Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 1861:c32059ef4dc0
6971296: G1: simplify G1RemSet class hierarchy
Summary: Remove G1RemSet base class and StupidG1RemSet class; rename HRInto_G1RemSet to just G1RemSet.
Reviewed-by: ysr, tonyp
author | johnc |
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date | Tue, 12 Oct 2010 09:36:48 -0700 |
parents | 8b10f48633dc |
children | f95d63e2154a |
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() : | |
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75 _parallel_gc_threads(G1CollectedHeap::use_parallel_gc_threads() |
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76 ? ParallelGCThreads : 1), |
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77 |
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78 |
342 | 79 _n_pauses(0), |
80 _recent_CH_strong_roots_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
81 _recent_G1_strong_roots_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
82 _recent_evac_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
83 _recent_pause_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
84 _recent_rs_sizes(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
85 _recent_gc_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
86 _all_pause_times_ms(new NumberSeq()), | |
87 _stop_world_start(0.0), | |
88 _all_stop_world_times_ms(new NumberSeq()), | |
89 _all_yield_times_ms(new NumberSeq()), | |
90 | |
91 _all_mod_union_times_ms(new NumberSeq()), | |
92 | |
677 | 93 _summary(new Summary()), |
342 | 94 |
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95 #ifndef PRODUCT |
342 | 96 _cur_clear_ct_time_ms(0.0), |
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97 _min_clear_cc_time_ms(-1.0), |
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98 _max_clear_cc_time_ms(-1.0), |
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99 _cur_clear_cc_time_ms(0.0), |
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100 _cum_clear_cc_time_ms(0.0), |
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101 _num_cc_clears(0L), |
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102 #endif |
342 | 103 |
104 _region_num_young(0), | |
105 _region_num_tenured(0), | |
106 _prev_region_num_young(0), | |
107 _prev_region_num_tenured(0), | |
108 | |
109 _aux_num(10), | |
110 _all_aux_times_ms(new NumberSeq[_aux_num]), | |
111 _cur_aux_start_times_ms(new double[_aux_num]), | |
112 _cur_aux_times_ms(new double[_aux_num]), | |
113 _cur_aux_times_set(new bool[_aux_num]), | |
114 | |
115 _concurrent_mark_init_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
116 _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
117 _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
118 | |
119 // <NEW PREDICTION> | |
120 | |
121 _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
122 _prev_collection_pause_end_ms(0.0), | |
123 _pending_card_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
124 _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
125 _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
126 _fully_young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), | |
127 _partially_young_cards_per_entry_ratio_seq( | |
128 new TruncatedSeq(TruncatedSeqLength)), | |
129 _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
130 _partially_young_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
131 _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
132 _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
133 _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
134 _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
135 _non_young_other_cost_per_region_ms_seq( | |
136 new TruncatedSeq(TruncatedSeqLength)), | |
137 | |
138 _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
139 _scanned_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
140 _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), | |
141 | |
751 | 142 _pause_time_target_ms((double) MaxGCPauseMillis), |
342 | 143 |
144 // </NEW PREDICTION> | |
145 | |
146 _in_young_gc_mode(false), | |
147 _full_young_gcs(true), | |
148 _full_young_pause_num(0), | |
149 _partial_young_pause_num(0), | |
150 | |
151 _during_marking(false), | |
152 _in_marking_window(false), | |
153 _in_marking_window_im(false), | |
154 | |
155 _known_garbage_ratio(0.0), | |
156 _known_garbage_bytes(0), | |
157 | |
158 _young_gc_eff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
159 | |
160 _recent_prev_end_times_for_all_gcs_sec(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
161 | |
162 _recent_CS_bytes_used_before(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
163 _recent_CS_bytes_surviving(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
164 | |
165 _recent_avg_pause_time_ratio(0.0), | |
166 _num_markings(0), | |
167 _n_marks(0), | |
168 _n_pauses_at_mark_end(0), | |
169 | |
170 _all_full_gc_times_ms(new NumberSeq()), | |
171 | |
172 // G1PausesBtwnConcMark defaults to -1 | |
173 // so the hack is to do the cast QQQ FIXME | |
174 _pauses_btwn_concurrent_mark((size_t)G1PausesBtwnConcMark), | |
175 _n_marks_since_last_pause(0), | |
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176 _initiate_conc_mark_if_possible(false), |
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177 _during_initial_mark_pause(false), |
342 | 178 _should_revert_to_full_young_gcs(false), |
179 _last_full_young_gc(false), | |
180 | |
181 _prev_collection_pause_used_at_end_bytes(0), | |
182 | |
183 _collection_set(NULL), | |
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184 _collection_set_size(0), |
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185 _collection_set_bytes_used_before(0), |
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186 |
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187 // Incremental CSet attributes |
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188 _inc_cset_build_state(Inactive), |
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189 _inc_cset_head(NULL), |
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190 _inc_cset_tail(NULL), |
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191 _inc_cset_size(0), |
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192 _inc_cset_young_index(0), |
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193 _inc_cset_bytes_used_before(0), |
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194 _inc_cset_max_finger(NULL), |
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195 _inc_cset_recorded_young_bytes(0), |
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196 _inc_cset_recorded_rs_lengths(0), |
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197 _inc_cset_predicted_elapsed_time_ms(0.0), |
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198 _inc_cset_predicted_bytes_to_copy(0), |
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199 |
342 | 200 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
201 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
202 #endif // _MSC_VER | |
203 | |
204 _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", | |
205 G1YoungSurvRateNumRegionsSummary)), | |
206 _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", | |
545 | 207 G1YoungSurvRateNumRegionsSummary)), |
342 | 208 // add here any more surv rate groups |
545 | 209 _recorded_survivor_regions(0), |
210 _recorded_survivor_head(NULL), | |
211 _recorded_survivor_tail(NULL), | |
1356 | 212 _survivors_age_table(true), |
213 | |
214 _gc_overhead_perc(0.0) | |
545 | 215 |
342 | 216 { |
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217 // Set up the region size and associated fields. Given that the |
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218 // policy is created before the heap, we have to set this up here, |
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219 // so it's done as soon as possible. |
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220 HeapRegion::setup_heap_region_size(Arguments::min_heap_size()); |
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221 HeapRegionRemSet::setup_remset_size(); |
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222 |
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223 // Verify PLAB sizes |
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224 const uint region_size = HeapRegion::GrainWords; |
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225 if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
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226 char buffer[128]; |
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227 jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most %u", |
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228 OldPLABSize > region_size ? "Old" : "Young", region_size); |
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229 vm_exit_during_initialization(buffer); |
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230 } |
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231 |
342 | 232 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
233 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
234 | |
1611 | 235 _par_last_gc_worker_start_times_ms = new double[_parallel_gc_threads]; |
342 | 236 _par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads]; |
237 _par_last_mark_stack_scan_times_ms = new double[_parallel_gc_threads]; | |
238 | |
239 _par_last_update_rs_times_ms = new double[_parallel_gc_threads]; | |
240 _par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; | |
241 | |
242 _par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; | |
243 | |
244 _par_last_obj_copy_times_ms = new double[_parallel_gc_threads]; | |
245 | |
246 _par_last_termination_times_ms = new double[_parallel_gc_threads]; | |
1611 | 247 _par_last_termination_attempts = new double[_parallel_gc_threads]; |
248 _par_last_gc_worker_end_times_ms = new double[_parallel_gc_threads]; | |
342 | 249 |
250 // start conservatively | |
751 | 251 _expensive_region_limit_ms = 0.5 * (double) MaxGCPauseMillis; |
342 | 252 |
253 // <NEW PREDICTION> | |
254 | |
255 int index; | |
256 if (ParallelGCThreads == 0) | |
257 index = 0; | |
258 else if (ParallelGCThreads > 8) | |
259 index = 7; | |
260 else | |
261 index = ParallelGCThreads - 1; | |
262 | |
263 _pending_card_diff_seq->add(0.0); | |
264 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
265 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
266 _fully_young_cards_per_entry_ratio_seq->add( | |
267 fully_young_cards_per_entry_ratio_defaults[index]); | |
268 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); | |
269 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
270 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
271 _young_other_cost_per_region_ms_seq->add( | |
272 young_other_cost_per_region_ms_defaults[index]); | |
273 _non_young_other_cost_per_region_ms_seq->add( | |
274 non_young_other_cost_per_region_ms_defaults[index]); | |
275 | |
276 // </NEW PREDICTION> | |
277 | |
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278 // Below, we might need to calculate the pause time target based on |
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279 // the pause interval. When we do so we are going to give G1 maximum |
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280 // flexibility and allow it to do pauses when it needs to. So, we'll |
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281 // arrange that the pause interval to be pause time target + 1 to |
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282 // ensure that a) the pause time target is maximized with respect to |
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283 // the pause interval and b) we maintain the invariant that pause |
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284 // time target < pause interval. If the user does not want this |
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285 // maximum flexibility, they will have to set the pause interval |
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286 // explicitly. |
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287 |
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288 // First make sure that, if either parameter is set, its value is |
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289 // reasonable. |
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290 if (!FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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291 if (MaxGCPauseMillis < 1) { |
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292 vm_exit_during_initialization("MaxGCPauseMillis should be " |
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293 "greater than 0"); |
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294 } |
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295 } |
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296 if (!FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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297 if (GCPauseIntervalMillis < 1) { |
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298 vm_exit_during_initialization("GCPauseIntervalMillis should be " |
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299 "greater than 0"); |
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300 } |
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301 } |
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302 |
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303 // Then, if the pause time target parameter was not set, set it to |
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304 // the default value. |
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305 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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306 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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307 // The default pause time target in G1 is 200ms |
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308 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); |
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309 } else { |
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310 // We do not allow the pause interval to be set without the |
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311 // pause time target |
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312 vm_exit_during_initialization("GCPauseIntervalMillis cannot be set " |
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313 "without setting MaxGCPauseMillis"); |
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314 } |
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315 } |
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316 |
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317 // Then, if the interval parameter was not set, set it according to |
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318 // the pause time target (this will also deal with the case when the |
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319 // pause time target is the default value). |
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320 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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321 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); |
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322 } |
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323 |
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324 // Finally, make sure that the two parameters are consistent. |
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325 if (MaxGCPauseMillis >= GCPauseIntervalMillis) { |
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326 char buffer[256]; |
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327 jio_snprintf(buffer, 256, |
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328 "MaxGCPauseMillis (%u) should be less than " |
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329 "GCPauseIntervalMillis (%u)", |
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330 MaxGCPauseMillis, GCPauseIntervalMillis); |
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331 vm_exit_during_initialization(buffer); |
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332 } |
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333 |
751 | 334 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; |
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335 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
342 | 336 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); |
751 | 337 _sigma = (double) G1ConfidencePercent / 100.0; |
342 | 338 |
339 // start conservatively (around 50ms is about right) | |
340 _concurrent_mark_init_times_ms->add(0.05); | |
341 _concurrent_mark_remark_times_ms->add(0.05); | |
342 _concurrent_mark_cleanup_times_ms->add(0.20); | |
343 _tenuring_threshold = MaxTenuringThreshold; | |
344 | |
1282 | 345 // if G1FixedSurvivorSpaceSize is 0 which means the size is not |
346 // fixed, then _max_survivor_regions will be calculated at | |
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347 // calculate_young_list_target_length during initialization |
