Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 3852:fdb992d83a87
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Reviewed-by: kvn, never, bdelsart
author | twisti |
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date | Tue, 16 Aug 2011 04:14:05 -0700 |
parents | 5f6f2615433a |
children | 14a2fd14c0db |
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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 | |
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242 _eden_bytes_before_gc(0), |
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243 _survivor_bytes_before_gc(0), |
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244 _capacity_before_gc(0), |
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245 |
342 | 246 _prev_collection_pause_used_at_end_bytes(0), |
247 | |
248 _collection_set(NULL), | |
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249 _collection_set_size(0), |
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250 _collection_set_bytes_used_before(0), |
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251 |
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252 // Incremental CSet attributes |
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253 _inc_cset_build_state(Inactive), |
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254 _inc_cset_head(NULL), |
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255 _inc_cset_tail(NULL), |
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256 _inc_cset_size(0), |
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257 _inc_cset_young_index(0), |
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258 _inc_cset_bytes_used_before(0), |
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259 _inc_cset_max_finger(NULL), |
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260 _inc_cset_recorded_young_bytes(0), |
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261 _inc_cset_recorded_rs_lengths(0), |
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262 _inc_cset_predicted_elapsed_time_ms(0.0), |
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263 _inc_cset_predicted_bytes_to_copy(0), |
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264 |
342 | 265 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
266 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
267 #endif // _MSC_VER | |
268 | |
269 _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", | |
270 G1YoungSurvRateNumRegionsSummary)), | |
271 _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", | |
545 | 272 G1YoungSurvRateNumRegionsSummary)), |
342 | 273 // add here any more surv rate groups |
545 | 274 _recorded_survivor_regions(0), |
275 _recorded_survivor_head(NULL), | |
276 _recorded_survivor_tail(NULL), | |
1356 | 277 _survivors_age_table(true), |
278 | |
279 _gc_overhead_perc(0.0) | |
545 | 280 |
342 | 281 { |
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282 // Set up the region size and associated fields. Given that the |
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283 // policy is created before the heap, we have to set this up here, |
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284 // so it's done as soon as possible. |
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285 HeapRegion::setup_heap_region_size(Arguments::min_heap_size()); |
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286 HeapRegionRemSet::setup_remset_size(); |
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287 |
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288 // Verify PLAB sizes |
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289 const uint region_size = HeapRegion::GrainWords; |
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290 if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
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291 char buffer[128]; |
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292 jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most %u", |
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293 OldPLABSize > region_size ? "Old" : "Young", region_size); |
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294 vm_exit_during_initialization(buffer); |
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295 } |
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296 |
342 | 297 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
298 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
299 | |
1611 | 300 _par_last_gc_worker_start_times_ms = new double[_parallel_gc_threads]; |
342 | 301 _par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads]; |
302 _par_last_mark_stack_scan_times_ms = new double[_parallel_gc_threads]; | |
303 | |
304 _par_last_update_rs_times_ms = new double[_parallel_gc_threads]; | |
305 _par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; | |
306 | |
307 _par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; | |
308 | |
309 _par_last_obj_copy_times_ms = new double[_parallel_gc_threads]; | |
310 | |
311 _par_last_termination_times_ms = new double[_parallel_gc_threads]; | |
1611 | 312 _par_last_termination_attempts = new double[_parallel_gc_threads]; |
313 _par_last_gc_worker_end_times_ms = new double[_parallel_gc_threads]; | |
2430 | 314 _par_last_gc_worker_times_ms = new double[_parallel_gc_threads]; |
342 | 315 |
316 // start conservatively | |
751 | 317 _expensive_region_limit_ms = 0.5 * (double) MaxGCPauseMillis; |
342 | 318 |
319 // <NEW PREDICTION> | |
320 | |
321 int index; | |
322 if (ParallelGCThreads == 0) | |
323 index = 0; | |
324 else if (ParallelGCThreads > 8) | |
325 index = 7; | |
326 else | |
327 index = ParallelGCThreads - 1; | |
328 | |
329 _pending_card_diff_seq->add(0.0); | |
330 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
331 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
332 _fully_young_cards_per_entry_ratio_seq->add( | |
333 fully_young_cards_per_entry_ratio_defaults[index]); | |
334 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); | |
335 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
336 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
337 _young_other_cost_per_region_ms_seq->add( | |
338 young_other_cost_per_region_ms_defaults[index]); | |
339 _non_young_other_cost_per_region_ms_seq->add( | |
340 non_young_other_cost_per_region_ms_defaults[index]); | |
341 | |
342 // </NEW PREDICTION> | |
343 | |
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344 // Below, we might need to calculate the pause time target based on |
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345 // the pause interval. When we do so we are going to give G1 maximum |
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346 // flexibility and allow it to do pauses when it needs to. So, we'll |
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347 // arrange that the pause interval to be pause time target + 1 to |
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348 // ensure that a) the pause time target is maximized with respect to |
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349 // the pause interval and b) we maintain the invariant that pause |
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350 // time target < pause interval. If the user does not want this |
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351 // maximum flexibility, they will have to set the pause interval |
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352 // explicitly. |
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353 |
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354 // First make sure that, if either parameter is set, its value is |
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355 // reasonable. |
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356 if (!FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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357 if (MaxGCPauseMillis < 1) { |
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358 vm_exit_during_initialization("MaxGCPauseMillis should be " |
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359 "greater than 0"); |
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360 } |
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361 } |
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362 if (!FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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363 if (GCPauseIntervalMillis < 1) { |
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364 vm_exit_during_initialization("GCPauseIntervalMillis should be " |
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365 "greater than 0"); |
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366 } |
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367 } |
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368 |
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369 // Then, if the pause time target parameter was not set, set it to |
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370 // the default value. |
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371 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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372 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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373 // The default pause time target in G1 is 200ms |
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374 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); |
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375 } else { |
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376 // We do not allow the pause interval to be set without the |
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377 // pause time target |
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378 vm_exit_during_initialization("GCPauseIntervalMillis cannot be set " |
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379 "without setting MaxGCPauseMillis"); |
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380 } |
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381 } |
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382 |
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383 // Then, if the interval parameter was not set, set it according to |
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384 // the pause time target (this will also deal with the case when the |
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385 // pause time target is the default value). |
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386 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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387 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); |
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388 } |
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389 |
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390 // Finally, make sure that the two parameters are consistent. |
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391 if (MaxGCPauseMillis >= GCPauseIntervalMillis) { |
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392 char buffer[256]; |
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393 jio_snprintf(buffer, 256, |
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394 "MaxGCPauseMillis (%u) should be less than " |
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395 "GCPauseIntervalMillis (%u)", |
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396 MaxGCPauseMillis, GCPauseIntervalMillis); |
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397 vm_exit_during_initialization(buffer); |
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398 } |
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399 |
751 | 400 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; |
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401 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
342 | 402 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); |
751 | 403 _sigma = (double) G1ConfidencePercent / 100.0; |
342 | 404 |
405 // start conservatively (around 50ms is about right) | |
406 _concurrent_mark_init_times_ms->add(0.05); | |
407 _concurrent_mark_remark_times_ms->add(0.05); | |
408 _concurrent_mark_cleanup_times_ms->add(0.20); | |
409 _tenuring_threshold = MaxTenuringThreshold; | |
410 | |
1282 | 411 // if G1FixedSurvivorSpaceSize is 0 which means the size is not |
412 // fixed, then _max_survivor_regions will be calculated at | |
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413 // calculate_young_list_target_length during initialization |
1282 | 414 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
545 | 415 |
1356 | 416 assert(GCTimeRatio > 0, |
417 "we should have set it to a default value set_g1_gc_flags() " | |
418 "if a user set it to 0"); | |
419 _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); | |
420 | |
342 | 421 initialize_all(); |
422 } | |
423 | |
424 // Increment "i", mod "len" | |
425 static void inc_mod(int& i, int len) { | |
426 i++; if (i == len) i = 0; | |
427 } | |
428 | |
429 void G1CollectorPolicy::initialize_flags() { | |
430 set_min_alignment(HeapRegion::GrainBytes); | |
431 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
547
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432 if (SurvivorRatio < 1) { |
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433 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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434 } |
342 | 435 CollectorPolicy::initialize_flags(); |
436 } | |
437 | |
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438 // The easiest way to deal with the parsing of the NewSize / |
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439 // MaxNewSize / etc. parameteres is to re-use the code in the |
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440 // TwoGenerationCollectorPolicy class. This is similar to what |
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441 // ParallelScavenge does with its GenerationSizer class (see |
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442 // ParallelScavengeHeap::initialize()). We might change this in the |
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443 // future, but it's a good start. |
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444 class G1YoungGenSizer : public TwoGenerationCollectorPolicy { |
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445 size_t size_to_region_num(size_t byte_size) { |
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446 return MAX2((size_t) 1, byte_size / HeapRegion::GrainBytes); |
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447 } |
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448 |
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449 public: |
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450 G1YoungGenSizer() { |
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451 initialize_flags(); |
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452 initialize_size_info(); |
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453 } |
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454 |
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455 size_t min_young_region_num() { |
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456 return size_to_region_num(_min_gen0_size); |
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457 } |
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458 size_t initial_young_region_num() { |
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459 return size_to_region_num(_initial_gen0_size); |
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460 } |
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461 size_t max_young_region_num() { |
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462 return size_to_region_num(_max_gen0_size); |
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463 } |
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464 }; |
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465 |
342 | 466 void G1CollectorPolicy::init() { |
467 // Set aside an initial future to_space. | |
468 _g1 = G1CollectedHeap::heap(); | |
469 | |
470 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
471 | |
545 | 472 initialize_gc_policy_counters(); |
473 | |
342 | 474 if (G1Gen) { |
475 _in_young_gc_mode = true; | |
476 | |
1285
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477 G1YoungGenSizer sizer; |
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478 size_t initial_region_num = sizer.initial_young_region_num(); |
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479 |
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480 if (UseAdaptiveSizePolicy) { |
342 | 481 set_adaptive_young_list_length(true); |
482 _young_list_fixed_length = 0; | |
483 } else { | |
484 set_adaptive_young_list_length(false); | |
1285
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485 _young_list_fixed_length = initial_region_num; |
342 | 486 } |
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487 _free_regions_at_end_of_collection = _g1->free_regions(); |
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488 calculate_young_list_min_length(); |
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489 guarantee( _young_list_min_length == 0, "invariant, not enough info" ); |
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490 calculate_young_list_target_length(); |
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491 } else { |
342 | 492 _young_list_fixed_length = 0; |
493 _in_young_gc_mode = false; | |
494 } | |
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495 |
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496 // We may immediately start allocating regions and placing them on the |
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497 // collection set list. Initialize the per-collection set info |
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498 start_incremental_cset_building(); |
342 | 499 } |
500 | |
545 | 501 // Create the jstat counters for the policy. |
502 void G1CollectorPolicy::initialize_gc_policy_counters() | |
503 { | |
504 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 2 + G1Gen); | |
505 } | |
506 | |
342 | 507 void G1CollectorPolicy::calculate_young_list_min_length() { |
508 _young_list_min_length = 0; | |
509 | |
510 if (!adaptive_young_list_length()) | |
511 return; | |
512 | |
513 if (_alloc_rate_ms_seq->num() > 3) { | |
514 double now_sec = os::elapsedTime(); | |
515 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; | |
516 double alloc_rate_ms = predict_alloc_rate_ms(); | |
1973 | 517 size_t min_regions = (size_t) ceil(alloc_rate_ms * when_ms); |
518 size_t current_region_num = _g1->young_list()->length(); | |
342 | 519 _young_list_min_length = min_regions + current_region_num; |
520 } | |
521 } | |
522 | |
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523 void G1CollectorPolicy::calculate_young_list_target_length() { |
342 | 524 if (adaptive_young_list_length()) { |
525 size_t rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); | |
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526 calculate_young_list_target_length(rs_lengths); |
342 | 527 } else { |
528 if (full_young_gcs()) | |
529 _young_list_target_length = _young_list_fixed_length; | |
530 else | |
531 _young_list_target_length = _young_list_fixed_length / 2; | |
532 } | |
1973 | 533 |
534 // Make sure we allow the application to allocate at least one | |
535 // region before we need to do a collection again. | |
536 size_t min_length = _g1->young_list()->length() + 1; | |
537 _young_list_target_length = MAX2(_young_list_target_length, min_length); | |
