Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 648:2314b7336582
6820321: G1: Error: guarantee(check_nums(total, n, parts), "all seq lengths should match")
Summary: Small fixes to sort out some verbosegc-related incorrectness and a failure
Reviewed-by: apetrusenko
author | tonyp |
---|---|
date | Sat, 21 Mar 2009 22:53:04 -0400 |
parents | ba50942c8138 |
children | 96b229c54d1e |
rev | line source |
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342 | 1 /* |
579 | 2 * Copyright 2001-2009 Sun Microsystems, Inc. All Rights Reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 #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 | |
94 _non_pop_summary(new NonPopSummary()), | |
95 _pop_summary(new PopSummary()), | |
96 _non_pop_abandoned_summary(new NonPopAbandonedSummary()), | |
97 _pop_abandoned_summary(new PopAbandonedSummary()), | |
98 | |
99 _cur_clear_ct_time_ms(0.0), | |
100 | |
101 _region_num_young(0), | |
102 _region_num_tenured(0), | |
103 _prev_region_num_young(0), | |
104 _prev_region_num_tenured(0), | |
105 | |
106 _aux_num(10), | |
107 _all_aux_times_ms(new NumberSeq[_aux_num]), | |
108 _cur_aux_start_times_ms(new double[_aux_num]), | |
109 _cur_aux_times_ms(new double[_aux_num]), | |
110 _cur_aux_times_set(new bool[_aux_num]), | |
111 | |
112 _pop_compute_rc_start(0.0), | |
113 _pop_evac_start(0.0), | |
114 | |
115 _concurrent_mark_init_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
116 _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
117 _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
118 | |
119 // <NEW PREDICTION> | |
120 | |
121 _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
122 _prev_collection_pause_end_ms(0.0), | |
123 _pending_card_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
124 _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
125 _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
126 _cost_per_scan_only_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
127 _fully_young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), | |
128 _partially_young_cards_per_entry_ratio_seq( | |
129 new TruncatedSeq(TruncatedSeqLength)), | |
130 _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
131 _partially_young_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
132 _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
133 _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
134 _cost_per_scan_only_region_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
135 _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
136 _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
137 _non_young_other_cost_per_region_ms_seq( | |
138 new TruncatedSeq(TruncatedSeqLength)), | |
139 | |
140 _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
141 _scanned_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
142 _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), | |
143 | |
144 _pause_time_target_ms((double) G1MaxPauseTimeMS), | |
145 | |
146 // </NEW PREDICTION> | |
147 | |
148 _in_young_gc_mode(false), | |
149 _full_young_gcs(true), | |
150 _full_young_pause_num(0), | |
151 _partial_young_pause_num(0), | |
152 | |
153 _during_marking(false), | |
154 _in_marking_window(false), | |
155 _in_marking_window_im(false), | |
156 | |
157 _known_garbage_ratio(0.0), | |
158 _known_garbage_bytes(0), | |
159 | |
160 _young_gc_eff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
161 _target_pause_time_ms(-1.0), | |
162 | |
163 _recent_prev_end_times_for_all_gcs_sec(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
164 | |
165 _recent_CS_bytes_used_before(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
166 _recent_CS_bytes_surviving(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
167 | |
168 _recent_avg_pause_time_ratio(0.0), | |
169 _num_markings(0), | |
170 _n_marks(0), | |
171 _n_pauses_at_mark_end(0), | |
172 | |
173 _all_full_gc_times_ms(new NumberSeq()), | |
174 | |
175 _conc_refine_enabled(0), | |
176 _conc_refine_zero_traversals(0), | |
177 _conc_refine_max_traversals(0), | |
178 _conc_refine_current_delta(G1ConcRefineInitialDelta), | |
179 | |
180 // G1PausesBtwnConcMark defaults to -1 | |
181 // so the hack is to do the cast QQQ FIXME | |
182 _pauses_btwn_concurrent_mark((size_t)G1PausesBtwnConcMark), | |
183 _n_marks_since_last_pause(0), | |
184 _conc_mark_initiated(false), | |
185 _should_initiate_conc_mark(false), | |
186 _should_revert_to_full_young_gcs(false), | |
187 _last_full_young_gc(false), | |
188 | |
189 _prev_collection_pause_used_at_end_bytes(0), | |
190 | |
191 _collection_set(NULL), | |
192 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
193 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
194 #endif // _MSC_VER | |
195 | |
196 _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", | |
197 G1YoungSurvRateNumRegionsSummary)), | |
198 _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", | |
545 | 199 G1YoungSurvRateNumRegionsSummary)), |
342 | 200 // add here any more surv rate groups |
545 | 201 _recorded_survivor_regions(0), |
202 _recorded_survivor_head(NULL), | |
203 _recorded_survivor_tail(NULL), | |
204 _survivors_age_table(true) | |
205 | |
342 | 206 { |
207 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); | |
208 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
209 | |
210 _par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads]; | |
211 _par_last_mark_stack_scan_times_ms = new double[_parallel_gc_threads]; | |
212 _par_last_scan_only_times_ms = new double[_parallel_gc_threads]; | |
213 _par_last_scan_only_regions_scanned = new double[_parallel_gc_threads]; | |
214 | |
215 _par_last_update_rs_start_times_ms = new double[_parallel_gc_threads]; | |
216 _par_last_update_rs_times_ms = new double[_parallel_gc_threads]; | |
217 _par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; | |
218 | |
219 _par_last_scan_rs_start_times_ms = new double[_parallel_gc_threads]; | |
220 _par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; | |
221 _par_last_scan_new_refs_times_ms = new double[_parallel_gc_threads]; | |
222 | |
223 _par_last_obj_copy_times_ms = new double[_parallel_gc_threads]; | |
224 | |
225 _par_last_termination_times_ms = new double[_parallel_gc_threads]; | |
226 | |
227 // we store the data from the first pass during popularity pauses | |
228 _pop_par_last_update_rs_start_times_ms = new double[_parallel_gc_threads]; | |
229 _pop_par_last_update_rs_times_ms = new double[_parallel_gc_threads]; | |
230 _pop_par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; | |
231 | |
232 _pop_par_last_scan_rs_start_times_ms = new double[_parallel_gc_threads]; | |
233 _pop_par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; | |
234 | |
235 _pop_par_last_closure_app_times_ms = new double[_parallel_gc_threads]; | |
236 | |
237 // start conservatively | |
238 _expensive_region_limit_ms = 0.5 * (double) G1MaxPauseTimeMS; | |
239 | |
240 // <NEW PREDICTION> | |
241 | |
242 int index; | |
243 if (ParallelGCThreads == 0) | |
244 index = 0; | |
245 else if (ParallelGCThreads > 8) | |
246 index = 7; | |
247 else | |
248 index = ParallelGCThreads - 1; | |
249 | |
250 _pending_card_diff_seq->add(0.0); | |
251 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
252 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
253 _cost_per_scan_only_region_ms_seq->add( | |
254 cost_per_scan_only_region_ms_defaults[index]); | |
255 _fully_young_cards_per_entry_ratio_seq->add( | |
256 fully_young_cards_per_entry_ratio_defaults[index]); | |
257 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); | |
258 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
259 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
260 _young_other_cost_per_region_ms_seq->add( | |
261 young_other_cost_per_region_ms_defaults[index]); | |
262 _non_young_other_cost_per_region_ms_seq->add( | |
263 non_young_other_cost_per_region_ms_defaults[index]); | |
264 | |
265 // </NEW PREDICTION> | |
266 | |
267 double time_slice = (double) G1TimeSliceMS / 1000.0; | |
268 double max_gc_time = (double) G1MaxPauseTimeMS / 1000.0; | |
269 guarantee(max_gc_time < time_slice, | |
270 "Max GC time should not be greater than the time slice"); | |
271 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); | |
272 _sigma = (double) G1ConfidencePerc / 100.0; | |
273 | |
274 // start conservatively (around 50ms is about right) | |
275 _concurrent_mark_init_times_ms->add(0.05); | |
276 _concurrent_mark_remark_times_ms->add(0.05); | |
277 _concurrent_mark_cleanup_times_ms->add(0.20); | |
278 _tenuring_threshold = MaxTenuringThreshold; | |
279 | |
545 | 280 if (G1UseSurvivorSpace) { |
281 // if G1FixedSurvivorSpaceSize is 0 which means the size is not | |
282 // fixed, then _max_survivor_regions will be calculated at | |
547
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283 // calculate_young_list_target_config during initialization |
545 | 284 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
285 } else { | |
286 _max_survivor_regions = 0; | |
287 } | |
288 | |
342 | 289 initialize_all(); |
290 } | |
291 | |
292 // Increment "i", mod "len" | |
293 static void inc_mod(int& i, int len) { | |
294 i++; if (i == len) i = 0; | |
295 } | |
296 | |
297 void G1CollectorPolicy::initialize_flags() { | |
298 set_min_alignment(HeapRegion::GrainBytes); | |
299 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
547
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300 if (SurvivorRatio < 1) { |
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301 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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302 } |
342 | 303 CollectorPolicy::initialize_flags(); |
304 } | |
305 | |
306 void G1CollectorPolicy::init() { | |
307 // Set aside an initial future to_space. | |
308 _g1 = G1CollectedHeap::heap(); | |
309 size_t regions = Universe::heap()->capacity() / HeapRegion::GrainBytes; | |
310 | |
311 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
312 | |
313 if (G1SteadyStateUsed < 50) { | |
314 vm_exit_during_initialization("G1SteadyStateUsed must be at least 50%."); | |
315 } | |
316 if (UseConcMarkSweepGC) { | |
317 vm_exit_during_initialization("-XX:+UseG1GC is incompatible with " | |
318 "-XX:+UseConcMarkSweepGC."); | |
319 } | |
320 | |
545 | 321 initialize_gc_policy_counters(); |
322 | |
342 | 323 if (G1Gen) { |
324 _in_young_gc_mode = true; | |
325 | |
326 if (G1YoungGenSize == 0) { | |
327 set_adaptive_young_list_length(true); | |
328 _young_list_fixed_length = 0; | |
329 } else { | |
330 set_adaptive_young_list_length(false); | |
331 _young_list_fixed_length = (G1YoungGenSize / HeapRegion::GrainBytes); | |
332 } | |
333 _free_regions_at_end_of_collection = _g1->free_regions(); | |
334 _scan_only_regions_at_end_of_collection = 0; | |
335 calculate_young_list_min_length(); | |
336 guarantee( _young_list_min_length == 0, "invariant, not enough info" ); | |
337 calculate_young_list_target_config(); | |
338 } else { | |
339 _young_list_fixed_length = 0; | |
340 _in_young_gc_mode = false; | |
341 } | |
342 } | |
343 | |
545 | 344 // Create the jstat counters for the policy. |
345 void G1CollectorPolicy::initialize_gc_policy_counters() | |
346 { | |
347 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 2 + G1Gen); | |
348 } | |
349 | |
342 | 350 void G1CollectorPolicy::calculate_young_list_min_length() { |
351 _young_list_min_length = 0; | |
352 | |
353 if (!adaptive_young_list_length()) | |
354 return; | |
355 | |
356 if (_alloc_rate_ms_seq->num() > 3) { | |
357 double now_sec = os::elapsedTime(); | |
358 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; | |
359 double alloc_rate_ms = predict_alloc_rate_ms(); | |
360 int min_regions = (int) ceil(alloc_rate_ms * when_ms); | |
361 int current_region_num = (int) _g1->young_list_length(); | |
362 _young_list_min_length = min_regions + current_region_num; | |
363 } | |
364 } | |
365 | |
366 void G1CollectorPolicy::calculate_young_list_target_config() { | |
367 if (adaptive_young_list_length()) { | |
368 size_t rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); | |
369 calculate_young_list_target_config(rs_lengths); | |
370 } else { | |
371 if (full_young_gcs()) | |
372 _young_list_target_length = _young_list_fixed_length; | |
373 else | |
374 _young_list_target_length = _young_list_fixed_length / 2; | |
375 _young_list_target_length = MAX2(_young_list_target_length, (size_t)1); | |
376 size_t so_length = calculate_optimal_so_length(_young_list_target_length); | |
377 guarantee( so_length < _young_list_target_length, "invariant" ); | |
378 _young_list_so_prefix_length = so_length; | |
379 } | |
545 | 380 calculate_survivors_policy(); |
342 | 381 } |
382 | |
383 // This method calculate the optimal scan-only set for a fixed young | |
384 // gen size. I couldn't work out how to reuse the more elaborate one, | |
385 // i.e. calculate_young_list_target_config(rs_length), as the loops are | |
386 // fundamentally different (the other one finds a config for different | |
387 // S-O lengths, whereas here we need to do the opposite). | |
388 size_t G1CollectorPolicy::calculate_optimal_so_length( | |
389 size_t young_list_length) { | |
390 if (!G1UseScanOnlyPrefix) | |
391 return 0; | |
392 | |
393 if (_all_pause_times_ms->num() < 3) { | |
394 // we won't use a scan-only set at the beginning to allow the rest | |
395 // of the predictors to warm up | |
396 return 0; | |
397 } | |
398 | |
399 if (_cost_per_scan_only_region_ms_seq->num() < 3) { | |
400 // then, we'll only set the S-O set to 1 for a little bit of time, | |
401 // to get enough information on the scanning cost | |
402 return 1; | |
403 } | |
404 | |
405 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); | |
406 size_t rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); | |
407 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); | |
408 size_t scanned_cards; | |
409 if (full_young_gcs()) | |
410 scanned_cards = predict_young_card_num(adj_rs_lengths); | |
411 else | |
412 scanned_cards = predict_non_young_card_num(adj_rs_lengths); | |
413 double base_time_ms = predict_base_elapsed_time_ms(pending_cards, | |
414 scanned_cards); | |
415 | |
416 size_t so_length = 0; | |
417 double max_gc_eff = 0.0; | |
418 for (size_t i = 0; i < young_list_length; ++i) { | |
419 double gc_eff = 0.0; | |
420 double pause_time_ms = 0.0; | |
421 predict_gc_eff(young_list_length, i, base_time_ms, | |
422 &gc_eff, &pause_time_ms); | |
423 if (gc_eff > max_gc_eff) { | |
424 max_gc_eff = gc_eff; | |
425 so_length = i; | |
426 } | |
427 } | |
428 | |
429 // set it to 95% of the optimal to make sure we sample the "area" | |
430 // around the optimal length to get up-to-date survival rate data | |
431 return so_length * 950 / 1000; | |
432 } | |
433 | |
434 // This is a really cool piece of code! It finds the best | |
435 // target configuration (young length / scan-only prefix length) so | |
436 // that GC efficiency is maximized and that we also meet a pause | |
437 // time. It's a triple nested loop. These loops are explained below | |
438 // from the inside-out :-) | |
439 // | |
440 // (a) The innermost loop will try to find the optimal young length | |
441 // for a fixed S-O length. It uses a binary search to speed up the | |
442 // process. We assume that, for a fixed S-O length, as we add more | |
443 // young regions to the CSet, the GC efficiency will only go up (I'll | |
444 // skip the proof). So, using a binary search to optimize this process | |
445 // makes perfect sense. | |
446 // | |
447 // (b) The middle loop will fix the S-O length before calling the | |
448 // innermost one. It will vary it between two parameters, increasing | |
449 // it by a given increment. | |
450 // | |
451 // (c) The outermost loop will call the middle loop three times. | |
452 // (1) The first time it will explore all possible S-O length values | |
453 // from 0 to as large as it can get, using a coarse increment (to | |
454 // quickly "home in" to where the optimal seems to be). | |
