Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 3914:20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
Summary: It introduces ergonomic decision logging in G1 for the following heuristics: heap sizing, collection set construction, concurrent cycle initiation, and partially-young GC start/end. The code has a bit of refactoring in a few places to make the decision logging possible. It also replaces alternative ad-hoc logging that we have under different parameters and switches (G1_DEBUG, G1PolicyVerbose).
Reviewed-by: johnc, ysr
| author | tonyp |
|---|---|
| date | Wed, 07 Sep 2011 12:21:23 -0400 |
| parents | ae73da50be4b |
| children | 4f41766176cf |
| 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" | |
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31 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
| 1972 | 32 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
| 33 #include "gc_implementation/shared/gcPolicyCounters.hpp" | |
| 34 #include "runtime/arguments.hpp" | |
| 35 #include "runtime/java.hpp" | |
| 36 #include "runtime/mutexLocker.hpp" | |
| 37 #include "utilities/debug.hpp" | |
| 342 | 38 |
| 39 #define PREDICTIONS_VERBOSE 0 | |
| 40 | |
| 41 // <NEW PREDICTION> | |
| 42 | |
| 43 // Different defaults for different number of GC threads | |
| 44 // They were chosen by running GCOld and SPECjbb on debris with different | |
| 45 // numbers of GC threads and choosing them based on the results | |
| 46 | |
| 47 // all the same | |
| 48 static double rs_length_diff_defaults[] = { | |
| 49 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 | |
| 50 }; | |
| 51 | |
| 52 static double cost_per_card_ms_defaults[] = { | |
| 53 0.01, 0.005, 0.005, 0.003, 0.003, 0.002, 0.002, 0.0015 | |
| 54 }; | |
| 55 | |
| 56 // all the same | |
| 57 static double fully_young_cards_per_entry_ratio_defaults[] = { | |
| 58 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 | |
| 59 }; | |
| 60 | |
| 61 static double cost_per_entry_ms_defaults[] = { | |
| 62 0.015, 0.01, 0.01, 0.008, 0.008, 0.0055, 0.0055, 0.005 | |
| 63 }; | |
| 64 | |
| 65 static double cost_per_byte_ms_defaults[] = { | |
| 66 0.00006, 0.00003, 0.00003, 0.000015, 0.000015, 0.00001, 0.00001, 0.000009 | |
| 67 }; | |
| 68 | |
| 69 // these should be pretty consistent | |
| 70 static double constant_other_time_ms_defaults[] = { | |
| 71 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0 | |
| 72 }; | |
| 73 | |
| 74 | |
| 75 static double young_other_cost_per_region_ms_defaults[] = { | |
| 76 0.3, 0.2, 0.2, 0.15, 0.15, 0.12, 0.12, 0.1 | |
| 77 }; | |
| 78 | |
| 79 static double non_young_other_cost_per_region_ms_defaults[] = { | |
| 80 1.0, 0.7, 0.7, 0.5, 0.5, 0.42, 0.42, 0.30 | |
| 81 }; | |
| 82 | |
| 83 // </NEW PREDICTION> | |
| 84 | |
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85 // Help class for avoiding interleaved logging |
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86 class LineBuffer: public StackObj { |
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87 |
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88 private: |
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89 static const int BUFFER_LEN = 1024; |
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90 static const int INDENT_CHARS = 3; |
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91 char _buffer[BUFFER_LEN]; |
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92 int _indent_level; |
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93 int _cur; |
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94 |
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95 void vappend(const char* format, va_list ap) { |
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96 int res = vsnprintf(&_buffer[_cur], BUFFER_LEN - _cur, format, ap); |
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97 if (res != -1) { |
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98 _cur += res; |
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99 } else { |
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100 DEBUG_ONLY(warning("buffer too small in LineBuffer");) |
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101 _buffer[BUFFER_LEN -1] = 0; |
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102 _cur = BUFFER_LEN; // vsnprintf above should not add to _buffer if we are called again |
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103 } |
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104 } |
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105 |
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106 public: |
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107 explicit LineBuffer(int indent_level): _indent_level(indent_level), _cur(0) { |
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108 for (; (_cur < BUFFER_LEN && _cur < (_indent_level * INDENT_CHARS)); _cur++) { |
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109 _buffer[_cur] = ' '; |
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110 } |
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111 } |
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112 |
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113 #ifndef PRODUCT |
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114 ~LineBuffer() { |
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115 assert(_cur == _indent_level * INDENT_CHARS, "pending data in buffer - append_and_print_cr() not called?"); |
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116 } |
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117 #endif |
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118 |
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119 void append(const char* format, ...) { |
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120 va_list ap; |
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121 va_start(ap, format); |
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122 vappend(format, ap); |
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123 va_end(ap); |
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124 } |
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125 |
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126 void append_and_print_cr(const char* format, ...) { |
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127 va_list ap; |
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128 va_start(ap, format); |
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129 vappend(format, ap); |
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130 va_end(ap); |
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131 gclog_or_tty->print_cr("%s", _buffer); |
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132 _cur = _indent_level * INDENT_CHARS; |
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133 } |
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134 }; |
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135 |
| 342 | 136 G1CollectorPolicy::G1CollectorPolicy() : |
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137 _parallel_gc_threads(G1CollectedHeap::use_parallel_gc_threads() |
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138 ? ParallelGCThreads : 1), |
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139 |
| 342 | 140 _n_pauses(0), |
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141 _recent_rs_scan_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
| 342 | 142 _recent_pause_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
| 143 _recent_rs_sizes(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 144 _recent_gc_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 145 _all_pause_times_ms(new NumberSeq()), | |
| 146 _stop_world_start(0.0), | |
| 147 _all_stop_world_times_ms(new NumberSeq()), | |
| 148 _all_yield_times_ms(new NumberSeq()), | |
| 149 | |
| 150 _all_mod_union_times_ms(new NumberSeq()), | |
| 151 | |
| 677 | 152 _summary(new Summary()), |
| 342 | 153 |
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154 #ifndef PRODUCT |
| 342 | 155 _cur_clear_ct_time_ms(0.0), |
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156 _min_clear_cc_time_ms(-1.0), |
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157 _max_clear_cc_time_ms(-1.0), |
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158 _cur_clear_cc_time_ms(0.0), |
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159 _cum_clear_cc_time_ms(0.0), |
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160 _num_cc_clears(0L), |
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161 #endif |
| 342 | 162 |
| 163 _region_num_young(0), | |
| 164 _region_num_tenured(0), | |
| 165 _prev_region_num_young(0), | |
| 166 _prev_region_num_tenured(0), | |
| 167 | |
| 168 _aux_num(10), | |
| 169 _all_aux_times_ms(new NumberSeq[_aux_num]), | |
| 170 _cur_aux_start_times_ms(new double[_aux_num]), | |
| 171 _cur_aux_times_ms(new double[_aux_num]), | |
| 172 _cur_aux_times_set(new bool[_aux_num]), | |
| 173 | |
| 174 _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 175 _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 176 | |
| 177 // <NEW PREDICTION> | |
| 178 | |
| 179 _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 180 _prev_collection_pause_end_ms(0.0), | |
| 181 _pending_card_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 182 _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 183 _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 184 _fully_young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 185 _partially_young_cards_per_entry_ratio_seq( | |
| 186 new TruncatedSeq(TruncatedSeqLength)), | |
| 187 _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 188 _partially_young_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 189 _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 190 _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 191 _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 192 _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 193 _non_young_other_cost_per_region_ms_seq( | |
| 194 new TruncatedSeq(TruncatedSeqLength)), | |
| 195 | |
| 196 _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 197 _scanned_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 198 _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 199 | |
| 751 | 200 _pause_time_target_ms((double) MaxGCPauseMillis), |
| 342 | 201 |
| 202 // </NEW PREDICTION> | |
| 203 | |
| 204 _full_young_gcs(true), | |
| 205 _full_young_pause_num(0), | |
| 206 _partial_young_pause_num(0), | |
| 207 | |
| 208 _during_marking(false), | |
| 209 _in_marking_window(false), | |
| 210 _in_marking_window_im(false), | |
| 211 | |
| 212 _known_garbage_ratio(0.0), | |
| 213 _known_garbage_bytes(0), | |
| 214 | |
| 215 _young_gc_eff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 216 | |
| 217 _recent_prev_end_times_for_all_gcs_sec(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 218 | |
| 219 _recent_CS_bytes_used_before(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 220 _recent_CS_bytes_surviving(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 221 | |
| 222 _recent_avg_pause_time_ratio(0.0), | |
| 223 _num_markings(0), | |
| 224 _n_marks(0), | |
| 225 _n_pauses_at_mark_end(0), | |
| 226 | |
| 227 _all_full_gc_times_ms(new NumberSeq()), | |
| 228 | |
| 229 // G1PausesBtwnConcMark defaults to -1 | |
| 230 // so the hack is to do the cast QQQ FIXME | |
| 231 _pauses_btwn_concurrent_mark((size_t)G1PausesBtwnConcMark), | |
| 232 _n_marks_since_last_pause(0), | |
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233 _initiate_conc_mark_if_possible(false), |
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234 _during_initial_mark_pause(false), |
| 342 | 235 _should_revert_to_full_young_gcs(false), |
| 236 _last_full_young_gc(false), | |
| 237 | |
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238 _eden_bytes_before_gc(0), |
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239 _survivor_bytes_before_gc(0), |
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240 _capacity_before_gc(0), |
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241 |
| 342 | 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 | |
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275 _gc_overhead_perc(0.0) { |
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276 |
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277 // Set up the region size and associated fields. Given that the |
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278 // policy is created before the heap, we have to set this up here, |
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279 // so it's done as soon as possible. |
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280 HeapRegion::setup_heap_region_size(Arguments::min_heap_size()); |
|
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281 HeapRegionRemSet::setup_remset_size(); |
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282 |
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283 G1ErgoVerbose::initialize(); |
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284 if (PrintAdaptiveSizePolicy) { |
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285 // Currently, we only use a single switch for all the heuristics. |
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286 G1ErgoVerbose::set_enabled(true); |
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287 // Given that we don't currently have a verboseness level |
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288 // parameter, we'll hardcode this to high. This can be easily |
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289 // changed in the future. |
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290 G1ErgoVerbose::set_level(ErgoHigh); |
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291 } else { |
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292 G1ErgoVerbose::set_enabled(false); |
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293 } |
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294 |
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295 // Verify PLAB sizes |
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296 const uint region_size = HeapRegion::GrainWords; |
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297 if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
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298 char buffer[128]; |
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299 jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most %u", |
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300 OldPLABSize > region_size ? "Old" : "Young", region_size); |
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301 vm_exit_during_initialization(buffer); |
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302 } |
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303 |
| 342 | 304 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
| 305 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
| 306 | |
| 1611 | 307 _par_last_gc_worker_start_times_ms = new double[_parallel_gc_threads]; |
| 342 | 308 _par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads]; |
| 309 _par_last_mark_stack_scan_times_ms = new double[_parallel_gc_threads]; | |
| 310 | |
| 311 _par_last_update_rs_times_ms = new double[_parallel_gc_threads]; | |
| 312 _par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; | |
| 313 | |
| 314 _par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; | |
| 315 | |
| 316 _par_last_obj_copy_times_ms = new double[_parallel_gc_threads]; | |
| 317 | |
| 318 _par_last_termination_times_ms = new double[_parallel_gc_threads]; | |
| 1611 | 319 _par_last_termination_attempts = new double[_parallel_gc_threads]; |
| 320 _par_last_gc_worker_end_times_ms = new double[_parallel_gc_threads]; | |
| 2430 | 321 _par_last_gc_worker_times_ms = new double[_parallel_gc_threads]; |
| 342 | 322 |
| 323 // start conservatively | |
| 751 | 324 _expensive_region_limit_ms = 0.5 * (double) MaxGCPauseMillis; |
| 342 | 325 |
| 326 // <NEW PREDICTION> | |
| 327 | |
| 328 int index; | |
| 329 if (ParallelGCThreads == 0) | |
| 330 index = 0; | |
| 331 else if (ParallelGCThreads > 8) | |
| 332 index = 7; | |
| 333 else | |
| 334 index = ParallelGCThreads - 1; | |
| 335 | |
| 336 _pending_card_diff_seq->add(0.0); | |
| 337 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
| 338 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
| 339 _fully_young_cards_per_entry_ratio_seq->add( | |
| 340 fully_young_cards_per_entry_ratio_defaults[index]); | |
| 341 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); | |
| 342 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
| 343 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
| 344 _young_other_cost_per_region_ms_seq->add( | |
| 345 young_other_cost_per_region_ms_defaults[index]); | |
| 346 _non_young_other_cost_per_region_ms_seq->add( | |
| 347 non_young_other_cost_per_region_ms_defaults[index]); | |
| 348 | |
| 349 // </NEW PREDICTION> | |
| 350 | |
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351 // Below, we might need to calculate the pause time target based on |
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352 // the pause interval. When we do so we are going to give G1 maximum |
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353 // flexibility and allow it to do pauses when it needs to. So, we'll |
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354 // arrange that the pause interval to be pause time target + 1 to |
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355 // ensure that a) the pause time target is maximized with respect to |
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356 // the pause interval and b) we maintain the invariant that pause |
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357 // time target < pause interval. If the user does not want this |
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358 // maximum flexibility, they will have to set the pause interval |
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359 // explicitly. |
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360 |
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361 // First make sure that, if either parameter is set, its value is |
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362 // reasonable. |
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363 if (!FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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364 if (MaxGCPauseMillis < 1) { |
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365 vm_exit_during_initialization("MaxGCPauseMillis should be " |
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366 "greater than 0"); |
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367 } |
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368 } |
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369 if (!FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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370 if (GCPauseIntervalMillis < 1) { |
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371 vm_exit_during_initialization("GCPauseIntervalMillis should be " |
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372 "greater than 0"); |
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373 } |
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374 } |
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375 |
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376 // Then, if the pause time target parameter was not set, set it to |
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377 // the default value. |
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378 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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379 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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380 // The default pause time target in G1 is 200ms |
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381 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); |
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382 } else { |
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383 // We do not allow the pause interval to be set without the |
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384 // pause time target |
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385 vm_exit_during_initialization("GCPauseIntervalMillis cannot be set " |
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386 "without setting MaxGCPauseMillis"); |
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387 } |
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388 } |
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389 |
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390 // Then, if the interval parameter was not set, set it according to |
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391 // the pause time target (this will also deal with the case when the |
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392 // pause time target is the default value). |
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393 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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394 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); |
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395 } |
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396 |
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397 // Finally, make sure that the two parameters are consistent. |
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398 if (MaxGCPauseMillis >= GCPauseIntervalMillis) { |
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399 char buffer[256]; |
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400 jio_snprintf(buffer, 256, |
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401 "MaxGCPauseMillis (%u) should be less than " |
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402 "GCPauseIntervalMillis (%u)", |
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403 MaxGCPauseMillis, GCPauseIntervalMillis); |
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404 vm_exit_during_initialization(buffer); |
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405 } |
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406 |
| 751 | 407 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; |
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408 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
| 342 | 409 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); |
| 751 | 410 _sigma = (double) G1ConfidencePercent / 100.0; |
| 342 | 411 |
| 412 // start conservatively (around 50ms is about right) | |
| 413 _concurrent_mark_remark_times_ms->add(0.05); | |
| 414 _concurrent_mark_cleanup_times_ms->add(0.20); | |
| 415 _tenuring_threshold = MaxTenuringThreshold; | |
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416 // _max_survivor_regions will be calculated by |
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417 // calculate_young_list_target_length() during initialization. |
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418 _max_survivor_regions = 0; |
| 545 | 419 |
| 1356 | 420 assert(GCTimeRatio > 0, |
| 421 "we should have set it to a default value set_g1_gc_flags() " | |
| 422 "if a user set it to 0"); | |
| 423 _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); | |
| 424 | |
| 342 | 425 initialize_all(); |
| 426 } | |
| 427 | |
| 428 // Increment "i", mod "len" | |
