Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
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date | Thu, 27 May 2010 19:08:38 -0700 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
25 #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 // all the same | |
46 static double fully_young_cards_per_entry_ratio_defaults[] = { | |
47 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 | |
48 }; | |
49 | |
50 static double cost_per_entry_ms_defaults[] = { | |
51 0.015, 0.01, 0.01, 0.008, 0.008, 0.0055, 0.0055, 0.005 | |
52 }; | |
53 | |
54 static double cost_per_byte_ms_defaults[] = { | |
55 0.00006, 0.00003, 0.00003, 0.000015, 0.000015, 0.00001, 0.00001, 0.000009 | |
56 }; | |
57 | |
58 // these should be pretty consistent | |
59 static double constant_other_time_ms_defaults[] = { | |
60 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0 | |
61 }; | |
62 | |
63 | |
64 static double young_other_cost_per_region_ms_defaults[] = { | |
65 0.3, 0.2, 0.2, 0.15, 0.15, 0.12, 0.12, 0.1 | |
66 }; | |
67 | |
68 static double non_young_other_cost_per_region_ms_defaults[] = { | |
69 1.0, 0.7, 0.7, 0.5, 0.5, 0.42, 0.42, 0.30 | |
70 }; | |
71 | |
72 // </NEW PREDICTION> | |
73 | |
74 G1CollectorPolicy::G1CollectorPolicy() : | |
75 _parallel_gc_threads((ParallelGCThreads > 0) ? ParallelGCThreads : 1), | |
76 _n_pauses(0), | |
77 _recent_CH_strong_roots_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
78 _recent_G1_strong_roots_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
79 _recent_evac_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
80 _recent_pause_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
81 _recent_rs_sizes(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
82 _recent_gc_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
83 _all_pause_times_ms(new NumberSeq()), | |
84 _stop_world_start(0.0), | |
85 _all_stop_world_times_ms(new NumberSeq()), | |
86 _all_yield_times_ms(new NumberSeq()), | |
87 | |
88 _all_mod_union_times_ms(new NumberSeq()), | |
89 | |
677 | 90 _summary(new Summary()), |
91 _abandoned_summary(new AbandonedSummary()), | |
342 | 92 |
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93 #ifndef PRODUCT |
342 | 94 _cur_clear_ct_time_ms(0.0), |
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95 _min_clear_cc_time_ms(-1.0), |
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96 _max_clear_cc_time_ms(-1.0), |
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97 _cur_clear_cc_time_ms(0.0), |
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98 _cum_clear_cc_time_ms(0.0), |
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99 _num_cc_clears(0L), |
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100 #endif |
342 | 101 |
102 _region_num_young(0), | |
103 _region_num_tenured(0), | |
104 _prev_region_num_young(0), | |
105 _prev_region_num_tenured(0), | |
106 | |
107 _aux_num(10), | |
108 _all_aux_times_ms(new NumberSeq[_aux_num]), | |
109 _cur_aux_start_times_ms(new double[_aux_num]), | |
110 _cur_aux_times_ms(new double[_aux_num]), | |
111 _cur_aux_times_set(new bool[_aux_num]), | |
112 | |
113 _concurrent_mark_init_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
114 _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
115 _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
116 | |
117 // <NEW PREDICTION> | |
118 | |
119 _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
120 _prev_collection_pause_end_ms(0.0), | |
121 _pending_card_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
122 _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
123 _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
124 _fully_young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), | |
125 _partially_young_cards_per_entry_ratio_seq( | |
126 new TruncatedSeq(TruncatedSeqLength)), | |
127 _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
128 _partially_young_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
129 _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
130 _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
131 _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
132 _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
133 _non_young_other_cost_per_region_ms_seq( | |
134 new TruncatedSeq(TruncatedSeqLength)), | |
135 | |
136 _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
137 _scanned_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
138 _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), | |
139 | |
751 | 140 _pause_time_target_ms((double) MaxGCPauseMillis), |
342 | 141 |
142 // </NEW PREDICTION> | |
143 | |
144 _in_young_gc_mode(false), | |
145 _full_young_gcs(true), | |
146 _full_young_pause_num(0), | |
147 _partial_young_pause_num(0), | |
148 | |
149 _during_marking(false), | |
150 _in_marking_window(false), | |
151 _in_marking_window_im(false), | |
152 | |
153 _known_garbage_ratio(0.0), | |
154 _known_garbage_bytes(0), | |
155 | |
156 _young_gc_eff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
157 _target_pause_time_ms(-1.0), | |
158 | |
159 _recent_prev_end_times_for_all_gcs_sec(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
160 | |
161 _recent_CS_bytes_used_before(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
162 _recent_CS_bytes_surviving(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
163 | |
164 _recent_avg_pause_time_ratio(0.0), | |
165 _num_markings(0), | |
166 _n_marks(0), | |
167 _n_pauses_at_mark_end(0), | |
168 | |
169 _all_full_gc_times_ms(new NumberSeq()), | |
170 | |
171 // G1PausesBtwnConcMark defaults to -1 | |
172 // so the hack is to do the cast QQQ FIXME | |
173 _pauses_btwn_concurrent_mark((size_t)G1PausesBtwnConcMark), | |
174 _n_marks_since_last_pause(0), | |
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175 _initiate_conc_mark_if_possible(false), |
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176 _during_initial_mark_pause(false), |
342 | 177 _should_revert_to_full_young_gcs(false), |
178 _last_full_young_gc(false), | |
179 | |
180 _prev_collection_pause_used_at_end_bytes(0), | |
181 | |
182 _collection_set(NULL), | |
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183 _collection_set_size(0), |
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184 _collection_set_bytes_used_before(0), |
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185 |
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186 // Incremental CSet attributes |
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187 _inc_cset_build_state(Inactive), |
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188 _inc_cset_head(NULL), |
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189 _inc_cset_tail(NULL), |
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190 _inc_cset_size(0), |
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191 _inc_cset_young_index(0), |
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192 _inc_cset_bytes_used_before(0), |
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193 _inc_cset_max_finger(NULL), |
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194 _inc_cset_recorded_young_bytes(0), |
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195 _inc_cset_recorded_rs_lengths(0), |
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196 _inc_cset_predicted_elapsed_time_ms(0.0), |
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197 _inc_cset_predicted_bytes_to_copy(0), |
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198 |
342 | 199 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
200 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
201 #endif // _MSC_VER | |
202 | |
203 _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", | |
204 G1YoungSurvRateNumRegionsSummary)), | |
205 _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", | |
545 | 206 G1YoungSurvRateNumRegionsSummary)), |
342 | 207 // add here any more surv rate groups |
545 | 208 _recorded_survivor_regions(0), |
209 _recorded_survivor_head(NULL), | |
210 _recorded_survivor_tail(NULL), | |
1356 | 211 _survivors_age_table(true), |
212 | |
213 _gc_overhead_perc(0.0) | |
545 | 214 |
342 | 215 { |
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216 // Set up the region size and associated fields. Given that the |
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217 // policy is created before the heap, we have to set this up here, |
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218 // so it's done as soon as possible. |
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219 HeapRegion::setup_heap_region_size(Arguments::min_heap_size()); |
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220 HeapRegionRemSet::setup_remset_size(); |
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221 |
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222 // Verify PLAB sizes |
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223 const uint region_size = HeapRegion::GrainWords; |
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224 if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
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225 char buffer[128]; |
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226 jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most %u", |
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227 OldPLABSize > region_size ? "Old" : "Young", region_size); |
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228 vm_exit_during_initialization(buffer); |
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229 } |
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230 |
342 | 231 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
232 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
233 | |
234 _par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads]; | |
235 _par_last_mark_stack_scan_times_ms = new double[_parallel_gc_threads]; | |
236 | |
237 _par_last_update_rs_start_times_ms = new double[_parallel_gc_threads]; | |
238 _par_last_update_rs_times_ms = new double[_parallel_gc_threads]; | |
239 _par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; | |
240 | |
241 _par_last_scan_rs_start_times_ms = new double[_parallel_gc_threads]; | |
242 _par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; | |
243 _par_last_scan_new_refs_times_ms = new double[_parallel_gc_threads]; | |
244 | |
245 _par_last_obj_copy_times_ms = new double[_parallel_gc_threads]; | |
246 | |
247 _par_last_termination_times_ms = new double[_parallel_gc_threads]; | |
248 | |
249 // start conservatively | |
751 | 250 _expensive_region_limit_ms = 0.5 * (double) MaxGCPauseMillis; |
342 | 251 |
252 // <NEW PREDICTION> | |
253 | |
254 int index; | |
255 if (ParallelGCThreads == 0) | |
256 index = 0; | |
257 else if (ParallelGCThreads > 8) | |
258 index = 7; | |
259 else | |
260 index = ParallelGCThreads - 1; | |
261 | |
262 _pending_card_diff_seq->add(0.0); | |
263 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
264 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
265 _fully_young_cards_per_entry_ratio_seq->add( | |
266 fully_young_cards_per_entry_ratio_defaults[index]); | |
267 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); | |
268 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
269 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
270 _young_other_cost_per_region_ms_seq->add( | |
271 young_other_cost_per_region_ms_defaults[index]); | |
272 _non_young_other_cost_per_region_ms_seq->add( | |
273 non_young_other_cost_per_region_ms_defaults[index]); | |
274 | |
275 // </NEW PREDICTION> | |
276 | |
751 | 277 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
278 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; | |
342 | 279 guarantee(max_gc_time < time_slice, |
280 "Max GC time should not be greater than the time slice"); | |
281 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); | |
751 | 282 _sigma = (double) G1ConfidencePercent / 100.0; |
342 | 283 |
284 // start conservatively (around 50ms is about right) | |
285 _concurrent_mark_init_times_ms->add(0.05); | |
286 _concurrent_mark_remark_times_ms->add(0.05); | |
287 _concurrent_mark_cleanup_times_ms->add(0.20); | |
288 _tenuring_threshold = MaxTenuringThreshold; | |
289 | |
1282 | 290 // if G1FixedSurvivorSpaceSize is 0 which means the size is not |
291 // fixed, then _max_survivor_regions will be calculated at | |
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292 // calculate_young_list_target_length during initialization |
1282 | 293 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
545 | 294 |
1356 | 295 assert(GCTimeRatio > 0, |
296 "we should have set it to a default value set_g1_gc_flags() " | |
297 "if a user set it to 0"); | |
298 _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); | |
299 | |
342 | 300 initialize_all(); |
301 } | |
302 | |
303 // Increment "i", mod "len" | |
304 static void inc_mod(int& i, int len) { | |
305 i++; if (i == len) i = 0; | |
306 } | |
307 | |
308 void G1CollectorPolicy::initialize_flags() { | |
309 set_min_alignment(HeapRegion::GrainBytes); | |
310 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
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311 if (SurvivorRatio < 1) { |
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312 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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313 } |
342 | 314 CollectorPolicy::initialize_flags(); |
315 } | |
316 | |
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317 // The easiest way to deal with the parsing of the NewSize / |
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318 // MaxNewSize / etc. parameteres is to re-use the code in the |
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319 // TwoGenerationCollectorPolicy class. This is similar to what |
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320 // ParallelScavenge does with its GenerationSizer class (see |
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321 // ParallelScavengeHeap::initialize()). We might change this in the |
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322 // future, but it's a good start. |
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323 class G1YoungGenSizer : public TwoGenerationCollectorPolicy { |
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324 size_t size_to_region_num(size_t byte_size) { |
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325 return MAX2((size_t) 1, byte_size / HeapRegion::GrainBytes); |
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326 } |
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327 |
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328 public: |
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329 G1YoungGenSizer() { |
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330 initialize_flags(); |
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331 initialize_size_info(); |
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332 } |
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333 |
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334 size_t min_young_region_num() { |
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335 return size_to_region_num(_min_gen0_size); |
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336 } |
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337 size_t initial_young_region_num() { |
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338 return size_to_region_num(_initial_gen0_size); |
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339 } |
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340 size_t max_young_region_num() { |
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341 return size_to_region_num(_max_gen0_size); |
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342 } |
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343 }; |
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344 |
342 | 345 void G1CollectorPolicy::init() { |
346 // Set aside an initial future to_space. | |
347 _g1 = G1CollectedHeap::heap(); | |
348 | |
349 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
350 | |
545 | 351 initialize_gc_policy_counters(); |
352 | |
342 | 353 if (G1Gen) { |
354 _in_young_gc_mode = true; | |
355 | |
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356 G1YoungGenSizer sizer; |
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357 size_t initial_region_num = sizer.initial_young_region_num(); |
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358 |
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359 if (UseAdaptiveSizePolicy) { |
342 | 360 set_adaptive_young_list_length(true); |
361 _young_list_fixed_length = 0; | |
362 } else { | |
363 set_adaptive_young_list_length(false); | |
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364 _young_list_fixed_length = initial_region_num; |
342 | 365 } |
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366 _free_regions_at_end_of_collection = _g1->free_regions(); |
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367 calculate_young_list_min_length(); |
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368 guarantee( _young_list_min_length == 0, "invariant, not enough info" ); |
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369 calculate_young_list_target_length(); |
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370 } else { |
342 | 371 _young_list_fixed_length = 0; |
372 _in_young_gc_mode = false; | |
373 } | |
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374 |
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375 // We may immediately start allocating regions and placing them on the |
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376 // collection set list. Initialize the per-collection set info |
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377 start_incremental_cset_building(); |
342 | 378 } |
379 | |
545 | 380 // Create the jstat counters for the policy. |
381 void G1CollectorPolicy::initialize_gc_policy_counters() | |
382 { | |
383 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 2 + G1Gen); | |
384 } | |
385 | |
342 | 386 void G1CollectorPolicy::calculate_young_list_min_length() { |
387 _young_list_min_length = 0; | |
388 | |
389 if (!adaptive_young_list_length()) | |
390 return; | |
391 | |
392 if (_alloc_rate_ms_seq->num() > 3) { | |
393 double now_sec = os::elapsedTime(); | |
394 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; | |
395 double alloc_rate_ms = predict_alloc_rate_ms(); | |
396 int min_regions = (int) ceil(alloc_rate_ms * when_ms); | |
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397 int current_region_num = (int) _g1->young_list()->length(); |
342 | 398 _young_list_min_length = min_regions + current_region_num; |
399 } | |
400 } | |
401 | |
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402 void G1CollectorPolicy::calculate_young_list_target_length() { |
342 | 403 if (adaptive_young_list_length()) { |
404 size_t rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); | |
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405 calculate_young_list_target_length(rs_lengths); |
342 | 406 } else { |
407 if (full_young_gcs()) | |
408 _young_list_target_length = _young_list_fixed_length; | |
409 else | |
410 _young_list_target_length = _young_list_fixed_length / 2; | |
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411 |
342 | 412 _young_list_target_length = MAX2(_young_list_target_length, (size_t)1); |
413 } | |