455 // (2) The second time it will explore the values around the optimal | |
456 // that was found by the first iteration using a fine increment. | |
457 // (3) Once the optimal config has been determined by the second | |
458 // iteration, we'll redo the calculation, but setting the S-O length | |
459 // to 95% of the optimal to make sure we sample the "area" | |
460 // around the optimal length to get up-to-date survival rate data | |
461 // | |
462 // Termination conditions for the iterations are several: the pause | |
463 // time is over the limit, we do not have enough to-space, etc. | |
464 | |
465 void G1CollectorPolicy::calculate_young_list_target_config(size_t rs_lengths) { | |
466 guarantee( adaptive_young_list_length(), "pre-condition" ); | |
467 | |
468 double start_time_sec = os::elapsedTime(); | |
469 size_t min_reserve_perc = MAX2((size_t)2, (size_t)G1MinReservePerc); | |
470 min_reserve_perc = MIN2((size_t) 50, min_reserve_perc); | |
471 size_t reserve_regions = | |
472 (size_t) ((double) min_reserve_perc * (double) _g1->n_regions() / 100.0); | |
473 | |
474 if (full_young_gcs() && _free_regions_at_end_of_collection > 0) { | |
475 // we are in fully-young mode and there are free regions in the heap | |
476 | |
545 | 477 double survivor_regions_evac_time = |
478 predict_survivor_regions_evac_time(); | |
479 | |
342 | 480 size_t min_so_length = 0; |
481 size_t max_so_length = 0; | |
482 | |
483 if (G1UseScanOnlyPrefix) { | |
484 if (_all_pause_times_ms->num() < 3) { | |
485 // we won't use a scan-only set at the beginning to allow the rest | |
486 // of the predictors to warm up | |
487 min_so_length = 0; | |
488 max_so_length = 0; | |
489 } else if (_cost_per_scan_only_region_ms_seq->num() < 3) { | |
490 // then, we'll only set the S-O set to 1 for a little bit of time, | |
491 // to get enough information on the scanning cost | |
492 min_so_length = 1; | |
493 max_so_length = 1; | |
494 } else if (_in_marking_window || _last_full_young_gc) { | |
495 // no S-O prefix during a marking phase either, as at the end | |
496 // of the marking phase we'll have to use a very small young | |
497 // length target to fill up the rest of the CSet with | |
498 // non-young regions and, if we have lots of scan-only regions | |
499 // left-over, we will not be able to add any more non-young | |
500 // regions. | |
501 min_so_length = 0; | |
502 max_so_length = 0; | |
503 } else { | |
504 // this is the common case; we'll never reach the maximum, we | |
505 // one of the end conditions will fire well before that | |
506 // (hopefully!) | |
507 min_so_length = 0; | |
508 max_so_length = _free_regions_at_end_of_collection - 1; | |
509 } | |
510 } else { | |
511 // no S-O prefix, as the switch is not set, but we still need to | |
512 // do one iteration to calculate the best young target that | |
513 // meets the pause time; this way we reuse the same code instead | |
514 // of replicating it | |
515 min_so_length = 0; | |
516 max_so_length = 0; | |
517 } | |
518 | |
519 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; | |
520 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); | |
521 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); | |
522 size_t scanned_cards; | |
523 if (full_young_gcs()) | |
524 scanned_cards = predict_young_card_num(adj_rs_lengths); | |
525 else | |
526 scanned_cards = predict_non_young_card_num(adj_rs_lengths); | |
527 // calculate this once, so that we don't have to recalculate it in | |
528 // the innermost loop | |
545 | 529 double base_time_ms = predict_base_elapsed_time_ms(pending_cards, scanned_cards) |
530 + survivor_regions_evac_time; | |
342 | 531 // the result |
532 size_t final_young_length = 0; | |
533 size_t final_so_length = 0; | |
534 double final_gc_eff = 0.0; | |
535 // we'll also keep track of how many times we go into the inner loop | |
536 // this is for profiling reasons | |
537 size_t calculations = 0; | |
538 | |
539 // this determines which of the three iterations the outer loop is in | |
540 typedef enum { | |
541 pass_type_coarse, | |
542 pass_type_fine, | |
543 pass_type_final | |
544 } pass_type_t; | |
545 | |
546 // range of the outer loop's iteration | |
547 size_t from_so_length = min_so_length; | |
548 size_t to_so_length = max_so_length; | |
549 guarantee( from_so_length <= to_so_length, "invariant" ); | |
550 | |
551 // this will keep the S-O length that's found by the second | |
552 // iteration of the outer loop; we'll keep it just in case the third | |
553 // iteration fails to find something | |
554 size_t fine_so_length = 0; | |
555 | |
556 // the increment step for the coarse (first) iteration | |
557 size_t so_coarse_increments = 5; | |
558 | |
559 // the common case, we'll start with the coarse iteration | |
560 pass_type_t pass = pass_type_coarse; | |
561 size_t so_length_incr = so_coarse_increments; | |
562 | |
563 if (from_so_length == to_so_length) { | |
564 // not point in doing the coarse iteration, we'll go directly into | |
565 // the fine one (we essentially trying to find the optimal young | |
566 // length for a fixed S-O length). | |
567 so_length_incr = 1; | |
568 pass = pass_type_final; | |
569 } else if (to_so_length - from_so_length < 3 * so_coarse_increments) { | |
570 // again, the range is too short so no point in foind the coarse | |
571 // iteration either | |
572 so_length_incr = 1; | |
573 pass = pass_type_fine; | |
574 } | |
575 | |
576 bool done = false; | |
577 // this is the outermost loop | |
578 while (!done) { | |
545 | 579 #ifdef TRACE_CALC_YOUNG_CONFIG |
342 | 580 // leave this in for debugging, just in case |
581 gclog_or_tty->print_cr("searching between " SIZE_FORMAT " and " SIZE_FORMAT | |
582 ", incr " SIZE_FORMAT ", pass %s", | |
583 from_so_length, to_so_length, so_length_incr, | |
584 (pass == pass_type_coarse) ? "coarse" : | |
585 (pass == pass_type_fine) ? "fine" : "final"); | |
545 | 586 #endif // TRACE_CALC_YOUNG_CONFIG |
342 | 587 |
588 size_t so_length = from_so_length; | |
589 size_t init_free_regions = | |
590 MAX2((size_t)0, | |
591 _free_regions_at_end_of_collection + | |
592 _scan_only_regions_at_end_of_collection - reserve_regions); | |
593 | |
594 // this determines whether a configuration was found | |
595 bool gc_eff_set = false; | |
596 // this is the middle loop | |
597 while (so_length <= to_so_length) { | |
598 // base time, which excludes region-related time; again we | |
599 // calculate it once to avoid recalculating it in the | |
600 // innermost loop | |
601 double base_time_with_so_ms = | |
602 base_time_ms + predict_scan_only_time_ms(so_length); | |
603 // it's already over the pause target, go around | |
604 if (base_time_with_so_ms > target_pause_time_ms) | |
605 break; | |
606 | |
607 size_t starting_young_length = so_length+1; | |
608 | |
609 // we make sure that the short young length that makes sense | |
610 // (one more than the S-O length) is feasible | |
611 size_t min_young_length = starting_young_length; | |
612 double min_gc_eff; | |
613 bool min_ok; | |
614 ++calculations; | |
615 min_ok = predict_gc_eff(min_young_length, so_length, | |
616 base_time_with_so_ms, | |
617 init_free_regions, target_pause_time_ms, | |
618 &min_gc_eff); | |
619 | |
620 if (min_ok) { | |
621 // the shortest young length is indeed feasible; we'll know | |
622 // set up the max young length and we'll do a binary search | |
623 // between min_young_length and max_young_length | |
624 size_t max_young_length = _free_regions_at_end_of_collection - 1; | |
625 double max_gc_eff = 0.0; | |
626 bool max_ok = false; | |
627 | |
628 // the innermost loop! (finally!) | |
629 while (max_young_length > min_young_length) { | |
630 // we'll make sure that min_young_length is always at a | |
631 // feasible config | |
632 guarantee( min_ok, "invariant" ); | |
633 | |
634 ++calculations; | |
635 max_ok = predict_gc_eff(max_young_length, so_length, | |
636 base_time_with_so_ms, | |
637 init_free_regions, target_pause_time_ms, | |
638 &max_gc_eff); | |
639 | |
640 size_t diff = (max_young_length - min_young_length) / 2; | |
641 if (max_ok) { | |
642 min_young_length = max_young_length; | |
643 min_gc_eff = max_gc_eff; | |
644 min_ok = true; | |
645 } | |
646 max_young_length = min_young_length + diff; | |
647 } | |
648 | |
649 // the innermost loop found a config | |
650 guarantee( min_ok, "invariant" ); | |
651 if (min_gc_eff > final_gc_eff) { | |
652 // it's the best config so far, so we'll keep it | |
653 final_gc_eff = min_gc_eff; | |
654 final_young_length = min_young_length; | |
655 final_so_length = so_length; | |
656 gc_eff_set = true; | |
657 } | |
658 } | |
659 | |
660 // incremental the fixed S-O length and go around | |
661 so_length += so_length_incr; | |
662 } | |
663 | |
664 // this is the end of the outermost loop and we need to decide | |
665 // what to do during the next iteration | |
666 if (pass == pass_type_coarse) { | |
667 // we just did the coarse pass (first iteration) | |
668 | |
669 if (!gc_eff_set) | |
670 // we didn't find a feasible config so we'll just bail out; of | |
671 // course, it might be the case that we missed it; but I'd say | |
672 // it's a bit unlikely | |
673 done = true; | |
674 else { | |
675 // We did find a feasible config with optimal GC eff during | |
676 // the first pass. So the second pass we'll only consider the | |
677 // S-O lengths around that config with a fine increment. | |
678 | |
679 guarantee( so_length_incr == so_coarse_increments, "invariant" ); | |
680 guarantee( final_so_length >= min_so_length, "invariant" ); | |
681 | |
545 | 682 #ifdef TRACE_CALC_YOUNG_CONFIG |
342 | 683 // leave this in for debugging, just in case |
684 gclog_or_tty->print_cr(" coarse pass: SO length " SIZE_FORMAT, | |
685 final_so_length); | |
545 | 686 #endif // TRACE_CALC_YOUNG_CONFIG |
342 | 687 |
688 from_so_length = | |
689 (final_so_length - min_so_length > so_coarse_increments) ? | |
690 final_so_length - so_coarse_increments + 1 : min_so_length; | |
691 to_so_length = | |
692 (max_so_length - final_so_length > so_coarse_increments) ? | |
693 final_so_length + so_coarse_increments - 1 : max_so_length; | |
694 | |
695 pass = pass_type_fine; | |
696 so_length_incr = 1; | |
697 } | |
698 } else if (pass == pass_type_fine) { | |
699 // we just finished the second pass | |
700 | |
701 if (!gc_eff_set) { | |
702 // we didn't find a feasible config (yes, it's possible; | |
703 // notice that, sometimes, we go directly into the fine | |
704 // iteration and skip the coarse one) so we bail out | |
705 done = true; | |
706 } else { | |
707 // We did find a feasible config with optimal GC eff | |
708 guarantee( so_length_incr == 1, "invariant" ); | |
709 | |
710 if (final_so_length == 0) { | |
711 // The config is of an empty S-O set, so we'll just bail out | |
712 done = true; | |
713 } else { | |
714 // we'll go around once more, setting the S-O length to 95% | |
715 // of the optimal | |
716 size_t new_so_length = 950 * final_so_length / 1000; | |
717 | |
545 | 718 #ifdef TRACE_CALC_YOUNG_CONFIG |
342 | 719 // leave this in for debugging, just in case |
720 gclog_or_tty->print_cr(" fine pass: SO length " SIZE_FORMAT | |
721 ", setting it to " SIZE_FORMAT, | |
722 final_so_length, new_so_length); | |
545 | 723 #endif // TRACE_CALC_YOUNG_CONFIG |
342 | 724 |
725 from_so_length = new_so_length; | |
726 to_so_length = new_so_length; | |
727 fine_so_length = final_so_length; | |
728 | |
729 pass = pass_type_final; | |
730 } | |
731 } | |
732 } else if (pass == pass_type_final) { | |
733 // we just finished the final (third) pass | |
734 | |
735 if (!gc_eff_set) | |
736 // we didn't find a feasible config, so we'll just use the one | |
737 // we found during the second pass, which we saved | |
738 final_so_length = fine_so_length; | |
739 | |
740 // and we're done! | |
741 done = true; | |
742 } else { | |
743 guarantee( false, "should never reach here" ); | |
744 } | |
745 | |
746 // we now go around the outermost loop | |
747 } | |
748 | |
749 // we should have at least one region in the target young length | |
545 | 750 _young_list_target_length = |
751 MAX2((size_t) 1, final_young_length + _recorded_survivor_regions); | |
342 | 752 if (final_so_length >= final_young_length) |
753 // and we need to ensure that the S-O length is not greater than | |
754 // the target young length (this is being a bit careful) | |
755 final_so_length = 0; | |
756 _young_list_so_prefix_length = final_so_length; | |
757 guarantee( !_in_marking_window || !_last_full_young_gc || | |
758 _young_list_so_prefix_length == 0, "invariant" ); | |
759 | |
760 // let's keep an eye of how long we spend on this calculation | |
761 // right now, I assume that we'll print it when we need it; we | |
762 // should really adde it to the breakdown of a pause | |
763 double end_time_sec = os::elapsedTime(); | |
764 double elapsed_time_ms = (end_time_sec - start_time_sec) * 1000.0; | |
765 | |
545 | 766 #ifdef TRACE_CALC_YOUNG_CONFIG |
342 | 767 // leave this in for debugging, just in case |
768 gclog_or_tty->print_cr("target = %1.1lf ms, young = " SIZE_FORMAT | |
769 ", SO = " SIZE_FORMAT ", " | |
770 "elapsed %1.2lf ms, calcs: " SIZE_FORMAT " (%s%s) " | |
771 SIZE_FORMAT SIZE_FORMAT, | |
772 target_pause_time_ms, | |
773 _young_list_target_length - _young_list_so_prefix_length, | |
774 _young_list_so_prefix_length, | |
775 elapsed_time_ms, | |
776 calculations, | |
777 full_young_gcs() ? "full" : "partial", | |
778 should_initiate_conc_mark() ? " i-m" : "", | |
545 | 779 _in_marking_window, |
780 _in_marking_window_im); | |
781 #endif // TRACE_CALC_YOUNG_CONFIG | |
342 | 782 |
783 if (_young_list_target_length < _young_list_min_length) { | |
784 // bummer; this means that, if we do a pause when the optimal | |
785 // config dictates, we'll violate the pause spacing target (the | |
786 // min length was calculate based on the application's current | |
787 // alloc rate); | |
788 | |
789 // so, we have to bite the bullet, and allocate the minimum | |
790 // number. We'll violate our target, but we just can't meet it. | |
791 | |
792 size_t so_length = 0; | |
793 // a note further up explains why we do not want an S-O length | |
794 // during marking | |
795 if (!_in_marking_window && !_last_full_young_gc) | |
796 // but we can still try to see whether we can find an optimal | |
797 // S-O length | |
798 so_length = calculate_optimal_so_length(_young_list_min_length); | |
799 | |
545 | 800 #ifdef TRACE_CALC_YOUNG_CONFIG |
342 | 801 // leave this in for debugging, just in case |
802 gclog_or_tty->print_cr("adjusted target length from " | |
803 SIZE_FORMAT " to " SIZE_FORMAT | |
804 ", SO " SIZE_FORMAT, | |
805 _young_list_target_length, _young_list_min_length, | |
806 so_length); | |
545 | 807 #endif // TRACE_CALC_YOUNG_CONFIG |
342 | 808 |
809 _young_list_target_length = | |
810 MAX2(_young_list_min_length, (size_t)1); | |
811 _young_list_so_prefix_length = so_length; | |
812 } | |
813 } else { | |
814 // we are in a partially-young mode or we've run out of regions (due | |
815 // to evacuation failure) | |
816 | |
545 | 817 #ifdef TRACE_CALC_YOUNG_CONFIG |
342 | 818 // leave this in for debugging, just in case |
819 gclog_or_tty->print_cr("(partial) setting target to " SIZE_FORMAT | |
820 ", SO " SIZE_FORMAT, | |
821 _young_list_min_length, 0); | |
545 | 822 #endif // TRACE_CALC_YOUNG_CONFIG |
342 | 823 |
824 // we'll do the pause as soon as possible and with no S-O prefix | |
825 // (see above for the reasons behind the latter) | |
826 _young_list_target_length = | |
827 MAX2(_young_list_min_length, (size_t) 1); | |
828 _young_list_so_prefix_length = 0; | |
829 } | |
830 | |
831 _rs_lengths_prediction = rs_lengths; | |
832 } | |
833 | |
834 // This is used by: calculate_optimal_so_length(length). It returns | |
835 // the GC eff and predicted pause time for a particular config | |
836 void | |
837 G1CollectorPolicy::predict_gc_eff(size_t young_length, | |
838 size_t so_length, | |
