Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 3687:7958ebb561b0
Merge
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Fri, 18 Nov 2011 17:20:38 +0100 |
parents | 5c0b591e1074 |
children | 053d84a76d3d |
rev | line source |
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342 | 1 /* |
2152 | 2 * Copyright (c) 2001, 2011, 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 | |
2363
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84 // Help class for avoiding interleaved logging |
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85 class LineBuffer: public StackObj { |
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86 |
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87 private: |
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88 static const int BUFFER_LEN = 1024; |
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89 static const int INDENT_CHARS = 3; |
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90 char _buffer[BUFFER_LEN]; |
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91 int _indent_level; |
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92 int _cur; |
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93 |
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94 void vappend(const char* format, va_list ap) { |
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95 int res = vsnprintf(&_buffer[_cur], BUFFER_LEN - _cur, format, ap); |
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96 if (res != -1) { |
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97 _cur += res; |
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98 } else { |
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99 DEBUG_ONLY(warning("buffer too small in LineBuffer");) |
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100 _buffer[BUFFER_LEN -1] = 0; |
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101 _cur = BUFFER_LEN; // vsnprintf above should not add to _buffer if we are called again |
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102 } |
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103 } |
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104 |
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105 public: |
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106 explicit LineBuffer(int indent_level): _indent_level(indent_level), _cur(0) { |
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107 for (; (_cur < BUFFER_LEN && _cur < (_indent_level * INDENT_CHARS)); _cur++) { |
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108 _buffer[_cur] = ' '; |
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109 } |
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110 } |
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111 |
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112 #ifndef PRODUCT |
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113 ~LineBuffer() { |
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114 assert(_cur == _indent_level * INDENT_CHARS, "pending data in buffer - append_and_print_cr() not called?"); |
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115 } |
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116 #endif |
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117 |
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118 void append(const char* format, ...) { |
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119 va_list ap; |
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120 va_start(ap, format); |
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121 vappend(format, ap); |
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122 va_end(ap); |
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123 } |
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124 |
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125 void append_and_print_cr(const char* format, ...) { |
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126 va_list ap; |
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127 va_start(ap, format); |
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128 vappend(format, ap); |
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129 va_end(ap); |
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130 gclog_or_tty->print_cr("%s", _buffer); |
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131 _cur = _indent_level * INDENT_CHARS; |
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132 } |
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133 }; |
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134 |
342 | 135 G1CollectorPolicy::G1CollectorPolicy() : |
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136 _parallel_gc_threads(G1CollectedHeap::use_parallel_gc_threads() |
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137 ? ParallelGCThreads : 1), |
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138 |
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139 |
342 | 140 _n_pauses(0), |
141 _recent_CH_strong_roots_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
142 _recent_G1_strong_roots_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
143 _recent_evac_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
144 _recent_pause_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
145 _recent_rs_sizes(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
146 _recent_gc_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
147 _all_pause_times_ms(new NumberSeq()), | |
148 _stop_world_start(0.0), | |
149 _all_stop_world_times_ms(new NumberSeq()), | |
150 _all_yield_times_ms(new NumberSeq()), | |
151 | |
152 _all_mod_union_times_ms(new NumberSeq()), | |
153 | |
677 | 154 _summary(new Summary()), |
342 | 155 |
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156 #ifndef PRODUCT |
342 | 157 _cur_clear_ct_time_ms(0.0), |
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158 _min_clear_cc_time_ms(-1.0), |
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159 _max_clear_cc_time_ms(-1.0), |
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160 _cur_clear_cc_time_ms(0.0), |
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161 _cum_clear_cc_time_ms(0.0), |
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162 _num_cc_clears(0L), |
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163 #endif |
342 | 164 |
165 _region_num_young(0), | |
166 _region_num_tenured(0), | |
167 _prev_region_num_young(0), | |
168 _prev_region_num_tenured(0), | |
169 | |
170 _aux_num(10), | |
171 _all_aux_times_ms(new NumberSeq[_aux_num]), | |
172 _cur_aux_start_times_ms(new double[_aux_num]), | |
173 _cur_aux_times_ms(new double[_aux_num]), | |
174 _cur_aux_times_set(new bool[_aux_num]), | |
175 | |
176 _concurrent_mark_init_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
177 _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
178 _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
179 | |
180 // <NEW PREDICTION> | |
181 | |
182 _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
183 _prev_collection_pause_end_ms(0.0), | |
184 _pending_card_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
185 _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
186 _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
187 _fully_young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), | |
188 _partially_young_cards_per_entry_ratio_seq( | |
189 new TruncatedSeq(TruncatedSeqLength)), | |
190 _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
191 _partially_young_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
192 _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
193 _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
194 _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
195 _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
196 _non_young_other_cost_per_region_ms_seq( | |
197 new TruncatedSeq(TruncatedSeqLength)), | |
198 | |
199 _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
200 _scanned_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
201 _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), | |
202 | |
751 | 203 _pause_time_target_ms((double) MaxGCPauseMillis), |
342 | 204 |
205 // </NEW PREDICTION> | |
206 | |
207 _in_young_gc_mode(false), | |
208 _full_young_gcs(true), | |
209 _full_young_pause_num(0), | |
210 _partial_young_pause_num(0), | |
211 | |
212 _during_marking(false), | |
213 _in_marking_window(false), | |
214 _in_marking_window_im(false), | |
215 | |
216 _known_garbage_ratio(0.0), | |
217 _known_garbage_bytes(0), | |
218 | |
219 _young_gc_eff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
220 | |
221 _recent_prev_end_times_for_all_gcs_sec(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
222 | |
223 _recent_CS_bytes_used_before(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
224 _recent_CS_bytes_surviving(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
225 | |
226 _recent_avg_pause_time_ratio(0.0), | |
227 _num_markings(0), | |
228 _n_marks(0), | |
229 _n_pauses_at_mark_end(0), | |
230 | |
231 _all_full_gc_times_ms(new NumberSeq()), | |
232 | |
233 // G1PausesBtwnConcMark defaults to -1 | |
234 // so the hack is to do the cast QQQ FIXME | |
235 _pauses_btwn_concurrent_mark((size_t)G1PausesBtwnConcMark), | |
236 _n_marks_since_last_pause(0), | |
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237 _initiate_conc_mark_if_possible(false), |
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238 _during_initial_mark_pause(false), |
342 | 239 _should_revert_to_full_young_gcs(false), |
240 _last_full_young_gc(false), | |
241 | |
242 _prev_collection_pause_used_at_end_bytes(0), | |
243 | |
244 _collection_set(NULL), | |
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245 _collection_set_size(0), |
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246 _collection_set_bytes_used_before(0), |
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247 |
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248 // Incremental CSet attributes |
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249 _inc_cset_build_state(Inactive), |
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250 _inc_cset_head(NULL), |
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251 _inc_cset_tail(NULL), |
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252 _inc_cset_size(0), |
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253 _inc_cset_young_index(0), |
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254 _inc_cset_bytes_used_before(0), |
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255 _inc_cset_max_finger(NULL), |
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256 _inc_cset_recorded_young_bytes(0), |
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257 _inc_cset_recorded_rs_lengths(0), |
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258 _inc_cset_predicted_elapsed_time_ms(0.0), |
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259 _inc_cset_predicted_bytes_to_copy(0), |
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260 |
342 | 261 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
262 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
263 #endif // _MSC_VER | |
264 | |
265 _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", | |
266 G1YoungSurvRateNumRegionsSummary)), | |
267 _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", | |
545 | 268 G1YoungSurvRateNumRegionsSummary)), |
342 | 269 // add here any more surv rate groups |
545 | 270 _recorded_survivor_regions(0), |
271 _recorded_survivor_head(NULL), | |
272 _recorded_survivor_tail(NULL), | |
1356 | 273 _survivors_age_table(true), |
274 | |
275 _gc_overhead_perc(0.0) | |
545 | 276 |
342 | 277 { |
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278 // Set up the region size and associated fields. Given that the |
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279 // policy is created before the heap, we have to set this up here, |
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280 // so it's done as soon as possible. |
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281 HeapRegion::setup_heap_region_size(Arguments::min_heap_size()); |
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282 HeapRegionRemSet::setup_remset_size(); |
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283 |
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284 // Verify PLAB sizes |
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285 const uint region_size = HeapRegion::GrainWords; |
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286 if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
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287 char buffer[128]; |
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288 jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most %u", |
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289 OldPLABSize > region_size ? "Old" : "Young", region_size); |
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290 vm_exit_during_initialization(buffer); |
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291 } |
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292 |
342 | 293 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
294 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
295 | |
1611 | 296 _par_last_gc_worker_start_times_ms = new double[_parallel_gc_threads]; |
342 | 297 _par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads]; |
298 _par_last_mark_stack_scan_times_ms = new double[_parallel_gc_threads]; | |
299 | |
300 _par_last_update_rs_times_ms = new double[_parallel_gc_threads]; | |
301 _par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; | |
302 | |
303 _par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; | |
304 | |
305 _par_last_obj_copy_times_ms = new double[_parallel_gc_threads]; | |
306 | |
307 _par_last_termination_times_ms = new double[_parallel_gc_threads]; | |
1611 | 308 _par_last_termination_attempts = new double[_parallel_gc_threads]; |
309 _par_last_gc_worker_end_times_ms = new double[_parallel_gc_threads]; | |
2430 | 310 _par_last_gc_worker_times_ms = new double[_parallel_gc_threads]; |
342 | 311 |
312 // start conservatively | |
751 | 313 _expensive_region_limit_ms = 0.5 * (double) MaxGCPauseMillis; |
342 | 314 |
315 // <NEW PREDICTION> | |
316 | |
317 int index; | |
318 if (ParallelGCThreads == 0) | |
319 index = 0; | |
320 else if (ParallelGCThreads > 8) | |
321 index = 7; | |
322 else | |
323 index = ParallelGCThreads - 1; | |
324 | |
325 _pending_card_diff_seq->add(0.0); | |
326 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
327 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
328 _fully_young_cards_per_entry_ratio_seq->add( | |
329 fully_young_cards_per_entry_ratio_defaults[index]); | |
330 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); | |
331 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
332 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
333 _young_other_cost_per_region_ms_seq->add( | |
334 young_other_cost_per_region_ms_defaults[index]); | |
335 _non_young_other_cost_per_region_ms_seq->add( | |
336 non_young_other_cost_per_region_ms_defaults[index]); | |
337 | |
338 // </NEW PREDICTION> | |
339 | |
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340 // Below, we might need to calculate the pause time target based on |
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341 // the pause interval. When we do so we are going to give G1 maximum |
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342 // flexibility and allow it to do pauses when it needs to. So, we'll |
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343 // arrange that the pause interval to be pause time target + 1 to |
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344 // ensure that a) the pause time target is maximized with respect to |
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345 // the pause interval and b) we maintain the invariant that pause |
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346 // time target < pause interval. If the user does not want this |
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347 // maximum flexibility, they will have to set the pause interval |
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348 // explicitly. |
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349 |
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350 // First make sure that, if either parameter is set, its value is |
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351 // reasonable. |
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352 if (!FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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353 if (MaxGCPauseMillis < 1) { |
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354 vm_exit_during_initialization("MaxGCPauseMillis should be " |
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355 "greater than 0"); |
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356 } |
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357 } |
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358 if (!FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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359 if (GCPauseIntervalMillis < 1) { |
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360 vm_exit_during_initialization("GCPauseIntervalMillis should be " |
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361 "greater than 0"); |
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362 } |
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363 } |
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364 |
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365 // Then, if the pause time target parameter was not set, set it to |
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366 // the default value. |
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367 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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368 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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369 // The default pause time target in G1 is 200ms |
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370 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); |
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371 } else { |
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372 // We do not allow the pause interval to be set without the |
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373 // pause time target |
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374 vm_exit_during_initialization("GCPauseIntervalMillis cannot be set " |
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375 "without setting MaxGCPauseMillis"); |
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376 } |
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377 } |
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378 |
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379 // Then, if the interval parameter was not set, set it according to |
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380 // the pause time target (this will also deal with the case when the |
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381 // pause time target is the default value). |
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382 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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383 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); |
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384 } |
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385 |
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386 // Finally, make sure that the two parameters are consistent. |
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387 if (MaxGCPauseMillis >= GCPauseIntervalMillis) { |
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388 char buffer[256]; |
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389 jio_snprintf(buffer, 256, |
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390 "MaxGCPauseMillis (%u) should be less than " |
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391 "GCPauseIntervalMillis (%u)", |
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392 MaxGCPauseMillis, GCPauseIntervalMillis); |
