Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.hpp @ 1707:0ce1569c90e5
6963209: G1: remove the concept of abandoned pauses
Summary: As part of 6944166 we disabled the concept of abandoned pauses (i.e., if the collection set is empty, we would still try to do a pause even if it is to update the RSets and scan the roots). This changeset removes the code and structures associated with abandoned pauses.
Reviewed-by: iveresov, johnc
author | tonyp |
---|---|
date | Wed, 04 Aug 2010 13:03:23 -0400 |
parents | 2d160770d2e5 |
children | f95d63e2154a |
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 | |
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 | |
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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 | |
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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(update_rs) | |
65 define_num_seq(scan_rs) | |
66 define_num_seq(obj_copy) | |
67 define_num_seq(termination) // parallel only | |
68 define_num_seq(parallel_other) // parallel only | |
69 define_num_seq(mark_closure) | |
70 define_num_seq(clear_ct) // parallel only | |
71 }; | |
72 | |
677 | 73 class Summary: public PauseSummary, |
74 public MainBodySummary { | |
342 | 75 public: |
76 virtual MainBodySummary* main_body_summary() { return this; } | |
77 }; | |
78 | |
79 class G1CollectorPolicy: public CollectorPolicy { | |
80 protected: | |
81 // The number of pauses during the execution. | |
82 long _n_pauses; | |
83 | |
84 // either equal to the number of parallel threads, if ParallelGCThreads | |
85 // has been set, or 1 otherwise | |
86 int _parallel_gc_threads; | |
87 | |
88 enum SomePrivateConstants { | |
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89 NumPrevPausesForHeuristics = 10 |
342 | 90 }; |
91 | |
92 G1MMUTracker* _mmu_tracker; | |
93 | |
94 void initialize_flags(); | |
95 | |
96 void initialize_all() { | |
97 initialize_flags(); | |
98 initialize_size_info(); | |
99 initialize_perm_generation(PermGen::MarkSweepCompact); | |
100 } | |
101 | |
102 virtual size_t default_init_heap_size() { | |
103 // Pick some reasonable default. | |
104 return 8*M; | |
105 } | |
106 | |
107 double _cur_collection_start_sec; | |
108 size_t _cur_collection_pause_used_at_start_bytes; | |
109 size_t _cur_collection_pause_used_regions_at_start; | |
110 size_t _prev_collection_pause_used_at_end_bytes; | |
111 double _cur_collection_par_time_ms; | |
112 double _cur_satb_drain_time_ms; | |
113 double _cur_clear_ct_time_ms; | |
114 bool _satb_drain_time_set; | |
115 | |
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116 #ifndef PRODUCT |
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117 // Card Table Count Cache stats |
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118 double _min_clear_cc_time_ms; // min |
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119 double _max_clear_cc_time_ms; // max |
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120 double _cur_clear_cc_time_ms; // clearing time during current pause |
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121 double _cum_clear_cc_time_ms; // cummulative clearing time |
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122 jlong _num_cc_clears; // number of times the card count cache has been cleared |
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123 #endif |
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124 |
342 | 125 double _cur_CH_strong_roots_end_sec; |
126 double _cur_CH_strong_roots_dur_ms; | |
127 double _cur_G1_strong_roots_end_sec; | |
128 double _cur_G1_strong_roots_dur_ms; | |
129 | |
130 // Statistics for recent GC pauses. See below for how indexed. | |
131 TruncatedSeq* _recent_CH_strong_roots_times_ms; | |
132 TruncatedSeq* _recent_G1_strong_roots_times_ms; | |
133 TruncatedSeq* _recent_evac_times_ms; | |
134 // These exclude marking times. | |
135 TruncatedSeq* _recent_pause_times_ms; | |
136 TruncatedSeq* _recent_gc_times_ms; | |
137 | |
138 TruncatedSeq* _recent_CS_bytes_used_before; | |
139 TruncatedSeq* _recent_CS_bytes_surviving; | |
140 | |
141 TruncatedSeq* _recent_rs_sizes; | |
142 | |
143 TruncatedSeq* _concurrent_mark_init_times_ms; | |
144 TruncatedSeq* _concurrent_mark_remark_times_ms; | |
145 TruncatedSeq* _concurrent_mark_cleanup_times_ms; | |
146 | |
677 | 147 Summary* _summary; |
342 | 148 |
149 NumberSeq* _all_pause_times_ms; | |
150 NumberSeq* _all_full_gc_times_ms; | |
151 double _stop_world_start; | |
152 NumberSeq* _all_stop_world_times_ms; | |
153 NumberSeq* _all_yield_times_ms; | |
154 | |
155 size_t _region_num_young; | |
156 size_t _region_num_tenured; | |
157 size_t _prev_region_num_young; | |
158 size_t _prev_region_num_tenured; | |
159 | |
160 NumberSeq* _all_mod_union_times_ms; | |
161 | |
162 int _aux_num; | |
163 NumberSeq* _all_aux_times_ms; | |
164 double* _cur_aux_start_times_ms; | |
165 double* _cur_aux_times_ms; | |
166 bool* _cur_aux_times_set; | |
167 | |
1611 | 168 double* _par_last_gc_worker_start_times_ms; |
342 | 169 double* _par_last_ext_root_scan_times_ms; |
170 double* _par_last_mark_stack_scan_times_ms; | |
171 double* _par_last_update_rs_times_ms; | |
172 double* _par_last_update_rs_processed_buffers; | |
173 double* _par_last_scan_rs_times_ms; | |
174 double* _par_last_obj_copy_times_ms; | |
175 double* _par_last_termination_times_ms; | |
1611 | 176 double* _par_last_termination_attempts; |
177 double* _par_last_gc_worker_end_times_ms; | |
342 | 178 |
179 // indicates that we are in young GC mode | |
180 bool _in_young_gc_mode; | |
181 | |
182 // indicates whether we are in full young or partially young GC mode | |
183 bool _full_young_gcs; | |
184 | |
185 // if true, then it tries to dynamically adjust the length of the | |
186 // young list | |
187 bool _adaptive_young_list_length; | |
188 size_t _young_list_min_length; | |
189 size_t _young_list_target_length; | |
190 size_t _young_list_fixed_length; | |
191 | |
192 size_t _young_cset_length; | |
193 bool _last_young_gc_full; | |
194 | |
195 unsigned _full_young_pause_num; | |
196 unsigned _partial_young_pause_num; | |
197 | |
198 bool _during_marking; | |
199 bool _in_marking_window; | |
200 bool _in_marking_window_im; | |
201 | |
202 SurvRateGroup* _short_lived_surv_rate_group; | |
203 SurvRateGroup* _survivor_surv_rate_group; | |
204 // add here any more surv rate groups | |
205 | |
1356 | 206 double _gc_overhead_perc; |
207 | |
342 | 208 bool during_marking() { |
209 return _during_marking; | |
210 } | |
211 | |
212 // <NEW PREDICTION> | |
213 | |
214 private: | |
215 enum PredictionConstants { | |
216 TruncatedSeqLength = 10 | |
217 }; | |
218 | |
219 TruncatedSeq* _alloc_rate_ms_seq; | |
220 double _prev_collection_pause_end_ms; | |
221 | |
222 TruncatedSeq* _pending_card_diff_seq; | |
223 TruncatedSeq* _rs_length_diff_seq; | |
224 TruncatedSeq* _cost_per_card_ms_seq; | |
225 TruncatedSeq* _fully_young_cards_per_entry_ratio_seq; | |
226 TruncatedSeq* _partially_young_cards_per_entry_ratio_seq; | |
227 TruncatedSeq* _cost_per_entry_ms_seq; | |
228 TruncatedSeq* _partially_young_cost_per_entry_ms_seq; | |
229 TruncatedSeq* _cost_per_byte_ms_seq; | |
230 TruncatedSeq* _constant_other_time_ms_seq; | |
231 TruncatedSeq* _young_other_cost_per_region_ms_seq; | |
232 TruncatedSeq* _non_young_other_cost_per_region_ms_seq; | |
233 | |
