Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 1972:f95d63e2154a
6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
author | stefank |
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date | Tue, 23 Nov 2010 13:22:55 -0800 |
parents | 8b10f48633dc |
children | 631f79e71e90 |
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 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
27 #include "gc_implementation/g1/concurrentMark.hpp" | |
28 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
30 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
31 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
32 #include "gc_implementation/shared/gcPolicyCounters.hpp" | |
33 #include "runtime/arguments.hpp" | |
34 #include "runtime/java.hpp" | |
35 #include "runtime/mutexLocker.hpp" | |
36 #include "utilities/debug.hpp" | |
342 | 37 |
38 #define PREDICTIONS_VERBOSE 0 | |
39 | |
40 // <NEW PREDICTION> | |
41 | |
42 // Different defaults for different number of GC threads | |
43 // They were chosen by running GCOld and SPECjbb on debris with different | |
44 // numbers of GC threads and choosing them based on the results | |
45 | |
46 // all the same | |
47 static double rs_length_diff_defaults[] = { | |
48 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 | |
49 }; | |
50 | |
51 static double cost_per_card_ms_defaults[] = { | |
52 0.01, 0.005, 0.005, 0.003, 0.003, 0.002, 0.002, 0.0015 | |
53 }; | |
54 | |
55 // all the same | |
56 static double fully_young_cards_per_entry_ratio_defaults[] = { | |
57 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 | |
58 }; | |
59 | |
60 static double cost_per_entry_ms_defaults[] = { | |
61 0.015, 0.01, 0.01, 0.008, 0.008, 0.0055, 0.0055, 0.005 | |
62 }; | |
63 | |
64 static double cost_per_byte_ms_defaults[] = { | |
65 0.00006, 0.00003, 0.00003, 0.000015, 0.000015, 0.00001, 0.00001, 0.000009 | |
66 }; | |
67 | |
68 // these should be pretty consistent | |
69 static double constant_other_time_ms_defaults[] = { | |
70 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0 | |
71 }; | |
72 | |
73 | |
74 static double young_other_cost_per_region_ms_defaults[] = { | |
75 0.3, 0.2, 0.2, 0.15, 0.15, 0.12, 0.12, 0.1 | |
76 }; | |
77 | |
78 static double non_young_other_cost_per_region_ms_defaults[] = { | |
79 1.0, 0.7, 0.7, 0.5, 0.5, 0.42, 0.42, 0.30 | |
80 }; | |
81 | |
82 // </NEW PREDICTION> | |
83 | |
84 G1CollectorPolicy::G1CollectorPolicy() : | |
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85 _parallel_gc_threads(G1CollectedHeap::use_parallel_gc_threads() |
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86 ? ParallelGCThreads : 1), |
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87 |
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88 |
342 | 89 _n_pauses(0), |
90 _recent_CH_strong_roots_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
91 _recent_G1_strong_roots_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
92 _recent_evac_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
93 _recent_pause_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
94 _recent_rs_sizes(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
95 _recent_gc_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
96 _all_pause_times_ms(new NumberSeq()), | |
97 _stop_world_start(0.0), | |
98 _all_stop_world_times_ms(new NumberSeq()), | |
99 _all_yield_times_ms(new NumberSeq()), | |
100 | |
101 _all_mod_union_times_ms(new NumberSeq()), | |
102 | |
677 | 103 _summary(new Summary()), |
342 | 104 |
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105 #ifndef PRODUCT |
342 | 106 _cur_clear_ct_time_ms(0.0), |
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107 _min_clear_cc_time_ms(-1.0), |
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108 _max_clear_cc_time_ms(-1.0), |
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109 _cur_clear_cc_time_ms(0.0), |
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110 _cum_clear_cc_time_ms(0.0), |
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111 _num_cc_clears(0L), |
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112 #endif |
342 | 113 |
114 _region_num_young(0), | |
115 _region_num_tenured(0), | |
116 _prev_region_num_young(0), | |
117 _prev_region_num_tenured(0), | |
118 | |
119 _aux_num(10), | |
120 _all_aux_times_ms(new NumberSeq[_aux_num]), | |
121 _cur_aux_start_times_ms(new double[_aux_num]), | |
122 _cur_aux_times_ms(new double[_aux_num]), | |
123 _cur_aux_times_set(new bool[_aux_num]), | |
124 | |
125 _concurrent_mark_init_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
126 _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
127 _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
128 | |
129 // <NEW PREDICTION> | |
130 | |
131 _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
132 _prev_collection_pause_end_ms(0.0), | |
133 _pending_card_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
134 _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
135 _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
136 _fully_young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), | |
137 _partially_young_cards_per_entry_ratio_seq( | |
138 new TruncatedSeq(TruncatedSeqLength)), | |
139 _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
140 _partially_young_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
141 _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
142 _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
143 _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
144 _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
145 _non_young_other_cost_per_region_ms_seq( | |
146 new TruncatedSeq(TruncatedSeqLength)), | |
147 | |
148 _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
149 _scanned_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
150 _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), | |
151 | |
751 | 152 _pause_time_target_ms((double) MaxGCPauseMillis), |
342 | 153 |
154 // </NEW PREDICTION> | |
155 | |
156 _in_young_gc_mode(false), | |
157 _full_young_gcs(true), | |
158 _full_young_pause_num(0), | |
159 _partial_young_pause_num(0), | |
160 | |
161 _during_marking(false), | |
162 _in_marking_window(false), | |
163 _in_marking_window_im(false), | |
164 | |
165 _known_garbage_ratio(0.0), | |
166 _known_garbage_bytes(0), | |
167 | |
168 _young_gc_eff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
169 | |
170 _recent_prev_end_times_for_all_gcs_sec(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
171 | |
172 _recent_CS_bytes_used_before(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
173 _recent_CS_bytes_surviving(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
174 | |
175 _recent_avg_pause_time_ratio(0.0), | |
176 _num_markings(0), | |
177 _n_marks(0), | |
178 _n_pauses_at_mark_end(0), | |
179 | |
180 _all_full_gc_times_ms(new NumberSeq()), | |
181 | |
182 // G1PausesBtwnConcMark defaults to -1 | |
183 // so the hack is to do the cast QQQ FIXME | |
184 _pauses_btwn_concurrent_mark((size_t)G1PausesBtwnConcMark), | |
185 _n_marks_since_last_pause(0), | |
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186 _initiate_conc_mark_if_possible(false), |
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187 _during_initial_mark_pause(false), |
342 | 188 _should_revert_to_full_young_gcs(false), |
189 _last_full_young_gc(false), | |
190 | |
191 _prev_collection_pause_used_at_end_bytes(0), | |
192 | |
193 _collection_set(NULL), | |
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194 _collection_set_size(0), |
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195 _collection_set_bytes_used_before(0), |
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196 |
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197 // Incremental CSet attributes |
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198 _inc_cset_build_state(Inactive), |
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199 _inc_cset_head(NULL), |
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200 _inc_cset_tail(NULL), |
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201 _inc_cset_size(0), |
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202 _inc_cset_young_index(0), |
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203 _inc_cset_bytes_used_before(0), |
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204 _inc_cset_max_finger(NULL), |
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205 _inc_cset_recorded_young_bytes(0), |
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206 _inc_cset_recorded_rs_lengths(0), |
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207 _inc_cset_predicted_elapsed_time_ms(0.0), |
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208 _inc_cset_predicted_bytes_to_copy(0), |
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209 |
342 | 210 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
211 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
212 #endif // _MSC_VER | |
213 | |
214 _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", | |
215 G1YoungSurvRateNumRegionsSummary)), | |
216 _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", | |
545 | 217 G1YoungSurvRateNumRegionsSummary)), |
342 | 218 // add here any more surv rate groups |
545 | 219 _recorded_survivor_regions(0), |
220 _recorded_survivor_head(NULL), | |
221 _recorded_survivor_tail(NULL), | |
1356 | 222 _survivors_age_table(true), |
223 | |
224 _gc_overhead_perc(0.0) | |
545 | 225 |
342 | 226 { |
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227 // Set up the region size and associated fields. Given that the |
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228 // policy is created before the heap, we have to set this up here, |
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229 // so it's done as soon as possible. |
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230 HeapRegion::setup_heap_region_size(Arguments::min_heap_size()); |
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231 HeapRegionRemSet::setup_remset_size(); |
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232 |
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233 // Verify PLAB sizes |
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234 const uint region_size = HeapRegion::GrainWords; |
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235 if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
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236 char buffer[128]; |
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237 jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most %u", |
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238 OldPLABSize > region_size ? "Old" : "Young", region_size); |
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239 vm_exit_during_initialization(buffer); |
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240 } |
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241 |
342 | 242 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
243 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
244 | |
1611 | 245 _par_last_gc_worker_start_times_ms = new double[_parallel_gc_threads]; |
342 | 246 _par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads]; |
247 _par_last_mark_stack_scan_times_ms = new double[_parallel_gc_threads]; | |
248 | |
249 _par_last_update_rs_times_ms = new double[_parallel_gc_threads]; | |
250 _par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; | |
251 | |
252 _par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; | |
253 | |
254 _par_last_obj_copy_times_ms = new double[_parallel_gc_threads]; | |
255 | |
256 _par_last_termination_times_ms = new double[_parallel_gc_threads]; | |
1611 | 257 _par_last_termination_attempts = new double[_parallel_gc_threads]; |
258 _par_last_gc_worker_end_times_ms = new double[_parallel_gc_threads]; | |
342 | 259 |
260 // start conservatively | |
751 | 261 _expensive_region_limit_ms = 0.5 * (double) MaxGCPauseMillis; |
342 | 262 |
263 // <NEW PREDICTION> | |
264 | |
265 int index; | |
266 if (ParallelGCThreads == 0) | |
267 index = 0; | |
268 else if (ParallelGCThreads > 8) | |
269 index = 7; | |
270 else | |
271 index = ParallelGCThreads - 1; | |
272 | |
273 _pending_card_diff_seq->add(0.0); | |
274 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
275 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
276 _fully_young_cards_per_entry_ratio_seq->add( | |
277 fully_young_cards_per_entry_ratio_defaults[index]); | |
278 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); | |
279 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
280 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
281 _young_other_cost_per_region_ms_seq->add( | |
282 young_other_cost_per_region_ms_defaults[index]); | |
283 _non_young_other_cost_per_region_ms_seq->add( | |
284 non_young_other_cost_per_region_ms_defaults[index]); | |
285 | |
286 // </NEW PREDICTION> | |
287 | |
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288 // Below, we might need to calculate the pause time target based on |
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289 // the pause interval. When we do so we are going to give G1 maximum |
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290 // flexibility and allow it to do pauses when it needs to. So, we'll |
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291 // arrange that the pause interval to be pause time target + 1 to |
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292 // ensure that a) the pause time target is maximized with respect to |
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293 // the pause interval and b) we maintain the invariant that pause |
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294 // time target < pause interval. If the user does not want this |
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295 // maximum flexibility, they will have to set the pause interval |
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296 // explicitly. |
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297 |
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298 // First make sure that, if either parameter is set, its value is |
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299 // reasonable. |
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300 if (!FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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301 if (MaxGCPauseMillis < 1) { |
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302 vm_exit_during_initialization("MaxGCPauseMillis should be " |
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303 "greater than 0"); |
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304 } |
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305 } |
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306 if (!FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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307 if (GCPauseIntervalMillis < 1) { |
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308 vm_exit_during_initialization("GCPauseIntervalMillis should be " |
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309 "greater than 0"); |
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310 } |
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311 } |
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312 |
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313 // Then, if the pause time target parameter was not set, set it to |
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314 // the default value. |
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315 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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316 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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317 // The default pause time target in G1 is 200ms |
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318 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); |
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319 } else { |
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320 // We do not allow the pause interval to be set without the |
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321 // pause time target |
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322 vm_exit_during_initialization("GCPauseIntervalMillis cannot be set " |
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323 "without setting MaxGCPauseMillis"); |
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324 } |
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325 } |
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326 |
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327 // Then, if the interval parameter was not set, set it according to |
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328 // the pause time target (this will also deal with the case when the |
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329 // pause time target is the default value). |
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330 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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331 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); |
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332 } |
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333 |
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334 // Finally, make sure that the two parameters are consistent. |
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335 if (MaxGCPauseMillis >= GCPauseIntervalMillis) { |
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336 char buffer[256]; |
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337 jio_snprintf(buffer, 256, |
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338 "MaxGCPauseMillis (%u) should be less than " |
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339 "GCPauseIntervalMillis (%u)", |
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340 MaxGCPauseMillis, GCPauseIntervalMillis); |
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341 vm_exit_during_initialization(buffer); |
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342 } |
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343 |
751 | 344 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; |
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345 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
342 | 346 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); |
751 | 347 _sigma = (double) G1ConfidencePercent / 100.0; |
342 | 348 |
349 // start conservatively (around 50ms is about right) | |
350 _concurrent_mark_init_times_ms->add(0.05); | |
351 _concurrent_mark_remark_times_ms->add(0.05); | |
352 _concurrent_mark_cleanup_times_ms->add(0.20); | |
353 _tenuring_threshold = MaxTenuringThreshold; | |
354 | |
1282 | 355 // if G1FixedSurvivorSpaceSize is 0 which means the size is not |
356 // fixed, then _max_survivor_regions will be calculated at | |
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357 // calculate_young_list_target_length during initialization |
1282 | 358 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
545 | 359 |
1356 | 360 assert(GCTimeRatio > 0, |
361 "we should have set it to a default value set_g1_gc_flags() " | |
362 "if a user set it to 0"); | |
363 _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); | |
364 | |
342 | 365 initialize_all(); |
