Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.hpp @ 1023:11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
Summary: change more guarantees in concurrent marking into asserts.
Reviewed-by: apetrusenko, iveresov
author | tonyp |
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date | Wed, 07 Oct 2009 10:09:57 -0400 |
parents | 2c79770d1f6e |
children | 44f61c24ddab |
rev | line source |
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342 | 1 /* |
579 | 2 * Copyright 2001-2009 Sun Microsystems, Inc. All Rights Reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 // A G1CollectorPolicy makes policy decisions that determine the | |
26 // characteristics of the collector. Examples include: | |
27 // * choice of collection set. | |
28 // * when to collect. | |
29 | |
30 class HeapRegion; | |
31 class CollectionSetChooser; | |
32 | |
33 // Yes, this is a bit unpleasant... but it saves replicating the same thing | |
34 // over and over again and introducing subtle problems through small typos and | |
35 // cutting and pasting mistakes. The macros below introduces a number | |
36 // sequnce into the following two classes and the methods that access it. | |
37 | |
38 #define define_num_seq(name) \ | |
39 private: \ | |
40 NumberSeq _all_##name##_times_ms; \ | |
41 public: \ | |
42 void record_##name##_time_ms(double ms) { \ | |
43 _all_##name##_times_ms.add(ms); \ | |
44 } \ | |
45 NumberSeq* get_##name##_seq() { \ | |
46 return &_all_##name##_times_ms; \ | |
47 } | |
48 | |
49 class MainBodySummary; | |
50 | |
549
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51 class PauseSummary: public CHeapObj { |
342 | 52 define_num_seq(total) |
53 define_num_seq(other) | |
54 | |
55 public: | |
56 virtual MainBodySummary* main_body_summary() { return NULL; } | |
57 }; | |
58 | |
549
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59 class MainBodySummary: public CHeapObj { |
342 | 60 define_num_seq(satb_drain) // optional |
61 define_num_seq(parallel) // parallel only | |
62 define_num_seq(ext_root_scan) | |
63 define_num_seq(mark_stack_scan) | |
64 define_num_seq(scan_only) | |
65 define_num_seq(update_rs) | |
66 define_num_seq(scan_rs) | |
67 define_num_seq(scan_new_refs) // Only for temp use; added to | |
68 // in parallel case. | |
69 define_num_seq(obj_copy) | |
70 define_num_seq(termination) // parallel only | |
71 define_num_seq(parallel_other) // parallel only | |
72 define_num_seq(mark_closure) | |
73 define_num_seq(clear_ct) // parallel only | |
74 }; | |
75 | |
677 | 76 class Summary: public PauseSummary, |
77 public MainBodySummary { | |
342 | 78 public: |
79 virtual MainBodySummary* main_body_summary() { return this; } | |
80 }; | |
81 | |
677 | 82 class AbandonedSummary: public PauseSummary { |
342 | 83 }; |
84 | |
85 class G1CollectorPolicy: public CollectorPolicy { | |
86 protected: | |
87 // The number of pauses during the execution. | |
88 long _n_pauses; | |
89 | |
90 // either equal to the number of parallel threads, if ParallelGCThreads | |
91 // has been set, or 1 otherwise | |
92 int _parallel_gc_threads; | |
93 | |
94 enum SomePrivateConstants { | |
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95 NumPrevPausesForHeuristics = 10 |
342 | 96 }; |
97 | |
98 G1MMUTracker* _mmu_tracker; | |
99 | |
100 void initialize_flags(); | |
101 | |
102 void initialize_all() { | |
103 initialize_flags(); | |
104 initialize_size_info(); | |
105 initialize_perm_generation(PermGen::MarkSweepCompact); | |
106 } | |
107 | |
108 virtual size_t default_init_heap_size() { | |
109 // Pick some reasonable default. | |
110 return 8*M; | |
111 } | |
112 | |
113 double _cur_collection_start_sec; | |
114 size_t _cur_collection_pause_used_at_start_bytes; | |
115 size_t _cur_collection_pause_used_regions_at_start; | |
116 size_t _prev_collection_pause_used_at_end_bytes; | |
117 double _cur_collection_par_time_ms; | |
118 double _cur_satb_drain_time_ms; | |
119 double _cur_clear_ct_time_ms; | |
120 bool _satb_drain_time_set; | |
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 |
342 | 131 double _cur_CH_strong_roots_end_sec; |
132 double _cur_CH_strong_roots_dur_ms; | |
133 double _cur_G1_strong_roots_end_sec; | |
134 double _cur_G1_strong_roots_dur_ms; | |
135 | |
136 // Statistics for recent GC pauses. See below for how indexed. | |
137 TruncatedSeq* _recent_CH_strong_roots_times_ms; | |
138 TruncatedSeq* _recent_G1_strong_roots_times_ms; | |
139 TruncatedSeq* _recent_evac_times_ms; | |
140 // These exclude marking times. | |
141 TruncatedSeq* _recent_pause_times_ms; | |
142 TruncatedSeq* _recent_gc_times_ms; | |
143 | |
144 TruncatedSeq* _recent_CS_bytes_used_before; | |
145 TruncatedSeq* _recent_CS_bytes_surviving; | |
146 | |
147 TruncatedSeq* _recent_rs_sizes; | |
148 | |
149 TruncatedSeq* _concurrent_mark_init_times_ms; | |
150 TruncatedSeq* _concurrent_mark_remark_times_ms; | |
151 TruncatedSeq* _concurrent_mark_cleanup_times_ms; | |
152 | |
677 | 153 Summary* _summary; |
154 AbandonedSummary* _abandoned_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 | |
175 double* _par_last_ext_root_scan_times_ms; | |
176 double* _par_last_mark_stack_scan_times_ms; | |
177 double* _par_last_scan_only_times_ms; | |
178 double* _par_last_scan_only_regions_scanned; | |
179 double* _par_last_update_rs_start_times_ms; | |
180 double* _par_last_update_rs_times_ms; | |
181 double* _par_last_update_rs_processed_buffers; | |
182 double* _par_last_scan_rs_start_times_ms; | |