| 429 static void inc_mod(int& i, int len) { | |
| 430 i++; if (i == len) i = 0; | |
| 431 } | |
| 432 | |
| 433 void G1CollectorPolicy::initialize_flags() { | |
| 434 set_min_alignment(HeapRegion::GrainBytes); | |
| 435 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
|
547
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436 if (SurvivorRatio < 1) { |
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437 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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438 } |
| 342 | 439 CollectorPolicy::initialize_flags(); |
| 440 } | |
| 441 | |
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442 // The easiest way to deal with the parsing of the NewSize / |
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443 // MaxNewSize / etc. parameteres is to re-use the code in the |
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444 // TwoGenerationCollectorPolicy class. This is similar to what |
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445 // ParallelScavenge does with its GenerationSizer class (see |
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446 // ParallelScavengeHeap::initialize()). We might change this in the |
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447 // future, but it's a good start. |
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448 class G1YoungGenSizer : public TwoGenerationCollectorPolicy { |
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449 size_t size_to_region_num(size_t byte_size) { |
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450 return MAX2((size_t) 1, byte_size / HeapRegion::GrainBytes); |
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451 } |
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452 |
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453 public: |
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454 G1YoungGenSizer() { |
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455 initialize_flags(); |
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456 initialize_size_info(); |
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457 } |
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458 |
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459 size_t min_young_region_num() { |
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460 return size_to_region_num(_min_gen0_size); |
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461 } |
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462 size_t initial_young_region_num() { |
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463 return size_to_region_num(_initial_gen0_size); |
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464 } |
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465 size_t max_young_region_num() { |
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466 return size_to_region_num(_max_gen0_size); |
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467 } |
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468 }; |
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469 |
| 342 | 470 void G1CollectorPolicy::init() { |
| 471 // Set aside an initial future to_space. | |
| 472 _g1 = G1CollectedHeap::heap(); | |
| 473 | |
| 474 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
| 475 | |
| 545 | 476 initialize_gc_policy_counters(); |
| 477 | |
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478 G1YoungGenSizer sizer; |
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479 size_t initial_region_num = sizer.initial_young_region_num(); |
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480 |
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481 if (UseAdaptiveSizePolicy) { |
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482 set_adaptive_young_list_length(true); |
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483 _young_list_fixed_length = 0; |
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484 } else { |
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485 set_adaptive_young_list_length(false); |
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486 _young_list_fixed_length = initial_region_num; |
| 342 | 487 } |
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488 _free_regions_at_end_of_collection = _g1->free_regions(); |
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489 calculate_young_list_min_length(); |
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490 guarantee( _young_list_min_length == 0, "invariant, not enough info" ); |
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491 calculate_young_list_target_length(); |
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492 |
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493 // We may immediately start allocating regions and placing them on the |
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494 // collection set list. Initialize the per-collection set info |
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495 start_incremental_cset_building(); |
| 342 | 496 } |
| 497 | |
| 545 | 498 // Create the jstat counters for the policy. |
| 499 void G1CollectorPolicy::initialize_gc_policy_counters() | |
| 500 { | |
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501 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 3); |
| 545 | 502 } |
| 503 | |
| 342 | 504 void G1CollectorPolicy::calculate_young_list_min_length() { |
| 505 _young_list_min_length = 0; | |
| 506 | |
| 507 if (!adaptive_young_list_length()) | |
| 508 return; | |
| 509 | |
| 510 if (_alloc_rate_ms_seq->num() > 3) { | |
| 511 double now_sec = os::elapsedTime(); | |
| 512 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; | |
| 513 double alloc_rate_ms = predict_alloc_rate_ms(); | |
| 1973 | 514 size_t min_regions = (size_t) ceil(alloc_rate_ms * when_ms); |
| 515 size_t current_region_num = _g1->young_list()->length(); | |
| 342 | 516 _young_list_min_length = min_regions + current_region_num; |
| 517 } | |
| 518 } | |
| 519 | |
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520 void G1CollectorPolicy::calculate_young_list_target_length() { |
| 342 | 521 if (adaptive_young_list_length()) { |
| 522 size_t rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); | |
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523 calculate_young_list_target_length(rs_lengths); |
| 342 | 524 } else { |
| 525 if (full_young_gcs()) | |
| 526 _young_list_target_length = _young_list_fixed_length; | |
| 527 else | |
| 528 _young_list_target_length = _young_list_fixed_length / 2; | |
| 529 } | |
| 1973 | 530 |
| 531 // Make sure we allow the application to allocate at least one | |
| 532 // region before we need to do a collection again. | |
| 533 size_t min_length = _g1->young_list()->length() + 1; | |
| 534 _young_list_target_length = MAX2(_young_list_target_length, min_length); | |
|
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535 calculate_max_gc_locker_expansion(); |
| 545 | 536 calculate_survivors_policy(); |
| 342 | 537 } |
| 538 | |
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539 void G1CollectorPolicy::calculate_young_list_target_length(size_t rs_lengths) { |
| 342 | 540 guarantee( adaptive_young_list_length(), "pre-condition" ); |
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541 guarantee( !_in_marking_window || !_last_full_young_gc, "invariant" ); |
| 342 | 542 |
| 543 double start_time_sec = os::elapsedTime(); | |
| 1282 | 544 size_t min_reserve_perc = MAX2((size_t)2, (size_t)G1ReservePercent); |
| 342 | 545 min_reserve_perc = MIN2((size_t) 50, min_reserve_perc); |
| 546 size_t reserve_regions = | |
| 547 (size_t) ((double) min_reserve_perc * (double) _g1->n_regions() / 100.0); | |
| 548 | |
| 549 if (full_young_gcs() && _free_regions_at_end_of_collection > 0) { | |
| 550 // we are in fully-young mode and there are free regions in the heap | |
| 551 | |
| 545 | 552 double survivor_regions_evac_time = |
| 553 predict_survivor_regions_evac_time(); | |
| 554 | |
| 342 | 555 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
| 556 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); | |
| 557 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); | |
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558 size_t scanned_cards = predict_young_card_num(adj_rs_lengths); |
| 545 | 559 double base_time_ms = predict_base_elapsed_time_ms(pending_cards, scanned_cards) |
| 560 + survivor_regions_evac_time; | |
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561 |
| 342 | 562 // the result |
| 563 size_t final_young_length = 0; | |
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564 |
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565 size_t init_free_regions = |
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566 MAX2((size_t)0, _free_regions_at_end_of_collection - reserve_regions); |
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567 |
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568 // if we're still under the pause target... |
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569 if (base_time_ms <= target_pause_time_ms) { |
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570 // We make sure that the shortest young length that makes sense |
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571 // fits within the target pause time. |
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572 size_t min_young_length = 1; |
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573 |
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574 if (predict_will_fit(min_young_length, base_time_ms, |
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575 init_free_regions, target_pause_time_ms)) { |
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576 // The shortest young length will fit within the target pause time; |
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577 // we'll now check whether the absolute maximum number of young |
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578 // regions will fit in the target pause time. If not, we'll do |
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579 // a binary search between min_young_length and max_young_length |
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580 size_t abs_max_young_length = _free_regions_at_end_of_collection - 1; |
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581 size_t max_young_length = abs_max_young_length; |
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582 |
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583 if (max_young_length > min_young_length) { |
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584 // Let's check if the initial max young length will fit within the |
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585 // target pause. If so then there is no need to search for a maximal |
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586 // young length - we'll return the initial maximum |
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587 |
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588 if (predict_will_fit(max_young_length, base_time_ms, |
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589 init_free_regions, target_pause_time_ms)) { |
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590 // The maximum young length will satisfy the target pause time. |
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591 // We are done so set min young length to this maximum length. |
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592 // The code after the loop will then set final_young_length using |
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593 // the value cached in the minimum length. |
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594 min_young_length = max_young_length; |
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595 } else { |
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596 // The maximum possible number of young regions will not fit within |
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597 // the target pause time so let's search.... |
| 342 | 598 |
| 599 size_t diff = (max_young_length - min_young_length) / 2; | |
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600 max_young_length = min_young_length + diff; |
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601 |
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602 while (max_young_length > min_young_length) { |
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603 if (predict_will_fit(max_young_length, base_time_ms, |
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604 init_free_regions, target_pause_time_ms)) { |
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605 |
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606 // The current max young length will fit within the target |
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607 // pause time. Note we do not exit the loop here. By setting |
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608 // min = max, and then increasing the max below means that |
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609 // we will continue searching for an upper bound in the |
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610 // range [max..max+diff] |
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611 min_young_length = max_young_length; |
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612 } |
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613 diff = (max_young_length - min_young_length) / 2; |
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614 max_young_length = min_young_length + diff; |
| 342 | 615 } |
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616 // the above loop found a maximal young length that will fit |
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617 // within the target pause time. |
| 342 | 618 } |
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619 assert(min_young_length <= abs_max_young_length, "just checking"); |
| 342 | 620 } |
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621 final_young_length = min_young_length; |
| 342 | 622 } |
| 623 } | |
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624 // and we're done! |
| 342 | 625 |
| 626 // we should have at least one region in the target young length | |
| 545 | 627 _young_list_target_length = |
| 1973 | 628 final_young_length + _recorded_survivor_regions; |
| 342 | 629 |
| 630 // let's keep an eye of how long we spend on this calculation | |
| 631 // right now, I assume that we'll print it when we need it; we | |
| 632 // should really adde it to the breakdown of a pause | |
| 633 double end_time_sec = os::elapsedTime(); | |
| 634 double elapsed_time_ms = (end_time_sec - start_time_sec) * 1000.0; | |
| 635 | |
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636 #ifdef TRACE_CALC_YOUNG_LENGTH |
| 342 | 637 // leave this in for debugging, just in case |
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638 gclog_or_tty->print_cr("target = %1.1lf ms, young = " SIZE_FORMAT ", " |
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639 "elapsed %1.2lf ms, (%s%s) " SIZE_FORMAT SIZE_FORMAT, |
| 342 | 640 target_pause_time_ms, |
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641 _young_list_target_length |
| 342 | 642 elapsed_time_ms, |
| 643 full_young_gcs() ? "full" : "partial", | |
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644 during_initial_mark_pause() ? " i-m" : "", |
| 545 | 645 _in_marking_window, |
| 646 _in_marking_window_im); | |
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647 #endif // TRACE_CALC_YOUNG_LENGTH |
| 342 | 648 |
| 649 if (_young_list_target_length < _young_list_min_length) { | |
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650 // bummer; this means that, if we do a pause when the maximal |
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651 // length dictates, we'll violate the pause spacing target (the |
| 342 | 652 // min length was calculate based on the application's current |
| 653 // alloc rate); | |
| 654 | |
| 655 // so, we have to bite the bullet, and allocate the minimum | |
| 656 // number. We'll violate our target, but we just can't meet it. | |
| 657 | |
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658 #ifdef TRACE_CALC_YOUNG_LENGTH |
| 342 | 659 // leave this in for debugging, just in case |
| 660 gclog_or_tty->print_cr("adjusted target length from " | |
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661 SIZE_FORMAT " to " SIZE_FORMAT, |
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662 _young_list_target_length, _young_list_min_length); |
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663 #endif // TRACE_CALC_YOUNG_LENGTH |
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664 |
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665 _young_list_target_length = _young_list_min_length; |
| 342 | 666 } |
| 667 } else { | |
| 668 // we are in a partially-young mode or we've run out of regions (due | |
| 669 // to evacuation failure) | |
| 670 | |
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671 #ifdef TRACE_CALC_YOUNG_LENGTH |
| 342 | 672 // leave this in for debugging, just in case |
| 673 gclog_or_tty->print_cr("(partial) setting target to " SIZE_FORMAT | |
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674 _young_list_min_length); |
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675 #endif // TRACE_CALC_YOUNG_LENGTH |
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676 // we'll do the pause as soon as possible by choosing the minimum |
| 1973 | 677 _young_list_target_length = _young_list_min_length; |
| 342 | 678 } |
| 679 | |
| 680 _rs_lengths_prediction = rs_lengths; | |
| 681 } | |
| 682 | |
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683 // This is used by: calculate_young_list_target_length(rs_length). It |
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684 // returns true iff: |
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685 // the predicted pause time for the given young list will not overflow |
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686 // the target pause time |
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687 // and: |
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688 // the predicted amount of surviving data will not overflow the |
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689 // the amount of free space available for survivor regions. |
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690 // |
| 342 | 691 bool |
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692 G1CollectorPolicy::predict_will_fit(size_t young_length, |
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693 double base_time_ms, |
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694 size_t init_free_regions, |
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695 double target_pause_time_ms) { |
| 342 | 696 |
| 697 if (young_length >= init_free_regions) | |
| 698 // end condition 1: not enough space for the young regions | |
| 699 return false; | |
| 700 | |
| 701 double accum_surv_rate_adj = 0.0; | |
| 702 double accum_surv_rate = | |
| 703 accum_yg_surv_rate_pred((int)(young_length - 1)) - accum_surv_rate_adj; | |
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704 |
| 342 | 705 size_t bytes_to_copy = |
| 706 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); | |
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707 |
| 342 | 708 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
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709 |
| 342 | 710 double young_other_time_ms = |
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711 predict_young_other_time_ms(young_length); |
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712 |
| 342 | 713 double pause_time_ms = |
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714 base_time_ms + copy_time_ms + young_other_time_ms; |
| 342 | 715 |
| 716 if (pause_time_ms > target_pause_time_ms) | |
| 717 // end condition 2: over the target pause time | |
| 718 return false; | |
| 719 | |
| 720 size_t free_bytes = | |
| 721 (init_free_regions - young_length) * HeapRegion::GrainBytes; | |
| 722 | |
| 723 if ((2.0 + sigma()) * (double) bytes_to_copy > (double) free_bytes) | |
| 724 // end condition 3: out of to-space (conservatively) | |
| 725 return false; | |
| 726 | |
| 727 // success! | |
| 728 return true; | |
| 729 } | |
| 730 | |
| 545 | 731 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
| 732 double survivor_regions_evac_time = 0.0; | |
| 733 for (HeapRegion * r = _recorded_survivor_head; | |
| 734 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
| 735 r = r->get_next_young_region()) { | |
| 736 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); | |
| 737 } | |
| 738 return survivor_regions_evac_time; | |
| 739 } | |
| 740 | |
| 342 | 741 void G1CollectorPolicy::check_prediction_validity() { |
| 742 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); | |
| 743 | |
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744 size_t rs_lengths = _g1->young_list()->sampled_rs_lengths(); |
| 342 | 745 if (rs_lengths > _rs_lengths_prediction) { |
| 746 // add 10% to avoid having to recalculate often | |
| 747 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
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748 calculate_young_list_target_length(rs_lengths_prediction); |
| 342 | 749 } |
| 750 } | |
| 751 | |
| 752 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, | |
| 753 bool is_tlab, | |
| 754 bool* gc_overhead_limit_was_exceeded) { | |
| 755 guarantee(false, "Not using this policy feature yet."); | |
| 756 return NULL; | |
| 757 } | |
| 758 | |
| 759 // This method controls how a collector handles one or more | |
| 760 // of its generations being fully allocated. | |
| 761 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
| 762 bool is_tlab) { | |
| 763 guarantee(false, "Not using this policy feature yet."); | |
| 764 return NULL; | |
| 765 } | |
| 766 | |
| 767 | |
| 768 #ifndef PRODUCT | |
| 769 bool G1CollectorPolicy::verify_young_ages() { | |
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770 HeapRegion* head = _g1->young_list()->first_region(); |
| 342 | 771 return |
| 772 verify_young_ages(head, _short_lived_surv_rate_group); | |
| 773 // also call verify_young_ages on any additional surv rate groups | |
| 774 } | |
| 775 | |
| 776 bool | |
| 777 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
| 778 SurvRateGroup *surv_rate_group) { | |
| 779 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
| 780 | |
| 781 const char* name = surv_rate_group->name(); | |
| 782 bool ret = true; | |
| 783 int prev_age = -1; | |
| 784 | |
| 785 for (HeapRegion* curr = head; | |
| 786 curr != NULL; | |
| 787 curr = curr->get_next_young_region()) { | |
| 788 SurvRateGroup* group = curr->surv_rate_group(); | |
| 789 if (group == NULL && !curr->is_survivor()) { | |
| 790 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
| 791 ret = false; | |
| 792 } | |
| 793 | |
| 794 if (surv_rate_group == group) { | |
| 795 int age = curr->age_in_surv_rate_group(); | |
| 796 | |
| 797 if (age < 0) { | |
| 798 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
| 799 ret = false; | |
| 800 } | |
| 801 | |
| 802 if (age <= prev_age) { | |
| 803 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
| 804 "(%d, %d)", name, age, prev_age); | |
| 805 ret = false; | |
| 806 } | |
| 807 prev_age = age; | |
| 808 } | |
| 809 } | |
| 810 | |
| 811 return ret; | |
| 812 } | |
| 813 #endif // PRODUCT | |
| 814 | |
| 815 void G1CollectorPolicy::record_full_collection_start() { | |