366 } | |
367 | |
368 // Increment "i", mod "len" | |
369 static void inc_mod(int& i, int len) { | |
370 i++; if (i == len) i = 0; | |
371 } | |
372 | |
373 void G1CollectorPolicy::initialize_flags() { | |
374 set_min_alignment(HeapRegion::GrainBytes); | |
375 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
547
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376 if (SurvivorRatio < 1) { |
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377 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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378 } |
342 | 379 CollectorPolicy::initialize_flags(); |
380 } | |
381 | |
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382 // The easiest way to deal with the parsing of the NewSize / |
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383 // MaxNewSize / etc. parameteres is to re-use the code in the |
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384 // TwoGenerationCollectorPolicy class. This is similar to what |
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385 // ParallelScavenge does with its GenerationSizer class (see |
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386 // ParallelScavengeHeap::initialize()). We might change this in the |
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387 // future, but it's a good start. |
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388 class G1YoungGenSizer : public TwoGenerationCollectorPolicy { |
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389 size_t size_to_region_num(size_t byte_size) { |
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390 return MAX2((size_t) 1, byte_size / HeapRegion::GrainBytes); |
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391 } |
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392 |
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393 public: |
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394 G1YoungGenSizer() { |
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395 initialize_flags(); |
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396 initialize_size_info(); |
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397 } |
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398 |
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399 size_t min_young_region_num() { |
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400 return size_to_region_num(_min_gen0_size); |
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401 } |
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402 size_t initial_young_region_num() { |
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403 return size_to_region_num(_initial_gen0_size); |
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404 } |
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405 size_t max_young_region_num() { |
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406 return size_to_region_num(_max_gen0_size); |
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407 } |
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408 }; |
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409 |
342 | 410 void G1CollectorPolicy::init() { |
411 // Set aside an initial future to_space. | |
412 _g1 = G1CollectedHeap::heap(); | |
413 | |
414 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
415 | |
545 | 416 initialize_gc_policy_counters(); |
417 | |
342 | 418 if (G1Gen) { |
419 _in_young_gc_mode = true; | |
420 | |
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421 G1YoungGenSizer sizer; |
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422 size_t initial_region_num = sizer.initial_young_region_num(); |
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423 |
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424 if (UseAdaptiveSizePolicy) { |
342 | 425 set_adaptive_young_list_length(true); |
426 _young_list_fixed_length = 0; | |
427 } else { | |
428 set_adaptive_young_list_length(false); | |
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429 _young_list_fixed_length = initial_region_num; |
342 | 430 } |
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431 _free_regions_at_end_of_collection = _g1->free_regions(); |
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432 calculate_young_list_min_length(); |
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433 guarantee( _young_list_min_length == 0, "invariant, not enough info" ); |
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434 calculate_young_list_target_length(); |
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435 } else { |
342 | 436 _young_list_fixed_length = 0; |
437 _in_young_gc_mode = false; | |
438 } | |
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439 |
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440 // We may immediately start allocating regions and placing them on the |
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441 // collection set list. Initialize the per-collection set info |
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442 start_incremental_cset_building(); |
342 | 443 } |
444 | |
545 | 445 // Create the jstat counters for the policy. |
446 void G1CollectorPolicy::initialize_gc_policy_counters() | |
447 { | |
448 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 2 + G1Gen); | |
449 } | |
450 | |
342 | 451 void G1CollectorPolicy::calculate_young_list_min_length() { |
452 _young_list_min_length = 0; | |
453 | |
454 if (!adaptive_young_list_length()) | |
455 return; | |
456 | |
457 if (_alloc_rate_ms_seq->num() > 3) { | |
458 double now_sec = os::elapsedTime(); | |
459 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; | |
460 double alloc_rate_ms = predict_alloc_rate_ms(); | |
461 int min_regions = (int) ceil(alloc_rate_ms * when_ms); | |
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462 int current_region_num = (int) _g1->young_list()->length(); |
342 | 463 _young_list_min_length = min_regions + current_region_num; |
464 } | |
465 } | |
466 | |
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467 void G1CollectorPolicy::calculate_young_list_target_length() { |
342 | 468 if (adaptive_young_list_length()) { |
469 size_t rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); | |
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470 calculate_young_list_target_length(rs_lengths); |
342 | 471 } else { |
472 if (full_young_gcs()) | |
473 _young_list_target_length = _young_list_fixed_length; | |
474 else | |
475 _young_list_target_length = _young_list_fixed_length / 2; | |
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476 |
342 | 477 _young_list_target_length = MAX2(_young_list_target_length, (size_t)1); |
478 } | |
545 | 479 calculate_survivors_policy(); |
342 | 480 } |
481 | |
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482 void G1CollectorPolicy::calculate_young_list_target_length(size_t rs_lengths) { |
342 | 483 guarantee( adaptive_young_list_length(), "pre-condition" ); |
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484 guarantee( !_in_marking_window || !_last_full_young_gc, "invariant" ); |
342 | 485 |
486 double start_time_sec = os::elapsedTime(); | |
1282 | 487 size_t min_reserve_perc = MAX2((size_t)2, (size_t)G1ReservePercent); |
342 | 488 min_reserve_perc = MIN2((size_t) 50, min_reserve_perc); |
489 size_t reserve_regions = | |
490 (size_t) ((double) min_reserve_perc * (double) _g1->n_regions() / 100.0); | |
491 | |
492 if (full_young_gcs() && _free_regions_at_end_of_collection > 0) { | |
493 // we are in fully-young mode and there are free regions in the heap | |
494 | |
545 | 495 double survivor_regions_evac_time = |
496 predict_survivor_regions_evac_time(); | |
497 | |
342 | 498 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
499 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); | |
500 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); | |
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501 size_t scanned_cards = predict_young_card_num(adj_rs_lengths); |
545 | 502 double base_time_ms = predict_base_elapsed_time_ms(pending_cards, scanned_cards) |
503 + survivor_regions_evac_time; | |
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504 |
342 | 505 // the result |
506 size_t final_young_length = 0; | |
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507 |
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508 size_t init_free_regions = |
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509 MAX2((size_t)0, _free_regions_at_end_of_collection - reserve_regions); |
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510 |
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511 // if we're still under the pause target... |
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512 if (base_time_ms <= target_pause_time_ms) { |
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513 // We make sure that the shortest young length that makes sense |
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514 // fits within the target pause time. |
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515 size_t min_young_length = 1; |
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516 |
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517 if (predict_will_fit(min_young_length, base_time_ms, |
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518 init_free_regions, target_pause_time_ms)) { |
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519 // The shortest young length will fit within the target pause time; |
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520 // we'll now check whether the absolute maximum number of young |
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521 // regions will fit in the target pause time. If not, we'll do |
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522 // a binary search between min_young_length and max_young_length |
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523 size_t abs_max_young_length = _free_regions_at_end_of_collection - 1; |
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524 size_t max_young_length = abs_max_young_length; |
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525 |
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526 if (max_young_length > min_young_length) { |
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527 // Let's check if the initial max young length will fit within the |
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528 // target pause. If so then there is no need to search for a maximal |
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529 // young length - we'll return the initial maximum |
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530 |
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531 if (predict_will_fit(max_young_length, base_time_ms, |
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532 init_free_regions, target_pause_time_ms)) { |
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533 // The maximum young length will satisfy the target pause time. |
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534 // We are done so set min young length to this maximum length. |
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535 // The code after the loop will then set final_young_length using |
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536 // the value cached in the minimum length. |
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537 min_young_length = max_young_length; |
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538 } else { |
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539 // The maximum possible number of young regions will not fit within |
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540 // the target pause time so let's search.... |
342 | 541 |
542 size_t diff = (max_young_length - min_young_length) / 2; | |
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543 max_young_length = min_young_length + diff; |
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544 |
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545 while (max_young_length > min_young_length) { |
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546 if (predict_will_fit(max_young_length, base_time_ms, |
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547 init_free_regions, target_pause_time_ms)) { |
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548 |
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549 // The current max young length will fit within the target |
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550 // pause time. Note we do not exit the loop here. By setting |
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551 // min = max, and then increasing the max below means that |
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552 // we will continue searching for an upper bound in the |
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553 // range [max..max+diff] |
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554 min_young_length = max_young_length; |
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555 } |
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556 diff = (max_young_length - min_young_length) / 2; |
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557 max_young_length = min_young_length + diff; |
342 | 558 } |
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559 // the above loop found a maximal young length that will fit |
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560 // within the target pause time. |
342 | 561 } |
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562 assert(min_young_length <= abs_max_young_length, "just checking"); |
342 | 563 } |
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564 final_young_length = min_young_length; |
342 | 565 } |
566 } | |
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567 // and we're done! |
342 | 568 |
569 // we should have at least one region in the target young length | |
545 | 570 _young_list_target_length = |
571 MAX2((size_t) 1, final_young_length + _recorded_survivor_regions); | |
342 | 572 |
573 // let's keep an eye of how long we spend on this calculation | |
574 // right now, I assume that we'll print it when we need it; we | |
575 // should really adde it to the breakdown of a pause | |
576 double end_time_sec = os::elapsedTime(); | |
577 double elapsed_time_ms = (end_time_sec - start_time_sec) * 1000.0; | |
578 | |
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579 #ifdef TRACE_CALC_YOUNG_LENGTH |
342 | 580 // leave this in for debugging, just in case |
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581 gclog_or_tty->print_cr("target = %1.1lf ms, young = " SIZE_FORMAT ", " |
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582 "elapsed %1.2lf ms, (%s%s) " SIZE_FORMAT SIZE_FORMAT, |
342 | 583 target_pause_time_ms, |
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584 _young_list_target_length |
342 | 585 elapsed_time_ms, |
586 full_young_gcs() ? "full" : "partial", | |
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587 during_initial_mark_pause() ? " i-m" : "", |
545 | 588 _in_marking_window, |
589 _in_marking_window_im); | |
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590 #endif // TRACE_CALC_YOUNG_LENGTH |
342 | 591 |
592 if (_young_list_target_length < _young_list_min_length) { | |
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593 // bummer; this means that, if we do a pause when the maximal |
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594 // length dictates, we'll violate the pause spacing target (the |
342 | 595 // min length was calculate based on the application's current |
596 // alloc rate); | |
597 | |
598 // so, we have to bite the bullet, and allocate the minimum | |
599 // number. We'll violate our target, but we just can't meet it. | |
600 | |
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601 #ifdef TRACE_CALC_YOUNG_LENGTH |
342 | 602 // leave this in for debugging, just in case |
603 gclog_or_tty->print_cr("adjusted target length from " | |
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604 SIZE_FORMAT " to " SIZE_FORMAT, |
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605 _young_list_target_length, _young_list_min_length); |
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606 #endif // TRACE_CALC_YOUNG_LENGTH |
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607 |
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608 _young_list_target_length = _young_list_min_length; |
342 | 609 } |
610 } else { | |
611 // we are in a partially-young mode or we've run out of regions (due | |
612 // to evacuation failure) | |
613 | |
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614 #ifdef TRACE_CALC_YOUNG_LENGTH |
342 | 615 // leave this in for debugging, just in case |
616 gclog_or_tty->print_cr("(partial) setting target to " SIZE_FORMAT | |
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617 _young_list_min_length); |
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618 #endif // TRACE_CALC_YOUNG_LENGTH |
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619 // we'll do the pause as soon as possible by choosing the minimum |
342 | 620 _young_list_target_length = |
621 MAX2(_young_list_min_length, (size_t) 1); | |
622 } | |
623 | |
624 _rs_lengths_prediction = rs_lengths; | |
625 } | |
626 | |
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627 // This is used by: calculate_young_list_target_length(rs_length). It |
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628 // returns true iff: |
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629 // the predicted pause time for the given young list will not overflow |
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630 // the target pause time |
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631 // and: |
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632 // the predicted amount of surviving data will not overflow the |
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633 // the amount of free space available for survivor regions. |
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634 // |
342 | 635 bool |
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636 G1CollectorPolicy::predict_will_fit(size_t young_length, |
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637 double base_time_ms, |
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638 size_t init_free_regions, |
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639 double target_pause_time_ms) { |
342 | 640 |
641 if (young_length >= init_free_regions) | |
642 // end condition 1: not enough space for the young regions | |
643 return false; | |
644 | |
645 double accum_surv_rate_adj = 0.0; | |
646 double accum_surv_rate = | |
647 accum_yg_surv_rate_pred((int)(young_length - 1)) - accum_surv_rate_adj; | |
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648 |
342 | 649 size_t bytes_to_copy = |
650 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); | |
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651 |
342 | 652 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
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653 |
342 | 654 double young_other_time_ms = |
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655 predict_young_other_time_ms(young_length); |
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656 |
342 | 657 double pause_time_ms = |
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658 base_time_ms + copy_time_ms + young_other_time_ms; |