1282 | 348 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
545 | 349 |
1356 | 350 assert(GCTimeRatio > 0, |
351 "we should have set it to a default value set_g1_gc_flags() " | |
352 "if a user set it to 0"); | |
353 _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); | |
354 | |
342 | 355 initialize_all(); |
356 } | |
357 | |
358 // Increment "i", mod "len" | |
359 static void inc_mod(int& i, int len) { | |
360 i++; if (i == len) i = 0; | |
361 } | |
362 | |
363 void G1CollectorPolicy::initialize_flags() { | |
364 set_min_alignment(HeapRegion::GrainBytes); | |
365 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
547
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366 if (SurvivorRatio < 1) { |
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367 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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368 } |
342 | 369 CollectorPolicy::initialize_flags(); |
370 } | |
371 | |
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372 // The easiest way to deal with the parsing of the NewSize / |
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373 // MaxNewSize / etc. parameteres is to re-use the code in the |
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374 // TwoGenerationCollectorPolicy class. This is similar to what |
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375 // ParallelScavenge does with its GenerationSizer class (see |
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376 // ParallelScavengeHeap::initialize()). We might change this in the |
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377 // future, but it's a good start. |
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378 class G1YoungGenSizer : public TwoGenerationCollectorPolicy { |
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379 size_t size_to_region_num(size_t byte_size) { |
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380 return MAX2((size_t) 1, byte_size / HeapRegion::GrainBytes); |
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381 } |
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382 |
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383 public: |
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384 G1YoungGenSizer() { |
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385 initialize_flags(); |
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386 initialize_size_info(); |
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387 } |
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388 |
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389 size_t min_young_region_num() { |
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390 return size_to_region_num(_min_gen0_size); |
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391 } |
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392 size_t initial_young_region_num() { |
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393 return size_to_region_num(_initial_gen0_size); |
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394 } |
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395 size_t max_young_region_num() { |
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396 return size_to_region_num(_max_gen0_size); |
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397 } |
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398 }; |
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399 |
342 | 400 void G1CollectorPolicy::init() { |
401 // Set aside an initial future to_space. | |
402 _g1 = G1CollectedHeap::heap(); | |
403 | |
404 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
405 | |
545 | 406 initialize_gc_policy_counters(); |
407 | |
342 | 408 if (G1Gen) { |
409 _in_young_gc_mode = true; | |
410 | |
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411 G1YoungGenSizer sizer; |
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412 size_t initial_region_num = sizer.initial_young_region_num(); |
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413 |
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414 if (UseAdaptiveSizePolicy) { |
342 | 415 set_adaptive_young_list_length(true); |
416 _young_list_fixed_length = 0; | |
417 } else { | |
418 set_adaptive_young_list_length(false); | |
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419 _young_list_fixed_length = initial_region_num; |
342 | 420 } |
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421 _free_regions_at_end_of_collection = _g1->free_regions(); |
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422 calculate_young_list_min_length(); |
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423 guarantee( _young_list_min_length == 0, "invariant, not enough info" ); |
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424 calculate_young_list_target_length(); |
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425 } else { |
342 | 426 _young_list_fixed_length = 0; |
427 _in_young_gc_mode = false; | |
428 } | |
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429 |
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430 // We may immediately start allocating regions and placing them on the |
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431 // collection set list. Initialize the per-collection set info |
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432 start_incremental_cset_building(); |
342 | 433 } |
434 | |
545 | 435 // Create the jstat counters for the policy. |
436 void G1CollectorPolicy::initialize_gc_policy_counters() | |
437 { | |
438 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 2 + G1Gen); | |
439 } | |
440 | |
342 | 441 void G1CollectorPolicy::calculate_young_list_min_length() { |
442 _young_list_min_length = 0; | |
443 | |
444 if (!adaptive_young_list_length()) | |
445 return; | |
446 | |
447 if (_alloc_rate_ms_seq->num() > 3) { | |
448 double now_sec = os::elapsedTime(); | |
449 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; | |
450 double alloc_rate_ms = predict_alloc_rate_ms(); | |
451 int min_regions = (int) ceil(alloc_rate_ms * when_ms); | |
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452 int current_region_num = (int) _g1->young_list()->length(); |
342 | 453 _young_list_min_length = min_regions + current_region_num; |
454 } | |
455 } | |
456 | |
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457 void G1CollectorPolicy::calculate_young_list_target_length() { |
342 | 458 if (adaptive_young_list_length()) { |
459 size_t rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); | |
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460 calculate_young_list_target_length(rs_lengths); |
342 | 461 } else { |
462 if (full_young_gcs()) | |
463 _young_list_target_length = _young_list_fixed_length; | |
464 else | |
465 _young_list_target_length = _young_list_fixed_length / 2; | |
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466 |
342 | 467 _young_list_target_length = MAX2(_young_list_target_length, (size_t)1); |
468 } | |
545 | 469 calculate_survivors_policy(); |
342 | 470 } |
471 | |
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472 void G1CollectorPolicy::calculate_young_list_target_length(size_t rs_lengths) { |
342 | 473 guarantee( adaptive_young_list_length(), "pre-condition" ); |
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474 guarantee( !_in_marking_window || !_last_full_young_gc, "invariant" ); |
342 | 475 |
476 double start_time_sec = os::elapsedTime(); | |
1282 | 477 size_t min_reserve_perc = MAX2((size_t)2, (size_t)G1ReservePercent); |
342 | 478 min_reserve_perc = MIN2((size_t) 50, min_reserve_perc); |
479 size_t reserve_regions = | |
480 (size_t) ((double) min_reserve_perc * (double) _g1->n_regions() / 100.0); | |
481 | |
482 if (full_young_gcs() && _free_regions_at_end_of_collection > 0) { | |
483 // we are in fully-young mode and there are free regions in the heap | |
484 | |
545 | 485 double survivor_regions_evac_time = |
486 predict_survivor_regions_evac_time(); | |
487 | |
342 | 488 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
489 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); | |
490 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); | |
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491 size_t scanned_cards = predict_young_card_num(adj_rs_lengths); |
545 | 492 double base_time_ms = predict_base_elapsed_time_ms(pending_cards, scanned_cards) |
493 + survivor_regions_evac_time; | |
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494 |
342 | 495 // the result |
496 size_t final_young_length = 0; | |
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497 |
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498 size_t init_free_regions = |
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499 MAX2((size_t)0, _free_regions_at_end_of_collection - reserve_regions); |
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500 |
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501 // if we're still under the pause target... |
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502 if (base_time_ms <= target_pause_time_ms) { |
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503 // We make sure that the shortest young length that makes sense |
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504 // fits within the target pause time. |
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505 size_t min_young_length = 1; |
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506 |
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507 if (predict_will_fit(min_young_length, base_time_ms, |
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508 init_free_regions, target_pause_time_ms)) { |
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509 // The shortest young length will fit within the target pause time; |
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510 // we'll now check whether the absolute maximum number of young |
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511 // regions will fit in the target pause time. If not, we'll do |
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512 // a binary search between min_young_length and max_young_length |
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513 size_t abs_max_young_length = _free_regions_at_end_of_collection - 1; |
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514 size_t max_young_length = abs_max_young_length; |
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515 |
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516 if (max_young_length > min_young_length) { |
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517 // Let's check if the initial max young length will fit within the |
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518 // target pause. If so then there is no need to search for a maximal |
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519 // young length - we'll return the initial maximum |
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520 |
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521 if (predict_will_fit(max_young_length, base_time_ms, |
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522 init_free_regions, target_pause_time_ms)) { |
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523 // The maximum young length will satisfy the target pause time. |
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524 // We are done so set min young length to this maximum length. |
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525 // The code after the loop will then set final_young_length using |
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526 // the value cached in the minimum length. |
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527 min_young_length = max_young_length; |
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528 } else { |
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529 // The maximum possible number of young regions will not fit within |
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530 // the target pause time so let's search.... |
342 | 531 |
532 size_t diff = (max_young_length - min_young_length) / 2; | |
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533 max_young_length = min_young_length + diff; |
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534 |
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535 while (max_young_length > min_young_length) { |
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536 if (predict_will_fit(max_young_length, base_time_ms, |
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537 init_free_regions, target_pause_time_ms)) { |
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538 |
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539 // The current max young length will fit within the target |
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540 // pause time. Note we do not exit the loop here. By setting |
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541 // min = max, and then increasing the max below means that |
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542 // we will continue searching for an upper bound in the |
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543 // range [max..max+diff] |
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544 min_young_length = max_young_length; |
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545 } |
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546 diff = (max_young_length - min_young_length) / 2; |
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547 max_young_length = min_young_length + diff; |
342 | 548 } |
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549 // the above loop found a maximal young length that will fit |
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550 // within the target pause time. |
342 | 551 } |
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552 assert(min_young_length <= abs_max_young_length, "just checking"); |
342 | 553 } |
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554 final_young_length = min_young_length; |
342 | 555 } |
556 } | |
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557 // and we're done! |
342 | 558 |
559 // we should have at least one region in the target young length | |
545 | 560 _young_list_target_length = |
561 MAX2((size_t) 1, final_young_length + _recorded_survivor_regions); | |
342 | 562 |
563 // let's keep an eye of how long we spend on this calculation | |
564 // right now, I assume that we'll print it when we need it; we | |
565 // should really adde it to the breakdown of a pause | |
566 double end_time_sec = os::elapsedTime(); | |
567 double elapsed_time_ms = (end_time_sec - start_time_sec) * 1000.0; | |
568 | |
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569 #ifdef TRACE_CALC_YOUNG_LENGTH |
342 | 570 // leave this in for debugging, just in case |
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571 gclog_or_tty->print_cr("target = %1.1lf ms, young = " SIZE_FORMAT ", " |
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572 "elapsed %1.2lf ms, (%s%s) " SIZE_FORMAT SIZE_FORMAT, |
342 | 573 target_pause_time_ms, |
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574 _young_list_target_length |
342 | 575 elapsed_time_ms, |
576 full_young_gcs() ? "full" : "partial", | |
1359
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577 during_initial_mark_pause() ? " i-m" : "", |
545 | 578 _in_marking_window, |
579 _in_marking_window_im); | |
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580 #endif // TRACE_CALC_YOUNG_LENGTH |
342 | 581 |
582 if (_young_list_target_length < _young_list_min_length) { | |
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583 // bummer; this means that, if we do a pause when the maximal |
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584 // length dictates, we'll violate the pause spacing target (the |
342 | 585 // min length was calculate based on the application's current |
586 // alloc rate); | |
587 | |
588 // so, we have to bite the bullet, and allocate the minimum | |
589 // number. We'll violate our target, but we just can't meet it. | |
590 | |
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591 #ifdef TRACE_CALC_YOUNG_LENGTH |
342 | 592 // leave this in for debugging, just in case |
593 gclog_or_tty->print_cr("adjusted target length from " | |
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594 SIZE_FORMAT " to " SIZE_FORMAT, |
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595 _young_list_target_length, _young_list_min_length); |
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596 #endif // TRACE_CALC_YOUNG_LENGTH |
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597 |
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598 _young_list_target_length = _young_list_min_length; |
342 | 599 } |
600 } else { | |
601 // we are in a partially-young mode or we've run out of regions (due | |
602 // to evacuation failure) | |
603 | |
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604 #ifdef TRACE_CALC_YOUNG_LENGTH |
342 | 605 // leave this in for debugging, just in case |
606 gclog_or_tty->print_cr("(partial) setting target to " SIZE_FORMAT | |
