Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.hpp @ 4013:074f0252cc13
7088680: G1: Cleanup in the G1CollectorPolicy class
Summary: Removed unused fields and methods, removed the G1CollectoryPolicy_BestRegionsFirst class and folded its functionality into the G1CollectorPolicy class.
Reviewed-by: ysr, brutisso, jcoomes
| author | tonyp |
|---|---|
| date | Fri, 14 Oct 2011 11:12:24 -0400 |
| parents | 8229bd737950 |
| children | c6a6e936dc68 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2011, 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 { | |
| 4013 | 87 private: |
| 342 | 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 | |
| 4013 | 109 CollectionSetChooser* _collectionSetChooser; |
| 342 | 110 |
| 111 double _cur_collection_start_sec; | |
| 112 size_t _cur_collection_pause_used_at_start_bytes; | |
| 113 size_t _cur_collection_pause_used_regions_at_start; | |
| 114 size_t _prev_collection_pause_used_at_end_bytes; | |
| 115 double _cur_collection_par_time_ms; | |
| 116 double _cur_satb_drain_time_ms; | |
| 117 double _cur_clear_ct_time_ms; | |
| 118 bool _satb_drain_time_set; | |
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119 double _cur_ref_proc_time_ms; |
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120 double _cur_ref_enq_time_ms; |
| 342 | 121 |
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122 #ifndef PRODUCT |
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123 // Card Table Count Cache stats |
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124 double _min_clear_cc_time_ms; // min |
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125 double _max_clear_cc_time_ms; // max |
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126 double _cur_clear_cc_time_ms; // clearing time during current pause |
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127 double _cum_clear_cc_time_ms; // cummulative clearing time |
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128 jlong _num_cc_clears; // number of times the card count cache has been cleared |
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129 #endif |
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130 |
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131 // Statistics for recent GC pauses. See below for how indexed. |
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132 TruncatedSeq* _recent_rs_scan_times_ms; |
| 342 | 133 |
| 134 // These exclude marking times. | |
| 135 TruncatedSeq* _recent_pause_times_ms; | |
| 136 TruncatedSeq* _recent_gc_times_ms; | |
| 137 | |
| 138 TruncatedSeq* _recent_CS_bytes_used_before; | |
| 139 TruncatedSeq* _recent_CS_bytes_surviving; | |
| 140 | |
| 141 TruncatedSeq* _recent_rs_sizes; | |
| 142 | |
| 143 TruncatedSeq* _concurrent_mark_remark_times_ms; | |
| 144 TruncatedSeq* _concurrent_mark_cleanup_times_ms; | |
| 145 | |
| 677 | 146 Summary* _summary; |
| 342 | 147 |
| 148 NumberSeq* _all_pause_times_ms; | |
| 149 NumberSeq* _all_full_gc_times_ms; | |
| 150 double _stop_world_start; | |
| 151 NumberSeq* _all_stop_world_times_ms; | |
| 152 NumberSeq* _all_yield_times_ms; | |
| 153 | |
| 154 size_t _region_num_young; | |
| 155 size_t _region_num_tenured; | |
| 156 size_t _prev_region_num_young; | |
| 157 size_t _prev_region_num_tenured; | |
| 158 | |
| 159 NumberSeq* _all_mod_union_times_ms; | |
| 160 | |
| 161 int _aux_num; | |
| 162 NumberSeq* _all_aux_times_ms; | |
| 163 double* _cur_aux_start_times_ms; | |
| 164 double* _cur_aux_times_ms; | |
| 165 bool* _cur_aux_times_set; | |
| 166 | |
| 1611 | 167 double* _par_last_gc_worker_start_times_ms; |
| 342 | 168 double* _par_last_ext_root_scan_times_ms; |
| 169 double* _par_last_mark_stack_scan_times_ms; | |
| 170 double* _par_last_update_rs_times_ms; | |
| 171 double* _par_last_update_rs_processed_buffers; | |
| 172 double* _par_last_scan_rs_times_ms; | |
| 173 double* _par_last_obj_copy_times_ms; | |
| 174 double* _par_last_termination_times_ms; | |
| 1611 | 175 double* _par_last_termination_attempts; |
| 176 double* _par_last_gc_worker_end_times_ms; | |
| 2430 | 177 double* _par_last_gc_worker_times_ms; |
| 342 | 178 |
| 179 // indicates whether we are in full young or partially young GC mode | |
| 180 bool _full_young_gcs; | |
| 181 | |
| 182 // if true, then it tries to dynamically adjust the length of the | |
| 183 // young list | |
| 184 bool _adaptive_young_list_length; | |
| 185 size_t _young_list_target_length; | |
| 186 size_t _young_list_fixed_length; | |
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187 size_t _prev_eden_capacity; // used for logging |
| 342 | 188 |
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189 // The max number of regions we can extend the eden by while the GC |
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190 // locker is active. This should be >= _young_list_target_length; |
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191 size_t _young_list_max_length; |
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192 |
| 342 | 193 size_t _young_cset_length; |
| 194 bool _last_young_gc_full; | |
| 195 | |
| 196 unsigned _full_young_pause_num; | |
| 197 unsigned _partial_young_pause_num; | |
| 198 | |
| 199 bool _during_marking; | |
| 200 bool _in_marking_window; | |
| 201 bool _in_marking_window_im; | |
| 202 | |
| 203 SurvRateGroup* _short_lived_surv_rate_group; | |
| 204 SurvRateGroup* _survivor_surv_rate_group; | |
| 205 // add here any more surv rate groups | |
| 206 | |
| 1356 | 207 double _gc_overhead_perc; |
| 208 | |
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209 double _reserve_factor; |
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210 size_t _reserve_regions; |
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211 |
| 342 | 212 bool during_marking() { |
| 213 return _during_marking; | |
| 214 } | |
| 215 | |
| 216 // <NEW PREDICTION> | |
| 217 | |
| 218 private: | |
| 219 enum PredictionConstants { | |
| 220 TruncatedSeqLength = 10 | |
| 221 }; | |
| 222 | |
| 223 TruncatedSeq* _alloc_rate_ms_seq; | |
| 224 double _prev_collection_pause_end_ms; | |
| 225 | |
| 226 TruncatedSeq* _pending_card_diff_seq; | |
| 227 TruncatedSeq* _rs_length_diff_seq; | |
| 228 TruncatedSeq* _cost_per_card_ms_seq; | |
| 229 TruncatedSeq* _fully_young_cards_per_entry_ratio_seq; | |
| 230 TruncatedSeq* _partially_young_cards_per_entry_ratio_seq; | |
| 231 TruncatedSeq* _cost_per_entry_ms_seq; | |
| 232 TruncatedSeq* _partially_young_cost_per_entry_ms_seq; | |
| 233 TruncatedSeq* _cost_per_byte_ms_seq; | |
| 234 TruncatedSeq* _constant_other_time_ms_seq; | |
| 235 TruncatedSeq* _young_other_cost_per_region_ms_seq; | |
| 236 TruncatedSeq* _non_young_other_cost_per_region_ms_seq; | |
| 237 | |
| 238 TruncatedSeq* _pending_cards_seq; | |
| 239 TruncatedSeq* _scanned_cards_seq; | |
| 240 TruncatedSeq* _rs_lengths_seq; | |
| 241 | |
| 242 TruncatedSeq* _cost_per_byte_ms_during_cm_seq; | |
| 243 | |
| 244 TruncatedSeq* _young_gc_eff_seq; | |
| 245 | |
| 246 TruncatedSeq* _max_conc_overhead_seq; | |
| 247 | |
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248 bool _using_new_ratio_calculations; |
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249 size_t _min_desired_young_length; // as set on the command line or default calculations |
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250 size_t _max_desired_young_length; // as set on the command line or default calculations |
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251 |
| 342 | 252 size_t _recorded_young_regions; |
| 253 size_t _recorded_non_young_regions; | |
| 254 size_t _recorded_region_num; | |
| 255 | |
| 256 size_t _free_regions_at_end_of_collection; | |
| 257 | |
| 258 size_t _recorded_rs_lengths; | |
| 259 size_t _max_rs_lengths; | |
| 260 | |
| 261 size_t _recorded_marked_bytes; | |
| 262 size_t _recorded_young_bytes; | |
| 263 | |
| 264 size_t _predicted_pending_cards; | |
