Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.hpp @ 2430:5c0b591e1074
6948149: G1: Imbalance in termination times
Summary: Changed default value of WorkStealingYieldsBeforeSleep from 1000 to 5000. Added more information to G1 pause logging.
Reviewed-by: jwilhelm, tonyp, jmasa
author | brutisso |
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date | Wed, 23 Mar 2011 14:12:51 +0100 |
parents | 016a3628c885 |
children | 053d84a76d3d |
rev | line source |
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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 |
342 | 132 double _cur_CH_strong_roots_end_sec; |
133 double _cur_CH_strong_roots_dur_ms; | |
134 double _cur_G1_strong_roots_end_sec; | |
135 double _cur_G1_strong_roots_dur_ms; | |
136 | |
137 // Statistics for recent GC pauses. See below for how indexed. | |
138 TruncatedSeq* _recent_CH_strong_roots_times_ms; | |
139 TruncatedSeq* _recent_G1_strong_roots_times_ms; | |
140 TruncatedSeq* _recent_evac_times_ms; | |
141 // These exclude marking times. | |
142 TruncatedSeq* _recent_pause_times_ms; | |
143 TruncatedSeq* _recent_gc_times_ms; | |
144 | |
145 TruncatedSeq* _recent_CS_bytes_used_before; | |
146 TruncatedSeq* _recent_CS_bytes_surviving; | |
147 | |
148 TruncatedSeq* _recent_rs_sizes; | |
149 | |
150 TruncatedSeq* _concurrent_mark_init_times_ms; | |
151 TruncatedSeq* _concurrent_mark_remark_times_ms; | |
152 TruncatedSeq* _concurrent_mark_cleanup_times_ms; | |
153 | |
677 | 154 Summary* _summary; |
342 | 155 |
156 NumberSeq* _all_pause_times_ms; | |
157 NumberSeq* _all_full_gc_times_ms; | |
158 double _stop_world_start; | |
159 NumberSeq* _all_stop_world_times_ms; | |
160 NumberSeq* _all_yield_times_ms; | |
161 | |
162 size_t _region_num_young; | |
163 size_t _region_num_tenured; | |
164 size_t _prev_region_num_young; | |
165 size_t _prev_region_num_tenured; | |
166 | |
167 NumberSeq* _all_mod_union_times_ms; | |
168 | |
169 int _aux_num; | |
170 NumberSeq* _all_aux_times_ms; | |
171 double* _cur_aux_start_times_ms; | |
172 double* _cur_aux_times_ms; | |
173 bool* _cur_aux_times_set; | |
174 | |
1611 | 175 double* _par_last_gc_worker_start_times_ms; |
342 | 176 double* _par_last_ext_root_scan_times_ms; |
177 double* _par_last_mark_stack_scan_times_ms; | |
178 double* _par_last_update_rs_times_ms; | |
179 double* _par_last_update_rs_processed_buffers; | |
180 double* _par_last_scan_rs_times_ms; | |
181 double* _par_last_obj_copy_times_ms; | |
182 double* _par_last_termination_times_ms; | |
1611 | 183 double* _par_last_termination_attempts; |
184 double* _par_last_gc_worker_end_times_ms; | |
2430 | 185 double* _par_last_gc_worker_times_ms; |
342 | 186 |
187 // indicates that we are in young GC mode | |
188 bool _in_young_gc_mode; | |
189 | |
190 // indicates whether we are in full young or partially young GC mode | |
191 bool _full_young_gcs; | |
192 | |
193 // if true, then it tries to dynamically adjust the length of the | |
194 // young list | |
195 bool _adaptive_young_list_length; | |
196 size_t _young_list_min_length; | |
197 size_t _young_list_target_length; | |
198 size_t _young_list_fixed_length; | |
199 | |
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200 // The max number of regions we can extend the eden by while the GC |
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201 // locker is active. This should be >= _young_list_target_length; |
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202 size_t _young_list_max_length; |
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203 |
342 | 204 size_t _young_cset_length; |
205 bool _last_young_gc_full; | |
206 | |
207 unsigned _full_young_pause_num; | |
208 unsigned _partial_young_pause_num; | |
209 | |
210 bool _during_marking; | |
211 bool _in_marking_window; | |
212 bool _in_marking_window_im; | |
213 | |
214 SurvRateGroup* _short_lived_surv_rate_group; | |
215 SurvRateGroup* _survivor_surv_rate_group; | |
216 // add here any more surv rate groups | |
217 | |
1356 | 218 double _gc_overhead_perc; |
219 | |
342 | 220 bool during_marking() { |
221 return _during_marking; | |
222 } | |
223 | |
224 // <NEW PREDICTION> | |
225 | |
226 private: | |
227 enum PredictionConstants { | |
228 TruncatedSeqLength = 10 | |
229 }; | |
230 | |
231 TruncatedSeq* _alloc_rate_ms_seq; | |
232 double _prev_collection_pause_end_ms; | |
233 | |
234 TruncatedSeq* _pending_card_diff_seq; | |
235 TruncatedSeq* _rs_length_diff_seq; | |
236 TruncatedSeq* _cost_per_card_ms_seq; | |
237 TruncatedSeq* _fully_young_cards_per_entry_ratio_seq; | |
238 TruncatedSeq* _partially_young_cards_per_entry_ratio_seq; | |
239 TruncatedSeq* _cost_per_entry_ms_seq; | |
240 TruncatedSeq* _partially_young_cost_per_entry_ms_seq; | |
241 TruncatedSeq* _cost_per_byte_ms_seq; | |
242 TruncatedSeq* _constant_other_time_ms_seq; | |
243 TruncatedSeq* _young_other_cost_per_region_ms_seq; | |
244 TruncatedSeq* _non_young_other_cost_per_region_ms_seq; | |
245 | |
246 TruncatedSeq* _pending_cards_seq; | |
247 TruncatedSeq* _scanned_cards_seq; | |
248 TruncatedSeq* _rs_lengths_seq; | |
249 | |
250 TruncatedSeq* _cost_per_byte_ms_during_cm_seq; | |
251 | |
252 TruncatedSeq* _young_gc_eff_seq; | |
253 | |
254 TruncatedSeq* _max_conc_overhead_seq; | |
255 | |
256 size_t _recorded_young_regions; | |
257 size_t _recorded_non_young_regions; | |
258 size_t _recorded_region_num; | |
259 | |
260 size_t _free_regions_at_end_of_collection; | |
261 | |
262 size_t _recorded_rs_lengths; | |
263 size_t _max_rs_lengths; | |
264 | |
265 size_t _recorded_marked_bytes; | |
266 size_t _recorded_young_bytes; | |
267 | |
268 size_t _predicted_pending_cards; | |
269 size_t _predicted_cards_scanned; | |
270 size_t _predicted_rs_lengths; | |
271 size_t _predicted_bytes_to_copy; | |
272 | |
273 double _predicted_survival_ratio; | |
274 double _predicted_rs_update_time_ms; | |
275 double _predicted_rs_scan_time_ms; | |
276 double _predicted_object_copy_time_ms; | |
277 double _predicted_constant_other_time_ms; | |
278 double _predicted_young_other_time_ms; | |
279 double _predicted_non_young_other_time_ms; | |
280 double _predicted_pause_time_ms; | |
281 | |
282 double _vtime_diff_ms; | |
283 | |
284 double _recorded_young_free_cset_time_ms; | |
285 double _recorded_non_young_free_cset_time_ms; | |
286 | |
287 double _sigma; | |
288 double _expensive_region_limit_ms; | |
289 | |
290 size_t _rs_lengths_prediction; | |
291 | |
292 size_t _known_garbage_bytes; | |
293 double _known_garbage_ratio; | |
294 | |
295 double sigma() { | |
296 return _sigma; | |
297 } | |
298 | |
299 // A function that prevents us putting too much stock in small sample | |
300 // sets. Returns a number between 2.0 and 1.0, depending on the number | |
301 // of samples. 5 or more samples yields one; fewer scales linearly from | |
302 // 2.0 at 1 sample to 1.0 at 5. | |
303 double confidence_factor(int samples) { | |
304 if (samples > 4) return 1.0; | |
305 else return 1.0 + sigma() * ((double)(5 - samples))/2.0; | |
306 } | |
307 | |
308 double get_new_neg_prediction(TruncatedSeq* seq) { | |
309 return seq->davg() - sigma() * seq->dsd(); | |
310 } | |
311 | |
312 #ifndef PRODUCT | |
313 bool verify_young_ages(HeapRegion* head, SurvRateGroup *surv_rate_group); | |
