Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 3778:5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
Summary: Extend and make more consistent the output from the G1PrintHeapRegions flag.
Reviewed-by: johnc, jmasa
| author | tonyp |
|---|---|
| date | Fri, 24 Jun 2011 12:38:49 -0400 |
| parents | c3f1170908be |
| children | 14a2fd14c0db |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 2152 | 2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
| 27 #include "gc_implementation/g1/concurrentMark.hpp" | |
| 28 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
| 29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
| 30 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
| 31 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
| 32 #include "gc_implementation/shared/gcPolicyCounters.hpp" | |
| 33 #include "runtime/arguments.hpp" | |
| 34 #include "runtime/java.hpp" | |
| 35 #include "runtime/mutexLocker.hpp" | |
| 36 #include "utilities/debug.hpp" | |
| 342 | 37 |
| 38 #define PREDICTIONS_VERBOSE 0 | |
| 39 | |
| 40 // <NEW PREDICTION> | |
| 41 | |
| 42 // Different defaults for different number of GC threads | |
| 43 // They were chosen by running GCOld and SPECjbb on debris with different | |
| 44 // numbers of GC threads and choosing them based on the results | |
| 45 | |
| 46 // all the same | |
| 47 static double rs_length_diff_defaults[] = { | |
| 48 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 | |
| 49 }; | |
| 50 | |
| 51 static double cost_per_card_ms_defaults[] = { | |
| 52 0.01, 0.005, 0.005, 0.003, 0.003, 0.002, 0.002, 0.0015 | |
| 53 }; | |
| 54 | |
| 55 // all the same | |
| 56 static double fully_young_cards_per_entry_ratio_defaults[] = { | |
| 57 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 | |
| 58 }; | |
| 59 | |
| 60 static double cost_per_entry_ms_defaults[] = { | |
| 61 0.015, 0.01, 0.01, 0.008, 0.008, 0.0055, 0.0055, 0.005 | |
| 62 }; | |
| 63 | |
| 64 static double cost_per_byte_ms_defaults[] = { | |
| 65 0.00006, 0.00003, 0.00003, 0.000015, 0.000015, 0.00001, 0.00001, 0.000009 | |
| 66 }; | |
| 67 | |
| 68 // these should be pretty consistent | |
| 69 static double constant_other_time_ms_defaults[] = { | |
| 70 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0 | |
| 71 }; | |
| 72 | |
| 73 | |
| 74 static double young_other_cost_per_region_ms_defaults[] = { | |
| 75 0.3, 0.2, 0.2, 0.15, 0.15, 0.12, 0.12, 0.1 | |
| 76 }; | |
| 77 | |
| 78 static double non_young_other_cost_per_region_ms_defaults[] = { | |
| 79 1.0, 0.7, 0.7, 0.5, 0.5, 0.42, 0.42, 0.30 | |
| 80 }; | |
| 81 | |
| 82 // </NEW PREDICTION> | |
| 83 | |
|
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84 // Help class for avoiding interleaved logging |
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85 class LineBuffer: public StackObj { |
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86 |
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87 private: |
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88 static const int BUFFER_LEN = 1024; |
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89 static const int INDENT_CHARS = 3; |
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90 char _buffer[BUFFER_LEN]; |
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91 int _indent_level; |
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92 int _cur; |
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93 |
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94 void vappend(const char* format, va_list ap) { |
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95 int res = vsnprintf(&_buffer[_cur], BUFFER_LEN - _cur, format, ap); |
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96 if (res != -1) { |
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97 _cur += res; |
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98 } else { |
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99 DEBUG_ONLY(warning("buffer too small in LineBuffer");) |
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100 _buffer[BUFFER_LEN -1] = 0; |
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101 _cur = BUFFER_LEN; // vsnprintf above should not add to _buffer if we are called again |
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102 } |
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103 } |
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104 |
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105 public: |
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106 explicit LineBuffer(int indent_level): _indent_level(indent_level), _cur(0) { |
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107 for (; (_cur < BUFFER_LEN && _cur < (_indent_level * INDENT_CHARS)); _cur++) { |
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108 _buffer[_cur] = ' '; |
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109 } |
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110 } |
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111 |
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112 #ifndef PRODUCT |
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113 ~LineBuffer() { |
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114 assert(_cur == _indent_level * INDENT_CHARS, "pending data in buffer - append_and_print_cr() not called?"); |
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115 } |
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116 #endif |
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117 |
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118 void append(const char* format, ...) { |
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119 va_list ap; |
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120 va_start(ap, format); |
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121 vappend(format, ap); |
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122 va_end(ap); |
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123 } |
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124 |
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125 void append_and_print_cr(const char* format, ...) { |
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126 va_list ap; |
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127 va_start(ap, format); |
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128 vappend(format, ap); |
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129 va_end(ap); |
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130 gclog_or_tty->print_cr("%s", _buffer); |
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131 _cur = _indent_level * INDENT_CHARS; |
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132 } |
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133 }; |
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134 |
| 342 | 135 G1CollectorPolicy::G1CollectorPolicy() : |
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136 _parallel_gc_threads(G1CollectedHeap::use_parallel_gc_threads() |
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137 ? ParallelGCThreads : 1), |
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138 |
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139 |
| 342 | 140 _n_pauses(0), |
| 141 _recent_CH_strong_roots_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 142 _recent_G1_strong_roots_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 143 _recent_evac_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 144 _recent_pause_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 145 _recent_rs_sizes(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 146 _recent_gc_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 147 _all_pause_times_ms(new NumberSeq()), | |
| 148 _stop_world_start(0.0), | |
| 149 _all_stop_world_times_ms(new NumberSeq()), | |
| 150 _all_yield_times_ms(new NumberSeq()), | |
| 151 | |
| 152 _all_mod_union_times_ms(new NumberSeq()), | |
| 153 | |
| 677 | 154 _summary(new Summary()), |
| 342 | 155 |
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156 #ifndef PRODUCT |
| 342 | 157 _cur_clear_ct_time_ms(0.0), |
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158 _min_clear_cc_time_ms(-1.0), |
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159 _max_clear_cc_time_ms(-1.0), |
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160 _cur_clear_cc_time_ms(0.0), |
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161 _cum_clear_cc_time_ms(0.0), |
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162 _num_cc_clears(0L), |
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163 #endif |
| 342 | 164 |
| 165 _region_num_young(0), | |
| 166 _region_num_tenured(0), | |
| 167 _prev_region_num_young(0), | |
| 168 _prev_region_num_tenured(0), | |
| 169 | |
| 170 _aux_num(10), | |
| 171 _all_aux_times_ms(new NumberSeq[_aux_num]), | |
| 172 _cur_aux_start_times_ms(new double[_aux_num]), | |
| 173 _cur_aux_times_ms(new double[_aux_num]), | |
| 174 _cur_aux_times_set(new bool[_aux_num]), | |
| 175 | |
| 176 _concurrent_mark_init_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 177 _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 178 _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 179 | |
| 180 // <NEW PREDICTION> | |
| 181 | |
| 182 _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 183 _prev_collection_pause_end_ms(0.0), | |
| 184 _pending_card_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 185 _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 186 _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 187 _fully_young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 188 _partially_young_cards_per_entry_ratio_seq( | |
| 189 new TruncatedSeq(TruncatedSeqLength)), | |
| 190 _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 191 _partially_young_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 192 _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 193 _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 194 _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 195 _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 196 _non_young_other_cost_per_region_ms_seq( | |
| 197 new TruncatedSeq(TruncatedSeqLength)), | |
| 198 | |