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393 vm_exit_during_initialization(buffer); |
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394 } |
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395 |
751 | 396 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; |
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397 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
342 | 398 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); |
751 | 399 _sigma = (double) G1ConfidencePercent / 100.0; |
342 | 400 |
401 // start conservatively (around 50ms is about right) | |
402 _concurrent_mark_init_times_ms->add(0.05); | |
403 _concurrent_mark_remark_times_ms->add(0.05); | |
404 _concurrent_mark_cleanup_times_ms->add(0.20); | |
405 _tenuring_threshold = MaxTenuringThreshold; | |
406 | |
1282 | 407 // if G1FixedSurvivorSpaceSize is 0 which means the size is not |
408 // fixed, then _max_survivor_regions will be calculated at | |
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409 // calculate_young_list_target_length during initialization |
1282 | 410 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
545 | 411 |
1356 | 412 assert(GCTimeRatio > 0, |
413 "we should have set it to a default value set_g1_gc_flags() " | |
414 "if a user set it to 0"); | |
415 _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); | |
416 | |
342 | 417 initialize_all(); |
418 } | |
419 | |
420 // Increment "i", mod "len" | |
421 static void inc_mod(int& i, int len) { | |
422 i++; if (i == len) i = 0; | |
423 } | |
424 | |
425 void G1CollectorPolicy::initialize_flags() { | |
426 set_min_alignment(HeapRegion::GrainBytes); | |
427 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
547
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428 if (SurvivorRatio < 1) { |
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429 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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430 } |
342 | 431 CollectorPolicy::initialize_flags(); |
432 } | |
433 | |
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434 // The easiest way to deal with the parsing of the NewSize / |
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435 // MaxNewSize / etc. parameteres is to re-use the code in the |
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436 // TwoGenerationCollectorPolicy class. This is similar to what |
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437 // ParallelScavenge does with its GenerationSizer class (see |
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438 // ParallelScavengeHeap::initialize()). We might change this in the |
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439 // future, but it's a good start. |
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440 class G1YoungGenSizer : public TwoGenerationCollectorPolicy { |
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441 size_t size_to_region_num(size_t byte_size) { |
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442 return MAX2((size_t) 1, byte_size / HeapRegion::GrainBytes); |
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443 } |
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444 |
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445 public: |
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446 G1YoungGenSizer() { |
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447 initialize_flags(); |
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448 initialize_size_info(); |
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449 } |
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450 |
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451 size_t min_young_region_num() { |
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452 return size_to_region_num(_min_gen0_size); |
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453 } |
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454 size_t initial_young_region_num() { |
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455 return size_to_region_num(_initial_gen0_size); |
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456 } |
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457 size_t max_young_region_num() { |
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458 return size_to_region_num(_max_gen0_size); |
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459 } |
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460 }; |
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461 |
342 | 462 void G1CollectorPolicy::init() { |
463 // Set aside an initial future to_space. | |
464 _g1 = G1CollectedHeap::heap(); | |
465 | |
466 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
467 | |
545 | 468 initialize_gc_policy_counters(); |
469 | |
342 | 470 if (G1Gen) { |
471 _in_young_gc_mode = true; | |
472 | |
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473 G1YoungGenSizer sizer; |
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474 size_t initial_region_num = sizer.initial_young_region_num(); |
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475 |
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476 if (UseAdaptiveSizePolicy) { |
342 | 477 set_adaptive_young_list_length(true); |
478 _young_list_fixed_length = 0; | |
479 } else { | |
480 set_adaptive_young_list_length(false); | |
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481 _young_list_fixed_length = initial_region_num; |
342 | 482 } |
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483 _free_regions_at_end_of_collection = _g1->free_regions(); |
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484 calculate_young_list_min_length(); |
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485 guarantee( _young_list_min_length == 0, "invariant, not enough info" ); |
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486 calculate_young_list_target_length(); |
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487 } else { |
342 | 488 _young_list_fixed_length = 0; |
489 _in_young_gc_mode = false; | |
490 } | |
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491 |
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492 // We may immediately start allocating regions and placing them on the |
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493 // collection set list. Initialize the per-collection set info |
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494 start_incremental_cset_building(); |
342 | 495 } |
496 | |
545 | 497 // Create the jstat counters for the policy. |
498 void G1CollectorPolicy::initialize_gc_policy_counters() | |
499 { | |
500 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 2 + G1Gen); | |
501 } | |
502 | |
342 | 503 void G1CollectorPolicy::calculate_young_list_min_length() { |
504 _young_list_min_length = 0; | |
505 | |
506 if (!adaptive_young_list_length()) | |
507 return; | |
508 | |
509 if (_alloc_rate_ms_seq->num() > 3) { | |
510 double now_sec = os::elapsedTime(); | |
511 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; | |
512 double alloc_rate_ms = predict_alloc_rate_ms(); | |
1973 | 513 size_t min_regions = (size_t) ceil(alloc_rate_ms * when_ms); |
514 size_t current_region_num = _g1->young_list()->length(); | |
342 | 515 _young_list_min_length = min_regions + current_region_num; |
516 } | |
517 } | |
518 | |
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519 void G1CollectorPolicy::calculate_young_list_target_length() { |
342 | 520 if (adaptive_young_list_length()) { |
521 size_t rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); | |
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522 calculate_young_list_target_length(rs_lengths); |
342 | 523 } else { |
524 if (full_young_gcs()) | |
525 _young_list_target_length = _young_list_fixed_length; | |
526 else | |
527 _young_list_target_length = _young_list_fixed_length / 2; | |
528 } | |
1973 | 529 |
530 // Make sure we allow the application to allocate at least one | |
531 // region before we need to do a collection again. | |
532 size_t min_length = _g1->young_list()->length() + 1; | |
533 _young_list_target_length = MAX2(_young_list_target_length, min_length); | |
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534 calculate_max_gc_locker_expansion(); |
545 | 535 calculate_survivors_policy(); |
342 | 536 } |
537 | |
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538 void G1CollectorPolicy::calculate_young_list_target_length(size_t rs_lengths) { |
342 | 539 guarantee( adaptive_young_list_length(), "pre-condition" ); |
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540 guarantee( !_in_marking_window || !_last_full_young_gc, "invariant" ); |
342 | 541 |
542 double start_time_sec = os::elapsedTime(); | |
1282 | 543 size_t min_reserve_perc = MAX2((size_t)2, (size_t)G1ReservePercent); |
342 | 544 min_reserve_perc = MIN2((size_t) 50, min_reserve_perc); |
545 size_t reserve_regions = | |
546 (size_t) ((double) min_reserve_perc * (double) _g1->n_regions() / 100.0); | |
547 | |
548 if (full_young_gcs() && _free_regions_at_end_of_collection > 0) { | |
549 // we are in fully-young mode and there are free regions in the heap | |
550 | |
545 | 551 double survivor_regions_evac_time = |
552 predict_survivor_regions_evac_time(); | |
553 | |
342 | 554 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
555 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); | |
556 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); | |
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557 size_t scanned_cards = predict_young_card_num(adj_rs_lengths); |
545 | 558 double base_time_ms = predict_base_elapsed_time_ms(pending_cards, scanned_cards) |
559 + survivor_regions_evac_time; | |
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560 |
342 | 561 // the result |
562 size_t final_young_length = 0; | |
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563 |
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564 size_t init_free_regions = |
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565 MAX2((size_t)0, _free_regions_at_end_of_collection - reserve_regions); |
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566 |
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567 // if we're still under the pause target... |
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568 if (base_time_ms <= target_pause_time_ms) { |
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569 // We make sure that the shortest young length that makes sense |
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570 // fits within the target pause time. |
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571 size_t min_young_length = 1; |
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572 |
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573 if (predict_will_fit(min_young_length, base_time_ms, |
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574 init_free_regions, target_pause_time_ms)) { |
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575 // The shortest young length will fit within the target pause time; |
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576 // we'll now check whether the absolute maximum number of young |
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577 // regions will fit in the target pause time. If not, we'll do |
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578 // a binary search between min_young_length and max_young_length |
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579 size_t abs_max_young_length = _free_regions_at_end_of_collection - 1; |
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580 size_t max_young_length = abs_max_young_length; |
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581 |
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582 if (max_young_length > min_young_length) { |
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583 // Let's check if the initial max young length will fit within the |
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584 // target pause. If so then there is no need to search for a maximal |
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585 // young length - we'll return the initial maximum |
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586 |
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587 if (predict_will_fit(max_young_length, base_time_ms, |
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588 init_free_regions, target_pause_time_ms)) { |
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589 // The maximum young length will satisfy the target pause time. |
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590 // We are done so set min young length to this maximum length. |
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591 // The code after the loop will then set final_young_length using |
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592 // the value cached in the minimum length. |
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593 min_young_length = max_young_length; |
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594 } else { |
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595 // The maximum possible number of young regions will not fit within |
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596 // the target pause time so let's search.... |
342 | 597 |
598 size_t diff = (max_young_length - min_young_length) / 2; | |
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599 max_young_length = min_young_length + diff; |
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600 |
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601 while (max_young_length > min_young_length) { |
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602 if (predict_will_fit(max_young_length, base_time_ms, |
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603 init_free_regions, target_pause_time_ms)) { |
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604 |
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605 // The current max young length will fit within the target |
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606 // pause time. Note we do not exit the loop here. By setting |
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607 // min = max, and then increasing the max below means that |
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608 // we will continue searching for an upper bound in the |
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609 // range [max..max+diff] |
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610 min_young_length = max_young_length; |
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611 } |
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612 diff = (max_young_length - min_young_length) / 2; |
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613 max_young_length = min_young_length + diff; |
342 | 614 } |
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615 // the above loop found a maximal young length that will fit |
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616 // within the target pause time. |
342 | 617 } |
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618 assert(min_young_length <= abs_max_young_length, "just checking"); |
342 | 619 } |
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620 final_young_length = min_young_length; |
342 | 621 } |
622 } | |
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623 // and we're done! |
342 | 624 |
625 // we should have at least one region in the target young length | |
545 | 626 _young_list_target_length = |
1973 | 627 final_young_length + _recorded_survivor_regions; |
342 | 628 |
629 // let's keep an eye of how long we spend on this calculation | |
630 // right now, I assume that we'll print it when we need it; we | |
631 // should really adde it to the breakdown of a pause | |
632 double end_time_sec = os::elapsedTime(); | |
633 double elapsed_time_ms = (end_time_sec - start_time_sec) * 1000.0; | |
634 | |
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635 #ifdef TRACE_CALC_YOUNG_LENGTH |
342 | 636 // leave this in for debugging, just in case |
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637 gclog_or_tty->print_cr("target = %1.1lf ms, young = " SIZE_FORMAT ", " |
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638 "elapsed %1.2lf ms, (%s%s) " SIZE_FORMAT SIZE_FORMAT, |
342 | 639 target_pause_time_ms, |
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640 _young_list_target_length |
342 | 641 elapsed_time_ms, |
642 full_young_gcs() ? "full" : "partial", | |
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643 during_initial_mark_pause() ? " i-m" : "", |
545 | 644 _in_marking_window, |
645 _in_marking_window_im); | |
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646 #endif // TRACE_CALC_YOUNG_LENGTH |
342 | 647 |
648 if (_young_list_target_length < _young_list_min_length) { | |
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649 // bummer; this means that, if we do a pause when the maximal |
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650 // length dictates, we'll violate the pause spacing target (the |
342 | 651 // min length was calculate based on the application's current |
652 // alloc rate); | |
653 | |
654 // so, we have to bite the bullet, and allocate the minimum | |
655 // number. We'll violate our target, but we just can't meet it. | |
656 | |
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657 #ifdef TRACE_CALC_YOUNG_LENGTH |
342 | 658 // leave this in for debugging, just in case |
659 gclog_or_tty->print_cr("adjusted target length from " | |
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660 SIZE_FORMAT " to " SIZE_FORMAT, |
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661 _young_list_target_length, _young_list_min_length); |
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662 #endif // TRACE_CALC_YOUNG_LENGTH |
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663 |
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664 _young_list_target_length = _young_list_min_length; |
342 | 665 } |
666 } else { | |
667 // we are in a partially-young mode or we've run out of regions (due | |
668 // to evacuation failure) | |
669 | |
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670 #ifdef TRACE_CALC_YOUNG_LENGTH |
342 | 671 // leave this in for debugging, just in case |
672 gclog_or_tty->print_cr("(partial) setting target to " SIZE_FORMAT | |
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673 _young_list_min_length); |
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674 #endif // TRACE_CALC_YOUNG_LENGTH |
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675 // we'll do the pause as soon as possible by choosing the minimum |
1973 | 676 _young_list_target_length = _young_list_min_length; |
342 | 677 } |
678 | |
679 _rs_lengths_prediction = rs_lengths; | |
680 } | |
681 | |
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682 // This is used by: calculate_young_list_target_length(rs_length). It |
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683 // returns true iff: |
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684 // the predicted pause time for the given young list will not overflow |
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685 // the target pause time |
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686 // and: |
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687 // the predicted amount of surviving data will not overflow the |
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688 // the amount of free space available for survivor regions. |
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689 // |
342 | 690 bool |
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691 G1CollectorPolicy::predict_will_fit(size_t young_length, |
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692 double base_time_ms, |
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693 size_t init_free_regions, |
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694 double target_pause_time_ms) { |
342 | 695 |
696 if (young_length >= init_free_regions) | |
697 // end condition 1: not enough space for the young regions | |
698 return false; | |
699 | |
700 double accum_surv_rate_adj = 0.0; | |
701 double accum_surv_rate = | |