545 | 414 calculate_survivors_policy(); |
342 | 415 } |
416 | |
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417 void G1CollectorPolicy::calculate_young_list_target_length(size_t rs_lengths) { |
342 | 418 guarantee( adaptive_young_list_length(), "pre-condition" ); |
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419 guarantee( !_in_marking_window || !_last_full_young_gc, "invariant" ); |
342 | 420 |
421 double start_time_sec = os::elapsedTime(); | |
1282 | 422 size_t min_reserve_perc = MAX2((size_t)2, (size_t)G1ReservePercent); |
342 | 423 min_reserve_perc = MIN2((size_t) 50, min_reserve_perc); |
424 size_t reserve_regions = | |
425 (size_t) ((double) min_reserve_perc * (double) _g1->n_regions() / 100.0); | |
426 | |
427 if (full_young_gcs() && _free_regions_at_end_of_collection > 0) { | |
428 // we are in fully-young mode and there are free regions in the heap | |
429 | |
545 | 430 double survivor_regions_evac_time = |
431 predict_survivor_regions_evac_time(); | |
432 | |
342 | 433 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
434 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); | |
435 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); | |
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436 size_t scanned_cards = predict_young_card_num(adj_rs_lengths); |
545 | 437 double base_time_ms = predict_base_elapsed_time_ms(pending_cards, scanned_cards) |
438 + survivor_regions_evac_time; | |
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439 |
342 | 440 // the result |
441 size_t final_young_length = 0; | |
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442 |
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443 size_t init_free_regions = |
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444 MAX2((size_t)0, _free_regions_at_end_of_collection - reserve_regions); |
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445 |
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446 // if we're still under the pause target... |
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447 if (base_time_ms <= target_pause_time_ms) { |
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448 // We make sure that the shortest young length that makes sense |
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449 // fits within the target pause time. |
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450 size_t min_young_length = 1; |
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451 |
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452 if (predict_will_fit(min_young_length, base_time_ms, |
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453 init_free_regions, target_pause_time_ms)) { |
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454 // The shortest young length will fit within the target pause time; |
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455 // we'll now check whether the absolute maximum number of young |
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456 // regions will fit in the target pause time. If not, we'll do |
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457 // a binary search between min_young_length and max_young_length |
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458 size_t abs_max_young_length = _free_regions_at_end_of_collection - 1; |
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459 size_t max_young_length = abs_max_young_length; |
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460 |
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461 if (max_young_length > min_young_length) { |
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462 // Let's check if the initial max young length will fit within the |
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463 // target pause. If so then there is no need to search for a maximal |
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464 // young length - we'll return the initial maximum |
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465 |
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466 if (predict_will_fit(max_young_length, base_time_ms, |
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467 init_free_regions, target_pause_time_ms)) { |
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468 // The maximum young length will satisfy the target pause time. |
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469 // We are done so set min young length to this maximum length. |
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470 // The code after the loop will then set final_young_length using |
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471 // the value cached in the minimum length. |
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472 min_young_length = max_young_length; |
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473 } else { |
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474 // The maximum possible number of young regions will not fit within |
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475 // the target pause time so let's search.... |
342 | 476 |
477 size_t diff = (max_young_length - min_young_length) / 2; | |
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478 max_young_length = min_young_length + diff; |
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479 |
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480 while (max_young_length > min_young_length) { |
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481 if (predict_will_fit(max_young_length, base_time_ms, |
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482 init_free_regions, target_pause_time_ms)) { |
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483 |
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484 // The current max young length will fit within the target |
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485 // pause time. Note we do not exit the loop here. By setting |
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486 // min = max, and then increasing the max below means that |
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487 // we will continue searching for an upper bound in the |
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488 // range [max..max+diff] |
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489 min_young_length = max_young_length; |
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490 } |
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491 diff = (max_young_length - min_young_length) / 2; |
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492 max_young_length = min_young_length + diff; |
342 | 493 } |
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494 // the above loop found a maximal young length that will fit |
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495 // within the target pause time. |
342 | 496 } |
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497 assert(min_young_length <= abs_max_young_length, "just checking"); |
342 | 498 } |
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499 final_young_length = min_young_length; |
342 | 500 } |
501 } | |
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502 // and we're done! |
342 | 503 |
504 // we should have at least one region in the target young length | |
545 | 505 _young_list_target_length = |
506 MAX2((size_t) 1, final_young_length + _recorded_survivor_regions); | |
342 | 507 |
508 // let's keep an eye of how long we spend on this calculation | |
509 // right now, I assume that we'll print it when we need it; we | |
510 // should really adde it to the breakdown of a pause | |
511 double end_time_sec = os::elapsedTime(); | |
512 double elapsed_time_ms = (end_time_sec - start_time_sec) * 1000.0; | |
513 | |
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514 #ifdef TRACE_CALC_YOUNG_LENGTH |
342 | 515 // leave this in for debugging, just in case |
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516 gclog_or_tty->print_cr("target = %1.1lf ms, young = " SIZE_FORMAT ", " |
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517 "elapsed %1.2lf ms, (%s%s) " SIZE_FORMAT SIZE_FORMAT, |
342 | 518 target_pause_time_ms, |
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519 _young_list_target_length |
342 | 520 elapsed_time_ms, |
521 full_young_gcs() ? "full" : "partial", | |
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522 during_initial_mark_pause() ? " i-m" : "", |
545 | 523 _in_marking_window, |
524 _in_marking_window_im); | |
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525 #endif // TRACE_CALC_YOUNG_LENGTH |
342 | 526 |
527 if (_young_list_target_length < _young_list_min_length) { | |
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528 // bummer; this means that, if we do a pause when the maximal |
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529 // length dictates, we'll violate the pause spacing target (the |
342 | 530 // min length was calculate based on the application's current |
531 // alloc rate); | |
532 | |
533 // so, we have to bite the bullet, and allocate the minimum | |
534 // number. We'll violate our target, but we just can't meet it. | |
535 | |
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536 #ifdef TRACE_CALC_YOUNG_LENGTH |
342 | 537 // leave this in for debugging, just in case |
538 gclog_or_tty->print_cr("adjusted target length from " | |
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539 SIZE_FORMAT " to " SIZE_FORMAT, |
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540 _young_list_target_length, _young_list_min_length); |
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541 #endif // TRACE_CALC_YOUNG_LENGTH |
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542 |
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543 _young_list_target_length = _young_list_min_length; |
342 | 544 } |
545 } else { | |
546 // we are in a partially-young mode or we've run out of regions (due | |
547 // to evacuation failure) | |
548 | |
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549 #ifdef TRACE_CALC_YOUNG_LENGTH |
342 | 550 // leave this in for debugging, just in case |
551 gclog_or_tty->print_cr("(partial) setting target to " SIZE_FORMAT | |
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552 _young_list_min_length); |
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553 #endif // TRACE_CALC_YOUNG_LENGTH |
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554 // we'll do the pause as soon as possible by choosing the minimum |
342 | 555 _young_list_target_length = |
556 MAX2(_young_list_min_length, (size_t) 1); | |
557 } | |
558 | |
559 _rs_lengths_prediction = rs_lengths; | |
560 } | |
561 | |
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562 // This is used by: calculate_young_list_target_length(rs_length). It |
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563 // returns true iff: |
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564 // the predicted pause time for the given young list will not overflow |
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565 // the target pause time |
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566 // and: |
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567 // the predicted amount of surviving data will not overflow the |
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568 // the amount of free space available for survivor regions. |
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569 // |
342 | 570 bool |
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571 G1CollectorPolicy::predict_will_fit(size_t young_length, |
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572 double base_time_ms, |
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573 size_t init_free_regions, |
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574 double target_pause_time_ms) { |
342 | 575 |
576 if (young_length >= init_free_regions) | |
577 // end condition 1: not enough space for the young regions | |
578 return false; | |
579 | |
580 double accum_surv_rate_adj = 0.0; | |
581 double accum_surv_rate = | |
582 accum_yg_surv_rate_pred((int)(young_length - 1)) - accum_surv_rate_adj; | |
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583 |
342 | 584 size_t bytes_to_copy = |
585 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); | |
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586 |
342 | 587 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
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588 |
342 | 589 double young_other_time_ms = |
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590 predict_young_other_time_ms(young_length); |
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591 |
342 | 592 double pause_time_ms = |
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593 base_time_ms + copy_time_ms + young_other_time_ms; |
342 | 594 |
595 if (pause_time_ms > target_pause_time_ms) | |
596 // end condition 2: over the target pause time | |
597 return false; | |
598 | |
599 size_t free_bytes = | |
600 (init_free_regions - young_length) * HeapRegion::GrainBytes; | |
601 | |
602 if ((2.0 + sigma()) * (double) bytes_to_copy > (double) free_bytes) | |
603 // end condition 3: out of to-space (conservatively) | |
604 return false; | |
605 | |
606 // success! | |
607 return true; | |
608 } | |
609 | |
545 | 610 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
611 double survivor_regions_evac_time = 0.0; | |
612 for (HeapRegion * r = _recorded_survivor_head; | |
613 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
614 r = r->get_next_young_region()) { | |
615 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); | |
616 } | |
617 return survivor_regions_evac_time; | |
618 } | |
619 | |
342 | 620 void G1CollectorPolicy::check_prediction_validity() { |
621 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); | |
622 | |
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623 size_t rs_lengths = _g1->young_list()->sampled_rs_lengths(); |
342 | 624 if (rs_lengths > _rs_lengths_prediction) { |
625 // add 10% to avoid having to recalculate often | |
626 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
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627 calculate_young_list_target_length(rs_lengths_prediction); |
342 | 628 } |
629 } | |
630 | |
631 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, | |
632 bool is_tlab, | |
633 bool* gc_overhead_limit_was_exceeded) { | |
634 guarantee(false, "Not using this policy feature yet."); | |
635 return NULL; | |
636 } | |
637 | |
638 // This method controls how a collector handles one or more | |
639 // of its generations being fully allocated. | |
640 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
641 bool is_tlab) { | |
642 guarantee(false, "Not using this policy feature yet."); | |
643 return NULL; | |
644 } | |
645 | |
646 | |
647 #ifndef PRODUCT | |
648 bool G1CollectorPolicy::verify_young_ages() { | |
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649 HeapRegion* head = _g1->young_list()->first_region(); |
342 | 650 return |
651 verify_young_ages(head, _short_lived_surv_rate_group); | |
652 // also call verify_young_ages on any additional surv rate groups | |
653 } | |
654 | |
655 bool | |
656 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
657 SurvRateGroup *surv_rate_group) { | |
658 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
659 | |
660 const char* name = surv_rate_group->name(); | |
661 bool ret = true; | |
662 int prev_age = -1; | |
663 | |
664 for (HeapRegion* curr = head; | |
665 curr != NULL; | |
666 curr = curr->get_next_young_region()) { | |
667 SurvRateGroup* group = curr->surv_rate_group(); | |
668 if (group == NULL && !curr->is_survivor()) { | |
669 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
670 ret = false; | |
671 } | |
672 | |
673 if (surv_rate_group == group) { | |
674 int age = curr->age_in_surv_rate_group(); | |
675 | |
676 if (age < 0) { | |
677 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
678 ret = false; | |
679 } | |
680 | |
681 if (age <= prev_age) { | |
682 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
683 "(%d, %d)", name, age, prev_age); | |
684 ret = false; | |
685 } | |
686 prev_age = age; | |
687 } | |
688 } | |
689 | |
690 return ret; | |
691 } | |
692 #endif // PRODUCT | |
693 | |
694 void G1CollectorPolicy::record_full_collection_start() { | |
695 _cur_collection_start_sec = os::elapsedTime(); | |
696 // Release the future to-space so that it is available for compaction into. | |
697 _g1->set_full_collection(); | |
698 } | |
699 | |
700 void G1CollectorPolicy::record_full_collection_end() { | |
701 // Consider this like a collection pause for the purposes of allocation | |
702 // since last pause. | |
703 double end_sec = os::elapsedTime(); | |
704 double full_gc_time_sec = end_sec - _cur_collection_start_sec; | |
705 double full_gc_time_ms = full_gc_time_sec * 1000.0; | |
706 | |
707 _all_full_gc_times_ms->add(full_gc_time_ms); | |
708 | |
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709 update_recent_gc_times(end_sec, full_gc_time_ms); |
342 | 710 |
711 _g1->clear_full_collection(); | |
712 | |
713 // "Nuke" the heuristics that control the fully/partially young GC | |
714 // transitions and make sure we start with fully young GCs after the | |
715 // Full GC. | |
716 set_full_young_gcs(true); | |
717 _last_full_young_gc = false; | |
718 _should_revert_to_full_young_gcs = false; | |
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719 clear_initiate_conc_mark_if_possible(); |
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720 clear_during_initial_mark_pause(); |
342 | 721 _known_garbage_bytes = 0; |
722 _known_garbage_ratio = 0.0; | |
723 _in_marking_window = false; | |
724 _in_marking_window_im = false; | |
725 | |
726 _short_lived_surv_rate_group->start_adding_regions(); | |
727 // also call this on any additional surv rate groups | |
728 | |
545 | 729 record_survivor_regions(0, NULL, NULL); |
730 | |
342 | 731 _prev_region_num_young = _region_num_young; |
732 _prev_region_num_tenured = _region_num_tenured; | |
733 | |
734 _free_regions_at_end_of_collection = _g1->free_regions(); | |
545 | 735 // Reset survivors SurvRateGroup. |
736 _survivor_surv_rate_group->reset(); | |
342 | 737 calculate_young_list_min_length(); |
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738 calculate_young_list_target_length(); |
342 | 739 } |
740 | |
741 void G1CollectorPolicy::record_before_bytes(size_t bytes) { | |
742 _bytes_in_to_space_before_gc += bytes; | |
743 } | |
744 | |
745 void G1CollectorPolicy::record_after_bytes(size_t bytes) { | |
746 _bytes_in_to_space_after_gc += bytes; | |
747 } | |
748 | |
749 void G1CollectorPolicy::record_stop_world_start() { | |
750 _stop_world_start = os::elapsedTime(); | |
751 } | |
752 | |
753 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, | |
754 size_t start_used) { | |
755 if (PrintGCDetails) { | |
756 gclog_or_tty->stamp(PrintGCTimeStamps); | |
757 gclog_or_tty->print("[GC pause"); | |
758 if (in_young_gc_mode()) | |
759 gclog_or_tty->print(" (%s)", full_young_gcs() ? "young" : "partial"); | |
760 } | |
761 | |
762 assert(_g1->used_regions() == _g1->recalculate_used_regions(), | |
763 "sanity"); | |
636 | 764 assert(_g1->used() == _g1->recalculate_used(), "sanity"); |
342 | 765 |
766 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
767 _all_stop_world_times_ms->add(s_w_t_ms); | |
768 _stop_world_start = 0.0; | |
