Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.hpp @ 3823:14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
Summary: In root processing, move the scanning of the reference processor's discovered lists to before RSet updating and scanning. When scanning the reference processor's discovered lists, use a buffering closure so that the time spent copying any reference object is correctly attributed. Also removed a couple of unused and irrelevant timers.
Reviewed-by: ysr, jmasa
| author | johnc |
|---|---|
| date | Mon, 01 Aug 2011 10:04:28 -0700 |
| parents | 053d84a76d3d |
| children | f44782f04dd4 |
| rev | line source |
|---|---|
| 342 | 1 /* |
|
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2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTORPOLICY_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTORPOLICY_HPP | |
| 27 | |
| 28 #include "gc_implementation/g1/collectionSetChooser.hpp" | |
| 29 #include "gc_implementation/g1/g1MMUTracker.hpp" | |
| 30 #include "memory/collectorPolicy.hpp" | |
| 31 | |
| 342 | 32 // A G1CollectorPolicy makes policy decisions that determine the |
| 33 // characteristics of the collector. Examples include: | |
| 34 // * choice of collection set. | |
| 35 // * when to collect. | |
| 36 | |
| 37 class HeapRegion; | |
| 38 class CollectionSetChooser; | |
| 39 | |
| 40 // Yes, this is a bit unpleasant... but it saves replicating the same thing | |
| 41 // over and over again and introducing subtle problems through small typos and | |
| 42 // cutting and pasting mistakes. The macros below introduces a number | |
| 43 // sequnce into the following two classes and the methods that access it. | |
| 44 | |
| 45 #define define_num_seq(name) \ | |
| 46 private: \ | |
| 47 NumberSeq _all_##name##_times_ms; \ | |
| 48 public: \ | |
| 49 void record_##name##_time_ms(double ms) { \ | |
| 50 _all_##name##_times_ms.add(ms); \ | |
| 51 } \ | |
| 52 NumberSeq* get_##name##_seq() { \ | |
| 53 return &_all_##name##_times_ms; \ | |
| 54 } | |
| 55 | |
| 56 class MainBodySummary; | |
| 57 | |
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58 class PauseSummary: public CHeapObj { |
| 342 | 59 define_num_seq(total) |
| 60 define_num_seq(other) | |
| 61 | |
| 62 public: | |
| 63 virtual MainBodySummary* main_body_summary() { return NULL; } | |
| 64 }; | |
| 65 | |
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66 class MainBodySummary: public CHeapObj { |
| 342 | 67 define_num_seq(satb_drain) // optional |
| 68 define_num_seq(parallel) // parallel only | |
| 69 define_num_seq(ext_root_scan) | |
| 70 define_num_seq(mark_stack_scan) | |
| 71 define_num_seq(update_rs) | |
| 72 define_num_seq(scan_rs) | |
| 73 define_num_seq(obj_copy) | |
| 74 define_num_seq(termination) // parallel only | |
| 75 define_num_seq(parallel_other) // parallel only | |
| 76 define_num_seq(mark_closure) | |
| 77 define_num_seq(clear_ct) // parallel only | |
| 78 }; | |
| 79 | |
| 677 | 80 class Summary: public PauseSummary, |
| 81 public MainBodySummary { | |
| 342 | 82 public: |
| 83 virtual MainBodySummary* main_body_summary() { return this; } | |
| 84 }; | |
| 85 | |
| 86 class G1CollectorPolicy: public CollectorPolicy { | |
| 87 protected: | |
| 88 // The number of pauses during the execution. | |
| 89 long _n_pauses; | |
| 90 | |
| 91 // either equal to the number of parallel threads, if ParallelGCThreads | |
| 92 // has been set, or 1 otherwise | |
| 93 int _parallel_gc_threads; | |
| 94 | |
| 95 enum SomePrivateConstants { | |
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96 NumPrevPausesForHeuristics = 10 |
| 342 | 97 }; |
| 98 | |
| 99 G1MMUTracker* _mmu_tracker; | |
| 100 | |
| 101 void initialize_flags(); | |
| 102 | |
| 103 void initialize_all() { | |
| 104 initialize_flags(); | |
| 105 initialize_size_info(); | |
| 106 initialize_perm_generation(PermGen::MarkSweepCompact); | |
| 107 } | |
| 108 | |
| 109 virtual size_t default_init_heap_size() { | |
| 110 // Pick some reasonable default. | |
| 111 return 8*M; | |
| 112 } | |
| 113 | |
| 114 double _cur_collection_start_sec; | |
| 115 size_t _cur_collection_pause_used_at_start_bytes; | |
| 116 size_t _cur_collection_pause_used_regions_at_start; | |
| 117 size_t _prev_collection_pause_used_at_end_bytes; | |
| 118 double _cur_collection_par_time_ms; | |
| 119 double _cur_satb_drain_time_ms; | |
| 120 double _cur_clear_ct_time_ms; | |
| 121 bool _satb_drain_time_set; | |
| 122 | |
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123 #ifndef PRODUCT |
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124 // Card Table Count Cache stats |
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125 double _min_clear_cc_time_ms; // min |
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126 double _max_clear_cc_time_ms; // max |
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127 double _cur_clear_cc_time_ms; // clearing time during current pause |
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128 double _cum_clear_cc_time_ms; // cummulative clearing time |
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129 jlong _num_cc_clears; // number of times the card count cache has been cleared |
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130 #endif |
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131 |
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132 // Statistics for recent GC pauses. See below for how indexed. |
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133 TruncatedSeq* _recent_rs_scan_times_ms; |
| 342 | 134 |
| 135 // These exclude marking times. | |
| 136 TruncatedSeq* _recent_pause_times_ms; | |
| 137 TruncatedSeq* _recent_gc_times_ms; | |
| 138 | |
| 139 TruncatedSeq* _recent_CS_bytes_used_before; | |
| 140 TruncatedSeq* _recent_CS_bytes_surviving; | |
| 141 | |
| 142 TruncatedSeq* _recent_rs_sizes; | |
| 143 | |
| 144 TruncatedSeq* _concurrent_mark_init_times_ms; | |
| 145 TruncatedSeq* _concurrent_mark_remark_times_ms; | |
| 146 TruncatedSeq* _concurrent_mark_cleanup_times_ms; | |
| 147 | |
| 677 | 148 Summary* _summary; |
| 342 | 149 |
| 150 NumberSeq* _all_pause_times_ms; | |
| 151 NumberSeq* _all_full_gc_times_ms; | |
| 152 double _stop_world_start; | |
| 153 NumberSeq* _all_stop_world_times_ms; | |
| 154 NumberSeq* _all_yield_times_ms; | |
| 155 | |
| 156 size_t _region_num_young; | |
| 157 size_t _region_num_tenured; | |
| 158 size_t _prev_region_num_young; | |
| 159 size_t _prev_region_num_tenured; | |
| 160 | |
| 161 NumberSeq* _all_mod_union_times_ms; | |
| 162 | |
| 163 int _aux_num; | |
| 164 NumberSeq* _all_aux_times_ms; | |
| 165 double* _cur_aux_start_times_ms; | |
| 166 double* _cur_aux_times_ms; | |
| 167 bool* _cur_aux_times_set; | |
| 168 | |
| 1611 | 169 double* _par_last_gc_worker_start_times_ms; |
| 342 | 170 double* _par_last_ext_root_scan_times_ms; |
| 171 double* _par_last_mark_stack_scan_times_ms; | |
| 172 double* _par_last_update_rs_times_ms; | |
| 173 double* _par_last_update_rs_processed_buffers; | |
| 174 double* _par_last_scan_rs_times_ms; | |
| 175 double* _par_last_obj_copy_times_ms; | |
| 176 double* _par_last_termination_times_ms; | |
| 1611 | 177 double* _par_last_termination_attempts; |
| 178 double* _par_last_gc_worker_end_times_ms; | |
| 2430 | 179 double* _par_last_gc_worker_times_ms; |
| 342 | 180 |
| 181 // indicates that we are in young GC mode | |
| 182 bool _in_young_gc_mode; | |
| 183 | |
| 184 // indicates whether we are in full young or partially young GC mode | |
| 185 bool _full_young_gcs; | |
| 186 | |
| 187 // if true, then it tries to dynamically adjust the length of the | |
| 188 // young list | |
| 189 bool _adaptive_young_list_length; | |
| 190 size_t _young_list_min_length; | |
| 191 size_t _young_list_target_length; | |
| 192 size_t _young_list_fixed_length; | |
| 193 | |
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194 // The max number of regions we can extend the eden by while the GC |
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195 // locker is active. This should be >= _young_list_target_length; |
