms) { | |
| 1975 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 1976 ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); | |
| 1977 | |
| 1282 | 1978 if (G1UseAdaptiveConcRefinement) { |
| 1111 | 1979 const int k_gy = 3, k_gr = 6; |
| 1980 const double inc_k = 1.1, dec_k = 0.9; | |
| 1981 | |
| 1982 int g = cg1r->green_zone(); | |
| 1983 if (update_rs_time > goal_ms) { | |
| 1984 g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. | |
| 1985 } else { | |
| 1986 if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { | |
| 1987 g = (int)MAX2(g * inc_k, g + 1.0); | |
| 1988 } | |
| 1989 } | |
| 1990 // Change the refinement threads params | |
| 1991 cg1r->set_green_zone(g); | |
| 1992 cg1r->set_yellow_zone(g * k_gy); | |
| 1993 cg1r->set_red_zone(g * k_gr); | |
| 1994 cg1r->reinitialize_threads(); | |
| 1995 | |
| 1996 int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); | |
| 1997 int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, | |
| 1998 cg1r->yellow_zone()); | |
| 1999 // Change the barrier params | |
| 2000 dcqs.set_process_completed_threshold(processing_threshold); | |
| 2001 dcqs.set_max_completed_queue(cg1r->red_zone()); | |
| 2002 } | |
| 2003 | |
| 2004 int curr_queue_size = dcqs.completed_buffers_num(); | |
| 2005 if (curr_queue_size >= cg1r->yellow_zone()) { | |
| 2006 dcqs.set_completed_queue_padding(curr_queue_size); | |
| 2007 } else { | |
| 2008 dcqs.set_completed_queue_padding(0); | |
| 2009 } | |
| 2010 dcqs.notify_if_necessary(); | |
| 2011 } | |
| 2012 | |
| 342 | 2013 double |
| 2014 G1CollectorPolicy:: | |
| 2015 predict_young_collection_elapsed_time_ms(size_t adjustment) { | |
| 2016 guarantee( adjustment == 0 || adjustment == 1, "invariant" ); | |
| 2017 | |
| 2018 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 2019 size_t young_num = g1h->young_list_length(); | |
| 2020 if (young_num == 0) | |
| 2021 return 0.0; | |
| 2022 | |
| 2023 young_num += adjustment; | |
| 2024 size_t pending_cards = predict_pending_cards(); | |
| 2025 size_t rs_lengths = g1h->young_list_sampled_rs_lengths() + | |
| 2026 predict_rs_length_diff(); | |
| 2027 size_t card_num; | |
| 2028 if (full_young_gcs()) | |
| 2029 card_num = predict_young_card_num(rs_lengths); | |
| 2030 else | |
| 2031 card_num = predict_non_young_card_num(rs_lengths); | |
| 2032 size_t young_byte_size = young_num * HeapRegion::GrainBytes; | |
| 2033 double accum_yg_surv_rate = | |
| 2034 _short_lived_surv_rate_group->accum_surv_rate(adjustment); | |
| 2035 | |
| 2036 size_t bytes_to_copy = | |
| 2037 (size_t) (accum_yg_surv_rate * (double) HeapRegion::GrainBytes); | |
| 2038 | |
| 2039 return | |
| 2040 predict_rs_update_time_ms(pending_cards) + | |
| 2041 predict_rs_scan_time_ms(card_num) + | |
| 2042 predict_object_copy_time_ms(bytes_to_copy) + | |
| 2043 predict_young_other_time_ms(young_num) + | |
| 2044 predict_constant_other_time_ms(); | |
| 2045 } | |
| 2046 | |
| 2047 double | |
| 2048 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { | |
| 2049 size_t rs_length = predict_rs_length_diff(); | |
| 2050 size_t card_num; | |
| 2051 if (full_young_gcs()) | |
| 2052 card_num = predict_young_card_num(rs_length); | |
| 2053 else | |
| 2054 card_num = predict_non_young_card_num(rs_length); | |
| 2055 return predict_base_elapsed_time_ms(pending_cards, card_num); | |
| 2056 } | |
| 2057 | |
| 2058 double | |
| 2059 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
| 2060 size_t scanned_cards) { | |
| 2061 return | |
| 2062 predict_rs_update_time_ms(pending_cards) + | |
| 2063 predict_rs_scan_time_ms(scanned_cards) + | |
| 2064 predict_constant_other_time_ms(); | |
| 2065 } | |
| 2066 | |
| 2067 double | |
| 2068 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
| 2069 bool young) { | |
| 2070 size_t rs_length = hr->rem_set()->occupied(); | |
| 2071 size_t card_num; | |
| 2072 if (full_young_gcs()) | |
| 2073 card_num = predict_young_card_num(rs_length); | |
| 2074 else | |
| 2075 card_num = predict_non_young_card_num(rs_length); | |
| 2076 size_t bytes_to_copy = predict_bytes_to_copy(hr); | |
| 2077 | |
| 2078 double region_elapsed_time_ms = | |
| 2079 predict_rs_scan_time_ms(card_num) + | |
| 2080 predict_object_copy_time_ms(bytes_to_copy); | |
| 2081 | |
| 2082 if (young) | |
| 2083 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
| 2084 else | |
| 2085 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
| 2086 | |
| 2087 return region_elapsed_time_ms; | |
| 2088 } | |
| 2089 | |
| 2090 size_t | |
| 2091 G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { | |
| 2092 size_t bytes_to_copy; | |
| 2093 if (hr->is_marked()) | |
| 2094 bytes_to_copy = hr->max_live_bytes(); | |
| 2095 else { | |
| 2096 guarantee( hr->is_young() && hr->age_in_surv_rate_group() != -1, | |
| 2097 "invariant" ); | |
| 2098 int age = hr->age_in_surv_rate_group(); | |
| 545 | 2099 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
| 342 | 2100 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
| 2101 } | |
| 2102 | |
| 2103 return bytes_to_copy; | |
| 2104 } | |
| 2105 | |
| 2106 void | |
| 2107 G1CollectorPolicy::start_recording_regions() { | |
| 2108 _recorded_rs_lengths = 0; | |
| 2109 _recorded_scan_only_regions = 0; | |
| 2110 _recorded_young_regions = 0; | |
| 2111 _recorded_non_young_regions = 0; | |
| 2112 | |
| 2113 #if PREDICTIONS_VERBOSE | |
| 2114 _predicted_rs_lengths = 0; | |
| 2115 _predicted_cards_scanned = 0; | |
| 2116 | |
| 2117 _recorded_marked_bytes = 0; | |
| 2118 _recorded_young_bytes = 0; | |
| 2119 _predicted_bytes_to_copy = 0; | |
| 2120 #endif // PREDICTIONS_VERBOSE | |
| 2121 } | |
| 2122 | |
| 2123 void | |
| 2124 G1CollectorPolicy::record_cset_region(HeapRegion* hr, bool young) { | |
| 2125 if (young) { | |
| 2126 ++_recorded_young_regions; | |
| 2127 } else { | |
| 2128 ++_recorded_non_young_regions; | |
| 2129 } | |
| 2130 #if PREDICTIONS_VERBOSE | |
| 2131 if (young) { | |
| 545 | 2132 _recorded_young_bytes += hr->used(); |
| 342 | 2133 } else { |
| 2134 _recorded_marked_bytes += hr->max_live_bytes(); | |
| 2135 } | |
| 2136 _predicted_bytes_to_copy += predict_bytes_to_copy(hr); | |
| 2137 #endif // PREDICTIONS_VERBOSE | |
| 2138 | |
| 2139 size_t rs_length = hr->rem_set()->occupied(); | |
| 2140 _recorded_rs_lengths += rs_length; | |
| 2141 } | |
| 2142 | |
| 2143 void | |
| 2144 G1CollectorPolicy::record_scan_only_regions(size_t scan_only_length) { | |