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538 calculate_max_gc_locker_expansion(); |
545 | 539 calculate_survivors_policy(); |
342 | 540 } |
541 | |
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542 void G1CollectorPolicy::calculate_young_list_target_length(size_t rs_lengths) { |
342 | 543 guarantee( adaptive_young_list_length(), "pre-condition" ); |
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544 guarantee( !_in_marking_window || !_last_full_young_gc, "invariant" ); |
342 | 545 |
546 double start_time_sec = os::elapsedTime(); | |
1282 | 547 size_t min_reserve_perc = MAX2((size_t)2, (size_t)G1ReservePercent); |
342 | 548 min_reserve_perc = MIN2((size_t) 50, min_reserve_perc); |
549 size_t reserve_regions = | |
550 (size_t) ((double) min_reserve_perc * (double) _g1->n_regions() / 100.0); | |
551 | |
552 if (full_young_gcs() && _free_regions_at_end_of_collection > 0) { | |
553 // we are in fully-young mode and there are free regions in the heap | |
554 | |
545 | 555 double survivor_regions_evac_time = |
556 predict_survivor_regions_evac_time(); | |
557 | |
342 | 558 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
559 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); | |
560 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); | |
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561 size_t scanned_cards = predict_young_card_num(adj_rs_lengths); |
545 | 562 double base_time_ms = predict_base_elapsed_time_ms(pending_cards, scanned_cards) |
563 + survivor_regions_evac_time; | |
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564 |
342 | 565 // the result |
566 size_t final_young_length = 0; | |
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567 |
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568 size_t init_free_regions = |
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569 MAX2((size_t)0, _free_regions_at_end_of_collection - reserve_regions); |
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570 |
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571 // if we're still under the pause target... |
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572 if (base_time_ms <= target_pause_time_ms) { |
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573 // We make sure that the shortest young length that makes sense |
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574 // fits within the target pause time. |
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575 size_t min_young_length = 1; |
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576 |
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577 if (predict_will_fit(min_young_length, base_time_ms, |
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578 init_free_regions, target_pause_time_ms)) { |
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579 // The shortest young length will fit within the target pause time; |
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580 // we'll now check whether the absolute maximum number of young |
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581 // regions will fit in the target pause time. If not, we'll do |
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582 // a binary search between min_young_length and max_young_length |
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583 size_t abs_max_young_length = _free_regions_at_end_of_collection - 1; |
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584 size_t max_young_length = abs_max_young_length; |
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585 |
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586 if (max_young_length > min_young_length) { |
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587 // Let's check if the initial max young length will fit within the |
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588 // target pause. If so then there is no need to search for a maximal |
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589 // young length - we'll return the initial maximum |
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590 |
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591 if (predict_will_fit(max_young_length, base_time_ms, |
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592 init_free_regions, target_pause_time_ms)) { |
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593 // The maximum young length will satisfy the target pause time. |
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594 // We are done so set min young length to this maximum length. |
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595 // The code after the loop will then set final_young_length using |
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596 // the value cached in the minimum length. |
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597 min_young_length = max_young_length; |
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598 } else { |
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599 // The maximum possible number of young regions will not fit within |
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600 // the target pause time so let's search.... |
342 | 601 |
602 size_t diff = (max_young_length - min_young_length) / 2; | |
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603 max_young_length = min_young_length + diff; |
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604 |
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605 while (max_young_length > min_young_length) { |
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606 if (predict_will_fit(max_young_length, base_time_ms, |
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607 init_free_regions, target_pause_time_ms)) { |
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608 |
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609 // The current max young length will fit within the target |
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610 // pause time. Note we do not exit the loop here. By setting |
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611 // min = max, and then increasing the max below means that |
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612 // we will continue searching for an upper bound in the |
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613 // range [max..max+diff] |
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614 min_young_length = max_young_length; |
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615 } |
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616 diff = (max_young_length - min_young_length) / 2; |
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617 max_young_length = min_young_length + diff; |
342 | 618 } |
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619 // the above loop found a maximal young length that will fit |
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620 // within the target pause time. |
342 | 621 } |
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622 assert(min_young_length <= abs_max_young_length, "just checking"); |
342 | 623 } |
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624 final_young_length = min_young_length; |
342 | 625 } |
626 } | |
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627 // and we're done! |
342 | 628 |
629 // we should have at least one region in the target young length | |
545 | 630 _young_list_target_length = |
1973 | 631 final_young_length + _recorded_survivor_regions; |
342 | 632 |
633 // let's keep an eye of how long we spend on this calculation | |
634 // right now, I assume that we'll print it when we need it; we | |
635 // should really adde it to the breakdown of a pause | |
636 double end_time_sec = os::elapsedTime(); | |
637 double elapsed_time_ms = (end_time_sec - start_time_sec) * 1000.0; | |
638 | |
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639 #ifdef TRACE_CALC_YOUNG_LENGTH |
342 | 640 // leave this in for debugging, just in case |
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641 gclog_or_tty->print_cr("target = %1.1lf ms, young = " SIZE_FORMAT ", " |
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642 "elapsed %1.2lf ms, (%s%s) " SIZE_FORMAT SIZE_FORMAT, |
342 | 643 target_pause_time_ms, |
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644 _young_list_target_length |
342 | 645 elapsed_time_ms, |
646 full_young_gcs() ? "full" : "partial", | |
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647 during_initial_mark_pause() ? " i-m" : "", |
545 | 648 _in_marking_window, |
649 _in_marking_window_im); | |
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650 #endif // TRACE_CALC_YOUNG_LENGTH |
342 | 651 |
652 if (_young_list_target_length < _young_list_min_length) { | |
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653 // bummer; this means that, if we do a pause when the maximal |
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654 // length dictates, we'll violate the pause spacing target (the |
342 | 655 // min length was calculate based on the application's current |
656 // alloc rate); | |
657 | |
658 // so, we have to bite the bullet, and allocate the minimum | |
659 // number. We'll violate our target, but we just can't meet it. | |
660 | |
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661 #ifdef TRACE_CALC_YOUNG_LENGTH |
342 | 662 // leave this in for debugging, just in case |
663 gclog_or_tty->print_cr("adjusted target length from " | |
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664 SIZE_FORMAT " to " SIZE_FORMAT, |
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665 _young_list_target_length, _young_list_min_length); |
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666 #endif // TRACE_CALC_YOUNG_LENGTH |
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667 |
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668 _young_list_target_length = _young_list_min_length; |
342 | 669 } |
670 } else { | |
671 // we are in a partially-young mode or we've run out of regions (due | |
672 // to evacuation failure) | |
673 | |
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674 #ifdef TRACE_CALC_YOUNG_LENGTH |
342 | 675 // leave this in for debugging, just in case |
676 gclog_or_tty->print_cr("(partial) setting target to " SIZE_FORMAT | |
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677 _young_list_min_length); |
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678 #endif // TRACE_CALC_YOUNG_LENGTH |
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679 // we'll do the pause as soon as possible by choosing the minimum |
1973 | 680 _young_list_target_length = _young_list_min_length; |
342 | 681 } |
682 | |
683 _rs_lengths_prediction = rs_lengths; | |
684 } | |
685 | |
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686 // This is used by: calculate_young_list_target_length(rs_length). It |
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687 // returns true iff: |
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688 // the predicted pause time for the given young list will not overflow |
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689 // the target pause time |
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690 // and: |
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691 // the predicted amount of surviving data will not overflow the |
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692 // the amount of free space available for survivor regions. |
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693 // |
342 | 694 bool |
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695 G1CollectorPolicy::predict_will_fit(size_t young_length, |
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696 double base_time_ms, |
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697 size_t init_free_regions, |
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698 double target_pause_time_ms) { |
342 | 699 |
700 if (young_length >= init_free_regions) | |
701 // end condition 1: not enough space for the young regions | |
702 return false; | |
703 | |
704 double accum_surv_rate_adj = 0.0; | |
705 double accum_surv_rate = | |
706 accum_yg_surv_rate_pred((int)(young_length - 1)) - accum_surv_rate_adj; | |
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707 |
342 | 708 size_t bytes_to_copy = |
709 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); | |
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710 |
342 | 711 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
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712 |
342 | 713 double young_other_time_ms = |
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714 predict_young_other_time_ms(young_length); |
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715 |
342 | 716 double pause_time_ms = |
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717 base_time_ms + copy_time_ms + young_other_time_ms; |
342 | 718 |
719 if (pause_time_ms > target_pause_time_ms) | |
720 // end condition 2: over the target pause time | |
721 return false; | |
722 | |
723 size_t free_bytes = | |
724 (init_free_regions - young_length) * HeapRegion::GrainBytes; | |
725 | |
726 if ((2.0 + sigma()) * (double) bytes_to_copy > (double) free_bytes) | |
727 // end condition 3: out of to-space (conservatively) | |
728 return false; | |
729 | |
730 // success! | |
731 return true; | |
732 } | |
733 | |
545 | 734 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
735 double survivor_regions_evac_time = 0.0; | |
736 for (HeapRegion * r = _recorded_survivor_head; | |
737 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
738 r = r->get_next_young_region()) { | |
739 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); | |
740 } | |
741 return survivor_regions_evac_time; | |
742 } | |
743 | |
342 | 744 void G1CollectorPolicy::check_prediction_validity() { |
745 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); | |
746 | |
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747 size_t rs_lengths = _g1->young_list()->sampled_rs_lengths(); |
342 | 748 if (rs_lengths > _rs_lengths_prediction) { |
749 // add 10% to avoid having to recalculate often | |
750 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
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751 calculate_young_list_target_length(rs_lengths_prediction); |
342 | 752 } |
753 } | |
754 | |
755 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, | |
756 bool is_tlab, | |
757 bool* gc_overhead_limit_was_exceeded) { | |
758 guarantee(false, "Not using this policy feature yet."); | |
759 return NULL; | |
760 } | |
761 | |
762 // This method controls how a collector handles one or more | |
763 // of its generations being fully allocated. | |
764 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
765 bool is_tlab) { | |
766 guarantee(false, "Not using this policy feature yet."); | |
767 return NULL; | |
768 } | |
769 | |
770 | |
771 #ifndef PRODUCT | |
772 bool G1CollectorPolicy::verify_young_ages() { | |
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773 HeapRegion* head = _g1->young_list()->first_region(); |
342 | 774 return |
775 verify_young_ages(head, _short_lived_surv_rate_group); | |
776 // also call verify_young_ages on any additional surv rate groups | |
777 } | |
778 | |
779 bool | |
780 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
781 SurvRateGroup *surv_rate_group) { | |
782 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
783 | |
784 const char* name = surv_rate_group->name(); | |
785 bool ret = true; | |
786 int prev_age = -1; | |
787 | |
788 for (HeapRegion* curr = head; | |
789 curr != NULL; | |
790 curr = curr->get_next_young_region()) { | |
791 SurvRateGroup* group = curr->surv_rate_group(); | |
792 if (group == NULL && !curr->is_survivor()) { | |
793 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
794 ret = false; | |
795 } | |
796 | |
797 if (surv_rate_group == group) { | |
798 int age = curr->age_in_surv_rate_group(); | |
799 | |
800 if (age < 0) { | |
801 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
802 ret = false; | |
803 } | |
804 | |
805 if (age <= prev_age) { | |
806 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
807 "(%d, %d)", name, age, prev_age); | |
808 ret = false; | |
809 } | |
810 prev_age = age; | |
811 } | |
812 } | |
813 | |
814 return ret; | |
815 } | |
816 #endif // PRODUCT | |
817 | |
818 void G1CollectorPolicy::record_full_collection_start() { | |
819 _cur_collection_start_sec = os::elapsedTime(); | |
820 // Release the future to-space so that it is available for compaction into. | |
821 _g1->set_full_collection(); | |
822 } | |
823 | |
824 void G1CollectorPolicy::record_full_collection_end() { | |
825 // Consider this like a collection pause for the purposes of allocation | |
826 // since last pause. | |
827 double end_sec = os::elapsedTime(); | |
828 double full_gc_time_sec = end_sec - _cur_collection_start_sec; | |
829 double full_gc_time_ms = full_gc_time_sec * 1000.0; | |
830 | |
831 _all_full_gc_times_ms->add(full_gc_time_ms); | |
832 | |
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833 update_recent_gc_times(end_sec, full_gc_time_ms); |
342 | 834 |
835 _g1->clear_full_collection(); | |
836 | |
837 // "Nuke" the heuristics that control the fully/partially young GC | |
838 // transitions and make sure we start with fully young GCs after the | |
839 // Full GC. | |
840 set_full_young_gcs(true); | |
841 _last_full_young_gc = false; | |
842 _should_revert_to_full_young_gcs = false; | |
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843 clear_initiate_conc_mark_if_possible(); |
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844 clear_during_initial_mark_pause(); |
342 | 845 _known_garbage_bytes = 0; |
846 _known_garbage_ratio = 0.0; | |
847 _in_marking_window = false; | |
848 _in_marking_window_im = false; | |
849 | |
850 _short_lived_surv_rate_group->start_adding_regions(); | |
851 // also call this on any additional surv rate groups | |
852 | |
545 | 853 record_survivor_regions(0, NULL, NULL); |
854 | |
342 | 855 _prev_region_num_young = _region_num_young; |
856 _prev_region_num_tenured = _region_num_tenured; | |
857 | |
858 _free_regions_at_end_of_collection = _g1->free_regions(); | |
545 | 859 // Reset survivors SurvRateGroup. |
860 _survivor_surv_rate_group->reset(); | |
342 | 861 calculate_young_list_min_length(); |
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862 calculate_young_list_target_length(); |
1973 | 863 } |
342 | 864 |
865 void G1CollectorPolicy::record_before_bytes(size_t bytes) { | |
866 _bytes_in_to_space_before_gc += bytes; | |
867 } | |
868 | |
869 void G1CollectorPolicy::record_after_bytes(size_t bytes) { | |
870 _bytes_in_to_space_after_gc += bytes; | |
871 } | |
872 | |
873 void G1CollectorPolicy::record_stop_world_start() { | |
874 _stop_world_start = os::elapsedTime(); | |
875 } | |
876 | |
877 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, | |
878 size_t start_used) { | |
879 if (PrintGCDetails) { | |
880 gclog_or_tty->stamp(PrintGCTimeStamps); | |
881 gclog_or_tty->print("[GC pause"); | |
882 if (in_young_gc_mode()) | |
883 gclog_or_tty->print(" (%s)", full_young_gcs() ? "young" : "partial"); | |
884 } | |
885 | |
1973 | 886 assert(_g1->used() == _g1->recalculate_used(), |
887 err_msg("sanity, used: "SIZE_FORMAT" recalculate_used: "SIZE_FORMAT, | |
888 _g1->used(), _g1->recalculate_used())); | |
342 | 889 |
890 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
891 _all_stop_world_times_ms->add(s_w_t_ms); | |
892 _stop_world_start = 0.0; | |
893 | |
894 _cur_collection_start_sec = start_time_sec; | |
895 _cur_collection_pause_used_at_start_bytes = start_used; | |