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196 size_t _young_list_max_length; |
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197 |
| 342 | 198 size_t _young_cset_length; |
| 199 bool _last_young_gc_full; | |
| 200 | |
| 201 unsigned _full_young_pause_num; | |
| 202 unsigned _partial_young_pause_num; | |
| 203 | |
| 204 bool _during_marking; | |
| 205 bool _in_marking_window; | |
| 206 bool _in_marking_window_im; | |
| 207 | |
| 208 SurvRateGroup* _short_lived_surv_rate_group; | |
| 209 SurvRateGroup* _survivor_surv_rate_group; | |
| 210 // add here any more surv rate groups | |
| 211 | |
| 1356 | 212 double _gc_overhead_perc; |
| 213 | |
| 342 | 214 bool during_marking() { |
| 215 return _during_marking; | |
| 216 } | |
| 217 | |
| 218 // <NEW PREDICTION> | |
| 219 | |
| 220 private: | |
| 221 enum PredictionConstants { | |
| 222 TruncatedSeqLength = 10 | |
| 223 }; | |
| 224 | |
| 225 TruncatedSeq* _alloc_rate_ms_seq; | |
| 226 double _prev_collection_pause_end_ms; | |
| 227 | |
| 228 TruncatedSeq* _pending_card_diff_seq; | |
| 229 TruncatedSeq* _rs_length_diff_seq; | |
| 230 TruncatedSeq* _cost_per_card_ms_seq; | |
| 231 TruncatedSeq* _fully_young_cards_per_entry_ratio_seq; | |
| 232 TruncatedSeq* _partially_young_cards_per_entry_ratio_seq; | |
| 233 TruncatedSeq* _cost_per_entry_ms_seq; | |
| 234 TruncatedSeq* _partially_young_cost_per_entry_ms_seq; | |
| 235 TruncatedSeq* _cost_per_byte_ms_seq; | |
| 236 TruncatedSeq* _constant_other_time_ms_seq; | |
| 237 TruncatedSeq* _young_other_cost_per_region_ms_seq; | |
| 238 TruncatedSeq* _non_young_other_cost_per_region_ms_seq; | |
| 239 | |
| 240 TruncatedSeq* _pending_cards_seq; | |
| 241 TruncatedSeq* _scanned_cards_seq; | |
| 242 TruncatedSeq* _rs_lengths_seq; | |
| 243 | |
| 244 TruncatedSeq* _cost_per_byte_ms_during_cm_seq; | |
| 245 | |
| 246 TruncatedSeq* _young_gc_eff_seq; | |
| 247 | |
| 248 TruncatedSeq* _max_conc_overhead_seq; | |
| 249 | |
| 250 size_t _recorded_young_regions; | |
| 251 size_t _recorded_non_young_regions; | |
| 252 size_t _recorded_region_num; | |
| 253 | |
| 254 size_t _free_regions_at_end_of_collection; | |
| 255 | |
| 256 size_t _recorded_rs_lengths; | |
| 257 size_t _max_rs_lengths; | |
| 258 | |
| 259 size_t _recorded_marked_bytes; | |
| 260 size_t _recorded_young_bytes; | |
| 261 | |
| 262 size_t _predicted_pending_cards; | |
| 263 size_t _predicted_cards_scanned; | |
| 264 size_t _predicted_rs_lengths; | |
| 265 size_t _predicted_bytes_to_copy; | |
| 266 | |
| 267 double _predicted_survival_ratio; | |
| 268 double _predicted_rs_update_time_ms; | |
| 269 double _predicted_rs_scan_time_ms; | |
| 270 double _predicted_object_copy_time_ms; | |
| 271 double _predicted_constant_other_time_ms; | |
| 272 double _predicted_young_other_time_ms; | |
| 273 double _predicted_non_young_other_time_ms; | |
| 274 double _predicted_pause_time_ms; | |
| 275 | |
| 276 double _vtime_diff_ms; | |
| 277 | |
| 278 double _recorded_young_free_cset_time_ms; | |
| 279 double _recorded_non_young_free_cset_time_ms; | |
| 280 | |
| 281 double _sigma; | |
| 282 double _expensive_region_limit_ms; | |
| 283 | |
| 284 size_t _rs_lengths_prediction; | |
| 285 | |
| 286 size_t _known_garbage_bytes; | |
| 287 double _known_garbage_ratio; | |
| 288 | |
| 289 double sigma() { | |
| 290 return _sigma; | |
| 291 } | |
| 292 | |
| 293 // A function that prevents us putting too much stock in small sample | |
| 294 // sets. Returns a number between 2.0 and 1.0, depending on the number | |
| 295 // of samples. 5 or more samples yields one; fewer scales linearly from | |
| 296 // 2.0 at 1 sample to 1.0 at 5. | |
| 297 double confidence_factor(int samples) { | |
| 298 if (samples > 4) return 1.0; | |
| 299 else return 1.0 + sigma() * ((double)(5 - samples))/2.0; | |
| 300 } | |
| 301 | |
| 302 double get_new_neg_prediction(TruncatedSeq* seq) { | |
| 303 return seq->davg() - sigma() * seq->dsd(); | |
| 304 } | |
| 305 | |
| 306 #ifndef PRODUCT | |
| 307 bool verify_young_ages(HeapRegion* head, SurvRateGroup *surv_rate_group); | |
| 308 #endif // PRODUCT | |
| 309 | |
| 1111 | 310 void adjust_concurrent_refinement(double update_rs_time, |
| 311 double update_rs_processed_buffers, | |
| 312 double goal_ms); | |
| 313 | |
| 342 | 314 protected: |
| 315 double _pause_time_target_ms; | |
| 316 double _recorded_young_cset_choice_time_ms; | |
| 317 double _recorded_non_young_cset_choice_time_ms; | |
| 318 bool _within_target; | |
| 319 size_t _pending_cards; | |
| 320 size_t _max_pending_cards; | |
| 321 | |
| 322 public: | |
| 323 | |
| 324 void set_region_short_lived(HeapRegion* hr) { | |
| 325 hr->install_surv_rate_group(_short_lived_surv_rate_group); | |
| 326 } | |
| 327 | |
| 328 void set_region_survivors(HeapRegion* hr) { | |
| 329 hr->install_surv_rate_group(_survivor_surv_rate_group); | |
| 330 } | |
| 331 | |
| 332 #ifndef PRODUCT | |
| 333 bool verify_young_ages(); | |
| 334 #endif // PRODUCT | |
| 335 | |
| 336 double get_new_prediction(TruncatedSeq* seq) { | |
| 337 return MAX2(seq->davg() + sigma() * seq->dsd(), | |
| 338 seq->davg() * confidence_factor(seq->num())); | |
| 339 } | |
| 340 | |
| 341 size_t young_cset_length() { | |
| 342 return _young_cset_length; | |
| 343 } | |
| 344 | |
| 345 void record_max_rs_lengths(size_t rs_lengths) { | |
| 346 _max_rs_lengths = rs_lengths; | |
| 347 } | |
| 348 | |
| 349 size_t predict_pending_card_diff() { | |
| 350 double prediction = get_new_neg_prediction(_pending_card_diff_seq); | |
| 351 if (prediction < 0.00001) | |
| 352 return 0; | |
| 353 else | |
| 354 return (size_t) prediction; | |
| 355 } | |
| 356 | |
| 357 size_t predict_pending_cards() { | |
| 358 size_t max_pending_card_num = _g1->max_pending_card_num(); | |
| 359 size_t diff = predict_pending_card_diff(); | |
| 360 size_t prediction; | |
| 361 if (diff > max_pending_card_num) | |
| 362 prediction = max_pending_card_num; | |
| 363 else | |
| 364 prediction = max_pending_card_num - diff; | |
| 365 | |
| 366 return prediction; | |
| 367 } | |
| 368 | |
| 369 size_t predict_rs_length_diff() { | |
| 370 return (size_t) get_new_prediction(_rs_length_diff_seq); | |
| 371 } | |
| 372 | |
| 373 double predict_alloc_rate_ms() { | |
| 374 return get_new_prediction(_alloc_rate_ms_seq); | |
| 375 } | |
| 376 | |
| 377 double predict_cost_per_card_ms() { | |
| 378 return get_new_prediction(_cost_per_card_ms_seq); | |
| 379 } | |
| 380 | |
| 381 double predict_rs_update_time_ms(size_t pending_cards) { | |
| 382 return (double) pending_cards * predict_cost_per_card_ms(); | |
| 383 } | |
| 384 | |
| 385 double predict_fully_young_cards_per_entry_ratio() { | |
| 386 return get_new_prediction(_fully_young_cards_per_entry_ratio_seq); | |
| 387 } | |
| 388 | |
| 389 double predict_partially_young_cards_per_entry_ratio() { | |
| 390 if (_partially_young_cards_per_entry_ratio_seq->num() < 2) | |
| 391 return predict_fully_young_cards_per_entry_ratio(); | |
| 392 else | |
| 393 return get_new_prediction(_partially_young_cards_per_entry_ratio_seq); | |
| 394 } | |
| 395 | |
| 396 size_t predict_young_card_num(size_t rs_length) { | |
| 397 return (size_t) ((double) rs_length * | |
| 398 predict_fully_young_cards_per_entry_ratio()); | |
| 399 } | |
| 400 | |
| 401 size_t predict_non_young_card_num(size_t rs_length) { | |
| 402 return (size_t) ((double) rs_length * | |
| 403 predict_partially_young_cards_per_entry_ratio()); | |
| 404 } | |
| 405 | |
| 406 double predict_rs_scan_time_ms(size_t card_num) { | |
| 407 if (full_young_gcs()) | |
| 408 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); | |
| 409 else | |
| 410 return predict_partially_young_rs_scan_time_ms(card_num); | |
| 411 } | |
| 412 | |
| 413 double predict_partially_young_rs_scan_time_ms(size_t card_num) { | |
| 414 if (_partially_young_cost_per_entry_ms_seq->num() < 3) | |
| 415 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); | |
| 416 else | |
| 417 return (double) card_num * | |
| 418 get_new_prediction(_partially_young_cost_per_entry_ms_seq); | |
