Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.hpp @ 3980:8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
Summary: Fixed a few inconsistencies in the monitoring data, in particular when reported from jstat.
Reviewed-by: jmasa, brutisso, johnc
author | tonyp |
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date | Fri, 23 Sep 2011 16:07:49 -0400 |
parents | 4dfb2df418f2 |
children | 074f0252cc13 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTORPOLICY_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTORPOLICY_HPP | |
27 | |
28 #include "gc_implementation/g1/collectionSetChooser.hpp" | |
29 #include "gc_implementation/g1/g1MMUTracker.hpp" | |
30 #include "memory/collectorPolicy.hpp" | |
31 | |
342 | 32 // A G1CollectorPolicy makes policy decisions that determine the |
33 // characteristics of the collector. Examples include: | |
34 // * choice of collection set. | |
35 // * when to collect. | |
36 | |
37 class HeapRegion; | |
38 class CollectionSetChooser; | |
39 | |
40 // Yes, this is a bit unpleasant... but it saves replicating the same thing | |
41 // over and over again and introducing subtle problems through small typos and | |
42 // cutting and pasting mistakes. The macros below introduces a number | |
43 // sequnce into the following two classes and the methods that access it. | |
44 | |
45 #define define_num_seq(name) \ | |
46 private: \ | |
47 NumberSeq _all_##name##_times_ms; \ | |
48 public: \ | |
49 void record_##name##_time_ms(double ms) { \ | |
50 _all_##name##_times_ms.add(ms); \ | |
51 } \ | |
52 NumberSeq* get_##name##_seq() { \ | |
53 return &_all_##name##_times_ms; \ | |
54 } | |
55 | |
56 class MainBodySummary; | |
57 | |
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58 class PauseSummary: public CHeapObj { |
342 | 59 define_num_seq(total) |
60 define_num_seq(other) | |
61 | |
62 public: | |
63 virtual MainBodySummary* main_body_summary() { return NULL; } | |
64 }; | |
65 | |
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66 class MainBodySummary: public CHeapObj { |
342 | 67 define_num_seq(satb_drain) // optional |
68 define_num_seq(parallel) // parallel only | |
69 define_num_seq(ext_root_scan) | |
70 define_num_seq(mark_stack_scan) | |
71 define_num_seq(update_rs) | |
72 define_num_seq(scan_rs) | |
73 define_num_seq(obj_copy) | |
74 define_num_seq(termination) // parallel only | |
75 define_num_seq(parallel_other) // parallel only | |
76 define_num_seq(mark_closure) | |
77 define_num_seq(clear_ct) // parallel only | |
78 }; | |
79 | |
677 | 80 class Summary: public PauseSummary, |
81 public MainBodySummary { | |
342 | 82 public: |
83 virtual MainBodySummary* main_body_summary() { return this; } | |
84 }; | |
85 | |
86 class G1CollectorPolicy: public CollectorPolicy { | |
87 protected: | |
88 // The number of pauses during the execution. | |
89 long _n_pauses; | |
90 | |
91 // either equal to the number of parallel threads, if ParallelGCThreads | |
92 // has been set, or 1 otherwise | |
93 int _parallel_gc_threads; | |
94 | |
95 enum SomePrivateConstants { | |
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96 NumPrevPausesForHeuristics = 10 |
342 | 97 }; |
98 | |
99 G1MMUTracker* _mmu_tracker; | |
100 | |
101 void initialize_flags(); | |
102 | |
103 void initialize_all() { | |
104 initialize_flags(); | |
105 initialize_size_info(); | |
106 initialize_perm_generation(PermGen::MarkSweepCompact); | |
107 } | |
108 | |
109 virtual size_t default_init_heap_size() { | |
110 // Pick some reasonable default. | |
111 return 8*M; | |
112 } | |
113 | |
114 double _cur_collection_start_sec; | |
115 size_t _cur_collection_pause_used_at_start_bytes; | |
116 size_t _cur_collection_pause_used_regions_at_start; | |
117 size_t _prev_collection_pause_used_at_end_bytes; | |
118 double _cur_collection_par_time_ms; | |
119 double _cur_satb_drain_time_ms; | |
120 double _cur_clear_ct_time_ms; | |
121 bool _satb_drain_time_set; | |
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122 double _cur_ref_proc_time_ms; |
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123 double _cur_ref_enq_time_ms; |
342 | 124 |
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125 #ifndef PRODUCT |
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126 // Card Table Count Cache stats |
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127 double _min_clear_cc_time_ms; // min |
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128 double _max_clear_cc_time_ms; // max |
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129 double _cur_clear_cc_time_ms; // clearing time during current pause |
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130 double _cum_clear_cc_time_ms; // cummulative clearing time |
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131 jlong _num_cc_clears; // number of times the card count cache has been cleared |
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132 #endif |
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133 |
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134 // Statistics for recent GC pauses. See below for how indexed. |
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135 TruncatedSeq* _recent_rs_scan_times_ms; |
342 | 136 |
137 // These exclude marking times. | |
138 TruncatedSeq* _recent_pause_times_ms; | |
139 TruncatedSeq* _recent_gc_times_ms; | |
140 | |
141 TruncatedSeq* _recent_CS_bytes_used_before; | |
142 TruncatedSeq* _recent_CS_bytes_surviving; | |
143 | |
144 TruncatedSeq* _recent_rs_sizes; | |
145 | |
146 TruncatedSeq* _concurrent_mark_remark_times_ms; | |
147 TruncatedSeq* _concurrent_mark_cleanup_times_ms; | |
148 | |
677 | 149 Summary* _summary; |
342 | 150 |
151 NumberSeq* _all_pause_times_ms; | |
152 NumberSeq* _all_full_gc_times_ms; | |
153 double _stop_world_start; | |
154 NumberSeq* _all_stop_world_times_ms; | |
155 NumberSeq* _all_yield_times_ms; | |
156 | |
157 size_t _region_num_young; | |
158 size_t _region_num_tenured; | |
159 size_t _prev_region_num_young; | |
160 size_t _prev_region_num_tenured; | |
161 | |
162 NumberSeq* _all_mod_union_times_ms; | |
163 | |
164 int _aux_num; | |
165 NumberSeq* _all_aux_times_ms; | |
166 double* _cur_aux_start_times_ms; | |
167 double* _cur_aux_times_ms; | |
168 bool* _cur_aux_times_set; | |
169 | |
1611 | 170 double* _par_last_gc_worker_start_times_ms; |
342 | 171 double* _par_last_ext_root_scan_times_ms; |
172 double* _par_last_mark_stack_scan_times_ms; | |
173 double* _par_last_update_rs_times_ms; | |
174 double* _par_last_update_rs_processed_buffers; | |
175 double* _par_last_scan_rs_times_ms; | |
176 double* _par_last_obj_copy_times_ms; | |
177 double* _par_last_termination_times_ms; | |
1611 | 178 double* _par_last_termination_attempts; |
179 double* _par_last_gc_worker_end_times_ms; | |
2430 | 180 double* _par_last_gc_worker_times_ms; |
342 | 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_target_length; | |
189 size_t _young_list_fixed_length; | |
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190 size_t _prev_eden_capacity; // used for logging |
342 | 191 |
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192 // The max number of regions we can extend the eden by while the GC |
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193 // locker is active. This should be >= _young_list_target_length; |
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194 size_t _young_list_max_length; |
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195 |
342 | 196 size_t _young_cset_length; |
197 bool _last_young_gc_full; | |
198 | |
199 unsigned _full_young_pause_num; | |
200 unsigned _partial_young_pause_num; | |
201 | |
202 bool _during_marking; | |
203 bool _in_marking_window; | |
204 bool _in_marking_window_im; | |
205 | |
206 SurvRateGroup* _short_lived_surv_rate_group; | |
207 SurvRateGroup* _survivor_surv_rate_group; | |
208 // add here any more surv rate groups | |
209 | |
1356 | 210 double _gc_overhead_perc; |
211 | |
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212 double _reserve_factor; |
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213 size_t _reserve_regions; |