234 TruncatedSeq* _pending_cards_seq; | |
235 TruncatedSeq* _scanned_cards_seq; | |
236 TruncatedSeq* _rs_lengths_seq; | |
237 | |
238 TruncatedSeq* _cost_per_byte_ms_during_cm_seq; | |
239 | |
240 TruncatedSeq* _young_gc_eff_seq; | |
241 | |
242 TruncatedSeq* _max_conc_overhead_seq; | |
243 | |
244 size_t _recorded_young_regions; | |
245 size_t _recorded_non_young_regions; | |
246 size_t _recorded_region_num; | |
247 | |
248 size_t _free_regions_at_end_of_collection; | |
249 | |
250 size_t _recorded_rs_lengths; | |
251 size_t _max_rs_lengths; | |
252 | |
253 size_t _recorded_marked_bytes; | |
254 size_t _recorded_young_bytes; | |
255 | |
256 size_t _predicted_pending_cards; | |
257 size_t _predicted_cards_scanned; | |
258 size_t _predicted_rs_lengths; | |
259 size_t _predicted_bytes_to_copy; | |
260 | |
261 double _predicted_survival_ratio; | |
262 double _predicted_rs_update_time_ms; | |
263 double _predicted_rs_scan_time_ms; | |
264 double _predicted_object_copy_time_ms; | |
265 double _predicted_constant_other_time_ms; | |
266 double _predicted_young_other_time_ms; | |
267 double _predicted_non_young_other_time_ms; | |
268 double _predicted_pause_time_ms; | |
269 | |
270 double _vtime_diff_ms; | |
271 | |
272 double _recorded_young_free_cset_time_ms; | |
273 double _recorded_non_young_free_cset_time_ms; | |
274 | |
275 double _sigma; | |
276 double _expensive_region_limit_ms; | |
277 | |
278 size_t _rs_lengths_prediction; | |
279 | |
280 size_t _known_garbage_bytes; | |
281 double _known_garbage_ratio; | |
282 | |
283 double sigma() { | |
284 return _sigma; | |
285 } | |
286 | |
287 // A function that prevents us putting too much stock in small sample | |
288 // sets. Returns a number between 2.0 and 1.0, depending on the number | |
289 // of samples. 5 or more samples yields one; fewer scales linearly from | |
290 // 2.0 at 1 sample to 1.0 at 5. | |
291 double confidence_factor(int samples) { | |
292 if (samples > 4) return 1.0; | |
293 else return 1.0 + sigma() * ((double)(5 - samples))/2.0; | |
294 } | |
295 | |
296 double get_new_neg_prediction(TruncatedSeq* seq) { | |
297 return seq->davg() - sigma() * seq->dsd(); | |
298 } | |
299 | |
300 #ifndef PRODUCT | |
301 bool verify_young_ages(HeapRegion* head, SurvRateGroup *surv_rate_group); | |
302 #endif // PRODUCT | |
303 | |
1111 | 304 void adjust_concurrent_refinement(double update_rs_time, |
305 double update_rs_processed_buffers, | |
306 double goal_ms); | |
307 | |
342 | 308 protected: |
309 double _pause_time_target_ms; | |
310 double _recorded_young_cset_choice_time_ms; | |
311 double _recorded_non_young_cset_choice_time_ms; | |
312 bool _within_target; | |
313 size_t _pending_cards; | |
314 size_t _max_pending_cards; | |
315 | |
316 public: | |
317 | |
318 void set_region_short_lived(HeapRegion* hr) { | |
319 hr->install_surv_rate_group(_short_lived_surv_rate_group); | |
320 } | |
321 | |
322 void set_region_survivors(HeapRegion* hr) { | |
323 hr->install_surv_rate_group(_survivor_surv_rate_group); | |
324 } | |
325 | |
326 #ifndef PRODUCT | |
327 bool verify_young_ages(); | |
328 #endif // PRODUCT | |
329 | |
330 double get_new_prediction(TruncatedSeq* seq) { | |
331 return MAX2(seq->davg() + sigma() * seq->dsd(), | |
332 seq->davg() * confidence_factor(seq->num())); | |
333 } | |
334 | |
335 size_t young_cset_length() { | |
336 return _young_cset_length; | |
337 } | |
338 | |
339 void record_max_rs_lengths(size_t rs_lengths) { | |
340 _max_rs_lengths = rs_lengths; | |
341 } | |
342 | |
343 size_t predict_pending_card_diff() { | |
344 double prediction = get_new_neg_prediction(_pending_card_diff_seq); | |
345 if (prediction < 0.00001) | |
346 return 0; | |
347 else | |
348 return (size_t) prediction; | |
349 } | |
350 | |
351 size_t predict_pending_cards() { | |
352 size_t max_pending_card_num = _g1->max_pending_card_num(); | |
353 size_t diff = predict_pending_card_diff(); | |
354 size_t prediction; | |
355 if (diff > max_pending_card_num) | |
356 prediction = max_pending_card_num; | |
357 else | |
358 prediction = max_pending_card_num - diff; | |
359 | |
360 return prediction; | |
361 } | |
362 | |
363 size_t predict_rs_length_diff() { | |
364 return (size_t) get_new_prediction(_rs_length_diff_seq); | |
365 } | |
366 | |
367 double predict_alloc_rate_ms() { | |
368 return get_new_prediction(_alloc_rate_ms_seq); | |
369 } | |
370 | |
371 double predict_cost_per_card_ms() { | |
372 return get_new_prediction(_cost_per_card_ms_seq); | |
373 } | |
374 | |
375 double predict_rs_update_time_ms(size_t pending_cards) { | |
376 return (double) pending_cards * predict_cost_per_card_ms(); | |
377 } | |
378 | |
379 double predict_fully_young_cards_per_entry_ratio() { | |
380 return get_new_prediction(_fully_young_cards_per_entry_ratio_seq); | |
381 } | |
382 | |
383 double predict_partially_young_cards_per_entry_ratio() { | |
384 if (_partially_young_cards_per_entry_ratio_seq->num() < 2) | |
385 return predict_fully_young_cards_per_entry_ratio(); | |
386 else | |
387 return get_new_prediction(_partially_young_cards_per_entry_ratio_seq); | |
388 } | |
389 | |
390 size_t predict_young_card_num(size_t rs_length) { | |
391 return (size_t) ((double) rs_length * | |
392 predict_fully_young_cards_per_entry_ratio()); | |
393 } | |
394 | |
395 size_t predict_non_young_card_num(size_t rs_length) { | |
396 return (size_t) ((double) rs_length * | |
397 predict_partially_young_cards_per_entry_ratio()); | |
398 } | |
399 | |
400 double predict_rs_scan_time_ms(size_t card_num) { | |
401 if (full_young_gcs()) | |
402 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); | |
403 else | |
404 return predict_partially_young_rs_scan_time_ms(card_num); | |
405 } | |
406 | |
407 double predict_partially_young_rs_scan_time_ms(size_t card_num) { | |
408 if (_partially_young_cost_per_entry_ms_seq->num() < 3) | |
409 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); | |
410 else | |
411 return (double) card_num * | |
412 get_new_prediction(_partially_young_cost_per_entry_ms_seq); | |
413 } | |
414 | |
415 double predict_object_copy_time_ms_during_cm(size_t bytes_to_copy) { | |
416 if (_cost_per_byte_ms_during_cm_seq->num() < 3) | |
417 return 1.1 * (double) bytes_to_copy * | |
418 get_new_prediction(_cost_per_byte_ms_seq); | |
419 else | |
420 return (double) bytes_to_copy * | |
421 get_new_prediction(_cost_per_byte_ms_during_cm_seq); | |
422 } | |
423 | |
424 double predict_object_copy_time_ms(size_t bytes_to_copy) { | |
425 if (_in_marking_window && !_in_marking_window_im) | |
426 return predict_object_copy_time_ms_during_cm(bytes_to_copy); | |
427 else | |
428 return (double) bytes_to_copy * | |
429 get_new_prediction(_cost_per_byte_ms_seq); | |
430 } | |
431 | |
432 double predict_constant_other_time_ms() { | |
433 return get_new_prediction(_constant_other_time_ms_seq); | |
434 } | |
435 | |
436 double predict_young_other_time_ms(size_t young_num) { | |
437 return | |
438 (double) young_num * | |
439 get_new_prediction(_young_other_cost_per_region_ms_seq); | |
440 } | |
441 | |
442 double predict_non_young_other_time_ms(size_t non_young_num) { | |
443 return | |
444 (double) non_young_num * | |
445 get_new_prediction(_non_young_other_cost_per_region_ms_seq); | |
446 } | |
447 | |
448 void check_if_region_is_too_expensive(double predicted_time_ms); | |
449 | |