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607 _young_list_min_length); |
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608 #endif // TRACE_CALC_YOUNG_LENGTH |
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609 // we'll do the pause as soon as possible by choosing the minimum |
342 | 610 _young_list_target_length = |
611 MAX2(_young_list_min_length, (size_t) 1); | |
612 } | |
613 | |
614 _rs_lengths_prediction = rs_lengths; | |
615 } | |
616 | |
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617 // This is used by: calculate_young_list_target_length(rs_length). It |
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618 // returns true iff: |
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619 // the predicted pause time for the given young list will not overflow |
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620 // the target pause time |
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621 // and: |
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622 // the predicted amount of surviving data will not overflow the |
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623 // the amount of free space available for survivor regions. |
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624 // |
342 | 625 bool |
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626 G1CollectorPolicy::predict_will_fit(size_t young_length, |
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627 double base_time_ms, |
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628 size_t init_free_regions, |
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629 double target_pause_time_ms) { |
342 | 630 |
631 if (young_length >= init_free_regions) | |
632 // end condition 1: not enough space for the young regions | |
633 return false; | |
634 | |
635 double accum_surv_rate_adj = 0.0; | |
636 double accum_surv_rate = | |
637 accum_yg_surv_rate_pred((int)(young_length - 1)) - accum_surv_rate_adj; | |
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638 |
342 | 639 size_t bytes_to_copy = |
640 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); | |
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641 |
342 | 642 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
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643 |
342 | 644 double young_other_time_ms = |
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645 predict_young_other_time_ms(young_length); |
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646 |
342 | 647 double pause_time_ms = |
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648 base_time_ms + copy_time_ms + young_other_time_ms; |
342 | 649 |
650 if (pause_time_ms > target_pause_time_ms) | |
651 // end condition 2: over the target pause time | |
652 return false; | |
653 | |
654 size_t free_bytes = | |
655 (init_free_regions - young_length) * HeapRegion::GrainBytes; | |
656 | |
657 if ((2.0 + sigma()) * (double) bytes_to_copy > (double) free_bytes) | |
658 // end condition 3: out of to-space (conservatively) | |
659 return false; | |
660 | |
661 // success! | |
662 return true; | |
663 } | |
664 | |
545 | 665 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
666 double survivor_regions_evac_time = 0.0; | |
667 for (HeapRegion * r = _recorded_survivor_head; | |
668 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
669 r = r->get_next_young_region()) { | |
670 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); | |
671 } | |
672 return survivor_regions_evac_time; | |
673 } | |
674 | |
342 | 675 void G1CollectorPolicy::check_prediction_validity() { |
676 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); | |
677 | |
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678 size_t rs_lengths = _g1->young_list()->sampled_rs_lengths(); |
342 | 679 if (rs_lengths > _rs_lengths_prediction) { |
680 // add 10% to avoid having to recalculate often | |
681 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
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682 calculate_young_list_target_length(rs_lengths_prediction); |
342 | 683 } |
684 } | |
685 | |
686 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, | |
687 bool is_tlab, | |
688 bool* gc_overhead_limit_was_exceeded) { | |
689 guarantee(false, "Not using this policy feature yet."); | |
690 return NULL; | |
691 } | |
692 | |
693 // This method controls how a collector handles one or more | |
694 // of its generations being fully allocated. | |
695 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
696 bool is_tlab) { | |
697 guarantee(false, "Not using this policy feature yet."); | |
698 return NULL; | |
699 } | |
700 | |
701 | |
702 #ifndef PRODUCT | |
703 bool G1CollectorPolicy::verify_young_ages() { | |
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704 HeapRegion* head = _g1->young_list()->first_region(); |
342 | 705 return |
706 verify_young_ages(head, _short_lived_surv_rate_group); | |
707 // also call verify_young_ages on any additional surv rate groups | |
708 } | |
709 | |
710 bool | |
711 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
712 SurvRateGroup *surv_rate_group) { | |
713 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
714 | |
715 const char* name = surv_rate_group->name(); | |
716 bool ret = true; | |
717 int prev_age = -1; | |
718 | |
719 for (HeapRegion* curr = head; | |
720 curr != NULL; | |
721 curr = curr->get_next_young_region()) { | |
722 SurvRateGroup* group = curr->surv_rate_group(); | |
723 if (group == NULL && !curr->is_survivor()) { | |
724 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
725 ret = false; | |
726 } | |
727 | |
728 if (surv_rate_group == group) { | |
729 int age = curr->age_in_surv_rate_group(); | |
730 | |
731 if (age < 0) { | |
732 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
733 ret = false; | |
734 } | |
735 | |
736 if (age <= prev_age) { | |
737 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
738 "(%d, %d)", name, age, prev_age); | |
739 ret = false; | |
740 } | |
741 prev_age = age; | |
742 } | |
743 } | |
744 | |
745 return ret; | |
746 } | |
747 #endif // PRODUCT | |
748 | |
749 void G1CollectorPolicy::record_full_collection_start() { | |
750 _cur_collection_start_sec = os::elapsedTime(); | |
751 // Release the future to-space so that it is available for compaction into. | |
752 _g1->set_full_collection(); | |
753 } | |
754 | |
755 void G1CollectorPolicy::record_full_collection_end() { | |
756 // Consider this like a collection pause for the purposes of allocation | |
757 // since last pause. | |
758 double end_sec = os::elapsedTime(); | |
759 double full_gc_time_sec = end_sec - _cur_collection_start_sec; | |
760 double full_gc_time_ms = full_gc_time_sec * 1000.0; | |
761 | |
762 _all_full_gc_times_ms->add(full_gc_time_ms); | |
763 | |
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764 update_recent_gc_times(end_sec, full_gc_time_ms); |
342 | 765 |
766 _g1->clear_full_collection(); | |
767 | |
768 // "Nuke" the heuristics that control the fully/partially young GC | |
769 // transitions and make sure we start with fully young GCs after the | |
770 // Full GC. | |
771 set_full_young_gcs(true); | |
772 _last_full_young_gc = false; | |
773 _should_revert_to_full_young_gcs = false; | |
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774 clear_initiate_conc_mark_if_possible(); |
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775 clear_during_initial_mark_pause(); |
342 | 776 _known_garbage_bytes = 0; |
777 _known_garbage_ratio = 0.0; | |
778 _in_marking_window = false; | |
779 _in_marking_window_im = false; | |
780 | |
781 _short_lived_surv_rate_group->start_adding_regions(); | |
782 // also call this on any additional surv rate groups | |
783 | |
545 | 784 record_survivor_regions(0, NULL, NULL); |
785 | |
342 | 786 _prev_region_num_young = _region_num_young; |
787 _prev_region_num_tenured = _region_num_tenured; | |
788 | |
789 _free_regions_at_end_of_collection = _g1->free_regions(); | |
545 | 790 // Reset survivors SurvRateGroup. |
791 _survivor_surv_rate_group->reset(); | |
342 | 792 calculate_young_list_min_length(); |
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793 calculate_young_list_target_length(); |
342 | 794 } |
795 | |
796 void G1CollectorPolicy::record_before_bytes(size_t bytes) { | |
797 _bytes_in_to_space_before_gc += bytes; | |
798 } | |
799 | |
800 void G1CollectorPolicy::record_after_bytes(size_t bytes) { | |
801 _bytes_in_to_space_after_gc += bytes; | |
802 } | |
803 | |
804 void G1CollectorPolicy::record_stop_world_start() { | |
805 _stop_world_start = os::elapsedTime(); | |
806 } | |
807 | |
808 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, | |
809 size_t start_used) { | |
810 if (PrintGCDetails) { | |
811 gclog_or_tty->stamp(PrintGCTimeStamps); | |
812 gclog_or_tty->print("[GC pause"); | |
813 if (in_young_gc_mode()) | |
814 gclog_or_tty->print(" (%s)", full_young_gcs() ? "young" : "partial"); | |
815 } | |
816 | |
817 assert(_g1->used_regions() == _g1->recalculate_used_regions(), | |
818 "sanity"); | |
636 | 819 assert(_g1->used() == _g1->recalculate_used(), "sanity"); |
342 | 820 |
821 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
822 _all_stop_world_times_ms->add(s_w_t_ms); | |
823 _stop_world_start = 0.0; | |
824 | |
825 _cur_collection_start_sec = start_time_sec; | |
826 _cur_collection_pause_used_at_start_bytes = start_used; | |
827 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); | |
828 _pending_cards = _g1->pending_card_num(); | |
829 _max_pending_cards = _g1->max_pending_card_num(); | |
830 | |
831 _bytes_in_to_space_before_gc = 0; | |
832 _bytes_in_to_space_after_gc = 0; | |
833 _bytes_in_collection_set_before_gc = 0; | |
834 | |
835 #ifdef DEBUG | |
836 // initialise these to something well known so that we can spot | |
837 // if they are not set properly | |
838 | |
839 for (int i = 0; i < _parallel_gc_threads; ++i) { | |
1611 | 840 _par_last_gc_worker_start_times_ms[i] = -1234.0; |
841 _par_last_ext_root_scan_times_ms[i] = -1234.0; | |
842 _par_last_mark_stack_scan_times_ms[i] = -1234.0; | |
843 _par_last_update_rs_times_ms[i] = -1234.0; | |
844 _par_last_update_rs_processed_buffers[i] = -1234.0; | |
845 _par_last_scan_rs_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) { | |
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1079 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 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) { | |
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1090 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 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) { | |
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1102 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 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 | |
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1116 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 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 | |
1707 | 1129 void G1CollectorPolicy::record_collection_pause_end() { |
342 | 1130 double end_time_sec = os::elapsedTime(); |
1131 double elapsed_ms = _last_pause_time_ms; | |
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1132 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
342 | 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; | |
1707 | 1139 bool update_stats = !_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()) { | |
1359
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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; | |
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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 | |
1707 | 1278 PauseSummary* summary = _summary; |
342 | 1279 |
1280 double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); | |
1281 double mark_stack_scan_time = avg_value(_par_last_mark_stack_scan_times_ms); | |
1282 double update_rs_time = avg_value(_par_last_update_rs_times_ms); | |
1283 double update_rs_processed_buffers = | |
1284 sum_of_values(_par_last_update_rs_processed_buffers); | |
1285 double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); | |
1286 double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); | |
1287 double termination_time = avg_value(_par_last_termination_times_ms); | |
1288 | |
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1289 double parallel_other_time = _cur_collection_par_time_ms - |
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1290 (update_rs_time + ext_root_scan_time + mark_stack_scan_time + |
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1291 scan_rs_time + obj_copy_time + termination_time); |
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1292 if (update_stats) { |
342 | 1293 MainBodySummary* body_summary = summary->main_body_summary(); |
1294 guarantee(body_summary != NULL, "should not be null!"); | |
1295 | |
1296 if (_satb_drain_time_set) | |
1297 body_summary->record_satb_drain_time_ms(_cur_satb_drain_time_ms); | |
1298 else | |
1299 body_summary->record_satb_drain_time_ms(0.0); | |
1300 body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); | |
1301 body_summary->record_mark_stack_scan_time_ms(mark_stack_scan_time); | |
1302 body_summary->record_update_rs_time_ms(update_rs_time); | |
1303 body_summary->record_scan_rs_time_ms(scan_rs_time); | |
1304 body_summary->record_obj_copy_time_ms(obj_copy_time); | |
1305 if (parallel) { | |
1306 body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); | |
1307 body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); | |
1308 body_summary->record_termination_time_ms(termination_time); | |
1309 body_summary->record_parallel_other_time_ms(parallel_other_time); | |
1310 } | |
1311 body_summary->record_mark_closure_time_ms(_mark_closure_time_ms); | |
1312 } | |
1313 | |
1314 if (G1PolicyVerbose > 1) { | |
1315 gclog_or_tty->print_cr(" ET: %10.6f ms (avg: %10.6f ms)\n" | |
1316 " CH Strong: %10.6f ms (avg: %10.6f ms)\n" | |
1317 " G1 Strong: %10.6f ms (avg: %10.6f ms)\n" | |
1318 " Evac: %10.6f ms (avg: %10.6f ms)\n" | |
1319 " ET-RS: %10.6f ms (avg: %10.6f ms)\n" | |
1320 " |RS|: " SIZE_FORMAT, | |
1321 elapsed_ms, recent_avg_time_for_pauses_ms(), | |
1322 _cur_CH_strong_roots_dur_ms, recent_avg_time_for_CH_strong_ms(), | |
1323 _cur_G1_strong_roots_dur_ms, recent_avg_time_for_G1_strong_ms(), | |
1324 evac_ms, recent_avg_time_for_evac_ms(), | |
1325 scan_rs_time, | |
1326 recent_avg_time_for_pauses_ms() - | |
1327 recent_avg_time_for_G1_strong_ms(), | |
1328 rs_size); | |
1329 | |
1330 gclog_or_tty->print_cr(" Used at start: " SIZE_FORMAT"K" | |
1331 " At end " SIZE_FORMAT "K\n" | |
1332 " garbage : " SIZE_FORMAT "K" | |
1333 " of " SIZE_FORMAT "K\n" | |
1334 " survival : %6.2f%% (%6.2f%% avg)", | |
1335 _cur_collection_pause_used_at_start_bytes/K, | |
1336 _g1->used()/K, freed_bytes/K, | |
1337 _collection_set_bytes_used_before/K, | |
1338 survival_fraction*100.0, | |
1339 recent_avg_survival_fraction()*100.0); | |
1340 gclog_or_tty->print_cr(" Recent %% gc pause time: %6.2f", | |
1341 recent_avg_pause_time_ratio() * 100.0); | |
1342 } | |
1343 | |
1344 double other_time_ms = elapsed_ms; | |
1345 | |
1707 | 1346 if (_satb_drain_time_set) { |
1347 other_time_ms -= _cur_satb_drain_time_ms; | |
1348 } | |
1349 | |
1350 if (parallel) { | |
1351 other_time_ms -= _cur_collection_par_time_ms + _cur_clear_ct_time_ms; | |
1352 } else { | |
1353 other_time_ms -= | |
1354 update_rs_time + | |
1355 ext_root_scan_time + mark_stack_scan_time + | |
1356 scan_rs_time + obj_copy_time; | |
342 | 1357 } |
1358 | |
1359 if (PrintGCDetails) { | |
1707 | 1360 gclog_or_tty->print_cr("%s, %1.8lf secs]", |
342 | 1361 (last_pause_included_initial_mark) ? " (initial-mark)" : "", |
1362 elapsed_ms / 1000.0); | |
1363 | |
1707 | 1364 if (_satb_drain_time_set) { |
1365 print_stats(1, "SATB Drain Time", _cur_satb_drain_time_ms); | |
1366 } | |
1367 if (_last_satb_drain_processed_buffers >= 0) { | |
1368 print_stats(2, "Processed Buffers", _last_satb_drain_processed_buffers); | |
1369 } | |
1370 if (parallel) { | |
1371 print_stats(1, "Parallel Time", _cur_collection_par_time_ms); | |
1372 print_par_stats(2, "GC Worker Start Time", | |
1373 _par_last_gc_worker_start_times_ms, false); | |
1374 print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); | |
1375 print_par_sizes(3, "Processed Buffers", | |
1376 _par_last_update_rs_processed_buffers, true); | |
1377 print_par_stats(2, "Ext Root Scanning", | |
1378 _par_last_ext_root_scan_times_ms); | |
1379 print_par_stats(2, "Mark Stack Scanning", | |
1380 _par_last_mark_stack_scan_times_ms); | |
1381 print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms); | |
1382 print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms); | |
1383 print_par_stats(2, "Termination", _par_last_termination_times_ms); | |
1384 print_par_sizes(3, "Termination Attempts", | |
1385 _par_last_termination_attempts, true); | |
1386 print_par_stats(2, "GC Worker End Time", | |
1387 _par_last_gc_worker_end_times_ms, false); | |
1388 print_stats(2, "Other", parallel_other_time); | |
1389 print_stats(1, "Clear CT", _cur_clear_ct_time_ms); | |
1390 } else { | |
1391 print_stats(1, "Update RS", update_rs_time); | |
1392 print_stats(2, "Processed Buffers", | |