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214 |
342 | 215 bool during_marking() { |
216 return _during_marking; | |
217 } | |
218 | |
219 // <NEW PREDICTION> | |
220 | |
221 private: | |
222 enum PredictionConstants { | |
223 TruncatedSeqLength = 10 | |
224 }; | |
225 | |
226 TruncatedSeq* _alloc_rate_ms_seq; | |
227 double _prev_collection_pause_end_ms; | |
228 | |
229 TruncatedSeq* _pending_card_diff_seq; | |
230 TruncatedSeq* _rs_length_diff_seq; | |
231 TruncatedSeq* _cost_per_card_ms_seq; | |
232 TruncatedSeq* _fully_young_cards_per_entry_ratio_seq; | |
233 TruncatedSeq* _partially_young_cards_per_entry_ratio_seq; | |
234 TruncatedSeq* _cost_per_entry_ms_seq; | |
235 TruncatedSeq* _partially_young_cost_per_entry_ms_seq; | |
236 TruncatedSeq* _cost_per_byte_ms_seq; | |
237 TruncatedSeq* _constant_other_time_ms_seq; | |
238 TruncatedSeq* _young_other_cost_per_region_ms_seq; | |
239 TruncatedSeq* _non_young_other_cost_per_region_ms_seq; | |
240 | |
241 TruncatedSeq* _pending_cards_seq; | |
242 TruncatedSeq* _scanned_cards_seq; | |
243 TruncatedSeq* _rs_lengths_seq; | |
244 | |
245 TruncatedSeq* _cost_per_byte_ms_during_cm_seq; | |
246 | |
247 TruncatedSeq* _young_gc_eff_seq; | |
248 | |
249 TruncatedSeq* _max_conc_overhead_seq; | |
250 | |
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251 bool _using_new_ratio_calculations; |
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252 size_t _min_desired_young_length; // as set on the command line or default calculations |
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253 size_t _max_desired_young_length; // as set on the command line or default calculations |
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254 |
342 | 255 size_t _recorded_young_regions; |
256 size_t _recorded_non_young_regions; | |
257 size_t _recorded_region_num; | |
258 | |
259 size_t _free_regions_at_end_of_collection; | |
260 | |
261 size_t _recorded_rs_lengths; | |
262 size_t _max_rs_lengths; | |
263 | |
264 size_t _recorded_marked_bytes; | |
265 size_t _recorded_young_bytes; | |
266 | |
267 size_t _predicted_pending_cards; | |
268 size_t _predicted_cards_scanned; | |
269 size_t _predicted_rs_lengths; | |
270 size_t _predicted_bytes_to_copy; | |
271 | |
272 double _predicted_survival_ratio; | |
273 double _predicted_rs_update_time_ms; | |
274 double _predicted_rs_scan_time_ms; | |
275 double _predicted_object_copy_time_ms; | |
276 double _predicted_constant_other_time_ms; | |
277 double _predicted_young_other_time_ms; | |
278 double _predicted_non_young_other_time_ms; | |
279 double _predicted_pause_time_ms; | |
280 | |
281 double _vtime_diff_ms; | |
282 | |
283 double _recorded_young_free_cset_time_ms; | |
284 double _recorded_non_young_free_cset_time_ms; | |
285 | |
286 double _sigma; | |
287 double _expensive_region_limit_ms; | |
288 | |
289 size_t _rs_lengths_prediction; | |
290 | |
291 size_t _known_garbage_bytes; | |
292 double _known_garbage_ratio; | |
293 | |
294 double sigma() { | |
295 return _sigma; | |
296 } | |
297 | |
298 // A function that prevents us putting too much stock in small sample | |
299 // sets. Returns a number between 2.0 and 1.0, depending on the number | |
300 // of samples. 5 or more samples yields one; fewer scales linearly from | |
301 // 2.0 at 1 sample to 1.0 at 5. | |
302 double confidence_factor(int samples) { | |
303 if (samples > 4) return 1.0; | |
304 else return 1.0 + sigma() * ((double)(5 - samples))/2.0; | |
305 } | |
306 | |
307 double get_new_neg_prediction(TruncatedSeq* seq) { | |
308 return seq->davg() - sigma() * seq->dsd(); | |
309 } | |
310 | |
311 #ifndef PRODUCT | |
312 bool verify_young_ages(HeapRegion* head, SurvRateGroup *surv_rate_group); | |
313 #endif // PRODUCT | |
314 | |
1111 | 315 void adjust_concurrent_refinement(double update_rs_time, |
316 double update_rs_processed_buffers, | |
317 double goal_ms); | |
318 | |
342 | 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 double get_new_prediction(TruncatedSeq* seq) { | |
342 return MAX2(seq->davg() + sigma() * seq->dsd(), | |
343 seq->davg() * confidence_factor(seq->num())); | |
344 } | |
345 | |
346 size_t young_cset_length() { | |
347 return _young_cset_length; | |
348 } | |
349 | |
350 void record_max_rs_lengths(size_t rs_lengths) { | |
351 _max_rs_lengths = rs_lengths; | |
352 } | |
353 | |
354 size_t predict_pending_card_diff() { | |
355 double prediction = get_new_neg_prediction(_pending_card_diff_seq); | |
356 if (prediction < 0.00001) | |
357 return 0; | |
358 else | |
359 return (size_t) prediction; | |
360 } | |
361 | |
362 size_t predict_pending_cards() { | |
363 size_t max_pending_card_num = _g1->max_pending_card_num(); | |
364 size_t diff = predict_pending_card_diff(); | |
365 size_t prediction; | |
366 if (diff > max_pending_card_num) | |
367 prediction = max_pending_card_num; | |
368 else | |
369 prediction = max_pending_card_num - diff; | |
370 | |
371 return prediction; | |
372 } | |
373 | |
374 size_t predict_rs_length_diff() { | |
375 return (size_t) get_new_prediction(_rs_length_diff_seq); | |
376 } | |
377 | |
378 double predict_alloc_rate_ms() { | |
379 return get_new_prediction(_alloc_rate_ms_seq); | |
380 } | |
381 | |
382 double predict_cost_per_card_ms() { | |
383 return get_new_prediction(_cost_per_card_ms_seq); | |
384 } | |
385 | |
386 double predict_rs_update_time_ms(size_t pending_cards) { | |
387 return (double) pending_cards * predict_cost_per_card_ms(); | |
388 } | |
389 | |
390 double predict_fully_young_cards_per_entry_ratio() { | |
391 return get_new_prediction(_fully_young_cards_per_entry_ratio_seq); | |
392 } | |
393 | |
394 double predict_partially_young_cards_per_entry_ratio() { | |
395 if (_partially_young_cards_per_entry_ratio_seq->num() < 2) | |
396 return predict_fully_young_cards_per_entry_ratio(); | |
397 else | |
398 return get_new_prediction(_partially_young_cards_per_entry_ratio_seq); | |
399 } | |
400 | |
401 size_t predict_young_card_num(size_t rs_length) { | |
402 return (size_t) ((double) rs_length * | |
403 predict_fully_young_cards_per_entry_ratio()); | |
404 } | |
405 | |
406 size_t predict_non_young_card_num(size_t rs_length) { | |
407 return (size_t) ((double) rs_length * | |
408 predict_partially_young_cards_per_entry_ratio()); | |
409 } | |
410 | |
411 double predict_rs_scan_time_ms(size_t card_num) { | |
412 if (full_young_gcs()) | |
413 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); | |
414 else | |
415 return predict_partially_young_rs_scan_time_ms(card_num); | |
416 } | |
417 | |
418 double predict_partially_young_rs_scan_time_ms(size_t card_num) { | |
419 if (_partially_young_cost_per_entry_ms_seq->num() < 3) | |
420 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); | |
421 else | |
422 return (double) card_num * | |
423 get_new_prediction(_partially_young_cost_per_entry_ms_seq); | |
424 } | |
425 | |
426 double predict_object_copy_time_ms_during_cm(size_t bytes_to_copy) { | |
427 if (_cost_per_byte_ms_during_cm_seq->num() < 3) | |
428 return 1.1 * (double) bytes_to_copy * | |
429 get_new_prediction(_cost_per_byte_ms_seq); | |
430 else | |
431 return (double) bytes_to_copy * | |
432 get_new_prediction(_cost_per_byte_ms_during_cm_seq); | |
433 } | |
434 | |
435 double predict_object_copy_time_ms(size_t bytes_to_copy) { | |
436 if (_in_marking_window && !_in_marking_window_im) | |
437 return predict_object_copy_time_ms_during_cm(bytes_to_copy); | |
438 else | |
439 return (double) bytes_to_copy * | |
440 get_new_prediction(_cost_per_byte_ms_seq); | |
441 } | |
442 | |
443 double predict_constant_other_time_ms() { | |
444 return get_new_prediction(_constant_other_time_ms_seq); | |
445 } | |
446 | |
447 double predict_young_other_time_ms(size_t young_num) { | |
448 return | |
449 (double) young_num * | |
450 get_new_prediction(_young_other_cost_per_region_ms_seq); | |
451 } | |
452 | |
453 double predict_non_young_other_time_ms(size_t non_young_num) { | |
454 return | |
455 (double) non_young_num * | |
456 get_new_prediction(_non_young_other_cost_per_region_ms_seq); | |
457 } | |
458 | |
459 void check_if_region_is_too_expensive(double predicted_time_ms); | |
460 | |