| 816 _cur_collection_start_sec = os::elapsedTime(); | |
| 817 // Release the future to-space so that it is available for compaction into. | |
| 818 _g1->set_full_collection(); | |
| 819 } | |
| 820 | |
| 821 void G1CollectorPolicy::record_full_collection_end() { | |
| 822 // Consider this like a collection pause for the purposes of allocation | |
| 823 // since last pause. | |
| 824 double end_sec = os::elapsedTime(); | |
| 825 double full_gc_time_sec = end_sec - _cur_collection_start_sec; | |
| 826 double full_gc_time_ms = full_gc_time_sec * 1000.0; | |
| 827 | |
| 828 _all_full_gc_times_ms->add(full_gc_time_ms); | |
| 829 | |
|
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830 update_recent_gc_times(end_sec, full_gc_time_ms); |
| 342 | 831 |
| 832 _g1->clear_full_collection(); | |
| 833 | |
| 834 // "Nuke" the heuristics that control the fully/partially young GC | |
| 835 // transitions and make sure we start with fully young GCs after the | |
| 836 // Full GC. | |
| 837 set_full_young_gcs(true); | |
| 838 _last_full_young_gc = false; | |
| 839 _should_revert_to_full_young_gcs = false; | |
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840 clear_initiate_conc_mark_if_possible(); |
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841 clear_during_initial_mark_pause(); |
| 342 | 842 _known_garbage_bytes = 0; |
| 843 _known_garbage_ratio = 0.0; | |
| 844 _in_marking_window = false; | |
| 845 _in_marking_window_im = false; | |
| 846 | |
| 847 _short_lived_surv_rate_group->start_adding_regions(); | |
| 848 // also call this on any additional surv rate groups | |
| 849 | |
| 545 | 850 record_survivor_regions(0, NULL, NULL); |
| 851 | |
| 342 | 852 _prev_region_num_young = _region_num_young; |
| 853 _prev_region_num_tenured = _region_num_tenured; | |
| 854 | |
| 855 _free_regions_at_end_of_collection = _g1->free_regions(); | |
| 545 | 856 // Reset survivors SurvRateGroup. |
| 857 _survivor_surv_rate_group->reset(); | |
| 342 | 858 calculate_young_list_min_length(); |
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859 calculate_young_list_target_length(); |
| 1973 | 860 } |
| 342 | 861 |
| 862 void G1CollectorPolicy::record_stop_world_start() { | |
| 863 _stop_world_start = os::elapsedTime(); | |
| 864 } | |
| 865 | |
| 866 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, | |
| 867 size_t start_used) { | |
| 868 if (PrintGCDetails) { | |
| 869 gclog_or_tty->stamp(PrintGCTimeStamps); | |
| 870 gclog_or_tty->print("[GC pause"); | |
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871 gclog_or_tty->print(" (%s)", full_young_gcs() ? "young" : "partial"); |
| 342 | 872 } |
| 873 | |
| 1973 | 874 assert(_g1->used() == _g1->recalculate_used(), |
| 875 err_msg("sanity, used: "SIZE_FORMAT" recalculate_used: "SIZE_FORMAT, | |
| 876 _g1->used(), _g1->recalculate_used())); | |
| 342 | 877 |
| 878 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
| 879 _all_stop_world_times_ms->add(s_w_t_ms); | |
| 880 _stop_world_start = 0.0; | |
| 881 | |
| 882 _cur_collection_start_sec = start_time_sec; | |
| 883 _cur_collection_pause_used_at_start_bytes = start_used; | |
| 884 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); | |
| 885 _pending_cards = _g1->pending_card_num(); | |
| 886 _max_pending_cards = _g1->max_pending_card_num(); | |
| 887 | |
| 888 _bytes_in_collection_set_before_gc = 0; | |
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889 _bytes_copied_during_gc = 0; |
| 342 | 890 |
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891 YoungList* young_list = _g1->young_list(); |
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892 _eden_bytes_before_gc = young_list->eden_used_bytes(); |
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893 _survivor_bytes_before_gc = young_list->survivor_used_bytes(); |
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894 _capacity_before_gc = _g1->capacity(); |
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895 |
| 342 | 896 #ifdef DEBUG |
| 897 // initialise these to something well known so that we can spot | |
| 898 // if they are not set properly | |
| 899 | |
| 900 for (int i = 0; i < _parallel_gc_threads; ++i) { | |
| 1611 | 901 _par_last_gc_worker_start_times_ms[i] = -1234.0; |
| 902 _par_last_ext_root_scan_times_ms[i] = -1234.0; | |
| 903 _par_last_mark_stack_scan_times_ms[i] = -1234.0; | |
| 904 _par_last_update_rs_times_ms[i] = -1234.0; | |
| 905 _par_last_update_rs_processed_buffers[i] = -1234.0; | |
| 906 _par_last_scan_rs_times_ms[i] = -1234.0; | |
| 907 _par_last_obj_copy_times_ms[i] = -1234.0; | |
| 908 _par_last_termination_times_ms[i] = -1234.0; | |
| 909 _par_last_termination_attempts[i] = -1234.0; | |
| 910 _par_last_gc_worker_end_times_ms[i] = -1234.0; | |
| 2430 | 911 _par_last_gc_worker_times_ms[i] = -1234.0; |
| 342 | 912 } |
| 913 #endif | |
| 914 | |
| 915 for (int i = 0; i < _aux_num; ++i) { | |
| 916 _cur_aux_times_ms[i] = 0.0; | |
| 917 _cur_aux_times_set[i] = false; | |
| 918 } | |
| 919 | |
| 920 _satb_drain_time_set = false; | |
| 921 _last_satb_drain_processed_buffers = -1; | |
| 922 | |
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923 _last_young_gc_full = false; |
| 342 | 924 |
| 925 // do that for any other surv rate groups | |
| 926 _short_lived_surv_rate_group->stop_adding_regions(); | |
| 1282 | 927 _survivors_age_table.clear(); |
| 545 | 928 |
| 342 | 929 assert( verify_young_ages(), "region age verification" ); |
| 930 } | |
| 931 | |
| 932 void G1CollectorPolicy::record_mark_closure_time(double mark_closure_time_ms) { | |
| 933 _mark_closure_time_ms = mark_closure_time_ms; | |
| 934 } | |
| 935 | |
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936 void G1CollectorPolicy::record_concurrent_mark_init_end(double |
| 342 | 937 mark_init_elapsed_time_ms) { |
| 938 _during_marking = true; | |
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939 assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
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940 clear_during_initial_mark_pause(); |
| 342 | 941 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
| 942 } | |
| 943 | |
| 944 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
| 945 _mark_remark_start_sec = os::elapsedTime(); | |
| 946 _during_marking = false; | |
| 947 } | |
| 948 | |
| 949 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
| 950 double end_time_sec = os::elapsedTime(); | |
| 951 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
| 952 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
| 953 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
| 954 _prev_collection_pause_end_ms += elapsed_time_ms; | |
| 955 | |
| 956 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
| 957 } | |
| 958 | |
| 959 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
| 960 _mark_cleanup_start_sec = os::elapsedTime(); | |
| 961 } | |
| 962 | |
| 963 void | |
| 964 G1CollectorPolicy::record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
| 965 size_t max_live_bytes) { | |
| 966 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
| 967 record_concurrent_mark_cleanup_end_work2(); | |
| 968 } | |
| 969 | |
| 970 void | |
| 971 G1CollectorPolicy:: | |
| 972 record_concurrent_mark_cleanup_end_work1(size_t freed_bytes, | |
| 973 size_t max_live_bytes) { | |
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974 if (_n_marks < 2) { |
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975 _n_marks++; |
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976 } |
| 342 | 977 } |
| 978 | |
| 979 // The important thing about this is that it includes "os::elapsedTime". | |
| 980 void G1CollectorPolicy::record_concurrent_mark_cleanup_end_work2() { | |
| 981 double end_time_sec = os::elapsedTime(); | |
| 982 double elapsed_time_ms = (end_time_sec - _mark_cleanup_start_sec)*1000.0; | |
| 983 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
| 984 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
| 985 _prev_collection_pause_end_ms += elapsed_time_ms; | |
| 986 | |
| 987 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_time_sec, true); | |
| 988 | |
| 989 _num_markings++; | |
| 990 _n_pauses_at_mark_end = _n_pauses; | |
| 991 _n_marks_since_last_pause++; | |
| 992 } | |
| 993 | |
| 994 void | |
| 995 G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { | |
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996 _should_revert_to_full_young_gcs = false; |
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997 _last_full_young_gc = true; |
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998 _in_marking_window = false; |
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999 if (adaptive_young_list_length()) |
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1000 calculate_young_list_target_length(); |
| 342 | 1001 } |
| 1002 | |
| 1003 void G1CollectorPolicy::record_concurrent_pause() { | |
| 1004 if (_stop_world_start > 0.0) { | |
| 1005 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
| 1006 _all_yield_times_ms->add(yield_ms); | |
| 1007 } | |
| 1008 } | |
| 1009 | |
| 1010 void G1CollectorPolicy::record_concurrent_pause_end() { | |
| 1011 } | |
| 1012 | |
| 1013 template<class T> | |
| 1014 T sum_of(T* sum_arr, int start, int n, int N) { | |
| 1015 T sum = (T)0; | |
| 1016 for (int i = 0; i < n; i++) { | |
| 1017 int j = (start + i) % N; | |
| 1018 sum += sum_arr[j]; | |
| 1019 } | |
| 1020 return sum; | |
| 1021 } | |
| 1022 | |
| 1611 | 1023 void G1CollectorPolicy::print_par_stats(int level, |
| 1024 const char* str, | |
| 2430 | 1025 double* data) { |
| 342 | 1026 double min = data[0], max = data[0]; |
| 1027 double total = 0.0; | |
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1028 LineBuffer buf(level); |
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1029 buf.append("[%s (ms):", str); |
| 342 | 1030 for (uint i = 0; i < ParallelGCThreads; ++i) { |
| 1031 double val = data[i]; | |
| 1032 if (val < min) | |
| 1033 min = val; | |
| 1034 if (val > max) | |
| 1035 max = val; | |
| 1036 total += val; | |
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1037 buf.append(" %3.1lf", val); |
| 342 | 1038 } |
| 2430 | 1039 buf.append_and_print_cr(""); |
| 1040 double avg = total / (double) ParallelGCThreads; | |
| 1041 buf.append_and_print_cr(" Avg: %5.1lf, Min: %5.1lf, Max: %5.1lf, Diff: %5.1lf]", | |
| 1042 avg, min, max, max - min); | |
| 342 | 1043 } |
| 1044 | |
| 1611 | 1045 void G1CollectorPolicy::print_par_sizes(int level, |
| 1046 const char* str, | |
| 2430 | 1047 double* data) { |
| 342 | 1048 double min = data[0], max = data[0]; |
| 1049 double total = 0.0; | |
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1050 LineBuffer buf(level); |
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1051 buf.append("[%s :", str); |
| 342 | 1052 for (uint i = 0; i < ParallelGCThreads; ++i) { |
| 1053 double val = data[i]; | |
| 1054 if (val < min) | |
| 1055 min = val; | |
| 1056 if (val > max) | |
| 1057 max = val; | |
| 1058 total += val; | |
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1059 buf.append(" %d", (int) val); |
| 342 | 1060 } |
| 2430 | 1061 buf.append_and_print_cr(""); |
| 1062 double avg = total / (double) ParallelGCThreads; | |
| 1063 buf.append_and_print_cr(" Sum: %d, Avg: %d, Min: %d, Max: %d, Diff: %d]", | |
| 1064 (int)total, (int)avg, (int)min, (int)max, (int)max - (int)min); | |
| 342 | 1065 } |
| 1066 | |
| 1067 void G1CollectorPolicy::print_stats (int level, | |
| 1068 const char* str, | |
| 1069 double value) { | |
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1070 LineBuffer(level).append_and_print_cr("[%s: %5.1lf ms]", str, value); |
| 342 | 1071 } |
| 1072 | |
| 1073 void G1CollectorPolicy::print_stats (int level, | |
| 1074 const char* str, | |
| 1075 int value) { | |
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1076 LineBuffer(level).append_and_print_cr("[%s: %d]", str, value); |
| 342 | 1077 } |
| 1078 | |
| 1079 double G1CollectorPolicy::avg_value (double* data) { | |
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1080 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 1081 double ret = 0.0; |
| 1082 for (uint i = 0; i < ParallelGCThreads; ++i) | |
| 1083 ret += data[i]; | |
| 1084 return ret / (double) ParallelGCThreads; | |
| 1085 } else { | |
| 1086 return data[0]; | |
| 1087 } | |
| 1088 } | |
| 1089 | |
| 1090 double G1CollectorPolicy::max_value (double* data) { | |
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1091 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 1092 double ret = data[0]; |
| 1093 for (uint i = 1; i < ParallelGCThreads; ++i) | |
| 1094 if (data[i] > ret) | |
| 1095 ret = data[i]; | |
| 1096 return ret; | |
| 1097 } else { | |
| 1098 return data[0]; | |
| 1099 } | |
| 1100 } | |
| 1101 | |
| 1102 double G1CollectorPolicy::sum_of_values (double* data) { | |
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1103 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 1104 double sum = 0.0; |
| 1105 for (uint i = 0; i < ParallelGCThreads; i++) | |
| 1106 sum += data[i]; | |
| 1107 return sum; | |
| 1108 } else { | |
| 1109 return data[0]; | |
| 1110 } | |
| 1111 } | |
| 1112 | |
| 1113 double G1CollectorPolicy::max_sum (double* data1, | |
| 1114 double* data2) { | |
| 1115 double ret = data1[0] + data2[0]; | |
| 1116 | |
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1117 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 1118 for (uint i = 1; i < ParallelGCThreads; ++i) { |
| 1119 double data = data1[i] + data2[i]; | |
| 1120 if (data > ret) | |
| 1121 ret = data; | |
| 1122 } | |
| 1123 } | |
| 1124 return ret; | |
| 1125 } | |
| 1126 | |
| 1127 // Anything below that is considered to be zero | |
| 1128 #define MIN_TIMER_GRANULARITY 0.0000001 | |
| 1129 | |
| 1707 | 1130 void G1CollectorPolicy::record_collection_pause_end() { |
| 342 | 1131 double end_time_sec = os::elapsedTime(); |
| 1132 double elapsed_ms = _last_pause_time_ms; | |
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1133 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
| 342 | 1134 size_t rs_size = |
| 1135 _cur_collection_pause_used_regions_at_start - collection_set_size(); | |
| 1136 size_t cur_used_bytes = _g1->used(); | |
| 1137 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
| 1138 bool last_pause_included_initial_mark = false; | |
| 1707 | 1139 bool update_stats = !_g1->evacuation_failed(); |
| 342 | 1140 |
| 1141 #ifndef PRODUCT | |
| 1142 if (G1YoungSurvRateVerbose) { | |
| 1143 gclog_or_tty->print_cr(""); | |
| 1144 _short_lived_surv_rate_group->print(); | |
| 1145 // do that for any other surv rate groups too | |
| 1146 } | |
| 1147 #endif // PRODUCT | |
| 1148 | |
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1149 last_pause_included_initial_mark = during_initial_mark_pause(); |
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1150 if (last_pause_included_initial_mark) |
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1151 record_concurrent_mark_init_end(0.0); |
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1152 |
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1153 size_t marking_initiating_used_threshold = |
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1154 (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
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1155 |
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1156 if (!_g1->mark_in_progress() && !_last_full_young_gc) { |
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1157 assert(!last_pause_included_initial_mark, "invariant"); |
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1158 if (cur_used_bytes > marking_initiating_used_threshold) { |
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1159 if (cur_used_bytes > _prev_collection_pause_used_at_end_bytes) { |
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1160 assert(!during_initial_mark_pause(), "we should not see this here"); |
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1161 |
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1162 ergo_verbose3(ErgoConcCycles, |
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1163 "request concurrent cycle initiation", |
|
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1164 ergo_format_reason("occupancy higher than threshold") |
|
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1165 ergo_format_byte("occupancy") |
|
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1166 ergo_format_byte_perc("threshold"), |
|
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1167 cur_used_bytes, |
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1168 marking_initiating_used_threshold, |
|
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1169 (double) InitiatingHeapOccupancyPercent); |
|
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1170 |
|
1359
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1171 // Note: this might have already been set, if during the last |
|
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1172 // pause we decided to start a cycle but at the beginning of |
|
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1173 // this pause we decided to postpone it. That's OK. |
|
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1174 set_initiate_conc_mark_if_possible(); |
|
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1175 } else { |
|
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1176 ergo_verbose2(ErgoConcCycles, |
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1177 "do not request concurrent cycle initiation", |
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1178 ergo_format_reason("occupancy lower than previous occupancy") |
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1179 ergo_format_byte("occupancy") |
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1180 ergo_format_byte("previous occupancy"), |
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1181 cur_used_bytes, |
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1182 _prev_collection_pause_used_at_end_bytes); |
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1183 } |
| 342 | 1184 } |
| 1185 } | |
| 1186 | |
|
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1187 _prev_collection_pause_used_at_end_bytes = cur_used_bytes; |
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1188 |
| 342 | 1189 _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0, |
| 1190 end_time_sec, false); | |
| 1191 | |
| 1192 guarantee(_cur_collection_pause_used_regions_at_start >= | |
| 1193 collection_set_size(), | |
| 1194 "Negative RS size?"); | |
| 1195 | |
| 1196 // This assert is exempted when we're doing parallel collection pauses, | |
| 1197 // because the fragmentation caused by the parallel GC allocation buffers | |
| 1198 // can lead to more memory being used during collection than was used | |
| 1199 // before. Best leave this out until the fragmentation problem is fixed. | |
| 1200 // Pauses in which evacuation failed can also lead to negative | |
| 1201 // collections, since no space is reclaimed from a region containing an | |
| 1202 // object whose evacuation failed. | |
| 1203 // Further, we're now always doing parallel collection. But I'm still | |
| 1204 // leaving this here as a placeholder for a more precise assertion later. | |
| 1205 // (DLD, 10/05.) | |
| 1206 assert((true || parallel) // Always using GC LABs now. | |
| 1207 || _g1->evacuation_failed() | |
| 1208 || _cur_collection_pause_used_at_start_bytes >= cur_used_bytes, | |
| 1209 "Negative collection"); | |
| 1210 | |
| 1211 size_t freed_bytes = | |
| 1212 _cur_collection_pause_used_at_start_bytes - cur_used_bytes; | |
| 1213 size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; | |
|
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1214 |
| 342 | 1215 double survival_fraction = |
| 1216 (double)surviving_bytes/ | |
| 1217 (double)_collection_set_bytes_used_before; | |
| 1218 | |
| 1219 _n_pauses++; | |
| 1220 | |
|
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1221 double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); |
|
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1222 double mark_stack_scan_time = avg_value(_par_last_mark_stack_scan_times_ms); |
|
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1223 double update_rs_time = avg_value(_par_last_update_rs_times_ms); |
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1224 double update_rs_processed_buffers = |
|
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1225 sum_of_values(_par_last_update_rs_processed_buffers); |
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1226 double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); |
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1227 double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); |
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1228 double termination_time = avg_value(_par_last_termination_times_ms); |
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1229 |
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1230 double parallel_known_time = update_rs_time + |
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1231 ext_root_scan_time + |
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1232 mark_stack_scan_time + |
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1233 scan_rs_time + |
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1234 obj_copy_time + |
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1235 termination_time; |
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1236 |
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1237 double parallel_other_time = _cur_collection_par_time_ms - parallel_known_time; |
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1238 |
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1239 PauseSummary* summary = _summary; |
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1240 |
|
595
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1241 if (update_stats) { |
|
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1242 _recent_rs_scan_times_ms->add(scan_rs_time); |
| 342 | 1243 _recent_pause_times_ms->add(elapsed_ms); |
| 1244 _recent_rs_sizes->add(rs_size); | |
| 1245 | |
|
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1246 MainBodySummary* body_summary = summary->main_body_summary(); |
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1247 guarantee(body_summary != NULL, "should not be null!"); |
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1248 |
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1249 if (_satb_drain_time_set) |
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1250 body_summary->record_satb_drain_time_ms(_cur_satb_drain_time_ms); |
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1251 else |
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1252 body_summary->record_satb_drain_time_ms(0.0); |
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1253 |
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1254 body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); |
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1255 body_summary->record_mark_stack_scan_time_ms(mark_stack_scan_time); |
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1256 body_summary->record_update_rs_time_ms(update_rs_time); |
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1257 body_summary->record_scan_rs_time_ms(scan_rs_time); |
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1258 body_summary->record_obj_copy_time_ms(obj_copy_time); |
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1259 if (parallel) { |