183 double* _par_last_scan_rs_times_ms; | |
184 double* _par_last_scan_new_refs_times_ms; | |
185 double* _par_last_obj_copy_times_ms; | |
186 double* _par_last_termination_times_ms; | |
187 | |
188 // indicates that we are in young GC mode | |
189 bool _in_young_gc_mode; | |
190 | |
191 // indicates whether we are in full young or partially young GC mode | |
192 bool _full_young_gcs; | |
193 | |
194 // if true, then it tries to dynamically adjust the length of the | |
195 // young list | |
196 bool _adaptive_young_list_length; | |
197 size_t _young_list_min_length; | |
198 size_t _young_list_target_length; | |
199 size_t _young_list_so_prefix_length; | |
200 size_t _young_list_fixed_length; | |
201 | |
202 size_t _young_cset_length; | |
203 bool _last_young_gc_full; | |
204 | |
205 double _target_pause_time_ms; | |
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 | |
218 bool during_marking() { | |
219 return _during_marking; | |
220 } | |
221 | |
222 // <NEW PREDICTION> | |
223 | |
224 private: | |
225 enum PredictionConstants { | |
226 TruncatedSeqLength = 10 | |
227 }; | |
228 | |
229 TruncatedSeq* _alloc_rate_ms_seq; | |
230 double _prev_collection_pause_end_ms; | |
231 | |
232 TruncatedSeq* _pending_card_diff_seq; | |
233 TruncatedSeq* _rs_length_diff_seq; | |
234 TruncatedSeq* _cost_per_card_ms_seq; | |
235 TruncatedSeq* _cost_per_scan_only_region_ms_seq; | |
236 TruncatedSeq* _fully_young_cards_per_entry_ratio_seq; | |
237 TruncatedSeq* _partially_young_cards_per_entry_ratio_seq; | |
238 TruncatedSeq* _cost_per_entry_ms_seq; | |
239 TruncatedSeq* _partially_young_cost_per_entry_ms_seq; | |
240 TruncatedSeq* _cost_per_byte_ms_seq; | |
241 TruncatedSeq* _constant_other_time_ms_seq; | |
242 TruncatedSeq* _young_other_cost_per_region_ms_seq; | |
243 TruncatedSeq* _non_young_other_cost_per_region_ms_seq; | |
244 | |
245 TruncatedSeq* _pending_cards_seq; | |
246 TruncatedSeq* _scanned_cards_seq; | |
247 TruncatedSeq* _rs_lengths_seq; | |
248 | |
249 TruncatedSeq* _cost_per_byte_ms_during_cm_seq; | |
250 TruncatedSeq* _cost_per_scan_only_region_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_scan_only_regions; | |
258 size_t _recorded_non_young_regions; | |
259 size_t _recorded_region_num; | |
260 | |
261 size_t _free_regions_at_end_of_collection; | |
262 size_t _scan_only_regions_at_end_of_collection; | |
263 | |
264 size_t _recorded_rs_lengths; | |
265 size_t _max_rs_lengths; | |
266 | |
267 size_t _recorded_marked_bytes; | |
268 size_t _recorded_young_bytes; | |
269 | |
270 size_t _predicted_pending_cards; | |
271 size_t _predicted_cards_scanned; | |
272 size_t _predicted_rs_lengths; | |
273 size_t _predicted_bytes_to_copy; | |
274 | |
275 double _predicted_survival_ratio; | |
276 double _predicted_rs_update_time_ms; | |
277 double _predicted_rs_scan_time_ms; | |
278 double _predicted_scan_only_scan_time_ms; | |
279 double _predicted_object_copy_time_ms; | |
280 double _predicted_constant_other_time_ms; | |
281 double _predicted_young_other_time_ms; | |
282 double _predicted_non_young_other_time_ms; | |
283 double _predicted_pause_time_ms; | |
284 | |
285 double _vtime_diff_ms; | |
286 | |
287 double _recorded_young_free_cset_time_ms; | |
288 double _recorded_non_young_free_cset_time_ms; | |
289 | |
290 double _sigma; | |
291 double _expensive_region_limit_ms; | |
292 | |
293 size_t _rs_lengths_prediction; | |
294 | |
295 size_t _known_garbage_bytes; | |
296 double _known_garbage_ratio; | |
297 | |
298 double sigma() { | |
299 return _sigma; | |
300 } | |
301 | |
302 // A function that prevents us putting too much stock in small sample | |
303 // sets. Returns a number between 2.0 and 1.0, depending on the number | |
304 // of samples. 5 or more samples yields one; fewer scales linearly from | |
305 // 2.0 at 1 sample to 1.0 at 5. | |
306 double confidence_factor(int samples) { | |
307 if (samples > 4) return 1.0; | |
308 else return 1.0 + sigma() * ((double)(5 - samples))/2.0; | |
309 } | |
310 | |
311 double get_new_neg_prediction(TruncatedSeq* seq) { | |
312 return seq->davg() - sigma() * seq->dsd(); | |
313 } | |
314 | |
315 #ifndef PRODUCT | |
316 bool verify_young_ages(HeapRegion* head, SurvRateGroup *surv_rate_group); | |
317 #endif // PRODUCT | |
318 | |
319 protected: | |
320 double _pause_time_target_ms; | |
321 double _recorded_young_cset_choice_time_ms; | |
322 double _recorded_non_young_cset_choice_time_ms; | |
323 bool _within_target; | |
324 size_t _pending_cards; | |
325 size_t _max_pending_cards; | |
326 | |
327 public: | |
328 | |
329 void set_region_short_lived(HeapRegion* hr) { | |
330 hr->install_surv_rate_group(_short_lived_surv_rate_group); | |
331 } | |
332 | |
333 void set_region_survivors(HeapRegion* hr) { | |
334 hr->install_surv_rate_group(_survivor_surv_rate_group); | |
335 } | |
336 | |
337 #ifndef PRODUCT | |
338 bool verify_young_ages(); | |
339 #endif // PRODUCT | |
340 | |
341 void tag_scan_only(size_t short_lived_scan_only_length); | |
342 | |
343 double get_new_prediction(TruncatedSeq* seq) { | |
344 return MAX2(seq->davg() + sigma() * seq->dsd(), | |
345 seq->davg() * confidence_factor(seq->num())); | |
346 } | |
347 | |
348 size_t young_cset_length() { | |
349 return _young_cset_length; | |
350 } | |
351 | |
352 void record_max_rs_lengths(size_t rs_lengths) { | |
353 _max_rs_lengths = rs_lengths; | |
354 } | |
355 | |
356 size_t predict_pending_card_diff() { | |