1393 (int)update_rs_processed_buffers); | |
1394 print_stats(1, "Ext Root Scanning", ext_root_scan_time); | |
1395 print_stats(1, "Mark Stack Scanning", mark_stack_scan_time); | |
1396 print_stats(1, "Scan RS", scan_rs_time); | |
1397 print_stats(1, "Object Copying", obj_copy_time); | |
342 | 1398 } |
890
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1399 #ifndef PRODUCT |
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1400 print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms); |
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1401 print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms); |
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1402 print_stats(1, "Min Clear CC", _min_clear_cc_time_ms); |
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1403 print_stats(1, "Max Clear CC", _max_clear_cc_time_ms); |
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1404 if (_num_cc_clears > 0) { |
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1405 print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears)); |
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1406 } |
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1407 #endif |
342 | 1408 print_stats(1, "Other", other_time_ms); |
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1409 print_stats(2, "Choose CSet", _recorded_young_cset_choice_time_ms); |
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1410 |
342 | 1411 for (int i = 0; i < _aux_num; ++i) { |
1412 if (_cur_aux_times_set[i]) { | |
1413 char buffer[96]; | |
1414 sprintf(buffer, "Aux%d", i); | |
1415 print_stats(1, buffer, _cur_aux_times_ms[i]); | |
1416 } | |
1417 } | |
1418 } | |
1419 if (PrintGCDetails) | |
1420 gclog_or_tty->print(" ["); | |
1421 if (PrintGC || PrintGCDetails) | |
1422 _g1->print_size_transition(gclog_or_tty, | |
1423 _cur_collection_pause_used_at_start_bytes, | |
1424 _g1->used(), _g1->capacity()); | |
1425 if (PrintGCDetails) | |
1426 gclog_or_tty->print_cr("]"); | |
1427 | |
1428 _all_pause_times_ms->add(elapsed_ms); | |
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1429 if (update_stats) { |
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1430 summary->record_total_time_ms(elapsed_ms); |
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1431 summary->record_other_time_ms(other_time_ms); |
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1432 } |
342 | 1433 for (int i = 0; i < _aux_num; ++i) |
1434 if (_cur_aux_times_set[i]) | |
1435 _all_aux_times_ms[i].add(_cur_aux_times_ms[i]); | |
1436 | |
1437 // Reset marks-between-pauses counter. | |
1438 _n_marks_since_last_pause = 0; | |
1439 | |
1440 // Update the efficiency-since-mark vars. | |
1441 double proc_ms = elapsed_ms * (double) _parallel_gc_threads; | |
1442 if (elapsed_ms < MIN_TIMER_GRANULARITY) { | |
1443 // This usually happens due to the timer not having the required | |
1444 // granularity. Some Linuxes are the usual culprits. | |
1445 // We'll just set it to something (arbitrarily) small. | |
1446 proc_ms = 1.0; | |
1447 } | |
1448 double cur_efficiency = (double) freed_bytes / proc_ms; | |
1449 | |
1450 bool new_in_marking_window = _in_marking_window; | |
1451 bool new_in_marking_window_im = false; | |
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1452 if (during_initial_mark_pause()) { |
342 | 1453 new_in_marking_window = true; |
1454 new_in_marking_window_im = true; | |
1455 } | |
1456 | |
1457 if (in_young_gc_mode()) { | |
1458 if (_last_full_young_gc) { | |
1459 set_full_young_gcs(false); | |
1460 _last_full_young_gc = false; | |
1461 } | |
1462 | |
1463 if ( !_last_young_gc_full ) { | |
1464 if ( _should_revert_to_full_young_gcs || | |
1465 _known_garbage_ratio < 0.05 || | |
1466 (adaptive_young_list_length() && | |
1467 (get_gc_eff_factor() * cur_efficiency < predict_young_gc_eff())) ) { | |
1468 set_full_young_gcs(true); | |
1469 } | |
1470 } | |
1471 _should_revert_to_full_young_gcs = false; | |
1472 | |
1473 if (_last_young_gc_full && !_during_marking) | |
1474 _young_gc_eff_seq->add(cur_efficiency); | |
1475 } | |
1476 | |
1477 _short_lived_surv_rate_group->start_adding_regions(); | |
1478 // do that for any other surv rate groupsx | |
1479 | |
1480 // <NEW PREDICTION> | |
1481 | |
677 | 1482 if (update_stats) { |
342 | 1483 double pause_time_ms = elapsed_ms; |
1484 | |
1485 size_t diff = 0; | |
1486 if (_max_pending_cards >= _pending_cards) | |
1487 diff = _max_pending_cards - _pending_cards; | |
1488 _pending_card_diff_seq->add((double) diff); | |
1489 | |
1490 double cost_per_card_ms = 0.0; | |
1491 if (_pending_cards > 0) { | |
1492 cost_per_card_ms = update_rs_time / (double) _pending_cards; | |
1493 _cost_per_card_ms_seq->add(cost_per_card_ms); | |
1494 } | |
1495 | |
1496 size_t cards_scanned = _g1->cards_scanned(); | |
1497 | |
1498 double cost_per_entry_ms = 0.0; | |
1499 if (cards_scanned > 10) { | |
1500 cost_per_entry_ms = scan_rs_time / (double) cards_scanned; | |
1501 if (_last_young_gc_full) | |
1502 _cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1503 else | |
1504 _partially_young_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1505 } | |
1506 | |
1507 if (_max_rs_lengths > 0) { | |
1508 double cards_per_entry_ratio = | |
1509 (double) cards_scanned / (double) _max_rs_lengths; | |
1510 if (_last_young_gc_full) | |
1511 _fully_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1512 else | |
1513 _partially_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1514 } | |
1515 | |
1516 size_t rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; | |
1517 if (rs_length_diff >= 0) | |
1518 _rs_length_diff_seq->add((double) rs_length_diff); | |
1519 | |
1520 size_t copied_bytes = surviving_bytes; | |
1521 double cost_per_byte_ms = 0.0; | |
1522 if (copied_bytes > 0) { | |
1523 cost_per_byte_ms = obj_copy_time / (double) copied_bytes; | |
1524 if (_in_marking_window) | |
1525 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); | |
1526 else | |
1527 _cost_per_byte_ms_seq->add(cost_per_byte_ms); | |
1528 } | |
1529 | |
1530 double all_other_time_ms = pause_time_ms - | |
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1531 (update_rs_time + scan_rs_time + obj_copy_time + |
342 | 1532 _mark_closure_time_ms + termination_time); |
1533 | |
1534 double young_other_time_ms = 0.0; | |
1535 if (_recorded_young_regions > 0) { | |
1536 young_other_time_ms = | |
1537 _recorded_young_cset_choice_time_ms + | |
1538 _recorded_young_free_cset_time_ms; | |
1539 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / | |
1540 (double) _recorded_young_regions); | |
1541 } | |
1542 double non_young_other_time_ms = 0.0; | |
1543 if (_recorded_non_young_regions > 0) { | |
1544 non_young_other_time_ms = | |
1545 _recorded_non_young_cset_choice_time_ms + | |
1546 _recorded_non_young_free_cset_time_ms; | |
1547 | |
1548 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
1549 (double) _recorded_non_young_regions); | |
1550 } | |
1551 | |
1552 double constant_other_time_ms = all_other_time_ms - | |
1553 (young_other_time_ms + non_young_other_time_ms); | |
1554 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
1555 | |
1556 double survival_ratio = 0.0; | |
1557 if (_bytes_in_collection_set_before_gc > 0) { | |
1558 survival_ratio = (double) bytes_in_to_space_during_gc() / | |
1559 (double) _bytes_in_collection_set_before_gc; | |
1560 } | |
1561 | |
1562 _pending_cards_seq->add((double) _pending_cards); | |
1563 _scanned_cards_seq->add((double) cards_scanned); | |
1564 _rs_lengths_seq->add((double) _max_rs_lengths); | |
1565 | |
1566 double expensive_region_limit_ms = | |
751 | 1567 (double) MaxGCPauseMillis - predict_constant_other_time_ms(); |
342 | 1568 if (expensive_region_limit_ms < 0.0) { |
1569 // this means that the other time was predicted to be longer than | |
1570 // than the max pause time | |
751 | 1571 expensive_region_limit_ms = (double) MaxGCPauseMillis; |
342 | 1572 } |
1573 _expensive_region_limit_ms = expensive_region_limit_ms; | |
1574 | |
1575 if (PREDICTIONS_VERBOSE) { | |
1576 gclog_or_tty->print_cr(""); | |
1577 gclog_or_tty->print_cr("PREDICTIONS %1.4lf %d " | |
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1578 "REGIONS %d %d %d " |
342 | 1579 "PENDING_CARDS %d %d " |
1580 "CARDS_SCANNED %d %d " | |
1581 "RS_LENGTHS %d %d " | |
1582 "RS_UPDATE %1.6lf %1.6lf RS_SCAN %1.6lf %1.6lf " | |
1583 "SURVIVAL_RATIO %1.6lf %1.6lf " | |
1584 "OBJECT_COPY %1.6lf %1.6lf OTHER_CONSTANT %1.6lf %1.6lf " | |
1585 "OTHER_YOUNG %1.6lf %1.6lf " | |
1586 "OTHER_NON_YOUNG %1.6lf %1.6lf " | |
1587 "VTIME_DIFF %1.6lf TERMINATION %1.6lf " | |
1588 "ELAPSED %1.6lf %1.6lf ", | |
1589 _cur_collection_start_sec, | |
1590 (!_last_young_gc_full) ? 2 : | |
1591 (last_pause_included_initial_mark) ? 1 : 0, | |
1592 _recorded_region_num, | |
1593 _recorded_young_regions, | |
1594 _recorded_non_young_regions, | |
1595 _predicted_pending_cards, _pending_cards, | |
1596 _predicted_cards_scanned, cards_scanned, | |
1597 _predicted_rs_lengths, _max_rs_lengths, | |
1598 _predicted_rs_update_time_ms, update_rs_time, | |
1599 _predicted_rs_scan_time_ms, scan_rs_time, | |
1600 _predicted_survival_ratio, survival_ratio, | |
1601 _predicted_object_copy_time_ms, obj_copy_time, | |
1602 _predicted_constant_other_time_ms, constant_other_time_ms, | |
1603 _predicted_young_other_time_ms, young_other_time_ms, | |
1604 _predicted_non_young_other_time_ms, | |
1605 non_young_other_time_ms, | |
1606 _vtime_diff_ms, termination_time, | |
1607 _predicted_pause_time_ms, elapsed_ms); | |
1608 } | |
1609 | |
1610 if (G1PolicyVerbose > 0) { | |
1611 gclog_or_tty->print_cr("Pause Time, predicted: %1.4lfms (predicted %s), actual: %1.4lfms", | |
1612 _predicted_pause_time_ms, | |
1613 (_within_target) ? "within" : "outside", | |
1614 elapsed_ms); | |
1615 } | |
1616 | |
1617 } | |
1618 | |
1619 _in_marking_window = new_in_marking_window; | |
1620 _in_marking_window_im = new_in_marking_window_im; | |
1621 _free_regions_at_end_of_collection = _g1->free_regions(); | |
1622 calculate_young_list_min_length(); | |
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1623 calculate_young_list_target_length(); |
342 | 1624 |
1111 | 1625 // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
1282 | 1626 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
1111 | 1627 adjust_concurrent_refinement(update_rs_time, update_rs_processed_buffers, update_rs_time_goal_ms); |
342 | 1628 // </NEW PREDICTION> |
1629 } | |
1630 | |
1631 // <NEW PREDICTION> | |
1632 | |
1111 | 1633 void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
1634 double update_rs_processed_buffers, | |
1635 double goal_ms) { | |
1636 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
1637 ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); | |
1638 | |
1282 | 1639 if (G1UseAdaptiveConcRefinement) { |
1111 | 1640 const int k_gy = 3, k_gr = 6; |
1641 const double inc_k = 1.1, dec_k = 0.9; | |
1642 | |
1643 int g = cg1r->green_zone(); | |
1644 if (update_rs_time > goal_ms) { | |
1645 g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. | |
1646 } else { | |
1647 if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { | |
1648 g = (int)MAX2(g * inc_k, g + 1.0); | |
1649 } | |
1650 } | |
1651 // Change the refinement threads params | |
1652 cg1r->set_green_zone(g); | |
1653 cg1r->set_yellow_zone(g * k_gy); | |
1654 cg1r->set_red_zone(g * k_gr); | |
1655 cg1r->reinitialize_threads(); | |
1656 | |
1657 int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); | |
1658 int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, | |
1659 cg1r->yellow_zone()); | |
1660 // Change the barrier params | |
1661 dcqs.set_process_completed_threshold(processing_threshold); | |
1662 dcqs.set_max_completed_queue(cg1r->red_zone()); | |
1663 } | |
1664 | |
1665 int curr_queue_size = dcqs.completed_buffers_num(); | |
1666 if (curr_queue_size >= cg1r->yellow_zone()) { | |
1667 dcqs.set_completed_queue_padding(curr_queue_size); | |
1668 } else { | |
1669 dcqs.set_completed_queue_padding(0); | |
1670 } | |
1671 dcqs.notify_if_necessary(); | |
1672 } | |
1673 | |
342 | 1674 double |
1675 G1CollectorPolicy:: | |
1676 predict_young_collection_elapsed_time_ms(size_t adjustment) { | |
1677 guarantee( adjustment == 0 || adjustment == 1, "invariant" ); | |
1678 | |
1679 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
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1680 size_t young_num = g1h->young_list()->length(); |
342 | 1681 if (young_num == 0) |
1682 return 0.0; | |
1683 | |
1684 young_num += adjustment; | |
1685 size_t pending_cards = predict_pending_cards(); | |
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1686 size_t rs_lengths = g1h->young_list()->sampled_rs_lengths() + |
342 | 1687 predict_rs_length_diff(); |
1688 size_t card_num; | |
1689 if (full_young_gcs()) | |
1690 card_num = predict_young_card_num(rs_lengths); | |
1691 else | |
1692 card_num = predict_non_young_card_num(rs_lengths); | |
1693 size_t young_byte_size = young_num * HeapRegion::GrainBytes; | |
1694 double accum_yg_surv_rate = | |
1695 _short_lived_surv_rate_group->accum_surv_rate(adjustment); | |
1696 | |
1697 size_t bytes_to_copy = | |
1698 (size_t) (accum_yg_surv_rate * (double) HeapRegion::GrainBytes); | |
1699 | |
1700 return | |
1701 predict_rs_update_time_ms(pending_cards) + | |
1702 predict_rs_scan_time_ms(card_num) + | |
1703 predict_object_copy_time_ms(bytes_to_copy) + | |
1704 predict_young_other_time_ms(young_num) + | |
1705 predict_constant_other_time_ms(); | |
1706 } | |
1707 | |
1708 double | |
1709 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { | |
1710 size_t rs_length = predict_rs_length_diff(); | |
1711 size_t card_num; | |
1712 if (full_young_gcs()) | |
1713 card_num = predict_young_card_num(rs_length); | |
1714 else | |
1715 card_num = predict_non_young_card_num(rs_length); | |
1716 return predict_base_elapsed_time_ms(pending_cards, card_num); | |
1717 } | |
1718 | |
1719 double | |
1720 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
1721 size_t scanned_cards) { | |
1722 return | |
1723 predict_rs_update_time_ms(pending_cards) + | |
1724 predict_rs_scan_time_ms(scanned_cards) + | |
1725 predict_constant_other_time_ms(); | |
1726 } | |
1727 | |
1728 double | |
1729 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
1730 bool young) { | |
1731 size_t rs_length = hr->rem_set()->occupied(); | |
1732 size_t card_num; | |
1733 if (full_young_gcs()) | |
1734 card_num = predict_young_card_num(rs_length); | |
1735 else | |
1736 card_num = predict_non_young_card_num(rs_length); | |
1737 size_t bytes_to_copy = predict_bytes_to_copy(hr); | |
1738 | |
1739 double region_elapsed_time_ms = | |
1740 predict_rs_scan_time_ms(card_num) + | |
1741 predict_object_copy_time_ms(bytes_to_copy); | |
1742 | |
1743 if (young) | |
1744 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
1745 else | |
1746 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
1747 | |
1748 return region_elapsed_time_ms; | |
1749 } | |
1750 | |
1751 size_t | |
1752 G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { | |
1753 size_t bytes_to_copy; | |
1754 if (hr->is_marked()) | |
1755 bytes_to_copy = hr->max_live_bytes(); | |
1756 else { | |
1757 guarantee( hr->is_young() && hr->age_in_surv_rate_group() != -1, | |
1758 "invariant" ); | |
1759 int age = hr->age_in_surv_rate_group(); | |
545 | 1760 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
342 | 1761 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
1762 } | |
1763 | |
1764 return bytes_to_copy; | |
1765 } | |
1766 | |
1767 void | |
1768 G1CollectorPolicy::start_recording_regions() { | |
1769 _recorded_rs_lengths = 0; | |
1770 _recorded_young_regions = 0; | |
1771 _recorded_non_young_regions = 0; | |
1772 | |
1773 #if PREDICTIONS_VERBOSE | |
1774 _recorded_marked_bytes = 0; | |
1775 _recorded_young_bytes = 0; | |
1776 _predicted_bytes_to_copy = 0; | |
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1777 _predicted_rs_lengths = 0; |
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1778 _predicted_cards_scanned = 0; |
342 | 1779 #endif // PREDICTIONS_VERBOSE |
1780 } | |
1781 | |
1782 void | |
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1783 G1CollectorPolicy::record_cset_region_info(HeapRegion* hr, bool young) { |
342 | 1784 #if PREDICTIONS_VERBOSE |
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1785 if (!young) { |
342 | 1786 _recorded_marked_bytes += hr->max_live_bytes(); |
1787 } | |
1788 _predicted_bytes_to_copy += predict_bytes_to_copy(hr); | |
1789 #endif // PREDICTIONS_VERBOSE | |
1790 | |
1791 size_t rs_length = hr->rem_set()->occupied(); | |
1792 _recorded_rs_lengths += rs_length; | |
1793 } | |
1794 | |
1795 void | |
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1796 G1CollectorPolicy::record_non_young_cset_region(HeapRegion* hr) { |
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1797 assert(!hr->is_young(), "should not call this"); |
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1798 ++_recorded_non_young_regions; |
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1799 record_cset_region_info(hr, false); |
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1800 } |