| 265 size_t _predicted_cards_scanned; | |
| 266 size_t _predicted_rs_lengths; | |
| 267 size_t _predicted_bytes_to_copy; | |
| 268 | |
| 269 double _predicted_survival_ratio; | |
| 270 double _predicted_rs_update_time_ms; | |
| 271 double _predicted_rs_scan_time_ms; | |
| 272 double _predicted_object_copy_time_ms; | |
| 273 double _predicted_constant_other_time_ms; | |
| 274 double _predicted_young_other_time_ms; | |
| 275 double _predicted_non_young_other_time_ms; | |
| 276 double _predicted_pause_time_ms; | |
| 277 | |
| 278 double _vtime_diff_ms; | |
| 279 | |
| 280 double _recorded_young_free_cset_time_ms; | |
| 281 double _recorded_non_young_free_cset_time_ms; | |
| 282 | |
| 283 double _sigma; | |
| 284 double _expensive_region_limit_ms; | |
| 285 | |
| 286 size_t _rs_lengths_prediction; | |
| 287 | |
| 288 size_t _known_garbage_bytes; | |
| 289 double _known_garbage_ratio; | |
| 290 | |
| 291 double sigma() { | |
| 292 return _sigma; | |
| 293 } | |
| 294 | |
| 295 // A function that prevents us putting too much stock in small sample | |
| 296 // sets. Returns a number between 2.0 and 1.0, depending on the number | |
| 297 // of samples. 5 or more samples yields one; fewer scales linearly from | |
| 298 // 2.0 at 1 sample to 1.0 at 5. | |
| 299 double confidence_factor(int samples) { | |
| 300 if (samples > 4) return 1.0; | |
| 301 else return 1.0 + sigma() * ((double)(5 - samples))/2.0; | |
| 302 } | |
| 303 | |
| 304 double get_new_neg_prediction(TruncatedSeq* seq) { | |
| 305 return seq->davg() - sigma() * seq->dsd(); | |
| 306 } | |
| 307 | |
| 308 #ifndef PRODUCT | |
| 309 bool verify_young_ages(HeapRegion* head, SurvRateGroup *surv_rate_group); | |
| 310 #endif // PRODUCT | |
| 311 | |
| 1111 | 312 void adjust_concurrent_refinement(double update_rs_time, |
| 313 double update_rs_processed_buffers, | |
| 314 double goal_ms); | |
| 315 | |
| 342 | 316 double _pause_time_target_ms; |
| 317 double _recorded_young_cset_choice_time_ms; | |
| 318 double _recorded_non_young_cset_choice_time_ms; | |
| 319 bool _within_target; | |
| 320 size_t _pending_cards; | |
| 321 size_t _max_pending_cards; | |
| 322 | |
| 323 public: | |
| 324 | |
| 325 void set_region_short_lived(HeapRegion* hr) { | |
| 326 hr->install_surv_rate_group(_short_lived_surv_rate_group); | |
| 327 } | |
| 328 | |
| 329 void set_region_survivors(HeapRegion* hr) { | |
| 330 hr->install_surv_rate_group(_survivor_surv_rate_group); | |
| 331 } | |
| 332 | |
| 333 #ifndef PRODUCT | |
| 334 bool verify_young_ages(); | |
| 335 #endif // PRODUCT | |
| 336 | |
| 337 double get_new_prediction(TruncatedSeq* seq) { | |
| 338 return MAX2(seq->davg() + sigma() * seq->dsd(), | |
| 339 seq->davg() * confidence_factor(seq->num())); | |
| 340 } | |
| 341 | |
| 342 size_t young_cset_length() { | |
| 343 return _young_cset_length; | |
| 344 } | |
| 345 | |
| 346 void record_max_rs_lengths(size_t rs_lengths) { | |
| 347 _max_rs_lengths = rs_lengths; | |
| 348 } | |
| 349 | |
| 350 size_t predict_pending_card_diff() { | |
| 351 double prediction = get_new_neg_prediction(_pending_card_diff_seq); | |
| 352 if (prediction < 0.00001) | |
| 353 return 0; | |
| 354 else | |
| 355 return (size_t) prediction; | |
| 356 } | |
| 357 | |
| 358 size_t predict_pending_cards() { | |
| 359 size_t max_pending_card_num = _g1->max_pending_card_num(); | |
| 360 size_t diff = predict_pending_card_diff(); | |
| 361 size_t prediction; | |
| 362 if (diff > max_pending_card_num) | |
| 363 prediction = max_pending_card_num; | |
| 364 else | |
| 365 prediction = max_pending_card_num - diff; | |
| 366 | |
| 367 return prediction; | |
| 368 } | |
| 369 | |
| 370 size_t predict_rs_length_diff() { | |
| 371 return (size_t) get_new_prediction(_rs_length_diff_seq); | |
| 372 } | |
| 373 | |
| 374 double predict_alloc_rate_ms() { | |
| 375 return get_new_prediction(_alloc_rate_ms_seq); | |
| 376 } | |
| 377 | |
| 378 double predict_cost_per_card_ms() { | |
| 379 return get_new_prediction(_cost_per_card_ms_seq); | |
| 380 } | |
| 381 | |
| 382 double predict_rs_update_time_ms(size_t pending_cards) { | |
| 383 return (double) pending_cards * predict_cost_per_card_ms(); | |
| 384 } | |
| 385 | |
| 386 double predict_fully_young_cards_per_entry_ratio() { | |
| 387 return get_new_prediction(_fully_young_cards_per_entry_ratio_seq); | |
| 388 } | |
| 389 | |
| 390 double predict_partially_young_cards_per_entry_ratio() { | |
| 391 if (_partially_young_cards_per_entry_ratio_seq->num() < 2) | |
| 392 return predict_fully_young_cards_per_entry_ratio(); | |
| 393 else | |
| 394 return get_new_prediction(_partially_young_cards_per_entry_ratio_seq); | |
| 395 } | |
| 396 | |
| 397 size_t predict_young_card_num(size_t rs_length) { | |
| 398 return (size_t) ((double) rs_length * | |
| 399 predict_fully_young_cards_per_entry_ratio()); | |
| 400 } | |
| 401 | |
| 402 size_t predict_non_young_card_num(size_t rs_length) { | |
| 403 return (size_t) ((double) rs_length * | |
| 404 predict_partially_young_cards_per_entry_ratio()); | |
| 405 } | |
| 406 | |
| 407 double predict_rs_scan_time_ms(size_t card_num) { | |
| 408 if (full_young_gcs()) | |
| 409 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); | |
| 410 else | |
| 411 return predict_partially_young_rs_scan_time_ms(card_num); | |
| 412 } | |
| 413 | |
| 414 double predict_partially_young_rs_scan_time_ms(size_t card_num) { | |
| 415 if (_partially_young_cost_per_entry_ms_seq->num() < 3) | |
| 416 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); | |
| 417 else | |
| 418 return (double) card_num * | |
| 419 get_new_prediction(_partially_young_cost_per_entry_ms_seq); | |
| 420 } | |
| 421 | |
| 422 double predict_object_copy_time_ms_during_cm(size_t bytes_to_copy) { | |
| 423 if (_cost_per_byte_ms_during_cm_seq->num() < 3) | |
| 424 return 1.1 * (double) bytes_to_copy * | |
| 425 get_new_prediction(_cost_per_byte_ms_seq); | |
| 426 else | |
| 427 return (double) bytes_to_copy * | |
| 428 get_new_prediction(_cost_per_byte_ms_during_cm_seq); | |
| 429 } | |
| 430 | |
| 431 double predict_object_copy_time_ms(size_t bytes_to_copy) { | |
| 432 if (_in_marking_window && !_in_marking_window_im) | |
| 433 return predict_object_copy_time_ms_during_cm(bytes_to_copy); | |
| 434 else | |
| 435 return (double) bytes_to_copy * | |
| 436 get_new_prediction(_cost_per_byte_ms_seq); | |
| 437 } | |
| 438 | |
| 439 double predict_constant_other_time_ms() { | |
| 440 return get_new_prediction(_constant_other_time_ms_seq); | |
| 441 } | |
| 442 | |
| 443 double predict_young_other_time_ms(size_t young_num) { | |
| 444 return | |
| 445 (double) young_num * | |
| 446 get_new_prediction(_young_other_cost_per_region_ms_seq); | |
| 447 } | |
| 448 | |
| 449 double predict_non_young_other_time_ms(size_t non_young_num) { | |
| 450 return | |
| 451 (double) non_young_num * | |
| 452 get_new_prediction(_non_young_other_cost_per_region_ms_seq); | |
| 453 } | |
| 454 | |
| 455 void check_if_region_is_too_expensive(double predicted_time_ms); | |
| 456 | |
| 457 double predict_young_collection_elapsed_time_ms(size_t adjustment); | |
| 458 double predict_base_elapsed_time_ms(size_t pending_cards); | |
| 459 double predict_base_elapsed_time_ms(size_t pending_cards, | |
| 460 size_t scanned_cards); | |
| 461 size_t predict_bytes_to_copy(HeapRegion* hr); | |
| 462 double predict_region_elapsed_time_ms(HeapRegion* hr, bool young); | |
| 463 | |
| 464 void start_recording_regions(); | |
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465 void record_cset_region_info(HeapRegion* hr, bool young); |
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466 void record_non_young_cset_region(HeapRegion* hr); |
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467 |
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468 void set_recorded_young_regions(size_t n_regions); |