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1260 body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); |
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1261 body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); |
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1262 body_summary->record_termination_time_ms(termination_time); |
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1263 body_summary->record_parallel_other_time_ms(parallel_other_time); |
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1264 } |
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1265 body_summary->record_mark_closure_time_ms(_mark_closure_time_ms); |
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1266 |
| 342 | 1267 // We exempt parallel collection from this check because Alloc Buffer |
| 1268 // fragmentation can produce negative collections. Same with evac | |
| 1269 // failure. | |
| 1270 // Further, we're now always doing parallel collection. But I'm still | |
| 1271 // leaving this here as a placeholder for a more precise assertion later. | |
| 1272 // (DLD, 10/05. | |
| 1273 assert((true || parallel) | |
| 1274 || _g1->evacuation_failed() | |
| 1275 || surviving_bytes <= _collection_set_bytes_used_before, | |
| 1276 "Or else negative collection!"); | |
| 1277 _recent_CS_bytes_used_before->add(_collection_set_bytes_used_before); | |
| 1278 _recent_CS_bytes_surviving->add(surviving_bytes); | |
| 1279 | |
| 1280 // this is where we update the allocation rate of the application | |
| 1281 double app_time_ms = | |
| 1282 (_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms); | |
| 1283 if (app_time_ms < MIN_TIMER_GRANULARITY) { | |
| 1284 // This usually happens due to the timer not having the required | |
| 1285 // granularity. Some Linuxes are the usual culprits. | |
| 1286 // We'll just set it to something (arbitrarily) small. | |
| 1287 app_time_ms = 1.0; | |
| 1288 } | |
| 1289 size_t regions_allocated = | |
| 1290 (_region_num_young - _prev_region_num_young) + | |
| 1291 (_region_num_tenured - _prev_region_num_tenured); | |
| 1292 double alloc_rate_ms = (double) regions_allocated / app_time_ms; | |
| 1293 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
| 1294 _prev_region_num_young = _region_num_young; | |
| 1295 _prev_region_num_tenured = _region_num_tenured; | |
| 1296 | |
| 1297 double interval_ms = | |
| 1298 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
| 1299 update_recent_gc_times(end_time_sec, elapsed_ms); | |
| 1300 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; | |
|
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1301 if (recent_avg_pause_time_ratio() < 0.0 || |
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1302 (recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
|
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1303 #ifndef PRODUCT |
|
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1304 // Dump info to allow post-facto debugging |
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1305 gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
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1306 gclog_or_tty->print_cr("-------------------------------------------"); |
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1307 gclog_or_tty->print_cr("Recent GC Times (ms):"); |
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1308 _recent_gc_times_ms->dump(); |
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1309 gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
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1310 _recent_prev_end_times_for_all_gcs_sec->dump(); |
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1311 gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
|
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1312 _recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
|
1087
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1313 // In debug mode, terminate the JVM if the user wants to debug at this point. |
|
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1314 assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
|
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1315 #endif // !PRODUCT |
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1316 // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
|
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1317 // CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
|
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1318 if (_recent_avg_pause_time_ratio < 0.0) { |
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1319 _recent_avg_pause_time_ratio = 0.0; |
|
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|
1320 } else { |
|
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|
1321 assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
|
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|
1322 _recent_avg_pause_time_ratio = 1.0; |
|
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|
1323 } |
|
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|
1324 } |
| 342 | 1325 } |
| 1326 | |
| 1327 if (G1PolicyVerbose > 1) { | |
| 1328 gclog_or_tty->print_cr(" Recording collection pause(%d)", _n_pauses); | |
| 1329 } | |
| 1330 | |
| 1331 if (G1PolicyVerbose > 1) { | |
| 1332 gclog_or_tty->print_cr(" ET: %10.6f ms (avg: %10.6f ms)\n" | |
| 1333 " ET-RS: %10.6f ms (avg: %10.6f ms)\n" | |
| 1334 " |RS|: " SIZE_FORMAT, | |
| 1335 elapsed_ms, recent_avg_time_for_pauses_ms(), | |
|
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|
1336 scan_rs_time, recent_avg_time_for_rs_scan_ms(), |
| 342 | 1337 rs_size); |
| 1338 | |
| 1339 gclog_or_tty->print_cr(" Used at start: " SIZE_FORMAT"K" | |
| 1340 " At end " SIZE_FORMAT "K\n" | |
| 1341 " garbage : " SIZE_FORMAT "K" | |
| 1342 " of " SIZE_FORMAT "K\n" | |
| 1343 " survival : %6.2f%% (%6.2f%% avg)", | |
| 1344 _cur_collection_pause_used_at_start_bytes/K, | |
| 1345 _g1->used()/K, freed_bytes/K, | |
| 1346 _collection_set_bytes_used_before/K, | |
| 1347 survival_fraction*100.0, | |
| 1348 recent_avg_survival_fraction()*100.0); | |
| 1349 gclog_or_tty->print_cr(" Recent %% gc pause time: %6.2f", | |
| 1350 recent_avg_pause_time_ratio() * 100.0); | |
| 1351 } | |
| 1352 | |
| 1353 double other_time_ms = elapsed_ms; | |
| 1354 | |
| 1707 | 1355 if (_satb_drain_time_set) { |
| 1356 other_time_ms -= _cur_satb_drain_time_ms; | |
| 1357 } | |
| 1358 | |
| 1359 if (parallel) { | |
| 1360 other_time_ms -= _cur_collection_par_time_ms + _cur_clear_ct_time_ms; | |
| 1361 } else { | |
| 1362 other_time_ms -= | |
| 1363 update_rs_time + | |
| 1364 ext_root_scan_time + mark_stack_scan_time + | |
| 1365 scan_rs_time + obj_copy_time; | |
| 342 | 1366 } |
| 1367 | |
| 1368 if (PrintGCDetails) { | |
| 1707 | 1369 gclog_or_tty->print_cr("%s, %1.8lf secs]", |
| 342 | 1370 (last_pause_included_initial_mark) ? " (initial-mark)" : "", |
| 1371 elapsed_ms / 1000.0); | |
| 1372 | |
| 1707 | 1373 if (_satb_drain_time_set) { |
| 1374 print_stats(1, "SATB Drain Time", _cur_satb_drain_time_ms); | |
| 1375 } | |
| 1376 if (_last_satb_drain_processed_buffers >= 0) { | |
| 1377 print_stats(2, "Processed Buffers", _last_satb_drain_processed_buffers); | |
| 1378 } | |
| 1379 if (parallel) { | |
| 1380 print_stats(1, "Parallel Time", _cur_collection_par_time_ms); | |
| 2430 | 1381 print_par_stats(2, "GC Worker Start Time", _par_last_gc_worker_start_times_ms); |
| 1707 | 1382 print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); |
| 2430 | 1383 print_par_sizes(3, "Processed Buffers", _par_last_update_rs_processed_buffers); |
| 1384 print_par_stats(2, "Ext Root Scanning", _par_last_ext_root_scan_times_ms); | |
| 1385 print_par_stats(2, "Mark Stack Scanning", _par_last_mark_stack_scan_times_ms); | |
| 1707 | 1386 print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms); |
| 1387 print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms); | |
| 1388 print_par_stats(2, "Termination", _par_last_termination_times_ms); | |
| 2430 | 1389 print_par_sizes(3, "Termination Attempts", _par_last_termination_attempts); |
| 1390 print_par_stats(2, "GC Worker End Time", _par_last_gc_worker_end_times_ms); | |
| 1391 | |
| 1392 for (int i = 0; i < _parallel_gc_threads; i++) { | |
| 1393 _par_last_gc_worker_times_ms[i] = _par_last_gc_worker_end_times_ms[i] - _par_last_gc_worker_start_times_ms[i]; | |
| 1394 } | |
| 1395 print_par_stats(2, "GC Worker Times", _par_last_gc_worker_times_ms); | |
| 1396 | |
|
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|
1397 print_stats(2, "Parallel Other", parallel_other_time); |
| 1707 | 1398 print_stats(1, "Clear CT", _cur_clear_ct_time_ms); |
| 1399 } else { | |
| 1400 print_stats(1, "Update RS", update_rs_time); | |
| 1401 print_stats(2, "Processed Buffers", | |
| 1402 (int)update_rs_processed_buffers); | |
| 1403 print_stats(1, "Ext Root Scanning", ext_root_scan_time); | |
| 1404 print_stats(1, "Mark Stack Scanning", mark_stack_scan_time); | |
| 1405 print_stats(1, "Scan RS", scan_rs_time); | |
| 1406 print_stats(1, "Object Copying", obj_copy_time); | |
| 342 | 1407 } |
|
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|
1408 #ifndef PRODUCT |
|
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|
1409 print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms); |
|
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|
1410 print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms); |
|
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|
1411 print_stats(1, "Min Clear CC", _min_clear_cc_time_ms); |
|
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|
1412 print_stats(1, "Max Clear CC", _max_clear_cc_time_ms); |
|
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|
1413 if (_num_cc_clears > 0) { |
|
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|
1414 print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears)); |
|
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|
1415 } |
|
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|
1416 #endif |
| 342 | 1417 print_stats(1, "Other", other_time_ms); |
|
1394
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|
1418 print_stats(2, "Choose CSet", _recorded_young_cset_choice_time_ms); |
|
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|
1419 |
| 342 | 1420 for (int i = 0; i < _aux_num; ++i) { |
| 1421 if (_cur_aux_times_set[i]) { | |
| 1422 char buffer[96]; | |
| 1423 sprintf(buffer, "Aux%d", i); | |
| 1424 print_stats(1, buffer, _cur_aux_times_ms[i]); | |
| 1425 } | |
| 1426 } | |
| 1427 } | |
| 1428 | |
| 1429 _all_pause_times_ms->add(elapsed_ms); | |
|
648
2314b7336582
6820321: G1: Error: guarantee(check_nums(total, n, parts), "all seq lengths should match")
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diff
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|
1430 if (update_stats) { |
|
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|
1431 summary->record_total_time_ms(elapsed_ms); |
|
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|
1432 summary->record_other_time_ms(other_time_ms); |
|
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|
1433 } |
| 342 | 1434 for (int i = 0; i < _aux_num; ++i) |
| 1435 if (_cur_aux_times_set[i]) | |
| 1436 _all_aux_times_ms[i].add(_cur_aux_times_ms[i]); | |
| 1437 | |
| 1438 // Reset marks-between-pauses counter. | |
| 1439 _n_marks_since_last_pause = 0; | |
| 1440 | |
| 1441 // Update the efficiency-since-mark vars. | |
| 1442 double proc_ms = elapsed_ms * (double) _parallel_gc_threads; | |
| 1443 if (elapsed_ms < MIN_TIMER_GRANULARITY) { | |
| 1444 // This usually happens due to the timer not having the required | |
| 1445 // granularity. Some Linuxes are the usual culprits. | |
| 1446 // We'll just set it to something (arbitrarily) small. | |
| 1447 proc_ms = 1.0; | |
| 1448 } | |
| 1449 double cur_efficiency = (double) freed_bytes / proc_ms; | |
| 1450 | |
| 1451 bool new_in_marking_window = _in_marking_window; | |
| 1452 bool new_in_marking_window_im = false; | |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
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|
1453 if (during_initial_mark_pause()) { |
| 342 | 1454 new_in_marking_window = true; |
| 1455 new_in_marking_window_im = true; | |
| 1456 } | |
| 1457 | |
|
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|
1458 if (_last_full_young_gc) { |
|
3914
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|
1459 ergo_verbose2(ErgoPartiallyYoungGCs, |
|
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
1460 "start partially-young GCs", |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
1461 ergo_format_byte_perc("known garbage"), |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
1462 _known_garbage_bytes, _known_garbage_ratio * 100.0); |
|
3867
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|
1463 set_full_young_gcs(false); |
|
ff53346271fe
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|
1464 _last_full_young_gc = false; |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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|
1465 } |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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|
1466 |
|
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6814390: G1: remove the concept of non-generational G1
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|
1467 if ( !_last_young_gc_full ) { |
|
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
1468 if (_should_revert_to_full_young_gcs) { |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
1469 ergo_verbose2(ErgoPartiallyYoungGCs, |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
1470 "end partially-young GCs", |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
1471 ergo_format_reason("partially-young GCs end requested") |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3868
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|
1472 ergo_format_byte_perc("known garbage"), |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3868
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|
1473 _known_garbage_bytes, _known_garbage_ratio * 100.0); |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3868
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|
1474 set_full_young_gcs(true); |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
1475 } else if (_known_garbage_ratio < 0.05) { |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
1476 ergo_verbose3(ErgoPartiallyYoungGCs, |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
1477 "end partially-young GCs", |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
1478 ergo_format_reason("known garbage percent lower than threshold") |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
1479 ergo_format_byte_perc("known garbage") |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3868
diff
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|
1480 ergo_format_perc("threshold"), |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
1481 _known_garbage_bytes, _known_garbage_ratio * 100.0, |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
1482 0.05 * 100.0); |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
1483 set_full_young_gcs(true); |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
1484 } else if (adaptive_young_list_length() && |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
1485 (get_gc_eff_factor() * cur_efficiency < predict_young_gc_eff())) { |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
1486 ergo_verbose5(ErgoPartiallyYoungGCs, |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
1487 "end partially-young GCs", |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
1488 ergo_format_reason("current GC efficiency lower than " |
|
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
1489 "predicted fully-young GC efficiency") |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
1490 ergo_format_double("GC efficiency factor") |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
1491 ergo_format_double("current GC efficiency") |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
1492 ergo_format_double("predicted fully-young GC efficiency") |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3868
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|
1493 ergo_format_byte_perc("known garbage"), |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
1494 get_gc_eff_factor(), cur_efficiency, |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
1495 predict_young_gc_eff(), |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
1496 _known_garbage_bytes, _known_garbage_ratio * 100.0); |
|
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|
1497 set_full_young_gcs(true); |
| 342 | 1498 } |
|
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|
1499 } |
|
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|
1500 _should_revert_to_full_young_gcs = false; |
|
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|
1501 |
|
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|
1502 if (_last_young_gc_full && !_during_marking) { |
|
ff53346271fe
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diff
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|
1503 _young_gc_eff_seq->add(cur_efficiency); |
| 342 | 1504 } |
| 1505 | |
| 1506 _short_lived_surv_rate_group->start_adding_regions(); | |
| 1507 // do that for any other surv rate groupsx | |
| 1508 | |
| 1509 // <NEW PREDICTION> | |
| 1510 | |
| 677 | 1511 if (update_stats) { |
| 342 | 1512 double pause_time_ms = elapsed_ms; |
| 1513 | |
| 1514 size_t diff = 0; | |
| 1515 if (_max_pending_cards >= _pending_cards) | |
| 1516 diff = _max_pending_cards - _pending_cards; | |
| 1517 _pending_card_diff_seq->add((double) diff); | |
| 1518 | |
| 1519 double cost_per_card_ms = 0.0; | |
| 1520 if (_pending_cards > 0) { | |
| 1521 cost_per_card_ms = update_rs_time / (double) _pending_cards; | |
| 1522 _cost_per_card_ms_seq->add(cost_per_card_ms); | |
| 1523 } | |
| 1524 | |
| 1525 size_t cards_scanned = _g1->cards_scanned(); | |
| 1526 | |
| 1527 double cost_per_entry_ms = 0.0; | |
| 1528 if (cards_scanned > 10) { | |
| 1529 cost_per_entry_ms = scan_rs_time / (double) cards_scanned; | |
| 1530 if (_last_young_gc_full) | |
| 1531 _cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
| 1532 else | |
| 1533 _partially_young_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
| 1534 } | |
| 1535 | |
| 1536 if (_max_rs_lengths > 0) { | |
| 1537 double cards_per_entry_ratio = | |
| 1538 (double) cards_scanned / (double) _max_rs_lengths; | |
| 1539 if (_last_young_gc_full) | |
| 1540 _fully_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
| 1541 else | |
| 1542 _partially_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
| 1543 } | |
| 1544 | |
| 1545 size_t rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; | |
| 1546 if (rs_length_diff >= 0) | |
| 1547 _rs_length_diff_seq->add((double) rs_length_diff); | |
| 1548 | |
| 1549 size_t copied_bytes = surviving_bytes; | |
| 1550 double cost_per_byte_ms = 0.0; | |
| 1551 if (copied_bytes > 0) { | |
| 1552 cost_per_byte_ms = obj_copy_time / (double) copied_bytes; | |
| 1553 if (_in_marking_window) | |
| 1554 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); | |
| 1555 else | |
| 1556 _cost_per_byte_ms_seq->add(cost_per_byte_ms); | |
| 1557 } | |
| 1558 | |
| 1559 double all_other_time_ms = pause_time_ms - | |
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1560 (update_rs_time + scan_rs_time + obj_copy_time + |
| 342 | 1561 _mark_closure_time_ms + termination_time); |
| 1562 | |
| 1563 double young_other_time_ms = 0.0; | |
| 1564 if (_recorded_young_regions > 0) { | |
| 1565 young_other_time_ms = | |
| 1566 _recorded_young_cset_choice_time_ms + | |
| 1567 _recorded_young_free_cset_time_ms; | |
| 1568 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / | |
| 1569 (double) _recorded_young_regions); | |
| 1570 } | |
| 1571 double non_young_other_time_ms = 0.0; | |
| 1572 if (_recorded_non_young_regions > 0) { | |
| 1573 non_young_other_time_ms = | |
| 1574 _recorded_non_young_cset_choice_time_ms + | |
| 1575 _recorded_non_young_free_cset_time_ms; | |
| 1576 | |
| 1577 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
| 1578 (double) _recorded_non_young_regions); | |
| 1579 } | |
| 1580 | |
| 1581 double constant_other_time_ms = all_other_time_ms - | |
| 1582 (young_other_time_ms + non_young_other_time_ms); | |
| 1583 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
| 1584 | |
| 1585 double survival_ratio = 0.0; | |
| 1586 if (_bytes_in_collection_set_before_gc > 0) { | |
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1587 survival_ratio = (double) _bytes_copied_during_gc / |
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1588 (double) _bytes_in_collection_set_before_gc; |
| 342 | 1589 } |
| 1590 | |
| 1591 _pending_cards_seq->add((double) _pending_cards); | |
| 1592 _scanned_cards_seq->add((double) cards_scanned); | |
| 1593 _rs_lengths_seq->add((double) _max_rs_lengths); | |
| 1594 | |
| 1595 double expensive_region_limit_ms = | |
| 751 | 1596 (double) MaxGCPauseMillis - predict_constant_other_time_ms(); |
| 342 | 1597 if (expensive_region_limit_ms < 0.0) { |
| 1598 // this means that the other time was predicted to be longer than | |
| 1599 // than the max pause time | |
| 751 | 1600 expensive_region_limit_ms = (double) MaxGCPauseMillis; |
| 342 | 1601 } |
| 1602 _expensive_region_limit_ms = expensive_region_limit_ms; | |
| 1603 | |
| 1604 if (PREDICTIONS_VERBOSE) { | |
| 1605 gclog_or_tty->print_cr(""); | |
| 1606 gclog_or_tty->print_cr("PREDICTIONS %1.4lf %d " | |
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1607 "REGIONS %d %d %d " |
| 342 | 1608 "PENDING_CARDS %d %d " |
| 1609 "CARDS_SCANNED %d %d " | |
| 1610 "RS_LENGTHS %d %d " | |
| 1611 "RS_UPDATE %1.6lf %1.6lf RS_SCAN %1.6lf %1.6lf " | |
| 1612 "SURVIVAL_RATIO %1.6lf %1.6lf " | |
| 1613 "OBJECT_COPY %1.6lf %1.6lf OTHER_CONSTANT %1.6lf %1.6lf " | |
| 1614 "OTHER_YOUNG %1.6lf %1.6lf " | |
| 1615 "OTHER_NON_YOUNG %1.6lf %1.6lf " | |
| 1616 "VTIME_DIFF %1.6lf TERMINATION %1.6lf " | |
| 1617 "ELAPSED %1.6lf %1.6lf ", | |
| 1618 _cur_collection_start_sec, | |
| 1619 (!_last_young_gc_full) ? 2 : | |
| 1620 (last_pause_included_initial_mark) ? 1 : 0, | |
| 1621 _recorded_region_num, | |
| 1622 _recorded_young_regions, | |
| 1623 _recorded_non_young_regions, | |
| 1624 _predicted_pending_cards, _pending_cards, | |
| 1625 _predicted_cards_scanned, cards_scanned, | |
| 1626 _predicted_rs_lengths, _max_rs_lengths, | |
| 1627 _predicted_rs_update_time_ms, update_rs_time, | |
| 1628 _predicted_rs_scan_time_ms, scan_rs_time, | |
| 1629 _predicted_survival_ratio, survival_ratio, | |
| 1630 _predicted_object_copy_time_ms, obj_copy_time, | |
| 1631 _predicted_constant_other_time_ms, constant_other_time_ms, | |
| 1632 _predicted_young_other_time_ms, young_other_time_ms, | |
| 1633 _predicted_non_young_other_time_ms, | |
| 1634 non_young_other_time_ms, | |
| 1635 _vtime_diff_ms, termination_time, | |
| 1636 _predicted_pause_time_ms, elapsed_ms); | |
| 1637 } | |
| 1638 | |
| 1639 if (G1PolicyVerbose > 0) { | |
| 1640 gclog_or_tty->print_cr("Pause Time, predicted: %1.4lfms (predicted %s), actual: %1.4lfms", | |
| 1641 _predicted_pause_time_ms, | |
| 1642 (_within_target) ? "within" : "outside", | |
| 1643 elapsed_ms); | |
| 1644 } | |
| 1645 | |
| 1646 } | |
| 1647 | |
| 1648 _in_marking_window = new_in_marking_window; | |
| 1649 _in_marking_window_im = new_in_marking_window_im; | |
| 1650 _free_regions_at_end_of_collection = _g1->free_regions(); | |
| 1651 calculate_young_list_min_length(); | |
