Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 1656:4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
Summary: G1 was not handling explicit GCs correctly in many ways. It does now. See the CR for the list of improvements contained in this changeset.
Reviewed-by: iveresov, ysr, johnc
author | tonyp |
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date | Mon, 28 Jun 2010 14:13:17 -0400 |
parents | 215576b54709 |
children | 2d160770d2e5 |
rev | line source |
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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 | |
158 _recent_prev_end_times_for_all_gcs_sec(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
159 | |
160 _recent_CS_bytes_used_before(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
161 _recent_CS_bytes_surviving(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
162 | |
163 _recent_avg_pause_time_ratio(0.0), | |
164 _num_markings(0), | |
165 _n_marks(0), | |
166 _n_pauses_at_mark_end(0), | |
167 | |
168 _all_full_gc_times_ms(new NumberSeq()), | |
169 | |
170 // G1PausesBtwnConcMark defaults to -1 | |
171 // so the hack is to do the cast QQQ FIXME | |
172 _pauses_btwn_concurrent_mark((size_t)G1PausesBtwnConcMark), | |
173 _n_marks_since_last_pause(0), | |
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174 _initiate_conc_mark_if_possible(false), |
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175 _during_initial_mark_pause(false), |
342 | 176 _should_revert_to_full_young_gcs(false), |
177 _last_full_young_gc(false), | |
178 | |
179 _prev_collection_pause_used_at_end_bytes(0), | |
180 | |
181 _collection_set(NULL), | |
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182 _collection_set_size(0), |
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183 _collection_set_bytes_used_before(0), |
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184 |
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185 // Incremental CSet attributes |
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186 _inc_cset_build_state(Inactive), |
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187 _inc_cset_head(NULL), |
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188 _inc_cset_tail(NULL), |
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189 _inc_cset_size(0), |
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190 _inc_cset_young_index(0), |
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191 _inc_cset_bytes_used_before(0), |
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192 _inc_cset_max_finger(NULL), |
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193 _inc_cset_recorded_young_bytes(0), |
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194 _inc_cset_recorded_rs_lengths(0), |
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195 _inc_cset_predicted_elapsed_time_ms(0.0), |
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196 _inc_cset_predicted_bytes_to_copy(0), |
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197 |
342 | 198 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
199 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
200 #endif // _MSC_VER | |
201 | |
202 _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", | |
203 G1YoungSurvRateNumRegionsSummary)), | |
204 _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", | |
545 | 205 G1YoungSurvRateNumRegionsSummary)), |
342 | 206 // add here any more surv rate groups |
545 | 207 _recorded_survivor_regions(0), |
208 _recorded_survivor_head(NULL), | |
209 _recorded_survivor_tail(NULL), | |
1356 | 210 _survivors_age_table(true), |
211 | |
212 _gc_overhead_perc(0.0) | |
545 | 213 |
342 | 214 { |
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215 // Set up the region size and associated fields. Given that the |
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216 // policy is created before the heap, we have to set this up here, |
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217 // so it's done as soon as possible. |
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218 HeapRegion::setup_heap_region_size(Arguments::min_heap_size()); |
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219 HeapRegionRemSet::setup_remset_size(); |
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220 |
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221 // Verify PLAB sizes |
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222 const uint region_size = HeapRegion::GrainWords; |
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223 if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
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224 char buffer[128]; |
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225 jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most %u", |
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226 OldPLABSize > region_size ? "Old" : "Young", region_size); |
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227 vm_exit_during_initialization(buffer); |
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228 } |
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229 |
342 | 230 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
231 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
232 | |
1611 | 233 _par_last_gc_worker_start_times_ms = new double[_parallel_gc_threads]; |
342 | 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_times_ms = new double[_parallel_gc_threads]; | |
238 _par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; | |
239 | |
240 _par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; | |
241 _par_last_scan_new_refs_times_ms = new double[_parallel_gc_threads]; | |
242 | |
243 _par_last_obj_copy_times_ms = new double[_parallel_gc_threads]; | |
244 | |
245 _par_last_termination_times_ms = new double[_parallel_gc_threads]; | |
1611 | 246 _par_last_termination_attempts = new double[_parallel_gc_threads]; |
247 _par_last_gc_worker_end_times_ms = new double[_parallel_gc_threads]; | |
342 | 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 | |
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277 // Below, we might need to calculate the pause time target based on |
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278 // the pause interval. When we do so we are going to give G1 maximum |
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279 // flexibility and allow it to do pauses when it needs to. So, we'll |
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280 // arrange that the pause interval to be pause time target + 1 to |
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281 // ensure that a) the pause time target is maximized with respect to |
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282 // the pause interval and b) we maintain the invariant that pause |
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283 // time target < pause interval. If the user does not want this |
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284 // maximum flexibility, they will have to set the pause interval |
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285 // explicitly. |
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286 |
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287 // First make sure that, if either parameter is set, its value is |
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288 // reasonable. |
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289 if (!FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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290 if (MaxGCPauseMillis < 1) { |
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291 vm_exit_during_initialization("MaxGCPauseMillis should be " |
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292 "greater than 0"); |
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293 } |
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294 } |
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295 if (!FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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296 if (GCPauseIntervalMillis < 1) { |
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297 vm_exit_during_initialization("GCPauseIntervalMillis should be " |
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298 "greater than 0"); |
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299 } |
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300 } |
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301 |
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302 // Then, if the pause time target parameter was not set, set it to |
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303 // the default value. |
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304 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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305 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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306 // The default pause time target in G1 is 200ms |
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307 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); |
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308 } else { |
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309 // We do not allow the pause interval to be set without the |
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310 // pause time target |
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311 vm_exit_during_initialization("GCPauseIntervalMillis cannot be set " |
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312 "without setting MaxGCPauseMillis"); |
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313 } |
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314 } |
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315 |
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316 // Then, if the interval parameter was not set, set it according to |
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317 // the pause time target (this will also deal with the case when the |
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318 // pause time target is the default value). |
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319 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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320 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); |
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321 } |
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322 |
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323 // Finally, make sure that the two parameters are consistent. |
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324 if (MaxGCPauseMillis >= GCPauseIntervalMillis) { |
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325 char buffer[256]; |
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326 jio_snprintf(buffer, 256, |
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327 "MaxGCPauseMillis (%u) should be less than " |
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328 "GCPauseIntervalMillis (%u)", |
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329 MaxGCPauseMillis, GCPauseIntervalMillis); |
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330 vm_exit_during_initialization(buffer); |
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331 } |
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332 |
751 | 333 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; |
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334 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
342 | 335 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); |
751 | 336 _sigma = (double) G1ConfidencePercent / 100.0; |
342 | 337 |
338 // start conservatively (around 50ms is about right) | |
339 _concurrent_mark_init_times_ms->add(0.05); | |
340 _concurrent_mark_remark_times_ms->add(0.05); | |
341 _concurrent_mark_cleanup_times_ms->add(0.20); | |
342 _tenuring_threshold = MaxTenuringThreshold; | |
343 | |
1282 | 344 // if G1FixedSurvivorSpaceSize is 0 which means the size is not |
345 // fixed, then _max_survivor_regions will be calculated at | |
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346 // calculate_young_list_target_length during initialization |
1282 | 347 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
545 | 348 |
1356 | 349 assert(GCTimeRatio > 0, |
350 "we should have set it to a default value set_g1_gc_flags() " | |
351 "if a user set it to 0"); | |
352 _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); | |
353 | |
342 | 354 initialize_all(); |
355 } | |
356 | |
357 // Increment "i", mod "len" | |
358 static void inc_mod(int& i, int len) { | |
359 i++; if (i == len) i = 0; | |
360 } | |
361 | |
362 void G1CollectorPolicy::initialize_flags() { | |
363 set_min_alignment(HeapRegion::GrainBytes); | |
364 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
547
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365 if (SurvivorRatio < 1) { |
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366 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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367 } |
342 | 368 CollectorPolicy::initialize_flags(); |
369 } | |
370 | |
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371 // The easiest way to deal with the parsing of the NewSize / |
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372 // MaxNewSize / etc. parameteres is to re-use the code in the |
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373 // TwoGenerationCollectorPolicy class. This is similar to what |
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374 // ParallelScavenge does with its GenerationSizer class (see |
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375 // ParallelScavengeHeap::initialize()). We might change this in the |
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376 // future, but it's a good start. |
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377 class G1YoungGenSizer : public TwoGenerationCollectorPolicy { |
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378 size_t size_to_region_num(size_t byte_size) { |
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379 return MAX2((size_t) 1, byte_size / HeapRegion::GrainBytes); |
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380 } |
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381 |
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382 public: |
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383 G1YoungGenSizer() { |
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384 initialize_flags(); |
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385 initialize_size_info(); |
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386 } |
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387 |
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388 size_t min_young_region_num() { |
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389 return size_to_region_num(_min_gen0_size); |
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390 } |
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391 size_t initial_young_region_num() { |
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392 return size_to_region_num(_initial_gen0_size); |
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393 } |
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394 size_t max_young_region_num() { |
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395 return size_to_region_num(_max_gen0_size); |
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396 } |
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397 }; |
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398 |
342 | 399 void G1CollectorPolicy::init() { |
400 // Set aside an initial future to_space. | |
401 _g1 = G1CollectedHeap::heap(); | |
402 | |
403 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
404 | |
545 | 405 initialize_gc_policy_counters(); |
406 | |
342 | 407 if (G1Gen) { |
408 _in_young_gc_mode = true; | |
409 | |
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410 G1YoungGenSizer sizer; |
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411 size_t initial_region_num = sizer.initial_young_region_num(); |
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412 |
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413 if (UseAdaptiveSizePolicy) { |
342 | 414 set_adaptive_young_list_length(true); |
415 _young_list_fixed_length = 0; | |
416 } else { | |
417 set_adaptive_young_list_length(false); | |
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418 _young_list_fixed_length = initial_region_num; |
342 | 419 } |
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420 _free_regions_at_end_of_collection = _g1->free_regions(); |
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421 calculate_young_list_min_length(); |
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422 guarantee( _young_list_min_length == 0, "invariant, not enough info" ); |
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423 calculate_young_list_target_length(); |
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424 } else { |
342 | 425 _young_list_fixed_length = 0; |
426 _in_young_gc_mode = false; | |
427 } | |
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428 |
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429 // We may immediately start allocating regions and placing them on the |
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430 // collection set list. Initialize the per-collection set info |
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431 start_incremental_cset_building(); |
342 | 432 } |
433 | |
545 | 434 // Create the jstat counters for the policy. |
435 void G1CollectorPolicy::initialize_gc_policy_counters() | |
436 { | |
437 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 2 + G1Gen); | |
438 } | |
439 | |
342 | 440 void G1CollectorPolicy::calculate_young_list_min_length() { |
441 _young_list_min_length = 0; | |
442 | |
443 if (!adaptive_young_list_length()) | |
444 return; | |
445 | |
446 if (_alloc_rate_ms_seq->num() > 3) { | |
447 double now_sec = os::elapsedTime(); | |
448 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; | |
449 double alloc_rate_ms = predict_alloc_rate_ms(); | |
450 int min_regions = (int) ceil(alloc_rate_ms * when_ms); | |
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451 int current_region_num = (int) _g1->young_list()->length(); |
342 | 452 _young_list_min_length = min_regions + current_region_num; |
453 } | |
454 } | |
455 | |
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456 void G1CollectorPolicy::calculate_young_list_target_length() { |
342 | 457 if (adaptive_young_list_length()) { |
458 size_t rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); | |
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459 calculate_young_list_target_length(rs_lengths); |
342 | 460 } else { |
461 if (full_young_gcs()) | |
462 _young_list_target_length = _young_list_fixed_length; | |
463 else | |