342 | 659 |
660 if (pause_time_ms > target_pause_time_ms) | |
661 // end condition 2: over the target pause time | |
662 return false; | |
663 | |
664 size_t free_bytes = | |
665 (init_free_regions - young_length) * HeapRegion::GrainBytes; | |
666 | |
667 if ((2.0 + sigma()) * (double) bytes_to_copy > (double) free_bytes) | |
668 // end condition 3: out of to-space (conservatively) | |
669 return false; | |
670 | |
671 // success! | |
672 return true; | |
673 } | |
674 | |
545 | 675 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
676 double survivor_regions_evac_time = 0.0; | |
677 for (HeapRegion * r = _recorded_survivor_head; | |
678 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
679 r = r->get_next_young_region()) { | |
680 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); | |
681 } | |
682 return survivor_regions_evac_time; | |
683 } | |
684 | |
342 | 685 void G1CollectorPolicy::check_prediction_validity() { |
686 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); | |
687 | |
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688 size_t rs_lengths = _g1->young_list()->sampled_rs_lengths(); |
342 | 689 if (rs_lengths > _rs_lengths_prediction) { |
690 // add 10% to avoid having to recalculate often | |
691 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
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692 calculate_young_list_target_length(rs_lengths_prediction); |
342 | 693 } |
694 } | |
695 | |
696 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, | |
697 bool is_tlab, | |
698 bool* gc_overhead_limit_was_exceeded) { | |
699 guarantee(false, "Not using this policy feature yet."); | |
700 return NULL; | |
701 } | |
702 | |
703 // This method controls how a collector handles one or more | |
704 // of its generations being fully allocated. | |
705 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
706 bool is_tlab) { | |
707 guarantee(false, "Not using this policy feature yet."); | |
708 return NULL; | |
709 } | |
710 | |
711 | |
712 #ifndef PRODUCT | |
713 bool G1CollectorPolicy::verify_young_ages() { | |
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714 HeapRegion* head = _g1->young_list()->first_region(); |
342 | 715 return |
716 verify_young_ages(head, _short_lived_surv_rate_group); | |
717 // also call verify_young_ages on any additional surv rate groups | |
718 } | |
719 | |
720 bool | |
721 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
722 SurvRateGroup *surv_rate_group) { | |
723 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
724 | |
725 const char* name = surv_rate_group->name(); | |
726 bool ret = true; | |
727 int prev_age = -1; | |
728 | |
729 for (HeapRegion* curr = head; | |
730 curr != NULL; | |
731 curr = curr->get_next_young_region()) { | |
732 SurvRateGroup* group = curr->surv_rate_group(); | |
733 if (group == NULL && !curr->is_survivor()) { | |
734 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
735 ret = false; | |
736 } | |
737 | |
738 if (surv_rate_group == group) { | |
739 int age = curr->age_in_surv_rate_group(); | |
740 | |
741 if (age < 0) { | |
742 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
743 ret = false; | |
744 } | |
745 | |
746 if (age <= prev_age) { | |
747 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
748 "(%d, %d)", name, age, prev_age); | |
749 ret = false; | |
750 } | |
751 prev_age = age; | |
752 } | |
753 } | |
754 | |
755 return ret; | |
756 } | |
757 #endif // PRODUCT | |
758 | |
759 void G1CollectorPolicy::record_full_collection_start() { | |
760 _cur_collection_start_sec = os::elapsedTime(); | |
761 // Release the future to-space so that it is available for compaction into. | |
762 _g1->set_full_collection(); | |
763 } | |
764 | |
765 void G1CollectorPolicy::record_full_collection_end() { | |
766 // Consider this like a collection pause for the purposes of allocation | |
767 // since last pause. | |
768 double end_sec = os::elapsedTime(); | |
769 double full_gc_time_sec = end_sec - _cur_collection_start_sec; | |
770 double full_gc_time_ms = full_gc_time_sec * 1000.0; | |
771 | |
772 _all_full_gc_times_ms->add(full_gc_time_ms); | |
773 | |
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774 update_recent_gc_times(end_sec, full_gc_time_ms); |
342 | 775 |
776 _g1->clear_full_collection(); | |
777 | |
778 // "Nuke" the heuristics that control the fully/partially young GC | |
779 // transitions and make sure we start with fully young GCs after the | |
780 // Full GC. | |
781 set_full_young_gcs(true); | |
782 _last_full_young_gc = false; | |
783 _should_revert_to_full_young_gcs = false; | |
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784 clear_initiate_conc_mark_if_possible(); |
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785 clear_during_initial_mark_pause(); |
342 | 786 _known_garbage_bytes = 0; |
787 _known_garbage_ratio = 0.0; | |
788 _in_marking_window = false; | |
789 _in_marking_window_im = false; | |
790 | |
791 _short_lived_surv_rate_group->start_adding_regions(); | |
792 // also call this on any additional surv rate groups | |
793 | |
545 | 794 record_survivor_regions(0, NULL, NULL); |
795 | |
342 | 796 _prev_region_num_young = _region_num_young; |
797 _prev_region_num_tenured = _region_num_tenured; | |
798 | |
799 _free_regions_at_end_of_collection = _g1->free_regions(); | |
545 | 800 // Reset survivors SurvRateGroup. |
801 _survivor_surv_rate_group->reset(); | |
342 | 802 calculate_young_list_min_length(); |
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803 calculate_young_list_target_length(); |
342 | 804 } |
805 | |
806 void G1CollectorPolicy::record_before_bytes(size_t bytes) { | |
807 _bytes_in_to_space_before_gc += bytes; | |
808 } | |
809 | |
810 void G1CollectorPolicy::record_after_bytes(size_t bytes) { | |
811 _bytes_in_to_space_after_gc += bytes; | |
812 } | |
813 | |
814 void G1CollectorPolicy::record_stop_world_start() { | |
815 _stop_world_start = os::elapsedTime(); | |
816 } | |
817 | |
818 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, | |
819 size_t start_used) { | |
820 if (PrintGCDetails) { | |
821 gclog_or_tty->stamp(PrintGCTimeStamps); | |
822 gclog_or_tty->print("[GC pause"); | |
823 if (in_young_gc_mode()) | |
824 gclog_or_tty->print(" (%s)", full_young_gcs() ? "young" : "partial"); | |
825 } | |
826 | |
827 assert(_g1->used_regions() == _g1->recalculate_used_regions(), | |
828 "sanity"); | |
636 | 829 assert(_g1->used() == _g1->recalculate_used(), "sanity"); |
342 | 830 |
831 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
832 _all_stop_world_times_ms->add(s_w_t_ms); | |
833 _stop_world_start = 0.0; | |
834 | |
835 _cur_collection_start_sec = start_time_sec; | |
836 _cur_collection_pause_used_at_start_bytes = start_used; | |
837 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); | |
838 _pending_cards = _g1->pending_card_num(); | |
839 _max_pending_cards = _g1->max_pending_card_num(); | |
840 | |
841 _bytes_in_to_space_before_gc = 0; | |
842 _bytes_in_to_space_after_gc = 0; | |
843 _bytes_in_collection_set_before_gc = 0; | |
844 | |
845 #ifdef DEBUG | |
846 // initialise these to something well known so that we can spot | |
847 // if they are not set properly | |
848 | |
849 for (int i = 0; i < _parallel_gc_threads; ++i) { | |
1611 | 850 _par_last_gc_worker_start_times_ms[i] = -1234.0; |
851 _par_last_ext_root_scan_times_ms[i] = -1234.0; | |
852 _par_last_mark_stack_scan_times_ms[i] = -1234.0; | |
853 _par_last_update_rs_times_ms[i] = -1234.0; | |
854 _par_last_update_rs_processed_buffers[i] = -1234.0; | |
855 _par_last_scan_rs_times_ms[i] = -1234.0; | |
856 _par_last_obj_copy_times_ms[i] = -1234.0; | |
857 _par_last_termination_times_ms[i] = -1234.0; | |
858 _par_last_termination_attempts[i] = -1234.0; | |
859 _par_last_gc_worker_end_times_ms[i] = -1234.0; | |
342 | 860 } |
861 #endif | |
862 | |
863 for (int i = 0; i < _aux_num; ++i) { | |
864 _cur_aux_times_ms[i] = 0.0; | |
865 _cur_aux_times_set[i] = false; | |
866 } | |
867 | |
868 _satb_drain_time_set = false; | |
869 _last_satb_drain_processed_buffers = -1; | |
870 | |
871 if (in_young_gc_mode()) | |
872 _last_young_gc_full = false; | |
873 | |
874 // do that for any other surv rate groups | |
875 _short_lived_surv_rate_group->stop_adding_regions(); | |
1282 | 876 _survivors_age_table.clear(); |
545 | 877 |
342 | 878 assert( verify_young_ages(), "region age verification" ); |
879 } | |
880 | |
881 void G1CollectorPolicy::record_mark_closure_time(double mark_closure_time_ms) { | |
882 _mark_closure_time_ms = mark_closure_time_ms; | |
883 } | |
884 | |
885 void G1CollectorPolicy::record_concurrent_mark_init_start() { | |
886 _mark_init_start_sec = os::elapsedTime(); | |
887 guarantee(!in_young_gc_mode(), "should not do be here in young GC mode"); | |
888 } | |
889 | |
890 void G1CollectorPolicy::record_concurrent_mark_init_end_pre(double | |
891 mark_init_elapsed_time_ms) { | |
892 _during_marking = true; | |
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893 assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
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894 clear_during_initial_mark_pause(); |
342 | 895 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
896 } | |
897 | |
898 void G1CollectorPolicy::record_concurrent_mark_init_end() { | |
899 double end_time_sec = os::elapsedTime(); | |
900 double elapsed_time_ms = (end_time_sec - _mark_init_start_sec) * 1000.0; | |
901 _concurrent_mark_init_times_ms->add(elapsed_time_ms); | |
902 record_concurrent_mark_init_end_pre(elapsed_time_ms); | |
903 | |
904 _mmu_tracker->add_pause(_mark_init_start_sec, end_time_sec, true); | |
905 } | |
906 | |
907 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
908 _mark_remark_start_sec = os::elapsedTime(); | |
909 _during_marking = false; | |
910 } | |
911 | |
912 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
913 double end_time_sec = os::elapsedTime(); | |
914 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
915 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
916 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
917 _prev_collection_pause_end_ms += elapsed_time_ms; | |
918 | |
919 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
920 } | |
921 | |
922 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
923 _mark_cleanup_start_sec = os::elapsedTime(); | |
924 } | |
925 | |
926 void | |
927 G1CollectorPolicy::record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
928 size_t max_live_bytes) { | |
929 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
930 record_concurrent_mark_cleanup_end_work2(); | |
931 } | |
932 | |
933 void | |
934 G1CollectorPolicy:: | |
935 record_concurrent_mark_cleanup_end_work1(size_t freed_bytes, | |
936 size_t max_live_bytes) { | |
937 if (_n_marks < 2) _n_marks++; | |
938 if (G1PolicyVerbose > 0) | |
939 gclog_or_tty->print_cr("At end of marking, max_live is " SIZE_FORMAT " MB " | |
940 " (of " SIZE_FORMAT " MB heap).", | |
941 max_live_bytes/M, _g1->capacity()/M); | |
942 } | |
943 | |
944 // The important thing about this is that it includes "os::elapsedTime". | |
945 void G1CollectorPolicy::record_concurrent_mark_cleanup_end_work2() { | |
946 double end_time_sec = os::elapsedTime(); | |
947 double elapsed_time_ms = (end_time_sec - _mark_cleanup_start_sec)*1000.0; | |
948 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
949 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
950 _prev_collection_pause_end_ms += elapsed_time_ms; | |
951 | |
952 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_time_sec, true); | |
953 | |
954 _num_markings++; | |
955 | |
956 // We did a marking, so reset the "since_last_mark" variables. | |
957 double considerConcMarkCost = 1.0; | |
958 // If there are available processors, concurrent activity is free... | |
959 if (Threads::number_of_non_daemon_threads() * 2 < | |
960 os::active_processor_count()) { | |
961 considerConcMarkCost = 0.0; | |
962 } | |
963 _n_pauses_at_mark_end = _n_pauses; | |
964 _n_marks_since_last_pause++; | |
965 } | |
966 | |
967 void | |
968 G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { | |
969 if (in_young_gc_mode()) { | |
970 _should_revert_to_full_young_gcs = false; | |
971 _last_full_young_gc = true; | |
972 _in_marking_window = false; | |
973 if (adaptive_young_list_length()) | |
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974 calculate_young_list_target_length(); |
342 | 975 } |
976 } | |
977 | |
978 void G1CollectorPolicy::record_concurrent_pause() { | |
979 if (_stop_world_start > 0.0) { | |
980 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
981 _all_yield_times_ms->add(yield_ms); | |
982 } | |
983 } | |
984 | |
985 void G1CollectorPolicy::record_concurrent_pause_end() { | |
986 } | |
987 | |
988 void G1CollectorPolicy::record_collection_pause_end_CH_strong_roots() { | |
989 _cur_CH_strong_roots_end_sec = os::elapsedTime(); | |
990 _cur_CH_strong_roots_dur_ms = | |
991 (_cur_CH_strong_roots_end_sec - _cur_collection_start_sec) * 1000.0; | |
992 } | |
993 | |
994 void G1CollectorPolicy::record_collection_pause_end_G1_strong_roots() { | |
995 _cur_G1_strong_roots_end_sec = os::elapsedTime(); | |
996 _cur_G1_strong_roots_dur_ms = | |
997 (_cur_G1_strong_roots_end_sec - _cur_CH_strong_roots_end_sec) * 1000.0; | |
998 } | |
999 | |
1000 template<class T> | |
1001 T sum_of(T* sum_arr, int start, int n, int N) { | |
1002 T sum = (T)0; | |
1003 for (int i = 0; i < n; i++) { | |
1004 int j = (start + i) % N; | |
1005 sum += sum_arr[j]; | |
1006 } | |
1007 return sum; | |
1008 } | |
1009 | |
1611 | 1010 void G1CollectorPolicy::print_par_stats(int level, |
1011 const char* str, | |
1012 double* data, | |
342 | 1013 bool summary) { |
1014 double min = data[0], max = data[0]; | |
1015 double total = 0.0; | |
1016 int j; | |
1017 for (j = 0; j < level; ++j) | |
1018 gclog_or_tty->print(" "); | |
1019 gclog_or_tty->print("[%s (ms):", str); | |
1020 for (uint i = 0; i < ParallelGCThreads; ++i) { | |
1021 double val = data[i]; | |
1022 if (val < min) | |
1023 min = val; | |
1024 if (val > max) | |
1025 max = val; | |
1026 total += val; | |
1027 gclog_or_tty->print(" %3.1lf", val); | |
1028 } | |
1029 if (summary) { | |
1030 gclog_or_tty->print_cr(""); | |
1031 double avg = total / (double) ParallelGCThreads; | |
1032 gclog_or_tty->print(" "); | |
1033 for (j = 0; j < level; ++j) | |
1034 gclog_or_tty->print(" "); | |
1035 gclog_or_tty->print("Avg: %5.1lf, Min: %5.1lf, Max: %5.1lf", | |
1036 avg, min, max); | |
1037 } | |
1038 gclog_or_tty->print_cr("]"); | |
1039 } | |
1040 | |
1611 | 1041 void G1CollectorPolicy::print_par_sizes(int level, |
1042 const char* str, | |
1043 double* data, | |
1044 bool summary) { | |
342 | 1045 double min = data[0], max = data[0]; |
1046 double total = 0.0; | |
1047 int j; | |
1048 for (j = 0; j < level; ++j) | |
1049 gclog_or_tty->print(" "); | |
1050 gclog_or_tty->print("[%s :", str); | |
1051 for (uint i = 0; i < ParallelGCThreads; ++i) { | |
1052 double val = data[i]; | |
1053 if (val < min) | |
1054 min = val; | |
1055 if (val > max) | |
1056 max = val; | |
1057 total += val; | |
1058 gclog_or_tty->print(" %d", (int) val); | |
1059 } | |
1060 if (summary) { | |
1061 gclog_or_tty->print_cr(""); | |
1062 double avg = total / (double) ParallelGCThreads; | |
1063 gclog_or_tty->print(" "); | |
1064 for (j = 0; j < level; ++j) | |
1065 gclog_or_tty->print(" "); | |
1066 gclog_or_tty->print("Sum: %d, Avg: %d, Min: %d, Max: %d", | |
1067 (int)total, (int)avg, (int)min, (int)max); | |
1068 } | |
1069 gclog_or_tty->print_cr("]"); | |
1070 } | |
1071 | |
1072 void G1CollectorPolicy::print_stats (int level, | |
1073 const char* str, | |
1074 double value) { | |
1075 for (int j = 0; j < level; ++j) | |
1076 gclog_or_tty->print(" "); | |
1077 gclog_or_tty->print_cr("[%s: %5.1lf ms]", str, value); | |
1078 } | |
1079 | |
1080 void G1CollectorPolicy::print_stats (int level, | |
1081 const char* str, | |
1082 int value) { | |
1083 for (int j = 0; j < level; ++j) | |
1084 gclog_or_tty->print(" "); | |
1085 gclog_or_tty->print_cr("[%s: %d]", str, value); | |
1086 } | |
1087 | |
1088 double G1CollectorPolicy::avg_value (double* data) { | |
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1089 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1090 double ret = 0.0; |
1091 for (uint i = 0; i < ParallelGCThreads; ++i) | |
1092 ret += data[i]; | |
1093 return ret / (double) ParallelGCThreads; | |
1094 } else { | |
1095 return data[0]; | |
1096 } | |
1097 } | |
1098 | |
1099 double G1CollectorPolicy::max_value (double* data) { | |
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1100 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1101 double ret = data[0]; |
1102 for (uint i = 1; i < ParallelGCThreads; ++i) | |
1103 if (data[i] > ret) | |
1104 ret = data[i]; | |
1105 return ret; | |
1106 } else { | |
1107 return data[0]; | |
1108 } | |
1109 } | |
1110 | |
1111 double G1CollectorPolicy::sum_of_values (double* data) { | |
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1112 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1113 double sum = 0.0; |
1114 for (uint i = 0; i < ParallelGCThreads; i++) | |
1115 sum += data[i]; | |
1116 return sum; | |
1117 } else { | |
1118 return data[0]; | |
1119 } | |
1120 } | |
1121 | |
1122 double G1CollectorPolicy::max_sum (double* data1, | |
1123 double* data2) { | |
1124 double ret = data1[0] + data2[0]; | |
1125 | |
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1126 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1127 for (uint i = 1; i < ParallelGCThreads; ++i) { |
1128 double data = data1[i] + data2[i]; | |
1129 if (data > ret) | |
1130 ret = data; | |
1131 } | |
1132 } | |
1133 return ret; | |
1134 } | |
1135 | |
1136 // Anything below that is considered to be zero | |
1137 #define MIN_TIMER_GRANULARITY 0.0000001 | |
1138 | |
1707 | 1139 void G1CollectorPolicy::record_collection_pause_end() { |
342 | 1140 double end_time_sec = os::elapsedTime(); |
1141 double elapsed_ms = _last_pause_time_ms; | |
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1142 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
342 | 1143 double evac_ms = (end_time_sec - _cur_G1_strong_roots_end_sec) * 1000.0; |
1144 size_t rs_size = | |
1145 _cur_collection_pause_used_regions_at_start - collection_set_size(); | |
1146 size_t cur_used_bytes = _g1->used(); | |
1147 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
1148 bool last_pause_included_initial_mark = false; | |
1707 | 1149 bool update_stats = !_g1->evacuation_failed(); |
342 | 1150 |
1151 #ifndef PRODUCT | |
1152 if (G1YoungSurvRateVerbose) { | |
1153 gclog_or_tty->print_cr(""); | |
1154 _short_lived_surv_rate_group->print(); | |
1155 // do that for any other surv rate groups too | |
1156 } | |
1157 #endif // PRODUCT | |
1158 | |
1159 if (in_young_gc_mode()) { | |
1359
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1160 last_pause_included_initial_mark = during_initial_mark_pause(); |
342 | 1161 if (last_pause_included_initial_mark) |
1162 record_concurrent_mark_init_end_pre(0.0); | |
1163 | |
1164 size_t min_used_targ = | |
1283
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1165 (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
342 | 1166 |
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1167 |
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1168 if (!_g1->mark_in_progress() && !_last_full_young_gc) { |