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1801 |
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1802 void |
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1803 G1CollectorPolicy::set_recorded_young_regions(size_t n_regions) { |
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1804 _recorded_young_regions = n_regions; |
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1805 } |
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1806 |
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1807 void G1CollectorPolicy::set_recorded_young_bytes(size_t bytes) { |
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1808 #if PREDICTIONS_VERBOSE |
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1809 _recorded_young_bytes = bytes; |
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1810 #endif // PREDICTIONS_VERBOSE |
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1811 } |
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1812 |
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1813 void G1CollectorPolicy::set_recorded_rs_lengths(size_t rs_lengths) { |
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1814 _recorded_rs_lengths = rs_lengths; |
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1815 } |
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1816 |
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1817 void G1CollectorPolicy::set_predicted_bytes_to_copy(size_t bytes) { |
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1818 _predicted_bytes_to_copy = bytes; |
342 | 1819 } |
1820 | |
1821 void | |
1822 G1CollectorPolicy::end_recording_regions() { | |
1394
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1823 // The _predicted_pause_time_ms field is referenced in code |
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1824 // not under PREDICTIONS_VERBOSE. Let's initialize it. |
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1825 _predicted_pause_time_ms = -1.0; |
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1826 |
342 | 1827 #if PREDICTIONS_VERBOSE |
1828 _predicted_pending_cards = predict_pending_cards(); | |
1829 _predicted_rs_lengths = _recorded_rs_lengths + predict_rs_length_diff(); | |
1830 if (full_young_gcs()) | |
1831 _predicted_cards_scanned += predict_young_card_num(_predicted_rs_lengths); | |
1832 else | |
1833 _predicted_cards_scanned += | |
1834 predict_non_young_card_num(_predicted_rs_lengths); | |
1835 _recorded_region_num = _recorded_young_regions + _recorded_non_young_regions; | |
1836 | |
1837 _predicted_rs_update_time_ms = | |
1838 predict_rs_update_time_ms(_g1->pending_card_num()); | |
1839 _predicted_rs_scan_time_ms = | |
1840 predict_rs_scan_time_ms(_predicted_cards_scanned); | |
1841 _predicted_object_copy_time_ms = | |
1842 predict_object_copy_time_ms(_predicted_bytes_to_copy); | |
1843 _predicted_constant_other_time_ms = | |
1844 predict_constant_other_time_ms(); | |
1845 _predicted_young_other_time_ms = | |
1846 predict_young_other_time_ms(_recorded_young_regions); | |
1847 _predicted_non_young_other_time_ms = | |
1848 predict_non_young_other_time_ms(_recorded_non_young_regions); | |
1849 | |
1850 _predicted_pause_time_ms = | |
1851 _predicted_rs_update_time_ms + | |
1852 _predicted_rs_scan_time_ms + | |
1853 _predicted_object_copy_time_ms + | |
1854 _predicted_constant_other_time_ms + | |
1855 _predicted_young_other_time_ms + | |
1856 _predicted_non_young_other_time_ms; | |
1857 #endif // PREDICTIONS_VERBOSE | |
1858 } | |
1859 | |
1860 void G1CollectorPolicy::check_if_region_is_too_expensive(double | |
1861 predicted_time_ms) { | |
1862 // I don't think we need to do this when in young GC mode since | |
1863 // marking will be initiated next time we hit the soft limit anyway... | |
1864 if (predicted_time_ms > _expensive_region_limit_ms) { | |
1865 if (!in_young_gc_mode()) { | |
1866 set_full_young_gcs(true); | |
1359
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1867 // We might want to do something different here. However, |
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1868 // right now we don't support the non-generational G1 mode |
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1869 // (and in fact we are planning to remove the associated code, |
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1870 // see CR 6814390). So, let's leave it as is and this will be |
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1871 // removed some time in the future |
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1872 ShouldNotReachHere(); |
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1873 set_during_initial_mark_pause(); |
342 | 1874 } else |
1875 // no point in doing another partial one | |
1876 _should_revert_to_full_young_gcs = true; | |
1877 } | |
1878 } | |
1879 | |
1880 // </NEW PREDICTION> | |
1881 | |
1882 | |
1883 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, | |
1884 double elapsed_ms) { | |
1885 _recent_gc_times_ms->add(elapsed_ms); | |
1886 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
1887 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
1888 } | |
1889 | |
1890 double G1CollectorPolicy::recent_avg_time_for_pauses_ms() { | |
751 | 1891 if (_recent_pause_times_ms->num() == 0) return (double) MaxGCPauseMillis; |
342 | 1892 else return _recent_pause_times_ms->avg(); |
1893 } | |
1894 | |
1895 double G1CollectorPolicy::recent_avg_time_for_CH_strong_ms() { | |
1896 if (_recent_CH_strong_roots_times_ms->num() == 0) | |
751 | 1897 return (double)MaxGCPauseMillis/3.0; |
342 | 1898 else return _recent_CH_strong_roots_times_ms->avg(); |
1899 } | |
1900 | |
1901 double G1CollectorPolicy::recent_avg_time_for_G1_strong_ms() { | |
1902 if (_recent_G1_strong_roots_times_ms->num() == 0) | |
751 | 1903 return (double)MaxGCPauseMillis/3.0; |
342 | 1904 else return _recent_G1_strong_roots_times_ms->avg(); |
1905 } | |
1906 | |
1907 double G1CollectorPolicy::recent_avg_time_for_evac_ms() { | |
751 | 1908 if (_recent_evac_times_ms->num() == 0) return (double)MaxGCPauseMillis/3.0; |
342 | 1909 else return _recent_evac_times_ms->avg(); |
1910 } | |
1911 | |
1912 int G1CollectorPolicy::number_of_recent_gcs() { | |
1913 assert(_recent_CH_strong_roots_times_ms->num() == | |
1914 _recent_G1_strong_roots_times_ms->num(), "Sequence out of sync"); | |
1915 assert(_recent_G1_strong_roots_times_ms->num() == | |
1916 _recent_evac_times_ms->num(), "Sequence out of sync"); | |
1917 assert(_recent_evac_times_ms->num() == | |
1918 _recent_pause_times_ms->num(), "Sequence out of sync"); | |
1919 assert(_recent_pause_times_ms->num() == | |
1920 _recent_CS_bytes_used_before->num(), "Sequence out of sync"); | |
1921 assert(_recent_CS_bytes_used_before->num() == | |
1922 _recent_CS_bytes_surviving->num(), "Sequence out of sync"); | |
1923 return _recent_pause_times_ms->num(); | |
1924 } | |
1925 | |
1926 double G1CollectorPolicy::recent_avg_survival_fraction() { | |
1927 return recent_avg_survival_fraction_work(_recent_CS_bytes_surviving, | |
1928 _recent_CS_bytes_used_before); | |
1929 } | |
1930 | |
1931 double G1CollectorPolicy::last_survival_fraction() { | |
1932 return last_survival_fraction_work(_recent_CS_bytes_surviving, | |
1933 _recent_CS_bytes_used_before); | |
1934 } | |
1935 | |
1936 double | |
1937 G1CollectorPolicy::recent_avg_survival_fraction_work(TruncatedSeq* surviving, | |
1938 TruncatedSeq* before) { | |
1939 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
1940 if (before->sum() > 0.0) { | |
1941 double recent_survival_rate = surviving->sum() / before->sum(); | |
1942 // We exempt parallel collection from this check because Alloc Buffer | |
1943 // fragmentation can produce negative collections. | |
1944 // Further, we're now always doing parallel collection. But I'm still | |
1945 // leaving this here as a placeholder for a more precise assertion later. | |
1946 // (DLD, 10/05.) | |
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1947 assert((true || G1CollectedHeap::use_parallel_gc_threads()) || |
342 | 1948 _g1->evacuation_failed() || |
1949 recent_survival_rate <= 1.0, "Or bad frac"); | |
1950 return recent_survival_rate; | |
1951 } else { | |
1952 return 1.0; // Be conservative. | |
1953 } | |
1954 } | |
1955 | |
1956 double | |
1957 G1CollectorPolicy::last_survival_fraction_work(TruncatedSeq* surviving, | |
1958 TruncatedSeq* before) { | |
1959 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
1960 if (surviving->num() > 0 && before->last() > 0.0) { | |
1961 double last_survival_rate = surviving->last() / before->last(); | |
1962 // We exempt parallel collection from this check because Alloc Buffer | |
1963 // fragmentation can produce negative collections. | |
1964 // Further, we're now always doing parallel collection. But I'm still | |
1965 // leaving this here as a placeholder for a more precise assertion later. | |
1966 // (DLD, 10/05.) | |
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1967 assert((true || G1CollectedHeap::use_parallel_gc_threads()) || |
342 | 1968 last_survival_rate <= 1.0, "Or bad frac"); |
1969 return last_survival_rate; | |
1970 } else { | |
1971 return 1.0; | |
1972 } | |
1973 } | |
1974 | |
1975 static const int survival_min_obs = 5; | |
1976 static double survival_min_obs_limits[] = { 0.9, 0.7, 0.5, 0.3, 0.1 }; | |
1977 static const double min_survival_rate = 0.1; | |
1978 | |
1979 double | |
1980 G1CollectorPolicy::conservative_avg_survival_fraction_work(double avg, | |
1981 double latest) { | |
1982 double res = avg; | |
1983 if (number_of_recent_gcs() < survival_min_obs) { | |
1984 res = MAX2(res, survival_min_obs_limits[number_of_recent_gcs()]); | |
1985 } | |
1986 res = MAX2(res, latest); | |
1987 res = MAX2(res, min_survival_rate); | |
1988 // In the parallel case, LAB fragmentation can produce "negative | |
1989 // collections"; so can evac failure. Cap at 1.0 | |
1990 res = MIN2(res, 1.0); | |
1991 return res; | |
1992 } | |
1993 | |
1994 size_t G1CollectorPolicy::expansion_amount() { | |
1356 | 1995 if ((recent_avg_pause_time_ratio() * 100.0) > _gc_overhead_perc) { |
751 | 1996 // We will double the existing space, or take |
1997 // G1ExpandByPercentOfAvailable % of the available expansion | |
1998 // space, whichever is smaller, bounded below by a minimum | |
1999 // expansion (unless that's all that's left.) | |
342 | 2000 const size_t min_expand_bytes = 1*M; |
2001 size_t reserved_bytes = _g1->g1_reserved_obj_bytes(); | |
2002 size_t committed_bytes = _g1->capacity(); | |
2003 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
2004 size_t expand_bytes; | |
2005 size_t expand_bytes_via_pct = | |
751 | 2006 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
342 | 2007 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
2008 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
2009 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
2010 if (G1PolicyVerbose > 1) { | |
2011 gclog_or_tty->print("Decided to expand: ratio = %5.2f, " | |
2012 "committed = %d%s, uncommited = %d%s, via pct = %d%s.\n" | |
2013 " Answer = %d.\n", | |
2014 recent_avg_pause_time_ratio(), | |
2015 byte_size_in_proper_unit(committed_bytes), | |
2016 proper_unit_for_byte_size(committed_bytes), | |
2017 byte_size_in_proper_unit(uncommitted_bytes), | |
2018 proper_unit_for_byte_size(uncommitted_bytes), | |
2019 byte_size_in_proper_unit(expand_bytes_via_pct), | |
2020 proper_unit_for_byte_size(expand_bytes_via_pct), | |
2021 byte_size_in_proper_unit(expand_bytes), | |
2022 proper_unit_for_byte_size(expand_bytes)); | |
2023 } | |
2024 return expand_bytes; | |
2025 } else { | |
2026 return 0; | |
2027 } | |
2028 } | |
2029 | |
2030 void G1CollectorPolicy::note_start_of_mark_thread() { | |
2031 _mark_thread_startup_sec = os::elapsedTime(); | |
2032 } | |
2033 | |
2034 class CountCSClosure: public HeapRegionClosure { | |
2035 G1CollectorPolicy* _g1_policy; | |
2036 public: | |
2037 CountCSClosure(G1CollectorPolicy* g1_policy) : | |
2038 _g1_policy(g1_policy) {} | |
2039 bool doHeapRegion(HeapRegion* r) { | |
2040 _g1_policy->_bytes_in_collection_set_before_gc += r->used(); | |
2041 return false; | |
2042 } | |
2043 }; | |
2044 | |
2045 void G1CollectorPolicy::count_CS_bytes_used() { | |
2046 CountCSClosure cs_closure(this); | |
2047 _g1->collection_set_iterate(&cs_closure); | |
2048 } | |
2049 | |
2050 static void print_indent(int level) { | |
2051 for (int j = 0; j < level+1; ++j) | |
2052 gclog_or_tty->print(" "); | |
2053 } | |
2054 | |
2055 void G1CollectorPolicy::print_summary (int level, | |
2056 const char* str, | |
2057 NumberSeq* seq) const { | |
2058 double sum = seq->sum(); | |
2059 print_indent(level); | |
2060 gclog_or_tty->print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", | |
2061 str, sum / 1000.0, seq->avg()); | |
2062 } | |
2063 | |
2064 void G1CollectorPolicy::print_summary_sd (int level, | |
2065 const char* str, | |
2066 NumberSeq* seq) const { | |
2067 print_summary(level, str, seq); | |
2068 print_indent(level + 5); | |
2069 gclog_or_tty->print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", | |
2070 seq->num(), seq->sd(), seq->maximum()); | |
2071 } | |
2072 | |
2073 void G1CollectorPolicy::check_other_times(int level, | |
2074 NumberSeq* other_times_ms, | |
2075 NumberSeq* calc_other_times_ms) const { | |
2076 bool should_print = false; | |
2077 | |
2078 double max_sum = MAX2(fabs(other_times_ms->sum()), | |
2079 fabs(calc_other_times_ms->sum())); | |
2080 double min_sum = MIN2(fabs(other_times_ms->sum()), | |
2081 fabs(calc_other_times_ms->sum())); | |
2082 double sum_ratio = max_sum / min_sum; | |
2083 if (sum_ratio > 1.1) { | |
2084 should_print = true; | |
2085 print_indent(level + 1); | |
2086 gclog_or_tty->print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); | |
2087 } | |
2088 | |
2089 double max_avg = MAX2(fabs(other_times_ms->avg()), | |
2090 fabs(calc_other_times_ms->avg())); | |
2091 double min_avg = MIN2(fabs(other_times_ms->avg()), | |
2092 fabs(calc_other_times_ms->avg())); | |
2093 double avg_ratio = max_avg / min_avg; | |
2094 if (avg_ratio > 1.1) { | |
2095 should_print = true; | |
2096 print_indent(level + 1); | |
2097 gclog_or_tty->print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); | |
2098 } | |
2099 | |
2100 if (other_times_ms->sum() < -0.01) { | |
2101 print_indent(level + 1); | |
2102 gclog_or_tty->print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); | |
2103 } | |
2104 | |
2105 if (other_times_ms->avg() < -0.01) { | |
2106 print_indent(level + 1); | |
2107 gclog_or_tty->print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); | |
2108 } | |
2109 | |
2110 if (calc_other_times_ms->sum() < -0.01) { | |
2111 should_print = true; | |
2112 print_indent(level + 1); | |
2113 gclog_or_tty->print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); | |
2114 } | |
2115 | |
2116 if (calc_other_times_ms->avg() < -0.01) { | |
2117 should_print = true; | |
2118 print_indent(level + 1); | |
2119 gclog_or_tty->print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); | |
2120 } | |
2121 | |
2122 if (should_print) | |
2123 print_summary(level, "Other(Calc)", calc_other_times_ms); | |
2124 } | |
2125 | |
2126 void G1CollectorPolicy::print_summary(PauseSummary* summary) const { | |
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2127 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
342 | 2128 MainBodySummary* body_summary = summary->main_body_summary(); |
2129 if (summary->get_total_seq()->num() > 0) { | |
677 | 2130 print_summary_sd(0, "Evacuation Pauses", summary->get_total_seq()); |
342 | 2131 if (body_summary != NULL) { |
2132 print_summary(1, "SATB Drain", body_summary->get_satb_drain_seq()); | |
2133 if (parallel) { | |
2134 print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); | |
2135 print_summary(2, "Update RS", body_summary->get_update_rs_seq()); | |
2136 print_summary(2, "Ext Root Scanning", | |
2137 body_summary->get_ext_root_scan_seq()); | |
2138 print_summary(2, "Mark Stack Scanning", | |
2139 body_summary->get_mark_stack_scan_seq()); | |
2140 print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); | |
2141 print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); | |
2142 print_summary(2, "Termination", body_summary->get_termination_seq()); | |
2143 print_summary(2, "Other", body_summary->get_parallel_other_seq()); | |
2144 { | |
2145 NumberSeq* other_parts[] = { | |
2146 body_summary->get_update_rs_seq(), | |
2147 body_summary->get_ext_root_scan_seq(), | |
2148 body_summary->get_mark_stack_scan_seq(), | |
2149 body_summary->get_scan_rs_seq(), | |
2150 body_summary->get_obj_copy_seq(), | |
2151 body_summary->get_termination_seq() | |
2152 }; | |
2153 NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), | |
1779 | 2154 6, other_parts); |
342 | 2155 check_other_times(2, body_summary->get_parallel_other_seq(), |
2156 &calc_other_times_ms); | |
2157 } | |
2158 print_summary(1, "Mark Closure", body_summary->get_mark_closure_seq()); | |
2159 print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); | |
2160 } else { | |
2161 print_summary(1, "Update RS", body_summary->get_update_rs_seq()); | |
2162 print_summary(1, "Ext Root Scanning", | |
2163 body_summary->get_ext_root_scan_seq()); | |
