Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 2430:5c0b591e1074
6948149: G1: Imbalance in termination times
Summary: Changed default value of WorkStealingYieldsBeforeSleep from 1000 to 5000. Added more information to G1 pause logging.
Reviewed-by: jwilhelm, tonyp, jmasa
| author | brutisso |
|---|---|
| date | Wed, 23 Mar 2011 14:12:51 +0100 |
| parents | c93aa6caa02f |
| children | 053d84a76d3d |
| rev | line source |
|---|---|
| 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 | |
|
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84 // Help class for avoiding interleaved logging |
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85 class LineBuffer: public StackObj { |
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86 |
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87 private: |
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88 static const int BUFFER_LEN = 1024; |
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89 static const int INDENT_CHARS = 3; |
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90 char _buffer[BUFFER_LEN]; |
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91 int _indent_level; |
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92 int _cur; |
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93 |
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94 void vappend(const char* format, va_list ap) { |
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95 int res = vsnprintf(&_buffer[_cur], BUFFER_LEN - _cur, format, ap); |
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96 if (res != -1) { |
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97 _cur += res; |
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98 } else { |
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99 DEBUG_ONLY(warning("buffer too small in LineBuffer");) |
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100 _buffer[BUFFER_LEN -1] = 0; |
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101 _cur = BUFFER_LEN; // vsnprintf above should not add to _buffer if we are called again |
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102 } |
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103 } |
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104 |
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105 public: |
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106 explicit LineBuffer(int indent_level): _indent_level(indent_level), _cur(0) { |
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107 for (; (_cur < BUFFER_LEN && _cur < (_indent_level * INDENT_CHARS)); _cur++) { |
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108 _buffer[_cur] = ' '; |
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109 } |
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110 } |
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111 |
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112 #ifndef PRODUCT |
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113 ~LineBuffer() { |
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114 assert(_cur == _indent_level * INDENT_CHARS, "pending data in buffer - append_and_print_cr() not called?"); |
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115 } |
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116 #endif |
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117 |
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118 void append(const char* format, ...) { |
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119 va_list ap; |
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120 va_start(ap, format); |
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121 vappend(format, ap); |
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122 va_end(ap); |
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123 } |
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124 |
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125 void append_and_print_cr(const char* format, ...) { |
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126 va_list ap; |
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127 va_start(ap, format); |
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128 vappend(format, ap); |
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129 va_end(ap); |
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130 gclog_or_tty->print_cr("%s", _buffer); |
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131 _cur = _indent_level * INDENT_CHARS; |
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132 } |
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133 }; |
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134 |
| 342 | 135 G1CollectorPolicy::G1CollectorPolicy() : |
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136 _parallel_gc_threads(G1CollectedHeap::use_parallel_gc_threads() |
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137 ? ParallelGCThreads : 1), |
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138 |
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139 |
| 342 | 140 _n_pauses(0), |
| 141 _recent_CH_strong_roots_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 142 _recent_G1_strong_roots_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 143 _recent_evac_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 144 _recent_pause_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 145 _recent_rs_sizes(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 146 _recent_gc_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 147 _all_pause_times_ms(new NumberSeq()), | |
| 148 _stop_world_start(0.0), | |
| 149 _all_stop_world_times_ms(new NumberSeq()), | |
| 150 _all_yield_times_ms(new NumberSeq()), | |
| 151 | |
| 152 _all_mod_union_times_ms(new NumberSeq()), | |
| 153 | |
| 677 | 154 _summary(new Summary()), |
| 342 | 155 |
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156 #ifndef PRODUCT |
| 342 | 157 _cur_clear_ct_time_ms(0.0), |
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158 _min_clear_cc_time_ms(-1.0), |
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159 _max_clear_cc_time_ms(-1.0), |
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160 _cur_clear_cc_time_ms(0.0), |
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161 _cum_clear_cc_time_ms(0.0), |
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162 _num_cc_clears(0L), |
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163 #endif |
| 342 | 164 |
| 165 _region_num_young(0), | |
| 166 _region_num_tenured(0), | |
| 167 _prev_region_num_young(0), | |
| 168 _prev_region_num_tenured(0), | |
| 169 | |
| 170 _aux_num(10), | |
| 171 _all_aux_times_ms(new NumberSeq[_aux_num]), | |
| 172 _cur_aux_start_times_ms(new double[_aux_num]), | |
| 173 _cur_aux_times_ms(new double[_aux_num]), | |
| 174 _cur_aux_times_set(new bool[_aux_num]), | |
| 175 | |
| 176 _concurrent_mark_init_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 177 _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 178 _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 179 | |
| 180 // <NEW PREDICTION> | |
| 181 | |
| 182 _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 183 _prev_collection_pause_end_ms(0.0), | |
| 184 _pending_card_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 185 _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 186 _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 187 _fully_young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 188 _partially_young_cards_per_entry_ratio_seq( | |
| 189 new TruncatedSeq(TruncatedSeqLength)), | |
| 190 _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 191 _partially_young_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 192 _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 193 _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 194 _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 195 _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 196 _non_young_other_cost_per_region_ms_seq( | |
| 197 new TruncatedSeq(TruncatedSeqLength)), | |
| 198 | |
| 199 _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 200 _scanned_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 201 _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 202 | |
| 751 | 203 _pause_time_target_ms((double) MaxGCPauseMillis), |
| 342 | 204 |
| 205 // </NEW PREDICTION> | |
| 206 | |
| 207 _in_young_gc_mode(false), | |
| 208 _full_young_gcs(true), | |
| 209 _full_young_pause_num(0), | |
| 210 _partial_young_pause_num(0), | |
| 211 | |
| 212 _during_marking(false), | |
| 213 _in_marking_window(false), | |
| 214 _in_marking_window_im(false), | |
| 215 | |
| 216 _known_garbage_ratio(0.0), | |
| 217 _known_garbage_bytes(0), | |
| 218 | |
| 219 _young_gc_eff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 220 | |
| 221 _recent_prev_end_times_for_all_gcs_sec(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 222 | |
| 223 _recent_CS_bytes_used_before(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 224 _recent_CS_bytes_surviving(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 225 | |
| 226 _recent_avg_pause_time_ratio(0.0), | |
| 227 _num_markings(0), | |
| 228 _n_marks(0), | |
| 229 _n_pauses_at_mark_end(0), | |
| 230 | |
| 231 _all_full_gc_times_ms(new NumberSeq()), | |
| 232 | |
| 233 // G1PausesBtwnConcMark defaults to -1 | |
| 234 // so the hack is to do the cast QQQ FIXME | |
| 235 _pauses_btwn_concurrent_mark((size_t)G1PausesBtwnConcMark), | |
| 236 _n_marks_since_last_pause(0), | |
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237 _initiate_conc_mark_if_possible(false), |
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238 _during_initial_mark_pause(false), |
| 342 | 239 _should_revert_to_full_young_gcs(false), |
| 240 _last_full_young_gc(false), | |
| 241 | |
| 242 _prev_collection_pause_used_at_end_bytes(0), | |
| 243 | |
| 244 _collection_set(NULL), | |
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245 _collection_set_size(0), |
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246 _collection_set_bytes_used_before(0), |
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247 |
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248 // Incremental CSet attributes |
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249 _inc_cset_build_state(Inactive), |
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250 _inc_cset_head(NULL), |
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251 _inc_cset_tail(NULL), |
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252 _inc_cset_size(0), |
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253 _inc_cset_young_index(0), |
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254 _inc_cset_bytes_used_before(0), |
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255 _inc_cset_max_finger(NULL), |
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256 _inc_cset_recorded_young_bytes(0), |
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257 _inc_cset_recorded_rs_lengths(0), |
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258 _inc_cset_predicted_elapsed_time_ms(0.0), |
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259 _inc_cset_predicted_bytes_to_copy(0), |
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260 |
| 342 | 261 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
| 262 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 263 #endif // _MSC_VER | |
| 264 | |
| 265 _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", | |
| 266 G1YoungSurvRateNumRegionsSummary)), | |
| 267 _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", | |
| 545 | 268 G1YoungSurvRateNumRegionsSummary)), |
| 342 | 269 // add here any more surv rate groups |
| 545 | 270 _recorded_survivor_regions(0), |
| 271 _recorded_survivor_head(NULL), | |
| 272 _recorded_survivor_tail(NULL), | |
| 1356 | 273 _survivors_age_table(true), |
| 274 | |
| 275 _gc_overhead_perc(0.0) | |
| 545 | 276 |
| 342 | 277 { |
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278 // Set up the region size and associated fields. Given that the |
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279 // policy is created before the heap, we have to set this up here, |
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280 // so it's done as soon as possible. |
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281 HeapRegion::setup_heap_region_size(Arguments::min_heap_size()); |
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282 HeapRegionRemSet::setup_remset_size(); |
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283 |
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284 // Verify PLAB sizes |
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285 const uint region_size = HeapRegion::GrainWords; |
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286 if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
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287 char buffer[128]; |
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288 jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most %u", |
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289 OldPLABSize > region_size ? "Old" : "Young", region_size); |
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290 vm_exit_during_initialization(buffer); |
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291 } |
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292 |
| 342 | 293 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
| 294 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
| 295 | |
| 1611 | 296 _par_last_gc_worker_start_times_ms = new double[_parallel_gc_threads]; |
| 342 | 297 _par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads]; |
| 298 _par_last_mark_stack_scan_times_ms = new double[_parallel_gc_threads]; | |
| 299 | |
| 300 _par_last_update_rs_times_ms = new double[_parallel_gc_threads]; | |
| 301 _par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; | |
| 302 | |
| 303 _par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; | |
| 304 | |
| 305 _par_last_obj_copy_times_ms = new double[_parallel_gc_threads]; | |
| 306 | |
| 307 _par_last_termination_times_ms = new double[_parallel_gc_threads]; | |
| 1611 | 308 _par_last_termination_attempts = new double[_parallel_gc_threads]; |
| 309 _par_last_gc_worker_end_times_ms = new double[_parallel_gc_threads]; | |
| 2430 | 310 _par_last_gc_worker_times_ms = new double[_parallel_gc_threads]; |
| 342 | 311 |
| 312 // start conservatively | |
| 751 | 313 _expensive_region_limit_ms = 0.5 * (double) MaxGCPauseMillis; |
| 342 | 314 |
| 315 // <NEW PREDICTION> | |
| 316 | |
| 317 int index; | |
| 318 if (ParallelGCThreads == 0) | |
| 319 index = 0; | |
| 320 else if (ParallelGCThreads > 8) | |
| 321 index = 7; | |
| 322 else | |
| 323 index = ParallelGCThreads - 1; | |
| 324 | |
| 325 _pending_card_diff_seq->add(0.0); | |
| 326 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
| 327 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
| 328 _fully_young_cards_per_entry_ratio_seq->add( | |
| 329 fully_young_cards_per_entry_ratio_defaults[index]); | |
| 330 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); | |
| 331 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
| 332 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
| 333 _young_other_cost_per_region_ms_seq->add( | |
| 334 young_other_cost_per_region_ms_defaults[index]); | |
| 335 _non_young_other_cost_per_region_ms_seq->add( | |
| 336 non_young_other_cost_per_region_ms_defaults[index]); | |
| 337 | |
| 338 // </NEW PREDICTION> | |
| 339 | |
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340 // Below, we might need to calculate the pause time target based on |
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341 // the pause interval. When we do so we are going to give G1 maximum |
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342 // flexibility and allow it to do pauses when it needs to. So, we'll |
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343 // arrange that the pause interval to be pause time target + 1 to |
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344 // ensure that a) the pause time target is maximized with respect to |
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345 // the pause interval and b) we maintain the invariant that pause |
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346 // time target < pause interval. If the user does not want this |
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347 // maximum flexibility, they will have to set the pause interval |
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348 // explicitly. |
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349 |
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350 // First make sure that, if either parameter is set, its value is |
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351 // reasonable. |
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352 if (!FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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353 if (MaxGCPauseMillis < 1) { |
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354 vm_exit_during_initialization("MaxGCPauseMillis should be " |
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355 "greater than 0"); |
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356 } |
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357 } |
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358 if (!FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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359 if (GCPauseIntervalMillis < 1) { |
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360 vm_exit_during_initialization("GCPauseIntervalMillis should be " |
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361 "greater than 0"); |
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362 } |
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363 } |
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364 |
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365 // Then, if the pause time target parameter was not set, set it to |
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366 // the default value. |
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367 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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368 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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369 // The default pause time target in G1 is 200ms |
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370 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); |
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371 } else { |
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372 // We do not allow the pause interval to be set without the |
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373 // pause time target |
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374 vm_exit_during_initialization("GCPauseIntervalMillis cannot be set " |
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375 "without setting MaxGCPauseMillis"); |
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376 } |
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377 } |
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378 |
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379 // Then, if the interval parameter was not set, set it according to |
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380 // the pause time target (this will also deal with the case when the |
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381 // pause time target is the default value). |
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382 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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383 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); |
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384 } |
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385 |
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386 // Finally, make sure that the two parameters are consistent. |
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387 if (MaxGCPauseMillis >= GCPauseIntervalMillis) { |
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388 char buffer[256]; |
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389 jio_snprintf(buffer, 256, |
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390 "MaxGCPauseMillis (%u) should be less than " |
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391 "GCPauseIntervalMillis (%u)", |
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392 MaxGCPauseMillis, GCPauseIntervalMillis); |