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1169 assert(!last_pause_included_initial_mark, "invariant"); |
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1170 if (cur_used_bytes > min_used_targ && |
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1171 cur_used_bytes > _prev_collection_pause_used_at_end_bytes) { |
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1172 assert(!during_initial_mark_pause(), "we should not see this here"); |
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1173 |
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1174 // Note: this might have already been set, if during the last |
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1175 // pause we decided to start a cycle but at the beginning of |
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1176 // this pause we decided to postpone it. That's OK. |
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1177 set_initiate_conc_mark_if_possible(); |
342 | 1178 } |
1179 } | |
1180 | |
1181 _prev_collection_pause_used_at_end_bytes = cur_used_bytes; | |
1182 } | |
1183 | |
1184 _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0, | |
1185 end_time_sec, false); | |
1186 | |
1187 guarantee(_cur_collection_pause_used_regions_at_start >= | |
1188 collection_set_size(), | |
1189 "Negative RS size?"); | |
1190 | |
1191 // This assert is exempted when we're doing parallel collection pauses, | |
1192 // because the fragmentation caused by the parallel GC allocation buffers | |
1193 // can lead to more memory being used during collection than was used | |
1194 // before. Best leave this out until the fragmentation problem is fixed. | |
1195 // Pauses in which evacuation failed can also lead to negative | |
1196 // collections, since no space is reclaimed from a region containing an | |
1197 // object whose evacuation failed. | |
1198 // Further, we're now always doing parallel collection. But I'm still | |
1199 // leaving this here as a placeholder for a more precise assertion later. | |
1200 // (DLD, 10/05.) | |
1201 assert((true || parallel) // Always using GC LABs now. | |
1202 || _g1->evacuation_failed() | |
1203 || _cur_collection_pause_used_at_start_bytes >= cur_used_bytes, | |
1204 "Negative collection"); | |
1205 | |
1206 size_t freed_bytes = | |
1207 _cur_collection_pause_used_at_start_bytes - cur_used_bytes; | |
1208 size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; | |
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1209 |
342 | 1210 double survival_fraction = |
1211 (double)surviving_bytes/ | |
1212 (double)_collection_set_bytes_used_before; | |
1213 | |
1214 _n_pauses++; | |
1215 | |
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1216 if (update_stats) { |
342 | 1217 _recent_CH_strong_roots_times_ms->add(_cur_CH_strong_roots_dur_ms); |
1218 _recent_G1_strong_roots_times_ms->add(_cur_G1_strong_roots_dur_ms); | |
1219 _recent_evac_times_ms->add(evac_ms); | |
1220 _recent_pause_times_ms->add(elapsed_ms); | |
1221 | |
1222 _recent_rs_sizes->add(rs_size); | |
1223 | |
1224 // We exempt parallel collection from this check because Alloc Buffer | |
1225 // fragmentation can produce negative collections. Same with evac | |
1226 // failure. | |
1227 // Further, we're now always doing parallel collection. But I'm still | |
1228 // leaving this here as a placeholder for a more precise assertion later. | |
1229 // (DLD, 10/05. | |
1230 assert((true || parallel) | |
1231 || _g1->evacuation_failed() | |
1232 || surviving_bytes <= _collection_set_bytes_used_before, | |
1233 "Or else negative collection!"); | |
1234 _recent_CS_bytes_used_before->add(_collection_set_bytes_used_before); | |
1235 _recent_CS_bytes_surviving->add(surviving_bytes); | |
1236 | |
1237 // this is where we update the allocation rate of the application | |
1238 double app_time_ms = | |
1239 (_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms); | |
1240 if (app_time_ms < MIN_TIMER_GRANULARITY) { | |
1241 // This usually happens due to the timer not having the required | |
1242 // granularity. Some Linuxes are the usual culprits. | |
1243 // We'll just set it to something (arbitrarily) small. | |
1244 app_time_ms = 1.0; | |
1245 } | |
1246 size_t regions_allocated = | |
1247 (_region_num_young - _prev_region_num_young) + | |
1248 (_region_num_tenured - _prev_region_num_tenured); | |
1249 double alloc_rate_ms = (double) regions_allocated / app_time_ms; | |
1250 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
1251 _prev_region_num_young = _region_num_young; | |
1252 _prev_region_num_tenured = _region_num_tenured; | |
1253 | |
1254 double interval_ms = | |
1255 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
1256 update_recent_gc_times(end_time_sec, elapsed_ms); | |
1257 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; | |
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1258 if (recent_avg_pause_time_ratio() < 0.0 || |
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1259 (recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
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1260 #ifndef PRODUCT |
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1261 // Dump info to allow post-facto debugging |
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1262 gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
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1263 gclog_or_tty->print_cr("-------------------------------------------"); |
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1264 gclog_or_tty->print_cr("Recent GC Times (ms):"); |
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1265 _recent_gc_times_ms->dump(); |
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1266 gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
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1267 _recent_prev_end_times_for_all_gcs_sec->dump(); |
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1268 gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
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1269 _recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
1087
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1270 // In debug mode, terminate the JVM if the user wants to debug at this point. |
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1271 assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
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1272 #endif // !PRODUCT |
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1273 // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
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1274 // CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
1086
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1275 if (_recent_avg_pause_time_ratio < 0.0) { |
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1276 _recent_avg_pause_time_ratio = 0.0; |
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1277 } else { |
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1278 assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
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1279 _recent_avg_pause_time_ratio = 1.0; |
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1280 } |
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1281 } |
342 | 1282 } |
1283 | |
1284 if (G1PolicyVerbose > 1) { | |
1285 gclog_or_tty->print_cr(" Recording collection pause(%d)", _n_pauses); | |
1286 } | |
1287 | |
1707 | 1288 PauseSummary* summary = _summary; |
342 | 1289 |
1290 double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); | |
1291 double mark_stack_scan_time = avg_value(_par_last_mark_stack_scan_times_ms); | |
1292 double update_rs_time = avg_value(_par_last_update_rs_times_ms); | |
1293 double update_rs_processed_buffers = | |
1294 sum_of_values(_par_last_update_rs_processed_buffers); | |
1295 double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); | |
1296 double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); | |
1297 double termination_time = avg_value(_par_last_termination_times_ms); | |
1298 | |
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1299 double parallel_other_time = _cur_collection_par_time_ms - |
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1300 (update_rs_time + ext_root_scan_time + mark_stack_scan_time + |
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1301 scan_rs_time + obj_copy_time + termination_time); |
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1302 if (update_stats) { |
342 | 1303 MainBodySummary* body_summary = summary->main_body_summary(); |
1304 guarantee(body_summary != NULL, "should not be null!"); | |
1305 | |
1306 if (_satb_drain_time_set) | |
1307 body_summary->record_satb_drain_time_ms(_cur_satb_drain_time_ms); | |
1308 else | |
1309 body_summary->record_satb_drain_time_ms(0.0); | |
1310 body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); | |
1311 body_summary->record_mark_stack_scan_time_ms(mark_stack_scan_time); | |
1312 body_summary->record_update_rs_time_ms(update_rs_time); | |
1313 body_summary->record_scan_rs_time_ms(scan_rs_time); | |
1314 body_summary->record_obj_copy_time_ms(obj_copy_time); | |
1315 if (parallel) { | |
1316 body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); | |
1317 body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); | |
1318 body_summary->record_termination_time_ms(termination_time); | |
1319 body_summary->record_parallel_other_time_ms(parallel_other_time); | |
1320 } | |
1321 body_summary->record_mark_closure_time_ms(_mark_closure_time_ms); | |
1322 } | |
1323 | |
1324 if (G1PolicyVerbose > 1) { | |
1325 gclog_or_tty->print_cr(" ET: %10.6f ms (avg: %10.6f ms)\n" | |
1326 " CH Strong: %10.6f ms (avg: %10.6f ms)\n" | |
1327 " G1 Strong: %10.6f ms (avg: %10.6f ms)\n" | |
1328 " Evac: %10.6f ms (avg: %10.6f ms)\n" | |
1329 " ET-RS: %10.6f ms (avg: %10.6f ms)\n" | |
1330 " |RS|: " SIZE_FORMAT, | |
1331 elapsed_ms, recent_avg_time_for_pauses_ms(), | |
1332 _cur_CH_strong_roots_dur_ms, recent_avg_time_for_CH_strong_ms(), | |
1333 _cur_G1_strong_roots_dur_ms, recent_avg_time_for_G1_strong_ms(), | |
1334 evac_ms, recent_avg_time_for_evac_ms(), | |
1335 scan_rs_time, | |
1336 recent_avg_time_for_pauses_ms() - | |
1337 recent_avg_time_for_G1_strong_ms(), | |
1338 rs_size); | |
1339 | |
1340 gclog_or_tty->print_cr(" Used at start: " SIZE_FORMAT"K" | |
1341 " At end " SIZE_FORMAT "K\n" | |
1342 " garbage : " SIZE_FORMAT "K" | |
1343 " of " SIZE_FORMAT "K\n" | |
1344 " survival : %6.2f%% (%6.2f%% avg)", | |
1345 _cur_collection_pause_used_at_start_bytes/K, | |
1346 _g1->used()/K, freed_bytes/K, | |
1347 _collection_set_bytes_used_before/K, | |
1348 survival_fraction*100.0, | |
1349 recent_avg_survival_fraction()*100.0); | |
1350 gclog_or_tty->print_cr(" Recent %% gc pause time: %6.2f", | |
1351 recent_avg_pause_time_ratio() * 100.0); | |
1352 } | |
1353 | |
1354 double other_time_ms = elapsed_ms; | |
1355 | |
1707 | 1356 if (_satb_drain_time_set) { |
1357 other_time_ms -= _cur_satb_drain_time_ms; | |
1358 } | |
1359 | |
1360 if (parallel) { | |
1361 other_time_ms -= _cur_collection_par_time_ms + _cur_clear_ct_time_ms; | |
1362 } else { | |
1363 other_time_ms -= | |
1364 update_rs_time + | |
1365 ext_root_scan_time + mark_stack_scan_time + | |
1366 scan_rs_time + obj_copy_time; | |
342 | 1367 } |
1368 | |
1369 if (PrintGCDetails) { | |
1707 | 1370 gclog_or_tty->print_cr("%s, %1.8lf secs]", |
342 | 1371 (last_pause_included_initial_mark) ? " (initial-mark)" : "", |
1372 elapsed_ms / 1000.0); | |
1373 | |
1707 | 1374 if (_satb_drain_time_set) { |
1375 print_stats(1, "SATB Drain Time", _cur_satb_drain_time_ms); | |
1376 } | |
1377 if (_last_satb_drain_processed_buffers >= 0) { | |
1378 print_stats(2, "Processed Buffers", _last_satb_drain_processed_buffers); | |
1379 } | |
1380 if (parallel) { | |
1381 print_stats(1, "Parallel Time", _cur_collection_par_time_ms); | |
1382 print_par_stats(2, "GC Worker Start Time", | |
1383 _par_last_gc_worker_start_times_ms, false); | |
1384 print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); | |
1385 print_par_sizes(3, "Processed Buffers", | |
1386 _par_last_update_rs_processed_buffers, true); | |
1387 print_par_stats(2, "Ext Root Scanning", | |
1388 _par_last_ext_root_scan_times_ms); | |
1389 print_par_stats(2, "Mark Stack Scanning", | |
1390 _par_last_mark_stack_scan_times_ms); | |
1391 print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms); | |
1392 print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms); | |
1393 print_par_stats(2, "Termination", _par_last_termination_times_ms); | |
1394 print_par_sizes(3, "Termination Attempts", | |
1395 _par_last_termination_attempts, true); | |
1396 print_par_stats(2, "GC Worker End Time", | |
1397 _par_last_gc_worker_end_times_ms, false); | |
1398 print_stats(2, "Other", parallel_other_time); | |
1399 print_stats(1, "Clear CT", _cur_clear_ct_time_ms); | |
1400 } else { | |
1401 print_stats(1, "Update RS", update_rs_time); | |
1402 print_stats(2, "Processed Buffers", | |
1403 (int)update_rs_processed_buffers); | |
1404 print_stats(1, "Ext Root Scanning", ext_root_scan_time); | |
1405 print_stats(1, "Mark Stack Scanning", mark_stack_scan_time); | |
1406 print_stats(1, "Scan RS", scan_rs_time); | |
1407 print_stats(1, "Object Copying", obj_copy_time); | |
342 | 1408 } |
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1409 #ifndef PRODUCT |
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1410 print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms); |
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1411 print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms); |
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1412 print_stats(1, "Min Clear CC", _min_clear_cc_time_ms); |
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1413 print_stats(1, "Max Clear CC", _max_clear_cc_time_ms); |
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1414 if (_num_cc_clears > 0) { |
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1415 print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears)); |
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1416 } |
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1417 #endif |
342 | 1418 print_stats(1, "Other", other_time_ms); |
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1419 print_stats(2, "Choose CSet", _recorded_young_cset_choice_time_ms); |
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1420 |
342 | 1421 for (int i = 0; i < _aux_num; ++i) { |
1422 if (_cur_aux_times_set[i]) { | |
1423 char buffer[96]; | |
1424 sprintf(buffer, "Aux%d", i); | |
1425 print_stats(1, buffer, _cur_aux_times_ms[i]); | |
1426 } | |
1427 } | |
1428 } | |
1429 if (PrintGCDetails) | |
1430 gclog_or_tty->print(" ["); | |
1431 if (PrintGC || PrintGCDetails) | |
1432 _g1->print_size_transition(gclog_or_tty, | |
1433 _cur_collection_pause_used_at_start_bytes, | |
1434 _g1->used(), _g1->capacity()); | |
1435 if (PrintGCDetails) | |
1436 gclog_or_tty->print_cr("]"); | |
1437 | |
1438 _all_pause_times_ms->add(elapsed_ms); | |
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1439 if (update_stats) { |
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1440 summary->record_total_time_ms(elapsed_ms); |
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1441 summary->record_other_time_ms(other_time_ms); |
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1442 } |
342 | 1443 for (int i = 0; i < _aux_num; ++i) |
1444 if (_cur_aux_times_set[i]) | |
1445 _all_aux_times_ms[i].add(_cur_aux_times_ms[i]); | |
1446 | |
1447 // Reset marks-between-pauses counter. | |
1448 _n_marks_since_last_pause = 0; | |
1449 | |
1450 // Update the efficiency-since-mark vars. | |
1451 double proc_ms = elapsed_ms * (double) _parallel_gc_threads; | |
1452 if (elapsed_ms < MIN_TIMER_GRANULARITY) { | |
1453 // This usually happens due to the timer not having the required | |
1454 // granularity. Some Linuxes are the usual culprits. | |
1455 // We'll just set it to something (arbitrarily) small. | |
1456 proc_ms = 1.0; | |
1457 } | |
1458 double cur_efficiency = (double) freed_bytes / proc_ms; | |
1459 | |
1460 bool new_in_marking_window = _in_marking_window; | |
1461 bool new_in_marking_window_im = false; | |
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1462 if (during_initial_mark_pause()) { |
342 | 1463 new_in_marking_window = true; |
1464 new_in_marking_window_im = true; | |
1465 } | |
1466 | |
1467 if (in_young_gc_mode()) { | |
1468 if (_last_full_young_gc) { | |
1469 set_full_young_gcs(false); | |
1470 _last_full_young_gc = false; | |
1471 } | |
1472 | |
1473 if ( !_last_young_gc_full ) { | |
1474 if ( _should_revert_to_full_young_gcs || | |
1475 _known_garbage_ratio < 0.05 || | |
1476 (adaptive_young_list_length() && | |
1477 (get_gc_eff_factor() * cur_efficiency < predict_young_gc_eff())) ) { | |
1478 set_full_young_gcs(true); | |
1479 } | |
1480 } | |
1481 _should_revert_to_full_young_gcs = false; | |
1482 | |
1483 if (_last_young_gc_full && !_during_marking) | |
1484 _young_gc_eff_seq->add(cur_efficiency); | |
1485 } | |
1486 | |
1487 _short_lived_surv_rate_group->start_adding_regions(); | |
1488 // do that for any other surv rate groupsx | |
1489 | |
1490 // <NEW PREDICTION> | |
1491 | |
677 | 1492 if (update_stats) { |
342 | 1493 double pause_time_ms = elapsed_ms; |
1494 | |
1495 size_t diff = 0; | |
1496 if (_max_pending_cards >= _pending_cards) | |
1497 diff = _max_pending_cards - _pending_cards; | |
1498 _pending_card_diff_seq->add((double) diff); | |
1499 | |
1500 double cost_per_card_ms = 0.0; | |
1501 if (_pending_cards > 0) { | |
1502 cost_per_card_ms = update_rs_time / (double) _pending_cards; | |
1503 _cost_per_card_ms_seq->add(cost_per_card_ms); | |
1504 } | |
1505 | |
1506 size_t cards_scanned = _g1->cards_scanned(); | |
1507 | |
1508 double cost_per_entry_ms = 0.0; | |
1509 if (cards_scanned > 10) { | |
1510 cost_per_entry_ms = scan_rs_time / (double) cards_scanned; | |
1511 if (_last_young_gc_full) | |
1512 _cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1513 else | |
1514 _partially_young_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1515 } | |
1516 | |
1517 if (_max_rs_lengths > 0) { | |
1518 double cards_per_entry_ratio = | |
1519 (double) cards_scanned / (double) _max_rs_lengths; | |
1520 if (_last_young_gc_full) | |
1521 _fully_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1522 else | |
1523 _partially_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1524 } | |
1525 | |
1526 size_t rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; | |
1527 if (rs_length_diff >= 0) | |
1528 _rs_length_diff_seq->add((double) rs_length_diff); | |
1529 | |
1530 size_t copied_bytes = surviving_bytes; | |
1531 double cost_per_byte_ms = 0.0; | |
1532 if (copied_bytes > 0) { | |
1533 cost_per_byte_ms = obj_copy_time / (double) copied_bytes; | |
1534 if (_in_marking_window) | |
1535 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); | |
1536 else | |
1537 _cost_per_byte_ms_seq->add(cost_per_byte_ms); | |
1538 } | |
1539 | |
1540 double all_other_time_ms = pause_time_ms - | |
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1541 (update_rs_time + scan_rs_time + obj_copy_time + |
342 | 1542 _mark_closure_time_ms + termination_time); |
1543 | |
1544 double young_other_time_ms = 0.0; | |
1545 if (_recorded_young_regions > 0) { | |
1546 young_other_time_ms = | |
1547 _recorded_young_cset_choice_time_ms + | |
1548 _recorded_young_free_cset_time_ms; | |