461 double predict_young_collection_elapsed_time_ms(size_t adjustment); | |
462 double predict_base_elapsed_time_ms(size_t pending_cards); | |
463 double predict_base_elapsed_time_ms(size_t pending_cards, | |
464 size_t scanned_cards); | |
465 size_t predict_bytes_to_copy(HeapRegion* hr); | |
466 double predict_region_elapsed_time_ms(HeapRegion* hr, bool young); | |
467 | |
468 void start_recording_regions(); | |
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469 void record_cset_region_info(HeapRegion* hr, bool young); |
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470 void record_non_young_cset_region(HeapRegion* hr); |
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471 |
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472 void set_recorded_young_regions(size_t n_regions); |
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473 void set_recorded_young_bytes(size_t bytes); |
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474 void set_recorded_rs_lengths(size_t rs_lengths); |
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475 void set_predicted_bytes_to_copy(size_t bytes); |
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476 |
342 | 477 void end_recording_regions(); |
478 | |
479 void record_vtime_diff_ms(double vtime_diff_ms) { | |
480 _vtime_diff_ms = vtime_diff_ms; | |
481 } | |
482 | |
483 void record_young_free_cset_time_ms(double time_ms) { | |
484 _recorded_young_free_cset_time_ms = time_ms; | |
485 } | |
486 | |
487 void record_non_young_free_cset_time_ms(double time_ms) { | |
488 _recorded_non_young_free_cset_time_ms = time_ms; | |
489 } | |
490 | |
491 double predict_young_gc_eff() { | |
492 return get_new_neg_prediction(_young_gc_eff_seq); | |
493 } | |
494 | |
545 | 495 double predict_survivor_regions_evac_time(); |
496 | |
342 | 497 // </NEW PREDICTION> |
498 | |
499 void cset_regions_freed() { | |
500 bool propagate = _last_young_gc_full && !_in_marking_window; | |
501 _short_lived_surv_rate_group->all_surviving_words_recorded(propagate); | |
502 _survivor_surv_rate_group->all_surviving_words_recorded(propagate); | |
503 // also call it on any more surv rate groups | |
504 } | |
505 | |
506 void set_known_garbage_bytes(size_t known_garbage_bytes) { | |
507 _known_garbage_bytes = known_garbage_bytes; | |
508 size_t heap_bytes = _g1->capacity(); | |
509 _known_garbage_ratio = (double) _known_garbage_bytes / (double) heap_bytes; | |
510 } | |
511 | |
512 void decrease_known_garbage_bytes(size_t known_garbage_bytes) { | |
513 guarantee( _known_garbage_bytes >= known_garbage_bytes, "invariant" ); | |
514 | |
515 _known_garbage_bytes -= known_garbage_bytes; | |
516 size_t heap_bytes = _g1->capacity(); | |
517 _known_garbage_ratio = (double) _known_garbage_bytes / (double) heap_bytes; | |
518 } | |
519 | |
520 G1MMUTracker* mmu_tracker() { | |
521 return _mmu_tracker; | |
522 } | |
523 | |
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524 double max_pause_time_ms() { |
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525 return _mmu_tracker->max_gc_time() * 1000.0; |
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526 } |
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527 |
342 | 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 | |
2430 | 561 void print_par_stats(int level, const char* str, double* data); |
562 void print_par_sizes(int level, const char* str, double* data); | |
342 | 563 |
564 void check_other_times(int level, | |
565 NumberSeq* other_times_ms, | |
566 NumberSeq* calc_other_times_ms) const; | |
567 | |
568 void print_summary (PauseSummary* stats) const; | |
569 | |
570 void print_summary (int level, const char* str, NumberSeq* seq) const; | |
571 void print_summary_sd (int level, const char* str, NumberSeq* seq) const; | |
572 | |
573 double avg_value (double* data); | |
574 double max_value (double* data); | |
575 double sum_of_values (double* data); | |
576 double max_sum (double* data1, double* data2); | |
577 | |
578 int _last_satb_drain_processed_buffers; | |
579 int _last_update_rs_processed_buffers; | |
580 double _last_pause_time_ms; | |
581 | |
582 size_t _bytes_in_collection_set_before_gc; | |
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583 size_t _bytes_copied_during_gc; |
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584 |
342 | 585 // Used to count used bytes in CS. |
586 friend class CountCSClosure; | |
587 | |
588 // Statistics kept per GC stoppage, pause or full. | |
589 TruncatedSeq* _recent_prev_end_times_for_all_gcs_sec; | |
590 | |
591 // We track markings. | |
592 int _num_markings; | |
593 double _mark_thread_startup_sec; // Time at startup of marking thread | |
594 | |
595 // Add a new GC of the given duration and end time to the record. | |
596 void update_recent_gc_times(double end_time_sec, double elapsed_ms); | |
597 | |
598 // The head of the list (via "next_in_collection_set()") representing the | |
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599 // current collection set. Set from the incrementally built collection |
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600 // set at the start of the pause. |
342 | 601 HeapRegion* _collection_set; |
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602 |
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603 // The number of regions in the collection set. Set from the incrementally |
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604 // built collection set at the start of an evacuation pause. |
342 | 605 size_t _collection_set_size; |
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606 |
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607 // The number of bytes in the collection set before the pause. Set from |
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608 // the incrementally built collection set at the start of an evacuation |
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609 // pause. |
342 | 610 size_t _collection_set_bytes_used_before; |
611 | |
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612 // The associated information that is maintained while the incremental |
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613 // collection set is being built with young regions. Used to populate |
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614 // the recorded info for the evacuation pause. |
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615 |
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616 enum CSetBuildType { |
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617 Active, // We are actively building the collection set |
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618 Inactive // We are not actively building the collection set |
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619 }; |
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620 |
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621 CSetBuildType _inc_cset_build_state; |
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622 |
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623 // The head of the incrementally built collection set. |
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624 HeapRegion* _inc_cset_head; |
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625 |
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626 // The tail of the incrementally built collection set. |
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627 HeapRegion* _inc_cset_tail; |
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628 |
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629 // The number of regions in the incrementally built collection set. |
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630 // Used to set _collection_set_size at the start of an evacuation |
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631 // pause. |
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632 size_t _inc_cset_size; |
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633 |
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634 // Used as the index in the surving young words structure |