464 _young_list_target_length = _young_list_fixed_length / 2; | |
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465 |
342 | 466 _young_list_target_length = MAX2(_young_list_target_length, (size_t)1); |
467 } | |
545 | 468 calculate_survivors_policy(); |
342 | 469 } |
470 | |
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471 void G1CollectorPolicy::calculate_young_list_target_length(size_t rs_lengths) { |
342 | 472 guarantee( adaptive_young_list_length(), "pre-condition" ); |
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473 guarantee( !_in_marking_window || !_last_full_young_gc, "invariant" ); |
342 | 474 |
475 double start_time_sec = os::elapsedTime(); | |
1282 | 476 size_t min_reserve_perc = MAX2((size_t)2, (size_t)G1ReservePercent); |
342 | 477 min_reserve_perc = MIN2((size_t) 50, min_reserve_perc); |
478 size_t reserve_regions = | |
479 (size_t) ((double) min_reserve_perc * (double) _g1->n_regions() / 100.0); | |
480 | |
481 if (full_young_gcs() && _free_regions_at_end_of_collection > 0) { | |
482 // we are in fully-young mode and there are free regions in the heap | |
483 | |
545 | 484 double survivor_regions_evac_time = |
485 predict_survivor_regions_evac_time(); | |
486 | |
342 | 487 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
488 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); | |
489 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); | |
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490 size_t scanned_cards = predict_young_card_num(adj_rs_lengths); |
545 | 491 double base_time_ms = predict_base_elapsed_time_ms(pending_cards, scanned_cards) |
492 + survivor_regions_evac_time; | |
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493 |
342 | 494 // the result |
495 size_t final_young_length = 0; | |
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496 |
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497 size_t init_free_regions = |
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498 MAX2((size_t)0, _free_regions_at_end_of_collection - reserve_regions); |
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499 |
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500 // if we're still under the pause target... |
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501 if (base_time_ms <= target_pause_time_ms) { |
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502 // We make sure that the shortest young length that makes sense |
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503 // fits within the target pause time. |
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504 size_t min_young_length = 1; |
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505 |
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506 if (predict_will_fit(min_young_length, base_time_ms, |
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507 init_free_regions, target_pause_time_ms)) { |
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508 // The shortest young length will fit within the target pause time; |
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509 // we'll now check whether the absolute maximum number of young |
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510 // regions will fit in the target pause time. If not, we'll do |
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511 // a binary search between min_young_length and max_young_length |
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512 size_t abs_max_young_length = _free_regions_at_end_of_collection - 1; |
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513 size_t max_young_length = abs_max_young_length; |
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514 |
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515 if (max_young_length > min_young_length) { |
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516 // Let's check if the initial max young length will fit within the |
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517 // target pause. If so then there is no need to search for a maximal |
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518 // young length - we'll return the initial maximum |
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519 |
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520 if (predict_will_fit(max_young_length, base_time_ms, |
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521 init_free_regions, target_pause_time_ms)) { |
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522 // The maximum young length will satisfy the target pause time. |
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523 // We are done so set min young length to this maximum length. |
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524 // The code after the loop will then set final_young_length using |
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525 // the value cached in the minimum length. |
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526 min_young_length = max_young_length; |
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527 } else { |
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528 // The maximum possible number of young regions will not fit within |
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529 // the target pause time so let's search.... |
342 | 530 |
531 size_t diff = (max_young_length - min_young_length) / 2; | |
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532 max_young_length = min_young_length + diff; |
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533 |
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534 while (max_young_length > min_young_length) { |
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535 if (predict_will_fit(max_young_length, base_time_ms, |
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536 init_free_regions, target_pause_time_ms)) { |
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537 |
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538 // The current max young length will fit within the target |
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539 // pause time. Note we do not exit the loop here. By setting |
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540 // min = max, and then increasing the max below means that |
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541 // we will continue searching for an upper bound in the |
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542 // range [max..max+diff] |
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543 min_young_length = max_young_length; |
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544 } |
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545 diff = (max_young_length - min_young_length) / 2; |
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546 max_young_length = min_young_length + diff; |
342 | 547 } |
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548 // the above loop found a maximal young length that will fit |
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549 // within the target pause time. |
342 | 550 } |
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551 assert(min_young_length <= abs_max_young_length, "just checking"); |
342 | 552 } |
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553 final_young_length = min_young_length; |
342 | 554 } |
555 } | |
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556 // and we're done! |
342 | 557 |
558 // we should have at least one region in the target young length | |
545 | 559 _young_list_target_length = |
560 MAX2((size_t) 1, final_young_length + _recorded_survivor_regions); | |
342 | 561 |
562 // let's keep an eye of how long we spend on this calculation | |
563 // right now, I assume that we'll print it when we need it; we | |
564 // should really adde it to the breakdown of a pause | |
565 double end_time_sec = os::elapsedTime(); | |
566 double elapsed_time_ms = (end_time_sec - start_time_sec) * 1000.0; | |
567 | |
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568 #ifdef TRACE_CALC_YOUNG_LENGTH |
342 | 569 // leave this in for debugging, just in case |
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570 gclog_or_tty->print_cr("target = %1.1lf ms, young = " SIZE_FORMAT ", " |
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571 "elapsed %1.2lf ms, (%s%s) " SIZE_FORMAT SIZE_FORMAT, |
342 | 572 target_pause_time_ms, |
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573 _young_list_target_length |
342 | 574 elapsed_time_ms, |
575 full_young_gcs() ? "full" : "partial", | |
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576 during_initial_mark_pause() ? " i-m" : "", |
545 | 577 _in_marking_window, |
578 _in_marking_window_im); | |
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579 #endif // TRACE_CALC_YOUNG_LENGTH |
342 | 580 |
581 if (_young_list_target_length < _young_list_min_length) { | |
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582 // bummer; this means that, if we do a pause when the maximal |
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583 // length dictates, we'll violate the pause spacing target (the |
342 | 584 // min length was calculate based on the application's current |
585 // alloc rate); | |
586 | |
587 // so, we have to bite the bullet, and allocate the minimum | |
588 // number. We'll violate our target, but we just can't meet it. | |
589 | |
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590 #ifdef TRACE_CALC_YOUNG_LENGTH |
342 | 591 // leave this in for debugging, just in case |
592 gclog_or_tty->print_cr("adjusted target length from " | |
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593 SIZE_FORMAT " to " SIZE_FORMAT, |
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594 _young_list_target_length, _young_list_min_length); |
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595 #endif // TRACE_CALC_YOUNG_LENGTH |
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596 |
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597 _young_list_target_length = _young_list_min_length; |
342 | 598 } |
599 } else { | |
600 // we are in a partially-young mode or we've run out of regions (due | |
601 // to evacuation failure) | |
602 | |
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603 #ifdef TRACE_CALC_YOUNG_LENGTH |
342 | 604 // leave this in for debugging, just in case |
605 gclog_or_tty->print_cr("(partial) setting target to " SIZE_FORMAT | |
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606 _young_list_min_length); |
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607 #endif // TRACE_CALC_YOUNG_LENGTH |
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608 // we'll do the pause as soon as possible by choosing the minimum |
342 | 609 _young_list_target_length = |
610 MAX2(_young_list_min_length, (size_t) 1); | |
611 } | |
612 | |
613 _rs_lengths_prediction = rs_lengths; | |
614 } | |
615 | |
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616 // This is used by: calculate_young_list_target_length(rs_length). It |
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617 // returns true iff: |
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618 // the predicted pause time for the given young list will not overflow |
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619 // the target pause time |
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620 // and: |
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621 // the predicted amount of surviving data will not overflow the |
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622 // the amount of free space available for survivor regions. |
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623 // |
342 | 624 bool |
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625 G1CollectorPolicy::predict_will_fit(size_t young_length, |
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626 double base_time_ms, |
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627 size_t init_free_regions, |
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628 double target_pause_time_ms) { |
342 | 629 |
630 if (young_length >= init_free_regions) | |
631 // end condition 1: not enough space for the young regions | |
632 return false; | |
633 | |
634 double accum_surv_rate_adj = 0.0; | |
635 double accum_surv_rate = | |
636 accum_yg_surv_rate_pred((int)(young_length - 1)) - accum_surv_rate_adj; | |
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637 |
342 | 638 size_t bytes_to_copy = |
639 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); | |
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640 |
342 | 641 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
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642 |
342 | 643 double young_other_time_ms = |
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644 predict_young_other_time_ms(young_length); |
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645 |
342 | 646 double pause_time_ms = |
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647 base_time_ms + copy_time_ms + young_other_time_ms; |
342 | 648 |
649 if (pause_time_ms > target_pause_time_ms) | |
650 // end condition 2: over the target pause time | |
651 return false; | |
652 | |
653 size_t free_bytes = | |
654 (init_free_regions - young_length) * HeapRegion::GrainBytes; | |
655 | |
656 if ((2.0 + sigma()) * (double) bytes_to_copy > (double) free_bytes) | |
657 // end condition 3: out of to-space (conservatively) | |
658 return false; | |
659 | |
660 // success! | |
661 return true; | |
662 } | |
663 | |
545 | 664 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
665 double survivor_regions_evac_time = 0.0; | |
666 for (HeapRegion * r = _recorded_survivor_head; | |
667 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
668 r = r->get_next_young_region()) { | |
669 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); | |
670 } | |
671 return survivor_regions_evac_time; | |
672 } | |
673 | |
342 | 674 void G1CollectorPolicy::check_prediction_validity() { |
675 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); | |
676 | |
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677 size_t rs_lengths = _g1->young_list()->sampled_rs_lengths(); |
342 | 678 if (rs_lengths > _rs_lengths_prediction) { |
679 // add 10% to avoid having to recalculate often | |
680 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
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681 calculate_young_list_target_length(rs_lengths_prediction); |
342 | 682 } |
683 } | |
684 | |
685 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, | |
686 bool is_tlab, | |
687 bool* gc_overhead_limit_was_exceeded) { | |
688 guarantee(false, "Not using this policy feature yet."); | |
689 return NULL; | |
690 } | |
691 | |
692 // This method controls how a collector handles one or more | |
693 // of its generations being fully allocated. | |
694 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
695 bool is_tlab) { | |
696 guarantee(false, "Not using this policy feature yet."); | |
697 return NULL; | |
698 } | |
699 | |
700 | |
701 #ifndef PRODUCT | |
702 bool G1CollectorPolicy::verify_young_ages() { | |
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703 HeapRegion* head = _g1->young_list()->first_region(); |
342 | 704 return |
705 verify_young_ages(head, _short_lived_surv_rate_group); | |
706 // also call verify_young_ages on any additional surv rate groups | |
707 } | |
708 | |
709 bool | |
710 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
711 SurvRateGroup *surv_rate_group) { | |
712 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
713 | |
714 const char* name = surv_rate_group->name(); | |
715 bool ret = true; | |
716 int prev_age = -1; | |
717 | |
718 for (HeapRegion* curr = head; | |
719 curr != NULL; | |
720 curr = curr->get_next_young_region()) { | |
721 SurvRateGroup* group = curr->surv_rate_group(); | |
722 if (group == NULL && !curr->is_survivor()) { | |
723 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
724 ret = false; | |
725 } | |
726 | |
727 if (surv_rate_group == group) { | |
728 int age = curr->age_in_surv_rate_group(); | |
729 | |
730 if (age < 0) { | |
731 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
732 ret = false; | |
733 } | |
734 | |
735 if (age <= prev_age) { | |
736 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
737 "(%d, %d)", name, age, prev_age); | |
738 ret = false; | |
739 } | |
740 prev_age = age; | |
741 } | |
742 } | |
743 | |
744 return ret; | |
745 } | |
746 #endif // PRODUCT | |
747 | |
748 void G1CollectorPolicy::record_full_collection_start() { | |
749 _cur_collection_start_sec = os::elapsedTime(); | |
750 // Release the future to-space so that it is available for compaction into. | |
751 _g1->set_full_collection(); | |
752 } | |
753 | |
754 void G1CollectorPolicy::record_full_collection_end() { | |
755 // Consider this like a collection pause for the purposes of allocation | |
756 // since last pause. | |
757 double end_sec = os::elapsedTime(); | |
758 double full_gc_time_sec = end_sec - _cur_collection_start_sec; | |
759 double full_gc_time_ms = full_gc_time_sec * 1000.0; | |
760 | |
761 _all_full_gc_times_ms->add(full_gc_time_ms); | |
762 | |
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763 update_recent_gc_times(end_sec, full_gc_time_ms); |
342 | 764 |
765 _g1->clear_full_collection(); | |
766 | |
767 // "Nuke" the heuristics that control the fully/partially young GC | |
768 // transitions and make sure we start with fully young GCs after the | |
769 // Full GC. | |
770 set_full_young_gcs(true); | |
771 _last_full_young_gc = false; | |
772 _should_revert_to_full_young_gcs = false; | |
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773 clear_initiate_conc_mark_if_possible(); |
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774 clear_during_initial_mark_pause(); |
342 | 775 _known_garbage_bytes = 0; |
776 _known_garbage_ratio = 0.0; | |
777 _in_marking_window = false; | |
778 _in_marking_window_im = false; | |
779 | |
780 _short_lived_surv_rate_group->start_adding_regions(); | |
781 // also call this on any additional surv rate groups | |
782 | |
545 | 783 record_survivor_regions(0, NULL, NULL); |
784 | |
342 | 785 _prev_region_num_young = _region_num_young; |
786 _prev_region_num_tenured = _region_num_tenured; | |
787 | |
788 _free_regions_at_end_of_collection = _g1->free_regions(); | |
545 | 789 // Reset survivors SurvRateGroup. |
790 _survivor_surv_rate_group->reset(); | |
342 | 791 calculate_young_list_min_length(); |
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792 calculate_young_list_target_length(); |
342 | 793 } |
794 | |
795 void G1CollectorPolicy::record_before_bytes(size_t bytes) { | |
796 _bytes_in_to_space_before_gc += bytes; | |
797 } | |
798 | |
799 void G1CollectorPolicy::record_after_bytes(size_t bytes) { | |
800 _bytes_in_to_space_after_gc += bytes; | |
801 } | |
802 | |
803 void G1CollectorPolicy::record_stop_world_start() { | |
804 _stop_world_start = os::elapsedTime(); | |
805 } | |
806 | |
807 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, | |