839 double base_time_ms, | |
840 double* ret_gc_eff, | |
841 double* ret_pause_time_ms) { | |
842 double so_time_ms = predict_scan_only_time_ms(so_length); | |
843 double accum_surv_rate_adj = 0.0; | |
844 if (so_length > 0) | |
845 accum_surv_rate_adj = accum_yg_surv_rate_pred((int)(so_length - 1)); | |
846 double accum_surv_rate = | |
847 accum_yg_surv_rate_pred((int)(young_length - 1)) - accum_surv_rate_adj; | |
848 size_t bytes_to_copy = | |
849 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); | |
850 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); | |
851 double young_other_time_ms = | |
852 predict_young_other_time_ms(young_length - so_length); | |
853 double pause_time_ms = | |
854 base_time_ms + so_time_ms + copy_time_ms + young_other_time_ms; | |
855 size_t reclaimed_bytes = | |
856 (young_length - so_length) * HeapRegion::GrainBytes - bytes_to_copy; | |
857 double gc_eff = (double) reclaimed_bytes / pause_time_ms; | |
858 | |
859 *ret_gc_eff = gc_eff; | |
860 *ret_pause_time_ms = pause_time_ms; | |
861 } | |
862 | |
863 // This is used by: calculate_young_list_target_config(rs_length). It | |
864 // returns the GC eff of a particular config. It returns false if that | |
865 // config violates any of the end conditions of the search in the | |
866 // calling method, or true upon success. The end conditions were put | |
867 // here since it's called twice and it was best not to replicate them | |
868 // in the caller. Also, passing the parameteres avoids having to | |
869 // recalculate them in the innermost loop. | |
870 bool | |
871 G1CollectorPolicy::predict_gc_eff(size_t young_length, | |
872 size_t so_length, | |
873 double base_time_with_so_ms, | |
874 size_t init_free_regions, | |
875 double target_pause_time_ms, | |
876 double* ret_gc_eff) { | |
877 *ret_gc_eff = 0.0; | |
878 | |
879 if (young_length >= init_free_regions) | |
880 // end condition 1: not enough space for the young regions | |
881 return false; | |
882 | |
883 double accum_surv_rate_adj = 0.0; | |
884 if (so_length > 0) | |
885 accum_surv_rate_adj = accum_yg_surv_rate_pred((int)(so_length - 1)); | |
886 double accum_surv_rate = | |
887 accum_yg_surv_rate_pred((int)(young_length - 1)) - accum_surv_rate_adj; | |
888 size_t bytes_to_copy = | |
889 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); | |
890 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); | |
891 double young_other_time_ms = | |
892 predict_young_other_time_ms(young_length - so_length); | |
893 double pause_time_ms = | |
894 base_time_with_so_ms + copy_time_ms + young_other_time_ms; | |
895 | |
896 if (pause_time_ms > target_pause_time_ms) | |
897 // end condition 2: over the target pause time | |
898 return false; | |
899 | |
900 size_t reclaimed_bytes = | |
901 (young_length - so_length) * HeapRegion::GrainBytes - bytes_to_copy; | |
902 size_t free_bytes = | |
903 (init_free_regions - young_length) * HeapRegion::GrainBytes; | |
904 | |
905 if ((2.0 + sigma()) * (double) bytes_to_copy > (double) free_bytes) | |
906 // end condition 3: out of to-space (conservatively) | |
907 return false; | |
908 | |
909 // success! | |
910 double gc_eff = (double) reclaimed_bytes / pause_time_ms; | |
911 *ret_gc_eff = gc_eff; | |
912 | |
913 return true; | |
914 } | |
915 | |
545 | 916 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
917 double survivor_regions_evac_time = 0.0; | |
918 for (HeapRegion * r = _recorded_survivor_head; | |
919 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
920 r = r->get_next_young_region()) { | |
921 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); | |
922 } | |
923 return survivor_regions_evac_time; | |
924 } | |
925 | |
342 | 926 void G1CollectorPolicy::check_prediction_validity() { |
927 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); | |
928 | |
929 size_t rs_lengths = _g1->young_list_sampled_rs_lengths(); | |
930 if (rs_lengths > _rs_lengths_prediction) { | |
931 // add 10% to avoid having to recalculate often | |
932 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
933 calculate_young_list_target_config(rs_lengths_prediction); | |
934 } | |
935 } | |
936 | |
937 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, | |
938 bool is_tlab, | |
939 bool* gc_overhead_limit_was_exceeded) { | |
940 guarantee(false, "Not using this policy feature yet."); | |
941 return NULL; | |
942 } | |
943 | |
944 // This method controls how a collector handles one or more | |
945 // of its generations being fully allocated. | |
946 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
947 bool is_tlab) { | |
948 guarantee(false, "Not using this policy feature yet."); | |
949 return NULL; | |
950 } | |
951 | |
952 | |
953 #ifndef PRODUCT | |
954 bool G1CollectorPolicy::verify_young_ages() { | |
955 HeapRegion* head = _g1->young_list_first_region(); | |
956 return | |
957 verify_young_ages(head, _short_lived_surv_rate_group); | |
958 // also call verify_young_ages on any additional surv rate groups | |
959 } | |
960 | |
961 bool | |
962 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
963 SurvRateGroup *surv_rate_group) { | |
964 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
965 | |
966 const char* name = surv_rate_group->name(); | |
967 bool ret = true; | |
968 int prev_age = -1; | |
969 | |
970 for (HeapRegion* curr = head; | |
971 curr != NULL; | |
972 curr = curr->get_next_young_region()) { | |
973 SurvRateGroup* group = curr->surv_rate_group(); | |
974 if (group == NULL && !curr->is_survivor()) { | |
975 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
976 ret = false; | |
977 } | |
978 | |
979 if (surv_rate_group == group) { | |
980 int age = curr->age_in_surv_rate_group(); | |
981 | |
982 if (age < 0) { | |
983 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
984 ret = false; | |
985 } | |
986 | |
987 if (age <= prev_age) { | |
988 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
989 "(%d, %d)", name, age, prev_age); | |
990 ret = false; | |
991 } | |
992 prev_age = age; | |
993 } | |
994 } | |
995 | |
996 return ret; | |
997 } | |
998 #endif // PRODUCT | |
999 | |
1000 void G1CollectorPolicy::record_full_collection_start() { | |
1001 _cur_collection_start_sec = os::elapsedTime(); | |
1002 // Release the future to-space so that it is available for compaction into. | |
1003 _g1->set_full_collection(); | |
1004 } | |
1005 | |
1006 void G1CollectorPolicy::record_full_collection_end() { | |
1007 // Consider this like a collection pause for the purposes of allocation | |
1008 // since last pause. | |
1009 double end_sec = os::elapsedTime(); | |
1010 double full_gc_time_sec = end_sec - _cur_collection_start_sec; | |
1011 double full_gc_time_ms = full_gc_time_sec * 1000.0; | |
1012 | |
1013 checkpoint_conc_overhead(); | |
1014 | |
1015 _all_full_gc_times_ms->add(full_gc_time_ms); | |
1016 | |
595
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6804746: G1: guarantee(variance() > -1.0,"variance should be >= 0") (due to evacuation failure)
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1017 update_recent_gc_times(end_sec, full_gc_time_ms); |
342 | 1018 |
1019 _g1->clear_full_collection(); | |
1020 | |
1021 // "Nuke" the heuristics that control the fully/partially young GC | |
1022 // transitions and make sure we start with fully young GCs after the | |
1023 // Full GC. | |
1024 set_full_young_gcs(true); | |
1025 _last_full_young_gc = false; | |
1026 _should_revert_to_full_young_gcs = false; | |
1027 _should_initiate_conc_mark = false; | |
1028 _known_garbage_bytes = 0; | |
1029 _known_garbage_ratio = 0.0; | |
1030 _in_marking_window = false; | |
1031 _in_marking_window_im = false; | |
1032 | |
1033 _short_lived_surv_rate_group->record_scan_only_prefix(0); | |
1034 _short_lived_surv_rate_group->start_adding_regions(); | |
1035 // also call this on any additional surv rate groups | |
1036 | |
545 | 1037 record_survivor_regions(0, NULL, NULL); |
1038 | |
342 | 1039 _prev_region_num_young = _region_num_young; |
1040 _prev_region_num_tenured = _region_num_tenured; | |
1041 | |
1042 _free_regions_at_end_of_collection = _g1->free_regions(); | |
1043 _scan_only_regions_at_end_of_collection = 0; | |
545 | 1044 // Reset survivors SurvRateGroup. |
1045 _survivor_surv_rate_group->reset(); | |
342 | 1046 calculate_young_list_min_length(); |
1047 calculate_young_list_target_config(); | |
1048 } | |
1049 | |
1050 void G1CollectorPolicy::record_pop_compute_rc_start() { | |
1051 _pop_compute_rc_start = os::elapsedTime(); | |
1052 } | |
1053 void G1CollectorPolicy::record_pop_compute_rc_end() { | |
1054 double ms = (os::elapsedTime() - _pop_compute_rc_start)*1000.0; | |
1055 _cur_popular_compute_rc_time_ms = ms; | |
1056 _pop_compute_rc_start = 0.0; | |
1057 } | |
1058 void G1CollectorPolicy::record_pop_evac_start() { | |
1059 _pop_evac_start = os::elapsedTime(); | |
1060 } | |
1061 void G1CollectorPolicy::record_pop_evac_end() { | |
1062 double ms = (os::elapsedTime() - _pop_evac_start)*1000.0; | |
1063 _cur_popular_evac_time_ms = ms; | |
1064 _pop_evac_start = 0.0; | |
1065 } | |
1066 | |
1067 void G1CollectorPolicy::record_before_bytes(size_t bytes) { | |
1068 _bytes_in_to_space_before_gc += bytes; | |
1069 } | |
1070 | |
1071 void G1CollectorPolicy::record_after_bytes(size_t bytes) { | |
1072 _bytes_in_to_space_after_gc += bytes; | |
1073 } | |
1074 | |
1075 void G1CollectorPolicy::record_stop_world_start() { | |
1076 _stop_world_start = os::elapsedTime(); | |
1077 } | |
1078 | |
1079 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, | |
1080 size_t start_used) { | |
1081 if (PrintGCDetails) { | |
1082 gclog_or_tty->stamp(PrintGCTimeStamps); | |
1083 gclog_or_tty->print("[GC pause"); | |
1084 if (in_young_gc_mode()) | |
1085 gclog_or_tty->print(" (%s)", full_young_gcs() ? "young" : "partial"); | |
1086 } | |
1087 | |
1088 assert(_g1->used_regions() == _g1->recalculate_used_regions(), | |
1089 "sanity"); | |
636 | 1090 assert(_g1->used() == _g1->recalculate_used(), "sanity"); |
342 | 1091 |
1092 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
1093 _all_stop_world_times_ms->add(s_w_t_ms); | |
1094 _stop_world_start = 0.0; | |
1095 | |
1096 _cur_collection_start_sec = start_time_sec; | |
1097 _cur_collection_pause_used_at_start_bytes = start_used; | |
1098 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); | |
1099 _pending_cards = _g1->pending_card_num(); | |
1100 _max_pending_cards = _g1->max_pending_card_num(); | |
1101 | |
1102 _bytes_in_to_space_before_gc = 0; | |
1103 _bytes_in_to_space_after_gc = 0; | |
1104 _bytes_in_collection_set_before_gc = 0; | |
1105 | |
1106 #ifdef DEBUG | |
1107 // initialise these to something well known so that we can spot | |
1108 // if they are not set properly | |
1109 | |
1110 for (int i = 0; i < _parallel_gc_threads; ++i) { | |
1111 _par_last_ext_root_scan_times_ms[i] = -666.0; | |
1112 _par_last_mark_stack_scan_times_ms[i] = -666.0; | |
1113 _par_last_scan_only_times_ms[i] = -666.0; | |
1114 _par_last_scan_only_regions_scanned[i] = -666.0; | |
1115 _par_last_update_rs_start_times_ms[i] = -666.0; | |
1116 _par_last_update_rs_times_ms[i] = -666.0; | |
1117 _par_last_update_rs_processed_buffers[i] = -666.0; | |
1118 _par_last_scan_rs_start_times_ms[i] = -666.0; | |
1119 _par_last_scan_rs_times_ms[i] = -666.0; | |
1120 _par_last_scan_new_refs_times_ms[i] = -666.0; | |
1121 _par_last_obj_copy_times_ms[i] = -666.0; | |
1122 _par_last_termination_times_ms[i] = -666.0; | |
1123 | |
1124 _pop_par_last_update_rs_start_times_ms[i] = -666.0; | |
1125 _pop_par_last_update_rs_times_ms[i] = -666.0; | |
1126 _pop_par_last_update_rs_processed_buffers[i] = -666.0; | |
1127 _pop_par_last_scan_rs_start_times_ms[i] = -666.0; | |
1128 _pop_par_last_scan_rs_times_ms[i] = -666.0; | |
1129 _pop_par_last_closure_app_times_ms[i] = -666.0; | |
1130 } | |
1131 #endif | |
1132 | |
1133 for (int i = 0; i < _aux_num; ++i) { | |
1134 _cur_aux_times_ms[i] = 0.0; | |
1135 _cur_aux_times_set[i] = false; | |
1136 } | |
1137 | |
1138 _satb_drain_time_set = false; | |
1139 _last_satb_drain_processed_buffers = -1; | |
1140 | |
1141 if (in_young_gc_mode()) | |
1142 _last_young_gc_full = false; | |
1143 | |
1144 | |
1145 // do that for any other surv rate groups | |
1146 _short_lived_surv_rate_group->stop_adding_regions(); | |
1147 size_t short_lived_so_length = _young_list_so_prefix_length; | |
1148 _short_lived_surv_rate_group->record_scan_only_prefix(short_lived_so_length); | |
1149 tag_scan_only(short_lived_so_length); | |
1150 | |
545 | 1151 if (G1UseSurvivorSpace) { |
1152 _survivors_age_table.clear(); | |
1153 } | |
1154 | |
342 | 1155 assert( verify_young_ages(), "region age verification" ); |
1156 } | |
1157 | |
1158 void G1CollectorPolicy::tag_scan_only(size_t short_lived_scan_only_length) { | |
1159 // done in a way that it can be extended for other surv rate groups too... | |
1160 | |
1161 HeapRegion* head = _g1->young_list_first_region(); | |
1162 bool finished_short_lived = (short_lived_scan_only_length == 0); | |
1163 | |
1164 if (finished_short_lived) | |
1165 return; | |
1166 | |
1167 for (HeapRegion* curr = head; | |
1168 curr != NULL; | |
1169 curr = curr->get_next_young_region()) { | |
1170 SurvRateGroup* surv_rate_group = curr->surv_rate_group(); | |
1171 int age = curr->age_in_surv_rate_group(); | |
1172 | |
1173 if (surv_rate_group == _short_lived_surv_rate_group) { | |
1174 if ((size_t)age < short_lived_scan_only_length) | |
1175 curr->set_scan_only(); | |
1176 else | |
1177 finished_short_lived = true; | |
1178 } | |
1179 | |
1180 | |
1181 if (finished_short_lived) | |
1182 return; | |
1183 } | |
1184 | |
1185 guarantee( false, "we should never reach here" ); | |
1186 } | |
1187 | |
1188 void G1CollectorPolicy::record_popular_pause_preamble_start() { | |
1189 _cur_popular_preamble_start_ms = os::elapsedTime() * 1000.0; | |
1190 } | |
1191 | |
1192 void G1CollectorPolicy::record_popular_pause_preamble_end() { | |
1193 _cur_popular_preamble_time_ms = | |
1194 (os::elapsedTime() * 1000.0) - _cur_popular_preamble_start_ms; | |
1195 | |
1196 // copy the recorded statistics of the first pass to temporary arrays | |
1197 for (int i = 0; i < _parallel_gc_threads; ++i) { | |
1198 _pop_par_last_update_rs_start_times_ms[i] = _par_last_update_rs_start_times_ms[i]; | |
1199 _pop_par_last_update_rs_times_ms[i] = _par_last_update_rs_times_ms[i]; | |
1200 _pop_par_last_update_rs_processed_buffers[i] = _par_last_update_rs_processed_buffers[i]; | |
1201 _pop_par_last_scan_rs_start_times_ms[i] = _par_last_scan_rs_start_times_ms[i]; | |
1202 _pop_par_last_scan_rs_times_ms[i] = _par_last_scan_rs_times_ms[i]; | |
1203 _pop_par_last_closure_app_times_ms[i] = _par_last_obj_copy_times_ms[i]; | |
1204 } | |
1205 } | |
1206 | |
1207 void G1CollectorPolicy::record_mark_closure_time(double mark_closure_time_ms) { | |
1208 _mark_closure_time_ms = mark_closure_time_ms; | |
1209 } | |
1210 | |
1211 void G1CollectorPolicy::record_concurrent_mark_init_start() { | |
1212 _mark_init_start_sec = os::elapsedTime(); | |
1213 guarantee(!in_young_gc_mode(), "should not do be here in young GC mode"); | |
1214 } | |
1215 | |
1216 void G1CollectorPolicy::record_concurrent_mark_init_end_pre(double | |
1217 mark_init_elapsed_time_ms) { | |
1218 _during_marking = true; | |
1219 _should_initiate_conc_mark = false; | |
1220 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; | |
1221 } | |
1222 | |
1223 void G1CollectorPolicy::record_concurrent_mark_init_end() { | |
1224 double end_time_sec = os::elapsedTime(); | |
1225 double elapsed_time_ms = (end_time_sec - _mark_init_start_sec) * 1000.0; | |
1226 _concurrent_mark_init_times_ms->add(elapsed_time_ms); | |
1227 checkpoint_conc_overhead(); | |
1228 record_concurrent_mark_init_end_pre(elapsed_time_ms); | |
1229 | |
1230 _mmu_tracker->add_pause(_mark_init_start_sec, end_time_sec, true); | |
1231 } | |
1232 | |
1233 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
1234 _mark_remark_start_sec = os::elapsedTime(); | |