| 2145 _recorded_scan_only_regions = scan_only_length; | |
| 2146 } | |
| 2147 | |
| 2148 void | |
| 2149 G1CollectorPolicy::end_recording_regions() { | |
| 2150 #if PREDICTIONS_VERBOSE | |
| 2151 _predicted_pending_cards = predict_pending_cards(); | |
| 2152 _predicted_rs_lengths = _recorded_rs_lengths + predict_rs_length_diff(); | |
| 2153 if (full_young_gcs()) | |
| 2154 _predicted_cards_scanned += predict_young_card_num(_predicted_rs_lengths); | |
| 2155 else | |
| 2156 _predicted_cards_scanned += | |
| 2157 predict_non_young_card_num(_predicted_rs_lengths); | |
| 2158 _recorded_region_num = _recorded_young_regions + _recorded_non_young_regions; | |
| 2159 | |
| 2160 _predicted_scan_only_scan_time_ms = | |
| 2161 predict_scan_only_time_ms(_recorded_scan_only_regions); | |
| 2162 _predicted_rs_update_time_ms = | |
| 2163 predict_rs_update_time_ms(_g1->pending_card_num()); | |
| 2164 _predicted_rs_scan_time_ms = | |
| 2165 predict_rs_scan_time_ms(_predicted_cards_scanned); | |
| 2166 _predicted_object_copy_time_ms = | |
| 2167 predict_object_copy_time_ms(_predicted_bytes_to_copy); | |
| 2168 _predicted_constant_other_time_ms = | |
| 2169 predict_constant_other_time_ms(); | |
| 2170 _predicted_young_other_time_ms = | |
| 2171 predict_young_other_time_ms(_recorded_young_regions); | |
| 2172 _predicted_non_young_other_time_ms = | |
| 2173 predict_non_young_other_time_ms(_recorded_non_young_regions); | |
| 2174 | |
| 2175 _predicted_pause_time_ms = | |
| 2176 _predicted_scan_only_scan_time_ms + | |
| 2177 _predicted_rs_update_time_ms + | |
| 2178 _predicted_rs_scan_time_ms + | |
| 2179 _predicted_object_copy_time_ms + | |
| 2180 _predicted_constant_other_time_ms + | |
| 2181 _predicted_young_other_time_ms + | |
| 2182 _predicted_non_young_other_time_ms; | |
| 2183 #endif // PREDICTIONS_VERBOSE | |
| 2184 } | |
| 2185 | |
| 2186 void G1CollectorPolicy::check_if_region_is_too_expensive(double | |
| 2187 predicted_time_ms) { | |
| 2188 // I don't think we need to do this when in young GC mode since | |
| 2189 // marking will be initiated next time we hit the soft limit anyway... | |
| 2190 if (predicted_time_ms > _expensive_region_limit_ms) { | |
| 2191 if (!in_young_gc_mode()) { | |
| 2192 set_full_young_gcs(true); | |
|
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2193 // We might want to do something different here. However, |
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2194 // right now we don't support the non-generational G1 mode |
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2195 // (and in fact we are planning to remove the associated code, |
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2196 // see CR 6814390). So, let's leave it as is and this will be |
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2197 // removed some time in the future |
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2198 ShouldNotReachHere(); |
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2199 set_during_initial_mark_pause(); |
| 342 | 2200 } else |
| 2201 // no point in doing another partial one | |
| 2202 _should_revert_to_full_young_gcs = true; | |
| 2203 } | |
| 2204 } | |
| 2205 | |
| 2206 // </NEW PREDICTION> | |
| 2207 | |
| 2208 | |
| 2209 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, | |
| 2210 double elapsed_ms) { | |
| 2211 _recent_gc_times_ms->add(elapsed_ms); | |
| 2212 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
| 2213 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
| 2214 } | |
| 2215 | |
| 2216 double G1CollectorPolicy::recent_avg_time_for_pauses_ms() { | |
| 751 | 2217 if (_recent_pause_times_ms->num() == 0) return (double) MaxGCPauseMillis; |
| 342 | 2218 else return _recent_pause_times_ms->avg(); |
| 2219 } | |
| 2220 | |
| 2221 double G1CollectorPolicy::recent_avg_time_for_CH_strong_ms() { | |
| 2222 if (_recent_CH_strong_roots_times_ms->num() == 0) | |
| 751 | 2223 return (double)MaxGCPauseMillis/3.0; |
| 342 | 2224 else return _recent_CH_strong_roots_times_ms->avg(); |
| 2225 } | |
| 2226 | |
| 2227 double G1CollectorPolicy::recent_avg_time_for_G1_strong_ms() { | |
| 2228 if (_recent_G1_strong_roots_times_ms->num() == 0) | |
| 751 | 2229 return (double)MaxGCPauseMillis/3.0; |
| 342 | 2230 else return _recent_G1_strong_roots_times_ms->avg(); |
| 2231 } | |
| 2232 | |
| 2233 double G1CollectorPolicy::recent_avg_time_for_evac_ms() { | |
| 751 | 2234 if (_recent_evac_times_ms->num() == 0) return (double)MaxGCPauseMillis/3.0; |
| 342 | 2235 else return _recent_evac_times_ms->avg(); |
| 2236 } | |
| 2237 | |
| 2238 int G1CollectorPolicy::number_of_recent_gcs() { | |
| 2239 assert(_recent_CH_strong_roots_times_ms->num() == | |
| 2240 _recent_G1_strong_roots_times_ms->num(), "Sequence out of sync"); | |
| 2241 assert(_recent_G1_strong_roots_times_ms->num() == | |
| 2242 _recent_evac_times_ms->num(), "Sequence out of sync"); | |
| 2243 assert(_recent_evac_times_ms->num() == | |
| 2244 _recent_pause_times_ms->num(), "Sequence out of sync"); | |
| 2245 assert(_recent_pause_times_ms->num() == | |
| 2246 _recent_CS_bytes_used_before->num(), "Sequence out of sync"); | |
| 2247 assert(_recent_CS_bytes_used_before->num() == | |
| 2248 _recent_CS_bytes_surviving->num(), "Sequence out of sync"); | |
| 2249 return _recent_pause_times_ms->num(); | |
| 2250 } | |
| 2251 | |
| 2252 double G1CollectorPolicy::recent_avg_survival_fraction() { | |
| 2253 return recent_avg_survival_fraction_work(_recent_CS_bytes_surviving, | |
| 2254 _recent_CS_bytes_used_before); | |
| 2255 } | |
| 2256 | |
| 2257 double G1CollectorPolicy::last_survival_fraction() { | |
| 2258 return last_survival_fraction_work(_recent_CS_bytes_surviving, | |
| 2259 _recent_CS_bytes_used_before); | |
| 2260 } | |
| 2261 | |
| 2262 double | |
| 2263 G1CollectorPolicy::recent_avg_survival_fraction_work(TruncatedSeq* surviving, | |
| 2264 TruncatedSeq* before) { | |
| 2265 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
| 2266 if (before->sum() > 0.0) { | |
| 2267 double recent_survival_rate = surviving->sum() / before->sum(); | |
| 2268 // We exempt parallel collection from this check because Alloc Buffer | |
| 2269 // fragmentation can produce negative collections. | |
| 2270 // Further, we're now always doing parallel collection. But I'm still | |
| 2271 // leaving this here as a placeholder for a more precise assertion later. | |
| 2272 // (DLD, 10/05.) | |
