Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.hpp @ 4096:00dd86e542eb
7114303: G1: assert(_g1->mark_in_progress()) failed: shouldn't be here otherwise
Summary: Race between the VM thread reading G1CollectedHeap::_mark_in_progress and it being set by the concurrent mark thread when concurrent marking is aborted by a full GC. Have the concurrent mark thread join the SuspendibleThreadSet before changing the marking state.
Reviewed-by: tonyp, brutisso
author | johnc |
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date | Mon, 28 Nov 2011 09:49:05 -0800 |
parents | bca17e38de00 |
children | dc467e8b2c5e |
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) | |
4023 | 77 define_num_seq(clear_ct) |
342 | 78 }; |
79 | |
677 | 80 class Summary: public PauseSummary, |
81 public MainBodySummary { | |
342 | 82 public: |
83 virtual MainBodySummary* main_body_summary() { return this; } | |
84 }; | |
85 | |
86 class G1CollectorPolicy: public CollectorPolicy { | |
4013 | 87 private: |
342 | 88 // either equal to the number of parallel threads, if ParallelGCThreads |
89 // has been set, or 1 otherwise | |
90 int _parallel_gc_threads; | |
91 | |
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92 // The number of GC threads currently active. |
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93 uintx _no_of_gc_threads; |
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94 |
342 | 95 enum SomePrivateConstants { |
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96 NumPrevPausesForHeuristics = 10 |
342 | 97 }; |
98 | |
99 G1MMUTracker* _mmu_tracker; | |
100 | |
101 void initialize_flags(); | |
102 | |
103 void initialize_all() { | |
104 initialize_flags(); | |
105 initialize_size_info(); | |
106 initialize_perm_generation(PermGen::MarkSweepCompact); | |
107 } | |
108 | |
4013 | 109 CollectionSetChooser* _collectionSetChooser; |
342 | 110 |
111 double _cur_collection_start_sec; | |
112 size_t _cur_collection_pause_used_at_start_bytes; | |
113 size_t _cur_collection_pause_used_regions_at_start; | |
114 size_t _prev_collection_pause_used_at_end_bytes; | |
115 double _cur_collection_par_time_ms; | |
116 double _cur_satb_drain_time_ms; | |
117 double _cur_clear_ct_time_ms; | |
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118 double _cur_ref_proc_time_ms; |
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119 double _cur_ref_enq_time_ms; |
342 | 120 |
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121 #ifndef PRODUCT |
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122 // Card Table Count Cache stats |
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123 double _min_clear_cc_time_ms; // min |
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124 double _max_clear_cc_time_ms; // max |
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125 double _cur_clear_cc_time_ms; // clearing time during current pause |
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126 double _cum_clear_cc_time_ms; // cummulative clearing time |
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127 jlong _num_cc_clears; // number of times the card count cache has been cleared |
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128 #endif |
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129 |
342 | 130 // These exclude marking times. |
131 TruncatedSeq* _recent_gc_times_ms; | |
132 | |
133 TruncatedSeq* _concurrent_mark_remark_times_ms; | |
134 TruncatedSeq* _concurrent_mark_cleanup_times_ms; | |
135 | |
677 | 136 Summary* _summary; |
342 | 137 |
138 NumberSeq* _all_pause_times_ms; | |
139 NumberSeq* _all_full_gc_times_ms; | |
140 double _stop_world_start; | |
141 NumberSeq* _all_stop_world_times_ms; | |
142 NumberSeq* _all_yield_times_ms; | |
143 | |
144 int _aux_num; | |
145 NumberSeq* _all_aux_times_ms; | |
146 double* _cur_aux_start_times_ms; | |
147 double* _cur_aux_times_ms; | |
148 bool* _cur_aux_times_set; | |
149 | |
1611 | 150 double* _par_last_gc_worker_start_times_ms; |
342 | 151 double* _par_last_ext_root_scan_times_ms; |
152 double* _par_last_mark_stack_scan_times_ms; | |
153 double* _par_last_update_rs_times_ms; | |
154 double* _par_last_update_rs_processed_buffers; | |
155 double* _par_last_scan_rs_times_ms; | |
156 double* _par_last_obj_copy_times_ms; | |
157 double* _par_last_termination_times_ms; | |
1611 | 158 double* _par_last_termination_attempts; |
159 double* _par_last_gc_worker_end_times_ms; | |
2430 | 160 double* _par_last_gc_worker_times_ms; |
342 | 161 |
4023 | 162 // Each workers 'other' time i.e. the elapsed time of the parallel |
163 // phase of the pause minus the sum of the individual sub-phase | |
164 // times for a given worker thread. | |
165 double* _par_last_gc_worker_other_times_ms; | |
166 | |
342 | 167 // indicates whether we are in full young or partially young GC mode |
168 bool _full_young_gcs; | |
169 | |
170 // if true, then it tries to dynamically adjust the length of the | |
171 // young list | |
172 bool _adaptive_young_list_length; | |
173 size_t _young_list_target_length; | |
174 size_t _young_list_fixed_length; | |
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175 size_t _prev_eden_capacity; // used for logging |
342 | 176 |
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177 // The max number of regions we can extend the eden by while the GC |
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178 // locker is active. This should be >= _young_list_target_length; |
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179 size_t _young_list_max_length; |
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180 |
342 | 181 bool _last_young_gc_full; |
182 | |
183 unsigned _full_young_pause_num; | |
184 unsigned _partial_young_pause_num; | |
185 | |
186 bool _during_marking; | |
187 bool _in_marking_window; | |
188 bool _in_marking_window_im; | |
189 | |
190 SurvRateGroup* _short_lived_surv_rate_group; | |
191 SurvRateGroup* _survivor_surv_rate_group; | |
192 // add here any more surv rate groups | |
193 | |
1356 | 194 double _gc_overhead_perc; |
195 | |
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196 double _reserve_factor; |
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197 size_t _reserve_regions; |
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198 |
342 | 199 bool during_marking() { |
200 return _during_marking; | |
201 } | |
202 | |
203 private: | |
204 enum PredictionConstants { | |
205 TruncatedSeqLength = 10 | |
206 }; | |
207 | |
208 TruncatedSeq* _alloc_rate_ms_seq; | |
209 double _prev_collection_pause_end_ms; | |
210 | |
211 TruncatedSeq* _pending_card_diff_seq; | |
212 TruncatedSeq* _rs_length_diff_seq; | |
213 TruncatedSeq* _cost_per_card_ms_seq; | |
214 TruncatedSeq* _fully_young_cards_per_entry_ratio_seq; | |
215 TruncatedSeq* _partially_young_cards_per_entry_ratio_seq; | |
216 TruncatedSeq* _cost_per_entry_ms_seq; | |
217 TruncatedSeq* _partially_young_cost_per_entry_ms_seq; | |
218 TruncatedSeq* _cost_per_byte_ms_seq; | |