1235 _during_marking = false; | |
1236 } | |
1237 | |
1238 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
1239 double end_time_sec = os::elapsedTime(); | |
1240 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
1241 checkpoint_conc_overhead(); | |
1242 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
1243 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
1244 _prev_collection_pause_end_ms += elapsed_time_ms; | |
1245 | |
1246 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
1247 } | |
1248 | |
1249 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
1250 _mark_cleanup_start_sec = os::elapsedTime(); | |
1251 } | |
1252 | |
1253 void | |
1254 G1CollectorPolicy::record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
1255 size_t max_live_bytes) { | |
1256 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
1257 record_concurrent_mark_cleanup_end_work2(); | |
1258 } | |
1259 | |
1260 void | |
1261 G1CollectorPolicy:: | |
1262 record_concurrent_mark_cleanup_end_work1(size_t freed_bytes, | |
1263 size_t max_live_bytes) { | |
1264 if (_n_marks < 2) _n_marks++; | |
1265 if (G1PolicyVerbose > 0) | |
1266 gclog_or_tty->print_cr("At end of marking, max_live is " SIZE_FORMAT " MB " | |
1267 " (of " SIZE_FORMAT " MB heap).", | |
1268 max_live_bytes/M, _g1->capacity()/M); | |
1269 } | |
1270 | |
1271 // The important thing about this is that it includes "os::elapsedTime". | |
1272 void G1CollectorPolicy::record_concurrent_mark_cleanup_end_work2() { | |
1273 checkpoint_conc_overhead(); | |
1274 double end_time_sec = os::elapsedTime(); | |
1275 double elapsed_time_ms = (end_time_sec - _mark_cleanup_start_sec)*1000.0; | |
1276 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
1277 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
1278 _prev_collection_pause_end_ms += elapsed_time_ms; | |
1279 | |
1280 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_time_sec, true); | |
1281 | |
1282 _num_markings++; | |
1283 | |
1284 // We did a marking, so reset the "since_last_mark" variables. | |
1285 double considerConcMarkCost = 1.0; | |
1286 // If there are available processors, concurrent activity is free... | |
1287 if (Threads::number_of_non_daemon_threads() * 2 < | |
1288 os::active_processor_count()) { | |
1289 considerConcMarkCost = 0.0; | |
1290 } | |
1291 _n_pauses_at_mark_end = _n_pauses; | |
1292 _n_marks_since_last_pause++; | |
1293 _conc_mark_initiated = false; | |
1294 } | |
1295 | |
1296 void | |
1297 G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { | |
1298 if (in_young_gc_mode()) { | |
1299 _should_revert_to_full_young_gcs = false; | |
1300 _last_full_young_gc = true; | |
1301 _in_marking_window = false; | |
1302 if (adaptive_young_list_length()) | |
1303 calculate_young_list_target_config(); | |
1304 } | |
1305 } | |
1306 | |
1307 void G1CollectorPolicy::record_concurrent_pause() { | |
1308 if (_stop_world_start > 0.0) { | |
1309 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
1310 _all_yield_times_ms->add(yield_ms); | |
1311 } | |
1312 } | |
1313 | |
1314 void G1CollectorPolicy::record_concurrent_pause_end() { | |
1315 } | |
1316 | |
1317 void G1CollectorPolicy::record_collection_pause_end_CH_strong_roots() { | |
1318 _cur_CH_strong_roots_end_sec = os::elapsedTime(); | |
1319 _cur_CH_strong_roots_dur_ms = | |
1320 (_cur_CH_strong_roots_end_sec - _cur_collection_start_sec) * 1000.0; | |
1321 } | |
1322 | |
1323 void G1CollectorPolicy::record_collection_pause_end_G1_strong_roots() { | |
1324 _cur_G1_strong_roots_end_sec = os::elapsedTime(); | |
1325 _cur_G1_strong_roots_dur_ms = | |
1326 (_cur_G1_strong_roots_end_sec - _cur_CH_strong_roots_end_sec) * 1000.0; | |
1327 } | |
1328 | |
1329 template<class T> | |
1330 T sum_of(T* sum_arr, int start, int n, int N) { | |
1331 T sum = (T)0; | |
1332 for (int i = 0; i < n; i++) { | |
1333 int j = (start + i) % N; | |
1334 sum += sum_arr[j]; | |
1335 } | |
1336 return sum; | |
1337 } | |
1338 | |
1339 void G1CollectorPolicy::print_par_stats (int level, | |
1340 const char* str, | |
1341 double* data, | |
1342 bool summary) { | |
1343 double min = data[0], max = data[0]; | |
1344 double total = 0.0; | |
1345 int j; | |
1346 for (j = 0; j < level; ++j) | |
1347 gclog_or_tty->print(" "); | |
1348 gclog_or_tty->print("[%s (ms):", str); | |
1349 for (uint i = 0; i < ParallelGCThreads; ++i) { | |
1350 double val = data[i]; | |
1351 if (val < min) | |
1352 min = val; | |
1353 if (val > max) | |
1354 max = val; | |
1355 total += val; | |
1356 gclog_or_tty->print(" %3.1lf", val); | |
1357 } | |
1358 if (summary) { | |
1359 gclog_or_tty->print_cr(""); | |
1360 double avg = total / (double) ParallelGCThreads; | |
1361 gclog_or_tty->print(" "); | |
1362 for (j = 0; j < level; ++j) | |
1363 gclog_or_tty->print(" "); | |
1364 gclog_or_tty->print("Avg: %5.1lf, Min: %5.1lf, Max: %5.1lf", | |
1365 avg, min, max); | |
1366 } | |
1367 gclog_or_tty->print_cr("]"); | |
1368 } | |
1369 | |
1370 void G1CollectorPolicy::print_par_buffers (int level, | |
1371 const char* str, | |
1372 double* data, | |
1373 bool summary) { | |
1374 double min = data[0], max = data[0]; | |
1375 double total = 0.0; | |
1376 int j; | |
1377 for (j = 0; j < level; ++j) | |
1378 gclog_or_tty->print(" "); | |
1379 gclog_or_tty->print("[%s :", str); | |
1380 for (uint i = 0; i < ParallelGCThreads; ++i) { | |
1381 double val = data[i]; | |
1382 if (val < min) | |
1383 min = val; | |
1384 if (val > max) | |
1385 max = val; | |
1386 total += val; | |
1387 gclog_or_tty->print(" %d", (int) val); | |
1388 } | |
1389 if (summary) { | |
1390 gclog_or_tty->print_cr(""); | |
1391 double avg = total / (double) ParallelGCThreads; | |
1392 gclog_or_tty->print(" "); | |
1393 for (j = 0; j < level; ++j) | |
1394 gclog_or_tty->print(" "); | |
1395 gclog_or_tty->print("Sum: %d, Avg: %d, Min: %d, Max: %d", | |
1396 (int)total, (int)avg, (int)min, (int)max); | |
1397 } | |
1398 gclog_or_tty->print_cr("]"); | |
1399 } | |
1400 | |
1401 void G1CollectorPolicy::print_stats (int level, | |
1402 const char* str, | |
1403 double value) { | |
1404 for (int j = 0; j < level; ++j) | |
1405 gclog_or_tty->print(" "); | |
1406 gclog_or_tty->print_cr("[%s: %5.1lf ms]", str, value); | |
1407 } | |
1408 | |
1409 void G1CollectorPolicy::print_stats (int level, | |
1410 const char* str, | |
1411 int value) { | |
1412 for (int j = 0; j < level; ++j) | |
1413 gclog_or_tty->print(" "); | |
1414 gclog_or_tty->print_cr("[%s: %d]", str, value); | |
1415 } | |
1416 | |
1417 double G1CollectorPolicy::avg_value (double* data) { | |
1418 if (ParallelGCThreads > 0) { | |
1419 double ret = 0.0; | |
1420 for (uint i = 0; i < ParallelGCThreads; ++i) | |
1421 ret += data[i]; | |
1422 return ret / (double) ParallelGCThreads; | |
1423 } else { | |
1424 return data[0]; | |
1425 } | |
1426 } | |
1427 | |
1428 double G1CollectorPolicy::max_value (double* data) { | |
1429 if (ParallelGCThreads > 0) { | |
1430 double ret = data[0]; | |
1431 for (uint i = 1; i < ParallelGCThreads; ++i) | |
1432 if (data[i] > ret) | |
1433 ret = data[i]; | |
1434 return ret; | |
1435 } else { | |
1436 return data[0]; | |
1437 } | |
1438 } | |
1439 | |
1440 double G1CollectorPolicy::sum_of_values (double* data) { | |
1441 if (ParallelGCThreads > 0) { | |
1442 double sum = 0.0; | |
1443 for (uint i = 0; i < ParallelGCThreads; i++) | |
1444 sum += data[i]; | |
1445 return sum; | |
1446 } else { | |
1447 return data[0]; | |
1448 } | |
1449 } | |
1450 | |
1451 double G1CollectorPolicy::max_sum (double* data1, | |
1452 double* data2) { | |
1453 double ret = data1[0] + data2[0]; | |
1454 | |
1455 if (ParallelGCThreads > 0) { | |
1456 for (uint i = 1; i < ParallelGCThreads; ++i) { | |
1457 double data = data1[i] + data2[i]; | |
1458 if (data > ret) | |
1459 ret = data; | |
1460 } | |
1461 } | |
1462 return ret; | |
1463 } | |
1464 | |
1465 // Anything below that is considered to be zero | |
1466 #define MIN_TIMER_GRANULARITY 0.0000001 | |
1467 | |
1468 void G1CollectorPolicy::record_collection_pause_end(bool popular, | |
1469 bool abandoned) { | |
1470 double end_time_sec = os::elapsedTime(); | |
1471 double elapsed_ms = _last_pause_time_ms; | |
1472 bool parallel = ParallelGCThreads > 0; | |
1473 double evac_ms = (end_time_sec - _cur_G1_strong_roots_end_sec) * 1000.0; | |
1474 size_t rs_size = | |
1475 _cur_collection_pause_used_regions_at_start - collection_set_size(); | |
1476 size_t cur_used_bytes = _g1->used(); | |
1477 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
1478 bool last_pause_included_initial_mark = false; | |
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1479 bool update_stats = !abandoned && !_g1->evacuation_failed(); |
342 | 1480 |
1481 #ifndef PRODUCT | |
1482 if (G1YoungSurvRateVerbose) { | |
1483 gclog_or_tty->print_cr(""); | |
1484 _short_lived_surv_rate_group->print(); | |
1485 // do that for any other surv rate groups too | |
1486 } | |
1487 #endif // PRODUCT | |
1488 | |
1489 checkpoint_conc_overhead(); | |
1490 | |
1491 if (in_young_gc_mode()) { | |
1492 last_pause_included_initial_mark = _should_initiate_conc_mark; | |
1493 if (last_pause_included_initial_mark) | |
1494 record_concurrent_mark_init_end_pre(0.0); | |
1495 | |
1496 size_t min_used_targ = | |
1497 (_g1->capacity() / 100) * (G1SteadyStateUsed - G1SteadyStateUsedDelta); | |
1498 | |
1499 if (cur_used_bytes > min_used_targ) { | |
1500 if (cur_used_bytes <= _prev_collection_pause_used_at_end_bytes) { | |
1501 } else if (!_g1->mark_in_progress() && !_last_full_young_gc) { | |
1502 _should_initiate_conc_mark = true; | |
1503 } | |
1504 } | |
1505 | |
1506 _prev_collection_pause_used_at_end_bytes = cur_used_bytes; | |
1507 } | |
1508 | |
1509 _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0, | |
1510 end_time_sec, false); | |
1511 | |
1512 guarantee(_cur_collection_pause_used_regions_at_start >= | |
1513 collection_set_size(), | |
1514 "Negative RS size?"); | |
1515 | |
1516 // This assert is exempted when we're doing parallel collection pauses, | |
1517 // because the fragmentation caused by the parallel GC allocation buffers | |
1518 // can lead to more memory being used during collection than was used | |
1519 // before. Best leave this out until the fragmentation problem is fixed. | |
1520 // Pauses in which evacuation failed can also lead to negative | |
1521 // collections, since no space is reclaimed from a region containing an | |
1522 // object whose evacuation failed. | |
1523 // Further, we're now always doing parallel collection. But I'm still | |
1524 // leaving this here as a placeholder for a more precise assertion later. | |
1525 // (DLD, 10/05.) | |
1526 assert((true || parallel) // Always using GC LABs now. | |
1527 || _g1->evacuation_failed() | |
1528 || _cur_collection_pause_used_at_start_bytes >= cur_used_bytes, | |
1529 "Negative collection"); | |
1530 | |
1531 size_t freed_bytes = | |
1532 _cur_collection_pause_used_at_start_bytes - cur_used_bytes; | |
1533 size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; | |
1534 double survival_fraction = | |
1535 (double)surviving_bytes/ | |
1536 (double)_collection_set_bytes_used_before; | |
1537 | |
1538 _n_pauses++; | |
1539 | |
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1540 if (update_stats) { |
342 | 1541 _recent_CH_strong_roots_times_ms->add(_cur_CH_strong_roots_dur_ms); |
1542 _recent_G1_strong_roots_times_ms->add(_cur_G1_strong_roots_dur_ms); | |
1543 _recent_evac_times_ms->add(evac_ms); | |
1544 _recent_pause_times_ms->add(elapsed_ms); | |
1545 | |
1546 _recent_rs_sizes->add(rs_size); | |
1547 | |
1548 // We exempt parallel collection from this check because Alloc Buffer | |
1549 // fragmentation can produce negative collections. Same with evac | |
1550 // failure. | |
1551 // Further, we're now always doing parallel collection. But I'm still | |
1552 // leaving this here as a placeholder for a more precise assertion later. | |
1553 // (DLD, 10/05. | |
1554 assert((true || parallel) | |
1555 || _g1->evacuation_failed() | |
1556 || surviving_bytes <= _collection_set_bytes_used_before, | |
1557 "Or else negative collection!"); | |
1558 _recent_CS_bytes_used_before->add(_collection_set_bytes_used_before); | |
1559 _recent_CS_bytes_surviving->add(surviving_bytes); | |
1560 | |
1561 // this is where we update the allocation rate of the application | |
1562 double app_time_ms = | |
1563 (_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms); | |
1564 if (app_time_ms < MIN_TIMER_GRANULARITY) { | |
1565 // This usually happens due to the timer not having the required | |
1566 // granularity. Some Linuxes are the usual culprits. | |
1567 // We'll just set it to something (arbitrarily) small. | |
1568 app_time_ms = 1.0; | |
1569 } | |
1570 size_t regions_allocated = | |
1571 (_region_num_young - _prev_region_num_young) + | |
1572 (_region_num_tenured - _prev_region_num_tenured); | |
1573 double alloc_rate_ms = (double) regions_allocated / app_time_ms; | |
1574 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
1575 _prev_region_num_young = _region_num_young; | |
1576 _prev_region_num_tenured = _region_num_tenured; | |
1577 | |
1578 double interval_ms = | |
1579 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
1580 update_recent_gc_times(end_time_sec, elapsed_ms); | |
1581 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; | |
1582 assert(recent_avg_pause_time_ratio() < 1.00, "All GC?"); | |
1583 } | |
1584 | |
1585 if (G1PolicyVerbose > 1) { | |
1586 gclog_or_tty->print_cr(" Recording collection pause(%d)", _n_pauses); | |
1587 } | |
1588 | |
1589 PauseSummary* summary; | |
1590 if (!abandoned && !popular) | |
1591 summary = _non_pop_summary; | |
1592 else if (!abandoned && popular) | |
1593 summary = _pop_summary; | |
1594 else if (abandoned && !popular) | |
1595 summary = _non_pop_abandoned_summary; | |
1596 else if (abandoned && popular) | |
1597 summary = _pop_abandoned_summary; | |
1598 else | |
1599 guarantee(false, "should not get here!"); | |
1600 | |
1601 double pop_update_rs_time; | |
1602 double pop_update_rs_processed_buffers; | |
1603 double pop_scan_rs_time; | |
1604 double pop_closure_app_time; | |
1605 double pop_other_time; | |
1606 | |
1607 if (popular) { | |
1608 PopPreambleSummary* preamble_summary = summary->pop_preamble_summary(); | |
1609 guarantee(preamble_summary != NULL, "should not be null!"); | |
1610 | |
1611 pop_update_rs_time = avg_value(_pop_par_last_update_rs_times_ms); | |
1612 pop_update_rs_processed_buffers = | |
1613 sum_of_values(_pop_par_last_update_rs_processed_buffers); | |
1614 pop_scan_rs_time = avg_value(_pop_par_last_scan_rs_times_ms); | |
1615 pop_closure_app_time = avg_value(_pop_par_last_closure_app_times_ms); | |
1616 pop_other_time = _cur_popular_preamble_time_ms - | |
1617 (pop_update_rs_time + pop_scan_rs_time + pop_closure_app_time + | |
1618 _cur_popular_evac_time_ms); | |
1619 | |
1620 preamble_summary->record_pop_preamble_time_ms(_cur_popular_preamble_time_ms); | |
1621 preamble_summary->record_pop_update_rs_time_ms(pop_update_rs_time); | |
1622 preamble_summary->record_pop_scan_rs_time_ms(pop_scan_rs_time); | |
1623 preamble_summary->record_pop_closure_app_time_ms(pop_closure_app_time); | |
1624 preamble_summary->record_pop_evacuation_time_ms(_cur_popular_evac_time_ms); | |
1625 preamble_summary->record_pop_other_time_ms(pop_other_time); | |
1626 } | |
1627 | |
1628 double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); | |
1629 double mark_stack_scan_time = avg_value(_par_last_mark_stack_scan_times_ms); | |
1630 double scan_only_time = avg_value(_par_last_scan_only_times_ms); | |
1631 double scan_only_regions_scanned = | |
1632 sum_of_values(_par_last_scan_only_regions_scanned); | |
1633 double update_rs_time = avg_value(_par_last_update_rs_times_ms); | |
1634 double update_rs_processed_buffers = | |
1635 sum_of_values(_par_last_update_rs_processed_buffers); | |
1636 double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); | |
1637 double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); | |