314 #endif // PRODUCT | |
315 | |
1111 | 316 void adjust_concurrent_refinement(double update_rs_time, |
317 double update_rs_processed_buffers, | |
318 double goal_ms); | |
319 | |
342 | 320 protected: |
321 double _pause_time_target_ms; | |
322 double _recorded_young_cset_choice_time_ms; | |
323 double _recorded_non_young_cset_choice_time_ms; | |
324 bool _within_target; | |
325 size_t _pending_cards; | |
326 size_t _max_pending_cards; | |
327 | |
328 public: | |
329 | |
330 void set_region_short_lived(HeapRegion* hr) { | |
331 hr->install_surv_rate_group(_short_lived_surv_rate_group); | |
332 } | |
333 | |
334 void set_region_survivors(HeapRegion* hr) { | |
335 hr->install_surv_rate_group(_survivor_surv_rate_group); | |
336 } | |
337 | |
338 #ifndef PRODUCT | |
339 bool verify_young_ages(); | |
340 #endif // PRODUCT | |
341 | |
342 double get_new_prediction(TruncatedSeq* seq) { | |
343 return MAX2(seq->davg() + sigma() * seq->dsd(), | |
344 seq->davg() * confidence_factor(seq->num())); | |
345 } | |
346 | |
347 size_t young_cset_length() { | |
348 return _young_cset_length; | |
349 } | |
350 | |
351 void record_max_rs_lengths(size_t rs_lengths) { | |
352 _max_rs_lengths = rs_lengths; | |
353 } | |
354 | |
355 size_t predict_pending_card_diff() { | |
356 double prediction = get_new_neg_prediction(_pending_card_diff_seq); | |
357 if (prediction < 0.00001) | |
358 return 0; | |
359 else | |
360 return (size_t) prediction; | |
361 } | |
362 | |
363 size_t predict_pending_cards() { | |
364 size_t max_pending_card_num = _g1->max_pending_card_num(); | |
365 size_t diff = predict_pending_card_diff(); | |
366 size_t prediction; | |
367 if (diff > max_pending_card_num) | |
368 prediction = max_pending_card_num; | |
369 else | |
370 prediction = max_pending_card_num - diff; | |
371 | |
372 return prediction; | |
373 } | |
374 | |
375 size_t predict_rs_length_diff() { | |
376 return (size_t) get_new_prediction(_rs_length_diff_seq); | |
377 } | |
378 | |
379 double predict_alloc_rate_ms() { | |
380 return get_new_prediction(_alloc_rate_ms_seq); | |
381 } | |
382 | |
383 double predict_cost_per_card_ms() { | |
384 return get_new_prediction(_cost_per_card_ms_seq); | |
385 } | |
386 | |
387 double predict_rs_update_time_ms(size_t pending_cards) { | |
388 return (double) pending_cards * predict_cost_per_card_ms(); | |
389 } | |
390 | |
391 double predict_fully_young_cards_per_entry_ratio() { | |
392 return get_new_prediction(_fully_young_cards_per_entry_ratio_seq); | |
393 } | |
394 | |
395 double predict_partially_young_cards_per_entry_ratio() { | |
396 if (_partially_young_cards_per_entry_ratio_seq->num() < 2) | |
397 return predict_fully_young_cards_per_entry_ratio(); | |
398 else | |
399 return get_new_prediction(_partially_young_cards_per_entry_ratio_seq); | |
400 } | |
401 | |
402 size_t predict_young_card_num(size_t rs_length) { | |
403 return (size_t) ((double) rs_length * | |
404 predict_fully_young_cards_per_entry_ratio()); | |
405 } | |
406 | |
407 size_t predict_non_young_card_num(size_t rs_length) { | |
408 return (size_t) ((double) rs_length * | |
409 predict_partially_young_cards_per_entry_ratio()); | |
410 } | |
411 | |
412 double predict_rs_scan_time_ms(size_t card_num) { | |
413 if (full_young_gcs()) | |
414 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); | |
415 else | |
416 return predict_partially_young_rs_scan_time_ms(card_num); | |
417 } | |
418 | |
419 double predict_partially_young_rs_scan_time_ms(size_t card_num) { | |
420 if (_partially_young_cost_per_entry_ms_seq->num() < 3) | |
421 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); | |
422 else | |
423 return (double) card_num * | |
424 get_new_prediction(_partially_young_cost_per_entry_ms_seq); | |
425 } | |
426 | |
427 double predict_object_copy_time_ms_during_cm(size_t bytes_to_copy) { | |
428 if (_cost_per_byte_ms_during_cm_seq->num() < 3) | |
429 return 1.1 * (double) bytes_to_copy * | |
430 get_new_prediction(_cost_per_byte_ms_seq); | |
431 else | |
432 return (double) bytes_to_copy * | |
433 get_new_prediction(_cost_per_byte_ms_during_cm_seq); | |
434 } | |
435 | |
436 double predict_object_copy_time_ms(size_t bytes_to_copy) { | |
437 if (_in_marking_window && !_in_marking_window_im) | |
438 return predict_object_copy_time_ms_during_cm(bytes_to_copy); | |
439 else | |
440 return (double) bytes_to_copy * | |
441 get_new_prediction(_cost_per_byte_ms_seq); | |
442 } | |
443 | |
444 double predict_constant_other_time_ms() { | |
445 return get_new_prediction(_constant_other_time_ms_seq); | |
446 } | |
447 | |
448 double predict_young_other_time_ms(size_t young_num) { | |
449 return | |
450 (double) young_num * | |
451 get_new_prediction(_young_other_cost_per_region_ms_seq); | |
452 } | |
453 | |
454 double predict_non_young_other_time_ms(size_t non_young_num) { | |
455 return | |
456 (double) non_young_num * | |
457 get_new_prediction(_non_young_other_cost_per_region_ms_seq); | |
458 } | |
459 | |
460 void check_if_region_is_too_expensive(double predicted_time_ms); | |
461 | |
462 double predict_young_collection_elapsed_time_ms(size_t adjustment); | |
463 double predict_base_elapsed_time_ms(size_t pending_cards); | |
464 double predict_base_elapsed_time_ms(size_t pending_cards, | |
465 size_t scanned_cards); | |
466 size_t predict_bytes_to_copy(HeapRegion* hr); | |
467 double predict_region_elapsed_time_ms(HeapRegion* hr, bool young); | |
468 | |
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469 // for use by: calculate_young_list_target_length(rs_length) |
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470 bool predict_will_fit(size_t young_region_num, |
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471 double base_time_ms, |
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472 size_t init_free_regions, |
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473 double target_pause_time_ms); |
342 | 474 |
475 void start_recording_regions(); | |
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476 void record_cset_region_info(HeapRegion* hr, bool young); |
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477 void record_non_young_cset_region(HeapRegion* hr); |
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478 |
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479 void set_recorded_young_regions(size_t n_regions); |
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480 void set_recorded_young_bytes(size_t bytes); |
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481 void set_recorded_rs_lengths(size_t rs_lengths); |
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482 void set_predicted_bytes_to_copy(size_t bytes); |
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483 |
342 | 484 void end_recording_regions(); |
485 | |
486 void record_vtime_diff_ms(double vtime_diff_ms) { | |
487 _vtime_diff_ms = vtime_diff_ms; | |
488 } | |
489 | |
490 void record_young_free_cset_time_ms(double time_ms) { | |
491 _recorded_young_free_cset_time_ms = time_ms; | |
492 } | |
493 | |
494 void record_non_young_free_cset_time_ms(double time_ms) { | |
495 _recorded_non_young_free_cset_time_ms = time_ms; | |