450 double predict_young_collection_elapsed_time_ms(size_t adjustment); | |
451 double predict_base_elapsed_time_ms(size_t pending_cards); | |
452 double predict_base_elapsed_time_ms(size_t pending_cards, | |
453 size_t scanned_cards); | |
454 size_t predict_bytes_to_copy(HeapRegion* hr); | |
455 double predict_region_elapsed_time_ms(HeapRegion* hr, bool young); | |
456 | |
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457 // for use by: calculate_young_list_target_length(rs_length) |
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458 bool predict_will_fit(size_t young_region_num, |
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459 double base_time_ms, |
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460 size_t init_free_regions, |
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461 double target_pause_time_ms); |
342 | 462 |
463 void start_recording_regions(); | |
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464 void record_cset_region_info(HeapRegion* hr, bool young); |
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465 void record_non_young_cset_region(HeapRegion* hr); |
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466 |
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467 void set_recorded_young_regions(size_t n_regions); |
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468 void set_recorded_young_bytes(size_t bytes); |
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469 void set_recorded_rs_lengths(size_t rs_lengths); |
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470 void set_predicted_bytes_to_copy(size_t bytes); |
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471 |
342 | 472 void end_recording_regions(); |
473 | |
474 void record_vtime_diff_ms(double vtime_diff_ms) { | |
475 _vtime_diff_ms = vtime_diff_ms; | |
476 } | |
477 | |
478 void record_young_free_cset_time_ms(double time_ms) { | |
479 _recorded_young_free_cset_time_ms = time_ms; | |
480 } | |
481 | |
482 void record_non_young_free_cset_time_ms(double time_ms) { | |
483 _recorded_non_young_free_cset_time_ms = time_ms; | |
484 } | |
485 | |
486 double predict_young_gc_eff() { | |
487 return get_new_neg_prediction(_young_gc_eff_seq); | |
488 } | |
489 | |
545 | 490 double predict_survivor_regions_evac_time(); |
491 | |
342 | 492 // </NEW PREDICTION> |
493 | |
494 public: | |
495 void cset_regions_freed() { | |
496 bool propagate = _last_young_gc_full && !_in_marking_window; | |
497 _short_lived_surv_rate_group->all_surviving_words_recorded(propagate); | |
498 _survivor_surv_rate_group->all_surviving_words_recorded(propagate); | |
499 // also call it on any more surv rate groups | |
500 } | |
501 | |
502 void set_known_garbage_bytes(size_t known_garbage_bytes) { | |
503 _known_garbage_bytes = known_garbage_bytes; | |
504 size_t heap_bytes = _g1->capacity(); | |
505 _known_garbage_ratio = (double) _known_garbage_bytes / (double) heap_bytes; | |
506 } | |
507 | |
508 void decrease_known_garbage_bytes(size_t known_garbage_bytes) { | |
509 guarantee( _known_garbage_bytes >= known_garbage_bytes, "invariant" ); | |
510 | |
511 _known_garbage_bytes -= known_garbage_bytes; | |
512 size_t heap_bytes = _g1->capacity(); | |
513 _known_garbage_ratio = (double) _known_garbage_bytes / (double) heap_bytes; | |
514 } | |
515 | |
516 G1MMUTracker* mmu_tracker() { | |
517 return _mmu_tracker; | |
518 } | |
519 | |
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520 double max_pause_time_ms() { |
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521 return _mmu_tracker->max_gc_time() * 1000.0; |
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522 } |
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523 |
342 | 524 double predict_init_time_ms() { |
525 return get_new_prediction(_concurrent_mark_init_times_ms); | |
526 } | |
527 | |
528 double predict_remark_time_ms() { | |
529 return get_new_prediction(_concurrent_mark_remark_times_ms); | |
530 } | |
531 | |
532 double predict_cleanup_time_ms() { | |
533 return get_new_prediction(_concurrent_mark_cleanup_times_ms); | |
534 } | |
535 | |
536 // Returns an estimate of the survival rate of the region at yg-age | |
537 // "yg_age". | |
545 | 538 double predict_yg_surv_rate(int age, SurvRateGroup* surv_rate_group) { |
539 TruncatedSeq* seq = surv_rate_group->get_seq(age); | |
342 | 540 if (seq->num() == 0) |
541 gclog_or_tty->print("BARF! age is %d", age); | |
542 guarantee( seq->num() > 0, "invariant" ); | |
543 double pred = get_new_prediction(seq); | |
544 if (pred > 1.0) | |
545 pred = 1.0; | |
546 return pred; | |
547 } | |
548 | |
545 | 549 double predict_yg_surv_rate(int age) { |
550 return predict_yg_surv_rate(age, _short_lived_surv_rate_group); | |
551 } | |
552 | |
342 | 553 double accum_yg_surv_rate_pred(int age) { |
554 return _short_lived_surv_rate_group->accum_surv_rate_pred(age); | |
555 } | |
556 | |
557 protected: | |
1611 | 558 void print_stats(int level, const char* str, double value); |
559 void print_stats(int level, const char* str, int value); | |
560 | |
561 void print_par_stats(int level, const char* str, double* data) { | |
342 | 562 print_par_stats(level, str, data, true); |
563 } | |
1611 | 564 void print_par_stats(int level, const char* str, double* data, bool summary); |
565 void print_par_sizes(int level, const char* str, double* data, bool summary); | |
342 | 566 |
567 void check_other_times(int level, | |
568 NumberSeq* other_times_ms, | |
569 NumberSeq* calc_other_times_ms) const; | |
570 | |
571 void print_summary (PauseSummary* stats) const; | |
572 | |
573 void print_summary (int level, const char* str, NumberSeq* seq) const; | |
574 void print_summary_sd (int level, const char* str, NumberSeq* seq) const; | |
575 | |
576 double avg_value (double* data); | |
577 double max_value (double* data); | |
578 double sum_of_values (double* data); | |
579 double max_sum (double* data1, double* data2); | |
580 | |
581 int _last_satb_drain_processed_buffers; | |
582 int _last_update_rs_processed_buffers; | |
583 double _last_pause_time_ms; | |
584 | |
585 size_t _bytes_in_to_space_before_gc; | |
586 size_t _bytes_in_to_space_after_gc; | |
587 size_t bytes_in_to_space_during_gc() { | |
588 return | |
589 _bytes_in_to_space_after_gc - _bytes_in_to_space_before_gc; | |
590 } | |
591 size_t _bytes_in_collection_set_before_gc; | |
592 // Used to count used bytes in CS. | |
593 friend class CountCSClosure; | |
594 | |
595 // Statistics kept per GC stoppage, pause or full. | |
596 TruncatedSeq* _recent_prev_end_times_for_all_gcs_sec; | |
597 | |
598 // We track markings. | |
599 int _num_markings; | |
600 double _mark_thread_startup_sec; // Time at startup of marking thread | |
601 | |
602 // Add a new GC of the given duration and end time to the record. | |
603 void update_recent_gc_times(double end_time_sec, double elapsed_ms); | |
604 | |
605 // The head of the list (via "next_in_collection_set()") representing the | |
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606 // current collection set. Set from the incrementally built collection |
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607 // set at the start of the pause. |
342 | 608 HeapRegion* _collection_set; |
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609 |
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610 // The number of regions in the collection set. Set from the incrementally |