702 accum_yg_surv_rate_pred((int)(young_length - 1)) - accum_surv_rate_adj; | |
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703 |
342 | 704 size_t bytes_to_copy = |
705 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); | |
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706 |
342 | 707 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
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708 |
342 | 709 double young_other_time_ms = |
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710 predict_young_other_time_ms(young_length); |
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711 |
342 | 712 double pause_time_ms = |
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713 base_time_ms + copy_time_ms + young_other_time_ms; |
342 | 714 |
715 if (pause_time_ms > target_pause_time_ms) | |
716 // end condition 2: over the target pause time | |
717 return false; | |
718 | |
719 size_t free_bytes = | |
720 (init_free_regions - young_length) * HeapRegion::GrainBytes; | |
721 | |
722 if ((2.0 + sigma()) * (double) bytes_to_copy > (double) free_bytes) | |
723 // end condition 3: out of to-space (conservatively) | |
724 return false; | |
725 | |
726 // success! | |
727 return true; | |
728 } | |
729 | |
545 | 730 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
731 double survivor_regions_evac_time = 0.0; | |
732 for (HeapRegion * r = _recorded_survivor_head; | |
733 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
734 r = r->get_next_young_region()) { | |
735 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); | |
736 } | |
737 return survivor_regions_evac_time; | |
738 } | |
739 | |
342 | 740 void G1CollectorPolicy::check_prediction_validity() { |
741 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); | |
742 | |
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743 size_t rs_lengths = _g1->young_list()->sampled_rs_lengths(); |
342 | 744 if (rs_lengths > _rs_lengths_prediction) { |
745 // add 10% to avoid having to recalculate often | |
746 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
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747 calculate_young_list_target_length(rs_lengths_prediction); |
342 | 748 } |
749 } | |
750 | |
751 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, | |
752 bool is_tlab, | |
753 bool* gc_overhead_limit_was_exceeded) { | |
754 guarantee(false, "Not using this policy feature yet."); | |
755 return NULL; | |
756 } | |
757 | |
758 // This method controls how a collector handles one or more | |
759 // of its generations being fully allocated. | |
760 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
761 bool is_tlab) { | |
762 guarantee(false, "Not using this policy feature yet."); | |
763 return NULL; | |
764 } | |
765 | |
766 | |
767 #ifndef PRODUCT | |
768 bool G1CollectorPolicy::verify_young_ages() { | |
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769 HeapRegion* head = _g1->young_list()->first_region(); |
342 | 770 return |
771 verify_young_ages(head, _short_lived_surv_rate_group); | |
772 // also call verify_young_ages on any additional surv rate groups | |
773 } | |
774 | |
775 bool | |
776 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
777 SurvRateGroup *surv_rate_group) { | |
778 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
779 | |
780 const char* name = surv_rate_group->name(); | |
781 bool ret = true; | |
782 int prev_age = -1; | |
783 | |
784 for (HeapRegion* curr = head; | |
785 curr != NULL; | |
786 curr = curr->get_next_young_region()) { | |
787 SurvRateGroup* group = curr->surv_rate_group(); | |
788 if (group == NULL && !curr->is_survivor()) { | |
789 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
790 ret = false; | |
791 } | |
792 | |
793 if (surv_rate_group == group) { | |
794 int age = curr->age_in_surv_rate_group(); | |
795 | |
796 if (age < 0) { | |
797 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
798 ret = false; | |
799 } | |
800 | |
801 if (age <= prev_age) { | |
802 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
803 "(%d, %d)", name, age, prev_age); | |
804 ret = false; | |
805 } | |
806 prev_age = age; | |
807 } | |
808 } | |
809 | |
810 return ret; | |
811 } | |
812 #endif // PRODUCT | |
813 | |
814 void G1CollectorPolicy::record_full_collection_start() { | |
815 _cur_collection_start_sec = os::elapsedTime(); | |
816 // Release the future to-space so that it is available for compaction into. | |
817 _g1->set_full_collection(); | |
818 } | |
819 | |
820 void G1CollectorPolicy::record_full_collection_end() { | |
821 // Consider this like a collection pause for the purposes of allocation | |
822 // since last pause. | |
823 double end_sec = os::elapsedTime(); | |
824 double full_gc_time_sec = end_sec - _cur_collection_start_sec; | |
825 double full_gc_time_ms = full_gc_time_sec * 1000.0; | |
826 | |
827 _all_full_gc_times_ms->add(full_gc_time_ms); | |
828 | |
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829 update_recent_gc_times(end_sec, full_gc_time_ms); |
342 | 830 |
831 _g1->clear_full_collection(); | |
832 | |
833 // "Nuke" the heuristics that control the fully/partially young GC | |
834 // transitions and make sure we start with fully young GCs after the | |
835 // Full GC. | |
836 set_full_young_gcs(true); | |
837 _last_full_young_gc = false; | |
838 _should_revert_to_full_young_gcs = false; | |
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839 clear_initiate_conc_mark_if_possible(); |
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840 clear_during_initial_mark_pause(); |
342 | 841 _known_garbage_bytes = 0; |
842 _known_garbage_ratio = 0.0; | |
843 _in_marking_window = false; | |
844 _in_marking_window_im = false; | |
845 | |
846 _short_lived_surv_rate_group->start_adding_regions(); | |
847 // also call this on any additional surv rate groups | |
848 | |
545 | 849 record_survivor_regions(0, NULL, NULL); |
850 | |
342 | 851 _prev_region_num_young = _region_num_young; |
852 _prev_region_num_tenured = _region_num_tenured; | |
853 | |
854 _free_regions_at_end_of_collection = _g1->free_regions(); | |
545 | 855 // Reset survivors SurvRateGroup. |
856 _survivor_surv_rate_group->reset(); | |
342 | 857 calculate_young_list_min_length(); |
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858 calculate_young_list_target_length(); |
1973 | 859 } |
342 | 860 |
861 void G1CollectorPolicy::record_before_bytes(size_t bytes) { | |
862 _bytes_in_to_space_before_gc += bytes; | |
863 } | |
864 | |
865 void G1CollectorPolicy::record_after_bytes(size_t bytes) { | |
866 _bytes_in_to_space_after_gc += bytes; | |
867 } | |
868 | |
869 void G1CollectorPolicy::record_stop_world_start() { | |
870 _stop_world_start = os::elapsedTime(); | |
871 } | |
872 | |
873 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, | |
874 size_t start_used) { | |
875 if (PrintGCDetails) { | |
876 gclog_or_tty->stamp(PrintGCTimeStamps); | |
877 gclog_or_tty->print("[GC pause"); | |
878 if (in_young_gc_mode()) | |
879 gclog_or_tty->print(" (%s)", full_young_gcs() ? "young" : "partial"); | |
880 } | |
881 | |
1973 | 882 assert(_g1->used() == _g1->recalculate_used(), |
883 err_msg("sanity, used: "SIZE_FORMAT" recalculate_used: "SIZE_FORMAT, | |
884 _g1->used(), _g1->recalculate_used())); | |
342 | 885 |
886 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
887 _all_stop_world_times_ms->add(s_w_t_ms); | |
888 _stop_world_start = 0.0; | |
889 | |
890 _cur_collection_start_sec = start_time_sec; | |
891 _cur_collection_pause_used_at_start_bytes = start_used; | |
892 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); | |
893 _pending_cards = _g1->pending_card_num(); | |
894 _max_pending_cards = _g1->max_pending_card_num(); | |
895 | |
896 _bytes_in_to_space_before_gc = 0; | |
897 _bytes_in_to_space_after_gc = 0; | |
898 _bytes_in_collection_set_before_gc = 0; | |
899 | |
900 #ifdef DEBUG | |
901 // initialise these to something well known so that we can spot | |
902 // if they are not set properly | |
903 | |
904 for (int i = 0; i < _parallel_gc_threads; ++i) { | |
1611 | 905 _par_last_gc_worker_start_times_ms[i] = -1234.0; |
906 _par_last_ext_root_scan_times_ms[i] = -1234.0; | |
907 _par_last_mark_stack_scan_times_ms[i] = -1234.0; | |
908 _par_last_update_rs_times_ms[i] = -1234.0; | |
909 _par_last_update_rs_processed_buffers[i] = -1234.0; | |
910 _par_last_scan_rs_times_ms[i] = -1234.0; | |
911 _par_last_obj_copy_times_ms[i] = -1234.0; | |
912 _par_last_termination_times_ms[i] = -1234.0; | |
913 _par_last_termination_attempts[i] = -1234.0; | |
914 _par_last_gc_worker_end_times_ms[i] = -1234.0; | |
2430 | 915 _par_last_gc_worker_times_ms[i] = -1234.0; |
342 | 916 } |
917 #endif | |
918 | |
919 for (int i = 0; i < _aux_num; ++i) { | |
920 _cur_aux_times_ms[i] = 0.0; | |
921 _cur_aux_times_set[i] = false; | |
922 } | |
923 | |
924 _satb_drain_time_set = false; | |
925 _last_satb_drain_processed_buffers = -1; | |
926 | |
927 if (in_young_gc_mode()) | |
928 _last_young_gc_full = false; | |
929 | |
930 // do that for any other surv rate groups | |
931 _short_lived_surv_rate_group->stop_adding_regions(); | |
1282 | 932 _survivors_age_table.clear(); |
545 | 933 |
342 | 934 assert( verify_young_ages(), "region age verification" ); |
935 } | |
936 | |
937 void G1CollectorPolicy::record_mark_closure_time(double mark_closure_time_ms) { | |
938 _mark_closure_time_ms = mark_closure_time_ms; | |
939 } | |
940 | |
941 void G1CollectorPolicy::record_concurrent_mark_init_start() { | |
942 _mark_init_start_sec = os::elapsedTime(); | |
943 guarantee(!in_young_gc_mode(), "should not do be here in young GC mode"); | |
944 } | |
945 | |
946 void G1CollectorPolicy::record_concurrent_mark_init_end_pre(double | |
947 mark_init_elapsed_time_ms) { | |
948 _during_marking = true; | |
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949 assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
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950 clear_during_initial_mark_pause(); |
342 | 951 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
952 } | |
953 | |
954 void G1CollectorPolicy::record_concurrent_mark_init_end() { | |
955 double end_time_sec = os::elapsedTime(); | |
956 double elapsed_time_ms = (end_time_sec - _mark_init_start_sec) * 1000.0; | |
957 _concurrent_mark_init_times_ms->add(elapsed_time_ms); | |
958 record_concurrent_mark_init_end_pre(elapsed_time_ms); | |
959 | |
960 _mmu_tracker->add_pause(_mark_init_start_sec, end_time_sec, true); | |
961 } | |
962 | |
963 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
964 _mark_remark_start_sec = os::elapsedTime(); | |
965 _during_marking = false; | |
966 } | |
967 | |
968 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
969 double end_time_sec = os::elapsedTime(); | |
970 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
971 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
972 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
973 _prev_collection_pause_end_ms += elapsed_time_ms; | |
974 | |
975 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
976 } | |
977 | |
978 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
979 _mark_cleanup_start_sec = os::elapsedTime(); | |
980 } | |
981 | |
982 void | |
983 G1CollectorPolicy::record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
984 size_t max_live_bytes) { | |
985 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
986 record_concurrent_mark_cleanup_end_work2(); | |
987 } | |
988 | |
989 void | |
990 G1CollectorPolicy:: | |
991 record_concurrent_mark_cleanup_end_work1(size_t freed_bytes, | |
992 size_t max_live_bytes) { | |
993 if (_n_marks < 2) _n_marks++; | |
994 if (G1PolicyVerbose > 0) | |
995 gclog_or_tty->print_cr("At end of marking, max_live is " SIZE_FORMAT " MB " | |
996 " (of " SIZE_FORMAT " MB heap).", | |
997 max_live_bytes/M, _g1->capacity()/M); | |
998 } | |
999 | |
1000 // The important thing about this is that it includes "os::elapsedTime". | |
1001 void G1CollectorPolicy::record_concurrent_mark_cleanup_end_work2() { | |
1002 double end_time_sec = os::elapsedTime(); | |
1003 double elapsed_time_ms = (end_time_sec - _mark_cleanup_start_sec)*1000.0; | |
1004 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
1005 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
1006 _prev_collection_pause_end_ms += elapsed_time_ms; | |
1007 | |
1008 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_time_sec, true); | |
1009 | |
1010 _num_markings++; | |
1011 | |
1012 // We did a marking, so reset the "since_last_mark" variables. | |
1013 double considerConcMarkCost = 1.0; | |
1014 // If there are available processors, concurrent activity is free... | |
1015 if (Threads::number_of_non_daemon_threads() * 2 < | |
1016 os::active_processor_count()) { | |
1017 considerConcMarkCost = 0.0; | |
1018 } | |
1019 _n_pauses_at_mark_end = _n_pauses; | |
1020 _n_marks_since_last_pause++; | |
1021 } | |
1022 | |
1023 void | |
1024 G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { | |
1025 if (in_young_gc_mode()) { | |
1026 _should_revert_to_full_young_gcs = false; | |
1027 _last_full_young_gc = true; | |
1028 _in_marking_window = false; | |
1029 if (adaptive_young_list_length()) | |
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1030 calculate_young_list_target_length(); |
342 | 1031 } |
1032 } | |
1033 | |
1034 void G1CollectorPolicy::record_concurrent_pause() { | |
1035 if (_stop_world_start > 0.0) { | |
1036 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
1037 _all_yield_times_ms->add(yield_ms); | |
1038 } | |
1039 } | |
1040 | |
1041 void G1CollectorPolicy::record_concurrent_pause_end() { | |
1042 } | |
1043 | |
1044 void G1CollectorPolicy::record_collection_pause_end_CH_strong_roots() { | |
1045 _cur_CH_strong_roots_end_sec = os::elapsedTime(); | |
1046 _cur_CH_strong_roots_dur_ms = | |
1047 (_cur_CH_strong_roots_end_sec - _cur_collection_start_sec) * 1000.0; | |
1048 } | |
1049 | |
1050 void G1CollectorPolicy::record_collection_pause_end_G1_strong_roots() { | |
1051 _cur_G1_strong_roots_end_sec = os::elapsedTime(); | |
1052 _cur_G1_strong_roots_dur_ms = | |
1053 (_cur_G1_strong_roots_end_sec - _cur_CH_strong_roots_end_sec) * 1000.0; | |
1054 } | |
1055 | |
1056 template<class T> | |
1057 T sum_of(T* sum_arr, int start, int n, int N) { | |
1058 T sum = (T)0; | |
1059 for (int i = 0; i < n; i++) { | |
1060 int j = (start + i) % N; | |
1061 sum += sum_arr[j]; | |
1062 } | |
1063 return sum; | |
1064 } | |
1065 | |
1611 | 1066 void G1CollectorPolicy::print_par_stats(int level, |
1067 const char* str, | |
2430 | 1068 double* data) { |
342 | 1069 double min = data[0], max = data[0]; |
1070 double total = 0.0; | |
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1071 LineBuffer buf(level); |
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1072 buf.append("[%s (ms):", str); |
342 | 1073 for (uint i = 0; i < ParallelGCThreads; ++i) { |
1074 double val = data[i]; | |
1075 if (val < min) | |
1076 min = val; | |
1077 if (val > max) | |
1078 max = val; | |
1079 total += val; | |
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1080 buf.append(" %3.1lf", val); |
342 | 1081 } |
2430 | 1082 buf.append_and_print_cr(""); |
1083 double avg = total / (double) ParallelGCThreads; | |
1084 buf.append_and_print_cr(" Avg: %5.1lf, Min: %5.1lf, Max: %5.1lf, Diff: %5.1lf]", | |
1085 avg, min, max, max - min); | |
342 | 1086 } |
1087 | |
1611 | 1088 void G1CollectorPolicy::print_par_sizes(int level, |
1089 const char* str, | |
2430 | 1090 double* data) { |
342 | 1091 double min = data[0], max = data[0]; |
1092 double total = 0.0; | |
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1093 LineBuffer buf(level); |
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1094 buf.append("[%s :", str); |
342 | 1095 for (uint i = 0; i < ParallelGCThreads; ++i) { |
1096 double val = data[i]; | |
1097 if (val < min) | |
1098 min = val; | |
1099 if (val > max) | |
1100 max = val; | |
1101 total += val; | |
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1102 buf.append(" %d", (int) val); |
342 | 1103 } |
2430 | 1104 buf.append_and_print_cr(""); |
1105 double avg = total / (double) ParallelGCThreads; | |
1106 buf.append_and_print_cr(" Sum: %d, Avg: %d, Min: %d, Max: %d, Diff: %d]", | |
1107 (int)total, (int)avg, (int)min, (int)max, (int)max - (int)min); | |
342 | 1108 } |
1109 | |
1110 void G1CollectorPolicy::print_stats (int level, | |
1111 const char* str, | |
1112 double value) { | |
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1113 LineBuffer(level).append_and_print_cr("[%s: %5.1lf ms]", str, value); |
342 | 1114 } |
1115 | |
1116 void G1CollectorPolicy::print_stats (int level, | |
1117 const char* str, | |
1118 int value) { | |
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1119 LineBuffer(level).append_and_print_cr("[%s: %d]", str, value); |
342 | 1120 } |
1121 | |
1122 double G1CollectorPolicy::avg_value (double* data) { | |
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1123 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1124 double ret = 0.0; |
1125 for (uint i = 0; i < ParallelGCThreads; ++i) | |
1126 ret += data[i]; | |
1127 return ret / (double) ParallelGCThreads; | |
1128 } else { | |
1129 return data[0]; | |
1130 } | |
1131 } | |
1132 | |
1133 double G1CollectorPolicy::max_value (double* data) { | |
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1134 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1135 double ret = data[0]; |
1136 for (uint i = 1; i < ParallelGCThreads; ++i) | |
1137 if (data[i] > ret) | |
1138 ret = data[i]; | |
1139 return ret; | |
1140 } else { | |
1141 return data[0]; | |
1142 } | |
1143 } | |
1144 | |
1145 double G1CollectorPolicy::sum_of_values (double* data) { | |
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1146 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1147 double sum = 0.0; |
1148 for (uint i = 0; i < ParallelGCThreads; i++) | |
1149 sum += data[i]; | |
1150 return sum; | |
1151 } else { | |
1152 return data[0]; | |
1153 } | |
1154 } | |
1155 | |
1156 double G1CollectorPolicy::max_sum (double* data1, | |
1157 double* data2) { | |
1158 double ret = data1[0] + data2[0]; | |
1159 | |
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1160 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1161 for (uint i = 1; i < ParallelGCThreads; ++i) { |
1162 double data = data1[i] + data2[i]; | |
1163 if (data > ret) | |
1164 ret = data; | |
1165 } | |
1166 } | |
1167 return ret; | |
1168 } | |
1169 | |
1170 // Anything below that is considered to be zero | |
1171 #define MIN_TIMER_GRANULARITY 0.0000001 | |
1172 | |
1707 | 1173 void G1CollectorPolicy::record_collection_pause_end() { |
342 | 1174 double end_time_sec = os::elapsedTime(); |
1175 double elapsed_ms = _last_pause_time_ms; | |
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1176 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
342 | 1177 double evac_ms = (end_time_sec - _cur_G1_strong_roots_end_sec) * 1000.0; |
1178 size_t rs_size = | |
1179 _cur_collection_pause_used_regions_at_start - collection_set_size(); | |
1180 size_t cur_used_bytes = _g1->used(); | |
1181 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
1182 bool last_pause_included_initial_mark = false; | |
1707 | 1183 bool update_stats = !_g1->evacuation_failed(); |
342 | 1184 |
1185 #ifndef PRODUCT | |
1186 if (G1YoungSurvRateVerbose) { | |
1187 gclog_or_tty->print_cr(""); | |
1188 _short_lived_surv_rate_group->print(); | |
1189 // do that for any other surv rate groups too | |
1190 } | |
1191 #endif // PRODUCT | |
1192 | |
1193 if (in_young_gc_mode()) { | |
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1194 last_pause_included_initial_mark = during_initial_mark_pause(); |
342 | 1195 if (last_pause_included_initial_mark) |
1196 record_concurrent_mark_init_end_pre(0.0); | |
1197 | |
1198 size_t min_used_targ = | |
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1199 (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
342 | 1200 |
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1201 |
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1202 if (!_g1->mark_in_progress() && !_last_full_young_gc) { |
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1203 assert(!last_pause_included_initial_mark, "invariant"); |
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1204 if (cur_used_bytes > min_used_targ && |
