Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 806:821269eca479
6820167: GCALotAtAllSafepoints + FullGCALot(ScavengeALot) options crash JVM
Summary: Short-circuit gc-a-lot attempts by non-JavaThreads; SkipGCALot c'tor to elide re-entrant gc-a-lot attempts.
Reviewed-by: apetrusenko, jcoomes, jmasa, kamg
author | ysr |
---|---|
date | Thu, 11 Jun 2009 12:40:00 -0700 |
parents | 315a5d70b295 |
children | df6caf649ff7 |
rev | line source |
---|---|
342 | 1 /* |
579 | 2 * Copyright 2001-2009 Sun Microsystems, Inc. All Rights Reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_g1CollectorPolicy.cpp.incl" | |
27 | |
28 #define PREDICTIONS_VERBOSE 0 | |
29 | |
30 // <NEW PREDICTION> | |
31 | |
32 // Different defaults for different number of GC threads | |
33 // They were chosen by running GCOld and SPECjbb on debris with different | |
34 // numbers of GC threads and choosing them based on the results | |
35 | |
36 // all the same | |
37 static double rs_length_diff_defaults[] = { | |
38 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 | |
39 }; | |
40 | |
41 static double cost_per_card_ms_defaults[] = { | |
42 0.01, 0.005, 0.005, 0.003, 0.003, 0.002, 0.002, 0.0015 | |
43 }; | |
44 | |
45 static double cost_per_scan_only_region_ms_defaults[] = { | |
46 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 | |
47 }; | |
48 | |
49 // all the same | |
50 static double fully_young_cards_per_entry_ratio_defaults[] = { | |
51 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 | |
52 }; | |
53 | |
54 static double cost_per_entry_ms_defaults[] = { | |
55 0.015, 0.01, 0.01, 0.008, 0.008, 0.0055, 0.0055, 0.005 | |
56 }; | |
57 | |
58 static double cost_per_byte_ms_defaults[] = { | |
59 0.00006, 0.00003, 0.00003, 0.000015, 0.000015, 0.00001, 0.00001, 0.000009 | |
60 }; | |
61 | |
62 // these should be pretty consistent | |
63 static double constant_other_time_ms_defaults[] = { | |
64 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0 | |
65 }; | |
66 | |
67 | |
68 static double young_other_cost_per_region_ms_defaults[] = { | |
69 0.3, 0.2, 0.2, 0.15, 0.15, 0.12, 0.12, 0.1 | |
70 }; | |
71 | |
72 static double non_young_other_cost_per_region_ms_defaults[] = { | |
73 1.0, 0.7, 0.7, 0.5, 0.5, 0.42, 0.42, 0.30 | |
74 }; | |
75 | |
76 // </NEW PREDICTION> | |
77 | |
78 G1CollectorPolicy::G1CollectorPolicy() : | |
79 _parallel_gc_threads((ParallelGCThreads > 0) ? ParallelGCThreads : 1), | |
80 _n_pauses(0), | |
81 _recent_CH_strong_roots_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
82 _recent_G1_strong_roots_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
83 _recent_evac_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
84 _recent_pause_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
85 _recent_rs_sizes(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
86 _recent_gc_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
87 _all_pause_times_ms(new NumberSeq()), | |
88 _stop_world_start(0.0), | |
89 _all_stop_world_times_ms(new NumberSeq()), | |
90 _all_yield_times_ms(new NumberSeq()), | |
91 | |
92 _all_mod_union_times_ms(new NumberSeq()), | |
93 | |
677 | 94 _summary(new Summary()), |
95 _abandoned_summary(new AbandonedSummary()), | |
342 | 96 |
97 _cur_clear_ct_time_ms(0.0), | |
98 | |
99 _region_num_young(0), | |
100 _region_num_tenured(0), | |
101 _prev_region_num_young(0), | |
102 _prev_region_num_tenured(0), | |
103 | |
104 _aux_num(10), | |
105 _all_aux_times_ms(new NumberSeq[_aux_num]), | |
106 _cur_aux_start_times_ms(new double[_aux_num]), | |
107 _cur_aux_times_ms(new double[_aux_num]), | |
108 _cur_aux_times_set(new bool[_aux_num]), | |
109 | |
110 _concurrent_mark_init_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
111 _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
112 _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
113 | |
114 // <NEW PREDICTION> | |
115 | |
116 _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
117 _prev_collection_pause_end_ms(0.0), | |
118 _pending_card_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
119 _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
120 _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
121 _cost_per_scan_only_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
122 _fully_young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), | |
123 _partially_young_cards_per_entry_ratio_seq( | |
124 new TruncatedSeq(TruncatedSeqLength)), | |
125 _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
126 _partially_young_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
127 _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
128 _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
129 _cost_per_scan_only_region_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
130 _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
131 _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
132 _non_young_other_cost_per_region_ms_seq( | |
133 new TruncatedSeq(TruncatedSeqLength)), | |
134 | |
135 _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
136 _scanned_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
137 _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), | |
138 | |
751 | 139 _pause_time_target_ms((double) MaxGCPauseMillis), |
342 | 140 |
141 // </NEW PREDICTION> | |
142 | |
143 _in_young_gc_mode(false), | |
144 _full_young_gcs(true), | |
145 _full_young_pause_num(0), | |
146 _partial_young_pause_num(0), | |
147 | |
148 _during_marking(false), | |
149 _in_marking_window(false), | |
150 _in_marking_window_im(false), | |
151 | |
152 _known_garbage_ratio(0.0), | |
153 _known_garbage_bytes(0), | |
154 | |
155 _young_gc_eff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
156 _target_pause_time_ms(-1.0), | |
157 | |
158 _recent_prev_end_times_for_all_gcs_sec(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
159 | |
160 _recent_CS_bytes_used_before(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
161 _recent_CS_bytes_surviving(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
162 | |
163 _recent_avg_pause_time_ratio(0.0), | |
164 _num_markings(0), | |
165 _n_marks(0), | |
166 _n_pauses_at_mark_end(0), | |
167 | |
168 _all_full_gc_times_ms(new NumberSeq()), | |
169 | |
170 // G1PausesBtwnConcMark defaults to -1 | |
171 // so the hack is to do the cast QQQ FIXME | |
172 _pauses_btwn_concurrent_mark((size_t)G1PausesBtwnConcMark), | |
173 _n_marks_since_last_pause(0), | |
174 _conc_mark_initiated(false), | |
175 _should_initiate_conc_mark(false), | |
176 _should_revert_to_full_young_gcs(false), | |
177 _last_full_young_gc(false), | |
178 | |
179 _prev_collection_pause_used_at_end_bytes(0), | |
180 | |
181 _collection_set(NULL), | |
182 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
183 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
184 #endif // _MSC_VER | |
185 | |
186 _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", | |
187 G1YoungSurvRateNumRegionsSummary)), | |
188 _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", | |
545 | 189 G1YoungSurvRateNumRegionsSummary)), |
342 | 190 // add here any more surv rate groups |
545 | 191 _recorded_survivor_regions(0), |
192 _recorded_survivor_head(NULL), | |
193 _recorded_survivor_tail(NULL), | |
194 _survivors_age_table(true) | |
195 | |
342 | 196 { |
197 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); | |
198 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
199 | |
200 _par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads]; | |
201 _par_last_mark_stack_scan_times_ms = new double[_parallel_gc_threads]; | |
202 _par_last_scan_only_times_ms = new double[_parallel_gc_threads]; | |
203 _par_last_scan_only_regions_scanned = new double[_parallel_gc_threads]; | |
204 | |
205 _par_last_update_rs_start_times_ms = new double[_parallel_gc_threads]; | |
206 _par_last_update_rs_times_ms = new double[_parallel_gc_threads]; | |
207 _par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; | |
208 | |
209 _par_last_scan_rs_start_times_ms = new double[_parallel_gc_threads]; | |
210 _par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; | |
211 _par_last_scan_new_refs_times_ms = new double[_parallel_gc_threads]; | |
212 | |
213 _par_last_obj_copy_times_ms = new double[_parallel_gc_threads]; | |
214 | |
215 _par_last_termination_times_ms = new double[_parallel_gc_threads]; | |
216 | |
217 // start conservatively | |
751 | 218 _expensive_region_limit_ms = 0.5 * (double) MaxGCPauseMillis; |
342 | 219 |
220 // <NEW PREDICTION> | |
221 | |
222 int index; | |
223 if (ParallelGCThreads == 0) | |
224 index = 0; | |
225 else if (ParallelGCThreads > 8) | |
226 index = 7; | |
227 else | |
228 index = ParallelGCThreads - 1; | |
229 | |
230 _pending_card_diff_seq->add(0.0); | |
231 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
232 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
233 _cost_per_scan_only_region_ms_seq->add( | |
234 cost_per_scan_only_region_ms_defaults[index]); | |
235 _fully_young_cards_per_entry_ratio_seq->add( | |
236 fully_young_cards_per_entry_ratio_defaults[index]); | |
237 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); | |
238 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
239 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
240 _young_other_cost_per_region_ms_seq->add( | |
241 young_other_cost_per_region_ms_defaults[index]); | |
242 _non_young_other_cost_per_region_ms_seq->add( | |
243 non_young_other_cost_per_region_ms_defaults[index]); | |
244 | |
245 // </NEW PREDICTION> | |
246 | |
751 | 247 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
248 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; | |
342 | 249 guarantee(max_gc_time < time_slice, |
250 "Max GC time should not be greater than the time slice"); | |
251 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); | |
751 | 252 _sigma = (double) G1ConfidencePercent / 100.0; |
342 | 253 |
254 // start conservatively (around 50ms is about right) | |
255 _concurrent_mark_init_times_ms->add(0.05); | |
256 _concurrent_mark_remark_times_ms->add(0.05); | |
257 _concurrent_mark_cleanup_times_ms->add(0.20); | |
258 _tenuring_threshold = MaxTenuringThreshold; | |
259 | |
751 | 260 if (G1UseSurvivorSpaces) { |
545 | 261 // if G1FixedSurvivorSpaceSize is 0 which means the size is not |
262 // fixed, then _max_survivor_regions will be calculated at | |
547
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263 // calculate_young_list_target_config during initialization |
545 | 264 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
265 } else { | |
266 _max_survivor_regions = 0; | |
267 } | |
268 | |
342 | 269 initialize_all(); |
270 } | |
271 | |
272 // Increment "i", mod "len" | |
273 static void inc_mod(int& i, int len) { | |
274 i++; if (i == len) i = 0; | |
275 } | |
276 | |
277 void G1CollectorPolicy::initialize_flags() { | |
278 set_min_alignment(HeapRegion::GrainBytes); | |
279 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
547
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280 if (SurvivorRatio < 1) { |
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281 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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282 } |
342 | 283 CollectorPolicy::initialize_flags(); |
284 } | |
285 | |
286 void G1CollectorPolicy::init() { | |
287 // Set aside an initial future to_space. | |
288 _g1 = G1CollectedHeap::heap(); | |
289 size_t regions = Universe::heap()->capacity() / HeapRegion::GrainBytes; | |
290 | |
291 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
292 | |
293 if (G1SteadyStateUsed < 50) { | |
294 vm_exit_during_initialization("G1SteadyStateUsed must be at least 50%."); | |
295 } | |
296 if (UseConcMarkSweepGC) { | |
297 vm_exit_during_initialization("-XX:+UseG1GC is incompatible with " | |
298 "-XX:+UseConcMarkSweepGC."); | |
299 } | |
300 | |
545 | 301 initialize_gc_policy_counters(); |
302 | |
342 | 303 if (G1Gen) { |
304 _in_young_gc_mode = true; | |
305 | |
306 if (G1YoungGenSize == 0) { | |
307 set_adaptive_young_list_length(true); | |
308 _young_list_fixed_length = 0; | |
309 } else { | |
310 set_adaptive_young_list_length(false); | |
311 _young_list_fixed_length = (G1YoungGenSize / HeapRegion::GrainBytes); | |
312 } | |
313 _free_regions_at_end_of_collection = _g1->free_regions(); | |
314 _scan_only_regions_at_end_of_collection = 0; | |
315 calculate_young_list_min_length(); | |
316 guarantee( _young_list_min_length == 0, "invariant, not enough info" ); | |
317 calculate_young_list_target_config(); | |
318 } else { | |
319 _young_list_fixed_length = 0; | |
320 _in_young_gc_mode = false; | |
321 } | |
322 } | |
323 | |
545 | 324 // Create the jstat counters for the policy. |
325 void G1CollectorPolicy::initialize_gc_policy_counters() | |
326 { | |
327 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 2 + G1Gen); | |
328 } | |
329 | |
342 | 330 void G1CollectorPolicy::calculate_young_list_min_length() { |
331 _young_list_min_length = 0; | |
332 | |
333 if (!adaptive_young_list_length()) | |
334 return; | |
335 | |
336 if (_alloc_rate_ms_seq->num() > 3) { | |
337 double now_sec = os::elapsedTime(); | |
338 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; | |
339 double alloc_rate_ms = predict_alloc_rate_ms(); | |
340 int min_regions = (int) ceil(alloc_rate_ms * when_ms); | |
341 int current_region_num = (int) _g1->young_list_length(); | |
342 _young_list_min_length = min_regions + current_region_num; | |
343 } | |
344 } | |
345 | |
346 void G1CollectorPolicy::calculate_young_list_target_config() { | |
347 if (adaptive_young_list_length()) { | |
348 size_t rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); | |
349 calculate_young_list_target_config(rs_lengths); | |
350 } else { | |
351 if (full_young_gcs()) | |
352 _young_list_target_length = _young_list_fixed_length; | |
353 else | |
354 _young_list_target_length = _young_list_fixed_length / 2; | |
355 _young_list_target_length = MAX2(_young_list_target_length, (size_t)1); | |
356 size_t so_length = calculate_optimal_so_length(_young_list_target_length); | |
357 guarantee( so_length < _young_list_target_length, "invariant" ); | |
358 _young_list_so_prefix_length = so_length; | |
359 } | |
545 | 360 calculate_survivors_policy(); |
342 | 361 } |
362 | |
363 // This method calculate the optimal scan-only set for a fixed young | |
364 // gen size. I couldn't work out how to reuse the more elaborate one, | |
365 // i.e. calculate_young_list_target_config(rs_length), as the loops are | |
366 // fundamentally different (the other one finds a config for different | |
367 // S-O lengths, whereas here we need to do the opposite). | |
368 size_t G1CollectorPolicy::calculate_optimal_so_length( | |
369 size_t young_list_length) { | |
370 if (!G1UseScanOnlyPrefix) | |
371 return 0; | |
372 | |
373 if (_all_pause_times_ms->num() < 3) { | |
374 // we won't use a scan-only set at the beginning to allow the rest | |