357 double prediction = get_new_neg_prediction(_pending_card_diff_seq); | |
358 if (prediction < 0.00001) | |
359 return 0; | |
360 else | |
361 return (size_t) prediction; | |
362 } | |
363 | |
364 size_t predict_pending_cards() { | |
365 size_t max_pending_card_num = _g1->max_pending_card_num(); | |
366 size_t diff = predict_pending_card_diff(); | |
367 size_t prediction; | |
368 if (diff > max_pending_card_num) | |
369 prediction = max_pending_card_num; | |
370 else | |
371 prediction = max_pending_card_num - diff; | |
372 | |
373 return prediction; | |
374 } | |
375 | |
376 size_t predict_rs_length_diff() { | |
377 return (size_t) get_new_prediction(_rs_length_diff_seq); | |
378 } | |
379 | |
380 double predict_alloc_rate_ms() { | |
381 return get_new_prediction(_alloc_rate_ms_seq); | |
382 } | |
383 | |
384 double predict_cost_per_card_ms() { | |
385 return get_new_prediction(_cost_per_card_ms_seq); | |
386 } | |
387 | |
388 double predict_rs_update_time_ms(size_t pending_cards) { | |
389 return (double) pending_cards * predict_cost_per_card_ms(); | |
390 } | |
391 | |
392 double predict_fully_young_cards_per_entry_ratio() { | |
393 return get_new_prediction(_fully_young_cards_per_entry_ratio_seq); | |
394 } | |
395 | |
396 double predict_partially_young_cards_per_entry_ratio() { | |
397 if (_partially_young_cards_per_entry_ratio_seq->num() < 2) | |
398 return predict_fully_young_cards_per_entry_ratio(); | |
399 else | |
400 return get_new_prediction(_partially_young_cards_per_entry_ratio_seq); | |
401 } | |
402 | |
403 size_t predict_young_card_num(size_t rs_length) { | |
404 return (size_t) ((double) rs_length * | |
405 predict_fully_young_cards_per_entry_ratio()); | |
406 } | |
407 | |
408 size_t predict_non_young_card_num(size_t rs_length) { | |
409 return (size_t) ((double) rs_length * | |
410 predict_partially_young_cards_per_entry_ratio()); | |
411 } | |
412 | |
413 double predict_rs_scan_time_ms(size_t card_num) { | |
414 if (full_young_gcs()) | |
415 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); | |
416 else | |
417 return predict_partially_young_rs_scan_time_ms(card_num); | |
418 } | |
419 | |
420 double predict_partially_young_rs_scan_time_ms(size_t card_num) { | |
421 if (_partially_young_cost_per_entry_ms_seq->num() < 3) | |
422 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); | |
423 else | |
424 return (double) card_num * | |
425 get_new_prediction(_partially_young_cost_per_entry_ms_seq); | |
426 } | |
427 | |
428 double predict_scan_only_time_ms_during_cm(size_t scan_only_region_num) { | |
429 if (_cost_per_scan_only_region_ms_during_cm_seq->num() < 3) | |
430 return 1.5 * (double) scan_only_region_num * | |
431 get_new_prediction(_cost_per_scan_only_region_ms_seq); | |
432 else | |
433 return (double) scan_only_region_num * | |
434 get_new_prediction(_cost_per_scan_only_region_ms_during_cm_seq); | |
435 } | |
436 | |
437 double predict_scan_only_time_ms(size_t scan_only_region_num) { | |
438 if (_in_marking_window_im) | |
439 return predict_scan_only_time_ms_during_cm(scan_only_region_num); | |
440 else | |
441 return (double) scan_only_region_num * | |
442 get_new_prediction(_cost_per_scan_only_region_ms_seq); | |
443 } | |
444 | |
445 double predict_object_copy_time_ms_during_cm(size_t bytes_to_copy) { | |
446 if (_cost_per_byte_ms_during_cm_seq->num() < 3) | |
447 return 1.1 * (double) bytes_to_copy * | |
448 get_new_prediction(_cost_per_byte_ms_seq); | |
449 else | |
450 return (double) bytes_to_copy * | |
451 get_new_prediction(_cost_per_byte_ms_during_cm_seq); | |
452 } | |
453 | |
454 double predict_object_copy_time_ms(size_t bytes_to_copy) { | |
455 if (_in_marking_window && !_in_marking_window_im) | |
456 return predict_object_copy_time_ms_during_cm(bytes_to_copy); | |
457 else | |
458 return (double) bytes_to_copy * | |
459 get_new_prediction(_cost_per_byte_ms_seq); | |
460 } | |
461 | |
462 double predict_constant_other_time_ms() { | |
463 return get_new_prediction(_constant_other_time_ms_seq); | |
464 } | |
465 | |
466 double predict_young_other_time_ms(size_t young_num) { | |
467 return | |
468 (double) young_num * | |
469 get_new_prediction(_young_other_cost_per_region_ms_seq); | |
470 } | |
471 | |
472 double predict_non_young_other_time_ms(size_t non_young_num) { | |
473 return | |
474 (double) non_young_num * | |
475 get_new_prediction(_non_young_other_cost_per_region_ms_seq); | |
476 } | |
477 | |
478 void check_if_region_is_too_expensive(double predicted_time_ms); | |
479 | |
480 double predict_young_collection_elapsed_time_ms(size_t adjustment); | |
481 double predict_base_elapsed_time_ms(size_t pending_cards); | |
482 double predict_base_elapsed_time_ms(size_t pending_cards, | |
483 size_t scanned_cards); | |
484 size_t predict_bytes_to_copy(HeapRegion* hr); | |
485 double predict_region_elapsed_time_ms(HeapRegion* hr, bool young); | |
486 | |
487 // for use by: calculate_optimal_so_length(length) | |
488 void predict_gc_eff(size_t young_region_num, | |
489 size_t so_length, | |
490 double base_time_ms, | |
491 double *gc_eff, | |
492 double *pause_time_ms); | |
493 | |
494 // for use by: calculate_young_list_target_config(rs_length) | |
495 bool predict_gc_eff(size_t young_region_num, | |
496 size_t so_length, | |
497 double base_time_with_so_ms, | |
498 size_t init_free_regions, | |
499 double target_pause_time_ms, | |
500 double* gc_eff); | |
501 | |
502 void start_recording_regions(); | |
503 void record_cset_region(HeapRegion* hr, bool young); | |