2164 print_summary(1, "Mark Stack Scanning", | |
2165 body_summary->get_mark_stack_scan_seq()); | |
2166 print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); | |
2167 print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); | |
2168 } | |
2169 } | |
2170 print_summary(1, "Other", summary->get_other_seq()); | |
2171 { | |
1779 | 2172 if (body_summary != NULL) { |
2173 NumberSeq calc_other_times_ms; | |
2174 if (parallel) { | |
2175 // parallel | |
2176 NumberSeq* other_parts[] = { | |
2177 body_summary->get_satb_drain_seq(), | |
2178 body_summary->get_parallel_seq(), | |
2179 body_summary->get_clear_ct_seq() | |
2180 }; | |
2181 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
2182 3, other_parts); | |
2183 } else { | |
2184 // serial | |
2185 NumberSeq* other_parts[] = { | |
2186 body_summary->get_satb_drain_seq(), | |
2187 body_summary->get_update_rs_seq(), | |
2188 body_summary->get_ext_root_scan_seq(), | |
2189 body_summary->get_mark_stack_scan_seq(), | |
2190 body_summary->get_scan_rs_seq(), | |
2191 body_summary->get_obj_copy_seq() | |
2192 }; | |
2193 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
2194 6, other_parts); | |
2195 } | |
2196 check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); | |
342 | 2197 } |
2198 } | |
2199 } else { | |
2200 print_indent(0); | |
2201 gclog_or_tty->print_cr("none"); | |
2202 } | |
2203 gclog_or_tty->print_cr(""); | |
2204 } | |
2205 | |
2206 void G1CollectorPolicy::print_tracing_info() const { | |
2207 if (TraceGen0Time) { | |
2208 gclog_or_tty->print_cr("ALL PAUSES"); | |
2209 print_summary_sd(0, "Total", _all_pause_times_ms); | |
2210 gclog_or_tty->print_cr(""); | |
2211 gclog_or_tty->print_cr(""); | |
2212 gclog_or_tty->print_cr(" Full Young GC Pauses: %8d", _full_young_pause_num); | |
2213 gclog_or_tty->print_cr(" Partial Young GC Pauses: %8d", _partial_young_pause_num); | |
2214 gclog_or_tty->print_cr(""); | |
2215 | |
677 | 2216 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
2217 print_summary(_summary); | |
342 | 2218 |
2219 gclog_or_tty->print_cr("MISC"); | |
2220 print_summary_sd(0, "Stop World", _all_stop_world_times_ms); | |
2221 print_summary_sd(0, "Yields", _all_yield_times_ms); | |
2222 for (int i = 0; i < _aux_num; ++i) { | |
2223 if (_all_aux_times_ms[i].num() > 0) { | |
2224 char buffer[96]; | |
2225 sprintf(buffer, "Aux%d", i); | |
2226 print_summary_sd(0, buffer, &_all_aux_times_ms[i]); | |
2227 } | |
2228 } | |
2229 | |
2230 size_t all_region_num = _region_num_young + _region_num_tenured; | |
2231 gclog_or_tty->print_cr(" New Regions %8d, Young %8d (%6.2lf%%), " | |
2232 "Tenured %8d (%6.2lf%%)", | |
2233 all_region_num, | |
2234 _region_num_young, | |
2235 (double) _region_num_young / (double) all_region_num * 100.0, | |
2236 _region_num_tenured, | |
2237 (double) _region_num_tenured / (double) all_region_num * 100.0); | |
2238 } | |
2239 if (TraceGen1Time) { | |
2240 if (_all_full_gc_times_ms->num() > 0) { | |
2241 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", | |
2242 _all_full_gc_times_ms->num(), | |
2243 _all_full_gc_times_ms->sum() / 1000.0); | |
2244 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); | |
2245 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", | |
2246 _all_full_gc_times_ms->sd(), | |
2247 _all_full_gc_times_ms->maximum()); | |
2248 } | |
2249 } | |
2250 } | |
2251 | |
2252 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
2253 #ifndef PRODUCT | |
2254 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
2255 // add this call for any other surv rate groups | |
2256 #endif // PRODUCT | |
2257 } | |
2258 | |
2259 bool | |
2260 G1CollectorPolicy::should_add_next_region_to_young_list() { | |
2261 assert(in_young_gc_mode(), "should be in young GC mode"); | |
2262 bool ret; | |
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2263 size_t young_list_length = _g1->young_list()->length(); |
545 | 2264 size_t young_list_max_length = _young_list_target_length; |
2265 if (G1FixedEdenSize) { | |
2266 young_list_max_length -= _max_survivor_regions; | |
2267 } | |
2268 if (young_list_length < young_list_max_length) { | |
342 | 2269 ret = true; |
2270 ++_region_num_young; | |
2271 } else { | |
2272 ret = false; | |
2273 ++_region_num_tenured; | |
2274 } | |
2275 | |
2276 return ret; | |
2277 } | |
2278 | |
2279 #ifndef PRODUCT | |
2280 // for debugging, bit of a hack... | |
2281 static char* | |
2282 region_num_to_mbs(int length) { | |
2283 static char buffer[64]; | |
2284 double bytes = (double) (length * HeapRegion::GrainBytes); | |
2285 double mbs = bytes / (double) (1024 * 1024); | |
2286 sprintf(buffer, "%7.2lfMB", mbs); | |
2287 return buffer; | |
2288 } | |
2289 #endif // PRODUCT | |
2290 | |
545 | 2291 size_t G1CollectorPolicy::max_regions(int purpose) { |
342 | 2292 switch (purpose) { |
2293 case GCAllocForSurvived: | |
545 | 2294 return _max_survivor_regions; |
342 | 2295 case GCAllocForTenured: |
545 | 2296 return REGIONS_UNLIMITED; |
342 | 2297 default: |
545 | 2298 ShouldNotReachHere(); |
2299 return REGIONS_UNLIMITED; | |
342 | 2300 }; |
2301 } | |
2302 | |
545 | 2303 // Calculates survivor space parameters. |
2304 void G1CollectorPolicy::calculate_survivors_policy() | |
2305 { | |
2306 if (G1FixedSurvivorSpaceSize == 0) { | |
2307 _max_survivor_regions = _young_list_target_length / SurvivorRatio; | |
2308 } else { | |
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2309 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
545 | 2310 } |
2311 | |
2312 if (G1FixedTenuringThreshold) { | |
2313 _tenuring_threshold = MaxTenuringThreshold; | |
2314 } else { | |
2315 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( | |
2316 HeapRegion::GrainWords * _max_survivor_regions); | |
2317 } | |
2318 } | |
2319 | |
342 | 2320 bool |
2321 G1CollectorPolicy_BestRegionsFirst::should_do_collection_pause(size_t | |
2322 word_size) { | |
2323 assert(_g1->regions_accounted_for(), "Region leakage!"); | |
2324 double max_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; | |
2325 | |
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2326 size_t young_list_length = _g1->young_list()->length(); |
545 | 2327 size_t young_list_max_length = _young_list_target_length; |
2328 if (G1FixedEdenSize) { | |
2329 young_list_max_length -= _max_survivor_regions; | |
2330 } | |
2331 bool reached_target_length = young_list_length >= young_list_max_length; | |
342 | 2332 |
2333 if (in_young_gc_mode()) { | |
2334 if (reached_target_length) { | |
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2335 assert( young_list_length > 0 && _g1->young_list()->length() > 0, |
342 | 2336 "invariant" ); |
2337 return true; | |
2338 } | |
2339 } else { | |
2340 guarantee( false, "should not reach here" ); | |
2341 } | |
2342 | |
2343 return false; | |
2344 } | |
2345 | |
2346 #ifndef PRODUCT | |
2347 class HRSortIndexIsOKClosure: public HeapRegionClosure { | |
2348 CollectionSetChooser* _chooser; | |
2349 public: | |
2350 HRSortIndexIsOKClosure(CollectionSetChooser* chooser) : | |
2351 _chooser(chooser) {} | |
2352 | |
2353 bool doHeapRegion(HeapRegion* r) { | |
2354 if (!r->continuesHumongous()) { | |
2355 assert(_chooser->regionProperlyOrdered(r), "Ought to be."); | |
2356 } | |
2357 return false; | |
2358 } | |
2359 }; | |
2360 | |
2361 bool G1CollectorPolicy_BestRegionsFirst::assertMarkedBytesDataOK() { | |
2362 HRSortIndexIsOKClosure cl(_collectionSetChooser); | |
2363 _g1->heap_region_iterate(&cl); | |
2364 return true; | |
2365 } | |
2366 #endif | |
2367 | |
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2368 bool |
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2369 G1CollectorPolicy::force_initial_mark_if_outside_cycle() { |
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2370 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2371 if (!during_cycle) { |
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2372 set_initiate_conc_mark_if_possible(); |
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2373 return true; |
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2374 } else { |
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2375 return false; |
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2376 } |
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2377 } |
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2378 |
342 | 2379 void |
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2380 G1CollectorPolicy::decide_on_conc_mark_initiation() { |
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2381 // We are about to decide on whether this pause will be an |
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2382 // initial-mark pause. |
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2383 |
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2384 // First, during_initial_mark_pause() should not be already set. We |
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2385 // will set it here if we have to. However, it should be cleared by |
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2386 // the end of the pause (it's only set for the duration of an |
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2387 // initial-mark pause). |
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2388 assert(!during_initial_mark_pause(), "pre-condition"); |
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2389 |
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2390 if (initiate_conc_mark_if_possible()) { |
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2391 // We had noticed on a previous pause that the heap occupancy has |
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2392 // gone over the initiating threshold and we should start a |
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2393 // concurrent marking cycle. So we might initiate one. |
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2394 |
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2395 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2396 if (!during_cycle) { |
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2397 // The concurrent marking thread is not "during a cycle", i.e., |
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2398 // it has completed the last one. So we can go ahead and |
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2399 // initiate a new cycle. |
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2400 |
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2401 set_during_initial_mark_pause(); |
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2402 |
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2403 // And we can now clear initiate_conc_mark_if_possible() as |
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2404 // we've already acted on it. |
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2405 clear_initiate_conc_mark_if_possible(); |
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2406 } else { |
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2407 // The concurrent marking thread is still finishing up the |
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2408 // previous cycle. If we start one right now the two cycles |
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2409 // overlap. In particular, the concurrent marking thread might |
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2410 // be in the process of clearing the next marking bitmap (which |
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2411 // we will use for the next cycle if we start one). Starting a |
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2412 // cycle now will be bad given that parts of the marking |
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2413 // information might get cleared by the marking thread. And we |
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2414 // cannot wait for the marking thread to finish the cycle as it |
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2415 // periodically yields while clearing the next marking bitmap |
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2416 // and, if it's in a yield point, it's waiting for us to |
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2417 // finish. So, at this point we will not start a cycle and we'll |
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2418 // let the concurrent marking thread complete the last one. |
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2419 } |
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2420 } |
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2421 } |
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2422 |
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2423 void |
342 | 2424 G1CollectorPolicy_BestRegionsFirst:: |
2425 record_collection_pause_start(double start_time_sec, size_t start_used) { | |
2426 G1CollectorPolicy::record_collection_pause_start(start_time_sec, start_used); | |
2427 } | |
2428 | |
2429 class NextNonCSElemFinder: public HeapRegionClosure { | |
2430 HeapRegion* _res; | |
2431 public: | |
2432 NextNonCSElemFinder(): _res(NULL) {} | |
2433 bool doHeapRegion(HeapRegion* r) { | |
2434 if (!r->in_collection_set()) { | |
2435 _res = r; | |
2436 return true; | |
2437 } else { | |
2438 return false; | |
2439 } | |
2440 } | |
2441 HeapRegion* res() { return _res; } | |
2442 }; | |
2443 | |
2444 class KnownGarbageClosure: public HeapRegionClosure { | |
2445 CollectionSetChooser* _hrSorted; | |
2446 | |
2447 public: | |
2448 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
2449 _hrSorted(hrSorted) | |
2450 {} | |
2451 | |
2452 bool doHeapRegion(HeapRegion* r) { | |
2453 // We only include humongous regions in collection | |
2454 // sets when concurrent mark shows that their contained object is | |
2455 // unreachable. | |
2456 | |
2457 // Do we have any marking information for this region? | |
2458 if (r->is_marked()) { | |
2459 // We don't include humongous regions in collection | |
2460 // sets because we collect them immediately at the end of a marking | |
2461 // cycle. We also don't include young regions because we *must* | |
2462 // include them in the next collection pause. | |
2463 if (!r->isHumongous() && !r->is_young()) { | |
2464 _hrSorted->addMarkedHeapRegion(r); | |
2465 } | |
2466 } | |
2467 return false; | |
2468 } | |
2469 }; | |
2470 | |
2471 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
2472 CollectionSetChooser* _hrSorted; | |
2473 jint _marked_regions_added; | |
2474 jint _chunk_size; | |
2475 jint _cur_chunk_idx; | |
2476 jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) | |
2477 int _worker; | |
2478 int _invokes; | |
2479 | |
2480 void get_new_chunk() { | |
2481 _cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size); | |
2482 _cur_chunk_end = _cur_chunk_idx + _chunk_size; | |
2483 } | |
2484 void add_region(HeapRegion* r) { | |
2485 if (_cur_chunk_idx == _cur_chunk_end) { | |
2486 get_new_chunk(); | |
2487 } | |
2488 assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); | |
2489 _hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r); | |
2490 _marked_regions_added++; | |
2491 _cur_chunk_idx++; | |
2492 } | |
2493 | |
2494 public: | |
2495 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
2496 jint chunk_size, | |
2497 int worker) : | |
2498 _hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker), | |
2499 _marked_regions_added(0), _cur_chunk_idx(0), _cur_chunk_end(0), | |
2500 _invokes(0) | |
2501 {} | |
2502 | |
2503 bool doHeapRegion(HeapRegion* r) { | |
2504 // We only include humongous regions in collection | |
2505 // sets when concurrent mark shows that their contained object is | |
2506 // unreachable. | |
2507 _invokes++; | |
2508 | |
2509 // Do we have any marking information for this region? | |
2510 if (r->is_marked()) { | |
2511 // We don't include humongous regions in collection | |
2512 // sets because we collect them immediately at the end of a marking | |
2513 // cycle. | |
2514 // We also do not include young regions in collection sets | |
2515 if (!r->isHumongous() && !r->is_young()) { | |
2516 add_region(r); | |
2517 } | |
2518 } | |
2519 return false; | |
2520 } | |
2521 jint marked_regions_added() { return _marked_regions_added; } | |
2522 int invokes() { return _invokes; } | |
2523 }; | |
2524 | |
2525 class ParKnownGarbageTask: public AbstractGangTask { | |
2526 CollectionSetChooser* _hrSorted; | |
2527 jint _chunk_size; | |
2528 G1CollectedHeap* _g1; | |
2529 public: | |
2530 ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) : | |
2531 AbstractGangTask("ParKnownGarbageTask"), | |
2532 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
2533 _g1(G1CollectedHeap::heap()) | |
2534 {} | |
2535 | |
2536 void work(int i) { | |
2537 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size, i); | |
2538 // Back to zero for the claim value. | |
355 | 2539 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, i, |
2540 HeapRegion::InitialClaimValue); | |
342 | 2541 jint regions_added = parKnownGarbageCl.marked_regions_added(); |
2542 _hrSorted->incNumMarkedHeapRegions(regions_added); | |
2543 if (G1PrintParCleanupStats) { | |
2544 gclog_or_tty->print(" Thread %d called %d times, added %d regions to list.\n", | |