496 } | |
497 | |
498 double predict_young_gc_eff() { | |
499 return get_new_neg_prediction(_young_gc_eff_seq); | |
500 } | |
501 | |
545 | 502 double predict_survivor_regions_evac_time(); |
503 | |
342 | 504 // </NEW PREDICTION> |
505 | |
506 public: | |
507 void cset_regions_freed() { | |
508 bool propagate = _last_young_gc_full && !_in_marking_window; | |
509 _short_lived_surv_rate_group->all_surviving_words_recorded(propagate); | |
510 _survivor_surv_rate_group->all_surviving_words_recorded(propagate); | |
511 // also call it on any more surv rate groups | |
512 } | |
513 | |
514 void set_known_garbage_bytes(size_t known_garbage_bytes) { | |
515 _known_garbage_bytes = known_garbage_bytes; | |
516 size_t heap_bytes = _g1->capacity(); | |
517 _known_garbage_ratio = (double) _known_garbage_bytes / (double) heap_bytes; | |
518 } | |
519 | |
520 void decrease_known_garbage_bytes(size_t known_garbage_bytes) { | |
521 guarantee( _known_garbage_bytes >= known_garbage_bytes, "invariant" ); | |
522 | |
523 _known_garbage_bytes -= known_garbage_bytes; | |
524 size_t heap_bytes = _g1->capacity(); | |
525 _known_garbage_ratio = (double) _known_garbage_bytes / (double) heap_bytes; | |
526 } | |
527 | |
528 G1MMUTracker* mmu_tracker() { | |
529 return _mmu_tracker; | |
530 } | |
531 | |
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532 double max_pause_time_ms() { |
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533 return _mmu_tracker->max_gc_time() * 1000.0; |
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534 } |
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535 |
342 | 536 double predict_init_time_ms() { |
537 return get_new_prediction(_concurrent_mark_init_times_ms); | |
538 } | |
539 | |
540 double predict_remark_time_ms() { | |
541 return get_new_prediction(_concurrent_mark_remark_times_ms); | |
542 } | |
543 | |
544 double predict_cleanup_time_ms() { | |
545 return get_new_prediction(_concurrent_mark_cleanup_times_ms); | |
546 } | |
547 | |
548 // Returns an estimate of the survival rate of the region at yg-age | |
549 // "yg_age". | |
545 | 550 double predict_yg_surv_rate(int age, SurvRateGroup* surv_rate_group) { |
551 TruncatedSeq* seq = surv_rate_group->get_seq(age); | |
342 | 552 if (seq->num() == 0) |
553 gclog_or_tty->print("BARF! age is %d", age); | |
554 guarantee( seq->num() > 0, "invariant" ); | |
555 double pred = get_new_prediction(seq); | |
556 if (pred > 1.0) | |
557 pred = 1.0; | |
558 return pred; | |
559 } | |
560 | |
545 | 561 double predict_yg_surv_rate(int age) { |
562 return predict_yg_surv_rate(age, _short_lived_surv_rate_group); | |
563 } | |
564 | |
342 | 565 double accum_yg_surv_rate_pred(int age) { |
566 return _short_lived_surv_rate_group->accum_surv_rate_pred(age); | |
567 } | |
568 | |
569 protected: | |
1611 | 570 void print_stats(int level, const char* str, double value); |
571 void print_stats(int level, const char* str, int value); | |
572 | |
2430 | 573 void print_par_stats(int level, const char* str, double* data); |
574 void print_par_sizes(int level, const char* str, double* data); | |
342 | 575 |
576 void check_other_times(int level, | |
577 NumberSeq* other_times_ms, | |
578 NumberSeq* calc_other_times_ms) const; | |
579 | |
580 void print_summary (PauseSummary* stats) const; | |
581 | |
582 void print_summary (int level, const char* str, NumberSeq* seq) const; | |
583 void print_summary_sd (int level, const char* str, NumberSeq* seq) const; | |
584 | |
585 double avg_value (double* data); | |
586 double max_value (double* data); | |
587 double sum_of_values (double* data); | |
588 double max_sum (double* data1, double* data2); | |
589 | |
590 int _last_satb_drain_processed_buffers; | |
591 int _last_update_rs_processed_buffers; | |
592 double _last_pause_time_ms; | |
593 | |
594 size_t _bytes_in_to_space_before_gc; | |
595 size_t _bytes_in_to_space_after_gc; | |
596 size_t bytes_in_to_space_during_gc() { | |
597 return | |
598 _bytes_in_to_space_after_gc - _bytes_in_to_space_before_gc; | |
599 } | |
600 size_t _bytes_in_collection_set_before_gc; | |
601 // Used to count used bytes in CS. | |
602 friend class CountCSClosure; | |
603 | |
604 // Statistics kept per GC stoppage, pause or full. | |
605 TruncatedSeq* _recent_prev_end_times_for_all_gcs_sec; | |
606 | |
607 // We track markings. | |
608 int _num_markings; | |
609 double _mark_thread_startup_sec; // Time at startup of marking thread | |
610 | |
611 // Add a new GC of the given duration and end time to the record. | |
612 void update_recent_gc_times(double end_time_sec, double elapsed_ms); | |
613 | |
614 // The head of the list (via "next_in_collection_set()") representing the | |
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615 // current collection set. Set from the incrementally built collection |
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616 // set at the start of the pause. |
342 | 617 HeapRegion* _collection_set; |
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618 |
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619 // The number of regions in the collection set. Set from the incrementally |
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620 // built collection set at the start of an evacuation pause. |
342 | 621 size_t _collection_set_size; |
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622 |
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623 // The number of bytes in the collection set before the pause. Set from |
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624 // the incrementally built collection set at the start of an evacuation |
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625 // pause. |
342 | 626 size_t _collection_set_bytes_used_before; |
627 | |
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628 // The associated information that is maintained while the incremental |
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629 // collection set is being built with young regions. Used to populate |
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630 // the recorded info for the evacuation pause. |
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631 |
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632 enum CSetBuildType { |
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633 Active, // We are actively building the collection set |
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634 Inactive // We are not actively building the collection set |
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635 }; |
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636 |
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637 CSetBuildType _inc_cset_build_state; |
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638 |
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639 // The head of the incrementally built collection set. |
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640 HeapRegion* _inc_cset_head; |
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641 |
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642 // The tail of the incrementally built collection set. |
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643 HeapRegion* _inc_cset_tail; |