504 void record_scan_only_regions(size_t scan_only_length); | |
505 void end_recording_regions(); | |
506 | |
507 void record_vtime_diff_ms(double vtime_diff_ms) { | |
508 _vtime_diff_ms = vtime_diff_ms; | |
509 } | |
510 | |
511 void record_young_free_cset_time_ms(double time_ms) { | |
512 _recorded_young_free_cset_time_ms = time_ms; | |
513 } | |
514 | |
515 void record_non_young_free_cset_time_ms(double time_ms) { | |
516 _recorded_non_young_free_cset_time_ms = time_ms; | |
517 } | |
518 | |
519 double predict_young_gc_eff() { | |
520 return get_new_neg_prediction(_young_gc_eff_seq); | |
521 } | |
522 | |
545 | 523 double predict_survivor_regions_evac_time(); |
524 | |
342 | 525 // </NEW PREDICTION> |
526 | |
527 public: | |
528 void cset_regions_freed() { | |
529 bool propagate = _last_young_gc_full && !_in_marking_window; | |
530 _short_lived_surv_rate_group->all_surviving_words_recorded(propagate); | |
531 _survivor_surv_rate_group->all_surviving_words_recorded(propagate); | |
532 // also call it on any more surv rate groups | |
533 } | |
534 | |
535 void set_known_garbage_bytes(size_t known_garbage_bytes) { | |
536 _known_garbage_bytes = known_garbage_bytes; | |
537 size_t heap_bytes = _g1->capacity(); | |
538 _known_garbage_ratio = (double) _known_garbage_bytes / (double) heap_bytes; | |
539 } | |
540 | |
541 void decrease_known_garbage_bytes(size_t known_garbage_bytes) { | |
542 guarantee( _known_garbage_bytes >= known_garbage_bytes, "invariant" ); | |
543 | |
544 _known_garbage_bytes -= known_garbage_bytes; | |
545 size_t heap_bytes = _g1->capacity(); | |
546 _known_garbage_ratio = (double) _known_garbage_bytes / (double) heap_bytes; | |
547 } | |
548 | |
549 G1MMUTracker* mmu_tracker() { | |
550 return _mmu_tracker; | |
551 } | |
552 | |
553 double predict_init_time_ms() { | |
554 return get_new_prediction(_concurrent_mark_init_times_ms); | |
555 } | |
556 | |
557 double predict_remark_time_ms() { | |
558 return get_new_prediction(_concurrent_mark_remark_times_ms); | |
559 } | |
560 | |
561 double predict_cleanup_time_ms() { | |
562 return get_new_prediction(_concurrent_mark_cleanup_times_ms); | |
563 } | |
564 | |
565 // Returns an estimate of the survival rate of the region at yg-age | |
566 // "yg_age". | |
545 | 567 double predict_yg_surv_rate(int age, SurvRateGroup* surv_rate_group) { |
568 TruncatedSeq* seq = surv_rate_group->get_seq(age); | |
342 | 569 if (seq->num() == 0) |
570 gclog_or_tty->print("BARF! age is %d", age); | |
571 guarantee( seq->num() > 0, "invariant" ); | |
572 double pred = get_new_prediction(seq); | |
573 if (pred > 1.0) | |
574 pred = 1.0; | |
575 return pred; | |
576 } | |
577 | |
545 | 578 double predict_yg_surv_rate(int age) { |
579 return predict_yg_surv_rate(age, _short_lived_surv_rate_group); | |
580 } | |
581 | |
342 | 582 double accum_yg_surv_rate_pred(int age) { |
583 return _short_lived_surv_rate_group->accum_surv_rate_pred(age); | |
584 } | |
585 | |
586 protected: | |
587 void print_stats (int level, const char* str, double value); | |
588 void print_stats (int level, const char* str, int value); | |
589 void print_par_stats (int level, const char* str, double* data) { | |
590 print_par_stats(level, str, data, true); | |
591 } | |
592 void print_par_stats (int level, const char* str, double* data, bool summary); | |
593 void print_par_buffers (int level, const char* str, double* data, bool summary); | |
594 | |
595 void check_other_times(int level, | |
596 NumberSeq* other_times_ms, | |
597 NumberSeq* calc_other_times_ms) const; | |
598 | |
599 void print_summary (PauseSummary* stats) const; | |
677 | 600 void print_abandoned_summary(PauseSummary* summary) const; |
342 | 601 |
602 void print_summary (int level, const char* str, NumberSeq* seq) const; | |
603 void print_summary_sd (int level, const char* str, NumberSeq* seq) const; | |
604 | |
605 double avg_value (double* data); | |
606 double max_value (double* data); | |
607 double sum_of_values (double* data); | |
608 double max_sum (double* data1, double* data2); | |
609 | |
610 int _last_satb_drain_processed_buffers; | |
611 int _last_update_rs_processed_buffers; | |
612 double _last_pause_time_ms; | |
613 | |
614 size_t _bytes_in_to_space_before_gc; | |
615 size_t _bytes_in_to_space_after_gc; | |
616 size_t bytes_in_to_space_during_gc() { | |
617 return | |
618 _bytes_in_to_space_after_gc - _bytes_in_to_space_before_gc; | |
619 } | |
620 size_t _bytes_in_collection_set_before_gc; | |
621 // Used to count used bytes in CS. | |
622 friend class CountCSClosure; | |
623 | |
624 // Statistics kept per GC stoppage, pause or full. | |
625 TruncatedSeq* _recent_prev_end_times_for_all_gcs_sec; | |
626 | |
627 // We track markings. | |
628 int _num_markings; | |
629 double _mark_thread_startup_sec; // Time at startup of marking thread | |
630 | |
631 // Add a new GC of the given duration and end time to the record. | |
632 void update_recent_gc_times(double end_time_sec, double elapsed_ms); | |
633 | |
634 // The head of the list (via "next_in_collection_set()") representing the | |
635 // current collection set. | |
636 HeapRegion* _collection_set; | |
637 size_t _collection_set_size; | |
638 size_t _collection_set_bytes_used_before; | |
639 | |
640 // Info about marking. | |
641 int _n_marks; // Sticky at 2, so we know when we've done at least 2. | |
642 | |
643 // The number of collection pauses at the end of the last mark. | |