1638 double termination_time = avg_value(_par_last_termination_times_ms); | |
1639 | |
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1640 double parallel_other_time = _cur_collection_par_time_ms - |
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1641 (update_rs_time + ext_root_scan_time + mark_stack_scan_time + |
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|
1642 scan_only_time + scan_rs_time + obj_copy_time + termination_time); |
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|
1643 if (update_stats) { |
342 | 1644 MainBodySummary* body_summary = summary->main_body_summary(); |
1645 guarantee(body_summary != NULL, "should not be null!"); | |
1646 | |
1647 if (_satb_drain_time_set) | |
1648 body_summary->record_satb_drain_time_ms(_cur_satb_drain_time_ms); | |
1649 else | |
1650 body_summary->record_satb_drain_time_ms(0.0); | |
1651 body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); | |
1652 body_summary->record_mark_stack_scan_time_ms(mark_stack_scan_time); | |
1653 body_summary->record_scan_only_time_ms(scan_only_time); | |
1654 body_summary->record_update_rs_time_ms(update_rs_time); | |
1655 body_summary->record_scan_rs_time_ms(scan_rs_time); | |
1656 body_summary->record_obj_copy_time_ms(obj_copy_time); | |
1657 if (parallel) { | |
1658 body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); | |
1659 body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); | |
1660 body_summary->record_termination_time_ms(termination_time); | |
1661 body_summary->record_parallel_other_time_ms(parallel_other_time); | |
1662 } | |
1663 body_summary->record_mark_closure_time_ms(_mark_closure_time_ms); | |
1664 } | |
1665 | |
1666 if (G1PolicyVerbose > 1) { | |
1667 gclog_or_tty->print_cr(" ET: %10.6f ms (avg: %10.6f ms)\n" | |
1668 " CH Strong: %10.6f ms (avg: %10.6f ms)\n" | |
1669 " G1 Strong: %10.6f ms (avg: %10.6f ms)\n" | |
1670 " Evac: %10.6f ms (avg: %10.6f ms)\n" | |
1671 " ET-RS: %10.6f ms (avg: %10.6f ms)\n" | |
1672 " |RS|: " SIZE_FORMAT, | |
1673 elapsed_ms, recent_avg_time_for_pauses_ms(), | |
1674 _cur_CH_strong_roots_dur_ms, recent_avg_time_for_CH_strong_ms(), | |
1675 _cur_G1_strong_roots_dur_ms, recent_avg_time_for_G1_strong_ms(), | |
1676 evac_ms, recent_avg_time_for_evac_ms(), | |
1677 scan_rs_time, | |
1678 recent_avg_time_for_pauses_ms() - | |
1679 recent_avg_time_for_G1_strong_ms(), | |
1680 rs_size); | |
1681 | |
1682 gclog_or_tty->print_cr(" Used at start: " SIZE_FORMAT"K" | |
1683 " At end " SIZE_FORMAT "K\n" | |
1684 " garbage : " SIZE_FORMAT "K" | |
1685 " of " SIZE_FORMAT "K\n" | |
1686 " survival : %6.2f%% (%6.2f%% avg)", | |
1687 _cur_collection_pause_used_at_start_bytes/K, | |
1688 _g1->used()/K, freed_bytes/K, | |
1689 _collection_set_bytes_used_before/K, | |
1690 survival_fraction*100.0, | |
1691 recent_avg_survival_fraction()*100.0); | |
1692 gclog_or_tty->print_cr(" Recent %% gc pause time: %6.2f", | |
1693 recent_avg_pause_time_ratio() * 100.0); | |
1694 } | |
1695 | |
1696 double other_time_ms = elapsed_ms; | |
1697 if (popular) | |
1698 other_time_ms -= _cur_popular_preamble_time_ms; | |
1699 | |
1700 if (!abandoned) { | |
1701 if (_satb_drain_time_set) | |
1702 other_time_ms -= _cur_satb_drain_time_ms; | |
1703 | |
1704 if (parallel) | |
1705 other_time_ms -= _cur_collection_par_time_ms + _cur_clear_ct_time_ms; | |
1706 else | |
1707 other_time_ms -= | |
1708 update_rs_time + | |
1709 ext_root_scan_time + mark_stack_scan_time + scan_only_time + | |
1710 scan_rs_time + obj_copy_time; | |
1711 } | |
1712 | |
1713 if (PrintGCDetails) { | |
1714 gclog_or_tty->print_cr("%s%s, %1.8lf secs]", | |
1715 (popular && !abandoned) ? " (popular)" : | |
1716 (!popular && abandoned) ? " (abandoned)" : | |
1717 (popular && abandoned) ? " (popular/abandoned)" : "", | |
1718 (last_pause_included_initial_mark) ? " (initial-mark)" : "", | |
1719 elapsed_ms / 1000.0); | |
1720 | |
1721 if (!abandoned) { | |
1722 if (_satb_drain_time_set) | |
1723 print_stats(1, "SATB Drain Time", _cur_satb_drain_time_ms); | |
1724 if (_last_satb_drain_processed_buffers >= 0) | |
1725 print_stats(2, "Processed Buffers", _last_satb_drain_processed_buffers); | |
1726 } | |
1727 if (popular) | |
1728 print_stats(1, "Popularity Preamble", _cur_popular_preamble_time_ms); | |
1729 if (parallel) { | |
1730 if (popular) { | |
1731 print_par_stats(2, "Update RS (Start)", _pop_par_last_update_rs_start_times_ms, false); | |
1732 print_par_stats(2, "Update RS", _pop_par_last_update_rs_times_ms); | |
1733 if (G1RSBarrierUseQueue) | |
1734 print_par_buffers(3, "Processed Buffers", | |
1735 _pop_par_last_update_rs_processed_buffers, true); | |
1736 print_par_stats(2, "Scan RS", _pop_par_last_scan_rs_times_ms); | |
1737 print_par_stats(2, "Closure app", _pop_par_last_closure_app_times_ms); | |
1738 print_stats(2, "Evacuation", _cur_popular_evac_time_ms); | |
1739 print_stats(2, "Other", pop_other_time); | |
1740 } | |
1741 if (!abandoned) { | |
1742 print_stats(1, "Parallel Time", _cur_collection_par_time_ms); | |
1743 if (!popular) { | |
1744 print_par_stats(2, "Update RS (Start)", _par_last_update_rs_start_times_ms, false); | |
1745 print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); | |
1746 if (G1RSBarrierUseQueue) | |
1747 print_par_buffers(3, "Processed Buffers", | |
1748 _par_last_update_rs_processed_buffers, true); | |
1749 } | |
1750 print_par_stats(2, "Ext Root Scanning", _par_last_ext_root_scan_times_ms); | |
1751 print_par_stats(2, "Mark Stack Scanning", _par_last_mark_stack_scan_times_ms); | |
1752 print_par_stats(2, "Scan-Only Scanning", _par_last_scan_only_times_ms); | |
1753 print_par_buffers(3, "Scan-Only Regions", | |
1754 _par_last_scan_only_regions_scanned, true); | |
1755 print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms); | |
1756 print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms); | |
1757 print_par_stats(2, "Termination", _par_last_termination_times_ms); | |
1758 print_stats(2, "Other", parallel_other_time); | |
1759 print_stats(1, "Clear CT", _cur_clear_ct_time_ms); | |
1760 } | |
1761 } else { | |
1762 if (popular) { | |
1763 print_stats(2, "Update RS", pop_update_rs_time); | |
1764 if (G1RSBarrierUseQueue) | |
1765 print_stats(3, "Processed Buffers", | |
1766 (int)pop_update_rs_processed_buffers); | |
1767 print_stats(2, "Scan RS", pop_scan_rs_time); | |
1768 print_stats(2, "Closure App", pop_closure_app_time); | |
1769 print_stats(2, "Evacuation", _cur_popular_evac_time_ms); | |
1770 print_stats(2, "Other", pop_other_time); | |
1771 } | |
1772 if (!abandoned) { | |
1773 if (!popular) { | |
1774 print_stats(1, "Update RS", update_rs_time); | |
1775 if (G1RSBarrierUseQueue) | |
1776 print_stats(2, "Processed Buffers", | |
1777 (int)update_rs_processed_buffers); | |
1778 } | |
1779 print_stats(1, "Ext Root Scanning", ext_root_scan_time); | |
1780 print_stats(1, "Mark Stack Scanning", mark_stack_scan_time); | |
1781 print_stats(1, "Scan-Only Scanning", scan_only_time); | |
1782 print_stats(1, "Scan RS", scan_rs_time); | |
1783 print_stats(1, "Object Copying", obj_copy_time); | |
1784 } | |
1785 } | |
1786 print_stats(1, "Other", other_time_ms); | |
1787 for (int i = 0; i < _aux_num; ++i) { | |
1788 if (_cur_aux_times_set[i]) { | |
1789 char buffer[96]; | |
1790 sprintf(buffer, "Aux%d", i); | |
1791 print_stats(1, buffer, _cur_aux_times_ms[i]); | |
1792 } | |
1793 } | |
1794 } | |
1795 if (PrintGCDetails) | |
1796 gclog_or_tty->print(" ["); | |
1797 if (PrintGC || PrintGCDetails) | |
1798 _g1->print_size_transition(gclog_or_tty, | |
1799 _cur_collection_pause_used_at_start_bytes, | |
1800 _g1->used(), _g1->capacity()); | |
1801 if (PrintGCDetails) | |
1802 gclog_or_tty->print_cr("]"); | |
1803 | |
1804 _all_pause_times_ms->add(elapsed_ms); | |
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1805 if (update_stats) { |
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1806 summary->record_total_time_ms(elapsed_ms); |
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1807 summary->record_other_time_ms(other_time_ms); |
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1808 } |
342 | 1809 for (int i = 0; i < _aux_num; ++i) |
1810 if (_cur_aux_times_set[i]) | |
1811 _all_aux_times_ms[i].add(_cur_aux_times_ms[i]); | |
1812 | |
1813 // Reset marks-between-pauses counter. | |
1814 _n_marks_since_last_pause = 0; | |
1815 | |
1816 // Update the efficiency-since-mark vars. | |
1817 double proc_ms = elapsed_ms * (double) _parallel_gc_threads; | |
1818 if (elapsed_ms < MIN_TIMER_GRANULARITY) { | |
1819 // This usually happens due to the timer not having the required | |
1820 // granularity. Some Linuxes are the usual culprits. | |
1821 // We'll just set it to something (arbitrarily) small. | |
1822 proc_ms = 1.0; | |
1823 } | |
1824 double cur_efficiency = (double) freed_bytes / proc_ms; | |
1825 | |
1826 bool new_in_marking_window = _in_marking_window; | |
1827 bool new_in_marking_window_im = false; | |
1828 if (_should_initiate_conc_mark) { | |
1829 new_in_marking_window = true; | |
1830 new_in_marking_window_im = true; | |
1831 } | |
1832 | |
1833 if (in_young_gc_mode()) { | |
1834 if (_last_full_young_gc) { | |
1835 set_full_young_gcs(false); | |
1836 _last_full_young_gc = false; | |
1837 } | |
1838 | |
1839 if ( !_last_young_gc_full ) { | |
1840 if ( _should_revert_to_full_young_gcs || | |
1841 _known_garbage_ratio < 0.05 || | |
1842 (adaptive_young_list_length() && | |
1843 (get_gc_eff_factor() * cur_efficiency < predict_young_gc_eff())) ) { | |
1844 set_full_young_gcs(true); | |
1845 } | |
1846 } | |
1847 _should_revert_to_full_young_gcs = false; | |
1848 | |
1849 if (_last_young_gc_full && !_during_marking) | |
1850 _young_gc_eff_seq->add(cur_efficiency); | |
1851 } | |
1852 | |
1853 _short_lived_surv_rate_group->start_adding_regions(); | |
1854 // do that for any other surv rate groupsx | |
1855 | |
1856 // <NEW PREDICTION> | |
1857 | |
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1858 if (!popular && update_stats) { |
342 | 1859 double pause_time_ms = elapsed_ms; |
1860 | |
1861 size_t diff = 0; | |
1862 if (_max_pending_cards >= _pending_cards) | |
1863 diff = _max_pending_cards - _pending_cards; | |
1864 _pending_card_diff_seq->add((double) diff); | |
1865 | |
1866 double cost_per_card_ms = 0.0; | |
1867 if (_pending_cards > 0) { | |
1868 cost_per_card_ms = update_rs_time / (double) _pending_cards; | |
1869 _cost_per_card_ms_seq->add(cost_per_card_ms); | |
1870 } | |
1871 | |
1872 double cost_per_scan_only_region_ms = 0.0; | |
1873 if (scan_only_regions_scanned > 0.0) { | |
1874 cost_per_scan_only_region_ms = | |
1875 scan_only_time / scan_only_regions_scanned; | |
1876 if (_in_marking_window_im) | |
1877 _cost_per_scan_only_region_ms_during_cm_seq->add(cost_per_scan_only_region_ms); | |
1878 else | |
1879 _cost_per_scan_only_region_ms_seq->add(cost_per_scan_only_region_ms); | |
1880 } | |
1881 | |
1882 size_t cards_scanned = _g1->cards_scanned(); | |
1883 | |
1884 double cost_per_entry_ms = 0.0; | |
1885 if (cards_scanned > 10) { | |
1886 cost_per_entry_ms = scan_rs_time / (double) cards_scanned; | |
1887 if (_last_young_gc_full) | |
1888 _cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1889 else | |
1890 _partially_young_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1891 } | |
1892 | |
1893 if (_max_rs_lengths > 0) { | |
1894 double cards_per_entry_ratio = | |
1895 (double) cards_scanned / (double) _max_rs_lengths; | |
1896 if (_last_young_gc_full) | |
1897 _fully_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1898 else | |
1899 _partially_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1900 } | |
1901 | |
1902 size_t rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; | |
1903 if (rs_length_diff >= 0) | |
1904 _rs_length_diff_seq->add((double) rs_length_diff); | |
1905 | |
1906 size_t copied_bytes = surviving_bytes; | |
1907 double cost_per_byte_ms = 0.0; | |
1908 if (copied_bytes > 0) { | |
1909 cost_per_byte_ms = obj_copy_time / (double) copied_bytes; | |
1910 if (_in_marking_window) | |
1911 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); | |
1912 else | |
1913 _cost_per_byte_ms_seq->add(cost_per_byte_ms); | |
1914 } | |
1915 | |
1916 double all_other_time_ms = pause_time_ms - | |
1917 (update_rs_time + scan_only_time + scan_rs_time + obj_copy_time + | |
1918 _mark_closure_time_ms + termination_time); | |
1919 | |
1920 double young_other_time_ms = 0.0; | |
1921 if (_recorded_young_regions > 0) { | |
1922 young_other_time_ms = | |
1923 _recorded_young_cset_choice_time_ms + | |
1924 _recorded_young_free_cset_time_ms; | |
1925 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / | |
1926 (double) _recorded_young_regions); | |
1927 } | |
1928 double non_young_other_time_ms = 0.0; | |
1929 if (_recorded_non_young_regions > 0) { | |
1930 non_young_other_time_ms = | |
1931 _recorded_non_young_cset_choice_time_ms + | |
1932 _recorded_non_young_free_cset_time_ms; | |
1933 | |
1934 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
1935 (double) _recorded_non_young_regions); | |
1936 } | |
1937 | |
1938 double constant_other_time_ms = all_other_time_ms - | |
1939 (young_other_time_ms + non_young_other_time_ms); | |
1940 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
1941 | |
1942 double survival_ratio = 0.0; | |
1943 if (_bytes_in_collection_set_before_gc > 0) { | |
1944 survival_ratio = (double) bytes_in_to_space_during_gc() / | |
1945 (double) _bytes_in_collection_set_before_gc; | |
1946 } | |
1947 | |
1948 _pending_cards_seq->add((double) _pending_cards); | |
1949 _scanned_cards_seq->add((double) cards_scanned); | |
1950 _rs_lengths_seq->add((double) _max_rs_lengths); | |
1951 | |
1952 double expensive_region_limit_ms = | |
1953 (double) G1MaxPauseTimeMS - predict_constant_other_time_ms(); | |
1954 if (expensive_region_limit_ms < 0.0) { | |
1955 // this means that the other time was predicted to be longer than | |
1956 // than the max pause time | |
1957 expensive_region_limit_ms = (double) G1MaxPauseTimeMS; | |
1958 } | |
1959 _expensive_region_limit_ms = expensive_region_limit_ms; | |
1960 | |
1961 if (PREDICTIONS_VERBOSE) { | |
1962 gclog_or_tty->print_cr(""); | |
1963 gclog_or_tty->print_cr("PREDICTIONS %1.4lf %d " | |
1964 "REGIONS %d %d %d %d " | |
1965 "PENDING_CARDS %d %d " | |
1966 "CARDS_SCANNED %d %d " | |
1967 "RS_LENGTHS %d %d " | |
1968 "SCAN_ONLY_SCAN %1.6lf %1.6lf " | |
1969 "RS_UPDATE %1.6lf %1.6lf RS_SCAN %1.6lf %1.6lf " | |
1970 "SURVIVAL_RATIO %1.6lf %1.6lf " | |
1971 "OBJECT_COPY %1.6lf %1.6lf OTHER_CONSTANT %1.6lf %1.6lf " | |
1972 "OTHER_YOUNG %1.6lf %1.6lf " | |
1973 "OTHER_NON_YOUNG %1.6lf %1.6lf " | |
1974 "VTIME_DIFF %1.6lf TERMINATION %1.6lf " | |
1975 "ELAPSED %1.6lf %1.6lf ", | |
1976 _cur_collection_start_sec, | |
1977 (!_last_young_gc_full) ? 2 : | |
1978 (last_pause_included_initial_mark) ? 1 : 0, | |
1979 _recorded_region_num, | |
1980 _recorded_young_regions, | |
1981 _recorded_scan_only_regions, | |
1982 _recorded_non_young_regions, | |
1983 _predicted_pending_cards, _pending_cards, | |
1984 _predicted_cards_scanned, cards_scanned, | |
1985 _predicted_rs_lengths, _max_rs_lengths, | |
1986 _predicted_scan_only_scan_time_ms, scan_only_time, | |
1987 _predicted_rs_update_time_ms, update_rs_time, | |
1988 _predicted_rs_scan_time_ms, scan_rs_time, | |
1989 _predicted_survival_ratio, survival_ratio, | |
1990 _predicted_object_copy_time_ms, obj_copy_time, | |
1991 _predicted_constant_other_time_ms, constant_other_time_ms, | |
1992 _predicted_young_other_time_ms, young_other_time_ms, | |
1993 _predicted_non_young_other_time_ms, | |
1994 non_young_other_time_ms, | |
1995 _vtime_diff_ms, termination_time, | |
1996 _predicted_pause_time_ms, elapsed_ms); | |
1997 } | |
1998 | |
1999 if (G1PolicyVerbose > 0) { | |
2000 gclog_or_tty->print_cr("Pause Time, predicted: %1.4lfms (predicted %s), actual: %1.4lfms", | |
2001 _predicted_pause_time_ms, | |
2002 (_within_target) ? "within" : "outside", | |
2003 elapsed_ms); | |
2004 } | |
2005 | |
2006 } | |