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393 vm_exit_during_initialization(buffer); |
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394 } |
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395 |
| 751 | 396 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; |
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397 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
| 342 | 398 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); |
| 751 | 399 _sigma = (double) G1ConfidencePercent / 100.0; |
| 342 | 400 |
| 401 // start conservatively (around 50ms is about right) | |
| 402 _concurrent_mark_init_times_ms->add(0.05); | |
| 403 _concurrent_mark_remark_times_ms->add(0.05); | |
| 404 _concurrent_mark_cleanup_times_ms->add(0.20); | |
| 405 _tenuring_threshold = MaxTenuringThreshold; | |
| 406 | |
| 1282 | 407 // if G1FixedSurvivorSpaceSize is 0 which means the size is not |
| 408 // fixed, then _max_survivor_regions will be calculated at | |
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409 // calculate_young_list_target_length during initialization |
| 1282 | 410 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
| 545 | 411 |
| 1356 | 412 assert(GCTimeRatio > 0, |
| 413 "we should have set it to a default value set_g1_gc_flags() " | |
| 414 "if a user set it to 0"); | |
| 415 _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); | |
| 416 | |
| 342 | 417 initialize_all(); |
| 418 } | |
| 419 | |
| 420 // Increment "i", mod "len" | |
| 421 static void inc_mod(int& i, int len) { | |
| 422 i++; if (i == len) i = 0; | |
| 423 } | |
| 424 | |
| 425 void G1CollectorPolicy::initialize_flags() { | |
| 426 set_min_alignment(HeapRegion::GrainBytes); | |
| 427 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
|
547
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428 if (SurvivorRatio < 1) { |
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429 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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430 } |
| 342 | 431 CollectorPolicy::initialize_flags(); |
| 432 } | |
| 433 | |
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434 // The easiest way to deal with the parsing of the NewSize / |
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435 // MaxNewSize / etc. parameteres is to re-use the code in the |
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436 // TwoGenerationCollectorPolicy class. This is similar to what |
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437 // ParallelScavenge does with its GenerationSizer class (see |
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438 // ParallelScavengeHeap::initialize()). We might change this in the |
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439 // future, but it's a good start. |
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440 class G1YoungGenSizer : public TwoGenerationCollectorPolicy { |
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441 size_t size_to_region_num(size_t byte_size) { |
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442 return MAX2((size_t) 1, byte_size / HeapRegion::GrainBytes); |
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443 } |
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444 |
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445 public: |
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446 G1YoungGenSizer() { |
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447 initialize_flags(); |
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448 initialize_size_info(); |
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449 } |
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450 |
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451 size_t min_young_region_num() { |
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452 return size_to_region_num(_min_gen0_size); |
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453 } |
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454 size_t initial_young_region_num() { |
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455 return size_to_region_num(_initial_gen0_size); |
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456 } |
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457 size_t max_young_region_num() { |
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458 return size_to_region_num(_max_gen0_size); |
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459 } |
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460 }; |
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461 |
| 342 | 462 void G1CollectorPolicy::init() { |
| 463 // Set aside an initial future to_space. | |
| 464 _g1 = G1CollectedHeap::heap(); | |
| 465 | |
| 466 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
| 467 | |
| 545 | 468 initialize_gc_policy_counters(); |
| 469 | |
| 342 | 470 if (G1Gen) { |
| 471 _in_young_gc_mode = true; | |
| 472 | |
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473 G1YoungGenSizer sizer; |
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474 size_t initial_region_num = sizer.initial_young_region_num(); |
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475 |
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476 if (UseAdaptiveSizePolicy) { |
| 342 | 477 set_adaptive_young_list_length(true); |
| 478 _young_list_fixed_length = 0; | |
| 479 } else { | |
| 480 set_adaptive_young_list_length(false); | |
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481 _young_list_fixed_length = initial_region_num; |
| 342 | 482 } |
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483 _free_regions_at_end_of_collection = _g1->free_regions(); |
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484 calculate_young_list_min_length(); |
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485 guarantee( _young_list_min_length == 0, "invariant, not enough info" ); |
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486 calculate_young_list_target_length(); |
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487 } else { |
| 342 | 488 _young_list_fixed_length = 0; |
| 489 _in_young_gc_mode = false; | |
| 490 } | |
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491 |
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492 // We may immediately start allocating regions and placing them on the |
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493 // collection set list. Initialize the per-collection set info |
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494 start_incremental_cset_building(); |
| 342 | 495 } |
| 496 | |
| 545 | 497 // Create the jstat counters for the policy. |
| 498 void G1CollectorPolicy::initialize_gc_policy_counters() | |
| 499 { | |
| 500 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 2 + G1Gen); | |
| 501 } | |
| 502 | |
| 342 | 503 void G1CollectorPolicy::calculate_young_list_min_length() { |
| 504 _young_list_min_length = 0; | |
| 505 | |
| 506 if (!adaptive_young_list_length()) | |
| 507 return; | |
| 508 | |
| 509 if (_alloc_rate_ms_seq->num() > 3) { | |
| 510 double now_sec = os::elapsedTime(); | |
| 511 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; | |
| 512 double alloc_rate_ms = predict_alloc_rate_ms(); | |
| 1973 | 513 size_t min_regions = (size_t) ceil(alloc_rate_ms * when_ms); |
| 514 size_t current_region_num = _g1->young_list()->length(); | |
| 342 | 515 _young_list_min_length = min_regions + current_region_num; |
| 516 } | |
| 517 } | |
| 518 | |
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519 void G1CollectorPolicy::calculate_young_list_target_length() { |
| 342 | 520 if (adaptive_young_list_length()) { |
| 521 size_t rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); | |
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522 calculate_young_list_target_length(rs_lengths); |
| 342 | 523 } else { |
| 524 if (full_young_gcs()) | |
| 525 _young_list_target_length = _young_list_fixed_length; | |
| 526 else | |
| 527 _young_list_target_length = _young_list_fixed_length / 2; | |
| 528 } | |
| 1973 | 529 |
| 530 // Make sure we allow the application to allocate at least one | |
| 531 // region before we need to do a collection again. | |
| 532 size_t min_length = _g1->young_list()->length() + 1; | |
| 533 _young_list_target_length = MAX2(_young_list_target_length, min_length); | |
|
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534 calculate_max_gc_locker_expansion(); |
| 545 | 535 calculate_survivors_policy(); |
| 342 | 536 } |
| 537 | |
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538 void G1CollectorPolicy::calculate_young_list_target_length(size_t rs_lengths) { |
| 342 | 539 guarantee( adaptive_young_list_length(), "pre-condition" ); |
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540 guarantee( !_in_marking_window || !_last_full_young_gc, "invariant" ); |
| 342 | 541 |
| 542 double start_time_sec = os::elapsedTime(); | |
| 1282 | 543 size_t min_reserve_perc = MAX2((size_t)2, (size_t)G1ReservePercent); |
| 342 | 544 min_reserve_perc = MIN2((size_t) 50, min_reserve_perc); |
| 545 size_t reserve_regions = | |
| 546 (size_t) ((double) min_reserve_perc * (double) _g1->n_regions() / 100.0); | |
| 547 | |
| 548 if (full_young_gcs() && _free_regions_at_end_of_collection > 0) { | |
| 549 // we are in fully-young mode and there are free regions in the heap | |
| 550 | |
| 545 | 551 double survivor_regions_evac_time = |
| 552 predict_survivor_regions_evac_time(); | |
| 553 | |
| 342 | 554 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
| 555 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); | |
| 556 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); | |
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557 size_t scanned_cards = predict_young_card_num(adj_rs_lengths); |
| 545 | 558 double base_time_ms = predict_base_elapsed_time_ms(pending_cards, scanned_cards) |
| 559 + survivor_regions_evac_time; | |
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560 |
| 342 | 561 // the result |
| 562 size_t final_young_length = 0; | |
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563 |
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564 size_t init_free_regions = |
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565 MAX2((size_t)0, _free_regions_at_end_of_collection - reserve_regions); |
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566 |
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567 // if we're still under the pause target... |
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568 if (base_time_ms <= target_pause_time_ms) { |
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569 // We make sure that the shortest young length that makes sense |
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570 // fits within the target pause time. |
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571 size_t min_young_length = 1; |
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572 |
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573 if (predict_will_fit(min_young_length, base_time_ms, |
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574 init_free_regions, target_pause_time_ms)) { |
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575 // The shortest young length will fit within the target pause time; |
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576 // we'll now check whether the absolute maximum number of young |
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577 // regions will fit in the target pause time. If not, we'll do |
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578 // a binary search between min_young_length and max_young_length |
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579 size_t abs_max_young_length = _free_regions_at_end_of_collection - 1; |
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580 size_t max_young_length = abs_max_young_length; |
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581 |
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582 if (max_young_length > min_young_length) { |
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583 // Let's check if the initial max young length will fit within the |
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584 // target pause. If so then there is no need to search for a maximal |
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585 // young length - we'll return the initial maximum |
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586 |
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587 if (predict_will_fit(max_young_length, base_time_ms, |
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588 init_free_regions, target_pause_time_ms)) { |
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589 // The maximum young length will satisfy the target pause time. |
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590 // We are done so set min young length to this maximum length. |
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591 // The code after the loop will then set final_young_length using |
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592 // the value cached in the minimum length. |
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593 min_young_length = max_young_length; |
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594 } else { |
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595 // The maximum possible number of young regions will not fit within |
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596 // the target pause time so let's search.... |
| 342 | 597 |
| 598 size_t diff = (max_young_length - min_young_length) / 2; | |
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599 max_young_length = min_young_length + diff; |
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600 |
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601 while (max_young_length > min_young_length) { |
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602 if (predict_will_fit(max_young_length, base_time_ms, |
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603 init_free_regions, target_pause_time_ms)) { |
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604 |
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605 // The current max young length will fit within the target |
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606 // pause time. Note we do not exit the loop here. By setting |
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607 // min = max, and then increasing the max below means that |
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608 // we will continue searching for an upper bound in the |
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609 // range [max..max+diff] |
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610 min_young_length = max_young_length; |
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611 } |
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612 diff = (max_young_length - min_young_length) / 2; |
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613 max_young_length = min_young_length + diff; |
| 342 | 614 } |
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615 // the above loop found a maximal young length that will fit |
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616 // within the target pause time. |
| 342 | 617 } |
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618 assert(min_young_length <= abs_max_young_length, "just checking"); |
| 342 | 619 } |
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620 final_young_length = min_young_length; |
| 342 | 621 } |
| 622 } | |
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623 // and we're done! |
| 342 | 624 |
| 625 // we should have at least one region in the target young length | |
| 545 | 626 _young_list_target_length = |
| 1973 | 627 final_young_length + _recorded_survivor_regions; |
| 342 | 628 |
| 629 // let's keep an eye of how long we spend on this calculation | |
| 630 // right now, I assume that we'll print it when we need it; we | |
| 631 // should really adde it to the breakdown of a pause | |
| 632 double end_time_sec = os::elapsedTime(); | |
| 633 double elapsed_time_ms = (end_time_sec - start_time_sec) * 1000.0; | |
| 634 | |
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635 #ifdef TRACE_CALC_YOUNG_LENGTH |
| 342 | 636 // leave this in for debugging, just in case |
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637 gclog_or_tty->print_cr("target = %1.1lf ms, young = " SIZE_FORMAT ", " |
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638 "elapsed %1.2lf ms, (%s%s) " SIZE_FORMAT SIZE_FORMAT, |
| 342 | 639 target_pause_time_ms, |
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640 _young_list_target_length |
| 342 | 641 elapsed_time_ms, |
| 642 full_young_gcs() ? "full" : "partial", | |
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643 during_initial_mark_pause() ? " i-m" : "", |
| 545 | 644 _in_marking_window, |
| 645 _in_marking_window_im); | |
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646 #endif // TRACE_CALC_YOUNG_LENGTH |
| 342 | 647 |
| 648 if (_young_list_target_length < _young_list_min_length) { | |
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649 // bummer; this means that, if we do a pause when the maximal |
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650 // length dictates, we'll violate the pause spacing target (the |
| 342 | 651 // min length was calculate based on the application's current |
| 652 // alloc rate); | |
| 653 | |
| 654 // so, we have to bite the bullet, and allocate the minimum | |
| 655 // number. We'll violate our target, but we just can't meet it. | |
| 656 | |
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657 #ifdef TRACE_CALC_YOUNG_LENGTH |
| 342 | 658 // leave this in for debugging, just in case |
| 659 gclog_or_tty->print_cr("adjusted target length from " | |
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660 SIZE_FORMAT " to " SIZE_FORMAT, |
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661 _young_list_target_length, _young_list_min_length); |
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662 #endif // TRACE_CALC_YOUNG_LENGTH |
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663 |
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664 _young_list_target_length = _young_list_min_length; |
| 342 | 665 } |
| 666 } else { | |
| 667 // we are in a partially-young mode or we've run out of regions (due | |
| 668 // to evacuation failure) | |
| 669 | |
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670 #ifdef TRACE_CALC_YOUNG_LENGTH |
| 342 | 671 // leave this in for debugging, just in case |
| 672 gclog_or_tty->print_cr("(partial) setting target to " SIZE_FORMAT | |
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673 _young_list_min_length); |
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674 #endif // TRACE_CALC_YOUNG_LENGTH |
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675 // we'll do the pause as soon as possible by choosing the minimum |
| 1973 | 676 _young_list_target_length = _young_list_min_length; |
| 342 | 677 } |
| 678 | |
| 679 _rs_lengths_prediction = rs_lengths; | |
| 680 } | |
| 681 | |
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682 // This is used by: calculate_young_list_target_length(rs_length). It |
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683 // returns true iff: |
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684 // the predicted pause time for the given young list will not overflow |
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685 // the target pause time |
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686 // and: |
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687 // the predicted amount of surviving data will not overflow the |
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688 // the amount of free space available for survivor regions. |
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689 // |
| 342 | 690 bool |
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691 G1CollectorPolicy::predict_will_fit(size_t young_length, |
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692 double base_time_ms, |
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693 size_t init_free_regions, |
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694 double target_pause_time_ms) { |
| 342 | 695 |
| 696 if (young_length >= init_free_regions) | |
| 697 // end condition 1: not enough space for the young regions | |
| 698 return false; | |
| 699 | |
| 700 double accum_surv_rate_adj = 0.0; | |
| 701 double accum_surv_rate = | |
| 702 accum_yg_surv_rate_pred((int)(young_length - 1)) - accum_surv_rate_adj; | |
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703 |