644 size_t _n_pauses_at_mark_end; | |
645 | |
646 // Stash a pointer to the g1 heap. | |
647 G1CollectedHeap* _g1; | |
648 | |
649 // The average time in ms per collection pause, averaged over recent pauses. | |
650 double recent_avg_time_for_pauses_ms(); | |
651 | |
652 // The average time in ms for processing CollectedHeap strong roots, per | |
653 // collection pause, averaged over recent pauses. | |
654 double recent_avg_time_for_CH_strong_ms(); | |
655 | |
656 // The average time in ms for processing the G1 remembered set, per | |
657 // pause, averaged over recent pauses. | |
658 double recent_avg_time_for_G1_strong_ms(); | |
659 | |
660 // The average time in ms for "evacuating followers", per pause, averaged | |
661 // over recent pauses. | |
662 double recent_avg_time_for_evac_ms(); | |
663 | |
664 // The number of "recent" GCs recorded in the number sequences | |
665 int number_of_recent_gcs(); | |
666 | |
667 // The average survival ratio, computed by the total number of bytes | |
668 // suriviving / total number of bytes before collection over the last | |
669 // several recent pauses. | |
670 double recent_avg_survival_fraction(); | |
671 // The survival fraction of the most recent pause; if there have been no | |
672 // pauses, returns 1.0. | |
673 double last_survival_fraction(); | |
674 | |
675 // Returns a "conservative" estimate of the recent survival rate, i.e., | |
676 // one that may be higher than "recent_avg_survival_fraction". | |
677 // This is conservative in several ways: | |
678 // If there have been few pauses, it will assume a potential high | |
679 // variance, and err on the side of caution. | |
680 // It puts a lower bound (currently 0.1) on the value it will return. | |
681 // To try to detect phase changes, if the most recent pause ("latest") has a | |
682 // higher-than average ("avg") survival rate, it returns that rate. | |
683 // "work" version is a utility function; young is restricted to young regions. | |
684 double conservative_avg_survival_fraction_work(double avg, | |
685 double latest); | |
686 | |
687 // The arguments are the two sequences that keep track of the number of bytes | |
688 // surviving and the total number of bytes before collection, resp., | |
689 // over the last evereal recent pauses | |
690 // Returns the survival rate for the category in the most recent pause. | |
691 // If there have been no pauses, returns 1.0. | |
692 double last_survival_fraction_work(TruncatedSeq* surviving, | |
693 TruncatedSeq* before); | |
694 | |
695 // The arguments are the two sequences that keep track of the number of bytes | |
696 // surviving and the total number of bytes before collection, resp., | |
697 // over the last several recent pauses | |
698 // Returns the average survival ration over the last several recent pauses | |
699 // If there have been no pauses, return 1.0 | |
700 double recent_avg_survival_fraction_work(TruncatedSeq* surviving, | |
701 TruncatedSeq* before); | |
702 | |
703 double conservative_avg_survival_fraction() { | |
704 double avg = recent_avg_survival_fraction(); | |
705 double latest = last_survival_fraction(); | |
706 return conservative_avg_survival_fraction_work(avg, latest); | |
707 } | |
708 | |
709 // The ratio of gc time to elapsed time, computed over recent pauses. | |
710 double _recent_avg_pause_time_ratio; | |
711 | |
712 double recent_avg_pause_time_ratio() { | |
713 return _recent_avg_pause_time_ratio; | |
714 } | |
715 | |
716 // Number of pauses between concurrent marking. | |
717 size_t _pauses_btwn_concurrent_mark; | |
718 | |
719 size_t _n_marks_since_last_pause; | |
720 | |
721 // True iff CM has been initiated. | |
722 bool _conc_mark_initiated; | |
723 | |
724 // True iff CM should be initiated | |
725 bool _should_initiate_conc_mark; | |
726 bool _should_revert_to_full_young_gcs; | |
727 bool _last_full_young_gc; | |
728 | |
729 // This set of variables tracks the collector efficiency, in order to | |
730 // determine whether we should initiate a new marking. | |
731 double _cur_mark_stop_world_time_ms; | |
732 double _mark_init_start_sec; | |
733 double _mark_remark_start_sec; | |
734 double _mark_cleanup_start_sec; | |
735 double _mark_closure_time_ms; | |
736 | |
737 void calculate_young_list_min_length(); | |
738 void calculate_young_list_target_config(); | |
739 void calculate_young_list_target_config(size_t rs_lengths); | |
740 size_t calculate_optimal_so_length(size_t young_list_length); | |
741 | |
742 public: | |
743 | |
744 G1CollectorPolicy(); | |
745 | |
746 virtual G1CollectorPolicy* as_g1_policy() { return this; } | |
747 | |
748 virtual CollectorPolicy::Name kind() { | |
749 return CollectorPolicy::G1CollectorPolicyKind; | |
750 } | |
751 | |
752 void check_prediction_validity(); | |
753 | |
754 size_t bytes_in_collection_set() { | |
755 return _bytes_in_collection_set_before_gc; | |
756 } | |
757 | |
758 size_t bytes_in_to_space() { | |
759 return bytes_in_to_space_during_gc(); | |
760 } | |
761 | |
762 unsigned calc_gc_alloc_time_stamp() { | |
763 return _all_pause_times_ms->num() + 1; | |
764 } | |
765 | |
766 protected: | |
767 | |
768 // Count the number of bytes used in the CS. | |
769 void count_CS_bytes_used(); | |
770 | |
771 // Together these do the base cleanup-recording work. Subclasses might | |
772 // want to put something between them. | |
773 void record_concurrent_mark_cleanup_end_work1(size_t freed_bytes, | |
774 size_t max_live_bytes); | |