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1652 calculate_young_list_target_length(); |
| 342 | 1653 |
| 1111 | 1654 // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
| 1282 | 1655 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
| 1111 | 1656 adjust_concurrent_refinement(update_rs_time, update_rs_processed_buffers, update_rs_time_goal_ms); |
| 342 | 1657 // </NEW PREDICTION> |
| 1658 } | |
| 1659 | |
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1660 #define EXT_SIZE_FORMAT "%d%s" |
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1661 #define EXT_SIZE_PARAMS(bytes) \ |
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1662 byte_size_in_proper_unit((bytes)), \ |
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1663 proper_unit_for_byte_size((bytes)) |
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1664 |
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1665 void G1CollectorPolicy::print_heap_transition() { |
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1666 if (PrintGCDetails) { |
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1667 YoungList* young_list = _g1->young_list(); |
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1668 size_t eden_bytes = young_list->eden_used_bytes(); |
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1669 size_t survivor_bytes = young_list->survivor_used_bytes(); |
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1670 size_t used_before_gc = _cur_collection_pause_used_at_start_bytes; |
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1671 size_t used = _g1->used(); |
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1672 size_t capacity = _g1->capacity(); |
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1673 |
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1674 gclog_or_tty->print_cr( |
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1675 " [Eden: "EXT_SIZE_FORMAT"->"EXT_SIZE_FORMAT" " |
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1676 "Survivors: "EXT_SIZE_FORMAT"->"EXT_SIZE_FORMAT" " |
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1677 "Heap: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->" |
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1678 EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")]", |
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1679 EXT_SIZE_PARAMS(_eden_bytes_before_gc), |
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1680 EXT_SIZE_PARAMS(eden_bytes), |
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1681 EXT_SIZE_PARAMS(_survivor_bytes_before_gc), |
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1682 EXT_SIZE_PARAMS(survivor_bytes), |
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1683 EXT_SIZE_PARAMS(used_before_gc), |
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1684 EXT_SIZE_PARAMS(_capacity_before_gc), |
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1685 EXT_SIZE_PARAMS(used), |
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1686 EXT_SIZE_PARAMS(capacity)); |
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1687 } else if (PrintGC) { |
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1688 _g1->print_size_transition(gclog_or_tty, |
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1689 _cur_collection_pause_used_at_start_bytes, |
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1690 _g1->used(), _g1->capacity()); |
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1691 } |
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1692 } |
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1693 |
| 342 | 1694 // <NEW PREDICTION> |
| 1695 | |
| 1111 | 1696 void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
| 1697 double update_rs_processed_buffers, | |
| 1698 double goal_ms) { | |
| 1699 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 1700 ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); | |
| 1701 | |
| 1282 | 1702 if (G1UseAdaptiveConcRefinement) { |
| 1111 | 1703 const int k_gy = 3, k_gr = 6; |
| 1704 const double inc_k = 1.1, dec_k = 0.9; | |
| 1705 | |
| 1706 int g = cg1r->green_zone(); | |
| 1707 if (update_rs_time > goal_ms) { | |
| 1708 g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. | |
| 1709 } else { | |
| 1710 if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { | |
| 1711 g = (int)MAX2(g * inc_k, g + 1.0); | |
| 1712 } | |
| 1713 } | |
| 1714 // Change the refinement threads params | |
| 1715 cg1r->set_green_zone(g); | |
| 1716 cg1r->set_yellow_zone(g * k_gy); | |
| 1717 cg1r->set_red_zone(g * k_gr); | |
| 1718 cg1r->reinitialize_threads(); | |
| 1719 | |
| 1720 int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); | |
| 1721 int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, | |
| 1722 cg1r->yellow_zone()); | |
| 1723 // Change the barrier params | |
| 1724 dcqs.set_process_completed_threshold(processing_threshold); | |
| 1725 dcqs.set_max_completed_queue(cg1r->red_zone()); | |
| 1726 } | |
| 1727 | |
| 1728 int curr_queue_size = dcqs.completed_buffers_num(); | |
| 1729 if (curr_queue_size >= cg1r->yellow_zone()) { | |
| 1730 dcqs.set_completed_queue_padding(curr_queue_size); | |
| 1731 } else { | |
| 1732 dcqs.set_completed_queue_padding(0); | |
| 1733 } | |
| 1734 dcqs.notify_if_necessary(); | |
| 1735 } | |
| 1736 | |
| 342 | 1737 double |
| 1738 G1CollectorPolicy:: | |
| 1739 predict_young_collection_elapsed_time_ms(size_t adjustment) { | |
| 1740 guarantee( adjustment == 0 || adjustment == 1, "invariant" ); | |
| 1741 | |
| 1742 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
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1743 size_t young_num = g1h->young_list()->length(); |
| 342 | 1744 if (young_num == 0) |
| 1745 return 0.0; | |
| 1746 | |
| 1747 young_num += adjustment; | |
| 1748 size_t pending_cards = predict_pending_cards(); | |
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1749 size_t rs_lengths = g1h->young_list()->sampled_rs_lengths() + |
| 342 | 1750 predict_rs_length_diff(); |
| 1751 size_t card_num; | |
| 1752 if (full_young_gcs()) | |
| 1753 card_num = predict_young_card_num(rs_lengths); | |
| 1754 else | |
| 1755 card_num = predict_non_young_card_num(rs_lengths); | |
| 1756 size_t young_byte_size = young_num * HeapRegion::GrainBytes; | |
| 1757 double accum_yg_surv_rate = | |
| 1758 _short_lived_surv_rate_group->accum_surv_rate(adjustment); | |
| 1759 | |
| 1760 size_t bytes_to_copy = | |
| 1761 (size_t) (accum_yg_surv_rate * (double) HeapRegion::GrainBytes); | |
| 1762 | |
| 1763 return | |
| 1764 predict_rs_update_time_ms(pending_cards) + | |
| 1765 predict_rs_scan_time_ms(card_num) + | |
| 1766 predict_object_copy_time_ms(bytes_to_copy) + | |
| 1767 predict_young_other_time_ms(young_num) + | |
| 1768 predict_constant_other_time_ms(); | |
| 1769 } | |
| 1770 | |
| 1771 double | |
| 1772 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { | |
| 1773 size_t rs_length = predict_rs_length_diff(); | |
| 1774 size_t card_num; | |
| 1775 if (full_young_gcs()) | |
| 1776 card_num = predict_young_card_num(rs_length); | |
| 1777 else | |
| 1778 card_num = predict_non_young_card_num(rs_length); | |
| 1779 return predict_base_elapsed_time_ms(pending_cards, card_num); | |
| 1780 } | |
| 1781 | |
| 1782 double | |
| 1783 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
| 1784 size_t scanned_cards) { | |
| 1785 return | |
| 1786 predict_rs_update_time_ms(pending_cards) + | |
| 1787 predict_rs_scan_time_ms(scanned_cards) + | |
| 1788 predict_constant_other_time_ms(); | |
| 1789 } | |
| 1790 | |
| 1791 double | |
| 1792 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
| 1793 bool young) { | |
| 1794 size_t rs_length = hr->rem_set()->occupied(); | |
| 1795 size_t card_num; | |
| 1796 if (full_young_gcs()) | |
| 1797 card_num = predict_young_card_num(rs_length); | |
| 1798 else | |
| 1799 card_num = predict_non_young_card_num(rs_length); | |
| 1800 size_t bytes_to_copy = predict_bytes_to_copy(hr); | |
| 1801 | |
| 1802 double region_elapsed_time_ms = | |
| 1803 predict_rs_scan_time_ms(card_num) + | |
| 1804 predict_object_copy_time_ms(bytes_to_copy); | |
| 1805 | |
| 1806 if (young) | |
| 1807 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
| 1808 else | |
| 1809 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
| 1810 | |
| 1811 return region_elapsed_time_ms; | |
| 1812 } | |
| 1813 | |
| 1814 size_t | |
| 1815 G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { | |
| 1816 size_t bytes_to_copy; | |
| 1817 if (hr->is_marked()) | |
| 1818 bytes_to_copy = hr->max_live_bytes(); | |
| 1819 else { | |
| 1820 guarantee( hr->is_young() && hr->age_in_surv_rate_group() != -1, | |
| 1821 "invariant" ); | |
| 1822 int age = hr->age_in_surv_rate_group(); | |
| 545 | 1823 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
| 342 | 1824 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
| 1825 } | |
| 1826 | |
| 1827 return bytes_to_copy; | |
| 1828 } | |
| 1829 | |
| 1830 void | |
| 1831 G1CollectorPolicy::start_recording_regions() { | |
| 1832 _recorded_rs_lengths = 0; | |
| 1833 _recorded_young_regions = 0; | |
| 1834 _recorded_non_young_regions = 0; | |
| 1835 | |
| 1836 #if PREDICTIONS_VERBOSE | |
| 1837 _recorded_marked_bytes = 0; | |
| 1838 _recorded_young_bytes = 0; | |
| 1839 _predicted_bytes_to_copy = 0; | |
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1840 _predicted_rs_lengths = 0; |
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1841 _predicted_cards_scanned = 0; |
| 342 | 1842 #endif // PREDICTIONS_VERBOSE |
| 1843 } | |
| 1844 | |
| 1845 void | |
|
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1846 G1CollectorPolicy::record_cset_region_info(HeapRegion* hr, bool young) { |
| 342 | 1847 #if PREDICTIONS_VERBOSE |
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1848 if (!young) { |
| 342 | 1849 _recorded_marked_bytes += hr->max_live_bytes(); |
| 1850 } | |
| 1851 _predicted_bytes_to_copy += predict_bytes_to_copy(hr); | |
| 1852 #endif // PREDICTIONS_VERBOSE | |
| 1853 | |
| 1854 size_t rs_length = hr->rem_set()->occupied(); | |
| 1855 _recorded_rs_lengths += rs_length; | |
| 1856 } | |
| 1857 | |
| 1858 void | |
|
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1859 G1CollectorPolicy::record_non_young_cset_region(HeapRegion* hr) { |
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1860 assert(!hr->is_young(), "should not call this"); |
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1861 ++_recorded_non_young_regions; |
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1862 record_cset_region_info(hr, false); |
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1863 } |
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1864 |
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1865 void |
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1866 G1CollectorPolicy::set_recorded_young_regions(size_t n_regions) { |
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1867 _recorded_young_regions = n_regions; |
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1868 } |
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1869 |
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1870 void G1CollectorPolicy::set_recorded_young_bytes(size_t bytes) { |
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1871 #if PREDICTIONS_VERBOSE |
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1872 _recorded_young_bytes = bytes; |
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1873 #endif // PREDICTIONS_VERBOSE |
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1874 } |
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1875 |
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1876 void G1CollectorPolicy::set_recorded_rs_lengths(size_t rs_lengths) { |
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1877 _recorded_rs_lengths = rs_lengths; |
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1878 } |
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1879 |
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1880 void G1CollectorPolicy::set_predicted_bytes_to_copy(size_t bytes) { |
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1881 _predicted_bytes_to_copy = bytes; |
| 342 | 1882 } |
| 1883 | |
| 1884 void | |
| 1885 G1CollectorPolicy::end_recording_regions() { | |
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1886 // The _predicted_pause_time_ms field is referenced in code |
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1887 // not under PREDICTIONS_VERBOSE. Let's initialize it. |
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1888 _predicted_pause_time_ms = -1.0; |
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1889 |
| 342 | 1890 #if PREDICTIONS_VERBOSE |
| 1891 _predicted_pending_cards = predict_pending_cards(); | |
| 1892 _predicted_rs_lengths = _recorded_rs_lengths + predict_rs_length_diff(); | |
| 1893 if (full_young_gcs()) | |
| 1894 _predicted_cards_scanned += predict_young_card_num(_predicted_rs_lengths); | |
| 1895 else | |
| 1896 _predicted_cards_scanned += | |
| 1897 predict_non_young_card_num(_predicted_rs_lengths); | |
| 1898 _recorded_region_num = _recorded_young_regions + _recorded_non_young_regions; | |
| 1899 | |
| 1900 _predicted_rs_update_time_ms = | |
| 1901 predict_rs_update_time_ms(_g1->pending_card_num()); | |
| 1902 _predicted_rs_scan_time_ms = | |
| 1903 predict_rs_scan_time_ms(_predicted_cards_scanned); | |
| 1904 _predicted_object_copy_time_ms = | |
| 1905 predict_object_copy_time_ms(_predicted_bytes_to_copy); | |
| 1906 _predicted_constant_other_time_ms = | |
| 1907 predict_constant_other_time_ms(); | |
| 1908 _predicted_young_other_time_ms = | |
| 1909 predict_young_other_time_ms(_recorded_young_regions); | |
| 1910 _predicted_non_young_other_time_ms = | |
| 1911 predict_non_young_other_time_ms(_recorded_non_young_regions); | |
| 1912 | |
| 1913 _predicted_pause_time_ms = | |
| 1914 _predicted_rs_update_time_ms + | |
| 1915 _predicted_rs_scan_time_ms + | |
| 1916 _predicted_object_copy_time_ms + | |
| 1917 _predicted_constant_other_time_ms + | |
| 1918 _predicted_young_other_time_ms + | |
| 1919 _predicted_non_young_other_time_ms; | |
| 1920 #endif // PREDICTIONS_VERBOSE | |
| 1921 } | |
| 1922 | |
| 1923 void G1CollectorPolicy::check_if_region_is_too_expensive(double | |
| 1924 predicted_time_ms) { | |
| 1925 // I don't think we need to do this when in young GC mode since | |
| 1926 // marking will be initiated next time we hit the soft limit anyway... | |
| 1927 if (predicted_time_ms > _expensive_region_limit_ms) { | |
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1928 ergo_verbose2(ErgoPartiallyYoungGCs, |
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1929 "request partially-young GCs end", |
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1930 ergo_format_reason("predicted region time higher than threshold") |
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1931 ergo_format_ms("predicted region time") |
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1932 ergo_format_ms("threshold"), |
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1933 predicted_time_ms, _expensive_region_limit_ms); |
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1934 // no point in doing another partial one |
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1935 _should_revert_to_full_young_gcs = true; |
| 342 | 1936 } |
| 1937 } | |
| 1938 | |
| 1939 // </NEW PREDICTION> | |
| 1940 | |
| 1941 | |
| 1942 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, | |
| 1943 double elapsed_ms) { | |
| 1944 _recent_gc_times_ms->add(elapsed_ms); | |
| 1945 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
| 1946 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
| 1947 } | |
| 1948 | |
| 1949 double G1CollectorPolicy::recent_avg_time_for_pauses_ms() { | |
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1950 if (_recent_pause_times_ms->num() == 0) { |
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1951 return (double) MaxGCPauseMillis; |
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1952 } |
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1953 return _recent_pause_times_ms->avg(); |
| 342 | 1954 } |
| 1955 | |
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1956 double G1CollectorPolicy::recent_avg_time_for_rs_scan_ms() { |
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1957 if (_recent_rs_scan_times_ms->num() == 0) { |
| 751 | 1958 return (double)MaxGCPauseMillis/3.0; |
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1959 } |
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1960 return _recent_rs_scan_times_ms->avg(); |
| 342 | 1961 } |
| 1962 | |
| 1963 int G1CollectorPolicy::number_of_recent_gcs() { | |
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1964 assert(_recent_rs_scan_times_ms->num() == |
| 342 | 1965 _recent_pause_times_ms->num(), "Sequence out of sync"); |
| 1966 assert(_recent_pause_times_ms->num() == | |
| 1967 _recent_CS_bytes_used_before->num(), "Sequence out of sync"); | |
| 1968 assert(_recent_CS_bytes_used_before->num() == | |
| 1969 _recent_CS_bytes_surviving->num(), "Sequence out of sync"); | |
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1970 |
| 342 | 1971 return _recent_pause_times_ms->num(); |
| 1972 } | |
| 1973 | |
| 1974 double G1CollectorPolicy::recent_avg_survival_fraction() { | |
| 1975 return recent_avg_survival_fraction_work(_recent_CS_bytes_surviving, | |
| 1976 _recent_CS_bytes_used_before); | |
| 1977 } | |
| 1978 | |
| 1979 double G1CollectorPolicy::last_survival_fraction() { | |
| 1980 return last_survival_fraction_work(_recent_CS_bytes_surviving, | |
| 1981 _recent_CS_bytes_used_before); | |
| 1982 } | |
| 1983 | |
| 1984 double | |
| 1985 G1CollectorPolicy::recent_avg_survival_fraction_work(TruncatedSeq* surviving, | |
| 1986 TruncatedSeq* before) { | |
| 1987 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
| 1988 if (before->sum() > 0.0) { | |
| 1989 double recent_survival_rate = surviving->sum() / before->sum(); | |
| 1990 // We exempt parallel collection from this check because Alloc Buffer | |
| 1991 // fragmentation can produce negative collections. | |
| 1992 // Further, we're now always doing parallel collection. But I'm still | |
| 1993 // leaving this here as a placeholder for a more precise assertion later. | |
| 1994 // (DLD, 10/05.) | |
|
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1995 assert((true || G1CollectedHeap::use_parallel_gc_threads()) || |
| 342 | 1996 _g1->evacuation_failed() || |
| 1997 recent_survival_rate <= 1.0, "Or bad frac"); | |
| 1998 return recent_survival_rate; | |
| 1999 } else { | |
| 2000 return 1.0; // Be conservative. | |
| 2001 } | |
| 2002 } | |
| 2003 | |
| 2004 double | |
| 2005 G1CollectorPolicy::last_survival_fraction_work(TruncatedSeq* surviving, | |
| 2006 TruncatedSeq* before) { | |
| 2007 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
| 2008 if (surviving->num() > 0 && before->last() > 0.0) { | |
| 2009 double last_survival_rate = surviving->last() / before->last(); | |
| 2010 // We exempt parallel collection from this check because Alloc Buffer | |
| 2011 // fragmentation can produce negative collections. | |
| 2012 // Further, we're now always doing parallel collection. But I'm still | |
| 2013 // leaving this here as a placeholder for a more precise assertion later. | |
| 2014 // (DLD, 10/05.) | |
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2015 assert((true || G1CollectedHeap::use_parallel_gc_threads()) || |
| 342 | 2016 last_survival_rate <= 1.0, "Or bad frac"); |
| 2017 return last_survival_rate; | |
| 2018 } else { | |
| 2019 return 1.0; | |
| 2020 } | |
| 2021 } | |
| 2022 | |
| 2023 static const int survival_min_obs = 5; | |
| 2024 static double survival_min_obs_limits[] = { 0.9, 0.7, 0.5, 0.3, 0.1 }; | |
| 2025 static const double min_survival_rate = 0.1; | |
| 2026 | |
| 2027 double | |
| 2028 G1CollectorPolicy::conservative_avg_survival_fraction_work(double avg, | |
| 2029 double latest) { | |
| 2030 double res = avg; | |
| 2031 if (number_of_recent_gcs() < survival_min_obs) { | |
| 2032 res = MAX2(res, survival_min_obs_limits[number_of_recent_gcs()]); | |
| 2033 } | |
| 2034 res = MAX2(res, latest); | |
| 2035 res = MAX2(res, min_survival_rate); | |
| 2036 // In the parallel case, LAB fragmentation can produce "negative | |
| 2037 // collections"; so can evac failure. Cap at 1.0 | |
| 2038 res = MIN2(res, 1.0); | |
| 2039 return res; | |
| 2040 } | |
| 2041 | |
| 2042 size_t G1CollectorPolicy::expansion_amount() { | |
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2043 double recent_gc_overhead = recent_avg_pause_time_ratio() * 100.0; |
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2044 double threshold = _gc_overhead_perc; |
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2045 if (recent_gc_overhead > threshold) { |
| 751 | 2046 // We will double the existing space, or take |
| 2047 // G1ExpandByPercentOfAvailable % of the available expansion | |
| 2048 // space, whichever is smaller, bounded below by a minimum | |
| 2049 // expansion (unless that's all that's left.) | |
| 342 | 2050 const size_t min_expand_bytes = 1*M; |
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2051 size_t reserved_bytes = _g1->max_capacity(); |
| 342 | 2052 size_t committed_bytes = _g1->capacity(); |
| 2053 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
| 2054 size_t expand_bytes; | |
| 2055 size_t expand_bytes_via_pct = | |
| 751 | 2056 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
| 342 | 2057 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
| 2058 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
| 2059 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
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2060 |
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2061 ergo_verbose5(ErgoHeapSizing, |
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2062 "attempt heap expansion", |
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2063 ergo_format_reason("recent GC overhead higher than " |
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2064 "threshold after GC") |
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2065 ergo_format_perc("recent GC overhead") |
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2066 ergo_format_perc("threshold") |
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2067 ergo_format_byte("uncommitted") |
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2068 ergo_format_byte_perc("calculated expansion amount"), |
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2069 recent_gc_overhead, threshold, |
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2070 uncommitted_bytes, |
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2071 expand_bytes_via_pct, (double) G1ExpandByPercentOfAvailable); |
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2072 |
| 342 | 2073 return expand_bytes; |
| 2074 } else { | |
| 2075 return 0; | |
| 2076 } | |
| 2077 } | |
| 2078 | |
| 2079 void G1CollectorPolicy::note_start_of_mark_thread() { | |
| 2080 _mark_thread_startup_sec = os::elapsedTime(); | |
| 2081 } | |
| 2082 | |
| 2083 class CountCSClosure: public HeapRegionClosure { | |
| 2084 G1CollectorPolicy* _g1_policy; | |
| 2085 public: | |
| 2086 CountCSClosure(G1CollectorPolicy* g1_policy) : | |
| 2087 _g1_policy(g1_policy) {} | |
| 2088 bool doHeapRegion(HeapRegion* r) { | |
| 2089 _g1_policy->_bytes_in_collection_set_before_gc += r->used(); | |
| 2090 return false; | |
| 2091 } | |
| 2092 }; | |
| 2093 | |
| 2094 void G1CollectorPolicy::count_CS_bytes_used() { | |