| 2273 assert((true || ParallelGCThreads > 0) || | |
| 2274 _g1->evacuation_failed() || | |
| 2275 recent_survival_rate <= 1.0, "Or bad frac"); | |
| 2276 return recent_survival_rate; | |
| 2277 } else { | |
| 2278 return 1.0; // Be conservative. | |
| 2279 } | |
| 2280 } | |
| 2281 | |
| 2282 double | |
| 2283 G1CollectorPolicy::last_survival_fraction_work(TruncatedSeq* surviving, | |
| 2284 TruncatedSeq* before) { | |
| 2285 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
| 2286 if (surviving->num() > 0 && before->last() > 0.0) { | |
| 2287 double last_survival_rate = surviving->last() / before->last(); | |
| 2288 // We exempt parallel collection from this check because Alloc Buffer | |
| 2289 // fragmentation can produce negative collections. | |
| 2290 // Further, we're now always doing parallel collection. But I'm still | |
| 2291 // leaving this here as a placeholder for a more precise assertion later. | |
| 2292 // (DLD, 10/05.) | |
| 2293 assert((true || ParallelGCThreads > 0) || | |
| 2294 last_survival_rate <= 1.0, "Or bad frac"); | |
| 2295 return last_survival_rate; | |
| 2296 } else { | |
| 2297 return 1.0; | |
| 2298 } | |
| 2299 } | |
| 2300 | |
| 2301 static const int survival_min_obs = 5; | |
| 2302 static double survival_min_obs_limits[] = { 0.9, 0.7, 0.5, 0.3, 0.1 }; | |
| 2303 static const double min_survival_rate = 0.1; | |
| 2304 | |
| 2305 double | |
| 2306 G1CollectorPolicy::conservative_avg_survival_fraction_work(double avg, | |
| 2307 double latest) { | |
| 2308 double res = avg; | |
| 2309 if (number_of_recent_gcs() < survival_min_obs) { | |
| 2310 res = MAX2(res, survival_min_obs_limits[number_of_recent_gcs()]); | |
| 2311 } | |
| 2312 res = MAX2(res, latest); | |
| 2313 res = MAX2(res, min_survival_rate); | |
| 2314 // In the parallel case, LAB fragmentation can produce "negative | |
| 2315 // collections"; so can evac failure. Cap at 1.0 | |
| 2316 res = MIN2(res, 1.0); | |
| 2317 return res; | |
| 2318 } | |
| 2319 | |
| 2320 size_t G1CollectorPolicy::expansion_amount() { | |
| 1356 | 2321 if ((recent_avg_pause_time_ratio() * 100.0) > _gc_overhead_perc) { |
| 751 | 2322 // We will double the existing space, or take |
| 2323 // G1ExpandByPercentOfAvailable % of the available expansion | |
| 2324 // space, whichever is smaller, bounded below by a minimum | |
| 2325 // expansion (unless that's all that's left.) | |
| 342 | 2326 const size_t min_expand_bytes = 1*M; |
| 2327 size_t reserved_bytes = _g1->g1_reserved_obj_bytes(); | |
| 2328 size_t committed_bytes = _g1->capacity(); | |
| 2329 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
| 2330 size_t expand_bytes; | |
| 2331 size_t expand_bytes_via_pct = | |
| 751 | 2332 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
| 342 | 2333 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
| 2334 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
| 2335 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
| 2336 if (G1PolicyVerbose > 1) { | |
| 2337 gclog_or_tty->print("Decided to expand: ratio = %5.2f, " | |
| 2338 "committed = %d%s, uncommited = %d%s, via pct = %d%s.\n" | |
| 2339 " Answer = %d.\n", | |
| 2340 recent_avg_pause_time_ratio(), | |
| 2341 byte_size_in_proper_unit(committed_bytes), | |
| 2342 proper_unit_for_byte_size(committed_bytes), | |
| 2343 byte_size_in_proper_unit(uncommitted_bytes), | |
| 2344 proper_unit_for_byte_size(uncommitted_bytes), | |
| 2345 byte_size_in_proper_unit(expand_bytes_via_pct), | |
| 2346 proper_unit_for_byte_size(expand_bytes_via_pct), | |
| 2347 byte_size_in_proper_unit(expand_bytes), | |
| 2348 proper_unit_for_byte_size(expand_bytes)); | |
| 2349 } | |
| 2350 return expand_bytes; | |
| 2351 } else { | |
| 2352 return 0; | |
| 2353 } | |
| 2354 } | |
| 2355 | |
| 2356 void G1CollectorPolicy::note_start_of_mark_thread() { | |
| 2357 _mark_thread_startup_sec = os::elapsedTime(); | |
| 2358 } | |
| 2359 | |
| 2360 class CountCSClosure: public HeapRegionClosure { | |
| 2361 G1CollectorPolicy* _g1_policy; | |
| 2362 public: | |
| 2363 CountCSClosure(G1CollectorPolicy* g1_policy) : | |
| 2364 _g1_policy(g1_policy) {} | |
| 2365 bool doHeapRegion(HeapRegion* r) { | |
| 2366 _g1_policy->_bytes_in_collection_set_before_gc += r->used(); | |
| 2367 return false; | |
| 2368 } | |
| 2369 }; | |
| 2370 | |
| 2371 void G1CollectorPolicy::count_CS_bytes_used() { | |
| 2372 CountCSClosure cs_closure(this); | |
| 2373 _g1->collection_set_iterate(&cs_closure); | |
| 2374 } | |
| 2375 | |
| 2376 static void print_indent(int level) { | |
| 2377 for (int j = 0; j < level+1; ++j) | |
| 2378 gclog_or_tty->print(" "); | |
| 2379 } | |
| 2380 | |
| 2381 void G1CollectorPolicy::print_summary (int level, | |
| 2382 const char* str, | |
| 2383 NumberSeq* seq) const { | |
| 2384 double sum = seq->sum(); | |
| 2385 print_indent(level); | |
| 2386 gclog_or_tty->print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", | |
| 2387 str, sum / 1000.0, seq->avg()); | |
| 2388 } | |
| 2389 | |
| 2390 void G1CollectorPolicy::print_summary_sd (int level, | |
| 2391 const char* str, | |
| 2392 NumberSeq* seq) const { | |
| 2393 print_summary(level, str, seq); | |
| 2394 print_indent(level + 5); | |
| 2395 gclog_or_tty->print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", | |
| 2396 seq->num(), seq->sd(), seq->maximum()); | |
| 2397 } | |
| 2398 | |
| 2399 void G1CollectorPolicy::check_other_times(int level, | |
| 2400 NumberSeq* other_times_ms, | |
| 2401 NumberSeq* calc_other_times_ms) const { | |
| 2402 bool should_print = false; | |
| 2403 | |
| 2404 double max_sum = MAX2(fabs(other_times_ms->sum()), | |
| 2405 fabs(calc_other_times_ms->sum())); | |
| 2406 double min_sum = MIN2(fabs(other_times_ms->sum()), | |
| 2407 fabs(calc_other_times_ms->sum())); | |
| 2408 double sum_ratio = max_sum / min_sum; | |
| 2409 if (sum_ratio > 1.1) { | |
| 2410 should_print = true; | |
| 2411 print_indent(level + 1); | |
| 2412 gclog_or_tty->print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); | |
| 2413 } | |
| 2414 | |
| 2415 double max_avg = MAX2(fabs(other_times_ms->avg()), | |
| 2416 fabs(calc_other_times_ms->avg())); | |
| 2417 double min_avg = MIN2(fabs(other_times_ms->avg()), | |
| 2418 fabs(calc_other_times_ms->avg())); | |
| 2419 double avg_ratio = max_avg / min_avg; | |
| 2420 if (avg_ratio > 1.1) { | |
| 2421 should_print = true; | |
| 2422 print_indent(level + 1); | |