2545 i, parKnownGarbageCl.invokes(), regions_added); | |
2546 } | |
2547 } | |
2548 }; | |
2549 | |
2550 void | |
2551 G1CollectorPolicy_BestRegionsFirst:: | |
2552 record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
2553 size_t max_live_bytes) { | |
2554 double start; | |
2555 if (G1PrintParCleanupStats) start = os::elapsedTime(); | |
2556 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
2557 | |
2558 _collectionSetChooser->clearMarkedHeapRegions(); | |
2559 double clear_marked_end; | |
2560 if (G1PrintParCleanupStats) { | |
2561 clear_marked_end = os::elapsedTime(); | |
2562 gclog_or_tty->print_cr(" clear marked regions + work1: %8.3f ms.", | |
2563 (clear_marked_end - start)*1000.0); | |
2564 } | |
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2565 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 2566 const size_t OverpartitionFactor = 4; |
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2567 const size_t MinWorkUnit = 8; |
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2568 const size_t WorkUnit = |
342 | 2569 MAX2(_g1->n_regions() / (ParallelGCThreads * OverpartitionFactor), |
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2570 MinWorkUnit); |
342 | 2571 _collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(), |
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2572 WorkUnit); |
342 | 2573 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
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2574 (int) WorkUnit); |
342 | 2575 _g1->workers()->run_task(&parKnownGarbageTask); |
355 | 2576 |
2577 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2578 "sanity check"); | |
342 | 2579 } else { |
2580 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
2581 _g1->heap_region_iterate(&knownGarbagecl); | |
2582 } | |
2583 double known_garbage_end; | |
2584 if (G1PrintParCleanupStats) { | |
2585 known_garbage_end = os::elapsedTime(); | |
2586 gclog_or_tty->print_cr(" compute known garbage: %8.3f ms.", | |
2587 (known_garbage_end - clear_marked_end)*1000.0); | |
2588 } | |
2589 _collectionSetChooser->sortMarkedHeapRegions(); | |
2590 double sort_end; | |
2591 if (G1PrintParCleanupStats) { | |
2592 sort_end = os::elapsedTime(); | |
2593 gclog_or_tty->print_cr(" sorting: %8.3f ms.", | |
2594 (sort_end - known_garbage_end)*1000.0); | |
2595 } | |
2596 | |
2597 record_concurrent_mark_cleanup_end_work2(); | |
2598 double work2_end; | |
2599 if (G1PrintParCleanupStats) { | |
2600 work2_end = os::elapsedTime(); | |
2601 gclog_or_tty->print_cr(" work2: %8.3f ms.", | |
2602 (work2_end - sort_end)*1000.0); | |
2603 } | |
2604 } | |
2605 | |
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2606 // Add the heap region at the head of the non-incremental collection set |
342 | 2607 void G1CollectorPolicy:: |
2608 add_to_collection_set(HeapRegion* hr) { | |
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2609 assert(_inc_cset_build_state == Active, "Precondition"); |
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2610 assert(!hr->is_young(), "non-incremental add of young region"); |
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2611 |
1282 | 2612 if (G1PrintHeapRegions) { |
1388 | 2613 gclog_or_tty->print_cr("added region to cset " |
2614 "%d:["PTR_FORMAT", "PTR_FORMAT"], " | |
2615 "top "PTR_FORMAT", %s", | |
2616 hr->hrs_index(), hr->bottom(), hr->end(), | |
2617 hr->top(), hr->is_young() ? "YOUNG" : "NOT_YOUNG"); | |
342 | 2618 } |
2619 | |
2620 if (_g1->mark_in_progress()) | |
2621 _g1->concurrent_mark()->registerCSetRegion(hr); | |
2622 | |
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2623 assert(!hr->in_collection_set(), "should not already be in the CSet"); |
342 | 2624 hr->set_in_collection_set(true); |
2625 hr->set_next_in_collection_set(_collection_set); | |
2626 _collection_set = hr; | |
2627 _collection_set_size++; | |
2628 _collection_set_bytes_used_before += hr->used(); | |
526 | 2629 _g1->register_region_with_in_cset_fast_test(hr); |
342 | 2630 } |
2631 | |
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2632 // Initialize the per-collection-set information |
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2633 void G1CollectorPolicy::start_incremental_cset_building() { |
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2634 assert(_inc_cset_build_state == Inactive, "Precondition"); |
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2635 |
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2636 _inc_cset_head = NULL; |
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2637 _inc_cset_tail = NULL; |
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2638 _inc_cset_size = 0; |
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2639 _inc_cset_bytes_used_before = 0; |
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2640 |
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2641 if (in_young_gc_mode()) { |
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2642 _inc_cset_young_index = 0; |
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2643 } |
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2644 |
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2645 _inc_cset_max_finger = 0; |
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2646 _inc_cset_recorded_young_bytes = 0; |
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2647 _inc_cset_recorded_rs_lengths = 0; |
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2648 _inc_cset_predicted_elapsed_time_ms = 0; |
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2649 _inc_cset_predicted_bytes_to_copy = 0; |
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2650 _inc_cset_build_state = Active; |
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2651 } |
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2652 |
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2653 void G1CollectorPolicy::add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length) { |
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2654 // This routine is used when: |
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2655 // * adding survivor regions to the incremental cset at the end of an |
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2656 // evacuation pause, |
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2657 // * adding the current allocation region to the incremental cset |
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2658 // when it is retired, and |
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2659 // * updating existing policy information for a region in the |
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2660 // incremental cset via young list RSet sampling. |
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2661 // Therefore this routine may be called at a safepoint by the |
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2662 // VM thread, or in-between safepoints by mutator threads (when |
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2663 // retiring the current allocation region) or a concurrent |
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2664 // refine thread (RSet sampling). |
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2665 |
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2666 double region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, true); |
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2667 size_t used_bytes = hr->used(); |
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2668 |
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2669 _inc_cset_recorded_rs_lengths += rs_length; |
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2670 _inc_cset_predicted_elapsed_time_ms += region_elapsed_time_ms; |
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2671 |
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2672 _inc_cset_bytes_used_before += used_bytes; |
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2673 |
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2674 // Cache the values we have added to the aggregated informtion |
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2675 // in the heap region in case we have to remove this region from |
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2676 // the incremental collection set, or it is updated by the |
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2677 // rset sampling code |
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2678 hr->set_recorded_rs_length(rs_length); |
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2679 hr->set_predicted_elapsed_time_ms(region_elapsed_time_ms); |
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2680 |
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2681 #if PREDICTIONS_VERBOSE |
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2682 size_t bytes_to_copy = predict_bytes_to_copy(hr); |
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2683 _inc_cset_predicted_bytes_to_copy += bytes_to_copy; |
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2684 |
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2685 // Record the number of bytes used in this region |
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2686 _inc_cset_recorded_young_bytes += used_bytes; |
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2687 |
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2688 // Cache the values we have added to the aggregated informtion |
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2689 // in the heap region in case we have to remove this region from |
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2690 // the incremental collection set, or it is updated by the |
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2691 // rset sampling code |
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2692 hr->set_predicted_bytes_to_copy(bytes_to_copy); |
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2693 #endif // PREDICTIONS_VERBOSE |
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2694 } |
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2695 |
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2696 void G1CollectorPolicy::remove_from_incremental_cset_info(HeapRegion* hr) { |
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2697 // This routine is currently only called as part of the updating of |
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2698 // existing policy information for regions in the incremental cset that |
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2699 // is performed by the concurrent refine thread(s) as part of young list |
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2700 // RSet sampling. Therefore we should not be at a safepoint. |
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2701 |
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2702 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); |
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2703 assert(hr->is_young(), "it should be"); |
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2704 |
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2705 size_t used_bytes = hr->used(); |
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2706 size_t old_rs_length = hr->recorded_rs_length(); |
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2707 double old_elapsed_time_ms = hr->predicted_elapsed_time_ms(); |
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2708 |
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changeset
|
2709 // Subtract the old recorded/predicted policy information for |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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changeset
|
2710 // the given heap region from the collection set info. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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changeset
|
2711 _inc_cset_recorded_rs_lengths -= old_rs_length; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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changeset
|
2712 _inc_cset_predicted_elapsed_time_ms -= old_elapsed_time_ms; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2713 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2714 _inc_cset_bytes_used_before -= used_bytes; |
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
|
2715 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2716 // Clear the values cached in the heap region |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2717 hr->set_recorded_rs_length(0); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2718 hr->set_predicted_elapsed_time_ms(0); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2719 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2720 #if PREDICTIONS_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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changeset
|
2721 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
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parents:
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diff
changeset
|
2722 _inc_cset_predicted_bytes_to_copy -= old_predicted_bytes_to_copy; |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2723 |
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
|
2724 // Subtract the number of bytes used in this region |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2725 _inc_cset_recorded_young_bytes -= used_bytes; |
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
|
2726 |
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
|
2727 // Clear the values cached in the heap region |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2728 hr->set_predicted_bytes_to_copy(0); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2729 #endif // PREDICTIONS_VERBOSE |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2730 } |
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
|
2731 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2732 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
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parents:
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diff
changeset
|
2733 // 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
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parents:
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diff
changeset
|
2734 assert(hr->is_young(), "Precondition"); |
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
|
2735 |
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
|
2736 remove_from_incremental_cset_info(hr); |
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
|
2737 add_to_incremental_cset_info(hr, new_rs_length); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2738 } |
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
|
2739 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2740 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
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parents:
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diff
changeset
|
2741 assert( hr->is_young(), "invariant"); |
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
|
2742 assert( hr->young_index_in_cset() == -1, "invariant" ); |
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
|
2743 assert(_inc_cset_build_state == Active, "Precondition"); |
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
|
2744 |
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
|
2745 // 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
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diff
changeset
|
2746 // 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
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parents:
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diff
changeset
|
2747 // 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
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parents:
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diff
changeset
|
2748 // are calculated, aggregated with the policy collection set info, |
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
|
2749 // 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
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parents:
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diff
changeset
|
2750 // by the Young List sampling code. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2751 |
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
|
2752 size_t rs_length = hr->rem_set()->occupied(); |
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
|
2753 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:
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diff
changeset
|
2754 |
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
|
2755 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
|
2756 _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:
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diff
changeset
|
2757 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2758 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
|
2759 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
|
2760 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
|
2761 |
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
|