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635 // which tracks the amount of space, for each young region, |
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636 // that survives the pause. |
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637 size_t _inc_cset_young_index; |
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638 |
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639 // The number of bytes in the incrementally built collection set. |
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640 // Used to set _collection_set_bytes_used_before at the start of |
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641 // an evacuation pause. |
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642 size_t _inc_cset_bytes_used_before; |
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643 |
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644 // Used to record the highest end of heap region in collection set |
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645 HeapWord* _inc_cset_max_finger; |
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646 |
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647 // The number of recorded used bytes in the young regions |
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648 // of the collection set. This is the sum of the used() bytes |
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649 // of retired young regions in the collection set. |
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650 size_t _inc_cset_recorded_young_bytes; |
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651 |
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652 // The RSet lengths recorded for regions in the collection set |
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653 // (updated by the periodic sampling of the regions in the |
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654 // young list/collection set). |
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655 size_t _inc_cset_recorded_rs_lengths; |
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656 |
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657 // The predicted elapsed time it will take to collect the regions |
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658 // in the collection set (updated by the periodic sampling of the |
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659 // regions in the young list/collection set). |
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660 double _inc_cset_predicted_elapsed_time_ms; |
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661 |
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662 // The predicted bytes to copy for the regions in the collection |
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663 // set (updated by the periodic sampling of the regions in the |
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664 // young list/collection set). |
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665 size_t _inc_cset_predicted_bytes_to_copy; |
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666 |
342 | 667 // Info about marking. |
668 int _n_marks; // Sticky at 2, so we know when we've done at least 2. | |
669 | |
670 // The number of collection pauses at the end of the last mark. | |
671 size_t _n_pauses_at_mark_end; | |
672 | |
673 // Stash a pointer to the g1 heap. | |
674 G1CollectedHeap* _g1; | |
675 | |
676 // The average time in ms per collection pause, averaged over recent pauses. | |
677 double recent_avg_time_for_pauses_ms(); | |
678 | |
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679 // The average time in ms for RS scanning, per pause, averaged |
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680 // over recent pauses. (Note the RS scanning time for a pause |
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681 // is itself an average of the RS scanning time for each worker |
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682 // thread.) |
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683 double recent_avg_time_for_rs_scan_ms(); |
342 | 684 |
685 // The number of "recent" GCs recorded in the number sequences | |
686 int number_of_recent_gcs(); | |
687 | |
688 // The average survival ratio, computed by the total number of bytes | |
689 // suriviving / total number of bytes before collection over the last | |
690 // several recent pauses. | |
691 double recent_avg_survival_fraction(); | |
692 // The survival fraction of the most recent pause; if there have been no | |
693 // pauses, returns 1.0. | |
694 double last_survival_fraction(); | |
695 | |
696 // Returns a "conservative" estimate of the recent survival rate, i.e., | |
697 // one that may be higher than "recent_avg_survival_fraction". | |
698 // This is conservative in several ways: | |
699 // If there have been few pauses, it will assume a potential high | |
700 // variance, and err on the side of caution. | |
701 // It puts a lower bound (currently 0.1) on the value it will return. | |
702 // To try to detect phase changes, if the most recent pause ("latest") has a | |
703 // higher-than average ("avg") survival rate, it returns that rate. | |
704 // "work" version is a utility function; young is restricted to young regions. | |
705 double conservative_avg_survival_fraction_work(double avg, | |
706 double latest); | |
707 | |
708 // The arguments are the two sequences that keep track of the number of bytes | |
709 // surviving and the total number of bytes before collection, resp., | |
710 // over the last evereal recent pauses | |
711 // Returns the survival rate for the category in the most recent pause. | |
712 // If there have been no pauses, returns 1.0. | |
713 double last_survival_fraction_work(TruncatedSeq* surviving, | |
714 TruncatedSeq* before); | |
715 | |
716 // The arguments are the two sequences that keep track of the number of bytes | |
717 // surviving and the total number of bytes before collection, resp., | |
718 // over the last several recent pauses | |
719 // Returns the average survival ration over the last several recent pauses | |
720 // If there have been no pauses, return 1.0 | |
721 double recent_avg_survival_fraction_work(TruncatedSeq* surviving, | |
722 TruncatedSeq* before); | |
723 | |
724 double conservative_avg_survival_fraction() { | |
725 double avg = recent_avg_survival_fraction(); | |
726 double latest = last_survival_fraction(); | |
727 return conservative_avg_survival_fraction_work(avg, latest); | |
728 } | |
729 | |
730 // The ratio of gc time to elapsed time, computed over recent pauses. | |
731 double _recent_avg_pause_time_ratio; | |
732 | |
733 double recent_avg_pause_time_ratio() { | |
734 return _recent_avg_pause_time_ratio; | |
735 } | |
736 | |
737 // Number of pauses between concurrent marking. | |
738 size_t _pauses_btwn_concurrent_mark; | |
739 | |
740 size_t _n_marks_since_last_pause; | |
741 | |
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742 // At the end of a pause we check the heap occupancy and we decide |
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743 // whether we will start a marking cycle during the next pause. If |
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744 // we decide that we want to do that, we will set this parameter to |
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745 // true. So, this parameter will stay true between the end of a |
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746 // pause and the beginning of a subsequent pause (not necessarily |
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747 // the next one, see the comments on the next field) when we decide |
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748 // that we will indeed start a marking cycle and do the initial-mark |
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749 // work. |
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750 volatile bool _initiate_conc_mark_if_possible; |
342 | 751 |
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752 // If initiate_conc_mark_if_possible() is set at the beginning of a |
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753 // pause, it is a suggestion that the pause should start a marking |