| 2095 CountCSClosure cs_closure(this); | |
| 2096 _g1->collection_set_iterate(&cs_closure); | |
| 2097 } | |
| 2098 | |
| 2099 void G1CollectorPolicy::print_summary (int level, | |
| 2100 const char* str, | |
| 2101 NumberSeq* seq) const { | |
| 2102 double sum = seq->sum(); | |
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2103 LineBuffer(level + 1).append_and_print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", |
| 342 | 2104 str, sum / 1000.0, seq->avg()); |
| 2105 } | |
| 2106 | |
| 2107 void G1CollectorPolicy::print_summary_sd (int level, | |
| 2108 const char* str, | |
| 2109 NumberSeq* seq) const { | |
| 2110 print_summary(level, str, seq); | |
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2111 LineBuffer(level + 6).append_and_print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", |
| 342 | 2112 seq->num(), seq->sd(), seq->maximum()); |
| 2113 } | |
| 2114 | |
| 2115 void G1CollectorPolicy::check_other_times(int level, | |
| 2116 NumberSeq* other_times_ms, | |
| 2117 NumberSeq* calc_other_times_ms) const { | |
| 2118 bool should_print = false; | |
|
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|
2119 LineBuffer buf(level + 2); |
| 342 | 2120 |
| 2121 double max_sum = MAX2(fabs(other_times_ms->sum()), | |
| 2122 fabs(calc_other_times_ms->sum())); | |
| 2123 double min_sum = MIN2(fabs(other_times_ms->sum()), | |
| 2124 fabs(calc_other_times_ms->sum())); | |
| 2125 double sum_ratio = max_sum / min_sum; | |
| 2126 if (sum_ratio > 1.1) { | |
| 2127 should_print = true; | |
|
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|
2128 buf.append_and_print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); |
| 342 | 2129 } |
| 2130 | |
| 2131 double max_avg = MAX2(fabs(other_times_ms->avg()), | |
| 2132 fabs(calc_other_times_ms->avg())); | |
| 2133 double min_avg = MIN2(fabs(other_times_ms->avg()), | |
| 2134 fabs(calc_other_times_ms->avg())); | |
| 2135 double avg_ratio = max_avg / min_avg; | |
| 2136 if (avg_ratio > 1.1) { | |
| 2137 should_print = true; | |
|
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|
2138 buf.append_and_print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); |
| 342 | 2139 } |
| 2140 | |
| 2141 if (other_times_ms->sum() < -0.01) { | |
|
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|
2142 buf.append_and_print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); |
| 342 | 2143 } |
| 2144 | |
| 2145 if (other_times_ms->avg() < -0.01) { | |
|
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|
2146 buf.append_and_print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); |
| 342 | 2147 } |
| 2148 | |
| 2149 if (calc_other_times_ms->sum() < -0.01) { | |
| 2150 should_print = true; | |
|
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2151 buf.append_and_print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); |
| 342 | 2152 } |
| 2153 | |
| 2154 if (calc_other_times_ms->avg() < -0.01) { | |
| 2155 should_print = true; | |
|
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|
2156 buf.append_and_print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); |
| 342 | 2157 } |
| 2158 | |
| 2159 if (should_print) | |
| 2160 print_summary(level, "Other(Calc)", calc_other_times_ms); | |
| 2161 } | |
| 2162 | |
| 2163 void G1CollectorPolicy::print_summary(PauseSummary* summary) const { | |
|
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|
2164 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
| 342 | 2165 MainBodySummary* body_summary = summary->main_body_summary(); |
| 2166 if (summary->get_total_seq()->num() > 0) { | |
| 677 | 2167 print_summary_sd(0, "Evacuation Pauses", summary->get_total_seq()); |
| 342 | 2168 if (body_summary != NULL) { |
| 2169 print_summary(1, "SATB Drain", body_summary->get_satb_drain_seq()); | |
| 2170 if (parallel) { | |
| 2171 print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); | |
| 2172 print_summary(2, "Update RS", body_summary->get_update_rs_seq()); | |
| 2173 print_summary(2, "Ext Root Scanning", | |
| 2174 body_summary->get_ext_root_scan_seq()); | |
| 2175 print_summary(2, "Mark Stack Scanning", | |
| 2176 body_summary->get_mark_stack_scan_seq()); | |
| 2177 print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); | |
| 2178 print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); | |
| 2179 print_summary(2, "Termination", body_summary->get_termination_seq()); | |
| 2180 print_summary(2, "Other", body_summary->get_parallel_other_seq()); | |
| 2181 { | |
| 2182 NumberSeq* other_parts[] = { | |
| 2183 body_summary->get_update_rs_seq(), | |
| 2184 body_summary->get_ext_root_scan_seq(), | |
| 2185 body_summary->get_mark_stack_scan_seq(), | |
| 2186 body_summary->get_scan_rs_seq(), | |
| 2187 body_summary->get_obj_copy_seq(), | |
| 2188 body_summary->get_termination_seq() | |
| 2189 }; | |
| 2190 NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), | |
| 1779 | 2191 6, other_parts); |
| 342 | 2192 check_other_times(2, body_summary->get_parallel_other_seq(), |
| 2193 &calc_other_times_ms); | |
| 2194 } | |
| 2195 print_summary(1, "Mark Closure", body_summary->get_mark_closure_seq()); | |
| 2196 print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); | |
| 2197 } else { | |
| 2198 print_summary(1, "Update RS", body_summary->get_update_rs_seq()); | |
| 2199 print_summary(1, "Ext Root Scanning", | |
| 2200 body_summary->get_ext_root_scan_seq()); | |
| 2201 print_summary(1, "Mark Stack Scanning", | |
| 2202 body_summary->get_mark_stack_scan_seq()); | |
| 2203 print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); | |
| 2204 print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); | |
| 2205 } | |
| 2206 } | |
| 2207 print_summary(1, "Other", summary->get_other_seq()); | |
| 2208 { | |
| 1779 | 2209 if (body_summary != NULL) { |
| 2210 NumberSeq calc_other_times_ms; | |
| 2211 if (parallel) { | |
| 2212 // parallel | |
| 2213 NumberSeq* other_parts[] = { | |
| 2214 body_summary->get_satb_drain_seq(), | |
| 2215 body_summary->get_parallel_seq(), | |
| 2216 body_summary->get_clear_ct_seq() | |
| 2217 }; | |
| 2218 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
| 2219 3, other_parts); | |
| 2220 } else { | |
| 2221 // serial | |
| 2222 NumberSeq* other_parts[] = { | |
| 2223 body_summary->get_satb_drain_seq(), | |
| 2224 body_summary->get_update_rs_seq(), | |
| 2225 body_summary->get_ext_root_scan_seq(), | |
| 2226 body_summary->get_mark_stack_scan_seq(), | |
| 2227 body_summary->get_scan_rs_seq(), | |
| 2228 body_summary->get_obj_copy_seq() | |
| 2229 }; | |
| 2230 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
| 2231 6, other_parts); | |
| 2232 } | |
| 2233 check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); | |
| 342 | 2234 } |
| 2235 } | |
| 2236 } else { | |
|
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2237 LineBuffer(1).append_and_print_cr("none"); |
| 342 | 2238 } |
|
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2239 LineBuffer(0).append_and_print_cr(""); |
| 342 | 2240 } |
| 2241 | |
| 2242 void G1CollectorPolicy::print_tracing_info() const { | |
| 2243 if (TraceGen0Time) { | |
| 2244 gclog_or_tty->print_cr("ALL PAUSES"); | |
| 2245 print_summary_sd(0, "Total", _all_pause_times_ms); | |
| 2246 gclog_or_tty->print_cr(""); | |
| 2247 gclog_or_tty->print_cr(""); | |
| 2248 gclog_or_tty->print_cr(" Full Young GC Pauses: %8d", _full_young_pause_num); | |
| 2249 gclog_or_tty->print_cr(" Partial Young GC Pauses: %8d", _partial_young_pause_num); | |
| 2250 gclog_or_tty->print_cr(""); | |
| 2251 | |
| 677 | 2252 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
| 2253 print_summary(_summary); | |
| 342 | 2254 |
| 2255 gclog_or_tty->print_cr("MISC"); | |
| 2256 print_summary_sd(0, "Stop World", _all_stop_world_times_ms); | |
| 2257 print_summary_sd(0, "Yields", _all_yield_times_ms); | |
| 2258 for (int i = 0; i < _aux_num; ++i) { | |
| 2259 if (_all_aux_times_ms[i].num() > 0) { | |
| 2260 char buffer[96]; | |
| 2261 sprintf(buffer, "Aux%d", i); | |
| 2262 print_summary_sd(0, buffer, &_all_aux_times_ms[i]); | |
| 2263 } | |
| 2264 } | |
| 2265 | |
| 2266 size_t all_region_num = _region_num_young + _region_num_tenured; | |
| 2267 gclog_or_tty->print_cr(" New Regions %8d, Young %8d (%6.2lf%%), " | |
| 2268 "Tenured %8d (%6.2lf%%)", | |
| 2269 all_region_num, | |
| 2270 _region_num_young, | |
| 2271 (double) _region_num_young / (double) all_region_num * 100.0, | |
| 2272 _region_num_tenured, | |
| 2273 (double) _region_num_tenured / (double) all_region_num * 100.0); | |
| 2274 } | |
| 2275 if (TraceGen1Time) { | |
| 2276 if (_all_full_gc_times_ms->num() > 0) { | |
| 2277 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", | |
| 2278 _all_full_gc_times_ms->num(), | |
| 2279 _all_full_gc_times_ms->sum() / 1000.0); | |
| 2280 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); | |
| 2281 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", | |
| 2282 _all_full_gc_times_ms->sd(), | |
| 2283 _all_full_gc_times_ms->maximum()); | |
| 2284 } | |
| 2285 } | |
| 2286 } | |
| 2287 | |
| 2288 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
| 2289 #ifndef PRODUCT | |
| 2290 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
| 2291 // add this call for any other surv rate groups | |
| 2292 #endif // PRODUCT | |
| 2293 } | |
| 2294 | |
|
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2295 void G1CollectorPolicy::update_region_num(bool young) { |
| 1973 | 2296 if (young) { |
| 342 | 2297 ++_region_num_young; |
| 2298 } else { | |
| 2299 ++_region_num_tenured; | |
| 2300 } | |
| 2301 } | |
| 2302 | |
| 2303 #ifndef PRODUCT | |
| 2304 // for debugging, bit of a hack... | |
| 2305 static char* | |
| 2306 region_num_to_mbs(int length) { | |
| 2307 static char buffer[64]; | |
| 2308 double bytes = (double) (length * HeapRegion::GrainBytes); | |
| 2309 double mbs = bytes / (double) (1024 * 1024); | |
| 2310 sprintf(buffer, "%7.2lfMB", mbs); | |
| 2311 return buffer; | |
| 2312 } | |
| 2313 #endif // PRODUCT | |
| 2314 | |
| 545 | 2315 size_t G1CollectorPolicy::max_regions(int purpose) { |
| 342 | 2316 switch (purpose) { |
| 2317 case GCAllocForSurvived: | |
| 545 | 2318 return _max_survivor_regions; |
| 342 | 2319 case GCAllocForTenured: |
| 545 | 2320 return REGIONS_UNLIMITED; |
| 342 | 2321 default: |
| 545 | 2322 ShouldNotReachHere(); |
| 2323 return REGIONS_UNLIMITED; | |
| 342 | 2324 }; |
| 2325 } | |
| 2326 | |
|
1991
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|
2327 void G1CollectorPolicy::calculate_max_gc_locker_expansion() { |
|
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|
2328 size_t expansion_region_num = 0; |
|
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|
2329 if (GCLockerEdenExpansionPercent > 0) { |
|
016a3628c885
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diff
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|
2330 double perc = (double) GCLockerEdenExpansionPercent / 100.0; |
|
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|
2331 double expansion_region_num_d = perc * (double) _young_list_target_length; |
|
016a3628c885
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diff
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|
2332 // We use ceiling so that if expansion_region_num_d is > 0.0 (but |
|
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|
2333 // less than 1.0) we'll get 1. |
|
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|
2334 expansion_region_num = (size_t) ceil(expansion_region_num_d); |
|
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|
2335 } else { |
|
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diff
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|
2336 assert(expansion_region_num == 0, "sanity"); |
|
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|
2337 } |
|
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|
2338 _young_list_max_length = _young_list_target_length + expansion_region_num; |
|
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|
2339 assert(_young_list_target_length <= _young_list_max_length, "post-condition"); |
|
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|
2340 } |
|
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|
2341 |
| 545 | 2342 // Calculates survivor space parameters. |
| 2343 void G1CollectorPolicy::calculate_survivors_policy() | |
| 2344 { | |
|
3868
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3867
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|
2345 _max_survivor_regions = _young_list_target_length / SurvivorRatio; |
|
ae73da50be4b
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|
2346 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( |
| 545 | 2347 HeapRegion::GrainWords * _max_survivor_regions); |
| 2348 } | |
| 2349 | |
| 342 | 2350 #ifndef PRODUCT |
| 2351 class HRSortIndexIsOKClosure: public HeapRegionClosure { | |
| 2352 CollectionSetChooser* _chooser; | |
| 2353 public: | |
| 2354 HRSortIndexIsOKClosure(CollectionSetChooser* chooser) : | |
| 2355 _chooser(chooser) {} | |
| 2356 | |
| 2357 bool doHeapRegion(HeapRegion* r) { | |
| 2358 if (!r->continuesHumongous()) { | |
| 2359 assert(_chooser->regionProperlyOrdered(r), "Ought to be."); | |
| 2360 } | |
| 2361 return false; | |
| 2362 } | |
| 2363 }; | |
| 2364 | |
| 2365 bool G1CollectorPolicy_BestRegionsFirst::assertMarkedBytesDataOK() { | |
| 2366 HRSortIndexIsOKClosure cl(_collectionSetChooser); | |
| 2367 _g1->heap_region_iterate(&cl); | |
| 2368 return true; | |
| 2369 } | |
| 2370 #endif | |
| 2371 | |
|
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2372 bool G1CollectorPolicy::force_initial_mark_if_outside_cycle( |
|
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|
2373 GCCause::Cause gc_cause) { |
|
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|
2374 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
|
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|
2375 if (!during_cycle) { |
|
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2376 ergo_verbose1(ErgoConcCycles, |
|
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|
2377 "request concurrent cycle initiation", |
|
20213c8a3c40
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|
2378 ergo_format_reason("requested by GC cause") |
|
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|
2379 ergo_format_str("GC cause"), |
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|
2380 GCCause::to_string(gc_cause)); |
|
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|
2381 set_initiate_conc_mark_if_possible(); |
|
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|
2382 return true; |
|
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|
2383 } else { |
|
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|
2384 ergo_verbose1(ErgoConcCycles, |
|
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|
2385 "do not request concurrent cycle initiation", |
|
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|
2386 ergo_format_reason("concurrent cycle already in progress") |
|
20213c8a3c40
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|
2387 ergo_format_str("GC cause"), |
|
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|
2388 GCCause::to_string(gc_cause)); |
|
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|
2389 return false; |
|
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|
2390 } |
|
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|
2391 } |
|
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|
2392 |
| 342 | 2393 void |
|
1359
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|
2394 G1CollectorPolicy::decide_on_conc_mark_initiation() { |
|
23b1b27ac76c
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diff
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|
2395 // We are about to decide on whether this pause will be an |
|
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|
2396 // initial-mark pause. |
|
23b1b27ac76c
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|
2397 |
|
23b1b27ac76c
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|
2398 // First, during_initial_mark_pause() should not be already set. We |
|
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2399 // will set it here if we have to. However, it should be cleared by |
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2400 // the end of the pause (it's only set for the duration of an |
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2401 // initial-mark pause). |
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2402 assert(!during_initial_mark_pause(), "pre-condition"); |
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2403 |
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2404 if (initiate_conc_mark_if_possible()) { |
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2405 // We had noticed on a previous pause that the heap occupancy has |
|
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2406 // gone over the initiating threshold and we should start a |
|
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2407 // concurrent marking cycle. So we might initiate one. |
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2408 |
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2409 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2410 if (!during_cycle) { |
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2411 // The concurrent marking thread is not "during a cycle", i.e., |
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2412 // it has completed the last one. So we can go ahead and |
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2413 // initiate a new cycle. |
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2414 |
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2415 set_during_initial_mark_pause(); |
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2416 |
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2417 // And we can now clear initiate_conc_mark_if_possible() as |
|
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2418 // we've already acted on it. |
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2419 clear_initiate_conc_mark_if_possible(); |
|
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2420 |
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2421 ergo_verbose0(ErgoConcCycles, |
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2422 "initiate concurrent cycle", |
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2423 ergo_format_reason("concurrent cycle initiation requested")); |
|
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2424 } else { |
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2425 // The concurrent marking thread is still finishing up the |
|
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2426 // previous cycle. If we start one right now the two cycles |
|
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2427 // overlap. In particular, the concurrent marking thread might |
|
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2428 // be in the process of clearing the next marking bitmap (which |
|
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2429 // we will use for the next cycle if we start one). Starting a |
|
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2430 // cycle now will be bad given that parts of the marking |
|
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2431 // information might get cleared by the marking thread. And we |
|
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2432 // cannot wait for the marking thread to finish the cycle as it |
|
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2433 // periodically yields while clearing the next marking bitmap |
|
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2434 // and, if it's in a yield point, it's waiting for us to |
|
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2435 // finish. So, at this point we will not start a cycle and we'll |
|
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2436 // let the concurrent marking thread complete the last one. |
|
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2437 ergo_verbose0(ErgoConcCycles, |
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2438 "do not initiate concurrent cycle", |
|
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2439 ergo_format_reason("concurrent cycle already in progress")); |
|
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2440 } |
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2441 } |
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2442 } |
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2443 |
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2444 void |
| 342 | 2445 G1CollectorPolicy_BestRegionsFirst:: |
| 2446 record_collection_pause_start(double start_time_sec, size_t start_used) { | |
| 2447 G1CollectorPolicy::record_collection_pause_start(start_time_sec, start_used); | |
| 2448 } | |
| 2449 | |
| 2450 class KnownGarbageClosure: public HeapRegionClosure { | |
| 2451 CollectionSetChooser* _hrSorted; | |
| 2452 | |
| 2453 public: | |
| 2454 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
| 2455 _hrSorted(hrSorted) | |
| 2456 {} | |
| 2457 | |
| 2458 bool doHeapRegion(HeapRegion* r) { | |
| 2459 // We only include humongous regions in collection | |
| 2460 // sets when concurrent mark shows that their contained object is | |
| 2461 // unreachable. | |
| 2462 | |
| 2463 // Do we have any marking information for this region? | |
| 2464 if (r->is_marked()) { | |
| 2465 // We don't include humongous regions in collection | |
| 2466 // sets because we collect them immediately at the end of a marking | |
| 2467 // cycle. We also don't include young regions because we *must* | |
| 2468 // include them in the next collection pause. | |
| 2469 if (!r->isHumongous() && !r->is_young()) { | |
| 2470 _hrSorted->addMarkedHeapRegion(r); | |
| 2471 } | |
| 2472 } | |
| 2473 return false; | |
| 2474 } | |
| 2475 }; | |
| 2476 | |
| 2477 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
| 2478 CollectionSetChooser* _hrSorted; | |
| 2479 jint _marked_regions_added; | |
| 2480 jint _chunk_size; | |
| 2481 jint _cur_chunk_idx; | |
| 2482 jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) | |
| 2483 int _worker; | |
| 2484 int _invokes; | |
| 2485 | |
| 2486 void get_new_chunk() { | |
| 2487 _cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size); | |
| 2488 _cur_chunk_end = _cur_chunk_idx + _chunk_size; | |
| 2489 } | |
| 2490 void add_region(HeapRegion* r) { | |
| 2491 if (_cur_chunk_idx == _cur_chunk_end) { | |
| 2492 get_new_chunk(); | |
| 2493 } | |
| 2494 assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); | |
| 2495 _hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r); | |
| 2496 _marked_regions_added++; | |
| 2497 _cur_chunk_idx++; | |
| 2498 } | |
| 2499 | |
| 2500 public: | |
| 2501 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
| 2502 jint chunk_size, | |
| 2503 int worker) : | |
| 2504 _hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker), | |
| 2505 _marked_regions_added(0), _cur_chunk_idx(0), _cur_chunk_end(0), | |
| 2506 _invokes(0) | |
| 2507 {} | |
| 2508 | |
| 2509 bool doHeapRegion(HeapRegion* r) { | |
| 2510 // We only include humongous regions in collection | |
| 2511 // sets when concurrent mark shows that their contained object is | |
| 2512 // unreachable. | |
| 2513 _invokes++; | |
| 2514 | |
| 2515 // Do we have any marking information for this region? | |
| 2516 if (r->is_marked()) { | |
| 2517 // We don't include humongous regions in collection | |
| 2518 // sets because we collect them immediately at the end of a marking | |