| 419 } | |
| 420 | |
| 421 double predict_object_copy_time_ms_during_cm(size_t bytes_to_copy) { | |
| 422 if (_cost_per_byte_ms_during_cm_seq->num() < 3) | |
| 423 return 1.1 * (double) bytes_to_copy * | |
| 424 get_new_prediction(_cost_per_byte_ms_seq); | |
| 425 else | |
| 426 return (double) bytes_to_copy * | |
| 427 get_new_prediction(_cost_per_byte_ms_during_cm_seq); | |
| 428 } | |
| 429 | |
| 430 double predict_object_copy_time_ms(size_t bytes_to_copy) { | |
| 431 if (_in_marking_window && !_in_marking_window_im) | |
| 432 return predict_object_copy_time_ms_during_cm(bytes_to_copy); | |
| 433 else | |
| 434 return (double) bytes_to_copy * | |
| 435 get_new_prediction(_cost_per_byte_ms_seq); | |
| 436 } | |
| 437 | |
| 438 double predict_constant_other_time_ms() { | |
| 439 return get_new_prediction(_constant_other_time_ms_seq); | |
| 440 } | |
| 441 | |
| 442 double predict_young_other_time_ms(size_t young_num) { | |
| 443 return | |
| 444 (double) young_num * | |
| 445 get_new_prediction(_young_other_cost_per_region_ms_seq); | |
| 446 } | |
| 447 | |
| 448 double predict_non_young_other_time_ms(size_t non_young_num) { | |
| 449 return | |
| 450 (double) non_young_num * | |
| 451 get_new_prediction(_non_young_other_cost_per_region_ms_seq); | |
| 452 } | |
| 453 | |
| 454 void check_if_region_is_too_expensive(double predicted_time_ms); | |
| 455 | |
| 456 double predict_young_collection_elapsed_time_ms(size_t adjustment); | |
| 457 double predict_base_elapsed_time_ms(size_t pending_cards); | |
| 458 double predict_base_elapsed_time_ms(size_t pending_cards, | |
| 459 size_t scanned_cards); | |
| 460 size_t predict_bytes_to_copy(HeapRegion* hr); | |
| 461 double predict_region_elapsed_time_ms(HeapRegion* hr, bool young); | |
| 462 | |
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463 // for use by: calculate_young_list_target_length(rs_length) |
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464 bool predict_will_fit(size_t young_region_num, |
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465 double base_time_ms, |
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466 size_t init_free_regions, |
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467 double target_pause_time_ms); |
| 342 | 468 |
| 469 void start_recording_regions(); | |
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470 void record_cset_region_info(HeapRegion* hr, bool young); |
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471 void record_non_young_cset_region(HeapRegion* hr); |
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472 |
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473 void set_recorded_young_regions(size_t n_regions); |
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474 void set_recorded_young_bytes(size_t bytes); |
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475 void set_recorded_rs_lengths(size_t rs_lengths); |
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476 void set_predicted_bytes_to_copy(size_t bytes); |
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477 |
| 342 | 478 void end_recording_regions(); |
| 479 | |
| 480 void record_vtime_diff_ms(double vtime_diff_ms) { | |
| 481 _vtime_diff_ms = vtime_diff_ms; | |
| 482 } | |
| 483 | |
| 484 void record_young_free_cset_time_ms(double time_ms) { | |
| 485 _recorded_young_free_cset_time_ms = time_ms; | |
| 486 } | |
| 487 | |
| 488 void record_non_young_free_cset_time_ms(double time_ms) { | |
| 489 _recorded_non_young_free_cset_time_ms = time_ms; | |
| 490 } | |
| 491 | |
| 492 double predict_young_gc_eff() { | |
| 493 return get_new_neg_prediction(_young_gc_eff_seq); | |
| 494 } | |
| 495 | |
| 545 | 496 double predict_survivor_regions_evac_time(); |
| 497 | |
| 342 | 498 // </NEW PREDICTION> |
| 499 | |
| 500 public: | |
| 501 void cset_regions_freed() { | |
| 502 bool propagate = _last_young_gc_full && !_in_marking_window; | |
| 503 _short_lived_surv_rate_group->all_surviving_words_recorded(propagate); | |
| 504 _survivor_surv_rate_group->all_surviving_words_recorded(propagate); | |
| 505 // also call it on any more surv rate groups | |
| 506 } | |
| 507 | |
| 508 void set_known_garbage_bytes(size_t known_garbage_bytes) { | |
| 509 _known_garbage_bytes = known_garbage_bytes; | |
| 510 size_t heap_bytes = _g1->capacity(); | |
| 511 _known_garbage_ratio = (double) _known_garbage_bytes / (double) heap_bytes; | |
| 512 } | |
| 513 | |
| 514 void decrease_known_garbage_bytes(size_t known_garbage_bytes) { | |
| 515 guarantee( _known_garbage_bytes >= known_garbage_bytes, "invariant" ); | |
| 516 | |
| 517 _known_garbage_bytes -= known_garbage_bytes; | |
| 518 size_t heap_bytes = _g1->capacity(); | |
| 519 _known_garbage_ratio = (double) _known_garbage_bytes / (double) heap_bytes; | |
| 520 } | |
| 521 | |
| 522 G1MMUTracker* mmu_tracker() { | |
| 523 return _mmu_tracker; | |
| 524 } | |
| 525 | |
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526 double max_pause_time_ms() { |
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527 return _mmu_tracker->max_gc_time() * 1000.0; |
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528 } |
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529 |
| 342 | 530 double predict_init_time_ms() { |
| 531 return get_new_prediction(_concurrent_mark_init_times_ms); | |
| 532 } | |
| 533 | |
| 534 double predict_remark_time_ms() { | |
| 535 return get_new_prediction(_concurrent_mark_remark_times_ms); | |
| 536 } | |
| 537 | |
| 538 double predict_cleanup_time_ms() { | |
| 539 return get_new_prediction(_concurrent_mark_cleanup_times_ms); | |
| 540 } | |
| 541 | |
| 542 // Returns an estimate of the survival rate of the region at yg-age | |
| 543 // "yg_age". | |
| 545 | 544 double predict_yg_surv_rate(int age, SurvRateGroup* surv_rate_group) { |
| 545 TruncatedSeq* seq = surv_rate_group->get_seq(age); | |
| 342 | 546 if (seq->num() == 0) |
| 547 gclog_or_tty->print("BARF! age is %d", age); | |
| 548 guarantee( seq->num() > 0, "invariant" ); | |
| 549 double pred = get_new_prediction(seq); | |
| 550 if (pred > 1.0) | |
| 551 pred = 1.0; | |
| 552 return pred; | |
| 553 } | |
| 554 | |
| 545 | 555 double predict_yg_surv_rate(int age) { |
| 556 return predict_yg_surv_rate(age, _short_lived_surv_rate_group); | |
| 557 } | |
| 558 | |
| 342 | 559 double accum_yg_surv_rate_pred(int age) { |
| 560 return _short_lived_surv_rate_group->accum_surv_rate_pred(age); | |
| 561 } | |
| 562 | |
| 563 protected: | |
| 1611 | 564 void print_stats(int level, const char* str, double value); |
| 565 void print_stats(int level, const char* str, int value); | |
| 566 | |
| 2430 | 567 void print_par_stats(int level, const char* str, double* data); |
| 568 void print_par_sizes(int level, const char* str, double* data); | |
| 342 | 569 |
| 570 void check_other_times(int level, | |
| 571 NumberSeq* other_times_ms, | |
| 572 NumberSeq* calc_other_times_ms) const; | |
| 573 | |
| 574 void print_summary (PauseSummary* stats) const; | |
| 575 | |
| 576 void print_summary (int level, const char* str, NumberSeq* seq) const; | |
| 577 void print_summary_sd (int level, const char* str, NumberSeq* seq) const; | |
| 578 | |
| 579 double avg_value (double* data); | |
| 580 double max_value (double* data); | |
| 581 double sum_of_values (double* data); | |
| 582 double max_sum (double* data1, double* data2); | |
| 583 | |
| 584 int _last_satb_drain_processed_buffers; | |
| 585 int _last_update_rs_processed_buffers; | |
| 586 double _last_pause_time_ms; | |
| 587 | |
| 588 size_t _bytes_in_to_space_before_gc; | |
| 589 size_t _bytes_in_to_space_after_gc; | |
| 590 size_t bytes_in_to_space_during_gc() { | |
| 591 return | |
| 592 _bytes_in_to_space_after_gc - _bytes_in_to_space_before_gc; | |
| 593 } | |
| 594 size_t _bytes_in_collection_set_before_gc; | |
| 595 // Used to count used bytes in CS. | |
| 596 friend class CountCSClosure; | |
| 597 | |
| 598 // Statistics kept per GC stoppage, pause or full. | |
| 599 TruncatedSeq* _recent_prev_end_times_for_all_gcs_sec; | |
| 600 | |