896 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); | |
897 _pending_cards = _g1->pending_card_num(); | |
898 _max_pending_cards = _g1->max_pending_card_num(); | |
899 | |
900 _bytes_in_to_space_before_gc = 0; | |
901 _bytes_in_to_space_after_gc = 0; | |
902 _bytes_in_collection_set_before_gc = 0; | |
903 | |
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904 YoungList* young_list = _g1->young_list(); |
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905 _eden_bytes_before_gc = young_list->eden_used_bytes(); |
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906 _survivor_bytes_before_gc = young_list->survivor_used_bytes(); |
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907 _capacity_before_gc = _g1->capacity(); |
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908 |
342 | 909 #ifdef DEBUG |
910 // initialise these to something well known so that we can spot | |
911 // if they are not set properly | |
912 | |
913 for (int i = 0; i < _parallel_gc_threads; ++i) { | |
1611 | 914 _par_last_gc_worker_start_times_ms[i] = -1234.0; |
915 _par_last_ext_root_scan_times_ms[i] = -1234.0; | |
916 _par_last_mark_stack_scan_times_ms[i] = -1234.0; | |
917 _par_last_update_rs_times_ms[i] = -1234.0; | |
918 _par_last_update_rs_processed_buffers[i] = -1234.0; | |
919 _par_last_scan_rs_times_ms[i] = -1234.0; | |
920 _par_last_obj_copy_times_ms[i] = -1234.0; | |
921 _par_last_termination_times_ms[i] = -1234.0; | |
922 _par_last_termination_attempts[i] = -1234.0; | |
923 _par_last_gc_worker_end_times_ms[i] = -1234.0; | |
2430 | 924 _par_last_gc_worker_times_ms[i] = -1234.0; |
342 | 925 } |
926 #endif | |
927 | |
928 for (int i = 0; i < _aux_num; ++i) { | |
929 _cur_aux_times_ms[i] = 0.0; | |
930 _cur_aux_times_set[i] = false; | |
931 } | |
932 | |
933 _satb_drain_time_set = false; | |
934 _last_satb_drain_processed_buffers = -1; | |
935 | |
936 if (in_young_gc_mode()) | |
937 _last_young_gc_full = false; | |
938 | |
939 // do that for any other surv rate groups | |
940 _short_lived_surv_rate_group->stop_adding_regions(); | |
1282 | 941 _survivors_age_table.clear(); |
545 | 942 |
342 | 943 assert( verify_young_ages(), "region age verification" ); |
944 } | |
945 | |
946 void G1CollectorPolicy::record_mark_closure_time(double mark_closure_time_ms) { | |
947 _mark_closure_time_ms = mark_closure_time_ms; | |
948 } | |
949 | |
950 void G1CollectorPolicy::record_concurrent_mark_init_start() { | |
951 _mark_init_start_sec = os::elapsedTime(); | |
952 guarantee(!in_young_gc_mode(), "should not do be here in young GC mode"); | |
953 } | |
954 | |
955 void G1CollectorPolicy::record_concurrent_mark_init_end_pre(double | |
956 mark_init_elapsed_time_ms) { | |
957 _during_marking = true; | |
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958 assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
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959 clear_during_initial_mark_pause(); |
342 | 960 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
961 } | |
962 | |
963 void G1CollectorPolicy::record_concurrent_mark_init_end() { | |
964 double end_time_sec = os::elapsedTime(); | |
965 double elapsed_time_ms = (end_time_sec - _mark_init_start_sec) * 1000.0; | |
966 _concurrent_mark_init_times_ms->add(elapsed_time_ms); | |
967 record_concurrent_mark_init_end_pre(elapsed_time_ms); | |
968 | |
969 _mmu_tracker->add_pause(_mark_init_start_sec, end_time_sec, true); | |
970 } | |
971 | |
972 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
973 _mark_remark_start_sec = os::elapsedTime(); | |
974 _during_marking = false; | |
975 } | |
976 | |
977 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
978 double end_time_sec = os::elapsedTime(); | |
979 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
980 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
981 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
982 _prev_collection_pause_end_ms += elapsed_time_ms; | |
983 | |
984 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
985 } | |
986 | |
987 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
988 _mark_cleanup_start_sec = os::elapsedTime(); | |
989 } | |
990 | |
991 void | |
992 G1CollectorPolicy::record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
993 size_t max_live_bytes) { | |
994 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
995 record_concurrent_mark_cleanup_end_work2(); | |
996 } | |
997 | |
998 void | |
999 G1CollectorPolicy:: | |
1000 record_concurrent_mark_cleanup_end_work1(size_t freed_bytes, | |
1001 size_t max_live_bytes) { | |
1002 if (_n_marks < 2) _n_marks++; | |
1003 if (G1PolicyVerbose > 0) | |
1004 gclog_or_tty->print_cr("At end of marking, max_live is " SIZE_FORMAT " MB " | |
1005 " (of " SIZE_FORMAT " MB heap).", | |
1006 max_live_bytes/M, _g1->capacity()/M); | |
1007 } | |
1008 | |
1009 // The important thing about this is that it includes "os::elapsedTime". | |
1010 void G1CollectorPolicy::record_concurrent_mark_cleanup_end_work2() { | |
1011 double end_time_sec = os::elapsedTime(); | |
1012 double elapsed_time_ms = (end_time_sec - _mark_cleanup_start_sec)*1000.0; | |
1013 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
1014 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
1015 _prev_collection_pause_end_ms += elapsed_time_ms; | |
1016 | |
1017 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_time_sec, true); | |
1018 | |
1019 _num_markings++; | |
1020 | |
1021 // We did a marking, so reset the "since_last_mark" variables. | |
1022 double considerConcMarkCost = 1.0; | |
1023 // If there are available processors, concurrent activity is free... | |
1024 if (Threads::number_of_non_daemon_threads() * 2 < | |
1025 os::active_processor_count()) { | |
1026 considerConcMarkCost = 0.0; | |
1027 } | |
1028 _n_pauses_at_mark_end = _n_pauses; | |
1029 _n_marks_since_last_pause++; | |
1030 } | |
1031 | |
1032 void | |
1033 G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { | |
1034 if (in_young_gc_mode()) { | |
1035 _should_revert_to_full_young_gcs = false; | |
1036 _last_full_young_gc = true; | |
1037 _in_marking_window = false; | |
1038 if (adaptive_young_list_length()) | |
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1039 calculate_young_list_target_length(); |
342 | 1040 } |
1041 } | |
1042 | |
1043 void G1CollectorPolicy::record_concurrent_pause() { | |
1044 if (_stop_world_start > 0.0) { | |
1045 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
1046 _all_yield_times_ms->add(yield_ms); | |
1047 } | |
1048 } | |
1049 | |
1050 void G1CollectorPolicy::record_concurrent_pause_end() { | |
1051 } | |
1052 | |
1053 void G1CollectorPolicy::record_collection_pause_end_CH_strong_roots() { | |
1054 _cur_CH_strong_roots_end_sec = os::elapsedTime(); | |
1055 _cur_CH_strong_roots_dur_ms = | |
1056 (_cur_CH_strong_roots_end_sec - _cur_collection_start_sec) * 1000.0; | |
1057 } | |
1058 | |
1059 void G1CollectorPolicy::record_collection_pause_end_G1_strong_roots() { | |
1060 _cur_G1_strong_roots_end_sec = os::elapsedTime(); | |
1061 _cur_G1_strong_roots_dur_ms = | |
1062 (_cur_G1_strong_roots_end_sec - _cur_CH_strong_roots_end_sec) * 1000.0; | |
1063 } | |
1064 | |
1065 template<class T> | |
1066 T sum_of(T* sum_arr, int start, int n, int N) { | |
1067 T sum = (T)0; | |
1068 for (int i = 0; i < n; i++) { | |
1069 int j = (start + i) % N; | |
1070 sum += sum_arr[j]; | |
1071 } | |
1072 return sum; | |
1073 } | |
1074 | |
1611 | 1075 void G1CollectorPolicy::print_par_stats(int level, |
1076 const char* str, | |
2430 | 1077 double* data) { |
342 | 1078 double min = data[0], max = data[0]; |
1079 double total = 0.0; | |
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1080 LineBuffer buf(level); |
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1081 buf.append("[%s (ms):", str); |
342 | 1082 for (uint i = 0; i < ParallelGCThreads; ++i) { |
1083 double val = data[i]; | |
1084 if (val < min) | |
1085 min = val; | |
1086 if (val > max) | |
1087 max = val; | |
1088 total += val; | |
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1089 buf.append(" %3.1lf", val); |
342 | 1090 } |
2430 | 1091 buf.append_and_print_cr(""); |
1092 double avg = total / (double) ParallelGCThreads; | |
1093 buf.append_and_print_cr(" Avg: %5.1lf, Min: %5.1lf, Max: %5.1lf, Diff: %5.1lf]", | |
1094 avg, min, max, max - min); | |
342 | 1095 } |
1096 | |
1611 | 1097 void G1CollectorPolicy::print_par_sizes(int level, |
1098 const char* str, | |
2430 | 1099 double* data) { |
342 | 1100 double min = data[0], max = data[0]; |
1101 double total = 0.0; | |
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1102 LineBuffer buf(level); |
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1103 buf.append("[%s :", str); |
342 | 1104 for (uint i = 0; i < ParallelGCThreads; ++i) { |
1105 double val = data[i]; | |
1106 if (val < min) | |
1107 min = val; | |
1108 if (val > max) | |
1109 max = val; | |
1110 total += val; | |
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1111 buf.append(" %d", (int) val); |
342 | 1112 } |
2430 | 1113 buf.append_and_print_cr(""); |
1114 double avg = total / (double) ParallelGCThreads; | |
1115 buf.append_and_print_cr(" Sum: %d, Avg: %d, Min: %d, Max: %d, Diff: %d]", | |
1116 (int)total, (int)avg, (int)min, (int)max, (int)max - (int)min); | |
342 | 1117 } |
1118 | |
1119 void G1CollectorPolicy::print_stats (int level, | |
1120 const char* str, | |
1121 double value) { | |
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1122 LineBuffer(level).append_and_print_cr("[%s: %5.1lf ms]", str, value); |
342 | 1123 } |
1124 | |
1125 void G1CollectorPolicy::print_stats (int level, | |
1126 const char* str, | |
1127 int value) { | |
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1128 LineBuffer(level).append_and_print_cr("[%s: %d]", str, value); |
342 | 1129 } |
1130 | |
1131 double G1CollectorPolicy::avg_value (double* data) { | |
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1132 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1133 double ret = 0.0; |
1134 for (uint i = 0; i < ParallelGCThreads; ++i) | |
1135 ret += data[i]; | |
1136 return ret / (double) ParallelGCThreads; | |
1137 } else { | |
1138 return data[0]; | |
1139 } | |
1140 } | |
1141 | |
1142 double G1CollectorPolicy::max_value (double* data) { | |
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1143 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1144 double ret = data[0]; |
1145 for (uint i = 1; i < ParallelGCThreads; ++i) | |
1146 if (data[i] > ret) | |
1147 ret = data[i]; | |
1148 return ret; | |
1149 } else { | |
1150 return data[0]; | |
1151 } | |
1152 } | |
1153 | |
1154 double G1CollectorPolicy::sum_of_values (double* data) { | |
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1155 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1156 double sum = 0.0; |
1157 for (uint i = 0; i < ParallelGCThreads; i++) | |
1158 sum += data[i]; | |
1159 return sum; | |
1160 } else { | |
1161 return data[0]; | |
1162 } | |
1163 } | |
1164 | |
1165 double G1CollectorPolicy::max_sum (double* data1, | |
1166 double* data2) { | |
1167 double ret = data1[0] + data2[0]; | |
1168 | |
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1169 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1170 for (uint i = 1; i < ParallelGCThreads; ++i) { |
1171 double data = data1[i] + data2[i]; | |
1172 if (data > ret) | |
1173 ret = data; | |
1174 } | |
1175 } | |
1176 return ret; | |
1177 } | |
1178 | |
1179 // Anything below that is considered to be zero | |
1180 #define MIN_TIMER_GRANULARITY 0.0000001 | |
1181 | |
1707 | 1182 void G1CollectorPolicy::record_collection_pause_end() { |
342 | 1183 double end_time_sec = os::elapsedTime(); |
1184 double elapsed_ms = _last_pause_time_ms; | |
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1185 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
342 | 1186 double evac_ms = (end_time_sec - _cur_G1_strong_roots_end_sec) * 1000.0; |
1187 size_t rs_size = | |
1188 _cur_collection_pause_used_regions_at_start - collection_set_size(); | |
1189 size_t cur_used_bytes = _g1->used(); | |
1190 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
1191 bool last_pause_included_initial_mark = false; | |
1707 | 1192 bool update_stats = !_g1->evacuation_failed(); |
342 | 1193 |
1194 #ifndef PRODUCT | |
1195 if (G1YoungSurvRateVerbose) { | |
1196 gclog_or_tty->print_cr(""); | |
1197 _short_lived_surv_rate_group->print(); | |
1198 // do that for any other surv rate groups too | |
1199 } | |
1200 #endif // PRODUCT | |
1201 | |
1202 if (in_young_gc_mode()) { | |
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1203 last_pause_included_initial_mark = during_initial_mark_pause(); |
342 | 1204 if (last_pause_included_initial_mark) |
1205 record_concurrent_mark_init_end_pre(0.0); | |
1206 | |
1207 size_t min_used_targ = | |
1283
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1208 (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
342 | 1209 |
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1210 |
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1211 if (!_g1->mark_in_progress() && !_last_full_young_gc) { |
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1212 assert(!last_pause_included_initial_mark, "invariant"); |
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1213 if (cur_used_bytes > min_used_targ && |
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1214 cur_used_bytes > _prev_collection_pause_used_at_end_bytes) { |
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1215 assert(!during_initial_mark_pause(), "we should not see this here"); |
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1216 |
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1217 // Note: this might have already been set, if during the last |
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1218 // pause we decided to start a cycle but at the beginning of |
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1219 // this pause we decided to postpone it. That's OK. |
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1220 set_initiate_conc_mark_if_possible(); |
342 | 1221 } |
1222 } | |
1223 | |
1224 _prev_collection_pause_used_at_end_bytes = cur_used_bytes; | |
1225 } | |
1226 | |
1227 _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0, | |
1228 end_time_sec, false); | |
1229 | |
1230 guarantee(_cur_collection_pause_used_regions_at_start >= | |
1231 collection_set_size(), | |
1232 "Negative RS size?"); | |
1233 | |
1234 // This assert is exempted when we're doing parallel collection pauses, | |
1235 // because the fragmentation caused by the parallel GC allocation buffers | |
1236 // can lead to more memory being used during collection than was used | |
1237 // before. Best leave this out until the fragmentation problem is fixed. | |
1238 // Pauses in which evacuation failed can also lead to negative | |
1239 // collections, since no space is reclaimed from a region containing an | |
1240 // object whose evacuation failed. | |
1241 // Further, we're now always doing parallel collection. But I'm still | |
1242 // leaving this here as a placeholder for a more precise assertion later. | |
1243 // (DLD, 10/05.) | |
1244 assert((true || parallel) // Always using GC LABs now. | |
1245 || _g1->evacuation_failed() | |
1246 || _cur_collection_pause_used_at_start_bytes >= cur_used_bytes, | |
1247 "Negative collection"); | |
1248 | |
1249 size_t freed_bytes = | |
1250 _cur_collection_pause_used_at_start_bytes - cur_used_bytes; | |
1251 size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; | |
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1252 |
342 | 1253 double survival_fraction = |
1254 (double)surviving_bytes/ | |
1255 (double)_collection_set_bytes_used_before; | |
1256 | |
1257 _n_pauses++; | |
1258 | |
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1259 if (update_stats) { |
342 | 1260 _recent_CH_strong_roots_times_ms->add(_cur_CH_strong_roots_dur_ms); |
1261 _recent_G1_strong_roots_times_ms->add(_cur_G1_strong_roots_dur_ms); | |
1262 _recent_evac_times_ms->add(evac_ms); | |
1263 _recent_pause_times_ms->add(elapsed_ms); | |
1264 | |
1265 _recent_rs_sizes->add(rs_size); | |
1266 | |
1267 // We exempt parallel collection from this check because Alloc Buffer | |
1268 // fragmentation can produce negative collections. Same with evac | |
1269 // failure. | |
1270 // Further, we're now always doing parallel collection. But I'm still | |
1271 // leaving this here as a placeholder for a more precise assertion later. | |
1272 // (DLD, 10/05. | |
1273 assert((true || parallel) | |
1274 || _g1->evacuation_failed() | |
1275 || surviving_bytes <= _collection_set_bytes_used_before, | |
1276 "Or else negative collection!"); | |
1277 _recent_CS_bytes_used_before->add(_collection_set_bytes_used_before); | |
1278 _recent_CS_bytes_surviving->add(surviving_bytes); | |
1279 | |
1280 // this is where we update the allocation rate of the application | |
1281 double app_time_ms = | |
1282 (_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms); | |
1283 if (app_time_ms < MIN_TIMER_GRANULARITY) { | |
1284 // This usually happens due to the timer not having the required | |
1285 // granularity. Some Linuxes are the usual culprits. | |
1286 // We'll just set it to something (arbitrarily) small. | |
1287 app_time_ms = 1.0; | |
1288 } | |
1289 size_t regions_allocated = | |
1290 (_region_num_young - _prev_region_num_young) + | |
1291 (_region_num_tenured - _prev_region_num_tenured); | |
1292 double alloc_rate_ms = (double) regions_allocated / app_time_ms; | |
1293 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
1294 _prev_region_num_young = _region_num_young; | |
1295 _prev_region_num_tenured = _region_num_tenured; | |
1296 | |
1297 double interval_ms = | |
1298 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
1299 update_recent_gc_times(end_time_sec, elapsed_ms); | |
1300 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; | |
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1301 if (recent_avg_pause_time_ratio() < 0.0 || |
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1302 (recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
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1303 #ifndef PRODUCT |
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1304 // Dump info to allow post-facto debugging |
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1305 gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
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1306 gclog_or_tty->print_cr("-------------------------------------------"); |
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1307 gclog_or_tty->print_cr("Recent GC Times (ms):"); |
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1308 _recent_gc_times_ms->dump(); |
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1309 gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
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1310 _recent_prev_end_times_for_all_gcs_sec->dump(); |
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1311 gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
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1312 _recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
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1313 // In debug mode, terminate the JVM if the user wants to debug at this point. |
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1314 assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
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1315 #endif // !PRODUCT |
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1316 // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