| 2519 // cycle. | |
| 2520 // We also do not include young regions in collection sets | |
| 2521 if (!r->isHumongous() && !r->is_young()) { | |
| 2522 add_region(r); | |
| 2523 } | |
| 2524 } | |
| 2525 return false; | |
| 2526 } | |
| 2527 jint marked_regions_added() { return _marked_regions_added; } | |
| 2528 int invokes() { return _invokes; } | |
| 2529 }; | |
| 2530 | |
| 2531 class ParKnownGarbageTask: public AbstractGangTask { | |
| 2532 CollectionSetChooser* _hrSorted; | |
| 2533 jint _chunk_size; | |
| 2534 G1CollectedHeap* _g1; | |
| 2535 public: | |
| 2536 ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) : | |
| 2537 AbstractGangTask("ParKnownGarbageTask"), | |
| 2538 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
| 2539 _g1(G1CollectedHeap::heap()) | |
| 2540 {} | |
| 2541 | |
| 2542 void work(int i) { | |
| 2543 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size, i); | |
| 2544 // Back to zero for the claim value. | |
| 355 | 2545 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, i, |
| 2546 HeapRegion::InitialClaimValue); | |
| 342 | 2547 jint regions_added = parKnownGarbageCl.marked_regions_added(); |
| 2548 _hrSorted->incNumMarkedHeapRegions(regions_added); | |
| 2549 if (G1PrintParCleanupStats) { | |
|
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2550 gclog_or_tty->print_cr(" Thread %d called %d times, added %d regions to list.", |
| 342 | 2551 i, parKnownGarbageCl.invokes(), regions_added); |
| 2552 } | |
| 2553 } | |
| 2554 }; | |
| 2555 | |
| 2556 void | |
| 2557 G1CollectorPolicy_BestRegionsFirst:: | |
| 2558 record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
| 2559 size_t max_live_bytes) { | |
| 2560 double start; | |
| 2561 if (G1PrintParCleanupStats) start = os::elapsedTime(); | |
| 2562 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
| 2563 | |
| 2564 _collectionSetChooser->clearMarkedHeapRegions(); | |
| 2565 double clear_marked_end; | |
| 2566 if (G1PrintParCleanupStats) { | |
| 2567 clear_marked_end = os::elapsedTime(); | |
| 2568 gclog_or_tty->print_cr(" clear marked regions + work1: %8.3f ms.", | |
| 2569 (clear_marked_end - start)*1000.0); | |
| 2570 } | |
|
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2571 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 2572 const size_t OverpartitionFactor = 4; |
|
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2573 const size_t MinWorkUnit = 8; |
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2574 const size_t WorkUnit = |
| 342 | 2575 MAX2(_g1->n_regions() / (ParallelGCThreads * OverpartitionFactor), |
|
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2576 MinWorkUnit); |
| 342 | 2577 _collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(), |
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2578 WorkUnit); |
| 342 | 2579 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
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2580 (int) WorkUnit); |
| 342 | 2581 _g1->workers()->run_task(&parKnownGarbageTask); |
| 355 | 2582 |
| 2583 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 2584 "sanity check"); | |
| 342 | 2585 } else { |
| 2586 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
| 2587 _g1->heap_region_iterate(&knownGarbagecl); | |
| 2588 } | |
| 2589 double known_garbage_end; | |
| 2590 if (G1PrintParCleanupStats) { | |
| 2591 known_garbage_end = os::elapsedTime(); | |
| 2592 gclog_or_tty->print_cr(" compute known garbage: %8.3f ms.", | |
| 2593 (known_garbage_end - clear_marked_end)*1000.0); | |
| 2594 } | |
| 2595 _collectionSetChooser->sortMarkedHeapRegions(); | |
| 2596 double sort_end; | |
| 2597 if (G1PrintParCleanupStats) { | |
| 2598 sort_end = os::elapsedTime(); | |
| 2599 gclog_or_tty->print_cr(" sorting: %8.3f ms.", | |
| 2600 (sort_end - known_garbage_end)*1000.0); | |
| 2601 } | |
| 2602 | |
| 2603 record_concurrent_mark_cleanup_end_work2(); | |
| 2604 double work2_end; | |
| 2605 if (G1PrintParCleanupStats) { | |
| 2606 work2_end = os::elapsedTime(); | |
| 2607 gclog_or_tty->print_cr(" work2: %8.3f ms.", | |
| 2608 (work2_end - sort_end)*1000.0); | |
| 2609 } | |
| 2610 } | |
| 2611 | |
|
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2612 // Add the heap region at the head of the non-incremental collection set |
| 342 | 2613 void G1CollectorPolicy:: |
| 2614 add_to_collection_set(HeapRegion* hr) { | |
|
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2615 assert(_inc_cset_build_state == Active, "Precondition"); |
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2616 assert(!hr->is_young(), "non-incremental add of young region"); |
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2617 |
| 342 | 2618 if (_g1->mark_in_progress()) |
| 2619 _g1->concurrent_mark()->registerCSetRegion(hr); | |
| 2620 | |
|
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2621 assert(!hr->in_collection_set(), "should not already be in the CSet"); |
| 342 | 2622 hr->set_in_collection_set(true); |
| 2623 hr->set_next_in_collection_set(_collection_set); | |
| 2624 _collection_set = hr; | |
| 2625 _collection_set_size++; | |
| 2626 _collection_set_bytes_used_before += hr->used(); | |
| 526 | 2627 _g1->register_region_with_in_cset_fast_test(hr); |
| 342 | 2628 } |
| 2629 | |
|
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2630 // Initialize the per-collection-set information |
|
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2631 void G1CollectorPolicy::start_incremental_cset_building() { |
|
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2632 assert(_inc_cset_build_state == Inactive, "Precondition"); |
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2633 |
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2634 _inc_cset_head = NULL; |
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2635 _inc_cset_tail = NULL; |
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2636 _inc_cset_size = 0; |
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|
2637 _inc_cset_bytes_used_before = 0; |
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2638 |
|
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2639 _inc_cset_young_index = 0; |
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2640 |
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|
2641 _inc_cset_max_finger = 0; |
|
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|
2642 _inc_cset_recorded_young_bytes = 0; |
|
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|
2643 _inc_cset_recorded_rs_lengths = 0; |
|
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|
2644 _inc_cset_predicted_elapsed_time_ms = 0; |
|
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|
2645 _inc_cset_predicted_bytes_to_copy = 0; |
|
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|
2646 _inc_cset_build_state = Active; |
|
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diff
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|
2647 } |
|
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diff
changeset
|
2648 |
|
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diff
changeset
|
2649 void G1CollectorPolicy::add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length) { |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2650 // This routine is used when: |
|
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|
2651 // * adding survivor regions to the incremental cset at the end of an |
|
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|
2652 // evacuation pause, |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2653 // * adding the current allocation region to the incremental cset |
|
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|
2654 // when it is retired, and |
|
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|
2655 // * updating existing policy information for a region in the |
|
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changeset
|
2656 // incremental cset via young list RSet sampling. |
|
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changeset
|
2657 // Therefore this routine may be called at a safepoint by the |
|
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changeset
|
2658 // VM thread, or in-between safepoints by mutator threads (when |
|
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changeset
|
2659 // retiring the current allocation region) or a concurrent |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2660 // refine thread (RSet sampling). |
|
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diff
changeset
|
2661 |
|
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diff
changeset
|
2662 double region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, true); |
|
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|
2663 size_t used_bytes = hr->used(); |
|
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|
2664 |
|
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changeset
|
2665 _inc_cset_recorded_rs_lengths += rs_length; |
|
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|
2666 _inc_cset_predicted_elapsed_time_ms += region_elapsed_time_ms; |
|
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changeset
|
2667 |
|
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changeset
|
2668 _inc_cset_bytes_used_before += used_bytes; |
|
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changeset
|
2669 |
|
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changeset
|
2670 // Cache the values we have added to the aggregated informtion |
|
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|
2671 // in the heap region in case we have to remove this region from |
|
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changeset
|
2672 // the incremental collection set, or it is updated by the |
|
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changeset
|
2673 // rset sampling code |
|
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changeset
|
2674 hr->set_recorded_rs_length(rs_length); |
|
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changeset
|
2675 hr->set_predicted_elapsed_time_ms(region_elapsed_time_ms); |
|
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changeset
|
2676 |
|
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diff
changeset
|
2677 #if PREDICTIONS_VERBOSE |
|
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|
2678 size_t bytes_to_copy = predict_bytes_to_copy(hr); |
|
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parents:
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changeset
|
2679 _inc_cset_predicted_bytes_to_copy += bytes_to_copy; |
|
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parents:
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diff
changeset
|
2680 |
|
1316cec51b4d
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diff
changeset
|
2681 // Record the number of bytes used in this region |
|
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changeset
|
2682 _inc_cset_recorded_young_bytes += used_bytes; |
|
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parents:
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diff
changeset
|
2683 |
|
1316cec51b4d
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diff
changeset
|
2684 // Cache the values we have added to the aggregated informtion |
|
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diff
changeset
|
2685 // in the heap region in case we have to remove this region from |
|
1316cec51b4d
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parents:
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diff
changeset
|
2686 // the incremental collection set, or it is updated by the |
|
1316cec51b4d
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diff
changeset
|
2687 // rset sampling code |
|
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parents:
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diff
changeset
|
2688 hr->set_predicted_bytes_to_copy(bytes_to_copy); |
|
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parents:
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changeset
|
2689 #endif // PREDICTIONS_VERBOSE |
|
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diff
changeset
|
2690 } |
|
1316cec51b4d
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parents:
1391
diff
changeset
|
2691 |
|
1316cec51b4d
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parents:
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diff
changeset
|
2692 void G1CollectorPolicy::remove_from_incremental_cset_info(HeapRegion* hr) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2693 // This routine is currently only called as part of the updating of |
|
1316cec51b4d
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parents:
1391
diff
changeset
|
2694 // existing policy information for regions in the incremental cset that |
|
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
|
2695 // is performed by the concurrent refine thread(s) as part of young list |
|
1316cec51b4d
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parents:
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diff
changeset
|
2696 // RSet sampling. Therefore we should not be at a safepoint. |
|
1316cec51b4d
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parents:
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diff
changeset
|
2697 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2698 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:
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diff
changeset
|
2699 assert(hr->is_young(), "it should be"); |
|
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parents:
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diff
changeset
|
2700 |
|
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
|
2701 size_t used_bytes = hr->used(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2702 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:
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diff
changeset
|
2703 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:
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diff
changeset
|
2704 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2705 // Subtract the old recorded/predicted policy information for |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2706 // 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
|
2707 _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
|
2708 _inc_cset_predicted_elapsed_time_ms -= old_elapsed_time_ms; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2709 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2710 _inc_cset_bytes_used_before -= used_bytes; |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2711 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2712 // Clear the values cached in the heap region |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2713 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
|
2714 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
|
2715 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2716 #if PREDICTIONS_VERBOSE |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2717 size_t old_predicted_bytes_to_copy = hr->predicted_bytes_to_copy(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2718 _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
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parents:
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diff
changeset
|
2719 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2720 // 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
|
2721 _inc_cset_recorded_young_bytes -= used_bytes; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2722 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2723 // Clear the values cached in the heap region |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2724 hr->set_predicted_bytes_to_copy(0); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2725 #endif // PREDICTIONS_VERBOSE |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2726 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2727 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2728 void G1CollectorPolicy::update_incremental_cset_info(HeapRegion* hr, size_t new_rs_length) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2729 // Update the collection set information that is dependent on the new RS length |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2730 assert(hr->is_young(), "Precondition"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2731 |
|
1316cec51b4d
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1391
diff
changeset
|
2732 remove_from_incremental_cset_info(hr); |
|
1316cec51b4d
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parents:
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diff
changeset
|
2733 add_to_incremental_cset_info(hr, new_rs_length); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2734 } |
|
1316cec51b4d
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1391
diff
changeset
|
2735 |
|
1316cec51b4d
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1391
diff
changeset
|
2736 void G1CollectorPolicy::add_region_to_incremental_cset_common(HeapRegion* hr) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2737 assert( hr->is_young(), "invariant"); |
|
1316cec51b4d
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parents:
1391
diff
changeset
|
2738 assert( hr->young_index_in_cset() == -1, "invariant" ); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2739 assert(_inc_cset_build_state == Active, "Precondition"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2740 |
|
1316cec51b4d
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1391
diff
changeset
|
2741 // We need to clear and set the cached recorded/cached collection set |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2742 // information in the heap region here (before the region gets added |
|
1316cec51b4d
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diff
changeset
|
2743 // to the collection set). An individual heap region's cached values |
|
1316cec51b4d
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diff
changeset
|
2744 // are calculated, aggregated with the policy collection set info, |
|
1316cec51b4d
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diff
changeset
|
2745 // and cached in the heap region here (initially) and (subsequently) |
|
1316cec51b4d
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parents:
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diff
changeset
|
2746 // by the Young List sampling code. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2747 |
|
1316cec51b4d
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parents:
1391
diff
changeset
|
2748 size_t rs_length = hr->rem_set()->occupied(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2749 add_to_incremental_cset_info(hr, rs_length); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2750 |
|
1316cec51b4d
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parents:
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diff
changeset
|
2751 HeapWord* hr_end = hr->end(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2752 _inc_cset_max_finger = MAX2(_inc_cset_max_finger, hr_end); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2753 |
|
1316cec51b4d
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parents:
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changeset
|
2754 assert(!hr->in_collection_set(), "invariant"); |
|
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parents:
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changeset
|
2755 hr->set_in_collection_set(true); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2756 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:
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diff
changeset
|
2757 |
|
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
|
2758 _inc_cset_size++; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2759 _g1->register_region_with_in_cset_fast_test(hr); |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2760 |
|
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
|
2761 hr->set_young_index_in_cset((int) _inc_cset_young_index); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2762 ++_inc_cset_young_index; |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2763 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2764 |
|
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
|
2765 // Add the region at the RHS of the incremental cset |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2766 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
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parents:
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diff
changeset
|
2767 // 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
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parents:
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diff
changeset
|
2768 assert( hr->is_survivor(), "Logic"); |
|
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
|
2769 |
|
1316cec51b4d
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diff
changeset
|
2770 // Do the 'common' stuff |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2771 add_region_to_incremental_cset_common(hr); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2772 |
|
1316cec51b4d
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parents:
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diff
changeset
|
2773 // Now add the region at the right hand side |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2774 if (_inc_cset_tail == NULL) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2775 assert(_inc_cset_head == NULL, "invariant"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2776 _inc_cset_head = hr; |
|
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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
|
2777 } else { |
|
1316cec51b4d
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parents:
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diff
changeset
|
2778 _inc_cset_tail->set_next_in_collection_set(hr); |
|
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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
|
2779 } |
|
1316cec51b4d
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parents:
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diff
changeset
|
2780 _inc_cset_tail = hr; |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2781 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2782 |
|
1316cec51b4d
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parents:
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diff
changeset
|
2783 // Add the region to the LHS of the incremental cset |
|
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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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changeset
|
2784 void G1CollectorPolicy::add_region_to_incremental_cset_lhs(HeapRegion* hr) { |
|
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diff
changeset
|
2785 // Survivors should be added to the RHS at the end of a pause |
|
1316cec51b4d
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parents:
1391
diff
changeset
|
2786 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
|
2787 |
|
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
|
2788 // Do the 'common' stuff |
|
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
|
2789 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
|
2790 |
|
1316cec51b4d
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parents:
1391
diff
changeset
|