| 601 // We track markings. | |
| 602 int _num_markings; | |
| 603 double _mark_thread_startup_sec; // Time at startup of marking thread | |
| 604 | |
| 605 // Add a new GC of the given duration and end time to the record. | |
| 606 void update_recent_gc_times(double end_time_sec, double elapsed_ms); | |
| 607 | |
| 608 // The head of the list (via "next_in_collection_set()") representing the | |
|
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609 // current collection set. Set from the incrementally built collection |
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610 // set at the start of the pause. |
| 342 | 611 HeapRegion* _collection_set; |
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612 |
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613 // The number of regions in the collection set. Set from the incrementally |
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614 // built collection set at the start of an evacuation pause. |
| 342 | 615 size_t _collection_set_size; |
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616 |
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617 // The number of bytes in the collection set before the pause. Set from |
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618 // the incrementally built collection set at the start of an evacuation |
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619 // pause. |
| 342 | 620 size_t _collection_set_bytes_used_before; |
| 621 | |
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622 // The associated information that is maintained while the incremental |
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623 // collection set is being built with young regions. Used to populate |
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624 // the recorded info for the evacuation pause. |
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625 |
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626 enum CSetBuildType { |
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627 Active, // We are actively building the collection set |
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628 Inactive // We are not actively building the collection set |
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629 }; |
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630 |
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631 CSetBuildType _inc_cset_build_state; |
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632 |
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633 // The head of the incrementally built collection set. |
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634 HeapRegion* _inc_cset_head; |
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635 |
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636 // The tail of the incrementally built collection set. |
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637 HeapRegion* _inc_cset_tail; |
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638 |
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639 // The number of regions in the incrementally built collection set. |
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640 // Used to set _collection_set_size at the start of an evacuation |
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641 // pause. |
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642 size_t _inc_cset_size; |
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643 |
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644 // Used as the index in the surving young words structure |
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645 // which tracks the amount of space, for each young region, |
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646 // that survives the pause. |
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647 size_t _inc_cset_young_index; |
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648 |
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649 // The number of bytes in the incrementally built collection set. |
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650 // Used to set _collection_set_bytes_used_before at the start of |
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651 // an evacuation pause. |
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652 size_t _inc_cset_bytes_used_before; |
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653 |
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654 // Used to record the highest end of heap region in collection set |
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655 HeapWord* _inc_cset_max_finger; |
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656 |
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657 // The number of recorded used bytes in the young regions |
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658 // of the collection set. This is the sum of the used() bytes |
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659 // of retired young regions in the collection set. |
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660 size_t _inc_cset_recorded_young_bytes; |
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661 |
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662 // The RSet lengths recorded for regions in the collection set |
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663 // (updated by the periodic sampling of the regions in the |
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664 // young list/collection set). |
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665 size_t _inc_cset_recorded_rs_lengths; |
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666 |
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667 // The predicted elapsed time it will take to collect the regions |
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668 // in the collection set (updated by the periodic sampling of the |
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669 // regions in the young list/collection set). |
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670 double _inc_cset_predicted_elapsed_time_ms; |
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671 |
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672 // The predicted bytes to copy for the regions in the collection |
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673 // set (updated by the periodic sampling of the regions in the |
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674 // young list/collection set). |
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675 size_t _inc_cset_predicted_bytes_to_copy; |
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676 |
| 342 | 677 // Info about marking. |
| 678 int _n_marks; // Sticky at 2, so we know when we've done at least 2. | |
| 679 | |
| 680 // The number of collection pauses at the end of the last mark. | |
| 681 size_t _n_pauses_at_mark_end; | |
| 682 | |
| 683 // Stash a pointer to the g1 heap. | |
| 684 G1CollectedHeap* _g1; | |
| 685 | |
| 686 // The average time in ms per collection pause, averaged over recent pauses. | |
| 687 double recent_avg_time_for_pauses_ms(); | |
| 688 | |
|
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689 // The average time in ms for RS scanning, per pause, averaged |
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690 // over recent pauses. (Note the RS scanning time for a pause |
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691 // is itself an average of the RS scanning time for each worker |
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692 // thread.) |
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693 double recent_avg_time_for_rs_scan_ms(); |
| 342 | 694 |
| 695 // The number of "recent" GCs recorded in the number sequences | |
| 696 int number_of_recent_gcs(); | |
| 697 | |
| 698 // The average survival ratio, computed by the total number of bytes | |
| 699 // suriviving / total number of bytes before collection over the last | |
| 700 // several recent pauses. | |