775 void record_concurrent_mark_cleanup_end_work2(); | |
776 | |
777 public: | |
778 | |
779 virtual void init(); | |
780 | |
545 | 781 // Create jstat counters for the policy. |
782 virtual void initialize_gc_policy_counters(); | |
783 | |
342 | 784 virtual HeapWord* mem_allocate_work(size_t size, |
785 bool is_tlab, | |
786 bool* gc_overhead_limit_was_exceeded); | |
787 | |
788 // This method controls how a collector handles one or more | |
789 // of its generations being fully allocated. | |
790 virtual HeapWord* satisfy_failed_allocation(size_t size, | |
791 bool is_tlab); | |
792 | |
793 BarrierSet::Name barrier_set_name() { return BarrierSet::G1SATBCTLogging; } | |
794 | |
795 GenRemSet::Name rem_set_name() { return GenRemSet::CardTable; } | |
796 | |
797 // The number of collection pauses so far. | |
798 long n_pauses() const { return _n_pauses; } | |
799 | |
800 // Update the heuristic info to record a collection pause of the given | |
801 // start time, where the given number of bytes were used at the start. | |
802 // This may involve changing the desired size of a collection set. | |
803 | |
804 virtual void record_stop_world_start(); | |
805 | |
806 virtual void record_collection_pause_start(double start_time_sec, | |
807 size_t start_used); | |
808 | |
809 // Must currently be called while the world is stopped. | |
810 virtual void record_concurrent_mark_init_start(); | |
811 virtual void record_concurrent_mark_init_end(); | |
812 void record_concurrent_mark_init_end_pre(double | |
813 mark_init_elapsed_time_ms); | |
814 | |
815 void record_mark_closure_time(double mark_closure_time_ms); | |
816 | |
817 virtual void record_concurrent_mark_remark_start(); | |
818 virtual void record_concurrent_mark_remark_end(); | |
819 | |
820 virtual void record_concurrent_mark_cleanup_start(); | |
821 virtual void record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
822 size_t max_live_bytes); | |
823 virtual void record_concurrent_mark_cleanup_completed(); | |
824 | |
825 virtual void record_concurrent_pause(); | |
826 virtual void record_concurrent_pause_end(); | |
827 | |
828 virtual void record_collection_pause_end_CH_strong_roots(); | |
829 virtual void record_collection_pause_end_G1_strong_roots(); | |
830 | |
677 | 831 virtual void record_collection_pause_end(bool abandoned); |
342 | 832 |
833 // Record the fact that a full collection occurred. | |
834 virtual void record_full_collection_start(); | |
835 virtual void record_full_collection_end(); | |
836 | |
837 void record_ext_root_scan_time(int worker_i, double ms) { | |
838 _par_last_ext_root_scan_times_ms[worker_i] = ms; | |
839 } | |
840 | |
841 void record_mark_stack_scan_time(int worker_i, double ms) { | |
842 _par_last_mark_stack_scan_times_ms[worker_i] = ms; | |
843 } | |
844 | |
845 void record_scan_only_time(int worker_i, double ms, int n) { | |
846 _par_last_scan_only_times_ms[worker_i] = ms; | |
847 _par_last_scan_only_regions_scanned[worker_i] = (double) n; | |
848 } | |
849 | |
850 void record_satb_drain_time(double ms) { | |
851 _cur_satb_drain_time_ms = ms; | |
852 _satb_drain_time_set = true; | |
853 } | |
854 | |
855 void record_satb_drain_processed_buffers (int processed_buffers) { | |
856 _last_satb_drain_processed_buffers = processed_buffers; | |
857 } | |
858 | |
859 void record_mod_union_time(double ms) { | |
860 _all_mod_union_times_ms->add(ms); | |
861 } | |
862 | |
863 void record_update_rs_start_time(int thread, double ms) { | |
864 _par_last_update_rs_start_times_ms[thread] = ms; | |
865 } | |
866 | |
867 void record_update_rs_time(int thread, double ms) { | |
868 _par_last_update_rs_times_ms[thread] = ms; | |
869 } | |
870 | |
871 void record_update_rs_processed_buffers (int thread, | |
872 double processed_buffers) { | |
873 _par_last_update_rs_processed_buffers[thread] = processed_buffers; | |
874 } | |
875 | |
876 void record_scan_rs_start_time(int thread, double ms) { | |
877 _par_last_scan_rs_start_times_ms[thread] = ms; | |
878 } | |
879 | |
880 void record_scan_rs_time(int thread, double ms) { | |
881 _par_last_scan_rs_times_ms[thread] = ms; | |
882 } | |
883 | |
884 void record_scan_new_refs_time(int thread, double ms) { | |
885 _par_last_scan_new_refs_times_ms[thread] = ms; | |
886 } | |
887 | |
888 double get_scan_new_refs_time(int thread) { | |
889 return _par_last_scan_new_refs_times_ms[thread]; | |
890 } | |
891 | |
892 void reset_obj_copy_time(int thread) { | |
893 _par_last_obj_copy_times_ms[thread] = 0.0; | |
894 } | |
895 | |
896 void reset_obj_copy_time() { | |
897 reset_obj_copy_time(0); | |
898 } | |
899 | |
900 void record_obj_copy_time(int thread, double ms) { | |
901 _par_last_obj_copy_times_ms[thread] += ms; | |
902 } | |
903 | |
904 void record_obj_copy_time(double ms) { | |
905 record_obj_copy_time(0, ms); | |
906 } | |
907 | |
908 void record_termination_time(int thread, double ms) { | |
909 _par_last_termination_times_ms[thread] = ms; | |
910 } | |
911 | |
912 void record_termination_time(double ms) { | |
913 record_termination_time(0, ms); | |
914 } | |
915 | |
595
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916 void record_pause_time_ms(double ms) { |
342 | 917 _last_pause_time_ms = ms; |
918 } | |
919 | |
920 void record_clear_ct_time(double ms) { | |
921 _cur_clear_ct_time_ms = ms; | |
922 } | |
923 | |
924 void record_par_time(double ms) { | |
925 _cur_collection_par_time_ms = ms; | |
926 } | |
927 | |
928 void record_aux_start_time(int i) { | |