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644 |
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645 // The number of regions in the incrementally built collection set. |
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646 // Used to set _collection_set_size at the start of an evacuation |
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647 // pause. |
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648 size_t _inc_cset_size; |
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649 |
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650 // Used as the index in the surving young words structure |
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651 // which tracks the amount of space, for each young region, |
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652 // that survives the pause. |
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653 size_t _inc_cset_young_index; |
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654 |
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655 // The number of bytes in the incrementally built collection set. |
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656 // Used to set _collection_set_bytes_used_before at the start of |
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657 // an evacuation pause. |
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658 size_t _inc_cset_bytes_used_before; |
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659 |
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660 // Used to record the highest end of heap region in collection set |
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661 HeapWord* _inc_cset_max_finger; |
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662 |
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663 // The number of recorded used bytes in the young regions |
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664 // of the collection set. This is the sum of the used() bytes |
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665 // of retired young regions in the collection set. |
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666 size_t _inc_cset_recorded_young_bytes; |
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667 |
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668 // The RSet lengths recorded for regions in the collection set |
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669 // (updated by the periodic sampling of the regions in the |
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670 // young list/collection set). |
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671 size_t _inc_cset_recorded_rs_lengths; |
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672 |
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673 // The predicted elapsed time it will take to collect the regions |
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674 // in the collection set (updated by the periodic sampling of the |
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675 // regions in the young list/collection set). |
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676 double _inc_cset_predicted_elapsed_time_ms; |
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677 |
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678 // The predicted bytes to copy for the regions in the collection |
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679 // set (updated by the periodic sampling of the regions in the |
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680 // young list/collection set). |
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681 size_t _inc_cset_predicted_bytes_to_copy; |
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682 |
342 | 683 // Info about marking. |
684 int _n_marks; // Sticky at 2, so we know when we've done at least 2. | |
685 | |
686 // The number of collection pauses at the end of the last mark. | |
687 size_t _n_pauses_at_mark_end; | |
688 | |
689 // Stash a pointer to the g1 heap. | |
690 G1CollectedHeap* _g1; | |
691 | |
692 // The average time in ms per collection pause, averaged over recent pauses. | |
693 double recent_avg_time_for_pauses_ms(); | |
694 | |
695 // The average time in ms for processing CollectedHeap strong roots, per | |
696 // collection pause, averaged over recent pauses. | |
697 double recent_avg_time_for_CH_strong_ms(); | |
698 | |
699 // The average time in ms for processing the G1 remembered set, per | |
700 // pause, averaged over recent pauses. | |
701 double recent_avg_time_for_G1_strong_ms(); | |
702 | |
703 // The average time in ms for "evacuating followers", per pause, averaged | |
704 // over recent pauses. | |
705 double recent_avg_time_for_evac_ms(); | |
706 | |
707 // The number of "recent" GCs recorded in the number sequences | |
708 int number_of_recent_gcs(); | |
709 | |
710 // The average survival ratio, computed by the total number of bytes | |
711 // suriviving / total number of bytes before collection over the last | |
712 // several recent pauses. | |
713 double recent_avg_survival_fraction(); | |
714 // The survival fraction of the most recent pause; if there have been no | |
715 // pauses, returns 1.0. | |
716 double last_survival_fraction(); | |
717 | |
718 // Returns a "conservative" estimate of the recent survival rate, i.e., | |
719 // one that may be higher than "recent_avg_survival_fraction". | |
720 // This is conservative in several ways: | |
721 // If there have been few pauses, it will assume a potential high | |
722 // variance, and err on the side of caution. | |
723 // It puts a lower bound (currently 0.1) on the value it will return. | |
724 // To try to detect phase changes, if the most recent pause ("latest") has a | |
725 // higher-than average ("avg") survival rate, it returns that rate. | |
726 // "work" version is a utility function; young is restricted to young regions. | |
727 double conservative_avg_survival_fraction_work(double avg, | |
728 double latest); | |
729 | |
730 // The arguments are the two sequences that keep track of the number of bytes | |
731 // surviving and the total number of bytes before collection, resp., | |
732 // over the last evereal recent pauses | |
733 // Returns the survival rate for the category in the most recent pause. | |
734 // If there have been no pauses, returns 1.0. | |
735 double last_survival_fraction_work(TruncatedSeq* surviving, | |
736 TruncatedSeq* before); | |
737 | |
738 // The arguments are the two sequences that keep track of the number of bytes | |
739 // surviving and the total number of bytes before collection, resp., | |
740 // over the last several recent pauses | |
741 // Returns the average survival ration over the last several recent pauses | |
742 // If there have been no pauses, return 1.0 | |
743 double recent_avg_survival_fraction_work(TruncatedSeq* surviving, | |
744 TruncatedSeq* before); | |
745 | |
746 double conservative_avg_survival_fraction() { | |
747 double avg = recent_avg_survival_fraction(); | |
748 double latest = last_survival_fraction(); | |
749 return conservative_avg_survival_fraction_work(avg, latest); | |