| 2423 gclog_or_tty->print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); | |
| 2424 } | |
| 2425 | |
| 2426 if (other_times_ms->sum() < -0.01) { | |
| 2427 print_indent(level + 1); | |
| 2428 gclog_or_tty->print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); | |
| 2429 } | |
| 2430 | |
| 2431 if (other_times_ms->avg() < -0.01) { | |
| 2432 print_indent(level + 1); | |
| 2433 gclog_or_tty->print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); | |
| 2434 } | |
| 2435 | |
| 2436 if (calc_other_times_ms->sum() < -0.01) { | |
| 2437 should_print = true; | |
| 2438 print_indent(level + 1); | |
| 2439 gclog_or_tty->print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); | |
| 2440 } | |
| 2441 | |
| 2442 if (calc_other_times_ms->avg() < -0.01) { | |
| 2443 should_print = true; | |
| 2444 print_indent(level + 1); | |
| 2445 gclog_or_tty->print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); | |
| 2446 } | |
| 2447 | |
| 2448 if (should_print) | |
| 2449 print_summary(level, "Other(Calc)", calc_other_times_ms); | |
| 2450 } | |
| 2451 | |
| 2452 void G1CollectorPolicy::print_summary(PauseSummary* summary) const { | |
| 2453 bool parallel = ParallelGCThreads > 0; | |
| 2454 MainBodySummary* body_summary = summary->main_body_summary(); | |
| 2455 if (summary->get_total_seq()->num() > 0) { | |
| 677 | 2456 print_summary_sd(0, "Evacuation Pauses", summary->get_total_seq()); |
| 342 | 2457 if (body_summary != NULL) { |
| 2458 print_summary(1, "SATB Drain", body_summary->get_satb_drain_seq()); | |
| 2459 if (parallel) { | |
| 2460 print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); | |
| 2461 print_summary(2, "Update RS", body_summary->get_update_rs_seq()); | |
| 2462 print_summary(2, "Ext Root Scanning", | |
| 2463 body_summary->get_ext_root_scan_seq()); | |
| 2464 print_summary(2, "Mark Stack Scanning", | |
| 2465 body_summary->get_mark_stack_scan_seq()); | |
| 2466 print_summary(2, "Scan-Only Scanning", | |
| 2467 body_summary->get_scan_only_seq()); | |
| 2468 print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); | |
| 2469 print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); | |
| 2470 print_summary(2, "Termination", body_summary->get_termination_seq()); | |
| 2471 print_summary(2, "Other", body_summary->get_parallel_other_seq()); | |
| 2472 { | |
| 2473 NumberSeq* other_parts[] = { | |
| 2474 body_summary->get_update_rs_seq(), | |
| 2475 body_summary->get_ext_root_scan_seq(), | |
| 2476 body_summary->get_mark_stack_scan_seq(), | |
| 2477 body_summary->get_scan_only_seq(), | |
| 2478 body_summary->get_scan_rs_seq(), | |
| 2479 body_summary->get_obj_copy_seq(), | |
| 2480 body_summary->get_termination_seq() | |
| 2481 }; | |
| 2482 NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), | |
| 2483 7, other_parts); | |
| 2484 check_other_times(2, body_summary->get_parallel_other_seq(), | |
| 2485 &calc_other_times_ms); | |
| 2486 } | |
| 2487 print_summary(1, "Mark Closure", body_summary->get_mark_closure_seq()); | |
| 2488 print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); | |
| 2489 } else { | |
| 2490 print_summary(1, "Update RS", body_summary->get_update_rs_seq()); | |
| 2491 print_summary(1, "Ext Root Scanning", | |
| 2492 body_summary->get_ext_root_scan_seq()); | |
| 2493 print_summary(1, "Mark Stack Scanning", | |
| 2494 body_summary->get_mark_stack_scan_seq()); | |
| 2495 print_summary(1, "Scan-Only Scanning", | |
| 2496 body_summary->get_scan_only_seq()); | |
| 2497 print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); | |
| 2498 print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); | |
| 2499 } | |
| 2500 } | |
| 2501 print_summary(1, "Other", summary->get_other_seq()); | |
| 2502 { | |
| 2503 NumberSeq calc_other_times_ms; | |
| 2504 if (body_summary != NULL) { | |
| 2505 // not abandoned | |
| 2506 if (parallel) { | |
| 2507 // parallel | |
| 2508 NumberSeq* other_parts[] = { | |
| 2509 body_summary->get_satb_drain_seq(), | |
| 2510 body_summary->get_parallel_seq(), | |
| 2511 body_summary->get_clear_ct_seq() | |
| 2512 }; | |
| 677 | 2513 calc_other_times_ms = NumberSeq(summary->get_total_seq(), |
| 2514 3, other_parts); | |
| 342 | 2515 } else { |
| 2516 // serial | |
| 2517 NumberSeq* other_parts[] = { | |
| 2518 body_summary->get_satb_drain_seq(), | |
| 2519 body_summary->get_update_rs_seq(), | |
| 2520 body_summary->get_ext_root_scan_seq(), | |
| 2521 body_summary->get_mark_stack_scan_seq(), | |
| 2522 body_summary->get_scan_only_seq(), | |
| 2523 body_summary->get_scan_rs_seq(), | |
| 2524 body_summary->get_obj_copy_seq() | |
| 2525 }; | |
| 2526 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
| 677 | 2527 7, other_parts); |
| 342 | 2528 } |
| 2529 } else { | |
| 2530 // abandoned | |
| 677 | 2531 calc_other_times_ms = NumberSeq(); |
| 342 | 2532 } |
| 2533 check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); | |
| 2534 } | |
| 2535 } else { | |
| 2536 print_indent(0); | |
| 2537 gclog_or_tty->print_cr("none"); | |
| 2538 } | |
| 2539 gclog_or_tty->print_cr(""); | |
| 2540 } | |
| 2541 | |
| 2542 void | |
| 677 | 2543 G1CollectorPolicy::print_abandoned_summary(PauseSummary* summary) const { |
| 342 | 2544 bool printed = false; |
| 677 | 2545 if (summary->get_total_seq()->num() > 0) { |
| 342 | 2546 printed = true; |
| 677 | 2547 print_summary(summary); |
| 342 | 2548 } |
| 2549 if (!printed) { | |
| 2550 print_indent(0); | |
| 2551 gclog_or_tty->print_cr("none"); | |
| 2552 gclog_or_tty->print_cr(""); | |
| 2553 } | |
| 2554 } | |
| 2555 | |
| 2556 void G1CollectorPolicy::print_tracing_info() const { | |
| 2557 if (TraceGen0Time) { | |
| 2558 gclog_or_tty->print_cr("ALL PAUSES"); | |
| 2559 print_summary_sd(0, "Total", _all_pause_times_ms); | |
| 2560 gclog_or_tty->print_cr(""); | |
| 2561 gclog_or_tty->print_cr(""); | |
| 2562 gclog_or_tty->print_cr(" Full Young GC Pauses: %8d", _full_young_pause_num); | |
| 2563 gclog_or_tty->print_cr(" Partial Young GC Pauses: %8d", _partial_young_pause_num); | |
| 2564 gclog_or_tty->print_cr(""); | |
| 2565 | |
| 677 | 2566 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
| 2567 print_summary(_summary); | |
| 342 | 2568 |
| 2569 gclog_or_tty->print_cr("ABANDONED PAUSES"); | |
| 677 | 2570 print_abandoned_summary(_abandoned_summary); |
| 342 | 2571 |
| 2572 gclog_or_tty->print_cr("MISC"); | |
| 2573 print_summary_sd(0, "Stop World", _all_stop_world_times_ms); | |