929 guarantee(i < _aux_num, "should be within range"); | |
930 _cur_aux_start_times_ms[i] = os::elapsedTime() * 1000.0; | |
931 } | |
932 | |
933 void record_aux_end_time(int i) { | |
934 guarantee(i < _aux_num, "should be within range"); | |
935 double ms = os::elapsedTime() * 1000.0 - _cur_aux_start_times_ms[i]; | |
936 _cur_aux_times_set[i] = true; | |
937 _cur_aux_times_ms[i] += ms; | |
938 } | |
939 | |
890
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940 #ifndef PRODUCT |
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941 void record_cc_clear_time(double ms) { |
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942 if (_min_clear_cc_time_ms < 0.0 || ms <= _min_clear_cc_time_ms) |
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943 _min_clear_cc_time_ms = ms; |
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944 if (_max_clear_cc_time_ms < 0.0 || ms >= _max_clear_cc_time_ms) |
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945 _max_clear_cc_time_ms = ms; |
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946 _cur_clear_cc_time_ms = ms; |
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947 _cum_clear_cc_time_ms += ms; |
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948 _num_cc_clears++; |
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949 } |
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950 #endif |
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951 |
342 | 952 // Record the fact that "bytes" bytes allocated in a region. |
953 void record_before_bytes(size_t bytes); | |
954 void record_after_bytes(size_t bytes); | |
955 | |
956 // Returns "true" if this is a good time to do a collection pause. | |
957 // The "word_size" argument, if non-zero, indicates the size of an | |
958 // allocation request that is prompting this query. | |
959 virtual bool should_do_collection_pause(size_t word_size) = 0; | |
960 | |
961 // Choose a new collection set. Marks the chosen regions as being | |
962 // "in_collection_set", and links them together. The head and number of | |
963 // the collection set are available via access methods. | |
677 | 964 virtual void choose_collection_set() = 0; |
342 | 965 |
966 void clear_collection_set() { _collection_set = NULL; } | |
967 | |
968 // The head of the list (via "next_in_collection_set()") representing the | |
969 // current collection set. | |
970 HeapRegion* collection_set() { return _collection_set; } | |
971 | |
972 // The number of elements in the current collection set. | |
973 size_t collection_set_size() { return _collection_set_size; } | |
974 | |
975 // Add "hr" to the CS. | |
976 void add_to_collection_set(HeapRegion* hr); | |
977 | |
978 bool should_initiate_conc_mark() { return _should_initiate_conc_mark; } | |
979 void set_should_initiate_conc_mark() { _should_initiate_conc_mark = true; } | |
980 void unset_should_initiate_conc_mark(){ _should_initiate_conc_mark = false; } | |
981 | |
982 // If an expansion would be appropriate, because recent GC overhead had | |
983 // exceeded the desired limit, return an amount to expand by. | |
984 virtual size_t expansion_amount(); | |
985 | |
986 // note start of mark thread | |
987 void note_start_of_mark_thread(); | |
988 | |
989 // The marked bytes of the "r" has changed; reclassify it's desirability | |
990 // for marking. Also asserts that "r" is eligible for a CS. | |
991 virtual void note_change_in_marked_bytes(HeapRegion* r) = 0; | |
992 | |
993 #ifndef PRODUCT | |
994 // Check any appropriate marked bytes info, asserting false if | |
995 // something's wrong, else returning "true". | |
996 virtual bool assertMarkedBytesDataOK() = 0; | |
997 #endif | |
998 | |
999 // Print tracing information. | |
1000 void print_tracing_info() const; | |
1001 | |
1002 // Print stats on young survival ratio | |
1003 void print_yg_surv_rate_info() const; | |
1004 | |
545 | 1005 void finished_recalculating_age_indexes(bool is_survivors) { |
1006 if (is_survivors) { | |
1007 _survivor_surv_rate_group->finished_recalculating_age_indexes(); | |
1008 } else { | |
1009 _short_lived_surv_rate_group->finished_recalculating_age_indexes(); | |
1010 } | |
342 | 1011 // do that for any other surv rate groups |
1012 } | |
1013 | |
1014 bool should_add_next_region_to_young_list(); | |
1015 | |
1016 bool in_young_gc_mode() { | |
1017 return _in_young_gc_mode; | |
1018 } | |
1019 void set_in_young_gc_mode(bool in_young_gc_mode) { | |
1020 _in_young_gc_mode = in_young_gc_mode; | |
1021 } | |
1022 | |
1023 bool full_young_gcs() { | |
1024 return _full_young_gcs; | |
1025 } | |
1026 void set_full_young_gcs(bool full_young_gcs) { | |
1027 _full_young_gcs = full_young_gcs; | |
1028 } | |
1029 | |
1030 bool adaptive_young_list_length() { | |
1031 return _adaptive_young_list_length; | |
1032 } | |
1033 void set_adaptive_young_list_length(bool adaptive_young_list_length) { | |
1034 _adaptive_young_list_length = adaptive_young_list_length; | |
1035 } | |
1036 | |
1037 inline double get_gc_eff_factor() { | |
1038 double ratio = _known_garbage_ratio; | |
1039 | |
1040 double square = ratio * ratio; | |
1041 // square = square * square; | |
1042 double ret = square * 9.0 + 1.0; | |
1043 #if 0 | |
1044 gclog_or_tty->print_cr("ratio = %1.2lf, ret = %1.2lf", ratio, ret); | |
1045 #endif // 0 | |
1046 guarantee(0.0 <= ret && ret < 10.0, "invariant!"); | |
1047 return ret; | |
1048 } | |
1049 | |
1050 // | |
1051 // Survivor regions policy. | |
1052 // | |