219 TruncatedSeq* _constant_other_time_ms_seq; | |
220 TruncatedSeq* _young_other_cost_per_region_ms_seq; | |
221 TruncatedSeq* _non_young_other_cost_per_region_ms_seq; | |
222 | |
223 TruncatedSeq* _pending_cards_seq; | |
224 TruncatedSeq* _rs_lengths_seq; | |
225 | |
226 TruncatedSeq* _cost_per_byte_ms_during_cm_seq; | |
227 | |
228 TruncatedSeq* _young_gc_eff_seq; | |
229 | |
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230 bool _using_new_ratio_calculations; |
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231 size_t _min_desired_young_length; // as set on the command line or default calculations |
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232 size_t _max_desired_young_length; // as set on the command line or default calculations |
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233 |
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234 size_t _eden_cset_region_length; |
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235 size_t _survivor_cset_region_length; |
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236 size_t _old_cset_region_length; |
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237 |
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238 void init_cset_region_lengths(size_t eden_cset_region_length, |
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239 size_t survivor_cset_region_length); |
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240 |
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241 size_t eden_cset_region_length() { return _eden_cset_region_length; } |
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242 size_t survivor_cset_region_length() { return _survivor_cset_region_length; } |
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243 size_t old_cset_region_length() { return _old_cset_region_length; } |
342 | 244 |
245 size_t _free_regions_at_end_of_collection; | |
246 | |
247 size_t _recorded_rs_lengths; | |
248 size_t _max_rs_lengths; | |
249 | |
250 double _recorded_young_free_cset_time_ms; | |
251 double _recorded_non_young_free_cset_time_ms; | |
252 | |
253 double _sigma; | |
254 double _expensive_region_limit_ms; | |
255 | |
256 size_t _rs_lengths_prediction; | |
257 | |
258 size_t _known_garbage_bytes; | |
259 double _known_garbage_ratio; | |
260 | |
261 double sigma() { | |
262 return _sigma; | |
263 } | |
264 | |
265 // A function that prevents us putting too much stock in small sample | |
266 // sets. Returns a number between 2.0 and 1.0, depending on the number | |
267 // of samples. 5 or more samples yields one; fewer scales linearly from | |
268 // 2.0 at 1 sample to 1.0 at 5. | |
269 double confidence_factor(int samples) { | |
270 if (samples > 4) return 1.0; | |
271 else return 1.0 + sigma() * ((double)(5 - samples))/2.0; | |
272 } | |
273 | |
274 double get_new_neg_prediction(TruncatedSeq* seq) { | |
275 return seq->davg() - sigma() * seq->dsd(); | |
276 } | |
277 | |
278 #ifndef PRODUCT | |
279 bool verify_young_ages(HeapRegion* head, SurvRateGroup *surv_rate_group); | |
280 #endif // PRODUCT | |
281 | |
1111 | 282 void adjust_concurrent_refinement(double update_rs_time, |
283 double update_rs_processed_buffers, | |
284 double goal_ms); | |
285 | |
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286 uintx no_of_gc_threads() { return _no_of_gc_threads; } |
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287 void set_no_of_gc_threads(uintx v) { _no_of_gc_threads = v; } |
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288 |
342 | 289 double _pause_time_target_ms; |
290 double _recorded_young_cset_choice_time_ms; | |
291 double _recorded_non_young_cset_choice_time_ms; | |
292 size_t _pending_cards; | |
293 size_t _max_pending_cards; | |
294 | |
295 public: | |
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296 // Accessors |
342 | 297 |
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298 void set_region_eden(HeapRegion* hr, int young_index_in_cset) { |
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299 hr->set_young(); |
342 | 300 hr->install_surv_rate_group(_short_lived_surv_rate_group); |
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301 hr->set_young_index_in_cset(young_index_in_cset); |
342 | 302 } |
303 | |
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304 void set_region_survivor(HeapRegion* hr, int young_index_in_cset) { |
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305 assert(hr->is_young() && hr->is_survivor(), "pre-condition"); |
342 | 306 hr->install_surv_rate_group(_survivor_surv_rate_group); |
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307 hr->set_young_index_in_cset(young_index_in_cset); |
342 | 308 } |
309 | |
310 #ifndef PRODUCT | |
311 bool verify_young_ages(); | |
312 #endif // PRODUCT | |
313 | |
314 double get_new_prediction(TruncatedSeq* seq) { | |
315 return MAX2(seq->davg() + sigma() * seq->dsd(), | |
316 seq->davg() * confidence_factor(seq->num())); | |
317 } | |
318 | |
319 void record_max_rs_lengths(size_t rs_lengths) { | |
320 _max_rs_lengths = rs_lengths; | |
321 } | |
322 | |
323 size_t predict_pending_card_diff() { | |
324 double prediction = get_new_neg_prediction(_pending_card_diff_seq); | |
325 if (prediction < 0.00001) | |
326 return 0; | |
327 else | |
328 return (size_t) prediction; | |
329 } | |
330 | |
331 size_t predict_pending_cards() { | |
332 size_t max_pending_card_num = _g1->max_pending_card_num(); | |
333 size_t diff = predict_pending_card_diff(); | |
334 size_t prediction; | |
335 if (diff > max_pending_card_num) | |
336 prediction = max_pending_card_num; | |
337 else | |
338 prediction = max_pending_card_num - diff; | |
339 | |
340 return prediction; | |
341 } | |
342 | |
343 size_t predict_rs_length_diff() { | |
344 return (size_t) get_new_prediction(_rs_length_diff_seq); | |
345 } | |
346 | |
347 double predict_alloc_rate_ms() { | |
348 return get_new_prediction(_alloc_rate_ms_seq); | |
349 } | |
350 | |
351 double predict_cost_per_card_ms() { | |
352 return get_new_prediction(_cost_per_card_ms_seq); | |
353 } | |
354 | |
355 double predict_rs_update_time_ms(size_t pending_cards) { | |
356 return (double) pending_cards * predict_cost_per_card_ms(); | |
357 } | |
358 | |
359 double predict_fully_young_cards_per_entry_ratio() { | |
360 return get_new_prediction(_fully_young_cards_per_entry_ratio_seq); | |
361 } | |
362 | |
363 double predict_partially_young_cards_per_entry_ratio() { | |
364 if (_partially_young_cards_per_entry_ratio_seq->num() < 2) | |
365 return predict_fully_young_cards_per_entry_ratio(); | |
366 else | |
367 return get_new_prediction(_partially_young_cards_per_entry_ratio_seq); | |
368 } | |
369 | |
370 size_t predict_young_card_num(size_t rs_length) { | |
371 return (size_t) ((double) rs_length * | |
372 predict_fully_young_cards_per_entry_ratio()); | |
373 } | |
374 | |
375 size_t predict_non_young_card_num(size_t rs_length) { | |
376 return (size_t) ((double) rs_length * | |
377 predict_partially_young_cards_per_entry_ratio()); | |