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1317 // CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
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1318 if (_recent_avg_pause_time_ratio < 0.0) { |
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1319 _recent_avg_pause_time_ratio = 0.0; |
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1320 } else { |
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1321 assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
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1322 _recent_avg_pause_time_ratio = 1.0; |
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1323 } |
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1324 } |
342 | 1325 } |
1326 | |
1327 if (G1PolicyVerbose > 1) { | |
1328 gclog_or_tty->print_cr(" Recording collection pause(%d)", _n_pauses); | |
1329 } | |
1330 | |
1707 | 1331 PauseSummary* summary = _summary; |
342 | 1332 |
1333 double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); | |
1334 double mark_stack_scan_time = avg_value(_par_last_mark_stack_scan_times_ms); | |
1335 double update_rs_time = avg_value(_par_last_update_rs_times_ms); | |
1336 double update_rs_processed_buffers = | |
1337 sum_of_values(_par_last_update_rs_processed_buffers); | |
1338 double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); | |
1339 double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); | |
1340 double termination_time = avg_value(_par_last_termination_times_ms); | |
1341 | |
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1342 double parallel_other_time = _cur_collection_par_time_ms - |
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1343 (update_rs_time + ext_root_scan_time + mark_stack_scan_time + |
1394
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1344 scan_rs_time + obj_copy_time + termination_time); |
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1345 if (update_stats) { |
342 | 1346 MainBodySummary* body_summary = summary->main_body_summary(); |
1347 guarantee(body_summary != NULL, "should not be null!"); | |
1348 | |
1349 if (_satb_drain_time_set) | |
1350 body_summary->record_satb_drain_time_ms(_cur_satb_drain_time_ms); | |
1351 else | |
1352 body_summary->record_satb_drain_time_ms(0.0); | |
1353 body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); | |
1354 body_summary->record_mark_stack_scan_time_ms(mark_stack_scan_time); | |
1355 body_summary->record_update_rs_time_ms(update_rs_time); | |
1356 body_summary->record_scan_rs_time_ms(scan_rs_time); | |
1357 body_summary->record_obj_copy_time_ms(obj_copy_time); | |
1358 if (parallel) { | |
1359 body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); | |
1360 body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); | |
1361 body_summary->record_termination_time_ms(termination_time); | |
1362 body_summary->record_parallel_other_time_ms(parallel_other_time); | |
1363 } | |
1364 body_summary->record_mark_closure_time_ms(_mark_closure_time_ms); | |
1365 } | |
1366 | |
1367 if (G1PolicyVerbose > 1) { | |
1368 gclog_or_tty->print_cr(" ET: %10.6f ms (avg: %10.6f ms)\n" | |
1369 " CH Strong: %10.6f ms (avg: %10.6f ms)\n" | |
1370 " G1 Strong: %10.6f ms (avg: %10.6f ms)\n" | |
1371 " Evac: %10.6f ms (avg: %10.6f ms)\n" | |
1372 " ET-RS: %10.6f ms (avg: %10.6f ms)\n" | |
1373 " |RS|: " SIZE_FORMAT, | |
1374 elapsed_ms, recent_avg_time_for_pauses_ms(), | |
1375 _cur_CH_strong_roots_dur_ms, recent_avg_time_for_CH_strong_ms(), | |
1376 _cur_G1_strong_roots_dur_ms, recent_avg_time_for_G1_strong_ms(), | |
1377 evac_ms, recent_avg_time_for_evac_ms(), | |
1378 scan_rs_time, | |
1379 recent_avg_time_for_pauses_ms() - | |
1380 recent_avg_time_for_G1_strong_ms(), | |
1381 rs_size); | |
1382 | |
1383 gclog_or_tty->print_cr(" Used at start: " SIZE_FORMAT"K" | |
1384 " At end " SIZE_FORMAT "K\n" | |
1385 " garbage : " SIZE_FORMAT "K" | |
1386 " of " SIZE_FORMAT "K\n" | |
1387 " survival : %6.2f%% (%6.2f%% avg)", | |
1388 _cur_collection_pause_used_at_start_bytes/K, | |
1389 _g1->used()/K, freed_bytes/K, | |
1390 _collection_set_bytes_used_before/K, | |
1391 survival_fraction*100.0, | |
1392 recent_avg_survival_fraction()*100.0); | |
1393 gclog_or_tty->print_cr(" Recent %% gc pause time: %6.2f", | |
1394 recent_avg_pause_time_ratio() * 100.0); | |
1395 } | |
1396 | |
1397 double other_time_ms = elapsed_ms; | |
1398 | |
1707 | 1399 if (_satb_drain_time_set) { |
1400 other_time_ms -= _cur_satb_drain_time_ms; | |
1401 } | |
1402 | |
1403 if (parallel) { | |
1404 other_time_ms -= _cur_collection_par_time_ms + _cur_clear_ct_time_ms; | |
1405 } else { | |
1406 other_time_ms -= | |
1407 update_rs_time + | |
1408 ext_root_scan_time + mark_stack_scan_time + | |
1409 scan_rs_time + obj_copy_time; | |
342 | 1410 } |
1411 | |
1412 if (PrintGCDetails) { | |
1707 | 1413 gclog_or_tty->print_cr("%s, %1.8lf secs]", |
342 | 1414 (last_pause_included_initial_mark) ? " (initial-mark)" : "", |
1415 elapsed_ms / 1000.0); | |
1416 | |
1707 | 1417 if (_satb_drain_time_set) { |
1418 print_stats(1, "SATB Drain Time", _cur_satb_drain_time_ms); | |
1419 } | |
1420 if (_last_satb_drain_processed_buffers >= 0) { | |
1421 print_stats(2, "Processed Buffers", _last_satb_drain_processed_buffers); | |
1422 } | |
1423 if (parallel) { | |
1424 print_stats(1, "Parallel Time", _cur_collection_par_time_ms); | |
2430 | 1425 print_par_stats(2, "GC Worker Start Time", _par_last_gc_worker_start_times_ms); |
1707 | 1426 print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); |
2430 | 1427 print_par_sizes(3, "Processed Buffers", _par_last_update_rs_processed_buffers); |
1428 print_par_stats(2, "Ext Root Scanning", _par_last_ext_root_scan_times_ms); | |
1429 print_par_stats(2, "Mark Stack Scanning", _par_last_mark_stack_scan_times_ms); | |
1707 | 1430 print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms); |
1431 print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms); | |
1432 print_par_stats(2, "Termination", _par_last_termination_times_ms); | |
2430 | 1433 print_par_sizes(3, "Termination Attempts", _par_last_termination_attempts); |
1434 print_par_stats(2, "GC Worker End Time", _par_last_gc_worker_end_times_ms); | |
1435 | |
1436 for (int i = 0; i < _parallel_gc_threads; i++) { | |
1437 _par_last_gc_worker_times_ms[i] = _par_last_gc_worker_end_times_ms[i] - _par_last_gc_worker_start_times_ms[i]; | |
1438 } | |
1439 print_par_stats(2, "GC Worker Times", _par_last_gc_worker_times_ms); | |
1440 | |
1707 | 1441 print_stats(2, "Other", parallel_other_time); |
1442 print_stats(1, "Clear CT", _cur_clear_ct_time_ms); | |
1443 } else { | |
1444 print_stats(1, "Update RS", update_rs_time); | |
1445 print_stats(2, "Processed Buffers", | |
1446 (int)update_rs_processed_buffers); | |
1447 print_stats(1, "Ext Root Scanning", ext_root_scan_time); | |
1448 print_stats(1, "Mark Stack Scanning", mark_stack_scan_time); | |
1449 print_stats(1, "Scan RS", scan_rs_time); | |
1450 print_stats(1, "Object Copying", obj_copy_time); | |
342 | 1451 } |
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1452 #ifndef PRODUCT |
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1453 print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms); |
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1454 print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms); |
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1455 print_stats(1, "Min Clear CC", _min_clear_cc_time_ms); |
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1456 print_stats(1, "Max Clear CC", _max_clear_cc_time_ms); |
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1457 if (_num_cc_clears > 0) { |
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1458 print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears)); |
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1459 } |
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1460 #endif |
342 | 1461 print_stats(1, "Other", other_time_ms); |
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1462 print_stats(2, "Choose CSet", _recorded_young_cset_choice_time_ms); |
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1463 |
342 | 1464 for (int i = 0; i < _aux_num; ++i) { |
1465 if (_cur_aux_times_set[i]) { | |
1466 char buffer[96]; | |
1467 sprintf(buffer, "Aux%d", i); | |
1468 print_stats(1, buffer, _cur_aux_times_ms[i]); | |
1469 } | |
1470 } | |
1471 } | |
1472 | |
1473 _all_pause_times_ms->add(elapsed_ms); | |
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1474 if (update_stats) { |
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1475 summary->record_total_time_ms(elapsed_ms); |
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1476 summary->record_other_time_ms(other_time_ms); |
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1477 } |
342 | 1478 for (int i = 0; i < _aux_num; ++i) |
1479 if (_cur_aux_times_set[i]) | |
1480 _all_aux_times_ms[i].add(_cur_aux_times_ms[i]); | |
1481 | |
1482 // Reset marks-between-pauses counter. | |
1483 _n_marks_since_last_pause = 0; | |
1484 | |
1485 // Update the efficiency-since-mark vars. | |
1486 double proc_ms = elapsed_ms * (double) _parallel_gc_threads; | |
1487 if (elapsed_ms < MIN_TIMER_GRANULARITY) { | |
1488 // This usually happens due to the timer not having the required | |
1489 // granularity. Some Linuxes are the usual culprits. | |
1490 // We'll just set it to something (arbitrarily) small. | |
1491 proc_ms = 1.0; | |
1492 } | |
1493 double cur_efficiency = (double) freed_bytes / proc_ms; | |
1494 | |
1495 bool new_in_marking_window = _in_marking_window; | |
1496 bool new_in_marking_window_im = false; | |
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1497 if (during_initial_mark_pause()) { |
342 | 1498 new_in_marking_window = true; |
1499 new_in_marking_window_im = true; | |
1500 } | |
1501 | |
1502 if (in_young_gc_mode()) { | |
1503 if (_last_full_young_gc) { | |
1504 set_full_young_gcs(false); | |
1505 _last_full_young_gc = false; | |
1506 } | |
1507 | |
1508 if ( !_last_young_gc_full ) { | |
1509 if ( _should_revert_to_full_young_gcs || | |
1510 _known_garbage_ratio < 0.05 || | |
1511 (adaptive_young_list_length() && | |
1512 (get_gc_eff_factor() * cur_efficiency < predict_young_gc_eff())) ) { | |
1513 set_full_young_gcs(true); | |
1514 } | |
1515 } | |
1516 _should_revert_to_full_young_gcs = false; | |
1517 | |
1518 if (_last_young_gc_full && !_during_marking) | |
1519 _young_gc_eff_seq->add(cur_efficiency); | |
1520 } | |
1521 | |
1522 _short_lived_surv_rate_group->start_adding_regions(); | |
1523 // do that for any other surv rate groupsx | |
1524 | |
1525 // <NEW PREDICTION> | |
1526 | |
677 | 1527 if (update_stats) { |
342 | 1528 double pause_time_ms = elapsed_ms; |
1529 | |
1530 size_t diff = 0; | |
1531 if (_max_pending_cards >= _pending_cards) | |
1532 diff = _max_pending_cards - _pending_cards; | |
1533 _pending_card_diff_seq->add((double) diff); | |
1534 | |
1535 double cost_per_card_ms = 0.0; | |
1536 if (_pending_cards > 0) { | |
1537 cost_per_card_ms = update_rs_time / (double) _pending_cards; | |
1538 _cost_per_card_ms_seq->add(cost_per_card_ms); | |
1539 } | |
1540 | |
1541 size_t cards_scanned = _g1->cards_scanned(); | |
1542 | |
1543 double cost_per_entry_ms = 0.0; | |
1544 if (cards_scanned > 10) { | |
1545 cost_per_entry_ms = scan_rs_time / (double) cards_scanned; | |
1546 if (_last_young_gc_full) | |
1547 _cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1548 else | |
1549 _partially_young_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1550 } | |
1551 | |
1552 if (_max_rs_lengths > 0) { | |
1553 double cards_per_entry_ratio = | |
1554 (double) cards_scanned / (double) _max_rs_lengths; | |
1555 if (_last_young_gc_full) | |
1556 _fully_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1557 else | |
1558 _partially_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1559 } | |
1560 | |
1561 size_t rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; | |
1562 if (rs_length_diff >= 0) | |
1563 _rs_length_diff_seq->add((double) rs_length_diff); | |
1564 | |
1565 size_t copied_bytes = surviving_bytes; | |
1566 double cost_per_byte_ms = 0.0; | |
1567 if (copied_bytes > 0) { | |
1568 cost_per_byte_ms = obj_copy_time / (double) copied_bytes; | |
1569 if (_in_marking_window) | |
1570 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); | |
1571 else | |
1572 _cost_per_byte_ms_seq->add(cost_per_byte_ms); | |
1573 } | |
1574 | |
1575 double all_other_time_ms = pause_time_ms - | |
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1576 (update_rs_time + scan_rs_time + obj_copy_time + |
342 | 1577 _mark_closure_time_ms + termination_time); |
1578 | |
1579 double young_other_time_ms = 0.0; | |
1580 if (_recorded_young_regions > 0) { | |
1581 young_other_time_ms = | |
1582 _recorded_young_cset_choice_time_ms + | |
1583 _recorded_young_free_cset_time_ms; | |
1584 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / | |
1585 (double) _recorded_young_regions); | |
1586 } | |
1587 double non_young_other_time_ms = 0.0; | |
1588 if (_recorded_non_young_regions > 0) { | |
1589 non_young_other_time_ms = | |
1590 _recorded_non_young_cset_choice_time_ms + | |
1591 _recorded_non_young_free_cset_time_ms; | |
1592 | |
1593 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
1594 (double) _recorded_non_young_regions); | |
1595 } | |
1596 | |
1597 double constant_other_time_ms = all_other_time_ms - | |
1598 (young_other_time_ms + non_young_other_time_ms); | |
1599 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
1600 | |
1601 double survival_ratio = 0.0; | |
1602 if (_bytes_in_collection_set_before_gc > 0) { | |
1603 survival_ratio = (double) bytes_in_to_space_during_gc() / | |
1604 (double) _bytes_in_collection_set_before_gc; | |
1605 } | |
1606 | |
1607 _pending_cards_seq->add((double) _pending_cards); | |
1608 _scanned_cards_seq->add((double) cards_scanned); | |
1609 _rs_lengths_seq->add((double) _max_rs_lengths); | |
1610 | |
1611 double expensive_region_limit_ms = | |
751 | 1612 (double) MaxGCPauseMillis - predict_constant_other_time_ms(); |
342 | 1613 if (expensive_region_limit_ms < 0.0) { |
1614 // this means that the other time was predicted to be longer than | |
1615 // than the max pause time | |
751 | 1616 expensive_region_limit_ms = (double) MaxGCPauseMillis; |
342 | 1617 } |
1618 _expensive_region_limit_ms = expensive_region_limit_ms; | |
1619 | |
1620 if (PREDICTIONS_VERBOSE) { | |
1621 gclog_or_tty->print_cr(""); | |
1622 gclog_or_tty->print_cr("PREDICTIONS %1.4lf %d " | |
1394
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1623 "REGIONS %d %d %d " |
342 | 1624 "PENDING_CARDS %d %d " |
1625 "CARDS_SCANNED %d %d " | |
1626 "RS_LENGTHS %d %d " | |
1627 "RS_UPDATE %1.6lf %1.6lf RS_SCAN %1.6lf %1.6lf " | |
1628 "SURVIVAL_RATIO %1.6lf %1.6lf " | |
1629 "OBJECT_COPY %1.6lf %1.6lf OTHER_CONSTANT %1.6lf %1.6lf " | |
1630 "OTHER_YOUNG %1.6lf %1.6lf " | |
1631 "OTHER_NON_YOUNG %1.6lf %1.6lf " | |
1632 "VTIME_DIFF %1.6lf TERMINATION %1.6lf " | |
1633 "ELAPSED %1.6lf %1.6lf ", | |
1634 _cur_collection_start_sec, | |
1635 (!_last_young_gc_full) ? 2 : | |
1636 (last_pause_included_initial_mark) ? 1 : 0, | |
1637 _recorded_region_num, | |
1638 _recorded_young_regions, | |
1639 _recorded_non_young_regions, | |
1640 _predicted_pending_cards, _pending_cards, | |
1641 _predicted_cards_scanned, cards_scanned, | |
1642 _predicted_rs_lengths, _max_rs_lengths, | |
1643 _predicted_rs_update_time_ms, update_rs_time, | |
1644 _predicted_rs_scan_time_ms, scan_rs_time, | |
1645 _predicted_survival_ratio, survival_ratio, | |
1646 _predicted_object_copy_time_ms, obj_copy_time, | |
1647 _predicted_constant_other_time_ms, constant_other_time_ms, | |
1648 _predicted_young_other_time_ms, young_other_time_ms, | |
1649 _predicted_non_young_other_time_ms, | |
1650 non_young_other_time_ms, | |
1651 _vtime_diff_ms, termination_time, | |
1652 _predicted_pause_time_ms, elapsed_ms); | |
1653 } | |
1654 | |
1655 if (G1PolicyVerbose > 0) { | |
1656 gclog_or_tty->print_cr("Pause Time, predicted: %1.4lfms (predicted %s), actual: %1.4lfms", | |
1657 _predicted_pause_time_ms, | |
1658 (_within_target) ? "within" : "outside", | |
1659 elapsed_ms); | |
1660 } | |
1661 | |
1662 } | |
1663 | |
1664 _in_marking_window = new_in_marking_window; | |
1665 _in_marking_window_im = new_in_marking_window_im; | |
1666 _free_regions_at_end_of_collection = _g1->free_regions(); | |
1667 calculate_young_list_min_length(); | |
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1668 calculate_young_list_target_length(); |
342 | 1669 |
1111 | 1670 // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
1282 | 1671 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
1111 | 1672 adjust_concurrent_refinement(update_rs_time, update_rs_processed_buffers, update_rs_time_goal_ms); |
342 | 1673 // </NEW PREDICTION> |
1674 } | |
1675 | |
3764
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1676 #define EXT_SIZE_FORMAT "%d%s" |
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1677 #define EXT_SIZE_PARAMS(bytes) \ |
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1678 byte_size_in_proper_unit((bytes)), \ |
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1679 proper_unit_for_byte_size((bytes)) |
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1680 |
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1681 void G1CollectorPolicy::print_heap_transition() { |
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1682 if (PrintGCDetails) { |
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1683 YoungList* young_list = _g1->young_list(); |
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1684 size_t eden_bytes = young_list->eden_used_bytes(); |
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1685 size_t survivor_bytes = young_list->survivor_used_bytes(); |
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1686 size_t used_before_gc = _cur_collection_pause_used_at_start_bytes; |
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1687 size_t used = _g1->used(); |
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1688 size_t capacity = _g1->capacity(); |
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1689 |
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1690 gclog_or_tty->print_cr( |
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1691 " [Eden: "EXT_SIZE_FORMAT"->"EXT_SIZE_FORMAT" " |
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1692 "Survivors: "EXT_SIZE_FORMAT"->"EXT_SIZE_FORMAT" " |
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1693 "Heap: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->" |
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1694 EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")]", |
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1695 EXT_SIZE_PARAMS(_eden_bytes_before_gc), |
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1696 EXT_SIZE_PARAMS(eden_bytes), |
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1697 EXT_SIZE_PARAMS(_survivor_bytes_before_gc), |
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1698 EXT_SIZE_PARAMS(survivor_bytes), |
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1699 EXT_SIZE_PARAMS(used_before_gc), |
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1700 EXT_SIZE_PARAMS(_capacity_before_gc), |
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1701 EXT_SIZE_PARAMS(used), |
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1702 EXT_SIZE_PARAMS(capacity)); |
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1703 } else if (PrintGC) { |
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1704 _g1->print_size_transition(gclog_or_tty, |