750 } | |
751 | |
752 // The ratio of gc time to elapsed time, computed over recent pauses. | |
753 double _recent_avg_pause_time_ratio; | |
754 | |
755 double recent_avg_pause_time_ratio() { | |
756 return _recent_avg_pause_time_ratio; | |
757 } | |
758 | |
759 // Number of pauses between concurrent marking. | |
760 size_t _pauses_btwn_concurrent_mark; | |
761 | |
762 size_t _n_marks_since_last_pause; | |
763 | |
1359
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764 // At the end of a pause we check the heap occupancy and we decide |
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765 // whether we will start a marking cycle during the next pause. If |
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766 // we decide that we want to do that, we will set this parameter to |
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767 // true. So, this parameter will stay true between the end of a |
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768 // pause and the beginning of a subsequent pause (not necessarily |
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769 // the next one, see the comments on the next field) when we decide |
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770 // that we will indeed start a marking cycle and do the initial-mark |
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771 // work. |
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772 volatile bool _initiate_conc_mark_if_possible; |
342 | 773 |
1359
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774 // If initiate_conc_mark_if_possible() is set at the beginning of a |
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775 // pause, it is a suggestion that the pause should start a marking |
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776 // cycle by doing the initial-mark work. However, it is possible |
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777 // that the concurrent marking thread is still finishing up the |
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778 // previous marking cycle (e.g., clearing the next marking |
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779 // bitmap). If that is the case we cannot start a new cycle and |
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780 // we'll have to wait for the concurrent marking thread to finish |
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781 // what it is doing. In this case we will postpone the marking cycle |
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782 // initiation decision for the next pause. When we eventually decide |
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783 // to start a cycle, we will set _during_initial_mark_pause which |
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784 // will stay true until the end of the initial-mark pause and it's |
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785 // the condition that indicates that a pause is doing the |
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786 // initial-mark work. |
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787 volatile bool _during_initial_mark_pause; |
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788 |
342 | 789 bool _should_revert_to_full_young_gcs; |
790 bool _last_full_young_gc; | |
791 | |
792 // This set of variables tracks the collector efficiency, in order to | |
793 // determine whether we should initiate a new marking. | |
794 double _cur_mark_stop_world_time_ms; | |
795 double _mark_init_start_sec; | |
796 double _mark_remark_start_sec; | |
797 double _mark_cleanup_start_sec; | |
798 double _mark_closure_time_ms; | |
799 | |
800 void calculate_young_list_min_length(); | |
1394
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801 void calculate_young_list_target_length(); |
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802 void calculate_young_list_target_length(size_t rs_lengths); |
342 | 803 |
804 public: | |
805 | |
806 G1CollectorPolicy(); | |
807 | |
808 virtual G1CollectorPolicy* as_g1_policy() { return this; } | |
809 | |
810 virtual CollectorPolicy::Name kind() { | |
811 return CollectorPolicy::G1CollectorPolicyKind; | |
812 } | |
813 | |
814 void check_prediction_validity(); | |
815 | |
816 size_t bytes_in_collection_set() { | |
817 return _bytes_in_collection_set_before_gc; | |
818 } | |
819 | |
820 size_t bytes_in_to_space() { | |
821 return bytes_in_to_space_during_gc(); | |
822 } | |
823 | |
824 unsigned calc_gc_alloc_time_stamp() { | |
825 return _all_pause_times_ms->num() + 1; | |
826 } | |
827 | |
828 protected: | |
829 | |
830 // Count the number of bytes used in the CS. | |
831 void count_CS_bytes_used(); | |
832 | |
833 // Together these do the base cleanup-recording work. Subclasses might | |
834 // want to put something between them. | |
835 void record_concurrent_mark_cleanup_end_work1(size_t freed_bytes, | |
836 size_t max_live_bytes); | |
837 void record_concurrent_mark_cleanup_end_work2(); | |
838 | |
839 public: | |
840 | |
841 virtual void init(); | |
842 | |
545 | 843 // Create jstat counters for the policy. |
844 virtual void initialize_gc_policy_counters(); | |
845 | |
342 | 846 virtual HeapWord* mem_allocate_work(size_t size, |
847 bool is_tlab, | |
848 bool* gc_overhead_limit_was_exceeded); | |
849 | |
850 // This method controls how a collector handles one or more | |
851 // of its generations being fully allocated. | |
852 virtual HeapWord* satisfy_failed_allocation(size_t size, | |
853 bool is_tlab); | |
854 | |
855 BarrierSet::Name barrier_set_name() { return BarrierSet::G1SATBCTLogging; } | |
856 | |
857 GenRemSet::Name rem_set_name() { return GenRemSet::CardTable; } | |
858 | |
859 // The number of collection pauses so far. | |
860 long n_pauses() const { return _n_pauses; } | |
861 | |
862 // Update the heuristic info to record a collection pause of the given | |
863 // start time, where the given number of bytes were used at the start. | |
864 // This may involve changing the desired size of a collection set. | |
865 | |
866 virtual void record_stop_world_start(); | |
867 | |
868 virtual void record_collection_pause_start(double start_time_sec, | |
869 size_t start_used); | |
870 | |
871 // Must currently be called while the world is stopped. | |
872 virtual void record_concurrent_mark_init_start(); | |
873 virtual void record_concurrent_mark_init_end(); | |
874 void record_concurrent_mark_init_end_pre(double | |
875 mark_init_elapsed_time_ms); | |
876 | |
877 void record_mark_closure_time(double mark_closure_time_ms); | |
878 | |
879 virtual void record_concurrent_mark_remark_start(); | |
880 virtual void record_concurrent_mark_remark_end(); | |
881 | |
882 virtual void record_concurrent_mark_cleanup_start(); | |
883 virtual void record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
884 size_t max_live_bytes); | |
885 virtual void record_concurrent_mark_cleanup_completed(); | |
886 | |
887 virtual void record_concurrent_pause(); | |
888 virtual void record_concurrent_pause_end(); | |
889 | |
890 virtual void record_collection_pause_end_CH_strong_roots(); | |
891 virtual void record_collection_pause_end_G1_strong_roots(); | |
892 | |