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611 // built collection set at the start of an evacuation pause. |
342 | 612 size_t _collection_set_size; |
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613 |
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614 // The number of bytes in the collection set before the pause. Set from |
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615 // the incrementally built collection set at the start of an evacuation |
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616 // pause. |
342 | 617 size_t _collection_set_bytes_used_before; |
618 | |
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619 // The associated information that is maintained while the incremental |
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620 // collection set is being built with young regions. Used to populate |
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621 // the recorded info for the evacuation pause. |
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622 |
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623 enum CSetBuildType { |
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624 Active, // We are actively building the collection set |
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625 Inactive // We are not actively building the collection set |
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626 }; |
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627 |
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628 CSetBuildType _inc_cset_build_state; |
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629 |
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630 // The head of the incrementally built collection set. |
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631 HeapRegion* _inc_cset_head; |
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632 |
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633 // The tail of the incrementally built collection set. |
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634 HeapRegion* _inc_cset_tail; |
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635 |
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636 // The number of regions in the incrementally built collection set. |
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637 // Used to set _collection_set_size at the start of an evacuation |
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638 // pause. |
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639 size_t _inc_cset_size; |
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640 |
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641 // Used as the index in the surving young words structure |
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642 // which tracks the amount of space, for each young region, |
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643 // that survives the pause. |
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644 size_t _inc_cset_young_index; |
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645 |
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646 // The number of bytes in the incrementally built collection set. |
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647 // Used to set _collection_set_bytes_used_before at the start of |
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648 // an evacuation pause. |
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649 size_t _inc_cset_bytes_used_before; |
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650 |
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651 // Used to record the highest end of heap region in collection set |
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652 HeapWord* _inc_cset_max_finger; |
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653 |
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654 // The number of recorded used bytes in the young regions |
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655 // of the collection set. This is the sum of the used() bytes |
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656 // of retired young regions in the collection set. |
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657 size_t _inc_cset_recorded_young_bytes; |
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658 |
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659 // The RSet lengths recorded for regions in the collection set |
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660 // (updated by the periodic sampling of the regions in the |
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661 // young list/collection set). |
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662 size_t _inc_cset_recorded_rs_lengths; |
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663 |
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664 // The predicted elapsed time it will take to collect the regions |
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665 // in the collection set (updated by the periodic sampling of the |
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666 // regions in the young list/collection set). |
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667 double _inc_cset_predicted_elapsed_time_ms; |
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668 |
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669 // The predicted bytes to copy for the regions in the collection |
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670 // set (updated by the periodic sampling of the regions in the |
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671 // young list/collection set). |
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672 size_t _inc_cset_predicted_bytes_to_copy; |
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673 |
342 | 674 // Info about marking. |
675 int _n_marks; // Sticky at 2, so we know when we've done at least 2. | |
676 | |
677 // The number of collection pauses at the end of the last mark. | |
678 size_t _n_pauses_at_mark_end; | |
679 | |
680 // Stash a pointer to the g1 heap. | |
681 G1CollectedHeap* _g1; | |
682 | |
683 // The average time in ms per collection pause, averaged over recent pauses. | |
684 double recent_avg_time_for_pauses_ms(); | |
685 | |
686 // The average time in ms for processing CollectedHeap strong roots, per | |
687 // collection pause, averaged over recent pauses. | |
688 double recent_avg_time_for_CH_strong_ms(); | |
689 | |
690 // The average time in ms for processing the G1 remembered set, per | |
691 // pause, averaged over recent pauses. | |
692 double recent_avg_time_for_G1_strong_ms(); | |
693 | |
694 // The average time in ms for "evacuating followers", per pause, averaged | |
695 // over recent pauses. | |
696 double recent_avg_time_for_evac_ms(); | |
697 | |
698 // The number of "recent" GCs recorded in the number sequences | |
699 int number_of_recent_gcs(); | |
700 | |
701 // The average survival ratio, computed by the total number of bytes | |
702 // suriviving / total number of bytes before collection over the last | |
703 // several recent pauses. | |
704 double recent_avg_survival_fraction(); | |
705 // The survival fraction of the most recent pause; if there have been no | |
706 // pauses, returns 1.0. | |
707 double last_survival_fraction(); | |