375 // of the predictors to warm up | |
376 return 0; | |
377 } | |
378 | |
379 if (_cost_per_scan_only_region_ms_seq->num() < 3) { | |
380 // then, we'll only set the S-O set to 1 for a little bit of time, | |
381 // to get enough information on the scanning cost | |
382 return 1; | |
383 } | |
384 | |
385 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); | |
386 size_t rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); | |
387 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); | |
388 size_t scanned_cards; | |
389 if (full_young_gcs()) | |
390 scanned_cards = predict_young_card_num(adj_rs_lengths); | |
391 else | |
392 scanned_cards = predict_non_young_card_num(adj_rs_lengths); | |
393 double base_time_ms = predict_base_elapsed_time_ms(pending_cards, | |
394 scanned_cards); | |
395 | |
396 size_t so_length = 0; | |
397 double max_gc_eff = 0.0; | |
398 for (size_t i = 0; i < young_list_length; ++i) { | |
399 double gc_eff = 0.0; | |
400 double pause_time_ms = 0.0; | |
401 predict_gc_eff(young_list_length, i, base_time_ms, | |
402 &gc_eff, &pause_time_ms); | |
403 if (gc_eff > max_gc_eff) { | |
404 max_gc_eff = gc_eff; | |
405 so_length = i; | |
406 } | |
407 } | |
408 | |
409 // set it to 95% of the optimal to make sure we sample the "area" | |
410 // around the optimal length to get up-to-date survival rate data | |
411 return so_length * 950 / 1000; | |
412 } | |
413 | |
414 // This is a really cool piece of code! It finds the best | |
415 // target configuration (young length / scan-only prefix length) so | |
416 // that GC efficiency is maximized and that we also meet a pause | |
417 // time. It's a triple nested loop. These loops are explained below | |
418 // from the inside-out :-) | |
419 // | |
420 // (a) The innermost loop will try to find the optimal young length | |
421 // for a fixed S-O length. It uses a binary search to speed up the | |
422 // process. We assume that, for a fixed S-O length, as we add more | |
423 // young regions to the CSet, the GC efficiency will only go up (I'll | |
424 // skip the proof). So, using a binary search to optimize this process | |
425 // makes perfect sense. | |
426 // | |
427 // (b) The middle loop will fix the S-O length before calling the | |
428 // innermost one. It will vary it between two parameters, increasing | |
429 // it by a given increment. | |
430 // | |
431 // (c) The outermost loop will call the middle loop three times. | |
432 // (1) The first time it will explore all possible S-O length values | |
433 // from 0 to as large as it can get, using a coarse increment (to | |
434 // quickly "home in" to where the optimal seems to be). | |
435 // (2) The second time it will explore the values around the optimal | |
436 // that was found by the first iteration using a fine increment. | |
437 // (3) Once the optimal config has been determined by the second | |
438 // iteration, we'll redo the calculation, but setting the S-O length | |
439 // to 95% of the optimal to make sure we sample the "area" | |
440 // around the optimal length to get up-to-date survival rate data | |
441 // | |
442 // Termination conditions for the iterations are several: the pause | |
443 // time is over the limit, we do not have enough to-space, etc. | |
444 | |
445 void G1CollectorPolicy::calculate_young_list_target_config(size_t rs_lengths) { | |
446 guarantee( adaptive_young_list_length(), "pre-condition" ); | |
447 | |
448 double start_time_sec = os::elapsedTime(); | |
751 | 449 size_t min_reserve_perc = MAX2((size_t)2, (size_t)G1MinReservePercent); |
342 | 450 min_reserve_perc = MIN2((size_t) 50, min_reserve_perc); |
451 size_t reserve_regions = | |
452 (size_t) ((double) min_reserve_perc * (double) _g1->n_regions() / 100.0); | |
453 | |
454 if (full_young_gcs() && _free_regions_at_end_of_collection > 0) { | |
455 // we are in fully-young mode and there are free regions in the heap | |
456 | |
545 | 457 double survivor_regions_evac_time = |
458 predict_survivor_regions_evac_time(); | |
459 | |
342 | 460 size_t min_so_length = 0; |
461 size_t max_so_length = 0; | |
462 | |
463 if (G1UseScanOnlyPrefix) { | |
464 if (_all_pause_times_ms->num() < 3) { | |
465 // we won't use a scan-only set at the beginning to allow the rest | |
466 // of the predictors to warm up | |
467 min_so_length = 0; | |
468 max_so_length = 0; | |
469 } else if (_cost_per_scan_only_region_ms_seq->num() < 3) { | |
470 // then, we'll only set the S-O set to 1 for a little bit of time, | |
471 // to get enough information on the scanning cost | |
472 min_so_length = 1; | |
473 max_so_length = 1; | |
474 } else if (_in_marking_window || _last_full_young_gc) { | |
475 // no S-O prefix during a marking phase either, as at the end | |
476 // of the marking phase we'll have to use a very small young | |
477 // length target to fill up the rest of the CSet with | |
478 // non-young regions and, if we have lots of scan-only regions | |
479 // left-over, we will not be able to add any more non-young | |
480 // regions. | |
481 min_so_length = 0; | |
482 max_so_length = 0; | |
483 } else { | |
484 // this is the common case; we'll never reach the maximum, we | |
485 // one of the end conditions will fire well before that | |
486 // (hopefully!) | |
487 min_so_length = 0; | |
488 max_so_length = _free_regions_at_end_of_collection - 1; | |
489 } | |
490 } else { | |
491 // no S-O prefix, as the switch is not set, but we still need to | |
492 // do one iteration to calculate the best young target that | |
493 // meets the pause time; this way we reuse the same code instead | |
494 // of replicating it | |
495 min_so_length = 0; | |
496 max_so_length = 0; | |
497 } | |
498 | |
499 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; | |
500 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); | |
501 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); | |
502 size_t scanned_cards; | |
503 if (full_young_gcs()) | |
504 scanned_cards = predict_young_card_num(adj_rs_lengths); | |
505 else | |
506 scanned_cards = predict_non_young_card_num(adj_rs_lengths); | |
507 // calculate this once, so that we don't have to recalculate it in | |
508 // the innermost loop | |
545 | 509 double base_time_ms = predict_base_elapsed_time_ms(pending_cards, scanned_cards) |
510 + survivor_regions_evac_time; | |
342 | 511 // the result |
512 size_t final_young_length = 0; | |
513 size_t final_so_length = 0; | |
514 double final_gc_eff = 0.0; | |
515 // we'll also keep track of how many times we go into the inner loop | |
516 // this is for profiling reasons | |
517 size_t calculations = 0; | |
518 | |
519 // this determines which of the three iterations the outer loop is in | |
520 typedef enum { | |
521 pass_type_coarse, | |
522 pass_type_fine, | |
523 pass_type_final | |
524 } pass_type_t; | |
525 | |
526 // range of the outer loop's iteration | |
527 size_t from_so_length = min_so_length; | |
528 size_t to_so_length = max_so_length; | |
529 guarantee( from_so_length <= to_so_length, "invariant" ); | |
530 | |
531 // this will keep the S-O length that's found by the second | |
532 // iteration of the outer loop; we'll keep it just in case the third | |
533 // iteration fails to find something | |
534 size_t fine_so_length = 0; | |
535 | |
536 // the increment step for the coarse (first) iteration | |
537 size_t so_coarse_increments = 5; | |
538 | |
539 // the common case, we'll start with the coarse iteration | |
540 pass_type_t pass = pass_type_coarse; | |
541 size_t so_length_incr = so_coarse_increments; | |
542 | |
543 if (from_so_length == to_so_length) { | |
544 // not point in doing the coarse iteration, we'll go directly into | |
545 // the fine one (we essentially trying to find the optimal young | |
546 // length for a fixed S-O length). | |
547 so_length_incr = 1; | |
548 pass = pass_type_final; | |
549 } else if (to_so_length - from_so_length < 3 * so_coarse_increments) { | |
550 // again, the range is too short so no point in foind the coarse | |
551 // iteration either | |
552 so_length_incr = 1; | |
553 pass = pass_type_fine; | |
554 } | |
555 | |
556 bool done = false; | |
557 // this is the outermost loop | |
558 while (!done) { | |
545 | 559 #ifdef TRACE_CALC_YOUNG_CONFIG |
342 | 560 // leave this in for debugging, just in case |
561 gclog_or_tty->print_cr("searching between " SIZE_FORMAT " and " SIZE_FORMAT | |
562 ", incr " SIZE_FORMAT ", pass %s", | |
563 from_so_length, to_so_length, so_length_incr, | |
564 (pass == pass_type_coarse) ? "coarse" : | |
565 (pass == pass_type_fine) ? "fine" : "final"); | |
545 | 566 #endif // TRACE_CALC_YOUNG_CONFIG |
342 | 567 |
568 size_t so_length = from_so_length; | |
569 size_t init_free_regions = | |
570 MAX2((size_t)0, | |
571 _free_regions_at_end_of_collection + | |
572 _scan_only_regions_at_end_of_collection - reserve_regions); | |
573 | |
574 // this determines whether a configuration was found | |
575 bool gc_eff_set = false; | |
576 // this is the middle loop | |
577 while (so_length <= to_so_length) { | |
578 // base time, which excludes region-related time; again we | |
579 // calculate it once to avoid recalculating it in the | |
580 // innermost loop | |
581 double base_time_with_so_ms = | |
582 base_time_ms + predict_scan_only_time_ms(so_length); | |
583 // it's already over the pause target, go around | |
584 if (base_time_with_so_ms > target_pause_time_ms) | |
585 break; | |
586 | |
587 size_t starting_young_length = so_length+1; | |
588 | |
589 // we make sure that the short young length that makes sense | |
590 // (one more than the S-O length) is feasible | |
591 size_t min_young_length = starting_young_length; | |
592 double min_gc_eff; | |
593 bool min_ok; | |
594 ++calculations; | |
595 min_ok = predict_gc_eff(min_young_length, so_length, | |
596 base_time_with_so_ms, | |
597 init_free_regions, target_pause_time_ms, | |
598 &min_gc_eff); | |
599 | |
600 if (min_ok) { | |
601 // the shortest young length is indeed feasible; we'll know | |
602 // set up the max young length and we'll do a binary search | |
603 // between min_young_length and max_young_length | |
604 size_t max_young_length = _free_regions_at_end_of_collection - 1; | |
605 double max_gc_eff = 0.0; | |
606 bool max_ok = false; | |
607 | |
608 // the innermost loop! (finally!) | |
609 while (max_young_length > min_young_length) { | |
610 // we'll make sure that min_young_length is always at a | |
611 // feasible config | |
612 guarantee( min_ok, "invariant" ); | |
613 | |
614 ++calculations; | |
615 max_ok = predict_gc_eff(max_young_length, so_length, | |
616 base_time_with_so_ms, | |
617 init_free_regions, target_pause_time_ms, | |
618 &max_gc_eff); | |
619 | |
620 size_t diff = (max_young_length - min_young_length) / 2; | |
621 if (max_ok) { | |
622 min_young_length = max_young_length; | |
623 min_gc_eff = max_gc_eff; | |
624 min_ok = true; | |
625 } | |
626 max_young_length = min_young_length + diff; | |
627 } | |
628 | |
629 // the innermost loop found a config | |
630 guarantee( min_ok, "invariant" ); | |
631 if (min_gc_eff > final_gc_eff) { | |
632 // it's the best config so far, so we'll keep it | |
633 final_gc_eff = min_gc_eff; | |
634 final_young_length = min_young_length; | |
635 final_so_length = so_length; | |
636 gc_eff_set = true; | |
637 } | |
638 } | |
639 | |
640 // incremental the fixed S-O length and go around | |
641 so_length += so_length_incr; | |
642 } | |
643 | |
644 // this is the end of the outermost loop and we need to decide | |
645 // what to do during the next iteration | |
646 if (pass == pass_type_coarse) { | |
647 // we just did the coarse pass (first iteration) | |
648 | |
649 if (!gc_eff_set) | |
650 // we didn't find a feasible config so we'll just bail out; of | |
651 // course, it might be the case that we missed it; but I'd say | |
652 // it's a bit unlikely | |
653 done = true; | |
654 else { | |
655 // We did find a feasible config with optimal GC eff during | |
656 // the first pass. So the second pass we'll only consider the | |
657 // S-O lengths around that config with a fine increment. | |
658 | |
659 guarantee( so_length_incr == so_coarse_increments, "invariant" ); | |
660 guarantee( final_so_length >= min_so_length, "invariant" ); | |
661 | |
545 | 662 #ifdef TRACE_CALC_YOUNG_CONFIG |
342 | 663 // leave this in for debugging, just in case |
664 gclog_or_tty->print_cr(" coarse pass: SO length " SIZE_FORMAT, | |
665 final_so_length); | |
545 | 666 #endif // TRACE_CALC_YOUNG_CONFIG |
342 | 667 |
668 from_so_length = | |
669 (final_so_length - min_so_length > so_coarse_increments) ? | |
670 final_so_length - so_coarse_increments + 1 : min_so_length; | |
671 to_so_length = | |
672 (max_so_length - final_so_length > so_coarse_increments) ? | |
673 final_so_length + so_coarse_increments - 1 : max_so_length; | |
674 | |
675 pass = pass_type_fine; | |
676 so_length_incr = 1; | |
677 } | |
678 } else if (pass == pass_type_fine) { | |
679 // we just finished the second pass | |
680 | |
681 if (!gc_eff_set) { | |
682 // we didn't find a feasible config (yes, it's possible; | |
683 // notice that, sometimes, we go directly into the fine | |
684 // iteration and skip the coarse one) so we bail out | |
685 done = true; | |
686 } else { | |
687 // We did find a feasible config with optimal GC eff | |
688 guarantee( so_length_incr == 1, "invariant" ); | |
689 | |
690 if (final_so_length == 0) { | |
691 // The config is of an empty S-O set, so we'll just bail out | |
692 done = true; | |
693 } else { | |
694 // we'll go around once more, setting the S-O length to 95% | |
695 // of the optimal | |
696 size_t new_so_length = 950 * final_so_length / 1000; | |
697 | |
545 | 698 #ifdef TRACE_CALC_YOUNG_CONFIG |
342 | 699 // leave this in for debugging, just in case |
700 gclog_or_tty->print_cr(" fine pass: SO length " SIZE_FORMAT | |
701 ", setting it to " SIZE_FORMAT, | |
702 final_so_length, new_so_length); | |
545 | 703 #endif // TRACE_CALC_YOUNG_CONFIG |
342 | 704 |
705 from_so_length = new_so_length; | |
706 to_so_length = new_so_length; | |
707 fine_so_length = final_so_length; | |
708 | |
709 pass = pass_type_final; | |
710 } | |
711 } | |
712 } else if (pass == pass_type_final) { | |
713 // we just finished the final (third) pass | |
714 | |
715 if (!gc_eff_set) | |
716 // we didn't find a feasible config, so we'll just use the one | |
717 // we found during the second pass, which we saved | |
718 final_so_length = fine_so_length; | |
719 | |
720 // and we're done! | |
721 done = true; | |
722 } else { | |
723 guarantee( false, "should never reach here" ); | |
724 } | |
725 | |
726 // we now go around the outermost loop | |
727 } | |
728 | |
729 // we should have at least one region in the target young length | |
545 | 730 _young_list_target_length = |
731 MAX2((size_t) 1, final_young_length + _recorded_survivor_regions); | |