808 size_t start_used) { | |
809 if (PrintGCDetails) { | |
810 gclog_or_tty->stamp(PrintGCTimeStamps); | |
811 gclog_or_tty->print("[GC pause"); | |
812 if (in_young_gc_mode()) | |
813 gclog_or_tty->print(" (%s)", full_young_gcs() ? "young" : "partial"); | |
814 } | |
815 | |
816 assert(_g1->used_regions() == _g1->recalculate_used_regions(), | |
817 "sanity"); | |
636 | 818 assert(_g1->used() == _g1->recalculate_used(), "sanity"); |
342 | 819 |
820 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
821 _all_stop_world_times_ms->add(s_w_t_ms); | |
822 _stop_world_start = 0.0; | |
823 | |
824 _cur_collection_start_sec = start_time_sec; | |
825 _cur_collection_pause_used_at_start_bytes = start_used; | |
826 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); | |
827 _pending_cards = _g1->pending_card_num(); | |
828 _max_pending_cards = _g1->max_pending_card_num(); | |
829 | |
830 _bytes_in_to_space_before_gc = 0; | |
831 _bytes_in_to_space_after_gc = 0; | |
832 _bytes_in_collection_set_before_gc = 0; | |
833 | |
834 #ifdef DEBUG | |
835 // initialise these to something well known so that we can spot | |
836 // if they are not set properly | |
837 | |
838 for (int i = 0; i < _parallel_gc_threads; ++i) { | |
1611 | 839 _par_last_gc_worker_start_times_ms[i] = -1234.0; |
840 _par_last_ext_root_scan_times_ms[i] = -1234.0; | |
841 _par_last_mark_stack_scan_times_ms[i] = -1234.0; | |
842 _par_last_update_rs_times_ms[i] = -1234.0; | |
843 _par_last_update_rs_processed_buffers[i] = -1234.0; | |
844 _par_last_scan_rs_times_ms[i] = -1234.0; | |
845 _par_last_scan_new_refs_times_ms[i] = -1234.0; | |
846 _par_last_obj_copy_times_ms[i] = -1234.0; | |
847 _par_last_termination_times_ms[i] = -1234.0; | |
848 _par_last_termination_attempts[i] = -1234.0; | |
849 _par_last_gc_worker_end_times_ms[i] = -1234.0; | |
342 | 850 } |
851 #endif | |
852 | |
853 for (int i = 0; i < _aux_num; ++i) { | |
854 _cur_aux_times_ms[i] = 0.0; | |
855 _cur_aux_times_set[i] = false; | |
856 } | |
857 | |
858 _satb_drain_time_set = false; | |
859 _last_satb_drain_processed_buffers = -1; | |
860 | |
861 if (in_young_gc_mode()) | |
862 _last_young_gc_full = false; | |
863 | |
864 // do that for any other surv rate groups | |
865 _short_lived_surv_rate_group->stop_adding_regions(); | |
1282 | 866 _survivors_age_table.clear(); |
545 | 867 |
342 | 868 assert( verify_young_ages(), "region age verification" ); |
869 } | |
870 | |
871 void G1CollectorPolicy::record_mark_closure_time(double mark_closure_time_ms) { | |
872 _mark_closure_time_ms = mark_closure_time_ms; | |
873 } | |
874 | |
875 void G1CollectorPolicy::record_concurrent_mark_init_start() { | |
876 _mark_init_start_sec = os::elapsedTime(); | |
877 guarantee(!in_young_gc_mode(), "should not do be here in young GC mode"); | |
878 } | |
879 | |
880 void G1CollectorPolicy::record_concurrent_mark_init_end_pre(double | |
881 mark_init_elapsed_time_ms) { | |
882 _during_marking = true; | |
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883 assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
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884 clear_during_initial_mark_pause(); |
342 | 885 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
886 } | |
887 | |
888 void G1CollectorPolicy::record_concurrent_mark_init_end() { | |
889 double end_time_sec = os::elapsedTime(); | |
890 double elapsed_time_ms = (end_time_sec - _mark_init_start_sec) * 1000.0; | |
891 _concurrent_mark_init_times_ms->add(elapsed_time_ms); | |
892 record_concurrent_mark_init_end_pre(elapsed_time_ms); | |
893 | |
894 _mmu_tracker->add_pause(_mark_init_start_sec, end_time_sec, true); | |
895 } | |
896 | |
897 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
898 _mark_remark_start_sec = os::elapsedTime(); | |
899 _during_marking = false; | |
900 } | |
901 | |
902 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
903 double end_time_sec = os::elapsedTime(); | |
904 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
905 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
906 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
907 _prev_collection_pause_end_ms += elapsed_time_ms; | |
908 | |
909 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
910 } | |
911 | |
912 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
913 _mark_cleanup_start_sec = os::elapsedTime(); | |
914 } | |
915 | |
916 void | |
917 G1CollectorPolicy::record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
918 size_t max_live_bytes) { | |
919 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
920 record_concurrent_mark_cleanup_end_work2(); | |
921 } | |
922 | |
923 void | |
924 G1CollectorPolicy:: | |
925 record_concurrent_mark_cleanup_end_work1(size_t freed_bytes, | |
926 size_t max_live_bytes) { | |
927 if (_n_marks < 2) _n_marks++; | |
928 if (G1PolicyVerbose > 0) | |
929 gclog_or_tty->print_cr("At end of marking, max_live is " SIZE_FORMAT " MB " | |
930 " (of " SIZE_FORMAT " MB heap).", | |
931 max_live_bytes/M, _g1->capacity()/M); | |
932 } | |
933 | |
934 // The important thing about this is that it includes "os::elapsedTime". | |
935 void G1CollectorPolicy::record_concurrent_mark_cleanup_end_work2() { | |
936 double end_time_sec = os::elapsedTime(); | |
937 double elapsed_time_ms = (end_time_sec - _mark_cleanup_start_sec)*1000.0; | |
938 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
939 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
940 _prev_collection_pause_end_ms += elapsed_time_ms; | |
941 | |
942 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_time_sec, true); | |
943 | |
944 _num_markings++; | |
945 | |
946 // We did a marking, so reset the "since_last_mark" variables. | |
947 double considerConcMarkCost = 1.0; | |
948 // If there are available processors, concurrent activity is free... | |
949 if (Threads::number_of_non_daemon_threads() * 2 < | |
950 os::active_processor_count()) { | |
951 considerConcMarkCost = 0.0; | |
952 } | |
953 _n_pauses_at_mark_end = _n_pauses; | |
954 _n_marks_since_last_pause++; | |
955 } | |
956 | |
957 void | |
958 G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { | |
959 if (in_young_gc_mode()) { | |
960 _should_revert_to_full_young_gcs = false; | |
961 _last_full_young_gc = true; | |
962 _in_marking_window = false; | |
963 if (adaptive_young_list_length()) | |
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964 calculate_young_list_target_length(); |
342 | 965 } |
966 } | |
967 | |
968 void G1CollectorPolicy::record_concurrent_pause() { | |
969 if (_stop_world_start > 0.0) { | |
970 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
971 _all_yield_times_ms->add(yield_ms); | |
972 } | |
973 } | |
974 | |
975 void G1CollectorPolicy::record_concurrent_pause_end() { | |
976 } | |
977 | |
978 void G1CollectorPolicy::record_collection_pause_end_CH_strong_roots() { | |
979 _cur_CH_strong_roots_end_sec = os::elapsedTime(); | |
980 _cur_CH_strong_roots_dur_ms = | |
981 (_cur_CH_strong_roots_end_sec - _cur_collection_start_sec) * 1000.0; | |
982 } | |
983 | |
984 void G1CollectorPolicy::record_collection_pause_end_G1_strong_roots() { | |
985 _cur_G1_strong_roots_end_sec = os::elapsedTime(); | |
986 _cur_G1_strong_roots_dur_ms = | |
987 (_cur_G1_strong_roots_end_sec - _cur_CH_strong_roots_end_sec) * 1000.0; | |
988 } | |
989 | |
990 template<class T> | |
991 T sum_of(T* sum_arr, int start, int n, int N) { | |
992 T sum = (T)0; | |
993 for (int i = 0; i < n; i++) { | |
994 int j = (start + i) % N; | |
995 sum += sum_arr[j]; | |
996 } | |
997 return sum; | |
998 } | |
999 | |
1611 | 1000 void G1CollectorPolicy::print_par_stats(int level, |
1001 const char* str, | |
1002 double* data, | |
342 | 1003 bool summary) { |
1004 double min = data[0], max = data[0]; | |
1005 double total = 0.0; | |
1006 int j; | |
1007 for (j = 0; j < level; ++j) | |
1008 gclog_or_tty->print(" "); | |
1009 gclog_or_tty->print("[%s (ms):", str); | |
1010 for (uint i = 0; i < ParallelGCThreads; ++i) { | |
1011 double val = data[i]; | |
1012 if (val < min) | |
1013 min = val; | |
1014 if (val > max) | |
1015 max = val; | |
1016 total += val; | |
1017 gclog_or_tty->print(" %3.1lf", val); | |
1018 } | |
1019 if (summary) { | |
1020 gclog_or_tty->print_cr(""); | |
1021 double avg = total / (double) ParallelGCThreads; | |
1022 gclog_or_tty->print(" "); | |
1023 for (j = 0; j < level; ++j) | |
1024 gclog_or_tty->print(" "); | |
1025 gclog_or_tty->print("Avg: %5.1lf, Min: %5.1lf, Max: %5.1lf", | |
1026 avg, min, max); | |
1027 } | |
1028 gclog_or_tty->print_cr("]"); | |
1029 } | |
1030 | |
1611 | 1031 void G1CollectorPolicy::print_par_sizes(int level, |
1032 const char* str, | |
1033 double* data, | |
1034 bool summary) { | |
342 | 1035 double min = data[0], max = data[0]; |
1036 double total = 0.0; | |
1037 int j; | |
1038 for (j = 0; j < level; ++j) | |
1039 gclog_or_tty->print(" "); | |
1040 gclog_or_tty->print("[%s :", str); | |
1041 for (uint i = 0; i < ParallelGCThreads; ++i) { | |
1042 double val = data[i]; | |
1043 if (val < min) | |
1044 min = val; | |
1045 if (val > max) | |
1046 max = val; | |
1047 total += val; | |
1048 gclog_or_tty->print(" %d", (int) val); | |
1049 } | |
1050 if (summary) { | |
1051 gclog_or_tty->print_cr(""); | |
1052 double avg = total / (double) ParallelGCThreads; | |
1053 gclog_or_tty->print(" "); | |
1054 for (j = 0; j < level; ++j) | |
1055 gclog_or_tty->print(" "); | |
1056 gclog_or_tty->print("Sum: %d, Avg: %d, Min: %d, Max: %d", | |
1057 (int)total, (int)avg, (int)min, (int)max); | |
1058 } | |
1059 gclog_or_tty->print_cr("]"); | |
1060 } | |
1061 | |
1062 void G1CollectorPolicy::print_stats (int level, | |
1063 const char* str, | |
1064 double value) { | |
1065 for (int j = 0; j < level; ++j) | |
1066 gclog_or_tty->print(" "); | |
1067 gclog_or_tty->print_cr("[%s: %5.1lf ms]", str, value); | |
1068 } | |
1069 | |
1070 void G1CollectorPolicy::print_stats (int level, | |
1071 const char* str, | |
1072 int value) { | |
1073 for (int j = 0; j < level; ++j) | |
1074 gclog_or_tty->print(" "); | |
1075 gclog_or_tty->print_cr("[%s: %d]", str, value); | |
1076 } | |
1077 | |
1078 double G1CollectorPolicy::avg_value (double* data) { | |
1079 if (ParallelGCThreads > 0) { | |
1080 double ret = 0.0; | |
1081 for (uint i = 0; i < ParallelGCThreads; ++i) | |
1082 ret += data[i]; | |
1083 return ret / (double) ParallelGCThreads; | |
1084 } else { | |
1085 return data[0]; | |
1086 } | |
1087 } | |
1088 | |
1089 double G1CollectorPolicy::max_value (double* data) { | |
1090 if (ParallelGCThreads > 0) { | |
1091 double ret = data[0]; | |
1092 for (uint i = 1; i < ParallelGCThreads; ++i) | |
1093 if (data[i] > ret) | |
1094 ret = data[i]; | |
1095 return ret; | |
1096 } else { | |
1097 return data[0]; | |
1098 } | |
1099 } | |
1100 | |
1101 double G1CollectorPolicy::sum_of_values (double* data) { | |
1102 if (ParallelGCThreads > 0) { | |
1103 double sum = 0.0; | |
1104 for (uint i = 0; i < ParallelGCThreads; i++) | |
1105 sum += data[i]; | |
1106 return sum; | |
1107 } else { | |
1108 return data[0]; | |
1109 } | |
1110 } | |
1111 | |
1112 double G1CollectorPolicy::max_sum (double* data1, | |
1113 double* data2) { | |
1114 double ret = data1[0] + data2[0]; | |
1115 | |
1116 if (ParallelGCThreads > 0) { | |
1117 for (uint i = 1; i < ParallelGCThreads; ++i) { | |
1118 double data = data1[i] + data2[i]; | |
1119 if (data > ret) | |
1120 ret = data; | |
1121 } | |
1122 } | |
1123 return ret; | |
1124 } | |
1125 | |
1126 // Anything below that is considered to be zero | |
1127 #define MIN_TIMER_GRANULARITY 0.0000001 | |
1128 | |
677 | 1129 void G1CollectorPolicy::record_collection_pause_end(bool abandoned) { |
342 | 1130 double end_time_sec = os::elapsedTime(); |
1131 double elapsed_ms = _last_pause_time_ms; | |
1132 bool parallel = ParallelGCThreads > 0; | |
1133 double evac_ms = (end_time_sec - _cur_G1_strong_roots_end_sec) * 1000.0; | |
1134 size_t rs_size = | |
1135 _cur_collection_pause_used_regions_at_start - collection_set_size(); | |
1136 size_t cur_used_bytes = _g1->used(); | |
1137 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
1138 bool last_pause_included_initial_mark = false; | |
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1139 bool update_stats = !abandoned && !_g1->evacuation_failed(); |
342 | 1140 |
1141 #ifndef PRODUCT | |
1142 if (G1YoungSurvRateVerbose) { | |
1143 gclog_or_tty->print_cr(""); | |
1144 _short_lived_surv_rate_group->print(); | |
1145 // do that for any other surv rate groups too | |
1146 } | |
1147 #endif // PRODUCT | |
1148 | |
1149 if (in_young_gc_mode()) { | |
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1150 last_pause_included_initial_mark = during_initial_mark_pause(); |
342 | 1151 if (last_pause_included_initial_mark) |
1152 record_concurrent_mark_init_end_pre(0.0); | |
1153 | |
1154 size_t min_used_targ = | |
1283
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1155 (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
342 | 1156 |
1359
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1157 |
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1158 if (!_g1->mark_in_progress() && !_last_full_young_gc) { |
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1159 assert(!last_pause_included_initial_mark, "invariant"); |
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1160 if (cur_used_bytes > min_used_targ && |
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1161 cur_used_bytes > _prev_collection_pause_used_at_end_bytes) { |
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1162 assert(!during_initial_mark_pause(), "we should not see this here"); |
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1163 |
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1164 // Note: this might have already been set, if during the last |
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1165 // pause we decided to start a cycle but at the beginning of |
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1166 // this pause we decided to postpone it. That's OK. |
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1167 set_initiate_conc_mark_if_possible(); |
342 | 1168 } |
1169 } | |
1170 | |
1171 _prev_collection_pause_used_at_end_bytes = cur_used_bytes; | |
1172 } | |
1173 | |
1174 _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0, | |
1175 end_time_sec, false); | |
1176 | |
1177 guarantee(_cur_collection_pause_used_regions_at_start >= | |
1178 collection_set_size(), | |
1179 "Negative RS size?"); | |
1180 | |
1181 // This assert is exempted when we're doing parallel collection pauses, | |
1182 // because the fragmentation caused by the parallel GC allocation buffers | |
1183 // can lead to more memory being used during collection than was used | |
1184 // before. Best leave this out until the fragmentation problem is fixed. | |
1185 // Pauses in which evacuation failed can also lead to negative | |
1186 // collections, since no space is reclaimed from a region containing an | |
1187 // object whose evacuation failed. | |
1188 // Further, we're now always doing parallel collection. But I'm still | |
1189 // leaving this here as a placeholder for a more precise assertion later. | |
1190 // (DLD, 10/05.) | |
1191 assert((true || parallel) // Always using GC LABs now. | |
1192 || _g1->evacuation_failed() | |
1193 || _cur_collection_pause_used_at_start_bytes >= cur_used_bytes, | |
1194 "Negative collection"); | |
1195 | |
1196 size_t freed_bytes = | |
1197 _cur_collection_pause_used_at_start_bytes - cur_used_bytes; | |
1198 size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; | |
1394
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1199 |
342 | 1200 double survival_fraction = |
1201 (double)surviving_bytes/ | |
1202 (double)_collection_set_bytes_used_before; | |
1203 | |
1204 _n_pauses++; | |
1205 | |
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1206 if (update_stats) { |
342 | 1207 _recent_CH_strong_roots_times_ms->add(_cur_CH_strong_roots_dur_ms); |
1208 _recent_G1_strong_roots_times_ms->add(_cur_G1_strong_roots_dur_ms); | |
1209 _recent_evac_times_ms->add(evac_ms); | |
1210 _recent_pause_times_ms->add(elapsed_ms); | |
1211 | |
1212 _recent_rs_sizes->add(rs_size); | |
1213 | |
1214 // We exempt parallel collection from this check because Alloc Buffer | |
1215 // fragmentation can produce negative collections. Same with evac | |
1216 // failure. | |
1217 // Further, we're now always doing parallel collection. But I'm still | |
1218 // leaving this here as a placeholder for a more precise assertion later. | |
1219 // (DLD, 10/05. | |
1220 assert((true || parallel) | |
1221 || _g1->evacuation_failed() | |
1222 || surviving_bytes <= _collection_set_bytes_used_before, | |
1223 "Or else negative collection!"); | |
1224 _recent_CS_bytes_used_before->add(_collection_set_bytes_used_before); | |
1225 _recent_CS_bytes_surviving->add(surviving_bytes); | |
1226 | |
1227 // this is where we update the allocation rate of the application | |
1228 double app_time_ms = | |
1229 (_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms); | |
1230 if (app_time_ms < MIN_TIMER_GRANULARITY) { | |
1231 // This usually happens due to the timer not having the required | |
1232 // granularity. Some Linuxes are the usual culprits. | |
1233 // We'll just set it to something (arbitrarily) small. | |
1234 app_time_ms = 1.0; | |
1235 } | |
1236 size_t regions_allocated = | |
1237 (_region_num_young - _prev_region_num_young) + | |
1238 (_region_num_tenured - _prev_region_num_tenured); | |
1239 double alloc_rate_ms = (double) regions_allocated / app_time_ms; | |
1240 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
1241 _prev_region_num_young = _region_num_young; | |
1242 _prev_region_num_tenured = _region_num_tenured; | |
1243 | |
1244 double interval_ms = | |
1245 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
1246 update_recent_gc_times(end_time_sec, elapsed_ms); | |
1247 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; | |
1086
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1248 if (recent_avg_pause_time_ratio() < 0.0 || |
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1249 (recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
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1250 #ifndef PRODUCT |
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1251 // Dump info to allow post-facto debugging |
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1252 gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
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1253 gclog_or_tty->print_cr("-------------------------------------------"); |
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1254 gclog_or_tty->print_cr("Recent GC Times (ms):"); |
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1255 _recent_gc_times_ms->dump(); |
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1256 gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
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1257 _recent_prev_end_times_for_all_gcs_sec->dump(); |
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1258 gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