1707 | 893 virtual void record_collection_pause_end(); |
342 | 894 |
895 // Record the fact that a full collection occurred. | |
896 virtual void record_full_collection_start(); | |
897 virtual void record_full_collection_end(); | |
898 | |
1611 | 899 void record_gc_worker_start_time(int worker_i, double ms) { |
900 _par_last_gc_worker_start_times_ms[worker_i] = ms; | |
901 } | |
902 | |
342 | 903 void record_ext_root_scan_time(int worker_i, double ms) { |
904 _par_last_ext_root_scan_times_ms[worker_i] = ms; | |
905 } | |
906 | |
907 void record_mark_stack_scan_time(int worker_i, double ms) { | |
908 _par_last_mark_stack_scan_times_ms[worker_i] = ms; | |
909 } | |
910 | |
911 void record_satb_drain_time(double ms) { | |
912 _cur_satb_drain_time_ms = ms; | |
913 _satb_drain_time_set = true; | |
914 } | |
915 | |
916 void record_satb_drain_processed_buffers (int processed_buffers) { | |
917 _last_satb_drain_processed_buffers = processed_buffers; | |
918 } | |
919 | |
920 void record_mod_union_time(double ms) { | |
921 _all_mod_union_times_ms->add(ms); | |
922 } | |
923 | |
924 void record_update_rs_time(int thread, double ms) { | |
925 _par_last_update_rs_times_ms[thread] = ms; | |
926 } | |
927 | |
928 void record_update_rs_processed_buffers (int thread, | |
929 double processed_buffers) { | |
930 _par_last_update_rs_processed_buffers[thread] = processed_buffers; | |
931 } | |
932 | |
933 void record_scan_rs_time(int thread, double ms) { | |
934 _par_last_scan_rs_times_ms[thread] = ms; | |
935 } | |
936 | |
937 void reset_obj_copy_time(int thread) { | |
938 _par_last_obj_copy_times_ms[thread] = 0.0; | |
939 } | |
940 | |
941 void reset_obj_copy_time() { | |
942 reset_obj_copy_time(0); | |
943 } | |
944 | |
945 void record_obj_copy_time(int thread, double ms) { | |
946 _par_last_obj_copy_times_ms[thread] += ms; | |
947 } | |
948 | |
1611 | 949 void record_termination(int thread, double ms, size_t attempts) { |
950 _par_last_termination_times_ms[thread] = ms; | |
951 _par_last_termination_attempts[thread] = (double) attempts; | |
342 | 952 } |
953 | |
1611 | 954 void record_gc_worker_end_time(int worker_i, double ms) { |
955 _par_last_gc_worker_end_times_ms[worker_i] = ms; | |
342 | 956 } |
957 | |
595
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958 void record_pause_time_ms(double ms) { |
342 | 959 _last_pause_time_ms = ms; |
960 } | |
961 | |
962 void record_clear_ct_time(double ms) { | |
963 _cur_clear_ct_time_ms = ms; | |
964 } | |
965 | |
966 void record_par_time(double ms) { | |
967 _cur_collection_par_time_ms = ms; | |
968 } | |
969 | |
970 void record_aux_start_time(int i) { | |
971 guarantee(i < _aux_num, "should be within range"); | |
972 _cur_aux_start_times_ms[i] = os::elapsedTime() * 1000.0; | |
973 } | |
974 | |
975 void record_aux_end_time(int i) { | |
976 guarantee(i < _aux_num, "should be within range"); | |
977 double ms = os::elapsedTime() * 1000.0 - _cur_aux_start_times_ms[i]; | |
978 _cur_aux_times_set[i] = true; | |
979 _cur_aux_times_ms[i] += ms; | |
980 } | |
981 | |
890
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982 #ifndef PRODUCT |
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983 void record_cc_clear_time(double ms) { |
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984 if (_min_clear_cc_time_ms < 0.0 || ms <= _min_clear_cc_time_ms) |
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985 _min_clear_cc_time_ms = ms; |
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986 if (_max_clear_cc_time_ms < 0.0 || ms >= _max_clear_cc_time_ms) |
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987 _max_clear_cc_time_ms = ms; |
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988 _cur_clear_cc_time_ms = ms; |
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989 _cum_clear_cc_time_ms += ms; |
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990 _num_cc_clears++; |
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991 } |
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992 #endif |
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993 |
342 | 994 // Record the fact that "bytes" bytes allocated in a region. |
995 void record_before_bytes(size_t bytes); | |
996 void record_after_bytes(size_t bytes); | |
997 | |
998 // Choose a new collection set. Marks the chosen regions as being | |
999 // "in_collection_set", and links them together. The head and number of | |
1000 // the collection set are available via access methods. | |
1707 | 1001 virtual void choose_collection_set(double target_pause_time_ms) = 0; |
342 | 1002 |
1003 // The head of the list (via "next_in_collection_set()") representing the | |
1004 // current collection set. | |
1005 HeapRegion* collection_set() { return _collection_set; } | |
1006 | |
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1007 void clear_collection_set() { _collection_set = NULL; } |
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1008 |
342 | 1009 // The number of elements in the current collection set. |
1010 size_t collection_set_size() { return _collection_set_size; } | |
1011 | |
1012 // Add "hr" to the CS. | |
1013 void add_to_collection_set(HeapRegion* hr); | |
1014 | |
1394
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1015 // Incremental CSet Support |
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1016 |
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1017 // The head of the incrementally built collection set. |
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1018 HeapRegion* inc_cset_head() { return _inc_cset_head; } |
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1019 |
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1020 // The tail of the incrementally built collection set. |
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1021 HeapRegion* inc_set_tail() { return _inc_cset_tail; } |
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1022 |
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1023 // The number of elements in the incrementally built collection set. |
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1024 size_t inc_cset_size() { return _inc_cset_size; } |
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1025 |
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1026 // Initialize incremental collection set info. |
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1027 void start_incremental_cset_building(); |
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1028 |
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1029 void clear_incremental_cset() { |
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1030 _inc_cset_head = NULL; |
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1031 _inc_cset_tail = NULL; |
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1032 } |
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1033 |
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1034 // Stop adding regions to the incremental collection set |
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1035 void stop_incremental_cset_building() { _inc_cset_build_state = Inactive; } |
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1036 |