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754 // cycle by doing the initial-mark work. However, it is possible |
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755 // that the concurrent marking thread is still finishing up the |
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756 // previous marking cycle (e.g., clearing the next marking |
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757 // bitmap). If that is the case we cannot start a new cycle and |
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758 // we'll have to wait for the concurrent marking thread to finish |
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759 // what it is doing. In this case we will postpone the marking cycle |
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760 // initiation decision for the next pause. When we eventually decide |
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761 // to start a cycle, we will set _during_initial_mark_pause which |
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762 // will stay true until the end of the initial-mark pause and it's |
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763 // the condition that indicates that a pause is doing the |
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764 // initial-mark work. |
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765 volatile bool _during_initial_mark_pause; |
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766 |
342 | 767 bool _should_revert_to_full_young_gcs; |
768 bool _last_full_young_gc; | |
769 | |
770 // This set of variables tracks the collector efficiency, in order to | |
771 // determine whether we should initiate a new marking. | |
772 double _cur_mark_stop_world_time_ms; | |
773 double _mark_remark_start_sec; | |
774 double _mark_cleanup_start_sec; | |
775 double _mark_closure_time_ms; | |
776 | |
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777 // Update the young list target length either by setting it to the |
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778 // desired fixed value or by calculating it using G1's pause |
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779 // prediction model. If no rs_lengths parameter is passed, predict |
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780 // the RS lengths using the prediction model, otherwise use the |
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781 // given rs_lengths as the prediction. |
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782 void update_young_list_target_length(size_t rs_lengths = (size_t) -1); |
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783 |
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784 // Calculate and return the minimum desired young list target |
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785 // length. This is the minimum desired young list length according |
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786 // to the user's inputs. |
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787 size_t calculate_young_list_desired_min_length(size_t base_min_length); |
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788 |
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789 // Calculate and return the maximum desired young list target |
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790 // length. This is the maximum desired young list length according |
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791 // to the user's inputs. |
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792 size_t calculate_young_list_desired_max_length(); |
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793 |
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794 // Calculate and return the maximum young list target length that |
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795 // can fit into the pause time goal. The parameters are: rs_lengths |
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796 // represent the prediction of how large the young RSet lengths will |
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797 // be, base_min_length is the alreay existing number of regions in |
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798 // the young list, min_length and max_length are the desired min and |
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799 // max young list length according to the user's inputs. |
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800 size_t calculate_young_list_target_length(size_t rs_lengths, |
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801 size_t base_min_length, |
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802 size_t desired_min_length, |
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803 size_t desired_max_length); |
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804 |
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805 // Check whether a given young length (young_length) fits into the |
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806 // given target pause time and whether the prediction for the amount |
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807 // of objects to be copied for the given length will fit into the |
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808 // given free space (expressed by base_free_regions). It is used by |
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809 // calculate_young_list_target_length(). |
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810 bool predict_will_fit(size_t young_length, double base_time_ms, |
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811 size_t base_free_regions, double target_pause_time_ms); |
342 | 812 |
813 public: | |
814 | |
815 G1CollectorPolicy(); | |
816 | |
817 virtual G1CollectorPolicy* as_g1_policy() { return this; } | |
818 | |
819 virtual CollectorPolicy::Name kind() { | |
820 return CollectorPolicy::G1CollectorPolicyKind; | |
821 } | |
822 | |
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823 // Check the current value of the young list RSet lengths and |
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824 // compare it against the last prediction. If the current value is |
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825 // higher, recalculate the young list target length prediction. |
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826 void revise_young_list_target_length_if_necessary(); |
342 | 827 |
828 size_t bytes_in_collection_set() { | |
829 return _bytes_in_collection_set_before_gc; | |
830 } | |
831 | |
832 unsigned calc_gc_alloc_time_stamp() { | |
833 return _all_pause_times_ms->num() + 1; | |
834 } | |
835 | |
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836 // This should be called after the heap is resized. |
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837 void record_new_heap_size(size_t new_number_of_regions); |
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838 |
342 | 839 protected: |
840 | |
841 // Count the number of bytes used in the CS. | |
842 void count_CS_bytes_used(); | |
843 | |
844 // Together these do the base cleanup-recording work. Subclasses might | |
845 // want to put something between them. | |
846 void record_concurrent_mark_cleanup_end_work1(size_t freed_bytes, | |
847 size_t max_live_bytes); | |
848 void record_concurrent_mark_cleanup_end_work2(); | |
849 | |
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850 void update_young_list_size_using_newratio(size_t number_of_heap_regions); |
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851 |
342 | 852 public: |
853 | |
854 virtual void init(); | |
855 | |
545 | 856 // Create jstat counters for the policy. |
857 virtual void initialize_gc_policy_counters(); | |
858 | |
342 | 859 virtual HeapWord* mem_allocate_work(size_t size, |
860 bool is_tlab, | |
861 bool* gc_overhead_limit_was_exceeded); | |
862 | |
863 // This method controls how a collector handles one or more | |
864 // of its generations being fully allocated. | |
865 virtual HeapWord* satisfy_failed_allocation(size_t size, | |