769 | |
770 _cur_collection_start_sec = start_time_sec; | |
771 _cur_collection_pause_used_at_start_bytes = start_used; | |
772 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); | |
773 _pending_cards = _g1->pending_card_num(); | |
774 _max_pending_cards = _g1->max_pending_card_num(); | |
775 | |
776 _bytes_in_to_space_before_gc = 0; | |
777 _bytes_in_to_space_after_gc = 0; | |
778 _bytes_in_collection_set_before_gc = 0; | |
779 | |
780 #ifdef DEBUG | |
781 // initialise these to something well known so that we can spot | |
782 // if they are not set properly | |
783 | |
784 for (int i = 0; i < _parallel_gc_threads; ++i) { | |
785 _par_last_ext_root_scan_times_ms[i] = -666.0; | |
786 _par_last_mark_stack_scan_times_ms[i] = -666.0; | |
787 _par_last_update_rs_start_times_ms[i] = -666.0; | |
788 _par_last_update_rs_times_ms[i] = -666.0; | |
789 _par_last_update_rs_processed_buffers[i] = -666.0; | |
790 _par_last_scan_rs_start_times_ms[i] = -666.0; | |
791 _par_last_scan_rs_times_ms[i] = -666.0; | |
792 _par_last_scan_new_refs_times_ms[i] = -666.0; | |
793 _par_last_obj_copy_times_ms[i] = -666.0; | |
794 _par_last_termination_times_ms[i] = -666.0; | |
795 } | |
796 #endif | |
797 | |
798 for (int i = 0; i < _aux_num; ++i) { | |
799 _cur_aux_times_ms[i] = 0.0; | |
800 _cur_aux_times_set[i] = false; | |
801 } | |
802 | |
803 _satb_drain_time_set = false; | |
804 _last_satb_drain_processed_buffers = -1; | |
805 | |
806 if (in_young_gc_mode()) | |
807 _last_young_gc_full = false; | |
808 | |
809 // do that for any other surv rate groups | |
810 _short_lived_surv_rate_group->stop_adding_regions(); | |
1282 | 811 _survivors_age_table.clear(); |
545 | 812 |
342 | 813 assert( verify_young_ages(), "region age verification" ); |
814 } | |
815 | |
816 void G1CollectorPolicy::record_mark_closure_time(double mark_closure_time_ms) { | |
817 _mark_closure_time_ms = mark_closure_time_ms; | |
818 } | |
819 | |
820 void G1CollectorPolicy::record_concurrent_mark_init_start() { | |
821 _mark_init_start_sec = os::elapsedTime(); | |
822 guarantee(!in_young_gc_mode(), "should not do be here in young GC mode"); | |
823 } | |
824 | |
825 void G1CollectorPolicy::record_concurrent_mark_init_end_pre(double | |
826 mark_init_elapsed_time_ms) { | |
827 _during_marking = true; | |
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828 assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
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829 clear_during_initial_mark_pause(); |
342 | 830 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
831 } | |
832 | |
833 void G1CollectorPolicy::record_concurrent_mark_init_end() { | |
834 double end_time_sec = os::elapsedTime(); | |
835 double elapsed_time_ms = (end_time_sec - _mark_init_start_sec) * 1000.0; | |
836 _concurrent_mark_init_times_ms->add(elapsed_time_ms); | |
837 record_concurrent_mark_init_end_pre(elapsed_time_ms); | |
838 | |
839 _mmu_tracker->add_pause(_mark_init_start_sec, end_time_sec, true); | |
840 } | |
841 | |
842 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
843 _mark_remark_start_sec = os::elapsedTime(); | |
844 _during_marking = false; | |
845 } | |
846 | |
847 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
848 double end_time_sec = os::elapsedTime(); | |
849 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
850 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
851 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
852 _prev_collection_pause_end_ms += elapsed_time_ms; | |
853 | |
854 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
855 } | |
856 | |
857 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
858 _mark_cleanup_start_sec = os::elapsedTime(); | |
859 } | |
860 | |
861 void | |
862 G1CollectorPolicy::record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
863 size_t max_live_bytes) { | |
864 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
865 record_concurrent_mark_cleanup_end_work2(); | |
866 } | |
867 | |
868 void | |
869 G1CollectorPolicy:: | |
870 record_concurrent_mark_cleanup_end_work1(size_t freed_bytes, | |
871 size_t max_live_bytes) { | |
872 if (_n_marks < 2) _n_marks++; | |
873 if (G1PolicyVerbose > 0) | |
874 gclog_or_tty->print_cr("At end of marking, max_live is " SIZE_FORMAT " MB " | |
875 " (of " SIZE_FORMAT " MB heap).", | |
876 max_live_bytes/M, _g1->capacity()/M); | |
877 } | |
878 | |
879 // The important thing about this is that it includes "os::elapsedTime". | |
880 void G1CollectorPolicy::record_concurrent_mark_cleanup_end_work2() { | |
881 double end_time_sec = os::elapsedTime(); | |
882 double elapsed_time_ms = (end_time_sec - _mark_cleanup_start_sec)*1000.0; | |
883 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
884 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
885 _prev_collection_pause_end_ms += elapsed_time_ms; | |
886 | |
887 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_time_sec, true); | |
888 | |
889 _num_markings++; | |
890 | |
891 // We did a marking, so reset the "since_last_mark" variables. | |
892 double considerConcMarkCost = 1.0; | |
893 // If there are available processors, concurrent activity is free... | |
894 if (Threads::number_of_non_daemon_threads() * 2 < | |
895 os::active_processor_count()) { | |
896 considerConcMarkCost = 0.0; | |
897 } | |
898 _n_pauses_at_mark_end = _n_pauses; | |
899 _n_marks_since_last_pause++; | |
900 } | |
901 | |
902 void | |
903 G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { | |
904 if (in_young_gc_mode()) { | |
905 _should_revert_to_full_young_gcs = false; | |
906 _last_full_young_gc = true; | |
907 _in_marking_window = false; | |
908 if (adaptive_young_list_length()) | |
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909 calculate_young_list_target_length(); |
342 | 910 } |
911 } | |
912 | |
913 void G1CollectorPolicy::record_concurrent_pause() { | |
914 if (_stop_world_start > 0.0) { | |
915 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
916 _all_yield_times_ms->add(yield_ms); | |
917 } | |
918 } | |
919 | |
920 void G1CollectorPolicy::record_concurrent_pause_end() { | |
921 } | |
922 | |
923 void G1CollectorPolicy::record_collection_pause_end_CH_strong_roots() { | |
924 _cur_CH_strong_roots_end_sec = os::elapsedTime(); | |
925 _cur_CH_strong_roots_dur_ms = | |
926 (_cur_CH_strong_roots_end_sec - _cur_collection_start_sec) * 1000.0; | |
927 } | |
928 | |
929 void G1CollectorPolicy::record_collection_pause_end_G1_strong_roots() { | |
930 _cur_G1_strong_roots_end_sec = os::elapsedTime(); | |
931 _cur_G1_strong_roots_dur_ms = | |
932 (_cur_G1_strong_roots_end_sec - _cur_CH_strong_roots_end_sec) * 1000.0; | |
933 } | |
934 | |
935 template<class T> | |
936 T sum_of(T* sum_arr, int start, int n, int N) { | |
937 T sum = (T)0; | |
938 for (int i = 0; i < n; i++) { | |
939 int j = (start + i) % N; | |
940 sum += sum_arr[j]; | |
941 } | |
942 return sum; | |
943 } | |
944 | |
945 void G1CollectorPolicy::print_par_stats (int level, | |
946 const char* str, | |
947 double* data, | |
948 bool summary) { | |
949 double min = data[0], max = data[0]; | |
950 double total = 0.0; | |
951 int j; | |
952 for (j = 0; j < level; ++j) | |
953 gclog_or_tty->print(" "); | |
954 gclog_or_tty->print("[%s (ms):", str); | |
955 for (uint i = 0; i < ParallelGCThreads; ++i) { | |
956 double val = data[i]; | |
957 if (val < min) | |
958 min = val; | |
959 if (val > max) | |
960 max = val; | |
961 total += val; | |
962 gclog_or_tty->print(" %3.1lf", val); | |
963 } | |
964 if (summary) { | |
965 gclog_or_tty->print_cr(""); | |
966 double avg = total / (double) ParallelGCThreads; | |
967 gclog_or_tty->print(" "); | |
968 for (j = 0; j < level; ++j) | |
969 gclog_or_tty->print(" "); | |
970 gclog_or_tty->print("Avg: %5.1lf, Min: %5.1lf, Max: %5.1lf", | |
971 avg, min, max); | |
972 } | |
973 gclog_or_tty->print_cr("]"); | |
974 } | |
975 | |
976 void G1CollectorPolicy::print_par_buffers (int level, | |
977 const char* str, | |
978 double* data, | |
979 bool summary) { | |
980 double min = data[0], max = data[0]; | |
981 double total = 0.0; | |
982 int j; | |
983 for (j = 0; j < level; ++j) | |
984 gclog_or_tty->print(" "); | |
985 gclog_or_tty->print("[%s :", str); | |
986 for (uint i = 0; i < ParallelGCThreads; ++i) { | |
987 double val = data[i]; | |
988 if (val < min) | |
989 min = val; | |
990 if (val > max) | |
991 max = val; | |
992 total += val; | |
993 gclog_or_tty->print(" %d", (int) val); | |
994 } | |
995 if (summary) { | |
996 gclog_or_tty->print_cr(""); | |
997 double avg = total / (double) ParallelGCThreads; | |
998 gclog_or_tty->print(" "); | |
999 for (j = 0; j < level; ++j) | |
1000 gclog_or_tty->print(" "); | |
1001 gclog_or_tty->print("Sum: %d, Avg: %d, Min: %d, Max: %d", | |
1002 (int)total, (int)avg, (int)min, (int)max); | |
1003 } | |
1004 gclog_or_tty->print_cr("]"); | |
1005 } | |
1006 | |
1007 void G1CollectorPolicy::print_stats (int level, | |
1008 const char* str, | |
1009 double value) { | |
1010 for (int j = 0; j < level; ++j) | |
1011 gclog_or_tty->print(" "); | |
1012 gclog_or_tty->print_cr("[%s: %5.1lf ms]", str, value); | |
1013 } | |
1014 | |
1015 void G1CollectorPolicy::print_stats (int level, | |
1016 const char* str, | |
1017 int value) { | |
1018 for (int j = 0; j < level; ++j) | |
1019 gclog_or_tty->print(" "); | |
1020 gclog_or_tty->print_cr("[%s: %d]", str, value); | |
1021 } | |
1022 | |
1023 double G1CollectorPolicy::avg_value (double* data) { | |
1024 if (ParallelGCThreads > 0) { | |
1025 double ret = 0.0; | |
1026 for (uint i = 0; i < ParallelGCThreads; ++i) | |
1027 ret += data[i]; | |
1028 return ret / (double) ParallelGCThreads; | |
1029 } else { | |
1030 return data[0]; | |
1031 } | |
1032 } | |
1033 | |
1034 double G1CollectorPolicy::max_value (double* data) { | |
1035 if (ParallelGCThreads > 0) { | |
1036 double ret = data[0]; | |
1037 for (uint i = 1; i < ParallelGCThreads; ++i) | |
1038 if (data[i] > ret) | |
1039 ret = data[i]; | |
1040 return ret; | |
1041 } else { | |
1042 return data[0]; | |
1043 } | |
1044 } | |
1045 | |
1046 double G1CollectorPolicy::sum_of_values (double* data) { | |
1047 if (ParallelGCThreads > 0) { | |
1048 double sum = 0.0; | |
1049 for (uint i = 0; i < ParallelGCThreads; i++) | |
1050 sum += data[i]; | |
1051 return sum; | |
1052 } else { | |
1053 return data[0]; | |
1054 } | |
1055 } | |
1056 | |
1057 double G1CollectorPolicy::max_sum (double* data1, | |
1058 double* data2) { | |
1059 double ret = data1[0] + data2[0]; | |
1060 | |
1061 if (ParallelGCThreads > 0) { | |
1062 for (uint i = 1; i < ParallelGCThreads; ++i) { | |
1063 double data = data1[i] + data2[i]; | |
1064 if (data > ret) | |
1065 ret = data; | |
1066 } | |
1067 } | |
1068 return ret; | |
1069 } | |
1070 | |
1071 // Anything below that is considered to be zero | |
1072 #define MIN_TIMER_GRANULARITY 0.0000001 | |
1073 | |
677 | 1074 void G1CollectorPolicy::record_collection_pause_end(bool abandoned) { |
342 | 1075 double end_time_sec = os::elapsedTime(); |
1076 double elapsed_ms = _last_pause_time_ms; | |
1077 bool parallel = ParallelGCThreads > 0; | |
1078 double evac_ms = (end_time_sec - _cur_G1_strong_roots_end_sec) * 1000.0; | |
1079 size_t rs_size = | |
1080 _cur_collection_pause_used_regions_at_start - collection_set_size(); | |
1081 size_t cur_used_bytes = _g1->used(); | |
1082 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
1083 bool last_pause_included_initial_mark = false; | |
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1084 bool update_stats = !abandoned && !_g1->evacuation_failed(); |
342 | 1085 |
1086 #ifndef PRODUCT | |
1087 if (G1YoungSurvRateVerbose) { | |
1088 gclog_or_tty->print_cr(""); | |
1089 _short_lived_surv_rate_group->print(); | |
1090 // do that for any other surv rate groups too | |
1091 } | |
1092 #endif // PRODUCT | |
1093 | |
1094 if (in_young_gc_mode()) { | |
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1095 last_pause_included_initial_mark = during_initial_mark_pause(); |
342 | 1096 if (last_pause_included_initial_mark) |
1097 record_concurrent_mark_init_end_pre(0.0); | |
1098 | |
1099 size_t min_used_targ = | |
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1100 (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
342 | 1101 |
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1102 |
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1103 if (!_g1->mark_in_progress() && !_last_full_young_gc) { |
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1104 assert(!last_pause_included_initial_mark, "invariant"); |
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1105 if (cur_used_bytes > min_used_targ && |
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1106 cur_used_bytes > _prev_collection_pause_used_at_end_bytes) { |
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1107 assert(!during_initial_mark_pause(), "we should not see this here"); |
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1108 |
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1109 // Note: this might have already been set, if during the last |
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1110 // pause we decided to start a cycle but at the beginning of |
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1111 // this pause we decided to postpone it. That's OK. |
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1112 set_initiate_conc_mark_if_possible(); |
342 | 1113 } |
1114 } | |
1115 | |
1116 _prev_collection_pause_used_at_end_bytes = cur_used_bytes; | |
1117 } | |
1118 | |
1119 _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0, | |
1120 end_time_sec, false); | |
1121 | |
1122 guarantee(_cur_collection_pause_used_regions_at_start >= | |
1123 collection_set_size(), | |
1124 "Negative RS size?"); | |
1125 | |
1126 // This assert is exempted when we're doing parallel collection pauses, | |
1127 // because the fragmentation caused by the parallel GC allocation buffers | |
1128 // can lead to more memory being used during collection than was used | |
1129 // before. Best leave this out until the fragmentation problem is fixed. | |
1130 // Pauses in which evacuation failed can also lead to negative | |
1131 // collections, since no space is reclaimed from a region containing an | |
1132 // object whose evacuation failed. | |
1133 // Further, we're now always doing parallel collection. But I'm still | |
1134 // leaving this here as a placeholder for a more precise assertion later. | |
1135 // (DLD, 10/05.) | |
1136 assert((true || parallel) // Always using GC LABs now. | |
1137 || _g1->evacuation_failed() | |
1138 || _cur_collection_pause_used_at_start_bytes >= cur_used_bytes, | |
1139 "Negative collection"); | |
1140 | |
1141 size_t freed_bytes = | |
1142 _cur_collection_pause_used_at_start_bytes - cur_used_bytes; | |
1143 size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; | |
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1144 |
342 | 1145 double survival_fraction = |
1146 (double)surviving_bytes/ | |
1147 (double)_collection_set_bytes_used_before; | |
1148 | |
1149 _n_pauses++; | |
1150 | |
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1151 if (update_stats) { |
342 | 1152 _recent_CH_strong_roots_times_ms->add(_cur_CH_strong_roots_dur_ms); |
1153 _recent_G1_strong_roots_times_ms->add(_cur_G1_strong_roots_dur_ms); | |
1154 _recent_evac_times_ms->add(evac_ms); | |
1155 _recent_pause_times_ms->add(elapsed_ms); | |
1156 | |
1157 _recent_rs_sizes->add(rs_size); | |
1158 | |
1159 // We exempt parallel collection from this check because Alloc Buffer | |
1160 // fragmentation can produce negative collections. Same with evac | |
1161 // failure. | |
1162 // Further, we're now always doing parallel collection. But I'm still | |
1163 // leaving this here as a placeholder for a more precise assertion later. | |
1164 // (DLD, 10/05. | |
1165 assert((true || parallel) | |
1166 || _g1->evacuation_failed() | |
1167 || surviving_bytes <= _collection_set_bytes_used_before, | |
1168 "Or else negative collection!"); | |
1169 _recent_CS_bytes_used_before->add(_collection_set_bytes_used_before); | |
1170 _recent_CS_bytes_surviving->add(surviving_bytes); | |
1171 | |
1172 // this is where we update the allocation rate of the application | |
1173 double app_time_ms = | |
1174 (_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms); | |
1175 if (app_time_ms < MIN_TIMER_GRANULARITY) { | |
1176 // This usually happens due to the timer not having the required | |
1177 // granularity. Some Linuxes are the usual culprits. | |
1178 // We'll just set it to something (arbitrarily) small. | |
1179 app_time_ms = 1.0; | |
1180 } | |
1181 size_t regions_allocated = | |
1182 (_region_num_young - _prev_region_num_young) + | |
1183 (_region_num_tenured - _prev_region_num_tenured); | |
1184 double alloc_rate_ms = (double) regions_allocated / app_time_ms; | |
1185 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
1186 _prev_region_num_young = _region_num_young; | |
1187 _prev_region_num_tenured = _region_num_tenured; | |
1188 | |
1189 double interval_ms = | |
1190 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
1191 update_recent_gc_times(end_time_sec, elapsed_ms); | |
1192 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; | |
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1193 if (recent_avg_pause_time_ratio() < 0.0 || |
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1194 (recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
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1195 #ifndef PRODUCT |
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1196 // Dump info to allow post-facto debugging |
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1197 gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
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1198 gclog_or_tty->print_cr("-------------------------------------------"); |
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1199 gclog_or_tty->print_cr("Recent GC Times (ms):"); |
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1200 _recent_gc_times_ms->dump(); |
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1201 gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
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1202 _recent_prev_end_times_for_all_gcs_sec->dump(); |
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1203 gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
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1204 _recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
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1205 // In debug mode, terminate the JVM if the user wants to debug at this point. |
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1206 assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
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1207 #endif // !PRODUCT |
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1208 // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
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1209 // CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
1086
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1210 if (_recent_avg_pause_time_ratio < 0.0) { |
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1211 _recent_avg_pause_time_ratio = 0.0; |
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1212 } else { |
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1213 assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