378 } | |
379 | |
380 double predict_rs_scan_time_ms(size_t card_num) { | |
381 if (full_young_gcs()) | |
382 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); | |
383 else | |
384 return predict_partially_young_rs_scan_time_ms(card_num); | |
385 } | |
386 | |
387 double predict_partially_young_rs_scan_time_ms(size_t card_num) { | |
388 if (_partially_young_cost_per_entry_ms_seq->num() < 3) | |
389 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); | |
390 else | |
391 return (double) card_num * | |
392 get_new_prediction(_partially_young_cost_per_entry_ms_seq); | |
393 } | |
394 | |
395 double predict_object_copy_time_ms_during_cm(size_t bytes_to_copy) { | |
396 if (_cost_per_byte_ms_during_cm_seq->num() < 3) | |
397 return 1.1 * (double) bytes_to_copy * | |
398 get_new_prediction(_cost_per_byte_ms_seq); | |
399 else | |
400 return (double) bytes_to_copy * | |
401 get_new_prediction(_cost_per_byte_ms_during_cm_seq); | |
402 } | |
403 | |
404 double predict_object_copy_time_ms(size_t bytes_to_copy) { | |
405 if (_in_marking_window && !_in_marking_window_im) | |
406 return predict_object_copy_time_ms_during_cm(bytes_to_copy); | |
407 else | |
408 return (double) bytes_to_copy * | |
409 get_new_prediction(_cost_per_byte_ms_seq); | |
410 } | |
411 | |
412 double predict_constant_other_time_ms() { | |
413 return get_new_prediction(_constant_other_time_ms_seq); | |
414 } | |
415 | |
416 double predict_young_other_time_ms(size_t young_num) { | |
417 return | |
418 (double) young_num * | |
419 get_new_prediction(_young_other_cost_per_region_ms_seq); | |
420 } | |
421 | |
422 double predict_non_young_other_time_ms(size_t non_young_num) { | |
423 return | |
424 (double) non_young_num * | |
425 get_new_prediction(_non_young_other_cost_per_region_ms_seq); | |
426 } | |
427 | |
428 void check_if_region_is_too_expensive(double predicted_time_ms); | |
429 | |
430 double predict_young_collection_elapsed_time_ms(size_t adjustment); | |
431 double predict_base_elapsed_time_ms(size_t pending_cards); | |
432 double predict_base_elapsed_time_ms(size_t pending_cards, | |
433 size_t scanned_cards); | |
434 size_t predict_bytes_to_copy(HeapRegion* hr); | |
435 double predict_region_elapsed_time_ms(HeapRegion* hr, bool young); | |
436 | |
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437 void set_recorded_rs_lengths(size_t rs_lengths); |
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438 |
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439 size_t cset_region_length() { return young_cset_region_length() + |
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440 old_cset_region_length(); } |
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441 size_t young_cset_region_length() { return eden_cset_region_length() + |
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442 survivor_cset_region_length(); } |
342 | 443 |
444 void record_young_free_cset_time_ms(double time_ms) { | |
445 _recorded_young_free_cset_time_ms = time_ms; | |
446 } | |
447 | |
448 void record_non_young_free_cset_time_ms(double time_ms) { | |
449 _recorded_non_young_free_cset_time_ms = time_ms; | |
450 } | |
451 | |
452 double predict_young_gc_eff() { | |
453 return get_new_neg_prediction(_young_gc_eff_seq); | |
454 } | |
455 | |
545 | 456 double predict_survivor_regions_evac_time(); |
457 | |
342 | 458 void cset_regions_freed() { |
459 bool propagate = _last_young_gc_full && !_in_marking_window; | |
460 _short_lived_surv_rate_group->all_surviving_words_recorded(propagate); | |
461 _survivor_surv_rate_group->all_surviving_words_recorded(propagate); | |
462 // also call it on any more surv rate groups | |
463 } | |
464 | |
465 void set_known_garbage_bytes(size_t known_garbage_bytes) { | |
466 _known_garbage_bytes = known_garbage_bytes; | |
467 size_t heap_bytes = _g1->capacity(); | |
468 _known_garbage_ratio = (double) _known_garbage_bytes / (double) heap_bytes; | |
469 } | |
470 | |
471 void decrease_known_garbage_bytes(size_t known_garbage_bytes) { | |
472 guarantee( _known_garbage_bytes >= known_garbage_bytes, "invariant" ); | |
473 | |
474 _known_garbage_bytes -= known_garbage_bytes; | |
475 size_t heap_bytes = _g1->capacity(); | |
476 _known_garbage_ratio = (double) _known_garbage_bytes / (double) heap_bytes; | |
477 } | |
478 | |
479 G1MMUTracker* mmu_tracker() { | |
480 return _mmu_tracker; | |
481 } | |
482 | |
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483 double max_pause_time_ms() { |
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484 return _mmu_tracker->max_gc_time() * 1000.0; |
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485 } |
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486 |
342 | 487 double predict_remark_time_ms() { |
488 return get_new_prediction(_concurrent_mark_remark_times_ms); | |
489 } | |
490 | |
491 double predict_cleanup_time_ms() { | |
492 return get_new_prediction(_concurrent_mark_cleanup_times_ms); | |
493 } | |
494 | |
495 // Returns an estimate of the survival rate of the region at yg-age | |
496 // "yg_age". | |
545 | 497 double predict_yg_surv_rate(int age, SurvRateGroup* surv_rate_group) { |
498 TruncatedSeq* seq = surv_rate_group->get_seq(age); | |
342 | 499 if (seq->num() == 0) |
500 gclog_or_tty->print("BARF! age is %d", age); | |
501 guarantee( seq->num() > 0, "invariant" ); | |
502 double pred = get_new_prediction(seq); | |
503 if (pred > 1.0) | |
504 pred = 1.0; | |
505 return pred; | |
506 } | |
507 | |
545 | 508 double predict_yg_surv_rate(int age) { |
509 return predict_yg_surv_rate(age, _short_lived_surv_rate_group); | |
510 } | |
511 | |
342 | 512 double accum_yg_surv_rate_pred(int age) { |
513 return _short_lived_surv_rate_group->accum_surv_rate_pred(age); | |
514 } | |
515 | |
4013 | 516 private: |
1611 | 517 void print_stats(int level, const char* str, double value); |
518 void print_stats(int level, const char* str, int value); | |
519 | |
2430 | 520 void print_par_stats(int level, const char* str, double* data); |
521 void print_par_sizes(int level, const char* str, double* data); | |
342 | 522 |
523 void check_other_times(int level, | |
524 NumberSeq* other_times_ms, | |
525 NumberSeq* calc_other_times_ms) const; | |
526 | |
527 void print_summary (PauseSummary* stats) const; | |
528 | |
529 void print_summary (int level, const char* str, NumberSeq* seq) const; | |
530 void print_summary_sd (int level, const char* str, NumberSeq* seq) const; | |
531 | |
532 double avg_value (double* data); | |
533 double max_value (double* data); | |
534 double sum_of_values (double* data); | |
535 double max_sum (double* data1, double* data2); | |
536 | |
537 double _last_pause_time_ms; | |
538 | |
539 size_t _bytes_in_collection_set_before_gc; | |
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540 size_t _bytes_copied_during_gc; |
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541 |
342 | 542 // Used to count used bytes in CS. |
543 friend class CountCSClosure; | |
544 | |