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1205 cur_used_bytes > _prev_collection_pause_used_at_end_bytes) { |
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1206 assert(!during_initial_mark_pause(), "we should not see this here"); |
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1207 |
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1208 // Note: this might have already been set, if during the last |
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1209 // pause we decided to start a cycle but at the beginning of |
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1210 // this pause we decided to postpone it. That's OK. |
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1211 set_initiate_conc_mark_if_possible(); |
342 | 1212 } |
1213 } | |
1214 | |
1215 _prev_collection_pause_used_at_end_bytes = cur_used_bytes; | |
1216 } | |
1217 | |
1218 _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0, | |
1219 end_time_sec, false); | |
1220 | |
1221 guarantee(_cur_collection_pause_used_regions_at_start >= | |
1222 collection_set_size(), | |
1223 "Negative RS size?"); | |
1224 | |
1225 // This assert is exempted when we're doing parallel collection pauses, | |
1226 // because the fragmentation caused by the parallel GC allocation buffers | |
1227 // can lead to more memory being used during collection than was used | |
1228 // before. Best leave this out until the fragmentation problem is fixed. | |
1229 // Pauses in which evacuation failed can also lead to negative | |
1230 // collections, since no space is reclaimed from a region containing an | |
1231 // object whose evacuation failed. | |
1232 // Further, we're now always doing parallel collection. But I'm still | |
1233 // leaving this here as a placeholder for a more precise assertion later. | |
1234 // (DLD, 10/05.) | |
1235 assert((true || parallel) // Always using GC LABs now. | |
1236 || _g1->evacuation_failed() | |
1237 || _cur_collection_pause_used_at_start_bytes >= cur_used_bytes, | |
1238 "Negative collection"); | |
1239 | |
1240 size_t freed_bytes = | |
1241 _cur_collection_pause_used_at_start_bytes - cur_used_bytes; | |
1242 size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; | |
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1243 |
342 | 1244 double survival_fraction = |
1245 (double)surviving_bytes/ | |
1246 (double)_collection_set_bytes_used_before; | |
1247 | |
1248 _n_pauses++; | |
1249 | |
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1250 if (update_stats) { |
342 | 1251 _recent_CH_strong_roots_times_ms->add(_cur_CH_strong_roots_dur_ms); |
1252 _recent_G1_strong_roots_times_ms->add(_cur_G1_strong_roots_dur_ms); | |
1253 _recent_evac_times_ms->add(evac_ms); | |
1254 _recent_pause_times_ms->add(elapsed_ms); | |
1255 | |
1256 _recent_rs_sizes->add(rs_size); | |
1257 | |
1258 // We exempt parallel collection from this check because Alloc Buffer | |
1259 // fragmentation can produce negative collections. Same with evac | |
1260 // failure. | |
1261 // Further, we're now always doing parallel collection. But I'm still | |
1262 // leaving this here as a placeholder for a more precise assertion later. | |
1263 // (DLD, 10/05. | |
1264 assert((true || parallel) | |
1265 || _g1->evacuation_failed() | |
1266 || surviving_bytes <= _collection_set_bytes_used_before, | |
1267 "Or else negative collection!"); | |
1268 _recent_CS_bytes_used_before->add(_collection_set_bytes_used_before); | |
1269 _recent_CS_bytes_surviving->add(surviving_bytes); | |
1270 | |
1271 // this is where we update the allocation rate of the application | |
1272 double app_time_ms = | |
1273 (_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms); | |
1274 if (app_time_ms < MIN_TIMER_GRANULARITY) { | |
1275 // This usually happens due to the timer not having the required | |
1276 // granularity. Some Linuxes are the usual culprits. | |
1277 // We'll just set it to something (arbitrarily) small. | |
1278 app_time_ms = 1.0; | |
1279 } | |
1280 size_t regions_allocated = | |
1281 (_region_num_young - _prev_region_num_young) + | |
1282 (_region_num_tenured - _prev_region_num_tenured); | |
1283 double alloc_rate_ms = (double) regions_allocated / app_time_ms; | |
1284 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
1285 _prev_region_num_young = _region_num_young; | |
1286 _prev_region_num_tenured = _region_num_tenured; | |
1287 | |
1288 double interval_ms = | |
1289 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
1290 update_recent_gc_times(end_time_sec, elapsed_ms); | |
1291 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; | |
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1292 if (recent_avg_pause_time_ratio() < 0.0 || |
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1293 (recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
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1294 #ifndef PRODUCT |
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1295 // Dump info to allow post-facto debugging |
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1296 gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
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1297 gclog_or_tty->print_cr("-------------------------------------------"); |
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1298 gclog_or_tty->print_cr("Recent GC Times (ms):"); |
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1299 _recent_gc_times_ms->dump(); |
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1300 gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
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1301 _recent_prev_end_times_for_all_gcs_sec->dump(); |
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1302 gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
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1303 _recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
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1304 // In debug mode, terminate the JVM if the user wants to debug at this point. |
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1305 assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
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1306 #endif // !PRODUCT |
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1307 // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
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1308 // CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
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1309 if (_recent_avg_pause_time_ratio < 0.0) { |
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1310 _recent_avg_pause_time_ratio = 0.0; |
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1311 } else { |
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1312 assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
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|
1313 _recent_avg_pause_time_ratio = 1.0; |
89f1b9ae8991
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
1043
diff
changeset
|
1314 } |
89f1b9ae8991
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
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parents:
1043
diff
changeset
|
1315 } |
342 | 1316 } |
1317 | |
1318 if (G1PolicyVerbose > 1) { | |
1319 gclog_or_tty->print_cr(" Recording collection pause(%d)", _n_pauses); | |
1320 } | |
1321 | |
1707 | 1322 PauseSummary* summary = _summary; |
342 | 1323 |
1324 double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); | |
1325 double mark_stack_scan_time = avg_value(_par_last_mark_stack_scan_times_ms); | |
1326 double update_rs_time = avg_value(_par_last_update_rs_times_ms); | |
1327 double update_rs_processed_buffers = | |
1328 sum_of_values(_par_last_update_rs_processed_buffers); | |
1329 double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); | |
1330 double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); | |
1331 double termination_time = avg_value(_par_last_termination_times_ms); | |
1332 | |
648
2314b7336582
6820321: G1: Error: guarantee(check_nums(total, n, parts), "all seq lengths should match")
tonyp
parents:
640
diff
changeset
|
1333 double parallel_other_time = _cur_collection_par_time_ms - |
2314b7336582
6820321: G1: Error: guarantee(check_nums(total, n, parts), "all seq lengths should match")
tonyp
parents:
640
diff
changeset
|
1334 (update_rs_time + ext_root_scan_time + mark_stack_scan_time + |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1335 scan_rs_time + obj_copy_time + termination_time); |
595
3698e8f47799
6804746: G1: guarantee(variance() > -1.0,"variance should be >= 0") (due to evacuation failure)
tonyp
parents:
547
diff
changeset
|
1336 if (update_stats) { |
342 | 1337 MainBodySummary* body_summary = summary->main_body_summary(); |
1338 guarantee(body_summary != NULL, "should not be null!"); | |
1339 | |
1340 if (_satb_drain_time_set) | |
1341 body_summary->record_satb_drain_time_ms(_cur_satb_drain_time_ms); | |
1342 else | |
1343 body_summary->record_satb_drain_time_ms(0.0); | |
1344 body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); | |
1345 body_summary->record_mark_stack_scan_time_ms(mark_stack_scan_time); | |
1346 body_summary->record_update_rs_time_ms(update_rs_time); | |
1347 body_summary->record_scan_rs_time_ms(scan_rs_time); | |
1348 body_summary->record_obj_copy_time_ms(obj_copy_time); | |
1349 if (parallel) { | |
1350 body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); | |
1351 body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); | |
1352 body_summary->record_termination_time_ms(termination_time); | |
1353 body_summary->record_parallel_other_time_ms(parallel_other_time); | |
1354 } | |
1355 body_summary->record_mark_closure_time_ms(_mark_closure_time_ms); | |
1356 } | |
1357 | |
1358 if (G1PolicyVerbose > 1) { | |
1359 gclog_or_tty->print_cr(" ET: %10.6f ms (avg: %10.6f ms)\n" | |
1360 " CH Strong: %10.6f ms (avg: %10.6f ms)\n" | |
1361 " G1 Strong: %10.6f ms (avg: %10.6f ms)\n" | |
1362 " Evac: %10.6f ms (avg: %10.6f ms)\n" | |
1363 " ET-RS: %10.6f ms (avg: %10.6f ms)\n" | |
1364 " |RS|: " SIZE_FORMAT, | |
1365 elapsed_ms, recent_avg_time_for_pauses_ms(), | |
1366 _cur_CH_strong_roots_dur_ms, recent_avg_time_for_CH_strong_ms(), | |
1367 _cur_G1_strong_roots_dur_ms, recent_avg_time_for_G1_strong_ms(), | |
1368 evac_ms, recent_avg_time_for_evac_ms(), | |
1369 scan_rs_time, | |
1370 recent_avg_time_for_pauses_ms() - | |
1371 recent_avg_time_for_G1_strong_ms(), | |
1372 rs_size); | |
1373 | |
1374 gclog_or_tty->print_cr(" Used at start: " SIZE_FORMAT"K" | |
1375 " At end " SIZE_FORMAT "K\n" | |
1376 " garbage : " SIZE_FORMAT "K" | |
1377 " of " SIZE_FORMAT "K\n" | |
1378 " survival : %6.2f%% (%6.2f%% avg)", | |
1379 _cur_collection_pause_used_at_start_bytes/K, | |
1380 _g1->used()/K, freed_bytes/K, | |
1381 _collection_set_bytes_used_before/K, | |
1382 survival_fraction*100.0, | |
1383 recent_avg_survival_fraction()*100.0); | |
1384 gclog_or_tty->print_cr(" Recent %% gc pause time: %6.2f", | |
1385 recent_avg_pause_time_ratio() * 100.0); | |
1386 } | |
1387 | |
1388 double other_time_ms = elapsed_ms; | |
1389 | |
1707 | 1390 if (_satb_drain_time_set) { |
1391 other_time_ms -= _cur_satb_drain_time_ms; | |
1392 } | |
1393 | |
1394 if (parallel) { | |
1395 other_time_ms -= _cur_collection_par_time_ms + _cur_clear_ct_time_ms; | |
1396 } else { | |
1397 other_time_ms -= | |
1398 update_rs_time + | |
1399 ext_root_scan_time + mark_stack_scan_time + | |
1400 scan_rs_time + obj_copy_time; | |
342 | 1401 } |
1402 | |
1403 if (PrintGCDetails) { | |
1707 | 1404 gclog_or_tty->print_cr("%s, %1.8lf secs]", |
342 | 1405 (last_pause_included_initial_mark) ? " (initial-mark)" : "", |
1406 elapsed_ms / 1000.0); | |
1407 | |
1707 | 1408 if (_satb_drain_time_set) { |
1409 print_stats(1, "SATB Drain Time", _cur_satb_drain_time_ms); | |
1410 } | |
1411 if (_last_satb_drain_processed_buffers >= 0) { | |
1412 print_stats(2, "Processed Buffers", _last_satb_drain_processed_buffers); | |
1413 } | |
1414 if (parallel) { | |
1415 print_stats(1, "Parallel Time", _cur_collection_par_time_ms); | |
2430 | 1416 print_par_stats(2, "GC Worker Start Time", _par_last_gc_worker_start_times_ms); |
1707 | 1417 print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); |
2430 | 1418 print_par_sizes(3, "Processed Buffers", _par_last_update_rs_processed_buffers); |
1419 print_par_stats(2, "Ext Root Scanning", _par_last_ext_root_scan_times_ms); | |
1420 print_par_stats(2, "Mark Stack Scanning", _par_last_mark_stack_scan_times_ms); | |
1707 | 1421 print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms); |
1422 print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms); | |
1423 print_par_stats(2, "Termination", _par_last_termination_times_ms); | |
2430 | 1424 print_par_sizes(3, "Termination Attempts", _par_last_termination_attempts); |
1425 print_par_stats(2, "GC Worker End Time", _par_last_gc_worker_end_times_ms); | |
1426 | |
1427 for (int i = 0; i < _parallel_gc_threads; i++) { | |
1428 _par_last_gc_worker_times_ms[i] = _par_last_gc_worker_end_times_ms[i] - _par_last_gc_worker_start_times_ms[i]; | |
1429 } | |
1430 print_par_stats(2, "GC Worker Times", _par_last_gc_worker_times_ms); | |
1431 | |
1707 | 1432 print_stats(2, "Other", parallel_other_time); |
1433 print_stats(1, "Clear CT", _cur_clear_ct_time_ms); | |
1434 } else { | |
1435 print_stats(1, "Update RS", update_rs_time); | |
1436 print_stats(2, "Processed Buffers", | |
1437 (int)update_rs_processed_buffers); | |
1438 print_stats(1, "Ext Root Scanning", ext_root_scan_time); | |
1439 print_stats(1, "Mark Stack Scanning", mark_stack_scan_time); | |
1440 print_stats(1, "Scan RS", scan_rs_time); | |
1441 print_stats(1, "Object Copying", obj_copy_time); | |
342 | 1442 } |
890
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
changeset
|
1443 #ifndef PRODUCT |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
changeset
|
1444 print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms); |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
changeset
|
1445 print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms); |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
changeset
|
1446 print_stats(1, "Min Clear CC", _min_clear_cc_time_ms); |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
changeset
|
1447 print_stats(1, "Max Clear CC", _max_clear_cc_time_ms); |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
changeset
|
1448 if (_num_cc_clears > 0) { |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
changeset
|
1449 print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears)); |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
changeset
|
1450 } |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
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|
1451 #endif |
342 | 1452 print_stats(1, "Other", other_time_ms); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1453 print_stats(2, "Choose CSet", _recorded_young_cset_choice_time_ms); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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1391
diff
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|
1454 |
342 | 1455 for (int i = 0; i < _aux_num; ++i) { |
1456 if (_cur_aux_times_set[i]) { | |
1457 char buffer[96]; | |
1458 sprintf(buffer, "Aux%d", i); | |
1459 print_stats(1, buffer, _cur_aux_times_ms[i]); | |
1460 } | |
1461 } | |
1462 } | |
1463 if (PrintGCDetails) | |
1464 gclog_or_tty->print(" ["); | |
1465 if (PrintGC || PrintGCDetails) | |
1466 _g1->print_size_transition(gclog_or_tty, | |
1467 _cur_collection_pause_used_at_start_bytes, | |
1468 _g1->used(), _g1->capacity()); | |
1469 if (PrintGCDetails) | |
1470 gclog_or_tty->print_cr("]"); | |
1471 | |
1472 _all_pause_times_ms->add(elapsed_ms); | |
648
2314b7336582
6820321: G1: Error: guarantee(check_nums(total, n, parts), "all seq lengths should match")
tonyp
parents:
640
diff
changeset
|
1473 if (update_stats) { |
2314b7336582
6820321: G1: Error: guarantee(check_nums(total, n, parts), "all seq lengths should match")
tonyp
parents:
640
diff
changeset
|
1474 summary->record_total_time_ms(elapsed_ms); |
2314b7336582
6820321: G1: Error: guarantee(check_nums(total, n, parts), "all seq lengths should match")
tonyp
parents:
640
diff
changeset
|
1475 summary->record_other_time_ms(other_time_ms); |
2314b7336582
6820321: G1: Error: guarantee(check_nums(total, n, parts), "all seq lengths should match")
tonyp
parents:
640
diff
changeset
|
1476 } |
342 | 1477 for (int i = 0; i < _aux_num; ++i) |
1478 if (_cur_aux_times_set[i]) | |
1479 _all_aux_times_ms[i].add(_cur_aux_times_ms[i]); | |
1480 | |
1481 // Reset marks-between-pauses counter. | |
1482 _n_marks_since_last_pause = 0; | |
1483 | |
1484 // Update the efficiency-since-mark vars. | |
1485 double proc_ms = elapsed_ms * (double) _parallel_gc_threads; | |
1486 if (elapsed_ms < MIN_TIMER_GRANULARITY) { | |
1487 // This usually happens due to the timer not having the required | |
1488 // granularity. Some Linuxes are the usual culprits. | |
1489 // We'll just set it to something (arbitrarily) small. | |
1490 proc_ms = 1.0; | |
1491 } | |
1492 double cur_efficiency = (double) freed_bytes / proc_ms; | |
1493 | |
1494 bool new_in_marking_window = _in_marking_window; | |
1495 bool new_in_marking_window_im = false; | |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
changeset
|
1496 if (during_initial_mark_pause()) { |
342 | 1497 new_in_marking_window = true; |
1498 new_in_marking_window_im = true; | |
1499 } | |
1500 | |
1501 if (in_young_gc_mode()) { | |
1502 if (_last_full_young_gc) { | |
1503 set_full_young_gcs(false); | |
1504 _last_full_young_gc = false; | |
1505 } | |
1506 | |
1507 if ( !_last_young_gc_full ) { | |
1508 if ( _should_revert_to_full_young_gcs || | |
1509 _known_garbage_ratio < 0.05 || | |
1510 (adaptive_young_list_length() && | |
1511 (get_gc_eff_factor() * cur_efficiency < predict_young_gc_eff())) ) { | |
1512 set_full_young_gcs(true); | |
1513 } | |
1514 } | |
1515 _should_revert_to_full_young_gcs = false; | |
1516 | |
1517 if (_last_young_gc_full && !_during_marking) | |
1518 _young_gc_eff_seq->add(cur_efficiency); | |
1519 } | |
1520 | |
1521 _short_lived_surv_rate_group->start_adding_regions(); | |
1522 // do that for any other surv rate groupsx | |
1523 | |
1524 // <NEW PREDICTION> | |
1525 | |
677 | 1526 if (update_stats) { |
342 | 1527 double pause_time_ms = elapsed_ms; |
1528 | |
1529 size_t diff = 0; | |
1530 if (_max_pending_cards >= _pending_cards) | |
1531 diff = _max_pending_cards - _pending_cards; | |
1532 _pending_card_diff_seq->add((double) diff); | |
1533 | |
1534 double cost_per_card_ms = 0.0; | |
1535 if (_pending_cards > 0) { | |
1536 cost_per_card_ms = update_rs_time / (double) _pending_cards; | |
1537 _cost_per_card_ms_seq->add(cost_per_card_ms); | |
1538 } | |
1539 | |
1540 size_t cards_scanned = _g1->cards_scanned(); | |
1541 | |
1542 double cost_per_entry_ms = 0.0; | |
1543 if (cards_scanned > 10) { | |
1544 cost_per_entry_ms = scan_rs_time / (double) cards_scanned; | |
1545 if (_last_young_gc_full) | |
1546 _cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1547 else | |
1548 _partially_young_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1549 } | |
1550 | |
1551 if (_max_rs_lengths > 0) { | |
1552 double cards_per_entry_ratio = | |
1553 (double) cards_scanned / (double) _max_rs_lengths; | |
1554 if (_last_young_gc_full) | |
1555 _fully_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1556 else | |
1557 _partially_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1558 } | |
1559 | |
1560 size_t rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; | |
1561 if (rs_length_diff >= 0) | |
1562 _rs_length_diff_seq->add((double) rs_length_diff); | |
1563 | |
1564 size_t copied_bytes = surviving_bytes; | |
1565 double cost_per_byte_ms = 0.0; | |
1566 if (copied_bytes > 0) { | |
1567 cost_per_byte_ms = obj_copy_time / (double) copied_bytes; | |
1568 if (_in_marking_window) | |
1569 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); | |
1570 else | |
1571 _cost_per_byte_ms_seq->add(cost_per_byte_ms); | |
1572 } | |
1573 | |
1574 double all_other_time_ms = pause_time_ms - | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
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|
1575 (update_rs_time + scan_rs_time + obj_copy_time + |