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1214 _recent_avg_pause_time_ratio = 1.0; |
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6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
1043
diff
changeset
|
1215 } |
89f1b9ae8991
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
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parents:
1043
diff
changeset
|
1216 } |
342 | 1217 } |
1218 | |
1219 if (G1PolicyVerbose > 1) { | |
1220 gclog_or_tty->print_cr(" Recording collection pause(%d)", _n_pauses); | |
1221 } | |
1222 | |
1223 PauseSummary* summary; | |
677 | 1224 if (abandoned) { |
1225 summary = _abandoned_summary; | |
1226 } else { | |
1227 summary = _summary; | |
342 | 1228 } |
1229 | |
1230 double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); | |
1231 double mark_stack_scan_time = avg_value(_par_last_mark_stack_scan_times_ms); | |
1232 double update_rs_time = avg_value(_par_last_update_rs_times_ms); | |
1233 double update_rs_processed_buffers = | |
1234 sum_of_values(_par_last_update_rs_processed_buffers); | |
1235 double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); | |
1236 double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); | |
1237 double termination_time = avg_value(_par_last_termination_times_ms); | |
1238 | |
648
2314b7336582
6820321: G1: Error: guarantee(check_nums(total, n, parts), "all seq lengths should match")
tonyp
parents:
640
diff
changeset
|
1239 double parallel_other_time = _cur_collection_par_time_ms - |
2314b7336582
6820321: G1: Error: guarantee(check_nums(total, n, parts), "all seq lengths should match")
tonyp
parents:
640
diff
changeset
|
1240 (update_rs_time + ext_root_scan_time + mark_stack_scan_time + |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1241 scan_rs_time + obj_copy_time + termination_time); |
595
3698e8f47799
6804746: G1: guarantee(variance() > -1.0,"variance should be >= 0") (due to evacuation failure)
tonyp
parents:
547
diff
changeset
|
1242 if (update_stats) { |
342 | 1243 MainBodySummary* body_summary = summary->main_body_summary(); |
1244 guarantee(body_summary != NULL, "should not be null!"); | |
1245 | |
1246 if (_satb_drain_time_set) | |
1247 body_summary->record_satb_drain_time_ms(_cur_satb_drain_time_ms); | |
1248 else | |
1249 body_summary->record_satb_drain_time_ms(0.0); | |
1250 body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); | |
1251 body_summary->record_mark_stack_scan_time_ms(mark_stack_scan_time); | |
1252 body_summary->record_update_rs_time_ms(update_rs_time); | |
1253 body_summary->record_scan_rs_time_ms(scan_rs_time); | |
1254 body_summary->record_obj_copy_time_ms(obj_copy_time); | |
1255 if (parallel) { | |
1256 body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); | |
1257 body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); | |
1258 body_summary->record_termination_time_ms(termination_time); | |
1259 body_summary->record_parallel_other_time_ms(parallel_other_time); | |
1260 } | |
1261 body_summary->record_mark_closure_time_ms(_mark_closure_time_ms); | |
1262 } | |
1263 | |
1264 if (G1PolicyVerbose > 1) { | |
1265 gclog_or_tty->print_cr(" ET: %10.6f ms (avg: %10.6f ms)\n" | |
1266 " CH Strong: %10.6f ms (avg: %10.6f ms)\n" | |
1267 " G1 Strong: %10.6f ms (avg: %10.6f ms)\n" | |
1268 " Evac: %10.6f ms (avg: %10.6f ms)\n" | |
1269 " ET-RS: %10.6f ms (avg: %10.6f ms)\n" | |
1270 " |RS|: " SIZE_FORMAT, | |
1271 elapsed_ms, recent_avg_time_for_pauses_ms(), | |
1272 _cur_CH_strong_roots_dur_ms, recent_avg_time_for_CH_strong_ms(), | |
1273 _cur_G1_strong_roots_dur_ms, recent_avg_time_for_G1_strong_ms(), | |
1274 evac_ms, recent_avg_time_for_evac_ms(), | |
1275 scan_rs_time, | |
1276 recent_avg_time_for_pauses_ms() - | |
1277 recent_avg_time_for_G1_strong_ms(), | |
1278 rs_size); | |
1279 | |
1280 gclog_or_tty->print_cr(" Used at start: " SIZE_FORMAT"K" | |
1281 " At end " SIZE_FORMAT "K\n" | |
1282 " garbage : " SIZE_FORMAT "K" | |
1283 " of " SIZE_FORMAT "K\n" | |
1284 " survival : %6.2f%% (%6.2f%% avg)", | |
1285 _cur_collection_pause_used_at_start_bytes/K, | |
1286 _g1->used()/K, freed_bytes/K, | |
1287 _collection_set_bytes_used_before/K, | |
1288 survival_fraction*100.0, | |
1289 recent_avg_survival_fraction()*100.0); | |
1290 gclog_or_tty->print_cr(" Recent %% gc pause time: %6.2f", | |
1291 recent_avg_pause_time_ratio() * 100.0); | |
1292 } | |
1293 | |
1294 double other_time_ms = elapsed_ms; | |
1295 | |
1296 if (!abandoned) { | |
1297 if (_satb_drain_time_set) | |
1298 other_time_ms -= _cur_satb_drain_time_ms; | |
1299 | |
1300 if (parallel) | |
1301 other_time_ms -= _cur_collection_par_time_ms + _cur_clear_ct_time_ms; | |
1302 else | |
1303 other_time_ms -= | |
1304 update_rs_time + | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1305 ext_root_scan_time + mark_stack_scan_time + |
342 | 1306 scan_rs_time + obj_copy_time; |
1307 } | |
1308 | |
1309 if (PrintGCDetails) { | |
1310 gclog_or_tty->print_cr("%s%s, %1.8lf secs]", | |
677 | 1311 abandoned ? " (abandoned)" : "", |
342 | 1312 (last_pause_included_initial_mark) ? " (initial-mark)" : "", |
1313 elapsed_ms / 1000.0); | |
1314 | |
1315 if (!abandoned) { | |
677 | 1316 if (_satb_drain_time_set) { |
342 | 1317 print_stats(1, "SATB Drain Time", _cur_satb_drain_time_ms); |
677 | 1318 } |
1319 if (_last_satb_drain_processed_buffers >= 0) { | |
342 | 1320 print_stats(2, "Processed Buffers", _last_satb_drain_processed_buffers); |
677 | 1321 } |
1322 if (parallel) { | |
1323 print_stats(1, "Parallel Time", _cur_collection_par_time_ms); | |
1324 print_par_stats(2, "Update RS (Start)", _par_last_update_rs_start_times_ms, false); | |
1325 print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); | |
794 | 1326 print_par_buffers(3, "Processed Buffers", |
1327 _par_last_update_rs_processed_buffers, true); | |
342 | 1328 print_par_stats(2, "Ext Root Scanning", _par_last_ext_root_scan_times_ms); |
1329 print_par_stats(2, "Mark Stack Scanning", _par_last_mark_stack_scan_times_ms); | |
1330 print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms); | |
1331 print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms); | |
1332 print_par_stats(2, "Termination", _par_last_termination_times_ms); | |
1333 print_stats(2, "Other", parallel_other_time); | |
1334 print_stats(1, "Clear CT", _cur_clear_ct_time_ms); | |
677 | 1335 } else { |
1336 print_stats(1, "Update RS", update_rs_time); | |
794 | 1337 print_stats(2, "Processed Buffers", |
1338 (int)update_rs_processed_buffers); | |
342 | 1339 print_stats(1, "Ext Root Scanning", ext_root_scan_time); |
1340 print_stats(1, "Mark Stack Scanning", mark_stack_scan_time); | |
1341 print_stats(1, "Scan RS", scan_rs_time); | |
1342 print_stats(1, "Object Copying", obj_copy_time); | |
1343 } | |
1344 } | |
890
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
changeset
|
1345 #ifndef PRODUCT |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
changeset
|
1346 print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms); |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
changeset
|
1347 print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms); |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
changeset
|
1348 print_stats(1, "Min Clear CC", _min_clear_cc_time_ms); |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
changeset
|
1349 print_stats(1, "Max Clear CC", _max_clear_cc_time_ms); |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
changeset
|
1350 if (_num_cc_clears > 0) { |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
changeset
|
1351 print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears)); |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
changeset
|
1352 } |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
changeset
|
1353 #endif |
342 | 1354 print_stats(1, "Other", other_time_ms); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1355 print_stats(2, "Choose CSet", _recorded_young_cset_choice_time_ms); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1356 |
342 | 1357 for (int i = 0; i < _aux_num; ++i) { |
1358 if (_cur_aux_times_set[i]) { | |
1359 char buffer[96]; | |
1360 sprintf(buffer, "Aux%d", i); | |
1361 print_stats(1, buffer, _cur_aux_times_ms[i]); | |
1362 } | |
1363 } | |
1364 } | |
1365 if (PrintGCDetails) | |
1366 gclog_or_tty->print(" ["); | |
1367 if (PrintGC || PrintGCDetails) | |
1368 _g1->print_size_transition(gclog_or_tty, | |
1369 _cur_collection_pause_used_at_start_bytes, | |
1370 _g1->used(), _g1->capacity()); | |
1371 if (PrintGCDetails) | |
1372 gclog_or_tty->print_cr("]"); | |
1373 | |
1374 _all_pause_times_ms->add(elapsed_ms); | |
648
2314b7336582
6820321: G1: Error: guarantee(check_nums(total, n, parts), "all seq lengths should match")
tonyp
parents:
640
diff
changeset
|
1375 if (update_stats) { |
2314b7336582
6820321: G1: Error: guarantee(check_nums(total, n, parts), "all seq lengths should match")
tonyp
parents:
640
diff
changeset
|
1376 summary->record_total_time_ms(elapsed_ms); |
2314b7336582
6820321: G1: Error: guarantee(check_nums(total, n, parts), "all seq lengths should match")
tonyp
parents:
640
diff
changeset
|
1377 summary->record_other_time_ms(other_time_ms); |
2314b7336582
6820321: G1: Error: guarantee(check_nums(total, n, parts), "all seq lengths should match")
tonyp
parents:
640
diff
changeset
|
1378 } |
342 | 1379 for (int i = 0; i < _aux_num; ++i) |
1380 if (_cur_aux_times_set[i]) | |
1381 _all_aux_times_ms[i].add(_cur_aux_times_ms[i]); | |
1382 | |
1383 // Reset marks-between-pauses counter. | |
1384 _n_marks_since_last_pause = 0; | |
1385 | |
1386 // Update the efficiency-since-mark vars. | |
1387 double proc_ms = elapsed_ms * (double) _parallel_gc_threads; | |
1388 if (elapsed_ms < MIN_TIMER_GRANULARITY) { | |
1389 // This usually happens due to the timer not having the required | |
1390 // granularity. Some Linuxes are the usual culprits. | |
1391 // We'll just set it to something (arbitrarily) small. | |
1392 proc_ms = 1.0; | |
1393 } | |
1394 double cur_efficiency = (double) freed_bytes / proc_ms; | |
1395 | |
1396 bool new_in_marking_window = _in_marking_window; | |
1397 bool new_in_marking_window_im = false; | |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
changeset
|
1398 if (during_initial_mark_pause()) { |
342 | 1399 new_in_marking_window = true; |
1400 new_in_marking_window_im = true; | |
1401 } | |
1402 | |
1403 if (in_young_gc_mode()) { | |
1404 if (_last_full_young_gc) { | |
1405 set_full_young_gcs(false); | |
1406 _last_full_young_gc = false; | |
1407 } | |
1408 | |
1409 if ( !_last_young_gc_full ) { | |
1410 if ( _should_revert_to_full_young_gcs || | |
1411 _known_garbage_ratio < 0.05 || | |
1412 (adaptive_young_list_length() && | |
1413 (get_gc_eff_factor() * cur_efficiency < predict_young_gc_eff())) ) { | |
1414 set_full_young_gcs(true); | |
1415 } | |
1416 } | |
1417 _should_revert_to_full_young_gcs = false; | |
1418 | |
1419 if (_last_young_gc_full && !_during_marking) | |
1420 _young_gc_eff_seq->add(cur_efficiency); | |
1421 } | |
1422 | |
1423 _short_lived_surv_rate_group->start_adding_regions(); | |
1424 // do that for any other surv rate groupsx | |
1425 | |
1426 // <NEW PREDICTION> | |
1427 | |
677 | 1428 if (update_stats) { |
342 | 1429 double pause_time_ms = elapsed_ms; |
1430 | |
1431 size_t diff = 0; | |
1432 if (_max_pending_cards >= _pending_cards) | |
1433 diff = _max_pending_cards - _pending_cards; | |
1434 _pending_card_diff_seq->add((double) diff); | |
1435 | |
1436 double cost_per_card_ms = 0.0; | |
1437 if (_pending_cards > 0) { | |
1438 cost_per_card_ms = update_rs_time / (double) _pending_cards; | |
1439 _cost_per_card_ms_seq->add(cost_per_card_ms); | |
1440 } | |
1441 | |
1442 size_t cards_scanned = _g1->cards_scanned(); | |
1443 | |
1444 double cost_per_entry_ms = 0.0; | |
1445 if (cards_scanned > 10) { | |
1446 cost_per_entry_ms = scan_rs_time / (double) cards_scanned; | |
1447 if (_last_young_gc_full) | |
1448 _cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1449 else | |
1450 _partially_young_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1451 } | |
1452 | |
1453 if (_max_rs_lengths > 0) { | |
1454 double cards_per_entry_ratio = | |
1455 (double) cards_scanned / (double) _max_rs_lengths; | |
1456 if (_last_young_gc_full) | |
1457 _fully_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1458 else | |
1459 _partially_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1460 } | |
1461 | |
1462 size_t rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; | |
1463 if (rs_length_diff >= 0) | |
1464 _rs_length_diff_seq->add((double) rs_length_diff); | |
1465 | |
1466 size_t copied_bytes = surviving_bytes; | |
1467 double cost_per_byte_ms = 0.0; | |
1468 if (copied_bytes > 0) { | |
1469 cost_per_byte_ms = obj_copy_time / (double) copied_bytes; | |
1470 if (_in_marking_window) | |
1471 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); | |
1472 else | |
1473 _cost_per_byte_ms_seq->add(cost_per_byte_ms); | |
1474 } | |
1475 | |
1476 double all_other_time_ms = pause_time_ms - | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1477 (update_rs_time + scan_rs_time + obj_copy_time + |
342 | 1478 _mark_closure_time_ms + termination_time); |
1479 | |
1480 double young_other_time_ms = 0.0; | |
1481 if (_recorded_young_regions > 0) { | |
1482 young_other_time_ms = | |
1483 _recorded_young_cset_choice_time_ms + | |
1484 _recorded_young_free_cset_time_ms; | |
1485 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / | |
1486 (double) _recorded_young_regions); | |
1487 } | |
1488 double non_young_other_time_ms = 0.0; | |
1489 if (_recorded_non_young_regions > 0) { | |
1490 non_young_other_time_ms = | |
1491 _recorded_non_young_cset_choice_time_ms + | |
1492 _recorded_non_young_free_cset_time_ms; | |
1493 | |
1494 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
1495 (double) _recorded_non_young_regions); | |
1496 } | |
1497 | |
1498 double constant_other_time_ms = all_other_time_ms - | |
1499 (young_other_time_ms + non_young_other_time_ms); | |
1500 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
1501 | |
1502 double survival_ratio = 0.0; | |
1503 if (_bytes_in_collection_set_before_gc > 0) { | |
1504 survival_ratio = (double) bytes_in_to_space_during_gc() / | |
1505 (double) _bytes_in_collection_set_before_gc; | |
1506 } | |
1507 | |
1508 _pending_cards_seq->add((double) _pending_cards); | |
1509 _scanned_cards_seq->add((double) cards_scanned); | |
1510 _rs_lengths_seq->add((double) _max_rs_lengths); | |
1511 | |
1512 double expensive_region_limit_ms = | |
751 | 1513 (double) MaxGCPauseMillis - predict_constant_other_time_ms(); |
342 | 1514 if (expensive_region_limit_ms < 0.0) { |
1515 // this means that the other time was predicted to be longer than | |
1516 // than the max pause time | |
751 | 1517 expensive_region_limit_ms = (double) MaxGCPauseMillis; |
342 | 1518 } |
1519 _expensive_region_limit_ms = expensive_region_limit_ms; | |
1520 | |
1521 if (PREDICTIONS_VERBOSE) { | |
1522 gclog_or_tty->print_cr(""); | |
1523 gclog_or_tty->print_cr("PREDICTIONS %1.4lf %d " | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1524 "REGIONS %d %d %d " |
342 | 1525 "PENDING_CARDS %d %d " |
1526 "CARDS_SCANNED %d %d " | |
1527 "RS_LENGTHS %d %d " | |
1528 "RS_UPDATE %1.6lf %1.6lf RS_SCAN %1.6lf %1.6lf " | |
1529 "SURVIVAL_RATIO %1.6lf %1.6lf " | |
1530 "OBJECT_COPY %1.6lf %1.6lf OTHER_CONSTANT %1.6lf %1.6lf " | |
1531 "OTHER_YOUNG %1.6lf %1.6lf " | |
1532 "OTHER_NON_YOUNG %1.6lf %1.6lf " | |
1533 "VTIME_DIFF %1.6lf TERMINATION %1.6lf " | |
1534 "ELAPSED %1.6lf %1.6lf ", | |
1535 _cur_collection_start_sec, | |
1536 (!_last_young_gc_full) ? 2 : | |
1537 (last_pause_included_initial_mark) ? 1 : 0, | |
1538 _recorded_region_num, | |
1539 _recorded_young_regions, | |
1540 _recorded_non_young_regions, | |
1541 _predicted_pending_cards, _pending_cards, | |
1542 _predicted_cards_scanned, cards_scanned, | |
1543 _predicted_rs_lengths, _max_rs_lengths, | |
1544 _predicted_rs_update_time_ms, update_rs_time, | |
1545 _predicted_rs_scan_time_ms, scan_rs_time, | |
1546 _predicted_survival_ratio, survival_ratio, | |
1547 _predicted_object_copy_time_ms, obj_copy_time, | |
1548 _predicted_constant_other_time_ms, constant_other_time_ms, | |
1549 _predicted_young_other_time_ms, young_other_time_ms, | |
1550 _predicted_non_young_other_time_ms, | |
1551 non_young_other_time_ms, | |
1552 _vtime_diff_ms, termination_time, | |
1553 _predicted_pause_time_ms, elapsed_ms); | |
1554 } | |
1555 | |
1556 if (G1PolicyVerbose > 0) { | |
1557 gclog_or_tty->print_cr("Pause Time, predicted: %1.4lfms (predicted %s), actual: %1.4lfms", | |
1558 _predicted_pause_time_ms, | |
1559 (_within_target) ? "within" : "outside", | |
1560 elapsed_ms); | |
1561 } | |
1562 | |
1563 } | |
1564 | |
1565 _in_marking_window = new_in_marking_window; | |
1566 _in_marking_window_im = new_in_marking_window_im; | |
1567 _free_regions_at_end_of_collection = _g1->free_regions(); | |
1568 calculate_young_list_min_length(); | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1569 calculate_young_list_target_length(); |
342 | 1570 |
1111 | 1571 // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
1282 | 1572 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
1111 | 1573 adjust_concurrent_refinement(update_rs_time, update_rs_processed_buffers, update_rs_time_goal_ms); |
342 | 1574 // </NEW PREDICTION> |
1575 | |
1576 _target_pause_time_ms = -1.0; | |
1577 } | |
1578 | |
1579 // <NEW PREDICTION> | |
1580 | |
1111 | 1581 void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
1582 double update_rs_processed_buffers, | |
1583 double goal_ms) { | |
1584 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
1585 ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); | |
1586 | |
1282 | 1587 if (G1UseAdaptiveConcRefinement) { |
1111 | 1588 const int k_gy = 3, k_gr = 6; |
1589 const double inc_k = 1.1, dec_k = 0.9; | |
1590 | |
1591 int g = cg1r->green_zone(); | |
1592 if (update_rs_time > goal_ms) { | |
1593 g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. | |
1594 } else { | |
1595 if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { | |
1596 g = (int)MAX2(g * inc_k, g + 1.0); | |
1597 } | |
1598 } | |
1599 // Change the refinement threads params | |
1600 cg1r->set_green_zone(g); | |
1601 cg1r->set_yellow_zone(g * k_gy); | |
1602 cg1r->set_red_zone(g * k_gr); | |
1603 cg1r->reinitialize_threads(); | |
1604 | |
1605 int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); | |
1606 int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, | |
1607 cg1r->yellow_zone()); | |
1608 // Change the barrier params | |
1609 dcqs.set_process_completed_threshold(processing_threshold); | |
1610 dcqs.set_max_completed_queue(cg1r->red_zone()); | |
1611 } | |
1612 | |
1613 int curr_queue_size = dcqs.completed_buffers_num(); | |
1614 if (curr_queue_size >= cg1r->yellow_zone()) { | |
1615 dcqs.set_completed_queue_padding(curr_queue_size); | |
1616 } else { | |
1617 dcqs.set_completed_queue_padding(0); | |
1618 } | |
1619 dcqs.notify_if_necessary(); | |
1620 } | |
1621 | |
342 | 1622 double |
1623 G1CollectorPolicy:: | |
1624 predict_young_collection_elapsed_time_ms(size_t adjustment) { | |
1625 guarantee( adjustment == 0 || adjustment == 1, "invariant" ); | |
1626 | |
1627 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
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1628 size_t young_num = g1h->young_list()->length(); |
342 | 1629 if (young_num == 0) |
1630 return 0.0; | |
1631 | |