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1037 // Add/remove information about hr to the aggregated information |
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1038 // for the incrementally built collection set. |
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1039 void add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length); |
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1040 void remove_from_incremental_cset_info(HeapRegion* hr); |
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1041 |
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1042 // Update information about hr in the aggregated information for |
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1043 // the incrementally built collection set. |
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1044 void update_incremental_cset_info(HeapRegion* hr, size_t new_rs_length); |
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1045 |
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1046 private: |
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1047 // Update the incremental cset information when adding a region |
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1048 // (should not be called directly). |
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1049 void add_region_to_incremental_cset_common(HeapRegion* hr); |
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1050 |
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1051 public: |
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1052 // Add hr to the LHS of the incremental collection set. |
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1053 void add_region_to_incremental_cset_lhs(HeapRegion* hr); |
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1054 |
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1055 // Add hr to the RHS of the incremental collection set. |
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1056 void add_region_to_incremental_cset_rhs(HeapRegion* hr); |
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1057 |
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1058 #ifndef PRODUCT |
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1059 void print_collection_set(HeapRegion* list_head, outputStream* st); |
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1060 #endif // !PRODUCT |
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1061 |
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1062 bool initiate_conc_mark_if_possible() { return _initiate_conc_mark_if_possible; } |
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1063 void set_initiate_conc_mark_if_possible() { _initiate_conc_mark_if_possible = true; } |
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1064 void clear_initiate_conc_mark_if_possible() { _initiate_conc_mark_if_possible = false; } |
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1065 |
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1066 bool during_initial_mark_pause() { return _during_initial_mark_pause; } |
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1067 void set_during_initial_mark_pause() { _during_initial_mark_pause = true; } |
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1068 void clear_during_initial_mark_pause(){ _during_initial_mark_pause = false; } |
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1069 |
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1070 // This sets the initiate_conc_mark_if_possible() flag to start a |
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1071 // new cycle, as long as we are not already in one. It's best if it |
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1072 // is called during a safepoint when the test whether a cycle is in |
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1073 // progress or not is stable. |
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1074 bool force_initial_mark_if_outside_cycle(); |
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1075 |
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1076 // This is called at the very beginning of an evacuation pause (it |
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1077 // has to be the first thing that the pause does). If |
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1078 // initiate_conc_mark_if_possible() is true, and the concurrent |
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1079 // marking thread has completed its work during the previous cycle, |
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1080 // it will set during_initial_mark_pause() to so that the pause does |
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1081 // the initial-mark work and start a marking cycle. |
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1082 void decide_on_conc_mark_initiation(); |
342 | 1083 |
1084 // If an expansion would be appropriate, because recent GC overhead had | |
1085 // exceeded the desired limit, return an amount to expand by. | |
1086 virtual size_t expansion_amount(); | |
1087 | |
1088 // note start of mark thread | |
1089 void note_start_of_mark_thread(); | |
1090 | |
1091 // The marked bytes of the "r" has changed; reclassify it's desirability | |
1092 // for marking. Also asserts that "r" is eligible for a CS. | |
1093 virtual void note_change_in_marked_bytes(HeapRegion* r) = 0; | |
1094 | |
1095 #ifndef PRODUCT | |
1096 // Check any appropriate marked bytes info, asserting false if | |
1097 // something's wrong, else returning "true". | |
1098 virtual bool assertMarkedBytesDataOK() = 0; | |
1099 #endif | |
1100 | |
1101 // Print tracing information. | |
1102 void print_tracing_info() const; | |
1103 | |
1104 // Print stats on young survival ratio | |
1105 void print_yg_surv_rate_info() const; | |
1106 | |
545 | 1107 void finished_recalculating_age_indexes(bool is_survivors) { |
1108 if (is_survivors) { | |
1109 _survivor_surv_rate_group->finished_recalculating_age_indexes(); | |
1110 } else { | |
1111 _short_lived_surv_rate_group->finished_recalculating_age_indexes(); | |
1112 } | |
342 | 1113 // do that for any other surv rate groups |
1114 } | |
1115 | |
1973 | 1116 bool is_young_list_full() { |
1117 size_t young_list_length = _g1->young_list()->length(); | |
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1118 size_t young_list_target_length = _young_list_target_length; |
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1119 if (G1FixedEdenSize) { |
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1120 young_list_target_length -= _max_survivor_regions; |
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1121 } |
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1122 return young_list_length >= young_list_target_length; |
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1123 } |
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1124 |
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1125 bool can_expand_young_list() { |
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1126 size_t young_list_length = _g1->young_list()->length(); |
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1127 size_t young_list_max_length = _young_list_max_length; |