| 701 double recent_avg_survival_fraction(); | |
| 702 // The survival fraction of the most recent pause; if there have been no | |
| 703 // pauses, returns 1.0. | |
| 704 double last_survival_fraction(); | |
| 705 | |
| 706 // Returns a "conservative" estimate of the recent survival rate, i.e., | |
| 707 // one that may be higher than "recent_avg_survival_fraction". | |
| 708 // This is conservative in several ways: | |
| 709 // If there have been few pauses, it will assume a potential high | |
| 710 // variance, and err on the side of caution. | |
| 711 // It puts a lower bound (currently 0.1) on the value it will return. | |
| 712 // To try to detect phase changes, if the most recent pause ("latest") has a | |
| 713 // higher-than average ("avg") survival rate, it returns that rate. | |
| 714 // "work" version is a utility function; young is restricted to young regions. | |
| 715 double conservative_avg_survival_fraction_work(double avg, | |
| 716 double latest); | |
| 717 | |
| 718 // The arguments are the two sequences that keep track of the number of bytes | |
| 719 // surviving and the total number of bytes before collection, resp., | |
| 720 // over the last evereal recent pauses | |
| 721 // Returns the survival rate for the category in the most recent pause. | |
| 722 // If there have been no pauses, returns 1.0. | |
| 723 double last_survival_fraction_work(TruncatedSeq* surviving, | |
| 724 TruncatedSeq* before); | |
| 725 | |
| 726 // The arguments are the two sequences that keep track of the number of bytes | |
| 727 // surviving and the total number of bytes before collection, resp., | |
| 728 // over the last several recent pauses | |
| 729 // Returns the average survival ration over the last several recent pauses | |
| 730 // If there have been no pauses, return 1.0 | |
| 731 double recent_avg_survival_fraction_work(TruncatedSeq* surviving, | |
| 732 TruncatedSeq* before); | |
| 733 | |
| 734 double conservative_avg_survival_fraction() { | |
| 735 double avg = recent_avg_survival_fraction(); | |
| 736 double latest = last_survival_fraction(); | |
| 737 return conservative_avg_survival_fraction_work(avg, latest); | |
| 738 } | |
| 739 | |
| 740 // The ratio of gc time to elapsed time, computed over recent pauses. | |
| 741 double _recent_avg_pause_time_ratio; | |
| 742 | |
| 743 double recent_avg_pause_time_ratio() { | |
| 744 return _recent_avg_pause_time_ratio; | |
| 745 } | |
| 746 | |
| 747 // Number of pauses between concurrent marking. | |
| 748 size_t _pauses_btwn_concurrent_mark; | |
| 749 | |
| 750 size_t _n_marks_since_last_pause; | |
| 751 | |
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752 // At the end of a pause we check the heap occupancy and we decide |
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753 // whether we will start a marking cycle during the next pause. If |
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754 // we decide that we want to do that, we will set this parameter to |
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755 // true. So, this parameter will stay true between the end of a |
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756 // pause and the beginning of a subsequent pause (not necessarily |
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757 // the next one, see the comments on the next field) when we decide |
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758 // that we will indeed start a marking cycle and do the initial-mark |
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759 // work. |
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760 volatile bool _initiate_conc_mark_if_possible; |
| 342 | 761 |
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762 // If initiate_conc_mark_if_possible() is set at the beginning of a |
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763 // pause, it is a suggestion that the pause should start a marking |
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764 // cycle by doing the initial-mark work. However, it is possible |
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765 // that the concurrent marking thread is still finishing up the |
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766 // previous marking cycle (e.g., clearing the next marking |
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767 // bitmap). If that is the case we cannot start a new cycle and |
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768 // we'll have to wait for the concurrent marking thread to finish |
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769 // what it is doing. In this case we will postpone the marking cycle |
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770 // initiation decision for the next pause. When we eventually decide |
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771 // to start a cycle, we will set _during_initial_mark_pause which |
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772 // will stay true until the end of the initial-mark pause and it's |
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773 // the condition that indicates that a pause is doing the |
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774 // initial-mark work. |
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775 volatile bool _during_initial_mark_pause; |
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776 |
| 342 | 777 bool _should_revert_to_full_young_gcs; |
| 778 bool _last_full_young_gc; | |
| 779 | |
| 780 // This set of variables tracks the collector efficiency, in order to | |
| 781 // determine whether we should initiate a new marking. | |
| 782 double _cur_mark_stop_world_time_ms; | |
| 783 double _mark_init_start_sec; | |
| 784 double _mark_remark_start_sec; | |
| 785 double _mark_cleanup_start_sec; | |
| 786 double _mark_closure_time_ms; | |
| 787 | |
| 788 void calculate_young_list_min_length(); | |
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789 void calculate_young_list_target_length(); |
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790 void calculate_young_list_target_length(size_t rs_lengths); |
| 342 | 791 |
| 792 public: | |
| 793 | |
| 794 G1CollectorPolicy(); | |
| 795 | |
| 796 virtual G1CollectorPolicy* as_g1_policy() { return this; } | |
| 797 | |
| 798 virtual CollectorPolicy::Name kind() { | |
| 799 return CollectorPolicy::G1CollectorPolicyKind; | |
| 800 } | |
| 801 | |
| 802 void check_prediction_validity(); | |
| 803 | |
| 804 size_t bytes_in_collection_set() { | |
| 805 return _bytes_in_collection_set_before_gc; | |
| 806 } | |
| 807 | |
| 808 size_t bytes_in_to_space() { | |
| 809 return bytes_in_to_space_during_gc(); | |
| 810 } | |
| 811 | |
| 812 unsigned calc_gc_alloc_time_stamp() { | |
| 813 return _all_pause_times_ms->num() + 1; | |
| 814 } | |
| 815 | |
| 816 protected: | |
| 817 | |
| 818 // Count the number of bytes used in the CS. | |
| 819 void count_CS_bytes_used(); | |
| 820 | |
| 821 // Together these do the base cleanup-recording work. Subclasses might | |
| 822 // want to put something between them. | |
| 823 void record_concurrent_mark_cleanup_end_work1(size_t freed_bytes, | |
| 824 size_t max_live_bytes); | |
| 825 void record_concurrent_mark_cleanup_end_work2(); | |
| 826 | |
| 827 public: | |
| 828 | |
| 829 virtual void init(); | |
| 830 | |
| 545 | 831 // Create jstat counters for the policy. |
| 832 virtual void initialize_gc_policy_counters(); | |
| 833 | |
| 342 | 834 virtual HeapWord* mem_allocate_work(size_t size, |
| 835 bool is_tlab, | |
| 836 bool* gc_overhead_limit_was_exceeded); | |
| 837 | |
| 838 // This method controls how a collector handles one or more | |
| 839 // of its generations being fully allocated. | |
| 840 virtual HeapWord* satisfy_failed_allocation(size_t size, | |
| 841 bool is_tlab); | |
| 842 | |
| 843 BarrierSet::Name barrier_set_name() { return BarrierSet::G1SATBCTLogging; } | |
| 844 | |
| 845 GenRemSet::Name rem_set_name() { return GenRemSet::CardTable; } | |
| 846 | |