| 199 _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 200 _scanned_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 201 _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 202 | |
| 751 | 203 _pause_time_target_ms((double) MaxGCPauseMillis), |
| 342 | 204 |
| 205 // </NEW PREDICTION> | |
| 206 | |
| 207 _in_young_gc_mode(false), | |
| 208 _full_young_gcs(true), | |
| 209 _full_young_pause_num(0), | |
| 210 _partial_young_pause_num(0), | |
| 211 | |
| 212 _during_marking(false), | |
| 213 _in_marking_window(false), | |
| 214 _in_marking_window_im(false), | |
| 215 | |
| 216 _known_garbage_ratio(0.0), | |
| 217 _known_garbage_bytes(0), | |
| 218 | |
| 219 _young_gc_eff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 220 | |
| 221 _recent_prev_end_times_for_all_gcs_sec(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 222 | |
| 223 _recent_CS_bytes_used_before(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 224 _recent_CS_bytes_surviving(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 225 | |
| 226 _recent_avg_pause_time_ratio(0.0), | |
| 227 _num_markings(0), | |
| 228 _n_marks(0), | |
| 229 _n_pauses_at_mark_end(0), | |
| 230 | |
| 231 _all_full_gc_times_ms(new NumberSeq()), | |
| 232 | |
| 233 // G1PausesBtwnConcMark defaults to -1 | |
| 234 // so the hack is to do the cast QQQ FIXME | |
| 235 _pauses_btwn_concurrent_mark((size_t)G1PausesBtwnConcMark), | |
| 236 _n_marks_since_last_pause(0), | |
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237 _initiate_conc_mark_if_possible(false), |
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238 _during_initial_mark_pause(false), |
| 342 | 239 _should_revert_to_full_young_gcs(false), |
| 240 _last_full_young_gc(false), | |
| 241 | |
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242 _eden_bytes_before_gc(0), |
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243 _survivor_bytes_before_gc(0), |
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244 _capacity_before_gc(0), |
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245 |
| 342 | 246 _prev_collection_pause_used_at_end_bytes(0), |
| 247 | |
| 248 _collection_set(NULL), | |
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249 _collection_set_size(0), |
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250 _collection_set_bytes_used_before(0), |
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251 |
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252 // Incremental CSet attributes |
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253 _inc_cset_build_state(Inactive), |
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254 _inc_cset_head(NULL), |
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255 _inc_cset_tail(NULL), |
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256 _inc_cset_size(0), |
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257 _inc_cset_young_index(0), |
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258 _inc_cset_bytes_used_before(0), |
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259 _inc_cset_max_finger(NULL), |
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260 _inc_cset_recorded_young_bytes(0), |
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261 _inc_cset_recorded_rs_lengths(0), |
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262 _inc_cset_predicted_elapsed_time_ms(0.0), |
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263 _inc_cset_predicted_bytes_to_copy(0), |
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264 |
| 342 | 265 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
| 266 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 267 #endif // _MSC_VER | |
| 268 | |
| 269 _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", | |
| 270 G1YoungSurvRateNumRegionsSummary)), | |
| 271 _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", | |
| 545 | 272 G1YoungSurvRateNumRegionsSummary)), |
| 342 | 273 // add here any more surv rate groups |
| 545 | 274 _recorded_survivor_regions(0), |
| 275 _recorded_survivor_head(NULL), | |
| 276 _recorded_survivor_tail(NULL), | |
| 1356 | 277 _survivors_age_table(true), |
| 278 | |
| 279 _gc_overhead_perc(0.0) | |
| 545 | 280 |
| 342 | 281 { |
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282 // Set up the region size and associated fields. Given that the |
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283 // policy is created before the heap, we have to set this up here, |
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284 // so it's done as soon as possible. |
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285 HeapRegion::setup_heap_region_size(Arguments::min_heap_size()); |
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286 HeapRegionRemSet::setup_remset_size(); |
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287 |
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288 // Verify PLAB sizes |
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289 const uint region_size = HeapRegion::GrainWords; |
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290 if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
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291 char buffer[128]; |
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292 jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most %u", |
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293 OldPLABSize > region_size ? "Old" : "Young", region_size); |
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294 vm_exit_during_initialization(buffer); |
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295 } |
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296 |
| 342 | 297 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
| 298 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
| 299 | |
| 1611 | 300 _par_last_gc_worker_start_times_ms = new double[_parallel_gc_threads]; |
| 342 | 301 _par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads]; |
| 302 _par_last_mark_stack_scan_times_ms = new double[_parallel_gc_threads]; | |
| 303 | |
| 304 _par_last_update_rs_times_ms = new double[_parallel_gc_threads]; | |
| 305 _par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; | |
| 306 | |
| 307 _par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; | |
| 308 | |
| 309 _par_last_obj_copy_times_ms = new double[_parallel_gc_threads]; | |
| 310 | |
| 311 _par_last_termination_times_ms = new double[_parallel_gc_threads]; | |
| 1611 | 312 _par_last_termination_attempts = new double[_parallel_gc_threads]; |
| 313 _par_last_gc_worker_end_times_ms = new double[_parallel_gc_threads]; | |
| 2430 | 314 _par_last_gc_worker_times_ms = new double[_parallel_gc_threads]; |
| 342 | 315 |
| 316 // start conservatively | |
| 751 | 317 _expensive_region_limit_ms = 0.5 * (double) MaxGCPauseMillis; |
| 342 | 318 |
| 319 // <NEW PREDICTION> | |
| 320 | |
| 321 int index; | |
| 322 if (ParallelGCThreads == 0) | |
| 323 index = 0; | |
| 324 else if (ParallelGCThreads > 8) | |
| 325 index = 7; | |
| 326 else | |
| 327 index = ParallelGCThreads - 1; | |
| 328 | |
| 329 _pending_card_diff_seq->add(0.0); | |
| 330 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
| 331 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
| 332 _fully_young_cards_per_entry_ratio_seq->add( | |
| 333 fully_young_cards_per_entry_ratio_defaults[index]); | |
| 334 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); | |
| 335 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
| 336 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
| 337 _young_other_cost_per_region_ms_seq->add( | |
| 338 young_other_cost_per_region_ms_defaults[index]); | |
| 339 _non_young_other_cost_per_region_ms_seq->add( | |
| 340 non_young_other_cost_per_region_ms_defaults[index]); | |
| 341 | |
| 342 // </NEW PREDICTION> | |
| 343 | |
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344 // Below, we might need to calculate the pause time target based on |
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345 // the pause interval. When we do so we are going to give G1 maximum |
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346 // flexibility and allow it to do pauses when it needs to. So, we'll |
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347 // arrange that the pause interval to be pause time target + 1 to |
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348 // ensure that a) the pause time target is maximized with respect to |
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349 // the pause interval and b) we maintain the invariant that pause |
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350 // time target < pause interval. If the user does not want this |
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351 // maximum flexibility, they will have to set the pause interval |
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352 // explicitly. |
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353 |
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354 // First make sure that, if either parameter is set, its value is |
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355 // reasonable. |
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356 if (!FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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357 if (MaxGCPauseMillis < 1) { |
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358 vm_exit_during_initialization("MaxGCPauseMillis should be " |
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359 "greater than 0"); |
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360 } |
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361 } |
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362 if (!FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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363 if (GCPauseIntervalMillis < 1) { |
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364 vm_exit_during_initialization("GCPauseIntervalMillis should be " |
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365 "greater than 0"); |
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366 } |
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367 } |