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1705 _cur_collection_pause_used_at_start_bytes, |
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1706 _g1->used(), _g1->capacity()); |
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1707 } |
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1708 } |
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1709 |
342 | 1710 // <NEW PREDICTION> |
1711 | |
1111 | 1712 void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
1713 double update_rs_processed_buffers, | |
1714 double goal_ms) { | |
1715 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
1716 ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); | |
1717 | |
1282 | 1718 if (G1UseAdaptiveConcRefinement) { |
1111 | 1719 const int k_gy = 3, k_gr = 6; |
1720 const double inc_k = 1.1, dec_k = 0.9; | |
1721 | |
1722 int g = cg1r->green_zone(); | |
1723 if (update_rs_time > goal_ms) { | |
1724 g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. | |
1725 } else { | |
1726 if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { | |
1727 g = (int)MAX2(g * inc_k, g + 1.0); | |
1728 } | |
1729 } | |
1730 // Change the refinement threads params | |
1731 cg1r->set_green_zone(g); | |
1732 cg1r->set_yellow_zone(g * k_gy); | |
1733 cg1r->set_red_zone(g * k_gr); | |
1734 cg1r->reinitialize_threads(); | |
1735 | |
1736 int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); | |
1737 int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, | |
1738 cg1r->yellow_zone()); | |
1739 // Change the barrier params | |
1740 dcqs.set_process_completed_threshold(processing_threshold); | |
1741 dcqs.set_max_completed_queue(cg1r->red_zone()); | |
1742 } | |
1743 | |
1744 int curr_queue_size = dcqs.completed_buffers_num(); | |
1745 if (curr_queue_size >= cg1r->yellow_zone()) { | |
1746 dcqs.set_completed_queue_padding(curr_queue_size); | |
1747 } else { | |
1748 dcqs.set_completed_queue_padding(0); | |
1749 } | |
1750 dcqs.notify_if_necessary(); | |
1751 } | |
1752 | |
342 | 1753 double |
1754 G1CollectorPolicy:: | |
1755 predict_young_collection_elapsed_time_ms(size_t adjustment) { | |
1756 guarantee( adjustment == 0 || adjustment == 1, "invariant" ); | |
1757 | |
1758 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
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1759 size_t young_num = g1h->young_list()->length(); |
342 | 1760 if (young_num == 0) |
1761 return 0.0; | |
1762 | |
1763 young_num += adjustment; | |
1764 size_t pending_cards = predict_pending_cards(); | |
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1765 size_t rs_lengths = g1h->young_list()->sampled_rs_lengths() + |
342 | 1766 predict_rs_length_diff(); |
1767 size_t card_num; | |
1768 if (full_young_gcs()) | |
1769 card_num = predict_young_card_num(rs_lengths); | |
1770 else | |
1771 card_num = predict_non_young_card_num(rs_lengths); | |
1772 size_t young_byte_size = young_num * HeapRegion::GrainBytes; | |
1773 double accum_yg_surv_rate = | |
1774 _short_lived_surv_rate_group->accum_surv_rate(adjustment); | |
1775 | |
1776 size_t bytes_to_copy = | |
1777 (size_t) (accum_yg_surv_rate * (double) HeapRegion::GrainBytes); | |
1778 | |
1779 return | |
1780 predict_rs_update_time_ms(pending_cards) + | |
1781 predict_rs_scan_time_ms(card_num) + | |
1782 predict_object_copy_time_ms(bytes_to_copy) + | |
1783 predict_young_other_time_ms(young_num) + | |
1784 predict_constant_other_time_ms(); | |
1785 } | |
1786 | |
1787 double | |
1788 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { | |
1789 size_t rs_length = predict_rs_length_diff(); | |
1790 size_t card_num; | |
1791 if (full_young_gcs()) | |
1792 card_num = predict_young_card_num(rs_length); | |
1793 else | |
1794 card_num = predict_non_young_card_num(rs_length); | |
1795 return predict_base_elapsed_time_ms(pending_cards, card_num); | |
1796 } | |
1797 | |
1798 double | |
1799 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
1800 size_t scanned_cards) { | |
1801 return | |
1802 predict_rs_update_time_ms(pending_cards) + | |
1803 predict_rs_scan_time_ms(scanned_cards) + | |
1804 predict_constant_other_time_ms(); | |
1805 } | |
1806 | |
1807 double | |
1808 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
1809 bool young) { | |
1810 size_t rs_length = hr->rem_set()->occupied(); | |
1811 size_t card_num; | |
1812 if (full_young_gcs()) | |
1813 card_num = predict_young_card_num(rs_length); | |
1814 else | |
1815 card_num = predict_non_young_card_num(rs_length); | |
1816 size_t bytes_to_copy = predict_bytes_to_copy(hr); | |
1817 | |
1818 double region_elapsed_time_ms = | |
1819 predict_rs_scan_time_ms(card_num) + | |
1820 predict_object_copy_time_ms(bytes_to_copy); | |
1821 | |
1822 if (young) | |
1823 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
1824 else | |
1825 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
1826 | |
1827 return region_elapsed_time_ms; | |
1828 } | |
1829 | |
1830 size_t | |
1831 G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { | |
1832 size_t bytes_to_copy; | |
1833 if (hr->is_marked()) | |
1834 bytes_to_copy = hr->max_live_bytes(); | |
1835 else { | |
1836 guarantee( hr->is_young() && hr->age_in_surv_rate_group() != -1, | |
1837 "invariant" ); | |
1838 int age = hr->age_in_surv_rate_group(); | |
545 | 1839 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
342 | 1840 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
1841 } | |
1842 | |
1843 return bytes_to_copy; | |
1844 } | |
1845 | |
1846 void | |
1847 G1CollectorPolicy::start_recording_regions() { | |
1848 _recorded_rs_lengths = 0; | |
1849 _recorded_young_regions = 0; | |
1850 _recorded_non_young_regions = 0; | |
1851 | |
1852 #if PREDICTIONS_VERBOSE | |
1853 _recorded_marked_bytes = 0; | |
1854 _recorded_young_bytes = 0; | |
1855 _predicted_bytes_to_copy = 0; | |
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1856 _predicted_rs_lengths = 0; |
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1857 _predicted_cards_scanned = 0; |
342 | 1858 #endif // PREDICTIONS_VERBOSE |
1859 } | |
1860 | |
1861 void | |
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1862 G1CollectorPolicy::record_cset_region_info(HeapRegion* hr, bool young) { |
342 | 1863 #if PREDICTIONS_VERBOSE |
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1864 if (!young) { |
342 | 1865 _recorded_marked_bytes += hr->max_live_bytes(); |
1866 } | |
1867 _predicted_bytes_to_copy += predict_bytes_to_copy(hr); | |
1868 #endif // PREDICTIONS_VERBOSE | |
1869 | |
1870 size_t rs_length = hr->rem_set()->occupied(); | |
1871 _recorded_rs_lengths += rs_length; | |
1872 } | |
1873 | |
1874 void | |
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1875 G1CollectorPolicy::record_non_young_cset_region(HeapRegion* hr) { |
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1876 assert(!hr->is_young(), "should not call this"); |
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1877 ++_recorded_non_young_regions; |
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1878 record_cset_region_info(hr, false); |
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1879 } |
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1880 |
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1881 void |
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1882 G1CollectorPolicy::set_recorded_young_regions(size_t n_regions) { |
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1883 _recorded_young_regions = n_regions; |
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1884 } |
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1885 |
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1886 void G1CollectorPolicy::set_recorded_young_bytes(size_t bytes) { |
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1887 #if PREDICTIONS_VERBOSE |
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1888 _recorded_young_bytes = bytes; |
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1889 #endif // PREDICTIONS_VERBOSE |
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1890 } |
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1891 |
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1892 void G1CollectorPolicy::set_recorded_rs_lengths(size_t rs_lengths) { |
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1893 _recorded_rs_lengths = rs_lengths; |
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1894 } |
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1895 |
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1896 void G1CollectorPolicy::set_predicted_bytes_to_copy(size_t bytes) { |
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1897 _predicted_bytes_to_copy = bytes; |
342 | 1898 } |
1899 | |
1900 void | |
1901 G1CollectorPolicy::end_recording_regions() { | |
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1902 // The _predicted_pause_time_ms field is referenced in code |
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1903 // not under PREDICTIONS_VERBOSE. Let's initialize it. |
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1904 _predicted_pause_time_ms = -1.0; |
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1905 |
342 | 1906 #if PREDICTIONS_VERBOSE |
1907 _predicted_pending_cards = predict_pending_cards(); | |
1908 _predicted_rs_lengths = _recorded_rs_lengths + predict_rs_length_diff(); | |
1909 if (full_young_gcs()) | |
1910 _predicted_cards_scanned += predict_young_card_num(_predicted_rs_lengths); | |
1911 else | |
1912 _predicted_cards_scanned += | |
1913 predict_non_young_card_num(_predicted_rs_lengths); | |
1914 _recorded_region_num = _recorded_young_regions + _recorded_non_young_regions; | |
1915 | |
1916 _predicted_rs_update_time_ms = | |
1917 predict_rs_update_time_ms(_g1->pending_card_num()); | |
1918 _predicted_rs_scan_time_ms = | |
1919 predict_rs_scan_time_ms(_predicted_cards_scanned); | |
1920 _predicted_object_copy_time_ms = | |
1921 predict_object_copy_time_ms(_predicted_bytes_to_copy); | |
1922 _predicted_constant_other_time_ms = | |
1923 predict_constant_other_time_ms(); | |
1924 _predicted_young_other_time_ms = | |
1925 predict_young_other_time_ms(_recorded_young_regions); | |
1926 _predicted_non_young_other_time_ms = | |
1927 predict_non_young_other_time_ms(_recorded_non_young_regions); | |
1928 | |
1929 _predicted_pause_time_ms = | |
1930 _predicted_rs_update_time_ms + | |
1931 _predicted_rs_scan_time_ms + | |
1932 _predicted_object_copy_time_ms + | |
1933 _predicted_constant_other_time_ms + | |
1934 _predicted_young_other_time_ms + | |
1935 _predicted_non_young_other_time_ms; | |
1936 #endif // PREDICTIONS_VERBOSE | |
1937 } | |
1938 | |
1939 void G1CollectorPolicy::check_if_region_is_too_expensive(double | |
1940 predicted_time_ms) { | |
1941 // I don't think we need to do this when in young GC mode since | |
1942 // marking will be initiated next time we hit the soft limit anyway... | |
1943 if (predicted_time_ms > _expensive_region_limit_ms) { | |
1944 if (!in_young_gc_mode()) { | |
1945 set_full_young_gcs(true); | |
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1946 // We might want to do something different here. However, |
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1947 // right now we don't support the non-generational G1 mode |
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1948 // (and in fact we are planning to remove the associated code, |
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1949 // see CR 6814390). So, let's leave it as is and this will be |
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1950 // removed some time in the future |
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1951 ShouldNotReachHere(); |
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1952 set_during_initial_mark_pause(); |
342 | 1953 } else |
1954 // no point in doing another partial one | |
1955 _should_revert_to_full_young_gcs = true; | |
1956 } | |
1957 } | |
1958 | |
1959 // </NEW PREDICTION> | |
1960 | |
1961 | |
1962 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, | |
1963 double elapsed_ms) { | |
1964 _recent_gc_times_ms->add(elapsed_ms); | |
1965 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
1966 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
1967 } | |
1968 | |
1969 double G1CollectorPolicy::recent_avg_time_for_pauses_ms() { | |
751 | 1970 if (_recent_pause_times_ms->num() == 0) return (double) MaxGCPauseMillis; |
342 | 1971 else return _recent_pause_times_ms->avg(); |
1972 } | |
1973 | |
1974 double G1CollectorPolicy::recent_avg_time_for_CH_strong_ms() { | |
1975 if (_recent_CH_strong_roots_times_ms->num() == 0) | |
751 | 1976 return (double)MaxGCPauseMillis/3.0; |
342 | 1977 else return _recent_CH_strong_roots_times_ms->avg(); |
1978 } | |
1979 | |
1980 double G1CollectorPolicy::recent_avg_time_for_G1_strong_ms() { | |
1981 if (_recent_G1_strong_roots_times_ms->num() == 0) | |
751 | 1982 return (double)MaxGCPauseMillis/3.0; |
342 | 1983 else return _recent_G1_strong_roots_times_ms->avg(); |
1984 } | |
1985 | |
1986 double G1CollectorPolicy::recent_avg_time_for_evac_ms() { | |
751 | 1987 if (_recent_evac_times_ms->num() == 0) return (double)MaxGCPauseMillis/3.0; |
342 | 1988 else return _recent_evac_times_ms->avg(); |
1989 } | |
1990 | |
1991 int G1CollectorPolicy::number_of_recent_gcs() { | |
1992 assert(_recent_CH_strong_roots_times_ms->num() == | |
1993 _recent_G1_strong_roots_times_ms->num(), "Sequence out of sync"); | |
1994 assert(_recent_G1_strong_roots_times_ms->num() == | |
1995 _recent_evac_times_ms->num(), "Sequence out of sync"); | |
1996 assert(_recent_evac_times_ms->num() == | |
1997 _recent_pause_times_ms->num(), "Sequence out of sync"); | |
1998 assert(_recent_pause_times_ms->num() == | |
1999 _recent_CS_bytes_used_before->num(), "Sequence out of sync"); | |
2000 assert(_recent_CS_bytes_used_before->num() == | |
2001 _recent_CS_bytes_surviving->num(), "Sequence out of sync"); | |
2002 return _recent_pause_times_ms->num(); | |
2003 } | |
2004 | |
2005 double G1CollectorPolicy::recent_avg_survival_fraction() { | |
2006 return recent_avg_survival_fraction_work(_recent_CS_bytes_surviving, | |
2007 _recent_CS_bytes_used_before); | |
2008 } | |
2009 | |
2010 double G1CollectorPolicy::last_survival_fraction() { | |
2011 return last_survival_fraction_work(_recent_CS_bytes_surviving, | |
2012 _recent_CS_bytes_used_before); | |
2013 } | |
2014 | |
2015 double | |
2016 G1CollectorPolicy::recent_avg_survival_fraction_work(TruncatedSeq* surviving, | |
2017 TruncatedSeq* before) { | |
2018 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
2019 if (before->sum() > 0.0) { | |
2020 double recent_survival_rate = surviving->sum() / before->sum(); | |
2021 // We exempt parallel collection from this check because Alloc Buffer | |
2022 // fragmentation can produce negative collections. | |
2023 // Further, we're now always doing parallel collection. But I'm still | |
2024 // leaving this here as a placeholder for a more precise assertion later. | |
2025 // (DLD, 10/05.) | |
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2026 assert((true || G1CollectedHeap::use_parallel_gc_threads()) || |
342 | 2027 _g1->evacuation_failed() || |
2028 recent_survival_rate <= 1.0, "Or bad frac"); | |
2029 return recent_survival_rate; | |
2030 } else { | |
2031 return 1.0; // Be conservative. | |
2032 } | |
2033 } | |
2034 | |
2035 double | |
2036 G1CollectorPolicy::last_survival_fraction_work(TruncatedSeq* surviving, | |
2037 TruncatedSeq* before) { | |
2038 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
2039 if (surviving->num() > 0 && before->last() > 0.0) { | |
2040 double last_survival_rate = surviving->last() / before->last(); | |
2041 // We exempt parallel collection from this check because Alloc Buffer | |
2042 // fragmentation can produce negative collections. | |
2043 // Further, we're now always doing parallel collection. But I'm still | |
2044 // leaving this here as a placeholder for a more precise assertion later. | |
2045 // (DLD, 10/05.) | |
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2046 assert((true || G1CollectedHeap::use_parallel_gc_threads()) || |
342 | 2047 last_survival_rate <= 1.0, "Or bad frac"); |
2048 return last_survival_rate; | |
2049 } else { | |
2050 return 1.0; | |
2051 } | |
2052 } | |
2053 | |
2054 static const int survival_min_obs = 5; | |
2055 static double survival_min_obs_limits[] = { 0.9, 0.7, 0.5, 0.3, 0.1 }; | |
2056 static const double min_survival_rate = 0.1; | |
2057 | |
2058 double | |
2059 G1CollectorPolicy::conservative_avg_survival_fraction_work(double avg, | |
2060 double latest) { | |
2061 double res = avg; | |
2062 if (number_of_recent_gcs() < survival_min_obs) { | |
2063 res = MAX2(res, survival_min_obs_limits[number_of_recent_gcs()]); | |
2064 } | |
2065 res = MAX2(res, latest); | |
2066 res = MAX2(res, min_survival_rate); | |
2067 // In the parallel case, LAB fragmentation can produce "negative | |
2068 // collections"; so can evac failure. Cap at 1.0 | |
2069 res = MIN2(res, 1.0); | |
2070 return res; | |
2071 } | |
2072 | |
2073 size_t G1CollectorPolicy::expansion_amount() { | |
1356 | 2074 if ((recent_avg_pause_time_ratio() * 100.0) > _gc_overhead_perc) { |
751 | 2075 // We will double the existing space, or take |
2076 // G1ExpandByPercentOfAvailable % of the available expansion | |
2077 // space, whichever is smaller, bounded below by a minimum | |
2078 // expansion (unless that's all that's left.) | |
342 | 2079 const size_t min_expand_bytes = 1*M; |
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2080 size_t reserved_bytes = _g1->max_capacity(); |
342 | 2081 size_t committed_bytes = _g1->capacity(); |
2082 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
2083 size_t expand_bytes; | |
2084 size_t expand_bytes_via_pct = | |
751 | 2085 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
342 | 2086 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
2087 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
2088 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
2089 if (G1PolicyVerbose > 1) { | |
2090 gclog_or_tty->print("Decided to expand: ratio = %5.2f, " | |
2091 "committed = %d%s, uncommited = %d%s, via pct = %d%s.\n" | |
2092 " Answer = %d.\n", | |
2093 recent_avg_pause_time_ratio(), | |
2094 byte_size_in_proper_unit(committed_bytes), | |
2095 proper_unit_for_byte_size(committed_bytes), | |
2096 byte_size_in_proper_unit(uncommitted_bytes), | |
2097 proper_unit_for_byte_size(uncommitted_bytes), | |
2098 byte_size_in_proper_unit(expand_bytes_via_pct), | |
2099 proper_unit_for_byte_size(expand_bytes_via_pct), | |
2100 byte_size_in_proper_unit(expand_bytes), | |
2101 proper_unit_for_byte_size(expand_bytes)); | |
2102 } | |
2103 return expand_bytes; | |
2104 } else { | |
2105 return 0; | |
2106 } | |
2107 } | |
2108 | |
2109 void G1CollectorPolicy::note_start_of_mark_thread() { | |
2110 _mark_thread_startup_sec = os::elapsedTime(); | |
2111 } | |
2112 | |
2113 class CountCSClosure: public HeapRegionClosure { | |
2114 G1CollectorPolicy* _g1_policy; | |
2115 public: | |
2116 CountCSClosure(G1CollectorPolicy* g1_policy) : | |
2117 _g1_policy(g1_policy) {} | |
2118 bool doHeapRegion(HeapRegion* r) { | |
2119 _g1_policy->_bytes_in_collection_set_before_gc += r->used(); | |
2120 return false; | |
2121 } | |
2122 }; | |
2123 | |
2124 void G1CollectorPolicy::count_CS_bytes_used() { | |
2125 CountCSClosure cs_closure(this); | |
2126 _g1->collection_set_iterate(&cs_closure); | |
2127 } | |
2128 | |
2129 void G1CollectorPolicy::print_summary (int level, | |
2130 const char* str, | |
2131 NumberSeq* seq) const { | |
2132 double sum = seq->sum(); | |
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2133 LineBuffer(level + 1).append_and_print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", |