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469 void set_recorded_young_bytes(size_t bytes); |
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470 void set_recorded_rs_lengths(size_t rs_lengths); |
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471 void set_predicted_bytes_to_copy(size_t bytes); |
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472 |
| 342 | 473 void end_recording_regions(); |
| 474 | |
| 475 void record_vtime_diff_ms(double vtime_diff_ms) { | |
| 476 _vtime_diff_ms = vtime_diff_ms; | |
| 477 } | |
| 478 | |
| 479 void record_young_free_cset_time_ms(double time_ms) { | |
| 480 _recorded_young_free_cset_time_ms = time_ms; | |
| 481 } | |
| 482 | |
| 483 void record_non_young_free_cset_time_ms(double time_ms) { | |
| 484 _recorded_non_young_free_cset_time_ms = time_ms; | |
| 485 } | |
| 486 | |
| 487 double predict_young_gc_eff() { | |
| 488 return get_new_neg_prediction(_young_gc_eff_seq); | |
| 489 } | |
| 490 | |
| 545 | 491 double predict_survivor_regions_evac_time(); |
| 492 | |
| 342 | 493 // </NEW PREDICTION> |
| 494 | |
| 495 void cset_regions_freed() { | |
| 496 bool propagate = _last_young_gc_full && !_in_marking_window; | |
| 497 _short_lived_surv_rate_group->all_surviving_words_recorded(propagate); | |
| 498 _survivor_surv_rate_group->all_surviving_words_recorded(propagate); | |
| 499 // also call it on any more surv rate groups | |
| 500 } | |
| 501 | |
| 502 void set_known_garbage_bytes(size_t known_garbage_bytes) { | |
| 503 _known_garbage_bytes = known_garbage_bytes; | |
| 504 size_t heap_bytes = _g1->capacity(); | |
| 505 _known_garbage_ratio = (double) _known_garbage_bytes / (double) heap_bytes; | |
| 506 } | |
| 507 | |
| 508 void decrease_known_garbage_bytes(size_t known_garbage_bytes) { | |
| 509 guarantee( _known_garbage_bytes >= known_garbage_bytes, "invariant" ); | |
| 510 | |
| 511 _known_garbage_bytes -= known_garbage_bytes; | |
| 512 size_t heap_bytes = _g1->capacity(); | |
| 513 _known_garbage_ratio = (double) _known_garbage_bytes / (double) heap_bytes; | |
| 514 } | |
| 515 | |
| 516 G1MMUTracker* mmu_tracker() { | |
| 517 return _mmu_tracker; | |
| 518 } | |
| 519 | |
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520 double max_pause_time_ms() { |
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521 return _mmu_tracker->max_gc_time() * 1000.0; |
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522 } |
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523 |
| 342 | 524 double predict_remark_time_ms() { |
| 525 return get_new_prediction(_concurrent_mark_remark_times_ms); | |
| 526 } | |
| 527 | |
| 528 double predict_cleanup_time_ms() { | |
| 529 return get_new_prediction(_concurrent_mark_cleanup_times_ms); | |
| 530 } | |
| 531 | |
| 532 // Returns an estimate of the survival rate of the region at yg-age | |
| 533 // "yg_age". | |
| 545 | 534 double predict_yg_surv_rate(int age, SurvRateGroup* surv_rate_group) { |
| 535 TruncatedSeq* seq = surv_rate_group->get_seq(age); | |
| 342 | 536 if (seq->num() == 0) |
| 537 gclog_or_tty->print("BARF! age is %d", age); | |
| 538 guarantee( seq->num() > 0, "invariant" ); | |
| 539 double pred = get_new_prediction(seq); | |
| 540 if (pred > 1.0) | |
| 541 pred = 1.0; | |
| 542 return pred; | |
| 543 } | |
| 544 | |
| 545 | 545 double predict_yg_surv_rate(int age) { |
| 546 return predict_yg_surv_rate(age, _short_lived_surv_rate_group); | |
| 547 } | |
| 548 | |
| 342 | 549 double accum_yg_surv_rate_pred(int age) { |
| 550 return _short_lived_surv_rate_group->accum_surv_rate_pred(age); | |
| 551 } | |
| 552 | |
| 4013 | 553 private: |
| 1611 | 554 void print_stats(int level, const char* str, double value); |
| 555 void print_stats(int level, const char* str, int value); | |
| 556 | |
| 2430 | 557 void print_par_stats(int level, const char* str, double* data); |
| 558 void print_par_sizes(int level, const char* str, double* data); | |
| 342 | 559 |
| 560 void check_other_times(int level, | |
| 561 NumberSeq* other_times_ms, | |
| 562 NumberSeq* calc_other_times_ms) const; | |
| 563 | |
| 564 void print_summary (PauseSummary* stats) const; | |
| 565 | |
| 566 void print_summary (int level, const char* str, NumberSeq* seq) const; | |
| 567 void print_summary_sd (int level, const char* str, NumberSeq* seq) const; | |
| 568 | |
| 569 double avg_value (double* data); | |
| 570 double max_value (double* data); | |
| 571 double sum_of_values (double* data); | |
| 572 double max_sum (double* data1, double* data2); | |
| 573 | |
| 574 int _last_satb_drain_processed_buffers; | |
| 575 int _last_update_rs_processed_buffers; | |
| 576 double _last_pause_time_ms; | |
| 577 | |
| 578 size_t _bytes_in_collection_set_before_gc; | |
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579 size_t _bytes_copied_during_gc; |
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580 |
| 342 | 581 // Used to count used bytes in CS. |
| 582 friend class CountCSClosure; | |
| 583 | |
| 584 // Statistics kept per GC stoppage, pause or full. | |
| 585 TruncatedSeq* _recent_prev_end_times_for_all_gcs_sec; | |
| 586 | |
| 587 // Add a new GC of the given duration and end time to the record. | |
| 588 void update_recent_gc_times(double end_time_sec, double elapsed_ms); | |
| 589 | |
| 590 // The head of the list (via "next_in_collection_set()") representing the | |
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591 // current collection set. Set from the incrementally built collection |
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592 // set at the start of the pause. |
| 342 | 593 HeapRegion* _collection_set; |
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594 |
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595 // The number of regions in the collection set. Set from the incrementally |
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596 // built collection set at the start of an evacuation pause. |
| 342 | 597 size_t _collection_set_size; |
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598 |
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599 // The number of bytes in the collection set before the pause. Set from |
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600 // the incrementally built collection set at the start of an evacuation |
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601 // pause. |
| 342 | 602 size_t _collection_set_bytes_used_before; |
| 603 | |
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604 // The associated information that is maintained while the incremental |
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605 // collection set is being built with young regions. Used to populate |
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606 // the recorded info for the evacuation pause. |
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607 |
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608 enum CSetBuildType { |
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609 Active, // We are actively building the collection set |
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610 Inactive // We are not actively building the collection set |
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611 }; |
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612 |
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613 CSetBuildType _inc_cset_build_state; |
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614 |
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615 // The head of the incrementally built collection set. |
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616 HeapRegion* _inc_cset_head; |
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617 |
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618 // The tail of the incrementally built collection set. |
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619 HeapRegion* _inc_cset_tail; |