342 | 732 if (final_so_length >= final_young_length) |
733 // and we need to ensure that the S-O length is not greater than | |
734 // the target young length (this is being a bit careful) | |
735 final_so_length = 0; | |
736 _young_list_so_prefix_length = final_so_length; | |
737 guarantee( !_in_marking_window || !_last_full_young_gc || | |
738 _young_list_so_prefix_length == 0, "invariant" ); | |
739 | |
740 // let's keep an eye of how long we spend on this calculation | |
741 // right now, I assume that we'll print it when we need it; we | |
742 // should really adde it to the breakdown of a pause | |
743 double end_time_sec = os::elapsedTime(); | |
744 double elapsed_time_ms = (end_time_sec - start_time_sec) * 1000.0; | |
745 | |
545 | 746 #ifdef TRACE_CALC_YOUNG_CONFIG |
342 | 747 // leave this in for debugging, just in case |
748 gclog_or_tty->print_cr("target = %1.1lf ms, young = " SIZE_FORMAT | |
749 ", SO = " SIZE_FORMAT ", " | |
750 "elapsed %1.2lf ms, calcs: " SIZE_FORMAT " (%s%s) " | |
751 SIZE_FORMAT SIZE_FORMAT, | |
752 target_pause_time_ms, | |
753 _young_list_target_length - _young_list_so_prefix_length, | |
754 _young_list_so_prefix_length, | |
755 elapsed_time_ms, | |
756 calculations, | |
757 full_young_gcs() ? "full" : "partial", | |
758 should_initiate_conc_mark() ? " i-m" : "", | |
545 | 759 _in_marking_window, |
760 _in_marking_window_im); | |
761 #endif // TRACE_CALC_YOUNG_CONFIG | |
342 | 762 |
763 if (_young_list_target_length < _young_list_min_length) { | |
764 // bummer; this means that, if we do a pause when the optimal | |
765 // config dictates, we'll violate the pause spacing target (the | |
766 // min length was calculate based on the application's current | |
767 // alloc rate); | |
768 | |
769 // so, we have to bite the bullet, and allocate the minimum | |
770 // number. We'll violate our target, but we just can't meet it. | |
771 | |
772 size_t so_length = 0; | |
773 // a note further up explains why we do not want an S-O length | |
774 // during marking | |
775 if (!_in_marking_window && !_last_full_young_gc) | |
776 // but we can still try to see whether we can find an optimal | |
777 // S-O length | |
778 so_length = calculate_optimal_so_length(_young_list_min_length); | |
779 | |
545 | 780 #ifdef TRACE_CALC_YOUNG_CONFIG |
342 | 781 // leave this in for debugging, just in case |
782 gclog_or_tty->print_cr("adjusted target length from " | |
783 SIZE_FORMAT " to " SIZE_FORMAT | |
784 ", SO " SIZE_FORMAT, | |
785 _young_list_target_length, _young_list_min_length, | |
786 so_length); | |
545 | 787 #endif // TRACE_CALC_YOUNG_CONFIG |
342 | 788 |
789 _young_list_target_length = | |
790 MAX2(_young_list_min_length, (size_t)1); | |
791 _young_list_so_prefix_length = so_length; | |
792 } | |
793 } else { | |
794 // we are in a partially-young mode or we've run out of regions (due | |
795 // to evacuation failure) | |
796 | |
545 | 797 #ifdef TRACE_CALC_YOUNG_CONFIG |
342 | 798 // leave this in for debugging, just in case |
799 gclog_or_tty->print_cr("(partial) setting target to " SIZE_FORMAT | |
800 ", SO " SIZE_FORMAT, | |
801 _young_list_min_length, 0); | |
545 | 802 #endif // TRACE_CALC_YOUNG_CONFIG |
342 | 803 |
804 // we'll do the pause as soon as possible and with no S-O prefix | |
805 // (see above for the reasons behind the latter) | |
806 _young_list_target_length = | |
807 MAX2(_young_list_min_length, (size_t) 1); | |
808 _young_list_so_prefix_length = 0; | |
809 } | |
810 | |
811 _rs_lengths_prediction = rs_lengths; | |
812 } | |
813 | |
814 // This is used by: calculate_optimal_so_length(length). It returns | |
815 // the GC eff and predicted pause time for a particular config | |
816 void | |
817 G1CollectorPolicy::predict_gc_eff(size_t young_length, | |
818 size_t so_length, | |
819 double base_time_ms, | |
820 double* ret_gc_eff, | |
821 double* ret_pause_time_ms) { | |
822 double so_time_ms = predict_scan_only_time_ms(so_length); | |
823 double accum_surv_rate_adj = 0.0; | |
824 if (so_length > 0) | |
825 accum_surv_rate_adj = accum_yg_surv_rate_pred((int)(so_length - 1)); | |
826 double accum_surv_rate = | |
827 accum_yg_surv_rate_pred((int)(young_length - 1)) - accum_surv_rate_adj; | |
828 size_t bytes_to_copy = | |
829 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); | |
830 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); | |
831 double young_other_time_ms = | |
832 predict_young_other_time_ms(young_length - so_length); | |
833 double pause_time_ms = | |
834 base_time_ms + so_time_ms + copy_time_ms + young_other_time_ms; | |
835 size_t reclaimed_bytes = | |
836 (young_length - so_length) * HeapRegion::GrainBytes - bytes_to_copy; | |
837 double gc_eff = (double) reclaimed_bytes / pause_time_ms; | |
838 | |
839 *ret_gc_eff = gc_eff; | |
840 *ret_pause_time_ms = pause_time_ms; | |
841 } | |
842 | |
843 // This is used by: calculate_young_list_target_config(rs_length). It | |
844 // returns the GC eff of a particular config. It returns false if that | |
845 // config violates any of the end conditions of the search in the | |
846 // calling method, or true upon success. The end conditions were put | |
847 // here since it's called twice and it was best not to replicate them | |
848 // in the caller. Also, passing the parameteres avoids having to | |
849 // recalculate them in the innermost loop. | |
850 bool | |
851 G1CollectorPolicy::predict_gc_eff(size_t young_length, | |
852 size_t so_length, | |
853 double base_time_with_so_ms, | |
854 size_t init_free_regions, | |
855 double target_pause_time_ms, | |
856 double* ret_gc_eff) { | |
857 *ret_gc_eff = 0.0; | |
858 | |
859 if (young_length >= init_free_regions) | |
860 // end condition 1: not enough space for the young regions | |
861 return false; | |
862 | |
863 double accum_surv_rate_adj = 0.0; | |
864 if (so_length > 0) | |
865 accum_surv_rate_adj = accum_yg_surv_rate_pred((int)(so_length - 1)); | |
866 double accum_surv_rate = | |
867 accum_yg_surv_rate_pred((int)(young_length - 1)) - accum_surv_rate_adj; | |
868 size_t bytes_to_copy = | |
869 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); | |
870 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); | |
871 double young_other_time_ms = | |
872 predict_young_other_time_ms(young_length - so_length); | |
873 double pause_time_ms = | |
874 base_time_with_so_ms + copy_time_ms + young_other_time_ms; | |
875 | |
876 if (pause_time_ms > target_pause_time_ms) | |
877 // end condition 2: over the target pause time | |
878 return false; | |
879 | |
880 size_t reclaimed_bytes = | |
881 (young_length - so_length) * HeapRegion::GrainBytes - bytes_to_copy; | |
882 size_t free_bytes = | |
883 (init_free_regions - young_length) * HeapRegion::GrainBytes; | |
884 | |
885 if ((2.0 + sigma()) * (double) bytes_to_copy > (double) free_bytes) | |
886 // end condition 3: out of to-space (conservatively) | |
887 return false; | |
888 | |
889 // success! | |
890 double gc_eff = (double) reclaimed_bytes / pause_time_ms; | |
891 *ret_gc_eff = gc_eff; | |
892 | |
893 return true; | |
894 } | |
895 | |
545 | 896 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
897 double survivor_regions_evac_time = 0.0; | |
898 for (HeapRegion * r = _recorded_survivor_head; | |
899 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
900 r = r->get_next_young_region()) { | |
901 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); | |
902 } | |
903 return survivor_regions_evac_time; | |
904 } | |
905 | |
342 | 906 void G1CollectorPolicy::check_prediction_validity() { |
907 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); | |
908 | |
909 size_t rs_lengths = _g1->young_list_sampled_rs_lengths(); | |
910 if (rs_lengths > _rs_lengths_prediction) { | |
911 // add 10% to avoid having to recalculate often | |
912 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
913 calculate_young_list_target_config(rs_lengths_prediction); | |
914 } | |
915 } | |
916 | |
917 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, | |
918 bool is_tlab, | |
919 bool* gc_overhead_limit_was_exceeded) { | |
920 guarantee(false, "Not using this policy feature yet."); | |
921 return NULL; | |
922 } | |
923 | |
924 // This method controls how a collector handles one or more | |
925 // of its generations being fully allocated. | |
926 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
927 bool is_tlab) { | |
928 guarantee(false, "Not using this policy feature yet."); | |
929 return NULL; | |
930 } | |
931 | |
932 | |
933 #ifndef PRODUCT | |
934 bool G1CollectorPolicy::verify_young_ages() { | |
935 HeapRegion* head = _g1->young_list_first_region(); | |
936 return | |
937 verify_young_ages(head, _short_lived_surv_rate_group); | |
938 // also call verify_young_ages on any additional surv rate groups | |
939 } | |
940 | |
941 bool | |
942 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
943 SurvRateGroup *surv_rate_group) { | |
944 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
945 | |
946 const char* name = surv_rate_group->name(); | |
947 bool ret = true; | |
948 int prev_age = -1; | |
949 | |
950 for (HeapRegion* curr = head; | |
951 curr != NULL; | |
952 curr = curr->get_next_young_region()) { | |
953 SurvRateGroup* group = curr->surv_rate_group(); | |
954 if (group == NULL && !curr->is_survivor()) { | |
955 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
956 ret = false; | |
957 } | |
958 | |
959 if (surv_rate_group == group) { | |
960 int age = curr->age_in_surv_rate_group(); | |
961 | |
962 if (age < 0) { | |
963 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
964 ret = false; | |
965 } | |
966 | |
967 if (age <= prev_age) { | |
968 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
969 "(%d, %d)", name, age, prev_age); | |
970 ret = false; | |
971 } | |
972 prev_age = age; | |
973 } | |
974 } | |
975 | |
976 return ret; | |
977 } | |
978 #endif // PRODUCT | |
979 | |
980 void G1CollectorPolicy::record_full_collection_start() { | |
981 _cur_collection_start_sec = os::elapsedTime(); | |
982 // Release the future to-space so that it is available for compaction into. | |
983 _g1->set_full_collection(); | |
984 } | |
985 | |
986 void G1CollectorPolicy::record_full_collection_end() { | |
987 // Consider this like a collection pause for the purposes of allocation | |
988 // since last pause. | |
989 double end_sec = os::elapsedTime(); | |
990 double full_gc_time_sec = end_sec - _cur_collection_start_sec; | |
991 double full_gc_time_ms = full_gc_time_sec * 1000.0; | |
992 | |
993 checkpoint_conc_overhead(); | |
994 | |
995 _all_full_gc_times_ms->add(full_gc_time_ms); | |
996 | |
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997 update_recent_gc_times(end_sec, full_gc_time_ms); |
342 | 998 |
999 _g1->clear_full_collection(); | |
1000 | |
1001 // "Nuke" the heuristics that control the fully/partially young GC | |
1002 // transitions and make sure we start with fully young GCs after the | |
1003 // Full GC. | |
1004 set_full_young_gcs(true); | |
1005 _last_full_young_gc = false; | |
1006 _should_revert_to_full_young_gcs = false; | |
1007 _should_initiate_conc_mark = false; | |
1008 _known_garbage_bytes = 0; | |
1009 _known_garbage_ratio = 0.0; | |
1010 _in_marking_window = false; | |
1011 _in_marking_window_im = false; | |
1012 | |
1013 _short_lived_surv_rate_group->record_scan_only_prefix(0); | |
1014 _short_lived_surv_rate_group->start_adding_regions(); | |
1015 // also call this on any additional surv rate groups | |
1016 | |
545 | 1017 record_survivor_regions(0, NULL, NULL); |
1018 | |
342 | 1019 _prev_region_num_young = _region_num_young; |
1020 _prev_region_num_tenured = _region_num_tenured; | |
1021 | |
1022 _free_regions_at_end_of_collection = _g1->free_regions(); | |
1023 _scan_only_regions_at_end_of_collection = 0; | |
545 | 1024 // Reset survivors SurvRateGroup. |
1025 _survivor_surv_rate_group->reset(); | |
342 | 1026 calculate_young_list_min_length(); |
1027 calculate_young_list_target_config(); | |
1028 } | |
1029 | |
1030 void G1CollectorPolicy::record_before_bytes(size_t bytes) { | |
1031 _bytes_in_to_space_before_gc += bytes; | |
1032 } | |
1033 | |
1034 void G1CollectorPolicy::record_after_bytes(size_t bytes) { | |
1035 _bytes_in_to_space_after_gc += bytes; | |
1036 } | |
1037 | |
1038 void G1CollectorPolicy::record_stop_world_start() { | |
1039 _stop_world_start = os::elapsedTime(); | |
1040 } | |
1041 | |
1042 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, | |
1043 size_t start_used) { | |
1044 if (PrintGCDetails) { | |
1045 gclog_or_tty->stamp(PrintGCTimeStamps); | |
1046 gclog_or_tty->print("[GC pause"); | |
1047 if (in_young_gc_mode()) | |
1048 gclog_or_tty->print(" (%s)", full_young_gcs() ? "young" : "partial"); | |
1049 } | |
1050 | |
1051 assert(_g1->used_regions() == _g1->recalculate_used_regions(), | |
1052 "sanity"); | |
636 | 1053 assert(_g1->used() == _g1->recalculate_used(), "sanity"); |
342 | 1054 |
1055 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
1056 _all_stop_world_times_ms->add(s_w_t_ms); | |
1057 _stop_world_start = 0.0; | |
1058 | |
1059 _cur_collection_start_sec = start_time_sec; | |
1060 _cur_collection_pause_used_at_start_bytes = start_used; | |
1061 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); | |
1062 _pending_cards = _g1->pending_card_num(); | |
1063 _max_pending_cards = _g1->max_pending_card_num(); | |
1064 | |
1065 _bytes_in_to_space_before_gc = 0; | |
1066 _bytes_in_to_space_after_gc = 0; | |
1067 _bytes_in_collection_set_before_gc = 0; | |
1068 | |
1069 #ifdef DEBUG | |
1070 // initialise these to something well known so that we can spot | |
1071 // if they are not set properly | |
1072 | |
1073 for (int i = 0; i < _parallel_gc_threads; ++i) { | |
1074 _par_last_ext_root_scan_times_ms[i] = -666.0; | |
1075 _par_last_mark_stack_scan_times_ms[i] = -666.0; | |
1076 _par_last_scan_only_times_ms[i] = -666.0; | |
1077 _par_last_scan_only_regions_scanned[i] = -666.0; | |
1078 _par_last_update_rs_start_times_ms[i] = -666.0; | |
1079 _par_last_update_rs_times_ms[i] = -666.0; | |
1080 _par_last_update_rs_processed_buffers[i] = -666.0; | |
1081 _par_last_scan_rs_start_times_ms[i] = -666.0; | |
1082 _par_last_scan_rs_times_ms[i] = -666.0; | |
1083 _par_last_scan_new_refs_times_ms[i] = -666.0; | |
1084 _par_last_obj_copy_times_ms[i] = -666.0; | |
1085 _par_last_termination_times_ms[i] = -666.0; | |
1086 } | |
1087 #endif | |
1088 | |
1089 for (int i = 0; i < _aux_num; ++i) { | |
1090 _cur_aux_times_ms[i] = 0.0; | |
1091 _cur_aux_times_set[i] = false; | |
1092 } | |
1093 | |
1094 _satb_drain_time_set = false; | |
1095 _last_satb_drain_processed_buffers = -1; | |
1096 | |
1097 if (in_young_gc_mode()) | |
1098 _last_young_gc_full = false; | |
1099 | |
1100 | |
1101 // do that for any other surv rate groups | |
1102 _short_lived_surv_rate_group->stop_adding_regions(); | |
1103 size_t short_lived_so_length = _young_list_so_prefix_length; | |