1549 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / | |
1550 (double) _recorded_young_regions); | |
1551 } | |
1552 double non_young_other_time_ms = 0.0; | |
1553 if (_recorded_non_young_regions > 0) { | |
1554 non_young_other_time_ms = | |
1555 _recorded_non_young_cset_choice_time_ms + | |
1556 _recorded_non_young_free_cset_time_ms; | |
1557 | |
1558 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
1559 (double) _recorded_non_young_regions); | |
1560 } | |
1561 | |
1562 double constant_other_time_ms = all_other_time_ms - | |
1563 (young_other_time_ms + non_young_other_time_ms); | |
1564 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
1565 | |
1566 double survival_ratio = 0.0; | |
1567 if (_bytes_in_collection_set_before_gc > 0) { | |
1568 survival_ratio = (double) bytes_in_to_space_during_gc() / | |
1569 (double) _bytes_in_collection_set_before_gc; | |
1570 } | |
1571 | |
1572 _pending_cards_seq->add((double) _pending_cards); | |
1573 _scanned_cards_seq->add((double) cards_scanned); | |
1574 _rs_lengths_seq->add((double) _max_rs_lengths); | |
1575 | |
1576 double expensive_region_limit_ms = | |
751 | 1577 (double) MaxGCPauseMillis - predict_constant_other_time_ms(); |
342 | 1578 if (expensive_region_limit_ms < 0.0) { |
1579 // this means that the other time was predicted to be longer than | |
1580 // than the max pause time | |
751 | 1581 expensive_region_limit_ms = (double) MaxGCPauseMillis; |
342 | 1582 } |
1583 _expensive_region_limit_ms = expensive_region_limit_ms; | |
1584 | |
1585 if (PREDICTIONS_VERBOSE) { | |
1586 gclog_or_tty->print_cr(""); | |
1587 gclog_or_tty->print_cr("PREDICTIONS %1.4lf %d " | |
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1588 "REGIONS %d %d %d " |
342 | 1589 "PENDING_CARDS %d %d " |
1590 "CARDS_SCANNED %d %d " | |
1591 "RS_LENGTHS %d %d " | |
1592 "RS_UPDATE %1.6lf %1.6lf RS_SCAN %1.6lf %1.6lf " | |
1593 "SURVIVAL_RATIO %1.6lf %1.6lf " | |
1594 "OBJECT_COPY %1.6lf %1.6lf OTHER_CONSTANT %1.6lf %1.6lf " | |
1595 "OTHER_YOUNG %1.6lf %1.6lf " | |
1596 "OTHER_NON_YOUNG %1.6lf %1.6lf " | |
1597 "VTIME_DIFF %1.6lf TERMINATION %1.6lf " | |
1598 "ELAPSED %1.6lf %1.6lf ", | |
1599 _cur_collection_start_sec, | |
1600 (!_last_young_gc_full) ? 2 : | |
1601 (last_pause_included_initial_mark) ? 1 : 0, | |
1602 _recorded_region_num, | |
1603 _recorded_young_regions, | |
1604 _recorded_non_young_regions, | |
1605 _predicted_pending_cards, _pending_cards, | |
1606 _predicted_cards_scanned, cards_scanned, | |
1607 _predicted_rs_lengths, _max_rs_lengths, | |
1608 _predicted_rs_update_time_ms, update_rs_time, | |
1609 _predicted_rs_scan_time_ms, scan_rs_time, | |
1610 _predicted_survival_ratio, survival_ratio, | |
1611 _predicted_object_copy_time_ms, obj_copy_time, | |
1612 _predicted_constant_other_time_ms, constant_other_time_ms, | |
1613 _predicted_young_other_time_ms, young_other_time_ms, | |
1614 _predicted_non_young_other_time_ms, | |
1615 non_young_other_time_ms, | |
1616 _vtime_diff_ms, termination_time, | |
1617 _predicted_pause_time_ms, elapsed_ms); | |
1618 } | |
1619 | |
1620 if (G1PolicyVerbose > 0) { | |
1621 gclog_or_tty->print_cr("Pause Time, predicted: %1.4lfms (predicted %s), actual: %1.4lfms", | |
1622 _predicted_pause_time_ms, | |
1623 (_within_target) ? "within" : "outside", | |
1624 elapsed_ms); | |
1625 } | |
1626 | |
1627 } | |
1628 | |
1629 _in_marking_window = new_in_marking_window; | |
1630 _in_marking_window_im = new_in_marking_window_im; | |
1631 _free_regions_at_end_of_collection = _g1->free_regions(); | |
1632 calculate_young_list_min_length(); | |
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1633 calculate_young_list_target_length(); |
342 | 1634 |
1111 | 1635 // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
1282 | 1636 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
1111 | 1637 adjust_concurrent_refinement(update_rs_time, update_rs_processed_buffers, update_rs_time_goal_ms); |
342 | 1638 // </NEW PREDICTION> |
1639 } | |
1640 | |
1641 // <NEW PREDICTION> | |
1642 | |
1111 | 1643 void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
1644 double update_rs_processed_buffers, | |
1645 double goal_ms) { | |
1646 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
1647 ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); | |
1648 | |
1282 | 1649 if (G1UseAdaptiveConcRefinement) { |
1111 | 1650 const int k_gy = 3, k_gr = 6; |
1651 const double inc_k = 1.1, dec_k = 0.9; | |
1652 | |
1653 int g = cg1r->green_zone(); | |
1654 if (update_rs_time > goal_ms) { | |
1655 g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. | |
1656 } else { | |
1657 if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { | |
1658 g = (int)MAX2(g * inc_k, g + 1.0); | |
1659 } | |
1660 } | |
1661 // Change the refinement threads params | |
1662 cg1r->set_green_zone(g); | |
1663 cg1r->set_yellow_zone(g * k_gy); | |
1664 cg1r->set_red_zone(g * k_gr); | |
1665 cg1r->reinitialize_threads(); | |
1666 | |
1667 int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); | |
1668 int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, | |
1669 cg1r->yellow_zone()); | |
1670 // Change the barrier params | |
1671 dcqs.set_process_completed_threshold(processing_threshold); | |
1672 dcqs.set_max_completed_queue(cg1r->red_zone()); | |
1673 } | |
1674 | |
1675 int curr_queue_size = dcqs.completed_buffers_num(); | |
1676 if (curr_queue_size >= cg1r->yellow_zone()) { | |
1677 dcqs.set_completed_queue_padding(curr_queue_size); | |
1678 } else { | |
1679 dcqs.set_completed_queue_padding(0); | |
1680 } | |
1681 dcqs.notify_if_necessary(); | |
1682 } | |
1683 | |
342 | 1684 double |
1685 G1CollectorPolicy:: | |
1686 predict_young_collection_elapsed_time_ms(size_t adjustment) { | |
1687 guarantee( adjustment == 0 || adjustment == 1, "invariant" ); | |
1688 | |
1689 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
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1690 size_t young_num = g1h->young_list()->length(); |
342 | 1691 if (young_num == 0) |
1692 return 0.0; | |
1693 | |
1694 young_num += adjustment; | |
1695 size_t pending_cards = predict_pending_cards(); | |
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1696 size_t rs_lengths = g1h->young_list()->sampled_rs_lengths() + |
342 | 1697 predict_rs_length_diff(); |
1698 size_t card_num; | |
1699 if (full_young_gcs()) | |
1700 card_num = predict_young_card_num(rs_lengths); | |
1701 else | |
1702 card_num = predict_non_young_card_num(rs_lengths); | |
1703 size_t young_byte_size = young_num * HeapRegion::GrainBytes; | |
1704 double accum_yg_surv_rate = | |
1705 _short_lived_surv_rate_group->accum_surv_rate(adjustment); | |
1706 | |
1707 size_t bytes_to_copy = | |
1708 (size_t) (accum_yg_surv_rate * (double) HeapRegion::GrainBytes); | |
1709 | |
1710 return | |
1711 predict_rs_update_time_ms(pending_cards) + | |
1712 predict_rs_scan_time_ms(card_num) + | |
1713 predict_object_copy_time_ms(bytes_to_copy) + | |
1714 predict_young_other_time_ms(young_num) + | |
1715 predict_constant_other_time_ms(); | |
1716 } | |
1717 | |
1718 double | |
1719 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { | |
1720 size_t rs_length = predict_rs_length_diff(); | |
1721 size_t card_num; | |
1722 if (full_young_gcs()) | |
1723 card_num = predict_young_card_num(rs_length); | |
1724 else | |
1725 card_num = predict_non_young_card_num(rs_length); | |
1726 return predict_base_elapsed_time_ms(pending_cards, card_num); | |
1727 } | |
1728 | |
1729 double | |
1730 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
1731 size_t scanned_cards) { | |
1732 return | |
1733 predict_rs_update_time_ms(pending_cards) + | |
1734 predict_rs_scan_time_ms(scanned_cards) + | |
1735 predict_constant_other_time_ms(); | |
1736 } | |
1737 | |
1738 double | |
1739 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
1740 bool young) { | |
1741 size_t rs_length = hr->rem_set()->occupied(); | |
1742 size_t card_num; | |
1743 if (full_young_gcs()) | |
1744 card_num = predict_young_card_num(rs_length); | |
1745 else | |
1746 card_num = predict_non_young_card_num(rs_length); | |
1747 size_t bytes_to_copy = predict_bytes_to_copy(hr); | |
1748 | |
1749 double region_elapsed_time_ms = | |
1750 predict_rs_scan_time_ms(card_num) + | |
1751 predict_object_copy_time_ms(bytes_to_copy); | |
1752 | |
1753 if (young) | |
1754 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
1755 else | |
1756 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
1757 | |
1758 return region_elapsed_time_ms; | |
1759 } | |
1760 | |
1761 size_t | |
1762 G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { | |
1763 size_t bytes_to_copy; | |
1764 if (hr->is_marked()) | |
1765 bytes_to_copy = hr->max_live_bytes(); | |
1766 else { | |
1767 guarantee( hr->is_young() && hr->age_in_surv_rate_group() != -1, | |
1768 "invariant" ); | |
1769 int age = hr->age_in_surv_rate_group(); | |
545 | 1770 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
342 | 1771 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
1772 } | |
1773 | |
1774 return bytes_to_copy; | |
1775 } | |
1776 | |
1777 void | |
1778 G1CollectorPolicy::start_recording_regions() { | |
1779 _recorded_rs_lengths = 0; | |
1780 _recorded_young_regions = 0; | |
1781 _recorded_non_young_regions = 0; | |
1782 | |
1783 #if PREDICTIONS_VERBOSE | |
1784 _recorded_marked_bytes = 0; | |
1785 _recorded_young_bytes = 0; | |
1786 _predicted_bytes_to_copy = 0; | |
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1787 _predicted_rs_lengths = 0; |
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1788 _predicted_cards_scanned = 0; |
342 | 1789 #endif // PREDICTIONS_VERBOSE |
1790 } | |
1791 | |
1792 void | |
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1793 G1CollectorPolicy::record_cset_region_info(HeapRegion* hr, bool young) { |
342 | 1794 #if PREDICTIONS_VERBOSE |
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1795 if (!young) { |
342 | 1796 _recorded_marked_bytes += hr->max_live_bytes(); |
1797 } | |
1798 _predicted_bytes_to_copy += predict_bytes_to_copy(hr); | |
1799 #endif // PREDICTIONS_VERBOSE | |
1800 | |
1801 size_t rs_length = hr->rem_set()->occupied(); | |
1802 _recorded_rs_lengths += rs_length; | |
1803 } | |
1804 | |
1805 void | |
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1806 G1CollectorPolicy::record_non_young_cset_region(HeapRegion* hr) { |
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1807 assert(!hr->is_young(), "should not call this"); |
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1808 ++_recorded_non_young_regions; |
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1809 record_cset_region_info(hr, false); |
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1810 } |
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1811 |
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1812 void |
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1813 G1CollectorPolicy::set_recorded_young_regions(size_t n_regions) { |
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1814 _recorded_young_regions = n_regions; |
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1815 } |
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1816 |
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1817 void G1CollectorPolicy::set_recorded_young_bytes(size_t bytes) { |
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1818 #if PREDICTIONS_VERBOSE |
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1819 _recorded_young_bytes = bytes; |
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1820 #endif // PREDICTIONS_VERBOSE |
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1821 } |
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1822 |
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1823 void G1CollectorPolicy::set_recorded_rs_lengths(size_t rs_lengths) { |
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1824 _recorded_rs_lengths = rs_lengths; |
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1825 } |
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1826 |
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1827 void G1CollectorPolicy::set_predicted_bytes_to_copy(size_t bytes) { |
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1828 _predicted_bytes_to_copy = bytes; |
342 | 1829 } |
1830 | |
1831 void | |
1832 G1CollectorPolicy::end_recording_regions() { | |
1394
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1833 // The _predicted_pause_time_ms field is referenced in code |
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1834 // not under PREDICTIONS_VERBOSE. Let's initialize it. |
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1835 _predicted_pause_time_ms = -1.0; |
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1836 |
342 | 1837 #if PREDICTIONS_VERBOSE |
1838 _predicted_pending_cards = predict_pending_cards(); | |
1839 _predicted_rs_lengths = _recorded_rs_lengths + predict_rs_length_diff(); | |
1840 if (full_young_gcs()) | |
1841 _predicted_cards_scanned += predict_young_card_num(_predicted_rs_lengths); | |
1842 else | |
1843 _predicted_cards_scanned += | |
1844 predict_non_young_card_num(_predicted_rs_lengths); | |
1845 _recorded_region_num = _recorded_young_regions + _recorded_non_young_regions; | |
1846 | |
1847 _predicted_rs_update_time_ms = | |
1848 predict_rs_update_time_ms(_g1->pending_card_num()); | |
1849 _predicted_rs_scan_time_ms = | |
1850 predict_rs_scan_time_ms(_predicted_cards_scanned); | |
1851 _predicted_object_copy_time_ms = | |
1852 predict_object_copy_time_ms(_predicted_bytes_to_copy); | |
1853 _predicted_constant_other_time_ms = | |
1854 predict_constant_other_time_ms(); | |
1855 _predicted_young_other_time_ms = | |
1856 predict_young_other_time_ms(_recorded_young_regions); | |
1857 _predicted_non_young_other_time_ms = | |
1858 predict_non_young_other_time_ms(_recorded_non_young_regions); | |
1859 | |
1860 _predicted_pause_time_ms = | |
1861 _predicted_rs_update_time_ms + | |
1862 _predicted_rs_scan_time_ms + | |
1863 _predicted_object_copy_time_ms + | |
1864 _predicted_constant_other_time_ms + | |
1865 _predicted_young_other_time_ms + | |
1866 _predicted_non_young_other_time_ms; | |
1867 #endif // PREDICTIONS_VERBOSE | |
1868 } | |
1869 | |
1870 void G1CollectorPolicy::check_if_region_is_too_expensive(double | |
1871 predicted_time_ms) { | |
1872 // I don't think we need to do this when in young GC mode since | |
1873 // marking will be initiated next time we hit the soft limit anyway... | |
1874 if (predicted_time_ms > _expensive_region_limit_ms) { | |
1875 if (!in_young_gc_mode()) { | |
1876 set_full_young_gcs(true); | |
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1877 // We might want to do something different here. However, |
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1878 // right now we don't support the non-generational G1 mode |
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1879 // (and in fact we are planning to remove the associated code, |
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1880 // see CR 6814390). So, let's leave it as is and this will be |
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1881 // removed some time in the future |
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1882 ShouldNotReachHere(); |
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1883 set_during_initial_mark_pause(); |
342 | 1884 } else |
1885 // no point in doing another partial one | |
1886 _should_revert_to_full_young_gcs = true; | |
1887 } | |
1888 } | |
1889 | |
1890 // </NEW PREDICTION> | |
1891 | |
1892 | |
1893 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, | |
1894 double elapsed_ms) { | |
1895 _recent_gc_times_ms->add(elapsed_ms); | |
1896 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
1897 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
1898 } | |
1899 | |
1900 double G1CollectorPolicy::recent_avg_time_for_pauses_ms() { | |
751 | 1901 if (_recent_pause_times_ms->num() == 0) return (double) MaxGCPauseMillis; |
342 | 1902 else return _recent_pause_times_ms->avg(); |
1903 } | |
1904 | |
1905 double G1CollectorPolicy::recent_avg_time_for_CH_strong_ms() { | |
1906 if (_recent_CH_strong_roots_times_ms->num() == 0) | |
751 | 1907 return (double)MaxGCPauseMillis/3.0; |
342 | 1908 else return _recent_CH_strong_roots_times_ms->avg(); |
1909 } | |
1910 | |
1911 double G1CollectorPolicy::recent_avg_time_for_G1_strong_ms() { | |
1912 if (_recent_G1_strong_roots_times_ms->num() == 0) | |
751 | 1913 return (double)MaxGCPauseMillis/3.0; |
342 | 1914 else return _recent_G1_strong_roots_times_ms->avg(); |
1915 } | |
1916 | |
1917 double G1CollectorPolicy::recent_avg_time_for_evac_ms() { | |
751 | 1918 if (_recent_evac_times_ms->num() == 0) return (double)MaxGCPauseMillis/3.0; |
342 | 1919 else return _recent_evac_times_ms->avg(); |
1920 } | |
1921 | |
1922 int G1CollectorPolicy::number_of_recent_gcs() { | |
1923 assert(_recent_CH_strong_roots_times_ms->num() == | |
1924 _recent_G1_strong_roots_times_ms->num(), "Sequence out of sync"); | |
1925 assert(_recent_G1_strong_roots_times_ms->num() == | |
1926 _recent_evac_times_ms->num(), "Sequence out of sync"); | |
1927 assert(_recent_evac_times_ms->num() == | |
1928 _recent_pause_times_ms->num(), "Sequence out of sync"); | |
1929 assert(_recent_pause_times_ms->num() == | |
1930 _recent_CS_bytes_used_before->num(), "Sequence out of sync"); | |
1931 assert(_recent_CS_bytes_used_before->num() == | |
1932 _recent_CS_bytes_surviving->num(), "Sequence out of sync"); | |
1933 return _recent_pause_times_ms->num(); | |
1934 } | |
1935 | |
1936 double G1CollectorPolicy::recent_avg_survival_fraction() { | |
1937 return recent_avg_survival_fraction_work(_recent_CS_bytes_surviving, | |
1938 _recent_CS_bytes_used_before); | |
1939 } | |
1940 | |
1941 double G1CollectorPolicy::last_survival_fraction() { | |
1942 return last_survival_fraction_work(_recent_CS_bytes_surviving, | |
1943 _recent_CS_bytes_used_before); | |
1944 } | |
1945 | |
1946 double | |
1947 G1CollectorPolicy::recent_avg_survival_fraction_work(TruncatedSeq* surviving, | |
1948 TruncatedSeq* before) { | |
1949 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
1950 if (before->sum() > 0.0) { | |
1951 double recent_survival_rate = surviving->sum() / before->sum(); | |
1952 // We exempt parallel collection from this check because Alloc Buffer | |
1953 // fragmentation can produce negative collections. | |
1954 // Further, we're now always doing parallel collection. But I'm still | |
1955 // leaving this here as a placeholder for a more precise assertion later. | |
1956 // (DLD, 10/05.) | |
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1957 assert((true || G1CollectedHeap::use_parallel_gc_threads()) || |
342 | 1958 _g1->evacuation_failed() || |
1959 recent_survival_rate <= 1.0, "Or bad frac"); | |
1960 return recent_survival_rate; | |
1961 } else { | |
1962 return 1.0; // Be conservative. | |
1963 } | |
1964 } | |
1965 | |
1966 double | |
1967 G1CollectorPolicy::last_survival_fraction_work(TruncatedSeq* surviving, | |
1968 TruncatedSeq* before) { | |
1969 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
1970 if (surviving->num() > 0 && before->last() > 0.0) { | |
1971 double last_survival_rate = surviving->last() / before->last(); | |
1972 // We exempt parallel collection from this check because Alloc Buffer | |
1973 // fragmentation can produce negative collections. | |
1974 // Further, we're now always doing parallel collection. But I'm still | |