1632 young_num += adjustment; | |
1633 size_t pending_cards = predict_pending_cards(); | |
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1634 size_t rs_lengths = g1h->young_list()->sampled_rs_lengths() + |
342 | 1635 predict_rs_length_diff(); |
1636 size_t card_num; | |
1637 if (full_young_gcs()) | |
1638 card_num = predict_young_card_num(rs_lengths); | |
1639 else | |
1640 card_num = predict_non_young_card_num(rs_lengths); | |
1641 size_t young_byte_size = young_num * HeapRegion::GrainBytes; | |
1642 double accum_yg_surv_rate = | |
1643 _short_lived_surv_rate_group->accum_surv_rate(adjustment); | |
1644 | |
1645 size_t bytes_to_copy = | |
1646 (size_t) (accum_yg_surv_rate * (double) HeapRegion::GrainBytes); | |
1647 | |
1648 return | |
1649 predict_rs_update_time_ms(pending_cards) + | |
1650 predict_rs_scan_time_ms(card_num) + | |
1651 predict_object_copy_time_ms(bytes_to_copy) + | |
1652 predict_young_other_time_ms(young_num) + | |
1653 predict_constant_other_time_ms(); | |
1654 } | |
1655 | |
1656 double | |
1657 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { | |
1658 size_t rs_length = predict_rs_length_diff(); | |
1659 size_t card_num; | |
1660 if (full_young_gcs()) | |
1661 card_num = predict_young_card_num(rs_length); | |
1662 else | |
1663 card_num = predict_non_young_card_num(rs_length); | |
1664 return predict_base_elapsed_time_ms(pending_cards, card_num); | |
1665 } | |
1666 | |
1667 double | |
1668 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
1669 size_t scanned_cards) { | |
1670 return | |
1671 predict_rs_update_time_ms(pending_cards) + | |
1672 predict_rs_scan_time_ms(scanned_cards) + | |
1673 predict_constant_other_time_ms(); | |
1674 } | |
1675 | |
1676 double | |
1677 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
1678 bool young) { | |
1679 size_t rs_length = hr->rem_set()->occupied(); | |
1680 size_t card_num; | |
1681 if (full_young_gcs()) | |
1682 card_num = predict_young_card_num(rs_length); | |
1683 else | |
1684 card_num = predict_non_young_card_num(rs_length); | |
1685 size_t bytes_to_copy = predict_bytes_to_copy(hr); | |
1686 | |
1687 double region_elapsed_time_ms = | |
1688 predict_rs_scan_time_ms(card_num) + | |
1689 predict_object_copy_time_ms(bytes_to_copy); | |
1690 | |
1691 if (young) | |
1692 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
1693 else | |
1694 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
1695 | |
1696 return region_elapsed_time_ms; | |
1697 } | |
1698 | |
1699 size_t | |
1700 G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { | |
1701 size_t bytes_to_copy; | |
1702 if (hr->is_marked()) | |
1703 bytes_to_copy = hr->max_live_bytes(); | |
1704 else { | |
1705 guarantee( hr->is_young() && hr->age_in_surv_rate_group() != -1, | |
1706 "invariant" ); | |
1707 int age = hr->age_in_surv_rate_group(); | |
545 | 1708 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
342 | 1709 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
1710 } | |
1711 | |
1712 return bytes_to_copy; | |
1713 } | |
1714 | |
1715 void | |
1716 G1CollectorPolicy::start_recording_regions() { | |
1717 _recorded_rs_lengths = 0; | |
1718 _recorded_young_regions = 0; | |
1719 _recorded_non_young_regions = 0; | |
1720 | |
1721 #if PREDICTIONS_VERBOSE | |
1722 _recorded_marked_bytes = 0; | |
1723 _recorded_young_bytes = 0; | |
1724 _predicted_bytes_to_copy = 0; | |
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1725 _predicted_rs_lengths = 0; |
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1726 _predicted_cards_scanned = 0; |
342 | 1727 #endif // PREDICTIONS_VERBOSE |
1728 } | |
1729 | |
1730 void | |
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1731 G1CollectorPolicy::record_cset_region_info(HeapRegion* hr, bool young) { |
342 | 1732 #if PREDICTIONS_VERBOSE |
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1733 if (!young) { |
342 | 1734 _recorded_marked_bytes += hr->max_live_bytes(); |
1735 } | |
1736 _predicted_bytes_to_copy += predict_bytes_to_copy(hr); | |
1737 #endif // PREDICTIONS_VERBOSE | |
1738 | |
1739 size_t rs_length = hr->rem_set()->occupied(); | |
1740 _recorded_rs_lengths += rs_length; | |
1741 } | |
1742 | |
1743 void | |
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1744 G1CollectorPolicy::record_non_young_cset_region(HeapRegion* hr) { |
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1745 assert(!hr->is_young(), "should not call this"); |
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1746 ++_recorded_non_young_regions; |
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1747 record_cset_region_info(hr, false); |
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1748 } |
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1749 |
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1750 void |
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1751 G1CollectorPolicy::set_recorded_young_regions(size_t n_regions) { |
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1752 _recorded_young_regions = n_regions; |
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1753 } |
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1754 |
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1755 void G1CollectorPolicy::set_recorded_young_bytes(size_t bytes) { |
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1756 #if PREDICTIONS_VERBOSE |
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1757 _recorded_young_bytes = bytes; |
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1758 #endif // PREDICTIONS_VERBOSE |
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1759 } |
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1760 |
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1761 void G1CollectorPolicy::set_recorded_rs_lengths(size_t rs_lengths) { |
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1762 _recorded_rs_lengths = rs_lengths; |
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1763 } |
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1764 |
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1765 void G1CollectorPolicy::set_predicted_bytes_to_copy(size_t bytes) { |
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1766 _predicted_bytes_to_copy = bytes; |
342 | 1767 } |
1768 | |
1769 void | |
1770 G1CollectorPolicy::end_recording_regions() { | |
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1771 // The _predicted_pause_time_ms field is referenced in code |
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1772 // not under PREDICTIONS_VERBOSE. Let's initialize it. |
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1773 _predicted_pause_time_ms = -1.0; |
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1774 |
342 | 1775 #if PREDICTIONS_VERBOSE |
1776 _predicted_pending_cards = predict_pending_cards(); | |
1777 _predicted_rs_lengths = _recorded_rs_lengths + predict_rs_length_diff(); | |
1778 if (full_young_gcs()) | |
1779 _predicted_cards_scanned += predict_young_card_num(_predicted_rs_lengths); | |
1780 else | |
1781 _predicted_cards_scanned += | |
1782 predict_non_young_card_num(_predicted_rs_lengths); | |
1783 _recorded_region_num = _recorded_young_regions + _recorded_non_young_regions; | |
1784 | |
1785 _predicted_rs_update_time_ms = | |
1786 predict_rs_update_time_ms(_g1->pending_card_num()); | |
1787 _predicted_rs_scan_time_ms = | |
1788 predict_rs_scan_time_ms(_predicted_cards_scanned); | |
1789 _predicted_object_copy_time_ms = | |
1790 predict_object_copy_time_ms(_predicted_bytes_to_copy); | |
1791 _predicted_constant_other_time_ms = | |
1792 predict_constant_other_time_ms(); | |
1793 _predicted_young_other_time_ms = | |
1794 predict_young_other_time_ms(_recorded_young_regions); | |
1795 _predicted_non_young_other_time_ms = | |
1796 predict_non_young_other_time_ms(_recorded_non_young_regions); | |
1797 | |
1798 _predicted_pause_time_ms = | |
1799 _predicted_rs_update_time_ms + | |
1800 _predicted_rs_scan_time_ms + | |
1801 _predicted_object_copy_time_ms + | |
1802 _predicted_constant_other_time_ms + | |
1803 _predicted_young_other_time_ms + | |
1804 _predicted_non_young_other_time_ms; | |
1805 #endif // PREDICTIONS_VERBOSE | |
1806 } | |
1807 | |
1808 void G1CollectorPolicy::check_if_region_is_too_expensive(double | |
1809 predicted_time_ms) { | |
1810 // I don't think we need to do this when in young GC mode since | |
1811 // marking will be initiated next time we hit the soft limit anyway... | |
1812 if (predicted_time_ms > _expensive_region_limit_ms) { | |
1813 if (!in_young_gc_mode()) { | |
1814 set_full_young_gcs(true); | |
1359
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1815 // We might want to do something different here. However, |
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1816 // right now we don't support the non-generational G1 mode |
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1817 // (and in fact we are planning to remove the associated code, |
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1818 // see CR 6814390). So, let's leave it as is and this will be |
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1819 // removed some time in the future |
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1820 ShouldNotReachHere(); |
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1821 set_during_initial_mark_pause(); |
342 | 1822 } else |
1823 // no point in doing another partial one | |
1824 _should_revert_to_full_young_gcs = true; | |
1825 } | |
1826 } | |
1827 | |
1828 // </NEW PREDICTION> | |
1829 | |
1830 | |
1831 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, | |
1832 double elapsed_ms) { | |
1833 _recent_gc_times_ms->add(elapsed_ms); | |
1834 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
1835 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
1836 } | |
1837 | |
1838 double G1CollectorPolicy::recent_avg_time_for_pauses_ms() { | |
751 | 1839 if (_recent_pause_times_ms->num() == 0) return (double) MaxGCPauseMillis; |
342 | 1840 else return _recent_pause_times_ms->avg(); |
1841 } | |
1842 | |
1843 double G1CollectorPolicy::recent_avg_time_for_CH_strong_ms() { | |
1844 if (_recent_CH_strong_roots_times_ms->num() == 0) | |
751 | 1845 return (double)MaxGCPauseMillis/3.0; |
342 | 1846 else return _recent_CH_strong_roots_times_ms->avg(); |
1847 } | |
1848 | |
1849 double G1CollectorPolicy::recent_avg_time_for_G1_strong_ms() { | |
1850 if (_recent_G1_strong_roots_times_ms->num() == 0) | |
751 | 1851 return (double)MaxGCPauseMillis/3.0; |
342 | 1852 else return _recent_G1_strong_roots_times_ms->avg(); |
1853 } | |
1854 | |
1855 double G1CollectorPolicy::recent_avg_time_for_evac_ms() { | |
751 | 1856 if (_recent_evac_times_ms->num() == 0) return (double)MaxGCPauseMillis/3.0; |
342 | 1857 else return _recent_evac_times_ms->avg(); |
1858 } | |
1859 | |
1860 int G1CollectorPolicy::number_of_recent_gcs() { | |
1861 assert(_recent_CH_strong_roots_times_ms->num() == | |
1862 _recent_G1_strong_roots_times_ms->num(), "Sequence out of sync"); | |
1863 assert(_recent_G1_strong_roots_times_ms->num() == | |
1864 _recent_evac_times_ms->num(), "Sequence out of sync"); | |
1865 assert(_recent_evac_times_ms->num() == | |
1866 _recent_pause_times_ms->num(), "Sequence out of sync"); | |
1867 assert(_recent_pause_times_ms->num() == | |
1868 _recent_CS_bytes_used_before->num(), "Sequence out of sync"); | |
1869 assert(_recent_CS_bytes_used_before->num() == | |
1870 _recent_CS_bytes_surviving->num(), "Sequence out of sync"); | |
1871 return _recent_pause_times_ms->num(); | |
1872 } | |
1873 | |
1874 double G1CollectorPolicy::recent_avg_survival_fraction() { | |
1875 return recent_avg_survival_fraction_work(_recent_CS_bytes_surviving, | |
1876 _recent_CS_bytes_used_before); | |
1877 } | |
1878 | |
1879 double G1CollectorPolicy::last_survival_fraction() { | |
1880 return last_survival_fraction_work(_recent_CS_bytes_surviving, | |
1881 _recent_CS_bytes_used_before); | |
1882 } | |
1883 | |
1884 double | |
1885 G1CollectorPolicy::recent_avg_survival_fraction_work(TruncatedSeq* surviving, | |
1886 TruncatedSeq* before) { | |
1887 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
1888 if (before->sum() > 0.0) { | |
1889 double recent_survival_rate = surviving->sum() / before->sum(); | |
1890 // We exempt parallel collection from this check because Alloc Buffer | |
1891 // fragmentation can produce negative collections. | |
1892 // Further, we're now always doing parallel collection. But I'm still | |
1893 // leaving this here as a placeholder for a more precise assertion later. | |
1894 // (DLD, 10/05.) | |
1895 assert((true || ParallelGCThreads > 0) || | |
1896 _g1->evacuation_failed() || | |
1897 recent_survival_rate <= 1.0, "Or bad frac"); | |
1898 return recent_survival_rate; | |
1899 } else { | |
1900 return 1.0; // Be conservative. | |
1901 } | |
1902 } | |
1903 | |
1904 double | |
1905 G1CollectorPolicy::last_survival_fraction_work(TruncatedSeq* surviving, | |
1906 TruncatedSeq* before) { | |
1907 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
1908 if (surviving->num() > 0 && before->last() > 0.0) { | |
1909 double last_survival_rate = surviving->last() / before->last(); | |
1910 // We exempt parallel collection from this check because Alloc Buffer | |
1911 // fragmentation can produce negative collections. | |
1912 // Further, we're now always doing parallel collection. But I'm still | |
1913 // leaving this here as a placeholder for a more precise assertion later. | |
1914 // (DLD, 10/05.) | |
1915 assert((true || ParallelGCThreads > 0) || | |
1916 last_survival_rate <= 1.0, "Or bad frac"); | |
1917 return last_survival_rate; | |
1918 } else { | |
1919 return 1.0; | |
1920 } | |
1921 } | |
1922 | |
1923 static const int survival_min_obs = 5; | |
1924 static double survival_min_obs_limits[] = { 0.9, 0.7, 0.5, 0.3, 0.1 }; | |
1925 static const double min_survival_rate = 0.1; | |
1926 | |
1927 double | |
1928 G1CollectorPolicy::conservative_avg_survival_fraction_work(double avg, | |
1929 double latest) { | |
1930 double res = avg; | |
1931 if (number_of_recent_gcs() < survival_min_obs) { | |
1932 res = MAX2(res, survival_min_obs_limits[number_of_recent_gcs()]); | |
1933 } | |
1934 res = MAX2(res, latest); | |
1935 res = MAX2(res, min_survival_rate); | |
1936 // In the parallel case, LAB fragmentation can produce "negative | |
1937 // collections"; so can evac failure. Cap at 1.0 | |
1938 res = MIN2(res, 1.0); | |
1939 return res; | |
1940 } | |
1941 | |
1942 size_t G1CollectorPolicy::expansion_amount() { | |
1356 | 1943 if ((recent_avg_pause_time_ratio() * 100.0) > _gc_overhead_perc) { |
751 | 1944 // We will double the existing space, or take |
1945 // G1ExpandByPercentOfAvailable % of the available expansion | |
1946 // space, whichever is smaller, bounded below by a minimum | |
1947 // expansion (unless that's all that's left.) | |
342 | 1948 const size_t min_expand_bytes = 1*M; |
1949 size_t reserved_bytes = _g1->g1_reserved_obj_bytes(); | |
1950 size_t committed_bytes = _g1->capacity(); | |
1951 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
1952 size_t expand_bytes; | |
1953 size_t expand_bytes_via_pct = | |
751 | 1954 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
342 | 1955 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
1956 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
1957 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
1958 if (G1PolicyVerbose > 1) { | |
1959 gclog_or_tty->print("Decided to expand: ratio = %5.2f, " | |
1960 "committed = %d%s, uncommited = %d%s, via pct = %d%s.\n" | |
1961 " Answer = %d.\n", | |
1962 recent_avg_pause_time_ratio(), | |
1963 byte_size_in_proper_unit(committed_bytes), | |
1964 proper_unit_for_byte_size(committed_bytes), | |
1965 byte_size_in_proper_unit(uncommitted_bytes), | |
1966 proper_unit_for_byte_size(uncommitted_bytes), | |
1967 byte_size_in_proper_unit(expand_bytes_via_pct), | |
1968 proper_unit_for_byte_size(expand_bytes_via_pct), | |
1969 byte_size_in_proper_unit(expand_bytes), | |
1970 proper_unit_for_byte_size(expand_bytes)); | |
1971 } | |
1972 return expand_bytes; | |
1973 } else { | |
1974 return 0; | |
1975 } | |
1976 } | |
1977 | |
1978 void G1CollectorPolicy::note_start_of_mark_thread() { | |
1979 _mark_thread_startup_sec = os::elapsedTime(); | |
1980 } | |
1981 | |
1982 class CountCSClosure: public HeapRegionClosure { | |
1983 G1CollectorPolicy* _g1_policy; | |
1984 public: | |
1985 CountCSClosure(G1CollectorPolicy* g1_policy) : | |
1986 _g1_policy(g1_policy) {} | |
1987 bool doHeapRegion(HeapRegion* r) { | |
1988 _g1_policy->_bytes_in_collection_set_before_gc += r->used(); | |
1989 return false; | |
1990 } | |
1991 }; | |
1992 | |
1993 void G1CollectorPolicy::count_CS_bytes_used() { | |
1994 CountCSClosure cs_closure(this); | |
1995 _g1->collection_set_iterate(&cs_closure); | |
1996 } | |
1997 | |
1998 static void print_indent(int level) { | |
1999 for (int j = 0; j < level+1; ++j) | |
2000 gclog_or_tty->print(" "); | |
2001 } | |
2002 | |
2003 void G1CollectorPolicy::print_summary (int level, | |
2004 const char* str, | |
2005 NumberSeq* seq) const { | |
2006 double sum = seq->sum(); | |
2007 print_indent(level); | |
2008 gclog_or_tty->print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", | |
2009 str, sum / 1000.0, seq->avg()); | |
2010 } | |
2011 | |
2012 void G1CollectorPolicy::print_summary_sd (int level, | |
2013 const char* str, | |
2014 NumberSeq* seq) const { | |
2015 print_summary(level, str, seq); | |
2016 print_indent(level + 5); | |
2017 gclog_or_tty->print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", | |
2018 seq->num(), seq->sd(), seq->maximum()); | |
2019 } | |
2020 | |
2021 void G1CollectorPolicy::check_other_times(int level, | |
2022 NumberSeq* other_times_ms, | |
2023 NumberSeq* calc_other_times_ms) const { | |
2024 bool should_print = false; | |
2025 | |
2026 double max_sum = MAX2(fabs(other_times_ms->sum()), | |
2027 fabs(calc_other_times_ms->sum())); | |
2028 double min_sum = MIN2(fabs(other_times_ms->sum()), | |
2029 fabs(calc_other_times_ms->sum())); | |
2030 double sum_ratio = max_sum / min_sum; | |
2031 if (sum_ratio > 1.1) { | |
2032 should_print = true; | |
2033 print_indent(level + 1); | |
2034 gclog_or_tty->print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); | |
2035 } | |
2036 | |
2037 double max_avg = MAX2(fabs(other_times_ms->avg()), | |
2038 fabs(calc_other_times_ms->avg())); | |
2039 double min_avg = MIN2(fabs(other_times_ms->avg()), | |
2040 fabs(calc_other_times_ms->avg())); | |
2041 double avg_ratio = max_avg / min_avg; | |
2042 if (avg_ratio > 1.1) { | |
2043 should_print = true; | |
2044 print_indent(level + 1); | |
2045 gclog_or_tty->print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); | |
2046 } | |
2047 | |
2048 if (other_times_ms->sum() < -0.01) { | |
2049 print_indent(level + 1); | |
2050 gclog_or_tty->print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); | |
2051 } | |
2052 | |
2053 if (other_times_ms->avg() < -0.01) { | |
2054 print_indent(level + 1); | |
2055 gclog_or_tty->print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); | |
2056 } | |
2057 | |
2058 if (calc_other_times_ms->sum() < -0.01) { | |
2059 should_print = true; | |
2060 print_indent(level + 1); | |
2061 gclog_or_tty->print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); | |
2062 } | |
2063 | |
2064 if (calc_other_times_ms->avg() < -0.01) { | |
2065 should_print = true; | |
2066 print_indent(level + 1); | |