| 342 | 704 size_t bytes_to_copy = |
| 705 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); | |
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706 |
| 342 | 707 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
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708 |
| 342 | 709 double young_other_time_ms = |
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710 predict_young_other_time_ms(young_length); |
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711 |
| 342 | 712 double pause_time_ms = |
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713 base_time_ms + copy_time_ms + young_other_time_ms; |
| 342 | 714 |
| 715 if (pause_time_ms > target_pause_time_ms) | |
| 716 // end condition 2: over the target pause time | |
| 717 return false; | |
| 718 | |
| 719 size_t free_bytes = | |
| 720 (init_free_regions - young_length) * HeapRegion::GrainBytes; | |
| 721 | |
| 722 if ((2.0 + sigma()) * (double) bytes_to_copy > (double) free_bytes) | |
| 723 // end condition 3: out of to-space (conservatively) | |
| 724 return false; | |
| 725 | |
| 726 // success! | |
| 727 return true; | |
| 728 } | |
| 729 | |
| 545 | 730 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
| 731 double survivor_regions_evac_time = 0.0; | |
| 732 for (HeapRegion * r = _recorded_survivor_head; | |
| 733 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
| 734 r = r->get_next_young_region()) { | |
| 735 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); | |
| 736 } | |
| 737 return survivor_regions_evac_time; | |
| 738 } | |
| 739 | |
| 342 | 740 void G1CollectorPolicy::check_prediction_validity() { |
| 741 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); | |
| 742 | |
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743 size_t rs_lengths = _g1->young_list()->sampled_rs_lengths(); |
| 342 | 744 if (rs_lengths > _rs_lengths_prediction) { |
| 745 // add 10% to avoid having to recalculate often | |
| 746 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
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747 calculate_young_list_target_length(rs_lengths_prediction); |
| 342 | 748 } |
| 749 } | |
| 750 | |
| 751 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, | |
| 752 bool is_tlab, | |
| 753 bool* gc_overhead_limit_was_exceeded) { | |
| 754 guarantee(false, "Not using this policy feature yet."); | |
| 755 return NULL; | |
| 756 } | |
| 757 | |
| 758 // This method controls how a collector handles one or more | |
| 759 // of its generations being fully allocated. | |
| 760 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
| 761 bool is_tlab) { | |
| 762 guarantee(false, "Not using this policy feature yet."); | |
| 763 return NULL; | |
| 764 } | |
| 765 | |
| 766 | |
| 767 #ifndef PRODUCT | |
| 768 bool G1CollectorPolicy::verify_young_ages() { | |
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769 HeapRegion* head = _g1->young_list()->first_region(); |
| 342 | 770 return |
| 771 verify_young_ages(head, _short_lived_surv_rate_group); | |
| 772 // also call verify_young_ages on any additional surv rate groups | |
| 773 } | |
| 774 | |
| 775 bool | |
| 776 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
| 777 SurvRateGroup *surv_rate_group) { | |
| 778 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
| 779 | |
| 780 const char* name = surv_rate_group->name(); | |
| 781 bool ret = true; | |
| 782 int prev_age = -1; | |
| 783 | |
| 784 for (HeapRegion* curr = head; | |
| 785 curr != NULL; | |
| 786 curr = curr->get_next_young_region()) { | |
| 787 SurvRateGroup* group = curr->surv_rate_group(); | |
| 788 if (group == NULL && !curr->is_survivor()) { | |
| 789 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
| 790 ret = false; | |
| 791 } | |
| 792 | |
| 793 if (surv_rate_group == group) { | |
| 794 int age = curr->age_in_surv_rate_group(); | |
| 795 | |
| 796 if (age < 0) { | |
| 797 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
| 798 ret = false; | |
| 799 } | |
| 800 | |
| 801 if (age <= prev_age) { | |
| 802 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
| 803 "(%d, %d)", name, age, prev_age); | |
| 804 ret = false; | |
| 805 } | |
| 806 prev_age = age; | |
| 807 } | |
| 808 } | |
| 809 | |
| 810 return ret; | |
| 811 } | |
| 812 #endif // PRODUCT | |
| 813 | |
| 814 void G1CollectorPolicy::record_full_collection_start() { | |
| 815 _cur_collection_start_sec = os::elapsedTime(); | |
| 816 // Release the future to-space so that it is available for compaction into. | |
| 817 _g1->set_full_collection(); | |
| 818 } | |
| 819 | |
| 820 void G1CollectorPolicy::record_full_collection_end() { | |
| 821 // Consider this like a collection pause for the purposes of allocation | |
| 822 // since last pause. | |
| 823 double end_sec = os::elapsedTime(); | |
| 824 double full_gc_time_sec = end_sec - _cur_collection_start_sec; | |
| 825 double full_gc_time_ms = full_gc_time_sec * 1000.0; | |
| 826 | |
| 827 _all_full_gc_times_ms->add(full_gc_time_ms); | |
| 828 | |
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829 update_recent_gc_times(end_sec, full_gc_time_ms); |
| 342 | 830 |
| 831 _g1->clear_full_collection(); | |
| 832 | |
| 833 // "Nuke" the heuristics that control the fully/partially young GC | |
| 834 // transitions and make sure we start with fully young GCs after the | |
| 835 // Full GC. | |
| 836 set_full_young_gcs(true); | |
| 837 _last_full_young_gc = false; | |
| 838 _should_revert_to_full_young_gcs = false; | |
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839 clear_initiate_conc_mark_if_possible(); |
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840 clear_during_initial_mark_pause(); |
| 342 | 841 _known_garbage_bytes = 0; |
| 842 _known_garbage_ratio = 0.0; | |
| 843 _in_marking_window = false; | |
| 844 _in_marking_window_im = false; | |
| 845 | |
| 846 _short_lived_surv_rate_group->start_adding_regions(); | |
| 847 // also call this on any additional surv rate groups | |
| 848 | |
| 545 | 849 record_survivor_regions(0, NULL, NULL); |
| 850 | |
| 342 | 851 _prev_region_num_young = _region_num_young; |
| 852 _prev_region_num_tenured = _region_num_tenured; | |
| 853 | |
| 854 _free_regions_at_end_of_collection = _g1->free_regions(); | |
| 545 | 855 // Reset survivors SurvRateGroup. |
| 856 _survivor_surv_rate_group->reset(); | |
| 342 | 857 calculate_young_list_min_length(); |
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858 calculate_young_list_target_length(); |
| 1973 | 859 } |
| 342 | 860 |
| 861 void G1CollectorPolicy::record_before_bytes(size_t bytes) { | |
| 862 _bytes_in_to_space_before_gc += bytes; | |
| 863 } | |
| 864 | |
| 865 void G1CollectorPolicy::record_after_bytes(size_t bytes) { | |
| 866 _bytes_in_to_space_after_gc += bytes; | |
| 867 } | |
| 868 | |
| 869 void G1CollectorPolicy::record_stop_world_start() { | |
| 870 _stop_world_start = os::elapsedTime(); | |
| 871 } | |
| 872 | |
| 873 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, | |
| 874 size_t start_used) { | |
| 875 if (PrintGCDetails) { | |
| 876 gclog_or_tty->stamp(PrintGCTimeStamps); | |
| 877 gclog_or_tty->print("[GC pause"); | |
| 878 if (in_young_gc_mode()) | |
| 879 gclog_or_tty->print(" (%s)", full_young_gcs() ? "young" : "partial"); | |
| 880 } | |
| 881 | |
| 1973 | 882 assert(_g1->used() == _g1->recalculate_used(), |
| 883 err_msg("sanity, used: "SIZE_FORMAT" recalculate_used: "SIZE_FORMAT, | |
| 884 _g1->used(), _g1->recalculate_used())); | |
| 342 | 885 |
| 886 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
| 887 _all_stop_world_times_ms->add(s_w_t_ms); | |
| 888 _stop_world_start = 0.0; | |
| 889 | |
| 890 _cur_collection_start_sec = start_time_sec; | |
| 891 _cur_collection_pause_used_at_start_bytes = start_used; | |
| 892 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); | |
| 893 _pending_cards = _g1->pending_card_num(); | |
| 894 _max_pending_cards = _g1->max_pending_card_num(); | |
| 895 | |
| 896 _bytes_in_to_space_before_gc = 0; | |
| 897 _bytes_in_to_space_after_gc = 0; | |
| 898 _bytes_in_collection_set_before_gc = 0; | |
| 899 | |
| 900 #ifdef DEBUG | |
| 901 // initialise these to something well known so that we can spot | |
| 902 // if they are not set properly | |
| 903 | |
| 904 for (int i = 0; i < _parallel_gc_threads; ++i) { | |
| 1611 | 905 _par_last_gc_worker_start_times_ms[i] = -1234.0; |
| 906 _par_last_ext_root_scan_times_ms[i] = -1234.0; | |
| 907 _par_last_mark_stack_scan_times_ms[i] = -1234.0; | |
| 908 _par_last_update_rs_times_ms[i] = -1234.0; | |
| 909 _par_last_update_rs_processed_buffers[i] = -1234.0; | |
| 910 _par_last_scan_rs_times_ms[i] = -1234.0; | |
| 911 _par_last_obj_copy_times_ms[i] = -1234.0; | |
| 912 _par_last_termination_times_ms[i] = -1234.0; | |
| 913 _par_last_termination_attempts[i] = -1234.0; | |
| 914 _par_last_gc_worker_end_times_ms[i] = -1234.0; | |
| 2430 | 915 _par_last_gc_worker_times_ms[i] = -1234.0; |
| 342 | 916 } |
| 917 #endif | |
| 918 | |
| 919 for (int i = 0; i < _aux_num; ++i) { | |
| 920 _cur_aux_times_ms[i] = 0.0; | |
| 921 _cur_aux_times_set[i] = false; | |
| 922 } | |
| 923 | |
| 924 _satb_drain_time_set = false; | |
| 925 _last_satb_drain_processed_buffers = -1; | |
| 926 | |
| 927 if (in_young_gc_mode()) | |
| 928 _last_young_gc_full = false; | |
| 929 | |
| 930 // do that for any other surv rate groups | |
| 931 _short_lived_surv_rate_group->stop_adding_regions(); | |
| 1282 | 932 _survivors_age_table.clear(); |
| 545 | 933 |
| 342 | 934 assert( verify_young_ages(), "region age verification" ); |
| 935 } | |
| 936 | |
| 937 void G1CollectorPolicy::record_mark_closure_time(double mark_closure_time_ms) { | |
| 938 _mark_closure_time_ms = mark_closure_time_ms; | |
| 939 } | |
| 940 | |
| 941 void G1CollectorPolicy::record_concurrent_mark_init_start() { | |
| 942 _mark_init_start_sec = os::elapsedTime(); | |
| 943 guarantee(!in_young_gc_mode(), "should not do be here in young GC mode"); | |
| 944 } | |
| 945 | |
| 946 void G1CollectorPolicy::record_concurrent_mark_init_end_pre(double | |
| 947 mark_init_elapsed_time_ms) { | |
| 948 _during_marking = true; | |
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949 assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
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950 clear_during_initial_mark_pause(); |
| 342 | 951 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
| 952 } | |
| 953 | |
| 954 void G1CollectorPolicy::record_concurrent_mark_init_end() { | |
| 955 double end_time_sec = os::elapsedTime(); | |
| 956 double elapsed_time_ms = (end_time_sec - _mark_init_start_sec) * 1000.0; | |
| 957 _concurrent_mark_init_times_ms->add(elapsed_time_ms); | |
| 958 record_concurrent_mark_init_end_pre(elapsed_time_ms); | |
| 959 | |
| 960 _mmu_tracker->add_pause(_mark_init_start_sec, end_time_sec, true); | |
| 961 } | |
| 962 | |
| 963 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
| 964 _mark_remark_start_sec = os::elapsedTime(); | |
| 965 _during_marking = false; | |
| 966 } | |
| 967 | |
| 968 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
| 969 double end_time_sec = os::elapsedTime(); | |
| 970 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
| 971 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
| 972 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
| 973 _prev_collection_pause_end_ms += elapsed_time_ms; | |
| 974 | |
| 975 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
| 976 } | |
| 977 | |
| 978 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
| 979 _mark_cleanup_start_sec = os::elapsedTime(); | |
| 980 } | |
| 981 | |
| 982 void | |
| 983 G1CollectorPolicy::record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
| 984 size_t max_live_bytes) { | |
| 985 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
| 986 record_concurrent_mark_cleanup_end_work2(); | |
| 987 } | |
| 988 | |
| 989 void | |
| 990 G1CollectorPolicy:: | |
| 991 record_concurrent_mark_cleanup_end_work1(size_t freed_bytes, | |
| 992 size_t max_live_bytes) { | |
| 993 if (_n_marks < 2) _n_marks++; | |
| 994 if (G1PolicyVerbose > 0) | |
| 995 gclog_or_tty->print_cr("At end of marking, max_live is " SIZE_FORMAT " MB " | |
| 996 " (of " SIZE_FORMAT " MB heap).", | |
| 997 max_live_bytes/M, _g1->capacity()/M); | |
| 998 } | |
| 999 | |
| 1000 // The important thing about this is that it includes "os::elapsedTime". | |
| 1001 void G1CollectorPolicy::record_concurrent_mark_cleanup_end_work2() { | |
| 1002 double end_time_sec = os::elapsedTime(); | |
| 1003 double elapsed_time_ms = (end_time_sec - _mark_cleanup_start_sec)*1000.0; | |
| 1004 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
| 1005 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
| 1006 _prev_collection_pause_end_ms += elapsed_time_ms; | |
| 1007 | |
| 1008 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_time_sec, true); | |
| 1009 | |
| 1010 _num_markings++; | |
| 1011 | |
| 1012 // We did a marking, so reset the "since_last_mark" variables. | |
| 1013 double considerConcMarkCost = 1.0; | |
| 1014 // If there are available processors, concurrent activity is free... | |
| 1015 if (Threads::number_of_non_daemon_threads() * 2 < | |
| 1016 os::active_processor_count()) { | |
| 1017 considerConcMarkCost = 0.0; | |
| 1018 } | |
| 1019 _n_pauses_at_mark_end = _n_pauses; | |
| 1020 _n_marks_since_last_pause++; | |
| 1021 } | |
| 1022 | |
| 1023 void | |
| 1024 G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { | |
| 1025 if (in_young_gc_mode()) { | |
| 1026 _should_revert_to_full_young_gcs = false; | |
| 1027 _last_full_young_gc = true; | |
| 1028 _in_marking_window = false; | |
| 1029 if (adaptive_young_list_length()) | |
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1030 calculate_young_list_target_length(); |
| 342 | 1031 } |
| 1032 } | |
| 1033 | |
| 1034 void G1CollectorPolicy::record_concurrent_pause() { | |
| 1035 if (_stop_world_start > 0.0) { | |
| 1036 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
| 1037 _all_yield_times_ms->add(yield_ms); | |
| 1038 } | |
| 1039 } | |
| 1040 | |
| 1041 void G1CollectorPolicy::record_concurrent_pause_end() { | |
| 1042 } | |
| 1043 | |
| 1044 void G1CollectorPolicy::record_collection_pause_end_CH_strong_roots() { | |
| 1045 _cur_CH_strong_roots_end_sec = os::elapsedTime(); | |
| 1046 _cur_CH_strong_roots_dur_ms = | |
| 1047 (_cur_CH_strong_roots_end_sec - _cur_collection_start_sec) * 1000.0; | |
| 1048 } | |
| 1049 | |
| 1050 void G1CollectorPolicy::record_collection_pause_end_G1_strong_roots() { | |
| 1051 _cur_G1_strong_roots_end_sec = os::elapsedTime(); | |
| 1052 _cur_G1_strong_roots_dur_ms = | |
| 1053 (_cur_G1_strong_roots_end_sec - _cur_CH_strong_roots_end_sec) * 1000.0; | |
| 1054 } | |
| 1055 | |
| 1056 template<class T> | |
| 1057 T sum_of(T* sum_arr, int start, int n, int N) { | |
| 1058 T sum = (T)0; | |
| 1059 for (int i = 0; i < n; i++) { | |
| 1060 int j = (start + i) % N; | |
| 1061 sum += sum_arr[j]; | |
| 1062 } | |
| 1063 return sum; | |
| 1064 } | |
| 1065 | |
| 1611 | 1066 void G1CollectorPolicy::print_par_stats(int level, |
| 1067 const char* str, | |
| 2430 | 1068 double* data) { |
| 342 | 1069 double min = data[0], max = data[0]; |
| 1070 double total = 0.0; | |
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1071 LineBuffer buf(level); |
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1072 buf.append("[%s (ms):", str); |
| 342 | 1073 for (uint i = 0; i < ParallelGCThreads; ++i) { |
| 1074 double val = data[i]; | |
| 1075 if (val < min) | |
| 1076 min = val; | |
| 1077 if (val > max) | |
| 1078 max = val; | |
| 1079 total += val; | |
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1080 buf.append(" %3.1lf", val); |
| 342 | 1081 } |
| 2430 | 1082 buf.append_and_print_cr(""); |
| 1083 double avg = total / (double) ParallelGCThreads; | |
| 1084 buf.append_and_print_cr(" Avg: %5.1lf, Min: %5.1lf, Max: %5.1lf, Diff: %5.1lf]", | |
| 1085 avg, min, max, max - min); | |
| 342 | 1086 } |
| 1087 | |
| 1611 | 1088 void G1CollectorPolicy::print_par_sizes(int level, |
| 1089 const char* str, | |
| 2430 | 1090 double* data) { |
| 342 | 1091 double min = data[0], max = data[0]; |
| 1092 double total = 0.0; | |
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1093 LineBuffer buf(level); |
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1094 buf.append("[%s :", str); |
| 342 | 1095 for (uint i = 0; i < ParallelGCThreads; ++i) { |
| 1096 double val = data[i]; | |
| 1097 if (val < min) | |
| 1098 min = val; | |
| 1099 if (val > max) | |
| 1100 max = val; | |
| 1101 total += val; | |
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1102 buf.append(" %d", (int) val); |
| 342 | 1103 } |
| 2430 | 1104 buf.append_and_print_cr(""); |
| 1105 double avg = total / (double) ParallelGCThreads; | |
| 1106 buf.append_and_print_cr(" Sum: %d, Avg: %d, Min: %d, Max: %d, Diff: %d]", | |
| 1107 (int)total, (int)avg, (int)min, (int)max, (int)max - (int)min); | |
| 342 | 1108 } |
| 1109 | |
| 1110 void G1CollectorPolicy::print_stats (int level, | |
| 1111 const char* str, | |
| 1112 double value) { | |
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1113 LineBuffer(level).append_and_print_cr("[%s: %5.1lf ms]", str, value); |
| 342 | 1114 } |
| 1115 | |
| 1116 void G1CollectorPolicy::print_stats (int level, | |
| 1117 const char* str, | |
| 1118 int value) { | |
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1119 LineBuffer(level).append_and_print_cr("[%s: %d]", str, value); |
| 342 | 1120 } |
| 1121 | |
| 1122 double G1CollectorPolicy::avg_value (double* data) { | |
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1123 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 1124 double ret = 0.0; |
| 1125 for (uint i = 0; i < ParallelGCThreads; ++i) | |
| 1126 ret += data[i]; | |
| 1127 return ret / (double) ParallelGCThreads; | |
| 1128 } else { | |
| 1129 return data[0]; | |
| 1130 } | |
| 1131 } | |
| 1132 | |
| 1133 double G1CollectorPolicy::max_value (double* data) { | |
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1134 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 1135 double ret = data[0]; |
| 1136 for (uint i = 1; i < ParallelGCThreads; ++i) | |
| 1137 if (data[i] > ret) | |
| 1138 ret = data[i]; | |
| 1139 return ret; | |
| 1140 } else { | |
| 1141 return data[0]; | |
| 1142 } | |
| 1143 } | |
| 1144 | |
| 1145 double G1CollectorPolicy::sum_of_values (double* data) { | |
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1146 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 1147 double sum = 0.0; |
| 1148 for (uint i = 0; i < ParallelGCThreads; i++) | |
| 1149 sum += data[i]; | |
| 1150 return sum; | |
| 1151 } else { | |
| 1152 return data[0]; | |
| 1153 } | |
| 1154 } | |
| 1155 | |
| 1156 double G1CollectorPolicy::max_sum (double* data1, | |
| 1157 double* data2) { | |
| 1158 double ret = data1[0] + data2[0]; | |
| 1159 | |
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1160 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 1161 for (uint i = 1; i < ParallelGCThreads; ++i) { |
| 1162 double data = data1[i] + data2[i]; | |
| 1163 if (data > ret) | |
| 1164 ret = data; | |
| 1165 } | |
| 1166 } | |
| 1167 return ret; | |
| 1168 } | |
| 1169 | |
| 1170 // Anything below that is considered to be zero | |
| 1171 #define MIN_TIMER_GRANULARITY 0.0000001 | |
| 1172 | |
| 1707 | 1173 void G1CollectorPolicy::record_collection_pause_end() { |
| 342 | 1174 double end_time_sec = os::elapsedTime(); |
| 1175 double elapsed_ms = _last_pause_time_ms; | |
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1176 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
| 342 | 1177 double evac_ms = (end_time_sec - _cur_G1_strong_roots_end_sec) * 1000.0; |
| 1178 size_t rs_size = | |
| 1179 _cur_collection_pause_used_regions_at_start - collection_set_size(); | |
| 1180 size_t cur_used_bytes = _g1->used(); | |
| 1181 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
| 1182 bool last_pause_included_initial_mark = false; | |
| 1707 | 1183 bool update_stats = !_g1->evacuation_failed(); |
| 342 | 1184 |
| 1185 #ifndef PRODUCT | |
| 1186 if (G1YoungSurvRateVerbose) { | |
| 1187 gclog_or_tty->print_cr(""); | |
| 1188 _short_lived_surv_rate_group->print(); | |
| 1189 // do that for any other surv rate groups too | |
| 1190 } | |
| 1191 #endif // PRODUCT | |
| 1192 | |
| 1193 if (in_young_gc_mode()) { | |
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1194 last_pause_included_initial_mark = during_initial_mark_pause(); |
| 342 | 1195 if (last_pause_included_initial_mark) |
| 1196 record_concurrent_mark_init_end_pre(0.0); | |
| 1197 | |
| 1198 size_t min_used_targ = | |
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1199 (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