866 bool is_tlab); | |
867 | |
868 BarrierSet::Name barrier_set_name() { return BarrierSet::G1SATBCTLogging; } | |
869 | |
870 GenRemSet::Name rem_set_name() { return GenRemSet::CardTable; } | |
871 | |
872 // The number of collection pauses so far. | |
873 long n_pauses() const { return _n_pauses; } | |
874 | |
875 // Update the heuristic info to record a collection pause of the given | |
876 // start time, where the given number of bytes were used at the start. | |
877 // This may involve changing the desired size of a collection set. | |
878 | |
879 virtual void record_stop_world_start(); | |
880 | |
881 virtual void record_collection_pause_start(double start_time_sec, | |
882 size_t start_used); | |
883 | |
884 // Must currently be called while the world is stopped. | |
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885 void record_concurrent_mark_init_end(double |
342 | 886 mark_init_elapsed_time_ms); |
887 | |
888 void record_mark_closure_time(double mark_closure_time_ms); | |
889 | |
890 virtual void record_concurrent_mark_remark_start(); | |
891 virtual void record_concurrent_mark_remark_end(); | |
892 | |
893 virtual void record_concurrent_mark_cleanup_start(); | |
894 virtual void record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
895 size_t max_live_bytes); | |
896 virtual void record_concurrent_mark_cleanup_completed(); | |
897 | |
898 virtual void record_concurrent_pause(); | |
899 virtual void record_concurrent_pause_end(); | |
900 | |
1707 | 901 virtual void record_collection_pause_end(); |
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902 void print_heap_transition(); |
342 | 903 |
904 // Record the fact that a full collection occurred. | |
905 virtual void record_full_collection_start(); | |
906 virtual void record_full_collection_end(); | |
907 | |
1611 | 908 void record_gc_worker_start_time(int worker_i, double ms) { |
909 _par_last_gc_worker_start_times_ms[worker_i] = ms; | |
910 } | |
911 | |
342 | 912 void record_ext_root_scan_time(int worker_i, double ms) { |
913 _par_last_ext_root_scan_times_ms[worker_i] = ms; | |
914 } | |
915 | |
916 void record_mark_stack_scan_time(int worker_i, double ms) { | |
917 _par_last_mark_stack_scan_times_ms[worker_i] = ms; | |
918 } | |
919 | |
920 void record_satb_drain_time(double ms) { | |
921 _cur_satb_drain_time_ms = ms; | |
922 _satb_drain_time_set = true; | |
923 } | |
924 | |
925 void record_satb_drain_processed_buffers (int processed_buffers) { | |
926 _last_satb_drain_processed_buffers = processed_buffers; | |
927 } | |
928 | |
929 void record_mod_union_time(double ms) { | |
930 _all_mod_union_times_ms->add(ms); | |
931 } | |
932 | |
933 void record_update_rs_time(int thread, double ms) { | |
934 _par_last_update_rs_times_ms[thread] = ms; | |
935 } | |
936 | |
937 void record_update_rs_processed_buffers (int thread, | |
938 double processed_buffers) { | |
939 _par_last_update_rs_processed_buffers[thread] = processed_buffers; | |
940 } | |
941 | |
942 void record_scan_rs_time(int thread, double ms) { | |
943 _par_last_scan_rs_times_ms[thread] = ms; | |
944 } | |
945 | |
946 void reset_obj_copy_time(int thread) { | |
947 _par_last_obj_copy_times_ms[thread] = 0.0; | |
948 } | |
949 | |
950 void reset_obj_copy_time() { | |
951 reset_obj_copy_time(0); | |
952 } | |
953 | |
954 void record_obj_copy_time(int thread, double ms) { | |
955 _par_last_obj_copy_times_ms[thread] += ms; | |
956 } | |
957 | |
1611 | 958 void record_termination(int thread, double ms, size_t attempts) { |
959 _par_last_termination_times_ms[thread] = ms; | |
960 _par_last_termination_attempts[thread] = (double) attempts; | |
342 | 961 } |
962 | |
1611 | 963 void record_gc_worker_end_time(int worker_i, double ms) { |
964 _par_last_gc_worker_end_times_ms[worker_i] = ms; | |
342 | 965 } |
966 | |
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967 void record_pause_time_ms(double ms) { |
342 | 968 _last_pause_time_ms = ms; |
969 } | |
970 | |
971 void record_clear_ct_time(double ms) { | |
972 _cur_clear_ct_time_ms = ms; | |
973 } | |
974 | |
975 void record_par_time(double ms) { | |
976 _cur_collection_par_time_ms = ms; | |
977 } | |
978 | |
979 void record_aux_start_time(int i) { | |
980 guarantee(i < _aux_num, "should be within range"); | |
981 _cur_aux_start_times_ms[i] = os::elapsedTime() * 1000.0; | |
982 } | |
983 | |
984 void record_aux_end_time(int i) { | |
985 guarantee(i < _aux_num, "should be within range"); | |
986 double ms = os::elapsedTime() * 1000.0 - _cur_aux_start_times_ms[i]; | |
987 _cur_aux_times_set[i] = true; | |
988 _cur_aux_times_ms[i] += ms; | |
989 } | |
990 | |
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991 void record_ref_proc_time(double ms) { |
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992 _cur_ref_proc_time_ms = ms; |
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993 } |
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994 |
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995 void record_ref_enq_time(double ms) { |
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996 _cur_ref_enq_time_ms = ms; |
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997 } |
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998 |
890
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999 #ifndef PRODUCT |
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1000 void record_cc_clear_time(double ms) { |
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1001 if (_min_clear_cc_time_ms < 0.0 || ms <= _min_clear_cc_time_ms) |
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1002 _min_clear_cc_time_ms = ms; |
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1003 if (_max_clear_cc_time_ms < 0.0 || ms >= _max_clear_cc_time_ms) |
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1004 _max_clear_cc_time_ms = ms; |
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1005 _cur_clear_cc_time_ms = ms; |
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1006 _cum_clear_cc_time_ms += ms; |
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1007 _num_cc_clears++; |
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1008 } |
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1009 #endif |
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1010 |
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1011 // Record how much space we copied during a GC. This is typically |
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1012 // called when a GC alloc region is being retired. |
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1013 void record_bytes_copied_during_gc(size_t bytes) { |
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1014 _bytes_copied_during_gc += bytes; |
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1015 } |
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1016 |
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1017 // The amount of space we copied during a GC. |
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1018 size_t bytes_copied_during_gc() { |
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1019 return _bytes_copied_during_gc; |
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1020 } |
342 | 1021 |
1022 // Choose a new collection set. Marks the chosen regions as being | |
1023 // "in_collection_set", and links them together. The head and number of | |
1024 // the collection set are available via access methods. | |
1707 | 1025 virtual void choose_collection_set(double target_pause_time_ms) = 0; |
342 | 1026 |
1027 // The head of the list (via "next_in_collection_set()") representing the | |
1028 // current collection set. | |
1029 HeapRegion* collection_set() { return _collection_set; } | |
1030 | |
1394
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1031 void clear_collection_set() { _collection_set = NULL; } |
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1032 |
342 | 1033 // The number of elements in the current collection set. |
1034 size_t collection_set_size() { return _collection_set_size; } | |
1035 | |
1036 // Add "hr" to the CS. | |
1037 void add_to_collection_set(HeapRegion* hr); | |
1038 | |
1394