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1259 _recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
1087
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1260 // In debug mode, terminate the JVM if the user wants to debug at this point. |
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1261 assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
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1262 #endif // !PRODUCT |
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1263 // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
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1264 // CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
1086
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1265 if (_recent_avg_pause_time_ratio < 0.0) { |
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1266 _recent_avg_pause_time_ratio = 0.0; |
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1267 } else { |
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1268 assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
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1269 _recent_avg_pause_time_ratio = 1.0; |
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1270 } |
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1271 } |
342 | 1272 } |
1273 | |
1274 if (G1PolicyVerbose > 1) { | |
1275 gclog_or_tty->print_cr(" Recording collection pause(%d)", _n_pauses); | |
1276 } | |
1277 | |
1278 PauseSummary* summary; | |
677 | 1279 if (abandoned) { |
1280 summary = _abandoned_summary; | |
1281 } else { | |
1282 summary = _summary; | |
342 | 1283 } |
1284 | |
1285 double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); | |
1286 double mark_stack_scan_time = avg_value(_par_last_mark_stack_scan_times_ms); | |
1287 double update_rs_time = avg_value(_par_last_update_rs_times_ms); | |
1288 double update_rs_processed_buffers = | |
1289 sum_of_values(_par_last_update_rs_processed_buffers); | |
1290 double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); | |
1291 double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); | |
1292 double termination_time = avg_value(_par_last_termination_times_ms); | |
1293 | |
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1294 double parallel_other_time = _cur_collection_par_time_ms - |
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1295 (update_rs_time + ext_root_scan_time + mark_stack_scan_time + |
1394
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1296 scan_rs_time + obj_copy_time + termination_time); |
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1297 if (update_stats) { |
342 | 1298 MainBodySummary* body_summary = summary->main_body_summary(); |
1299 guarantee(body_summary != NULL, "should not be null!"); | |
1300 | |
1301 if (_satb_drain_time_set) | |
1302 body_summary->record_satb_drain_time_ms(_cur_satb_drain_time_ms); | |
1303 else | |
1304 body_summary->record_satb_drain_time_ms(0.0); | |
1305 body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); | |
1306 body_summary->record_mark_stack_scan_time_ms(mark_stack_scan_time); | |
1307 body_summary->record_update_rs_time_ms(update_rs_time); | |
1308 body_summary->record_scan_rs_time_ms(scan_rs_time); | |
1309 body_summary->record_obj_copy_time_ms(obj_copy_time); | |
1310 if (parallel) { | |
1311 body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); | |
1312 body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); | |
1313 body_summary->record_termination_time_ms(termination_time); | |
1314 body_summary->record_parallel_other_time_ms(parallel_other_time); | |
1315 } | |
1316 body_summary->record_mark_closure_time_ms(_mark_closure_time_ms); | |
1317 } | |
1318 | |
1319 if (G1PolicyVerbose > 1) { | |
1320 gclog_or_tty->print_cr(" ET: %10.6f ms (avg: %10.6f ms)\n" | |
1321 " CH Strong: %10.6f ms (avg: %10.6f ms)\n" | |
1322 " G1 Strong: %10.6f ms (avg: %10.6f ms)\n" | |
1323 " Evac: %10.6f ms (avg: %10.6f ms)\n" | |
1324 " ET-RS: %10.6f ms (avg: %10.6f ms)\n" | |
1325 " |RS|: " SIZE_FORMAT, | |
1326 elapsed_ms, recent_avg_time_for_pauses_ms(), | |
1327 _cur_CH_strong_roots_dur_ms, recent_avg_time_for_CH_strong_ms(), | |
1328 _cur_G1_strong_roots_dur_ms, recent_avg_time_for_G1_strong_ms(), | |
1329 evac_ms, recent_avg_time_for_evac_ms(), | |
1330 scan_rs_time, | |
1331 recent_avg_time_for_pauses_ms() - | |
1332 recent_avg_time_for_G1_strong_ms(), | |
1333 rs_size); | |
1334 | |
1335 gclog_or_tty->print_cr(" Used at start: " SIZE_FORMAT"K" | |
1336 " At end " SIZE_FORMAT "K\n" | |
1337 " garbage : " SIZE_FORMAT "K" | |
1338 " of " SIZE_FORMAT "K\n" | |
1339 " survival : %6.2f%% (%6.2f%% avg)", | |
1340 _cur_collection_pause_used_at_start_bytes/K, | |
1341 _g1->used()/K, freed_bytes/K, | |
1342 _collection_set_bytes_used_before/K, | |
1343 survival_fraction*100.0, | |
1344 recent_avg_survival_fraction()*100.0); | |
1345 gclog_or_tty->print_cr(" Recent %% gc pause time: %6.2f", | |
1346 recent_avg_pause_time_ratio() * 100.0); | |
1347 } | |
1348 | |
1349 double other_time_ms = elapsed_ms; | |
1350 | |
1351 if (!abandoned) { | |
1352 if (_satb_drain_time_set) | |
1353 other_time_ms -= _cur_satb_drain_time_ms; | |
1354 | |
1355 if (parallel) | |
1356 other_time_ms -= _cur_collection_par_time_ms + _cur_clear_ct_time_ms; | |
1357 else | |
1358 other_time_ms -= | |
1359 update_rs_time + | |
1394
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1360 ext_root_scan_time + mark_stack_scan_time + |
342 | 1361 scan_rs_time + obj_copy_time; |
1362 } | |
1363 | |
1364 if (PrintGCDetails) { | |
1365 gclog_or_tty->print_cr("%s%s, %1.8lf secs]", | |
677 | 1366 abandoned ? " (abandoned)" : "", |
342 | 1367 (last_pause_included_initial_mark) ? " (initial-mark)" : "", |
1368 elapsed_ms / 1000.0); | |
1369 | |
1370 if (!abandoned) { | |
677 | 1371 if (_satb_drain_time_set) { |
342 | 1372 print_stats(1, "SATB Drain Time", _cur_satb_drain_time_ms); |
677 | 1373 } |
1374 if (_last_satb_drain_processed_buffers >= 0) { | |
342 | 1375 print_stats(2, "Processed Buffers", _last_satb_drain_processed_buffers); |
677 | 1376 } |
1377 if (parallel) { | |
1378 print_stats(1, "Parallel Time", _cur_collection_par_time_ms); | |
1611 | 1379 print_par_stats(2, "GC Worker Start Time", |
1380 _par_last_gc_worker_start_times_ms, false); | |
677 | 1381 print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); |
1611 | 1382 print_par_sizes(3, "Processed Buffers", |
1383 _par_last_update_rs_processed_buffers, true); | |
1384 print_par_stats(2, "Ext Root Scanning", | |
1385 _par_last_ext_root_scan_times_ms); | |
1386 print_par_stats(2, "Mark Stack Scanning", | |
1387 _par_last_mark_stack_scan_times_ms); | |
342 | 1388 print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms); |
1389 print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms); | |
1390 print_par_stats(2, "Termination", _par_last_termination_times_ms); | |
1611 | 1391 print_par_sizes(3, "Termination Attempts", |
1392 _par_last_termination_attempts, true); | |
1393 print_par_stats(2, "GC Worker End Time", | |
1394 _par_last_gc_worker_end_times_ms, false); | |
342 | 1395 print_stats(2, "Other", parallel_other_time); |
1396 print_stats(1, "Clear CT", _cur_clear_ct_time_ms); | |
677 | 1397 } else { |
1398 print_stats(1, "Update RS", update_rs_time); | |
794 | 1399 print_stats(2, "Processed Buffers", |
1400 (int)update_rs_processed_buffers); | |
342 | 1401 print_stats(1, "Ext Root Scanning", ext_root_scan_time); |
1402 print_stats(1, "Mark Stack Scanning", mark_stack_scan_time); | |
1403 print_stats(1, "Scan RS", scan_rs_time); | |
1404 print_stats(1, "Object Copying", obj_copy_time); | |
1405 } | |
1406 } | |
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1407 #ifndef PRODUCT |
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1408 print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms); |
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1409 print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms); |
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1410 print_stats(1, "Min Clear CC", _min_clear_cc_time_ms); |
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1411 print_stats(1, "Max Clear CC", _max_clear_cc_time_ms); |
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1412 if (_num_cc_clears > 0) { |
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1413 print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears)); |
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1414 } |
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1415 #endif |
342 | 1416 print_stats(1, "Other", other_time_ms); |
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1417 print_stats(2, "Choose CSet", _recorded_young_cset_choice_time_ms); |
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1418 |
342 | 1419 for (int i = 0; i < _aux_num; ++i) { |
1420 if (_cur_aux_times_set[i]) { | |
1421 char buffer[96]; | |
1422 sprintf(buffer, "Aux%d", i); | |
1423 print_stats(1, buffer, _cur_aux_times_ms[i]); | |
1424 } | |
1425 } | |
1426 } | |
1427 if (PrintGCDetails) | |
1428 gclog_or_tty->print(" ["); | |
1429 if (PrintGC || PrintGCDetails) | |
1430 _g1->print_size_transition(gclog_or_tty, | |
1431 _cur_collection_pause_used_at_start_bytes, | |
1432 _g1->used(), _g1->capacity()); | |
1433 if (PrintGCDetails) | |
1434 gclog_or_tty->print_cr("]"); | |
1435 | |
1436 _all_pause_times_ms->add(elapsed_ms); | |
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1437 if (update_stats) { |
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1438 summary->record_total_time_ms(elapsed_ms); |
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1439 summary->record_other_time_ms(other_time_ms); |
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1440 } |
342 | 1441 for (int i = 0; i < _aux_num; ++i) |
1442 if (_cur_aux_times_set[i]) | |
1443 _all_aux_times_ms[i].add(_cur_aux_times_ms[i]); | |
1444 | |
1445 // Reset marks-between-pauses counter. | |
1446 _n_marks_since_last_pause = 0; | |
1447 | |
1448 // Update the efficiency-since-mark vars. | |
1449 double proc_ms = elapsed_ms * (double) _parallel_gc_threads; | |
1450 if (elapsed_ms < MIN_TIMER_GRANULARITY) { | |
1451 // This usually happens due to the timer not having the required | |
1452 // granularity. Some Linuxes are the usual culprits. | |
1453 // We'll just set it to something (arbitrarily) small. | |
1454 proc_ms = 1.0; | |
1455 } | |
1456 double cur_efficiency = (double) freed_bytes / proc_ms; | |
1457 | |
1458 bool new_in_marking_window = _in_marking_window; | |
1459 bool new_in_marking_window_im = false; | |
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1460 if (during_initial_mark_pause()) { |
342 | 1461 new_in_marking_window = true; |
1462 new_in_marking_window_im = true; | |
1463 } | |
1464 | |
1465 if (in_young_gc_mode()) { | |
1466 if (_last_full_young_gc) { | |
1467 set_full_young_gcs(false); | |
1468 _last_full_young_gc = false; | |
1469 } | |
1470 | |
1471 if ( !_last_young_gc_full ) { | |
1472 if ( _should_revert_to_full_young_gcs || | |
1473 _known_garbage_ratio < 0.05 || | |
1474 (adaptive_young_list_length() && | |
1475 (get_gc_eff_factor() * cur_efficiency < predict_young_gc_eff())) ) { | |
1476 set_full_young_gcs(true); | |
1477 } | |
1478 } | |
1479 _should_revert_to_full_young_gcs = false; | |
1480 | |
1481 if (_last_young_gc_full && !_during_marking) | |
1482 _young_gc_eff_seq->add(cur_efficiency); | |
1483 } | |
1484 | |
1485 _short_lived_surv_rate_group->start_adding_regions(); | |
1486 // do that for any other surv rate groupsx | |
1487 | |
1488 // <NEW PREDICTION> | |
1489 | |
677 | 1490 if (update_stats) { |
342 | 1491 double pause_time_ms = elapsed_ms; |
1492 | |
1493 size_t diff = 0; | |
1494 if (_max_pending_cards >= _pending_cards) | |
1495 diff = _max_pending_cards - _pending_cards; | |
1496 _pending_card_diff_seq->add((double) diff); | |
1497 | |
1498 double cost_per_card_ms = 0.0; | |
1499 if (_pending_cards > 0) { | |
1500 cost_per_card_ms = update_rs_time / (double) _pending_cards; | |
1501 _cost_per_card_ms_seq->add(cost_per_card_ms); | |
1502 } | |
1503 | |
1504 size_t cards_scanned = _g1->cards_scanned(); | |
1505 | |
1506 double cost_per_entry_ms = 0.0; | |
1507 if (cards_scanned > 10) { | |
1508 cost_per_entry_ms = scan_rs_time / (double) cards_scanned; | |
1509 if (_last_young_gc_full) | |
1510 _cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1511 else | |
1512 _partially_young_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1513 } | |
1514 | |
1515 if (_max_rs_lengths > 0) { | |
1516 double cards_per_entry_ratio = | |
1517 (double) cards_scanned / (double) _max_rs_lengths; | |
1518 if (_last_young_gc_full) | |
1519 _fully_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1520 else | |
1521 _partially_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1522 } | |
1523 | |
1524 size_t rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; | |
1525 if (rs_length_diff >= 0) | |
1526 _rs_length_diff_seq->add((double) rs_length_diff); | |
1527 | |
1528 size_t copied_bytes = surviving_bytes; | |
1529 double cost_per_byte_ms = 0.0; | |
1530 if (copied_bytes > 0) { | |
1531 cost_per_byte_ms = obj_copy_time / (double) copied_bytes; | |
1532 if (_in_marking_window) | |
1533 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); | |
1534 else | |
1535 _cost_per_byte_ms_seq->add(cost_per_byte_ms); | |
1536 } | |
1537 | |
1538 double all_other_time_ms = pause_time_ms - | |
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1539 (update_rs_time + scan_rs_time + obj_copy_time + |
342 | 1540 _mark_closure_time_ms + termination_time); |
1541 | |
1542 double young_other_time_ms = 0.0; | |
1543 if (_recorded_young_regions > 0) { | |
1544 young_other_time_ms = | |
1545 _recorded_young_cset_choice_time_ms + | |
1546 _recorded_young_free_cset_time_ms; | |
1547 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / | |
1548 (double) _recorded_young_regions); | |
1549 } | |
1550 double non_young_other_time_ms = 0.0; | |
1551 if (_recorded_non_young_regions > 0) { | |
1552 non_young_other_time_ms = | |
1553 _recorded_non_young_cset_choice_time_ms + | |
1554 _recorded_non_young_free_cset_time_ms; | |
1555 | |
1556 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
1557 (double) _recorded_non_young_regions); | |
1558 } | |
1559 | |
1560 double constant_other_time_ms = all_other_time_ms - | |
1561 (young_other_time_ms + non_young_other_time_ms); | |
1562 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
1563 | |
1564 double survival_ratio = 0.0; | |
1565 if (_bytes_in_collection_set_before_gc > 0) { | |
1566 survival_ratio = (double) bytes_in_to_space_during_gc() / | |
1567 (double) _bytes_in_collection_set_before_gc; | |
1568 } | |
1569 | |
1570 _pending_cards_seq->add((double) _pending_cards); | |
1571 _scanned_cards_seq->add((double) cards_scanned); | |
1572 _rs_lengths_seq->add((double) _max_rs_lengths); | |
1573 | |
1574 double expensive_region_limit_ms = | |
751 | 1575 (double) MaxGCPauseMillis - predict_constant_other_time_ms(); |
342 | 1576 if (expensive_region_limit_ms < 0.0) { |
1577 // this means that the other time was predicted to be longer than | |
1578 // than the max pause time | |
751 | 1579 expensive_region_limit_ms = (double) MaxGCPauseMillis; |
342 | 1580 } |
1581 _expensive_region_limit_ms = expensive_region_limit_ms; | |
1582 | |
1583 if (PREDICTIONS_VERBOSE) { | |
1584 gclog_or_tty->print_cr(""); | |
1585 gclog_or_tty->print_cr("PREDICTIONS %1.4lf %d " | |
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1586 "REGIONS %d %d %d " |
342 | 1587 "PENDING_CARDS %d %d " |
1588 "CARDS_SCANNED %d %d " | |
1589 "RS_LENGTHS %d %d " | |
1590 "RS_UPDATE %1.6lf %1.6lf RS_SCAN %1.6lf %1.6lf " | |
1591 "SURVIVAL_RATIO %1.6lf %1.6lf " | |
1592 "OBJECT_COPY %1.6lf %1.6lf OTHER_CONSTANT %1.6lf %1.6lf " | |
1593 "OTHER_YOUNG %1.6lf %1.6lf " | |
1594 "OTHER_NON_YOUNG %1.6lf %1.6lf " | |
1595 "VTIME_DIFF %1.6lf TERMINATION %1.6lf " | |
1596 "ELAPSED %1.6lf %1.6lf ", | |
1597 _cur_collection_start_sec, | |
1598 (!_last_young_gc_full) ? 2 : | |
1599 (last_pause_included_initial_mark) ? 1 : 0, | |
1600 _recorded_region_num, | |
1601 _recorded_young_regions, | |
1602 _recorded_non_young_regions, | |
1603 _predicted_pending_cards, _pending_cards, | |
1604 _predicted_cards_scanned, cards_scanned, | |
1605 _predicted_rs_lengths, _max_rs_lengths, | |
1606 _predicted_rs_update_time_ms, update_rs_time, | |
1607 _predicted_rs_scan_time_ms, scan_rs_time, | |
1608 _predicted_survival_ratio, survival_ratio, | |
1609 _predicted_object_copy_time_ms, obj_copy_time, | |
1610 _predicted_constant_other_time_ms, constant_other_time_ms, | |
1611 _predicted_young_other_time_ms, young_other_time_ms, | |
1612 _predicted_non_young_other_time_ms, | |
1613 non_young_other_time_ms, | |
1614 _vtime_diff_ms, termination_time, | |
1615 _predicted_pause_time_ms, elapsed_ms); | |
1616 } | |
1617 | |
1618 if (G1PolicyVerbose > 0) { | |
1619 gclog_or_tty->print_cr("Pause Time, predicted: %1.4lfms (predicted %s), actual: %1.4lfms", | |
1620 _predicted_pause_time_ms, | |
1621 (_within_target) ? "within" : "outside", | |
1622 elapsed_ms); | |
1623 } | |
1624 | |
1625 } | |
1626 | |
1627 _in_marking_window = new_in_marking_window; | |
1628 _in_marking_window_im = new_in_marking_window_im; | |
1629 _free_regions_at_end_of_collection = _g1->free_regions(); | |
1630 calculate_young_list_min_length(); | |
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1631 calculate_young_list_target_length(); |
342 | 1632 |
1111 | 1633 // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
1282 | 1634 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
1111 | 1635 adjust_concurrent_refinement(update_rs_time, update_rs_processed_buffers, update_rs_time_goal_ms); |
342 | 1636 // </NEW PREDICTION> |
1637 } | |
1638 | |
1639 // <NEW PREDICTION> | |
1640 | |
1111 | 1641 void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
1642 double update_rs_processed_buffers, | |
1643 double goal_ms) { | |
1644 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
1645 ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); | |
1646 | |
1282 | 1647 if (G1UseAdaptiveConcRefinement) { |
1111 | 1648 const int k_gy = 3, k_gr = 6; |
1649 const double inc_k = 1.1, dec_k = 0.9; | |
1650 | |
1651 int g = cg1r->green_zone(); | |
1652 if (update_rs_time > goal_ms) { | |
1653 g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. | |
1654 } else { | |
1655 if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { | |
1656 g = (int)MAX2(g * inc_k, g + 1.0); | |
1657 } | |
1658 } | |
1659 // Change the refinement threads params | |
1660 cg1r->set_green_zone(g); | |
1661 cg1r->set_yellow_zone(g * k_gy); | |
1662 cg1r->set_red_zone(g * k_gr); | |
1663 cg1r->reinitialize_threads(); | |
1664 | |
1665 int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); | |
1666 int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, | |
1667 cg1r->yellow_zone()); | |
1668 // Change the barrier params | |
1669 dcqs.set_process_completed_threshold(processing_threshold); | |