1104 _short_lived_surv_rate_group->record_scan_only_prefix(short_lived_so_length); | |
1105 tag_scan_only(short_lived_so_length); | |
1106 | |
751 | 1107 if (G1UseSurvivorSpaces) { |
545 | 1108 _survivors_age_table.clear(); |
1109 } | |
1110 | |
342 | 1111 assert( verify_young_ages(), "region age verification" ); |
1112 } | |
1113 | |
1114 void G1CollectorPolicy::tag_scan_only(size_t short_lived_scan_only_length) { | |
1115 // done in a way that it can be extended for other surv rate groups too... | |
1116 | |
1117 HeapRegion* head = _g1->young_list_first_region(); | |
1118 bool finished_short_lived = (short_lived_scan_only_length == 0); | |
1119 | |
1120 if (finished_short_lived) | |
1121 return; | |
1122 | |
1123 for (HeapRegion* curr = head; | |
1124 curr != NULL; | |
1125 curr = curr->get_next_young_region()) { | |
1126 SurvRateGroup* surv_rate_group = curr->surv_rate_group(); | |
1127 int age = curr->age_in_surv_rate_group(); | |
1128 | |
1129 if (surv_rate_group == _short_lived_surv_rate_group) { | |
1130 if ((size_t)age < short_lived_scan_only_length) | |
1131 curr->set_scan_only(); | |
1132 else | |
1133 finished_short_lived = true; | |
1134 } | |
1135 | |
1136 | |
1137 if (finished_short_lived) | |
1138 return; | |
1139 } | |
1140 | |
1141 guarantee( false, "we should never reach here" ); | |
1142 } | |
1143 | |
1144 void G1CollectorPolicy::record_mark_closure_time(double mark_closure_time_ms) { | |
1145 _mark_closure_time_ms = mark_closure_time_ms; | |
1146 } | |
1147 | |
1148 void G1CollectorPolicy::record_concurrent_mark_init_start() { | |
1149 _mark_init_start_sec = os::elapsedTime(); | |
1150 guarantee(!in_young_gc_mode(), "should not do be here in young GC mode"); | |
1151 } | |
1152 | |
1153 void G1CollectorPolicy::record_concurrent_mark_init_end_pre(double | |
1154 mark_init_elapsed_time_ms) { | |
1155 _during_marking = true; | |
1156 _should_initiate_conc_mark = false; | |
1157 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; | |
1158 } | |
1159 | |
1160 void G1CollectorPolicy::record_concurrent_mark_init_end() { | |
1161 double end_time_sec = os::elapsedTime(); | |
1162 double elapsed_time_ms = (end_time_sec - _mark_init_start_sec) * 1000.0; | |
1163 _concurrent_mark_init_times_ms->add(elapsed_time_ms); | |
1164 checkpoint_conc_overhead(); | |
1165 record_concurrent_mark_init_end_pre(elapsed_time_ms); | |
1166 | |
1167 _mmu_tracker->add_pause(_mark_init_start_sec, end_time_sec, true); | |
1168 } | |
1169 | |
1170 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
1171 _mark_remark_start_sec = os::elapsedTime(); | |
1172 _during_marking = false; | |
1173 } | |
1174 | |
1175 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
1176 double end_time_sec = os::elapsedTime(); | |
1177 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
1178 checkpoint_conc_overhead(); | |
1179 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
1180 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
1181 _prev_collection_pause_end_ms += elapsed_time_ms; | |
1182 | |
1183 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
1184 } | |
1185 | |
1186 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
1187 _mark_cleanup_start_sec = os::elapsedTime(); | |
1188 } | |
1189 | |
1190 void | |
1191 G1CollectorPolicy::record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
1192 size_t max_live_bytes) { | |
1193 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
1194 record_concurrent_mark_cleanup_end_work2(); | |
1195 } | |
1196 | |
1197 void | |
1198 G1CollectorPolicy:: | |
1199 record_concurrent_mark_cleanup_end_work1(size_t freed_bytes, | |
1200 size_t max_live_bytes) { | |
1201 if (_n_marks < 2) _n_marks++; | |
1202 if (G1PolicyVerbose > 0) | |
1203 gclog_or_tty->print_cr("At end of marking, max_live is " SIZE_FORMAT " MB " | |
1204 " (of " SIZE_FORMAT " MB heap).", | |
1205 max_live_bytes/M, _g1->capacity()/M); | |
1206 } | |
1207 | |
1208 // The important thing about this is that it includes "os::elapsedTime". | |
1209 void G1CollectorPolicy::record_concurrent_mark_cleanup_end_work2() { | |
1210 checkpoint_conc_overhead(); | |
1211 double end_time_sec = os::elapsedTime(); | |
1212 double elapsed_time_ms = (end_time_sec - _mark_cleanup_start_sec)*1000.0; | |
1213 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
1214 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
1215 _prev_collection_pause_end_ms += elapsed_time_ms; | |
1216 | |
1217 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_time_sec, true); | |
1218 | |
1219 _num_markings++; | |
1220 | |
1221 // We did a marking, so reset the "since_last_mark" variables. | |
1222 double considerConcMarkCost = 1.0; | |
1223 // If there are available processors, concurrent activity is free... | |
1224 if (Threads::number_of_non_daemon_threads() * 2 < | |
1225 os::active_processor_count()) { | |
1226 considerConcMarkCost = 0.0; | |
1227 } | |
1228 _n_pauses_at_mark_end = _n_pauses; | |
1229 _n_marks_since_last_pause++; | |
1230 _conc_mark_initiated = false; | |
1231 } | |
1232 | |
1233 void | |
1234 G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { | |
1235 if (in_young_gc_mode()) { | |
1236 _should_revert_to_full_young_gcs = false; | |
1237 _last_full_young_gc = true; | |
1238 _in_marking_window = false; | |
1239 if (adaptive_young_list_length()) | |
1240 calculate_young_list_target_config(); | |
1241 } | |
1242 } | |
1243 | |
1244 void G1CollectorPolicy::record_concurrent_pause() { | |
1245 if (_stop_world_start > 0.0) { | |
1246 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
1247 _all_yield_times_ms->add(yield_ms); | |
1248 } | |
1249 } | |
1250 | |
1251 void G1CollectorPolicy::record_concurrent_pause_end() { | |
1252 } | |
1253 | |
1254 void G1CollectorPolicy::record_collection_pause_end_CH_strong_roots() { | |
1255 _cur_CH_strong_roots_end_sec = os::elapsedTime(); | |
1256 _cur_CH_strong_roots_dur_ms = | |
1257 (_cur_CH_strong_roots_end_sec - _cur_collection_start_sec) * 1000.0; | |
1258 } | |
1259 | |
1260 void G1CollectorPolicy::record_collection_pause_end_G1_strong_roots() { | |
1261 _cur_G1_strong_roots_end_sec = os::elapsedTime(); | |
1262 _cur_G1_strong_roots_dur_ms = | |
1263 (_cur_G1_strong_roots_end_sec - _cur_CH_strong_roots_end_sec) * 1000.0; | |
1264 } | |
1265 | |
1266 template<class T> | |
1267 T sum_of(T* sum_arr, int start, int n, int N) { | |
1268 T sum = (T)0; | |
1269 for (int i = 0; i < n; i++) { | |
1270 int j = (start + i) % N; | |
1271 sum += sum_arr[j]; | |
1272 } | |
1273 return sum; | |
1274 } | |
1275 | |
1276 void G1CollectorPolicy::print_par_stats (int level, | |
1277 const char* str, | |
1278 double* data, | |
1279 bool summary) { | |
1280 double min = data[0], max = data[0]; | |
1281 double total = 0.0; | |
1282 int j; | |
1283 for (j = 0; j < level; ++j) | |
1284 gclog_or_tty->print(" "); | |
1285 gclog_or_tty->print("[%s (ms):", str); | |
1286 for (uint i = 0; i < ParallelGCThreads; ++i) { | |
1287 double val = data[i]; | |
1288 if (val < min) | |
1289 min = val; | |
1290 if (val > max) | |
1291 max = val; | |
1292 total += val; | |
1293 gclog_or_tty->print(" %3.1lf", val); | |
1294 } | |
1295 if (summary) { | |
1296 gclog_or_tty->print_cr(""); | |
1297 double avg = total / (double) ParallelGCThreads; | |
1298 gclog_or_tty->print(" "); | |
1299 for (j = 0; j < level; ++j) | |
1300 gclog_or_tty->print(" "); | |
1301 gclog_or_tty->print("Avg: %5.1lf, Min: %5.1lf, Max: %5.1lf", | |
1302 avg, min, max); | |
1303 } | |
1304 gclog_or_tty->print_cr("]"); | |
1305 } | |
1306 | |
1307 void G1CollectorPolicy::print_par_buffers (int level, | |
1308 const char* str, | |
1309 double* data, | |
1310 bool summary) { | |
1311 double min = data[0], max = data[0]; | |
1312 double total = 0.0; | |
1313 int j; | |
1314 for (j = 0; j < level; ++j) | |
1315 gclog_or_tty->print(" "); | |
1316 gclog_or_tty->print("[%s :", str); | |
1317 for (uint i = 0; i < ParallelGCThreads; ++i) { | |
1318 double val = data[i]; | |
1319 if (val < min) | |
1320 min = val; | |
1321 if (val > max) | |
1322 max = val; | |
1323 total += val; | |
1324 gclog_or_tty->print(" %d", (int) val); | |
1325 } | |
1326 if (summary) { | |
1327 gclog_or_tty->print_cr(""); | |
1328 double avg = total / (double) ParallelGCThreads; | |
1329 gclog_or_tty->print(" "); | |
1330 for (j = 0; j < level; ++j) | |
1331 gclog_or_tty->print(" "); | |
1332 gclog_or_tty->print("Sum: %d, Avg: %d, Min: %d, Max: %d", | |
1333 (int)total, (int)avg, (int)min, (int)max); | |
1334 } | |
1335 gclog_or_tty->print_cr("]"); | |
1336 } | |
1337 | |
1338 void G1CollectorPolicy::print_stats (int level, | |
1339 const char* str, | |
1340 double value) { | |
1341 for (int j = 0; j < level; ++j) | |
1342 gclog_or_tty->print(" "); | |
1343 gclog_or_tty->print_cr("[%s: %5.1lf ms]", str, value); | |
1344 } | |
1345 | |
1346 void G1CollectorPolicy::print_stats (int level, | |
1347 const char* str, | |
1348 int value) { | |
1349 for (int j = 0; j < level; ++j) | |
1350 gclog_or_tty->print(" "); | |
1351 gclog_or_tty->print_cr("[%s: %d]", str, value); | |
1352 } | |
1353 | |
1354 double G1CollectorPolicy::avg_value (double* data) { | |
1355 if (ParallelGCThreads > 0) { | |
1356 double ret = 0.0; | |
1357 for (uint i = 0; i < ParallelGCThreads; ++i) | |
1358 ret += data[i]; | |
1359 return ret / (double) ParallelGCThreads; | |
1360 } else { | |
1361 return data[0]; | |
1362 } | |
1363 } | |
1364 | |
1365 double G1CollectorPolicy::max_value (double* data) { | |
1366 if (ParallelGCThreads > 0) { | |
1367 double ret = data[0]; | |
1368 for (uint i = 1; i < ParallelGCThreads; ++i) | |
1369 if (data[i] > ret) | |
1370 ret = data[i]; | |
1371 return ret; | |
1372 } else { | |
1373 return data[0]; | |
1374 } | |
1375 } | |
1376 | |
1377 double G1CollectorPolicy::sum_of_values (double* data) { | |
1378 if (ParallelGCThreads > 0) { | |
1379 double sum = 0.0; | |
1380 for (uint i = 0; i < ParallelGCThreads; i++) | |
1381 sum += data[i]; | |
1382 return sum; | |
1383 } else { | |
1384 return data[0]; | |
1385 } | |
1386 } | |
1387 | |
1388 double G1CollectorPolicy::max_sum (double* data1, | |
1389 double* data2) { | |
1390 double ret = data1[0] + data2[0]; | |
1391 | |
1392 if (ParallelGCThreads > 0) { | |
1393 for (uint i = 1; i < ParallelGCThreads; ++i) { | |
1394 double data = data1[i] + data2[i]; | |
1395 if (data > ret) | |
1396 ret = data; | |
1397 } | |
1398 } | |
1399 return ret; | |
1400 } | |
1401 | |
1402 // Anything below that is considered to be zero | |
1403 #define MIN_TIMER_GRANULARITY 0.0000001 | |
1404 | |
677 | 1405 void G1CollectorPolicy::record_collection_pause_end(bool abandoned) { |
342 | 1406 double end_time_sec = os::elapsedTime(); |
1407 double elapsed_ms = _last_pause_time_ms; | |
1408 bool parallel = ParallelGCThreads > 0; | |
1409 double evac_ms = (end_time_sec - _cur_G1_strong_roots_end_sec) * 1000.0; | |
1410 size_t rs_size = | |
1411 _cur_collection_pause_used_regions_at_start - collection_set_size(); | |
1412 size_t cur_used_bytes = _g1->used(); | |
1413 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
1414 bool last_pause_included_initial_mark = false; | |
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1415 bool update_stats = !abandoned && !_g1->evacuation_failed(); |
342 | 1416 |
1417 #ifndef PRODUCT | |
1418 if (G1YoungSurvRateVerbose) { | |
1419 gclog_or_tty->print_cr(""); | |
1420 _short_lived_surv_rate_group->print(); | |
1421 // do that for any other surv rate groups too | |
1422 } | |
1423 #endif // PRODUCT | |
1424 | |
1425 checkpoint_conc_overhead(); | |
1426 | |
1427 if (in_young_gc_mode()) { | |
1428 last_pause_included_initial_mark = _should_initiate_conc_mark; | |
1429 if (last_pause_included_initial_mark) | |
1430 record_concurrent_mark_init_end_pre(0.0); | |
1431 | |
1432 size_t min_used_targ = | |
1433 (_g1->capacity() / 100) * (G1SteadyStateUsed - G1SteadyStateUsedDelta); | |
1434 | |
1435 if (cur_used_bytes > min_used_targ) { | |
1436 if (cur_used_bytes <= _prev_collection_pause_used_at_end_bytes) { | |
1437 } else if (!_g1->mark_in_progress() && !_last_full_young_gc) { | |
1438 _should_initiate_conc_mark = true; | |
1439 } | |
1440 } | |
1441 | |
1442 _prev_collection_pause_used_at_end_bytes = cur_used_bytes; | |
1443 } | |
1444 | |
1445 _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0, | |
1446 end_time_sec, false); | |
1447 | |
1448 guarantee(_cur_collection_pause_used_regions_at_start >= | |
1449 collection_set_size(), | |
1450 "Negative RS size?"); | |
1451 | |
1452 // This assert is exempted when we're doing parallel collection pauses, | |
1453 // because the fragmentation caused by the parallel GC allocation buffers | |
1454 // can lead to more memory being used during collection than was used | |
1455 // before. Best leave this out until the fragmentation problem is fixed. | |
1456 // Pauses in which evacuation failed can also lead to negative | |
1457 // collections, since no space is reclaimed from a region containing an | |
1458 // object whose evacuation failed. | |
1459 // Further, we're now always doing parallel collection. But I'm still | |
1460 // leaving this here as a placeholder for a more precise assertion later. | |
1461 // (DLD, 10/05.) | |
1462 assert((true || parallel) // Always using GC LABs now. | |
1463 || _g1->evacuation_failed() | |
1464 || _cur_collection_pause_used_at_start_bytes >= cur_used_bytes, | |
1465 "Negative collection"); | |
1466 | |
1467 size_t freed_bytes = | |
1468 _cur_collection_pause_used_at_start_bytes - cur_used_bytes; | |
1469 size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; | |
1470 double survival_fraction = | |
1471 (double)surviving_bytes/ | |
1472 (double)_collection_set_bytes_used_before; | |
1473 | |
1474 _n_pauses++; | |
1475 | |
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diff
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1476 if (update_stats) { |
342 | 1477 _recent_CH_strong_roots_times_ms->add(_cur_CH_strong_roots_dur_ms); |
1478 _recent_G1_strong_roots_times_ms->add(_cur_G1_strong_roots_dur_ms); | |
1479 _recent_evac_times_ms->add(evac_ms); | |
1480 _recent_pause_times_ms->add(elapsed_ms); | |
1481 | |
1482 _recent_rs_sizes->add(rs_size); | |
1483 | |
1484 // We exempt parallel collection from this check because Alloc Buffer | |
1485 // fragmentation can produce negative collections. Same with evac | |
1486 // failure. | |
1487 // Further, we're now always doing parallel collection. But I'm still | |
1488 // leaving this here as a placeholder for a more precise assertion later. | |
1489 // (DLD, 10/05. | |
1490 assert((true || parallel) | |
1491 || _g1->evacuation_failed() | |
1492 || surviving_bytes <= _collection_set_bytes_used_before, | |
1493 "Or else negative collection!"); | |
1494 _recent_CS_bytes_used_before->add(_collection_set_bytes_used_before); | |
1495 _recent_CS_bytes_surviving->add(surviving_bytes); | |
1496 | |