545 // Statistics kept per GC stoppage, pause or full. | |
546 TruncatedSeq* _recent_prev_end_times_for_all_gcs_sec; | |
547 | |
548 // Add a new GC of the given duration and end time to the record. | |
549 void update_recent_gc_times(double end_time_sec, double elapsed_ms); | |
550 | |
551 // The head of the list (via "next_in_collection_set()") representing the | |
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552 // current collection set. Set from the incrementally built collection |
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553 // set at the start of the pause. |
342 | 554 HeapRegion* _collection_set; |
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555 |
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556 // The number of bytes in the collection set before the pause. Set from |
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557 // the incrementally built collection set at the start of an evacuation |
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558 // pause. |
342 | 559 size_t _collection_set_bytes_used_before; |
560 | |
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561 // The associated information that is maintained while the incremental |
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562 // collection set is being built with young regions. Used to populate |
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563 // the recorded info for the evacuation pause. |
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564 |
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565 enum CSetBuildType { |
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566 Active, // We are actively building the collection set |
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567 Inactive // We are not actively building the collection set |
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568 }; |
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569 |
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570 CSetBuildType _inc_cset_build_state; |
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571 |
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572 // The head of the incrementally built collection set. |
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573 HeapRegion* _inc_cset_head; |
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574 |
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575 // The tail of the incrementally built collection set. |
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576 HeapRegion* _inc_cset_tail; |
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577 |
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578 // The number of bytes in the incrementally built collection set. |
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579 // Used to set _collection_set_bytes_used_before at the start of |
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580 // an evacuation pause. |
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581 size_t _inc_cset_bytes_used_before; |
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582 |
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583 // Used to record the highest end of heap region in collection set |
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584 HeapWord* _inc_cset_max_finger; |
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585 |
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586 // The RSet lengths recorded for regions in the collection set |
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587 // (updated by the periodic sampling of the regions in the |
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588 // young list/collection set). |
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589 size_t _inc_cset_recorded_rs_lengths; |
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590 |
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591 // The predicted elapsed time it will take to collect the regions |
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592 // in the collection set (updated by the periodic sampling of the |
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593 // regions in the young list/collection set). |
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594 double _inc_cset_predicted_elapsed_time_ms; |
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595 |
342 | 596 // Stash a pointer to the g1 heap. |
597 G1CollectedHeap* _g1; | |
598 | |
599 // The ratio of gc time to elapsed time, computed over recent pauses. | |
600 double _recent_avg_pause_time_ratio; | |
601 | |
602 double recent_avg_pause_time_ratio() { | |
603 return _recent_avg_pause_time_ratio; | |
604 } | |
605 | |
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606 // At the end of a pause we check the heap occupancy and we decide |
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607 // whether we will start a marking cycle during the next pause. If |
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608 // we decide that we want to do that, we will set this parameter to |
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609 // true. So, this parameter will stay true between the end of a |
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610 // pause and the beginning of a subsequent pause (not necessarily |
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611 // the next one, see the comments on the next field) when we decide |
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612 // that we will indeed start a marking cycle and do the initial-mark |
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613 // work. |
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614 volatile bool _initiate_conc_mark_if_possible; |
342 | 615 |
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616 // If initiate_conc_mark_if_possible() is set at the beginning of a |
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617 // pause, it is a suggestion that the pause should start a marking |
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618 // cycle by doing the initial-mark work. However, it is possible |
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619 // that the concurrent marking thread is still finishing up the |
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620 // previous marking cycle (e.g., clearing the next marking |
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621 // bitmap). If that is the case we cannot start a new cycle and |
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622 // we'll have to wait for the concurrent marking thread to finish |
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623 // what it is doing. In this case we will postpone the marking cycle |
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624 // initiation decision for the next pause. When we eventually decide |
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625 // to start a cycle, we will set _during_initial_mark_pause which |