| 847 // The number of collection pauses so far. | |
| 848 long n_pauses() const { return _n_pauses; } | |
| 849 | |
| 850 // Update the heuristic info to record a collection pause of the given | |
| 851 // start time, where the given number of bytes were used at the start. | |
| 852 // This may involve changing the desired size of a collection set. | |
| 853 | |
| 854 virtual void record_stop_world_start(); | |
| 855 | |
| 856 virtual void record_collection_pause_start(double start_time_sec, | |
| 857 size_t start_used); | |
| 858 | |
| 859 // Must currently be called while the world is stopped. | |
| 860 virtual void record_concurrent_mark_init_start(); | |
| 861 virtual void record_concurrent_mark_init_end(); | |
| 862 void record_concurrent_mark_init_end_pre(double | |
| 863 mark_init_elapsed_time_ms); | |
| 864 | |
| 865 void record_mark_closure_time(double mark_closure_time_ms); | |
| 866 | |
| 867 virtual void record_concurrent_mark_remark_start(); | |
| 868 virtual void record_concurrent_mark_remark_end(); | |
| 869 | |
| 870 virtual void record_concurrent_mark_cleanup_start(); | |
| 871 virtual void record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
| 872 size_t max_live_bytes); | |
| 873 virtual void record_concurrent_mark_cleanup_completed(); | |
| 874 | |
| 875 virtual void record_concurrent_pause(); | |
| 876 virtual void record_concurrent_pause_end(); | |
| 877 | |
| 1707 | 878 virtual void record_collection_pause_end(); |
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879 void print_heap_transition(); |
| 342 | 880 |
| 881 // Record the fact that a full collection occurred. | |
| 882 virtual void record_full_collection_start(); | |
| 883 virtual void record_full_collection_end(); | |
| 884 | |
| 1611 | 885 void record_gc_worker_start_time(int worker_i, double ms) { |
| 886 _par_last_gc_worker_start_times_ms[worker_i] = ms; | |
| 887 } | |
| 888 | |
| 342 | 889 void record_ext_root_scan_time(int worker_i, double ms) { |
| 890 _par_last_ext_root_scan_times_ms[worker_i] = ms; | |
| 891 } | |
| 892 | |
| 893 void record_mark_stack_scan_time(int worker_i, double ms) { | |
| 894 _par_last_mark_stack_scan_times_ms[worker_i] = ms; | |
| 895 } | |
| 896 | |
| 897 void record_satb_drain_time(double ms) { | |
| 898 _cur_satb_drain_time_ms = ms; | |
| 899 _satb_drain_time_set = true; | |
| 900 } | |
| 901 | |
| 902 void record_satb_drain_processed_buffers (int processed_buffers) { | |
| 903 _last_satb_drain_processed_buffers = processed_buffers; | |
| 904 } | |
| 905 | |
| 906 void record_mod_union_time(double ms) { | |
| 907 _all_mod_union_times_ms->add(ms); | |
| 908 } | |
| 909 | |
| 910 void record_update_rs_time(int thread, double ms) { | |
| 911 _par_last_update_rs_times_ms[thread] = ms; | |
| 912 } | |
| 913 | |
| 914 void record_update_rs_processed_buffers (int thread, | |
| 915 double processed_buffers) { | |
| 916 _par_last_update_rs_processed_buffers[thread] = processed_buffers; | |
| 917 } | |
| 918 | |
| 919 void record_scan_rs_time(int thread, double ms) { | |
| 920 _par_last_scan_rs_times_ms[thread] = ms; | |
| 921 } | |
| 922 | |
| 923 void reset_obj_copy_time(int thread) { | |
| 924 _par_last_obj_copy_times_ms[thread] = 0.0; | |
| 925 } | |
| 926 | |
| 927 void reset_obj_copy_time() { | |
| 928 reset_obj_copy_time(0); | |
| 929 } | |
| 930 | |
| 931 void record_obj_copy_time(int thread, double ms) { | |
| 932 _par_last_obj_copy_times_ms[thread] += ms; | |
| 933 } | |
| 934 | |
| 1611 | 935 void record_termination(int thread, double ms, size_t attempts) { |
| 936 _par_last_termination_times_ms[thread] = ms; | |
| 937 _par_last_termination_attempts[thread] = (double) attempts; | |
| 342 | 938 } |
| 939 | |
| 1611 | 940 void record_gc_worker_end_time(int worker_i, double ms) { |
| 941 _par_last_gc_worker_end_times_ms[worker_i] = ms; | |
| 342 | 942 } |
| 943 | |
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944 void record_pause_time_ms(double ms) { |
| 342 | 945 _last_pause_time_ms = ms; |
| 946 } | |
| 947 | |
| 948 void record_clear_ct_time(double ms) { | |
| 949 _cur_clear_ct_time_ms = ms; | |
| 950 } | |
| 951 | |
| 952 void record_par_time(double ms) { | |
| 953 _cur_collection_par_time_ms = ms; | |
| 954 } | |
| 955 | |
| 956 void record_aux_start_time(int i) { | |
| 957 guarantee(i < _aux_num, "should be within range"); | |
| 958 _cur_aux_start_times_ms[i] = os::elapsedTime() * 1000.0; | |
| 959 } | |
| 960 | |
| 961 void record_aux_end_time(int i) { | |
| 962 guarantee(i < _aux_num, "should be within range"); | |
| 963 double ms = os::elapsedTime() * 1000.0 - _cur_aux_start_times_ms[i]; | |
| 964 _cur_aux_times_set[i] = true; | |
| 965 _cur_aux_times_ms[i] += ms; | |
| 966 } | |
| 967 | |
|
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968 #ifndef PRODUCT |
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969 void record_cc_clear_time(double ms) { |
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970 if (_min_clear_cc_time_ms < 0.0 || ms <= _min_clear_cc_time_ms) |
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971 _min_clear_cc_time_ms = ms; |
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972 if (_max_clear_cc_time_ms < 0.0 || ms >= _max_clear_cc_time_ms) |
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973 _max_clear_cc_time_ms = ms; |
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974 _cur_clear_cc_time_ms = ms; |
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975 _cum_clear_cc_time_ms += ms; |
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976 _num_cc_clears++; |
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977 } |
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978 #endif |
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979 |
| 342 | 980 // Record the fact that "bytes" bytes allocated in a region. |
| 981 void record_before_bytes(size_t bytes); | |
| 982 void record_after_bytes(size_t bytes); | |
| 983 | |
| 984 // Choose a new collection set. Marks the chosen regions as being | |
| 985 // "in_collection_set", and links them together. The head and number of | |
| 986 // the collection set are available via access methods. | |
| 1707 | 987 virtual void choose_collection_set(double target_pause_time_ms) = 0; |
| 342 | 988 |
| 989 // The head of the list (via "next_in_collection_set()") representing the | |
| 990 // current collection set. | |
| 991 HeapRegion* collection_set() { return _collection_set; } | |
| 992 | |
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993 void clear_collection_set() { _collection_set = NULL; } |
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994 |
| 342 | 995 // The number of elements in the current collection set. |
| 996 size_t collection_set_size() { return _collection_set_size; } | |
| 997 | |
| 998 // Add "hr" to the CS. | |
| 999 void add_to_collection_set(HeapRegion* hr); | |
| 1000 | |
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1001 // Incremental CSet Support |
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1002 |
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1003 // The head of the incrementally built collection set. |
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1004 HeapRegion* inc_cset_head() { return _inc_cset_head; } |
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1005 |
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1006 // The tail of the incrementally built collection set. |
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1007 HeapRegion* inc_set_tail() { return _inc_cset_tail; } |
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1008 |
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1009 // The number of elements in the incrementally built collection set. |
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1010 size_t inc_cset_size() { return _inc_cset_size; } |
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1011 |
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1012 // Initialize incremental collection set info. |