1497 // this is where we update the allocation rate of the application | |
1498 double app_time_ms = | |
1499 (_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms); | |
1500 if (app_time_ms < MIN_TIMER_GRANULARITY) { | |
1501 // This usually happens due to the timer not having the required | |
1502 // granularity. Some Linuxes are the usual culprits. | |
1503 // We'll just set it to something (arbitrarily) small. | |
1504 app_time_ms = 1.0; | |
1505 } | |
1506 size_t regions_allocated = | |
1507 (_region_num_young - _prev_region_num_young) + | |
1508 (_region_num_tenured - _prev_region_num_tenured); | |
1509 double alloc_rate_ms = (double) regions_allocated / app_time_ms; | |
1510 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
1511 _prev_region_num_young = _region_num_young; | |
1512 _prev_region_num_tenured = _region_num_tenured; | |
1513 | |
1514 double interval_ms = | |
1515 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
1516 update_recent_gc_times(end_time_sec, elapsed_ms); | |
1517 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; | |
1518 assert(recent_avg_pause_time_ratio() < 1.00, "All GC?"); | |
1519 } | |
1520 | |
1521 if (G1PolicyVerbose > 1) { | |
1522 gclog_or_tty->print_cr(" Recording collection pause(%d)", _n_pauses); | |
1523 } | |
1524 | |
1525 PauseSummary* summary; | |
677 | 1526 if (abandoned) { |
1527 summary = _abandoned_summary; | |
1528 } else { | |
1529 summary = _summary; | |
342 | 1530 } |
1531 | |
1532 double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); | |
1533 double mark_stack_scan_time = avg_value(_par_last_mark_stack_scan_times_ms); | |
1534 double scan_only_time = avg_value(_par_last_scan_only_times_ms); | |
1535 double scan_only_regions_scanned = | |
1536 sum_of_values(_par_last_scan_only_regions_scanned); | |
1537 double update_rs_time = avg_value(_par_last_update_rs_times_ms); | |
1538 double update_rs_processed_buffers = | |
1539 sum_of_values(_par_last_update_rs_processed_buffers); | |
1540 double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); | |
1541 double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); | |
1542 double termination_time = avg_value(_par_last_termination_times_ms); | |
1543 | |
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1544 double parallel_other_time = _cur_collection_par_time_ms - |
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1545 (update_rs_time + ext_root_scan_time + mark_stack_scan_time + |
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1546 scan_only_time + scan_rs_time + obj_copy_time + termination_time); |
595
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1547 if (update_stats) { |
342 | 1548 MainBodySummary* body_summary = summary->main_body_summary(); |
1549 guarantee(body_summary != NULL, "should not be null!"); | |
1550 | |
1551 if (_satb_drain_time_set) | |
1552 body_summary->record_satb_drain_time_ms(_cur_satb_drain_time_ms); | |
1553 else | |
1554 body_summary->record_satb_drain_time_ms(0.0); | |
1555 body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); | |
1556 body_summary->record_mark_stack_scan_time_ms(mark_stack_scan_time); | |
1557 body_summary->record_scan_only_time_ms(scan_only_time); | |
1558 body_summary->record_update_rs_time_ms(update_rs_time); | |
1559 body_summary->record_scan_rs_time_ms(scan_rs_time); | |
1560 body_summary->record_obj_copy_time_ms(obj_copy_time); | |
1561 if (parallel) { | |
1562 body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); | |
1563 body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); | |
1564 body_summary->record_termination_time_ms(termination_time); | |
1565 body_summary->record_parallel_other_time_ms(parallel_other_time); | |
1566 } | |
1567 body_summary->record_mark_closure_time_ms(_mark_closure_time_ms); | |
1568 } | |
1569 | |
1570 if (G1PolicyVerbose > 1) { | |
1571 gclog_or_tty->print_cr(" ET: %10.6f ms (avg: %10.6f ms)\n" | |
1572 " CH Strong: %10.6f ms (avg: %10.6f ms)\n" | |
1573 " G1 Strong: %10.6f ms (avg: %10.6f ms)\n" | |
1574 " Evac: %10.6f ms (avg: %10.6f ms)\n" | |
1575 " ET-RS: %10.6f ms (avg: %10.6f ms)\n" | |
1576 " |RS|: " SIZE_FORMAT, | |
1577 elapsed_ms, recent_avg_time_for_pauses_ms(), | |
1578 _cur_CH_strong_roots_dur_ms, recent_avg_time_for_CH_strong_ms(), | |
1579 _cur_G1_strong_roots_dur_ms, recent_avg_time_for_G1_strong_ms(), | |
1580 evac_ms, recent_avg_time_for_evac_ms(), | |
1581 scan_rs_time, | |
1582 recent_avg_time_for_pauses_ms() - | |
1583 recent_avg_time_for_G1_strong_ms(), | |
1584 rs_size); | |
1585 | |
1586 gclog_or_tty->print_cr(" Used at start: " SIZE_FORMAT"K" | |
1587 " At end " SIZE_FORMAT "K\n" | |
1588 " garbage : " SIZE_FORMAT "K" | |
1589 " of " SIZE_FORMAT "K\n" | |
1590 " survival : %6.2f%% (%6.2f%% avg)", | |
1591 _cur_collection_pause_used_at_start_bytes/K, | |
1592 _g1->used()/K, freed_bytes/K, | |
1593 _collection_set_bytes_used_before/K, | |
1594 survival_fraction*100.0, | |
1595 recent_avg_survival_fraction()*100.0); | |
1596 gclog_or_tty->print_cr(" Recent %% gc pause time: %6.2f", | |
1597 recent_avg_pause_time_ratio() * 100.0); | |
1598 } | |
1599 | |
1600 double other_time_ms = elapsed_ms; | |
1601 | |
1602 if (!abandoned) { | |
1603 if (_satb_drain_time_set) | |
1604 other_time_ms -= _cur_satb_drain_time_ms; | |
1605 | |
1606 if (parallel) | |
1607 other_time_ms -= _cur_collection_par_time_ms + _cur_clear_ct_time_ms; | |
1608 else | |
1609 other_time_ms -= | |
1610 update_rs_time + | |
1611 ext_root_scan_time + mark_stack_scan_time + scan_only_time + | |
1612 scan_rs_time + obj_copy_time; | |
1613 } | |
1614 | |
1615 if (PrintGCDetails) { | |
1616 gclog_or_tty->print_cr("%s%s, %1.8lf secs]", | |
677 | 1617 abandoned ? " (abandoned)" : "", |
342 | 1618 (last_pause_included_initial_mark) ? " (initial-mark)" : "", |
1619 elapsed_ms / 1000.0); | |
1620 | |
1621 if (!abandoned) { | |
677 | 1622 if (_satb_drain_time_set) { |
342 | 1623 print_stats(1, "SATB Drain Time", _cur_satb_drain_time_ms); |
677 | 1624 } |
1625 if (_last_satb_drain_processed_buffers >= 0) { | |
342 | 1626 print_stats(2, "Processed Buffers", _last_satb_drain_processed_buffers); |
677 | 1627 } |
1628 if (parallel) { | |
1629 print_stats(1, "Parallel Time", _cur_collection_par_time_ms); | |
1630 print_par_stats(2, "Update RS (Start)", _par_last_update_rs_start_times_ms, false); | |
1631 print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); | |
794 | 1632 print_par_buffers(3, "Processed Buffers", |
1633 _par_last_update_rs_processed_buffers, true); | |
342 | 1634 print_par_stats(2, "Ext Root Scanning", _par_last_ext_root_scan_times_ms); |
1635 print_par_stats(2, "Mark Stack Scanning", _par_last_mark_stack_scan_times_ms); | |
1636 print_par_stats(2, "Scan-Only Scanning", _par_last_scan_only_times_ms); | |
1637 print_par_buffers(3, "Scan-Only Regions", | |
1638 _par_last_scan_only_regions_scanned, true); | |
1639 print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms); | |
1640 print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms); | |
1641 print_par_stats(2, "Termination", _par_last_termination_times_ms); | |
1642 print_stats(2, "Other", parallel_other_time); | |
1643 print_stats(1, "Clear CT", _cur_clear_ct_time_ms); | |
677 | 1644 } else { |
1645 print_stats(1, "Update RS", update_rs_time); | |
794 | 1646 print_stats(2, "Processed Buffers", |
1647 (int)update_rs_processed_buffers); | |
342 | 1648 print_stats(1, "Ext Root Scanning", ext_root_scan_time); |
1649 print_stats(1, "Mark Stack Scanning", mark_stack_scan_time); | |
1650 print_stats(1, "Scan-Only Scanning", scan_only_time); | |
1651 print_stats(1, "Scan RS", scan_rs_time); | |
1652 print_stats(1, "Object Copying", obj_copy_time); | |
1653 } | |
1654 } | |
1655 print_stats(1, "Other", other_time_ms); | |
1656 for (int i = 0; i < _aux_num; ++i) { | |
1657 if (_cur_aux_times_set[i]) { | |
1658 char buffer[96]; | |
1659 sprintf(buffer, "Aux%d", i); | |
1660 print_stats(1, buffer, _cur_aux_times_ms[i]); | |
1661 } | |
1662 } | |
1663 } | |
1664 if (PrintGCDetails) | |
1665 gclog_or_tty->print(" ["); | |
1666 if (PrintGC || PrintGCDetails) | |
1667 _g1->print_size_transition(gclog_or_tty, | |
1668 _cur_collection_pause_used_at_start_bytes, | |
1669 _g1->used(), _g1->capacity()); | |
1670 if (PrintGCDetails) | |
1671 gclog_or_tty->print_cr("]"); | |
1672 | |
1673 _all_pause_times_ms->add(elapsed_ms); | |
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1674 if (update_stats) { |
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1675 summary->record_total_time_ms(elapsed_ms); |
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1676 summary->record_other_time_ms(other_time_ms); |
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1677 } |
342 | 1678 for (int i = 0; i < _aux_num; ++i) |
1679 if (_cur_aux_times_set[i]) | |
1680 _all_aux_times_ms[i].add(_cur_aux_times_ms[i]); | |
1681 | |
1682 // Reset marks-between-pauses counter. | |
1683 _n_marks_since_last_pause = 0; | |
1684 | |
1685 // Update the efficiency-since-mark vars. | |
1686 double proc_ms = elapsed_ms * (double) _parallel_gc_threads; | |
1687 if (elapsed_ms < MIN_TIMER_GRANULARITY) { | |
1688 // This usually happens due to the timer not having the required | |
1689 // granularity. Some Linuxes are the usual culprits. | |
1690 // We'll just set it to something (arbitrarily) small. | |
1691 proc_ms = 1.0; | |
1692 } | |
1693 double cur_efficiency = (double) freed_bytes / proc_ms; | |
1694 | |
1695 bool new_in_marking_window = _in_marking_window; | |
1696 bool new_in_marking_window_im = false; | |
1697 if (_should_initiate_conc_mark) { | |
1698 new_in_marking_window = true; | |
1699 new_in_marking_window_im = true; | |
1700 } | |
1701 | |
1702 if (in_young_gc_mode()) { | |
1703 if (_last_full_young_gc) { | |
1704 set_full_young_gcs(false); | |
1705 _last_full_young_gc = false; | |
1706 } | |
1707 | |
1708 if ( !_last_young_gc_full ) { | |
1709 if ( _should_revert_to_full_young_gcs || | |
1710 _known_garbage_ratio < 0.05 || | |
1711 (adaptive_young_list_length() && | |
1712 (get_gc_eff_factor() * cur_efficiency < predict_young_gc_eff())) ) { | |
1713 set_full_young_gcs(true); | |
1714 } | |
1715 } | |
1716 _should_revert_to_full_young_gcs = false; | |
1717 | |
1718 if (_last_young_gc_full && !_during_marking) | |
1719 _young_gc_eff_seq->add(cur_efficiency); | |
1720 } | |
1721 | |
1722 _short_lived_surv_rate_group->start_adding_regions(); | |
1723 // do that for any other surv rate groupsx | |
1724 | |
1725 // <NEW PREDICTION> | |
1726 | |
677 | 1727 if (update_stats) { |
342 | 1728 double pause_time_ms = elapsed_ms; |
1729 | |
1730 size_t diff = 0; | |
1731 if (_max_pending_cards >= _pending_cards) | |
1732 diff = _max_pending_cards - _pending_cards; | |
1733 _pending_card_diff_seq->add((double) diff); | |
1734 | |
1735 double cost_per_card_ms = 0.0; | |
1736 if (_pending_cards > 0) { | |
1737 cost_per_card_ms = update_rs_time / (double) _pending_cards; | |
1738 _cost_per_card_ms_seq->add(cost_per_card_ms); | |
1739 } | |
1740 | |
1741 double cost_per_scan_only_region_ms = 0.0; | |
1742 if (scan_only_regions_scanned > 0.0) { | |
1743 cost_per_scan_only_region_ms = | |
1744 scan_only_time / scan_only_regions_scanned; | |
1745 if (_in_marking_window_im) | |
1746 _cost_per_scan_only_region_ms_during_cm_seq->add(cost_per_scan_only_region_ms); | |
1747 else | |
1748 _cost_per_scan_only_region_ms_seq->add(cost_per_scan_only_region_ms); | |
1749 } | |
1750 | |
1751 size_t cards_scanned = _g1->cards_scanned(); | |
1752 | |
1753 double cost_per_entry_ms = 0.0; | |
1754 if (cards_scanned > 10) { | |
1755 cost_per_entry_ms = scan_rs_time / (double) cards_scanned; | |
1756 if (_last_young_gc_full) | |
1757 _cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1758 else | |
1759 _partially_young_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1760 } | |
1761 | |
1762 if (_max_rs_lengths > 0) { | |
1763 double cards_per_entry_ratio = | |
1764 (double) cards_scanned / (double) _max_rs_lengths; | |
1765 if (_last_young_gc_full) | |
1766 _fully_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1767 else | |
1768 _partially_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1769 } | |
1770 | |
1771 size_t rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; | |
1772 if (rs_length_diff >= 0) | |
1773 _rs_length_diff_seq->add((double) rs_length_diff); | |
1774 | |
1775 size_t copied_bytes = surviving_bytes; | |
1776 double cost_per_byte_ms = 0.0; | |
1777 if (copied_bytes > 0) { | |
1778 cost_per_byte_ms = obj_copy_time / (double) copied_bytes; | |
1779 if (_in_marking_window) | |
1780 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); | |
1781 else | |
1782 _cost_per_byte_ms_seq->add(cost_per_byte_ms); | |
1783 } | |
1784 | |
1785 double all_other_time_ms = pause_time_ms - | |
1786 (update_rs_time + scan_only_time + scan_rs_time + obj_copy_time + | |
1787 _mark_closure_time_ms + termination_time); | |
1788 | |
1789 double young_other_time_ms = 0.0; | |
1790 if (_recorded_young_regions > 0) { | |
1791 young_other_time_ms = | |
1792 _recorded_young_cset_choice_time_ms + | |
1793 _recorded_young_free_cset_time_ms; | |
1794 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / | |
1795 (double) _recorded_young_regions); | |
1796 } | |
1797 double non_young_other_time_ms = 0.0; | |
1798 if (_recorded_non_young_regions > 0) { | |
1799 non_young_other_time_ms = | |
1800 _recorded_non_young_cset_choice_time_ms + | |
1801 _recorded_non_young_free_cset_time_ms; | |
1802 | |
1803 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
1804 (double) _recorded_non_young_regions); | |
1805 } | |
1806 | |
1807 double constant_other_time_ms = all_other_time_ms - | |
1808 (young_other_time_ms + non_young_other_time_ms); | |
1809 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
1810 | |
1811 double survival_ratio = 0.0; | |
1812 if (_bytes_in_collection_set_before_gc > 0) { | |
1813 survival_ratio = (double) bytes_in_to_space_during_gc() / | |
1814 (double) _bytes_in_collection_set_before_gc; | |
1815 } | |
1816 | |
1817 _pending_cards_seq->add((double) _pending_cards); | |
1818 _scanned_cards_seq->add((double) cards_scanned); | |
1819 _rs_lengths_seq->add((double) _max_rs_lengths); | |
1820 | |
1821 double expensive_region_limit_ms = | |
751 | 1822 (double) MaxGCPauseMillis - predict_constant_other_time_ms(); |
342 | 1823 if (expensive_region_limit_ms < 0.0) { |
1824 // this means that the other time was predicted to be longer than | |
1825 // than the max pause time | |
751 | 1826 expensive_region_limit_ms = (double) MaxGCPauseMillis; |
342 | 1827 } |
1828 _expensive_region_limit_ms = expensive_region_limit_ms; | |
1829 | |
1830 if (PREDICTIONS_VERBOSE) { | |
1831 gclog_or_tty->print_cr(""); | |
1832 gclog_or_tty->print_cr("PREDICTIONS %1.4lf %d " | |
1833 "REGIONS %d %d %d %d " | |
1834 "PENDING_CARDS %d %d " | |
1835 "CARDS_SCANNED %d %d " | |
1836 "RS_LENGTHS %d %d " | |
1837 "SCAN_ONLY_SCAN %1.6lf %1.6lf " | |