1670 dcqs.set_max_completed_queue(cg1r->red_zone()); | |
1671 } | |
1672 | |
1673 int curr_queue_size = dcqs.completed_buffers_num(); | |
1674 if (curr_queue_size >= cg1r->yellow_zone()) { | |
1675 dcqs.set_completed_queue_padding(curr_queue_size); | |
1676 } else { | |
1677 dcqs.set_completed_queue_padding(0); | |
1678 } | |
1679 dcqs.notify_if_necessary(); | |
1680 } | |
1681 | |
342 | 1682 double |
1683 G1CollectorPolicy:: | |
1684 predict_young_collection_elapsed_time_ms(size_t adjustment) { | |
1685 guarantee( adjustment == 0 || adjustment == 1, "invariant" ); | |
1686 | |
1687 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
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1688 size_t young_num = g1h->young_list()->length(); |
342 | 1689 if (young_num == 0) |
1690 return 0.0; | |
1691 | |
1692 young_num += adjustment; | |
1693 size_t pending_cards = predict_pending_cards(); | |
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1694 size_t rs_lengths = g1h->young_list()->sampled_rs_lengths() + |
342 | 1695 predict_rs_length_diff(); |
1696 size_t card_num; | |
1697 if (full_young_gcs()) | |
1698 card_num = predict_young_card_num(rs_lengths); | |
1699 else | |
1700 card_num = predict_non_young_card_num(rs_lengths); | |
1701 size_t young_byte_size = young_num * HeapRegion::GrainBytes; | |
1702 double accum_yg_surv_rate = | |
1703 _short_lived_surv_rate_group->accum_surv_rate(adjustment); | |
1704 | |
1705 size_t bytes_to_copy = | |
1706 (size_t) (accum_yg_surv_rate * (double) HeapRegion::GrainBytes); | |
1707 | |
1708 return | |
1709 predict_rs_update_time_ms(pending_cards) + | |
1710 predict_rs_scan_time_ms(card_num) + | |
1711 predict_object_copy_time_ms(bytes_to_copy) + | |
1712 predict_young_other_time_ms(young_num) + | |
1713 predict_constant_other_time_ms(); | |
1714 } | |
1715 | |
1716 double | |
1717 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { | |
1718 size_t rs_length = predict_rs_length_diff(); | |
1719 size_t card_num; | |
1720 if (full_young_gcs()) | |
1721 card_num = predict_young_card_num(rs_length); | |
1722 else | |
1723 card_num = predict_non_young_card_num(rs_length); | |
1724 return predict_base_elapsed_time_ms(pending_cards, card_num); | |
1725 } | |
1726 | |
1727 double | |
1728 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
1729 size_t scanned_cards) { | |
1730 return | |
1731 predict_rs_update_time_ms(pending_cards) + | |
1732 predict_rs_scan_time_ms(scanned_cards) + | |
1733 predict_constant_other_time_ms(); | |
1734 } | |
1735 | |
1736 double | |
1737 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
1738 bool young) { | |
1739 size_t rs_length = hr->rem_set()->occupied(); | |
1740 size_t card_num; | |
1741 if (full_young_gcs()) | |
1742 card_num = predict_young_card_num(rs_length); | |
1743 else | |
1744 card_num = predict_non_young_card_num(rs_length); | |
1745 size_t bytes_to_copy = predict_bytes_to_copy(hr); | |
1746 | |
1747 double region_elapsed_time_ms = | |
1748 predict_rs_scan_time_ms(card_num) + | |
1749 predict_object_copy_time_ms(bytes_to_copy); | |
1750 | |
1751 if (young) | |
1752 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
1753 else | |
1754 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
1755 | |
1756 return region_elapsed_time_ms; | |
1757 } | |
1758 | |
1759 size_t | |
1760 G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { | |
1761 size_t bytes_to_copy; | |
1762 if (hr->is_marked()) | |
1763 bytes_to_copy = hr->max_live_bytes(); | |
1764 else { | |
1765 guarantee( hr->is_young() && hr->age_in_surv_rate_group() != -1, | |
1766 "invariant" ); | |
1767 int age = hr->age_in_surv_rate_group(); | |
545 | 1768 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
342 | 1769 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
1770 } | |
1771 | |
1772 return bytes_to_copy; | |
1773 } | |
1774 | |
1775 void | |
1776 G1CollectorPolicy::start_recording_regions() { | |
1777 _recorded_rs_lengths = 0; | |
1778 _recorded_young_regions = 0; | |
1779 _recorded_non_young_regions = 0; | |
1780 | |
1781 #if PREDICTIONS_VERBOSE | |
1782 _recorded_marked_bytes = 0; | |
1783 _recorded_young_bytes = 0; | |
1784 _predicted_bytes_to_copy = 0; | |
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1785 _predicted_rs_lengths = 0; |
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1786 _predicted_cards_scanned = 0; |
342 | 1787 #endif // PREDICTIONS_VERBOSE |
1788 } | |
1789 | |
1790 void | |
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1791 G1CollectorPolicy::record_cset_region_info(HeapRegion* hr, bool young) { |
342 | 1792 #if PREDICTIONS_VERBOSE |
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1793 if (!young) { |
342 | 1794 _recorded_marked_bytes += hr->max_live_bytes(); |
1795 } | |
1796 _predicted_bytes_to_copy += predict_bytes_to_copy(hr); | |
1797 #endif // PREDICTIONS_VERBOSE | |
1798 | |
1799 size_t rs_length = hr->rem_set()->occupied(); | |
1800 _recorded_rs_lengths += rs_length; | |
1801 } | |
1802 | |
1803 void | |
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1804 G1CollectorPolicy::record_non_young_cset_region(HeapRegion* hr) { |
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1805 assert(!hr->is_young(), "should not call this"); |
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1806 ++_recorded_non_young_regions; |
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1807 record_cset_region_info(hr, false); |
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1808 } |
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1809 |
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1810 void |
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1811 G1CollectorPolicy::set_recorded_young_regions(size_t n_regions) { |
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1812 _recorded_young_regions = n_regions; |
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1813 } |
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1814 |
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1815 void G1CollectorPolicy::set_recorded_young_bytes(size_t bytes) { |
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1816 #if PREDICTIONS_VERBOSE |
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1817 _recorded_young_bytes = bytes; |
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1818 #endif // PREDICTIONS_VERBOSE |
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1819 } |
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1820 |
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1821 void G1CollectorPolicy::set_recorded_rs_lengths(size_t rs_lengths) { |
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1822 _recorded_rs_lengths = rs_lengths; |
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1823 } |
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1824 |
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1825 void G1CollectorPolicy::set_predicted_bytes_to_copy(size_t bytes) { |
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1826 _predicted_bytes_to_copy = bytes; |
342 | 1827 } |
1828 | |
1829 void | |
1830 G1CollectorPolicy::end_recording_regions() { | |
1394
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1831 // The _predicted_pause_time_ms field is referenced in code |
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1832 // not under PREDICTIONS_VERBOSE. Let's initialize it. |
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1833 _predicted_pause_time_ms = -1.0; |
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1834 |
342 | 1835 #if PREDICTIONS_VERBOSE |
1836 _predicted_pending_cards = predict_pending_cards(); | |
1837 _predicted_rs_lengths = _recorded_rs_lengths + predict_rs_length_diff(); | |
1838 if (full_young_gcs()) | |
1839 _predicted_cards_scanned += predict_young_card_num(_predicted_rs_lengths); | |
1840 else | |
1841 _predicted_cards_scanned += | |
1842 predict_non_young_card_num(_predicted_rs_lengths); | |
1843 _recorded_region_num = _recorded_young_regions + _recorded_non_young_regions; | |
1844 | |
1845 _predicted_rs_update_time_ms = | |
1846 predict_rs_update_time_ms(_g1->pending_card_num()); | |
1847 _predicted_rs_scan_time_ms = | |
1848 predict_rs_scan_time_ms(_predicted_cards_scanned); | |
1849 _predicted_object_copy_time_ms = | |
1850 predict_object_copy_time_ms(_predicted_bytes_to_copy); | |
1851 _predicted_constant_other_time_ms = | |
1852 predict_constant_other_time_ms(); | |
1853 _predicted_young_other_time_ms = | |
1854 predict_young_other_time_ms(_recorded_young_regions); | |
1855 _predicted_non_young_other_time_ms = | |
1856 predict_non_young_other_time_ms(_recorded_non_young_regions); | |
1857 | |
1858 _predicted_pause_time_ms = | |
1859 _predicted_rs_update_time_ms + | |
1860 _predicted_rs_scan_time_ms + | |
1861 _predicted_object_copy_time_ms + | |
1862 _predicted_constant_other_time_ms + | |
1863 _predicted_young_other_time_ms + | |
1864 _predicted_non_young_other_time_ms; | |
1865 #endif // PREDICTIONS_VERBOSE | |
1866 } | |
1867 | |
1868 void G1CollectorPolicy::check_if_region_is_too_expensive(double | |
1869 predicted_time_ms) { | |
1870 // I don't think we need to do this when in young GC mode since | |
1871 // marking will be initiated next time we hit the soft limit anyway... | |
1872 if (predicted_time_ms > _expensive_region_limit_ms) { | |
1873 if (!in_young_gc_mode()) { | |
1874 set_full_young_gcs(true); | |
1359
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1875 // We might want to do something different here. However, |
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1876 // right now we don't support the non-generational G1 mode |
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1877 // (and in fact we are planning to remove the associated code, |
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1878 // see CR 6814390). So, let's leave it as is and this will be |
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1879 // removed some time in the future |
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1880 ShouldNotReachHere(); |
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1881 set_during_initial_mark_pause(); |
342 | 1882 } else |
1883 // no point in doing another partial one | |
1884 _should_revert_to_full_young_gcs = true; | |
1885 } | |
1886 } | |
1887 | |
1888 // </NEW PREDICTION> | |
1889 | |
1890 | |
1891 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, | |
1892 double elapsed_ms) { | |
1893 _recent_gc_times_ms->add(elapsed_ms); | |
1894 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
1895 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
1896 } | |
1897 | |
1898 double G1CollectorPolicy::recent_avg_time_for_pauses_ms() { | |
751 | 1899 if (_recent_pause_times_ms->num() == 0) return (double) MaxGCPauseMillis; |
342 | 1900 else return _recent_pause_times_ms->avg(); |
1901 } | |
1902 | |
1903 double G1CollectorPolicy::recent_avg_time_for_CH_strong_ms() { | |
1904 if (_recent_CH_strong_roots_times_ms->num() == 0) | |
751 | 1905 return (double)MaxGCPauseMillis/3.0; |
342 | 1906 else return _recent_CH_strong_roots_times_ms->avg(); |
1907 } | |
1908 | |
1909 double G1CollectorPolicy::recent_avg_time_for_G1_strong_ms() { | |
1910 if (_recent_G1_strong_roots_times_ms->num() == 0) | |
751 | 1911 return (double)MaxGCPauseMillis/3.0; |
342 | 1912 else return _recent_G1_strong_roots_times_ms->avg(); |
1913 } | |
1914 | |
1915 double G1CollectorPolicy::recent_avg_time_for_evac_ms() { | |
751 | 1916 if (_recent_evac_times_ms->num() == 0) return (double)MaxGCPauseMillis/3.0; |
342 | 1917 else return _recent_evac_times_ms->avg(); |
1918 } | |
1919 | |
1920 int G1CollectorPolicy::number_of_recent_gcs() { | |
1921 assert(_recent_CH_strong_roots_times_ms->num() == | |
1922 _recent_G1_strong_roots_times_ms->num(), "Sequence out of sync"); | |
1923 assert(_recent_G1_strong_roots_times_ms->num() == | |
1924 _recent_evac_times_ms->num(), "Sequence out of sync"); | |
1925 assert(_recent_evac_times_ms->num() == | |
1926 _recent_pause_times_ms->num(), "Sequence out of sync"); | |
1927 assert(_recent_pause_times_ms->num() == | |
1928 _recent_CS_bytes_used_before->num(), "Sequence out of sync"); | |
1929 assert(_recent_CS_bytes_used_before->num() == | |
1930 _recent_CS_bytes_surviving->num(), "Sequence out of sync"); | |
1931 return _recent_pause_times_ms->num(); | |
1932 } | |
1933 | |
1934 double G1CollectorPolicy::recent_avg_survival_fraction() { | |
1935 return recent_avg_survival_fraction_work(_recent_CS_bytes_surviving, | |
1936 _recent_CS_bytes_used_before); | |
1937 } | |
1938 | |
1939 double G1CollectorPolicy::last_survival_fraction() { | |
1940 return last_survival_fraction_work(_recent_CS_bytes_surviving, | |
1941 _recent_CS_bytes_used_before); | |
1942 } | |
1943 | |
1944 double | |
1945 G1CollectorPolicy::recent_avg_survival_fraction_work(TruncatedSeq* surviving, | |
1946 TruncatedSeq* before) { | |
1947 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
1948 if (before->sum() > 0.0) { | |
1949 double recent_survival_rate = surviving->sum() / before->sum(); | |
1950 // We exempt parallel collection from this check because Alloc Buffer | |
1951 // fragmentation can produce negative collections. | |
1952 // Further, we're now always doing parallel collection. But I'm still | |
1953 // leaving this here as a placeholder for a more precise assertion later. | |
1954 // (DLD, 10/05.) | |
1955 assert((true || ParallelGCThreads > 0) || | |
1956 _g1->evacuation_failed() || | |
1957 recent_survival_rate <= 1.0, "Or bad frac"); | |
1958 return recent_survival_rate; | |
1959 } else { | |
1960 return 1.0; // Be conservative. | |
1961 } | |
1962 } | |
1963 | |
1964 double | |
1965 G1CollectorPolicy::last_survival_fraction_work(TruncatedSeq* surviving, | |
1966 TruncatedSeq* before) { | |
1967 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
1968 if (surviving->num() > 0 && before->last() > 0.0) { | |
1969 double last_survival_rate = surviving->last() / before->last(); | |
1970 // We exempt parallel collection from this check because Alloc Buffer | |
1971 // fragmentation can produce negative collections. | |
1972 // Further, we're now always doing parallel collection. But I'm still | |
1973 // leaving this here as a placeholder for a more precise assertion later. | |
1974 // (DLD, 10/05.) | |
1975 assert((true || ParallelGCThreads > 0) || | |
1976 last_survival_rate <= 1.0, "Or bad frac"); | |
1977 return last_survival_rate; | |
1978 } else { | |
1979 return 1.0; | |
1980 } | |
1981 } | |
1982 | |
1983 static const int survival_min_obs = 5; | |
1984 static double survival_min_obs_limits[] = { 0.9, 0.7, 0.5, 0.3, 0.1 }; | |
1985 static const double min_survival_rate = 0.1; | |
1986 | |
1987 double | |
1988 G1CollectorPolicy::conservative_avg_survival_fraction_work(double avg, | |
1989 double latest) { | |
1990 double res = avg; | |
1991 if (number_of_recent_gcs() < survival_min_obs) { | |
1992 res = MAX2(res, survival_min_obs_limits[number_of_recent_gcs()]); | |
1993 } | |
1994 res = MAX2(res, latest); | |
1995 res = MAX2(res, min_survival_rate); | |
1996 // In the parallel case, LAB fragmentation can produce "negative | |
1997 // collections"; so can evac failure. Cap at 1.0 | |
1998 res = MIN2(res, 1.0); | |
1999 return res; | |
2000 } | |
2001 | |
2002 size_t G1CollectorPolicy::expansion_amount() { | |
1356 | 2003 if ((recent_avg_pause_time_ratio() * 100.0) > _gc_overhead_perc) { |
751 | 2004 // We will double the existing space, or take |
2005 // G1ExpandByPercentOfAvailable % of the available expansion | |
2006 // space, whichever is smaller, bounded below by a minimum | |
2007 // expansion (unless that's all that's left.) | |
342 | 2008 const size_t min_expand_bytes = 1*M; |
2009 size_t reserved_bytes = _g1->g1_reserved_obj_bytes(); | |
2010 size_t committed_bytes = _g1->capacity(); | |
2011 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
2012 size_t expand_bytes; | |
2013 size_t expand_bytes_via_pct = | |
751 | 2014 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
342 | 2015 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
2016 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
2017 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
2018 if (G1PolicyVerbose > 1) { | |
2019 gclog_or_tty->print("Decided to expand: ratio = %5.2f, " | |
2020 "committed = %d%s, uncommited = %d%s, via pct = %d%s.\n" | |
2021 " Answer = %d.\n", | |
2022 recent_avg_pause_time_ratio(), | |
2023 byte_size_in_proper_unit(committed_bytes), | |
2024 proper_unit_for_byte_size(committed_bytes), | |
2025 byte_size_in_proper_unit(uncommitted_bytes), | |
2026 proper_unit_for_byte_size(uncommitted_bytes), | |
2027 byte_size_in_proper_unit(expand_bytes_via_pct), | |
2028 proper_unit_for_byte_size(expand_bytes_via_pct), | |
2029 byte_size_in_proper_unit(expand_bytes), | |
2030 proper_unit_for_byte_size(expand_bytes)); | |
2031 } | |
2032 return expand_bytes; | |
2033 } else { | |
2034 return 0; | |
2035 } | |
2036 } | |
2037 | |
2038 void G1CollectorPolicy::note_start_of_mark_thread() { | |
2039 _mark_thread_startup_sec = os::elapsedTime(); | |
2040 } | |
2041 | |
2042 class CountCSClosure: public HeapRegionClosure { | |
2043 G1CollectorPolicy* _g1_policy; | |
2044 public: | |
2045 CountCSClosure(G1CollectorPolicy* g1_policy) : | |
2046 _g1_policy(g1_policy) {} | |
2047 bool doHeapRegion(HeapRegion* r) { | |
2048 _g1_policy->_bytes_in_collection_set_before_gc += r->used(); | |
2049 return false; | |
2050 } | |
2051 }; | |
2052 | |
2053 void G1CollectorPolicy::count_CS_bytes_used() { | |
2054 CountCSClosure cs_closure(this); | |
2055 _g1->collection_set_iterate(&cs_closure); | |
2056 } | |
2057 | |
2058 static void print_indent(int level) { | |
2059 for (int j = 0; j < level+1; ++j) | |
2060 gclog_or_tty->print(" "); | |
2061 } | |
2062 | |
2063 void G1CollectorPolicy::print_summary (int level, | |
2064 const char* str, | |
2065 NumberSeq* seq) const { | |
2066 double sum = seq->sum(); | |
2067 print_indent(level); | |
2068 gclog_or_tty->print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", | |
2069 str, sum / 1000.0, seq->avg()); | |
2070 } | |
2071 | |
2072 void G1CollectorPolicy::print_summary_sd (int level, | |
2073 const char* str, | |
2074 NumberSeq* seq) const { | |
2075 print_summary(level, str, seq); | |
2076 print_indent(level + 5); | |
2077 gclog_or_tty->print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", | |
2078 seq->num(), seq->sd(), seq->maximum()); | |
2079 } | |
2080 | |
2081 void G1CollectorPolicy::check_other_times(int level, | |
2082 NumberSeq* other_times_ms, | |
2083 NumberSeq* calc_other_times_ms) const { | |
2084 bool should_print = false; | |
2085 | |
2086 double max_sum = MAX2(fabs(other_times_ms->sum()), | |
2087 fabs(calc_other_times_ms->sum())); | |
2088 double min_sum = MIN2(fabs(other_times_ms->sum()), | |
2089 fabs(calc_other_times_ms->sum())); | |
2090 double sum_ratio = max_sum / min_sum; | |
2091 if (sum_ratio > 1.1) { | |
2092 should_print = true; | |
2093 print_indent(level + 1); | |
2094 gclog_or_tty->print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); | |