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368 |
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369 // Then, if the pause time target parameter was not set, set it to |
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370 // the default value. |
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371 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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372 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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373 // The default pause time target in G1 is 200ms |
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374 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); |
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375 } else { |
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376 // We do not allow the pause interval to be set without the |
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377 // pause time target |
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378 vm_exit_during_initialization("GCPauseIntervalMillis cannot be set " |
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379 "without setting MaxGCPauseMillis"); |
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380 } |
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381 } |
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382 |
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383 // Then, if the interval parameter was not set, set it according to |
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384 // the pause time target (this will also deal with the case when the |
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385 // pause time target is the default value). |
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386 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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387 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); |
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388 } |
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389 |
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390 // Finally, make sure that the two parameters are consistent. |
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391 if (MaxGCPauseMillis >= GCPauseIntervalMillis) { |
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392 char buffer[256]; |
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393 jio_snprintf(buffer, 256, |
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394 "MaxGCPauseMillis (%u) should be less than " |
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395 "GCPauseIntervalMillis (%u)", |
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396 MaxGCPauseMillis, GCPauseIntervalMillis); |
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397 vm_exit_during_initialization(buffer); |
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398 } |
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399 |
| 751 | 400 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; |
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401 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
| 342 | 402 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); |
| 751 | 403 _sigma = (double) G1ConfidencePercent / 100.0; |
| 342 | 404 |
| 405 // start conservatively (around 50ms is about right) | |
| 406 _concurrent_mark_init_times_ms->add(0.05); | |
| 407 _concurrent_mark_remark_times_ms->add(0.05); | |
| 408 _concurrent_mark_cleanup_times_ms->add(0.20); | |
| 409 _tenuring_threshold = MaxTenuringThreshold; | |
| 410 | |
| 1282 | 411 // if G1FixedSurvivorSpaceSize is 0 which means the size is not |
| 412 // fixed, then _max_survivor_regions will be calculated at | |
|
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413 // calculate_young_list_target_length during initialization |
| 1282 | 414 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
| 545 | 415 |
| 1356 | 416 assert(GCTimeRatio > 0, |
| 417 "we should have set it to a default value set_g1_gc_flags() " | |
| 418 "if a user set it to 0"); | |
| 419 _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); | |
| 420 | |
| 342 | 421 initialize_all(); |
| 422 } | |
| 423 | |
| 424 // Increment "i", mod "len" | |
| 425 static void inc_mod(int& i, int len) { | |
| 426 i++; if (i == len) i = 0; | |
| 427 } | |
| 428 | |
| 429 void G1CollectorPolicy::initialize_flags() { | |
| 430 set_min_alignment(HeapRegion::GrainBytes); | |
| 431 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
|
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432 if (SurvivorRatio < 1) { |
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433 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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434 } |
| 342 | 435 CollectorPolicy::initialize_flags(); |
| 436 } | |
| 437 | |
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438 // The easiest way to deal with the parsing of the NewSize / |
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439 // MaxNewSize / etc. parameteres is to re-use the code in the |
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440 // TwoGenerationCollectorPolicy class. This is similar to what |
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441 // ParallelScavenge does with its GenerationSizer class (see |
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442 // ParallelScavengeHeap::initialize()). We might change this in the |
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443 // future, but it's a good start. |
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444 class G1YoungGenSizer : public TwoGenerationCollectorPolicy { |
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445 size_t size_to_region_num(size_t byte_size) { |
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446 return MAX2((size_t) 1, byte_size / HeapRegion::GrainBytes); |
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447 } |
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448 |
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449 public: |
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450 G1YoungGenSizer() { |
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451 initialize_flags(); |
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452 initialize_size_info(); |
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453 } |
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454 |
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455 size_t min_young_region_num() { |
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456 return size_to_region_num(_min_gen0_size); |
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457 } |
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458 size_t initial_young_region_num() { |
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459 return size_to_region_num(_initial_gen0_size); |
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460 } |
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461 size_t max_young_region_num() { |
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462 return size_to_region_num(_max_gen0_size); |
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463 } |
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464 }; |
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465 |
| 342 | 466 void G1CollectorPolicy::init() { |
| 467 // Set aside an initial future to_space. | |
| 468 _g1 = G1CollectedHeap::heap(); | |
| 469 | |
| 470 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
| 471 | |
| 545 | 472 initialize_gc_policy_counters(); |
| 473 | |
| 342 | 474 if (G1Gen) { |
| 475 _in_young_gc_mode = true; | |
| 476 | |
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477 G1YoungGenSizer sizer; |
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478 size_t initial_region_num = sizer.initial_young_region_num(); |
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479 |
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480 if (UseAdaptiveSizePolicy) { |
| 342 | 481 set_adaptive_young_list_length(true); |
| 482 _young_list_fixed_length = 0; | |
| 483 } else { | |
| 484 set_adaptive_young_list_length(false); | |
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485 _young_list_fixed_length = initial_region_num; |
| 342 | 486 } |
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487 _free_regions_at_end_of_collection = _g1->free_regions(); |
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488 calculate_young_list_min_length(); |
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489 guarantee( _young_list_min_length == 0, "invariant, not enough info" ); |
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490 calculate_young_list_target_length(); |
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491 } else { |
| 342 | 492 _young_list_fixed_length = 0; |
| 493 _in_young_gc_mode = false; | |
| 494 } | |
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495 |
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496 // We may immediately start allocating regions and placing them on the |
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497 // collection set list. Initialize the per-collection set info |
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498 start_incremental_cset_building(); |
| 342 | 499 } |
| 500 | |
| 545 | 501 // Create the jstat counters for the policy. |
| 502 void G1CollectorPolicy::initialize_gc_policy_counters() | |
| 503 { | |
| 504 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 2 + G1Gen); | |
| 505 } | |
| 506 | |
| 342 | 507 void G1CollectorPolicy::calculate_young_list_min_length() { |
| 508 _young_list_min_length = 0; | |
| 509 | |
| 510 if (!adaptive_young_list_length()) | |
| 511 return; | |
| 512 | |
| 513 if (_alloc_rate_ms_seq->num() > 3) { | |
| 514 double now_sec = os::elapsedTime(); | |
| 515 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; | |
| 516 double alloc_rate_ms = predict_alloc_rate_ms(); | |
| 1973 | 517 size_t min_regions = (size_t) ceil(alloc_rate_ms * when_ms); |
| 518 size_t current_region_num = _g1->young_list()->length(); | |
| 342 | 519 _young_list_min_length = min_regions + current_region_num; |