342 | 1576 _mark_closure_time_ms + termination_time); |
1577 | |
1578 double young_other_time_ms = 0.0; | |
1579 if (_recorded_young_regions > 0) { | |
1580 young_other_time_ms = | |
1581 _recorded_young_cset_choice_time_ms + | |
1582 _recorded_young_free_cset_time_ms; | |
1583 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / | |
1584 (double) _recorded_young_regions); | |
1585 } | |
1586 double non_young_other_time_ms = 0.0; | |
1587 if (_recorded_non_young_regions > 0) { | |
1588 non_young_other_time_ms = | |
1589 _recorded_non_young_cset_choice_time_ms + | |
1590 _recorded_non_young_free_cset_time_ms; | |
1591 | |
1592 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
1593 (double) _recorded_non_young_regions); | |
1594 } | |
1595 | |
1596 double constant_other_time_ms = all_other_time_ms - | |
1597 (young_other_time_ms + non_young_other_time_ms); | |
1598 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
1599 | |
1600 double survival_ratio = 0.0; | |
1601 if (_bytes_in_collection_set_before_gc > 0) { | |
1602 survival_ratio = (double) bytes_in_to_space_during_gc() / | |
1603 (double) _bytes_in_collection_set_before_gc; | |
1604 } | |
1605 | |
1606 _pending_cards_seq->add((double) _pending_cards); | |
1607 _scanned_cards_seq->add((double) cards_scanned); | |
1608 _rs_lengths_seq->add((double) _max_rs_lengths); | |
1609 | |
1610 double expensive_region_limit_ms = | |
751 | 1611 (double) MaxGCPauseMillis - predict_constant_other_time_ms(); |
342 | 1612 if (expensive_region_limit_ms < 0.0) { |
1613 // this means that the other time was predicted to be longer than | |
1614 // than the max pause time | |
751 | 1615 expensive_region_limit_ms = (double) MaxGCPauseMillis; |
342 | 1616 } |
1617 _expensive_region_limit_ms = expensive_region_limit_ms; | |
1618 | |
1619 if (PREDICTIONS_VERBOSE) { | |
1620 gclog_or_tty->print_cr(""); | |
1621 gclog_or_tty->print_cr("PREDICTIONS %1.4lf %d " | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
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|
1622 "REGIONS %d %d %d " |
342 | 1623 "PENDING_CARDS %d %d " |
1624 "CARDS_SCANNED %d %d " | |
1625 "RS_LENGTHS %d %d " | |
1626 "RS_UPDATE %1.6lf %1.6lf RS_SCAN %1.6lf %1.6lf " | |
1627 "SURVIVAL_RATIO %1.6lf %1.6lf " | |
1628 "OBJECT_COPY %1.6lf %1.6lf OTHER_CONSTANT %1.6lf %1.6lf " | |
1629 "OTHER_YOUNG %1.6lf %1.6lf " | |
1630 "OTHER_NON_YOUNG %1.6lf %1.6lf " | |
1631 "VTIME_DIFF %1.6lf TERMINATION %1.6lf " | |
1632 "ELAPSED %1.6lf %1.6lf ", | |
1633 _cur_collection_start_sec, | |
1634 (!_last_young_gc_full) ? 2 : | |
1635 (last_pause_included_initial_mark) ? 1 : 0, | |
1636 _recorded_region_num, | |
1637 _recorded_young_regions, | |
1638 _recorded_non_young_regions, | |
1639 _predicted_pending_cards, _pending_cards, | |
1640 _predicted_cards_scanned, cards_scanned, | |
1641 _predicted_rs_lengths, _max_rs_lengths, | |
1642 _predicted_rs_update_time_ms, update_rs_time, | |
1643 _predicted_rs_scan_time_ms, scan_rs_time, | |
1644 _predicted_survival_ratio, survival_ratio, | |
1645 _predicted_object_copy_time_ms, obj_copy_time, | |
1646 _predicted_constant_other_time_ms, constant_other_time_ms, | |
1647 _predicted_young_other_time_ms, young_other_time_ms, | |
1648 _predicted_non_young_other_time_ms, | |
1649 non_young_other_time_ms, | |
1650 _vtime_diff_ms, termination_time, | |
1651 _predicted_pause_time_ms, elapsed_ms); | |
1652 } | |
1653 | |
1654 if (G1PolicyVerbose > 0) { | |
1655 gclog_or_tty->print_cr("Pause Time, predicted: %1.4lfms (predicted %s), actual: %1.4lfms", | |
1656 _predicted_pause_time_ms, | |
1657 (_within_target) ? "within" : "outside", | |
1658 elapsed_ms); | |
1659 } | |
1660 | |
1661 } | |
1662 | |
1663 _in_marking_window = new_in_marking_window; | |
1664 _in_marking_window_im = new_in_marking_window_im; | |
1665 _free_regions_at_end_of_collection = _g1->free_regions(); | |
1666 calculate_young_list_min_length(); | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1667 calculate_young_list_target_length(); |
342 | 1668 |
1111 | 1669 // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
1282 | 1670 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
1111 | 1671 adjust_concurrent_refinement(update_rs_time, update_rs_processed_buffers, update_rs_time_goal_ms); |
342 | 1672 // </NEW PREDICTION> |
1673 } | |
1674 | |
1675 // <NEW PREDICTION> | |
1676 | |
1111 | 1677 void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
1678 double update_rs_processed_buffers, | |
1679 double goal_ms) { | |
1680 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
1681 ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); | |
1682 | |
1282 | 1683 if (G1UseAdaptiveConcRefinement) { |
1111 | 1684 const int k_gy = 3, k_gr = 6; |
1685 const double inc_k = 1.1, dec_k = 0.9; | |
1686 | |
1687 int g = cg1r->green_zone(); | |
1688 if (update_rs_time > goal_ms) { | |
1689 g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. | |
1690 } else { | |
1691 if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { | |
1692 g = (int)MAX2(g * inc_k, g + 1.0); | |
1693 } | |
1694 } | |
1695 // Change the refinement threads params | |
1696 cg1r->set_green_zone(g); | |
1697 cg1r->set_yellow_zone(g * k_gy); | |
1698 cg1r->set_red_zone(g * k_gr); | |
1699 cg1r->reinitialize_threads(); | |
1700 | |
1701 int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); | |
1702 int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, | |
1703 cg1r->yellow_zone()); | |
1704 // Change the barrier params | |
1705 dcqs.set_process_completed_threshold(processing_threshold); | |
1706 dcqs.set_max_completed_queue(cg1r->red_zone()); | |
1707 } | |
1708 | |
1709 int curr_queue_size = dcqs.completed_buffers_num(); | |
1710 if (curr_queue_size >= cg1r->yellow_zone()) { | |
1711 dcqs.set_completed_queue_padding(curr_queue_size); | |
1712 } else { | |
1713 dcqs.set_completed_queue_padding(0); | |
1714 } | |
1715 dcqs.notify_if_necessary(); | |
1716 } | |
1717 | |
342 | 1718 double |
1719 G1CollectorPolicy:: | |
1720 predict_young_collection_elapsed_time_ms(size_t adjustment) { | |
1721 guarantee( adjustment == 0 || adjustment == 1, "invariant" ); | |
1722 | |
1723 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
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1724 size_t young_num = g1h->young_list()->length(); |
342 | 1725 if (young_num == 0) |
1726 return 0.0; | |
1727 | |
1728 young_num += adjustment; | |
1729 size_t pending_cards = predict_pending_cards(); | |
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1730 size_t rs_lengths = g1h->young_list()->sampled_rs_lengths() + |
342 | 1731 predict_rs_length_diff(); |
1732 size_t card_num; | |
1733 if (full_young_gcs()) | |
1734 card_num = predict_young_card_num(rs_lengths); | |
1735 else | |
1736 card_num = predict_non_young_card_num(rs_lengths); | |
1737 size_t young_byte_size = young_num * HeapRegion::GrainBytes; | |
1738 double accum_yg_surv_rate = | |
1739 _short_lived_surv_rate_group->accum_surv_rate(adjustment); | |
1740 | |
1741 size_t bytes_to_copy = | |
1742 (size_t) (accum_yg_surv_rate * (double) HeapRegion::GrainBytes); | |
1743 | |
1744 return | |
1745 predict_rs_update_time_ms(pending_cards) + | |
1746 predict_rs_scan_time_ms(card_num) + | |
1747 predict_object_copy_time_ms(bytes_to_copy) + | |
1748 predict_young_other_time_ms(young_num) + | |
1749 predict_constant_other_time_ms(); | |
1750 } | |
1751 | |
1752 double | |
1753 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { | |
1754 size_t rs_length = predict_rs_length_diff(); | |
1755 size_t card_num; | |
1756 if (full_young_gcs()) | |
1757 card_num = predict_young_card_num(rs_length); | |
1758 else | |
1759 card_num = predict_non_young_card_num(rs_length); | |
1760 return predict_base_elapsed_time_ms(pending_cards, card_num); | |
1761 } | |
1762 | |
1763 double | |
1764 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
1765 size_t scanned_cards) { | |
1766 return | |
1767 predict_rs_update_time_ms(pending_cards) + | |
1768 predict_rs_scan_time_ms(scanned_cards) + | |
1769 predict_constant_other_time_ms(); | |
1770 } | |
1771 | |
1772 double | |
1773 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
1774 bool young) { | |
1775 size_t rs_length = hr->rem_set()->occupied(); | |
1776 size_t card_num; | |
1777 if (full_young_gcs()) | |
1778 card_num = predict_young_card_num(rs_length); | |
1779 else | |
1780 card_num = predict_non_young_card_num(rs_length); | |
1781 size_t bytes_to_copy = predict_bytes_to_copy(hr); | |
1782 | |
1783 double region_elapsed_time_ms = | |
1784 predict_rs_scan_time_ms(card_num) + | |
1785 predict_object_copy_time_ms(bytes_to_copy); | |
1786 | |
1787 if (young) | |
1788 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
1789 else | |
1790 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
1791 | |
1792 return region_elapsed_time_ms; | |
1793 } | |
1794 | |
1795 size_t | |
1796 G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { | |
1797 size_t bytes_to_copy; | |
1798 if (hr->is_marked()) | |
1799 bytes_to_copy = hr->max_live_bytes(); | |
1800 else { | |
1801 guarantee( hr->is_young() && hr->age_in_surv_rate_group() != -1, | |
1802 "invariant" ); | |
1803 int age = hr->age_in_surv_rate_group(); | |
545 | 1804 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
342 | 1805 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
1806 } | |
1807 | |
1808 return bytes_to_copy; | |
1809 } | |
1810 | |
1811 void | |
1812 G1CollectorPolicy::start_recording_regions() { | |
1813 _recorded_rs_lengths = 0; | |
1814 _recorded_young_regions = 0; | |
1815 _recorded_non_young_regions = 0; | |
1816 | |
1817 #if PREDICTIONS_VERBOSE | |
1818 _recorded_marked_bytes = 0; | |
1819 _recorded_young_bytes = 0; | |
1820 _predicted_bytes_to_copy = 0; | |
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1821 _predicted_rs_lengths = 0; |
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1822 _predicted_cards_scanned = 0; |
342 | 1823 #endif // PREDICTIONS_VERBOSE |
1824 } | |
1825 | |
1826 void | |
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1827 G1CollectorPolicy::record_cset_region_info(HeapRegion* hr, bool young) { |
342 | 1828 #if PREDICTIONS_VERBOSE |
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1829 if (!young) { |
342 | 1830 _recorded_marked_bytes += hr->max_live_bytes(); |
1831 } | |
1832 _predicted_bytes_to_copy += predict_bytes_to_copy(hr); | |
1833 #endif // PREDICTIONS_VERBOSE | |
1834 | |
1835 size_t rs_length = hr->rem_set()->occupied(); | |
1836 _recorded_rs_lengths += rs_length; | |
1837 } | |
1838 | |
1839 void | |
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1840 G1CollectorPolicy::record_non_young_cset_region(HeapRegion* hr) { |
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1841 assert(!hr->is_young(), "should not call this"); |
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1842 ++_recorded_non_young_regions; |
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1843 record_cset_region_info(hr, false); |
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1844 } |
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1845 |
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1846 void |
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1847 G1CollectorPolicy::set_recorded_young_regions(size_t n_regions) { |
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1848 _recorded_young_regions = n_regions; |
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1849 } |
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1850 |
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1851 void G1CollectorPolicy::set_recorded_young_bytes(size_t bytes) { |
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1852 #if PREDICTIONS_VERBOSE |
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1853 _recorded_young_bytes = bytes; |
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1854 #endif // PREDICTIONS_VERBOSE |
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1855 } |
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1856 |
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1857 void G1CollectorPolicy::set_recorded_rs_lengths(size_t rs_lengths) { |
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1858 _recorded_rs_lengths = rs_lengths; |
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1859 } |
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1860 |
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1861 void G1CollectorPolicy::set_predicted_bytes_to_copy(size_t bytes) { |
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1862 _predicted_bytes_to_copy = bytes; |
342 | 1863 } |
1864 | |
1865 void | |
1866 G1CollectorPolicy::end_recording_regions() { | |
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1867 // The _predicted_pause_time_ms field is referenced in code |
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1868 // not under PREDICTIONS_VERBOSE. Let's initialize it. |
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1869 _predicted_pause_time_ms = -1.0; |
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1870 |
342 | 1871 #if PREDICTIONS_VERBOSE |
1872 _predicted_pending_cards = predict_pending_cards(); | |
1873 _predicted_rs_lengths = _recorded_rs_lengths + predict_rs_length_diff(); | |
1874 if (full_young_gcs()) | |
1875 _predicted_cards_scanned += predict_young_card_num(_predicted_rs_lengths); | |
1876 else | |
1877 _predicted_cards_scanned += | |
1878 predict_non_young_card_num(_predicted_rs_lengths); | |
1879 _recorded_region_num = _recorded_young_regions + _recorded_non_young_regions; | |
1880 | |
1881 _predicted_rs_update_time_ms = | |
1882 predict_rs_update_time_ms(_g1->pending_card_num()); | |
1883 _predicted_rs_scan_time_ms = | |
1884 predict_rs_scan_time_ms(_predicted_cards_scanned); | |
1885 _predicted_object_copy_time_ms = | |
1886 predict_object_copy_time_ms(_predicted_bytes_to_copy); | |
1887 _predicted_constant_other_time_ms = | |
1888 predict_constant_other_time_ms(); | |
1889 _predicted_young_other_time_ms = | |
1890 predict_young_other_time_ms(_recorded_young_regions); | |
1891 _predicted_non_young_other_time_ms = | |
1892 predict_non_young_other_time_ms(_recorded_non_young_regions); | |
1893 | |
1894 _predicted_pause_time_ms = | |
1895 _predicted_rs_update_time_ms + | |
1896 _predicted_rs_scan_time_ms + | |
1897 _predicted_object_copy_time_ms + | |
1898 _predicted_constant_other_time_ms + | |
1899 _predicted_young_other_time_ms + | |
1900 _predicted_non_young_other_time_ms; | |
1901 #endif // PREDICTIONS_VERBOSE | |
1902 } | |
1903 | |
1904 void G1CollectorPolicy::check_if_region_is_too_expensive(double | |
1905 predicted_time_ms) { | |
1906 // I don't think we need to do this when in young GC mode since | |
1907 // marking will be initiated next time we hit the soft limit anyway... | |
1908 if (predicted_time_ms > _expensive_region_limit_ms) { | |
1909 if (!in_young_gc_mode()) { | |
1910 set_full_young_gcs(true); | |
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1911 // We might want to do something different here. However, |
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1912 // right now we don't support the non-generational G1 mode |
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1913 // (and in fact we are planning to remove the associated code, |
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1914 // see CR 6814390). So, let's leave it as is and this will be |
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1915 // removed some time in the future |
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1916 ShouldNotReachHere(); |
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1917 set_during_initial_mark_pause(); |
342 | 1918 } else |
1919 // no point in doing another partial one | |
1920 _should_revert_to_full_young_gcs = true; | |
1921 } | |
1922 } | |
1923 | |
1924 // </NEW PREDICTION> | |
1925 | |
1926 | |
1927 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, | |
1928 double elapsed_ms) { | |
1929 _recent_gc_times_ms->add(elapsed_ms); | |
1930 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
1931 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
1932 } | |
1933 | |
1934 double G1CollectorPolicy::recent_avg_time_for_pauses_ms() { | |
751 | 1935 if (_recent_pause_times_ms->num() == 0) return (double) MaxGCPauseMillis; |
342 | 1936 else return _recent_pause_times_ms->avg(); |
1937 } | |
1938 | |
1939 double G1CollectorPolicy::recent_avg_time_for_CH_strong_ms() { | |
1940 if (_recent_CH_strong_roots_times_ms->num() == 0) | |
751 | 1941 return (double)MaxGCPauseMillis/3.0; |
342 | 1942 else return _recent_CH_strong_roots_times_ms->avg(); |
1943 } | |
1944 | |
1945 double G1CollectorPolicy::recent_avg_time_for_G1_strong_ms() { | |
1946 if (_recent_G1_strong_roots_times_ms->num() == 0) | |
751 | 1947 return (double)MaxGCPauseMillis/3.0; |
342 | 1948 else return _recent_G1_strong_roots_times_ms->avg(); |
1949 } | |
1950 | |
1951 double G1CollectorPolicy::recent_avg_time_for_evac_ms() { | |
751 | 1952 if (_recent_evac_times_ms->num() == 0) return (double)MaxGCPauseMillis/3.0; |
342 | 1953 else return _recent_evac_times_ms->avg(); |
1954 } | |
1955 | |
1956 int G1CollectorPolicy::number_of_recent_gcs() { | |
1957 assert(_recent_CH_strong_roots_times_ms->num() == | |
1958 _recent_G1_strong_roots_times_ms->num(), "Sequence out of sync"); | |
1959 assert(_recent_G1_strong_roots_times_ms->num() == | |
1960 _recent_evac_times_ms->num(), "Sequence out of sync"); | |
1961 assert(_recent_evac_times_ms->num() == | |
1962 _recent_pause_times_ms->num(), "Sequence out of sync"); | |
1963 assert(_recent_pause_times_ms->num() == | |
1964 _recent_CS_bytes_used_before->num(), "Sequence out of sync"); | |
1965 assert(_recent_CS_bytes_used_before->num() == | |
1966 _recent_CS_bytes_surviving->num(), "Sequence out of sync"); | |
1967 return _recent_pause_times_ms->num(); | |
1968 } | |
1969 | |
1970 double G1CollectorPolicy::recent_avg_survival_fraction() { | |
1971 return recent_avg_survival_fraction_work(_recent_CS_bytes_surviving, | |
1972 _recent_CS_bytes_used_before); | |
1973 } | |
1974 | |
1975 double G1CollectorPolicy::last_survival_fraction() { | |
1976 return last_survival_fraction_work(_recent_CS_bytes_surviving, | |
1977 _recent_CS_bytes_used_before); | |
1978 } | |
1979 | |
1980 double | |
1981 G1CollectorPolicy::recent_avg_survival_fraction_work(TruncatedSeq* surviving, | |
1982 TruncatedSeq* before) { | |
1983 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
1984 if (before->sum() > 0.0) { | |
1985 double recent_survival_rate = surviving->sum() / before->sum(); | |
1986 // We exempt parallel collection from this check because Alloc Buffer | |
1987 // fragmentation can produce negative collections. | |
1988 // Further, we're now always doing parallel collection. But I'm still | |
1989 // leaving this here as a placeholder for a more precise assertion later. | |
1990 // (DLD, 10/05.) | |
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1991 assert((true || G1CollectedHeap::use_parallel_gc_threads()) || |
342 | 1992 _g1->evacuation_failed() || |
1993 recent_survival_rate <= 1.0, "Or bad frac"); | |
1994 return recent_survival_rate; | |
1995 } else { | |
1996 return 1.0; // Be conservative. | |
1997 } | |
1998 } | |
1999 | |
2000 double | |
2001 G1CollectorPolicy::last_survival_fraction_work(TruncatedSeq* surviving, | |
2002 TruncatedSeq* before) { | |
2003 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
2004 if (surviving->num() > 0 && before->last() > 0.0) { | |
2005 double last_survival_rate = surviving->last() / before->last(); | |
2006 // We exempt parallel collection from this check because Alloc Buffer | |
2007 // fragmentation can produce negative collections. | |
2008 // Further, we're now always doing parallel collection. But I'm still | |
2009 // leaving this here as a placeholder for a more precise assertion later. | |
2010 // (DLD, 10/05.) | |
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2011 assert((true || G1CollectedHeap::use_parallel_gc_threads()) || |
342 | 2012 last_survival_rate <= 1.0, "Or bad frac"); |
2013 return last_survival_rate; | |
2014 } else { | |
2015 return 1.0; | |
2016 } | |
2017 } | |
2018 | |
2019 static const int survival_min_obs = 5; | |
2020 static double survival_min_obs_limits[] = { 0.9, 0.7, 0.5, 0.3, 0.1 }; | |
2021 static const double min_survival_rate = 0.1; | |