| 2574 print_summary_sd(0, "Yields", _all_yield_times_ms); | |
| 2575 for (int i = 0; i < _aux_num; ++i) { | |
| 2576 if (_all_aux_times_ms[i].num() > 0) { | |
| 2577 char buffer[96]; | |
| 2578 sprintf(buffer, "Aux%d", i); | |
| 2579 print_summary_sd(0, buffer, &_all_aux_times_ms[i]); | |
| 2580 } | |
| 2581 } | |
| 2582 | |
| 2583 size_t all_region_num = _region_num_young + _region_num_tenured; | |
| 2584 gclog_or_tty->print_cr(" New Regions %8d, Young %8d (%6.2lf%%), " | |
| 2585 "Tenured %8d (%6.2lf%%)", | |
| 2586 all_region_num, | |
| 2587 _region_num_young, | |
| 2588 (double) _region_num_young / (double) all_region_num * 100.0, | |
| 2589 _region_num_tenured, | |
| 2590 (double) _region_num_tenured / (double) all_region_num * 100.0); | |
| 2591 } | |
| 2592 if (TraceGen1Time) { | |
| 2593 if (_all_full_gc_times_ms->num() > 0) { | |
| 2594 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", | |
| 2595 _all_full_gc_times_ms->num(), | |
| 2596 _all_full_gc_times_ms->sum() / 1000.0); | |
| 2597 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); | |
| 2598 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", | |
| 2599 _all_full_gc_times_ms->sd(), | |
| 2600 _all_full_gc_times_ms->maximum()); | |
| 2601 } | |
| 2602 } | |
| 2603 } | |
| 2604 | |
| 2605 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
| 2606 #ifndef PRODUCT | |
| 2607 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
| 2608 // add this call for any other surv rate groups | |
| 2609 #endif // PRODUCT | |
| 2610 } | |
| 2611 | |
| 2612 bool | |
| 2613 G1CollectorPolicy::should_add_next_region_to_young_list() { | |
| 2614 assert(in_young_gc_mode(), "should be in young GC mode"); | |
| 2615 bool ret; | |
| 2616 size_t young_list_length = _g1->young_list_length(); | |
| 545 | 2617 size_t young_list_max_length = _young_list_target_length; |
| 2618 if (G1FixedEdenSize) { | |
| 2619 young_list_max_length -= _max_survivor_regions; | |
| 2620 } | |
| 2621 if (young_list_length < young_list_max_length) { | |
| 342 | 2622 ret = true; |
| 2623 ++_region_num_young; | |
| 2624 } else { | |
| 2625 ret = false; | |
| 2626 ++_region_num_tenured; | |
| 2627 } | |
| 2628 | |
| 2629 return ret; | |
| 2630 } | |
| 2631 | |
| 2632 #ifndef PRODUCT | |
| 2633 // for debugging, bit of a hack... | |
| 2634 static char* | |
| 2635 region_num_to_mbs(int length) { | |
| 2636 static char buffer[64]; | |
| 2637 double bytes = (double) (length * HeapRegion::GrainBytes); | |
| 2638 double mbs = bytes / (double) (1024 * 1024); | |
| 2639 sprintf(buffer, "%7.2lfMB", mbs); | |
| 2640 return buffer; | |
| 2641 } | |
| 2642 #endif // PRODUCT | |
| 2643 | |
| 545 | 2644 size_t G1CollectorPolicy::max_regions(int purpose) { |
| 342 | 2645 switch (purpose) { |
| 2646 case GCAllocForSurvived: | |
| 545 | 2647 return _max_survivor_regions; |
| 342 | 2648 case GCAllocForTenured: |
| 545 | 2649 return REGIONS_UNLIMITED; |
| 342 | 2650 default: |
| 545 | 2651 ShouldNotReachHere(); |
| 2652 return REGIONS_UNLIMITED; | |
| 342 | 2653 }; |
| 2654 } | |
| 2655 | |
| 545 | 2656 // Calculates survivor space parameters. |
| 2657 void G1CollectorPolicy::calculate_survivors_policy() | |
| 2658 { | |
| 2659 if (G1FixedSurvivorSpaceSize == 0) { | |
| 2660 _max_survivor_regions = _young_list_target_length / SurvivorRatio; | |
| 2661 } else { | |
|
547
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|
2662 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
| 545 | 2663 } |
| 2664 | |
| 2665 if (G1FixedTenuringThreshold) { | |
| 2666 _tenuring_threshold = MaxTenuringThreshold; | |
| 2667 } else { | |
| 2668 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( | |
| 2669 HeapRegion::GrainWords * _max_survivor_regions); | |
| 2670 } | |
| 2671 } | |
| 2672 | |
| 342 | 2673 bool |
| 2674 G1CollectorPolicy_BestRegionsFirst::should_do_collection_pause(size_t | |
| 2675 word_size) { | |
| 2676 assert(_g1->regions_accounted_for(), "Region leakage!"); | |
| 2677 double max_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; | |
| 2678 | |
| 2679 size_t young_list_length = _g1->young_list_length(); | |
| 545 | 2680 size_t young_list_max_length = _young_list_target_length; |
| 2681 if (G1FixedEdenSize) { | |
| 2682 young_list_max_length -= _max_survivor_regions; | |
| 2683 } | |
| 2684 bool reached_target_length = young_list_length >= young_list_max_length; | |
| 342 | 2685 |
| 2686 if (in_young_gc_mode()) { | |
| 2687 if (reached_target_length) { | |
| 2688 assert( young_list_length > 0 && _g1->young_list_length() > 0, | |
| 2689 "invariant" ); | |
| 2690 _target_pause_time_ms = max_pause_time_ms; | |
| 2691 return true; | |
| 2692 } | |
| 2693 } else { | |
| 2694 guarantee( false, "should not reach here" ); | |
| 2695 } | |
| 2696 | |
| 2697 return false; | |
| 2698 } | |
| 2699 | |
| 2700 #ifndef PRODUCT | |
| 2701 class HRSortIndexIsOKClosure: public HeapRegionClosure { | |
| 2702 CollectionSetChooser* _chooser; | |
| 2703 public: | |
| 2704 HRSortIndexIsOKClosure(CollectionSetChooser* chooser) : | |
| 2705 _chooser(chooser) {} | |
| 2706 | |
| 2707 bool doHeapRegion(HeapRegion* r) { | |
| 2708 if (!r->continuesHumongous()) { | |
| 2709 assert(_chooser->regionProperlyOrdered(r), "Ought to be."); | |
| 2710 } | |
| 2711 return false; | |
| 2712 } | |
| 2713 }; | |
| 2714 | |
| 2715 bool G1CollectorPolicy_BestRegionsFirst::assertMarkedBytesDataOK() { | |
| 2716 HRSortIndexIsOKClosure cl(_collectionSetChooser); | |
| 2717 _g1->heap_region_iterate(&cl); | |
| 2718 return true; | |
| 2719 } | |
| 2720 #endif | |
| 2721 | |
| 2722 void | |
|
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2723 G1CollectorPolicy::decide_on_conc_mark_initiation() { |
|
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2724 // We are about to decide on whether this pause will be an |
|
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2725 // initial-mark pause. |
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2726 |
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2727 // First, during_initial_mark_pause() should not be already set. We |
|
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2728 // will set it here if we have to. However, it should be cleared by |
|
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2729 // the end of the pause (it's only set for the duration of an |
|