1838 "RS_UPDATE %1.6lf %1.6lf RS_SCAN %1.6lf %1.6lf " | |
1839 "SURVIVAL_RATIO %1.6lf %1.6lf " | |
1840 "OBJECT_COPY %1.6lf %1.6lf OTHER_CONSTANT %1.6lf %1.6lf " | |
1841 "OTHER_YOUNG %1.6lf %1.6lf " | |
1842 "OTHER_NON_YOUNG %1.6lf %1.6lf " | |
1843 "VTIME_DIFF %1.6lf TERMINATION %1.6lf " | |
1844 "ELAPSED %1.6lf %1.6lf ", | |
1845 _cur_collection_start_sec, | |
1846 (!_last_young_gc_full) ? 2 : | |
1847 (last_pause_included_initial_mark) ? 1 : 0, | |
1848 _recorded_region_num, | |
1849 _recorded_young_regions, | |
1850 _recorded_scan_only_regions, | |
1851 _recorded_non_young_regions, | |
1852 _predicted_pending_cards, _pending_cards, | |
1853 _predicted_cards_scanned, cards_scanned, | |
1854 _predicted_rs_lengths, _max_rs_lengths, | |
1855 _predicted_scan_only_scan_time_ms, scan_only_time, | |
1856 _predicted_rs_update_time_ms, update_rs_time, | |
1857 _predicted_rs_scan_time_ms, scan_rs_time, | |
1858 _predicted_survival_ratio, survival_ratio, | |
1859 _predicted_object_copy_time_ms, obj_copy_time, | |
1860 _predicted_constant_other_time_ms, constant_other_time_ms, | |
1861 _predicted_young_other_time_ms, young_other_time_ms, | |
1862 _predicted_non_young_other_time_ms, | |
1863 non_young_other_time_ms, | |
1864 _vtime_diff_ms, termination_time, | |
1865 _predicted_pause_time_ms, elapsed_ms); | |
1866 } | |
1867 | |
1868 if (G1PolicyVerbose > 0) { | |
1869 gclog_or_tty->print_cr("Pause Time, predicted: %1.4lfms (predicted %s), actual: %1.4lfms", | |
1870 _predicted_pause_time_ms, | |
1871 (_within_target) ? "within" : "outside", | |
1872 elapsed_ms); | |
1873 } | |
1874 | |
1875 } | |
1876 | |
1877 _in_marking_window = new_in_marking_window; | |
1878 _in_marking_window_im = new_in_marking_window_im; | |
1879 _free_regions_at_end_of_collection = _g1->free_regions(); | |
1880 _scan_only_regions_at_end_of_collection = _g1->young_list_length(); | |
1881 calculate_young_list_min_length(); | |
1882 calculate_young_list_target_config(); | |
1883 | |
1884 // </NEW PREDICTION> | |
1885 | |
1886 _target_pause_time_ms = -1.0; | |
1887 } | |
1888 | |
1889 // <NEW PREDICTION> | |
1890 | |
1891 double | |
1892 G1CollectorPolicy:: | |
1893 predict_young_collection_elapsed_time_ms(size_t adjustment) { | |
1894 guarantee( adjustment == 0 || adjustment == 1, "invariant" ); | |
1895 | |
1896 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1897 size_t young_num = g1h->young_list_length(); | |
1898 if (young_num == 0) | |
1899 return 0.0; | |
1900 | |
1901 young_num += adjustment; | |
1902 size_t pending_cards = predict_pending_cards(); | |
1903 size_t rs_lengths = g1h->young_list_sampled_rs_lengths() + | |
1904 predict_rs_length_diff(); | |
1905 size_t card_num; | |
1906 if (full_young_gcs()) | |
1907 card_num = predict_young_card_num(rs_lengths); | |
1908 else | |
1909 card_num = predict_non_young_card_num(rs_lengths); | |
1910 size_t young_byte_size = young_num * HeapRegion::GrainBytes; | |
1911 double accum_yg_surv_rate = | |
1912 _short_lived_surv_rate_group->accum_surv_rate(adjustment); | |
1913 | |
1914 size_t bytes_to_copy = | |
1915 (size_t) (accum_yg_surv_rate * (double) HeapRegion::GrainBytes); | |
1916 | |
1917 return | |
1918 predict_rs_update_time_ms(pending_cards) + | |
1919 predict_rs_scan_time_ms(card_num) + | |
1920 predict_object_copy_time_ms(bytes_to_copy) + | |
1921 predict_young_other_time_ms(young_num) + | |
1922 predict_constant_other_time_ms(); | |
1923 } | |
1924 | |
1925 double | |
1926 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { | |
1927 size_t rs_length = predict_rs_length_diff(); | |
1928 size_t card_num; | |
1929 if (full_young_gcs()) | |
1930 card_num = predict_young_card_num(rs_length); | |
1931 else | |
1932 card_num = predict_non_young_card_num(rs_length); | |
1933 return predict_base_elapsed_time_ms(pending_cards, card_num); | |
1934 } | |
1935 | |
1936 double | |
1937 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
1938 size_t scanned_cards) { | |
1939 return | |
1940 predict_rs_update_time_ms(pending_cards) + | |
1941 predict_rs_scan_time_ms(scanned_cards) + | |
1942 predict_constant_other_time_ms(); | |
1943 } | |
1944 | |
1945 double | |
1946 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
1947 bool young) { | |
1948 size_t rs_length = hr->rem_set()->occupied(); | |
1949 size_t card_num; | |
1950 if (full_young_gcs()) | |
1951 card_num = predict_young_card_num(rs_length); | |
1952 else | |
1953 card_num = predict_non_young_card_num(rs_length); | |
1954 size_t bytes_to_copy = predict_bytes_to_copy(hr); | |
1955 | |
1956 double region_elapsed_time_ms = | |
1957 predict_rs_scan_time_ms(card_num) + | |
1958 predict_object_copy_time_ms(bytes_to_copy); | |
1959 | |
1960 if (young) | |
1961 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
1962 else | |
1963 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
1964 | |
1965 return region_elapsed_time_ms; | |
1966 } | |
1967 | |
1968 size_t | |
1969 G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { | |
1970 size_t bytes_to_copy; | |
1971 if (hr->is_marked()) | |
1972 bytes_to_copy = hr->max_live_bytes(); | |
1973 else { | |
1974 guarantee( hr->is_young() && hr->age_in_surv_rate_group() != -1, | |
1975 "invariant" ); | |
1976 int age = hr->age_in_surv_rate_group(); | |
545 | 1977 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
342 | 1978 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
1979 } | |
1980 | |
1981 return bytes_to_copy; | |
1982 } | |
1983 | |
1984 void | |
1985 G1CollectorPolicy::start_recording_regions() { | |
1986 _recorded_rs_lengths = 0; | |
1987 _recorded_scan_only_regions = 0; | |
1988 _recorded_young_regions = 0; | |
1989 _recorded_non_young_regions = 0; | |
1990 | |
1991 #if PREDICTIONS_VERBOSE | |
1992 _predicted_rs_lengths = 0; | |
1993 _predicted_cards_scanned = 0; | |
1994 | |
1995 _recorded_marked_bytes = 0; | |
1996 _recorded_young_bytes = 0; | |
1997 _predicted_bytes_to_copy = 0; | |
1998 #endif // PREDICTIONS_VERBOSE | |
1999 } | |
2000 | |
2001 void | |
2002 G1CollectorPolicy::record_cset_region(HeapRegion* hr, bool young) { | |
2003 if (young) { | |
2004 ++_recorded_young_regions; | |
2005 } else { | |
2006 ++_recorded_non_young_regions; | |
2007 } | |
2008 #if PREDICTIONS_VERBOSE | |
2009 if (young) { | |
545 | 2010 _recorded_young_bytes += hr->used(); |
342 | 2011 } else { |
2012 _recorded_marked_bytes += hr->max_live_bytes(); | |
2013 } | |
2014 _predicted_bytes_to_copy += predict_bytes_to_copy(hr); | |
2015 #endif // PREDICTIONS_VERBOSE | |
2016 | |
2017 size_t rs_length = hr->rem_set()->occupied(); | |
2018 _recorded_rs_lengths += rs_length; | |
2019 } | |
2020 | |
2021 void | |
2022 G1CollectorPolicy::record_scan_only_regions(size_t scan_only_length) { | |
2023 _recorded_scan_only_regions = scan_only_length; | |
2024 } | |
2025 | |
2026 void | |
2027 G1CollectorPolicy::end_recording_regions() { | |
2028 #if PREDICTIONS_VERBOSE | |
2029 _predicted_pending_cards = predict_pending_cards(); | |
2030 _predicted_rs_lengths = _recorded_rs_lengths + predict_rs_length_diff(); | |
2031 if (full_young_gcs()) | |
2032 _predicted_cards_scanned += predict_young_card_num(_predicted_rs_lengths); | |
2033 else | |
2034 _predicted_cards_scanned += | |
2035 predict_non_young_card_num(_predicted_rs_lengths); | |
2036 _recorded_region_num = _recorded_young_regions + _recorded_non_young_regions; | |
2037 | |
2038 _predicted_scan_only_scan_time_ms = | |
2039 predict_scan_only_time_ms(_recorded_scan_only_regions); | |
2040 _predicted_rs_update_time_ms = | |
2041 predict_rs_update_time_ms(_g1->pending_card_num()); | |
2042 _predicted_rs_scan_time_ms = | |
2043 predict_rs_scan_time_ms(_predicted_cards_scanned); | |
2044 _predicted_object_copy_time_ms = | |
2045 predict_object_copy_time_ms(_predicted_bytes_to_copy); | |
2046 _predicted_constant_other_time_ms = | |
2047 predict_constant_other_time_ms(); | |
2048 _predicted_young_other_time_ms = | |
2049 predict_young_other_time_ms(_recorded_young_regions); | |
2050 _predicted_non_young_other_time_ms = | |
2051 predict_non_young_other_time_ms(_recorded_non_young_regions); | |
2052 | |
2053 _predicted_pause_time_ms = | |
2054 _predicted_scan_only_scan_time_ms + | |
2055 _predicted_rs_update_time_ms + | |
2056 _predicted_rs_scan_time_ms + | |
2057 _predicted_object_copy_time_ms + | |
2058 _predicted_constant_other_time_ms + | |
2059 _predicted_young_other_time_ms + | |
2060 _predicted_non_young_other_time_ms; | |
2061 #endif // PREDICTIONS_VERBOSE | |
2062 } | |
2063 | |
2064 void G1CollectorPolicy::check_if_region_is_too_expensive(double | |
2065 predicted_time_ms) { | |
2066 // I don't think we need to do this when in young GC mode since | |
2067 // marking will be initiated next time we hit the soft limit anyway... | |
2068 if (predicted_time_ms > _expensive_region_limit_ms) { | |
2069 if (!in_young_gc_mode()) { | |
2070 set_full_young_gcs(true); | |
2071 _should_initiate_conc_mark = true; | |
2072 } else | |
2073 // no point in doing another partial one | |
2074 _should_revert_to_full_young_gcs = true; | |
2075 } | |
2076 } | |
2077 | |
2078 // </NEW PREDICTION> | |
2079 | |
2080 | |
2081 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, | |
2082 double elapsed_ms) { | |
2083 _recent_gc_times_ms->add(elapsed_ms); | |
2084 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
2085 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
2086 } | |
2087 | |
2088 double G1CollectorPolicy::recent_avg_time_for_pauses_ms() { | |
751 | 2089 if (_recent_pause_times_ms->num() == 0) return (double) MaxGCPauseMillis; |
342 | 2090 else return _recent_pause_times_ms->avg(); |
2091 } | |
2092 | |
2093 double G1CollectorPolicy::recent_avg_time_for_CH_strong_ms() { | |
2094 if (_recent_CH_strong_roots_times_ms->num() == 0) | |
751 | 2095 return (double)MaxGCPauseMillis/3.0; |
342 | 2096 else return _recent_CH_strong_roots_times_ms->avg(); |
2097 } | |
2098 | |
2099 double G1CollectorPolicy::recent_avg_time_for_G1_strong_ms() { | |
2100 if (_recent_G1_strong_roots_times_ms->num() == 0) | |
751 | 2101 return (double)MaxGCPauseMillis/3.0; |
342 | 2102 else return _recent_G1_strong_roots_times_ms->avg(); |
2103 } | |
2104 | |
2105 double G1CollectorPolicy::recent_avg_time_for_evac_ms() { | |
751 | 2106 if (_recent_evac_times_ms->num() == 0) return (double)MaxGCPauseMillis/3.0; |
342 | 2107 else return _recent_evac_times_ms->avg(); |
2108 } | |
2109 | |
2110 int G1CollectorPolicy::number_of_recent_gcs() { | |
2111 assert(_recent_CH_strong_roots_times_ms->num() == | |
2112 _recent_G1_strong_roots_times_ms->num(), "Sequence out of sync"); | |
2113 assert(_recent_G1_strong_roots_times_ms->num() == | |
2114 _recent_evac_times_ms->num(), "Sequence out of sync"); | |
2115 assert(_recent_evac_times_ms->num() == | |
2116 _recent_pause_times_ms->num(), "Sequence out of sync"); | |
2117 assert(_recent_pause_times_ms->num() == | |
2118 _recent_CS_bytes_used_before->num(), "Sequence out of sync"); | |
2119 assert(_recent_CS_bytes_used_before->num() == | |
2120 _recent_CS_bytes_surviving->num(), "Sequence out of sync"); | |
2121 return _recent_pause_times_ms->num(); | |
2122 } | |
2123 | |
2124 double G1CollectorPolicy::recent_avg_survival_fraction() { | |
2125 return recent_avg_survival_fraction_work(_recent_CS_bytes_surviving, | |
2126 _recent_CS_bytes_used_before); | |
2127 } | |
2128 | |
2129 double G1CollectorPolicy::last_survival_fraction() { | |
2130 return last_survival_fraction_work(_recent_CS_bytes_surviving, | |
2131 _recent_CS_bytes_used_before); | |
2132 } | |
2133 | |
2134 double | |
2135 G1CollectorPolicy::recent_avg_survival_fraction_work(TruncatedSeq* surviving, | |
2136 TruncatedSeq* before) { | |
2137 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
2138 if (before->sum() > 0.0) { | |
2139 double recent_survival_rate = surviving->sum() / before->sum(); | |
2140 // We exempt parallel collection from this check because Alloc Buffer | |
2141 // fragmentation can produce negative collections. | |
2142 // Further, we're now always doing parallel collection. But I'm still | |
2143 // leaving this here as a placeholder for a more precise assertion later. | |
2144 // (DLD, 10/05.) | |
2145 assert((true || ParallelGCThreads > 0) || | |
2146 _g1->evacuation_failed() || | |
2147 recent_survival_rate <= 1.0, "Or bad frac"); | |
2148 return recent_survival_rate; | |
2149 } else { | |
2150 return 1.0; // Be conservative. | |
2151 } | |
2152 } | |
2153 | |
2154 double | |
2155 G1CollectorPolicy::last_survival_fraction_work(TruncatedSeq* surviving, | |
2156 TruncatedSeq* before) { | |
2157 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
2158 if (surviving->num() > 0 && before->last() > 0.0) { | |
2159 double last_survival_rate = surviving->last() / before->last(); | |
2160 // We exempt parallel collection from this check because Alloc Buffer | |
2161 // fragmentation can produce negative collections. | |
2162 // Further, we're now always doing parallel collection. But I'm still | |
2163 // leaving this here as a placeholder for a more precise assertion later. | |
2164 // (DLD, 10/05.) | |
2165 assert((true || ParallelGCThreads > 0) || | |
2166 last_survival_rate <= 1.0, "Or bad frac"); | |
2167 return last_survival_rate; | |
2168 } else { | |
2169 return 1.0; | |
2170 } | |
2171 } | |
2172 | |
2173 static const int survival_min_obs = 5; | |
2174 static double survival_min_obs_limits[] = { 0.9, 0.7, 0.5, 0.3, 0.1 }; | |
2175 static const double min_survival_rate = 0.1; | |
2176 | |
2177 double | |
2178 G1CollectorPolicy::conservative_avg_survival_fraction_work(double avg, | |
2179 double latest) { | |
2180 double res = avg; | |
2181 if (number_of_recent_gcs() < survival_min_obs) { | |
2182 res = MAX2(res, survival_min_obs_limits[number_of_recent_gcs()]); | |
2183 } | |
2184 res = MAX2(res, latest); | |
2185 res = MAX2(res, min_survival_rate); | |
2186 // In the parallel case, LAB fragmentation can produce "negative | |
2187 // collections"; so can evac failure. Cap at 1.0 | |
2188 res = MIN2(res, 1.0); | |
2189 return res; | |
2190 } | |
2191 | |
2192 size_t G1CollectorPolicy::expansion_amount() { | |
751 | 2193 if ((int)(recent_avg_pause_time_ratio() * 100.0) > G1GCPercent) { |
2194 // We will double the existing space, or take | |
2195 // G1ExpandByPercentOfAvailable % of the available expansion | |
2196 // space, whichever is smaller, bounded below by a minimum | |
2197 // expansion (unless that's all that's left.) | |
342 | 2198 const size_t min_expand_bytes = 1*M; |
2199 size_t reserved_bytes = _g1->g1_reserved_obj_bytes(); | |
2200 size_t committed_bytes = _g1->capacity(); | |
2201 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
2202 size_t expand_bytes; | |
2203 size_t expand_bytes_via_pct = | |
751 | 2204 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
342 | 2205 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