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1039 // Incremental CSet Support |
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1040 |
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1041 // The head of the incrementally built collection set. |
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1042 HeapRegion* inc_cset_head() { return _inc_cset_head; } |
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1043 |
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1044 // The tail of the incrementally built collection set. |
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1045 HeapRegion* inc_set_tail() { return _inc_cset_tail; } |
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1046 |
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1047 // The number of elements in the incrementally built collection set. |
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1048 size_t inc_cset_size() { return _inc_cset_size; } |
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1049 |
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1050 // Initialize incremental collection set info. |
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1051 void start_incremental_cset_building(); |
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1052 |
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1053 void clear_incremental_cset() { |
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1054 _inc_cset_head = NULL; |
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1055 _inc_cset_tail = NULL; |
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1056 } |
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1057 |
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1058 // Stop adding regions to the incremental collection set |
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1059 void stop_incremental_cset_building() { _inc_cset_build_state = Inactive; } |
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1060 |
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1061 // Add/remove information about hr to the aggregated information |
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1062 // for the incrementally built collection set. |
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1063 void add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length); |
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1064 void remove_from_incremental_cset_info(HeapRegion* hr); |
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1065 |
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1066 // Update information about hr in the aggregated information for |
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1067 // the incrementally built collection set. |
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1068 void update_incremental_cset_info(HeapRegion* hr, size_t new_rs_length); |
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1069 |
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1070 private: |
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1071 // Update the incremental cset information when adding a region |
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1072 // (should not be called directly). |
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1073 void add_region_to_incremental_cset_common(HeapRegion* hr); |
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1074 |
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1075 public: |
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1076 // Add hr to the LHS of the incremental collection set. |
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1077 void add_region_to_incremental_cset_lhs(HeapRegion* hr); |
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1078 |
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|
1079 // Add hr to the RHS of the incremental collection set. |
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1080 void add_region_to_incremental_cset_rhs(HeapRegion* hr); |
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1081 |
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1082 #ifndef PRODUCT |
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1083 void print_collection_set(HeapRegion* list_head, outputStream* st); |
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1084 #endif // !PRODUCT |
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1085 |
1359
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1086 bool initiate_conc_mark_if_possible() { return _initiate_conc_mark_if_possible; } |
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1087 void set_initiate_conc_mark_if_possible() { _initiate_conc_mark_if_possible = true; } |
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1088 void clear_initiate_conc_mark_if_possible() { _initiate_conc_mark_if_possible = false; } |
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1089 |
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1090 bool during_initial_mark_pause() { return _during_initial_mark_pause; } |
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1091 void set_during_initial_mark_pause() { _during_initial_mark_pause = true; } |
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1092 void clear_during_initial_mark_pause(){ _during_initial_mark_pause = false; } |
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1093 |
1656
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1094 // This sets the initiate_conc_mark_if_possible() flag to start a |
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1095 // new cycle, as long as we are not already in one. It's best if it |
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1096 // is called during a safepoint when the test whether a cycle is in |
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1097 // progress or not is stable. |
3914
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1098 bool force_initial_mark_if_outside_cycle(GCCause::Cause gc_cause); |
1656
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1099 |
1359
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1100 // This is called at the very beginning of an evacuation pause (it |
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1101 // has to be the first thing that the pause does). If |
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1102 // initiate_conc_mark_if_possible() is true, and the concurrent |
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1103 // marking thread has completed its work during the previous cycle, |
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1104 // it will set during_initial_mark_pause() to so that the pause does |
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1105 // the initial-mark work and start a marking cycle. |
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1106 void decide_on_conc_mark_initiation(); |
342 | 1107 |
1108 // If an expansion would be appropriate, because recent GC overhead had | |
1109 // exceeded the desired limit, return an amount to expand by. | |
1110 virtual size_t expansion_amount(); | |
1111 | |
1112 // note start of mark thread | |
1113 void note_start_of_mark_thread(); | |
1114 | |
1115 // The marked bytes of the "r" has changed; reclassify it's desirability | |
1116 // for marking. Also asserts that "r" is eligible for a CS. | |
1117 virtual void note_change_in_marked_bytes(HeapRegion* r) = 0; | |
1118 | |
1119 #ifndef PRODUCT | |
1120 // Check any appropriate marked bytes info, asserting false if | |
1121 // something's wrong, else returning "true". | |
1122 virtual bool assertMarkedBytesDataOK() = 0; | |
1123 #endif | |
1124 | |
1125 // Print tracing information. | |
1126 void print_tracing_info() const; | |
1127 | |
1128 // Print stats on young survival ratio | |
1129 void print_yg_surv_rate_info() const; | |
1130 | |
545 | 1131 void finished_recalculating_age_indexes(bool is_survivors) { |
1132 if (is_survivors) { | |
1133 _survivor_surv_rate_group->finished_recalculating_age_indexes(); | |
1134 } else { | |
1135 _short_lived_surv_rate_group->finished_recalculating_age_indexes(); | |
1136 } | |