| 342 | 1200 |
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1201 |
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1202 if (!_g1->mark_in_progress() && !_last_full_young_gc) { |
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1203 assert(!last_pause_included_initial_mark, "invariant"); |
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1204 if (cur_used_bytes > min_used_targ && |
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1205 cur_used_bytes > _prev_collection_pause_used_at_end_bytes) { |
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1206 assert(!during_initial_mark_pause(), "we should not see this here"); |
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1207 |
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1208 // Note: this might have already been set, if during the last |
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1209 // pause we decided to start a cycle but at the beginning of |
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1210 // this pause we decided to postpone it. That's OK. |
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1211 set_initiate_conc_mark_if_possible(); |
| 342 | 1212 } |
| 1213 } | |
| 1214 | |
| 1215 _prev_collection_pause_used_at_end_bytes = cur_used_bytes; | |
| 1216 } | |
| 1217 | |
| 1218 _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0, | |
| 1219 end_time_sec, false); | |
| 1220 | |
| 1221 guarantee(_cur_collection_pause_used_regions_at_start >= | |
| 1222 collection_set_size(), | |
| 1223 "Negative RS size?"); | |
| 1224 | |
| 1225 // This assert is exempted when we're doing parallel collection pauses, | |
| 1226 // because the fragmentation caused by the parallel GC allocation buffers | |
| 1227 // can lead to more memory being used during collection than was used | |
| 1228 // before. Best leave this out until the fragmentation problem is fixed. | |
| 1229 // Pauses in which evacuation failed can also lead to negative | |
| 1230 // collections, since no space is reclaimed from a region containing an | |
| 1231 // object whose evacuation failed. | |
| 1232 // Further, we're now always doing parallel collection. But I'm still | |
| 1233 // leaving this here as a placeholder for a more precise assertion later. | |
| 1234 // (DLD, 10/05.) | |
| 1235 assert((true || parallel) // Always using GC LABs now. | |
| 1236 || _g1->evacuation_failed() | |
| 1237 || _cur_collection_pause_used_at_start_bytes >= cur_used_bytes, | |
| 1238 "Negative collection"); | |
| 1239 | |
| 1240 size_t freed_bytes = | |
| 1241 _cur_collection_pause_used_at_start_bytes - cur_used_bytes; | |
| 1242 size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; | |
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1243 |
| 342 | 1244 double survival_fraction = |
| 1245 (double)surviving_bytes/ | |
| 1246 (double)_collection_set_bytes_used_before; | |
| 1247 | |
| 1248 _n_pauses++; | |
| 1249 | |
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1250 if (update_stats) { |
| 342 | 1251 _recent_CH_strong_roots_times_ms->add(_cur_CH_strong_roots_dur_ms); |
| 1252 _recent_G1_strong_roots_times_ms->add(_cur_G1_strong_roots_dur_ms); | |
| 1253 _recent_evac_times_ms->add(evac_ms); | |
| 1254 _recent_pause_times_ms->add(elapsed_ms); | |
| 1255 | |
| 1256 _recent_rs_sizes->add(rs_size); | |
| 1257 | |
| 1258 // We exempt parallel collection from this check because Alloc Buffer | |
| 1259 // fragmentation can produce negative collections. Same with evac | |
| 1260 // failure. | |
| 1261 // Further, we're now always doing parallel collection. But I'm still | |
| 1262 // leaving this here as a placeholder for a more precise assertion later. | |
| 1263 // (DLD, 10/05. | |
| 1264 assert((true || parallel) | |
| 1265 || _g1->evacuation_failed() | |
| 1266 || surviving_bytes <= _collection_set_bytes_used_before, | |
| 1267 "Or else negative collection!"); | |
| 1268 _recent_CS_bytes_used_before->add(_collection_set_bytes_used_before); | |
| 1269 _recent_CS_bytes_surviving->add(surviving_bytes); | |
| 1270 | |
| 1271 // this is where we update the allocation rate of the application | |
| 1272 double app_time_ms = | |
| 1273 (_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms); | |
| 1274 if (app_time_ms < MIN_TIMER_GRANULARITY) { | |
| 1275 // This usually happens due to the timer not having the required | |
| 1276 // granularity. Some Linuxes are the usual culprits. | |
| 1277 // We'll just set it to something (arbitrarily) small. | |
| 1278 app_time_ms = 1.0; | |
| 1279 } | |
| 1280 size_t regions_allocated = | |
| 1281 (_region_num_young - _prev_region_num_young) + | |
| 1282 (_region_num_tenured - _prev_region_num_tenured); | |
| 1283 double alloc_rate_ms = (double) regions_allocated / app_time_ms; | |
| 1284 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
| 1285 _prev_region_num_young = _region_num_young; | |
| 1286 _prev_region_num_tenured = _region_num_tenured; | |
| 1287 | |
| 1288 double interval_ms = | |
| 1289 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
| 1290 update_recent_gc_times(end_time_sec, elapsed_ms); | |
| 1291 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; | |
|
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1292 if (recent_avg_pause_time_ratio() < 0.0 || |
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1293 (recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
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1294 #ifndef PRODUCT |
|
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1295 // Dump info to allow post-facto debugging |
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1296 gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
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1297 gclog_or_tty->print_cr("-------------------------------------------"); |
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1298 gclog_or_tty->print_cr("Recent GC Times (ms):"); |
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1299 _recent_gc_times_ms->dump(); |
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1300 gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
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1301 _recent_prev_end_times_for_all_gcs_sec->dump(); |
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1302 gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
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1303 _recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
|
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1304 // In debug mode, terminate the JVM if the user wants to debug at this point. |
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1305 assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
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1306 #endif // !PRODUCT |
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1307 // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
|
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1308 // CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
|
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1309 if (_recent_avg_pause_time_ratio < 0.0) { |
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1310 _recent_avg_pause_time_ratio = 0.0; |
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1311 } else { |
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1312 assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
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1313 _recent_avg_pause_time_ratio = 1.0; |
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1314 } |
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1315 } |
| 342 | 1316 } |
| 1317 | |
| 1318 if (G1PolicyVerbose > 1) { | |
| 1319 gclog_or_tty->print_cr(" Recording collection pause(%d)", _n_pauses); | |
| 1320 } | |
| 1321 | |
| 1707 | 1322 PauseSummary* summary = _summary; |
| 342 | 1323 |
| 1324 double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); | |
| 1325 double mark_stack_scan_time = avg_value(_par_last_mark_stack_scan_times_ms); | |
| 1326 double update_rs_time = avg_value(_par_last_update_rs_times_ms); | |
| 1327 double update_rs_processed_buffers = | |
| 1328 sum_of_values(_par_last_update_rs_processed_buffers); | |
| 1329 double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); | |
| 1330 double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); | |
| 1331 double termination_time = avg_value(_par_last_termination_times_ms); | |
| 1332 | |
|
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1333 double parallel_other_time = _cur_collection_par_time_ms - |
|
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1334 (update_rs_time + ext_root_scan_time + mark_stack_scan_time + |
|
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1335 scan_rs_time + obj_copy_time + termination_time); |
|
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1336 if (update_stats) { |
| 342 | 1337 MainBodySummary* body_summary = summary->main_body_summary(); |
| 1338 guarantee(body_summary != NULL, "should not be null!"); | |
| 1339 | |
| 1340 if (_satb_drain_time_set) | |
| 1341 body_summary->record_satb_drain_time_ms(_cur_satb_drain_time_ms); | |
| 1342 else | |
| 1343 body_summary->record_satb_drain_time_ms(0.0); | |
| 1344 body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); | |
| 1345 body_summary->record_mark_stack_scan_time_ms(mark_stack_scan_time); | |
| 1346 body_summary->record_update_rs_time_ms(update_rs_time); | |
| 1347 body_summary->record_scan_rs_time_ms(scan_rs_time); | |
| 1348 body_summary->record_obj_copy_time_ms(obj_copy_time); | |
| 1349 if (parallel) { | |
| 1350 body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); | |
| 1351 body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); | |
| 1352 body_summary->record_termination_time_ms(termination_time); | |
| 1353 body_summary->record_parallel_other_time_ms(parallel_other_time); | |
| 1354 } | |
| 1355 body_summary->record_mark_closure_time_ms(_mark_closure_time_ms); | |
| 1356 } | |
| 1357 | |
| 1358 if (G1PolicyVerbose > 1) { | |
| 1359 gclog_or_tty->print_cr(" ET: %10.6f ms (avg: %10.6f ms)\n" | |
| 1360 " CH Strong: %10.6f ms (avg: %10.6f ms)\n" | |
| 1361 " G1 Strong: %10.6f ms (avg: %10.6f ms)\n" | |
| 1362 " Evac: %10.6f ms (avg: %10.6f ms)\n" | |
| 1363 " ET-RS: %10.6f ms (avg: %10.6f ms)\n" | |
| 1364 " |RS|: " SIZE_FORMAT, | |
| 1365 elapsed_ms, recent_avg_time_for_pauses_ms(), | |
| 1366 _cur_CH_strong_roots_dur_ms, recent_avg_time_for_CH_strong_ms(), | |
| 1367 _cur_G1_strong_roots_dur_ms, recent_avg_time_for_G1_strong_ms(), | |
| 1368 evac_ms, recent_avg_time_for_evac_ms(), | |
| 1369 scan_rs_time, | |
| 1370 recent_avg_time_for_pauses_ms() - | |
| 1371 recent_avg_time_for_G1_strong_ms(), | |
| 1372 rs_size); | |
| 1373 | |
| 1374 gclog_or_tty->print_cr(" Used at start: " SIZE_FORMAT"K" | |
| 1375 " At end " SIZE_FORMAT "K\n" | |
| 1376 " garbage : " SIZE_FORMAT "K" | |
| 1377 " of " SIZE_FORMAT "K\n" | |
| 1378 " survival : %6.2f%% (%6.2f%% avg)", | |
| 1379 _cur_collection_pause_used_at_start_bytes/K, | |
| 1380 _g1->used()/K, freed_bytes/K, | |
| 1381 _collection_set_bytes_used_before/K, | |
| 1382 survival_fraction*100.0, | |
| 1383 recent_avg_survival_fraction()*100.0); | |
| 1384 gclog_or_tty->print_cr(" Recent %% gc pause time: %6.2f", | |
| 1385 recent_avg_pause_time_ratio() * 100.0); | |
| 1386 } | |
| 1387 | |
| 1388 double other_time_ms = elapsed_ms; | |
| 1389 | |
| 1707 | 1390 if (_satb_drain_time_set) { |
| 1391 other_time_ms -= _cur_satb_drain_time_ms; | |
| 1392 } | |
| 1393 | |
| 1394 if (parallel) { | |
| 1395 other_time_ms -= _cur_collection_par_time_ms + _cur_clear_ct_time_ms; | |
| 1396 } else { | |
| 1397 other_time_ms -= | |
| 1398 update_rs_time + | |
| 1399 ext_root_scan_time + mark_stack_scan_time + | |
| 1400 scan_rs_time + obj_copy_time; | |
| 342 | 1401 } |
| 1402 | |
| 1403 if (PrintGCDetails) { | |
| 1707 | 1404 gclog_or_tty->print_cr("%s, %1.8lf secs]", |
| 342 | 1405 (last_pause_included_initial_mark) ? " (initial-mark)" : "", |
| 1406 elapsed_ms / 1000.0); | |
| 1407 | |
| 1707 | 1408 if (_satb_drain_time_set) { |
| 1409 print_stats(1, "SATB Drain Time", _cur_satb_drain_time_ms); | |
| 1410 } | |
| 1411 if (_last_satb_drain_processed_buffers >= 0) { | |
| 1412 print_stats(2, "Processed Buffers", _last_satb_drain_processed_buffers); | |
| 1413 } | |
| 1414 if (parallel) { | |
| 1415 print_stats(1, "Parallel Time", _cur_collection_par_time_ms); | |
| 2430 | 1416 print_par_stats(2, "GC Worker Start Time", _par_last_gc_worker_start_times_ms); |
| 1707 | 1417 print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); |
| 2430 | 1418 print_par_sizes(3, "Processed Buffers", _par_last_update_rs_processed_buffers); |
| 1419 print_par_stats(2, "Ext Root Scanning", _par_last_ext_root_scan_times_ms); | |
| 1420 print_par_stats(2, "Mark Stack Scanning", _par_last_mark_stack_scan_times_ms); | |
| 1707 | 1421 print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms); |
| 1422 print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms); | |
| 1423 print_par_stats(2, "Termination", _par_last_termination_times_ms); | |
| 2430 | 1424 print_par_sizes(3, "Termination Attempts", _par_last_termination_attempts); |
| 1425 print_par_stats(2, "GC Worker End Time", _par_last_gc_worker_end_times_ms); | |
| 1426 | |
| 1427 for (int i = 0; i < _parallel_gc_threads; i++) { | |
| 1428 _par_last_gc_worker_times_ms[i] = _par_last_gc_worker_end_times_ms[i] - _par_last_gc_worker_start_times_ms[i]; | |
| 1429 } | |
| 1430 print_par_stats(2, "GC Worker Times", _par_last_gc_worker_times_ms); | |
| 1431 | |
| 1707 | 1432 print_stats(2, "Other", parallel_other_time); |
| 1433 print_stats(1, "Clear CT", _cur_clear_ct_time_ms); | |
| 1434 } else { | |
| 1435 print_stats(1, "Update RS", update_rs_time); | |
| 1436 print_stats(2, "Processed Buffers", | |
| 1437 (int)update_rs_processed_buffers); | |
| 1438 print_stats(1, "Ext Root Scanning", ext_root_scan_time); | |
| 1439 print_stats(1, "Mark Stack Scanning", mark_stack_scan_time); | |
| 1440 print_stats(1, "Scan RS", scan_rs_time); | |
| 1441 print_stats(1, "Object Copying", obj_copy_time); | |
| 342 | 1442 } |
|
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1443 #ifndef PRODUCT |
|
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1444 print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms); |
|
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1445 print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms); |
|
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1446 print_stats(1, "Min Clear CC", _min_clear_cc_time_ms); |
|
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1447 print_stats(1, "Max Clear CC", _max_clear_cc_time_ms); |
|
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1448 if (_num_cc_clears > 0) { |
|
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1449 print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears)); |
|
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1450 } |
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1451 #endif |
| 342 | 1452 print_stats(1, "Other", other_time_ms); |
|
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1453 print_stats(2, "Choose CSet", _recorded_young_cset_choice_time_ms); |
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1454 |
| 342 | 1455 for (int i = 0; i < _aux_num; ++i) { |
| 1456 if (_cur_aux_times_set[i]) { | |
| 1457 char buffer[96]; | |
| 1458 sprintf(buffer, "Aux%d", i); | |
| 1459 print_stats(1, buffer, _cur_aux_times_ms[i]); | |
| 1460 } | |
| 1461 } | |
| 1462 } | |
| 1463 if (PrintGCDetails) | |
| 1464 gclog_or_tty->print(" ["); | |
| 1465 if (PrintGC || PrintGCDetails) | |
| 1466 _g1->print_size_transition(gclog_or_tty, | |
| 1467 _cur_collection_pause_used_at_start_bytes, | |
| 1468 _g1->used(), _g1->capacity()); | |
| 1469 if (PrintGCDetails) | |
| 1470 gclog_or_tty->print_cr("]"); | |
| 1471 | |
| 1472 _all_pause_times_ms->add(elapsed_ms); | |
|
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1473 if (update_stats) { |
|
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1474 summary->record_total_time_ms(elapsed_ms); |
|
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1475 summary->record_other_time_ms(other_time_ms); |
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1476 } |
| 342 | 1477 for (int i = 0; i < _aux_num; ++i) |
| 1478 if (_cur_aux_times_set[i]) | |
| 1479 _all_aux_times_ms[i].add(_cur_aux_times_ms[i]); | |
| 1480 | |
| 1481 // Reset marks-between-pauses counter. | |
| 1482 _n_marks_since_last_pause = 0; | |
| 1483 | |
| 1484 // Update the efficiency-since-mark vars. | |
| 1485 double proc_ms = elapsed_ms * (double) _parallel_gc_threads; | |
| 1486 if (elapsed_ms < MIN_TIMER_GRANULARITY) { | |
| 1487 // This usually happens due to the timer not having the required | |
| 1488 // granularity. Some Linuxes are the usual culprits. | |
| 1489 // We'll just set it to something (arbitrarily) small. | |
| 1490 proc_ms = 1.0; | |
| 1491 } | |
| 1492 double cur_efficiency = (double) freed_bytes / proc_ms; | |
| 1493 | |
| 1494 bool new_in_marking_window = _in_marking_window; | |
| 1495 bool new_in_marking_window_im = false; | |
|
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1496 if (during_initial_mark_pause()) { |
| 342 | 1497 new_in_marking_window = true; |
| 1498 new_in_marking_window_im = true; | |
| 1499 } | |
| 1500 | |
| 1501 if (in_young_gc_mode()) { | |
| 1502 if (_last_full_young_gc) { | |
| 1503 set_full_young_gcs(false); | |
| 1504 _last_full_young_gc = false; | |
| 1505 } | |
| 1506 | |
| 1507 if ( !_last_young_gc_full ) { | |
| 1508 if ( _should_revert_to_full_young_gcs || | |
| 1509 _known_garbage_ratio < 0.05 || | |
| 1510 (adaptive_young_list_length() && | |
| 1511 (get_gc_eff_factor() * cur_efficiency < predict_young_gc_eff())) ) { | |
| 1512 set_full_young_gcs(true); | |
| 1513 } | |
| 1514 } | |
| 1515 _should_revert_to_full_young_gcs = false; | |
| 1516 | |
| 1517 if (_last_young_gc_full && !_during_marking) | |
| 1518 _young_gc_eff_seq->add(cur_efficiency); | |
| 1519 } | |
| 1520 | |
| 1521 _short_lived_surv_rate_group->start_adding_regions(); | |
| 1522 // do that for any other surv rate groupsx | |
| 1523 | |
| 1524 // <NEW PREDICTION> | |
| 1525 | |
| 677 | 1526 if (update_stats) { |
| 342 | 1527 double pause_time_ms = elapsed_ms; |
| 1528 | |
| 1529 size_t diff = 0; | |
| 1530 if (_max_pending_cards >= _pending_cards) | |
| 1531 diff = _max_pending_cards - _pending_cards; | |
| 1532 _pending_card_diff_seq->add((double) diff); | |
| 1533 | |
| 1534 double cost_per_card_ms = 0.0; | |
| 1535 if (_pending_cards > 0) { | |
| 1536 cost_per_card_ms = update_rs_time / (double) _pending_cards; | |
| 1537 _cost_per_card_ms_seq->add(cost_per_card_ms); | |
| 1538 } | |
| 1539 | |
| 1540 size_t cards_scanned = _g1->cards_scanned(); | |
| 1541 | |
| 1542 double cost_per_entry_ms = 0.0; | |
| 1543 if (cards_scanned > 10) { | |
| 1544 cost_per_entry_ms = scan_rs_time / (double) cards_scanned; | |
| 1545 if (_last_young_gc_full) | |
| 1546 _cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
| 1547 else | |
| 1548 _partially_young_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
| 1549 } | |
| 1550 | |
| 1551 if (_max_rs_lengths > 0) { | |
| 1552 double cards_per_entry_ratio = | |
| 1553 (double) cards_scanned / (double) _max_rs_lengths; | |
| 1554 if (_last_young_gc_full) | |
| 1555 _fully_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
| 1556 else | |
| 1557 _partially_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
| 1558 } | |
| 1559 | |
| 1560 size_t rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; | |
| 1561 if (rs_length_diff >= 0) | |
| 1562 _rs_length_diff_seq->add((double) rs_length_diff); | |
| 1563 | |
| 1564 size_t copied_bytes = surviving_bytes; | |
| 1565 double cost_per_byte_ms = 0.0; | |
| 1566 if (copied_bytes > 0) { | |
| 1567 cost_per_byte_ms = obj_copy_time / (double) copied_bytes; | |
| 1568 if (_in_marking_window) | |
| 1569 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); | |
| 1570 else | |
| 1571 _cost_per_byte_ms_seq->add(cost_per_byte_ms); | |
| 1572 } | |
| 1573 | |
| 1574 double all_other_time_ms = pause_time_ms - | |
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1575 (update_rs_time + scan_rs_time + obj_copy_time + |
| 342 | 1576 _mark_closure_time_ms + termination_time); |
| 1577 | |
| 1578 double young_other_time_ms = 0.0; | |
| 1579 if (_recorded_young_regions > 0) { | |
| 1580 young_other_time_ms = | |
| 1581 _recorded_young_cset_choice_time_ms + | |
| 1582 _recorded_young_free_cset_time_ms; | |
| 1583 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / | |
| 1584 (double) _recorded_young_regions); | |
| 1585 } | |
| 1586 double non_young_other_time_ms = 0.0; | |