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620 |
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621 // The number of regions in the incrementally built collection set. |
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622 // Used to set _collection_set_size at the start of an evacuation |
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623 // pause. |
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624 size_t _inc_cset_size; |
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625 |
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626 // Used as the index in the surving young words structure |
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627 // which tracks the amount of space, for each young region, |
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628 // that survives the pause. |
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629 size_t _inc_cset_young_index; |
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630 |
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631 // The number of bytes in the incrementally built collection set. |
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632 // Used to set _collection_set_bytes_used_before at the start of |
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633 // an evacuation pause. |
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634 size_t _inc_cset_bytes_used_before; |
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635 |
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636 // Used to record the highest end of heap region in collection set |
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637 HeapWord* _inc_cset_max_finger; |
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638 |
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639 // The number of recorded used bytes in the young regions |
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640 // of the collection set. This is the sum of the used() bytes |
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641 // of retired young regions in the collection set. |
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642 size_t _inc_cset_recorded_young_bytes; |
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643 |
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644 // The RSet lengths recorded for regions in the collection set |
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645 // (updated by the periodic sampling of the regions in the |
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646 // young list/collection set). |
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647 size_t _inc_cset_recorded_rs_lengths; |
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648 |
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649 // The predicted elapsed time it will take to collect the regions |
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650 // in the collection set (updated by the periodic sampling of the |
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651 // regions in the young list/collection set). |
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652 double _inc_cset_predicted_elapsed_time_ms; |
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653 |
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654 // The predicted bytes to copy for the regions in the collection |
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655 // set (updated by the periodic sampling of the regions in the |
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656 // young list/collection set). |
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657 size_t _inc_cset_predicted_bytes_to_copy; |
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658 |
| 342 | 659 // Stash a pointer to the g1 heap. |
| 660 G1CollectedHeap* _g1; | |
| 661 | |
| 662 // The average time in ms per collection pause, averaged over recent pauses. | |
| 663 double recent_avg_time_for_pauses_ms(); | |
| 664 | |
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665 // The average time in ms for RS scanning, per pause, averaged |
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666 // over recent pauses. (Note the RS scanning time for a pause |
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667 // is itself an average of the RS scanning time for each worker |
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668 // thread.) |
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|
669 double recent_avg_time_for_rs_scan_ms(); |
| 342 | 670 |
| 671 // The number of "recent" GCs recorded in the number sequences | |
| 672 int number_of_recent_gcs(); | |
| 673 | |
| 674 // The average survival ratio, computed by the total number of bytes | |
| 675 // suriviving / total number of bytes before collection over the last | |
| 676 // several recent pauses. | |
| 677 double recent_avg_survival_fraction(); | |
| 678 // The survival fraction of the most recent pause; if there have been no | |
| 679 // pauses, returns 1.0. | |
| 680 double last_survival_fraction(); | |
| 681 | |
| 682 // Returns a "conservative" estimate of the recent survival rate, i.e., | |
| 683 // one that may be higher than "recent_avg_survival_fraction". | |
| 684 // This is conservative in several ways: | |
| 685 // If there have been few pauses, it will assume a potential high | |
| 686 // variance, and err on the side of caution. | |
| 687 // It puts a lower bound (currently 0.1) on the value it will return. | |
| 688 // To try to detect phase changes, if the most recent pause ("latest") has a | |
| 689 // higher-than average ("avg") survival rate, it returns that rate. | |
| 690 // "work" version is a utility function; young is restricted to young regions. | |
| 691 double conservative_avg_survival_fraction_work(double avg, | |
| 692 double latest); | |
| 693 | |
| 694 // The arguments are the two sequences that keep track of the number of bytes | |
| 695 // surviving and the total number of bytes before collection, resp., | |
| 696 // over the last evereal recent pauses | |
| 697 // Returns the survival rate for the category in the most recent pause. | |
| 698 // If there have been no pauses, returns 1.0. | |
| 699 double last_survival_fraction_work(TruncatedSeq* surviving, | |
| 700 TruncatedSeq* before); | |
| 701 | |
| 702 // The arguments are the two sequences that keep track of the number of bytes | |
| 703 // surviving and the total number of bytes before collection, resp., | |
| 704 // over the last several recent pauses | |
| 705 // Returns the average survival ration over the last several recent pauses | |
| 706 // If there have been no pauses, return 1.0 | |
| 707 double recent_avg_survival_fraction_work(TruncatedSeq* surviving, | |
| 708 TruncatedSeq* before); | |
| 709 | |
| 710 double conservative_avg_survival_fraction() { | |
| 711 double avg = recent_avg_survival_fraction(); | |
| 712 double latest = last_survival_fraction(); | |
| 713 return conservative_avg_survival_fraction_work(avg, latest); | |
| 714 } | |
| 715 | |
| 716 // The ratio of gc time to elapsed time, computed over recent pauses. | |
| 717 double _recent_avg_pause_time_ratio; | |
| 718 | |
| 719 double recent_avg_pause_time_ratio() { | |
| 720 return _recent_avg_pause_time_ratio; | |
| 721 } | |
| 722 | |
| 723 // Number of pauses between concurrent marking. | |
| 724 size_t _pauses_btwn_concurrent_mark; | |
| 725 | |
|
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726 // At the end of a pause we check the heap occupancy and we decide |
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727 // whether we will start a marking cycle during the next pause. If |
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728 // we decide that we want to do that, we will set this parameter to |
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729 // true. So, this parameter will stay true between the end of a |