2095 } | |
2096 | |
2097 double max_avg = MAX2(fabs(other_times_ms->avg()), | |
2098 fabs(calc_other_times_ms->avg())); | |
2099 double min_avg = MIN2(fabs(other_times_ms->avg()), | |
2100 fabs(calc_other_times_ms->avg())); | |
2101 double avg_ratio = max_avg / min_avg; | |
2102 if (avg_ratio > 1.1) { | |
2103 should_print = true; | |
2104 print_indent(level + 1); | |
2105 gclog_or_tty->print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); | |
2106 } | |
2107 | |
2108 if (other_times_ms->sum() < -0.01) { | |
2109 print_indent(level + 1); | |
2110 gclog_or_tty->print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); | |
2111 } | |
2112 | |
2113 if (other_times_ms->avg() < -0.01) { | |
2114 print_indent(level + 1); | |
2115 gclog_or_tty->print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); | |
2116 } | |
2117 | |
2118 if (calc_other_times_ms->sum() < -0.01) { | |
2119 should_print = true; | |
2120 print_indent(level + 1); | |
2121 gclog_or_tty->print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); | |
2122 } | |
2123 | |
2124 if (calc_other_times_ms->avg() < -0.01) { | |
2125 should_print = true; | |
2126 print_indent(level + 1); | |
2127 gclog_or_tty->print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); | |
2128 } | |
2129 | |
2130 if (should_print) | |
2131 print_summary(level, "Other(Calc)", calc_other_times_ms); | |
2132 } | |
2133 | |
2134 void G1CollectorPolicy::print_summary(PauseSummary* summary) const { | |
2135 bool parallel = ParallelGCThreads > 0; | |
2136 MainBodySummary* body_summary = summary->main_body_summary(); | |
2137 if (summary->get_total_seq()->num() > 0) { | |
677 | 2138 print_summary_sd(0, "Evacuation Pauses", summary->get_total_seq()); |
342 | 2139 if (body_summary != NULL) { |
2140 print_summary(1, "SATB Drain", body_summary->get_satb_drain_seq()); | |
2141 if (parallel) { | |
2142 print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); | |
2143 print_summary(2, "Update RS", body_summary->get_update_rs_seq()); | |
2144 print_summary(2, "Ext Root Scanning", | |
2145 body_summary->get_ext_root_scan_seq()); | |
2146 print_summary(2, "Mark Stack Scanning", | |
2147 body_summary->get_mark_stack_scan_seq()); | |
2148 print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); | |
2149 print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); | |
2150 print_summary(2, "Termination", body_summary->get_termination_seq()); | |
2151 print_summary(2, "Other", body_summary->get_parallel_other_seq()); | |
2152 { | |
2153 NumberSeq* other_parts[] = { | |
2154 body_summary->get_update_rs_seq(), | |
2155 body_summary->get_ext_root_scan_seq(), | |
2156 body_summary->get_mark_stack_scan_seq(), | |
2157 body_summary->get_scan_rs_seq(), | |
2158 body_summary->get_obj_copy_seq(), | |
2159 body_summary->get_termination_seq() | |
2160 }; | |
2161 NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), | |
2162 7, other_parts); | |
2163 check_other_times(2, body_summary->get_parallel_other_seq(), | |
2164 &calc_other_times_ms); | |
2165 } | |
2166 print_summary(1, "Mark Closure", body_summary->get_mark_closure_seq()); | |
2167 print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); | |
2168 } else { | |
2169 print_summary(1, "Update RS", body_summary->get_update_rs_seq()); | |
2170 print_summary(1, "Ext Root Scanning", | |
2171 body_summary->get_ext_root_scan_seq()); | |
2172 print_summary(1, "Mark Stack Scanning", | |
2173 body_summary->get_mark_stack_scan_seq()); | |
2174 print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); | |
2175 print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); | |
2176 } | |
2177 } | |
2178 print_summary(1, "Other", summary->get_other_seq()); | |
2179 { | |
2180 NumberSeq calc_other_times_ms; | |
2181 if (body_summary != NULL) { | |
2182 // not abandoned | |
2183 if (parallel) { | |
2184 // parallel | |
2185 NumberSeq* other_parts[] = { | |
2186 body_summary->get_satb_drain_seq(), | |
2187 body_summary->get_parallel_seq(), | |
2188 body_summary->get_clear_ct_seq() | |
2189 }; | |
677 | 2190 calc_other_times_ms = NumberSeq(summary->get_total_seq(), |
2191 3, other_parts); | |
342 | 2192 } else { |
2193 // serial | |
2194 NumberSeq* other_parts[] = { | |
2195 body_summary->get_satb_drain_seq(), | |
2196 body_summary->get_update_rs_seq(), | |
2197 body_summary->get_ext_root_scan_seq(), | |
2198 body_summary->get_mark_stack_scan_seq(), | |
2199 body_summary->get_scan_rs_seq(), | |
2200 body_summary->get_obj_copy_seq() | |
2201 }; | |
2202 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
677 | 2203 7, other_parts); |
342 | 2204 } |
2205 } else { | |
2206 // abandoned | |
677 | 2207 calc_other_times_ms = NumberSeq(); |
342 | 2208 } |
2209 check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); | |
2210 } | |
2211 } else { | |
2212 print_indent(0); | |
2213 gclog_or_tty->print_cr("none"); | |
2214 } | |
2215 gclog_or_tty->print_cr(""); | |
2216 } | |
2217 | |
2218 void | |
677 | 2219 G1CollectorPolicy::print_abandoned_summary(PauseSummary* summary) const { |
342 | 2220 bool printed = false; |
677 | 2221 if (summary->get_total_seq()->num() > 0) { |
342 | 2222 printed = true; |
677 | 2223 print_summary(summary); |
342 | 2224 } |
2225 if (!printed) { | |
2226 print_indent(0); | |
2227 gclog_or_tty->print_cr("none"); | |
2228 gclog_or_tty->print_cr(""); | |
2229 } | |
2230 } | |
2231 | |
2232 void G1CollectorPolicy::print_tracing_info() const { | |
2233 if (TraceGen0Time) { | |
2234 gclog_or_tty->print_cr("ALL PAUSES"); | |
2235 print_summary_sd(0, "Total", _all_pause_times_ms); | |
2236 gclog_or_tty->print_cr(""); | |
2237 gclog_or_tty->print_cr(""); | |
2238 gclog_or_tty->print_cr(" Full Young GC Pauses: %8d", _full_young_pause_num); | |
2239 gclog_or_tty->print_cr(" Partial Young GC Pauses: %8d", _partial_young_pause_num); | |
2240 gclog_or_tty->print_cr(""); | |
2241 | |
677 | 2242 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
2243 print_summary(_summary); | |
342 | 2244 |
2245 gclog_or_tty->print_cr("ABANDONED PAUSES"); | |
677 | 2246 print_abandoned_summary(_abandoned_summary); |
342 | 2247 |
2248 gclog_or_tty->print_cr("MISC"); | |
2249 print_summary_sd(0, "Stop World", _all_stop_world_times_ms); | |
2250 print_summary_sd(0, "Yields", _all_yield_times_ms); | |
2251 for (int i = 0; i < _aux_num; ++i) { | |
2252 if (_all_aux_times_ms[i].num() > 0) { | |
2253 char buffer[96]; | |
2254 sprintf(buffer, "Aux%d", i); | |
2255 print_summary_sd(0, buffer, &_all_aux_times_ms[i]); | |
2256 } | |
2257 } | |
2258 | |
2259 size_t all_region_num = _region_num_young + _region_num_tenured; | |
2260 gclog_or_tty->print_cr(" New Regions %8d, Young %8d (%6.2lf%%), " | |
2261 "Tenured %8d (%6.2lf%%)", | |
2262 all_region_num, | |
2263 _region_num_young, | |
2264 (double) _region_num_young / (double) all_region_num * 100.0, | |
2265 _region_num_tenured, | |
2266 (double) _region_num_tenured / (double) all_region_num * 100.0); | |
2267 } | |
2268 if (TraceGen1Time) { | |
2269 if (_all_full_gc_times_ms->num() > 0) { | |
2270 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", | |
2271 _all_full_gc_times_ms->num(), | |
2272 _all_full_gc_times_ms->sum() / 1000.0); | |
2273 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); | |
2274 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", | |
2275 _all_full_gc_times_ms->sd(), | |
2276 _all_full_gc_times_ms->maximum()); | |
2277 } | |
2278 } | |
2279 } | |
2280 | |
2281 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
2282 #ifndef PRODUCT | |
2283 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
2284 // add this call for any other surv rate groups | |
2285 #endif // PRODUCT | |
2286 } | |
2287 | |
2288 bool | |
2289 G1CollectorPolicy::should_add_next_region_to_young_list() { | |
2290 assert(in_young_gc_mode(), "should be in young GC mode"); | |
2291 bool ret; | |
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2292 size_t young_list_length = _g1->young_list()->length(); |
545 | 2293 size_t young_list_max_length = _young_list_target_length; |
2294 if (G1FixedEdenSize) { | |
2295 young_list_max_length -= _max_survivor_regions; | |
2296 } | |
2297 if (young_list_length < young_list_max_length) { | |
342 | 2298 ret = true; |
2299 ++_region_num_young; | |
2300 } else { | |
2301 ret = false; | |
2302 ++_region_num_tenured; | |
2303 } | |
2304 | |
2305 return ret; | |
2306 } | |
2307 | |
2308 #ifndef PRODUCT | |
2309 // for debugging, bit of a hack... | |
2310 static char* | |
2311 region_num_to_mbs(int length) { | |
2312 static char buffer[64]; | |
2313 double bytes = (double) (length * HeapRegion::GrainBytes); | |
2314 double mbs = bytes / (double) (1024 * 1024); | |
2315 sprintf(buffer, "%7.2lfMB", mbs); | |
2316 return buffer; | |
2317 } | |
2318 #endif // PRODUCT | |
2319 | |
545 | 2320 size_t G1CollectorPolicy::max_regions(int purpose) { |
342 | 2321 switch (purpose) { |
2322 case GCAllocForSurvived: | |
545 | 2323 return _max_survivor_regions; |
342 | 2324 case GCAllocForTenured: |
545 | 2325 return REGIONS_UNLIMITED; |
342 | 2326 default: |
545 | 2327 ShouldNotReachHere(); |
2328 return REGIONS_UNLIMITED; | |
342 | 2329 }; |
2330 } | |
2331 | |
545 | 2332 // Calculates survivor space parameters. |
2333 void G1CollectorPolicy::calculate_survivors_policy() | |
2334 { | |
2335 if (G1FixedSurvivorSpaceSize == 0) { | |
2336 _max_survivor_regions = _young_list_target_length / SurvivorRatio; | |
2337 } else { | |
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2338 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
545 | 2339 } |
2340 | |
2341 if (G1FixedTenuringThreshold) { | |
2342 _tenuring_threshold = MaxTenuringThreshold; | |
2343 } else { | |
2344 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( | |
2345 HeapRegion::GrainWords * _max_survivor_regions); | |
2346 } | |
2347 } | |
2348 | |
342 | 2349 bool |
2350 G1CollectorPolicy_BestRegionsFirst::should_do_collection_pause(size_t | |
2351 word_size) { | |
2352 assert(_g1->regions_accounted_for(), "Region leakage!"); | |
2353 double max_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; | |
2354 | |
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2355 size_t young_list_length = _g1->young_list()->length(); |
545 | 2356 size_t young_list_max_length = _young_list_target_length; |
2357 if (G1FixedEdenSize) { | |
2358 young_list_max_length -= _max_survivor_regions; | |
2359 } | |
2360 bool reached_target_length = young_list_length >= young_list_max_length; | |
342 | 2361 |
2362 if (in_young_gc_mode()) { | |
2363 if (reached_target_length) { | |
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2364 assert( young_list_length > 0 && _g1->young_list()->length() > 0, |
342 | 2365 "invariant" ); |
2366 return true; | |
2367 } | |
2368 } else { | |
2369 guarantee( false, "should not reach here" ); | |
2370 } | |
2371 | |
2372 return false; | |
2373 } | |
2374 | |
2375 #ifndef PRODUCT | |
2376 class HRSortIndexIsOKClosure: public HeapRegionClosure { | |
2377 CollectionSetChooser* _chooser; | |
2378 public: | |
2379 HRSortIndexIsOKClosure(CollectionSetChooser* chooser) : | |
2380 _chooser(chooser) {} | |
2381 | |
2382 bool doHeapRegion(HeapRegion* r) { | |
2383 if (!r->continuesHumongous()) { | |
2384 assert(_chooser->regionProperlyOrdered(r), "Ought to be."); | |
2385 } | |
2386 return false; | |
2387 } | |
2388 }; | |
2389 | |
2390 bool G1CollectorPolicy_BestRegionsFirst::assertMarkedBytesDataOK() { | |
2391 HRSortIndexIsOKClosure cl(_collectionSetChooser); | |
2392 _g1->heap_region_iterate(&cl); | |
2393 return true; | |
2394 } | |
2395 #endif | |
2396 | |
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2397 bool |
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2398 G1CollectorPolicy::force_initial_mark_if_outside_cycle() { |
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2399 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2400 if (!during_cycle) { |
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2401 set_initiate_conc_mark_if_possible(); |
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2402 return true; |
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2403 } else { |
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2404 return false; |
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2405 } |
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2406 } |
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2407 |
342 | 2408 void |
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2409 G1CollectorPolicy::decide_on_conc_mark_initiation() { |
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2410 // We are about to decide on whether this pause will be an |
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2411 // initial-mark pause. |
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2412 |
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2413 // First, during_initial_mark_pause() should not be already set. We |
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2414 // will set it here if we have to. However, it should be cleared by |
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2415 // the end of the pause (it's only set for the duration of an |
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2416 // initial-mark pause). |
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2417 assert(!during_initial_mark_pause(), "pre-condition"); |
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2418 |
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2419 if (initiate_conc_mark_if_possible()) { |
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2420 // We had noticed on a previous pause that the heap occupancy has |
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2421 // gone over the initiating threshold and we should start a |
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2422 // concurrent marking cycle. So we might initiate one. |
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2423 |
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2424 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2425 if (!during_cycle) { |
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2426 // The concurrent marking thread is not "during a cycle", i.e., |
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2427 // it has completed the last one. So we can go ahead and |
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2428 // initiate a new cycle. |
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2429 |
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2430 set_during_initial_mark_pause(); |
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2431 |
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2432 // And we can now clear initiate_conc_mark_if_possible() as |
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2433 // we've already acted on it. |
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2434 clear_initiate_conc_mark_if_possible(); |
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2435 } else { |
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2436 // The concurrent marking thread is still finishing up the |
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2437 // previous cycle. If we start one right now the two cycles |
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2438 // overlap. In particular, the concurrent marking thread might |
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2439 // be in the process of clearing the next marking bitmap (which |
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2440 // we will use for the next cycle if we start one). Starting a |
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2441 // cycle now will be bad given that parts of the marking |
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2442 // information might get cleared by the marking thread. And we |
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2443 // cannot wait for the marking thread to finish the cycle as it |
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2444 // periodically yields while clearing the next marking bitmap |
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2445 // and, if it's in a yield point, it's waiting for us to |
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2446 // finish. So, at this point we will not start a cycle and we'll |
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2447 // let the concurrent marking thread complete the last one. |
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2448 } |
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2449 } |
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2450 } |
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2451 |
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2452 void |
342 | 2453 G1CollectorPolicy_BestRegionsFirst:: |
2454 record_collection_pause_start(double start_time_sec, size_t start_used) { | |
2455 G1CollectorPolicy::record_collection_pause_start(start_time_sec, start_used); | |
2456 } | |
2457 | |
2458 class NextNonCSElemFinder: public HeapRegionClosure { | |
2459 HeapRegion* _res; | |
2460 public: | |
2461 NextNonCSElemFinder(): _res(NULL) {} | |
2462 bool doHeapRegion(HeapRegion* r) { | |
2463 if (!r->in_collection_set()) { | |
2464 _res = r; | |
2465 return true; | |
2466 } else { | |
2467 return false; | |
2468 } | |
2469 } | |
2470 HeapRegion* res() { return _res; } | |
2471 }; | |
2472 | |
2473 class KnownGarbageClosure: public HeapRegionClosure { | |
2474 CollectionSetChooser* _hrSorted; | |
2475 | |
2476 public: | |
2477 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
2478 _hrSorted(hrSorted) | |
2479 {} | |
2480 | |
2481 bool doHeapRegion(HeapRegion* r) { | |
2482 // We only include humongous regions in collection | |
2483 // sets when concurrent mark shows that their contained object is | |
2484 // unreachable. | |
2485 | |
2486 // Do we have any marking information for this region? | |
2487 if (r->is_marked()) { | |
2488 // We don't include humongous regions in collection | |
2489 // sets because we collect them immediately at the end of a marking | |
2490 // cycle. We also don't include young regions because we *must* | |
2491 // include them in the next collection pause. | |
2492 if (!r->isHumongous() && !r->is_young()) { | |
2493 _hrSorted->addMarkedHeapRegion(r); | |
2494 } | |
2495 } | |
2496 return false; | |
2497 } | |
2498 }; | |
2499 | |
2500 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
2501 CollectionSetChooser* _hrSorted; | |
2502 jint _marked_regions_added; | |
2503 jint _chunk_size; | |
2504 jint _cur_chunk_idx; | |
2505 jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) | |
2506 int _worker; | |
2507 int _invokes; | |
2508 | |
2509 void get_new_chunk() { | |
2510 _cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size); | |
2511 _cur_chunk_end = _cur_chunk_idx + _chunk_size; | |
2512 } | |
2513 void add_region(HeapRegion* r) { | |
2514 if (_cur_chunk_idx == _cur_chunk_end) { | |
2515 get_new_chunk(); | |
2516 } | |
2517 assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); | |