2206 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
2207 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
2208 if (G1PolicyVerbose > 1) { | |
2209 gclog_or_tty->print("Decided to expand: ratio = %5.2f, " | |
2210 "committed = %d%s, uncommited = %d%s, via pct = %d%s.\n" | |
2211 " Answer = %d.\n", | |
2212 recent_avg_pause_time_ratio(), | |
2213 byte_size_in_proper_unit(committed_bytes), | |
2214 proper_unit_for_byte_size(committed_bytes), | |
2215 byte_size_in_proper_unit(uncommitted_bytes), | |
2216 proper_unit_for_byte_size(uncommitted_bytes), | |
2217 byte_size_in_proper_unit(expand_bytes_via_pct), | |
2218 proper_unit_for_byte_size(expand_bytes_via_pct), | |
2219 byte_size_in_proper_unit(expand_bytes), | |
2220 proper_unit_for_byte_size(expand_bytes)); | |
2221 } | |
2222 return expand_bytes; | |
2223 } else { | |
2224 return 0; | |
2225 } | |
2226 } | |
2227 | |
2228 void G1CollectorPolicy::note_start_of_mark_thread() { | |
2229 _mark_thread_startup_sec = os::elapsedTime(); | |
2230 } | |
2231 | |
2232 class CountCSClosure: public HeapRegionClosure { | |
2233 G1CollectorPolicy* _g1_policy; | |
2234 public: | |
2235 CountCSClosure(G1CollectorPolicy* g1_policy) : | |
2236 _g1_policy(g1_policy) {} | |
2237 bool doHeapRegion(HeapRegion* r) { | |
2238 _g1_policy->_bytes_in_collection_set_before_gc += r->used(); | |
2239 return false; | |
2240 } | |
2241 }; | |
2242 | |
2243 void G1CollectorPolicy::count_CS_bytes_used() { | |
2244 CountCSClosure cs_closure(this); | |
2245 _g1->collection_set_iterate(&cs_closure); | |
2246 } | |
2247 | |
2248 static void print_indent(int level) { | |
2249 for (int j = 0; j < level+1; ++j) | |
2250 gclog_or_tty->print(" "); | |
2251 } | |
2252 | |
2253 void G1CollectorPolicy::print_summary (int level, | |
2254 const char* str, | |
2255 NumberSeq* seq) const { | |
2256 double sum = seq->sum(); | |
2257 print_indent(level); | |
2258 gclog_or_tty->print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", | |
2259 str, sum / 1000.0, seq->avg()); | |
2260 } | |
2261 | |
2262 void G1CollectorPolicy::print_summary_sd (int level, | |
2263 const char* str, | |
2264 NumberSeq* seq) const { | |
2265 print_summary(level, str, seq); | |
2266 print_indent(level + 5); | |
2267 gclog_or_tty->print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", | |
2268 seq->num(), seq->sd(), seq->maximum()); | |
2269 } | |
2270 | |
2271 void G1CollectorPolicy::check_other_times(int level, | |
2272 NumberSeq* other_times_ms, | |
2273 NumberSeq* calc_other_times_ms) const { | |
2274 bool should_print = false; | |
2275 | |
2276 double max_sum = MAX2(fabs(other_times_ms->sum()), | |
2277 fabs(calc_other_times_ms->sum())); | |
2278 double min_sum = MIN2(fabs(other_times_ms->sum()), | |
2279 fabs(calc_other_times_ms->sum())); | |
2280 double sum_ratio = max_sum / min_sum; | |
2281 if (sum_ratio > 1.1) { | |
2282 should_print = true; | |
2283 print_indent(level + 1); | |
2284 gclog_or_tty->print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); | |
2285 } | |
2286 | |
2287 double max_avg = MAX2(fabs(other_times_ms->avg()), | |
2288 fabs(calc_other_times_ms->avg())); | |
2289 double min_avg = MIN2(fabs(other_times_ms->avg()), | |
2290 fabs(calc_other_times_ms->avg())); | |
2291 double avg_ratio = max_avg / min_avg; | |
2292 if (avg_ratio > 1.1) { | |
2293 should_print = true; | |
2294 print_indent(level + 1); | |
2295 gclog_or_tty->print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); | |
2296 } | |
2297 | |
2298 if (other_times_ms->sum() < -0.01) { | |
2299 print_indent(level + 1); | |
2300 gclog_or_tty->print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); | |
2301 } | |
2302 | |
2303 if (other_times_ms->avg() < -0.01) { | |
2304 print_indent(level + 1); | |
2305 gclog_or_tty->print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); | |
2306 } | |
2307 | |
2308 if (calc_other_times_ms->sum() < -0.01) { | |
2309 should_print = true; | |
2310 print_indent(level + 1); | |
2311 gclog_or_tty->print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); | |
2312 } | |
2313 | |
2314 if (calc_other_times_ms->avg() < -0.01) { | |
2315 should_print = true; | |
2316 print_indent(level + 1); | |
2317 gclog_or_tty->print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); | |
2318 } | |
2319 | |
2320 if (should_print) | |
2321 print_summary(level, "Other(Calc)", calc_other_times_ms); | |
2322 } | |
2323 | |
2324 void G1CollectorPolicy::print_summary(PauseSummary* summary) const { | |
2325 bool parallel = ParallelGCThreads > 0; | |
2326 MainBodySummary* body_summary = summary->main_body_summary(); | |
2327 if (summary->get_total_seq()->num() > 0) { | |
677 | 2328 print_summary_sd(0, "Evacuation Pauses", summary->get_total_seq()); |
342 | 2329 if (body_summary != NULL) { |
2330 print_summary(1, "SATB Drain", body_summary->get_satb_drain_seq()); | |
2331 if (parallel) { | |
2332 print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); | |
2333 print_summary(2, "Update RS", body_summary->get_update_rs_seq()); | |
2334 print_summary(2, "Ext Root Scanning", | |
2335 body_summary->get_ext_root_scan_seq()); | |
2336 print_summary(2, "Mark Stack Scanning", | |
2337 body_summary->get_mark_stack_scan_seq()); | |
2338 print_summary(2, "Scan-Only Scanning", | |
2339 body_summary->get_scan_only_seq()); | |
2340 print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); | |
2341 print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); | |
2342 print_summary(2, "Termination", body_summary->get_termination_seq()); | |
2343 print_summary(2, "Other", body_summary->get_parallel_other_seq()); | |
2344 { | |
2345 NumberSeq* other_parts[] = { | |
2346 body_summary->get_update_rs_seq(), | |
2347 body_summary->get_ext_root_scan_seq(), | |
2348 body_summary->get_mark_stack_scan_seq(), | |
2349 body_summary->get_scan_only_seq(), | |
2350 body_summary->get_scan_rs_seq(), | |
2351 body_summary->get_obj_copy_seq(), | |
2352 body_summary->get_termination_seq() | |
2353 }; | |
2354 NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), | |
2355 7, other_parts); | |
2356 check_other_times(2, body_summary->get_parallel_other_seq(), | |
2357 &calc_other_times_ms); | |
2358 } | |
2359 print_summary(1, "Mark Closure", body_summary->get_mark_closure_seq()); | |
2360 print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); | |
2361 } else { | |
2362 print_summary(1, "Update RS", body_summary->get_update_rs_seq()); | |
2363 print_summary(1, "Ext Root Scanning", | |
2364 body_summary->get_ext_root_scan_seq()); | |
2365 print_summary(1, "Mark Stack Scanning", | |
2366 body_summary->get_mark_stack_scan_seq()); | |
2367 print_summary(1, "Scan-Only Scanning", | |
2368 body_summary->get_scan_only_seq()); | |
2369 print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); | |
2370 print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); | |
2371 } | |
2372 } | |
2373 print_summary(1, "Other", summary->get_other_seq()); | |
2374 { | |
2375 NumberSeq calc_other_times_ms; | |
2376 if (body_summary != NULL) { | |
2377 // not abandoned | |
2378 if (parallel) { | |
2379 // parallel | |
2380 NumberSeq* other_parts[] = { | |
2381 body_summary->get_satb_drain_seq(), | |
2382 body_summary->get_parallel_seq(), | |
2383 body_summary->get_clear_ct_seq() | |
2384 }; | |
677 | 2385 calc_other_times_ms = NumberSeq(summary->get_total_seq(), |
2386 3, other_parts); | |
342 | 2387 } else { |
2388 // serial | |
2389 NumberSeq* other_parts[] = { | |
2390 body_summary->get_satb_drain_seq(), | |
2391 body_summary->get_update_rs_seq(), | |
2392 body_summary->get_ext_root_scan_seq(), | |
2393 body_summary->get_mark_stack_scan_seq(), | |
2394 body_summary->get_scan_only_seq(), | |
2395 body_summary->get_scan_rs_seq(), | |
2396 body_summary->get_obj_copy_seq() | |
2397 }; | |
2398 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
677 | 2399 7, other_parts); |
342 | 2400 } |
2401 } else { | |
2402 // abandoned | |
677 | 2403 calc_other_times_ms = NumberSeq(); |
342 | 2404 } |
2405 check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); | |
2406 } | |
2407 } else { | |
2408 print_indent(0); | |
2409 gclog_or_tty->print_cr("none"); | |
2410 } | |
2411 gclog_or_tty->print_cr(""); | |
2412 } | |
2413 | |
2414 void | |
677 | 2415 G1CollectorPolicy::print_abandoned_summary(PauseSummary* summary) const { |
342 | 2416 bool printed = false; |
677 | 2417 if (summary->get_total_seq()->num() > 0) { |
342 | 2418 printed = true; |
677 | 2419 print_summary(summary); |
342 | 2420 } |
2421 if (!printed) { | |
2422 print_indent(0); | |
2423 gclog_or_tty->print_cr("none"); | |
2424 gclog_or_tty->print_cr(""); | |
2425 } | |
2426 } | |
2427 | |
2428 void G1CollectorPolicy::print_tracing_info() const { | |
2429 if (TraceGen0Time) { | |
2430 gclog_or_tty->print_cr("ALL PAUSES"); | |
2431 print_summary_sd(0, "Total", _all_pause_times_ms); | |
2432 gclog_or_tty->print_cr(""); | |
2433 gclog_or_tty->print_cr(""); | |
2434 gclog_or_tty->print_cr(" Full Young GC Pauses: %8d", _full_young_pause_num); | |
2435 gclog_or_tty->print_cr(" Partial Young GC Pauses: %8d", _partial_young_pause_num); | |
2436 gclog_or_tty->print_cr(""); | |
2437 | |
677 | 2438 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
2439 print_summary(_summary); | |
342 | 2440 |
2441 gclog_or_tty->print_cr("ABANDONED PAUSES"); | |
677 | 2442 print_abandoned_summary(_abandoned_summary); |
342 | 2443 |
2444 gclog_or_tty->print_cr("MISC"); | |
2445 print_summary_sd(0, "Stop World", _all_stop_world_times_ms); | |
2446 print_summary_sd(0, "Yields", _all_yield_times_ms); | |
2447 for (int i = 0; i < _aux_num; ++i) { | |
2448 if (_all_aux_times_ms[i].num() > 0) { | |
2449 char buffer[96]; | |
2450 sprintf(buffer, "Aux%d", i); | |
2451 print_summary_sd(0, buffer, &_all_aux_times_ms[i]); | |
2452 } | |
2453 } | |
2454 | |
2455 size_t all_region_num = _region_num_young + _region_num_tenured; | |
2456 gclog_or_tty->print_cr(" New Regions %8d, Young %8d (%6.2lf%%), " | |
2457 "Tenured %8d (%6.2lf%%)", | |
2458 all_region_num, | |
2459 _region_num_young, | |
2460 (double) _region_num_young / (double) all_region_num * 100.0, | |
2461 _region_num_tenured, | |
2462 (double) _region_num_tenured / (double) all_region_num * 100.0); | |
2463 } | |
2464 if (TraceGen1Time) { | |
2465 if (_all_full_gc_times_ms->num() > 0) { | |
2466 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", | |
2467 _all_full_gc_times_ms->num(), | |
2468 _all_full_gc_times_ms->sum() / 1000.0); | |
2469 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); | |
2470 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", | |
2471 _all_full_gc_times_ms->sd(), | |
2472 _all_full_gc_times_ms->maximum()); | |
2473 } | |
2474 } | |
2475 } | |
2476 | |
2477 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
2478 #ifndef PRODUCT | |
2479 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
2480 // add this call for any other surv rate groups | |
2481 #endif // PRODUCT | |
2482 } | |
2483 | |
2484 bool | |
2485 G1CollectorPolicy::should_add_next_region_to_young_list() { | |
2486 assert(in_young_gc_mode(), "should be in young GC mode"); | |
2487 bool ret; | |
2488 size_t young_list_length = _g1->young_list_length(); | |
545 | 2489 size_t young_list_max_length = _young_list_target_length; |
2490 if (G1FixedEdenSize) { | |
2491 young_list_max_length -= _max_survivor_regions; | |
2492 } | |
2493 if (young_list_length < young_list_max_length) { | |
342 | 2494 ret = true; |
2495 ++_region_num_young; | |
2496 } else { | |
2497 ret = false; | |
2498 ++_region_num_tenured; | |
2499 } | |
2500 | |
2501 return ret; | |
2502 } | |
2503 | |
2504 #ifndef PRODUCT | |
2505 // for debugging, bit of a hack... | |
2506 static char* | |
2507 region_num_to_mbs(int length) { | |
2508 static char buffer[64]; | |
2509 double bytes = (double) (length * HeapRegion::GrainBytes); | |
2510 double mbs = bytes / (double) (1024 * 1024); | |
2511 sprintf(buffer, "%7.2lfMB", mbs); | |
2512 return buffer; | |
2513 } | |
2514 #endif // PRODUCT | |
2515 | |
2516 void | |
2517 G1CollectorPolicy::checkpoint_conc_overhead() { | |
2518 double conc_overhead = 0.0; | |
2519 if (G1AccountConcurrentOverhead) | |
2520 conc_overhead = COTracker::totalPredConcOverhead(); | |
2521 _mmu_tracker->update_conc_overhead(conc_overhead); | |
2522 #if 0 | |
2523 gclog_or_tty->print(" CO %1.4lf TARGET %1.4lf", | |
2524 conc_overhead, _mmu_tracker->max_gc_time()); | |
2525 #endif | |
2526 } | |
2527 | |
2528 | |
545 | 2529 size_t G1CollectorPolicy::max_regions(int purpose) { |
342 | 2530 switch (purpose) { |
2531 case GCAllocForSurvived: | |
545 | 2532 return _max_survivor_regions; |
342 | 2533 case GCAllocForTenured: |
545 | 2534 return REGIONS_UNLIMITED; |
342 | 2535 default: |
545 | 2536 ShouldNotReachHere(); |
2537 return REGIONS_UNLIMITED; | |
342 | 2538 }; |
2539 } | |
2540 | |
545 | 2541 // Calculates survivor space parameters. |
2542 void G1CollectorPolicy::calculate_survivors_policy() | |
2543 { | |
751 | 2544 if (!G1UseSurvivorSpaces) { |
545 | 2545 return; |
2546 } | |
2547 if (G1FixedSurvivorSpaceSize == 0) { | |
2548 _max_survivor_regions = _young_list_target_length / SurvivorRatio; | |
2549 } else { | |
547
1e458753107d
6802413: G1: G1FixedSurvivorSpaceSize should be converted into regions in calculate_survivors_policy()
apetrusenko
parents:
545
diff
changeset
|
2550 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
545 | 2551 } |
2552 | |
2553 if (G1FixedTenuringThreshold) { | |
2554 _tenuring_threshold = MaxTenuringThreshold; | |
2555 } else { | |
2556 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( | |
2557 HeapRegion::GrainWords * _max_survivor_regions); | |
2558 } | |
2559 } | |
2560 | |
342 | 2561 bool |
2562 G1CollectorPolicy_BestRegionsFirst::should_do_collection_pause(size_t | |
2563 word_size) { | |
2564 assert(_g1->regions_accounted_for(), "Region leakage!"); | |
2565 // Initiate a pause when we reach the steady-state "used" target. | |
2566 size_t used_hard = (_g1->capacity() / 100) * G1SteadyStateUsed; | |
2567 size_t used_soft = | |
2568 MAX2((_g1->capacity() / 100) * (G1SteadyStateUsed - G1SteadyStateUsedDelta), | |
2569 used_hard/2); | |
2570 size_t used = _g1->used(); | |
2571 | |
2572 double max_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; | |
2573 | |
2574 size_t young_list_length = _g1->young_list_length(); | |
545 | 2575 size_t young_list_max_length = _young_list_target_length; |
2576 if (G1FixedEdenSize) { | |
2577 young_list_max_length -= _max_survivor_regions; | |
2578 } | |
2579 bool reached_target_length = young_list_length >= young_list_max_length; | |
342 | 2580 |
2581 if (in_young_gc_mode()) { | |
2582 if (reached_target_length) { | |
2583 assert( young_list_length > 0 && _g1->young_list_length() > 0, | |
2584 "invariant" ); | |
2585 _target_pause_time_ms = max_pause_time_ms; | |
2586 return true; | |
2587 } | |
2588 } else { | |
2589 guarantee( false, "should not reach here" ); | |