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1013 void start_incremental_cset_building(); |
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1014 |
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1015 void clear_incremental_cset() { |
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1016 _inc_cset_head = NULL; |
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1017 _inc_cset_tail = NULL; |
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1018 } |
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1019 |
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1020 // Stop adding regions to the incremental collection set |
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1021 void stop_incremental_cset_building() { _inc_cset_build_state = Inactive; } |
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1022 |
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1023 // Add/remove information about hr to the aggregated information |
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1024 // for the incrementally built collection set. |
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1025 void add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length); |
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1026 void remove_from_incremental_cset_info(HeapRegion* hr); |
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1027 |
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1028 // Update information about hr in the aggregated information for |
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1029 // the incrementally built collection set. |
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1030 void update_incremental_cset_info(HeapRegion* hr, size_t new_rs_length); |
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1031 |
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1032 private: |
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1033 // Update the incremental cset information when adding a region |
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1034 // (should not be called directly). |
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1035 void add_region_to_incremental_cset_common(HeapRegion* hr); |
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1036 |
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1037 public: |
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1038 // Add hr to the LHS of the incremental collection set. |
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1039 void add_region_to_incremental_cset_lhs(HeapRegion* hr); |
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1040 |
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1041 // Add hr to the RHS of the incremental collection set. |
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1042 void add_region_to_incremental_cset_rhs(HeapRegion* hr); |
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1043 |
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1044 #ifndef PRODUCT |
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1045 void print_collection_set(HeapRegion* list_head, outputStream* st); |
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1046 #endif // !PRODUCT |
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1047 |
|
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1048 bool initiate_conc_mark_if_possible() { return _initiate_conc_mark_if_possible; } |
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1049 void set_initiate_conc_mark_if_possible() { _initiate_conc_mark_if_possible = true; } |
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1050 void clear_initiate_conc_mark_if_possible() { _initiate_conc_mark_if_possible = false; } |
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1051 |
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1052 bool during_initial_mark_pause() { return _during_initial_mark_pause; } |
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1053 void set_during_initial_mark_pause() { _during_initial_mark_pause = true; } |
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1054 void clear_during_initial_mark_pause(){ _during_initial_mark_pause = false; } |
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1055 |
|
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1056 // This sets the initiate_conc_mark_if_possible() flag to start a |
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1057 // new cycle, as long as we are not already in one. It's best if it |
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1058 // is called during a safepoint when the test whether a cycle is in |
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1059 // progress or not is stable. |
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1060 bool force_initial_mark_if_outside_cycle(); |
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1061 |
|
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1062 // This is called at the very beginning of an evacuation pause (it |
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1063 // has to be the first thing that the pause does). If |
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1064 // initiate_conc_mark_if_possible() is true, and the concurrent |
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1065 // marking thread has completed its work during the previous cycle, |
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1066 // it will set during_initial_mark_pause() to so that the pause does |
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1067 // the initial-mark work and start a marking cycle. |
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1068 void decide_on_conc_mark_initiation(); |
| 342 | 1069 |
| 1070 // If an expansion would be appropriate, because recent GC overhead had | |
| 1071 // exceeded the desired limit, return an amount to expand by. | |
| 1072 virtual size_t expansion_amount(); | |
| 1073 | |
| 1074 // note start of mark thread | |
| 1075 void note_start_of_mark_thread(); | |
| 1076 | |
| 1077 // The marked bytes of the "r" has changed; reclassify it's desirability | |
| 1078 // for marking. Also asserts that "r" is eligible for a CS. | |
| 1079 virtual void note_change_in_marked_bytes(HeapRegion* r) = 0; | |
| 1080 | |
| 1081 #ifndef PRODUCT | |
| 1082 // Check any appropriate marked bytes info, asserting false if | |
| 1083 // something's wrong, else returning "true". | |
| 1084 virtual bool assertMarkedBytesDataOK() = 0; | |
| 1085 #endif | |
| 1086 | |
| 1087 // Print tracing information. | |
| 1088 void print_tracing_info() const; | |
| 1089 | |
| 1090 // Print stats on young survival ratio | |
| 1091 void print_yg_surv_rate_info() const; | |
| 1092 | |
| 545 | 1093 void finished_recalculating_age_indexes(bool is_survivors) { |
| 1094 if (is_survivors) { | |
| 1095 _survivor_surv_rate_group->finished_recalculating_age_indexes(); | |
| 1096 } else { | |
| 1097 _short_lived_surv_rate_group->finished_recalculating_age_indexes(); | |
| 1098 } | |
| 342 | 1099 // do that for any other surv rate groups |
| 1100 } | |
| 1101 | |
| 1973 | 1102 bool is_young_list_full() { |
| 1103 size_t young_list_length = _g1->young_list()->length(); | |
|
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1104 size_t young_list_target_length = _young_list_target_length; |
|
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1105 if (G1FixedEdenSize) { |
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1106 young_list_target_length -= _max_survivor_regions; |
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1107 } |
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1108 return young_list_length >= young_list_target_length; |
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1109 } |
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1110 |
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1111 bool can_expand_young_list() { |
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1112 size_t young_list_length = _g1->young_list()->length(); |