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730 // pause and the beginning of a subsequent pause (not necessarily |
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731 // the next one, see the comments on the next field) when we decide |
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732 // that we will indeed start a marking cycle and do the initial-mark |
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733 // work. |
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|
734 volatile bool _initiate_conc_mark_if_possible; |
| 342 | 735 |
|
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736 // If initiate_conc_mark_if_possible() is set at the beginning of a |
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737 // pause, it is a suggestion that the pause should start a marking |
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738 // cycle by doing the initial-mark work. However, it is possible |
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739 // that the concurrent marking thread is still finishing up the |
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740 // previous marking cycle (e.g., clearing the next marking |
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741 // bitmap). If that is the case we cannot start a new cycle and |
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742 // we'll have to wait for the concurrent marking thread to finish |
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743 // what it is doing. In this case we will postpone the marking cycle |
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744 // initiation decision for the next pause. When we eventually decide |
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745 // to start a cycle, we will set _during_initial_mark_pause which |
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746 // will stay true until the end of the initial-mark pause and it's |
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747 // the condition that indicates that a pause is doing the |
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748 // initial-mark work. |
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749 volatile bool _during_initial_mark_pause; |
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750 |
| 342 | 751 bool _should_revert_to_full_young_gcs; |
| 752 bool _last_full_young_gc; | |
| 753 | |
| 754 // This set of variables tracks the collector efficiency, in order to | |
| 755 // determine whether we should initiate a new marking. | |
| 756 double _cur_mark_stop_world_time_ms; | |
| 757 double _mark_remark_start_sec; | |
| 758 double _mark_cleanup_start_sec; | |
| 759 double _mark_closure_time_ms; | |
| 760 | |
|
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761 // Update the young list target length either by setting it to the |
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762 // desired fixed value or by calculating it using G1's pause |
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763 // prediction model. If no rs_lengths parameter is passed, predict |
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764 // the RS lengths using the prediction model, otherwise use the |
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765 // given rs_lengths as the prediction. |
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766 void update_young_list_target_length(size_t rs_lengths = (size_t) -1); |
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767 |
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768 // Calculate and return the minimum desired young list target |
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769 // length. This is the minimum desired young list length according |
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770 // to the user's inputs. |
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771 size_t calculate_young_list_desired_min_length(size_t base_min_length); |
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|
772 |
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773 // Calculate and return the maximum desired young list target |
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774 // length. This is the maximum desired young list length according |
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775 // to the user's inputs. |
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776 size_t calculate_young_list_desired_max_length(); |
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|
777 |
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778 // Calculate and return the maximum young list target length that |
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779 // can fit into the pause time goal. The parameters are: rs_lengths |
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780 // represent the prediction of how large the young RSet lengths will |
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781 // be, base_min_length is the alreay existing number of regions in |
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782 // the young list, min_length and max_length are the desired min and |
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783 // max young list length according to the user's inputs. |
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784 size_t calculate_young_list_target_length(size_t rs_lengths, |
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785 size_t base_min_length, |
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786 size_t desired_min_length, |
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787 size_t desired_max_length); |
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788 |
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789 // Check whether a given young length (young_length) fits into the |
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790 // given target pause time and whether the prediction for the amount |
|
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791 // of objects to be copied for the given length will fit into the |
|
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792 // given free space (expressed by base_free_regions). It is used by |
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793 // calculate_young_list_target_length(). |
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794 bool predict_will_fit(size_t young_length, double base_time_ms, |
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795 size_t base_free_regions, double target_pause_time_ms); |
| 342 | 796 |
| 4013 | 797 // Count the number of bytes used in the CS. |
| 798 void count_CS_bytes_used(); | |
| 799 | |
| 800 void update_young_list_size_using_newratio(size_t number_of_heap_regions); | |
| 801 | |
| 342 | 802 public: |
| 803 | |
| 804 G1CollectorPolicy(); | |
| 805 | |
| 806 virtual G1CollectorPolicy* as_g1_policy() { return this; } | |
| 807 | |
| 808 virtual CollectorPolicy::Name kind() { | |
| 809 return CollectorPolicy::G1CollectorPolicyKind; | |
| 810 } | |
| 811 | |
|
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812 // Check the current value of the young list RSet lengths and |
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813 // compare it against the last prediction. If the current value is |
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814 // higher, recalculate the young list target length prediction. |
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815 void revise_young_list_target_length_if_necessary(); |
| 342 | 816 |
| 817 size_t bytes_in_collection_set() { | |
| 818 return _bytes_in_collection_set_before_gc; | |
| 819 } | |
| 820 | |
| 821 unsigned calc_gc_alloc_time_stamp() { | |
| 822 return _all_pause_times_ms->num() + 1; | |
| 823 } | |
| 824 | |
|