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626 // will stay true until the end of the initial-mark pause and it's |
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627 // the condition that indicates that a pause is doing the |
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628 // initial-mark work. |
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629 volatile bool _during_initial_mark_pause; |
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630 |
342 | 631 bool _should_revert_to_full_young_gcs; |
632 bool _last_full_young_gc; | |
633 | |
634 // This set of variables tracks the collector efficiency, in order to | |
635 // determine whether we should initiate a new marking. | |
636 double _cur_mark_stop_world_time_ms; | |
637 double _mark_remark_start_sec; | |
638 double _mark_cleanup_start_sec; | |
639 double _mark_closure_time_ms; | |
640 | |
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641 // Update the young list target length either by setting it to the |
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642 // desired fixed value or by calculating it using G1's pause |
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643 // prediction model. If no rs_lengths parameter is passed, predict |
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644 // the RS lengths using the prediction model, otherwise use the |
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645 // given rs_lengths as the prediction. |
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646 void update_young_list_target_length(size_t rs_lengths = (size_t) -1); |
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647 |
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648 // Calculate and return the minimum desired young list target |
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649 // length. This is the minimum desired young list length according |
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650 // to the user's inputs. |
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651 size_t calculate_young_list_desired_min_length(size_t base_min_length); |
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652 |
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653 // Calculate and return the maximum desired young list target |
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654 // length. This is the maximum desired young list length according |
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655 // to the user's inputs. |
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656 size_t calculate_young_list_desired_max_length(); |
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657 |
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658 // Calculate and return the maximum young list target length that |
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659 // can fit into the pause time goal. The parameters are: rs_lengths |
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660 // represent the prediction of how large the young RSet lengths will |
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661 // be, base_min_length is the alreay existing number of regions in |
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662 // the young list, min_length and max_length are the desired min and |
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663 // max young list length according to the user's inputs. |
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664 size_t calculate_young_list_target_length(size_t rs_lengths, |
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665 size_t base_min_length, |
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666 size_t desired_min_length, |
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667 size_t desired_max_length); |
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668 |
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669 // Check whether a given young length (young_length) fits into the |
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670 // given target pause time and whether the prediction for the amount |
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671 // of objects to be copied for the given length will fit into the |
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672 // given free space (expressed by base_free_regions). It is used by |
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673 // calculate_young_list_target_length(). |
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674 bool predict_will_fit(size_t young_length, double base_time_ms, |
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675 size_t base_free_regions, double target_pause_time_ms); |
342 | 676 |
4013 | 677 // Count the number of bytes used in the CS. |
678 void count_CS_bytes_used(); | |
679 | |
680 void update_young_list_size_using_newratio(size_t number_of_heap_regions); | |
681 | |
342 | 682 public: |
683 | |
684 G1CollectorPolicy(); | |
685 | |
686 virtual G1CollectorPolicy* as_g1_policy() { return this; } | |
687 | |
688 virtual CollectorPolicy::Name kind() { | |
689 return CollectorPolicy::G1CollectorPolicyKind; | |
690 } | |
691 | |
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692 // Check the current value of the young list RSet lengths and |
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693 // compare it against the last prediction. If the current value is |
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694 // higher, recalculate the young list target length prediction. |
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695 void revise_young_list_target_length_if_necessary(); |
342 | 696 |
697 size_t bytes_in_collection_set() { | |
698 return _bytes_in_collection_set_before_gc; | |
699 } | |
700 | |
701 unsigned calc_gc_alloc_time_stamp() { | |
702 return _all_pause_times_ms->num() + 1; | |
703 } | |
704 | |
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705 // This should be called after the heap is resized. |
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706 void record_new_heap_size(size_t new_number_of_regions); |
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707 |
342 | 708 public: |
709 | |
4013 | 710 void init(); |
342 | 711 |
545 | 712 // Create jstat counters for the policy. |
713 virtual void initialize_gc_policy_counters(); | |
714 | |
342 | 715 virtual HeapWord* mem_allocate_work(size_t size, |
716 bool is_tlab, | |
717 bool* gc_overhead_limit_was_exceeded); | |
718 | |
719 // This method controls how a collector handles one or more | |
720 // of its generations being fully allocated. | |
721 virtual HeapWord* satisfy_failed_allocation(size_t size, | |
722 bool is_tlab); | |
723 | |
724 BarrierSet::Name barrier_set_name() { return BarrierSet::G1SATBCTLogging; } | |
725 | |
726 GenRemSet::Name rem_set_name() { return GenRemSet::CardTable; } | |
727 | |
728 // Update the heuristic info to record a collection pause of the given | |