2791 // 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:
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diff
changeset
|
2792 hr->set_next_in_collection_set(_inc_cset_head); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2793 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
|
2794 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
|
2795 _inc_cset_tail = hr; |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2796 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2797 _inc_cset_head = hr; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2798 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2799 |
|
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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
|
2800 #ifndef PRODUCT |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2801 void G1CollectorPolicy::print_collection_set(HeapRegion* list_head, outputStream* st) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2802 assert(list_head == inc_cset_head() || list_head == collection_set(), "must be"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2803 |
|
1316cec51b4d
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diff
changeset
|
2804 st->print_cr("\nCollection_set:"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2805 HeapRegion* csr = list_head; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2806 while (csr != NULL) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2807 HeapRegion* next = csr->next_in_collection_set(); |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2808 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:
1391
diff
changeset
|
2809 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:
1391
diff
changeset
|
2810 "age: %4d, y: %d, surv: %d", |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2811 csr->bottom(), csr->end(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2812 csr->top(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2813 csr->prev_top_at_mark_start(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2814 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
|
2815 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
|
2816 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
|
2817 csr->is_young(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2818 csr->is_survivor()); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2819 csr = next; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2820 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2821 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2822 #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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diff
changeset
|
2823 |
| 1707 | 2824 void |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2825 G1CollectorPolicy_BestRegionsFirst::choose_collection_set( |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2826 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
|
2827 // Set this here - in case we're not doing young collections. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2828 double non_young_start_time_sec = os::elapsedTime(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2829 |
|
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2830 YoungList* young_list = _g1->young_list(); |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2831 |
| 342 | 2832 start_recording_regions(); |
| 2833 | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2834 guarantee(target_pause_time_ms > 0.0, |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2835 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
|
2836 target_pause_time_ms)); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2837 guarantee(_collection_set == NULL, "Precondition"); |
| 342 | 2838 |
| 2839 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
| 2840 double predicted_pause_time_ms = base_time_ms; | |
| 2841 | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2842 double time_remaining_ms = target_pause_time_ms - base_time_ms; |
| 342 | 2843 |
|
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
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3868
diff
changeset
|
2844 ergo_verbose3(ErgoCSetConstruction | ErgoHigh, |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2845 "start choosing CSet", |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2846 ergo_format_ms("predicted base time") |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2847 ergo_format_ms("remaining time") |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2848 ergo_format_ms("target pause time"), |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2849 base_time_ms, time_remaining_ms, target_pause_time_ms); |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
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3868
diff
changeset
|
2850 |
| 342 | 2851 // the 10% and 50% values are arbitrary... |
|
3914
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2852 double threshold = 0.10 * target_pause_time_ms; |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2853 if (time_remaining_ms < threshold) { |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2854 double prev_time_remaining_ms = time_remaining_ms; |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2855 time_remaining_ms = 0.50 * target_pause_time_ms; |
| 342 | 2856 _within_target = false; |
|
3914
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2857 ergo_verbose3(ErgoCSetConstruction, |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2858 "adjust remaining time", |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2859 ergo_format_reason("remaining time lower than threshold") |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2860 ergo_format_ms("remaining time") |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2861 ergo_format_ms("threshold") |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2862 ergo_format_ms("adjusted remaining time"), |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2863 prev_time_remaining_ms, threshold, time_remaining_ms); |
| 342 | 2864 } else { |
| 2865 _within_target = true; | |
| 2866 } | |
| 2867 | |
|
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2868 size_t expansion_bytes = _g1->expansion_regions() * HeapRegion::GrainBytes; |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2869 |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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parents:
3868
diff
changeset
|
2870 HeapRegion* hr; |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2871 double young_start_time_sec = os::elapsedTime(); |
| 342 | 2872 |
| 677 | 2873 _collection_set_bytes_used_before = 0; |
| 2874 _collection_set_size = 0; | |
|
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2875 _young_cset_length = 0; |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2876 _last_young_gc_full = full_young_gcs() ? true : false; |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2877 |
|
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2878 if (_last_young_gc_full) { |
|
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2879 ++_full_young_pause_num; |
|
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2880 } else { |
|
3867
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6814390: G1: remove the concept of non-generational G1
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3830
diff
changeset
|
2881 ++_partial_young_pause_num; |
|
3914
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2882 } |
|
3867
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6814390: G1: remove the concept of non-generational G1
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diff
changeset
|
2883 |
|
ff53346271fe
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diff
changeset
|
2884 // The young list is laid with the survivor regions from the previous |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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|
2885 // pause are appended to the RHS of the young list, i.e. |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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|
2886 // [Newly Young Regions ++ Survivors from last pause]. |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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3830
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changeset
|
2887 |
|
3914
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2888 size_t survivor_region_num = young_list->survivor_length(); |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2889 size_t eden_region_num = young_list->length() - survivor_region_num; |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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parents:
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changeset
|
2890 size_t old_region_num = 0; |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
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|
2891 hr = young_list->first_survivor_region(); |
|
3867
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6814390: G1: remove the concept of non-generational G1
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|
2892 while (hr != NULL) { |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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diff
changeset
|
2893 assert(hr->is_survivor(), "badly formed young list"); |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
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diff
changeset
|
2894 hr->set_young(); |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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diff
changeset
|
2895 hr = hr->get_next_young_region(); |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
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3830
diff
changeset
|
2896 } |
|
ff53346271fe
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diff
changeset
|
2897 |
|
3914
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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diff
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|
2898 // Clear the fields that point to the survivor list - they are all young now. |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2899 young_list->clear_survivors(); |
|
3867
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|
2900 |
|
ff53346271fe
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diff
changeset
|
2901 if (_g1->mark_in_progress()) |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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changeset
|
2902 _g1->concurrent_mark()->register_collection_set_finger(_inc_cset_max_finger); |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
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|
2903 |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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diff
changeset
|
2904 _young_cset_length = _inc_cset_young_index; |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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|
2905 _collection_set = _inc_cset_head; |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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|
2906 _collection_set_size = _inc_cset_size; |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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|
2907 _collection_set_bytes_used_before = _inc_cset_bytes_used_before; |
|
ff53346271fe
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|
2908 time_remaining_ms -= _inc_cset_predicted_elapsed_time_ms; |
|
ff53346271fe
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|
2909 predicted_pause_time_ms += _inc_cset_predicted_elapsed_time_ms; |
|
ff53346271fe
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|
2910 |
|
3914
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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diff
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|
2911 ergo_verbose3(ErgoCSetConstruction | ErgoHigh, |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2912 "add young regions to CSet", |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2913 ergo_format_region("eden") |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2914 ergo_format_region("survivors") |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2915 ergo_format_ms("predicted young region time"), |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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parents:
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|
2916 eden_region_num, survivor_region_num, |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2917 _inc_cset_predicted_elapsed_time_ms); |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2918 |
|
3867
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changeset
|
2919 // The number of recorded young regions is the incremental |
|
ff53346271fe
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diff
changeset
|
2920 // collection set's current size |
|
ff53346271fe
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changeset
|
2921 set_recorded_young_regions(_inc_cset_size); |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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|
2922 set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths); |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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|
2923 set_recorded_young_bytes(_inc_cset_recorded_young_bytes); |
|
1394
1316cec51b4d
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johnc
parents:
1391
diff
changeset
|
2924 #if PREDICTIONS_VERBOSE |
|
3867
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|
2925 set_predicted_bytes_to_copy(_inc_cset_predicted_bytes_to_copy); |
|
1394
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diff
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|
2926 #endif // PREDICTIONS_VERBOSE |
|
1316cec51b4d
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diff
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|
2927 |
|
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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parents:
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diff
changeset
|
2928 assert(_inc_cset_size == young_list->length(), "Invariant"); |
|
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
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changeset
|
2929 |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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diff
changeset
|
2930 double young_end_time_sec = os::elapsedTime(); |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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3830
diff
changeset
|
2931 _recorded_young_cset_choice_time_ms = |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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3830
diff
changeset
|
2932 (young_end_time_sec - young_start_time_sec) * 1000.0; |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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|
2933 |
|
ff53346271fe
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diff
changeset
|
2934 // We are doing young collections so reset this. |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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parents:
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diff
changeset
|
2935 non_young_start_time_sec = young_end_time_sec; |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2936 |
|
ff53346271fe
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brutisso
parents:
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diff
changeset
|
2937 if (!full_young_gcs()) { |
| 342 | 2938 bool should_continue = true; |
| 2939 NumberSeq seq; | |
| 2940 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
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diff
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|
2941 |
|
3914
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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diff
changeset
|
2942 size_t prev_collection_set_size = _collection_set_size; |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
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changeset
|
2943 double prev_predicted_pause_time_ms = predicted_pause_time_ms; |
| 342 | 2944 do { |
| 2945 hr = _collectionSetChooser->getNextMarkedRegion(time_remaining_ms, | |
| 2946 avg_prediction); | |
| 677 | 2947 if (hr != NULL) { |
| 342 | 2948 double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
| 2949 time_remaining_ms -= predicted_time_ms; | |
| 2950 predicted_pause_time_ms += predicted_time_ms; | |
| 2951 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
|
2952 record_non_young_cset_region(hr); |
| 342 | 2953 seq.add(predicted_time_ms); |
| 2954 avg_prediction = seq.avg() + seq.sd(); | |
| 2955 } | |
|
3914
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3868
diff
changeset
|
2956 |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2957 should_continue = true; |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2958 if (hr == NULL) { |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2959 // No need for an ergo verbose message here, |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2960 // getNextMarkRegion() does this when it returns NULL. |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2961 should_continue = false; |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
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3868
diff
changeset
|
2962 } else { |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2963 if (adaptive_young_list_length()) { |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2964 if (time_remaining_ms < 0.0) { |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2965 ergo_verbose1(ErgoCSetConstruction, |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2966 "stop adding old regions to CSet", |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2967 ergo_format_reason("remaining time is lower than 0") |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2968 ergo_format_ms("remaining time"), |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2969 time_remaining_ms); |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2970 should_continue = false; |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2971 } |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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parents:
3868
diff
changeset
|
2972 } else { |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2973 if (_collection_set_size < _young_list_fixed_length) { |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2974 ergo_verbose2(ErgoCSetConstruction, |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2975 "stop adding old regions to CSet", |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2976 ergo_format_reason("CSet length lower than target") |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2977 ergo_format_region("CSet") |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2978 ergo_format_region("young target"), |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2979 _collection_set_size, _young_list_fixed_length); |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2980 should_continue = false; |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2981 } |
|
20213c8a3c40
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tonyp
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3868
diff
changeset
|
2982 } |
|
20213c8a3c40
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3868
diff
changeset
|
2983 } |
| 342 | 2984 } while (should_continue); |
| 2985 | |
| 2986 if (!adaptive_young_list_length() && | |
|
3914
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
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3868
diff
changeset
|
2987 _collection_set_size < _young_list_fixed_length) { |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2988 ergo_verbose2(ErgoCSetConstruction, |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2989 "request partially-young GCs end", |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2990 ergo_format_reason("CSet length lower than target") |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2991 ergo_format_region("CSet") |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2992 ergo_format_region("young target"), |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2993 _collection_set_size, _young_list_fixed_length); |
| 342 | 2994 _should_revert_to_full_young_gcs = true; |
|
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2995 } |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
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3868
diff
changeset
|
2996 |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2997 old_region_num = _collection_set_size - prev_collection_set_size; |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
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3868
diff
changeset
|
2998 |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2999 ergo_verbose2(ErgoCSetConstruction | ErgoHigh, |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
3000 "add old regions to CSet", |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
3001 ergo_format_region("old") |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
3002 ergo_format_ms("predicted old region time"), |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
3003 old_region_num, |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
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3868
diff
changeset
|
3004 predicted_pause_time_ms - prev_predicted_pause_time_ms); |
| 342 | 3005 } |
| 3006 | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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1391
diff
changeset
|
3007 stop_incremental_cset_building(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3008 |
| 342 | 3009 count_CS_bytes_used(); |
| 3010 | |
| 3011 end_recording_regions(); | |
| 3012 | |
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3013 ergo_verbose5(ErgoCSetConstruction, |
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3014 "finish choosing CSet", |
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3015 ergo_format_region("eden") |
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3016 ergo_format_region("survivors") |
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3017 ergo_format_region("old") |
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3018 ergo_format_ms("predicted pause time") |
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3019 ergo_format_ms("target pause time"), |
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3020 eden_region_num, survivor_region_num, old_region_num, |
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3021 predicted_pause_time_ms, target_pause_time_ms); |
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3022 |
| 342 | 3023 double non_young_end_time_sec = os::elapsedTime(); |
| 3024 _recorded_non_young_cset_choice_time_ms = | |
| 3025 (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; | |
| 3026 } | |
| 3027 | |
| 3028 void G1CollectorPolicy_BestRegionsFirst::record_full_collection_end() { | |
| 3029 G1CollectorPolicy::record_full_collection_end(); | |
| 3030 _collectionSetChooser->updateAfterFullCollection(); | |
| 3031 } | |
| 3032 | |
| 3033 void G1CollectorPolicy_BestRegionsFirst:: | |
| 1707 | 3034 record_collection_pause_end() { |
| 3035 G1CollectorPolicy::record_collection_pause_end(); | |
| 342 | 3036 assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end."); |
| 3037 } |