| 520 } | |
| 521 } | |
| 522 | |
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523 void G1CollectorPolicy::calculate_young_list_target_length() { |
| 342 | 524 if (adaptive_young_list_length()) { |
| 525 size_t rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); | |
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526 calculate_young_list_target_length(rs_lengths); |
| 342 | 527 } else { |
| 528 if (full_young_gcs()) | |
| 529 _young_list_target_length = _young_list_fixed_length; | |
| 530 else | |
| 531 _young_list_target_length = _young_list_fixed_length / 2; | |
| 532 } | |
| 1973 | 533 |
| 534 // Make sure we allow the application to allocate at least one | |
| 535 // region before we need to do a collection again. | |
| 536 size_t min_length = _g1->young_list()->length() + 1; | |
| 537 _young_list_target_length = MAX2(_young_list_target_length, min_length); | |
|
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538 calculate_max_gc_locker_expansion(); |
| 545 | 539 calculate_survivors_policy(); |
| 342 | 540 } |
| 541 | |
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542 void G1CollectorPolicy::calculate_young_list_target_length(size_t rs_lengths) { |
| 342 | 543 guarantee( adaptive_young_list_length(), "pre-condition" ); |
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544 guarantee( !_in_marking_window || !_last_full_young_gc, "invariant" ); |
| 342 | 545 |
| 546 double start_time_sec = os::elapsedTime(); | |
| 1282 | 547 size_t min_reserve_perc = MAX2((size_t)2, (size_t)G1ReservePercent); |
| 342 | 548 min_reserve_perc = MIN2((size_t) 50, min_reserve_perc); |
| 549 size_t reserve_regions = | |
| 550 (size_t) ((double) min_reserve_perc * (double) _g1->n_regions() / 100.0); | |
| 551 | |
| 552 if (full_young_gcs() && _free_regions_at_end_of_collection > 0) { | |
| 553 // we are in fully-young mode and there are free regions in the heap | |
| 554 | |
| 545 | 555 double survivor_regions_evac_time = |
| 556 predict_survivor_regions_evac_time(); | |
| 557 | |
| 342 | 558 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
| 559 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); | |
| 560 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); | |
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561 size_t scanned_cards = predict_young_card_num(adj_rs_lengths); |
| 545 | 562 double base_time_ms = predict_base_elapsed_time_ms(pending_cards, scanned_cards) |
| 563 + survivor_regions_evac_time; | |
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564 |
| 342 | 565 // the result |
| 566 size_t final_young_length = 0; | |
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567 |
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568 size_t init_free_regions = |
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569 MAX2((size_t)0, _free_regions_at_end_of_collection - reserve_regions); |
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570 |
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571 // if we're still under the pause target... |
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572 if (base_time_ms <= target_pause_time_ms) { |
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573 // We make sure that the shortest young length that makes sense |
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574 // fits within the target pause time. |
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575 size_t min_young_length = 1; |
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576 |
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577 if (predict_will_fit(min_young_length, base_time_ms, |
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578 init_free_regions, target_pause_time_ms)) { |
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579 // The shortest young length will fit within the target pause time; |
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580 // we'll now check whether the absolute maximum number of young |
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581 // regions will fit in the target pause time. If not, we'll do |
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582 // a binary search between min_young_length and max_young_length |
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583 size_t abs_max_young_length = _free_regions_at_end_of_collection - 1; |
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584 size_t max_young_length = abs_max_young_length; |
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585 |
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586 if (max_young_length > min_young_length) { |
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587 // Let's check if the initial max young length will fit within the |
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588 // target pause. If so then there is no need to search for a maximal |
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589 // young length - we'll return the initial maximum |
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590 |
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591 if (predict_will_fit(max_young_length, base_time_ms, |
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592 init_free_regions, target_pause_time_ms)) { |
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593 // The maximum young length will satisfy the target pause time. |
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594 // We are done so set min young length to this maximum length. |
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595 // The code after the loop will then set final_young_length using |
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596 // the value cached in the minimum length. |
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597 min_young_length = max_young_length; |
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598 } else { |
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599 // The maximum possible number of young regions will not fit within |
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600 // the target pause time so let's search.... |
| 342 | 601 |
| 602 size_t diff = (max_young_length - min_young_length) / 2; | |
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603 max_young_length = min_young_length + diff; |
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604 |
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605 while (max_young_length > min_young_length) { |
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606 if (predict_will_fit(max_young_length, base_time_ms, |
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607 init_free_regions, target_pause_time_ms)) { |
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608 |
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609 // The current max young length will fit within the target |
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610 // pause time. Note we do not exit the loop here. By setting |
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611 // min = max, and then increasing the max below means that |
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612 // we will continue searching for an upper bound in the |
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613 // range [max..max+diff] |
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614 min_young_length = max_young_length; |
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615 } |
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616 diff = (max_young_length - min_young_length) / 2; |
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617 max_young_length = min_young_length + diff; |
| 342 | 618 } |
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619 // the above loop found a maximal young length that will fit |
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620 // within the target pause time. |
| 342 | 621 } |
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622 assert(min_young_length <= abs_max_young_length, "just checking"); |
| 342 | 623 } |
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624 final_young_length = min_young_length; |
| 342 | 625 } |
| 626 } | |
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627 // and we're done! |
| 342 | 628 |
| 629 // we should have at least one region in the target young length | |
| 545 | 630 _young_list_target_length = |
| 1973 | 631 final_young_length + _recorded_survivor_regions; |
| 342 | 632 |
| 633 // let's keep an eye of how long we spend on this calculation | |
| 634 // right now, I assume that we'll print it when we need it; we | |
| 635 // should really adde it to the breakdown of a pause | |
| 636 double end_time_sec = os::elapsedTime(); | |
| 637 double elapsed_time_ms = (end_time_sec - start_time_sec) * 1000.0; | |
| 638 | |
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639 #ifdef TRACE_CALC_YOUNG_LENGTH |
| 342 | 640 // leave this in for debugging, just in case |
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641 gclog_or_tty->print_cr("target = %1.1lf ms, young = " SIZE_FORMAT ", " |
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642 "elapsed %1.2lf ms, (%s%s) " SIZE_FORMAT SIZE_FORMAT, |
| 342 | 643 target_pause_time_ms, |
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644 _young_list_target_length |
| 342 | 645 elapsed_time_ms, |
| 646 full_young_gcs() ? "full" : "partial", | |
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647 during_initial_mark_pause() ? " i-m" : "", |
| 545 | 648 _in_marking_window, |
| 649 _in_marking_window_im); | |
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650 #endif // TRACE_CALC_YOUNG_LENGTH |
| 342 | 651 |
| 652 if (_young_list_target_length < _young_list_min_length) { | |
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653 // bummer; this means that, if we do a pause when the maximal |
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654 // length dictates, we'll violate the pause spacing target (the |
| 342 | 655 // min length was calculate based on the application's current |
| 656 // alloc rate); | |
| 657 | |
| 658 // so, we have to bite the bullet, and allocate the minimum | |