729 // start time, where the given number of bytes were used at the start. | |
730 // This may involve changing the desired size of a collection set. | |
731 | |
4013 | 732 void record_stop_world_start(); |
342 | 733 |
4013 | 734 void record_collection_pause_start(double start_time_sec, size_t start_used); |
342 | 735 |
736 // Must currently be called while the world is stopped. | |
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737 void record_concurrent_mark_init_end(double |
342 | 738 mark_init_elapsed_time_ms); |
739 | |
740 void record_mark_closure_time(double mark_closure_time_ms); | |
741 | |
4013 | 742 void record_concurrent_mark_remark_start(); |
743 void record_concurrent_mark_remark_end(); | |
342 | 744 |
4013 | 745 void record_concurrent_mark_cleanup_start(); |
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746 void record_concurrent_mark_cleanup_end(int no_of_gc_threads); |
4013 | 747 void record_concurrent_mark_cleanup_completed(); |
342 | 748 |
4013 | 749 void record_concurrent_pause(); |
750 void record_concurrent_pause_end(); | |
342 | 751 |
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752 void record_collection_pause_end(int no_of_gc_threads); |
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753 void print_heap_transition(); |
342 | 754 |
755 // Record the fact that a full collection occurred. | |
4013 | 756 void record_full_collection_start(); |
757 void record_full_collection_end(); | |
342 | 758 |
1611 | 759 void record_gc_worker_start_time(int worker_i, double ms) { |
760 _par_last_gc_worker_start_times_ms[worker_i] = ms; | |
761 } | |
762 | |
342 | 763 void record_ext_root_scan_time(int worker_i, double ms) { |
764 _par_last_ext_root_scan_times_ms[worker_i] = ms; | |
765 } | |
766 | |
767 void record_mark_stack_scan_time(int worker_i, double ms) { | |
768 _par_last_mark_stack_scan_times_ms[worker_i] = ms; | |
769 } | |
770 | |
771 void record_satb_drain_time(double ms) { | |
4023 | 772 assert(_g1->mark_in_progress(), "shouldn't be here otherwise"); |
342 | 773 _cur_satb_drain_time_ms = ms; |
774 } | |
775 | |
776 void record_update_rs_time(int thread, double ms) { | |
777 _par_last_update_rs_times_ms[thread] = ms; | |
778 } | |
779 | |
780 void record_update_rs_processed_buffers (int thread, | |
781 double processed_buffers) { | |
782 _par_last_update_rs_processed_buffers[thread] = processed_buffers; | |
783 } | |
784 | |
785 void record_scan_rs_time(int thread, double ms) { | |
786 _par_last_scan_rs_times_ms[thread] = ms; | |
787 } | |
788 | |
789 void reset_obj_copy_time(int thread) { | |
790 _par_last_obj_copy_times_ms[thread] = 0.0; | |
791 } | |
792 | |
793 void reset_obj_copy_time() { | |
794 reset_obj_copy_time(0); | |
795 } | |
796 | |
797 void record_obj_copy_time(int thread, double ms) { | |
798 _par_last_obj_copy_times_ms[thread] += ms; | |
799 } | |
800 | |
1611 | 801 void record_termination(int thread, double ms, size_t attempts) { |
802 _par_last_termination_times_ms[thread] = ms; | |
803 _par_last_termination_attempts[thread] = (double) attempts; | |
342 | 804 } |
805 | |
1611 | 806 void record_gc_worker_end_time(int worker_i, double ms) { |
807 _par_last_gc_worker_end_times_ms[worker_i] = ms; | |
342 | 808 } |
809 | |
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810 void record_pause_time_ms(double ms) { |
342 | 811 _last_pause_time_ms = ms; |
812 } | |
813 | |
814 void record_clear_ct_time(double ms) { | |
815 _cur_clear_ct_time_ms = ms; | |
816 } | |
817 | |
818 void record_par_time(double ms) { | |
819 _cur_collection_par_time_ms = ms; | |
820 } | |
821 | |
822 void record_aux_start_time(int i) { | |
823 guarantee(i < _aux_num, "should be within range"); | |
824 _cur_aux_start_times_ms[i] = os::elapsedTime() * 1000.0; | |
825 } | |
826 | |
827 void record_aux_end_time(int i) { | |
828 guarantee(i < _aux_num, "should be within range"); | |
829 double ms = os::elapsedTime() * 1000.0 - _cur_aux_start_times_ms[i]; | |
830 _cur_aux_times_set[i] = true; | |
831 _cur_aux_times_ms[i] += ms; | |
832 } | |
833 | |
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834 void record_ref_proc_time(double ms) { |
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835 _cur_ref_proc_time_ms = ms; |
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836 } |
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837 |
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838 void record_ref_enq_time(double ms) { |
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839 _cur_ref_enq_time_ms = ms; |
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840 } |
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841 |
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842 #ifndef PRODUCT |
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843 void record_cc_clear_time(double ms) { |
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844 if (_min_clear_cc_time_ms < 0.0 || ms <= _min_clear_cc_time_ms) |
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845 _min_clear_cc_time_ms = ms; |
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846 if (_max_clear_cc_time_ms < 0.0 || ms >= _max_clear_cc_time_ms) |
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847 _max_clear_cc_time_ms = ms; |
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848 _cur_clear_cc_time_ms = ms; |
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849 _cum_clear_cc_time_ms += ms; |
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850 _num_cc_clears++; |
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851 } |
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852 #endif |
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853 |
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854 // Record how much space we copied during a GC. This is typically |
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855 // called when a GC alloc region is being retired. |
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856 void record_bytes_copied_during_gc(size_t bytes) { |
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857 _bytes_copied_during_gc += bytes; |
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858 } |
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859 |
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860 // The amount of space we copied during a GC. |
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861 size_t bytes_copied_during_gc() { |
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862 return _bytes_copied_during_gc; |
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863 } |
342 | 864 |
865 // Choose a new collection set. Marks the chosen regions as being | |
866 // "in_collection_set", and links them together. The head and number of | |
867 // the collection set are available via access methods. | |
4013 | 868 void choose_collection_set(double target_pause_time_ms); |
342 | 869 |
870 // The head of the list (via "next_in_collection_set()") representing the | |