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825 // This should be called after the heap is resized. |
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826 void record_new_heap_size(size_t new_number_of_regions); |
|
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827 |
| 342 | 828 public: |
| 829 | |
| 4013 | 830 void init(); |
| 342 | 831 |
| 545 | 832 // Create jstat counters for the policy. |
| 833 virtual void initialize_gc_policy_counters(); | |
| 834 | |
| 342 | 835 virtual HeapWord* mem_allocate_work(size_t size, |
| 836 bool is_tlab, | |
| 837 bool* gc_overhead_limit_was_exceeded); | |
| 838 | |
| 839 // This method controls how a collector handles one or more | |
| 840 // of its generations being fully allocated. | |
| 841 virtual HeapWord* satisfy_failed_allocation(size_t size, | |
| 842 bool is_tlab); | |
| 843 | |
| 844 BarrierSet::Name barrier_set_name() { return BarrierSet::G1SATBCTLogging; } | |
| 845 | |
| 846 GenRemSet::Name rem_set_name() { return GenRemSet::CardTable; } | |
| 847 | |
| 848 // The number of collection pauses so far. | |
| 849 long n_pauses() const { return _n_pauses; } | |
| 850 | |
| 851 // Update the heuristic info to record a collection pause of the given | |
| 852 // start time, where the given number of bytes were used at the start. | |
| 853 // This may involve changing the desired size of a collection set. | |
| 854 | |
| 4013 | 855 void record_stop_world_start(); |
| 342 | 856 |
| 4013 | 857 void record_collection_pause_start(double start_time_sec, size_t start_used); |
| 342 | 858 |
| 859 // Must currently be called while the world is stopped. | |
|
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860 void record_concurrent_mark_init_end(double |
| 342 | 861 mark_init_elapsed_time_ms); |
| 862 | |
| 863 void record_mark_closure_time(double mark_closure_time_ms); | |
| 864 | |
| 4013 | 865 void record_concurrent_mark_remark_start(); |
| 866 void record_concurrent_mark_remark_end(); | |
| 342 | 867 |
| 4013 | 868 void record_concurrent_mark_cleanup_start(); |
| 869 void record_concurrent_mark_cleanup_end(); | |
| 870 void record_concurrent_mark_cleanup_completed(); | |
| 342 | 871 |
| 4013 | 872 void record_concurrent_pause(); |
| 873 void record_concurrent_pause_end(); | |
| 342 | 874 |
| 4013 | 875 void record_collection_pause_end(); |
|
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876 void print_heap_transition(); |
| 342 | 877 |
| 878 // Record the fact that a full collection occurred. | |
| 4013 | 879 void record_full_collection_start(); |
| 880 void record_full_collection_end(); | |
| 342 | 881 |
| 1611 | 882 void record_gc_worker_start_time(int worker_i, double ms) { |
| 883 _par_last_gc_worker_start_times_ms[worker_i] = ms; | |
| 884 } | |
| 885 | |
| 342 | 886 void record_ext_root_scan_time(int worker_i, double ms) { |
| 887 _par_last_ext_root_scan_times_ms[worker_i] = ms; | |
| 888 } | |
| 889 | |
| 890 void record_mark_stack_scan_time(int worker_i, double ms) { | |
| 891 _par_last_mark_stack_scan_times_ms[worker_i] = ms; | |
| 892 } | |
| 893 | |
| 894 void record_satb_drain_time(double ms) { | |
| 895 _cur_satb_drain_time_ms = ms; | |
| 896 _satb_drain_time_set = true; | |
| 897 } | |
| 898 | |
| 899 void record_satb_drain_processed_buffers (int processed_buffers) { | |
| 900 _last_satb_drain_processed_buffers = processed_buffers; | |
| 901 } | |
| 902 | |
| 903 void record_mod_union_time(double ms) { | |
| 904 _all_mod_union_times_ms->add(ms); | |
| 905 } | |
| 906 | |
| 907 void record_update_rs_time(int thread, double ms) { | |
| 908 _par_last_update_rs_times_ms[thread] = ms; | |
| 909 } | |
| 910 | |
| 911 void record_update_rs_processed_buffers (int thread, | |
| 912 double processed_buffers) { | |
| 913 _par_last_update_rs_processed_buffers[thread] = processed_buffers; | |
| 914 } | |
| 915 | |
| 916 void record_scan_rs_time(int thread, double ms) { | |
| 917 _par_last_scan_rs_times_ms[thread] = ms; | |
| 918 } | |
| 919 | |
| 920 void reset_obj_copy_time(int thread) { | |
| 921 _par_last_obj_copy_times_ms[thread] = 0.0; | |
| 922 } | |
| 923 | |
| 924 void reset_obj_copy_time() { | |
| 925 reset_obj_copy_time(0); | |
| 926 } | |
| 927 | |
| 928 void record_obj_copy_time(int thread, double ms) { | |
| 929 _par_last_obj_copy_times_ms[thread] += ms; | |
| 930 } | |
| 931 | |
| 1611 | 932 void record_termination(int thread, double ms, size_t attempts) { |
| 933 _par_last_termination_times_ms[thread] = ms; | |
| 934 _par_last_termination_attempts[thread] = (double) attempts; | |
| 342 | 935 } |
| 936 | |
| 1611 | 937 void record_gc_worker_end_time(int worker_i, double ms) { |
| 938 _par_last_gc_worker_end_times_ms[worker_i] = ms; | |
| 342 | 939 } |
| 940 | |
|
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941 void record_pause_time_ms(double ms) { |
| 342 | 942 _last_pause_time_ms = ms; |
| 943 } | |
| 944 | |
| 945 void record_clear_ct_time(double ms) { | |
| 946 _cur_clear_ct_time_ms = ms; | |
| 947 } | |
| 948 | |
| 949 void record_par_time(double ms) { | |
| 950 _cur_collection_par_time_ms = ms; | |
| 951 } | |
| 952 | |
| 953 void record_aux_start_time(int i) { | |
| 954 guarantee(i < _aux_num, "should be within range"); | |
| 955 _cur_aux_start_times_ms[i] = os::elapsedTime() * 1000.0; | |
| 956 } | |
| 957 | |
| 958 void record_aux_end_time(int i) { | |
| 959 guarantee(i < _aux_num, "should be within range"); | |
| 960 double ms = os::elapsedTime() * 1000.0 - _cur_aux_start_times_ms[i]; | |
| 961 _cur_aux_times_set[i] = true; | |
| 962 _cur_aux_times_ms[i] += ms; | |
| 963 } | |
| 964 | |
|
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|
965 void record_ref_proc_time(double ms) { |
|
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|
966 _cur_ref_proc_time_ms = ms; |
|
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|
967 } |
|
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|
968 |
|
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|
969 void record_ref_enq_time(double ms) { |
|
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970 _cur_ref_enq_time_ms = ms; |
|
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|
971 } |
|
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|
972 |
|
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|
973 #ifndef PRODUCT |
|
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974 void record_cc_clear_time(double ms) { |
|
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975 if (_min_clear_cc_time_ms < 0.0 || ms <= _min_clear_cc_time_ms) |
|
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976 _min_clear_cc_time_ms = ms; |
|
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977 if (_max_clear_cc_time_ms < 0.0 || ms >= _max_clear_cc_time_ms) |
|
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978 _max_clear_cc_time_ms = ms; |
|
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|
979 _cur_clear_cc_time_ms = ms; |
|
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980 _cum_clear_cc_time_ms += ms; |
|
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|
981 _num_cc_clears++; |
|
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|
982 } |
|
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|
983 #endif |
|
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|
984 |
|
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985 // Record how much space we copied during a GC. This is typically |
|
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986 // called when a GC alloc region is being retired. |
|
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|
987 void record_bytes_copied_during_gc(size_t bytes) { |
|
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988 _bytes_copied_during_gc += bytes; |
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989 } |
|
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990 |
|
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|