342 | 2134 str, sum / 1000.0, seq->avg()); |
2135 } | |
2136 | |
2137 void G1CollectorPolicy::print_summary_sd (int level, | |
2138 const char* str, | |
2139 NumberSeq* seq) const { | |
2140 print_summary(level, str, seq); | |
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2141 LineBuffer(level + 6).append_and_print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", |
342 | 2142 seq->num(), seq->sd(), seq->maximum()); |
2143 } | |
2144 | |
2145 void G1CollectorPolicy::check_other_times(int level, | |
2146 NumberSeq* other_times_ms, | |
2147 NumberSeq* calc_other_times_ms) const { | |
2148 bool should_print = false; | |
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2149 LineBuffer buf(level + 2); |
342 | 2150 |
2151 double max_sum = MAX2(fabs(other_times_ms->sum()), | |
2152 fabs(calc_other_times_ms->sum())); | |
2153 double min_sum = MIN2(fabs(other_times_ms->sum()), | |
2154 fabs(calc_other_times_ms->sum())); | |
2155 double sum_ratio = max_sum / min_sum; | |
2156 if (sum_ratio > 1.1) { | |
2157 should_print = true; | |
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2158 buf.append_and_print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); |
342 | 2159 } |
2160 | |
2161 double max_avg = MAX2(fabs(other_times_ms->avg()), | |
2162 fabs(calc_other_times_ms->avg())); | |
2163 double min_avg = MIN2(fabs(other_times_ms->avg()), | |
2164 fabs(calc_other_times_ms->avg())); | |
2165 double avg_ratio = max_avg / min_avg; | |
2166 if (avg_ratio > 1.1) { | |
2167 should_print = true; | |
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2168 buf.append_and_print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); |
342 | 2169 } |
2170 | |
2171 if (other_times_ms->sum() < -0.01) { | |
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2172 buf.append_and_print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); |
342 | 2173 } |
2174 | |
2175 if (other_times_ms->avg() < -0.01) { | |
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2176 buf.append_and_print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); |
342 | 2177 } |
2178 | |
2179 if (calc_other_times_ms->sum() < -0.01) { | |
2180 should_print = true; | |
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2181 buf.append_and_print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); |
342 | 2182 } |
2183 | |
2184 if (calc_other_times_ms->avg() < -0.01) { | |
2185 should_print = true; | |
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2186 buf.append_and_print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); |
342 | 2187 } |
2188 | |
2189 if (should_print) | |
2190 print_summary(level, "Other(Calc)", calc_other_times_ms); | |
2191 } | |
2192 | |
2193 void G1CollectorPolicy::print_summary(PauseSummary* summary) const { | |
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2194 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
342 | 2195 MainBodySummary* body_summary = summary->main_body_summary(); |
2196 if (summary->get_total_seq()->num() > 0) { | |
677 | 2197 print_summary_sd(0, "Evacuation Pauses", summary->get_total_seq()); |
342 | 2198 if (body_summary != NULL) { |
2199 print_summary(1, "SATB Drain", body_summary->get_satb_drain_seq()); | |
2200 if (parallel) { | |
2201 print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); | |
2202 print_summary(2, "Update RS", body_summary->get_update_rs_seq()); | |
2203 print_summary(2, "Ext Root Scanning", | |
2204 body_summary->get_ext_root_scan_seq()); | |
2205 print_summary(2, "Mark Stack Scanning", | |
2206 body_summary->get_mark_stack_scan_seq()); | |
2207 print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); | |
2208 print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); | |
2209 print_summary(2, "Termination", body_summary->get_termination_seq()); | |
2210 print_summary(2, "Other", body_summary->get_parallel_other_seq()); | |
2211 { | |
2212 NumberSeq* other_parts[] = { | |
2213 body_summary->get_update_rs_seq(), | |
2214 body_summary->get_ext_root_scan_seq(), | |
2215 body_summary->get_mark_stack_scan_seq(), | |
2216 body_summary->get_scan_rs_seq(), | |
2217 body_summary->get_obj_copy_seq(), | |
2218 body_summary->get_termination_seq() | |
2219 }; | |
2220 NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), | |
1779 | 2221 6, other_parts); |
342 | 2222 check_other_times(2, body_summary->get_parallel_other_seq(), |
2223 &calc_other_times_ms); | |
2224 } | |
2225 print_summary(1, "Mark Closure", body_summary->get_mark_closure_seq()); | |
2226 print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); | |
2227 } else { | |
2228 print_summary(1, "Update RS", body_summary->get_update_rs_seq()); | |
2229 print_summary(1, "Ext Root Scanning", | |
2230 body_summary->get_ext_root_scan_seq()); | |
2231 print_summary(1, "Mark Stack Scanning", | |
2232 body_summary->get_mark_stack_scan_seq()); | |
2233 print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); | |
2234 print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); | |
2235 } | |
2236 } | |
2237 print_summary(1, "Other", summary->get_other_seq()); | |
2238 { | |
1779 | 2239 if (body_summary != NULL) { |
2240 NumberSeq calc_other_times_ms; | |
2241 if (parallel) { | |
2242 // parallel | |
2243 NumberSeq* other_parts[] = { | |
2244 body_summary->get_satb_drain_seq(), | |
2245 body_summary->get_parallel_seq(), | |
2246 body_summary->get_clear_ct_seq() | |
2247 }; | |
2248 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
2249 3, other_parts); | |
2250 } else { | |
2251 // serial | |
2252 NumberSeq* other_parts[] = { | |
2253 body_summary->get_satb_drain_seq(), | |
2254 body_summary->get_update_rs_seq(), | |
2255 body_summary->get_ext_root_scan_seq(), | |
2256 body_summary->get_mark_stack_scan_seq(), | |
2257 body_summary->get_scan_rs_seq(), | |
2258 body_summary->get_obj_copy_seq() | |
2259 }; | |
2260 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
2261 6, other_parts); | |
2262 } | |
2263 check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); | |
342 | 2264 } |
2265 } | |
2266 } else { | |
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2267 LineBuffer(1).append_and_print_cr("none"); |
342 | 2268 } |
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2269 LineBuffer(0).append_and_print_cr(""); |
342 | 2270 } |
2271 | |
2272 void G1CollectorPolicy::print_tracing_info() const { | |
2273 if (TraceGen0Time) { | |
2274 gclog_or_tty->print_cr("ALL PAUSES"); | |
2275 print_summary_sd(0, "Total", _all_pause_times_ms); | |
2276 gclog_or_tty->print_cr(""); | |
2277 gclog_or_tty->print_cr(""); | |
2278 gclog_or_tty->print_cr(" Full Young GC Pauses: %8d", _full_young_pause_num); | |
2279 gclog_or_tty->print_cr(" Partial Young GC Pauses: %8d", _partial_young_pause_num); | |
2280 gclog_or_tty->print_cr(""); | |
2281 | |
677 | 2282 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
2283 print_summary(_summary); | |
342 | 2284 |
2285 gclog_or_tty->print_cr("MISC"); | |
2286 print_summary_sd(0, "Stop World", _all_stop_world_times_ms); | |
2287 print_summary_sd(0, "Yields", _all_yield_times_ms); | |
2288 for (int i = 0; i < _aux_num; ++i) { | |
2289 if (_all_aux_times_ms[i].num() > 0) { | |
2290 char buffer[96]; | |
2291 sprintf(buffer, "Aux%d", i); | |
2292 print_summary_sd(0, buffer, &_all_aux_times_ms[i]); | |
2293 } | |
2294 } | |
2295 | |
2296 size_t all_region_num = _region_num_young + _region_num_tenured; | |
2297 gclog_or_tty->print_cr(" New Regions %8d, Young %8d (%6.2lf%%), " | |
2298 "Tenured %8d (%6.2lf%%)", | |
2299 all_region_num, | |
2300 _region_num_young, | |
2301 (double) _region_num_young / (double) all_region_num * 100.0, | |
2302 _region_num_tenured, | |
2303 (double) _region_num_tenured / (double) all_region_num * 100.0); | |
2304 } | |
2305 if (TraceGen1Time) { | |
2306 if (_all_full_gc_times_ms->num() > 0) { | |
2307 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", | |
2308 _all_full_gc_times_ms->num(), | |
2309 _all_full_gc_times_ms->sum() / 1000.0); | |
2310 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); | |
2311 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", | |
2312 _all_full_gc_times_ms->sd(), | |
2313 _all_full_gc_times_ms->maximum()); | |
2314 } | |
2315 } | |
2316 } | |
2317 | |
2318 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
2319 #ifndef PRODUCT | |
2320 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
2321 // add this call for any other surv rate groups | |
2322 #endif // PRODUCT | |
2323 } | |
2324 | |
1973 | 2325 void |
2326 G1CollectorPolicy::update_region_num(bool young) { | |
2327 if (young) { | |
342 | 2328 ++_region_num_young; |
2329 } else { | |
2330 ++_region_num_tenured; | |
2331 } | |
2332 } | |
2333 | |
2334 #ifndef PRODUCT | |
2335 // for debugging, bit of a hack... | |
2336 static char* | |
2337 region_num_to_mbs(int length) { | |
2338 static char buffer[64]; | |
2339 double bytes = (double) (length * HeapRegion::GrainBytes); | |
2340 double mbs = bytes / (double) (1024 * 1024); | |
2341 sprintf(buffer, "%7.2lfMB", mbs); | |
2342 return buffer; | |
2343 } | |
2344 #endif // PRODUCT | |
2345 | |
545 | 2346 size_t G1CollectorPolicy::max_regions(int purpose) { |
342 | 2347 switch (purpose) { |
2348 case GCAllocForSurvived: | |
545 | 2349 return _max_survivor_regions; |
342 | 2350 case GCAllocForTenured: |
545 | 2351 return REGIONS_UNLIMITED; |
342 | 2352 default: |
545 | 2353 ShouldNotReachHere(); |
2354 return REGIONS_UNLIMITED; | |
342 | 2355 }; |
2356 } | |
2357 | |
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2358 void G1CollectorPolicy::calculate_max_gc_locker_expansion() { |
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2359 size_t expansion_region_num = 0; |
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2360 if (GCLockerEdenExpansionPercent > 0) { |
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2361 double perc = (double) GCLockerEdenExpansionPercent / 100.0; |
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2362 double expansion_region_num_d = perc * (double) _young_list_target_length; |
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2363 // We use ceiling so that if expansion_region_num_d is > 0.0 (but |
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2364 // less than 1.0) we'll get 1. |
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2365 expansion_region_num = (size_t) ceil(expansion_region_num_d); |
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2366 } else { |
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2367 assert(expansion_region_num == 0, "sanity"); |
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2368 } |
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2369 _young_list_max_length = _young_list_target_length + expansion_region_num; |
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2370 assert(_young_list_target_length <= _young_list_max_length, "post-condition"); |
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2371 } |
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2372 |
545 | 2373 // Calculates survivor space parameters. |
2374 void G1CollectorPolicy::calculate_survivors_policy() | |
2375 { | |
2376 if (G1FixedSurvivorSpaceSize == 0) { | |
2377 _max_survivor_regions = _young_list_target_length / SurvivorRatio; | |
2378 } else { | |
547
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2379 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
545 | 2380 } |
2381 | |
2382 if (G1FixedTenuringThreshold) { | |
2383 _tenuring_threshold = MaxTenuringThreshold; | |
2384 } else { | |
2385 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( | |
2386 HeapRegion::GrainWords * _max_survivor_regions); | |
2387 } | |
2388 } | |
2389 | |
342 | 2390 #ifndef PRODUCT |
2391 class HRSortIndexIsOKClosure: public HeapRegionClosure { | |
2392 CollectionSetChooser* _chooser; | |
2393 public: | |
2394 HRSortIndexIsOKClosure(CollectionSetChooser* chooser) : | |
2395 _chooser(chooser) {} | |
2396 | |
2397 bool doHeapRegion(HeapRegion* r) { | |
2398 if (!r->continuesHumongous()) { | |
2399 assert(_chooser->regionProperlyOrdered(r), "Ought to be."); | |
2400 } | |
2401 return false; | |
2402 } | |
2403 }; | |
2404 | |
2405 bool G1CollectorPolicy_BestRegionsFirst::assertMarkedBytesDataOK() { | |
2406 HRSortIndexIsOKClosure cl(_collectionSetChooser); | |
2407 _g1->heap_region_iterate(&cl); | |
2408 return true; | |
2409 } | |
2410 #endif | |
2411 | |
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2412 bool |
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2413 G1CollectorPolicy::force_initial_mark_if_outside_cycle() { |
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2414 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2415 if (!during_cycle) { |
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2416 set_initiate_conc_mark_if_possible(); |
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2417 return true; |
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|
2418 } else { |
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2419 return false; |
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2420 } |
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2421 } |
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2422 |
342 | 2423 void |
1359
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2424 G1CollectorPolicy::decide_on_conc_mark_initiation() { |
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2425 // We are about to decide on whether this pause will be an |
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2426 // initial-mark pause. |
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2427 |
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2428 // First, during_initial_mark_pause() should not be already set. We |
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2429 // will set it here if we have to. However, it should be cleared by |
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2430 // the end of the pause (it's only set for the duration of an |
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2431 // initial-mark pause). |
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2432 assert(!during_initial_mark_pause(), "pre-condition"); |
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2433 |
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|
2434 if (initiate_conc_mark_if_possible()) { |
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2435 // We had noticed on a previous pause that the heap occupancy has |
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2436 // gone over the initiating threshold and we should start a |
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2437 // concurrent marking cycle. So we might initiate one. |
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2438 |
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|
2439 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2440 if (!during_cycle) { |
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2441 // The concurrent marking thread is not "during a cycle", i.e., |
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2442 // it has completed the last one. So we can go ahead and |
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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2443 // initiate a new cycle. |
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2444 |
23b1b27ac76c
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|
2445 set_during_initial_mark_pause(); |
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|
2446 |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2447 // And we can now clear initiate_conc_mark_if_possible() as |
23b1b27ac76c
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|
2448 // we've already acted on it. |
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2449 clear_initiate_conc_mark_if_possible(); |
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|
2450 } else { |
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|
2451 // The concurrent marking thread is still finishing up the |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
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|
2452 // previous cycle. If we start one right now the two cycles |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2453 // overlap. In particular, the concurrent marking thread might |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
diff
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|
2454 // be in the process of clearing the next marking bitmap (which |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
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|
2455 // we will use for the next cycle if we start one). Starting a |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
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|
2456 // cycle now will be bad given that parts of the marking |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2457 // information might get cleared by the marking thread. And we |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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diff
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|
2458 // cannot wait for the marking thread to finish the cycle as it |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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diff
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|
2459 // periodically yields while clearing the next marking bitmap |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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diff
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|
2460 // and, if it's in a yield point, it's waiting for us to |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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diff
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|
2461 // finish. So, at this point we will not start a cycle and we'll |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2462 // let the concurrent marking thread complete the last one. |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2463 } |
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2464 } |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2465 } |
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2466 |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2467 void |
342 | 2468 G1CollectorPolicy_BestRegionsFirst:: |
2469 record_collection_pause_start(double start_time_sec, size_t start_used) { | |
2470 G1CollectorPolicy::record_collection_pause_start(start_time_sec, start_used); | |
2471 } | |
2472 | |
2473 class KnownGarbageClosure: public HeapRegionClosure { | |
2474 CollectionSetChooser* _hrSorted; | |
2475 | |
2476 public: | |
2477 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
2478 _hrSorted(hrSorted) | |
2479 {} | |
2480 | |
2481 bool doHeapRegion(HeapRegion* r) { | |
2482 // We only include humongous regions in collection | |
2483 // sets when concurrent mark shows that their contained object is | |
2484 // unreachable. | |
2485 | |
2486 // Do we have any marking information for this region? | |
2487 if (r->is_marked()) { | |
2488 // We don't include humongous regions in collection | |
2489 // sets because we collect them immediately at the end of a marking | |
2490 // cycle. We also don't include young regions because we *must* | |
2491 // include them in the next collection pause. | |
2492 if (!r->isHumongous() && !r->is_young()) { | |
2493 _hrSorted->addMarkedHeapRegion(r); | |
2494 } | |
2495 } | |
2496 return false; | |
2497 } | |
2498 }; | |
2499 | |
2500 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
2501 CollectionSetChooser* _hrSorted; | |
2502 jint _marked_regions_added; | |