871 // current collection set. | |
872 HeapRegion* collection_set() { return _collection_set; } | |
873 | |
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874 void clear_collection_set() { _collection_set = NULL; } |
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875 |
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876 // Add old region "hr" to the CSet. |
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877 void add_old_region_to_cset(HeapRegion* hr); |
342 | 878 |
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879 // Incremental CSet Support |
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880 |
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881 // The head of the incrementally built collection set. |
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882 HeapRegion* inc_cset_head() { return _inc_cset_head; } |
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883 |
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884 // The tail of the incrementally built collection set. |
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885 HeapRegion* inc_set_tail() { return _inc_cset_tail; } |
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886 |
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887 // Initialize incremental collection set info. |
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888 void start_incremental_cset_building(); |
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889 |
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890 void clear_incremental_cset() { |
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891 _inc_cset_head = NULL; |
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892 _inc_cset_tail = NULL; |
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893 } |
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894 |
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895 // Stop adding regions to the incremental collection set |
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896 void stop_incremental_cset_building() { _inc_cset_build_state = Inactive; } |
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897 |
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898 // Add/remove information about hr to the aggregated information |
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899 // for the incrementally built collection set. |
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900 void add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length); |
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901 void remove_from_incremental_cset_info(HeapRegion* hr); |
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902 |
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903 // Update information about hr in the aggregated information for |
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904 // the incrementally built collection set. |
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905 void update_incremental_cset_info(HeapRegion* hr, size_t new_rs_length); |
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906 |
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907 private: |
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908 // Update the incremental cset information when adding a region |
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909 // (should not be called directly). |
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910 void add_region_to_incremental_cset_common(HeapRegion* hr); |
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911 |
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912 public: |
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913 // Add hr to the LHS of the incremental collection set. |
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914 void add_region_to_incremental_cset_lhs(HeapRegion* hr); |
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915 |
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916 // Add hr to the RHS of the incremental collection set. |
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917 void add_region_to_incremental_cset_rhs(HeapRegion* hr); |
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918 |
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919 #ifndef PRODUCT |
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920 void print_collection_set(HeapRegion* list_head, outputStream* st); |
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921 #endif // !PRODUCT |
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922 |
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923 bool initiate_conc_mark_if_possible() { return _initiate_conc_mark_if_possible; } |
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924 void set_initiate_conc_mark_if_possible() { _initiate_conc_mark_if_possible = true; } |
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925 void clear_initiate_conc_mark_if_possible() { _initiate_conc_mark_if_possible = false; } |
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926 |
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927 bool during_initial_mark_pause() { return _during_initial_mark_pause; } |
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928 void set_during_initial_mark_pause() { _during_initial_mark_pause = true; } |
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929 void clear_during_initial_mark_pause(){ _during_initial_mark_pause = false; } |
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930 |
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931 // This sets the initiate_conc_mark_if_possible() flag to start a |
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932 // new cycle, as long as we are not already in one. It's best if it |
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933 // is called during a safepoint when the test whether a cycle is in |
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934 // progress or not is stable. |
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935 bool force_initial_mark_if_outside_cycle(GCCause::Cause gc_cause); |
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936 |
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937 // This is called at the very beginning of an evacuation pause (it |
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938 // has to be the first thing that the pause does). If |
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939 // initiate_conc_mark_if_possible() is true, and the concurrent |
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940 // marking thread has completed its work during the previous cycle, |
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941 // it will set during_initial_mark_pause() to so that the pause does |
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942 // the initial-mark work and start a marking cycle. |
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943 void decide_on_conc_mark_initiation(); |