1975 // leaving this here as a placeholder for a more precise assertion later. | |
1976 // (DLD, 10/05.) | |
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1977 assert((true || G1CollectedHeap::use_parallel_gc_threads()) || |
342 | 1978 last_survival_rate <= 1.0, "Or bad frac"); |
1979 return last_survival_rate; | |
1980 } else { | |
1981 return 1.0; | |
1982 } | |
1983 } | |
1984 | |
1985 static const int survival_min_obs = 5; | |
1986 static double survival_min_obs_limits[] = { 0.9, 0.7, 0.5, 0.3, 0.1 }; | |
1987 static const double min_survival_rate = 0.1; | |
1988 | |
1989 double | |
1990 G1CollectorPolicy::conservative_avg_survival_fraction_work(double avg, | |
1991 double latest) { | |
1992 double res = avg; | |
1993 if (number_of_recent_gcs() < survival_min_obs) { | |
1994 res = MAX2(res, survival_min_obs_limits[number_of_recent_gcs()]); | |
1995 } | |
1996 res = MAX2(res, latest); | |
1997 res = MAX2(res, min_survival_rate); | |
1998 // In the parallel case, LAB fragmentation can produce "negative | |
1999 // collections"; so can evac failure. Cap at 1.0 | |
2000 res = MIN2(res, 1.0); | |
2001 return res; | |
2002 } | |
2003 | |
2004 size_t G1CollectorPolicy::expansion_amount() { | |
1356 | 2005 if ((recent_avg_pause_time_ratio() * 100.0) > _gc_overhead_perc) { |
751 | 2006 // We will double the existing space, or take |
2007 // G1ExpandByPercentOfAvailable % of the available expansion | |
2008 // space, whichever is smaller, bounded below by a minimum | |
2009 // expansion (unless that's all that's left.) | |
342 | 2010 const size_t min_expand_bytes = 1*M; |
2011 size_t reserved_bytes = _g1->g1_reserved_obj_bytes(); | |
2012 size_t committed_bytes = _g1->capacity(); | |
2013 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
2014 size_t expand_bytes; | |
2015 size_t expand_bytes_via_pct = | |
751 | 2016 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
342 | 2017 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
2018 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
2019 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
2020 if (G1PolicyVerbose > 1) { | |
2021 gclog_or_tty->print("Decided to expand: ratio = %5.2f, " | |
2022 "committed = %d%s, uncommited = %d%s, via pct = %d%s.\n" | |
2023 " Answer = %d.\n", | |
2024 recent_avg_pause_time_ratio(), | |
2025 byte_size_in_proper_unit(committed_bytes), | |
2026 proper_unit_for_byte_size(committed_bytes), | |
2027 byte_size_in_proper_unit(uncommitted_bytes), | |
2028 proper_unit_for_byte_size(uncommitted_bytes), | |
2029 byte_size_in_proper_unit(expand_bytes_via_pct), | |
2030 proper_unit_for_byte_size(expand_bytes_via_pct), | |
2031 byte_size_in_proper_unit(expand_bytes), | |
2032 proper_unit_for_byte_size(expand_bytes)); | |
2033 } | |
2034 return expand_bytes; | |
2035 } else { | |
2036 return 0; | |
2037 } | |
2038 } | |
2039 | |
2040 void G1CollectorPolicy::note_start_of_mark_thread() { | |
2041 _mark_thread_startup_sec = os::elapsedTime(); | |
2042 } | |
2043 | |
2044 class CountCSClosure: public HeapRegionClosure { | |
2045 G1CollectorPolicy* _g1_policy; | |
2046 public: | |
2047 CountCSClosure(G1CollectorPolicy* g1_policy) : | |
2048 _g1_policy(g1_policy) {} | |
2049 bool doHeapRegion(HeapRegion* r) { | |
2050 _g1_policy->_bytes_in_collection_set_before_gc += r->used(); | |
2051 return false; | |
2052 } | |
2053 }; | |
2054 | |
2055 void G1CollectorPolicy::count_CS_bytes_used() { | |
2056 CountCSClosure cs_closure(this); | |
2057 _g1->collection_set_iterate(&cs_closure); | |
2058 } | |
2059 | |
2060 static void print_indent(int level) { | |
2061 for (int j = 0; j < level+1; ++j) | |
2062 gclog_or_tty->print(" "); | |
2063 } | |
2064 | |
2065 void G1CollectorPolicy::print_summary (int level, | |
2066 const char* str, | |
2067 NumberSeq* seq) const { | |
2068 double sum = seq->sum(); | |
2069 print_indent(level); | |
2070 gclog_or_tty->print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", | |
2071 str, sum / 1000.0, seq->avg()); | |
2072 } | |
2073 | |
2074 void G1CollectorPolicy::print_summary_sd (int level, | |
2075 const char* str, | |
2076 NumberSeq* seq) const { | |
2077 print_summary(level, str, seq); | |
2078 print_indent(level + 5); | |
2079 gclog_or_tty->print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", | |
2080 seq->num(), seq->sd(), seq->maximum()); | |
2081 } | |
2082 | |
2083 void G1CollectorPolicy::check_other_times(int level, | |
2084 NumberSeq* other_times_ms, | |
2085 NumberSeq* calc_other_times_ms) const { | |
2086 bool should_print = false; | |
2087 | |
2088 double max_sum = MAX2(fabs(other_times_ms->sum()), | |
2089 fabs(calc_other_times_ms->sum())); | |
2090 double min_sum = MIN2(fabs(other_times_ms->sum()), | |
2091 fabs(calc_other_times_ms->sum())); | |
2092 double sum_ratio = max_sum / min_sum; | |
2093 if (sum_ratio > 1.1) { | |
2094 should_print = true; | |
2095 print_indent(level + 1); | |
2096 gclog_or_tty->print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); | |
2097 } | |
2098 | |
2099 double max_avg = MAX2(fabs(other_times_ms->avg()), | |
2100 fabs(calc_other_times_ms->avg())); | |
2101 double min_avg = MIN2(fabs(other_times_ms->avg()), | |
2102 fabs(calc_other_times_ms->avg())); | |
2103 double avg_ratio = max_avg / min_avg; | |
2104 if (avg_ratio > 1.1) { | |
2105 should_print = true; | |
2106 print_indent(level + 1); | |
2107 gclog_or_tty->print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); | |
2108 } | |
2109 | |
2110 if (other_times_ms->sum() < -0.01) { | |
2111 print_indent(level + 1); | |
2112 gclog_or_tty->print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); | |
2113 } | |
2114 | |
2115 if (other_times_ms->avg() < -0.01) { | |
2116 print_indent(level + 1); | |
2117 gclog_or_tty->print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); | |
2118 } | |
2119 | |
2120 if (calc_other_times_ms->sum() < -0.01) { | |
2121 should_print = true; | |
2122 print_indent(level + 1); | |
2123 gclog_or_tty->print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); | |
2124 } | |
2125 | |
2126 if (calc_other_times_ms->avg() < -0.01) { | |
2127 should_print = true; | |
2128 print_indent(level + 1); | |
2129 gclog_or_tty->print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); | |
2130 } | |
2131 | |
2132 if (should_print) | |
2133 print_summary(level, "Other(Calc)", calc_other_times_ms); | |
2134 } | |
2135 | |
2136 void G1CollectorPolicy::print_summary(PauseSummary* summary) const { | |
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2137 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
342 | 2138 MainBodySummary* body_summary = summary->main_body_summary(); |
2139 if (summary->get_total_seq()->num() > 0) { | |
677 | 2140 print_summary_sd(0, "Evacuation Pauses", summary->get_total_seq()); |
342 | 2141 if (body_summary != NULL) { |
2142 print_summary(1, "SATB Drain", body_summary->get_satb_drain_seq()); | |
2143 if (parallel) { | |
2144 print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); | |
2145 print_summary(2, "Update RS", body_summary->get_update_rs_seq()); | |
2146 print_summary(2, "Ext Root Scanning", | |
2147 body_summary->get_ext_root_scan_seq()); | |
2148 print_summary(2, "Mark Stack Scanning", | |
2149 body_summary->get_mark_stack_scan_seq()); | |
2150 print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); | |
2151 print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); | |
2152 print_summary(2, "Termination", body_summary->get_termination_seq()); | |
2153 print_summary(2, "Other", body_summary->get_parallel_other_seq()); | |
2154 { | |
2155 NumberSeq* other_parts[] = { | |
2156 body_summary->get_update_rs_seq(), | |
2157 body_summary->get_ext_root_scan_seq(), | |
2158 body_summary->get_mark_stack_scan_seq(), | |
2159 body_summary->get_scan_rs_seq(), | |
2160 body_summary->get_obj_copy_seq(), | |
2161 body_summary->get_termination_seq() | |
2162 }; | |
2163 NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), | |
1779 | 2164 6, other_parts); |
342 | 2165 check_other_times(2, body_summary->get_parallel_other_seq(), |
2166 &calc_other_times_ms); | |
2167 } | |
2168 print_summary(1, "Mark Closure", body_summary->get_mark_closure_seq()); | |
2169 print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); | |
2170 } else { | |
2171 print_summary(1, "Update RS", body_summary->get_update_rs_seq()); | |
2172 print_summary(1, "Ext Root Scanning", | |
2173 body_summary->get_ext_root_scan_seq()); | |
2174 print_summary(1, "Mark Stack Scanning", | |
2175 body_summary->get_mark_stack_scan_seq()); | |
2176 print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); | |
2177 print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); | |
2178 } | |
2179 } | |
2180 print_summary(1, "Other", summary->get_other_seq()); | |
2181 { | |
1779 | 2182 if (body_summary != NULL) { |
2183 NumberSeq calc_other_times_ms; | |
2184 if (parallel) { | |
2185 // parallel | |
2186 NumberSeq* other_parts[] = { | |
2187 body_summary->get_satb_drain_seq(), | |
2188 body_summary->get_parallel_seq(), | |
2189 body_summary->get_clear_ct_seq() | |
2190 }; | |
2191 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
2192 3, other_parts); | |
2193 } else { | |
2194 // serial | |
2195 NumberSeq* other_parts[] = { | |
2196 body_summary->get_satb_drain_seq(), | |
2197 body_summary->get_update_rs_seq(), | |
2198 body_summary->get_ext_root_scan_seq(), | |
2199 body_summary->get_mark_stack_scan_seq(), | |
2200 body_summary->get_scan_rs_seq(), | |
2201 body_summary->get_obj_copy_seq() | |
2202 }; | |
2203 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
2204 6, other_parts); | |
2205 } | |
2206 check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); | |
342 | 2207 } |
2208 } | |
2209 } else { | |
2210 print_indent(0); | |
2211 gclog_or_tty->print_cr("none"); | |
2212 } | |
2213 gclog_or_tty->print_cr(""); | |
2214 } | |
2215 | |
2216 void G1CollectorPolicy::print_tracing_info() const { | |
2217 if (TraceGen0Time) { | |
2218 gclog_or_tty->print_cr("ALL PAUSES"); | |
2219 print_summary_sd(0, "Total", _all_pause_times_ms); | |
2220 gclog_or_tty->print_cr(""); | |
2221 gclog_or_tty->print_cr(""); | |
2222 gclog_or_tty->print_cr(" Full Young GC Pauses: %8d", _full_young_pause_num); | |
2223 gclog_or_tty->print_cr(" Partial Young GC Pauses: %8d", _partial_young_pause_num); | |
2224 gclog_or_tty->print_cr(""); | |
2225 | |
677 | 2226 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
2227 print_summary(_summary); | |
342 | 2228 |
2229 gclog_or_tty->print_cr("MISC"); | |
2230 print_summary_sd(0, "Stop World", _all_stop_world_times_ms); | |
2231 print_summary_sd(0, "Yields", _all_yield_times_ms); | |
2232 for (int i = 0; i < _aux_num; ++i) { | |
2233 if (_all_aux_times_ms[i].num() > 0) { | |
2234 char buffer[96]; | |
2235 sprintf(buffer, "Aux%d", i); | |
2236 print_summary_sd(0, buffer, &_all_aux_times_ms[i]); | |
2237 } | |
2238 } | |
2239 | |
2240 size_t all_region_num = _region_num_young + _region_num_tenured; | |
2241 gclog_or_tty->print_cr(" New Regions %8d, Young %8d (%6.2lf%%), " | |
2242 "Tenured %8d (%6.2lf%%)", | |
2243 all_region_num, | |
2244 _region_num_young, | |
2245 (double) _region_num_young / (double) all_region_num * 100.0, | |
2246 _region_num_tenured, | |
2247 (double) _region_num_tenured / (double) all_region_num * 100.0); | |
2248 } | |
2249 if (TraceGen1Time) { | |
2250 if (_all_full_gc_times_ms->num() > 0) { | |
2251 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", | |
2252 _all_full_gc_times_ms->num(), | |
2253 _all_full_gc_times_ms->sum() / 1000.0); | |
2254 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); | |
2255 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", | |
2256 _all_full_gc_times_ms->sd(), | |
2257 _all_full_gc_times_ms->maximum()); | |
2258 } | |
2259 } | |
2260 } | |
2261 | |
2262 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
2263 #ifndef PRODUCT | |
2264 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
2265 // add this call for any other surv rate groups | |
2266 #endif // PRODUCT | |
2267 } | |
2268 | |
2269 bool | |
2270 G1CollectorPolicy::should_add_next_region_to_young_list() { | |
2271 assert(in_young_gc_mode(), "should be in young GC mode"); | |
2272 bool ret; | |
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2273 size_t young_list_length = _g1->young_list()->length(); |
545 | 2274 size_t young_list_max_length = _young_list_target_length; |
2275 if (G1FixedEdenSize) { | |
2276 young_list_max_length -= _max_survivor_regions; | |
2277 } | |
2278 if (young_list_length < young_list_max_length) { | |
342 | 2279 ret = true; |
2280 ++_region_num_young; | |
2281 } else { | |
2282 ret = false; | |
2283 ++_region_num_tenured; | |
2284 } | |
2285 | |
2286 return ret; | |
2287 } | |
2288 | |
2289 #ifndef PRODUCT | |
2290 // for debugging, bit of a hack... | |
2291 static char* | |
2292 region_num_to_mbs(int length) { | |
2293 static char buffer[64]; | |
2294 double bytes = (double) (length * HeapRegion::GrainBytes); | |
2295 double mbs = bytes / (double) (1024 * 1024); | |
2296 sprintf(buffer, "%7.2lfMB", mbs); | |
2297 return buffer; | |
2298 } | |
2299 #endif // PRODUCT | |
2300 | |
545 | 2301 size_t G1CollectorPolicy::max_regions(int purpose) { |
342 | 2302 switch (purpose) { |
2303 case GCAllocForSurvived: | |
545 | 2304 return _max_survivor_regions; |
342 | 2305 case GCAllocForTenured: |
545 | 2306 return REGIONS_UNLIMITED; |
342 | 2307 default: |
545 | 2308 ShouldNotReachHere(); |
2309 return REGIONS_UNLIMITED; | |
342 | 2310 }; |
2311 } | |
2312 | |
545 | 2313 // Calculates survivor space parameters. |
2314 void G1CollectorPolicy::calculate_survivors_policy() | |
2315 { | |
2316 if (G1FixedSurvivorSpaceSize == 0) { | |
2317 _max_survivor_regions = _young_list_target_length / SurvivorRatio; | |
2318 } else { | |
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2319 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
545 | 2320 } |
2321 | |
2322 if (G1FixedTenuringThreshold) { | |
2323 _tenuring_threshold = MaxTenuringThreshold; | |
2324 } else { | |
2325 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( | |
2326 HeapRegion::GrainWords * _max_survivor_regions); | |
2327 } | |
2328 } | |
2329 | |
342 | 2330 bool |
2331 G1CollectorPolicy_BestRegionsFirst::should_do_collection_pause(size_t | |
2332 word_size) { | |
2333 assert(_g1->regions_accounted_for(), "Region leakage!"); | |
2334 double max_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; | |
2335 | |
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2336 size_t young_list_length = _g1->young_list()->length(); |
545 | 2337 size_t young_list_max_length = _young_list_target_length; |
2338 if (G1FixedEdenSize) { | |
2339 young_list_max_length -= _max_survivor_regions; | |
2340 } | |
2341 bool reached_target_length = young_list_length >= young_list_max_length; | |
342 | 2342 |
2343 if (in_young_gc_mode()) { | |
2344 if (reached_target_length) { | |
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2345 assert( young_list_length > 0 && _g1->young_list()->length() > 0, |
342 | 2346 "invariant" ); |
2347 return true; | |
2348 } | |
2349 } else { | |
2350 guarantee( false, "should not reach here" ); | |
2351 } | |
2352 | |
2353 return false; | |
2354 } | |
2355 | |
2356 #ifndef PRODUCT | |
2357 class HRSortIndexIsOKClosure: public HeapRegionClosure { | |
2358 CollectionSetChooser* _chooser; | |
2359 public: | |
2360 HRSortIndexIsOKClosure(CollectionSetChooser* chooser) : | |
2361 _chooser(chooser) {} | |
2362 | |
2363 bool doHeapRegion(HeapRegion* r) { | |
2364 if (!r->continuesHumongous()) { | |
2365 assert(_chooser->regionProperlyOrdered(r), "Ought to be."); | |
2366 } | |
2367 return false; | |
2368 } | |
2369 }; | |
2370 | |
2371 bool G1CollectorPolicy_BestRegionsFirst::assertMarkedBytesDataOK() { | |
2372 HRSortIndexIsOKClosure cl(_collectionSetChooser); | |
2373 _g1->heap_region_iterate(&cl); | |
2374 return true; | |
2375 } | |
2376 #endif | |
2377 | |
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2378 bool |
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2379 G1CollectorPolicy::force_initial_mark_if_outside_cycle() { |
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2380 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2381 if (!during_cycle) { |
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2382 set_initiate_conc_mark_if_possible(); |
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2383 return true; |
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2384 } else { |
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2385 return false; |
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2386 } |
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2387 } |
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2388 |
342 | 2389 void |
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2390 G1CollectorPolicy::decide_on_conc_mark_initiation() { |
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2391 // We are about to decide on whether this pause will be an |
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2392 // initial-mark pause. |
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2393 |
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2394 // First, during_initial_mark_pause() should not be already set. We |
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2395 // will set it here if we have to. However, it should be cleared by |
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2396 // the end of the pause (it's only set for the duration of an |
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2397 // initial-mark pause). |
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2398 assert(!during_initial_mark_pause(), "pre-condition"); |
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2399 |
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2400 if (initiate_conc_mark_if_possible()) { |
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2401 // We had noticed on a previous pause that the heap occupancy has |
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2402 // gone over the initiating threshold and we should start a |
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2403 // concurrent marking cycle. So we might initiate one. |
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2404 |
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2405 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2406 if (!during_cycle) { |
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2407 // The concurrent marking thread is not "during a cycle", i.e., |
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2408 // it has completed the last one. So we can go ahead and |
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2409 // initiate a new cycle. |
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2410 |
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2411 set_during_initial_mark_pause(); |
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2412 |
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2413 // And we can now clear initiate_conc_mark_if_possible() as |
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2414 // we've already acted on it. |
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2415 clear_initiate_conc_mark_if_possible(); |
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2416 } else { |
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2417 // The concurrent marking thread is still finishing up the |