2503 jint _chunk_size; | |
2504 jint _cur_chunk_idx; | |
2505 jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) | |
2506 int _worker; | |
2507 int _invokes; | |
2508 | |
2509 void get_new_chunk() { | |
2510 _cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size); | |
2511 _cur_chunk_end = _cur_chunk_idx + _chunk_size; | |
2512 } | |
2513 void add_region(HeapRegion* r) { | |
2514 if (_cur_chunk_idx == _cur_chunk_end) { | |
2515 get_new_chunk(); | |
2516 } | |
2517 assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); | |
2518 _hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r); | |
2519 _marked_regions_added++; | |
2520 _cur_chunk_idx++; | |
2521 } | |
2522 | |
2523 public: | |
2524 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
2525 jint chunk_size, | |
2526 int worker) : | |
2527 _hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker), | |
2528 _marked_regions_added(0), _cur_chunk_idx(0), _cur_chunk_end(0), | |
2529 _invokes(0) | |
2530 {} | |
2531 | |
2532 bool doHeapRegion(HeapRegion* r) { | |
2533 // We only include humongous regions in collection | |
2534 // sets when concurrent mark shows that their contained object is | |
2535 // unreachable. | |
2536 _invokes++; | |
2537 | |
2538 // Do we have any marking information for this region? | |
2539 if (r->is_marked()) { | |
2540 // We don't include humongous regions in collection | |
2541 // sets because we collect them immediately at the end of a marking | |
2542 // cycle. | |
2543 // We also do not include young regions in collection sets | |
2544 if (!r->isHumongous() && !r->is_young()) { | |
2545 add_region(r); | |
2546 } | |
2547 } | |
2548 return false; | |
2549 } | |
2550 jint marked_regions_added() { return _marked_regions_added; } | |
2551 int invokes() { return _invokes; } | |
2552 }; | |
2553 | |
2554 class ParKnownGarbageTask: public AbstractGangTask { | |
2555 CollectionSetChooser* _hrSorted; | |
2556 jint _chunk_size; | |
2557 G1CollectedHeap* _g1; | |
2558 public: | |
2559 ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) : | |
2560 AbstractGangTask("ParKnownGarbageTask"), | |
2561 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
2562 _g1(G1CollectedHeap::heap()) | |
2563 {} | |
2564 | |
2565 void work(int i) { | |
2566 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size, i); | |
2567 // Back to zero for the claim value. | |
355 | 2568 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, i, |
2569 HeapRegion::InitialClaimValue); | |
342 | 2570 jint regions_added = parKnownGarbageCl.marked_regions_added(); |
2571 _hrSorted->incNumMarkedHeapRegions(regions_added); | |
2572 if (G1PrintParCleanupStats) { | |
2363
c93aa6caa02f
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brutisso
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2188
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|
2573 gclog_or_tty->print_cr(" Thread %d called %d times, added %d regions to list.", |
342 | 2574 i, parKnownGarbageCl.invokes(), regions_added); |
2575 } | |
2576 } | |
2577 }; | |
2578 | |
2579 void | |
2580 G1CollectorPolicy_BestRegionsFirst:: | |
2581 record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
2582 size_t max_live_bytes) { | |
2583 double start; | |
2584 if (G1PrintParCleanupStats) start = os::elapsedTime(); | |
2585 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
2586 | |
2587 _collectionSetChooser->clearMarkedHeapRegions(); | |
2588 double clear_marked_end; | |
2589 if (G1PrintParCleanupStats) { | |
2590 clear_marked_end = os::elapsedTime(); | |
2591 gclog_or_tty->print_cr(" clear marked regions + work1: %8.3f ms.", | |
2592 (clear_marked_end - start)*1000.0); | |
2593 } | |
1833
8b10f48633dc
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|
2594 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 2595 const size_t OverpartitionFactor = 4; |
1571
2d127394260e
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|
2596 const size_t MinWorkUnit = 8; |
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|
2597 const size_t WorkUnit = |
342 | 2598 MAX2(_g1->n_regions() / (ParallelGCThreads * OverpartitionFactor), |
1571
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|
2599 MinWorkUnit); |
342 | 2600 _collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(), |
1571
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|
2601 WorkUnit); |
342 | 2602 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
1571
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2603 (int) WorkUnit); |
342 | 2604 _g1->workers()->run_task(&parKnownGarbageTask); |
355 | 2605 |
2606 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2607 "sanity check"); | |
342 | 2608 } else { |
2609 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
2610 _g1->heap_region_iterate(&knownGarbagecl); | |
2611 } | |
2612 double known_garbage_end; | |
2613 if (G1PrintParCleanupStats) { | |
2614 known_garbage_end = os::elapsedTime(); | |
2615 gclog_or_tty->print_cr(" compute known garbage: %8.3f ms.", | |
2616 (known_garbage_end - clear_marked_end)*1000.0); | |
2617 } | |
2618 _collectionSetChooser->sortMarkedHeapRegions(); | |
2619 double sort_end; | |
2620 if (G1PrintParCleanupStats) { | |
2621 sort_end = os::elapsedTime(); | |
2622 gclog_or_tty->print_cr(" sorting: %8.3f ms.", | |
2623 (sort_end - known_garbage_end)*1000.0); | |
2624 } | |
2625 | |
2626 record_concurrent_mark_cleanup_end_work2(); | |
2627 double work2_end; | |
2628 if (G1PrintParCleanupStats) { | |
2629 work2_end = os::elapsedTime(); | |
2630 gclog_or_tty->print_cr(" work2: %8.3f ms.", | |
2631 (work2_end - sort_end)*1000.0); | |
2632 } | |
2633 } | |
2634 | |
1394
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|
2635 // Add the heap region at the head of the non-incremental collection set |
342 | 2636 void G1CollectorPolicy:: |
2637 add_to_collection_set(HeapRegion* hr) { | |
1394
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2638 assert(_inc_cset_build_state == Active, "Precondition"); |
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2639 assert(!hr->is_young(), "non-incremental add of young region"); |
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2640 |
342 | 2641 if (_g1->mark_in_progress()) |
2642 _g1->concurrent_mark()->registerCSetRegion(hr); | |
2643 | |
1394
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|
2644 assert(!hr->in_collection_set(), "should not already be in the CSet"); |
342 | 2645 hr->set_in_collection_set(true); |
2646 hr->set_next_in_collection_set(_collection_set); | |
2647 _collection_set = hr; | |
2648 _collection_set_size++; | |
2649 _collection_set_bytes_used_before += hr->used(); | |
526 | 2650 _g1->register_region_with_in_cset_fast_test(hr); |
342 | 2651 } |
2652 | |
1394
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|
2653 // Initialize the per-collection-set information |
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|
2654 void G1CollectorPolicy::start_incremental_cset_building() { |
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|
2655 assert(_inc_cset_build_state == Inactive, "Precondition"); |
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|
2656 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2657 _inc_cset_head = NULL; |
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|
2658 _inc_cset_tail = NULL; |
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|
2659 _inc_cset_size = 0; |
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|
2660 _inc_cset_bytes_used_before = 0; |
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|
2661 |
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|
2662 if (in_young_gc_mode()) { |
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|
2663 _inc_cset_young_index = 0; |
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|
2664 } |
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|
2665 |
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|
2666 _inc_cset_max_finger = 0; |
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|
2667 _inc_cset_recorded_young_bytes = 0; |
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|
2668 _inc_cset_recorded_rs_lengths = 0; |
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|
2669 _inc_cset_predicted_elapsed_time_ms = 0; |
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|
2670 _inc_cset_predicted_bytes_to_copy = 0; |
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|
2671 _inc_cset_build_state = Active; |
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|
2672 } |
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|
2673 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2674 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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|
2675 // This routine is used when: |
1316cec51b4d
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diff
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|
2676 // * adding survivor regions to the incremental cset at the end of an |
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parents:
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|
2677 // evacuation pause, |
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diff
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|
2678 // * adding the current allocation region to the incremental cset |
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|
2679 // when it is retired, and |
1316cec51b4d
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|
2680 // * updating existing policy information for a region in the |
1316cec51b4d
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parents:
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diff
changeset
|
2681 // incremental cset via young list RSet sampling. |
1316cec51b4d
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diff
changeset
|
2682 // Therefore this routine may be called at a safepoint by the |
1316cec51b4d
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diff
changeset
|
2683 // VM thread, or in-between safepoints by mutator threads (when |
1316cec51b4d
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parents:
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diff
changeset
|
2684 // retiring the current allocation region) or a concurrent |
1316cec51b4d
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diff
changeset
|
2685 // refine thread (RSet sampling). |
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diff
changeset
|
2686 |
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diff
changeset
|
2687 double region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, true); |
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|
2688 size_t used_bytes = hr->used(); |
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changeset
|
2689 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2690 _inc_cset_recorded_rs_lengths += rs_length; |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2691 _inc_cset_predicted_elapsed_time_ms += region_elapsed_time_ms; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
2692 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2693 _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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diff
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|
2694 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2695 // Cache the values we have added to the aggregated informtion |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
2696 // in the heap region in case we have to remove this region from |
1316cec51b4d
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diff
changeset
|
2697 // the incremental collection set, or it is updated by the |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2698 // rset sampling code |
1316cec51b4d
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diff
changeset
|
2699 hr->set_recorded_rs_length(rs_length); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2700 hr->set_predicted_elapsed_time_ms(region_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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|
2701 |
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diff
changeset
|
2702 #if PREDICTIONS_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
2703 size_t bytes_to_copy = predict_bytes_to_copy(hr); |
1316cec51b4d
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|
2704 _inc_cset_predicted_bytes_to_copy += 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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|
2705 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2706 // Record the number of bytes used in this region |
1316cec51b4d
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diff
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|
2707 _inc_cset_recorded_young_bytes += used_bytes; |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
2708 |
1316cec51b4d
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diff
changeset
|
2709 // Cache the values we have added to the aggregated informtion |
1316cec51b4d
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|
2710 // in the heap region in case we have to remove this region from |
1316cec51b4d
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diff
changeset
|
2711 // the incremental collection set, or it is updated by the |
1316cec51b4d
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diff
changeset
|
2712 // rset sampling code |
1316cec51b4d
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diff
changeset
|
2713 hr->set_predicted_bytes_to_copy(bytes_to_copy); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2714 #endif // PREDICTIONS_VERBOSE |
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|
2715 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2716 |
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diff
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|
2717 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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diff
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|
2718 // This routine is currently only called as part of the updating of |
1316cec51b4d
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diff
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|
2719 // existing policy information for regions in the incremental cset that |
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|
2720 // is performed by the concurrent refine thread(s) as part of young list |
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|
2721 // RSet sampling. Therefore we should not be at a safepoint. |
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|
2722 |
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changeset
|
2723 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); |
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|
2724 assert(hr->is_young(), "it should be"); |
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|
2725 |
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|
2726 size_t used_bytes = hr->used(); |
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|
2727 size_t old_rs_length = hr->recorded_rs_length(); |
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|
2728 double old_elapsed_time_ms = hr->predicted_elapsed_time_ms(); |
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|
2729 |
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diff
changeset
|
2730 // Subtract the old recorded/predicted policy information for |
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|
2731 // the given heap region from the collection set info. |
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|
2732 _inc_cset_recorded_rs_lengths -= old_rs_length; |
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changeset
|
2733 _inc_cset_predicted_elapsed_time_ms -= old_elapsed_time_ms; |
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|
2734 |
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|
2735 _inc_cset_bytes_used_before -= used_bytes; |
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|
2736 |
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diff
changeset
|
2737 // Clear the values cached in the heap region |
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diff
changeset
|
2738 hr->set_recorded_rs_length(0); |
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changeset
|
2739 hr->set_predicted_elapsed_time_ms(0); |
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|
2740 |
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diff
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|
2741 #if PREDICTIONS_VERBOSE |
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|
2742 size_t old_predicted_bytes_to_copy = hr->predicted_bytes_to_copy(); |
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|
2743 _inc_cset_predicted_bytes_to_copy -= old_predicted_bytes_to_copy; |
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|
2744 |
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diff
changeset
|
2745 // Subtract the number of bytes used in this region |
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changeset
|
2746 _inc_cset_recorded_young_bytes -= used_bytes; |
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|
2747 |
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|
2748 // Clear the values cached in the heap region |
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|
2749 hr->set_predicted_bytes_to_copy(0); |
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|
2750 #endif // PREDICTIONS_VERBOSE |
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|
2751 } |
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|
2752 |
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|
2753 void G1CollectorPolicy::update_incremental_cset_info(HeapRegion* hr, size_t new_rs_length) { |
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|
2754 // Update the collection set information that is dependent on the new RS length |
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|
2755 assert(hr->is_young(), "Precondition"); |
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|
2756 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2757 remove_from_incremental_cset_info(hr); |
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|
2758 add_to_incremental_cset_info(hr, new_rs_length); |
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|
2759 } |
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|
2760 |
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|
2761 void G1CollectorPolicy::add_region_to_incremental_cset_common(HeapRegion* hr) { |
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|
2762 assert( hr->is_young(), "invariant"); |
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|
2763 assert( hr->young_index_in_cset() == -1, "invariant" ); |
1316cec51b4d
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|
2764 assert(_inc_cset_build_state == Active, "Precondition"); |
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|
2765 |
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|
2766 // We need to clear and set the cached recorded/cached collection set |
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|
2767 // information in the heap region here (before the region gets added |
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|
2768 // to the collection set). An individual heap region's cached values |
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2769 // are calculated, aggregated with the policy collection set info, |
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2770 // and cached in the heap region here (initially) and (subsequently) |
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|