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2730 // initial-mark pause). |
|
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2731 assert(!during_initial_mark_pause(), "pre-condition"); |
|
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2732 |
|
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2733 if (initiate_conc_mark_if_possible()) { |
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2734 // We had noticed on a previous pause that the heap occupancy has |
|
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2735 // gone over the initiating threshold and we should start a |
|
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2736 // concurrent marking cycle. So we might initiate one. |
|
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2737 |
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2738 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
|
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2739 if (!during_cycle) { |
|
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2740 // The concurrent marking thread is not "during a cycle", i.e., |
|
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2741 // it has completed the last one. So we can go ahead and |
|
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2742 // initiate a new cycle. |
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2743 |
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2744 set_during_initial_mark_pause(); |
|
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2745 |
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2746 // And we can now clear initiate_conc_mark_if_possible() as |
|
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2747 // we've already acted on it. |
|
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2748 clear_initiate_conc_mark_if_possible(); |
|
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2749 } else { |
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2750 // The concurrent marking thread is still finishing up the |
|
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2751 // previous cycle. If we start one right now the two cycles |
|
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2752 // overlap. In particular, the concurrent marking thread might |
|
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2753 // be in the process of clearing the next marking bitmap (which |
|
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2754 // we will use for the next cycle if we start one). Starting a |
|
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2755 // cycle now will be bad given that parts of the marking |
|
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2756 // information might get cleared by the marking thread. And we |
|
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2757 // cannot wait for the marking thread to finish the cycle as it |
|
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2758 // periodically yields while clearing the next marking bitmap |
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2759 // and, if it's in a yield point, it's waiting for us to |
|
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2760 // finish. So, at this point we will not start a cycle and we'll |
|
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2761 // let the concurrent marking thread complete the last one. |
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2762 } |
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2763 } |
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2764 } |
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2765 |
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2766 void |
| 342 | 2767 G1CollectorPolicy_BestRegionsFirst:: |
| 2768 record_collection_pause_start(double start_time_sec, size_t start_used) { | |
| 2769 G1CollectorPolicy::record_collection_pause_start(start_time_sec, start_used); | |
| 2770 } | |
| 2771 | |
| 2772 class NextNonCSElemFinder: public HeapRegionClosure { | |
| 2773 HeapRegion* _res; | |
| 2774 public: | |
| 2775 NextNonCSElemFinder(): _res(NULL) {} | |
| 2776 bool doHeapRegion(HeapRegion* r) { | |
| 2777 if (!r->in_collection_set()) { | |
| 2778 _res = r; | |
| 2779 return true; | |
| 2780 } else { | |
| 2781 return false; | |
| 2782 } | |
| 2783 } | |
| 2784 HeapRegion* res() { return _res; } | |
| 2785 }; | |
| 2786 | |
| 2787 class KnownGarbageClosure: public HeapRegionClosure { | |
| 2788 CollectionSetChooser* _hrSorted; | |
| 2789 | |
| 2790 public: | |
| 2791 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
| 2792 _hrSorted(hrSorted) | |
| 2793 {} | |
| 2794 | |
| 2795 bool doHeapRegion(HeapRegion* r) { | |
| 2796 // We only include humongous regions in collection | |
| 2797 // sets when concurrent mark shows that their contained object is | |
| 2798 // unreachable. | |
| 2799 | |
| 2800 // Do we have any marking information for this region? | |
| 2801 if (r->is_marked()) { | |
| 2802 // We don't include humongous regions in collection | |
| 2803 // sets because we collect them immediately at the end of a marking | |
| 2804 // cycle. We also don't include young regions because we *must* | |
| 2805 // include them in the next collection pause. | |
| 2806 if (!r->isHumongous() && !r->is_young()) { | |
| 2807 _hrSorted->addMarkedHeapRegion(r); | |
| 2808 } | |
| 2809 } | |
| 2810 return false; | |
| 2811 } | |
| 2812 }; | |
| 2813 | |
| 2814 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
| 2815 CollectionSetChooser* _hrSorted; | |
| 2816 jint _marked_regions_added; | |
| 2817 jint _chunk_size; | |
| 2818 jint _cur_chunk_idx; | |
| 2819 jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) | |
| 2820 int _worker; | |
| 2821 int _invokes; | |
| 2822 | |
| 2823 void get_new_chunk() { | |
| 2824 _cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size); | |
| 2825 _cur_chunk_end = _cur_chunk_idx + _chunk_size; | |
| 2826 } | |
| 2827 void add_region(HeapRegion* r) { | |
| 2828 if (_cur_chunk_idx == _cur_chunk_end) { | |
| 2829 get_new_chunk(); | |
| 2830 } | |
| 2831 assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); | |
| 2832 _hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r); | |
| 2833 _marked_regions_added++; | |
| 2834 _cur_chunk_idx++; | |
| 2835 } | |
| 2836 | |
| 2837 public: | |
| 2838 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
| 2839 jint chunk_size, | |
| 2840 int worker) : | |