| 659 // number. We'll violate our target, but we just can't meet it. | |
| 660 | |
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661 #ifdef TRACE_CALC_YOUNG_LENGTH |
| 342 | 662 // leave this in for debugging, just in case |
| 663 gclog_or_tty->print_cr("adjusted target length from " | |
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664 SIZE_FORMAT " to " SIZE_FORMAT, |
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665 _young_list_target_length, _young_list_min_length); |
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666 #endif // TRACE_CALC_YOUNG_LENGTH |
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667 |
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668 _young_list_target_length = _young_list_min_length; |
| 342 | 669 } |
| 670 } else { | |
| 671 // we are in a partially-young mode or we've run out of regions (due | |
| 672 // to evacuation failure) | |
| 673 | |
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674 #ifdef TRACE_CALC_YOUNG_LENGTH |
| 342 | 675 // leave this in for debugging, just in case |
| 676 gclog_or_tty->print_cr("(partial) setting target to " SIZE_FORMAT | |
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677 _young_list_min_length); |
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678 #endif // TRACE_CALC_YOUNG_LENGTH |
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679 // we'll do the pause as soon as possible by choosing the minimum |
| 1973 | 680 _young_list_target_length = _young_list_min_length; |
| 342 | 681 } |
| 682 | |
| 683 _rs_lengths_prediction = rs_lengths; | |
| 684 } | |
| 685 | |
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686 // This is used by: calculate_young_list_target_length(rs_length). It |
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687 // returns true iff: |
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688 // the predicted pause time for the given young list will not overflow |
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689 // the target pause time |
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690 // and: |
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691 // the predicted amount of surviving data will not overflow the |
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692 // the amount of free space available for survivor regions. |
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693 // |
| 342 | 694 bool |
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695 G1CollectorPolicy::predict_will_fit(size_t young_length, |
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696 double base_time_ms, |
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697 size_t init_free_regions, |
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698 double target_pause_time_ms) { |
| 342 | 699 |
| 700 if (young_length >= init_free_regions) | |
| 701 // end condition 1: not enough space for the young regions | |
| 702 return false; | |
| 703 | |
| 704 double accum_surv_rate_adj = 0.0; | |
| 705 double accum_surv_rate = | |
| 706 accum_yg_surv_rate_pred((int)(young_length - 1)) - accum_surv_rate_adj; | |
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707 |
| 342 | 708 size_t bytes_to_copy = |
| 709 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); | |
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710 |
| 342 | 711 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
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712 |
| 342 | 713 double young_other_time_ms = |
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714 predict_young_other_time_ms(young_length); |
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715 |
| 342 | 716 double pause_time_ms = |
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717 base_time_ms + copy_time_ms + young_other_time_ms; |
| 342 | 718 |
| 719 if (pause_time_ms > target_pause_time_ms) | |
| 720 // end condition 2: over the target pause time | |
| 721 return false; | |
| 722 | |
| 723 size_t free_bytes = | |
| 724 (init_free_regions - young_length) * HeapRegion::GrainBytes; | |
| 725 | |
| 726 if ((2.0 + sigma()) * (double) bytes_to_copy > (double) free_bytes) | |
| 727 // end condition 3: out of to-space (conservatively) | |
| 728 return false; | |
| 729 | |
| 730 // success! | |
| 731 return true; | |
| 732 } | |
| 733 | |
| 545 | 734 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
| 735 double survivor_regions_evac_time = 0.0; | |
| 736 for (HeapRegion * r = _recorded_survivor_head; | |
| 737 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
| 738 r = r->get_next_young_region()) { | |
| 739 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); | |
| 740 } | |
| 741 return survivor_regions_evac_time; | |
| 742 } | |
| 743 | |
| 342 | 744 void G1CollectorPolicy::check_prediction_validity() { |
| 745 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); | |
| 746 | |
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747 size_t rs_lengths = _g1->young_list()->sampled_rs_lengths(); |
| 342 | 748 if (rs_lengths > _rs_lengths_prediction) { |
| 749 // add 10% to avoid having to recalculate often | |
| 750 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
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751 calculate_young_list_target_length(rs_lengths_prediction); |
| 342 | 752 } |
| 753 } | |
| 754 | |
| 755 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, | |
| 756 bool is_tlab, | |
| 757 bool* gc_overhead_limit_was_exceeded) { | |
| 758 guarantee(false, "Not using this policy feature yet."); | |
| 759 return NULL; | |
| 760 } | |
| 761 | |
| 762 // This method controls how a collector handles one or more | |
| 763 // of its generations being fully allocated. | |
| 764 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
| 765 bool is_tlab) { | |
| 766 guarantee(false, "Not using this policy feature yet."); | |
| 767 return NULL; | |
| 768 } | |
| 769 | |
| 770 | |
| 771 #ifndef PRODUCT | |
| 772 bool G1CollectorPolicy::verify_young_ages() { | |
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773 HeapRegion* head = _g1->young_list()->first_region(); |
| 342 | 774 return |
| 775 verify_young_ages(head, _short_lived_surv_rate_group); | |
| 776 // also call verify_young_ages on any additional surv rate groups | |
| 777 } | |
| 778 | |
| 779 bool | |
| 780 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
| 781 SurvRateGroup *surv_rate_group) { | |
| 782 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
| 783 | |
| 784 const char* name = surv_rate_group->name(); | |
| 785 bool ret = true; | |
| 786 int prev_age = -1; | |
| 787 | |
| 788 for (HeapRegion* curr = head; | |
| 789 curr != NULL; | |
| 790 curr = curr->get_next_young_region()) { | |
| 791 SurvRateGroup* group = curr->surv_rate_group(); | |
| 792 if (group == NULL && !curr->is_survivor()) { | |
| 793 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
| 794 ret = false; | |
| 795 } | |
| 796 | |
| 797 if (surv_rate_group == group) { | |
| 798 int age = curr->age_in_surv_rate_group(); | |
| 799 | |
| 800 if (age < 0) { | |
| 801 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
| 802 ret = false; | |
| 803 } | |
| 804 | |
| 805 if (age <= prev_age) { | |
| 806 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
| 807 "(%d, %d)", name, age, prev_age); | |
| 808 ret = false; | |
| 809 } | |
| 810 prev_age = age; | |
| 811 } | |
| 812 } | |
| 813 | |
| 814 return ret; | |
| 815 } | |
| 816 #endif // PRODUCT | |
| 817 | |
| 818 void G1CollectorPolicy::record_full_collection_start() { | |
| 819 _cur_collection_start_sec = os::elapsedTime(); | |
| 820 // Release the future to-space so that it is available for compaction into. | |
| 821 _g1->set_full_collection(); | |
| 822 } | |
| 823 | |
| 824 void G1CollectorPolicy::record_full_collection_end() { | |
| 825 // Consider this like a collection pause for the purposes of allocation | |
| 826 // since last pause. | |
| 827 double end_sec = os::elapsedTime(); | |
| 828 double full_gc_time_sec = end_sec - _cur_collection_start_sec; | |
| 829 double full_gc_time_ms = full_gc_time_sec * 1000.0; | |
| 830 | |
| 831 _all_full_gc_times_ms->add(full_gc_time_ms); | |
| 832 | |
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833 update_recent_gc_times(end_sec, full_gc_time_ms); |
| 342 | 834 |
| 835 _g1->clear_full_collection(); | |
| 836 | |
| 837 // "Nuke" the heuristics that control the fully/partially young GC | |
| 838 // transitions and make sure we start with fully young GCs after the | |
| 839 // Full GC. | |
| 840 set_full_young_gcs(true); | |
| 841 _last_full_young_gc = false; | |
| 842 _should_revert_to_full_young_gcs = false; | |
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843 clear_initiate_conc_mark_if_possible(); |
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844 clear_during_initial_mark_pause(); |
| 342 | 845 _known_garbage_bytes = 0; |
| 846 _known_garbage_ratio = 0.0; | |
| 847 _in_marking_window = false; | |
| 848 _in_marking_window_im = false; | |
| 849 | |
| 850 _short_lived_surv_rate_group->start_adding_regions(); | |
| 851 // also call this on any additional surv rate groups | |
| 852 | |
| 545 | 853 record_survivor_regions(0, NULL, NULL); |
| 854 | |
| 342 | 855 _prev_region_num_young = _region_num_young; |
| 856 _prev_region_num_tenured = _region_num_tenured; | |
| 857 | |
| 858 _free_regions_at_end_of_collection = _g1->free_regions(); | |
| 545 | 859 // Reset survivors SurvRateGroup. |
| 860 _survivor_surv_rate_group->reset(); | |
| 342 | 861 calculate_young_list_min_length(); |
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862 calculate_young_list_target_length(); |
| 1973 | 863 } |
| 342 | 864 |
| 865 void G1CollectorPolicy::record_before_bytes(size_t bytes) { | |
| 866 _bytes_in_to_space_before_gc += bytes; | |
| 867 } | |
| 868 | |
| 869 void G1CollectorPolicy::record_after_bytes(size_t bytes) { | |
| 870 _bytes_in_to_space_after_gc += bytes; | |
| 871 } | |
| 872 | |
| 873 void G1CollectorPolicy::record_stop_world_start() { | |
| 874 _stop_world_start = os::elapsedTime(); | |
| 875 } | |
| 876 | |
| 877 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, | |
| 878 size_t start_used) { | |
| 879 if (PrintGCDetails) { | |