2022 | |
2023 double | |
2024 G1CollectorPolicy::conservative_avg_survival_fraction_work(double avg, | |
2025 double latest) { | |
2026 double res = avg; | |
2027 if (number_of_recent_gcs() < survival_min_obs) { | |
2028 res = MAX2(res, survival_min_obs_limits[number_of_recent_gcs()]); | |
2029 } | |
2030 res = MAX2(res, latest); | |
2031 res = MAX2(res, min_survival_rate); | |
2032 // In the parallel case, LAB fragmentation can produce "negative | |
2033 // collections"; so can evac failure. Cap at 1.0 | |
2034 res = MIN2(res, 1.0); | |
2035 return res; | |
2036 } | |
2037 | |
2038 size_t G1CollectorPolicy::expansion_amount() { | |
1356 | 2039 if ((recent_avg_pause_time_ratio() * 100.0) > _gc_overhead_perc) { |
751 | 2040 // We will double the existing space, or take |
2041 // G1ExpandByPercentOfAvailable % of the available expansion | |
2042 // space, whichever is smaller, bounded below by a minimum | |
2043 // expansion (unless that's all that's left.) | |
342 | 2044 const size_t min_expand_bytes = 1*M; |
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2045 size_t reserved_bytes = _g1->max_capacity(); |
342 | 2046 size_t committed_bytes = _g1->capacity(); |
2047 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
2048 size_t expand_bytes; | |
2049 size_t expand_bytes_via_pct = | |
751 | 2050 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
342 | 2051 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
2052 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
2053 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
2054 if (G1PolicyVerbose > 1) { | |
2055 gclog_or_tty->print("Decided to expand: ratio = %5.2f, " | |
2056 "committed = %d%s, uncommited = %d%s, via pct = %d%s.\n" | |
2057 " Answer = %d.\n", | |
2058 recent_avg_pause_time_ratio(), | |
2059 byte_size_in_proper_unit(committed_bytes), | |
2060 proper_unit_for_byte_size(committed_bytes), | |
2061 byte_size_in_proper_unit(uncommitted_bytes), | |
2062 proper_unit_for_byte_size(uncommitted_bytes), | |
2063 byte_size_in_proper_unit(expand_bytes_via_pct), | |
2064 proper_unit_for_byte_size(expand_bytes_via_pct), | |
2065 byte_size_in_proper_unit(expand_bytes), | |
2066 proper_unit_for_byte_size(expand_bytes)); | |
2067 } | |
2068 return expand_bytes; | |
2069 } else { | |
2070 return 0; | |
2071 } | |
2072 } | |
2073 | |
2074 void G1CollectorPolicy::note_start_of_mark_thread() { | |
2075 _mark_thread_startup_sec = os::elapsedTime(); | |
2076 } | |
2077 | |
2078 class CountCSClosure: public HeapRegionClosure { | |
2079 G1CollectorPolicy* _g1_policy; | |
2080 public: | |
2081 CountCSClosure(G1CollectorPolicy* g1_policy) : | |
2082 _g1_policy(g1_policy) {} | |
2083 bool doHeapRegion(HeapRegion* r) { | |
2084 _g1_policy->_bytes_in_collection_set_before_gc += r->used(); | |
2085 return false; | |
2086 } | |
2087 }; | |
2088 | |
2089 void G1CollectorPolicy::count_CS_bytes_used() { | |
2090 CountCSClosure cs_closure(this); | |
2091 _g1->collection_set_iterate(&cs_closure); | |
2092 } | |
2093 | |
2094 void G1CollectorPolicy::print_summary (int level, | |
2095 const char* str, | |
2096 NumberSeq* seq) const { | |
2097 double sum = seq->sum(); | |
2363
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2098 LineBuffer(level + 1).append_and_print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", |
342 | 2099 str, sum / 1000.0, seq->avg()); |
2100 } | |
2101 | |
2102 void G1CollectorPolicy::print_summary_sd (int level, | |
2103 const char* str, | |
2104 NumberSeq* seq) const { | |
2105 print_summary(level, str, seq); | |
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2106 LineBuffer(level + 6).append_and_print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", |
342 | 2107 seq->num(), seq->sd(), seq->maximum()); |
2108 } | |
2109 | |
2110 void G1CollectorPolicy::check_other_times(int level, | |
2111 NumberSeq* other_times_ms, | |
2112 NumberSeq* calc_other_times_ms) const { | |
2113 bool should_print = false; | |
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2114 LineBuffer buf(level + 2); |
342 | 2115 |
2116 double max_sum = MAX2(fabs(other_times_ms->sum()), | |
2117 fabs(calc_other_times_ms->sum())); | |
2118 double min_sum = MIN2(fabs(other_times_ms->sum()), | |
2119 fabs(calc_other_times_ms->sum())); | |
2120 double sum_ratio = max_sum / min_sum; | |
2121 if (sum_ratio > 1.1) { | |
2122 should_print = true; | |
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2123 buf.append_and_print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); |
342 | 2124 } |
2125 | |
2126 double max_avg = MAX2(fabs(other_times_ms->avg()), | |
2127 fabs(calc_other_times_ms->avg())); | |
2128 double min_avg = MIN2(fabs(other_times_ms->avg()), | |
2129 fabs(calc_other_times_ms->avg())); | |
2130 double avg_ratio = max_avg / min_avg; | |
2131 if (avg_ratio > 1.1) { | |
2132 should_print = true; | |
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2133 buf.append_and_print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); |
342 | 2134 } |
2135 | |
2136 if (other_times_ms->sum() < -0.01) { | |
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2137 buf.append_and_print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); |
342 | 2138 } |
2139 | |
2140 if (other_times_ms->avg() < -0.01) { | |
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2141 buf.append_and_print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); |
342 | 2142 } |
2143 | |
2144 if (calc_other_times_ms->sum() < -0.01) { | |
2145 should_print = true; | |
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2146 buf.append_and_print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); |
342 | 2147 } |
2148 | |
2149 if (calc_other_times_ms->avg() < -0.01) { | |
2150 should_print = true; | |
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2151 buf.append_and_print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); |
342 | 2152 } |
2153 | |
2154 if (should_print) | |
2155 print_summary(level, "Other(Calc)", calc_other_times_ms); | |
2156 } | |
2157 | |
2158 void G1CollectorPolicy::print_summary(PauseSummary* summary) const { | |
1833
8b10f48633dc
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diff
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|
2159 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
342 | 2160 MainBodySummary* body_summary = summary->main_body_summary(); |
2161 if (summary->get_total_seq()->num() > 0) { | |
677 | 2162 print_summary_sd(0, "Evacuation Pauses", summary->get_total_seq()); |
342 | 2163 if (body_summary != NULL) { |
2164 print_summary(1, "SATB Drain", body_summary->get_satb_drain_seq()); | |
2165 if (parallel) { | |
2166 print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); | |
2167 print_summary(2, "Update RS", body_summary->get_update_rs_seq()); | |
2168 print_summary(2, "Ext Root Scanning", | |
2169 body_summary->get_ext_root_scan_seq()); | |
2170 print_summary(2, "Mark Stack Scanning", | |
2171 body_summary->get_mark_stack_scan_seq()); | |
2172 print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); | |
2173 print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); | |
2174 print_summary(2, "Termination", body_summary->get_termination_seq()); | |
2175 print_summary(2, "Other", body_summary->get_parallel_other_seq()); | |
2176 { | |
2177 NumberSeq* other_parts[] = { | |
2178 body_summary->get_update_rs_seq(), | |
2179 body_summary->get_ext_root_scan_seq(), | |
2180 body_summary->get_mark_stack_scan_seq(), | |
2181 body_summary->get_scan_rs_seq(), | |
2182 body_summary->get_obj_copy_seq(), | |
2183 body_summary->get_termination_seq() | |
2184 }; | |
2185 NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), | |
1779 | 2186 6, other_parts); |
342 | 2187 check_other_times(2, body_summary->get_parallel_other_seq(), |
2188 &calc_other_times_ms); | |
2189 } | |
2190 print_summary(1, "Mark Closure", body_summary->get_mark_closure_seq()); | |
2191 print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); | |
2192 } else { | |
2193 print_summary(1, "Update RS", body_summary->get_update_rs_seq()); | |
2194 print_summary(1, "Ext Root Scanning", | |
2195 body_summary->get_ext_root_scan_seq()); | |
2196 print_summary(1, "Mark Stack Scanning", | |
2197 body_summary->get_mark_stack_scan_seq()); | |
2198 print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); | |
2199 print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); | |
2200 } | |
2201 } | |
2202 print_summary(1, "Other", summary->get_other_seq()); | |
2203 { | |
1779 | 2204 if (body_summary != NULL) { |
2205 NumberSeq calc_other_times_ms; | |
2206 if (parallel) { | |
2207 // parallel | |
2208 NumberSeq* other_parts[] = { | |
2209 body_summary->get_satb_drain_seq(), | |
2210 body_summary->get_parallel_seq(), | |
2211 body_summary->get_clear_ct_seq() | |
2212 }; | |
2213 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
2214 3, other_parts); | |
2215 } else { | |
2216 // serial | |
2217 NumberSeq* other_parts[] = { | |
2218 body_summary->get_satb_drain_seq(), | |
2219 body_summary->get_update_rs_seq(), | |
2220 body_summary->get_ext_root_scan_seq(), | |
2221 body_summary->get_mark_stack_scan_seq(), | |
2222 body_summary->get_scan_rs_seq(), | |
2223 body_summary->get_obj_copy_seq() | |
2224 }; | |
2225 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
2226 6, other_parts); | |
2227 } | |
2228 check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); | |
342 | 2229 } |
2230 } | |
2231 } else { | |
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2232 LineBuffer(1).append_and_print_cr("none"); |
342 | 2233 } |
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2234 LineBuffer(0).append_and_print_cr(""); |
342 | 2235 } |
2236 | |
2237 void G1CollectorPolicy::print_tracing_info() const { | |
2238 if (TraceGen0Time) { | |
2239 gclog_or_tty->print_cr("ALL PAUSES"); | |
2240 print_summary_sd(0, "Total", _all_pause_times_ms); | |
2241 gclog_or_tty->print_cr(""); | |
2242 gclog_or_tty->print_cr(""); | |
2243 gclog_or_tty->print_cr(" Full Young GC Pauses: %8d", _full_young_pause_num); | |
2244 gclog_or_tty->print_cr(" Partial Young GC Pauses: %8d", _partial_young_pause_num); | |
2245 gclog_or_tty->print_cr(""); | |
2246 | |
677 | 2247 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
2248 print_summary(_summary); | |
342 | 2249 |
2250 gclog_or_tty->print_cr("MISC"); | |
2251 print_summary_sd(0, "Stop World", _all_stop_world_times_ms); | |
2252 print_summary_sd(0, "Yields", _all_yield_times_ms); | |
2253 for (int i = 0; i < _aux_num; ++i) { | |
2254 if (_all_aux_times_ms[i].num() > 0) { | |
2255 char buffer[96]; | |
2256 sprintf(buffer, "Aux%d", i); | |
2257 print_summary_sd(0, buffer, &_all_aux_times_ms[i]); | |
2258 } | |
2259 } | |
2260 | |
2261 size_t all_region_num = _region_num_young + _region_num_tenured; | |
2262 gclog_or_tty->print_cr(" New Regions %8d, Young %8d (%6.2lf%%), " | |
2263 "Tenured %8d (%6.2lf%%)", | |
2264 all_region_num, | |
2265 _region_num_young, | |
2266 (double) _region_num_young / (double) all_region_num * 100.0, | |
2267 _region_num_tenured, | |
2268 (double) _region_num_tenured / (double) all_region_num * 100.0); | |
2269 } | |
2270 if (TraceGen1Time) { | |
2271 if (_all_full_gc_times_ms->num() > 0) { | |
2272 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", | |
2273 _all_full_gc_times_ms->num(), | |
2274 _all_full_gc_times_ms->sum() / 1000.0); | |
2275 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); | |
2276 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", | |
2277 _all_full_gc_times_ms->sd(), | |
2278 _all_full_gc_times_ms->maximum()); | |
2279 } | |
2280 } | |
2281 } | |
2282 | |
2283 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
2284 #ifndef PRODUCT | |
2285 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
2286 // add this call for any other surv rate groups | |
2287 #endif // PRODUCT | |
2288 } | |
2289 | |
1973 | 2290 void |
2291 G1CollectorPolicy::update_region_num(bool young) { | |
2292 if (young) { | |
342 | 2293 ++_region_num_young; |
2294 } else { | |
2295 ++_region_num_tenured; | |
2296 } | |
2297 } | |
2298 | |
2299 #ifndef PRODUCT | |
2300 // for debugging, bit of a hack... | |
2301 static char* | |
2302 region_num_to_mbs(int length) { | |
2303 static char buffer[64]; | |
2304 double bytes = (double) (length * HeapRegion::GrainBytes); | |
2305 double mbs = bytes / (double) (1024 * 1024); | |
2306 sprintf(buffer, "%7.2lfMB", mbs); | |
2307 return buffer; | |
2308 } | |
2309 #endif // PRODUCT | |
2310 | |
545 | 2311 size_t G1CollectorPolicy::max_regions(int purpose) { |
342 | 2312 switch (purpose) { |
2313 case GCAllocForSurvived: | |
545 | 2314 return _max_survivor_regions; |
342 | 2315 case GCAllocForTenured: |
545 | 2316 return REGIONS_UNLIMITED; |
342 | 2317 default: |
545 | 2318 ShouldNotReachHere(); |
2319 return REGIONS_UNLIMITED; | |
342 | 2320 }; |
2321 } | |
2322 | |
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2323 void G1CollectorPolicy::calculate_max_gc_locker_expansion() { |
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2324 size_t expansion_region_num = 0; |
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2325 if (GCLockerEdenExpansionPercent > 0) { |
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2326 double perc = (double) GCLockerEdenExpansionPercent / 100.0; |
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2327 double expansion_region_num_d = perc * (double) _young_list_target_length; |
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2328 // We use ceiling so that if expansion_region_num_d is > 0.0 (but |
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2329 // less than 1.0) we'll get 1. |
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2330 expansion_region_num = (size_t) ceil(expansion_region_num_d); |
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|
2331 } else { |
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diff
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|
2332 assert(expansion_region_num == 0, "sanity"); |
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|
2333 } |
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|
2334 _young_list_max_length = _young_list_target_length + expansion_region_num; |
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|
2335 assert(_young_list_target_length <= _young_list_max_length, "post-condition"); |
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|
2336 } |
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|
2337 |
545 | 2338 // Calculates survivor space parameters. |
2339 void G1CollectorPolicy::calculate_survivors_policy() | |
2340 { | |
2341 if (G1FixedSurvivorSpaceSize == 0) { | |
2342 _max_survivor_regions = _young_list_target_length / SurvivorRatio; | |
2343 } else { | |
547
1e458753107d
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diff
changeset
|
2344 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
545 | 2345 } |
2346 | |
2347 if (G1FixedTenuringThreshold) { | |
2348 _tenuring_threshold = MaxTenuringThreshold; | |
2349 } else { | |
2350 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( | |
2351 HeapRegion::GrainWords * _max_survivor_regions); | |
2352 } | |
2353 } | |
2354 | |
342 | 2355 #ifndef PRODUCT |
2356 class HRSortIndexIsOKClosure: public HeapRegionClosure { | |
2357 CollectionSetChooser* _chooser; | |
2358 public: | |
2359 HRSortIndexIsOKClosure(CollectionSetChooser* chooser) : | |
2360 _chooser(chooser) {} | |
2361 | |
2362 bool doHeapRegion(HeapRegion* r) { | |
2363 if (!r->continuesHumongous()) { | |
2364 assert(_chooser->regionProperlyOrdered(r), "Ought to be."); | |
2365 } | |
2366 return false; | |
2367 } | |
2368 }; | |
2369 | |
2370 bool G1CollectorPolicy_BestRegionsFirst::assertMarkedBytesDataOK() { | |
2371 HRSortIndexIsOKClosure cl(_collectionSetChooser); | |
2372 _g1->heap_region_iterate(&cl); | |
2373 return true; | |
2374 } | |
2375 #endif | |
2376 | |
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|
2377 bool |
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|
2378 G1CollectorPolicy::force_initial_mark_if_outside_cycle() { |
4e5661ba9d98
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diff
changeset
|
2379 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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diff
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|
2380 if (!during_cycle) { |
4e5661ba9d98
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diff
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|
2381 set_initiate_conc_mark_if_possible(); |
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diff
changeset
|
2382 return true; |
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diff
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|
2383 } else { |
4e5661ba9d98
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|
2384 return false; |
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diff
changeset
|
2385 } |
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|
2386 } |
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|
2387 |
342 | 2388 void |
1359
23b1b27ac76c
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diff
changeset
|
2389 G1CollectorPolicy::decide_on_conc_mark_initiation() { |
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2390 // We are about to decide on whether this pause will be an |
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2391 // initial-mark pause. |
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2392 |
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2393 // First, during_initial_mark_pause() should not be already set. We |
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2394 // will set it here if we have to. However, it should be cleared by |
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2395 // the end of the pause (it's only set for the duration of an |
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2396 // initial-mark pause). |
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2397 assert(!during_initial_mark_pause(), "pre-condition"); |
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2398 |
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2399 if (initiate_conc_mark_if_possible()) { |
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2400 // We had noticed on a previous pause that the heap occupancy has |
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2401 // gone over the initiating threshold and we should start a |
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2402 // concurrent marking cycle. So we might initiate one. |
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2403 |
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2404 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2405 if (!during_cycle) { |
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2406 // The concurrent marking thread is not "during a cycle", i.e., |
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2407 // it has completed the last one. So we can go ahead and |
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2408 // initiate a new cycle. |
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2409 |
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2410 set_during_initial_mark_pause(); |
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2411 |
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2412 // And we can now clear initiate_conc_mark_if_possible() as |
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2413 // we've already acted on it. |
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2414 clear_initiate_conc_mark_if_possible(); |
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2415 } else { |
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2416 // The concurrent marking thread is still finishing up the |
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2417 // previous cycle. If we start one right now the two cycles |
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2418 // overlap. In particular, the concurrent marking thread might |
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2419 // be in the process of clearing the next marking bitmap (which |
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2420 // we will use for the next cycle if we start one). Starting a |