| 1587 if (_recorded_non_young_regions > 0) { | |
| 1588 non_young_other_time_ms = | |
| 1589 _recorded_non_young_cset_choice_time_ms + | |
| 1590 _recorded_non_young_free_cset_time_ms; | |
| 1591 | |
| 1592 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
| 1593 (double) _recorded_non_young_regions); | |
| 1594 } | |
| 1595 | |
| 1596 double constant_other_time_ms = all_other_time_ms - | |
| 1597 (young_other_time_ms + non_young_other_time_ms); | |
| 1598 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
| 1599 | |
| 1600 double survival_ratio = 0.0; | |
| 1601 if (_bytes_in_collection_set_before_gc > 0) { | |
| 1602 survival_ratio = (double) bytes_in_to_space_during_gc() / | |
| 1603 (double) _bytes_in_collection_set_before_gc; | |
| 1604 } | |
| 1605 | |
| 1606 _pending_cards_seq->add((double) _pending_cards); | |
| 1607 _scanned_cards_seq->add((double) cards_scanned); | |
| 1608 _rs_lengths_seq->add((double) _max_rs_lengths); | |
| 1609 | |
| 1610 double expensive_region_limit_ms = | |
| 751 | 1611 (double) MaxGCPauseMillis - predict_constant_other_time_ms(); |
| 342 | 1612 if (expensive_region_limit_ms < 0.0) { |
| 1613 // this means that the other time was predicted to be longer than | |
| 1614 // than the max pause time | |
| 751 | 1615 expensive_region_limit_ms = (double) MaxGCPauseMillis; |
| 342 | 1616 } |
| 1617 _expensive_region_limit_ms = expensive_region_limit_ms; | |
| 1618 | |
| 1619 if (PREDICTIONS_VERBOSE) { | |
| 1620 gclog_or_tty->print_cr(""); | |
| 1621 gclog_or_tty->print_cr("PREDICTIONS %1.4lf %d " | |
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1622 "REGIONS %d %d %d " |
| 342 | 1623 "PENDING_CARDS %d %d " |
| 1624 "CARDS_SCANNED %d %d " | |
| 1625 "RS_LENGTHS %d %d " | |
| 1626 "RS_UPDATE %1.6lf %1.6lf RS_SCAN %1.6lf %1.6lf " | |
| 1627 "SURVIVAL_RATIO %1.6lf %1.6lf " | |
| 1628 "OBJECT_COPY %1.6lf %1.6lf OTHER_CONSTANT %1.6lf %1.6lf " | |
| 1629 "OTHER_YOUNG %1.6lf %1.6lf " | |
| 1630 "OTHER_NON_YOUNG %1.6lf %1.6lf " | |
| 1631 "VTIME_DIFF %1.6lf TERMINATION %1.6lf " | |
| 1632 "ELAPSED %1.6lf %1.6lf ", | |
| 1633 _cur_collection_start_sec, | |
| 1634 (!_last_young_gc_full) ? 2 : | |
| 1635 (last_pause_included_initial_mark) ? 1 : 0, | |
| 1636 _recorded_region_num, | |
| 1637 _recorded_young_regions, | |
| 1638 _recorded_non_young_regions, | |
| 1639 _predicted_pending_cards, _pending_cards, | |
| 1640 _predicted_cards_scanned, cards_scanned, | |
| 1641 _predicted_rs_lengths, _max_rs_lengths, | |
| 1642 _predicted_rs_update_time_ms, update_rs_time, | |
| 1643 _predicted_rs_scan_time_ms, scan_rs_time, | |
| 1644 _predicted_survival_ratio, survival_ratio, | |
| 1645 _predicted_object_copy_time_ms, obj_copy_time, | |
| 1646 _predicted_constant_other_time_ms, constant_other_time_ms, | |
| 1647 _predicted_young_other_time_ms, young_other_time_ms, | |
| 1648 _predicted_non_young_other_time_ms, | |
| 1649 non_young_other_time_ms, | |
| 1650 _vtime_diff_ms, termination_time, | |
| 1651 _predicted_pause_time_ms, elapsed_ms); | |
| 1652 } | |
| 1653 | |
| 1654 if (G1PolicyVerbose > 0) { | |
| 1655 gclog_or_tty->print_cr("Pause Time, predicted: %1.4lfms (predicted %s), actual: %1.4lfms", | |
| 1656 _predicted_pause_time_ms, | |
| 1657 (_within_target) ? "within" : "outside", | |
| 1658 elapsed_ms); | |
| 1659 } | |
| 1660 | |
| 1661 } | |
| 1662 | |
| 1663 _in_marking_window = new_in_marking_window; | |
| 1664 _in_marking_window_im = new_in_marking_window_im; | |
| 1665 _free_regions_at_end_of_collection = _g1->free_regions(); | |
| 1666 calculate_young_list_min_length(); | |
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1667 calculate_young_list_target_length(); |
| 342 | 1668 |
| 1111 | 1669 // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
| 1282 | 1670 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
| 1111 | 1671 adjust_concurrent_refinement(update_rs_time, update_rs_processed_buffers, update_rs_time_goal_ms); |
| 342 | 1672 // </NEW PREDICTION> |
| 1673 } | |
| 1674 | |
| 1675 // <NEW PREDICTION> | |
| 1676 | |
| 1111 | 1677 void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
| 1678 double update_rs_processed_buffers, | |
| 1679 double goal_ms) { | |
| 1680 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 1681 ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); | |
| 1682 | |
| 1282 | 1683 if (G1UseAdaptiveConcRefinement) { |
| 1111 | 1684 const int k_gy = 3, k_gr = 6; |
| 1685 const double inc_k = 1.1, dec_k = 0.9; | |
| 1686 | |
| 1687 int g = cg1r->green_zone(); | |
| 1688 if (update_rs_time > goal_ms) { | |
| 1689 g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. | |
| 1690 } else { | |
| 1691 if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { | |
| 1692 g = (int)MAX2(g * inc_k, g + 1.0); | |
| 1693 } | |
| 1694 } | |
| 1695 // Change the refinement threads params | |
| 1696 cg1r->set_green_zone(g); | |
| 1697 cg1r->set_yellow_zone(g * k_gy); | |
| 1698 cg1r->set_red_zone(g * k_gr); | |
| 1699 cg1r->reinitialize_threads(); | |
| 1700 | |
| 1701 int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); | |
| 1702 int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, | |
| 1703 cg1r->yellow_zone()); | |
| 1704 // Change the barrier params | |
| 1705 dcqs.set_process_completed_threshold(processing_threshold); | |
| 1706 dcqs.set_max_completed_queue(cg1r->red_zone()); | |
| 1707 } | |
| 1708 | |
| 1709 int curr_queue_size = dcqs.completed_buffers_num(); | |
| 1710 if (curr_queue_size >= cg1r->yellow_zone()) { | |
| 1711 dcqs.set_completed_queue_padding(curr_queue_size); | |
| 1712 } else { | |
| 1713 dcqs.set_completed_queue_padding(0); | |
| 1714 } | |
| 1715 dcqs.notify_if_necessary(); | |
| 1716 } | |
| 1717 | |
| 342 | 1718 double |
| 1719 G1CollectorPolicy:: | |
| 1720 predict_young_collection_elapsed_time_ms(size_t adjustment) { | |
| 1721 guarantee( adjustment == 0 || adjustment == 1, "invariant" ); | |
| 1722 | |
| 1723 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
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1724 size_t young_num = g1h->young_list()->length(); |
| 342 | 1725 if (young_num == 0) |
| 1726 return 0.0; | |
| 1727 | |
| 1728 young_num += adjustment; | |
| 1729 size_t pending_cards = predict_pending_cards(); | |
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1730 size_t rs_lengths = g1h->young_list()->sampled_rs_lengths() + |
| 342 | 1731 predict_rs_length_diff(); |
| 1732 size_t card_num; | |
| 1733 if (full_young_gcs()) | |
| 1734 card_num = predict_young_card_num(rs_lengths); | |
| 1735 else | |
| 1736 card_num = predict_non_young_card_num(rs_lengths); | |
| 1737 size_t young_byte_size = young_num * HeapRegion::GrainBytes; | |
| 1738 double accum_yg_surv_rate = | |
| 1739 _short_lived_surv_rate_group->accum_surv_rate(adjustment); | |
| 1740 | |
| 1741 size_t bytes_to_copy = | |
| 1742 (size_t) (accum_yg_surv_rate * (double) HeapRegion::GrainBytes); | |
| 1743 | |
| 1744 return | |
| 1745 predict_rs_update_time_ms(pending_cards) + | |
| 1746 predict_rs_scan_time_ms(card_num) + | |
| 1747 predict_object_copy_time_ms(bytes_to_copy) + | |
| 1748 predict_young_other_time_ms(young_num) + | |
| 1749 predict_constant_other_time_ms(); | |
| 1750 } | |
| 1751 | |
| 1752 double | |
| 1753 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { | |
| 1754 size_t rs_length = predict_rs_length_diff(); | |
| 1755 size_t card_num; | |
| 1756 if (full_young_gcs()) | |
| 1757 card_num = predict_young_card_num(rs_length); | |
| 1758 else | |
| 1759 card_num = predict_non_young_card_num(rs_length); | |
| 1760 return predict_base_elapsed_time_ms(pending_cards, card_num); | |
| 1761 } | |
| 1762 | |
| 1763 double | |
| 1764 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
| 1765 size_t scanned_cards) { | |
| 1766 return | |
| 1767 predict_rs_update_time_ms(pending_cards) + | |
| 1768 predict_rs_scan_time_ms(scanned_cards) + | |
| 1769 predict_constant_other_time_ms(); | |
| 1770 } | |
| 1771 | |
| 1772 double | |
| 1773 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
| 1774 bool young) { | |
| 1775 size_t rs_length = hr->rem_set()->occupied(); | |
| 1776 size_t card_num; | |
| 1777 if (full_young_gcs()) | |
| 1778 card_num = predict_young_card_num(rs_length); | |
| 1779 else | |
| 1780 card_num = predict_non_young_card_num(rs_length); | |
| 1781 size_t bytes_to_copy = predict_bytes_to_copy(hr); | |
| 1782 | |
| 1783 double region_elapsed_time_ms = | |
| 1784 predict_rs_scan_time_ms(card_num) + | |
| 1785 predict_object_copy_time_ms(bytes_to_copy); | |
| 1786 | |
| 1787 if (young) | |
| 1788 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
| 1789 else | |
| 1790 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
| 1791 | |
| 1792 return region_elapsed_time_ms; | |
| 1793 } | |
| 1794 | |
| 1795 size_t | |
| 1796 G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { | |
| 1797 size_t bytes_to_copy; | |
| 1798 if (hr->is_marked()) | |
| 1799 bytes_to_copy = hr->max_live_bytes(); | |
| 1800 else { | |
| 1801 guarantee( hr->is_young() && hr->age_in_surv_rate_group() != -1, | |
| 1802 "invariant" ); | |
| 1803 int age = hr->age_in_surv_rate_group(); | |
| 545 | 1804 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
| 342 | 1805 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
| 1806 } | |
| 1807 | |
| 1808 return bytes_to_copy; | |
| 1809 } | |
| 1810 | |
| 1811 void | |
| 1812 G1CollectorPolicy::start_recording_regions() { | |
| 1813 _recorded_rs_lengths = 0; | |
| 1814 _recorded_young_regions = 0; | |
| 1815 _recorded_non_young_regions = 0; | |
| 1816 | |
| 1817 #if PREDICTIONS_VERBOSE | |
| 1818 _recorded_marked_bytes = 0; | |
| 1819 _recorded_young_bytes = 0; | |
| 1820 _predicted_bytes_to_copy = 0; | |
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1821 _predicted_rs_lengths = 0; |
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1822 _predicted_cards_scanned = 0; |
| 342 | 1823 #endif // PREDICTIONS_VERBOSE |
| 1824 } | |
| 1825 | |
| 1826 void | |
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1827 G1CollectorPolicy::record_cset_region_info(HeapRegion* hr, bool young) { |
| 342 | 1828 #if PREDICTIONS_VERBOSE |
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1829 if (!young) { |
| 342 | 1830 _recorded_marked_bytes += hr->max_live_bytes(); |
| 1831 } | |
| 1832 _predicted_bytes_to_copy += predict_bytes_to_copy(hr); | |
| 1833 #endif // PREDICTIONS_VERBOSE | |
| 1834 | |
| 1835 size_t rs_length = hr->rem_set()->occupied(); | |
| 1836 _recorded_rs_lengths += rs_length; | |
| 1837 } | |
| 1838 | |
| 1839 void | |
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1840 G1CollectorPolicy::record_non_young_cset_region(HeapRegion* hr) { |
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1841 assert(!hr->is_young(), "should not call this"); |
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1842 ++_recorded_non_young_regions; |
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1843 record_cset_region_info(hr, false); |
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1844 } |
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1845 |
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1846 void |
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1847 G1CollectorPolicy::set_recorded_young_regions(size_t n_regions) { |
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1848 _recorded_young_regions = n_regions; |
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1849 } |
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1850 |
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1851 void G1CollectorPolicy::set_recorded_young_bytes(size_t bytes) { |
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1852 #if PREDICTIONS_VERBOSE |
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1853 _recorded_young_bytes = bytes; |
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1854 #endif // PREDICTIONS_VERBOSE |
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1855 } |
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1856 |
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1857 void G1CollectorPolicy::set_recorded_rs_lengths(size_t rs_lengths) { |
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1858 _recorded_rs_lengths = rs_lengths; |
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1859 } |
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1860 |
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1861 void G1CollectorPolicy::set_predicted_bytes_to_copy(size_t bytes) { |
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1862 _predicted_bytes_to_copy = bytes; |
| 342 | 1863 } |
| 1864 | |
| 1865 void | |
| 1866 G1CollectorPolicy::end_recording_regions() { | |
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1867 // The _predicted_pause_time_ms field is referenced in code |
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1868 // not under PREDICTIONS_VERBOSE. Let's initialize it. |
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1869 _predicted_pause_time_ms = -1.0; |
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1870 |
| 342 | 1871 #if PREDICTIONS_VERBOSE |
| 1872 _predicted_pending_cards = predict_pending_cards(); | |
| 1873 _predicted_rs_lengths = _recorded_rs_lengths + predict_rs_length_diff(); | |
| 1874 if (full_young_gcs()) | |
| 1875 _predicted_cards_scanned += predict_young_card_num(_predicted_rs_lengths); | |
| 1876 else | |
| 1877 _predicted_cards_scanned += | |
| 1878 predict_non_young_card_num(_predicted_rs_lengths); | |
| 1879 _recorded_region_num = _recorded_young_regions + _recorded_non_young_regions; | |
| 1880 | |
| 1881 _predicted_rs_update_time_ms = | |
| 1882 predict_rs_update_time_ms(_g1->pending_card_num()); | |
| 1883 _predicted_rs_scan_time_ms = | |
| 1884 predict_rs_scan_time_ms(_predicted_cards_scanned); | |
| 1885 _predicted_object_copy_time_ms = | |
| 1886 predict_object_copy_time_ms(_predicted_bytes_to_copy); | |
| 1887 _predicted_constant_other_time_ms = | |
| 1888 predict_constant_other_time_ms(); | |
| 1889 _predicted_young_other_time_ms = | |
| 1890 predict_young_other_time_ms(_recorded_young_regions); | |
| 1891 _predicted_non_young_other_time_ms = | |
| 1892 predict_non_young_other_time_ms(_recorded_non_young_regions); | |
| 1893 | |
| 1894 _predicted_pause_time_ms = | |
| 1895 _predicted_rs_update_time_ms + | |
| 1896 _predicted_rs_scan_time_ms + | |
| 1897 _predicted_object_copy_time_ms + | |
| 1898 _predicted_constant_other_time_ms + | |
| 1899 _predicted_young_other_time_ms + | |
| 1900 _predicted_non_young_other_time_ms; | |
| 1901 #endif // PREDICTIONS_VERBOSE | |
| 1902 } | |
| 1903 | |
| 1904 void G1CollectorPolicy::check_if_region_is_too_expensive(double | |
| 1905 predicted_time_ms) { | |
| 1906 // I don't think we need to do this when in young GC mode since | |
| 1907 // marking will be initiated next time we hit the soft limit anyway... | |
| 1908 if (predicted_time_ms > _expensive_region_limit_ms) { | |
| 1909 if (!in_young_gc_mode()) { | |
| 1910 set_full_young_gcs(true); | |
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1911 // We might want to do something different here. However, |
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1912 // right now we don't support the non-generational G1 mode |
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1913 // (and in fact we are planning to remove the associated code, |
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1914 // see CR 6814390). So, let's leave it as is and this will be |
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1915 // removed some time in the future |
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1916 ShouldNotReachHere(); |
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1917 set_during_initial_mark_pause(); |
| 342 | 1918 } else |
| 1919 // no point in doing another partial one | |
| 1920 _should_revert_to_full_young_gcs = true; | |
| 1921 } | |
| 1922 } | |
| 1923 | |
| 1924 // </NEW PREDICTION> | |
| 1925 | |
| 1926 | |
| 1927 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, | |
| 1928 double elapsed_ms) { | |
| 1929 _recent_gc_times_ms->add(elapsed_ms); | |
| 1930 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
| 1931 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
| 1932 } | |
| 1933 | |
| 1934 double G1CollectorPolicy::recent_avg_time_for_pauses_ms() { | |
| 751 | 1935 if (_recent_pause_times_ms->num() == 0) return (double) MaxGCPauseMillis; |
| 342 | 1936 else return _recent_pause_times_ms->avg(); |
| 1937 } | |
| 1938 | |
| 1939 double G1CollectorPolicy::recent_avg_time_for_CH_strong_ms() { | |
| 1940 if (_recent_CH_strong_roots_times_ms->num() == 0) | |
| 751 | 1941 return (double)MaxGCPauseMillis/3.0; |
| 342 | 1942 else return _recent_CH_strong_roots_times_ms->avg(); |
| 1943 } | |
| 1944 | |
| 1945 double G1CollectorPolicy::recent_avg_time_for_G1_strong_ms() { | |
| 1946 if (_recent_G1_strong_roots_times_ms->num() == 0) | |
| 751 | 1947 return (double)MaxGCPauseMillis/3.0; |
| 342 | 1948 else return _recent_G1_strong_roots_times_ms->avg(); |
| 1949 } | |
| 1950 | |
| 1951 double G1CollectorPolicy::recent_avg_time_for_evac_ms() { | |
| 751 | 1952 if (_recent_evac_times_ms->num() == 0) return (double)MaxGCPauseMillis/3.0; |
| 342 | 1953 else return _recent_evac_times_ms->avg(); |
| 1954 } | |
| 1955 | |
| 1956 int G1CollectorPolicy::number_of_recent_gcs() { | |
| 1957 assert(_recent_CH_strong_roots_times_ms->num() == | |
| 1958 _recent_G1_strong_roots_times_ms->num(), "Sequence out of sync"); | |
| 1959 assert(_recent_G1_strong_roots_times_ms->num() == | |
| 1960 _recent_evac_times_ms->num(), "Sequence out of sync"); | |
| 1961 assert(_recent_evac_times_ms->num() == | |
| 1962 _recent_pause_times_ms->num(), "Sequence out of sync"); | |
| 1963 assert(_recent_pause_times_ms->num() == | |
| 1964 _recent_CS_bytes_used_before->num(), "Sequence out of sync"); | |
| 1965 assert(_recent_CS_bytes_used_before->num() == | |
| 1966 _recent_CS_bytes_surviving->num(), "Sequence out of sync"); | |
| 1967 return _recent_pause_times_ms->num(); | |
| 1968 } | |
| 1969 | |
| 1970 double G1CollectorPolicy::recent_avg_survival_fraction() { | |
| 1971 return recent_avg_survival_fraction_work(_recent_CS_bytes_surviving, | |
| 1972 _recent_CS_bytes_used_before); | |
| 1973 } | |
| 1974 | |
| 1975 double G1CollectorPolicy::last_survival_fraction() { | |
| 1976 return last_survival_fraction_work(_recent_CS_bytes_surviving, | |
| 1977 _recent_CS_bytes_used_before); | |
| 1978 } | |
| 1979 | |
| 1980 double | |
| 1981 G1CollectorPolicy::recent_avg_survival_fraction_work(TruncatedSeq* surviving, | |
| 1982 TruncatedSeq* before) { | |
| 1983 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
| 1984 if (before->sum() > 0.0) { | |
| 1985 double recent_survival_rate = surviving->sum() / before->sum(); | |
| 1986 // We exempt parallel collection from this check because Alloc Buffer | |
| 1987 // fragmentation can produce negative collections. | |
| 1988 // Further, we're now always doing parallel collection. But I'm still | |
| 1989 // leaving this here as a placeholder for a more precise assertion later. | |
| 1990 // (DLD, 10/05.) | |
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1991 assert((true || G1CollectedHeap::use_parallel_gc_threads()) || |
| 342 | 1992 _g1->evacuation_failed() || |
| 1993 recent_survival_rate <= 1.0, "Or bad frac"); | |
| 1994 return recent_survival_rate; | |
| 1995 } else { | |
| 1996 return 1.0; // Be conservative. | |
| 1997 } | |
| 1998 } | |
| 1999 | |
| 2000 double | |
| 2001 G1CollectorPolicy::last_survival_fraction_work(TruncatedSeq* surviving, | |
| 2002 TruncatedSeq* before) { | |
| 2003 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
| 2004 if (surviving->num() > 0 && before->last() > 0.0) { | |
| 2005 double last_survival_rate = surviving->last() / before->last(); | |
| 2006 // We exempt parallel collection from this check because Alloc Buffer | |
| 2007 // fragmentation can produce negative collections. | |
| 2008 // Further, we're now always doing parallel collection. But I'm still | |
| 2009 // leaving this here as a placeholder for a more precise assertion later. | |
| 2010 // (DLD, 10/05.) | |
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2011 assert((true || G1CollectedHeap::use_parallel_gc_threads()) || |
| 342 | 2012 last_survival_rate <= 1.0, "Or bad frac"); |
| 2013 return last_survival_rate; | |
| 2014 } else { | |
| 2015 return 1.0; | |
| 2016 } | |
| 2017 } | |
| 2018 | |
| 2019 static const int survival_min_obs = 5; | |
| 2020 static double survival_min_obs_limits[] = { 0.9, 0.7, 0.5, 0.3, 0.1 }; | |
| 2021 static const double min_survival_rate = 0.1; | |
| 2022 | |
| 2023 double | |
| 2024 G1CollectorPolicy::conservative_avg_survival_fraction_work(double avg, | |