1053 protected: | |
1054 | |
1055 // Current tenuring threshold, set to 0 if the collector reaches the | |
1056 // maximum amount of suvivors regions. | |
1057 int _tenuring_threshold; | |
1058 | |
545 | 1059 // The limit on the number of regions allocated for survivors. |
1060 size_t _max_survivor_regions; | |
1061 | |
1062 // The amount of survor regions after a collection. | |
1063 size_t _recorded_survivor_regions; | |
1064 // List of survivor regions. | |
1065 HeapRegion* _recorded_survivor_head; | |
1066 HeapRegion* _recorded_survivor_tail; | |
1067 | |
1068 ageTable _survivors_age_table; | |
1069 | |
342 | 1070 public: |
1071 | |
1072 inline GCAllocPurpose | |
1073 evacuation_destination(HeapRegion* src_region, int age, size_t word_sz) { | |
1074 if (age < _tenuring_threshold && src_region->is_young()) { | |
1075 return GCAllocForSurvived; | |
1076 } else { | |
1077 return GCAllocForTenured; | |
1078 } | |
1079 } | |
1080 | |
1081 inline bool track_object_age(GCAllocPurpose purpose) { | |
1082 return purpose == GCAllocForSurvived; | |
1083 } | |
1084 | |
1085 inline GCAllocPurpose alternative_purpose(int purpose) { | |
1086 return GCAllocForTenured; | |
1087 } | |
1088 | |
545 | 1089 static const size_t REGIONS_UNLIMITED = ~(size_t)0; |
1090 | |
1091 size_t max_regions(int purpose); | |
342 | 1092 |
1093 // The limit on regions for a particular purpose is reached. | |
1094 void note_alloc_region_limit_reached(int purpose) { | |
1095 if (purpose == GCAllocForSurvived) { | |
1096 _tenuring_threshold = 0; | |
1097 } | |
1098 } | |
1099 | |
1100 void note_start_adding_survivor_regions() { | |
1101 _survivor_surv_rate_group->start_adding_regions(); | |
1102 } | |
1103 | |
1104 void note_stop_adding_survivor_regions() { | |
1105 _survivor_surv_rate_group->stop_adding_regions(); | |
1106 } | |
545 | 1107 |
1108 void record_survivor_regions(size_t regions, | |
1109 HeapRegion* head, | |
1110 HeapRegion* tail) { | |
1111 _recorded_survivor_regions = regions; | |
1112 _recorded_survivor_head = head; | |
1113 _recorded_survivor_tail = tail; | |
1114 } | |
1115 | |
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1116 size_t recorded_survivor_regions() { |
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1117 return _recorded_survivor_regions; |
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1118 } |
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1119 |
545 | 1120 void record_thread_age_table(ageTable* age_table) |
1121 { | |
1122 _survivors_age_table.merge_par(age_table); | |
1123 } | |
1124 | |
1125 // Calculates survivor space parameters. | |
1126 void calculate_survivors_policy(); | |
1127 | |
342 | 1128 }; |
1129 | |
1130 // This encapsulates a particular strategy for a g1 Collector. | |
1131 // | |
1132 // Start a concurrent mark when our heap size is n bytes | |
1133 // greater then our heap size was at the last concurrent | |
1134 // mark. Where n is a function of the CMSTriggerRatio | |
1135 // and the MinHeapFreeRatio. | |
1136 // | |
1137 // Start a g1 collection pause when we have allocated the | |
1138 // average number of bytes currently being freed in | |
1139 // a collection, but only if it is at least one region | |
1140 // full | |
1141 // | |
1142 // Resize Heap based on desired | |
1143 // allocation space, where desired allocation space is | |
1144 // a function of survival rate and desired future to size. | |
1145 // | |
1146 // Choose collection set by first picking all older regions | |
1147 // which have a survival rate which beats our projected young | |
1148 // survival rate. Then fill out the number of needed regions | |
1149 // with young regions. | |
1150 | |
1151 class G1CollectorPolicy_BestRegionsFirst: public G1CollectorPolicy { | |
1152 CollectionSetChooser* _collectionSetChooser; | |
1153 // If the estimated is less then desirable, resize if possible. | |
1154 void expand_if_possible(size_t numRegions); | |
1155 | |
677 | 1156 virtual void choose_collection_set(); |
342 | 1157 virtual void record_collection_pause_start(double start_time_sec, |
1158 size_t start_used); | |
1159 virtual void record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
1160 size_t max_live_bytes); | |
1161 virtual void record_full_collection_end(); | |
1162 | |
1163 public: | |
1164 G1CollectorPolicy_BestRegionsFirst() { | |
1165 _collectionSetChooser = new CollectionSetChooser(); | |
1166 } | |
677 | 1167 void record_collection_pause_end(bool abandoned); |
342 | 1168 bool should_do_collection_pause(size_t word_size); |
1169 // This is not needed any more, after the CSet choosing code was | |
1170 // changed to use the pause prediction work. But let's leave the | |
1171 // hook in just in case. | |
1172 void note_change_in_marked_bytes(HeapRegion* r) { } | |
1173 #ifndef PRODUCT | |
1174 bool assertMarkedBytesDataOK(); | |
1175 #endif | |
1176 }; | |
1177 | |
1178 // This should move to some place more general... | |
1179 | |
1180 // If we have "n" measurements, and we've kept track of their "sum" and the | |
1181 // "sum_of_squares" of the measurements, this returns the variance of the | |
1182 // sequence. | |
1183 inline double variance(int n, double sum_of_squares, double sum) { | |
1184 double n_d = (double)n; | |
1185 double avg = sum/n_d; | |
1186 return (sum_of_squares - 2.0 * avg * sum + n_d * avg * avg) / n_d; | |
1187 } | |
1188 | |
1189 // Local Variables: *** | |
1190 // c-indentation-style: gnu *** | |
1191 // End: *** |