708 | |
709 // Returns a "conservative" estimate of the recent survival rate, i.e., | |
710 // one that may be higher than "recent_avg_survival_fraction". | |
711 // This is conservative in several ways: | |
712 // If there have been few pauses, it will assume a potential high | |
713 // variance, and err on the side of caution. | |
714 // It puts a lower bound (currently 0.1) on the value it will return. | |
715 // To try to detect phase changes, if the most recent pause ("latest") has a | |
716 // higher-than average ("avg") survival rate, it returns that rate. | |
717 // "work" version is a utility function; young is restricted to young regions. | |
718 double conservative_avg_survival_fraction_work(double avg, | |
719 double latest); | |
720 | |
721 // The arguments are the two sequences that keep track of the number of bytes | |
722 // surviving and the total number of bytes before collection, resp., | |
723 // over the last evereal recent pauses | |
724 // Returns the survival rate for the category in the most recent pause. | |
725 // If there have been no pauses, returns 1.0. | |
726 double last_survival_fraction_work(TruncatedSeq* surviving, | |
727 TruncatedSeq* before); | |
728 | |
729 // The arguments are the two sequences that keep track of the number of bytes | |
730 // surviving and the total number of bytes before collection, resp., | |
731 // over the last several recent pauses | |
732 // Returns the average survival ration over the last several recent pauses | |
733 // If there have been no pauses, return 1.0 | |
734 double recent_avg_survival_fraction_work(TruncatedSeq* surviving, | |
735 TruncatedSeq* before); | |
736 | |
737 double conservative_avg_survival_fraction() { | |
738 double avg = recent_avg_survival_fraction(); | |
739 double latest = last_survival_fraction(); | |
740 return conservative_avg_survival_fraction_work(avg, latest); | |
741 } | |
742 | |
743 // The ratio of gc time to elapsed time, computed over recent pauses. | |
744 double _recent_avg_pause_time_ratio; | |
745 | |
746 double recent_avg_pause_time_ratio() { | |
747 return _recent_avg_pause_time_ratio; | |
748 } | |
749 | |
750 // Number of pauses between concurrent marking. | |
751 size_t _pauses_btwn_concurrent_mark; | |
752 | |
753 size_t _n_marks_since_last_pause; | |
754 | |
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755 // At the end of a pause we check the heap occupancy and we decide |
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756 // whether we will start a marking cycle during the next pause. If |
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757 // we decide that we want to do that, we will set this parameter to |
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758 // true. So, this parameter will stay true between the end of a |
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759 // pause and the beginning of a subsequent pause (not necessarily |
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760 // the next one, see the comments on the next field) when we decide |
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761 // that we will indeed start a marking cycle and do the initial-mark |
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762 // work. |
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763 volatile bool _initiate_conc_mark_if_possible; |
342 | 764 |
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765 // If initiate_conc_mark_if_possible() is set at the beginning of a |
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766 // pause, it is a suggestion that the pause should start a marking |
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767 // cycle by doing the initial-mark work. However, it is possible |
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768 // that the concurrent marking thread is still finishing up the |
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769 // previous marking cycle (e.g., clearing the next marking |
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770 // bitmap). If that is the case we cannot start a new cycle and |
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771 // we'll have to wait for the concurrent marking thread to finish |
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772 // what it is doing. In this case we will postpone the marking cycle |
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773 // initiation decision for the next pause. When we eventually decide |
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774 // to start a cycle, we will set _during_initial_mark_pause which |
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775 // will stay true until the end of the initial-mark pause and it's |
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776 // the condition that indicates that a pause is doing the |
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777 // initial-mark work. |
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778 volatile bool _during_initial_mark_pause; |
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779 |
342 | 780 bool _should_revert_to_full_young_gcs; |
781 bool _last_full_young_gc; | |
782 | |
783 // This set of variables tracks the collector efficiency, in order to | |
784 // determine whether we should initiate a new marking. | |
785 double _cur_mark_stop_world_time_ms; | |
786 double _mark_init_start_sec; | |
787 double _mark_remark_start_sec; | |
788 double _mark_cleanup_start_sec; | |
789 double _mark_closure_time_ms; | |
790 | |
791 void calculate_young_list_min_length(); | |
1394
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792 void calculate_young_list_target_length(); |
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793 void calculate_young_list_target_length(size_t rs_lengths); |
342 | 794 |
795 public: | |
796 | |
797 G1CollectorPolicy(); | |
798 | |
799 virtual G1CollectorPolicy* as_g1_policy() { return this; } | |
800 | |
801 virtual CollectorPolicy::Name kind() { | |
802 return CollectorPolicy::G1CollectorPolicyKind; | |
803 } | |
804 | |
805 void check_prediction_validity(); | |
806 | |
807 size_t bytes_in_collection_set() { | |
808 return _bytes_in_collection_set_before_gc; | |
809 } | |
810 | |
811 size_t bytes_in_to_space() { | |
812 return bytes_in_to_space_during_gc(); | |
813 } | |
814 | |
815 unsigned calc_gc_alloc_time_stamp() { | |
816 return _all_pause_times_ms->num() + 1; | |
817 } | |
818 | |
819 protected: | |
820 | |
821 // Count the number of bytes used in the CS. | |
822 void count_CS_bytes_used(); | |
823 | |
824 // Together these do the base cleanup-recording work. Subclasses might | |
825 // want to put something between them. | |
826 void record_concurrent_mark_cleanup_end_work1(size_t freed_bytes, | |
827 size_t max_live_bytes); | |
828 void record_concurrent_mark_cleanup_end_work2(); | |
829 | |
830 public: | |
831 | |
832 virtual void init(); | |
833 | |
545 | 834 // Create jstat counters for the policy. |
835 virtual void initialize_gc_policy_counters(); | |
836 | |
342 | 837 virtual HeapWord* mem_allocate_work(size_t size, |
838 bool is_tlab, | |
839 bool* gc_overhead_limit_was_exceeded); | |
840 | |
841 // This method controls how a collector handles one or more | |
842 // of its generations being fully allocated. | |