2067 gclog_or_tty->print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); | |
2068 } | |
2069 | |
2070 if (should_print) | |
2071 print_summary(level, "Other(Calc)", calc_other_times_ms); | |
2072 } | |
2073 | |
2074 void G1CollectorPolicy::print_summary(PauseSummary* summary) const { | |
2075 bool parallel = ParallelGCThreads > 0; | |
2076 MainBodySummary* body_summary = summary->main_body_summary(); | |
2077 if (summary->get_total_seq()->num() > 0) { | |
677 | 2078 print_summary_sd(0, "Evacuation Pauses", summary->get_total_seq()); |
342 | 2079 if (body_summary != NULL) { |
2080 print_summary(1, "SATB Drain", body_summary->get_satb_drain_seq()); | |
2081 if (parallel) { | |
2082 print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); | |
2083 print_summary(2, "Update RS", body_summary->get_update_rs_seq()); | |
2084 print_summary(2, "Ext Root Scanning", | |
2085 body_summary->get_ext_root_scan_seq()); | |
2086 print_summary(2, "Mark Stack Scanning", | |
2087 body_summary->get_mark_stack_scan_seq()); | |
2088 print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); | |
2089 print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); | |
2090 print_summary(2, "Termination", body_summary->get_termination_seq()); | |
2091 print_summary(2, "Other", body_summary->get_parallel_other_seq()); | |
2092 { | |
2093 NumberSeq* other_parts[] = { | |
2094 body_summary->get_update_rs_seq(), | |
2095 body_summary->get_ext_root_scan_seq(), | |
2096 body_summary->get_mark_stack_scan_seq(), | |
2097 body_summary->get_scan_rs_seq(), | |
2098 body_summary->get_obj_copy_seq(), | |
2099 body_summary->get_termination_seq() | |
2100 }; | |
2101 NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), | |
2102 7, other_parts); | |
2103 check_other_times(2, body_summary->get_parallel_other_seq(), | |
2104 &calc_other_times_ms); | |
2105 } | |
2106 print_summary(1, "Mark Closure", body_summary->get_mark_closure_seq()); | |
2107 print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); | |
2108 } else { | |
2109 print_summary(1, "Update RS", body_summary->get_update_rs_seq()); | |
2110 print_summary(1, "Ext Root Scanning", | |
2111 body_summary->get_ext_root_scan_seq()); | |
2112 print_summary(1, "Mark Stack Scanning", | |
2113 body_summary->get_mark_stack_scan_seq()); | |
2114 print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); | |
2115 print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); | |
2116 } | |
2117 } | |
2118 print_summary(1, "Other", summary->get_other_seq()); | |
2119 { | |
2120 NumberSeq calc_other_times_ms; | |
2121 if (body_summary != NULL) { | |
2122 // not abandoned | |
2123 if (parallel) { | |
2124 // parallel | |
2125 NumberSeq* other_parts[] = { | |
2126 body_summary->get_satb_drain_seq(), | |
2127 body_summary->get_parallel_seq(), | |
2128 body_summary->get_clear_ct_seq() | |
2129 }; | |
677 | 2130 calc_other_times_ms = NumberSeq(summary->get_total_seq(), |
2131 3, other_parts); | |
342 | 2132 } else { |
2133 // serial | |
2134 NumberSeq* other_parts[] = { | |
2135 body_summary->get_satb_drain_seq(), | |
2136 body_summary->get_update_rs_seq(), | |
2137 body_summary->get_ext_root_scan_seq(), | |
2138 body_summary->get_mark_stack_scan_seq(), | |
2139 body_summary->get_scan_rs_seq(), | |
2140 body_summary->get_obj_copy_seq() | |
2141 }; | |
2142 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
677 | 2143 7, other_parts); |
342 | 2144 } |
2145 } else { | |
2146 // abandoned | |
677 | 2147 calc_other_times_ms = NumberSeq(); |
342 | 2148 } |
2149 check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); | |
2150 } | |
2151 } else { | |
2152 print_indent(0); | |
2153 gclog_or_tty->print_cr("none"); | |
2154 } | |
2155 gclog_or_tty->print_cr(""); | |
2156 } | |
2157 | |
2158 void | |
677 | 2159 G1CollectorPolicy::print_abandoned_summary(PauseSummary* summary) const { |
342 | 2160 bool printed = false; |
677 | 2161 if (summary->get_total_seq()->num() > 0) { |
342 | 2162 printed = true; |
677 | 2163 print_summary(summary); |
342 | 2164 } |
2165 if (!printed) { | |
2166 print_indent(0); | |
2167 gclog_or_tty->print_cr("none"); | |
2168 gclog_or_tty->print_cr(""); | |
2169 } | |
2170 } | |
2171 | |
2172 void G1CollectorPolicy::print_tracing_info() const { | |
2173 if (TraceGen0Time) { | |
2174 gclog_or_tty->print_cr("ALL PAUSES"); | |
2175 print_summary_sd(0, "Total", _all_pause_times_ms); | |
2176 gclog_or_tty->print_cr(""); | |
2177 gclog_or_tty->print_cr(""); | |
2178 gclog_or_tty->print_cr(" Full Young GC Pauses: %8d", _full_young_pause_num); | |
2179 gclog_or_tty->print_cr(" Partial Young GC Pauses: %8d", _partial_young_pause_num); | |
2180 gclog_or_tty->print_cr(""); | |
2181 | |
677 | 2182 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
2183 print_summary(_summary); | |
342 | 2184 |
2185 gclog_or_tty->print_cr("ABANDONED PAUSES"); | |
677 | 2186 print_abandoned_summary(_abandoned_summary); |
342 | 2187 |
2188 gclog_or_tty->print_cr("MISC"); | |
2189 print_summary_sd(0, "Stop World", _all_stop_world_times_ms); | |
2190 print_summary_sd(0, "Yields", _all_yield_times_ms); | |
2191 for (int i = 0; i < _aux_num; ++i) { | |
2192 if (_all_aux_times_ms[i].num() > 0) { | |
2193 char buffer[96]; | |
2194 sprintf(buffer, "Aux%d", i); | |
2195 print_summary_sd(0, buffer, &_all_aux_times_ms[i]); | |
2196 } | |
2197 } | |
2198 | |
2199 size_t all_region_num = _region_num_young + _region_num_tenured; | |
2200 gclog_or_tty->print_cr(" New Regions %8d, Young %8d (%6.2lf%%), " | |
2201 "Tenured %8d (%6.2lf%%)", | |
2202 all_region_num, | |
2203 _region_num_young, | |
2204 (double) _region_num_young / (double) all_region_num * 100.0, | |
2205 _region_num_tenured, | |
2206 (double) _region_num_tenured / (double) all_region_num * 100.0); | |
2207 } | |
2208 if (TraceGen1Time) { | |
2209 if (_all_full_gc_times_ms->num() > 0) { | |
2210 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", | |
2211 _all_full_gc_times_ms->num(), | |
2212 _all_full_gc_times_ms->sum() / 1000.0); | |
2213 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); | |
2214 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", | |
2215 _all_full_gc_times_ms->sd(), | |
2216 _all_full_gc_times_ms->maximum()); | |
2217 } | |
2218 } | |
2219 } | |
2220 | |
2221 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
2222 #ifndef PRODUCT | |
2223 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
2224 // add this call for any other surv rate groups | |
2225 #endif // PRODUCT | |
2226 } | |
2227 | |
2228 bool | |
2229 G1CollectorPolicy::should_add_next_region_to_young_list() { | |
2230 assert(in_young_gc_mode(), "should be in young GC mode"); | |
2231 bool ret; | |
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2232 size_t young_list_length = _g1->young_list()->length(); |
545 | 2233 size_t young_list_max_length = _young_list_target_length; |
2234 if (G1FixedEdenSize) { | |
2235 young_list_max_length -= _max_survivor_regions; | |
2236 } | |
2237 if (young_list_length < young_list_max_length) { | |
342 | 2238 ret = true; |
2239 ++_region_num_young; | |
2240 } else { | |
2241 ret = false; | |
2242 ++_region_num_tenured; | |
2243 } | |
2244 | |
2245 return ret; | |
2246 } | |
2247 | |
2248 #ifndef PRODUCT | |
2249 // for debugging, bit of a hack... | |
2250 static char* | |
2251 region_num_to_mbs(int length) { | |
2252 static char buffer[64]; | |
2253 double bytes = (double) (length * HeapRegion::GrainBytes); | |
2254 double mbs = bytes / (double) (1024 * 1024); | |
2255 sprintf(buffer, "%7.2lfMB", mbs); | |
2256 return buffer; | |
2257 } | |
2258 #endif // PRODUCT | |
2259 | |
545 | 2260 size_t G1CollectorPolicy::max_regions(int purpose) { |
342 | 2261 switch (purpose) { |
2262 case GCAllocForSurvived: | |
545 | 2263 return _max_survivor_regions; |
342 | 2264 case GCAllocForTenured: |
545 | 2265 return REGIONS_UNLIMITED; |
342 | 2266 default: |
545 | 2267 ShouldNotReachHere(); |
2268 return REGIONS_UNLIMITED; | |
342 | 2269 }; |
2270 } | |
2271 | |
545 | 2272 // Calculates survivor space parameters. |
2273 void G1CollectorPolicy::calculate_survivors_policy() | |
2274 { | |
2275 if (G1FixedSurvivorSpaceSize == 0) { | |
2276 _max_survivor_regions = _young_list_target_length / SurvivorRatio; | |
2277 } else { | |
547
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2278 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
545 | 2279 } |
2280 | |
2281 if (G1FixedTenuringThreshold) { | |
2282 _tenuring_threshold = MaxTenuringThreshold; | |
2283 } else { | |
2284 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( | |
2285 HeapRegion::GrainWords * _max_survivor_regions); | |
2286 } | |
2287 } | |
2288 | |
342 | 2289 bool |
2290 G1CollectorPolicy_BestRegionsFirst::should_do_collection_pause(size_t | |
2291 word_size) { | |
2292 assert(_g1->regions_accounted_for(), "Region leakage!"); | |
2293 double max_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; | |
2294 | |
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2295 size_t young_list_length = _g1->young_list()->length(); |
545 | 2296 size_t young_list_max_length = _young_list_target_length; |
2297 if (G1FixedEdenSize) { | |
2298 young_list_max_length -= _max_survivor_regions; | |
2299 } | |
2300 bool reached_target_length = young_list_length >= young_list_max_length; | |
342 | 2301 |
2302 if (in_young_gc_mode()) { | |
2303 if (reached_target_length) { | |
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2304 assert( young_list_length > 0 && _g1->young_list()->length() > 0, |
342 | 2305 "invariant" ); |
2306 _target_pause_time_ms = max_pause_time_ms; | |
2307 return true; | |
2308 } | |
2309 } else { | |
2310 guarantee( false, "should not reach here" ); | |
2311 } | |
2312 | |
2313 return false; | |
2314 } | |
2315 | |
2316 #ifndef PRODUCT | |
2317 class HRSortIndexIsOKClosure: public HeapRegionClosure { | |
2318 CollectionSetChooser* _chooser; | |
2319 public: | |
2320 HRSortIndexIsOKClosure(CollectionSetChooser* chooser) : | |
2321 _chooser(chooser) {} | |
2322 | |
2323 bool doHeapRegion(HeapRegion* r) { | |
2324 if (!r->continuesHumongous()) { | |
2325 assert(_chooser->regionProperlyOrdered(r), "Ought to be."); | |
2326 } | |
2327 return false; | |
2328 } | |
2329 }; | |
2330 | |
2331 bool G1CollectorPolicy_BestRegionsFirst::assertMarkedBytesDataOK() { | |
2332 HRSortIndexIsOKClosure cl(_collectionSetChooser); | |
2333 _g1->heap_region_iterate(&cl); | |
2334 return true; | |
2335 } | |
2336 #endif | |
2337 | |
2338 void | |
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2339 G1CollectorPolicy::decide_on_conc_mark_initiation() { |
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2340 // We are about to decide on whether this pause will be an |
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2341 // initial-mark pause. |
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2342 |
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2343 // First, during_initial_mark_pause() should not be already set. We |
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2344 // will set it here if we have to. However, it should be cleared by |
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2345 // the end of the pause (it's only set for the duration of an |
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2346 // initial-mark pause). |
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2347 assert(!during_initial_mark_pause(), "pre-condition"); |
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2348 |
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2349 if (initiate_conc_mark_if_possible()) { |
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2350 // We had noticed on a previous pause that the heap occupancy has |
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2351 // gone over the initiating threshold and we should start a |
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2352 // concurrent marking cycle. So we might initiate one. |
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2353 |
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2354 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2355 if (!during_cycle) { |
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2356 // The concurrent marking thread is not "during a cycle", i.e., |
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2357 // it has completed the last one. So we can go ahead and |
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2358 // initiate a new cycle. |
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2359 |
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2360 set_during_initial_mark_pause(); |
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2361 |
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2362 // And we can now clear initiate_conc_mark_if_possible() as |
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2363 // we've already acted on it. |
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2364 clear_initiate_conc_mark_if_possible(); |
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2365 } else { |
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2366 // The concurrent marking thread is still finishing up the |
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2367 // previous cycle. If we start one right now the two cycles |
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2368 // overlap. In particular, the concurrent marking thread might |
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2369 // be in the process of clearing the next marking bitmap (which |
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2370 // we will use for the next cycle if we start one). Starting a |
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2371 // cycle now will be bad given that parts of the marking |
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2372 // information might get cleared by the marking thread. And we |
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2373 // cannot wait for the marking thread to finish the cycle as it |
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2374 // periodically yields while clearing the next marking bitmap |
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2375 // and, if it's in a yield point, it's waiting for us to |
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2376 // finish. So, at this point we will not start a cycle and we'll |
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2377 // let the concurrent marking thread complete the last one. |
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2378 } |
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2379 } |
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2380 } |
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2381 |
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2382 void |
342 | 2383 G1CollectorPolicy_BestRegionsFirst:: |
2384 record_collection_pause_start(double start_time_sec, size_t start_used) { | |
2385 G1CollectorPolicy::record_collection_pause_start(start_time_sec, start_used); | |
2386 } | |
2387 | |
2388 class NextNonCSElemFinder: public HeapRegionClosure { | |
2389 HeapRegion* _res; | |
2390 public: | |
2391 NextNonCSElemFinder(): _res(NULL) {} | |
2392 bool doHeapRegion(HeapRegion* r) { | |
2393 if (!r->in_collection_set()) { | |
2394 _res = r; | |
2395 return true; | |
2396 } else { | |
2397 return false; | |
2398 } | |
2399 } | |
2400 HeapRegion* res() { return _res; } | |
2401 }; | |
2402 | |
2403 class KnownGarbageClosure: public HeapRegionClosure { | |
2404 CollectionSetChooser* _hrSorted; | |
2405 | |
2406 public: | |
2407 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
2408 _hrSorted(hrSorted) | |
2409 {} | |
2410 | |
2411 bool doHeapRegion(HeapRegion* r) { | |
2412 // We only include humongous regions in collection | |
2413 // sets when concurrent mark shows that their contained object is | |
2414 // unreachable. | |
2415 | |
2416 // Do we have any marking information for this region? | |
2417 if (r->is_marked()) { | |
2418 // We don't include humongous regions in collection | |
2419 // sets because we collect them immediately at the end of a marking | |
2420 // cycle. We also don't include young regions because we *must* | |
2421 // include them in the next collection pause. | |
2422 if (!r->isHumongous() && !r->is_young()) { | |
2423 _hrSorted->addMarkedHeapRegion(r); | |
2424 } | |
2425 } | |
2426 return false; | |
2427 } | |
2428 }; | |
2429 | |
2430 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
2431 CollectionSetChooser* _hrSorted; | |
2432 jint _marked_regions_added; | |
2433 jint _chunk_size; | |
2434 jint _cur_chunk_idx; | |
2435 jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) | |
2436 int _worker; | |
2437 int _invokes; | |
2438 | |
2439 void get_new_chunk() { | |
2440 _cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size); | |
2441 _cur_chunk_end = _cur_chunk_idx + _chunk_size; | |
2442 } | |
2443 void add_region(HeapRegion* r) { | |
2444 if (_cur_chunk_idx == _cur_chunk_end) { | |
2445 get_new_chunk(); | |
2446 } | |
2447 assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); | |
2448 _hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r); | |
2449 _marked_regions_added++; | |
2450 _cur_chunk_idx++; | |
2451 } | |
2452 | |
2453 public: | |
2454 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
2455 jint chunk_size, | |
2456 int worker) : | |
2457 _hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker), | |
2458 _marked_regions_added(0), _cur_chunk_idx(0), _cur_chunk_end(0), | |
2459 _invokes(0) | |
2460 {} | |
2461 | |
2462 bool doHeapRegion(HeapRegion* r) { | |
2463 // We only include humongous regions in collection | |
2464 // sets when concurrent mark shows that their contained object is | |
2465 // unreachable. | |
2466 _invokes++; | |
2467 | |
2468 // Do we have any marking information for this region? | |
2469 if (r->is_marked()) { | |
2470 // We don't include humongous regions in collection | |
2471 // sets because we collect them immediately at the end of a marking | |
2472 // cycle. | |
2473 // We also do not include young regions in collection sets | |
2474 if (!r->isHumongous() && !r->is_young()) { | |
2475 add_region(r); | |
2476 } | |
2477 } | |
2478 return false; | |
2479 } | |
2480 jint marked_regions_added() { return _marked_regions_added; } | |
2481 int invokes() { return _invokes; } | |
2482 }; | |
2483 | |
2484 class ParKnownGarbageTask: public AbstractGangTask { | |
2485 CollectionSetChooser* _hrSorted; | |
2486 jint _chunk_size; | |
2487 G1CollectedHeap* _g1; | |
2488 public: | |
2489 ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) : | |
2490 AbstractGangTask("ParKnownGarbageTask"), | |
2491 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
2492 _g1(G1CollectedHeap::heap()) | |
2493 {} | |
2494 | |
2495 void work(int i) { | |
2496 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size, i); | |
2497 // Back to zero for the claim value. | |
355 | 2498 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, i, |
2499 HeapRegion::InitialClaimValue); | |
342 | 2500 jint regions_added = parKnownGarbageCl.marked_regions_added(); |
2501 _hrSorted->incNumMarkedHeapRegions(regions_added); | |
2502 if (G1PrintParCleanupStats) { | |
2503 gclog_or_tty->print(" Thread %d called %d times, added %d regions to list.\n", | |
2504 i, parKnownGarbageCl.invokes(), regions_added); | |
2505 } | |
2506 } | |
2507 }; | |
2508 | |
2509 void | |
2510 G1CollectorPolicy_BestRegionsFirst:: | |