| 880 gclog_or_tty->stamp(PrintGCTimeStamps); | |
| 881 gclog_or_tty->print("[GC pause"); | |
| 882 if (in_young_gc_mode()) | |
| 883 gclog_or_tty->print(" (%s)", full_young_gcs() ? "young" : "partial"); | |
| 884 } | |
| 885 | |
| 1973 | 886 assert(_g1->used() == _g1->recalculate_used(), |
| 887 err_msg("sanity, used: "SIZE_FORMAT" recalculate_used: "SIZE_FORMAT, | |
| 888 _g1->used(), _g1->recalculate_used())); | |
| 342 | 889 |
| 890 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
| 891 _all_stop_world_times_ms->add(s_w_t_ms); | |
| 892 _stop_world_start = 0.0; | |
| 893 | |
| 894 _cur_collection_start_sec = start_time_sec; | |
| 895 _cur_collection_pause_used_at_start_bytes = start_used; | |
| 896 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); | |
| 897 _pending_cards = _g1->pending_card_num(); | |
| 898 _max_pending_cards = _g1->max_pending_card_num(); | |
| 899 | |
| 900 _bytes_in_to_space_before_gc = 0; | |
| 901 _bytes_in_to_space_after_gc = 0; | |
| 902 _bytes_in_collection_set_before_gc = 0; | |
| 903 | |
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904 YoungList* young_list = _g1->young_list(); |
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905 _eden_bytes_before_gc = young_list->eden_used_bytes(); |
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906 _survivor_bytes_before_gc = young_list->survivor_used_bytes(); |
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907 _capacity_before_gc = _g1->capacity(); |
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908 |
| 342 | 909 #ifdef DEBUG |
| 910 // initialise these to something well known so that we can spot | |
| 911 // if they are not set properly | |
| 912 | |
| 913 for (int i = 0; i < _parallel_gc_threads; ++i) { | |
| 1611 | 914 _par_last_gc_worker_start_times_ms[i] = -1234.0; |
| 915 _par_last_ext_root_scan_times_ms[i] = -1234.0; | |
| 916 _par_last_mark_stack_scan_times_ms[i] = -1234.0; | |
| 917 _par_last_update_rs_times_ms[i] = -1234.0; | |
| 918 _par_last_update_rs_processed_buffers[i] = -1234.0; | |
| 919 _par_last_scan_rs_times_ms[i] = -1234.0; | |
| 920 _par_last_obj_copy_times_ms[i] = -1234.0; | |
| 921 _par_last_termination_times_ms[i] = -1234.0; | |
| 922 _par_last_termination_attempts[i] = -1234.0; | |
| 923 _par_last_gc_worker_end_times_ms[i] = -1234.0; | |
| 2430 | 924 _par_last_gc_worker_times_ms[i] = -1234.0; |
| 342 | 925 } |
| 926 #endif | |
| 927 | |
| 928 for (int i = 0; i < _aux_num; ++i) { | |
| 929 _cur_aux_times_ms[i] = 0.0; | |
| 930 _cur_aux_times_set[i] = false; | |
| 931 } | |
| 932 | |
| 933 _satb_drain_time_set = false; | |
| 934 _last_satb_drain_processed_buffers = -1; | |
| 935 | |
| 936 if (in_young_gc_mode()) | |
| 937 _last_young_gc_full = false; | |
| 938 | |
| 939 // do that for any other surv rate groups | |
| 940 _short_lived_surv_rate_group->stop_adding_regions(); | |
| 1282 | 941 _survivors_age_table.clear(); |
| 545 | 942 |
| 342 | 943 assert( verify_young_ages(), "region age verification" ); |
| 944 } | |
| 945 | |
| 946 void G1CollectorPolicy::record_mark_closure_time(double mark_closure_time_ms) { | |
| 947 _mark_closure_time_ms = mark_closure_time_ms; | |
| 948 } | |
| 949 | |
| 950 void G1CollectorPolicy::record_concurrent_mark_init_start() { | |
| 951 _mark_init_start_sec = os::elapsedTime(); | |
| 952 guarantee(!in_young_gc_mode(), "should not do be here in young GC mode"); | |
| 953 } | |
| 954 | |
| 955 void G1CollectorPolicy::record_concurrent_mark_init_end_pre(double | |
| 956 mark_init_elapsed_time_ms) { | |
| 957 _during_marking = true; | |
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958 assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
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959 clear_during_initial_mark_pause(); |
| 342 | 960 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
| 961 } | |
| 962 | |
| 963 void G1CollectorPolicy::record_concurrent_mark_init_end() { | |
| 964 double end_time_sec = os::elapsedTime(); | |
| 965 double elapsed_time_ms = (end_time_sec - _mark_init_start_sec) * 1000.0; | |
| 966 _concurrent_mark_init_times_ms->add(elapsed_time_ms); | |
| 967 record_concurrent_mark_init_end_pre(elapsed_time_ms); | |
| 968 | |
| 969 _mmu_tracker->add_pause(_mark_init_start_sec, end_time_sec, true); | |
| 970 } | |
| 971 | |
| 972 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
| 973 _mark_remark_start_sec = os::elapsedTime(); | |
| 974 _during_marking = false; | |
| 975 } | |
| 976 | |
| 977 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
| 978 double end_time_sec = os::elapsedTime(); | |
| 979 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
| 980 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
| 981 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
| 982 _prev_collection_pause_end_ms += elapsed_time_ms; | |
| 983 | |
| 984 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
| 985 } | |
| 986 | |
| 987 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
| 988 _mark_cleanup_start_sec = os::elapsedTime(); | |
| 989 } | |
| 990 | |
| 991 void | |
| 992 G1CollectorPolicy::record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
| 993 size_t max_live_bytes) { | |
| 994 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
| 995 record_concurrent_mark_cleanup_end_work2(); | |
| 996 } | |
| 997 | |
| 998 void | |
| 999 G1CollectorPolicy:: | |
| 1000 record_concurrent_mark_cleanup_end_work1(size_t freed_bytes, | |
| 1001 size_t max_live_bytes) { | |
| 1002 if (_n_marks < 2) _n_marks++; | |
| 1003 if (G1PolicyVerbose > 0) | |
| 1004 gclog_or_tty->print_cr("At end of marking, max_live is " SIZE_FORMAT " MB " | |
| 1005 " (of " SIZE_FORMAT " MB heap).", | |
| 1006 max_live_bytes/M, _g1->capacity()/M); | |
| 1007 } | |
| 1008 | |
| 1009 // The important thing about this is that it includes "os::elapsedTime". | |
| 1010 void G1CollectorPolicy::record_concurrent_mark_cleanup_end_work2() { | |
| 1011 double end_time_sec = os::elapsedTime(); | |
| 1012 double elapsed_time_ms = (end_time_sec - _mark_cleanup_start_sec)*1000.0; | |
| 1013 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
| 1014 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
| 1015 _prev_collection_pause_end_ms += elapsed_time_ms; | |
| 1016 | |
| 1017 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_time_sec, true); | |
| 1018 | |
| 1019 _num_markings++; | |
| 1020 | |
| 1021 // We did a marking, so reset the "since_last_mark" variables. | |
| 1022 double considerConcMarkCost = 1.0; | |
| 1023 // If there are available processors, concurrent activity is free... | |
| 1024 if (Threads::number_of_non_daemon_threads() * 2 < | |
| 1025 os::active_processor_count()) { | |
| 1026 considerConcMarkCost = 0.0; | |
| 1027 } | |
| 1028 _n_pauses_at_mark_end = _n_pauses; | |
| 1029 _n_marks_since_last_pause++; | |
| 1030 } | |
| 1031 | |
| 1032 void | |
| 1033 G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { | |
| 1034 if (in_young_gc_mode()) { | |
| 1035 _should_revert_to_full_young_gcs = false; | |
| 1036 _last_full_young_gc = true; | |
| 1037 _in_marking_window = false; | |
| 1038 if (adaptive_young_list_length()) | |
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1039 calculate_young_list_target_length(); |
| 342 | 1040 } |
| 1041 } | |
| 1042 | |
| 1043 void G1CollectorPolicy::record_concurrent_pause() { | |
| 1044 if (_stop_world_start > 0.0) { | |
| 1045 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
| 1046 _all_yield_times_ms->add(yield_ms); | |
| 1047 } | |
| 1048 } | |
| 1049 | |
| 1050 void G1CollectorPolicy::record_concurrent_pause_end() { | |
| 1051 } | |
| 1052 | |
| 1053 void G1CollectorPolicy::record_collection_pause_end_CH_strong_roots() { | |
| 1054 _cur_CH_strong_roots_end_sec = os::elapsedTime(); | |
| 1055 _cur_CH_strong_roots_dur_ms = | |
| 1056 (_cur_CH_strong_roots_end_sec - _cur_collection_start_sec) * 1000.0; | |
| 1057 } | |
| 1058 | |
| 1059 void G1CollectorPolicy::record_collection_pause_end_G1_strong_roots() { | |
| 1060 _cur_G1_strong_roots_end_sec = os::elapsedTime(); | |
| 1061 _cur_G1_strong_roots_dur_ms = | |
| 1062 (_cur_G1_strong_roots_end_sec - _cur_CH_strong_roots_end_sec) * 1000.0; | |
| 1063 } | |
| 1064 | |
| 1065 template<class T> | |
| 1066 T sum_of(T* sum_arr, int start, int n, int N) { | |
| 1067 T sum = (T)0; | |
| 1068 for (int i = 0; i < n; i++) { | |
| 1069 int j = (start + i) % N; | |
| 1070 sum += sum_arr[j]; | |
| 1071 } | |
| 1072 return sum; | |
| 1073 } | |
| 1074 | |
| 1611 | 1075 void G1CollectorPolicy::print_par_stats(int level, |
| 1076 const char* str, | |
| 2430 | 1077 double* data) { |
| 342 | 1078 double min = data[0], max = data[0]; |
| 1079 double total = 0.0; | |
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1080 LineBuffer buf(level); |
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1081 buf.append("[%s (ms):", str); |
| 342 | 1082 for (uint i = 0; i < ParallelGCThreads; ++i) { |
| 1083 double val = data[i]; | |
| 1084 if (val < min) | |
| 1085 min = val; | |
| 1086 if (val > max) | |
| 1087 max = val; | |
| 1088 total += val; | |
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1089 buf.append(" %3.1lf", val); |
| 342 | 1090 } |
| 2430 | 1091 buf.append_and_print_cr(""); |
| 1092 double avg = total / (double) ParallelGCThreads; | |
| 1093 buf.append_and_print_cr(" Avg: %5.1lf, Min: %5.1lf, Max: %5.1lf, Diff: %5.1lf]", | |
| 1094 avg, min, max, max - min); | |
| 342 | 1095 } |
| 1096 | |
| 1611 | 1097 void G1CollectorPolicy::print_par_sizes(int level, |
| 1098 const char* str, | |
| 2430 | 1099 double* data) { |
| 342 | 1100 double min = data[0], max = data[0]; |
| 1101 double total = 0.0; | |
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1102 LineBuffer buf(level); |
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1103 buf.append("[%s :", str); |
| 342 | 1104 for (uint i = 0; i < ParallelGCThreads; ++i) { |
| 1105 double val = data[i]; | |
| 1106 if (val < min) | |
| 1107 min = val; | |
| 1108 if (val > max) | |
| 1109 max = val; | |
| 1110 total += val; | |
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1111 buf.append(" %d", (int) val); |
| 342 | 1112 } |
| 2430 | 1113 buf.append_and_print_cr(""); |
| 1114 double avg = total / (double) ParallelGCThreads; | |