2007 | |
2008 _in_marking_window = new_in_marking_window; | |
2009 _in_marking_window_im = new_in_marking_window_im; | |
2010 _free_regions_at_end_of_collection = _g1->free_regions(); | |
2011 _scan_only_regions_at_end_of_collection = _g1->young_list_length(); | |
2012 calculate_young_list_min_length(); | |
2013 calculate_young_list_target_config(); | |
2014 | |
2015 // </NEW PREDICTION> | |
2016 | |
2017 _target_pause_time_ms = -1.0; | |
2018 } | |
2019 | |
2020 // <NEW PREDICTION> | |
2021 | |
2022 double | |
2023 G1CollectorPolicy:: | |
2024 predict_young_collection_elapsed_time_ms(size_t adjustment) { | |
2025 guarantee( adjustment == 0 || adjustment == 1, "invariant" ); | |
2026 | |
2027 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
2028 size_t young_num = g1h->young_list_length(); | |
2029 if (young_num == 0) | |
2030 return 0.0; | |
2031 | |
2032 young_num += adjustment; | |
2033 size_t pending_cards = predict_pending_cards(); | |
2034 size_t rs_lengths = g1h->young_list_sampled_rs_lengths() + | |
2035 predict_rs_length_diff(); | |
2036 size_t card_num; | |
2037 if (full_young_gcs()) | |
2038 card_num = predict_young_card_num(rs_lengths); | |
2039 else | |
2040 card_num = predict_non_young_card_num(rs_lengths); | |
2041 size_t young_byte_size = young_num * HeapRegion::GrainBytes; | |
2042 double accum_yg_surv_rate = | |
2043 _short_lived_surv_rate_group->accum_surv_rate(adjustment); | |
2044 | |
2045 size_t bytes_to_copy = | |
2046 (size_t) (accum_yg_surv_rate * (double) HeapRegion::GrainBytes); | |
2047 | |
2048 return | |
2049 predict_rs_update_time_ms(pending_cards) + | |
2050 predict_rs_scan_time_ms(card_num) + | |
2051 predict_object_copy_time_ms(bytes_to_copy) + | |
2052 predict_young_other_time_ms(young_num) + | |
2053 predict_constant_other_time_ms(); | |
2054 } | |
2055 | |
2056 double | |
2057 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { | |
2058 size_t rs_length = predict_rs_length_diff(); | |
2059 size_t card_num; | |
2060 if (full_young_gcs()) | |
2061 card_num = predict_young_card_num(rs_length); | |
2062 else | |
2063 card_num = predict_non_young_card_num(rs_length); | |
2064 return predict_base_elapsed_time_ms(pending_cards, card_num); | |
2065 } | |
2066 | |
2067 double | |
2068 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
2069 size_t scanned_cards) { | |
2070 return | |
2071 predict_rs_update_time_ms(pending_cards) + | |
2072 predict_rs_scan_time_ms(scanned_cards) + | |
2073 predict_constant_other_time_ms(); | |
2074 } | |
2075 | |
2076 double | |
2077 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
2078 bool young) { | |
2079 size_t rs_length = hr->rem_set()->occupied(); | |
2080 size_t card_num; | |
2081 if (full_young_gcs()) | |
2082 card_num = predict_young_card_num(rs_length); | |
2083 else | |
2084 card_num = predict_non_young_card_num(rs_length); | |
2085 size_t bytes_to_copy = predict_bytes_to_copy(hr); | |
2086 | |
2087 double region_elapsed_time_ms = | |
2088 predict_rs_scan_time_ms(card_num) + | |
2089 predict_object_copy_time_ms(bytes_to_copy); | |
2090 | |
2091 if (young) | |
2092 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
2093 else | |
2094 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
2095 | |
2096 return region_elapsed_time_ms; | |
2097 } | |
2098 | |
2099 size_t | |
2100 G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { | |
2101 size_t bytes_to_copy; | |
2102 if (hr->is_marked()) | |
2103 bytes_to_copy = hr->max_live_bytes(); | |
2104 else { | |
2105 guarantee( hr->is_young() && hr->age_in_surv_rate_group() != -1, | |
2106 "invariant" ); | |
2107 int age = hr->age_in_surv_rate_group(); | |
545 | 2108 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
342 | 2109 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
2110 } | |
2111 | |
2112 return bytes_to_copy; | |
2113 } | |
2114 | |
2115 void | |
2116 G1CollectorPolicy::start_recording_regions() { | |
2117 _recorded_rs_lengths = 0; | |
2118 _recorded_scan_only_regions = 0; | |
2119 _recorded_young_regions = 0; | |
2120 _recorded_non_young_regions = 0; | |
2121 | |
2122 #if PREDICTIONS_VERBOSE | |
2123 _predicted_rs_lengths = 0; | |
2124 _predicted_cards_scanned = 0; | |
2125 | |
2126 _recorded_marked_bytes = 0; | |
2127 _recorded_young_bytes = 0; | |
2128 _predicted_bytes_to_copy = 0; | |
2129 #endif // PREDICTIONS_VERBOSE | |
2130 } | |
2131 | |
2132 void | |
2133 G1CollectorPolicy::record_cset_region(HeapRegion* hr, bool young) { | |
2134 if (young) { | |
2135 ++_recorded_young_regions; | |
2136 } else { | |
2137 ++_recorded_non_young_regions; | |
2138 } | |
2139 #if PREDICTIONS_VERBOSE | |
2140 if (young) { | |
545 | 2141 _recorded_young_bytes += hr->used(); |
342 | 2142 } else { |
2143 _recorded_marked_bytes += hr->max_live_bytes(); | |
2144 } | |
2145 _predicted_bytes_to_copy += predict_bytes_to_copy(hr); | |
2146 #endif // PREDICTIONS_VERBOSE | |
2147 | |
2148 size_t rs_length = hr->rem_set()->occupied(); | |
2149 _recorded_rs_lengths += rs_length; | |
2150 } | |
2151 | |
2152 void | |
2153 G1CollectorPolicy::record_scan_only_regions(size_t scan_only_length) { | |
2154 _recorded_scan_only_regions = scan_only_length; | |
2155 } | |
2156 | |
2157 void | |
2158 G1CollectorPolicy::end_recording_regions() { | |
2159 #if PREDICTIONS_VERBOSE | |
2160 _predicted_pending_cards = predict_pending_cards(); | |
2161 _predicted_rs_lengths = _recorded_rs_lengths + predict_rs_length_diff(); | |
2162 if (full_young_gcs()) | |
2163 _predicted_cards_scanned += predict_young_card_num(_predicted_rs_lengths); | |
2164 else | |
2165 _predicted_cards_scanned += | |
2166 predict_non_young_card_num(_predicted_rs_lengths); | |
2167 _recorded_region_num = _recorded_young_regions + _recorded_non_young_regions; | |
2168 | |
2169 _predicted_scan_only_scan_time_ms = | |
2170 predict_scan_only_time_ms(_recorded_scan_only_regions); | |
2171 _predicted_rs_update_time_ms = | |
2172 predict_rs_update_time_ms(_g1->pending_card_num()); | |
2173 _predicted_rs_scan_time_ms = | |
2174 predict_rs_scan_time_ms(_predicted_cards_scanned); | |
2175 _predicted_object_copy_time_ms = | |
2176 predict_object_copy_time_ms(_predicted_bytes_to_copy); | |
2177 _predicted_constant_other_time_ms = | |
2178 predict_constant_other_time_ms(); | |
2179 _predicted_young_other_time_ms = | |
2180 predict_young_other_time_ms(_recorded_young_regions); | |
2181 _predicted_non_young_other_time_ms = | |
2182 predict_non_young_other_time_ms(_recorded_non_young_regions); | |
2183 | |
2184 _predicted_pause_time_ms = | |
2185 _predicted_scan_only_scan_time_ms + | |
2186 _predicted_rs_update_time_ms + | |
2187 _predicted_rs_scan_time_ms + | |
2188 _predicted_object_copy_time_ms + | |
2189 _predicted_constant_other_time_ms + | |
2190 _predicted_young_other_time_ms + | |
2191 _predicted_non_young_other_time_ms; | |
2192 #endif // PREDICTIONS_VERBOSE | |
2193 } | |
2194 | |
2195 void G1CollectorPolicy::check_if_region_is_too_expensive(double | |
2196 predicted_time_ms) { | |
2197 // I don't think we need to do this when in young GC mode since | |
2198 // marking will be initiated next time we hit the soft limit anyway... | |
2199 if (predicted_time_ms > _expensive_region_limit_ms) { | |
2200 if (!in_young_gc_mode()) { | |
2201 set_full_young_gcs(true); | |
2202 _should_initiate_conc_mark = true; | |
2203 } else | |
2204 // no point in doing another partial one | |
2205 _should_revert_to_full_young_gcs = true; | |
2206 } | |
2207 } | |
2208 | |
2209 // </NEW PREDICTION> | |
2210 | |
2211 | |
2212 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, | |
2213 double elapsed_ms) { | |
2214 _recent_gc_times_ms->add(elapsed_ms); | |
2215 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
2216 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
2217 } | |
2218 | |
2219 double G1CollectorPolicy::recent_avg_time_for_pauses_ms() { | |
2220 if (_recent_pause_times_ms->num() == 0) return (double) G1MaxPauseTimeMS; | |
2221 else return _recent_pause_times_ms->avg(); | |
2222 } | |
2223 | |
2224 double G1CollectorPolicy::recent_avg_time_for_CH_strong_ms() { | |
2225 if (_recent_CH_strong_roots_times_ms->num() == 0) | |
2226 return (double)G1MaxPauseTimeMS/3.0; | |
2227 else return _recent_CH_strong_roots_times_ms->avg(); | |
2228 } | |
2229 | |
2230 double G1CollectorPolicy::recent_avg_time_for_G1_strong_ms() { | |
2231 if (_recent_G1_strong_roots_times_ms->num() == 0) | |
2232 return (double)G1MaxPauseTimeMS/3.0; | |
2233 else return _recent_G1_strong_roots_times_ms->avg(); | |
2234 } | |
2235 | |
2236 double G1CollectorPolicy::recent_avg_time_for_evac_ms() { | |
2237 if (_recent_evac_times_ms->num() == 0) return (double)G1MaxPauseTimeMS/3.0; | |
2238 else return _recent_evac_times_ms->avg(); | |
2239 } | |
2240 | |
2241 int G1CollectorPolicy::number_of_recent_gcs() { | |
2242 assert(_recent_CH_strong_roots_times_ms->num() == | |
2243 _recent_G1_strong_roots_times_ms->num(), "Sequence out of sync"); | |
2244 assert(_recent_G1_strong_roots_times_ms->num() == | |
2245 _recent_evac_times_ms->num(), "Sequence out of sync"); | |
2246 assert(_recent_evac_times_ms->num() == | |
2247 _recent_pause_times_ms->num(), "Sequence out of sync"); | |
2248 assert(_recent_pause_times_ms->num() == | |
2249 _recent_CS_bytes_used_before->num(), "Sequence out of sync"); | |
2250 assert(_recent_CS_bytes_used_before->num() == | |
2251 _recent_CS_bytes_surviving->num(), "Sequence out of sync"); | |
2252 return _recent_pause_times_ms->num(); | |
2253 } | |
2254 | |
2255 double G1CollectorPolicy::recent_avg_survival_fraction() { | |
2256 return recent_avg_survival_fraction_work(_recent_CS_bytes_surviving, | |
2257 _recent_CS_bytes_used_before); | |
2258 } | |
2259 | |
2260 double G1CollectorPolicy::last_survival_fraction() { | |
2261 return last_survival_fraction_work(_recent_CS_bytes_surviving, | |
2262 _recent_CS_bytes_used_before); | |
2263 } | |
2264 | |
2265 double | |
2266 G1CollectorPolicy::recent_avg_survival_fraction_work(TruncatedSeq* surviving, | |
2267 TruncatedSeq* before) { | |
2268 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
2269 if (before->sum() > 0.0) { | |
2270 double recent_survival_rate = surviving->sum() / before->sum(); | |
2271 // We exempt parallel collection from this check because Alloc Buffer | |
2272 // fragmentation can produce negative collections. | |
2273 // Further, we're now always doing parallel collection. But I'm still | |
2274 // leaving this here as a placeholder for a more precise assertion later. | |
2275 // (DLD, 10/05.) | |
2276 assert((true || ParallelGCThreads > 0) || | |
2277 _g1->evacuation_failed() || | |
2278 recent_survival_rate <= 1.0, "Or bad frac"); | |
2279 return recent_survival_rate; | |
2280 } else { | |
2281 return 1.0; // Be conservative. | |
2282 } | |
2283 } | |
2284 | |
2285 double | |
2286 G1CollectorPolicy::last_survival_fraction_work(TruncatedSeq* surviving, | |
2287 TruncatedSeq* before) { | |
2288 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
2289 if (surviving->num() > 0 && before->last() > 0.0) { | |
2290 double last_survival_rate = surviving->last() / before->last(); | |
2291 // We exempt parallel collection from this check because Alloc Buffer | |
2292 // fragmentation can produce negative collections. | |
2293 // Further, we're now always doing parallel collection. But I'm still | |
2294 // leaving this here as a placeholder for a more precise assertion later. | |
2295 // (DLD, 10/05.) | |
2296 assert((true || ParallelGCThreads > 0) || | |
2297 last_survival_rate <= 1.0, "Or bad frac"); | |
2298 return last_survival_rate; | |
2299 } else { | |
2300 return 1.0; | |
2301 } | |
2302 } | |
2303 | |
2304 static const int survival_min_obs = 5; | |
2305 static double survival_min_obs_limits[] = { 0.9, 0.7, 0.5, 0.3, 0.1 }; | |
2306 static const double min_survival_rate = 0.1; | |
2307 | |
2308 double | |
2309 G1CollectorPolicy::conservative_avg_survival_fraction_work(double avg, | |
2310 double latest) { | |
2311 double res = avg; | |
2312 if (number_of_recent_gcs() < survival_min_obs) { | |
2313 res = MAX2(res, survival_min_obs_limits[number_of_recent_gcs()]); | |
2314 } | |
2315 res = MAX2(res, latest); | |
2316 res = MAX2(res, min_survival_rate); | |
2317 // In the parallel case, LAB fragmentation can produce "negative | |
2318 // collections"; so can evac failure. Cap at 1.0 | |
2319 res = MIN2(res, 1.0); | |
2320 return res; | |
2321 } | |
2322 | |
2323 size_t G1CollectorPolicy::expansion_amount() { | |
2324 if ((int)(recent_avg_pause_time_ratio() * 100.0) > G1GCPct) { | |
2325 // We will double the existing space, or take G1ExpandByPctOfAvail % of | |
2326 // the available expansion space, whichever is smaller, bounded below | |
2327 // by a minimum expansion (unless that's all that's left.) | |
2328 const size_t min_expand_bytes = 1*M; | |
2329 size_t reserved_bytes = _g1->g1_reserved_obj_bytes(); | |
2330 size_t committed_bytes = _g1->capacity(); | |
2331 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
2332 size_t expand_bytes; | |
2333 size_t expand_bytes_via_pct = | |
2334 uncommitted_bytes * G1ExpandByPctOfAvail / 100; | |
2335 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); | |
2336 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
2337 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
2338 if (G1PolicyVerbose > 1) { | |
2339 gclog_or_tty->print("Decided to expand: ratio = %5.2f, " | |
2340 "committed = %d%s, uncommited = %d%s, via pct = %d%s.\n" | |
2341 " Answer = %d.\n", | |
2342 recent_avg_pause_time_ratio(), | |
2343 byte_size_in_proper_unit(committed_bytes), | |
2344 proper_unit_for_byte_size(committed_bytes), | |
2345 byte_size_in_proper_unit(uncommitted_bytes), | |
2346 proper_unit_for_byte_size(uncommitted_bytes), | |
2347 byte_size_in_proper_unit(expand_bytes_via_pct), | |
2348 proper_unit_for_byte_size(expand_bytes_via_pct), | |
2349 byte_size_in_proper_unit(expand_bytes), | |
2350 proper_unit_for_byte_size(expand_bytes)); | |
2351 } | |
2352 return expand_bytes; | |
2353 } else { | |
2354 return 0; | |
2355 } | |
2356 } | |
2357 | |
2358 void G1CollectorPolicy::note_start_of_mark_thread() { | |
2359 _mark_thread_startup_sec = os::elapsedTime(); | |
2360 } | |
2361 | |
2362 class CountCSClosure: public HeapRegionClosure { | |
2363 G1CollectorPolicy* _g1_policy; | |
2364 public: | |
2365 CountCSClosure(G1CollectorPolicy* g1_policy) : | |
2366 _g1_policy(g1_policy) {} | |
2367 bool doHeapRegion(HeapRegion* r) { | |
2368 _g1_policy->_bytes_in_collection_set_before_gc += r->used(); | |
2369 return false; | |
2370 } | |
2371 }; | |
2372 | |
2373 void G1CollectorPolicy::count_CS_bytes_used() { | |
2374 CountCSClosure cs_closure(this); | |
2375 _g1->collection_set_iterate(&cs_closure); | |
2376 } | |
2377 | |
2378 static void print_indent(int level) { | |
2379 for (int j = 0; j < level+1; ++j) | |
2380 gclog_or_tty->print(" "); | |
2381 } | |
2382 | |
2383 void G1CollectorPolicy::print_summary (int level, | |
2384 const char* str, | |
2385 NumberSeq* seq) const { | |
2386 double sum = seq->sum(); | |
2387 print_indent(level); | |
2388 gclog_or_tty->print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", | |
2389 str, sum / 1000.0, seq->avg()); | |
2390 } | |
2391 | |
2392 void G1CollectorPolicy::print_summary_sd (int level, | |
2393 const char* str, | |
2394 NumberSeq* seq) const { | |
2395 print_summary(level, str, seq); | |
2396 print_indent(level + 5); | |
2397 gclog_or_tty->print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", | |
2398 seq->num(), seq->sd(), seq->maximum()); | |
2399 } | |
2400 | |
2401 void G1CollectorPolicy::check_other_times(int level, | |
2402 NumberSeq* other_times_ms, | |
2403 NumberSeq* calc_other_times_ms) const { | |
2404 bool should_print = false; | |
2405 | |
2406 double max_sum = MAX2(fabs(other_times_ms->sum()), | |
2407 fabs(calc_other_times_ms->sum())); | |
2408 double min_sum = MIN2(fabs(other_times_ms->sum()), | |
2409 fabs(calc_other_times_ms->sum())); | |
2410 double sum_ratio = max_sum / min_sum; | |