843 virtual HeapWord* satisfy_failed_allocation(size_t size, | |
844 bool is_tlab); | |
845 | |
846 BarrierSet::Name barrier_set_name() { return BarrierSet::G1SATBCTLogging; } | |
847 | |
848 GenRemSet::Name rem_set_name() { return GenRemSet::CardTable; } | |
849 | |
850 // The number of collection pauses so far. | |
851 long n_pauses() const { return _n_pauses; } | |
852 | |
853 // Update the heuristic info to record a collection pause of the given | |
854 // start time, where the given number of bytes were used at the start. | |
855 // This may involve changing the desired size of a collection set. | |
856 | |
857 virtual void record_stop_world_start(); | |
858 | |
859 virtual void record_collection_pause_start(double start_time_sec, | |
860 size_t start_used); | |
861 | |
862 // Must currently be called while the world is stopped. | |
863 virtual void record_concurrent_mark_init_start(); | |
864 virtual void record_concurrent_mark_init_end(); | |
865 void record_concurrent_mark_init_end_pre(double | |
866 mark_init_elapsed_time_ms); | |
867 | |
868 void record_mark_closure_time(double mark_closure_time_ms); | |
869 | |
870 virtual void record_concurrent_mark_remark_start(); | |
871 virtual void record_concurrent_mark_remark_end(); | |
872 | |
873 virtual void record_concurrent_mark_cleanup_start(); | |
874 virtual void record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
875 size_t max_live_bytes); | |
876 virtual void record_concurrent_mark_cleanup_completed(); | |
877 | |
878 virtual void record_concurrent_pause(); | |
879 virtual void record_concurrent_pause_end(); | |
880 | |
881 virtual void record_collection_pause_end_CH_strong_roots(); | |
882 virtual void record_collection_pause_end_G1_strong_roots(); | |
883 | |
1707 | 884 virtual void record_collection_pause_end(); |
342 | 885 |
886 // Record the fact that a full collection occurred. | |
887 virtual void record_full_collection_start(); | |
888 virtual void record_full_collection_end(); | |
889 | |
1611 | 890 void record_gc_worker_start_time(int worker_i, double ms) { |
891 _par_last_gc_worker_start_times_ms[worker_i] = ms; | |
892 } | |
893 | |
342 | 894 void record_ext_root_scan_time(int worker_i, double ms) { |
895 _par_last_ext_root_scan_times_ms[worker_i] = ms; | |
896 } | |
897 | |
898 void record_mark_stack_scan_time(int worker_i, double ms) { | |
899 _par_last_mark_stack_scan_times_ms[worker_i] = ms; | |
900 } | |
901 | |
902 void record_satb_drain_time(double ms) { | |
903 _cur_satb_drain_time_ms = ms; | |
904 _satb_drain_time_set = true; | |
905 } | |
906 | |
907 void record_satb_drain_processed_buffers (int processed_buffers) { | |
908 _last_satb_drain_processed_buffers = processed_buffers; | |
909 } | |
910 | |
911 void record_mod_union_time(double ms) { | |
912 _all_mod_union_times_ms->add(ms); | |
913 } | |
914 | |
915 void record_update_rs_time(int thread, double ms) { | |
916 _par_last_update_rs_times_ms[thread] = ms; | |
917 } | |
918 | |
919 void record_update_rs_processed_buffers (int thread, | |
920 double processed_buffers) { | |
921 _par_last_update_rs_processed_buffers[thread] = processed_buffers; | |
922 } | |
923 | |
924 void record_scan_rs_time(int thread, double ms) { | |
925 _par_last_scan_rs_times_ms[thread] = ms; | |
926 } | |
927 | |
928 void reset_obj_copy_time(int thread) { | |
929 _par_last_obj_copy_times_ms[thread] = 0.0; | |
930 } | |
931 | |
932 void reset_obj_copy_time() { | |
933 reset_obj_copy_time(0); | |
934 } | |
935 | |
936 void record_obj_copy_time(int thread, double ms) { | |
937 _par_last_obj_copy_times_ms[thread] += ms; | |
938 } | |
939 | |
1611 | 940 void record_termination(int thread, double ms, size_t attempts) { |
941 _par_last_termination_times_ms[thread] = ms; | |
942 _par_last_termination_attempts[thread] = (double) attempts; | |
342 | 943 } |
944 | |
1611 | 945 void record_gc_worker_end_time(int worker_i, double ms) { |
946 _par_last_gc_worker_end_times_ms[worker_i] = ms; | |
342 | 947 } |
948 | |
595
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949 void record_pause_time_ms(double ms) { |
342 | 950 _last_pause_time_ms = ms; |
951 } | |
952 | |
953 void record_clear_ct_time(double ms) { | |
954 _cur_clear_ct_time_ms = ms; | |
955 } | |
956 | |
957 void record_par_time(double ms) { | |
958 _cur_collection_par_time_ms = ms; | |
959 } | |
960 | |
961 void record_aux_start_time(int i) { | |
962 guarantee(i < _aux_num, "should be within range"); | |
963 _cur_aux_start_times_ms[i] = os::elapsedTime() * 1000.0; | |
964 } | |
965 | |
966 void record_aux_end_time(int i) { | |
967 guarantee(i < _aux_num, "should be within range"); | |
968 double ms = os::elapsedTime() * 1000.0 - _cur_aux_start_times_ms[i]; | |
969 _cur_aux_times_set[i] = true; | |
970 _cur_aux_times_ms[i] += ms; | |
971 } | |
972 | |
890
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973 #ifndef PRODUCT |
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974 void record_cc_clear_time(double ms) { |
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975 if (_min_clear_cc_time_ms < 0.0 || ms <= _min_clear_cc_time_ms) |
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976 _min_clear_cc_time_ms = ms; |
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977 if (_max_clear_cc_time_ms < 0.0 || ms >= _max_clear_cc_time_ms) |
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978 _max_clear_cc_time_ms = ms; |
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979 _cur_clear_cc_time_ms = ms; |
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980 _cum_clear_cc_time_ms += ms; |
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981 _num_cc_clears++; |
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982 } |
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983 #endif |
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984 |
342 | 985 // Record the fact that "bytes" bytes allocated in a region. |
986 void record_before_bytes(size_t bytes); | |
987 void record_after_bytes(size_t bytes); | |
988 | |
989 // Returns "true" if this is a good time to do a collection pause. | |
990 // The "word_size" argument, if non-zero, indicates the size of an | |
991 // allocation request that is prompting this query. | |
992 virtual bool should_do_collection_pause(size_t word_size) = 0; | |
993 | |
994 // Choose a new collection set. Marks the chosen regions as being | |
995 // "in_collection_set", and links them together. The head and number of | |
996 // the collection set are available via access methods. | |
1707 | 997 virtual void choose_collection_set(double target_pause_time_ms) = 0; |
342 | 998 |
999 // The head of the list (via "next_in_collection_set()") representing the | |
1000 // current collection set. | |
1001 HeapRegion* collection_set() { return _collection_set; } | |
1002 | |
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1003 void clear_collection_set() { _collection_set = NULL; } |
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1004 |
342 | 1005 // The number of elements in the current collection set. |
1006 size_t collection_set_size() { return _collection_set_size; } | |
1007 | |
1008 // Add "hr" to the CS. | |
1009 void add_to_collection_set(HeapRegion* hr); | |
1010 | |
1394
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1011 // Incremental CSet Support |
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1012 |