991 // The amount of space we copied during a GC. |
|
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992 size_t bytes_copied_during_gc() { |
|
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993 return _bytes_copied_during_gc; |
|
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|
994 } |
| 342 | 995 |
| 996 // Choose a new collection set. Marks the chosen regions as being | |
| 997 // "in_collection_set", and links them together. The head and number of | |
| 998 // the collection set are available via access methods. | |
| 4013 | 999 void choose_collection_set(double target_pause_time_ms); |
| 342 | 1000 |
| 1001 // The head of the list (via "next_in_collection_set()") representing the | |
| 1002 // current collection set. | |
| 1003 HeapRegion* collection_set() { return _collection_set; } | |
| 1004 | |
|
1394
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1005 void clear_collection_set() { _collection_set = NULL; } |
|
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1006 |
| 342 | 1007 // The number of elements in the current collection set. |
| 1008 size_t collection_set_size() { return _collection_set_size; } | |
| 1009 | |
| 1010 // Add "hr" to the CS. | |
| 1011 void add_to_collection_set(HeapRegion* hr); | |
| 1012 | |
|
1394
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1013 // Incremental CSet Support |
|
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1014 |
|
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1015 // The head of the incrementally built collection set. |
|
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1016 HeapRegion* inc_cset_head() { return _inc_cset_head; } |
|
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1017 |
|
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1018 // The tail of the incrementally built collection set. |
|
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1019 HeapRegion* inc_set_tail() { return _inc_cset_tail; } |
|
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1020 |
|
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1021 // The number of elements in the incrementally built collection set. |
|
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1022 size_t inc_cset_size() { return _inc_cset_size; } |
|
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1023 |
|
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1024 // Initialize incremental collection set info. |
|
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1025 void start_incremental_cset_building(); |
|
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1026 |
|
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|
1027 void clear_incremental_cset() { |
|
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1028 _inc_cset_head = NULL; |
|
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1029 _inc_cset_tail = NULL; |
|
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|
1030 } |
|
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|
1031 |
|
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|
1032 // Stop adding regions to the incremental collection set |
|
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|
1033 void stop_incremental_cset_building() { _inc_cset_build_state = Inactive; } |
|
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1034 |
|
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|
1035 // Add/remove information about hr to the aggregated information |
|
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1036 // for the incrementally built collection set. |
|
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|
1037 void add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length); |
|
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|
1038 void remove_from_incremental_cset_info(HeapRegion* hr); |
|
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|
1039 |
|
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|
1040 // Update information about hr in the aggregated information for |
|
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1041 // the incrementally built collection set. |
|
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|
1042 void update_incremental_cset_info(HeapRegion* hr, size_t new_rs_length); |
|
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|
1043 |
|
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|
1044 private: |
|
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|
1045 // Update the incremental cset information when adding a region |
|
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1046 // (should not be called directly). |
|
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|
1047 void add_region_to_incremental_cset_common(HeapRegion* hr); |
|
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|
1048 |
|
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|
1049 public: |
|
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|
1050 // Add hr to the LHS of the incremental collection set. |
|
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|
1051 void add_region_to_incremental_cset_lhs(HeapRegion* hr); |
|
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|
1052 |
|
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|
1053 // Add hr to the RHS of the incremental collection set. |
|
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|
1054 void add_region_to_incremental_cset_rhs(HeapRegion* hr); |
|
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|
1055 |
|
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|
1056 #ifndef PRODUCT |
|
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1057 void print_collection_set(HeapRegion* list_head, outputStream* st); |
|
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|
1058 #endif // !PRODUCT |
|
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|
1059 |
|
1359
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|
1060 bool initiate_conc_mark_if_possible() { return _initiate_conc_mark_if_possible; } |
|
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1061 void set_initiate_conc_mark_if_possible() { _initiate_conc_mark_if_possible = true; } |
|
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|
1062 void clear_initiate_conc_mark_if_possible() { _initiate_conc_mark_if_possible = false; } |
|
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|
1063 |
|
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|
1064 bool during_initial_mark_pause() { return _during_initial_mark_pause; } |
|
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|
1065 void set_during_initial_mark_pause() { _during_initial_mark_pause = true; } |
|
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|
1066 void clear_during_initial_mark_pause(){ _during_initial_mark_pause = false; } |
|
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|
1067 |
|
1656
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|
1068 // This sets the initiate_conc_mark_if_possible() flag to start a |
|
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|
1069 // new cycle, as long as we are not already in one. It's best if it |
|
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|
1070 // is called during a safepoint when the test whether a cycle is in |
|
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|
1071 // progress or not is stable. |
|
3914
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|
1072 bool force_initial_mark_if_outside_cycle(GCCause::Cause gc_cause); |
|
1656
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|
1073 |
|
1359
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|
1074 // This is called at the very beginning of an evacuation pause (it |
|
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|
1075 // has to be the first thing that the pause does). If |
|
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|