| 2025 double latest) { | |
| 2026 double res = avg; | |
| 2027 if (number_of_recent_gcs() < survival_min_obs) { | |
| 2028 res = MAX2(res, survival_min_obs_limits[number_of_recent_gcs()]); | |
| 2029 } | |
| 2030 res = MAX2(res, latest); | |
| 2031 res = MAX2(res, min_survival_rate); | |
| 2032 // In the parallel case, LAB fragmentation can produce "negative | |
| 2033 // collections"; so can evac failure. Cap at 1.0 | |
| 2034 res = MIN2(res, 1.0); | |
| 2035 return res; | |
| 2036 } | |
| 2037 | |
| 2038 size_t G1CollectorPolicy::expansion_amount() { | |
| 1356 | 2039 if ((recent_avg_pause_time_ratio() * 100.0) > _gc_overhead_perc) { |
| 751 | 2040 // We will double the existing space, or take |
| 2041 // G1ExpandByPercentOfAvailable % of the available expansion | |
| 2042 // space, whichever is smaller, bounded below by a minimum | |
| 2043 // expansion (unless that's all that's left.) | |
| 342 | 2044 const size_t min_expand_bytes = 1*M; |
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2045 size_t reserved_bytes = _g1->max_capacity(); |
| 342 | 2046 size_t committed_bytes = _g1->capacity(); |
| 2047 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
| 2048 size_t expand_bytes; | |
| 2049 size_t expand_bytes_via_pct = | |
| 751 | 2050 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
| 342 | 2051 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
| 2052 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
| 2053 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
| 2054 if (G1PolicyVerbose > 1) { | |
| 2055 gclog_or_tty->print("Decided to expand: ratio = %5.2f, " | |
| 2056 "committed = %d%s, uncommited = %d%s, via pct = %d%s.\n" | |
| 2057 " Answer = %d.\n", | |
| 2058 recent_avg_pause_time_ratio(), | |
| 2059 byte_size_in_proper_unit(committed_bytes), | |
| 2060 proper_unit_for_byte_size(committed_bytes), | |
| 2061 byte_size_in_proper_unit(uncommitted_bytes), | |
| 2062 proper_unit_for_byte_size(uncommitted_bytes), | |
| 2063 byte_size_in_proper_unit(expand_bytes_via_pct), | |
| 2064 proper_unit_for_byte_size(expand_bytes_via_pct), | |
| 2065 byte_size_in_proper_unit(expand_bytes), | |
| 2066 proper_unit_for_byte_size(expand_bytes)); | |
| 2067 } | |
| 2068 return expand_bytes; | |
| 2069 } else { | |
| 2070 return 0; | |
| 2071 } | |
| 2072 } | |
| 2073 | |
| 2074 void G1CollectorPolicy::note_start_of_mark_thread() { | |
| 2075 _mark_thread_startup_sec = os::elapsedTime(); | |
| 2076 } | |
| 2077 | |
| 2078 class CountCSClosure: public HeapRegionClosure { | |
| 2079 G1CollectorPolicy* _g1_policy; | |
| 2080 public: | |
| 2081 CountCSClosure(G1CollectorPolicy* g1_policy) : | |
| 2082 _g1_policy(g1_policy) {} | |
| 2083 bool doHeapRegion(HeapRegion* r) { | |
| 2084 _g1_policy->_bytes_in_collection_set_before_gc += r->used(); | |
| 2085 return false; | |
| 2086 } | |
| 2087 }; | |
| 2088 | |
| 2089 void G1CollectorPolicy::count_CS_bytes_used() { | |
| 2090 CountCSClosure cs_closure(this); | |
| 2091 _g1->collection_set_iterate(&cs_closure); | |
| 2092 } | |
| 2093 | |
| 2094 void G1CollectorPolicy::print_summary (int level, | |
| 2095 const char* str, | |
| 2096 NumberSeq* seq) const { | |
| 2097 double sum = seq->sum(); | |
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2098 LineBuffer(level + 1).append_and_print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", |
| 342 | 2099 str, sum / 1000.0, seq->avg()); |
| 2100 } | |
| 2101 | |
| 2102 void G1CollectorPolicy::print_summary_sd (int level, | |
| 2103 const char* str, | |
| 2104 NumberSeq* seq) const { | |
| 2105 print_summary(level, str, seq); | |
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2106 LineBuffer(level + 6).append_and_print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", |
| 342 | 2107 seq->num(), seq->sd(), seq->maximum()); |
| 2108 } | |
| 2109 | |
| 2110 void G1CollectorPolicy::check_other_times(int level, | |
| 2111 NumberSeq* other_times_ms, | |
| 2112 NumberSeq* calc_other_times_ms) const { | |
| 2113 bool should_print = false; | |
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2114 LineBuffer buf(level + 2); |
| 342 | 2115 |
| 2116 double max_sum = MAX2(fabs(other_times_ms->sum()), | |
| 2117 fabs(calc_other_times_ms->sum())); | |
| 2118 double min_sum = MIN2(fabs(other_times_ms->sum()), | |
| 2119 fabs(calc_other_times_ms->sum())); | |
| 2120 double sum_ratio = max_sum / min_sum; | |
| 2121 if (sum_ratio > 1.1) { | |
| 2122 should_print = true; | |
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2123 buf.append_and_print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); |
| 342 | 2124 } |
| 2125 | |
| 2126 double max_avg = MAX2(fabs(other_times_ms->avg()), | |
| 2127 fabs(calc_other_times_ms->avg())); | |
| 2128 double min_avg = MIN2(fabs(other_times_ms->avg()), | |
| 2129 fabs(calc_other_times_ms->avg())); | |
| 2130 double avg_ratio = max_avg / min_avg; | |
| 2131 if (avg_ratio > 1.1) { | |
| 2132 should_print = true; | |
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2133 buf.append_and_print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); |
| 342 | 2134 } |
| 2135 | |
| 2136 if (other_times_ms->sum() < -0.01) { | |
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2137 buf.append_and_print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); |
| 342 | 2138 } |
| 2139 | |
| 2140 if (other_times_ms->avg() < -0.01) { | |
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2141 buf.append_and_print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); |
| 342 | 2142 } |
| 2143 | |
| 2144 if (calc_other_times_ms->sum() < -0.01) { | |
| 2145 should_print = true; | |
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2146 buf.append_and_print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); |
| 342 | 2147 } |
| 2148 | |
| 2149 if (calc_other_times_ms->avg() < -0.01) { | |
| 2150 should_print = true; | |
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2151 buf.append_and_print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); |
| 342 | 2152 } |
| 2153 | |
| 2154 if (should_print) | |
| 2155 print_summary(level, "Other(Calc)", calc_other_times_ms); | |
| 2156 } | |
| 2157 | |
| 2158 void G1CollectorPolicy::print_summary(PauseSummary* summary) const { | |
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2159 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
| 342 | 2160 MainBodySummary* body_summary = summary->main_body_summary(); |
| 2161 if (summary->get_total_seq()->num() > 0) { | |
| 677 | 2162 print_summary_sd(0, "Evacuation Pauses", summary->get_total_seq()); |
| 342 | 2163 if (body_summary != NULL) { |
| 2164 print_summary(1, "SATB Drain", body_summary->get_satb_drain_seq()); | |
| 2165 if (parallel) { | |
| 2166 print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); | |
| 2167 print_summary(2, "Update RS", body_summary->get_update_rs_seq()); | |
| 2168 print_summary(2, "Ext Root Scanning", | |
| 2169 body_summary->get_ext_root_scan_seq()); | |
| 2170 print_summary(2, "Mark Stack Scanning", | |
| 2171 body_summary->get_mark_stack_scan_seq()); | |
| 2172 print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); | |
| 2173 print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); | |
| 2174 print_summary(2, "Termination", body_summary->get_termination_seq()); | |
| 2175 print_summary(2, "Other", body_summary->get_parallel_other_seq()); | |
| 2176 { | |
| 2177 NumberSeq* other_parts[] = { | |
| 2178 body_summary->get_update_rs_seq(), | |
| 2179 body_summary->get_ext_root_scan_seq(), | |
| 2180 body_summary->get_mark_stack_scan_seq(), | |
| 2181 body_summary->get_scan_rs_seq(), | |
| 2182 body_summary->get_obj_copy_seq(), | |
| 2183 body_summary->get_termination_seq() | |
| 2184 }; | |
| 2185 NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), | |
| 1779 | 2186 6, other_parts); |
| 342 | 2187 check_other_times(2, body_summary->get_parallel_other_seq(), |
| 2188 &calc_other_times_ms); | |
| 2189 } | |
| 2190 print_summary(1, "Mark Closure", body_summary->get_mark_closure_seq()); | |
| 2191 print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); | |
| 2192 } else { | |
| 2193 print_summary(1, "Update RS", body_summary->get_update_rs_seq()); | |
| 2194 print_summary(1, "Ext Root Scanning", | |
| 2195 body_summary->get_ext_root_scan_seq()); | |
| 2196 print_summary(1, "Mark Stack Scanning", | |
| 2197 body_summary->get_mark_stack_scan_seq()); | |
| 2198 print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); | |
| 2199 print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); | |
| 2200 } | |
| 2201 } | |
| 2202 print_summary(1, "Other", summary->get_other_seq()); | |
| 2203 { | |
| 1779 | 2204 if (body_summary != NULL) { |
| 2205 NumberSeq calc_other_times_ms; | |
| 2206 if (parallel) { | |
| 2207 // parallel | |
| 2208 NumberSeq* other_parts[] = { | |
| 2209 body_summary->get_satb_drain_seq(), | |
| 2210 body_summary->get_parallel_seq(), | |
| 2211 body_summary->get_clear_ct_seq() | |
| 2212 }; | |
| 2213 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
| 2214 3, other_parts); | |
| 2215 } else { | |
| 2216 // serial | |
| 2217 NumberSeq* other_parts[] = { | |
| 2218 body_summary->get_satb_drain_seq(), | |
| 2219 body_summary->get_update_rs_seq(), | |
| 2220 body_summary->get_ext_root_scan_seq(), | |
| 2221 body_summary->get_mark_stack_scan_seq(), | |
| 2222 body_summary->get_scan_rs_seq(), | |
| 2223 body_summary->get_obj_copy_seq() | |
| 2224 }; | |
| 2225 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
| 2226 6, other_parts); | |
| 2227 } | |
| 2228 check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); | |
| 342 | 2229 } |
| 2230 } | |
| 2231 } else { | |
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2232 LineBuffer(1).append_and_print_cr("none"); |
| 342 | 2233 } |
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2234 LineBuffer(0).append_and_print_cr(""); |
| 342 | 2235 } |
| 2236 | |
| 2237 void G1CollectorPolicy::print_tracing_info() const { | |
| 2238 if (TraceGen0Time) { | |
| 2239 gclog_or_tty->print_cr("ALL PAUSES"); | |
| 2240 print_summary_sd(0, "Total", _all_pause_times_ms); | |
| 2241 gclog_or_tty->print_cr(""); | |
| 2242 gclog_or_tty->print_cr(""); | |
| 2243 gclog_or_tty->print_cr(" Full Young GC Pauses: %8d", _full_young_pause_num); | |
| 2244 gclog_or_tty->print_cr(" Partial Young GC Pauses: %8d", _partial_young_pause_num); | |
| 2245 gclog_or_tty->print_cr(""); | |
| 2246 | |
| 677 | 2247 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
| 2248 print_summary(_summary); | |
| 342 | 2249 |
| 2250 gclog_or_tty->print_cr("MISC"); | |
| 2251 print_summary_sd(0, "Stop World", _all_stop_world_times_ms); | |
| 2252 print_summary_sd(0, "Yields", _all_yield_times_ms); | |
| 2253 for (int i = 0; i < _aux_num; ++i) { | |
| 2254 if (_all_aux_times_ms[i].num() > 0) { | |
| 2255 char buffer[96]; | |
| 2256 sprintf(buffer, "Aux%d", i); | |
| 2257 print_summary_sd(0, buffer, &_all_aux_times_ms[i]); | |
| 2258 } | |
| 2259 } | |
| 2260 | |
| 2261 size_t all_region_num = _region_num_young + _region_num_tenured; | |
| 2262 gclog_or_tty->print_cr(" New Regions %8d, Young %8d (%6.2lf%%), " | |
| 2263 "Tenured %8d (%6.2lf%%)", | |
| 2264 all_region_num, | |
| 2265 _region_num_young, | |
| 2266 (double) _region_num_young / (double) all_region_num * 100.0, | |
| 2267 _region_num_tenured, | |
| 2268 (double) _region_num_tenured / (double) all_region_num * 100.0); | |
| 2269 } | |
| 2270 if (TraceGen1Time) { | |
| 2271 if (_all_full_gc_times_ms->num() > 0) { | |
| 2272 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", | |
| 2273 _all_full_gc_times_ms->num(), | |
| 2274 _all_full_gc_times_ms->sum() / 1000.0); | |
| 2275 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); | |
| 2276 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", | |
| 2277 _all_full_gc_times_ms->sd(), | |
| 2278 _all_full_gc_times_ms->maximum()); | |
| 2279 } | |
| 2280 } | |
| 2281 } | |
| 2282 | |
| 2283 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
| 2284 #ifndef PRODUCT | |
| 2285 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
| 2286 // add this call for any other surv rate groups | |
| 2287 #endif // PRODUCT | |
| 2288 } | |
| 2289 | |
| 1973 | 2290 void |
| 2291 G1CollectorPolicy::update_region_num(bool young) { | |
| 2292 if (young) { | |
| 342 | 2293 ++_region_num_young; |
| 2294 } else { | |
| 2295 ++_region_num_tenured; | |
| 2296 } | |
| 2297 } | |
| 2298 | |
| 2299 #ifndef PRODUCT | |
| 2300 // for debugging, bit of a hack... | |
| 2301 static char* | |
| 2302 region_num_to_mbs(int length) { | |
| 2303 static char buffer[64]; | |
| 2304 double bytes = (double) (length * HeapRegion::GrainBytes); | |
| 2305 double mbs = bytes / (double) (1024 * 1024); | |
| 2306 sprintf(buffer, "%7.2lfMB", mbs); | |
| 2307 return buffer; | |
| 2308 } | |
| 2309 #endif // PRODUCT | |
| 2310 | |
| 545 | 2311 size_t G1CollectorPolicy::max_regions(int purpose) { |
| 342 | 2312 switch (purpose) { |
| 2313 case GCAllocForSurvived: | |
| 545 | 2314 return _max_survivor_regions; |
| 342 | 2315 case GCAllocForTenured: |
| 545 | 2316 return REGIONS_UNLIMITED; |
| 342 | 2317 default: |
| 545 | 2318 ShouldNotReachHere(); |
| 2319 return REGIONS_UNLIMITED; | |
| 342 | 2320 }; |
| 2321 } | |
| 2322 | |
|
1991
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|
2323 void G1CollectorPolicy::calculate_max_gc_locker_expansion() { |
|
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2324 size_t expansion_region_num = 0; |
|
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|
2325 if (GCLockerEdenExpansionPercent > 0) { |
|
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|
2326 double perc = (double) GCLockerEdenExpansionPercent / 100.0; |
|
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|
2327 double expansion_region_num_d = perc * (double) _young_list_target_length; |
|
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|
2328 // We use ceiling so that if expansion_region_num_d is > 0.0 (but |
|
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|
2329 // less than 1.0) we'll get 1. |
|
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|
2330 expansion_region_num = (size_t) ceil(expansion_region_num_d); |
|
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2331 } else { |
|
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|
2332 assert(expansion_region_num == 0, "sanity"); |
|
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|
2333 } |
|
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|
2334 _young_list_max_length = _young_list_target_length + expansion_region_num; |
|
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|
2335 assert(_young_list_target_length <= _young_list_max_length, "post-condition"); |
|
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|
2336 } |
|
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|
2337 |
| 545 | 2338 // Calculates survivor space parameters. |
| 2339 void G1CollectorPolicy::calculate_survivors_policy() | |
| 2340 { | |
| 2341 if (G1FixedSurvivorSpaceSize == 0) { | |
| 2342 _max_survivor_regions = _young_list_target_length / SurvivorRatio; | |
| 2343 } else { | |
|
547
1e458753107d
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apetrusenko
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diff
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|
2344 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
| 545 | 2345 } |
| 2346 | |
| 2347 if (G1FixedTenuringThreshold) { | |
| 2348 _tenuring_threshold = MaxTenuringThreshold; | |
| 2349 } else { | |
| 2350 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( | |
| 2351 HeapRegion::GrainWords * _max_survivor_regions); | |
| 2352 } | |
| 2353 } | |
| 2354 | |
| 342 | 2355 #ifndef PRODUCT |
| 2356 class HRSortIndexIsOKClosure: public HeapRegionClosure { | |
| 2357 CollectionSetChooser* _chooser; | |
| 2358 public: | |
| 2359 HRSortIndexIsOKClosure(CollectionSetChooser* chooser) : | |
| 2360 _chooser(chooser) {} | |
| 2361 | |
| 2362 bool doHeapRegion(HeapRegion* r) { | |
| 2363 if (!r->continuesHumongous()) { | |
| 2364 assert(_chooser->regionProperlyOrdered(r), "Ought to be."); | |
| 2365 } | |
| 2366 return false; | |
| 2367 } | |
| 2368 }; | |
| 2369 | |
| 2370 bool G1CollectorPolicy_BestRegionsFirst::assertMarkedBytesDataOK() { | |
| 2371 HRSortIndexIsOKClosure cl(_collectionSetChooser); | |
| 2372 _g1->heap_region_iterate(&cl); | |
| 2373 return true; | |
| 2374 } | |
| 2375 #endif | |
| 2376 | |
|
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|
2377 bool |
|
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|
2378 G1CollectorPolicy::force_initial_mark_if_outside_cycle() { |
|
4e5661ba9d98
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|
2379 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
|
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|
2380 if (!during_cycle) { |
|
4e5661ba9d98
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|
2381 set_initiate_conc_mark_if_possible(); |
|
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|
2382 return true; |
|
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|
2383 } else { |
|
4e5661ba9d98
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|
2384 return false; |
|
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|
2385 } |
|
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|
2386 } |
|
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|
2387 |
| 342 | 2388 void |
|
1359
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|
2389 G1CollectorPolicy::decide_on_conc_mark_initiation() { |
|
23b1b27ac76c
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|
2390 // We are about to decide on whether this pause will be an |
|
23b1b27ac76c
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|
2391 // initial-mark pause. |
|
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|
2392 |
|
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|
2393 // First, during_initial_mark_pause() should not be already set. We |
|
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|
2394 // will set it here if we have to. However, it should be cleared by |
|
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|
2395 // the end of the pause (it's only set for the duration of an |
|
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|
2396 // initial-mark pause). |
|
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2397 assert(!during_initial_mark_pause(), "pre-condition"); |
|
23b1b27ac76c
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|
2398 |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2399 if (initiate_conc_mark_if_possible()) { |
|
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|
2400 // We had noticed on a previous pause that the heap occupancy has |
|
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|
2401 // gone over the initiating threshold and we should start a |
|
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|
2402 // concurrent marking cycle. So we might initiate one. |
|
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|
2403 |
|
23b1b27ac76c
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|
2404 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
|
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|
2405 if (!during_cycle) { |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2406 // The concurrent marking thread is not "during a cycle", i.e., |
|
23b1b27ac76c
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|
2407 // it has completed the last one. So we can go ahead and |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2408 // initiate a new cycle. |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2409 |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2410 set_during_initial_mark_pause(); |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2411 |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2412 // And we can now clear initiate_conc_mark_if_possible() as |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2413 // we've already acted on it. |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2414 clear_initiate_conc_mark_if_possible(); |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2415 } else { |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2416 // The concurrent marking thread is still finishing up the |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2417 // 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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|
2418 // overlap. In particular, the concurrent marking thread might |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2419 // 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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|