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1013 // The head of the incrementally built collection set. |
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1014 HeapRegion* inc_cset_head() { return _inc_cset_head; } |
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1015 |
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1016 // The tail of the incrementally built collection set. |
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1017 HeapRegion* inc_set_tail() { return _inc_cset_tail; } |
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1018 |
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1019 // The number of elements in the incrementally built collection set. |
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1020 size_t inc_cset_size() { return _inc_cset_size; } |
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1021 |
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1022 // Initialize incremental collection set info. |
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1023 void start_incremental_cset_building(); |
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1024 |
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1025 void clear_incremental_cset() { |
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1026 _inc_cset_head = NULL; |
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1027 _inc_cset_tail = NULL; |
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1028 } |
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1029 |
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1030 // Stop adding regions to the incremental collection set |
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1031 void stop_incremental_cset_building() { _inc_cset_build_state = Inactive; } |
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1032 |
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1033 // Add/remove information about hr to the aggregated information |
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1034 // for the incrementally built collection set. |
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1035 void add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length); |
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1036 void remove_from_incremental_cset_info(HeapRegion* hr); |
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1037 |
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1038 // Update information about hr in the aggregated information for |
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1039 // the incrementally built collection set. |
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1040 void update_incremental_cset_info(HeapRegion* hr, size_t new_rs_length); |
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1041 |
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1042 private: |
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1043 // Update the incremental cset information when adding a region |
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1044 // (should not be called directly). |
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1045 void add_region_to_incremental_cset_common(HeapRegion* hr); |
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1046 |
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1047 public: |
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1048 // Add hr to the LHS of the incremental collection set. |
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1049 void add_region_to_incremental_cset_lhs(HeapRegion* hr); |
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1050 |
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1051 // Add hr to the RHS of the incremental collection set. |
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1052 void add_region_to_incremental_cset_rhs(HeapRegion* hr); |
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1053 |
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1054 #ifndef PRODUCT |
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1055 void print_collection_set(HeapRegion* list_head, outputStream* st); |
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1056 #endif // !PRODUCT |
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1057 |
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1058 bool initiate_conc_mark_if_possible() { return _initiate_conc_mark_if_possible; } |
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1059 void set_initiate_conc_mark_if_possible() { _initiate_conc_mark_if_possible = true; } |
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1060 void clear_initiate_conc_mark_if_possible() { _initiate_conc_mark_if_possible = false; } |
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1061 |
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1062 bool during_initial_mark_pause() { return _during_initial_mark_pause; } |
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1063 void set_during_initial_mark_pause() { _during_initial_mark_pause = true; } |
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1064 void clear_during_initial_mark_pause(){ _during_initial_mark_pause = false; } |
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1065 |
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1066 // This sets the initiate_conc_mark_if_possible() flag to start a |
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1067 // new cycle, as long as we are not already in one. It's best if it |
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1068 // is called during a safepoint when the test whether a cycle is in |
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1069 // progress or not is stable. |
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1070 bool force_initial_mark_if_outside_cycle(); |
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1071 |
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1072 // This is called at the very beginning of an evacuation pause (it |
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1073 // has to be the first thing that the pause does). If |
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1074 // initiate_conc_mark_if_possible() is true, and the concurrent |
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1075 // marking thread has completed its work during the previous cycle, |
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1076 // it will set during_initial_mark_pause() to so that the pause does |
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1077 // the initial-mark work and start a marking cycle. |
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1078 void decide_on_conc_mark_initiation(); |
342 | 1079 |
1080 // If an expansion would be appropriate, because recent GC overhead had | |
1081 // exceeded the desired limit, return an amount to expand by. | |
1082 virtual size_t expansion_amount(); | |
1083 | |
1084 // note start of mark thread | |
1085 void note_start_of_mark_thread(); | |
1086 | |
1087 // The marked bytes of the "r" has changed; reclassify it's desirability | |
1088 // for marking. Also asserts that "r" is eligible for a CS. | |
1089 virtual void note_change_in_marked_bytes(HeapRegion* r) = 0; | |
1090 | |
1091 #ifndef PRODUCT | |
1092 // Check any appropriate marked bytes info, asserting false if | |
1093 // something's wrong, else returning "true". | |