2411 if (sum_ratio > 1.1) { | |
2412 should_print = true; | |
2413 print_indent(level + 1); | |
2414 gclog_or_tty->print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); | |
2415 } | |
2416 | |
2417 double max_avg = MAX2(fabs(other_times_ms->avg()), | |
2418 fabs(calc_other_times_ms->avg())); | |
2419 double min_avg = MIN2(fabs(other_times_ms->avg()), | |
2420 fabs(calc_other_times_ms->avg())); | |
2421 double avg_ratio = max_avg / min_avg; | |
2422 if (avg_ratio > 1.1) { | |
2423 should_print = true; | |
2424 print_indent(level + 1); | |
2425 gclog_or_tty->print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); | |
2426 } | |
2427 | |
2428 if (other_times_ms->sum() < -0.01) { | |
2429 print_indent(level + 1); | |
2430 gclog_or_tty->print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); | |
2431 } | |
2432 | |
2433 if (other_times_ms->avg() < -0.01) { | |
2434 print_indent(level + 1); | |
2435 gclog_or_tty->print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); | |
2436 } | |
2437 | |
2438 if (calc_other_times_ms->sum() < -0.01) { | |
2439 should_print = true; | |
2440 print_indent(level + 1); | |
2441 gclog_or_tty->print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); | |
2442 } | |
2443 | |
2444 if (calc_other_times_ms->avg() < -0.01) { | |
2445 should_print = true; | |
2446 print_indent(level + 1); | |
2447 gclog_or_tty->print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); | |
2448 } | |
2449 | |
2450 if (should_print) | |
2451 print_summary(level, "Other(Calc)", calc_other_times_ms); | |
2452 } | |
2453 | |
2454 void G1CollectorPolicy::print_summary(PauseSummary* summary) const { | |
2455 bool parallel = ParallelGCThreads > 0; | |
2456 MainBodySummary* body_summary = summary->main_body_summary(); | |
2457 PopPreambleSummary* preamble_summary = summary->pop_preamble_summary(); | |
2458 | |
2459 if (summary->get_total_seq()->num() > 0) { | |
2460 print_summary_sd(0, | |
2461 (preamble_summary == NULL) ? "Non-Popular Pauses" : | |
2462 "Popular Pauses", | |
2463 summary->get_total_seq()); | |
2464 if (preamble_summary != NULL) { | |
2465 print_summary(1, "Popularity Preamble", | |
2466 preamble_summary->get_pop_preamble_seq()); | |
2467 print_summary(2, "Update RS", preamble_summary->get_pop_update_rs_seq()); | |
2468 print_summary(2, "Scan RS", preamble_summary->get_pop_scan_rs_seq()); | |
2469 print_summary(2, "Closure App", | |
2470 preamble_summary->get_pop_closure_app_seq()); | |
2471 print_summary(2, "Evacuation", | |
2472 preamble_summary->get_pop_evacuation_seq()); | |
2473 print_summary(2, "Other", preamble_summary->get_pop_other_seq()); | |
2474 { | |
2475 NumberSeq* other_parts[] = { | |
2476 preamble_summary->get_pop_update_rs_seq(), | |
2477 preamble_summary->get_pop_scan_rs_seq(), | |
2478 preamble_summary->get_pop_closure_app_seq(), | |
2479 preamble_summary->get_pop_evacuation_seq() | |
2480 }; | |
2481 NumberSeq calc_other_times_ms(preamble_summary->get_pop_preamble_seq(), | |
2482 4, other_parts); | |
2483 check_other_times(2, preamble_summary->get_pop_other_seq(), | |
2484 &calc_other_times_ms); | |
2485 } | |
2486 } | |
2487 if (body_summary != NULL) { | |
2488 print_summary(1, "SATB Drain", body_summary->get_satb_drain_seq()); | |
2489 if (parallel) { | |
2490 print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); | |
2491 print_summary(2, "Update RS", body_summary->get_update_rs_seq()); | |
2492 print_summary(2, "Ext Root Scanning", | |
2493 body_summary->get_ext_root_scan_seq()); | |
2494 print_summary(2, "Mark Stack Scanning", | |
2495 body_summary->get_mark_stack_scan_seq()); | |
2496 print_summary(2, "Scan-Only Scanning", | |
2497 body_summary->get_scan_only_seq()); | |
2498 print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); | |
2499 print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); | |
2500 print_summary(2, "Termination", body_summary->get_termination_seq()); | |
2501 print_summary(2, "Other", body_summary->get_parallel_other_seq()); | |
2502 { | |
2503 NumberSeq* other_parts[] = { | |
2504 body_summary->get_update_rs_seq(), | |
2505 body_summary->get_ext_root_scan_seq(), | |
2506 body_summary->get_mark_stack_scan_seq(), | |
2507 body_summary->get_scan_only_seq(), | |
2508 body_summary->get_scan_rs_seq(), | |
2509 body_summary->get_obj_copy_seq(), | |
2510 body_summary->get_termination_seq() | |
2511 }; | |
2512 NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), | |
2513 7, other_parts); | |
2514 check_other_times(2, body_summary->get_parallel_other_seq(), | |
2515 &calc_other_times_ms); | |
2516 } | |
2517 print_summary(1, "Mark Closure", body_summary->get_mark_closure_seq()); | |
2518 print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); | |
2519 } else { | |
2520 print_summary(1, "Update RS", body_summary->get_update_rs_seq()); | |
2521 print_summary(1, "Ext Root Scanning", | |
2522 body_summary->get_ext_root_scan_seq()); | |
2523 print_summary(1, "Mark Stack Scanning", | |
2524 body_summary->get_mark_stack_scan_seq()); | |
2525 print_summary(1, "Scan-Only Scanning", | |
2526 body_summary->get_scan_only_seq()); | |
2527 print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); | |
2528 print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); | |
2529 } | |
2530 } | |
2531 print_summary(1, "Other", summary->get_other_seq()); | |
2532 { | |
2533 NumberSeq calc_other_times_ms; | |
2534 if (body_summary != NULL) { | |
2535 // not abandoned | |
2536 if (parallel) { | |
2537 // parallel | |
2538 NumberSeq* other_parts[] = { | |
2539 body_summary->get_satb_drain_seq(), | |
2540 (preamble_summary == NULL) ? NULL : | |
2541 preamble_summary->get_pop_preamble_seq(), | |
2542 body_summary->get_parallel_seq(), | |
2543 body_summary->get_clear_ct_seq() | |
2544 }; | |
2545 calc_other_times_ms = NumberSeq (summary->get_total_seq(), | |
2546 4, other_parts); | |
2547 } else { | |
2548 // serial | |
2549 NumberSeq* other_parts[] = { | |
2550 body_summary->get_satb_drain_seq(), | |
2551 (preamble_summary == NULL) ? NULL : | |
2552 preamble_summary->get_pop_preamble_seq(), | |
2553 body_summary->get_update_rs_seq(), | |
2554 body_summary->get_ext_root_scan_seq(), | |
2555 body_summary->get_mark_stack_scan_seq(), | |
2556 body_summary->get_scan_only_seq(), | |
2557 body_summary->get_scan_rs_seq(), | |
2558 body_summary->get_obj_copy_seq() | |
2559 }; | |
2560 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
2561 8, other_parts); | |
2562 } | |
2563 } else { | |
2564 // abandoned | |
2565 NumberSeq* other_parts[] = { | |
2566 (preamble_summary == NULL) ? NULL : | |
2567 preamble_summary->get_pop_preamble_seq() | |
2568 }; | |
2569 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
2570 1, other_parts); | |
2571 } | |
2572 check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); | |
2573 } | |
2574 } else { | |
2575 print_indent(0); | |
2576 gclog_or_tty->print_cr("none"); | |
2577 } | |
2578 gclog_or_tty->print_cr(""); | |
2579 } | |
2580 | |
2581 void | |
2582 G1CollectorPolicy::print_abandoned_summary(PauseSummary* non_pop_summary, | |
2583 PauseSummary* pop_summary) const { | |
2584 bool printed = false; | |
2585 if (non_pop_summary->get_total_seq()->num() > 0) { | |
2586 printed = true; | |
2587 print_summary(non_pop_summary); | |
2588 } | |
2589 if (pop_summary->get_total_seq()->num() > 0) { | |
2590 printed = true; | |
2591 print_summary(pop_summary); | |
2592 } | |
2593 | |
2594 if (!printed) { | |
2595 print_indent(0); | |
2596 gclog_or_tty->print_cr("none"); | |
2597 gclog_or_tty->print_cr(""); | |
2598 } | |
2599 } | |
2600 | |
2601 void G1CollectorPolicy::print_tracing_info() const { | |
2602 if (TraceGen0Time) { | |
2603 gclog_or_tty->print_cr("ALL PAUSES"); | |
2604 print_summary_sd(0, "Total", _all_pause_times_ms); | |
2605 gclog_or_tty->print_cr(""); | |
2606 gclog_or_tty->print_cr(""); | |
2607 gclog_or_tty->print_cr(" Full Young GC Pauses: %8d", _full_young_pause_num); | |
2608 gclog_or_tty->print_cr(" Partial Young GC Pauses: %8d", _partial_young_pause_num); | |
2609 gclog_or_tty->print_cr(""); | |
2610 | |
2611 gclog_or_tty->print_cr("NON-POPULAR PAUSES"); | |
2612 print_summary(_non_pop_summary); | |
2613 | |
2614 gclog_or_tty->print_cr("POPULAR PAUSES"); | |
2615 print_summary(_pop_summary); | |
2616 | |
2617 gclog_or_tty->print_cr("ABANDONED PAUSES"); | |
2618 print_abandoned_summary(_non_pop_abandoned_summary, | |
2619 _pop_abandoned_summary); | |
2620 | |
2621 gclog_or_tty->print_cr("MISC"); | |
2622 print_summary_sd(0, "Stop World", _all_stop_world_times_ms); | |
2623 print_summary_sd(0, "Yields", _all_yield_times_ms); | |
2624 for (int i = 0; i < _aux_num; ++i) { | |
2625 if (_all_aux_times_ms[i].num() > 0) { | |
2626 char buffer[96]; | |
2627 sprintf(buffer, "Aux%d", i); | |
2628 print_summary_sd(0, buffer, &_all_aux_times_ms[i]); | |
2629 } | |
2630 } | |
2631 | |
2632 size_t all_region_num = _region_num_young + _region_num_tenured; | |
2633 gclog_or_tty->print_cr(" New Regions %8d, Young %8d (%6.2lf%%), " | |
2634 "Tenured %8d (%6.2lf%%)", | |
2635 all_region_num, | |
2636 _region_num_young, | |
2637 (double) _region_num_young / (double) all_region_num * 100.0, | |
2638 _region_num_tenured, | |
2639 (double) _region_num_tenured / (double) all_region_num * 100.0); | |
2640 | |
2641 if (!G1RSBarrierUseQueue) { | |
2642 gclog_or_tty->print_cr("Of %d times conc refinement was enabled, %d (%7.2f%%) " | |
2643 "did zero traversals.", | |
2644 _conc_refine_enabled, _conc_refine_zero_traversals, | |
2645 _conc_refine_enabled > 0 ? | |
2646 100.0 * (float)_conc_refine_zero_traversals/ | |
2647 (float)_conc_refine_enabled : 0.0); | |
2648 gclog_or_tty->print_cr(" Max # of traversals = %d.", | |
2649 _conc_refine_max_traversals); | |
2650 gclog_or_tty->print_cr(""); | |
2651 } | |
2652 } | |
2653 if (TraceGen1Time) { | |
2654 if (_all_full_gc_times_ms->num() > 0) { | |
2655 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", | |
2656 _all_full_gc_times_ms->num(), | |
2657 _all_full_gc_times_ms->sum() / 1000.0); | |
2658 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); | |
2659 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", | |
2660 _all_full_gc_times_ms->sd(), | |
2661 _all_full_gc_times_ms->maximum()); | |
2662 } | |
2663 } | |
2664 } | |
2665 | |
2666 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
2667 #ifndef PRODUCT | |
2668 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
2669 // add this call for any other surv rate groups | |
2670 #endif // PRODUCT | |
2671 } | |
2672 | |
2673 void G1CollectorPolicy::update_conc_refine_data() { | |
2674 unsigned traversals = _g1->concurrent_g1_refine()->disable(); | |
2675 if (traversals == 0) _conc_refine_zero_traversals++; | |
2676 _conc_refine_max_traversals = MAX2(_conc_refine_max_traversals, | |
2677 (size_t)traversals); | |
2678 | |
2679 if (G1PolicyVerbose > 1) | |
2680 gclog_or_tty->print_cr("Did a CR traversal series: %d traversals.", traversals); | |
2681 double multiplier = 1.0; | |
2682 if (traversals == 0) { | |
2683 multiplier = 4.0; | |
2684 } else if (traversals > (size_t)G1ConcRefineTargTraversals) { | |
2685 multiplier = 1.0/1.5; | |
2686 } else if (traversals < (size_t)G1ConcRefineTargTraversals) { | |
2687 multiplier = 1.5; | |
2688 } | |
2689 if (G1PolicyVerbose > 1) { | |
2690 gclog_or_tty->print_cr(" Multiplier = %7.2f.", multiplier); | |
2691 gclog_or_tty->print(" Delta went from %d regions to ", | |
2692 _conc_refine_current_delta); | |
2693 } | |
2694 _conc_refine_current_delta = | |
2695 MIN2(_g1->n_regions(), | |
2696 (size_t)(_conc_refine_current_delta * multiplier)); | |
2697 _conc_refine_current_delta = | |
2698 MAX2(_conc_refine_current_delta, (size_t)1); | |
2699 if (G1PolicyVerbose > 1) { | |
2700 gclog_or_tty->print_cr("%d regions.", _conc_refine_current_delta); | |
2701 } | |
2702 _conc_refine_enabled++; | |
2703 } | |
2704 | |
2705 void G1CollectorPolicy::set_single_region_collection_set(HeapRegion* hr) { | |
2706 assert(collection_set() == NULL, "Must be no current CS."); | |
2707 _collection_set_size = 0; | |
2708 _collection_set_bytes_used_before = 0; | |
2709 add_to_collection_set(hr); | |
2710 count_CS_bytes_used(); | |
2711 } | |
2712 | |
2713 bool | |
2714 G1CollectorPolicy::should_add_next_region_to_young_list() { | |
2715 assert(in_young_gc_mode(), "should be in young GC mode"); | |
2716 bool ret; | |
2717 size_t young_list_length = _g1->young_list_length(); | |
545 | 2718 size_t young_list_max_length = _young_list_target_length; |
2719 if (G1FixedEdenSize) { | |
2720 young_list_max_length -= _max_survivor_regions; | |
2721 } | |
2722 if (young_list_length < young_list_max_length) { | |
342 | 2723 ret = true; |
2724 ++_region_num_young; | |
2725 } else { | |
2726 ret = false; | |
2727 ++_region_num_tenured; | |
2728 } | |
2729 | |
2730 return ret; | |
2731 } | |
2732 | |
2733 #ifndef PRODUCT | |
2734 // for debugging, bit of a hack... | |
2735 static char* | |
2736 region_num_to_mbs(int length) { | |
2737 static char buffer[64]; | |
2738 double bytes = (double) (length * HeapRegion::GrainBytes); | |
2739 double mbs = bytes / (double) (1024 * 1024); | |
2740 sprintf(buffer, "%7.2lfMB", mbs); | |
2741 return buffer; | |
2742 } | |
2743 #endif // PRODUCT | |
2744 | |
2745 void | |
2746 G1CollectorPolicy::checkpoint_conc_overhead() { | |
2747 double conc_overhead = 0.0; | |
2748 if (G1AccountConcurrentOverhead) | |
2749 conc_overhead = COTracker::totalPredConcOverhead(); | |
2750 _mmu_tracker->update_conc_overhead(conc_overhead); | |
2751 #if 0 | |
2752 gclog_or_tty->print(" CO %1.4lf TARGET %1.4lf", | |
2753 conc_overhead, _mmu_tracker->max_gc_time()); | |
2754 #endif | |
2755 } | |
2756 | |
2757 | |
545 | 2758 size_t G1CollectorPolicy::max_regions(int purpose) { |
342 | 2759 switch (purpose) { |
2760 case GCAllocForSurvived: | |
545 | 2761 return _max_survivor_regions; |
342 | 2762 case GCAllocForTenured: |
545 | 2763 return REGIONS_UNLIMITED; |
342 | 2764 default: |
545 | 2765 ShouldNotReachHere(); |
2766 return REGIONS_UNLIMITED; | |
342 | 2767 }; |
2768 } | |
2769 | |
545 | 2770 // Calculates survivor space parameters. |
2771 void G1CollectorPolicy::calculate_survivors_policy() | |
2772 { | |
2773 if (!G1UseSurvivorSpace) { | |
2774 return; | |
2775 } | |
2776 if (G1FixedSurvivorSpaceSize == 0) { | |
2777 _max_survivor_regions = _young_list_target_length / SurvivorRatio; | |
2778 } else { | |
547
1e458753107d
6802413: G1: G1FixedSurvivorSpaceSize should be converted into regions in calculate_survivors_policy()
apetrusenko
parents:
545
diff
changeset
|
2779 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
545 | 2780 } |
2781 | |
2782 if (G1FixedTenuringThreshold) { | |
2783 _tenuring_threshold = MaxTenuringThreshold; | |
2784 } else { | |
2785 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( | |
2786 HeapRegion::GrainWords * _max_survivor_regions); | |
2787 } | |
2788 } | |
2789 | |
2790 | |
342 | 2791 void |
2792 G1CollectorPolicy_BestRegionsFirst:: | |
2793 set_single_region_collection_set(HeapRegion* hr) { | |
2794 G1CollectorPolicy::set_single_region_collection_set(hr); | |
2795 _collectionSetChooser->removeRegion(hr); | |
2796 } | |
2797 | |
2798 | |
2799 bool | |
2800 G1CollectorPolicy_BestRegionsFirst::should_do_collection_pause(size_t | |
2801 word_size) { | |
2802 assert(_g1->regions_accounted_for(), "Region leakage!"); | |
2803 // Initiate a pause when we reach the steady-state "used" target. | |
2804 size_t used_hard = (_g1->capacity() / 100) * G1SteadyStateUsed; | |
2805 size_t used_soft = | |
2806 MAX2((_g1->capacity() / 100) * (G1SteadyStateUsed - G1SteadyStateUsedDelta), | |
2807 used_hard/2); | |
2808 size_t used = _g1->used(); | |
2809 | |
2810 double max_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; | |
2811 | |
2812 size_t young_list_length = _g1->young_list_length(); | |
545 | 2813 size_t young_list_max_length = _young_list_target_length; |
2814 if (G1FixedEdenSize) { | |
2815 young_list_max_length -= _max_survivor_regions; | |