2762 _inc_cset_size++; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2763 _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
|
2764 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2765 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
|
2766 ++_inc_cset_young_index; |
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 // 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
|
2770 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
|
2771 // 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
|
2772 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
|
2773 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2774 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2775 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
|
2776 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2777 // 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
|
2778 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
|
2779 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
|
2780 _inc_cset_head = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2781 } else { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2782 _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
|
2783 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2784 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2785 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2786 if (G1PrintHeapRegions) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2787 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
|
2788 "%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
|
2789 "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
|
2790 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
|
2791 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
|
2792 } |
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 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2795 // 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
|
2796 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
|
2797 // 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
|
2798 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
|
2799 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2800 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2801 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
|
2802 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2803 // 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
|
2804 hr->set_next_in_collection_set(_inc_cset_head); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2805 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
|
2806 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
|
2807 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2808 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2809 _inc_cset_head = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2810 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2811 if (G1PrintHeapRegions) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2812 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
|
2813 "%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
|
2814 "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
|
2815 hr->hrs_index(), hr->bottom(), hr->end(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2816 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
|
2817 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2818 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2819 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2820 #ifndef PRODUCT |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2821 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
|
2822 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
|
2823 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2824 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
|
2825 HeapRegion* csr = list_head; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2826 while (csr != NULL) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2827 HeapRegion* next = csr->next_in_collection_set(); |
1316cec51b4d
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2828 assert(csr->in_collection_set(), "bad CS"); |
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|
2829 st->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " |
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2830 "age: %4d, y: %d, surv: %d", |
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|
2831 csr->bottom(), csr->end(), |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2832 csr->top(), |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2833 csr->prev_top_at_mark_start(), |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2834 csr->next_top_at_mark_start(), |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2835 csr->top_at_conc_mark_count(), |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2836 csr->age_in_surv_rate_group_cond(), |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2837 csr->is_young(), |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2838 csr->is_survivor()); |
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|
2839 csr = next; |
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|
2840 } |
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|
2841 } |
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|
2842 #endif // !PRODUCT |
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|
2843 |
1707 | 2844 void |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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|
2845 G1CollectorPolicy_BestRegionsFirst::choose_collection_set( |
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|
2846 double target_pause_time_ms) { |
1394
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2847 // Set this here - in case we're not doing young collections. |
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2848 double non_young_start_time_sec = os::elapsedTime(); |
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2849 |
342 | 2850 start_recording_regions(); |
2851 | |
1656
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6944166: G1: explicit GCs are not always handled correctly
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|
2852 guarantee(target_pause_time_ms > 0.0, |
4e5661ba9d98
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|
2853 err_msg("target_pause_time_ms = %1.6lf should be positive", |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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|
2854 target_pause_time_ms)); |
4e5661ba9d98
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changeset
|
2855 guarantee(_collection_set == NULL, "Precondition"); |
342 | 2856 |
2857 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
2858 double predicted_pause_time_ms = base_time_ms; | |
2859 | |
1656
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|
2860 double time_remaining_ms = target_pause_time_ms - base_time_ms; |
342 | 2861 |
2862 // the 10% and 50% values are arbitrary... | |
1656
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|
2863 if (time_remaining_ms < 0.10 * target_pause_time_ms) { |
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|
2864 time_remaining_ms = 0.50 * target_pause_time_ms; |
342 | 2865 _within_target = false; |
2866 } else { | |
2867 _within_target = true; | |
2868 } | |
2869 | |
2870 // We figure out the number of bytes available for future to-space. | |
2871 // For new regions without marking information, we must assume the | |
2872 // worst-case of complete survival. If we have marking information for a | |
2873 // region, we can bound the amount of live data. We can add a number of | |
2874 // such regions, as long as the sum of the live data bounds does not | |
2875 // exceed the available evacuation space. | |
2876 size_t max_live_bytes = _g1->free_regions() * HeapRegion::GrainBytes; | |
2877 | |
2878 size_t expansion_bytes = | |
2879 _g1->expansion_regions() * HeapRegion::GrainBytes; | |
2880 | |
677 | 2881 _collection_set_bytes_used_before = 0; |
2882 _collection_set_size = 0; | |
342 | 2883 |
2884 // Adjust for expansion and slop. | |
2885 max_live_bytes = max_live_bytes + expansion_bytes; | |
2886 | |
677 | 2887 assert(_g1->regions_accounted_for(), "Region leakage!"); |
342 | 2888 |
2889 HeapRegion* hr; | |
2890 if (in_young_gc_mode()) { | |
2891 double young_start_time_sec = os::elapsedTime(); | |
2892 | |
2893 if (G1PolicyVerbose > 0) { | |
2894 gclog_or_tty->print_cr("Adding %d young regions to the CSet", | |
1394
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2895 _g1->young_list()->length()); |
342 | 2896 } |
1394
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|
2897 |
342 | 2898 _young_cset_length = 0; |
2899 _last_young_gc_full = full_young_gcs() ? true : false; | |
1394
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|
2900 |
342 | 2901 if (_last_young_gc_full) |
2902 ++_full_young_pause_num; | |
2903 else | |
2904 ++_partial_young_pause_num; | |
1394
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|
2905 |
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|
2906 // The young list is laid with the survivor regions from the previous |
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|
2907 // pause are appended to the RHS of the young list, i.e. |
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|
2908 // [Newly Young Regions ++ Survivors from last pause]. |
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|
2909 |
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changeset
|
2910 hr = _g1->young_list()->first_survivor_region(); |
342 | 2911 while (hr != NULL) { |
1394
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2912 assert(hr->is_survivor(), "badly formed young list"); |
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|
2913 hr->set_young(); |
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diff
changeset
|
2914 hr = hr->get_next_young_region(); |
342 | 2915 } |
2916 | |
1394
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2917 // Clear the fields that point to the survivor list - they are |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2918 // all young now. |
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diff
changeset
|
2919 _g1->young_list()->clear_survivors(); |
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changeset
|
2920 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2921 if (_g1->mark_in_progress()) |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2922 _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
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diff
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|
2923 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2924 _young_cset_length = _inc_cset_young_index; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2925 _collection_set = _inc_cset_head; |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2926 _collection_set_size = _inc_cset_size; |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
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changeset
|
2927 _collection_set_bytes_used_before = _inc_cset_bytes_used_before; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2928 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2929 // 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
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1391
diff
changeset
|
2930 // case of complete survival |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2931 max_live_bytes -= _inc_cset_size * HeapRegion::GrainBytes; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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diff
changeset
|
2932 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2933 time_remaining_ms -= _inc_cset_predicted_elapsed_time_ms; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2934 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
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parents:
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diff
changeset
|
2935 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2936 // The number of recorded young regions is the incremental |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2937 // collection set's current size |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2938 set_recorded_young_regions(_inc_cset_size); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2939 set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2940 set_recorded_young_bytes(_inc_cset_recorded_young_bytes); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2941 #if PREDICTIONS_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2942 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
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1391
diff
changeset
|
2943 #endif // PREDICTIONS_VERBOSE |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2944 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2945 if (G1PolicyVerbose > 0) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2946 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
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1391
diff
changeset
|
2947 _inc_cset_size); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2948 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
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parents:
1391
diff
changeset
|
2949 max_live_bytes/K); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2950 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2951 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2952 assert(_inc_cset_size == _g1->young_list()->length(), "Invariant"); |
342 | 2953 |
2954 double young_end_time_sec = os::elapsedTime(); | |
2955 _recorded_young_cset_choice_time_ms = | |
2956 (young_end_time_sec - young_start_time_sec) * 1000.0; | |
2957 | |
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
changeset
|
2958 // We are doing young collections so reset this. |
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
|
2959 non_young_start_time_sec = young_end_time_sec; |
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
|
2960 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2961 // Note we can use either _collection_set_size or |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2962 // _young_cset_length here |
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
|
2963 if (_collection_set_size > 0 && _last_young_gc_full) { |
342 | 2964 // don't bother adding more regions... |
2965 goto choose_collection_set_end; | |
2966 } | |
2967 } | |
2968 | |
2969 if (!in_young_gc_mode() || !full_young_gcs()) { | |
2970 bool should_continue = true; | |
2971 NumberSeq seq; | |
2972 double avg_prediction = 100000000000000000.0; // something very large | |
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
changeset
|
2973 |
342 | 2974 do { |
2975 hr = _collectionSetChooser->getNextMarkedRegion(time_remaining_ms, | |
2976 avg_prediction); | |
677 | 2977 if (hr != NULL) { |
342 | 2978 double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
2979 time_remaining_ms -= predicted_time_ms; | |
2980 predicted_pause_time_ms += predicted_time_ms; | |
2981 add_to_collection_set(hr); | |
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
changeset
|
2982 record_non_young_cset_region(hr); |
342 | 2983 max_live_bytes -= MIN2(hr->max_live_bytes(), max_live_bytes); |
2984 if (G1PolicyVerbose > 0) { | |
2985 gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", | |
2986 max_live_bytes/K); | |
2987 } | |
2988 seq.add(predicted_time_ms); | |
2989 avg_prediction = seq.avg() + seq.sd(); | |
2990 } | |
2991 should_continue = | |
2992 ( hr != NULL) && | |
2993 ( (adaptive_young_list_length()) ? time_remaining_ms > 0.0 | |
2994 : _collection_set_size < _young_list_fixed_length ); | |
2995 } while (should_continue); | |
2996 | |
2997 if (!adaptive_young_list_length() && | |
2998 _collection_set_size < _young_list_fixed_length) | |
2999 _should_revert_to_full_young_gcs = true; | |
3000 } | |
3001 | |
3002 choose_collection_set_end: | |
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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|
3003 stop_incremental_cset_building(); |
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diff
changeset
|
3004 |
342 | 3005 count_CS_bytes_used(); |
3006 | |
3007 end_recording_regions(); | |
3008 | |
3009 double non_young_end_time_sec = os::elapsedTime(); | |
3010 _recorded_non_young_cset_choice_time_ms = | |
3011 (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; | |
3012 } | |
3013 | |
3014 void G1CollectorPolicy_BestRegionsFirst::record_full_collection_end() { | |
3015 G1CollectorPolicy::record_full_collection_end(); | |
3016 _collectionSetChooser->updateAfterFullCollection(); | |
3017 } | |
3018 | |
3019 void G1CollectorPolicy_BestRegionsFirst:: | |
3020 expand_if_possible(size_t numRegions) { | |
3021 size_t expansion_bytes = numRegions * HeapRegion::GrainBytes; | |
3022 _g1->expand(expansion_bytes); | |
3023 } | |
3024 | |
3025 void G1CollectorPolicy_BestRegionsFirst:: | |
1707 | 3026 record_collection_pause_end() { |
3027 G1CollectorPolicy::record_collection_pause_end(); | |
342 | 3028 assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end."); |
3029 } |