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2418 // previous cycle. If we start one right now the two cycles |
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2419 // overlap. In particular, the concurrent marking thread might |
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2420 // be in the process of clearing the next marking bitmap (which |
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2421 // we will use for the next cycle if we start one). Starting a |
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2422 // cycle now will be bad given that parts of the marking |
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2423 // information might get cleared by the marking thread. And we |
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2424 // cannot wait for the marking thread to finish the cycle as it |
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2425 // periodically yields while clearing the next marking bitmap |
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2426 // and, if it's in a yield point, it's waiting for us to |
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2427 // finish. So, at this point we will not start a cycle and we'll |
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2428 // let the concurrent marking thread complete the last one. |
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2429 } |
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2430 } |
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2431 } |
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2432 |
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2433 void |
342 | 2434 G1CollectorPolicy_BestRegionsFirst:: |
2435 record_collection_pause_start(double start_time_sec, size_t start_used) { | |
2436 G1CollectorPolicy::record_collection_pause_start(start_time_sec, start_used); | |
2437 } | |
2438 | |
2439 class NextNonCSElemFinder: public HeapRegionClosure { | |
2440 HeapRegion* _res; | |
2441 public: | |
2442 NextNonCSElemFinder(): _res(NULL) {} | |
2443 bool doHeapRegion(HeapRegion* r) { | |
2444 if (!r->in_collection_set()) { | |
2445 _res = r; | |
2446 return true; | |
2447 } else { | |
2448 return false; | |
2449 } | |
2450 } | |
2451 HeapRegion* res() { return _res; } | |
2452 }; | |
2453 | |
2454 class KnownGarbageClosure: public HeapRegionClosure { | |
2455 CollectionSetChooser* _hrSorted; | |
2456 | |
2457 public: | |
2458 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
2459 _hrSorted(hrSorted) | |
2460 {} | |
2461 | |
2462 bool doHeapRegion(HeapRegion* r) { | |
2463 // We only include humongous regions in collection | |
2464 // sets when concurrent mark shows that their contained object is | |
2465 // unreachable. | |
2466 | |
2467 // Do we have any marking information for this region? | |
2468 if (r->is_marked()) { | |
2469 // We don't include humongous regions in collection | |
2470 // sets because we collect them immediately at the end of a marking | |
2471 // cycle. We also don't include young regions because we *must* | |
2472 // include them in the next collection pause. | |
2473 if (!r->isHumongous() && !r->is_young()) { | |
2474 _hrSorted->addMarkedHeapRegion(r); | |
2475 } | |
2476 } | |
2477 return false; | |
2478 } | |
2479 }; | |
2480 | |
2481 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
2482 CollectionSetChooser* _hrSorted; | |
2483 jint _marked_regions_added; | |
2484 jint _chunk_size; | |
2485 jint _cur_chunk_idx; | |
2486 jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) | |
2487 int _worker; | |
2488 int _invokes; | |
2489 | |
2490 void get_new_chunk() { | |
2491 _cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size); | |
2492 _cur_chunk_end = _cur_chunk_idx + _chunk_size; | |
2493 } | |
2494 void add_region(HeapRegion* r) { | |
2495 if (_cur_chunk_idx == _cur_chunk_end) { | |
2496 get_new_chunk(); | |
2497 } | |
2498 assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); | |
2499 _hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r); | |
2500 _marked_regions_added++; | |
2501 _cur_chunk_idx++; | |
2502 } | |
2503 | |
2504 public: | |
2505 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
2506 jint chunk_size, | |
2507 int worker) : | |
2508 _hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker), | |
2509 _marked_regions_added(0), _cur_chunk_idx(0), _cur_chunk_end(0), | |
2510 _invokes(0) | |
2511 {} | |
2512 | |
2513 bool doHeapRegion(HeapRegion* r) { | |
2514 // We only include humongous regions in collection | |
2515 // sets when concurrent mark shows that their contained object is | |
2516 // unreachable. | |
2517 _invokes++; | |
2518 | |
2519 // Do we have any marking information for this region? | |
2520 if (r->is_marked()) { | |
2521 // We don't include humongous regions in collection | |
2522 // sets because we collect them immediately at the end of a marking | |
2523 // cycle. | |
2524 // We also do not include young regions in collection sets | |
2525 if (!r->isHumongous() && !r->is_young()) { | |
2526 add_region(r); | |
2527 } | |
2528 } | |
2529 return false; | |
2530 } | |
2531 jint marked_regions_added() { return _marked_regions_added; } | |
2532 int invokes() { return _invokes; } | |
2533 }; | |
2534 | |
2535 class ParKnownGarbageTask: public AbstractGangTask { | |
2536 CollectionSetChooser* _hrSorted; | |
2537 jint _chunk_size; | |
2538 G1CollectedHeap* _g1; | |
2539 public: | |
2540 ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) : | |
2541 AbstractGangTask("ParKnownGarbageTask"), | |
2542 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
2543 _g1(G1CollectedHeap::heap()) | |
2544 {} | |
2545 | |
2546 void work(int i) { | |
2547 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size, i); | |
2548 // Back to zero for the claim value. | |
355 | 2549 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, i, |
2550 HeapRegion::InitialClaimValue); | |
342 | 2551 jint regions_added = parKnownGarbageCl.marked_regions_added(); |
2552 _hrSorted->incNumMarkedHeapRegions(regions_added); | |
2553 if (G1PrintParCleanupStats) { | |
2554 gclog_or_tty->print(" Thread %d called %d times, added %d regions to list.\n", | |
2555 i, parKnownGarbageCl.invokes(), regions_added); | |
2556 } | |
2557 } | |
2558 }; | |
2559 | |
2560 void | |
2561 G1CollectorPolicy_BestRegionsFirst:: | |
2562 record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
2563 size_t max_live_bytes) { | |
2564 double start; | |
2565 if (G1PrintParCleanupStats) start = os::elapsedTime(); | |
2566 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
2567 | |
2568 _collectionSetChooser->clearMarkedHeapRegions(); | |
2569 double clear_marked_end; | |
2570 if (G1PrintParCleanupStats) { | |
2571 clear_marked_end = os::elapsedTime(); | |
2572 gclog_or_tty->print_cr(" clear marked regions + work1: %8.3f ms.", | |
2573 (clear_marked_end - start)*1000.0); | |
2574 } | |
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2575 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 2576 const size_t OverpartitionFactor = 4; |
1571
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2577 const size_t MinWorkUnit = 8; |
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2578 const size_t WorkUnit = |
342 | 2579 MAX2(_g1->n_regions() / (ParallelGCThreads * OverpartitionFactor), |
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2580 MinWorkUnit); |
342 | 2581 _collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(), |
1571
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2582 WorkUnit); |
342 | 2583 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
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2584 (int) WorkUnit); |
342 | 2585 _g1->workers()->run_task(&parKnownGarbageTask); |
355 | 2586 |
2587 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2588 "sanity check"); | |
342 | 2589 } else { |
2590 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
2591 _g1->heap_region_iterate(&knownGarbagecl); | |
2592 } | |
2593 double known_garbage_end; | |
2594 if (G1PrintParCleanupStats) { | |
2595 known_garbage_end = os::elapsedTime(); | |
2596 gclog_or_tty->print_cr(" compute known garbage: %8.3f ms.", | |
2597 (known_garbage_end - clear_marked_end)*1000.0); | |
2598 } | |
2599 _collectionSetChooser->sortMarkedHeapRegions(); | |
2600 double sort_end; | |
2601 if (G1PrintParCleanupStats) { | |
2602 sort_end = os::elapsedTime(); | |
2603 gclog_or_tty->print_cr(" sorting: %8.3f ms.", | |
2604 (sort_end - known_garbage_end)*1000.0); | |
2605 } | |
2606 | |
2607 record_concurrent_mark_cleanup_end_work2(); | |
2608 double work2_end; | |
2609 if (G1PrintParCleanupStats) { | |
2610 work2_end = os::elapsedTime(); | |
2611 gclog_or_tty->print_cr(" work2: %8.3f ms.", | |
2612 (work2_end - sort_end)*1000.0); | |
2613 } | |
2614 } | |
2615 | |
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2616 // Add the heap region at the head of the non-incremental collection set |
342 | 2617 void G1CollectorPolicy:: |
2618 add_to_collection_set(HeapRegion* hr) { | |
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2619 assert(_inc_cset_build_state == Active, "Precondition"); |
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2620 assert(!hr->is_young(), "non-incremental add of young region"); |
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2621 |
1282 | 2622 if (G1PrintHeapRegions) { |
1388 | 2623 gclog_or_tty->print_cr("added region to cset " |
2624 "%d:["PTR_FORMAT", "PTR_FORMAT"], " | |
2625 "top "PTR_FORMAT", %s", | |
2626 hr->hrs_index(), hr->bottom(), hr->end(), | |
2627 hr->top(), hr->is_young() ? "YOUNG" : "NOT_YOUNG"); | |
342 | 2628 } |
2629 | |
2630 if (_g1->mark_in_progress()) | |
2631 _g1->concurrent_mark()->registerCSetRegion(hr); | |
2632 | |
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2633 assert(!hr->in_collection_set(), "should not already be in the CSet"); |
342 | 2634 hr->set_in_collection_set(true); |
2635 hr->set_next_in_collection_set(_collection_set); | |
2636 _collection_set = hr; | |
2637 _collection_set_size++; | |
2638 _collection_set_bytes_used_before += hr->used(); | |
526 | 2639 _g1->register_region_with_in_cset_fast_test(hr); |
342 | 2640 } |
2641 | |
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2642 // Initialize the per-collection-set information |
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2643 void G1CollectorPolicy::start_incremental_cset_building() { |
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2644 assert(_inc_cset_build_state == Inactive, "Precondition"); |
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2645 |
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2646 _inc_cset_head = NULL; |
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2647 _inc_cset_tail = NULL; |
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2648 _inc_cset_size = 0; |
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2649 _inc_cset_bytes_used_before = 0; |
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2650 |
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2651 if (in_young_gc_mode()) { |
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2652 _inc_cset_young_index = 0; |
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2653 } |
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2654 |
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2655 _inc_cset_max_finger = 0; |
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2656 _inc_cset_recorded_young_bytes = 0; |
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2657 _inc_cset_recorded_rs_lengths = 0; |
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2658 _inc_cset_predicted_elapsed_time_ms = 0; |
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2659 _inc_cset_predicted_bytes_to_copy = 0; |
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2660 _inc_cset_build_state = Active; |
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2661 } |
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2662 |
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2663 void G1CollectorPolicy::add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length) { |
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2664 // This routine is used when: |
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2665 // * adding survivor regions to the incremental cset at the end of an |
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2666 // evacuation pause, |
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2667 // * adding the current allocation region to the incremental cset |
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2668 // when it is retired, and |
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2669 // * updating existing policy information for a region in the |
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2670 // incremental cset via young list RSet sampling. |
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2671 // Therefore this routine may be called at a safepoint by the |
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2672 // VM thread, or in-between safepoints by mutator threads (when |
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2673 // retiring the current allocation region) or a concurrent |
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2674 // refine thread (RSet sampling). |
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2675 |
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2676 double region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, true); |
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2677 size_t used_bytes = hr->used(); |
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2678 |
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2679 _inc_cset_recorded_rs_lengths += rs_length; |
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2680 _inc_cset_predicted_elapsed_time_ms += region_elapsed_time_ms; |
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2681 |
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2682 _inc_cset_bytes_used_before += used_bytes; |
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2683 |
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2684 // Cache the values we have added to the aggregated informtion |
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2685 // in the heap region in case we have to remove this region from |
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2686 // the incremental collection set, or it is updated by the |
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2687 // rset sampling code |
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2688 hr->set_recorded_rs_length(rs_length); |
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2689 hr->set_predicted_elapsed_time_ms(region_elapsed_time_ms); |
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2690 |
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2691 #if PREDICTIONS_VERBOSE |
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2692 size_t bytes_to_copy = predict_bytes_to_copy(hr); |
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2693 _inc_cset_predicted_bytes_to_copy += bytes_to_copy; |
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2694 |
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2695 // Record the number of bytes used in this region |
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2696 _inc_cset_recorded_young_bytes += used_bytes; |
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2697 |
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2698 // Cache the values we have added to the aggregated informtion |
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2699 // in the heap region in case we have to remove this region from |
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2700 // the incremental collection set, or it is updated by the |
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2701 // rset sampling code |
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2702 hr->set_predicted_bytes_to_copy(bytes_to_copy); |
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2703 #endif // PREDICTIONS_VERBOSE |
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2704 } |
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2705 |
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2706 void G1CollectorPolicy::remove_from_incremental_cset_info(HeapRegion* hr) { |
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2707 // This routine is currently only called as part of the updating of |
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2708 // existing policy information for regions in the incremental cset that |
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2709 // is performed by the concurrent refine thread(s) as part of young list |
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2710 // RSet sampling. Therefore we should not be at a safepoint. |
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2711 |
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2712 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); |
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2713 assert(hr->is_young(), "it should be"); |
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2714 |
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2715 size_t used_bytes = hr->used(); |
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2716 size_t old_rs_length = hr->recorded_rs_length(); |
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|
2717 double old_elapsed_time_ms = hr->predicted_elapsed_time_ms(); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2718 |
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 // 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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diff
changeset
|
2720 // 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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diff
changeset
|
2721 _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:
1391
diff
changeset
|
2722 _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
johnc
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:
1391
diff
changeset
|
2724 _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
|
2725 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2726 // 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
|
2727 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:
1391
diff
changeset
|
2728 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
|
2729 |
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
|
2730 #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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diff
changeset
|
2731 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
|
2732 _inc_cset_predicted_bytes_to_copy -= old_predicted_bytes_to_copy; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2733 |
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 // Subtract the number of bytes used in this region |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2735 _inc_cset_recorded_young_bytes -= used_bytes; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2736 |
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 // Clear the values cached in the heap region |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2738 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
|
2739 #endif // 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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diff
changeset
|