2771 // by the Young List sampling code. |
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|
2772 |
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|
2773 size_t rs_length = hr->rem_set()->occupied(); |
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|
2774 add_to_incremental_cset_info(hr, rs_length); |
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|
2775 |
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|
2776 HeapWord* hr_end = hr->end(); |
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|
2777 _inc_cset_max_finger = MAX2(_inc_cset_max_finger, hr_end); |
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|
2778 |
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|
2779 assert(!hr->in_collection_set(), "invariant"); |
1316cec51b4d
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|
2780 hr->set_in_collection_set(true); |
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|
2781 assert( hr->next_in_collection_set() == NULL, "invariant"); |
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|
2782 |
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|
2783 _inc_cset_size++; |
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|
2784 _g1->register_region_with_in_cset_fast_test(hr); |
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|
2785 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2786 hr->set_young_index_in_cset((int) _inc_cset_young_index); |
1316cec51b4d
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|
2787 ++_inc_cset_young_index; |
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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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|
2788 } |
1316cec51b4d
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parents:
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diff
changeset
|
2789 |
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diff
changeset
|
2790 // Add the region at the RHS of the incremental cset |
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|
2791 void G1CollectorPolicy::add_region_to_incremental_cset_rhs(HeapRegion* hr) { |
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|
2792 // We should only ever be appending survivors at the end of a pause |
1316cec51b4d
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|
2793 assert( hr->is_survivor(), "Logic"); |
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|
2794 |
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diff
changeset
|
2795 // Do the 'common' stuff |
1316cec51b4d
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changeset
|
2796 add_region_to_incremental_cset_common(hr); |
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|
2797 |
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changeset
|
2798 // Now add the region at the right hand side |
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|
2799 if (_inc_cset_tail == NULL) { |
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|
2800 assert(_inc_cset_head == NULL, "invariant"); |
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|
2801 _inc_cset_head = hr; |
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parents:
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|
2802 } else { |
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diff
changeset
|
2803 _inc_cset_tail->set_next_in_collection_set(hr); |
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parents:
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|
2804 } |
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changeset
|
2805 _inc_cset_tail = hr; |
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parents:
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|
2806 } |
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parents:
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diff
changeset
|
2807 |
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diff
changeset
|
2808 // Add the region to the LHS of the incremental cset |
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changeset
|
2809 void G1CollectorPolicy::add_region_to_incremental_cset_lhs(HeapRegion* hr) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2810 // Survivors should be added to the RHS at the end of a pause |
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diff
changeset
|
2811 assert(!hr->is_survivor(), "Logic"); |
1316cec51b4d
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parents:
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diff
changeset
|
2812 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2813 // Do the 'common' stuff |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2814 add_region_to_incremental_cset_common(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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|
2815 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2816 // Add the region at the left hand side |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
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|
2817 hr->set_next_in_collection_set(_inc_cset_head); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2818 if (_inc_cset_head == NULL) { |
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
|
2819 assert(_inc_cset_tail == NULL, "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
|
2820 _inc_cset_tail = 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
|
2821 } |
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
|
2822 _inc_cset_head = 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
|
2823 } |
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
|
2824 |
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
|
2825 #ifndef PRODUCT |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2826 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:
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diff
changeset
|
2827 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
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parents:
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diff
changeset
|
2828 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2829 st->print_cr("\nCollection_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
|
2830 HeapRegion* csr = list_head; |
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
|
2831 while (csr != NULL) { |
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
|
2832 HeapRegion* next = csr->next_in_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
|
2833 assert(csr->in_collection_set(), "bad CS"); |
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
|
2834 st->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2835 "age: %4d, y: %d, surv: %d", |
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
|
2836 csr->bottom(), csr->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
|
2837 csr->top(), |
1316cec51b4d
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diff
changeset
|
2838 csr->prev_top_at_mark_start(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2839 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
|
2840 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
|
2841 csr->age_in_surv_rate_group_cond(), |
1316cec51b4d
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1391
diff
changeset
|
2842 csr->is_young(), |
1316cec51b4d
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diff
changeset
|
2843 csr->is_survivor()); |
1316cec51b4d
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parents:
1391
diff
changeset
|
2844 csr = next; |
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1391
diff
changeset
|
2845 } |
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1391
diff
changeset
|
2846 } |
1316cec51b4d
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parents:
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diff
changeset
|
2847 #endif // !PRODUCT |
1316cec51b4d
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diff
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|
2848 |
1707 | 2849 void |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
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|
2850 G1CollectorPolicy_BestRegionsFirst::choose_collection_set( |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
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|
2851 double target_pause_time_ms) { |
1394
1316cec51b4d
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parents:
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diff
changeset
|
2852 // Set this here - in case we're not doing young collections. |
1316cec51b4d
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parents:
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diff
changeset
|
2853 double non_young_start_time_sec = os::elapsedTime(); |
1316cec51b4d
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diff
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|
2854 |
342 | 2855 start_recording_regions(); |
2856 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
changeset
|
2857 guarantee(target_pause_time_ms > 0.0, |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
changeset
|
2858 err_msg("target_pause_time_ms = %1.6lf should be positive", |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
changeset
|
2859 target_pause_time_ms)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
changeset
|
2860 guarantee(_collection_set == NULL, "Precondition"); |
342 | 2861 |
2862 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
2863 double predicted_pause_time_ms = base_time_ms; | |
2864 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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parents:
1611
diff
changeset
|
2865 double time_remaining_ms = target_pause_time_ms - base_time_ms; |
342 | 2866 |
2867 // the 10% and 50% values are arbitrary... | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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parents:
1611
diff
changeset
|
2868 if (time_remaining_ms < 0.10 * target_pause_time_ms) { |
4e5661ba9d98
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parents:
1611
diff
changeset
|
2869 time_remaining_ms = 0.50 * target_pause_time_ms; |
342 | 2870 _within_target = false; |
2871 } else { | |
2872 _within_target = true; | |
2873 } | |
2874 | |
2875 // We figure out the number of bytes available for future to-space. | |
2876 // For new regions without marking information, we must assume the | |
2877 // worst-case of complete survival. If we have marking information for a | |
2878 // region, we can bound the amount of live data. We can add a number of | |
2879 // such regions, as long as the sum of the live data bounds does not | |
2880 // exceed the available evacuation space. | |
2881 size_t max_live_bytes = _g1->free_regions() * HeapRegion::GrainBytes; | |
2882 | |
2883 size_t expansion_bytes = | |
2884 _g1->expansion_regions() * HeapRegion::GrainBytes; | |
2885 | |
677 | 2886 _collection_set_bytes_used_before = 0; |
2887 _collection_set_size = 0; | |
342 | 2888 |
2889 // Adjust for expansion and slop. | |
2890 max_live_bytes = max_live_bytes + expansion_bytes; | |
2891 | |
2892 HeapRegion* hr; | |
2893 if (in_young_gc_mode()) { | |
2894 double young_start_time_sec = os::elapsedTime(); | |
2895 | |
2896 if (G1PolicyVerbose > 0) { | |
2897 gclog_or_tty->print_cr("Adding %d young regions to the CSet", | |
1394
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2898 _g1->young_list()->length()); |
342 | 2899 } |
1394
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2900 |
342 | 2901 _young_cset_length = 0; |
2902 _last_young_gc_full = full_young_gcs() ? true : false; | |
1394
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2903 |
342 | 2904 if (_last_young_gc_full) |
2905 ++_full_young_pause_num; | |
2906 else | |
2907 ++_partial_young_pause_num; | |
1394
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2908 |
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2909 // The young list is laid with the survivor regions from the previous |
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2910 // pause are appended to the RHS of the young list, i.e. |
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2911 // [Newly Young Regions ++ Survivors from last pause]. |
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2912 |
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2913 hr = _g1->young_list()->first_survivor_region(); |
342 | 2914 while (hr != NULL) { |
1394
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2915 assert(hr->is_survivor(), "badly formed young list"); |
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2916 hr->set_young(); |
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2917 hr = hr->get_next_young_region(); |
342 | 2918 } |
2919 | |
1394
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2920 // Clear the fields that point to the survivor list - they are |
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2921 // all young now. |
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2922 _g1->young_list()->clear_survivors(); |
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2923 |
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2924 if (_g1->mark_in_progress()) |
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2925 _g1->concurrent_mark()->register_collection_set_finger(_inc_cset_max_finger); |
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2926 |
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2927 _young_cset_length = _inc_cset_young_index; |
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2928 _collection_set = _inc_cset_head; |
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2929 _collection_set_size = _inc_cset_size; |
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2930 _collection_set_bytes_used_before = _inc_cset_bytes_used_before; |
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2931 |
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2932 // For young regions in the collection set, we assume the worst |
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2933 // case of complete survival |
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2934 max_live_bytes -= _inc_cset_size * HeapRegion::GrainBytes; |
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2935 |
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2936 time_remaining_ms -= _inc_cset_predicted_elapsed_time_ms; |
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2937 predicted_pause_time_ms += _inc_cset_predicted_elapsed_time_ms; |
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2938 |
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2939 // The number of recorded young regions is the incremental |
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2940 // collection set's current size |
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2941 set_recorded_young_regions(_inc_cset_size); |
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2942 set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths); |
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2943 set_recorded_young_bytes(_inc_cset_recorded_young_bytes); |
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2944 #if PREDICTIONS_VERBOSE |
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2945 set_predicted_bytes_to_copy(_inc_cset_predicted_bytes_to_copy); |
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2946 #endif // PREDICTIONS_VERBOSE |
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2947 |
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2948 if (G1PolicyVerbose > 0) { |
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|
2949 gclog_or_tty->print_cr(" Added " PTR_FORMAT " Young Regions to CS.", |
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|
2950 _inc_cset_size); |
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2951 gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", |
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2952 max_live_bytes/K); |
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|
2953 } |
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|
2954 |
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|
2955 assert(_inc_cset_size == _g1->young_list()->length(), "Invariant"); |
342 | 2956 |
2957 double young_end_time_sec = os::elapsedTime(); | |
2958 _recorded_young_cset_choice_time_ms = | |
2959 (young_end_time_sec - young_start_time_sec) * 1000.0; | |
2960 | |
1394
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2961 // We are doing young collections so reset this. |
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2962 non_young_start_time_sec = young_end_time_sec; |
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|
2963 |
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|
2964 // Note we can use either _collection_set_size or |
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2965 // _young_cset_length here |
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2966 if (_collection_set_size > 0 && _last_young_gc_full) { |
342 | 2967 // don't bother adding more regions... |
2968 goto choose_collection_set_end; | |
2969 } | |
2970 } | |
2971 | |
2972 if (!in_young_gc_mode() || !full_young_gcs()) { | |
2973 bool should_continue = true; | |
2974 NumberSeq seq; | |
2975 double avg_prediction = 100000000000000000.0; // something very large | |
1394
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|
2976 |
342 | 2977 do { |
2978 hr = _collectionSetChooser->getNextMarkedRegion(time_remaining_ms, | |
2979 avg_prediction); | |
677 | 2980 if (hr != NULL) { |
342 | 2981 double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
2982 time_remaining_ms -= predicted_time_ms; | |
2983 predicted_pause_time_ms += predicted_time_ms; | |
2984 add_to_collection_set(hr); | |
1394
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|
2985 record_non_young_cset_region(hr); |
342 | 2986 max_live_bytes -= MIN2(hr->max_live_bytes(), max_live_bytes); |
2987 if (G1PolicyVerbose > 0) { | |
2988 gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", | |
2989 max_live_bytes/K); | |
2990 } | |
2991 seq.add(predicted_time_ms); | |
2992 avg_prediction = seq.avg() + seq.sd(); | |
2993 } | |
2994 should_continue = | |
2995 ( hr != NULL) && | |
2996 ( (adaptive_young_list_length()) ? time_remaining_ms > 0.0 | |
2997 : _collection_set_size < _young_list_fixed_length ); | |
2998 } while (should_continue); | |
2999 | |
3000 if (!adaptive_young_list_length() && | |
3001 _collection_set_size < _young_list_fixed_length) | |
3002 _should_revert_to_full_young_gcs = true; | |
3003 } | |
3004 | |
3005 choose_collection_set_end: | |
1394
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|
3006 stop_incremental_cset_building(); |
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|
3007 |
342 | 3008 count_CS_bytes_used(); |
3009 | |
3010 end_recording_regions(); | |
3011 | |
3012 double non_young_end_time_sec = os::elapsedTime(); | |
3013 _recorded_non_young_cset_choice_time_ms = | |
3014 (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; | |
3015 } | |
3016 | |
3017 void G1CollectorPolicy_BestRegionsFirst::record_full_collection_end() { | |
3018 G1CollectorPolicy::record_full_collection_end(); | |
3019 _collectionSetChooser->updateAfterFullCollection(); | |
3020 } | |
3021 | |
3022 void G1CollectorPolicy_BestRegionsFirst:: | |
3023 expand_if_possible(size_t numRegions) { | |
3024 size_t expansion_bytes = numRegions * HeapRegion::GrainBytes; | |
3025 _g1->expand(expansion_bytes); | |
3026 } | |
3027 | |
3028 void G1CollectorPolicy_BestRegionsFirst:: | |
1707 | 3029 record_collection_pause_end() { |
3030 G1CollectorPolicy::record_collection_pause_end(); | |
342 | 3031 assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end."); |
3032 } |