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2421 // cycle now will be bad given that parts of the marking |
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2422 // information might get cleared by the marking thread. And we |
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2423 // cannot wait for the marking thread to finish the cycle as it |
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2424 // periodically yields while clearing the next marking bitmap |
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2425 // and, if it's in a yield point, it's waiting for us to |
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2426 // finish. So, at this point we will not start a cycle and we'll |
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2427 // let the concurrent marking thread complete the last one. |
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2428 } |
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2429 } |
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2430 } |
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2431 |
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2432 void |
342 | 2433 G1CollectorPolicy_BestRegionsFirst:: |
2434 record_collection_pause_start(double start_time_sec, size_t start_used) { | |
2435 G1CollectorPolicy::record_collection_pause_start(start_time_sec, start_used); | |
2436 } | |
2437 | |
2438 class NextNonCSElemFinder: public HeapRegionClosure { | |
2439 HeapRegion* _res; | |
2440 public: | |
2441 NextNonCSElemFinder(): _res(NULL) {} | |
2442 bool doHeapRegion(HeapRegion* r) { | |
2443 if (!r->in_collection_set()) { | |
2444 _res = r; | |
2445 return true; | |
2446 } else { | |
2447 return false; | |
2448 } | |
2449 } | |
2450 HeapRegion* res() { return _res; } | |
2451 }; | |
2452 | |
2453 class KnownGarbageClosure: public HeapRegionClosure { | |
2454 CollectionSetChooser* _hrSorted; | |
2455 | |
2456 public: | |
2457 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
2458 _hrSorted(hrSorted) | |
2459 {} | |
2460 | |
2461 bool doHeapRegion(HeapRegion* r) { | |
2462 // We only include humongous regions in collection | |
2463 // sets when concurrent mark shows that their contained object is | |
2464 // unreachable. | |
2465 | |
2466 // Do we have any marking information for this region? | |
2467 if (r->is_marked()) { | |
2468 // We don't include humongous regions in collection | |
2469 // sets because we collect them immediately at the end of a marking | |
2470 // cycle. We also don't include young regions because we *must* | |
2471 // include them in the next collection pause. | |
2472 if (!r->isHumongous() && !r->is_young()) { | |
2473 _hrSorted->addMarkedHeapRegion(r); | |
2474 } | |
2475 } | |
2476 return false; | |
2477 } | |
2478 }; | |
2479 | |
2480 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
2481 CollectionSetChooser* _hrSorted; | |
2482 jint _marked_regions_added; | |
2483 jint _chunk_size; | |
2484 jint _cur_chunk_idx; | |
2485 jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) | |
2486 int _worker; | |
2487 int _invokes; | |
2488 | |
2489 void get_new_chunk() { | |
2490 _cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size); | |
2491 _cur_chunk_end = _cur_chunk_idx + _chunk_size; | |
2492 } | |
2493 void add_region(HeapRegion* r) { | |
2494 if (_cur_chunk_idx == _cur_chunk_end) { | |
2495 get_new_chunk(); | |
2496 } | |
2497 assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); | |
2498 _hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r); | |
2499 _marked_regions_added++; | |
2500 _cur_chunk_idx++; | |
2501 } | |
2502 | |
2503 public: | |
2504 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
2505 jint chunk_size, | |
2506 int worker) : | |
2507 _hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker), | |
2508 _marked_regions_added(0), _cur_chunk_idx(0), _cur_chunk_end(0), | |
2509 _invokes(0) | |
2510 {} | |
2511 | |
2512 bool doHeapRegion(HeapRegion* r) { | |
2513 // We only include humongous regions in collection | |
2514 // sets when concurrent mark shows that their contained object is | |
2515 // unreachable. | |
2516 _invokes++; | |
2517 | |
2518 // Do we have any marking information for this region? | |
2519 if (r->is_marked()) { | |
2520 // We don't include humongous regions in collection | |
2521 // sets because we collect them immediately at the end of a marking | |
2522 // cycle. | |
2523 // We also do not include young regions in collection sets | |
2524 if (!r->isHumongous() && !r->is_young()) { | |
2525 add_region(r); | |
2526 } | |
2527 } | |
2528 return false; | |
2529 } | |
2530 jint marked_regions_added() { return _marked_regions_added; } | |
2531 int invokes() { return _invokes; } | |
2532 }; | |
2533 | |
2534 class ParKnownGarbageTask: public AbstractGangTask { | |
2535 CollectionSetChooser* _hrSorted; | |
2536 jint _chunk_size; | |
2537 G1CollectedHeap* _g1; | |
2538 public: | |
2539 ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) : | |
2540 AbstractGangTask("ParKnownGarbageTask"), | |
2541 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
2542 _g1(G1CollectedHeap::heap()) | |
2543 {} | |
2544 | |
2545 void work(int i) { | |
2546 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size, i); | |
2547 // Back to zero for the claim value. | |
355 | 2548 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, i, |
2549 HeapRegion::InitialClaimValue); | |
342 | 2550 jint regions_added = parKnownGarbageCl.marked_regions_added(); |
2551 _hrSorted->incNumMarkedHeapRegions(regions_added); | |
2552 if (G1PrintParCleanupStats) { | |
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2553 gclog_or_tty->print_cr(" Thread %d called %d times, added %d regions to list.", |
342 | 2554 i, parKnownGarbageCl.invokes(), regions_added); |
2555 } | |
2556 } | |
2557 }; | |
2558 | |
2559 void | |
2560 G1CollectorPolicy_BestRegionsFirst:: | |
2561 record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
2562 size_t max_live_bytes) { | |
2563 double start; | |
2564 if (G1PrintParCleanupStats) start = os::elapsedTime(); | |
2565 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
2566 | |
2567 _collectionSetChooser->clearMarkedHeapRegions(); | |
2568 double clear_marked_end; | |
2569 if (G1PrintParCleanupStats) { | |
2570 clear_marked_end = os::elapsedTime(); | |
2571 gclog_or_tty->print_cr(" clear marked regions + work1: %8.3f ms.", | |
2572 (clear_marked_end - start)*1000.0); | |
2573 } | |
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2574 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 2575 const size_t OverpartitionFactor = 4; |
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2576 const size_t MinWorkUnit = 8; |
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2577 const size_t WorkUnit = |
342 | 2578 MAX2(_g1->n_regions() / (ParallelGCThreads * OverpartitionFactor), |
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2579 MinWorkUnit); |
342 | 2580 _collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(), |
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2581 WorkUnit); |
342 | 2582 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
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2583 (int) WorkUnit); |
342 | 2584 _g1->workers()->run_task(&parKnownGarbageTask); |
355 | 2585 |
2586 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2587 "sanity check"); | |
342 | 2588 } else { |
2589 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
2590 _g1->heap_region_iterate(&knownGarbagecl); | |
2591 } | |
2592 double known_garbage_end; | |
2593 if (G1PrintParCleanupStats) { | |
2594 known_garbage_end = os::elapsedTime(); | |
2595 gclog_or_tty->print_cr(" compute known garbage: %8.3f ms.", | |
2596 (known_garbage_end - clear_marked_end)*1000.0); | |
2597 } | |
2598 _collectionSetChooser->sortMarkedHeapRegions(); | |
2599 double sort_end; | |
2600 if (G1PrintParCleanupStats) { | |
2601 sort_end = os::elapsedTime(); | |
2602 gclog_or_tty->print_cr(" sorting: %8.3f ms.", | |
2603 (sort_end - known_garbage_end)*1000.0); | |
2604 } | |
2605 | |
2606 record_concurrent_mark_cleanup_end_work2(); | |
2607 double work2_end; | |
2608 if (G1PrintParCleanupStats) { | |
2609 work2_end = os::elapsedTime(); | |
2610 gclog_or_tty->print_cr(" work2: %8.3f ms.", | |
2611 (work2_end - sort_end)*1000.0); | |
2612 } | |
2613 } | |
2614 | |
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2615 // Add the heap region at the head of the non-incremental collection set |
342 | 2616 void G1CollectorPolicy:: |
2617 add_to_collection_set(HeapRegion* hr) { | |
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2618 assert(_inc_cset_build_state == Active, "Precondition"); |
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2619 assert(!hr->is_young(), "non-incremental add of young region"); |
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2620 |
1282 | 2621 if (G1PrintHeapRegions) { |
1388 | 2622 gclog_or_tty->print_cr("added region to cset " |
2623 "%d:["PTR_FORMAT", "PTR_FORMAT"], " | |
2624 "top "PTR_FORMAT", %s", | |
2625 hr->hrs_index(), hr->bottom(), hr->end(), | |
2626 hr->top(), hr->is_young() ? "YOUNG" : "NOT_YOUNG"); | |
342 | 2627 } |
2628 | |
2629 if (_g1->mark_in_progress()) | |
2630 _g1->concurrent_mark()->registerCSetRegion(hr); | |
2631 | |
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2632 assert(!hr->in_collection_set(), "should not already be in the CSet"); |
342 | 2633 hr->set_in_collection_set(true); |
2634 hr->set_next_in_collection_set(_collection_set); | |
2635 _collection_set = hr; | |
2636 _collection_set_size++; | |
2637 _collection_set_bytes_used_before += hr->used(); | |
526 | 2638 _g1->register_region_with_in_cset_fast_test(hr); |
342 | 2639 } |
2640 | |
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2641 // Initialize the per-collection-set information |
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2642 void G1CollectorPolicy::start_incremental_cset_building() { |
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2643 assert(_inc_cset_build_state == Inactive, "Precondition"); |
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2644 |
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2645 _inc_cset_head = NULL; |
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2646 _inc_cset_tail = NULL; |
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2647 _inc_cset_size = 0; |
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2648 _inc_cset_bytes_used_before = 0; |
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2649 |
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2650 if (in_young_gc_mode()) { |
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2651 _inc_cset_young_index = 0; |
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2652 } |
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2653 |
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2654 _inc_cset_max_finger = 0; |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2655 _inc_cset_recorded_young_bytes = 0; |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2656 _inc_cset_recorded_rs_lengths = 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
|
2657 _inc_cset_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
|
2658 _inc_cset_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
|
2659 _inc_cset_build_state = Active; |
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
|
2660 } |
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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
|
2661 |
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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
|
2662 void G1CollectorPolicy::add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
2663 // This routine is used when: |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2664 // * adding survivor regions to the incremental cset at the end of an |
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
|
2665 // evacuation pause, |
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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
|
2666 // * adding the current allocation region to the incremental cset |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
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|
2667 // when it is retired, and |
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
|
2668 // * updating existing policy information for a region in the |
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
|
2669 // incremental cset via young list RSet sampling. |
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
|
2670 // Therefore this routine may be called at a safepoint by the |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2671 // VM thread, or in-between safepoints by mutator threads (when |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2672 // retiring the current allocation region) or a concurrent |
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
|
2673 // refine thread (RSet sampling). |
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
|
2674 |
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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
|
2675 double region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, true); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2676 size_t used_bytes = hr->used(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2677 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2678 _inc_cset_recorded_rs_lengths += rs_length; |
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|
2679 _inc_cset_predicted_elapsed_time_ms += region_elapsed_time_ms; |
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diff
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|
2680 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2681 _inc_cset_bytes_used_before += used_bytes; |
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diff
changeset
|
2682 |
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diff
changeset
|
2683 // Cache the values we have added to the aggregated informtion |
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|
2684 // in the heap region in case we have to remove this region from |
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changeset
|
2685 // the incremental collection set, or it is updated by the |
1316cec51b4d
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diff
changeset
|
2686 // rset sampling code |
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diff
changeset
|
2687 hr->set_recorded_rs_length(rs_length); |
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|
2688 hr->set_predicted_elapsed_time_ms(region_elapsed_time_ms); |
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parents:
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diff
changeset
|
2689 |
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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
|
2690 #if PREDICTIONS_VERBOSE |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2691 size_t bytes_to_copy = predict_bytes_to_copy(hr); |
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changeset
|
2692 _inc_cset_predicted_bytes_to_copy += bytes_to_copy; |
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parents:
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diff
changeset
|
2693 |
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diff
changeset
|
2694 // Record the number of bytes used in this region |
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changeset
|
2695 _inc_cset_recorded_young_bytes += used_bytes; |
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parents:
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diff
changeset
|
2696 |
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diff
changeset
|
2697 // Cache the values we have added to the aggregated informtion |
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diff
changeset
|
2698 // in the heap region in case we have to remove this region from |
1316cec51b4d
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parents:
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diff
changeset
|
2699 // the incremental collection set, or it is updated by the |
1316cec51b4d
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parents:
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diff
changeset
|
2700 // rset sampling code |
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parents:
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diff
changeset
|
2701 hr->set_predicted_bytes_to_copy(bytes_to_copy); |
1316cec51b4d
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parents:
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changeset
|
2702 #endif // PREDICTIONS_VERBOSE |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2703 } |
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
|
2704 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2705 void G1CollectorPolicy::remove_from_incremental_cset_info(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
|
2706 // This routine is currently only called as part of the updating of |
1316cec51b4d
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diff
changeset
|
2707 // existing policy information for regions in the incremental cset that |
1316cec51b4d
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parents:
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diff
changeset
|
2708 // is performed by the concurrent refine thread(s) as part of young list |
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parents:
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diff
changeset
|
2709 // RSet sampling. Therefore we should not be at a safepoint. |
1316cec51b4d
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parents:
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diff
changeset
|
2710 |
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
|
2711 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); |
1316cec51b4d
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parents:
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diff
changeset
|
2712 assert(hr->is_young(), "it should be"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2713 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2714 size_t used_bytes = hr->used(); |
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parents:
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diff
changeset
|
2715 size_t old_rs_length = hr->recorded_rs_length(); |
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parents:
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diff
changeset
|
2716 double old_elapsed_time_ms = hr->predicted_elapsed_time_ms(); |
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parents:
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diff
changeset
|
2717 |
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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 // 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
|
2719 // 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
|
2720 _inc_cset_recorded_rs_lengths -= old_rs_length; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2721 _inc_cset_predicted_elapsed_time_ms -= old_elapsed_time_ms; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2722 |
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
|
2723 _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
|
2724 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2725 // 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
|
2726 hr->set_recorded_rs_length(0); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2727 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
|
2728 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2729 #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
|
2730 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
|
2731 _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
|
2732 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2733 // Subtract the number of bytes used in this region |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2734 _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
|
2735 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2736 // Clear the values cached in the heap region |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2737 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
|