| 2841 _hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker), | |
| 2842 _marked_regions_added(0), _cur_chunk_idx(0), _cur_chunk_end(0), | |
| 2843 _invokes(0) | |
| 2844 {} | |
| 2845 | |
| 2846 bool doHeapRegion(HeapRegion* r) { | |
| 2847 // We only include humongous regions in collection | |
| 2848 // sets when concurrent mark shows that their contained object is | |
| 2849 // unreachable. | |
| 2850 _invokes++; | |
| 2851 | |
| 2852 // Do we have any marking information for this region? | |
| 2853 if (r->is_marked()) { | |
| 2854 // We don't include humongous regions in collection | |
| 2855 // sets because we collect them immediately at the end of a marking | |
| 2856 // cycle. | |
| 2857 // We also do not include young regions in collection sets | |
| 2858 if (!r->isHumongous() && !r->is_young()) { | |
| 2859 add_region(r); | |
| 2860 } | |
| 2861 } | |
| 2862 return false; | |
| 2863 } | |
| 2864 jint marked_regions_added() { return _marked_regions_added; } | |
| 2865 int invokes() { return _invokes; } | |
| 2866 }; | |
| 2867 | |
| 2868 class ParKnownGarbageTask: public AbstractGangTask { | |
| 2869 CollectionSetChooser* _hrSorted; | |
| 2870 jint _chunk_size; | |
| 2871 G1CollectedHeap* _g1; | |
| 2872 public: | |
| 2873 ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) : | |
| 2874 AbstractGangTask("ParKnownGarbageTask"), | |
| 2875 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
| 2876 _g1(G1CollectedHeap::heap()) | |
| 2877 {} | |
| 2878 | |
| 2879 void work(int i) { | |
| 2880 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size, i); | |
| 2881 // Back to zero for the claim value. | |
| 355 | 2882 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, i, |
| 2883 HeapRegion::InitialClaimValue); | |
| 342 | 2884 jint regions_added = parKnownGarbageCl.marked_regions_added(); |
| 2885 _hrSorted->incNumMarkedHeapRegions(regions_added); | |
| 2886 if (G1PrintParCleanupStats) { | |
| 2887 gclog_or_tty->print(" Thread %d called %d times, added %d regions to list.\n", | |
| 2888 i, parKnownGarbageCl.invokes(), regions_added); | |
| 2889 } | |
| 2890 } | |
| 2891 }; | |
| 2892 | |
| 2893 void | |
| 2894 G1CollectorPolicy_BestRegionsFirst:: | |
| 2895 record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
| 2896 size_t max_live_bytes) { | |
| 2897 double start; | |
| 2898 if (G1PrintParCleanupStats) start = os::elapsedTime(); | |
| 2899 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
| 2900 | |
| 2901 _collectionSetChooser->clearMarkedHeapRegions(); | |
| 2902 double clear_marked_end; | |
| 2903 if (G1PrintParCleanupStats) { | |
| 2904 clear_marked_end = os::elapsedTime(); | |
| 2905 gclog_or_tty->print_cr(" clear marked regions + work1: %8.3f ms.", | |
| 2906 (clear_marked_end - start)*1000.0); | |
| 2907 } | |
| 2908 if (ParallelGCThreads > 0) { | |
| 2909 const size_t OverpartitionFactor = 4; | |
| 2910 const size_t MinChunkSize = 8; | |
| 2911 const size_t ChunkSize = | |
| 2912 MAX2(_g1->n_regions() / (ParallelGCThreads * OverpartitionFactor), | |
| 2913 MinChunkSize); | |
| 2914 _collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(), | |
| 2915 ChunkSize); | |
| 2916 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, | |
| 2917 (int) ChunkSize); | |
| 2918 _g1->workers()->run_task(&parKnownGarbageTask); | |
| 355 | 2919 |
| 2920 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 2921 "sanity check"); | |
| 342 | 2922 } else { |
| 2923 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
| 2924 _g1->heap_region_iterate(&knownGarbagecl); | |
| 2925 } | |
| 2926 double known_garbage_end; | |
| 2927 if (G1PrintParCleanupStats) { | |
| 2928 known_garbage_end = os::elapsedTime(); | |
| 2929 gclog_or_tty->print_cr(" compute known garbage: %8.3f ms.", | |
| 2930 (known_garbage_end - clear_marked_end)*1000.0); | |
| 2931 } | |
| 2932 _collectionSetChooser->sortMarkedHeapRegions(); | |
| 2933 double sort_end; | |
| 2934 if (G1PrintParCleanupStats) { | |
| 2935 sort_end = os::elapsedTime(); | |
| 2936 gclog_or_tty->print_cr(" sorting: %8.3f ms.", | |
| 2937 (sort_end - known_garbage_end)*1000.0); | |
| 2938 } | |
| 2939 | |
| 2940 record_concurrent_mark_cleanup_end_work2(); | |
| 2941 double work2_end; | |
| 2942 if (G1PrintParCleanupStats) { | |
| 2943 work2_end = os::elapsedTime(); | |
| 2944 gclog_or_tty->print_cr(" work2: %8.3f ms.", | |
| 2945 (work2_end - sort_end)*1000.0); | |
| 2946 } | |
| 2947 } | |
| 2948 | |
| 2949 // Add the heap region to the collection set and return the conservative | |
| 2950 // estimate of the number of live bytes. | |
| 2951 void G1CollectorPolicy:: | |
| 2952 add_to_collection_set(HeapRegion* hr) { | |
| 1282 | 2953 if (G1PrintHeapRegions) { |
| 1388 | 2954 gclog_or_tty->print_cr("added region to cset " |
| 2955 "%d:["PTR_FORMAT", "PTR_FORMAT"], " | |
| 2956 "top "PTR_FORMAT", %s", | |
| 2957 hr->hrs_index(), hr->bottom(), hr->end(), | |
| 2958 hr->top(), hr->is_young() ? "YOUNG" : "NOT_YOUNG"); | |
| 342 | 2959 } |
| 2960 | |
| 2961 if (_g1->mark_in_progress()) | |
| 2962 _g1->concurrent_mark()->registerCSetRegion(hr); | |
| 2963 | |
| 2964 assert(!hr->in_collection_set(), | |
| 2965 "should not already be in the CSet"); | |
| 2966 hr->set_in_collection_set(true); | |
| 2967 hr->set_next_in_collection_set(_collection_set); | |
| 2968 _collection_set = hr; | |
| 2969 _collection_set_size++; | |
| 2970 _collection_set_bytes_used_before += hr->used(); | |
| 526 | 2971 _g1->register_region_with_in_cset_fast_test(hr); |
| 342 | 2972 } |
| 2973 | |
| 2974 void | |
| 2975 G1CollectorPolicy_BestRegionsFirst:: | |
| 677 | 2976 choose_collection_set() { |
| 342 | 2977 double non_young_start_time_sec; |
| 2978 start_recording_regions(); | |
| 2979 | |
|
1088
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2980 guarantee(_target_pause_time_ms > -1.0 |
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2981 NOT_PRODUCT(|| Universe::heap()->gc_cause() == GCCause::_scavenge_alot), |
| 677 | 2982 "_target_pause_time_ms should have been set!"); |
|
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2983 #ifndef PRODUCT |
|
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2984 if (_target_pause_time_ms <= -1.0) { |
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|
2985 assert(ScavengeALot && Universe::heap()->gc_cause() == GCCause::_scavenge_alot, "Error"); |