1094 virtual bool assertMarkedBytesDataOK() = 0; | |
1095 #endif | |
1096 | |
1097 // Print tracing information. | |
1098 void print_tracing_info() const; | |
1099 | |
1100 // Print stats on young survival ratio | |
1101 void print_yg_surv_rate_info() const; | |
1102 | |
545 | 1103 void finished_recalculating_age_indexes(bool is_survivors) { |
1104 if (is_survivors) { | |
1105 _survivor_surv_rate_group->finished_recalculating_age_indexes(); | |
1106 } else { | |
1107 _short_lived_surv_rate_group->finished_recalculating_age_indexes(); | |
1108 } | |
342 | 1109 // do that for any other surv rate groups |
1110 } | |
1111 | |
1112 bool should_add_next_region_to_young_list(); | |
1113 | |
1114 bool in_young_gc_mode() { | |
1115 return _in_young_gc_mode; | |
1116 } | |
1117 void set_in_young_gc_mode(bool in_young_gc_mode) { | |
1118 _in_young_gc_mode = in_young_gc_mode; | |
1119 } | |
1120 | |
1121 bool full_young_gcs() { | |
1122 return _full_young_gcs; | |
1123 } | |
1124 void set_full_young_gcs(bool full_young_gcs) { | |
1125 _full_young_gcs = full_young_gcs; | |
1126 } | |
1127 | |
1128 bool adaptive_young_list_length() { | |
1129 return _adaptive_young_list_length; | |
1130 } | |
1131 void set_adaptive_young_list_length(bool adaptive_young_list_length) { | |
1132 _adaptive_young_list_length = adaptive_young_list_length; | |
1133 } | |
1134 | |
1135 inline double get_gc_eff_factor() { | |
1136 double ratio = _known_garbage_ratio; | |
1137 | |
1138 double square = ratio * ratio; | |
1139 // square = square * square; | |
1140 double ret = square * 9.0 + 1.0; | |
1141 #if 0 | |
1142 gclog_or_tty->print_cr("ratio = %1.2lf, ret = %1.2lf", ratio, ret); | |
1143 #endif // 0 | |
1144 guarantee(0.0 <= ret && ret < 10.0, "invariant!"); | |
1145 return ret; | |
1146 } | |
1147 | |
1148 // | |
1149 // Survivor regions policy. | |
1150 // | |
1151 protected: | |
1152 | |
1153 // Current tenuring threshold, set to 0 if the collector reaches the | |
1154 // maximum amount of suvivors regions. | |
1155 int _tenuring_threshold; | |
1156 | |
545 | 1157 // The limit on the number of regions allocated for survivors. |
1158 size_t _max_survivor_regions; | |
1159 | |
1160 // The amount of survor regions after a collection. | |
1161 size_t _recorded_survivor_regions; | |
1162 // List of survivor regions. | |
1163 HeapRegion* _recorded_survivor_head; | |
1164 HeapRegion* _recorded_survivor_tail; | |
1165 | |
1166 ageTable _survivors_age_table; | |
1167 | |
342 | 1168 public: |
1169 | |
1170 inline GCAllocPurpose | |
1171 evacuation_destination(HeapRegion* src_region, int age, size_t word_sz) { | |
1172 if (age < _tenuring_threshold && src_region->is_young()) { | |
1173 return GCAllocForSurvived; | |
1174 } else { | |
1175 return GCAllocForTenured; | |
1176 } | |
1177 } | |
1178 | |
1179 inline bool track_object_age(GCAllocPurpose purpose) { | |
1180 return purpose == GCAllocForSurvived; | |
1181 } | |
1182 | |
1183 inline GCAllocPurpose alternative_purpose(int purpose) { | |
1184 return GCAllocForTenured; | |
1185 } | |
1186 | |
545 | 1187 static const size_t REGIONS_UNLIMITED = ~(size_t)0; |
1188 | |
1189 size_t max_regions(int purpose); | |
342 | 1190 |
1191 // The limit on regions for a particular purpose is reached. | |
1192 void note_alloc_region_limit_reached(int purpose) { | |
1193 if (purpose == GCAllocForSurvived) { | |
1194 _tenuring_threshold = 0; | |
1195 } | |
1196 } | |
1197 | |
1198 void note_start_adding_survivor_regions() { | |
1199 _survivor_surv_rate_group->start_adding_regions(); | |
1200 } | |
1201 | |
1202 void note_stop_adding_survivor_regions() { | |
1203 _survivor_surv_rate_group->stop_adding_regions(); | |
1204 } | |
545 | 1205 |
1206 void record_survivor_regions(size_t regions, | |
1207 HeapRegion* head, | |
1208 HeapRegion* tail) { | |
1209 _recorded_survivor_regions = regions; | |
1210 _recorded_survivor_head = head; | |
1211 _recorded_survivor_tail = tail; | |
1212 } | |
1213 | |
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1214 size_t recorded_survivor_regions() { |
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1215 return _recorded_survivor_regions; |
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1216 } |
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1217 |
545 | 1218 void record_thread_age_table(ageTable* age_table) |
1219 { | |
1220 _survivors_age_table.merge_par(age_table); | |
1221 } | |
1222 | |
1223 // Calculates survivor space parameters. | |
1224 void calculate_survivors_policy(); | |
1225 | |
342 | 1226 }; |
1227 | |
1228 // This encapsulates a particular strategy for a g1 Collector. | |
1229 // | |
1230 // Start a concurrent mark when our heap size is n bytes | |
1231 // greater then our heap size was at the last concurrent | |
1232 // mark. Where n is a function of the CMSTriggerRatio | |
1233 // and the MinHeapFreeRatio. | |
1234 // | |
1235 // Start a g1 collection pause when we have allocated the | |
1236 // average number of bytes currently being freed in | |
1237 // a collection, but only if it is at least one region | |
1238 // full | |
1239 // | |
1240 // Resize Heap based on desired | |
1241 // allocation space, where desired allocation space is | |
1242 // a function of survival rate and desired future to size. | |
1243 // | |
1244 // Choose collection set by first picking all older regions | |
1245 // which have a survival rate which beats our projected young | |
1246 // survival rate. Then fill out the number of needed regions | |
1247 // with young regions. | |
1248 | |
1249 class G1CollectorPolicy_BestRegionsFirst: public G1CollectorPolicy { | |
1250 CollectionSetChooser* _collectionSetChooser; | |
1251 // If the estimated is less then desirable, resize if possible. | |
1252 void expand_if_possible(size_t numRegions); | |
1253 | |
1707 | 1254 virtual void choose_collection_set(double target_pause_time_ms); |
342 | 1255 virtual void record_collection_pause_start(double start_time_sec, |
1256 size_t start_used); | |
1257 virtual void record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
1258 size_t max_live_bytes); | |
1259 virtual void record_full_collection_end(); | |
1260 | |
1261 public: | |
1262 G1CollectorPolicy_BestRegionsFirst() { | |
1263 _collectionSetChooser = new CollectionSetChooser(); | |
1264 } | |
1707 | 1265 void record_collection_pause_end(); |
342 | 1266 bool should_do_collection_pause(size_t word_size); |
1267 // This is not needed any more, after the CSet choosing code was | |
1268 // changed to use the pause prediction work. But let's leave the | |
1269 // hook in just in case. | |
1270 void note_change_in_marked_bytes(HeapRegion* r) { } | |
1271 #ifndef PRODUCT | |
1272 bool assertMarkedBytesDataOK(); | |
1273 #endif | |
1274 }; | |
1275 | |
1276 // This should move to some place more general... | |
1277 | |
1278 // If we have "n" measurements, and we've kept track of their "sum" and the | |
1279 // "sum_of_squares" of the measurements, this returns the variance of the | |
1280 // sequence. | |
1281 inline double variance(int n, double sum_of_squares, double sum) { | |
1282 double n_d = (double)n; | |
1283 double avg = sum/n_d; | |
1284 return (sum_of_squares - 2.0 * avg * sum + n_d * avg * avg) / n_d; | |
1285 } | |
1286 | |
1287 // Local Variables: *** | |
1288 // c-indentation-style: gnu *** | |
1289 // End: *** |