342 | 944 |
945 // If an expansion would be appropriate, because recent GC overhead had | |
946 // exceeded the desired limit, return an amount to expand by. | |
4013 | 947 size_t expansion_amount(); |
342 | 948 |
949 #ifndef PRODUCT | |
950 // Check any appropriate marked bytes info, asserting false if | |
951 // something's wrong, else returning "true". | |
4013 | 952 bool assertMarkedBytesDataOK(); |
342 | 953 #endif |
954 | |
955 // Print tracing information. | |
956 void print_tracing_info() const; | |
957 | |
958 // Print stats on young survival ratio | |
959 void print_yg_surv_rate_info() const; | |
960 | |
545 | 961 void finished_recalculating_age_indexes(bool is_survivors) { |
962 if (is_survivors) { | |
963 _survivor_surv_rate_group->finished_recalculating_age_indexes(); | |
964 } else { | |
965 _short_lived_surv_rate_group->finished_recalculating_age_indexes(); | |
966 } | |
342 | 967 // do that for any other surv rate groups |
968 } | |
969 | |
1973 | 970 bool is_young_list_full() { |
971 size_t young_list_length = _g1->young_list()->length(); | |
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972 size_t young_list_target_length = _young_list_target_length; |
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973 return young_list_length >= young_list_target_length; |
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974 } |
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975 |
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976 bool can_expand_young_list() { |
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977 size_t young_list_length = _g1->young_list()->length(); |
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978 size_t young_list_max_length = _young_list_max_length; |
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979 return young_list_length < young_list_max_length; |
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980 } |
1973 | 981 |
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982 size_t young_list_max_length() { |
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983 return _young_list_max_length; |
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984 } |
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985 |
342 | 986 bool full_young_gcs() { |
987 return _full_young_gcs; | |
988 } | |
989 void set_full_young_gcs(bool full_young_gcs) { | |
990 _full_young_gcs = full_young_gcs; | |
991 } | |
992 | |
993 bool adaptive_young_list_length() { | |
994 return _adaptive_young_list_length; | |
995 } | |
996 void set_adaptive_young_list_length(bool adaptive_young_list_length) { | |
997 _adaptive_young_list_length = adaptive_young_list_length; | |
998 } | |
999 | |
1000 inline double get_gc_eff_factor() { | |
1001 double ratio = _known_garbage_ratio; | |
1002 | |
1003 double square = ratio * ratio; | |
1004 // square = square * square; | |
1005 double ret = square * 9.0 + 1.0; | |
1006 #if 0 | |
1007 gclog_or_tty->print_cr("ratio = %1.2lf, ret = %1.2lf", ratio, ret); | |
1008 #endif // 0 | |
1009 guarantee(0.0 <= ret && ret < 10.0, "invariant!"); | |
1010 return ret; | |
1011 } | |
1012 | |
4013 | 1013 private: |
342 | 1014 // |
1015 // Survivor regions policy. | |
1016 // | |
1017 | |
1018 // Current tenuring threshold, set to 0 if the collector reaches the | |
1019 // maximum amount of suvivors regions. | |
1020 int _tenuring_threshold; | |
1021 | |
545 | 1022 // The limit on the number of regions allocated for survivors. |
1023 size_t _max_survivor_regions; | |
1024 | |
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1025 // For reporting purposes. |
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1026 size_t _eden_bytes_before_gc; |
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1027 size_t _survivor_bytes_before_gc; |
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1028 size_t _capacity_before_gc; |
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1029 |
545 | 1030 // The amount of survor regions after a collection. |
1031 size_t _recorded_survivor_regions; | |
1032 // List of survivor regions. | |
1033 HeapRegion* _recorded_survivor_head; | |
1034 HeapRegion* _recorded_survivor_tail; | |
1035 | |
1036 ageTable _survivors_age_table; | |
1037 | |
342 | 1038 public: |
1039 | |
1040 inline GCAllocPurpose | |
1041 evacuation_destination(HeapRegion* src_region, int age, size_t word_sz) { | |
1042 if (age < _tenuring_threshold && src_region->is_young()) { | |
1043 return GCAllocForSurvived; | |
1044 } else { | |
1045 return GCAllocForTenured; | |
1046 } | |
1047 } | |
1048 | |
1049 inline bool track_object_age(GCAllocPurpose purpose) { | |
1050 return purpose == GCAllocForSurvived; | |
1051 } | |
1052 | |
545 | 1053 static const size_t REGIONS_UNLIMITED = ~(size_t)0; |
1054 | |
1055 size_t max_regions(int purpose); | |
342 | 1056 |
1057 // The limit on regions for a particular purpose is reached. | |
1058 void note_alloc_region_limit_reached(int purpose) { | |
1059 if (purpose == GCAllocForSurvived) { | |
1060 _tenuring_threshold = 0; | |
1061 } | |
1062 } | |
1063 | |
1064 void note_start_adding_survivor_regions() { | |
1065 _survivor_surv_rate_group->start_adding_regions(); | |
1066 } | |
1067 | |
1068 void note_stop_adding_survivor_regions() { | |
1069 _survivor_surv_rate_group->stop_adding_regions(); | |
1070 } | |
545 | 1071 |
1072 void record_survivor_regions(size_t regions, | |
1073 HeapRegion* head, | |
1074 HeapRegion* tail) { | |
1075 _recorded_survivor_regions = regions; | |
1076 _recorded_survivor_head = head; | |
1077 _recorded_survivor_tail = tail; | |
1078 } | |
1079 | |
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1080 size_t recorded_survivor_regions() { |
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1081 return _recorded_survivor_regions; |
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1082 } |
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1083 |
545 | 1084 void record_thread_age_table(ageTable* age_table) |
1085 { | |
1086 _survivors_age_table.merge_par(age_table); | |
1087 } | |
1088 | |
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1089 void update_max_gc_locker_expansion(); |
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1090 |
545 | 1091 // Calculates survivor space parameters. |
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1092 void update_survivors_policy(); |
545 | 1093 |
342 | 1094 }; |
1095 | |
1096 // This should move to some place more general... | |
1097 | |
1098 // If we have "n" measurements, and we've kept track of their "sum" and the | |
1099 // "sum_of_squares" of the measurements, this returns the variance of the | |
1100 // sequence. | |
1101 inline double variance(int n, double sum_of_squares, double sum) { | |
1102 double n_d = (double)n; | |
1103 double avg = sum/n_d; | |
1104 return (sum_of_squares - 2.0 * avg * sum + n_d * avg * avg) / n_d; | |
1105 } | |
1106 | |
1972 | 1107 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTORPOLICY_HPP |