342 | 1137 // do that for any other surv rate groups |
1138 } | |
1139 | |
1973 | 1140 bool is_young_list_full() { |
1141 size_t young_list_length = _g1->young_list()->length(); | |
1991
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1142 size_t young_list_target_length = _young_list_target_length; |
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1143 return young_list_length >= young_list_target_length; |
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1144 } |
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1145 |
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1146 bool can_expand_young_list() { |
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1147 size_t young_list_length = _g1->young_list()->length(); |
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1148 size_t young_list_max_length = _young_list_max_length; |
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1149 return young_list_length < young_list_max_length; |
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1150 } |
1973 | 1151 |
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1152 size_t young_list_max_length() { |
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1153 return _young_list_max_length; |
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1154 } |
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1155 |
1973 | 1156 void update_region_num(bool young); |
342 | 1157 |
1158 bool full_young_gcs() { | |
1159 return _full_young_gcs; | |
1160 } | |
1161 void set_full_young_gcs(bool full_young_gcs) { | |
1162 _full_young_gcs = full_young_gcs; | |
1163 } | |
1164 | |
1165 bool adaptive_young_list_length() { | |
1166 return _adaptive_young_list_length; | |
1167 } | |
1168 void set_adaptive_young_list_length(bool adaptive_young_list_length) { | |
1169 _adaptive_young_list_length = adaptive_young_list_length; | |
1170 } | |
1171 | |
1172 inline double get_gc_eff_factor() { | |
1173 double ratio = _known_garbage_ratio; | |
1174 | |
1175 double square = ratio * ratio; | |
1176 // square = square * square; | |
1177 double ret = square * 9.0 + 1.0; | |
1178 #if 0 | |
1179 gclog_or_tty->print_cr("ratio = %1.2lf, ret = %1.2lf", ratio, ret); | |
1180 #endif // 0 | |
1181 guarantee(0.0 <= ret && ret < 10.0, "invariant!"); | |
1182 return ret; | |
1183 } | |
1184 | |
1185 // | |
1186 // Survivor regions policy. | |
1187 // | |
1188 protected: | |
1189 | |
1190 // Current tenuring threshold, set to 0 if the collector reaches the | |
1191 // maximum amount of suvivors regions. | |
1192 int _tenuring_threshold; | |
1193 | |
545 | 1194 // The limit on the number of regions allocated for survivors. |
1195 size_t _max_survivor_regions; | |
1196 | |
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1197 // For reporting purposes. |
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1198 size_t _eden_bytes_before_gc; |
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1199 size_t _survivor_bytes_before_gc; |
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1200 size_t _capacity_before_gc; |
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1201 |
545 | 1202 // The amount of survor regions after a collection. |
1203 size_t _recorded_survivor_regions; | |
1204 // List of survivor regions. | |
1205 HeapRegion* _recorded_survivor_head; | |
1206 HeapRegion* _recorded_survivor_tail; | |
1207 | |
1208 ageTable _survivors_age_table; | |
1209 | |
342 | 1210 public: |
1211 | |
1212 inline GCAllocPurpose | |
1213 evacuation_destination(HeapRegion* src_region, int age, size_t word_sz) { | |
1214 if (age < _tenuring_threshold && src_region->is_young()) { | |
1215 return GCAllocForSurvived; | |
1216 } else { | |
1217 return GCAllocForTenured; | |
1218 } | |
1219 } | |
1220 | |
1221 inline bool track_object_age(GCAllocPurpose purpose) { | |
1222 return purpose == GCAllocForSurvived; | |
1223 } | |
1224 | |
545 | 1225 static const size_t REGIONS_UNLIMITED = ~(size_t)0; |
1226 | |
1227 size_t max_regions(int purpose); | |
342 | 1228 |
1229 // The limit on regions for a particular purpose is reached. | |
1230 void note_alloc_region_limit_reached(int purpose) { | |
1231 if (purpose == GCAllocForSurvived) { | |
1232 _tenuring_threshold = 0; | |
1233 } | |
1234 } | |
1235 | |
1236 void note_start_adding_survivor_regions() { | |
1237 _survivor_surv_rate_group->start_adding_regions(); | |
1238 } | |
1239 | |
1240 void note_stop_adding_survivor_regions() { | |
1241 _survivor_surv_rate_group->stop_adding_regions(); | |
1242 } | |
545 | 1243 |
1244 void record_survivor_regions(size_t regions, | |
1245 HeapRegion* head, | |
1246 HeapRegion* tail) { | |
1247 _recorded_survivor_regions = regions; | |
1248 _recorded_survivor_head = head; | |
1249 _recorded_survivor_tail = tail; | |
1250 } | |
1251 | |
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1252 size_t recorded_survivor_regions() { |
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1253 return _recorded_survivor_regions; |
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1254 } |
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1255 |
545 | 1256 void record_thread_age_table(ageTable* age_table) |
1257 { | |
1258 _survivors_age_table.merge_par(age_table); | |
1259 } | |
1260 | |
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1261 void update_max_gc_locker_expansion(); |
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1262 |
545 | 1263 // Calculates survivor space parameters. |
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1264 void update_survivors_policy(); |
545 | 1265 |
342 | 1266 }; |
1267 | |
1268 // This encapsulates a particular strategy for a g1 Collector. | |
1269 // | |
1270 // Start a concurrent mark when our heap size is n bytes | |
1271 // greater then our heap size was at the last concurrent | |
1272 // mark. Where n is a function of the CMSTriggerRatio | |
1273 // and the MinHeapFreeRatio. | |
1274 // | |
1275 // Start a g1 collection pause when we have allocated the | |
1276 // average number of bytes currently being freed in | |
1277 // a collection, but only if it is at least one region | |
1278 // full | |
1279 // | |
1280 // Resize Heap based on desired | |
1281 // allocation space, where desired allocation space is | |
1282 // a function of survival rate and desired future to size. | |
1283 // | |
1284 // Choose collection set by first picking all older regions | |
1285 // which have a survival rate which beats our projected young | |
1286 // survival rate. Then fill out the number of needed regions | |
1287 // with young regions. | |
1288 | |
1289 class G1CollectorPolicy_BestRegionsFirst: public G1CollectorPolicy { | |
1290 CollectionSetChooser* _collectionSetChooser; | |
1291 | |
1707 | 1292 virtual void choose_collection_set(double target_pause_time_ms); |
342 | 1293 virtual void record_collection_pause_start(double start_time_sec, |
1294 size_t start_used); | |
1295 virtual void record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
1296 size_t max_live_bytes); | |
1297 virtual void record_full_collection_end(); | |
1298 | |
1299 public: | |
1300 G1CollectorPolicy_BestRegionsFirst() { | |
1301 _collectionSetChooser = new CollectionSetChooser(); | |
1302 } | |
1707 | 1303 void record_collection_pause_end(); |
342 | 1304 // This is not needed any more, after the CSet choosing code was |
1305 // changed to use the pause prediction work. But let's leave the | |
1306 // hook in just in case. | |
1307 void note_change_in_marked_bytes(HeapRegion* r) { } | |
1308 #ifndef PRODUCT | |
1309 bool assertMarkedBytesDataOK(); | |
1310 #endif | |
1311 }; | |
1312 | |
1313 // This should move to some place more general... | |
1314 | |
1315 // If we have "n" measurements, and we've kept track of their "sum" and the | |
1316 // "sum_of_squares" of the measurements, this returns the variance of the | |
1317 // sequence. | |
1318 inline double variance(int n, double sum_of_squares, double sum) { | |
1319 double n_d = (double)n; | |
1320 double avg = sum/n_d; | |
1321 return (sum_of_squares - 2.0 * avg * sum + n_d * avg * avg) / n_d; | |
1322 } | |
1323 | |
1972 | 1324 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTORPOLICY_HPP |