2511 record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
2512 size_t max_live_bytes) { | |
2513 double start; | |
2514 if (G1PrintParCleanupStats) start = os::elapsedTime(); | |
2515 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
2516 | |
2517 _collectionSetChooser->clearMarkedHeapRegions(); | |
2518 double clear_marked_end; | |
2519 if (G1PrintParCleanupStats) { | |
2520 clear_marked_end = os::elapsedTime(); | |
2521 gclog_or_tty->print_cr(" clear marked regions + work1: %8.3f ms.", | |
2522 (clear_marked_end - start)*1000.0); | |
2523 } | |
2524 if (ParallelGCThreads > 0) { | |
2525 const size_t OverpartitionFactor = 4; | |
2526 const size_t MinChunkSize = 8; | |
2527 const size_t ChunkSize = | |
2528 MAX2(_g1->n_regions() / (ParallelGCThreads * OverpartitionFactor), | |
2529 MinChunkSize); | |
2530 _collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(), | |
2531 ChunkSize); | |
2532 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, | |
2533 (int) ChunkSize); | |
2534 _g1->workers()->run_task(&parKnownGarbageTask); | |
355 | 2535 |
2536 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2537 "sanity check"); | |
342 | 2538 } else { |
2539 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
2540 _g1->heap_region_iterate(&knownGarbagecl); | |
2541 } | |
2542 double known_garbage_end; | |
2543 if (G1PrintParCleanupStats) { | |
2544 known_garbage_end = os::elapsedTime(); | |
2545 gclog_or_tty->print_cr(" compute known garbage: %8.3f ms.", | |
2546 (known_garbage_end - clear_marked_end)*1000.0); | |
2547 } | |
2548 _collectionSetChooser->sortMarkedHeapRegions(); | |
2549 double sort_end; | |
2550 if (G1PrintParCleanupStats) { | |
2551 sort_end = os::elapsedTime(); | |
2552 gclog_or_tty->print_cr(" sorting: %8.3f ms.", | |
2553 (sort_end - known_garbage_end)*1000.0); | |
2554 } | |
2555 | |
2556 record_concurrent_mark_cleanup_end_work2(); | |
2557 double work2_end; | |
2558 if (G1PrintParCleanupStats) { | |
2559 work2_end = os::elapsedTime(); | |
2560 gclog_or_tty->print_cr(" work2: %8.3f ms.", | |
2561 (work2_end - sort_end)*1000.0); | |
2562 } | |
2563 } | |
2564 | |
1394
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2565 // Add the heap region at the head of the non-incremental collection set |
342 | 2566 void G1CollectorPolicy:: |
2567 add_to_collection_set(HeapRegion* hr) { | |
1394
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2568 assert(_inc_cset_build_state == Active, "Precondition"); |
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2569 assert(!hr->is_young(), "non-incremental add of young region"); |
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2570 |
1282 | 2571 if (G1PrintHeapRegions) { |
1388 | 2572 gclog_or_tty->print_cr("added region to cset " |
2573 "%d:["PTR_FORMAT", "PTR_FORMAT"], " | |
2574 "top "PTR_FORMAT", %s", | |
2575 hr->hrs_index(), hr->bottom(), hr->end(), | |
2576 hr->top(), hr->is_young() ? "YOUNG" : "NOT_YOUNG"); | |
342 | 2577 } |
2578 | |
2579 if (_g1->mark_in_progress()) | |
2580 _g1->concurrent_mark()->registerCSetRegion(hr); | |
2581 | |
1394
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2582 assert(!hr->in_collection_set(), "should not already be in the CSet"); |
342 | 2583 hr->set_in_collection_set(true); |
2584 hr->set_next_in_collection_set(_collection_set); | |
2585 _collection_set = hr; | |
2586 _collection_set_size++; | |
2587 _collection_set_bytes_used_before += hr->used(); | |
526 | 2588 _g1->register_region_with_in_cset_fast_test(hr); |
342 | 2589 } |
2590 | |
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2591 // Initialize the per-collection-set information |
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2592 void G1CollectorPolicy::start_incremental_cset_building() { |
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2593 assert(_inc_cset_build_state == Inactive, "Precondition"); |
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2594 |
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2595 _inc_cset_head = NULL; |
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2596 _inc_cset_tail = NULL; |
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2597 _inc_cset_size = 0; |
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2598 _inc_cset_bytes_used_before = 0; |
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2599 |
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2600 if (in_young_gc_mode()) { |
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2601 _inc_cset_young_index = 0; |
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2602 } |
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2603 |
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2604 _inc_cset_max_finger = 0; |
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2605 _inc_cset_recorded_young_bytes = 0; |
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2606 _inc_cset_recorded_rs_lengths = 0; |
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2607 _inc_cset_predicted_elapsed_time_ms = 0; |
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2608 _inc_cset_predicted_bytes_to_copy = 0; |
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2609 _inc_cset_build_state = Active; |
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2610 } |
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2611 |
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2612 void G1CollectorPolicy::add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length) { |
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2613 // This routine is used when: |
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2614 // * adding survivor regions to the incremental cset at the end of an |
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2615 // evacuation pause, |
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2616 // * adding the current allocation region to the incremental cset |
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2617 // when it is retired, and |
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2618 // * updating existing policy information for a region in the |
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2619 // incremental cset via young list RSet sampling. |
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2620 // Therefore this routine may be called at a safepoint by the |
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2621 // VM thread, or in-between safepoints by mutator threads (when |
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2622 // retiring the current allocation region) or a concurrent |
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2623 // refine thread (RSet sampling). |
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2624 |
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2625 double region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, true); |
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2626 size_t used_bytes = hr->used(); |
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2627 |
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2628 _inc_cset_recorded_rs_lengths += rs_length; |
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2629 _inc_cset_predicted_elapsed_time_ms += region_elapsed_time_ms; |
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2630 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2631 _inc_cset_bytes_used_before += used_bytes; |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2632 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2633 // Cache the values we have added to the aggregated informtion |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2634 // in the heap region in case we have to remove this region from |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2635 // the incremental collection set, or it is updated by the |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2636 // rset sampling code |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2637 hr->set_recorded_rs_length(rs_length); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2638 hr->set_predicted_elapsed_time_ms(region_elapsed_time_ms); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
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|
2639 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2640 #if PREDICTIONS_VERBOSE |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2641 size_t bytes_to_copy = predict_bytes_to_copy(hr); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2642 _inc_cset_predicted_bytes_to_copy += bytes_to_copy; |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2643 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2644 // Record the number of bytes used in this region |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2645 _inc_cset_recorded_young_bytes += used_bytes; |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2646 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2647 // Cache the values we have added to the aggregated informtion |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2648 // in the heap region in case we have to remove this region from |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2649 // the incremental collection set, or it is updated by the |
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diff
changeset
|
2650 // rset sampling code |
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diff
changeset
|
2651 hr->set_predicted_bytes_to_copy(bytes_to_copy); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2652 #endif // PREDICTIONS_VERBOSE |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2653 } |
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diff
changeset
|
2654 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2655 void G1CollectorPolicy::remove_from_incremental_cset_info(HeapRegion* hr) { |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2656 // This routine is currently only called as part of the updating of |
1316cec51b4d
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|
2657 // existing policy information for regions in the incremental cset that |
1316cec51b4d
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changeset
|
2658 // is performed by the concurrent refine thread(s) as part of young list |
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changeset
|
2659 // RSet sampling. Therefore we should not be at a safepoint. |
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diff
changeset
|
2660 |
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diff
changeset
|
2661 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); |
1316cec51b4d
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|
2662 assert(hr->is_young(), "it should be"); |
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diff
changeset
|
2663 |
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diff
changeset
|
2664 size_t used_bytes = hr->used(); |
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changeset
|
2665 size_t old_rs_length = hr->recorded_rs_length(); |
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changeset
|
2666 double old_elapsed_time_ms = hr->predicted_elapsed_time_ms(); |
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parents:
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diff
changeset
|
2667 |
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diff
changeset
|
2668 // Subtract the old recorded/predicted policy information for |
1316cec51b4d
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parents:
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diff
changeset
|
2669 // the given heap region from the collection set info. |
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parents:
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changeset
|
2670 _inc_cset_recorded_rs_lengths -= old_rs_length; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2671 _inc_cset_predicted_elapsed_time_ms -= old_elapsed_time_ms; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2672 |
1316cec51b4d
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parents:
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diff
changeset
|
2673 _inc_cset_bytes_used_before -= used_bytes; |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2674 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2675 // Clear the values cached in the heap region |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2676 hr->set_recorded_rs_length(0); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2677 hr->set_predicted_elapsed_time_ms(0); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2678 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2679 #if PREDICTIONS_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2680 size_t old_predicted_bytes_to_copy = hr->predicted_bytes_to_copy(); |
1316cec51b4d
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parents:
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diff
changeset
|
2681 _inc_cset_predicted_bytes_to_copy -= old_predicted_bytes_to_copy; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2682 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2683 // Subtract the number of bytes used in this region |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2684 _inc_cset_recorded_young_bytes -= used_bytes; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2685 |
1316cec51b4d
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parents:
1391
diff
changeset
|
2686 // Clear the values cached in the heap region |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2687 hr->set_predicted_bytes_to_copy(0); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2688 #endif // PREDICTIONS_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2689 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2690 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2691 void G1CollectorPolicy::update_incremental_cset_info(HeapRegion* hr, size_t new_rs_length) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2692 // Update the collection set information that is dependent on the new RS length |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2693 assert(hr->is_young(), "Precondition"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2694 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2695 remove_from_incremental_cset_info(hr); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2696 add_to_incremental_cset_info(hr, new_rs_length); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2697 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2698 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2699 void G1CollectorPolicy::add_region_to_incremental_cset_common(HeapRegion* hr) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2700 assert( hr->is_young(), "invariant"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2701 assert( hr->young_index_in_cset() == -1, "invariant" ); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2702 assert(_inc_cset_build_state == Active, "Precondition"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2703 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2704 // We need to clear and set the cached recorded/cached collection set |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2705 // information in the heap region here (before the region gets added |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2706 // to the collection set). An individual heap region's cached values |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2707 // are calculated, aggregated with the policy collection set info, |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2708 // and cached in the heap region here (initially) and (subsequently) |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2709 // by the Young List sampling code. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2710 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2711 size_t rs_length = hr->rem_set()->occupied(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2712 add_to_incremental_cset_info(hr, rs_length); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2713 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2714 HeapWord* hr_end = hr->end(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2715 _inc_cset_max_finger = MAX2(_inc_cset_max_finger, hr_end); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2716 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2717 assert(!hr->in_collection_set(), "invariant"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2718 hr->set_in_collection_set(true); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2719 assert( hr->next_in_collection_set() == NULL, "invariant"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2720 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2721 _inc_cset_size++; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2722 _g1->register_region_with_in_cset_fast_test(hr); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2723 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2724 hr->set_young_index_in_cset((int) _inc_cset_young_index); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2725 ++_inc_cset_young_index; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2726 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2727 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2728 // Add the region at the RHS of the incremental cset |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2729 void G1CollectorPolicy::add_region_to_incremental_cset_rhs(HeapRegion* hr) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2730 // We should only ever be appending survivors at the end of a pause |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2731 assert( hr->is_survivor(), "Logic"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2732 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2733 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2734 add_region_to_incremental_cset_common(hr); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2735 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2736 // Now add the region at the right hand side |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2737 if (_inc_cset_tail == NULL) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2738 assert(_inc_cset_head == NULL, "invariant"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2739 _inc_cset_head = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2740 } else { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2741 _inc_cset_tail->set_next_in_collection_set(hr); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2742 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2743 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2744 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2745 if (G1PrintHeapRegions) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2746 gclog_or_tty->print_cr(" added region to incremental cset (RHS) " |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2747 "%d:["PTR_FORMAT", "PTR_FORMAT"], " |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2748 "top "PTR_FORMAT", young %s", |
1316cec51b4d
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2749 hr->hrs_index(), hr->bottom(), hr->end(), |
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2750 hr->top(), (hr->is_young()) ? "YES" : "NO"); |
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|
2751 } |
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|
2752 } |
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|