2590 } | |
2591 | |
2592 return false; | |
2593 } | |
2594 | |
2595 #ifndef PRODUCT | |
2596 class HRSortIndexIsOKClosure: public HeapRegionClosure { | |
2597 CollectionSetChooser* _chooser; | |
2598 public: | |
2599 HRSortIndexIsOKClosure(CollectionSetChooser* chooser) : | |
2600 _chooser(chooser) {} | |
2601 | |
2602 bool doHeapRegion(HeapRegion* r) { | |
2603 if (!r->continuesHumongous()) { | |
2604 assert(_chooser->regionProperlyOrdered(r), "Ought to be."); | |
2605 } | |
2606 return false; | |
2607 } | |
2608 }; | |
2609 | |
2610 bool G1CollectorPolicy_BestRegionsFirst::assertMarkedBytesDataOK() { | |
2611 HRSortIndexIsOKClosure cl(_collectionSetChooser); | |
2612 _g1->heap_region_iterate(&cl); | |
2613 return true; | |
2614 } | |
2615 #endif | |
2616 | |
2617 void | |
2618 G1CollectorPolicy_BestRegionsFirst:: | |
2619 record_collection_pause_start(double start_time_sec, size_t start_used) { | |
2620 G1CollectorPolicy::record_collection_pause_start(start_time_sec, start_used); | |
2621 } | |
2622 | |
2623 class NextNonCSElemFinder: public HeapRegionClosure { | |
2624 HeapRegion* _res; | |
2625 public: | |
2626 NextNonCSElemFinder(): _res(NULL) {} | |
2627 bool doHeapRegion(HeapRegion* r) { | |
2628 if (!r->in_collection_set()) { | |
2629 _res = r; | |
2630 return true; | |
2631 } else { | |
2632 return false; | |
2633 } | |
2634 } | |
2635 HeapRegion* res() { return _res; } | |
2636 }; | |
2637 | |
2638 class KnownGarbageClosure: public HeapRegionClosure { | |
2639 CollectionSetChooser* _hrSorted; | |
2640 | |
2641 public: | |
2642 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
2643 _hrSorted(hrSorted) | |
2644 {} | |
2645 | |
2646 bool doHeapRegion(HeapRegion* r) { | |
2647 // We only include humongous regions in collection | |
2648 // sets when concurrent mark shows that their contained object is | |
2649 // unreachable. | |
2650 | |
2651 // Do we have any marking information for this region? | |
2652 if (r->is_marked()) { | |
2653 // We don't include humongous regions in collection | |
2654 // sets because we collect them immediately at the end of a marking | |
2655 // cycle. We also don't include young regions because we *must* | |
2656 // include them in the next collection pause. | |
2657 if (!r->isHumongous() && !r->is_young()) { | |
2658 _hrSorted->addMarkedHeapRegion(r); | |
2659 } | |
2660 } | |
2661 return false; | |
2662 } | |
2663 }; | |
2664 | |
2665 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
2666 CollectionSetChooser* _hrSorted; | |
2667 jint _marked_regions_added; | |
2668 jint _chunk_size; | |
2669 jint _cur_chunk_idx; | |
2670 jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) | |
2671 int _worker; | |
2672 int _invokes; | |
2673 | |
2674 void get_new_chunk() { | |
2675 _cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size); | |
2676 _cur_chunk_end = _cur_chunk_idx + _chunk_size; | |
2677 } | |
2678 void add_region(HeapRegion* r) { | |
2679 if (_cur_chunk_idx == _cur_chunk_end) { | |
2680 get_new_chunk(); | |
2681 } | |
2682 assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); | |
2683 _hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r); | |
2684 _marked_regions_added++; | |
2685 _cur_chunk_idx++; | |
2686 } | |
2687 | |
2688 public: | |
2689 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
2690 jint chunk_size, | |
2691 int worker) : | |
2692 _hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker), | |
2693 _marked_regions_added(0), _cur_chunk_idx(0), _cur_chunk_end(0), | |
2694 _invokes(0) | |
2695 {} | |
2696 | |
2697 bool doHeapRegion(HeapRegion* r) { | |
2698 // We only include humongous regions in collection | |
2699 // sets when concurrent mark shows that their contained object is | |
2700 // unreachable. | |
2701 _invokes++; | |
2702 | |
2703 // Do we have any marking information for this region? | |
2704 if (r->is_marked()) { | |
2705 // We don't include humongous regions in collection | |
2706 // sets because we collect them immediately at the end of a marking | |
2707 // cycle. | |
2708 // We also do not include young regions in collection sets | |
2709 if (!r->isHumongous() && !r->is_young()) { | |
2710 add_region(r); | |
2711 } | |
2712 } | |
2713 return false; | |
2714 } | |
2715 jint marked_regions_added() { return _marked_regions_added; } | |
2716 int invokes() { return _invokes; } | |
2717 }; | |
2718 | |
2719 class ParKnownGarbageTask: public AbstractGangTask { | |
2720 CollectionSetChooser* _hrSorted; | |
2721 jint _chunk_size; | |
2722 G1CollectedHeap* _g1; | |
2723 public: | |
2724 ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) : | |
2725 AbstractGangTask("ParKnownGarbageTask"), | |
2726 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
2727 _g1(G1CollectedHeap::heap()) | |
2728 {} | |
2729 | |
2730 void work(int i) { | |
2731 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size, i); | |
2732 // Back to zero for the claim value. | |
355 | 2733 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, i, |
2734 HeapRegion::InitialClaimValue); | |
342 | 2735 jint regions_added = parKnownGarbageCl.marked_regions_added(); |
2736 _hrSorted->incNumMarkedHeapRegions(regions_added); | |
2737 if (G1PrintParCleanupStats) { | |
2738 gclog_or_tty->print(" Thread %d called %d times, added %d regions to list.\n", | |
2739 i, parKnownGarbageCl.invokes(), regions_added); | |
2740 } | |
2741 } | |
2742 }; | |
2743 | |
2744 void | |
2745 G1CollectorPolicy_BestRegionsFirst:: | |
2746 record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
2747 size_t max_live_bytes) { | |
2748 double start; | |
2749 if (G1PrintParCleanupStats) start = os::elapsedTime(); | |
2750 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
2751 | |
2752 _collectionSetChooser->clearMarkedHeapRegions(); | |
2753 double clear_marked_end; | |
2754 if (G1PrintParCleanupStats) { | |
2755 clear_marked_end = os::elapsedTime(); | |
2756 gclog_or_tty->print_cr(" clear marked regions + work1: %8.3f ms.", | |
2757 (clear_marked_end - start)*1000.0); | |
2758 } | |
2759 if (ParallelGCThreads > 0) { | |
2760 const size_t OverpartitionFactor = 4; | |
2761 const size_t MinChunkSize = 8; | |
2762 const size_t ChunkSize = | |
2763 MAX2(_g1->n_regions() / (ParallelGCThreads * OverpartitionFactor), | |
2764 MinChunkSize); | |
2765 _collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(), | |
2766 ChunkSize); | |
2767 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, | |
2768 (int) ChunkSize); | |
2769 _g1->workers()->run_task(&parKnownGarbageTask); | |
355 | 2770 |
2771 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2772 "sanity check"); | |
342 | 2773 } else { |
2774 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
2775 _g1->heap_region_iterate(&knownGarbagecl); | |
2776 } | |
2777 double known_garbage_end; | |
2778 if (G1PrintParCleanupStats) { | |
2779 known_garbage_end = os::elapsedTime(); | |
2780 gclog_or_tty->print_cr(" compute known garbage: %8.3f ms.", | |
2781 (known_garbage_end - clear_marked_end)*1000.0); | |
2782 } | |
2783 _collectionSetChooser->sortMarkedHeapRegions(); | |
2784 double sort_end; | |
2785 if (G1PrintParCleanupStats) { | |
2786 sort_end = os::elapsedTime(); | |
2787 gclog_or_tty->print_cr(" sorting: %8.3f ms.", | |
2788 (sort_end - known_garbage_end)*1000.0); | |
2789 } | |
2790 | |
2791 record_concurrent_mark_cleanup_end_work2(); | |
2792 double work2_end; | |
2793 if (G1PrintParCleanupStats) { | |
2794 work2_end = os::elapsedTime(); | |
2795 gclog_or_tty->print_cr(" work2: %8.3f ms.", | |
2796 (work2_end - sort_end)*1000.0); | |
2797 } | |
2798 } | |
2799 | |
2800 // Add the heap region to the collection set and return the conservative | |
2801 // estimate of the number of live bytes. | |
2802 void G1CollectorPolicy:: | |
2803 add_to_collection_set(HeapRegion* hr) { | |
751 | 2804 if (G1PrintRegions) { |
342 | 2805 gclog_or_tty->print_cr("added region to cset %d:["PTR_FORMAT", "PTR_FORMAT"], " |
2806 "top "PTR_FORMAT", young %s", | |
2807 hr->hrs_index(), hr->bottom(), hr->end(), | |
2808 hr->top(), (hr->is_young()) ? "YES" : "NO"); | |
2809 } | |
2810 | |
2811 if (_g1->mark_in_progress()) | |
2812 _g1->concurrent_mark()->registerCSetRegion(hr); | |
2813 | |
2814 assert(!hr->in_collection_set(), | |
2815 "should not already be in the CSet"); | |
2816 hr->set_in_collection_set(true); | |
2817 hr->set_next_in_collection_set(_collection_set); | |
2818 _collection_set = hr; | |
2819 _collection_set_size++; | |
2820 _collection_set_bytes_used_before += hr->used(); | |
526 | 2821 _g1->register_region_with_in_cset_fast_test(hr); |
342 | 2822 } |
2823 | |
2824 void | |
2825 G1CollectorPolicy_BestRegionsFirst:: | |
677 | 2826 choose_collection_set() { |
342 | 2827 double non_young_start_time_sec; |
2828 start_recording_regions(); | |
2829 | |
677 | 2830 guarantee(_target_pause_time_ms > -1.0, |
2831 "_target_pause_time_ms should have been set!"); | |
2832 assert(_collection_set == NULL, "Precondition"); | |
342 | 2833 |
2834 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
2835 double predicted_pause_time_ms = base_time_ms; | |
2836 | |
2837 double target_time_ms = _target_pause_time_ms; | |
2838 double time_remaining_ms = target_time_ms - base_time_ms; | |
2839 | |
2840 // the 10% and 50% values are arbitrary... | |
2841 if (time_remaining_ms < 0.10*target_time_ms) { | |
2842 time_remaining_ms = 0.50 * target_time_ms; | |
2843 _within_target = false; | |
2844 } else { | |
2845 _within_target = true; | |
2846 } | |
2847 | |
2848 // We figure out the number of bytes available for future to-space. | |
2849 // For new regions without marking information, we must assume the | |
2850 // worst-case of complete survival. If we have marking information for a | |
2851 // region, we can bound the amount of live data. We can add a number of | |
2852 // such regions, as long as the sum of the live data bounds does not | |
2853 // exceed the available evacuation space. | |
2854 size_t max_live_bytes = _g1->free_regions() * HeapRegion::GrainBytes; | |
2855 | |
2856 size_t expansion_bytes = | |
2857 _g1->expansion_regions() * HeapRegion::GrainBytes; | |
2858 | |
677 | 2859 _collection_set_bytes_used_before = 0; |
2860 _collection_set_size = 0; | |
342 | 2861 |
2862 // Adjust for expansion and slop. | |
2863 max_live_bytes = max_live_bytes + expansion_bytes; | |
2864 | |
677 | 2865 assert(_g1->regions_accounted_for(), "Region leakage!"); |
342 | 2866 |
2867 HeapRegion* hr; | |
2868 if (in_young_gc_mode()) { | |
2869 double young_start_time_sec = os::elapsedTime(); | |
2870 | |
2871 if (G1PolicyVerbose > 0) { | |
2872 gclog_or_tty->print_cr("Adding %d young regions to the CSet", | |
2873 _g1->young_list_length()); | |
2874 } | |
2875 _young_cset_length = 0; | |
2876 _last_young_gc_full = full_young_gcs() ? true : false; | |
2877 if (_last_young_gc_full) | |
2878 ++_full_young_pause_num; | |
2879 else | |
2880 ++_partial_young_pause_num; | |
2881 hr = _g1->pop_region_from_young_list(); | |
2882 while (hr != NULL) { | |
2883 | |
2884 assert( hr->young_index_in_cset() == -1, "invariant" ); | |
2885 assert( hr->age_in_surv_rate_group() != -1, "invariant" ); | |
2886 hr->set_young_index_in_cset((int) _young_cset_length); | |
2887 | |
2888 ++_young_cset_length; | |
2889 double predicted_time_ms = predict_region_elapsed_time_ms(hr, true); | |
2890 time_remaining_ms -= predicted_time_ms; | |
2891 predicted_pause_time_ms += predicted_time_ms; | |
677 | 2892 assert(!hr->in_collection_set(), "invariant"); |
2893 add_to_collection_set(hr); | |
2894 record_cset_region(hr, true); | |
342 | 2895 max_live_bytes -= MIN2(hr->max_live_bytes(), max_live_bytes); |
2896 if (G1PolicyVerbose > 0) { | |
2897 gclog_or_tty->print_cr(" Added [" PTR_FORMAT ", " PTR_FORMAT") to CS.", | |
2898 hr->bottom(), hr->end()); | |
2899 gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", | |
2900 max_live_bytes/K); | |
2901 } | |
2902 hr = _g1->pop_region_from_young_list(); | |
2903 } | |
2904 | |
2905 record_scan_only_regions(_g1->young_list_scan_only_length()); | |
2906 | |
2907 double young_end_time_sec = os::elapsedTime(); | |
2908 _recorded_young_cset_choice_time_ms = | |
2909 (young_end_time_sec - young_start_time_sec) * 1000.0; | |
2910 | |
2911 non_young_start_time_sec = os::elapsedTime(); | |
2912 | |
2913 if (_young_cset_length > 0 && _last_young_gc_full) { | |
2914 // don't bother adding more regions... | |
2915 goto choose_collection_set_end; | |
2916 } | |
2917 } | |
2918 | |
2919 if (!in_young_gc_mode() || !full_young_gcs()) { | |
2920 bool should_continue = true; | |
2921 NumberSeq seq; | |
2922 double avg_prediction = 100000000000000000.0; // something very large | |
2923 do { | |
2924 hr = _collectionSetChooser->getNextMarkedRegion(time_remaining_ms, | |
2925 avg_prediction); | |
677 | 2926 if (hr != NULL) { |
342 | 2927 double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
2928 time_remaining_ms -= predicted_time_ms; | |
2929 predicted_pause_time_ms += predicted_time_ms; | |
2930 add_to_collection_set(hr); | |
2931 record_cset_region(hr, false); | |
2932 max_live_bytes -= MIN2(hr->max_live_bytes(), max_live_bytes); | |
2933 if (G1PolicyVerbose > 0) { | |
2934 gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", | |
2935 max_live_bytes/K); | |
2936 } | |
2937 seq.add(predicted_time_ms); | |
2938 avg_prediction = seq.avg() + seq.sd(); | |
2939 } | |
2940 should_continue = | |
2941 ( hr != NULL) && | |
2942 ( (adaptive_young_list_length()) ? time_remaining_ms > 0.0 | |
2943 : _collection_set_size < _young_list_fixed_length ); | |
2944 } while (should_continue); | |
2945 | |
2946 if (!adaptive_young_list_length() && | |
2947 _collection_set_size < _young_list_fixed_length) | |
2948 _should_revert_to_full_young_gcs = true; | |
2949 } | |
2950 | |
2951 choose_collection_set_end: | |
2952 count_CS_bytes_used(); | |
2953 | |
2954 end_recording_regions(); | |
2955 | |
2956 double non_young_end_time_sec = os::elapsedTime(); | |
2957 _recorded_non_young_cset_choice_time_ms = | |
2958 (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; | |
2959 } | |
2960 | |
2961 void G1CollectorPolicy_BestRegionsFirst::record_full_collection_end() { | |
2962 G1CollectorPolicy::record_full_collection_end(); | |
2963 _collectionSetChooser->updateAfterFullCollection(); | |
2964 } | |
2965 | |
2966 void G1CollectorPolicy_BestRegionsFirst:: | |
2967 expand_if_possible(size_t numRegions) { | |
2968 size_t expansion_bytes = numRegions * HeapRegion::GrainBytes; | |
2969 _g1->expand(expansion_bytes); | |
2970 } | |
2971 | |
2972 void G1CollectorPolicy_BestRegionsFirst:: | |
677 | 2973 record_collection_pause_end(bool abandoned) { |
2974 G1CollectorPolicy::record_collection_pause_end(abandoned); | |
342 | 2975 assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end."); |
2976 } | |
2977 | |
2978 // Local Variables: *** | |
2979 // c-indentation-style: gnu *** | |
2980 // End: *** |