1973 | 1128 if (G1FixedEdenSize) { |
1129 young_list_max_length -= _max_survivor_regions; | |
1130 } | |
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1131 return young_list_length < young_list_max_length; |
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1132 } |
1973 | 1133 |
1134 void update_region_num(bool young); | |
342 | 1135 |
1136 bool in_young_gc_mode() { | |
1137 return _in_young_gc_mode; | |
1138 } | |
1139 void set_in_young_gc_mode(bool in_young_gc_mode) { | |
1140 _in_young_gc_mode = in_young_gc_mode; | |
1141 } | |
1142 | |
1143 bool full_young_gcs() { | |
1144 return _full_young_gcs; | |
1145 } | |
1146 void set_full_young_gcs(bool full_young_gcs) { | |
1147 _full_young_gcs = full_young_gcs; | |
1148 } | |
1149 | |
1150 bool adaptive_young_list_length() { | |
1151 return _adaptive_young_list_length; | |
1152 } | |
1153 void set_adaptive_young_list_length(bool adaptive_young_list_length) { | |
1154 _adaptive_young_list_length = adaptive_young_list_length; | |
1155 } | |
1156 | |
1157 inline double get_gc_eff_factor() { | |
1158 double ratio = _known_garbage_ratio; | |
1159 | |
1160 double square = ratio * ratio; | |
1161 // square = square * square; | |
1162 double ret = square * 9.0 + 1.0; | |
1163 #if 0 | |
1164 gclog_or_tty->print_cr("ratio = %1.2lf, ret = %1.2lf", ratio, ret); | |
1165 #endif // 0 | |
1166 guarantee(0.0 <= ret && ret < 10.0, "invariant!"); | |
1167 return ret; | |
1168 } | |
1169 | |
1170 // | |
1171 // Survivor regions policy. | |
1172 // | |
1173 protected: | |
1174 | |
1175 // Current tenuring threshold, set to 0 if the collector reaches the | |
1176 // maximum amount of suvivors regions. | |
1177 int _tenuring_threshold; | |
1178 | |
545 | 1179 // The limit on the number of regions allocated for survivors. |
1180 size_t _max_survivor_regions; | |
1181 | |
1182 // The amount of survor regions after a collection. | |
1183 size_t _recorded_survivor_regions; | |
1184 // List of survivor regions. | |
1185 HeapRegion* _recorded_survivor_head; | |
1186 HeapRegion* _recorded_survivor_tail; | |
1187 | |
1188 ageTable _survivors_age_table; | |
1189 | |
342 | 1190 public: |
1191 | |
1192 inline GCAllocPurpose | |
1193 evacuation_destination(HeapRegion* src_region, int age, size_t word_sz) { | |
1194 if (age < _tenuring_threshold && src_region->is_young()) { | |
1195 return GCAllocForSurvived; | |
1196 } else { | |
1197 return GCAllocForTenured; | |
1198 } | |
1199 } | |
1200 | |
1201 inline bool track_object_age(GCAllocPurpose purpose) { | |
1202 return purpose == GCAllocForSurvived; | |
1203 } | |
1204 | |
1205 inline GCAllocPurpose alternative_purpose(int purpose) { | |
1206 return GCAllocForTenured; | |
1207 } | |
1208 | |
545 | 1209 static const size_t REGIONS_UNLIMITED = ~(size_t)0; |
1210 | |
1211 size_t max_regions(int purpose); | |
342 | 1212 |
1213 // The limit on regions for a particular purpose is reached. | |
1214 void note_alloc_region_limit_reached(int purpose) { | |
1215 if (purpose == GCAllocForSurvived) { | |
1216 _tenuring_threshold = 0; | |
1217 } | |
1218 } | |
1219 | |
1220 void note_start_adding_survivor_regions() { | |
1221 _survivor_surv_rate_group->start_adding_regions(); | |
1222 } | |
1223 | |
1224 void note_stop_adding_survivor_regions() { | |
1225 _survivor_surv_rate_group->stop_adding_regions(); | |
1226 } | |
545 | 1227 |
1228 void record_survivor_regions(size_t regions, | |
1229 HeapRegion* head, | |
1230 HeapRegion* tail) { | |
1231 _recorded_survivor_regions = regions; | |
1232 _recorded_survivor_head = head; | |
1233 _recorded_survivor_tail = tail; | |
1234 } | |
1235 | |
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1236 size_t recorded_survivor_regions() { |
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1237 return _recorded_survivor_regions; |
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1238 } |
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1239 |
545 | 1240 void record_thread_age_table(ageTable* age_table) |
1241 { | |
1242 _survivors_age_table.merge_par(age_table); | |
1243 } | |
1244 | |
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1245 void calculate_max_gc_locker_expansion(); |
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1246 |
545 | 1247 // Calculates survivor space parameters. |
1248 void calculate_survivors_policy(); | |
1249 | |
342 | 1250 }; |
1251 | |
1252 // This encapsulates a particular strategy for a g1 Collector. | |
1253 // | |
1254 // Start a concurrent mark when our heap size is n bytes | |
1255 // greater then our heap size was at the last concurrent | |
1256 // mark. Where n is a function of the CMSTriggerRatio | |
1257 // and the MinHeapFreeRatio. | |
1258 // | |
1259 // Start a g1 collection pause when we have allocated the | |
1260 // average number of bytes currently being freed in | |
1261 // a collection, but only if it is at least one region | |
1262 // full | |
1263 // | |
1264 // Resize Heap based on desired | |
1265 // allocation space, where desired allocation space is | |
1266 // a function of survival rate and desired future to size. | |
1267 // | |
1268 // Choose collection set by first picking all older regions | |
1269 // which have a survival rate which beats our projected young | |
1270 // survival rate. Then fill out the number of needed regions | |
1271 // with young regions. | |
1272 | |
1273 class G1CollectorPolicy_BestRegionsFirst: public G1CollectorPolicy { | |
1274 CollectionSetChooser* _collectionSetChooser; | |
1275 // If the estimated is less then desirable, resize if possible. | |
1276 void expand_if_possible(size_t numRegions); | |
1277 | |
1707 | 1278 virtual void choose_collection_set(double target_pause_time_ms); |
342 | 1279 virtual void record_collection_pause_start(double start_time_sec, |
1280 size_t start_used); | |
1281 virtual void record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
1282 size_t max_live_bytes); | |
1283 virtual void record_full_collection_end(); | |
1284 | |
1285 public: | |
1286 G1CollectorPolicy_BestRegionsFirst() { | |
1287 _collectionSetChooser = new CollectionSetChooser(); | |
1288 } | |
1707 | 1289 void record_collection_pause_end(); |
342 | 1290 // This is not needed any more, after the CSet choosing code was |
1291 // changed to use the pause prediction work. But let's leave the | |
1292 // hook in just in case. | |
1293 void note_change_in_marked_bytes(HeapRegion* r) { } | |
1294 #ifndef PRODUCT | |
1295 bool assertMarkedBytesDataOK(); | |
1296 #endif | |
1297 }; | |
1298 | |
1299 // This should move to some place more general... | |
1300 | |
1301 // If we have "n" measurements, and we've kept track of their "sum" and the | |
1302 // "sum_of_squares" of the measurements, this returns the variance of the | |
1303 // sequence. | |
1304 inline double variance(int n, double sum_of_squares, double sum) { | |
1305 double n_d = (double)n; | |
1306 double avg = sum/n_d; | |
1307 return (sum_of_squares - 2.0 * avg * sum + n_d * avg * avg) / n_d; | |
1308 } | |
1309 | |
1310 // Local Variables: *** | |
1311 // c-indentation-style: gnu *** | |
1312 // End: *** | |
1972 | 1313 |
1314 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTORPOLICY_HPP |