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1113 size_t young_list_max_length = _young_list_max_length; |
| 1973 | 1114 if (G1FixedEdenSize) { |
| 1115 young_list_max_length -= _max_survivor_regions; | |
| 1116 } | |
|
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1117 return young_list_length < young_list_max_length; |
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1118 } |
| 1973 | 1119 |
| 1120 void update_region_num(bool young); | |
| 342 | 1121 |
| 1122 bool in_young_gc_mode() { | |
| 1123 return _in_young_gc_mode; | |
| 1124 } | |
| 1125 void set_in_young_gc_mode(bool in_young_gc_mode) { | |
| 1126 _in_young_gc_mode = in_young_gc_mode; | |
| 1127 } | |
| 1128 | |
| 1129 bool full_young_gcs() { | |
| 1130 return _full_young_gcs; | |
| 1131 } | |
| 1132 void set_full_young_gcs(bool full_young_gcs) { | |
| 1133 _full_young_gcs = full_young_gcs; | |
| 1134 } | |
| 1135 | |
| 1136 bool adaptive_young_list_length() { | |
| 1137 return _adaptive_young_list_length; | |
| 1138 } | |
| 1139 void set_adaptive_young_list_length(bool adaptive_young_list_length) { | |
| 1140 _adaptive_young_list_length = adaptive_young_list_length; | |
| 1141 } | |
| 1142 | |
| 1143 inline double get_gc_eff_factor() { | |
| 1144 double ratio = _known_garbage_ratio; | |
| 1145 | |
| 1146 double square = ratio * ratio; | |
| 1147 // square = square * square; | |
| 1148 double ret = square * 9.0 + 1.0; | |
| 1149 #if 0 | |
| 1150 gclog_or_tty->print_cr("ratio = %1.2lf, ret = %1.2lf", ratio, ret); | |
| 1151 #endif // 0 | |
| 1152 guarantee(0.0 <= ret && ret < 10.0, "invariant!"); | |
| 1153 return ret; | |
| 1154 } | |
| 1155 | |
| 1156 // | |
| 1157 // Survivor regions policy. | |
| 1158 // | |
| 1159 protected: | |
| 1160 | |
| 1161 // Current tenuring threshold, set to 0 if the collector reaches the | |
| 1162 // maximum amount of suvivors regions. | |
| 1163 int _tenuring_threshold; | |
| 1164 | |
| 545 | 1165 // The limit on the number of regions allocated for survivors. |
| 1166 size_t _max_survivor_regions; | |
| 1167 | |
|
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1168 // For reporting purposes. |
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1169 size_t _eden_bytes_before_gc; |
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1170 size_t _survivor_bytes_before_gc; |
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1171 size_t _capacity_before_gc; |
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1172 |
| 545 | 1173 // The amount of survor regions after a collection. |
| 1174 size_t _recorded_survivor_regions; | |
| 1175 // List of survivor regions. | |
| 1176 HeapRegion* _recorded_survivor_head; | |
| 1177 HeapRegion* _recorded_survivor_tail; | |
| 1178 | |
| 1179 ageTable _survivors_age_table; | |
| 1180 | |
| 342 | 1181 public: |
| 1182 | |
| 1183 inline GCAllocPurpose | |
| 1184 evacuation_destination(HeapRegion* src_region, int age, size_t word_sz) { | |
| 1185 if (age < _tenuring_threshold && src_region->is_young()) { | |
| 1186 return GCAllocForSurvived; | |
| 1187 } else { | |
| 1188 return GCAllocForTenured; | |
| 1189 } | |
| 1190 } | |
| 1191 | |
| 1192 inline bool track_object_age(GCAllocPurpose purpose) { | |
| 1193 return purpose == GCAllocForSurvived; | |
| 1194 } | |
| 1195 | |
| 1196 inline GCAllocPurpose alternative_purpose(int purpose) { | |
| 1197 return GCAllocForTenured; | |
| 1198 } | |
| 1199 | |
| 545 | 1200 static const size_t REGIONS_UNLIMITED = ~(size_t)0; |
| 1201 | |
| 1202 size_t max_regions(int purpose); | |
| 342 | 1203 |
| 1204 // The limit on regions for a particular purpose is reached. | |
| 1205 void note_alloc_region_limit_reached(int purpose) { | |
| 1206 if (purpose == GCAllocForSurvived) { | |
| 1207 _tenuring_threshold = 0; | |
| 1208 } | |
| 1209 } | |
| 1210 | |
| 1211 void note_start_adding_survivor_regions() { | |
| 1212 _survivor_surv_rate_group->start_adding_regions(); | |
| 1213 } | |
| 1214 | |
| 1215 void note_stop_adding_survivor_regions() { | |
| 1216 _survivor_surv_rate_group->stop_adding_regions(); | |
| 1217 } | |
| 545 | 1218 |
| 1219 void record_survivor_regions(size_t regions, | |
| 1220 HeapRegion* head, | |
| 1221 HeapRegion* tail) { | |
| 1222 _recorded_survivor_regions = regions; | |
| 1223 _recorded_survivor_head = head; | |
| 1224 _recorded_survivor_tail = tail; | |
| 1225 } | |
| 1226 | |
|
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1227 size_t recorded_survivor_regions() { |
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1228 return _recorded_survivor_regions; |
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1229 } |
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1230 |
| 545 | 1231 void record_thread_age_table(ageTable* age_table) |
| 1232 { | |
| 1233 _survivors_age_table.merge_par(age_table); | |
| 1234 } | |
| 1235 | |
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1236 void calculate_max_gc_locker_expansion(); |
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1237 |
| 545 | 1238 // Calculates survivor space parameters. |
| 1239 void calculate_survivors_policy(); | |
| 1240 | |
| 342 | 1241 }; |
| 1242 | |
| 1243 // This encapsulates a particular strategy for a g1 Collector. | |
| 1244 // | |
| 1245 // Start a concurrent mark when our heap size is n bytes | |
| 1246 // greater then our heap size was at the last concurrent | |
| 1247 // mark. Where n is a function of the CMSTriggerRatio | |
| 1248 // and the MinHeapFreeRatio. | |
| 1249 // | |
| 1250 // Start a g1 collection pause when we have allocated the | |
| 1251 // average number of bytes currently being freed in | |
| 1252 // a collection, but only if it is at least one region | |
| 1253 // full | |
| 1254 // | |
| 1255 // Resize Heap based on desired | |
| 1256 // allocation space, where desired allocation space is | |
| 1257 // a function of survival rate and desired future to size. | |
| 1258 // | |
| 1259 // Choose collection set by first picking all older regions | |
| 1260 // which have a survival rate which beats our projected young | |
| 1261 // survival rate. Then fill out the number of needed regions | |
| 1262 // with young regions. | |
| 1263 | |
| 1264 class G1CollectorPolicy_BestRegionsFirst: public G1CollectorPolicy { | |
| 1265 CollectionSetChooser* _collectionSetChooser; | |
| 1266 // If the estimated is less then desirable, resize if possible. | |
| 1267 void expand_if_possible(size_t numRegions); | |
| 1268 | |
| 1707 | 1269 virtual void choose_collection_set(double target_pause_time_ms); |
| 342 | 1270 virtual void record_collection_pause_start(double start_time_sec, |
| 1271 size_t start_used); | |
| 1272 virtual void record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
| 1273 size_t max_live_bytes); | |
| 1274 virtual void record_full_collection_end(); | |
| 1275 | |
| 1276 public: | |
| 1277 G1CollectorPolicy_BestRegionsFirst() { | |
| 1278 _collectionSetChooser = new CollectionSetChooser(); | |
| 1279 } | |
| 1707 | 1280 void record_collection_pause_end(); |
| 342 | 1281 // This is not needed any more, after the CSet choosing code was |
| 1282 // changed to use the pause prediction work. But let's leave the | |
| 1283 // hook in just in case. | |
| 1284 void note_change_in_marked_bytes(HeapRegion* r) { } | |
| 1285 #ifndef PRODUCT | |
| 1286 bool assertMarkedBytesDataOK(); | |
| 1287 #endif | |
| 1288 }; | |
| 1289 | |
| 1290 // This should move to some place more general... | |
| 1291 | |
| 1292 // If we have "n" measurements, and we've kept track of their "sum" and the | |
| 1293 // "sum_of_squares" of the measurements, this returns the variance of the | |
| 1294 // sequence. | |
| 1295 inline double variance(int n, double sum_of_squares, double sum) { | |
| 1296 double n_d = (double)n; | |
| 1297 double avg = sum/n_d; | |
| 1298 return (sum_of_squares - 2.0 * avg * sum + n_d * avg * avg) / n_d; | |
| 1299 } | |
| 1300 | |
| 1301 // Local Variables: *** | |
| 1302 // c-indentation-style: gnu *** | |
| 1303 // End: *** | |
| 1972 | 1304 |
| 1305 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTORPOLICY_HPP |