2816 } | |
2817 bool reached_target_length = young_list_length >= young_list_max_length; | |
342 | 2818 |
2819 if (in_young_gc_mode()) { | |
2820 if (reached_target_length) { | |
2821 assert( young_list_length > 0 && _g1->young_list_length() > 0, | |
2822 "invariant" ); | |
2823 _target_pause_time_ms = max_pause_time_ms; | |
2824 return true; | |
2825 } | |
2826 } else { | |
2827 guarantee( false, "should not reach here" ); | |
2828 } | |
2829 | |
2830 return false; | |
2831 } | |
2832 | |
2833 #ifndef PRODUCT | |
2834 class HRSortIndexIsOKClosure: public HeapRegionClosure { | |
2835 CollectionSetChooser* _chooser; | |
2836 public: | |
2837 HRSortIndexIsOKClosure(CollectionSetChooser* chooser) : | |
2838 _chooser(chooser) {} | |
2839 | |
2840 bool doHeapRegion(HeapRegion* r) { | |
2841 if (!r->continuesHumongous()) { | |
2842 assert(_chooser->regionProperlyOrdered(r), "Ought to be."); | |
2843 } | |
2844 return false; | |
2845 } | |
2846 }; | |
2847 | |
2848 bool G1CollectorPolicy_BestRegionsFirst::assertMarkedBytesDataOK() { | |
2849 HRSortIndexIsOKClosure cl(_collectionSetChooser); | |
2850 _g1->heap_region_iterate(&cl); | |
2851 return true; | |
2852 } | |
2853 #endif | |
2854 | |
2855 void | |
2856 G1CollectorPolicy_BestRegionsFirst:: | |
2857 record_collection_pause_start(double start_time_sec, size_t start_used) { | |
2858 G1CollectorPolicy::record_collection_pause_start(start_time_sec, start_used); | |
2859 } | |
2860 | |
2861 class NextNonCSElemFinder: public HeapRegionClosure { | |
2862 HeapRegion* _res; | |
2863 public: | |
2864 NextNonCSElemFinder(): _res(NULL) {} | |
2865 bool doHeapRegion(HeapRegion* r) { | |
2866 if (!r->in_collection_set()) { | |
2867 _res = r; | |
2868 return true; | |
2869 } else { | |
2870 return false; | |
2871 } | |
2872 } | |
2873 HeapRegion* res() { return _res; } | |
2874 }; | |
2875 | |
2876 class KnownGarbageClosure: public HeapRegionClosure { | |
2877 CollectionSetChooser* _hrSorted; | |
2878 | |
2879 public: | |
2880 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
2881 _hrSorted(hrSorted) | |
2882 {} | |
2883 | |
2884 bool doHeapRegion(HeapRegion* r) { | |
2885 // We only include humongous regions in collection | |
2886 // sets when concurrent mark shows that their contained object is | |
2887 // unreachable. | |
2888 | |
2889 // Do we have any marking information for this region? | |
2890 if (r->is_marked()) { | |
2891 // We don't include humongous regions in collection | |
2892 // sets because we collect them immediately at the end of a marking | |
2893 // cycle. We also don't include young regions because we *must* | |
2894 // include them in the next collection pause. | |
2895 if (!r->isHumongous() && !r->is_young()) { | |
2896 _hrSorted->addMarkedHeapRegion(r); | |
2897 } | |
2898 } | |
2899 return false; | |
2900 } | |
2901 }; | |
2902 | |
2903 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
2904 CollectionSetChooser* _hrSorted; | |
2905 jint _marked_regions_added; | |
2906 jint _chunk_size; | |
2907 jint _cur_chunk_idx; | |
2908 jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) | |
2909 int _worker; | |
2910 int _invokes; | |
2911 | |
2912 void get_new_chunk() { | |
2913 _cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size); | |
2914 _cur_chunk_end = _cur_chunk_idx + _chunk_size; | |
2915 } | |
2916 void add_region(HeapRegion* r) { | |
2917 if (_cur_chunk_idx == _cur_chunk_end) { | |
2918 get_new_chunk(); | |
2919 } | |
2920 assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); | |
2921 _hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r); | |
2922 _marked_regions_added++; | |
2923 _cur_chunk_idx++; | |
2924 } | |
2925 | |
2926 public: | |
2927 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
2928 jint chunk_size, | |
2929 int worker) : | |
2930 _hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker), | |
2931 _marked_regions_added(0), _cur_chunk_idx(0), _cur_chunk_end(0), | |
2932 _invokes(0) | |
2933 {} | |
2934 | |
2935 bool doHeapRegion(HeapRegion* r) { | |
2936 // We only include humongous regions in collection | |
2937 // sets when concurrent mark shows that their contained object is | |
2938 // unreachable. | |
2939 _invokes++; | |
2940 | |
2941 // Do we have any marking information for this region? | |
2942 if (r->is_marked()) { | |
2943 // We don't include humongous regions in collection | |
2944 // sets because we collect them immediately at the end of a marking | |
2945 // cycle. | |
2946 // We also do not include young regions in collection sets | |
2947 if (!r->isHumongous() && !r->is_young()) { | |
2948 add_region(r); | |
2949 } | |
2950 } | |
2951 return false; | |
2952 } | |
2953 jint marked_regions_added() { return _marked_regions_added; } | |
2954 int invokes() { return _invokes; } | |
2955 }; | |
2956 | |
2957 class ParKnownGarbageTask: public AbstractGangTask { | |
2958 CollectionSetChooser* _hrSorted; | |
2959 jint _chunk_size; | |
2960 G1CollectedHeap* _g1; | |
2961 public: | |
2962 ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) : | |
2963 AbstractGangTask("ParKnownGarbageTask"), | |
2964 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
2965 _g1(G1CollectedHeap::heap()) | |
2966 {} | |
2967 | |
2968 void work(int i) { | |
2969 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size, i); | |
2970 // Back to zero for the claim value. | |
355 | 2971 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, i, |
2972 HeapRegion::InitialClaimValue); | |
342 | 2973 jint regions_added = parKnownGarbageCl.marked_regions_added(); |
2974 _hrSorted->incNumMarkedHeapRegions(regions_added); | |
2975 if (G1PrintParCleanupStats) { | |
2976 gclog_or_tty->print(" Thread %d called %d times, added %d regions to list.\n", | |
2977 i, parKnownGarbageCl.invokes(), regions_added); | |
2978 } | |
2979 } | |
2980 }; | |
2981 | |
2982 void | |
2983 G1CollectorPolicy_BestRegionsFirst:: | |
2984 record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
2985 size_t max_live_bytes) { | |
2986 double start; | |
2987 if (G1PrintParCleanupStats) start = os::elapsedTime(); | |
2988 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
2989 | |
2990 _collectionSetChooser->clearMarkedHeapRegions(); | |
2991 double clear_marked_end; | |
2992 if (G1PrintParCleanupStats) { | |
2993 clear_marked_end = os::elapsedTime(); | |
2994 gclog_or_tty->print_cr(" clear marked regions + work1: %8.3f ms.", | |
2995 (clear_marked_end - start)*1000.0); | |
2996 } | |
2997 if (ParallelGCThreads > 0) { | |
2998 const size_t OverpartitionFactor = 4; | |
2999 const size_t MinChunkSize = 8; | |
3000 const size_t ChunkSize = | |
3001 MAX2(_g1->n_regions() / (ParallelGCThreads * OverpartitionFactor), | |
3002 MinChunkSize); | |
3003 _collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(), | |
3004 ChunkSize); | |
3005 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, | |
3006 (int) ChunkSize); | |
3007 _g1->workers()->run_task(&parKnownGarbageTask); | |
355 | 3008 |
3009 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
3010 "sanity check"); | |
342 | 3011 } else { |
3012 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
3013 _g1->heap_region_iterate(&knownGarbagecl); | |
3014 } | |
3015 double known_garbage_end; | |
3016 if (G1PrintParCleanupStats) { | |
3017 known_garbage_end = os::elapsedTime(); | |
3018 gclog_or_tty->print_cr(" compute known garbage: %8.3f ms.", | |
3019 (known_garbage_end - clear_marked_end)*1000.0); | |
3020 } | |
3021 _collectionSetChooser->sortMarkedHeapRegions(); | |
3022 double sort_end; | |
3023 if (G1PrintParCleanupStats) { | |
3024 sort_end = os::elapsedTime(); | |
3025 gclog_or_tty->print_cr(" sorting: %8.3f ms.", | |
3026 (sort_end - known_garbage_end)*1000.0); | |
3027 } | |
3028 | |
3029 record_concurrent_mark_cleanup_end_work2(); | |
3030 double work2_end; | |
3031 if (G1PrintParCleanupStats) { | |
3032 work2_end = os::elapsedTime(); | |
3033 gclog_or_tty->print_cr(" work2: %8.3f ms.", | |
3034 (work2_end - sort_end)*1000.0); | |
3035 } | |
3036 } | |
3037 | |
3038 // Add the heap region to the collection set and return the conservative | |
3039 // estimate of the number of live bytes. | |
3040 void G1CollectorPolicy:: | |
3041 add_to_collection_set(HeapRegion* hr) { | |
3042 if (G1TraceRegions) { | |
3043 gclog_or_tty->print_cr("added region to cset %d:["PTR_FORMAT", "PTR_FORMAT"], " | |
3044 "top "PTR_FORMAT", young %s", | |
3045 hr->hrs_index(), hr->bottom(), hr->end(), | |
3046 hr->top(), (hr->is_young()) ? "YES" : "NO"); | |
3047 } | |
3048 | |
3049 if (_g1->mark_in_progress()) | |
3050 _g1->concurrent_mark()->registerCSetRegion(hr); | |
3051 | |
3052 assert(!hr->in_collection_set(), | |
3053 "should not already be in the CSet"); | |
3054 hr->set_in_collection_set(true); | |
3055 hr->set_next_in_collection_set(_collection_set); | |
3056 _collection_set = hr; | |
3057 _collection_set_size++; | |
3058 _collection_set_bytes_used_before += hr->used(); | |
526 | 3059 _g1->register_region_with_in_cset_fast_test(hr); |
342 | 3060 } |
3061 | |
3062 void | |
3063 G1CollectorPolicy_BestRegionsFirst:: | |
3064 choose_collection_set(HeapRegion* pop_region) { | |
3065 double non_young_start_time_sec; | |
3066 start_recording_regions(); | |
3067 | |
3068 if (pop_region != NULL) { | |
3069 _target_pause_time_ms = (double) G1MaxPauseTimeMS; | |
3070 } else { | |
3071 guarantee(_target_pause_time_ms > -1.0, | |
3072 "_target_pause_time_ms should have been set!"); | |
3073 } | |
3074 | |
3075 // pop region is either null (and so is CS), or else it *is* the CS. | |
3076 assert(_collection_set == pop_region, "Precondition"); | |
3077 | |
3078 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
3079 double predicted_pause_time_ms = base_time_ms; | |
3080 | |
3081 double target_time_ms = _target_pause_time_ms; | |
3082 double time_remaining_ms = target_time_ms - base_time_ms; | |
3083 | |
3084 // the 10% and 50% values are arbitrary... | |
3085 if (time_remaining_ms < 0.10*target_time_ms) { | |
3086 time_remaining_ms = 0.50 * target_time_ms; | |
3087 _within_target = false; | |
3088 } else { | |
3089 _within_target = true; | |
3090 } | |
3091 | |
3092 // We figure out the number of bytes available for future to-space. | |
3093 // For new regions without marking information, we must assume the | |
3094 // worst-case of complete survival. If we have marking information for a | |
3095 // region, we can bound the amount of live data. We can add a number of | |
3096 // such regions, as long as the sum of the live data bounds does not | |
3097 // exceed the available evacuation space. | |
3098 size_t max_live_bytes = _g1->free_regions() * HeapRegion::GrainBytes; | |
3099 | |
3100 size_t expansion_bytes = | |
3101 _g1->expansion_regions() * HeapRegion::GrainBytes; | |
3102 | |
3103 if (pop_region == NULL) { | |
3104 _collection_set_bytes_used_before = 0; | |
3105 _collection_set_size = 0; | |
3106 } | |
3107 | |
3108 // Adjust for expansion and slop. | |
3109 max_live_bytes = max_live_bytes + expansion_bytes; | |
3110 | |
3111 assert(pop_region != NULL || _g1->regions_accounted_for(), "Region leakage!"); | |
3112 | |
3113 HeapRegion* hr; | |
3114 if (in_young_gc_mode()) { | |
3115 double young_start_time_sec = os::elapsedTime(); | |
3116 | |
3117 if (G1PolicyVerbose > 0) { | |
3118 gclog_or_tty->print_cr("Adding %d young regions to the CSet", | |
3119 _g1->young_list_length()); | |
3120 } | |
3121 _young_cset_length = 0; | |
3122 _last_young_gc_full = full_young_gcs() ? true : false; | |
3123 if (_last_young_gc_full) | |
3124 ++_full_young_pause_num; | |
3125 else | |
3126 ++_partial_young_pause_num; | |
3127 hr = _g1->pop_region_from_young_list(); | |
3128 while (hr != NULL) { | |
3129 | |
3130 assert( hr->young_index_in_cset() == -1, "invariant" ); | |
3131 assert( hr->age_in_surv_rate_group() != -1, "invariant" ); | |
3132 hr->set_young_index_in_cset((int) _young_cset_length); | |
3133 | |
3134 ++_young_cset_length; | |
3135 double predicted_time_ms = predict_region_elapsed_time_ms(hr, true); | |
3136 time_remaining_ms -= predicted_time_ms; | |
3137 predicted_pause_time_ms += predicted_time_ms; | |
3138 if (hr == pop_region) { | |
3139 // The popular region was young. Skip over it. | |
3140 assert(hr->in_collection_set(), "It's the pop region."); | |
3141 } else { | |
3142 assert(!hr->in_collection_set(), "It's not the pop region."); | |
3143 add_to_collection_set(hr); | |
3144 record_cset_region(hr, true); | |
3145 } | |
3146 max_live_bytes -= MIN2(hr->max_live_bytes(), max_live_bytes); | |
3147 if (G1PolicyVerbose > 0) { | |
3148 gclog_or_tty->print_cr(" Added [" PTR_FORMAT ", " PTR_FORMAT") to CS.", | |
3149 hr->bottom(), hr->end()); | |
3150 gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", | |
3151 max_live_bytes/K); | |
3152 } | |
3153 hr = _g1->pop_region_from_young_list(); | |
3154 } | |
3155 | |
3156 record_scan_only_regions(_g1->young_list_scan_only_length()); | |
3157 | |
3158 double young_end_time_sec = os::elapsedTime(); | |
3159 _recorded_young_cset_choice_time_ms = | |
3160 (young_end_time_sec - young_start_time_sec) * 1000.0; | |
3161 | |
3162 non_young_start_time_sec = os::elapsedTime(); | |
3163 | |
3164 if (_young_cset_length > 0 && _last_young_gc_full) { | |
3165 // don't bother adding more regions... | |
3166 goto choose_collection_set_end; | |
3167 } | |
3168 } else if (pop_region != NULL) { | |
3169 // We're not in young mode, and we chose a popular region; don't choose | |
3170 // any more. | |
3171 return; | |
3172 } | |
3173 | |
3174 if (!in_young_gc_mode() || !full_young_gcs()) { | |
3175 bool should_continue = true; | |
3176 NumberSeq seq; | |
3177 double avg_prediction = 100000000000000000.0; // something very large | |
3178 do { | |
3179 hr = _collectionSetChooser->getNextMarkedRegion(time_remaining_ms, | |
3180 avg_prediction); | |
3181 if (hr != NULL && !hr->popular()) { | |
3182 double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); | |
3183 time_remaining_ms -= predicted_time_ms; | |
3184 predicted_pause_time_ms += predicted_time_ms; | |
3185 add_to_collection_set(hr); | |
3186 record_cset_region(hr, false); | |
3187 max_live_bytes -= MIN2(hr->max_live_bytes(), max_live_bytes); | |
3188 if (G1PolicyVerbose > 0) { | |
3189 gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", | |
3190 max_live_bytes/K); | |
3191 } | |
3192 seq.add(predicted_time_ms); | |
3193 avg_prediction = seq.avg() + seq.sd(); | |
3194 } | |
3195 should_continue = | |
3196 ( hr != NULL) && | |
3197 ( (adaptive_young_list_length()) ? time_remaining_ms > 0.0 | |
3198 : _collection_set_size < _young_list_fixed_length ); | |
3199 } while (should_continue); | |
3200 | |
3201 if (!adaptive_young_list_length() && | |
3202 _collection_set_size < _young_list_fixed_length) | |
3203 _should_revert_to_full_young_gcs = true; | |
3204 } | |
3205 | |
3206 choose_collection_set_end: | |
3207 count_CS_bytes_used(); | |
3208 | |
3209 end_recording_regions(); | |
3210 | |
3211 double non_young_end_time_sec = os::elapsedTime(); | |
3212 _recorded_non_young_cset_choice_time_ms = | |
3213 (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; | |
3214 } | |
3215 | |
3216 void G1CollectorPolicy_BestRegionsFirst::record_full_collection_end() { | |
3217 G1CollectorPolicy::record_full_collection_end(); | |
3218 _collectionSetChooser->updateAfterFullCollection(); | |
3219 } | |
3220 | |
3221 void G1CollectorPolicy_BestRegionsFirst:: | |
3222 expand_if_possible(size_t numRegions) { | |
3223 size_t expansion_bytes = numRegions * HeapRegion::GrainBytes; | |
3224 _g1->expand(expansion_bytes); | |
3225 } | |
3226 | |
3227 void G1CollectorPolicy_BestRegionsFirst:: | |
3228 record_collection_pause_end(bool popular, bool abandoned) { | |
3229 G1CollectorPolicy::record_collection_pause_end(popular, abandoned); | |
3230 assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end."); | |
3231 } | |
3232 | |
3233 // Local Variables: *** | |
3234 // c-indentation-style: gnu *** | |
3235 // End: *** |