2740 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2741 |
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 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
|
2743 // 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:
1391
diff
changeset
|
2744 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
|
2745 |
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
|
2746 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:
1391
diff
changeset
|
2747 add_to_incremental_cset_info(hr, new_rs_length); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2748 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2749 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2750 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
|
2751 assert( hr->is_young(), "invariant"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2752 assert( hr->young_index_in_cset() == -1, "invariant" ); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2753 assert(_inc_cset_build_state == Active, "Precondition"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2754 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2755 // We need to clear and set the cached recorded/cached collection set |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2756 // information in the heap region here (before the region gets added |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2757 // to the collection set). An individual heap region's cached values |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2758 // are calculated, aggregated with the policy collection set info, |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2759 // and cached in the heap region here (initially) and (subsequently) |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2760 // by the Young List sampling code. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2761 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2762 size_t rs_length = hr->rem_set()->occupied(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2763 add_to_incremental_cset_info(hr, rs_length); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2764 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2765 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
|
2766 _inc_cset_max_finger = MAX2(_inc_cset_max_finger, hr_end); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2767 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2768 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
|
2769 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
|
2770 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
|
2771 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2772 _inc_cset_size++; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2773 _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
|
2774 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2775 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
|
2776 ++_inc_cset_young_index; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2777 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2778 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2779 // 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
|
2780 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
|
2781 // 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
|
2782 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
|
2783 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2784 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2785 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
|
2786 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2787 // 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
|
2788 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
|
2789 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
|
2790 _inc_cset_head = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2791 } else { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2792 _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
|
2793 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2794 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2795 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2796 if (G1PrintHeapRegions) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2797 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
|
2798 "%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
|
2799 "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
|
2800 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
|
2801 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
|
2802 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2803 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2804 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2805 // 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
|
2806 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
|
2807 // 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
|
2808 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
|
2809 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2810 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2811 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
|
2812 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2813 // 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
|
2814 hr->set_next_in_collection_set(_inc_cset_head); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2815 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
|
2816 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
|
2817 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2818 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2819 _inc_cset_head = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2820 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2821 if (G1PrintHeapRegions) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2822 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
|
2823 "%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
|
2824 "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
|
2825 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
|
2826 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
|
2827 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2828 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2829 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2830 #ifndef PRODUCT |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2831 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
|
2832 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
|
2833 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2834 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
|
2835 HeapRegion* csr = list_head; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2836 while (csr != NULL) { |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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2837 HeapRegion* next = csr->next_in_collection_set(); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2838 assert(csr->in_collection_set(), "bad CS"); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2839 st->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2840 "age: %4d, y: %d, surv: %d", |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2841 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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|
2842 csr->top(), |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
2843 csr->prev_top_at_mark_start(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2844 csr->next_top_at_mark_start(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2845 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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|
2846 csr->age_in_surv_rate_group_cond(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2847 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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|
2848 csr->is_survivor()); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2849 csr = next; |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2850 } |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2851 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2852 #endif // !PRODUCT |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2853 |
1707 | 2854 void |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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diff
changeset
|
2855 G1CollectorPolicy_BestRegionsFirst::choose_collection_set( |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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changeset
|
2856 double target_pause_time_ms) { |
1394
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2857 // Set this here - in case we're not doing young collections. |
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2858 double non_young_start_time_sec = os::elapsedTime(); |
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2859 |
342 | 2860 start_recording_regions(); |
2861 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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|
2862 guarantee(target_pause_time_ms > 0.0, |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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|
2863 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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|
2864 target_pause_time_ms)); |
4e5661ba9d98
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tonyp
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diff
changeset
|
2865 guarantee(_collection_set == NULL, "Precondition"); |
342 | 2866 |
2867 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
2868 double predicted_pause_time_ms = base_time_ms; | |
2869 | |
1656
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|
2870 double time_remaining_ms = target_pause_time_ms - base_time_ms; |
342 | 2871 |
2872 // the 10% and 50% values are arbitrary... | |
1656
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changeset
|
2873 if (time_remaining_ms < 0.10 * target_pause_time_ms) { |
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|
2874 time_remaining_ms = 0.50 * target_pause_time_ms; |
342 | 2875 _within_target = false; |
2876 } else { | |
2877 _within_target = true; | |
2878 } | |
2879 | |
2880 // We figure out the number of bytes available for future to-space. | |
2881 // For new regions without marking information, we must assume the | |
2882 // worst-case of complete survival. If we have marking information for a | |
2883 // region, we can bound the amount of live data. We can add a number of | |
2884 // such regions, as long as the sum of the live data bounds does not | |
2885 // exceed the available evacuation space. | |
2886 size_t max_live_bytes = _g1->free_regions() * HeapRegion::GrainBytes; | |
2887 | |
2888 size_t expansion_bytes = | |
2889 _g1->expansion_regions() * HeapRegion::GrainBytes; | |
2890 | |
677 | 2891 _collection_set_bytes_used_before = 0; |
2892 _collection_set_size = 0; | |
342 | 2893 |
2894 // Adjust for expansion and slop. | |
2895 max_live_bytes = max_live_bytes + expansion_bytes; | |
2896 | |
677 | 2897 assert(_g1->regions_accounted_for(), "Region leakage!"); |
342 | 2898 |
2899 HeapRegion* hr; | |
2900 if (in_young_gc_mode()) { | |
2901 double young_start_time_sec = os::elapsedTime(); | |
2902 | |
2903 if (G1PolicyVerbose > 0) { | |
2904 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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|
2905 _g1->young_list()->length()); |
342 | 2906 } |
1394
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|
2907 |
342 | 2908 _young_cset_length = 0; |
2909 _last_young_gc_full = full_young_gcs() ? true : false; | |
1394
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|
2910 |
342 | 2911 if (_last_young_gc_full) |
2912 ++_full_young_pause_num; | |
2913 else | |
2914 ++_partial_young_pause_num; | |
1394
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2915 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2916 // The young list is laid with the survivor regions from the previous |
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|
2917 // pause are appended to the RHS of the young list, i.e. |
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diff
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|
2918 // [Newly Young Regions ++ Survivors from last pause]. |
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|
2919 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2920 hr = _g1->young_list()->first_survivor_region(); |
342 | 2921 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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parents:
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|
2922 assert(hr->is_survivor(), "badly formed young list"); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
2923 hr->set_young(); |
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diff
changeset
|
2924 hr = hr->get_next_young_region(); |
342 | 2925 } |
2926 | |
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
|
2927 // Clear the fields that point to the survivor list - they are |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2928 // all young now. |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2929 _g1->young_list()->clear_survivors(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2930 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2931 if (_g1->mark_in_progress()) |
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
|
2932 _g1->concurrent_mark()->register_collection_set_finger(_inc_cset_max_finger); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2933 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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diff
changeset
|
2934 _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:
1391
diff
changeset
|
2935 _collection_set = _inc_cset_head; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2936 _collection_set_size = _inc_cset_size; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2937 _collection_set_bytes_used_before = _inc_cset_bytes_used_before; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2938 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2939 // For young regions in the collection set, we assume the worst |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2940 // case of complete survival |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2941 max_live_bytes -= _inc_cset_size * HeapRegion::GrainBytes; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2942 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2943 time_remaining_ms -= _inc_cset_predicted_elapsed_time_ms; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2944 predicted_pause_time_ms += _inc_cset_predicted_elapsed_time_ms; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2945 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2946 // The number of recorded young regions is the incremental |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2947 // collection set's current size |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2948 set_recorded_young_regions(_inc_cset_size); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2949 set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2950 set_recorded_young_bytes(_inc_cset_recorded_young_bytes); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2951 #if PREDICTIONS_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2952 set_predicted_bytes_to_copy(_inc_cset_predicted_bytes_to_copy); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2953 #endif // PREDICTIONS_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2954 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2955 if (G1PolicyVerbose > 0) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2956 gclog_or_tty->print_cr(" Added " PTR_FORMAT " Young Regions to CS.", |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2957 _inc_cset_size); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2958 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
|
2959 max_live_bytes/K); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2960 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2961 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2962 assert(_inc_cset_size == _g1->young_list()->length(), "Invariant"); |
342 | 2963 |
2964 double young_end_time_sec = os::elapsedTime(); | |
2965 _recorded_young_cset_choice_time_ms = | |
2966 (young_end_time_sec - young_start_time_sec) * 1000.0; | |
2967 | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2968 // 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
|
2969 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:
1391
diff
changeset
|
2970 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2971 // 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
|
2972 // _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
|
2973 if (_collection_set_size > 0 && _last_young_gc_full) { |
342 | 2974 // don't bother adding more regions... |
2975 goto choose_collection_set_end; | |
2976 } | |
2977 } | |
2978 | |
2979 if (!in_young_gc_mode() || !full_young_gcs()) { | |
2980 bool should_continue = true; | |
2981 NumberSeq seq; | |
2982 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
|
2983 |
342 | 2984 do { |
2985 hr = _collectionSetChooser->getNextMarkedRegion(time_remaining_ms, | |
2986 avg_prediction); | |
677 | 2987 if (hr != NULL) { |
342 | 2988 double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
2989 time_remaining_ms -= predicted_time_ms; | |
2990 predicted_pause_time_ms += predicted_time_ms; | |
2991 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
|
2992 record_non_young_cset_region(hr); |
342 | 2993 max_live_bytes -= MIN2(hr->max_live_bytes(), max_live_bytes); |
2994 if (G1PolicyVerbose > 0) { | |
2995 gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", | |
2996 max_live_bytes/K); | |
2997 } | |
2998 seq.add(predicted_time_ms); | |
2999 avg_prediction = seq.avg() + seq.sd(); | |
3000 } | |
3001 should_continue = | |
3002 ( hr != NULL) && | |
3003 ( (adaptive_young_list_length()) ? time_remaining_ms > 0.0 | |
3004 : _collection_set_size < _young_list_fixed_length ); | |
3005 } while (should_continue); | |
3006 | |
3007 if (!adaptive_young_list_length() && | |
3008 _collection_set_size < _young_list_fixed_length) | |
3009 _should_revert_to_full_young_gcs = true; | |
3010 } | |
3011 | |
3012 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:
1391
diff
changeset
|
3013 stop_incremental_cset_building(); |
1316cec51b4d
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diff
changeset
|
3014 |
342 | 3015 count_CS_bytes_used(); |
3016 | |
3017 end_recording_regions(); | |
3018 | |
3019 double non_young_end_time_sec = os::elapsedTime(); | |
3020 _recorded_non_young_cset_choice_time_ms = | |
3021 (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; | |
3022 } | |
3023 | |
3024 void G1CollectorPolicy_BestRegionsFirst::record_full_collection_end() { | |
3025 G1CollectorPolicy::record_full_collection_end(); | |
3026 _collectionSetChooser->updateAfterFullCollection(); | |
3027 } | |
3028 | |
3029 void G1CollectorPolicy_BestRegionsFirst:: | |
3030 expand_if_possible(size_t numRegions) { | |
3031 size_t expansion_bytes = numRegions * HeapRegion::GrainBytes; | |
3032 _g1->expand(expansion_bytes); | |
3033 } | |
3034 | |
3035 void G1CollectorPolicy_BestRegionsFirst:: | |
1707 | 3036 record_collection_pause_end() { |
3037 G1CollectorPolicy::record_collection_pause_end(); | |
342 | 3038 assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end."); |
3039 } |