2753 |
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|
2754 // Add the region to the LHS of the incremental cset |
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2755 void G1CollectorPolicy::add_region_to_incremental_cset_lhs(HeapRegion* hr) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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2756 // Survivors should be added to the RHS at the end of a pause |
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2757 assert(!hr->is_survivor(), "Logic"); |
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|
2758 |
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|
2759 // Do the 'common' stuff |
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|
2760 add_region_to_incremental_cset_common(hr); |
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|
2761 |
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|
2762 // Add the region at the left hand side |
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2763 hr->set_next_in_collection_set(_inc_cset_head); |
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2764 if (_inc_cset_head == NULL) { |
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2765 assert(_inc_cset_tail == NULL, "Invariant"); |
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2766 _inc_cset_tail = hr; |
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|
2767 } |
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|
2768 _inc_cset_head = hr; |
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2769 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2770 if (G1PrintHeapRegions) { |
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2771 gclog_or_tty->print_cr(" added region to incremental cset (LHS) " |
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2772 "%d:["PTR_FORMAT", "PTR_FORMAT"], " |
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|
2773 "top "PTR_FORMAT", young %s", |
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2774 hr->hrs_index(), hr->bottom(), hr->end(), |
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|
2775 hr->top(), (hr->is_young()) ? "YES" : "NO"); |
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|
2776 } |
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|
2777 } |
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|
2778 |
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|
2779 #ifndef PRODUCT |
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2780 void G1CollectorPolicy::print_collection_set(HeapRegion* list_head, outputStream* st) { |
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2781 assert(list_head == inc_cset_head() || list_head == collection_set(), "must be"); |
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|
2782 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2783 st->print_cr("\nCollection_set:"); |
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2784 HeapRegion* csr = list_head; |
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2785 while (csr != NULL) { |
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|
2786 HeapRegion* next = csr->next_in_collection_set(); |
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|
2787 assert(csr->in_collection_set(), "bad CS"); |
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2788 st->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " |
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|
2789 "age: %4d, y: %d, surv: %d", |
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|
2790 csr->bottom(), csr->end(), |
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|
2791 csr->top(), |
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|
2792 csr->prev_top_at_mark_start(), |
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|
2793 csr->next_top_at_mark_start(), |
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|
2794 csr->top_at_conc_mark_count(), |
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|
2795 csr->age_in_surv_rate_group_cond(), |
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|
2796 csr->is_young(), |
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|
2797 csr->is_survivor()); |
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|
2798 csr = next; |
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|
2799 } |
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|
2800 } |
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|
2801 #endif // !PRODUCT |
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|
2802 |
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|
2803 bool |
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|
2804 G1CollectorPolicy_BestRegionsFirst::choose_collection_set() { |
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|
2805 // Set this here - in case we're not doing young collections. |
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|
2806 double non_young_start_time_sec = os::elapsedTime(); |
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|
2807 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2808 // The result that this routine will return. This will be set to |
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|
2809 // false if: |
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|
2810 // * we're doing a young or partially young collection and we |
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|
2811 // have added the youg regions to collection set, or |
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|
2812 // * we add old regions to the collection set. |
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|
2813 bool abandon_collection = true; |
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|
2814 |
342 | 2815 start_recording_regions(); |
2816 | |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1087
diff
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|
2817 guarantee(_target_pause_time_ms > -1.0 |
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1087
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|
2818 NOT_PRODUCT(|| Universe::heap()->gc_cause() == GCCause::_scavenge_alot), |
677 | 2819 "_target_pause_time_ms should have been set!"); |
1088
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6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1087
diff
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|
2820 #ifndef PRODUCT |
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1087
diff
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|
2821 if (_target_pause_time_ms <= -1.0) { |
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1087
diff
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|
2822 assert(ScavengeALot && Universe::heap()->gc_cause() == GCCause::_scavenge_alot, "Error"); |
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
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diff
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|
2823 _target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1087
diff
changeset
|
2824 } |
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6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1087
diff
changeset
|
2825 #endif |
677 | 2826 assert(_collection_set == NULL, "Precondition"); |
342 | 2827 |
2828 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
2829 double predicted_pause_time_ms = base_time_ms; | |
2830 | |
2831 double target_time_ms = _target_pause_time_ms; | |
2832 double time_remaining_ms = target_time_ms - base_time_ms; | |
2833 | |
2834 // the 10% and 50% values are arbitrary... | |
2835 if (time_remaining_ms < 0.10*target_time_ms) { | |
2836 time_remaining_ms = 0.50 * target_time_ms; | |
2837 _within_target = false; | |
2838 } else { | |
2839 _within_target = true; | |
2840 } | |
2841 | |
2842 // We figure out the number of bytes available for future to-space. | |
2843 // For new regions without marking information, we must assume the | |
2844 // worst-case of complete survival. If we have marking information for a | |
2845 // region, we can bound the amount of live data. We can add a number of | |
2846 // such regions, as long as the sum of the live data bounds does not | |
2847 // exceed the available evacuation space. | |
2848 size_t max_live_bytes = _g1->free_regions() * HeapRegion::GrainBytes; | |
2849 | |
2850 size_t expansion_bytes = | |
2851 _g1->expansion_regions() * HeapRegion::GrainBytes; | |
2852 | |
677 | 2853 _collection_set_bytes_used_before = 0; |
2854 _collection_set_size = 0; | |
342 | 2855 |
2856 // Adjust for expansion and slop. | |
2857 max_live_bytes = max_live_bytes + expansion_bytes; | |
2858 | |
677 | 2859 assert(_g1->regions_accounted_for(), "Region leakage!"); |
342 | 2860 |
2861 HeapRegion* hr; | |
2862 if (in_young_gc_mode()) { | |
2863 double young_start_time_sec = os::elapsedTime(); | |
2864 | |
2865 if (G1PolicyVerbose > 0) { | |
2866 gclog_or_tty->print_cr("Adding %d young regions to the CSet", | |
1394
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|
2867 _g1->young_list()->length()); |
342 | 2868 } |
1394
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parents:
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|
2869 |
342 | 2870 _young_cset_length = 0; |
2871 _last_young_gc_full = full_young_gcs() ? true : false; | |
1394
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|
2872 |
342 | 2873 if (_last_young_gc_full) |
2874 ++_full_young_pause_num; | |
2875 else | |
2876 ++_partial_young_pause_num; | |
1394
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|
2877 |
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diff
changeset
|
2878 // The young list is laid with the survivor regions from the previous |
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diff
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|
2879 // pause are appended to the RHS of the young list, i.e. |
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diff
changeset
|
2880 // [Newly Young Regions ++ Survivors from last pause]. |
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diff
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|
2881 |
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diff
changeset
|
2882 hr = _g1->young_list()->first_survivor_region(); |
342 | 2883 while (hr != NULL) { |
1394
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diff
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|
2884 assert(hr->is_survivor(), "badly formed young list"); |
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diff
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|
2885 hr->set_young(); |
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diff
changeset
|
2886 hr = hr->get_next_young_region(); |
342 | 2887 } |
2888 | |
1394
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diff
changeset
|
2889 // Clear the fields that point to the survivor list - they are |
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diff
changeset
|
2890 // all young now. |
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diff
changeset
|
2891 _g1->young_list()->clear_survivors(); |
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diff
changeset
|
2892 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2893 if (_g1->mark_in_progress()) |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2894 _g1->concurrent_mark()->register_collection_set_finger(_inc_cset_max_finger); |
1316cec51b4d
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diff
changeset
|
2895 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2896 _young_cset_length = _inc_cset_young_index; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
2897 _collection_set = _inc_cset_head; |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2898 _collection_set_size = _inc_cset_size; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2899 _collection_set_bytes_used_before = _inc_cset_bytes_used_before; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2900 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2901 // For young regions in the collection set, we assume the worst |
1316cec51b4d
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parents:
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diff
changeset
|
2902 // case of complete survival |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2903 max_live_bytes -= _inc_cset_size * HeapRegion::GrainBytes; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2904 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2905 time_remaining_ms -= _inc_cset_predicted_elapsed_time_ms; |
1316cec51b4d
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parents:
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diff
changeset
|
2906 predicted_pause_time_ms += _inc_cset_predicted_elapsed_time_ms; |
1316cec51b4d
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parents:
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diff
changeset
|
2907 |
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2908 // The number of recorded young regions is the incremental |
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2909 // collection set's current size |
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2910 set_recorded_young_regions(_inc_cset_size); |
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2911 set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths); |
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2912 set_recorded_young_bytes(_inc_cset_recorded_young_bytes); |
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2913 #if PREDICTIONS_VERBOSE |
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2914 set_predicted_bytes_to_copy(_inc_cset_predicted_bytes_to_copy); |
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2915 #endif // PREDICTIONS_VERBOSE |
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2916 |
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2917 if (G1PolicyVerbose > 0) { |
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2918 gclog_or_tty->print_cr(" Added " PTR_FORMAT " Young Regions to CS.", |
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2919 _inc_cset_size); |
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2920 gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", |
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2921 max_live_bytes/K); |
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2922 } |
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2923 |
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2924 assert(_inc_cset_size == _g1->young_list()->length(), "Invariant"); |
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2925 if (_inc_cset_size > 0) { |
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2926 assert(_collection_set != NULL, "Invariant"); |
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2927 abandon_collection = false; |
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2928 } |
342 | 2929 |
2930 double young_end_time_sec = os::elapsedTime(); | |
2931 _recorded_young_cset_choice_time_ms = | |
2932 (young_end_time_sec - young_start_time_sec) * 1000.0; | |
2933 | |
1394
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2934 // We are doing young collections so reset this. |
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2935 non_young_start_time_sec = young_end_time_sec; |
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2936 |
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2937 // Note we can use either _collection_set_size or |
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2938 // _young_cset_length here |
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2939 if (_collection_set_size > 0 && _last_young_gc_full) { |
342 | 2940 // don't bother adding more regions... |
2941 goto choose_collection_set_end; | |
2942 } | |
2943 } | |
2944 | |
2945 if (!in_young_gc_mode() || !full_young_gcs()) { | |
2946 bool should_continue = true; | |
2947 NumberSeq seq; | |
2948 double avg_prediction = 100000000000000000.0; // something very large | |
1394
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2949 |
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2950 // Save the current size of the collection set to detect |
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2951 // if we actually added any old regions. |
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2952 size_t n_young_regions = _collection_set_size; |
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2953 |
342 | 2954 do { |
2955 hr = _collectionSetChooser->getNextMarkedRegion(time_remaining_ms, | |
2956 avg_prediction); | |
677 | 2957 if (hr != NULL) { |
342 | 2958 double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
2959 time_remaining_ms -= predicted_time_ms; | |
2960 predicted_pause_time_ms += predicted_time_ms; | |
2961 add_to_collection_set(hr); | |
1394
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2962 record_non_young_cset_region(hr); |
342 | 2963 max_live_bytes -= MIN2(hr->max_live_bytes(), max_live_bytes); |
2964 if (G1PolicyVerbose > 0) { | |
2965 gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", | |
2966 max_live_bytes/K); | |
2967 } | |
2968 seq.add(predicted_time_ms); | |
2969 avg_prediction = seq.avg() + seq.sd(); | |
2970 } | |
2971 should_continue = | |
2972 ( hr != NULL) && | |
2973 ( (adaptive_young_list_length()) ? time_remaining_ms > 0.0 | |
2974 : _collection_set_size < _young_list_fixed_length ); | |
2975 } while (should_continue); | |
2976 | |
2977 if (!adaptive_young_list_length() && | |
2978 _collection_set_size < _young_list_fixed_length) | |
2979 _should_revert_to_full_young_gcs = true; | |
1394
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2980 |
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2981 if (_collection_set_size > n_young_regions) { |
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2982 // We actually added old regions to the collection set |
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2983 // so we are not abandoning this collection. |
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2984 abandon_collection = false; |
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2985 } |
342 | 2986 } |
2987 | |
2988 choose_collection_set_end: | |
1394
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2989 stop_incremental_cset_building(); |
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2990 |
342 | 2991 count_CS_bytes_used(); |
2992 | |
2993 end_recording_regions(); | |
2994 | |
2995 double non_young_end_time_sec = os::elapsedTime(); | |
2996 _recorded_non_young_cset_choice_time_ms = | |
2997 (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; | |
1394
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2998 |
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2999 return abandon_collection; |
342 | 3000 } |
3001 | |
3002 void G1CollectorPolicy_BestRegionsFirst::record_full_collection_end() { | |
3003 G1CollectorPolicy::record_full_collection_end(); | |
3004 _collectionSetChooser->updateAfterFullCollection(); | |
3005 } | |
3006 | |
3007 void G1CollectorPolicy_BestRegionsFirst:: | |
3008 expand_if_possible(size_t numRegions) { | |
3009 size_t expansion_bytes = numRegions * HeapRegion::GrainBytes; | |
3010 _g1->expand(expansion_bytes); | |
3011 } | |
3012 | |
3013 void G1CollectorPolicy_BestRegionsFirst:: | |
677 | 3014 record_collection_pause_end(bool abandoned) { |
3015 G1CollectorPolicy::record_collection_pause_end(abandoned); | |
342 | 3016 assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end."); |
3017 } |