2420 // 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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|
2421 // 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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|
2422 // information might get cleared by the marking thread. And we |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2423 // cannot wait for the marking thread to finish the cycle as it |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2424 // periodically yields while clearing the next marking bitmap |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1356
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|
2425 // and, if it's in a yield point, it's waiting for us to |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2426 // 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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|
2427 // let the concurrent marking thread complete the last one. |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2428 } |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2429 } |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2430 } |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2431 |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2432 void |
| 342 | 2433 G1CollectorPolicy_BestRegionsFirst:: |
| 2434 record_collection_pause_start(double start_time_sec, size_t start_used) { | |
| 2435 G1CollectorPolicy::record_collection_pause_start(start_time_sec, start_used); | |
| 2436 } | |
| 2437 | |
| 2438 class NextNonCSElemFinder: public HeapRegionClosure { | |
| 2439 HeapRegion* _res; | |
| 2440 public: | |
| 2441 NextNonCSElemFinder(): _res(NULL) {} | |
| 2442 bool doHeapRegion(HeapRegion* r) { | |
| 2443 if (!r->in_collection_set()) { | |
| 2444 _res = r; | |
| 2445 return true; | |
| 2446 } else { | |
| 2447 return false; | |
| 2448 } | |
| 2449 } | |
| 2450 HeapRegion* res() { return _res; } | |
| 2451 }; | |
| 2452 | |
| 2453 class KnownGarbageClosure: public HeapRegionClosure { | |
| 2454 CollectionSetChooser* _hrSorted; | |
| 2455 | |
| 2456 public: | |
| 2457 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
| 2458 _hrSorted(hrSorted) | |
| 2459 {} | |
| 2460 | |
| 2461 bool doHeapRegion(HeapRegion* r) { | |
| 2462 // We only include humongous regions in collection | |
| 2463 // sets when concurrent mark shows that their contained object is | |
| 2464 // unreachable. | |
| 2465 | |
| 2466 // Do we have any marking information for this region? | |
| 2467 if (r->is_marked()) { | |
| 2468 // We don't include humongous regions in collection | |
| 2469 // sets because we collect them immediately at the end of a marking | |
| 2470 // cycle. We also don't include young regions because we *must* | |
| 2471 // include them in the next collection pause. | |
| 2472 if (!r->isHumongous() && !r->is_young()) { | |
| 2473 _hrSorted->addMarkedHeapRegion(r); | |
| 2474 } | |
| 2475 } | |
| 2476 return false; | |
| 2477 } | |
| 2478 }; | |
| 2479 | |
| 2480 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
| 2481 CollectionSetChooser* _hrSorted; | |
| 2482 jint _marked_regions_added; | |
| 2483 jint _chunk_size; | |
| 2484 jint _cur_chunk_idx; | |
| 2485 jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) | |
| 2486 int _worker; | |
| 2487 int _invokes; | |
| 2488 | |
| 2489 void get_new_chunk() { | |
| 2490 _cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size); | |
| 2491 _cur_chunk_end = _cur_chunk_idx + _chunk_size; | |
| 2492 } | |
| 2493 void add_region(HeapRegion* r) { | |
| 2494 if (_cur_chunk_idx == _cur_chunk_end) { | |
| 2495 get_new_chunk(); | |
| 2496 } | |
| 2497 assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); | |
| 2498 _hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r); | |
| 2499 _marked_regions_added++; | |
| 2500 _cur_chunk_idx++; | |
| 2501 } | |
| 2502 | |
| 2503 public: | |
| 2504 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
| 2505 jint chunk_size, | |
| 2506 int worker) : | |
| 2507 _hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker), | |
| 2508 _marked_regions_added(0), _cur_chunk_idx(0), _cur_chunk_end(0), | |
| 2509 _invokes(0) | |
| 2510 {} | |
| 2511 | |
| 2512 bool doHeapRegion(HeapRegion* r) { | |
| 2513 // We only include humongous regions in collection | |
| 2514 // sets when concurrent mark shows that their contained object is | |
| 2515 // unreachable. | |
| 2516 _invokes++; | |
| 2517 | |
| 2518 // Do we have any marking information for this region? | |
| 2519 if (r->is_marked()) { | |
| 2520 // We don't include humongous regions in collection | |
| 2521 // sets because we collect them immediately at the end of a marking | |
| 2522 // cycle. | |
| 2523 // We also do not include young regions in collection sets | |
| 2524 if (!r->isHumongous() && !r->is_young()) { | |
| 2525 add_region(r); | |
| 2526 } | |
| 2527 } | |
| 2528 return false; | |
| 2529 } | |
| 2530 jint marked_regions_added() { return _marked_regions_added; } | |
| 2531 int invokes() { return _invokes; } | |
| 2532 }; | |
| 2533 | |
| 2534 class ParKnownGarbageTask: public AbstractGangTask { | |
| 2535 CollectionSetChooser* _hrSorted; | |
| 2536 jint _chunk_size; | |
| 2537 G1CollectedHeap* _g1; | |
| 2538 public: | |
| 2539 ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) : | |
| 2540 AbstractGangTask("ParKnownGarbageTask"), | |
| 2541 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
| 2542 _g1(G1CollectedHeap::heap()) | |
| 2543 {} | |
| 2544 | |
| 2545 void work(int i) { | |
| 2546 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size, i); | |
| 2547 // Back to zero for the claim value. | |
| 355 | 2548 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, i, |
| 2549 HeapRegion::InitialClaimValue); | |
| 342 | 2550 jint regions_added = parKnownGarbageCl.marked_regions_added(); |
| 2551 _hrSorted->incNumMarkedHeapRegions(regions_added); | |
| 2552 if (G1PrintParCleanupStats) { | |
|
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2553 gclog_or_tty->print_cr(" Thread %d called %d times, added %d regions to list.", |
| 342 | 2554 i, parKnownGarbageCl.invokes(), regions_added); |
| 2555 } | |
| 2556 } | |
| 2557 }; | |
| 2558 | |
| 2559 void | |
| 2560 G1CollectorPolicy_BestRegionsFirst:: | |
| 2561 record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
| 2562 size_t max_live_bytes) { | |
| 2563 double start; | |
| 2564 if (G1PrintParCleanupStats) start = os::elapsedTime(); | |
| 2565 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
| 2566 | |
| 2567 _collectionSetChooser->clearMarkedHeapRegions(); | |
| 2568 double clear_marked_end; | |
| 2569 if (G1PrintParCleanupStats) { | |
| 2570 clear_marked_end = os::elapsedTime(); | |
| 2571 gclog_or_tty->print_cr(" clear marked regions + work1: %8.3f ms.", | |
| 2572 (clear_marked_end - start)*1000.0); | |
| 2573 } | |
|
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2574 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 2575 const size_t OverpartitionFactor = 4; |
|
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2576 const size_t MinWorkUnit = 8; |
|
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2577 const size_t WorkUnit = |
| 342 | 2578 MAX2(_g1->n_regions() / (ParallelGCThreads * OverpartitionFactor), |
|
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|
2579 MinWorkUnit); |
| 342 | 2580 _collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(), |
|
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2581 WorkUnit); |
| 342 | 2582 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
|
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2583 (int) WorkUnit); |
| 342 | 2584 _g1->workers()->run_task(&parKnownGarbageTask); |
| 355 | 2585 |
| 2586 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 2587 "sanity check"); | |
| 342 | 2588 } else { |
| 2589 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
| 2590 _g1->heap_region_iterate(&knownGarbagecl); | |
| 2591 } | |
| 2592 double known_garbage_end; | |
| 2593 if (G1PrintParCleanupStats) { | |
| 2594 known_garbage_end = os::elapsedTime(); | |
| 2595 gclog_or_tty->print_cr(" compute known garbage: %8.3f ms.", | |
| 2596 (known_garbage_end - clear_marked_end)*1000.0); | |
| 2597 } | |
| 2598 _collectionSetChooser->sortMarkedHeapRegions(); | |
| 2599 double sort_end; | |
| 2600 if (G1PrintParCleanupStats) { | |
| 2601 sort_end = os::elapsedTime(); | |
| 2602 gclog_or_tty->print_cr(" sorting: %8.3f ms.", | |
| 2603 (sort_end - known_garbage_end)*1000.0); | |
| 2604 } | |
| 2605 | |
| 2606 record_concurrent_mark_cleanup_end_work2(); | |
| 2607 double work2_end; | |
| 2608 if (G1PrintParCleanupStats) { | |
| 2609 work2_end = os::elapsedTime(); | |
| 2610 gclog_or_tty->print_cr(" work2: %8.3f ms.", | |
| 2611 (work2_end - sort_end)*1000.0); | |
| 2612 } | |
| 2613 } | |
| 2614 | |
|
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2615 // Add the heap region at the head of the non-incremental collection set |
| 342 | 2616 void G1CollectorPolicy:: |
| 2617 add_to_collection_set(HeapRegion* hr) { | |
|
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2618 assert(_inc_cset_build_state == Active, "Precondition"); |
|
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2619 assert(!hr->is_young(), "non-incremental add of young region"); |
|
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2620 |
| 1282 | 2621 if (G1PrintHeapRegions) { |
| 1388 | 2622 gclog_or_tty->print_cr("added region to cset " |
| 2623 "%d:["PTR_FORMAT", "PTR_FORMAT"], " | |
| 2624 "top "PTR_FORMAT", %s", | |
| 2625 hr->hrs_index(), hr->bottom(), hr->end(), | |
| 2626 hr->top(), hr->is_young() ? "YOUNG" : "NOT_YOUNG"); | |
| 342 | 2627 } |
| 2628 | |
| 2629 if (_g1->mark_in_progress()) | |
| 2630 _g1->concurrent_mark()->registerCSetRegion(hr); | |
| 2631 | |
|
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|
2632 assert(!hr->in_collection_set(), "should not already be in the CSet"); |
| 342 | 2633 hr->set_in_collection_set(true); |
| 2634 hr->set_next_in_collection_set(_collection_set); | |
| 2635 _collection_set = hr; | |
| 2636 _collection_set_size++; | |
| 2637 _collection_set_bytes_used_before += hr->used(); | |
| 526 | 2638 _g1->register_region_with_in_cset_fast_test(hr); |
| 342 | 2639 } |
| 2640 | |
|
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2641 // Initialize the per-collection-set information |
|
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|
2642 void G1CollectorPolicy::start_incremental_cset_building() { |
|
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|
2643 assert(_inc_cset_build_state == Inactive, "Precondition"); |
|
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2644 |
|
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|
2645 _inc_cset_head = NULL; |
|
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|
2646 _inc_cset_tail = NULL; |
|
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|
2647 _inc_cset_size = 0; |
|
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2648 _inc_cset_bytes_used_before = 0; |
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|
2649 |
|
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|
2650 if (in_young_gc_mode()) { |
|
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2651 _inc_cset_young_index = 0; |
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|
2652 } |
|
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|
2653 |
|
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|
2654 _inc_cset_max_finger = 0; |
|
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|
2655 _inc_cset_recorded_young_bytes = 0; |
|
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|
2656 _inc_cset_recorded_rs_lengths = 0; |
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|
2657 _inc_cset_predicted_elapsed_time_ms = 0; |
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|
2658 _inc_cset_predicted_bytes_to_copy = 0; |
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2659 _inc_cset_build_state = Active; |
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|
2660 } |
|
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|
2661 |
|
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|
2662 void G1CollectorPolicy::add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length) { |
|
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2663 // This routine is used when: |
|
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|
2664 // * adding survivor regions to the incremental cset at the end of an |
|
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|
2665 // evacuation pause, |
|
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|
2666 // * adding the current allocation region to the incremental cset |
|
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|
2667 // when it is retired, and |
|
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|
2668 // * updating existing policy information for a region in the |
|
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|
2669 // incremental cset via young list RSet sampling. |
|
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|
2670 // Therefore this routine may be called at a safepoint by the |
|
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|
2671 // VM thread, or in-between safepoints by mutator threads (when |
|
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|
2672 // retiring the current allocation region) or a concurrent |
|
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|
2673 // refine thread (RSet sampling). |
|
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|
2674 |
|
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|
2675 double region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, true); |
|
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|
2676 size_t used_bytes = hr->used(); |
|
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2677 |
|
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|
2678 _inc_cset_recorded_rs_lengths += rs_length; |
|
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|
2679 _inc_cset_predicted_elapsed_time_ms += region_elapsed_time_ms; |
|
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|
2680 |
|
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|
2681 _inc_cset_bytes_used_before += used_bytes; |
|
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|
2682 |
|
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|
2683 // Cache the values we have added to the aggregated informtion |
|
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|
2684 // in the heap region in case we have to remove this region from |
|
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|
2685 // the incremental collection set, or it is updated by the |
|
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|
2686 // rset sampling code |
|
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|
2687 hr->set_recorded_rs_length(rs_length); |
|
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|
2688 hr->set_predicted_elapsed_time_ms(region_elapsed_time_ms); |
|
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2689 |
|
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|
2690 #if PREDICTIONS_VERBOSE |
|
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|
2691 size_t bytes_to_copy = predict_bytes_to_copy(hr); |
|
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|
2692 _inc_cset_predicted_bytes_to_copy += bytes_to_copy; |
|
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|
2693 |
|
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|
2694 // Record the number of bytes used in this region |
|
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|
2695 _inc_cset_recorded_young_bytes += used_bytes; |
|
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|
2696 |
|
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|
2697 // Cache the values we have added to the aggregated informtion |
|
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|
2698 // in the heap region in case we have to remove this region from |
|
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|
2699 // the incremental collection set, or it is updated by the |
|
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|
2700 // rset sampling code |
|
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|
2701 hr->set_predicted_bytes_to_copy(bytes_to_copy); |
|
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|
2702 #endif // PREDICTIONS_VERBOSE |
|
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|
2703 } |
|
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|
2704 |
|
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|
2705 void G1CollectorPolicy::remove_from_incremental_cset_info(HeapRegion* hr) { |
|
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|
2706 // This routine is currently only called as part of the updating of |
|
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|
2707 // existing policy information for regions in the incremental cset that |
|
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|
2708 // is performed by the concurrent refine thread(s) as part of young list |
|
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|
2709 // RSet sampling. Therefore we should not be at a safepoint. |
|
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|
2710 |
|
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|
2711 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2712 assert(hr->is_young(), "it should be"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2713 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2714 size_t used_bytes = hr->used(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2715 size_t old_rs_length = hr->recorded_rs_length(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2716 double old_elapsed_time_ms = hr->predicted_elapsed_time_ms(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2717 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2718 // Subtract the old recorded/predicted policy information for |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2719 // the given heap region from the collection set info. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2720 _inc_cset_recorded_rs_lengths -= old_rs_length; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2721 _inc_cset_predicted_elapsed_time_ms -= old_elapsed_time_ms; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2722 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2723 _inc_cset_bytes_used_before -= used_bytes; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2724 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2725 // Clear the values cached in the heap region |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2726 hr->set_recorded_rs_length(0); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2727 hr->set_predicted_elapsed_time_ms(0); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2728 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2729 #if PREDICTIONS_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2730 size_t old_predicted_bytes_to_copy = hr->predicted_bytes_to_copy(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2731 _inc_cset_predicted_bytes_to_copy -= old_predicted_bytes_to_copy; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2732 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2733 // Subtract the number of bytes used in this region |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2734 _inc_cset_recorded_young_bytes -= used_bytes; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2735 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2736 // Clear the values cached in the heap region |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2737 hr->set_predicted_bytes_to_copy(0); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2738 #endif // PREDICTIONS_VERBOSE |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2739 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2740 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2741 void G1CollectorPolicy::update_incremental_cset_info(HeapRegion* hr, size_t new_rs_length) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2742 // Update the collection set information that is dependent on the new RS length |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2743 assert(hr->is_young(), "Precondition"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2744 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2745 remove_from_incremental_cset_info(hr); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2746 add_to_incremental_cset_info(hr, new_rs_length); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2747 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2748 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2749 void G1CollectorPolicy::add_region_to_incremental_cset_common(HeapRegion* hr) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2750 assert( hr->is_young(), "invariant"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2751 assert( hr->young_index_in_cset() == -1, "invariant" ); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2752 assert(_inc_cset_build_state == Active, "Precondition"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2753 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2754 // We need to clear and set the cached recorded/cached collection set |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2755 // information in the heap region here (before the region gets added |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2756 // to the collection set). An individual heap region's cached values |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2757 // are calculated, aggregated with the policy collection set info, |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2758 // and cached in the heap region here (initially) and (subsequently) |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2759 // by the Young List sampling code. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2760 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2761 size_t rs_length = hr->rem_set()->occupied(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2762 add_to_incremental_cset_info(hr, rs_length); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2763 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2764 HeapWord* hr_end = hr->end(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2765 _inc_cset_max_finger = MAX2(_inc_cset_max_finger, hr_end); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2766 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2767 assert(!hr->in_collection_set(), "invariant"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2768 hr->set_in_collection_set(true); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2769 assert( hr->next_in_collection_set() == NULL, "invariant"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2770 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2771 _inc_cset_size++; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2772 _g1->register_region_with_in_cset_fast_test(hr); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2773 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2774 hr->set_young_index_in_cset((int) _inc_cset_young_index); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2775 ++_inc_cset_young_index; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2776 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2777 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2778 // Add the region at the RHS of the incremental cset |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2779 void G1CollectorPolicy::add_region_to_incremental_cset_rhs(HeapRegion* hr) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2780 // We should only ever be appending survivors at the end of a pause |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2781 assert( hr->is_survivor(), "Logic"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2782 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2783 // Do the 'common' stuff |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2784 add_region_to_incremental_cset_common(hr); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2785 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2786 // Now add the region at the right hand side |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2787 if (_inc_cset_tail == NULL) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2788 assert(_inc_cset_head == NULL, "invariant"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2789 _inc_cset_head = hr; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2790 } else { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2791 _inc_cset_tail->set_next_in_collection_set(hr); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2792 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2793 _inc_cset_tail = hr; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2794 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2795 if (G1PrintHeapRegions) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2796 gclog_or_tty->print_cr(" added region to incremental cset (RHS) " |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2797 "%d:["PTR_FORMAT", "PTR_FORMAT"], " |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2798 "top "PTR_FORMAT", young %s", |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2799 hr->hrs_index(), hr->bottom(), hr->end(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2800 hr->top(), (hr->is_young()) ? "YES" : "NO"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2801 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2802 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2803 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2804 // Add the region to the LHS of the incremental cset |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2805 void G1CollectorPolicy::add_region_to_incremental_cset_lhs(HeapRegion* hr) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2806 // Survivors should be added to the RHS at the end of a pause |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2807 assert(!hr->is_survivor(), "Logic"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2808 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2809 // Do the 'common' stuff |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2810 add_region_to_incremental_cset_common(hr); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2811 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2812 // Add the region at the left hand side |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2813 hr->set_next_in_collection_set(_inc_cset_head); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2814 if (_inc_cset_head == NULL) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2815 assert(_inc_cset_tail == NULL, "Invariant"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2816 _inc_cset_tail = hr; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2817 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2818 _inc_cset_head = hr; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2819 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2820 if (G1PrintHeapRegions) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2821 gclog_or_tty->print_cr(" added region to incremental cset (LHS) " |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2822 "%d:["PTR_FORMAT", "PTR_FORMAT"], " |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2823 "top "PTR_FORMAT", young %s", |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2824 hr->hrs_index(), hr->bottom(), hr->end(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
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changeset
|
2825 hr->top(), (hr->is_young()) ? "YES" : "NO"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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changeset
|
2826 } |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2827 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2828 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2829 #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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|
2830 void G1CollectorPolicy::print_collection_set(HeapRegion* list_head, outputStream* st) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2831 assert(list_head == inc_cset_head() || list_head == collection_set(), "must be"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2832 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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changeset
|
2833 st->print_cr("\nCollection_set:"); |
|
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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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|
2834 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
|
2835 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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changeset
|
2836 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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changeset
|
2837 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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|
2838 st->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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changeset
|
2839 "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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|
2840 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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|
2841 csr->top(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2842 csr->prev_top_at_mark_start(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2843 csr->next_top_at_mark_start(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2844 csr->top_at_conc_mark_count(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2845 csr->age_in_surv_rate_group_cond(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2846 csr->is_young(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2847 csr->is_survivor()); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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changeset
|
2848 csr = next; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2849 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2850 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2851 #endif // !PRODUCT |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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changeset
|
2852 |
| 1707 | 2853 void |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2854 G1CollectorPolicy_BestRegionsFirst::choose_collection_set( |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2855 double target_pause_time_ms) { |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2856 // Set this here - in case we're not doing young collections. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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changeset
|
2857 double non_young_start_time_sec = os::elapsedTime(); |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2858 |
| 342 | 2859 start_recording_regions(); |
| 2860 | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2861 guarantee(target_pause_time_ms > 0.0, |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2862 err_msg("target_pause_time_ms = %1.6lf should be positive", |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2863 target_pause_time_ms)); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2864 guarantee(_collection_set == NULL, "Precondition"); |
| 342 | 2865 |
| 2866 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
| 2867 double predicted_pause_time_ms = base_time_ms; | |
| 2868 | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2869 double time_remaining_ms = target_pause_time_ms - base_time_ms; |
| 342 | 2870 |
| 2871 // the 10% and 50% values are arbitrary... | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2872 if (time_remaining_ms < 0.10 * target_pause_time_ms) { |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2873 time_remaining_ms = 0.50 * target_pause_time_ms; |
| 342 | 2874 _within_target = false; |
| 2875 } else { | |
| 2876 _within_target = true; | |
| 2877 } | |
| 2878 | |
| 2879 // We figure out the number of bytes available for future to-space. | |
| 2880 // For new regions without marking information, we must assume the | |
| 2881 // worst-case of complete survival. If we have marking information for a | |
| 2882 // region, we can bound the amount of live data. We can add a number of | |
| 2883 // such regions, as long as the sum of the live data bounds does not | |
| 2884 // exceed the available evacuation space. | |
| 2885 size_t max_live_bytes = _g1->free_regions() * HeapRegion::GrainBytes; | |
| 2886 | |
| 2887 size_t expansion_bytes = | |
| 2888 _g1->expansion_regions() * HeapRegion::GrainBytes; | |
| 2889 | |
| 677 | 2890 _collection_set_bytes_used_before = 0; |
| 2891 _collection_set_size = 0; | |
| 342 | 2892 |
| 2893 // Adjust for expansion and slop. | |
| 2894 max_live_bytes = max_live_bytes + expansion_bytes; | |
| 2895 | |
| 2896 HeapRegion* hr; | |
| 2897 if (in_young_gc_mode()) { | |
| 2898 double young_start_time_sec = os::elapsedTime(); | |
| 2899 | |
| 2900 if (G1PolicyVerbose > 0) { | |
| 2901 gclog_or_tty->print_cr("Adding %d young regions to the CSet", | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2902 _g1->young_list()->length()); |
| 342 | 2903 } |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2904 |
| 342 | 2905 _young_cset_length = 0; |
| 2906 _last_young_gc_full = full_young_gcs() ? true : false; | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2907 |
| 342 | 2908 if (_last_young_gc_full) |
| 2909 ++_full_young_pause_num; | |
| 2910 else | |
| 2911 ++_partial_young_pause_num; | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2912 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2913 // The young list is laid with the survivor regions from the previous |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2914 // pause are appended to the RHS of the young list, i.e. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2915 // [Newly Young Regions ++ Survivors from last pause]. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2916 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2917 hr = _g1->young_list()->first_survivor_region(); |
| 342 | 2918 while (hr != NULL) { |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2919 assert(hr->is_survivor(), "badly formed young list"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2920 hr->set_young(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2921 hr = hr->get_next_young_region(); |
| 342 | 2922 } |
| 2923 | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2924 // Clear the fields that point to the survivor list - they are |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2925 // all young now. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2926 _g1->young_list()->clear_survivors(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2927 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2928 if (_g1->mark_in_progress()) |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2929 _g1->concurrent_mark()->register_collection_set_finger(_inc_cset_max_finger); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2930 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2931 _young_cset_length = _inc_cset_young_index; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2932 _collection_set = _inc_cset_head; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2933 _collection_set_size = _inc_cset_size; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2934 _collection_set_bytes_used_before = _inc_cset_bytes_used_before; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2935 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2936 // For young regions in the collection set, we assume the worst |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2937 // case of complete survival |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2938 max_live_bytes -= _inc_cset_size * HeapRegion::GrainBytes; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2939 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2940 time_remaining_ms -= _inc_cset_predicted_elapsed_time_ms; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2941 predicted_pause_time_ms += _inc_cset_predicted_elapsed_time_ms; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2942 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2943 // The number of recorded young regions is the incremental |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2944 // collection set's current size |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2945 set_recorded_young_regions(_inc_cset_size); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2946 set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2947 set_recorded_young_bytes(_inc_cset_recorded_young_bytes); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2948 #if PREDICTIONS_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2949 set_predicted_bytes_to_copy(_inc_cset_predicted_bytes_to_copy); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2950 #endif // PREDICTIONS_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2951 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2952 if (G1PolicyVerbose > 0) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2953 gclog_or_tty->print_cr(" Added " PTR_FORMAT " Young Regions to CS.", |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2954 _inc_cset_size); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2955 gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2956 max_live_bytes/K); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2957 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2958 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2959 assert(_inc_cset_size == _g1->young_list()->length(), "Invariant"); |
| 342 | 2960 |
| 2961 double young_end_time_sec = os::elapsedTime(); | |
| 2962 _recorded_young_cset_choice_time_ms = | |
| 2963 (young_end_time_sec - young_start_time_sec) * 1000.0; | |
| 2964 | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2965 // We are doing young collections so reset this. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2966 non_young_start_time_sec = young_end_time_sec; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2967 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2968 // Note we can use either _collection_set_size or |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2969 // _young_cset_length here |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2970 if (_collection_set_size > 0 && _last_young_gc_full) { |
| 342 | 2971 // don't bother adding more regions... |
| 2972 goto choose_collection_set_end; | |
| 2973 } | |
| 2974 } | |
| 2975 | |
| 2976 if (!in_young_gc_mode() || !full_young_gcs()) { | |
| 2977 bool should_continue = true; | |
| 2978 NumberSeq seq; | |
| 2979 double avg_prediction = 100000000000000000.0; // something very large | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2980 |
| 342 | 2981 do { |
| 2982 hr = _collectionSetChooser->getNextMarkedRegion(time_remaining_ms, | |
| 2983 avg_prediction); | |
| 677 | 2984 if (hr != NULL) { |
| 342 | 2985 double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
| 2986 time_remaining_ms -= predicted_time_ms; | |
| 2987 predicted_pause_time_ms += predicted_time_ms; | |
| 2988 add_to_collection_set(hr); | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2989 record_non_young_cset_region(hr); |
| 342 | 2990 max_live_bytes -= MIN2(hr->max_live_bytes(), max_live_bytes); |
| 2991 if (G1PolicyVerbose > 0) { | |
| 2992 gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", | |
| 2993 max_live_bytes/K); | |
| 2994 } | |
| 2995 seq.add(predicted_time_ms); | |
| 2996 avg_prediction = seq.avg() + seq.sd(); | |
| 2997 } | |
| 2998 should_continue = | |
| 2999 ( hr != NULL) && | |
| 3000 ( (adaptive_young_list_length()) ? time_remaining_ms > 0.0 | |
| 3001 : _collection_set_size < _young_list_fixed_length ); | |
| 3002 } while (should_continue); | |
| 3003 | |
| 3004 if (!adaptive_young_list_length() && | |
| 3005 _collection_set_size < _young_list_fixed_length) | |
| 3006 _should_revert_to_full_young_gcs = true; | |
| 3007 } | |
| 3008 | |
| 3009 choose_collection_set_end: | |
|
1394
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3010 stop_incremental_cset_building(); |
|
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3011 |
| 342 | 3012 count_CS_bytes_used(); |
| 3013 | |
| 3014 end_recording_regions(); | |
| 3015 | |
| 3016 double non_young_end_time_sec = os::elapsedTime(); | |
| 3017 _recorded_non_young_cset_choice_time_ms = | |
| 3018 (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; | |
| 3019 } | |
| 3020 | |
| 3021 void G1CollectorPolicy_BestRegionsFirst::record_full_collection_end() { | |
| 3022 G1CollectorPolicy::record_full_collection_end(); | |
| 3023 _collectionSetChooser->updateAfterFullCollection(); | |
| 3024 } | |
| 3025 | |
| 3026 void G1CollectorPolicy_BestRegionsFirst:: | |
| 3027 expand_if_possible(size_t numRegions) { | |
| 3028 size_t expansion_bytes = numRegions * HeapRegion::GrainBytes; | |
| 3029 _g1->expand(expansion_bytes); | |
| 3030 } | |
| 3031 | |
| 3032 void G1CollectorPolicy_BestRegionsFirst:: | |
| 1707 | 3033 record_collection_pause_end() { |
| 3034 G1CollectorPolicy::record_collection_pause_end(); | |
| 342 | 3035 assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end."); |
| 3036 } |