2518 _hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r); | |
2519 _marked_regions_added++; | |
2520 _cur_chunk_idx++; | |
2521 } | |
2522 | |
2523 public: | |
2524 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
2525 jint chunk_size, | |
2526 int worker) : | |
2527 _hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker), | |
2528 _marked_regions_added(0), _cur_chunk_idx(0), _cur_chunk_end(0), | |
2529 _invokes(0) | |
2530 {} | |
2531 | |
2532 bool doHeapRegion(HeapRegion* r) { | |
2533 // We only include humongous regions in collection | |
2534 // sets when concurrent mark shows that their contained object is | |
2535 // unreachable. | |
2536 _invokes++; | |
2537 | |
2538 // Do we have any marking information for this region? | |
2539 if (r->is_marked()) { | |
2540 // We don't include humongous regions in collection | |
2541 // sets because we collect them immediately at the end of a marking | |
2542 // cycle. | |
2543 // We also do not include young regions in collection sets | |
2544 if (!r->isHumongous() && !r->is_young()) { | |
2545 add_region(r); | |
2546 } | |
2547 } | |
2548 return false; | |
2549 } | |
2550 jint marked_regions_added() { return _marked_regions_added; } | |
2551 int invokes() { return _invokes; } | |
2552 }; | |
2553 | |
2554 class ParKnownGarbageTask: public AbstractGangTask { | |
2555 CollectionSetChooser* _hrSorted; | |
2556 jint _chunk_size; | |
2557 G1CollectedHeap* _g1; | |
2558 public: | |
2559 ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) : | |
2560 AbstractGangTask("ParKnownGarbageTask"), | |
2561 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
2562 _g1(G1CollectedHeap::heap()) | |
2563 {} | |
2564 | |
2565 void work(int i) { | |
2566 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size, i); | |
2567 // Back to zero for the claim value. | |
355 | 2568 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, i, |
2569 HeapRegion::InitialClaimValue); | |
342 | 2570 jint regions_added = parKnownGarbageCl.marked_regions_added(); |
2571 _hrSorted->incNumMarkedHeapRegions(regions_added); | |
2572 if (G1PrintParCleanupStats) { | |
2573 gclog_or_tty->print(" Thread %d called %d times, added %d regions to list.\n", | |
2574 i, parKnownGarbageCl.invokes(), regions_added); | |
2575 } | |
2576 } | |
2577 }; | |
2578 | |
2579 void | |
2580 G1CollectorPolicy_BestRegionsFirst:: | |
2581 record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
2582 size_t max_live_bytes) { | |
2583 double start; | |
2584 if (G1PrintParCleanupStats) start = os::elapsedTime(); | |
2585 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
2586 | |
2587 _collectionSetChooser->clearMarkedHeapRegions(); | |
2588 double clear_marked_end; | |
2589 if (G1PrintParCleanupStats) { | |
2590 clear_marked_end = os::elapsedTime(); | |
2591 gclog_or_tty->print_cr(" clear marked regions + work1: %8.3f ms.", | |
2592 (clear_marked_end - start)*1000.0); | |
2593 } | |
2594 if (ParallelGCThreads > 0) { | |
2595 const size_t OverpartitionFactor = 4; | |
1571
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2596 const size_t MinWorkUnit = 8; |
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2597 const size_t WorkUnit = |
342 | 2598 MAX2(_g1->n_regions() / (ParallelGCThreads * OverpartitionFactor), |
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2599 MinWorkUnit); |
342 | 2600 _collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(), |
1571
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2601 WorkUnit); |
342 | 2602 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
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2603 (int) WorkUnit); |
342 | 2604 _g1->workers()->run_task(&parKnownGarbageTask); |
355 | 2605 |
2606 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2607 "sanity check"); | |
342 | 2608 } else { |
2609 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
2610 _g1->heap_region_iterate(&knownGarbagecl); | |
2611 } | |
2612 double known_garbage_end; | |
2613 if (G1PrintParCleanupStats) { | |
2614 known_garbage_end = os::elapsedTime(); | |
2615 gclog_or_tty->print_cr(" compute known garbage: %8.3f ms.", | |
2616 (known_garbage_end - clear_marked_end)*1000.0); | |
2617 } | |
2618 _collectionSetChooser->sortMarkedHeapRegions(); | |
2619 double sort_end; | |
2620 if (G1PrintParCleanupStats) { | |
2621 sort_end = os::elapsedTime(); | |
2622 gclog_or_tty->print_cr(" sorting: %8.3f ms.", | |
2623 (sort_end - known_garbage_end)*1000.0); | |
2624 } | |
2625 | |
2626 record_concurrent_mark_cleanup_end_work2(); | |
2627 double work2_end; | |
2628 if (G1PrintParCleanupStats) { | |
2629 work2_end = os::elapsedTime(); | |
2630 gclog_or_tty->print_cr(" work2: %8.3f ms.", | |
2631 (work2_end - sort_end)*1000.0); | |
2632 } | |
2633 } | |
2634 | |
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2635 // Add the heap region at the head of the non-incremental collection set |
342 | 2636 void G1CollectorPolicy:: |
2637 add_to_collection_set(HeapRegion* hr) { | |
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2638 assert(_inc_cset_build_state == Active, "Precondition"); |
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2639 assert(!hr->is_young(), "non-incremental add of young region"); |
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2640 |
1282 | 2641 if (G1PrintHeapRegions) { |
1388 | 2642 gclog_or_tty->print_cr("added region to cset " |
2643 "%d:["PTR_FORMAT", "PTR_FORMAT"], " | |
2644 "top "PTR_FORMAT", %s", | |
2645 hr->hrs_index(), hr->bottom(), hr->end(), | |
2646 hr->top(), hr->is_young() ? "YOUNG" : "NOT_YOUNG"); | |
342 | 2647 } |
2648 | |
2649 if (_g1->mark_in_progress()) | |
2650 _g1->concurrent_mark()->registerCSetRegion(hr); | |
2651 | |
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2652 assert(!hr->in_collection_set(), "should not already be in the CSet"); |
342 | 2653 hr->set_in_collection_set(true); |
2654 hr->set_next_in_collection_set(_collection_set); | |
2655 _collection_set = hr; | |
2656 _collection_set_size++; | |
2657 _collection_set_bytes_used_before += hr->used(); | |
526 | 2658 _g1->register_region_with_in_cset_fast_test(hr); |
342 | 2659 } |
2660 | |
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2661 // Initialize the per-collection-set information |
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2662 void G1CollectorPolicy::start_incremental_cset_building() { |
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2663 assert(_inc_cset_build_state == Inactive, "Precondition"); |
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2664 |
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2665 _inc_cset_head = NULL; |
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2666 _inc_cset_tail = NULL; |
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2667 _inc_cset_size = 0; |
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2668 _inc_cset_bytes_used_before = 0; |
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2669 |
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2670 if (in_young_gc_mode()) { |
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2671 _inc_cset_young_index = 0; |
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2672 } |
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2673 |
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2674 _inc_cset_max_finger = 0; |
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2675 _inc_cset_recorded_young_bytes = 0; |
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2676 _inc_cset_recorded_rs_lengths = 0; |
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2677 _inc_cset_predicted_elapsed_time_ms = 0; |
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2678 _inc_cset_predicted_bytes_to_copy = 0; |
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2679 _inc_cset_build_state = Active; |
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2680 } |
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2681 |
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2682 void G1CollectorPolicy::add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length) { |
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2683 // This routine is used when: |
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2684 // * adding survivor regions to the incremental cset at the end of an |
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2685 // evacuation pause, |
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2686 // * adding the current allocation region to the incremental cset |
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2687 // when it is retired, and |
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2688 // * updating existing policy information for a region in the |
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2689 // incremental cset via young list RSet sampling. |
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2690 // Therefore this routine may be called at a safepoint by the |
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2691 // VM thread, or in-between safepoints by mutator threads (when |
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2692 // retiring the current allocation region) or a concurrent |
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2693 // refine thread (RSet sampling). |
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2694 |
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2695 double region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, true); |
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2696 size_t used_bytes = hr->used(); |
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2697 |
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2698 _inc_cset_recorded_rs_lengths += rs_length; |
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2699 _inc_cset_predicted_elapsed_time_ms += region_elapsed_time_ms; |
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2700 |
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2701 _inc_cset_bytes_used_before += used_bytes; |
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2702 |
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2703 // Cache the values we have added to the aggregated informtion |
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2704 // in the heap region in case we have to remove this region from |
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2705 // the incremental collection set, or it is updated by the |
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2706 // rset sampling code |
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2707 hr->set_recorded_rs_length(rs_length); |
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2708 hr->set_predicted_elapsed_time_ms(region_elapsed_time_ms); |
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2709 |
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2710 #if PREDICTIONS_VERBOSE |
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2711 size_t bytes_to_copy = predict_bytes_to_copy(hr); |
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2712 _inc_cset_predicted_bytes_to_copy += bytes_to_copy; |
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2713 |
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2714 // Record the number of bytes used in this region |
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2715 _inc_cset_recorded_young_bytes += used_bytes; |
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2716 |
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2717 // Cache the values we have added to the aggregated informtion |
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2718 // in the heap region in case we have to remove this region from |
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2719 // the incremental collection set, or it is updated by the |
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2720 // rset sampling code |
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2721 hr->set_predicted_bytes_to_copy(bytes_to_copy); |
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2722 #endif // PREDICTIONS_VERBOSE |
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2723 } |
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2724 |
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2725 void G1CollectorPolicy::remove_from_incremental_cset_info(HeapRegion* hr) { |
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2726 // This routine is currently only called as part of the updating of |
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2727 // existing policy information for regions in the incremental cset that |
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2728 // is performed by the concurrent refine thread(s) as part of young list |
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2729 // RSet sampling. Therefore we should not be at a safepoint. |
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2730 |
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2731 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); |
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2732 assert(hr->is_young(), "it should be"); |
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2733 |
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2734 size_t used_bytes = hr->used(); |
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2735 size_t old_rs_length = hr->recorded_rs_length(); |
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2736 double old_elapsed_time_ms = hr->predicted_elapsed_time_ms(); |
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2737 |
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2738 // Subtract the old recorded/predicted policy information for |
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2739 // the given heap region from the collection set info. |
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2740 _inc_cset_recorded_rs_lengths -= old_rs_length; |
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2741 _inc_cset_predicted_elapsed_time_ms -= old_elapsed_time_ms; |
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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_bytes_used_before -= used_bytes; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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 // Clear the values cached in the heap region |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2746 hr->set_recorded_rs_length(0); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2747 hr->set_predicted_elapsed_time_ms(0); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2748 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2749 #if PREDICTIONS_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2750 size_t old_predicted_bytes_to_copy = hr->predicted_bytes_to_copy(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2751 _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
johnc
parents:
1391
diff
changeset
|
2752 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2753 // Subtract the number of bytes used in this region |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2754 _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
|
2755 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2756 // Clear the values cached in the heap region |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2757 hr->set_predicted_bytes_to_copy(0); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2758 #endif // PREDICTIONS_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2759 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2760 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2761 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
|
2762 // 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
|
2763 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
|
2764 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2765 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
|
2766 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
|
2767 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2768 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2769 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
|
2770 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
|
2771 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
|
2772 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
|
2773 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2774 // 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
|
2775 // 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
|
2776 // 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
|
2777 // 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
|
2778 // 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
|
2779 // 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
|
2780 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2781 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
|
2782 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
|
2783 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2784 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
|
2785 _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
|
2786 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2787 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
|
2788 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
|
2789 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
|
2790 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2791 _inc_cset_size++; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2792 _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
|
2793 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2794 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
|
2795 ++_inc_cset_young_index; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2796 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2797 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2798 // 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
|
2799 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
|
2800 // 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
|
2801 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
|
2802 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2803 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2804 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
|
2805 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2806 // 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
|
2807 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
|
2808 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
|
2809 _inc_cset_head = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2810 } else { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2811 _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
|
2812 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2813 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2814 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2815 if (G1PrintHeapRegions) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2816 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
|