| 1115 buf.append_and_print_cr(" Sum: %d, Avg: %d, Min: %d, Max: %d, Diff: %d]", | |
| 1116 (int)total, (int)avg, (int)min, (int)max, (int)max - (int)min); | |
| 342 | 1117 } |
| 1118 | |
| 1119 void G1CollectorPolicy::print_stats (int level, | |
| 1120 const char* str, | |
| 1121 double value) { | |
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1122 LineBuffer(level).append_and_print_cr("[%s: %5.1lf ms]", str, value); |
| 342 | 1123 } |
| 1124 | |
| 1125 void G1CollectorPolicy::print_stats (int level, | |
| 1126 const char* str, | |
| 1127 int value) { | |
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1128 LineBuffer(level).append_and_print_cr("[%s: %d]", str, value); |
| 342 | 1129 } |
| 1130 | |
| 1131 double G1CollectorPolicy::avg_value (double* data) { | |
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1132 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 1133 double ret = 0.0; |
| 1134 for (uint i = 0; i < ParallelGCThreads; ++i) | |
| 1135 ret += data[i]; | |
| 1136 return ret / (double) ParallelGCThreads; | |
| 1137 } else { | |
| 1138 return data[0]; | |
| 1139 } | |
| 1140 } | |
| 1141 | |
| 1142 double G1CollectorPolicy::max_value (double* data) { | |
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1143 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 1144 double ret = data[0]; |
| 1145 for (uint i = 1; i < ParallelGCThreads; ++i) | |
| 1146 if (data[i] > ret) | |
| 1147 ret = data[i]; | |
| 1148 return ret; | |
| 1149 } else { | |
| 1150 return data[0]; | |
| 1151 } | |
| 1152 } | |
| 1153 | |
| 1154 double G1CollectorPolicy::sum_of_values (double* data) { | |
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1155 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 1156 double sum = 0.0; |
| 1157 for (uint i = 0; i < ParallelGCThreads; i++) | |
| 1158 sum += data[i]; | |
| 1159 return sum; | |
| 1160 } else { | |
| 1161 return data[0]; | |
| 1162 } | |
| 1163 } | |
| 1164 | |
| 1165 double G1CollectorPolicy::max_sum (double* data1, | |
| 1166 double* data2) { | |
| 1167 double ret = data1[0] + data2[0]; | |
| 1168 | |
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1169 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 1170 for (uint i = 1; i < ParallelGCThreads; ++i) { |
| 1171 double data = data1[i] + data2[i]; | |
| 1172 if (data > ret) | |
| 1173 ret = data; | |
| 1174 } | |
| 1175 } | |
| 1176 return ret; | |
| 1177 } | |
| 1178 | |
| 1179 // Anything below that is considered to be zero | |
| 1180 #define MIN_TIMER_GRANULARITY 0.0000001 | |
| 1181 | |
| 1707 | 1182 void G1CollectorPolicy::record_collection_pause_end() { |
| 342 | 1183 double end_time_sec = os::elapsedTime(); |
| 1184 double elapsed_ms = _last_pause_time_ms; | |
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1185 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
| 342 | 1186 double evac_ms = (end_time_sec - _cur_G1_strong_roots_end_sec) * 1000.0; |
| 1187 size_t rs_size = | |
| 1188 _cur_collection_pause_used_regions_at_start - collection_set_size(); | |
| 1189 size_t cur_used_bytes = _g1->used(); | |
| 1190 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
| 1191 bool last_pause_included_initial_mark = false; | |
| 1707 | 1192 bool update_stats = !_g1->evacuation_failed(); |
| 342 | 1193 |
| 1194 #ifndef PRODUCT | |
| 1195 if (G1YoungSurvRateVerbose) { | |
| 1196 gclog_or_tty->print_cr(""); | |
| 1197 _short_lived_surv_rate_group->print(); | |
| 1198 // do that for any other surv rate groups too | |
| 1199 } | |
| 1200 #endif // PRODUCT | |
| 1201 | |
| 1202 if (in_young_gc_mode()) { | |
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1203 last_pause_included_initial_mark = during_initial_mark_pause(); |
| 342 | 1204 if (last_pause_included_initial_mark) |
| 1205 record_concurrent_mark_init_end_pre(0.0); | |
| 1206 | |
| 1207 size_t min_used_targ = | |
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1208 (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
| 342 | 1209 |
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1210 |
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1211 if (!_g1->mark_in_progress() && !_last_full_young_gc) { |
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1212 assert(!last_pause_included_initial_mark, "invariant"); |
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1213 if (cur_used_bytes > min_used_targ && |
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1214 cur_used_bytes > _prev_collection_pause_used_at_end_bytes) { |
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1215 assert(!during_initial_mark_pause(), "we should not see this here"); |
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1216 |
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1217 // Note: this might have already been set, if during the last |
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1218 // pause we decided to start a cycle but at the beginning of |
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1219 // this pause we decided to postpone it. That's OK. |
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1220 set_initiate_conc_mark_if_possible(); |
| 342 | 1221 } |
| 1222 } | |
| 1223 | |
| 1224 _prev_collection_pause_used_at_end_bytes = cur_used_bytes; | |
| 1225 } | |
| 1226 | |
| 1227 _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0, | |
| 1228 end_time_sec, false); | |
| 1229 | |
| 1230 guarantee(_cur_collection_pause_used_regions_at_start >= | |
| 1231 collection_set_size(), | |
| 1232 "Negative RS size?"); | |
| 1233 | |
| 1234 // This assert is exempted when we're doing parallel collection pauses, | |
| 1235 // because the fragmentation caused by the parallel GC allocation buffers | |
| 1236 // can lead to more memory being used during collection than was used | |
| 1237 // before. Best leave this out until the fragmentation problem is fixed. | |
| 1238 // Pauses in which evacuation failed can also lead to negative | |
| 1239 // collections, since no space is reclaimed from a region containing an | |
| 1240 // object whose evacuation failed. | |
| 1241 // Further, we're now always doing parallel collection. But I'm still | |
| 1242 // leaving this here as a placeholder for a more precise assertion later. | |
| 1243 // (DLD, 10/05.) | |
| 1244 assert((true || parallel) // Always using GC LABs now. | |
| 1245 || _g1->evacuation_failed() | |
| 1246 || _cur_collection_pause_used_at_start_bytes >= cur_used_bytes, | |
| 1247 "Negative collection"); | |
| 1248 | |
| 1249 size_t freed_bytes = | |
| 1250 _cur_collection_pause_used_at_start_bytes - cur_used_bytes; | |
| 1251 size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; | |
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1252 |
| 342 | 1253 double survival_fraction = |
| 1254 (double)surviving_bytes/ | |
| 1255 (double)_collection_set_bytes_used_before; | |
| 1256 | |
| 1257 _n_pauses++; | |
| 1258 | |
|
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1259 if (update_stats) { |
| 342 | 1260 _recent_CH_strong_roots_times_ms->add(_cur_CH_strong_roots_dur_ms); |
| 1261 _recent_G1_strong_roots_times_ms->add(_cur_G1_strong_roots_dur_ms); | |
| 1262 _recent_evac_times_ms->add(evac_ms); | |
| 1263 _recent_pause_times_ms->add(elapsed_ms); | |
| 1264 | |
| 1265 _recent_rs_sizes->add(rs_size); | |
| 1266 | |
| 1267 // We exempt parallel collection from this check because Alloc Buffer | |
| 1268 // fragmentation can produce negative collections. Same with evac | |
| 1269 // failure. | |
| 1270 // Further, we're now always doing parallel collection. But I'm still | |
| 1271 // leaving this here as a placeholder for a more precise assertion later. | |
| 1272 // (DLD, 10/05. | |
| 1273 assert((true || parallel) | |
| 1274 || _g1->evacuation_failed() | |
| 1275 || surviving_bytes <= _collection_set_bytes_used_before, | |
| 1276 "Or else negative collection!"); | |
| 1277 _recent_CS_bytes_used_before->add(_collection_set_bytes_used_before); | |
| 1278 _recent_CS_bytes_surviving->add(surviving_bytes); | |
| 1279 | |
| 1280 // this is where we update the allocation rate of the application | |
| 1281 double app_time_ms = | |
| 1282 (_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms); | |
| 1283 if (app_time_ms < MIN_TIMER_GRANULARITY) { | |
| 1284 // This usually happens due to the timer not having the required | |
| 1285 // granularity. Some Linuxes are the usual culprits. | |
| 1286 // We'll just set it to something (arbitrarily) small. | |
| 1287 app_time_ms = 1.0; | |
| 1288 } | |
| 1289 size_t regions_allocated = | |
| 1290 (_region_num_young - _prev_region_num_young) + | |
| 1291 (_region_num_tenured - _prev_region_num_tenured); | |
| 1292 double alloc_rate_ms = (double) regions_allocated / app_time_ms; | |
| 1293 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
| 1294 _prev_region_num_young = _region_num_young; | |
| 1295 _prev_region_num_tenured = _region_num_tenured; | |
| 1296 | |
| 1297 double interval_ms = | |
| 1298 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
| 1299 update_recent_gc_times(end_time_sec, elapsed_ms); | |
| 1300 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; | |
|
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1301 if (recent_avg_pause_time_ratio() < 0.0 || |
|
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1302 (recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
|
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1303 #ifndef PRODUCT |
|
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1304 // Dump info to allow post-facto debugging |
|
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1305 gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
|
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1306 gclog_or_tty->print_cr("-------------------------------------------"); |
|
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1307 gclog_or_tty->print_cr("Recent GC Times (ms):"); |
|
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1308 _recent_gc_times_ms->dump(); |
|
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1309 gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
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1310 _recent_prev_end_times_for_all_gcs_sec->dump(); |