1076 // initiate_conc_mark_if_possible() is true, and the concurrent |
|
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|
1077 // marking thread has completed its work during the previous cycle, |
|
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1078 // it will set during_initial_mark_pause() to so that the pause does |
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1079 // the initial-mark work and start a marking cycle. |
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1080 void decide_on_conc_mark_initiation(); |
| 342 | 1081 |
| 1082 // If an expansion would be appropriate, because recent GC overhead had | |
| 1083 // exceeded the desired limit, return an amount to expand by. | |
| 4013 | 1084 size_t expansion_amount(); |
| 342 | 1085 |
| 1086 #ifndef PRODUCT | |
| 1087 // Check any appropriate marked bytes info, asserting false if | |
| 1088 // something's wrong, else returning "true". | |
| 4013 | 1089 bool assertMarkedBytesDataOK(); |
| 342 | 1090 #endif |
| 1091 | |
| 1092 // Print tracing information. | |
| 1093 void print_tracing_info() const; | |
| 1094 | |
| 1095 // Print stats on young survival ratio | |
| 1096 void print_yg_surv_rate_info() const; | |
| 1097 | |
| 545 | 1098 void finished_recalculating_age_indexes(bool is_survivors) { |
| 1099 if (is_survivors) { | |
| 1100 _survivor_surv_rate_group->finished_recalculating_age_indexes(); | |
| 1101 } else { | |
| 1102 _short_lived_surv_rate_group->finished_recalculating_age_indexes(); | |
| 1103 } | |
| 342 | 1104 // do that for any other surv rate groups |
| 1105 } | |
| 1106 | |
| 1973 | 1107 bool is_young_list_full() { |
| 1108 size_t young_list_length = _g1->young_list()->length(); | |
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1109 size_t young_list_target_length = _young_list_target_length; |
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1110 return young_list_length >= young_list_target_length; |
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1111 } |
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1112 |
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1113 bool can_expand_young_list() { |
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1114 size_t young_list_length = _g1->young_list()->length(); |
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1115 size_t young_list_max_length = _young_list_max_length; |
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1116 return young_list_length < young_list_max_length; |
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1117 } |
| 1973 | 1118 |
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1119 size_t young_list_max_length() { |
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1120 return _young_list_max_length; |
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1121 } |
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1122 |
| 1973 | 1123 void update_region_num(bool young); |
| 342 | 1124 |
| 1125 bool full_young_gcs() { | |
| 1126 return _full_young_gcs; | |
| 1127 } | |
| 1128 void set_full_young_gcs(bool full_young_gcs) { | |
| 1129 _full_young_gcs = full_young_gcs; | |
| 1130 } | |
| 1131 | |
| 1132 bool adaptive_young_list_length() { | |
| 1133 return _adaptive_young_list_length; | |
| 1134 } | |
| 1135 void set_adaptive_young_list_length(bool adaptive_young_list_length) { | |
| 1136 _adaptive_young_list_length = adaptive_young_list_length; | |
| 1137 } | |
| 1138 | |
| 1139 inline double get_gc_eff_factor() { | |
| 1140 double ratio = _known_garbage_ratio; | |
| 1141 | |
| 1142 double square = ratio * ratio; | |
| 1143 // square = square * square; | |
| 1144 double ret = square * 9.0 + 1.0; | |
| 1145 #if 0 | |
| 1146 gclog_or_tty->print_cr("ratio = %1.2lf, ret = %1.2lf", ratio, ret); | |
| 1147 #endif // 0 | |
| 1148 guarantee(0.0 <= ret && ret < 10.0, "invariant!"); | |
| 1149 return ret; | |
| 1150 } | |
| 1151 | |
| 4013 | 1152 private: |
| 342 | 1153 // |
| 1154 // Survivor regions policy. | |
| 1155 // | |
| 1156 | |
| 1157 // Current tenuring threshold, set to 0 if the collector reaches the | |
| 1158 // maximum amount of suvivors regions. | |
| 1159 int _tenuring_threshold; | |
| 1160 | |
| 545 | 1161 // The limit on the number of regions allocated for survivors. |
| 1162 size_t _max_survivor_regions; | |
| 1163 | |
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1164 // For reporting purposes. |
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1165 size_t _eden_bytes_before_gc; |
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1166 size_t _survivor_bytes_before_gc; |
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1167 size_t _capacity_before_gc; |
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1168 |
| 545 | 1169 // The amount of survor regions after a collection. |
| 1170 size_t _recorded_survivor_regions; | |
| 1171 // List of survivor regions. | |
| 1172 HeapRegion* _recorded_survivor_head; | |
| 1173 HeapRegion* _recorded_survivor_tail; | |
| 1174 | |
| 1175 ageTable _survivors_age_table; | |
| 1176 | |
| 342 | 1177 public: |
| 1178 | |
| 1179 inline GCAllocPurpose | |
| 1180 evacuation_destination(HeapRegion* src_region, int age, size_t word_sz) { | |
| 1181 if (age < _tenuring_threshold && src_region->is_young()) { | |
| 1182 return GCAllocForSurvived; | |
| 1183 } else { | |
| 1184 return GCAllocForTenured; | |
| 1185 } | |
| 1186 } | |
| 1187 | |
| 1188 inline bool track_object_age(GCAllocPurpose purpose) { | |
| 1189 return purpose == GCAllocForSurvived; | |
| 1190 } | |
| 1191 | |
| 545 | 1192 static const size_t REGIONS_UNLIMITED = ~(size_t)0; |
| 1193 | |
| 1194 size_t max_regions(int purpose); | |
| 342 | 1195 |
| 1196 // The limit on regions for a particular purpose is reached. | |
| 1197 void note_alloc_region_limit_reached(int purpose) { | |
| 1198 if (purpose == GCAllocForSurvived) { | |
| 1199 _tenuring_threshold = 0; | |
| 1200 } | |
| 1201 } | |
| 1202 | |
| 1203 void note_start_adding_survivor_regions() { | |
| 1204 _survivor_surv_rate_group->start_adding_regions(); | |
| 1205 } | |
| 1206 | |
| 1207 void note_stop_adding_survivor_regions() { | |
| 1208 _survivor_surv_rate_group->stop_adding_regions(); | |
| 1209 } | |
| 545 | 1210 |
| 1211 void record_survivor_regions(size_t regions, | |
| 1212 HeapRegion* head, | |
| 1213 HeapRegion* tail) { | |
| 1214 _recorded_survivor_regions = regions; | |
| 1215 _recorded_survivor_head = head; | |
| 1216 _recorded_survivor_tail = tail; | |
| 1217 } | |
| 1218 | |
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1219 size_t recorded_survivor_regions() { |
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1220 return _recorded_survivor_regions; |
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1221 } |
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1222 |
| 545 | 1223 void record_thread_age_table(ageTable* age_table) |
| 1224 { | |
| 1225 _survivors_age_table.merge_par(age_table); | |
| 1226 } | |
| 1227 | |
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1228 void update_max_gc_locker_expansion(); |
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1229 |
| 545 | 1230 // Calculates survivor space parameters. |
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1231 void update_survivors_policy(); |
| 545 | 1232 |
| 342 | 1233 }; |
| 1234 | |
| 1235 // This should move to some place more general... | |
| 1236 | |
| 1237 // If we have "n" measurements, and we've kept track of their "sum" and the | |
| 1238 // "sum_of_squares" of the measurements, this returns the variance of the | |
| 1239 // sequence. | |
| 1240 inline double variance(int n, double sum_of_squares, double sum) { | |
| 1241 double n_d = (double)n; | |
| 1242 double avg = sum/n_d; | |
| 1243 return (sum_of_squares - 2.0 * avg * sum + n_d * avg * avg) / n_d; | |
| 1244 } | |
| 1245 | |
| 1972 | 1246 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTORPOLICY_HPP |