2817 "%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
|
2818 "top "PTR_FORMAT", young %s", |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2819 hr->hrs_index(), hr->bottom(), hr->end(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2820 hr->top(), (hr->is_young()) ? "YES" : "NO"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2821 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2822 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2823 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2824 // Add the region to the LHS of the incremental cset |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2825 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
johnc
parents:
1391
diff
changeset
|
2826 // Survivors should be added to the RHS 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
|
2827 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
|
2828 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2829 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2830 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
|
2831 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2832 // Add the region at the left hand side |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2833 hr->set_next_in_collection_set(_inc_cset_head); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2834 if (_inc_cset_head == NULL) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2835 assert(_inc_cset_tail == NULL, "Invariant"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2836 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2837 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2838 _inc_cset_head = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2839 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2840 if (G1PrintHeapRegions) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2841 gclog_or_tty->print_cr(" added region to incremental cset (LHS) " |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2842 "%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
|
2843 "top "PTR_FORMAT", young %s", |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2844 hr->hrs_index(), hr->bottom(), hr->end(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2845 hr->top(), (hr->is_young()) ? "YES" : "NO"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2846 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2847 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2848 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2849 #ifndef PRODUCT |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2850 void G1CollectorPolicy::print_collection_set(HeapRegion* list_head, outputStream* st) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2851 assert(list_head == inc_cset_head() || list_head == collection_set(), "must be"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2852 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2853 st->print_cr("\nCollection_set:"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2854 HeapRegion* csr = list_head; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2855 while (csr != NULL) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2856 HeapRegion* next = csr->next_in_collection_set(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2857 assert(csr->in_collection_set(), "bad CS"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2858 st->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2859 "age: %4d, y: %d, surv: %d", |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2860 csr->bottom(), csr->end(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2861 csr->top(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2862 csr->prev_top_at_mark_start(), |
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
|
2863 csr->next_top_at_mark_start(), |
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
|
2864 csr->top_at_conc_mark_count(), |
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
|
2865 csr->age_in_surv_rate_group_cond(), |
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
|
2866 csr->is_young(), |
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
|
2867 csr->is_survivor()); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2868 csr = next; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2869 } |
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
|
2870 } |
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
|
2871 #endif // !PRODUCT |
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
|
2872 |
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
|
2873 bool |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2874 G1CollectorPolicy_BestRegionsFirst::choose_collection_set( |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2875 double target_pause_time_ms) { |
1394
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
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|
2876 // Set this here - in case we're not doing young collections. |
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
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|
2877 double non_young_start_time_sec = os::elapsedTime(); |
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
|
2878 |
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
|
2879 // The result that this routine will return. This will be set to |
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
|
2880 // false if: |
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
|
2881 // * we're doing a young or partially young collection and we |
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
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|
2882 // have added the youg regions to collection set, or |
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
|
2883 // * we add old regions to the collection set. |
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
|
2884 bool abandon_collection = true; |
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
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|
2885 |
342 | 2886 start_recording_regions(); |
2887 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2888 guarantee(target_pause_time_ms > 0.0, |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2889 err_msg("target_pause_time_ms = %1.6lf should be positive", |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2890 target_pause_time_ms)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2891 guarantee(_collection_set == NULL, "Precondition"); |
342 | 2892 |
2893 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
2894 double predicted_pause_time_ms = base_time_ms; | |
2895 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2896 double time_remaining_ms = target_pause_time_ms - base_time_ms; |
342 | 2897 |
2898 // the 10% and 50% values are arbitrary... | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2899 if (time_remaining_ms < 0.10 * target_pause_time_ms) { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2900 time_remaining_ms = 0.50 * target_pause_time_ms; |
342 | 2901 _within_target = false; |
2902 } else { | |
2903 _within_target = true; | |
2904 } | |
2905 | |
2906 // We figure out the number of bytes available for future to-space. | |
2907 // For new regions without marking information, we must assume the | |
2908 // worst-case of complete survival. If we have marking information for a | |
2909 // region, we can bound the amount of live data. We can add a number of | |
2910 // such regions, as long as the sum of the live data bounds does not | |
2911 // exceed the available evacuation space. | |
2912 size_t max_live_bytes = _g1->free_regions() * HeapRegion::GrainBytes; | |
2913 | |
2914 size_t expansion_bytes = | |
2915 _g1->expansion_regions() * HeapRegion::GrainBytes; | |
2916 | |
677 | 2917 _collection_set_bytes_used_before = 0; |
2918 _collection_set_size = 0; | |
342 | 2919 |
2920 // Adjust for expansion and slop. | |
2921 max_live_bytes = max_live_bytes + expansion_bytes; | |
2922 | |
677 | 2923 assert(_g1->regions_accounted_for(), "Region leakage!"); |
342 | 2924 |
2925 HeapRegion* hr; | |
2926 if (in_young_gc_mode()) { | |
2927 double young_start_time_sec = os::elapsedTime(); | |
2928 | |
2929 if (G1PolicyVerbose > 0) { | |
2930 gclog_or_tty->print_cr("Adding %d young regions to the CSet", | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2931 _g1->young_list()->length()); |
342 | 2932 } |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2933 |
342 | 2934 _young_cset_length = 0; |
2935 _last_young_gc_full = full_young_gcs() ? true : false; | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2936 |
342 | 2937 if (_last_young_gc_full) |
2938 ++_full_young_pause_num; | |
2939 else | |
2940 ++_partial_young_pause_num; | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2941 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2942 // The young list is laid with the survivor regions from the previous |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2943 // pause are appended to the RHS of the young list, i.e. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2944 // [Newly Young Regions ++ Survivors from last pause]. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2945 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2946 hr = _g1->young_list()->first_survivor_region(); |
342 | 2947 while (hr != NULL) { |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2948 assert(hr->is_survivor(), "badly formed young list"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2949 hr->set_young(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2950 hr = hr->get_next_young_region(); |
342 | 2951 } |
2952 | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2953 // Clear the fields that point to the survivor list - they are |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2954 // all young now. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2955 _g1->young_list()->clear_survivors(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2956 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2957 if (_g1->mark_in_progress()) |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2958 _g1->concurrent_mark()->register_collection_set_finger(_inc_cset_max_finger); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2959 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2960 _young_cset_length = _inc_cset_young_index; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2961 _collection_set = _inc_cset_head; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2962 _collection_set_size = _inc_cset_size; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2963 _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
johnc
parents:
1391
diff
changeset
|
2964 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2965 // For young regions in the collection set, we assume the worst |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2966 // case of complete survival |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2967 max_live_bytes -= _inc_cset_size * HeapRegion::GrainBytes; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2968 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2969 time_remaining_ms -= _inc_cset_predicted_elapsed_time_ms; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2970 predicted_pause_time_ms += _inc_cset_predicted_elapsed_time_ms; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2971 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2972 // The number of recorded young regions is the incremental |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2973 // collection set's current size |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2974 set_recorded_young_regions(_inc_cset_size); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2975 set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2976 set_recorded_young_bytes(_inc_cset_recorded_young_bytes); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2977 #if PREDICTIONS_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2978 set_predicted_bytes_to_copy(_inc_cset_predicted_bytes_to_copy); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2979 #endif // PREDICTIONS_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2980 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2981 if (G1PolicyVerbose > 0) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2982 gclog_or_tty->print_cr(" Added " PTR_FORMAT " Young Regions to CS.", |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2983 _inc_cset_size); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2984 gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2985 max_live_bytes/K); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2986 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2987 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2988 assert(_inc_cset_size == _g1->young_list()->length(), "Invariant"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2989 if (_inc_cset_size > 0) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2990 assert(_collection_set != NULL, "Invariant"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2991 abandon_collection = false; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2992 } |
342 | 2993 |
2994 double young_end_time_sec = os::elapsedTime(); | |
2995 _recorded_young_cset_choice_time_ms = | |
2996 (young_end_time_sec - young_start_time_sec) * 1000.0; | |
2997 | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2998 // We are doing young collections so reset this. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2999 non_young_start_time_sec = young_end_time_sec; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3000 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3001 // Note we can use either _collection_set_size or |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3002 // _young_cset_length here |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3003 if (_collection_set_size > 0 && _last_young_gc_full) { |
342 | 3004 // don't bother adding more regions... |
3005 goto choose_collection_set_end; | |
3006 } | |
3007 } | |
3008 | |
3009 if (!in_young_gc_mode() || !full_young_gcs()) { | |
3010 bool should_continue = true; | |
3011 NumberSeq seq; | |
3012 double avg_prediction = 100000000000000000.0; // something very large | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3013 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3014 // Save the current size of the collection set to detect |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3015 // if we actually added any old regions. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3016 size_t n_young_regions = _collection_set_size; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
3017 |
342 | 3018 do { |
3019 hr = _collectionSetChooser->getNextMarkedRegion(time_remaining_ms, | |
3020 avg_prediction); | |
677 | 3021 if (hr != NULL) { |
342 | 3022 double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
3023 time_remaining_ms -= predicted_time_ms; | |
3024 predicted_pause_time_ms += predicted_time_ms; | |
3025 add_to_collection_set(hr); | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3026 record_non_young_cset_region(hr); |
342 | 3027 max_live_bytes -= MIN2(hr->max_live_bytes(), max_live_bytes); |
3028 if (G1PolicyVerbose > 0) { | |
3029 gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", | |
3030 max_live_bytes/K); | |
3031 } | |
3032 seq.add(predicted_time_ms); | |
3033 avg_prediction = seq.avg() + seq.sd(); | |
3034 } | |
3035 should_continue = | |
3036 ( hr != NULL) && | |
3037 ( (adaptive_young_list_length()) ? time_remaining_ms > 0.0 | |
3038 : _collection_set_size < _young_list_fixed_length ); | |
3039 } while (should_continue); | |
3040 | |
3041 if (!adaptive_young_list_length() && | |
3042 _collection_set_size < _young_list_fixed_length) | |
3043 _should_revert_to_full_young_gcs = true; | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3044 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3045 if (_collection_set_size > n_young_regions) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
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3046 // We actually added old regions to the collection set |
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3047 // so we are not abandoning this collection. |
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3048 abandon_collection = false; |
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3049 } |
342 | 3050 } |
3051 | |
3052 choose_collection_set_end: | |
1394
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3053 stop_incremental_cset_building(); |
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3054 |
342 | 3055 count_CS_bytes_used(); |
3056 | |
3057 end_recording_regions(); | |
3058 | |
3059 double non_young_end_time_sec = os::elapsedTime(); | |
3060 _recorded_non_young_cset_choice_time_ms = | |
3061 (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; | |
1394
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3062 |
1656
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3063 // Here we are supposed to return whether the pause should be |
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3064 // abandoned or not (i.e., whether the collection set is empty or |
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3065 // not). However, this introduces a subtle issue when a pause is |
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3066 // initiated explicitly with System.gc() and |
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3067 // +ExplicitGCInvokesConcurrent (see Comment #2 in CR 6944166), it's |
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3068 // supposed to start a marking cycle, and it's abandoned. So, by |
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3069 // returning false here we are telling the caller never to consider |
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3070 // a pause to be abandoned. We'll actually remove all the code |
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3071 // associated with abandoned pauses as part of CR 6963209, but we are |
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3072 // just disabling them this way for the moment to avoid increasing |
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3073 // further the amount of changes for CR 6944166. |
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3074 return false; |
342 | 3075 } |
3076 | |
3077 void G1CollectorPolicy_BestRegionsFirst::record_full_collection_end() { | |
3078 G1CollectorPolicy::record_full_collection_end(); | |
3079 _collectionSetChooser->updateAfterFullCollection(); | |
3080 } | |
3081 | |
3082 void G1CollectorPolicy_BestRegionsFirst:: | |
3083 expand_if_possible(size_t numRegions) { | |
3084 size_t expansion_bytes = numRegions * HeapRegion::GrainBytes; | |
3085 _g1->expand(expansion_bytes); | |
3086 } | |
3087 | |
3088 void G1CollectorPolicy_BestRegionsFirst:: | |
677 | 3089 record_collection_pause_end(bool abandoned) { |
3090 G1CollectorPolicy::record_collection_pause_end(abandoned); | |
342 | 3091 assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end."); |
3092 } |