2738 #endif // PREDICTIONS_VERBOSE |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2739 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
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 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:
1391
diff
changeset
|
2742 // 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
|
2743 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
|
2744 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2745 remove_from_incremental_cset_info(hr); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2746 add_to_incremental_cset_info(hr, new_rs_length); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2747 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2748 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2749 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
|
2750 assert( hr->is_young(), "invariant"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2751 assert( hr->young_index_in_cset() == -1, "invariant" ); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2752 assert(_inc_cset_build_state == Active, "Precondition"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2753 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2754 // We need to clear and set the cached recorded/cached collection set |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2755 // information in the heap region here (before the region gets added |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2756 // to the collection set). An individual heap region's cached values |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2757 // are calculated, aggregated with the policy collection set info, |
1316cec51b4d
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parents:
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diff
changeset
|
2758 // and cached in the heap region here (initially) and (subsequently) |
1316cec51b4d
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parents:
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diff
changeset
|
2759 // by the Young List sampling code. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2760 |
1316cec51b4d
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parents:
1391
diff
changeset
|
2761 size_t rs_length = hr->rem_set()->occupied(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2762 add_to_incremental_cset_info(hr, 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
|
2763 |
1316cec51b4d
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parents:
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diff
changeset
|
2764 HeapWord* hr_end = hr->end(); |
1316cec51b4d
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parents:
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diff
changeset
|
2765 _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
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parents:
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diff
changeset
|
2766 |
1316cec51b4d
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parents:
1391
diff
changeset
|
2767 assert(!hr->in_collection_set(), "invariant"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2768 hr->set_in_collection_set(true); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2769 assert( hr->next_in_collection_set() == NULL, "invariant"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2770 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2771 _inc_cset_size++; |
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
|
2772 _g1->register_region_with_in_cset_fast_test(hr); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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|
2773 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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|
2774 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:
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|
2775 ++_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 } |
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 // 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:
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diff
changeset
|
2779 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:
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changeset
|
2780 // 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
|
2781 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
|
2782 |
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
|
2783 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2784 add_region_to_incremental_cset_common(hr); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2785 |
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
|
2786 // 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:
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diff
changeset
|
2787 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
|
2788 assert(_inc_cset_head == NULL, "invariant"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2789 _inc_cset_head = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2790 } else { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2791 _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:
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diff
changeset
|
2792 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2793 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2794 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2795 if (G1PrintHeapRegions) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2796 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:
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diff
changeset
|
2797 "%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
|
2798 "top "PTR_FORMAT", young %s", |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2799 hr->hrs_index(), hr->bottom(), hr->end(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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changeset
|
2800 hr->top(), (hr->is_young()) ? "YES" : "NO"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2801 } |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2802 } |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2803 |
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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
|
2804 // 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
|
2805 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
|
2806 // 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
|
2807 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
|
2808 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2809 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2810 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
|
2811 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2812 // 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
|
2813 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
|
2814 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
|
2815 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
|
2816 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2817 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2818 _inc_cset_head = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2819 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2820 if (G1PrintHeapRegions) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2821 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
|
2822 "%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
|
2823 "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
|
2824 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
|
2825 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
|
2826 } |
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 #ifndef PRODUCT |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2830 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
|
2831 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
|
2832 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2833 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
|
2834 HeapRegion* csr = list_head; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2835 while (csr != NULL) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2836 HeapRegion* next = csr->next_in_collection_set(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2837 assert(csr->in_collection_set(), "bad CS"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2838 st->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2839 "age: %4d, y: %d, surv: %d", |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2840 csr->bottom(), csr->end(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2841 csr->top(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2842 csr->prev_top_at_mark_start(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2843 csr->next_top_at_mark_start(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2844 csr->top_at_conc_mark_count(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2845 csr->age_in_surv_rate_group_cond(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2846 csr->is_young(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2847 csr->is_survivor()); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2848 csr = next; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2849 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2850 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2851 #endif // !PRODUCT |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2852 |
1707 | 2853 void |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2854 G1CollectorPolicy_BestRegionsFirst::choose_collection_set( |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2855 double target_pause_time_ms) { |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2856 // Set this here - in case we're not doing young collections. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2857 double non_young_start_time_sec = os::elapsedTime(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2858 |
342 | 2859 start_recording_regions(); |
2860 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2861 guarantee(target_pause_time_ms > 0.0, |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2862 err_msg("target_pause_time_ms = %1.6lf should be positive", |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2863 target_pause_time_ms)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2864 guarantee(_collection_set == NULL, "Precondition"); |
342 | 2865 |
2866 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
2867 double predicted_pause_time_ms = base_time_ms; | |
2868 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2869 double time_remaining_ms = target_pause_time_ms - base_time_ms; |
342 | 2870 |
2871 // the 10% and 50% values are arbitrary... | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2872 if (time_remaining_ms < 0.10 * target_pause_time_ms) { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2873 time_remaining_ms = 0.50 * target_pause_time_ms; |
342 | 2874 _within_target = false; |
2875 } else { | |
2876 _within_target = true; | |
2877 } | |
2878 | |
2879 // We figure out the number of bytes available for future to-space. | |
2880 // For new regions without marking information, we must assume the | |
2881 // worst-case of complete survival. If we have marking information for a | |
2882 // region, we can bound the amount of live data. We can add a number of | |
2883 // such regions, as long as the sum of the live data bounds does not | |
2884 // exceed the available evacuation space. | |
2885 size_t max_live_bytes = _g1->free_regions() * HeapRegion::GrainBytes; | |
2886 | |
2887 size_t expansion_bytes = | |
2888 _g1->expansion_regions() * HeapRegion::GrainBytes; | |
2889 | |
677 | 2890 _collection_set_bytes_used_before = 0; |
2891 _collection_set_size = 0; | |
342 | 2892 |
2893 // Adjust for expansion and slop. | |
2894 max_live_bytes = max_live_bytes + expansion_bytes; | |
2895 | |
2896 HeapRegion* hr; | |
2897 if (in_young_gc_mode()) { | |
2898 double young_start_time_sec = os::elapsedTime(); | |
2899 | |
2900 if (G1PolicyVerbose > 0) { | |
2901 gclog_or_tty->print_cr("Adding %d young regions to the CSet", | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2902 _g1->young_list()->length()); |
342 | 2903 } |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2904 |
342 | 2905 _young_cset_length = 0; |
2906 _last_young_gc_full = full_young_gcs() ? true : false; | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2907 |
342 | 2908 if (_last_young_gc_full) |
2909 ++_full_young_pause_num; | |
2910 else | |
2911 ++_partial_young_pause_num; | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2912 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2913 // The young list is laid with the survivor regions from the previous |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2914 // pause are appended to the RHS of the young list, i.e. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2915 // [Newly Young Regions ++ Survivors from last pause]. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2916 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2917 hr = _g1->young_list()->first_survivor_region(); |
342 | 2918 while (hr != NULL) { |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2919 assert(hr->is_survivor(), "badly formed young list"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2920 hr->set_young(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2921 hr = hr->get_next_young_region(); |
342 | 2922 } |
2923 | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2924 // 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
|
2925 // all young now. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2926 _g1->young_list()->clear_survivors(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2927 |
1316cec51b4d
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2928 if (_g1->mark_in_progress()) |
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2929 _g1->concurrent_mark()->register_collection_set_finger(_inc_cset_max_finger); |
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2930 |
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2931 _young_cset_length = _inc_cset_young_index; |
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2932 _collection_set = _inc_cset_head; |
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2933 _collection_set_size = _inc_cset_size; |
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2934 _collection_set_bytes_used_before = _inc_cset_bytes_used_before; |
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2935 |
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2936 // For young regions in the collection set, we assume the worst |
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2937 // case of complete survival |
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2938 max_live_bytes -= _inc_cset_size * HeapRegion::GrainBytes; |
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2939 |
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2940 time_remaining_ms -= _inc_cset_predicted_elapsed_time_ms; |
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2941 predicted_pause_time_ms += _inc_cset_predicted_elapsed_time_ms; |
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2942 |
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2943 // The number of recorded young regions is the incremental |
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2944 // collection set's current size |
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2945 set_recorded_young_regions(_inc_cset_size); |
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2946 set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths); |
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2947 set_recorded_young_bytes(_inc_cset_recorded_young_bytes); |
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2948 #if PREDICTIONS_VERBOSE |
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2949 set_predicted_bytes_to_copy(_inc_cset_predicted_bytes_to_copy); |
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2950 #endif // PREDICTIONS_VERBOSE |
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2951 |
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2952 if (G1PolicyVerbose > 0) { |
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2953 gclog_or_tty->print_cr(" Added " PTR_FORMAT " Young Regions to CS.", |
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2954 _inc_cset_size); |
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2955 gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", |
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2956 max_live_bytes/K); |
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2957 } |
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2958 |
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2959 assert(_inc_cset_size == _g1->young_list()->length(), "Invariant"); |
342 | 2960 |
2961 double young_end_time_sec = os::elapsedTime(); | |
2962 _recorded_young_cset_choice_time_ms = | |
2963 (young_end_time_sec - young_start_time_sec) * 1000.0; | |
2964 | |
1394
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2965 // We are doing young collections so reset this. |
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2966 non_young_start_time_sec = young_end_time_sec; |
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2967 |
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2968 // Note we can use either _collection_set_size or |
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2969 // _young_cset_length here |
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2970 if (_collection_set_size > 0 && _last_young_gc_full) { |
342 | 2971 // don't bother adding more regions... |
2972 goto choose_collection_set_end; | |
2973 } | |
2974 } | |
2975 | |
2976 if (!in_young_gc_mode() || !full_young_gcs()) { | |
2977 bool should_continue = true; | |
2978 NumberSeq seq; | |
2979 double avg_prediction = 100000000000000000.0; // something very large | |
1394
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2980 |
342 | 2981 do { |
2982 hr = _collectionSetChooser->getNextMarkedRegion(time_remaining_ms, | |
2983 avg_prediction); | |
677 | 2984 if (hr != NULL) { |
342 | 2985 double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
2986 time_remaining_ms -= predicted_time_ms; | |
2987 predicted_pause_time_ms += predicted_time_ms; | |
2988 add_to_collection_set(hr); | |
1394
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2989 record_non_young_cset_region(hr); |
342 | 2990 max_live_bytes -= MIN2(hr->max_live_bytes(), max_live_bytes); |
2991 if (G1PolicyVerbose > 0) { | |
2992 gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", | |
2993 max_live_bytes/K); | |
2994 } | |
2995 seq.add(predicted_time_ms); | |
2996 avg_prediction = seq.avg() + seq.sd(); | |
2997 } | |
2998 should_continue = | |
2999 ( hr != NULL) && | |
3000 ( (adaptive_young_list_length()) ? time_remaining_ms > 0.0 | |
3001 : _collection_set_size < _young_list_fixed_length ); | |
3002 } while (should_continue); | |
3003 | |
3004 if (!adaptive_young_list_length() && | |
3005 _collection_set_size < _young_list_fixed_length) | |
3006 _should_revert_to_full_young_gcs = true; | |
3007 } | |
3008 | |
3009 choose_collection_set_end: | |
1394
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3010 stop_incremental_cset_building(); |
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3011 |
342 | 3012 count_CS_bytes_used(); |
3013 | |
3014 end_recording_regions(); | |
3015 | |
3016 double non_young_end_time_sec = os::elapsedTime(); | |
3017 _recorded_non_young_cset_choice_time_ms = | |
3018 (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; | |
3019 } | |
3020 | |
3021 void G1CollectorPolicy_BestRegionsFirst::record_full_collection_end() { | |
3022 G1CollectorPolicy::record_full_collection_end(); | |
3023 _collectionSetChooser->updateAfterFullCollection(); | |
3024 } | |
3025 | |
3026 void G1CollectorPolicy_BestRegionsFirst:: | |
3027 expand_if_possible(size_t numRegions) { | |
3028 size_t expansion_bytes = numRegions * HeapRegion::GrainBytes; | |
3029 _g1->expand(expansion_bytes); | |
3030 } | |
3031 | |
3032 void G1CollectorPolicy_BestRegionsFirst:: | |
1707 | 3033 record_collection_pause_end() { |
3034 G1CollectorPolicy::record_collection_pause_end(); | |
342 | 3035 assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end."); |
3036 } |