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2986 _target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
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2987 } |
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2988 #endif |
| 677 | 2989 assert(_collection_set == NULL, "Precondition"); |
| 342 | 2990 |
| 2991 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
| 2992 double predicted_pause_time_ms = base_time_ms; | |
| 2993 | |
| 2994 double target_time_ms = _target_pause_time_ms; | |
| 2995 double time_remaining_ms = target_time_ms - base_time_ms; | |
| 2996 | |
| 2997 // the 10% and 50% values are arbitrary... | |
| 2998 if (time_remaining_ms < 0.10*target_time_ms) { | |
| 2999 time_remaining_ms = 0.50 * target_time_ms; | |
| 3000 _within_target = false; | |
| 3001 } else { | |
| 3002 _within_target = true; | |
| 3003 } | |
| 3004 | |
| 3005 // We figure out the number of bytes available for future to-space. | |
| 3006 // For new regions without marking information, we must assume the | |
| 3007 // worst-case of complete survival. If we have marking information for a | |
| 3008 // region, we can bound the amount of live data. We can add a number of | |
| 3009 // such regions, as long as the sum of the live data bounds does not | |
| 3010 // exceed the available evacuation space. | |
| 3011 size_t max_live_bytes = _g1->free_regions() * HeapRegion::GrainBytes; | |
| 3012 | |
| 3013 size_t expansion_bytes = | |
| 3014 _g1->expansion_regions() * HeapRegion::GrainBytes; | |
| 3015 | |
| 677 | 3016 _collection_set_bytes_used_before = 0; |
| 3017 _collection_set_size = 0; | |
| 342 | 3018 |
| 3019 // Adjust for expansion and slop. | |
| 3020 max_live_bytes = max_live_bytes + expansion_bytes; | |
| 3021 | |
| 677 | 3022 assert(_g1->regions_accounted_for(), "Region leakage!"); |
| 342 | 3023 |
| 3024 HeapRegion* hr; | |
| 3025 if (in_young_gc_mode()) { | |
| 3026 double young_start_time_sec = os::elapsedTime(); | |
| 3027 | |
| 3028 if (G1PolicyVerbose > 0) { | |
| 3029 gclog_or_tty->print_cr("Adding %d young regions to the CSet", | |
| 3030 _g1->young_list_length()); | |
| 3031 } | |
| 3032 _young_cset_length = 0; | |
| 3033 _last_young_gc_full = full_young_gcs() ? true : false; | |
| 3034 if (_last_young_gc_full) | |
| 3035 ++_full_young_pause_num; | |
| 3036 else | |
| 3037 ++_partial_young_pause_num; | |
| 3038 hr = _g1->pop_region_from_young_list(); | |
| 3039 while (hr != NULL) { | |
| 3040 | |
| 3041 assert( hr->young_index_in_cset() == -1, "invariant" ); | |
| 3042 assert( hr->age_in_surv_rate_group() != -1, "invariant" ); | |
| 3043 hr->set_young_index_in_cset((int) _young_cset_length); | |
| 3044 | |
| 3045 ++_young_cset_length; | |
| 3046 double predicted_time_ms = predict_region_elapsed_time_ms(hr, true); | |
| 3047 time_remaining_ms -= predicted_time_ms; | |
| 3048 predicted_pause_time_ms += predicted_time_ms; | |
| 677 | 3049 assert(!hr->in_collection_set(), "invariant"); |
| 3050 add_to_collection_set(hr); | |
| 3051 record_cset_region(hr, true); | |
| 342 | 3052 max_live_bytes -= MIN2(hr->max_live_bytes(), max_live_bytes); |
| 3053 if (G1PolicyVerbose > 0) { | |
| 3054 gclog_or_tty->print_cr(" Added [" PTR_FORMAT ", " PTR_FORMAT") to CS.", | |
| 3055 hr->bottom(), hr->end()); | |
| 3056 gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", | |
| 3057 max_live_bytes/K); | |
| 3058 } | |
| 3059 hr = _g1->pop_region_from_young_list(); | |
| 3060 } | |
| 3061 | |
| 3062 record_scan_only_regions(_g1->young_list_scan_only_length()); | |
| 3063 | |
| 3064 double young_end_time_sec = os::elapsedTime(); | |
| 3065 _recorded_young_cset_choice_time_ms = | |
| 3066 (young_end_time_sec - young_start_time_sec) * 1000.0; | |
| 3067 | |
| 3068 non_young_start_time_sec = os::elapsedTime(); | |
| 3069 | |
| 3070 if (_young_cset_length > 0 && _last_young_gc_full) { | |
| 3071 // don't bother adding more regions... | |
| 3072 goto choose_collection_set_end; | |
| 3073 } | |
| 3074 } | |
| 3075 | |
| 3076 if (!in_young_gc_mode() || !full_young_gcs()) { | |
| 3077 bool should_continue = true; | |
| 3078 NumberSeq seq; | |
| 3079 double avg_prediction = 100000000000000000.0; // something very large | |
| 3080 do { | |
| 3081 hr = _collectionSetChooser->getNextMarkedRegion(time_remaining_ms, | |
| 3082 avg_prediction); | |
| 677 | 3083 if (hr != NULL) { |
| 342 | 3084 double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
| 3085 time_remaining_ms -= predicted_time_ms; | |
| 3086 predicted_pause_time_ms += predicted_time_ms; | |
| 3087 add_to_collection_set(hr); | |
| 3088 record_cset_region(hr, false); | |
| 3089 max_live_bytes -= MIN2(hr->max_live_bytes(), max_live_bytes); | |
| 3090 if (G1PolicyVerbose > 0) { | |
| 3091 gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", | |
| 3092 max_live_bytes/K); | |
| 3093 } | |
| 3094 seq.add(predicted_time_ms); | |
| 3095 avg_prediction = seq.avg() + seq.sd(); | |
| 3096 } | |
| 3097 should_continue = | |
| 3098 ( hr != NULL) && | |
| 3099 ( (adaptive_young_list_length()) ? time_remaining_ms > 0.0 | |
| 3100 : _collection_set_size < _young_list_fixed_length ); | |
| 3101 } while (should_continue); | |
| 3102 | |
| 3103 if (!adaptive_young_list_length() && | |
| 3104 _collection_set_size < _young_list_fixed_length) | |
| 3105 _should_revert_to_full_young_gcs = true; | |
| 3106 } | |
| 3107 | |
| 3108 choose_collection_set_end: | |
| 3109 count_CS_bytes_used(); | |
| 3110 | |
| 3111 end_recording_regions(); | |
| 3112 | |
| 3113 double non_young_end_time_sec = os::elapsedTime(); | |
| 3114 _recorded_non_young_cset_choice_time_ms = | |
| 3115 (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; | |
| 3116 } | |
| 3117 | |
| 3118 void G1CollectorPolicy_BestRegionsFirst::record_full_collection_end() { | |
| 3119 G1CollectorPolicy::record_full_collection_end(); | |
| 3120 _collectionSetChooser->updateAfterFullCollection(); | |
| 3121 } | |
| 3122 | |
| 3123 void G1CollectorPolicy_BestRegionsFirst:: | |
| 3124 expand_if_possible(size_t numRegions) { | |
| 3125 size_t expansion_bytes = numRegions * HeapRegion::GrainBytes; | |
| 3126 _g1->expand(expansion_bytes); | |
| 3127 } | |
| 3128 | |
| 3129 void G1CollectorPolicy_BestRegionsFirst:: | |
| 677 | 3130 record_collection_pause_end(bool abandoned) { |
| 3131 G1CollectorPolicy::record_collection_pause_end(abandoned); | |
| 342 | 3132 assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end."); |
| 3133 } |