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1311 gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
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1312 _recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
|
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1313 // In debug mode, terminate the JVM if the user wants to debug at this point. |
|
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1314 assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
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1315 #endif // !PRODUCT |
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1316 // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
|
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1317 // CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
|
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1318 if (_recent_avg_pause_time_ratio < 0.0) { |
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1319 _recent_avg_pause_time_ratio = 0.0; |
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1320 } else { |
|
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1321 assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
|
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1322 _recent_avg_pause_time_ratio = 1.0; |
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1323 } |
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1324 } |
| 342 | 1325 } |
| 1326 | |
| 1327 if (G1PolicyVerbose > 1) { | |
| 1328 gclog_or_tty->print_cr(" Recording collection pause(%d)", _n_pauses); | |
| 1329 } | |
| 1330 | |
| 1707 | 1331 PauseSummary* summary = _summary; |
| 342 | 1332 |
| 1333 double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); | |
| 1334 double mark_stack_scan_time = avg_value(_par_last_mark_stack_scan_times_ms); | |
| 1335 double update_rs_time = avg_value(_par_last_update_rs_times_ms); | |
| 1336 double update_rs_processed_buffers = | |
| 1337 sum_of_values(_par_last_update_rs_processed_buffers); | |
| 1338 double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); | |
| 1339 double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); | |
| 1340 double termination_time = avg_value(_par_last_termination_times_ms); | |
| 1341 | |
|
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1342 double parallel_other_time = _cur_collection_par_time_ms - |
|
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1343 (update_rs_time + ext_root_scan_time + mark_stack_scan_time + |
|
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1344 scan_rs_time + obj_copy_time + termination_time); |
|
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1345 if (update_stats) { |
| 342 | 1346 MainBodySummary* body_summary = summary->main_body_summary(); |
| 1347 guarantee(body_summary != NULL, "should not be null!"); | |
| 1348 | |
| 1349 if (_satb_drain_time_set) | |
| 1350 body_summary->record_satb_drain_time_ms(_cur_satb_drain_time_ms); | |
| 1351 else | |
| 1352 body_summary->record_satb_drain_time_ms(0.0); | |
| 1353 body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); | |
| 1354 body_summary->record_mark_stack_scan_time_ms(mark_stack_scan_time); | |
| 1355 body_summary->record_update_rs_time_ms(update_rs_time); | |
| 1356 body_summary->record_scan_rs_time_ms(scan_rs_time); | |
| 1357 body_summary->record_obj_copy_time_ms(obj_copy_time); | |
| 1358 if (parallel) { | |
| 1359 body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); | |
| 1360 body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); | |
| 1361 body_summary->record_termination_time_ms(termination_time); | |
| 1362 body_summary->record_parallel_other_time_ms(parallel_other_time); | |
| 1363 } | |
| 1364 body_summary->record_mark_closure_time_ms(_mark_closure_time_ms); | |
| 1365 } | |
| 1366 | |
| 1367 if (G1PolicyVerbose > 1) { | |
| 1368 gclog_or_tty->print_cr(" ET: %10.6f ms (avg: %10.6f ms)\n" | |
| 1369 " CH Strong: %10.6f ms (avg: %10.6f ms)\n" | |
| 1370 " G1 Strong: %10.6f ms (avg: %10.6f ms)\n" | |
| 1371 " Evac: %10.6f ms (avg: %10.6f ms)\n" | |
| 1372 " ET-RS: %10.6f ms (avg: %10.6f ms)\n" | |
| 1373 " |RS|: " SIZE_FORMAT, | |
| 1374 elapsed_ms, recent_avg_time_for_pauses_ms(), | |
| 1375 _cur_CH_strong_roots_dur_ms, recent_avg_time_for_CH_strong_ms(), | |
| 1376 _cur_G1_strong_roots_dur_ms, recent_avg_time_for_G1_strong_ms(), | |
| 1377 evac_ms, recent_avg_time_for_evac_ms(), | |
| 1378 scan_rs_time, | |
| 1379 recent_avg_time_for_pauses_ms() - | |
| 1380 recent_avg_time_for_G1_strong_ms(), | |
| 1381 rs_size); | |
| 1382 | |
| 1383 gclog_or_tty->print_cr(" Used at start: " SIZE_FORMAT"K" | |
| 1384 " At end " SIZE_FORMAT "K\n" | |
| 1385 " garbage : " SIZE_FORMAT "K" | |
| 1386 " of " SIZE_FORMAT "K\n" | |
| 1387 " survival : %6.2f%% (%6.2f%% avg)", | |
| 1388 _cur_collection_pause_used_at_start_bytes/K, | |
| 1389 _g1->used()/K, freed_bytes/K, | |
| 1390 _collection_set_bytes_used_before/K, | |
| 1391 survival_fraction*100.0, | |
| 1392 recent_avg_survival_fraction()*100.0); | |
| 1393 gclog_or_tty->print_cr(" Recent %% gc pause time: %6.2f", | |
| 1394 recent_avg_pause_time_ratio() * 100.0); | |
| 1395 } | |
| 1396 | |
| 1397 double other_time_ms = elapsed_ms; | |
| 1398 | |
| 1707 | 1399 if (_satb_drain_time_set) { |
| 1400 other_time_ms -= _cur_satb_drain_time_ms; | |
| 1401 } | |
| 1402 | |
| 1403 if (parallel) { | |
| 1404 other_time_ms -= _cur_collection_par_time_ms + _cur_clear_ct_time_ms; | |
| 1405 } else { | |
| 1406 other_time_ms -= | |
| 1407 update_rs_time + | |
| 1408 ext_root_scan_time + mark_stack_scan_time + | |
| 1409 scan_rs_time + obj_copy_time; | |
| 342 | 1410 } |
| 1411 | |
| 1412 if (PrintGCDetails) { | |
| 1707 | 1413 gclog_or_tty->print_cr("%s, %1.8lf secs]", |
| 342 | 1414 (last_pause_included_initial_mark) ? " (initial-mark)" : "", |
| 1415 elapsed_ms / 1000.0); | |
| 1416 | |
| 1707 | 1417 if (_satb_drain_time_set) { |
| 1418 print_stats(1, "SATB Drain Time", _cur_satb_drain_time_ms); | |
| 1419 } | |
| 1420 if (_last_satb_drain_processed_buffers >= 0) { | |
| 1421 print_stats(2, "Processed Buffers", _last_satb_drain_processed_buffers); | |
| 1422 } | |
| 1423 if (parallel) { | |
| 1424 print_stats(1, "Parallel Time", _cur_collection_par_time_ms); | |
| 2430 | 1425 print_par_stats(2, "GC Worker Start Time", _par_last_gc_worker_start_times_ms); |
| 1707 | 1426 print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); |
| 2430 | 1427 print_par_sizes(3, "Processed Buffers", _par_last_update_rs_processed_buffers); |
| 1428 print_par_stats(2, "Ext Root Scanning", _par_last_ext_root_scan_times_ms); | |
| 1429 print_par_stats(2, "Mark Stack Scanning", _par_last_mark_stack_scan_times_ms); | |
| 1707 | 1430 print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms); |
| 1431 print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms); | |
| 1432 print_par_stats(2, "Termination", _par_last_termination_times_ms); | |
| 2430 | 1433 print_par_sizes(3, "Termination Attempts", _par_last_termination_attempts); |
| 1434 print_par_stats(2, "GC Worker End Time", _par_last_gc_worker_end_times_ms); | |
| 1435 | |
| 1436 for (int i = 0; i < _parallel_gc_threads; i++) { | |
| 1437 _par_last_gc_worker_times_ms[i] = _par_last_gc_worker_end_times_ms[i] - _par_last_gc_worker_start_times_ms[i]; | |
| 1438 } | |
| 1439 print_par_stats(2, "GC Worker Times", _par_last_gc_worker_times_ms); | |
| 1440 | |
| 1707 | 1441 print_stats(2, "Other", parallel_other_time); |
| 1442 print_stats(1, "Clear CT", _cur_clear_ct_time_ms); | |
| 1443 } else { | |
| 1444 print_stats(1, "Update RS", update_rs_time); | |
| 1445 print_stats(2, "Processed Buffers", | |
| 1446 (int)update_rs_processed_buffers); | |
| 1447 print_stats(1, "Ext Root Scanning", ext_root_scan_time); | |
| 1448 print_stats(1, "Mark Stack Scanning", mark_stack_scan_time); | |
| 1449 print_stats(1, "Scan RS", scan_rs_time); | |
| 1450 print_stats(1, "Object Copying", obj_copy_time); | |
| 342 | 1451 } |
|
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1452 #ifndef PRODUCT |
|
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1453 print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms); |
|
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1454 print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms); |
|
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1455 print_stats(1, "Min Clear CC", _min_clear_cc_time_ms); |
|
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1456 print_stats(1, "Max Clear CC", _max_clear_cc_time_ms); |
|
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1457 if (_num_cc_clears > 0) { |
|
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1458 print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears)); |
|
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1459 } |
|
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1460 #endif |
| 342 | 1461 print_stats(1, "Other", other_time_ms); |
|
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1462 print_stats(2, "Choose CSet", _recorded_young_cset_choice_time_ms); |
|
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1463 |
| 342 | 1464 for (int i = 0; i < _aux_num; ++i) { |
| 1465 if (_cur_aux_times_set[i]) { | |
| 1466 char buffer[96]; | |
| 1467 sprintf(buffer, "Aux%d", i); | |
| 1468 print_stats(1, buffer, _cur_aux_times_ms[i]); | |
| 1469 } | |
| 1470 } | |
| 1471 } | |
| 1472 | |
| 1473 _all_pause_times_ms->add(elapsed_ms); | |
|
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1474 if (update_stats) { |
|
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1475 summary->record_total_time_ms(elapsed_ms); |
|
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1476 summary->record_other_time_ms(other_time_ms); |
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1477 } |
| 342 | 1478 for (int i = 0; i < _aux_num; ++i) |
| 1479 if (_cur_aux_times_set[i]) | |
| 1480 _all_aux_times_ms[i].add(_cur_aux_times_ms[i]); | |
| 1481 | |
| 1482 // Reset marks-between-pauses counter. | |
| 1483 _n_marks_since_last_pause = 0; | |
| 1484 | |
| 1485 // Update the efficiency-since-mark vars. | |
| 1486 double proc_ms = elapsed_ms * (double) _parallel_gc_threads; | |
| 1487 if (elapsed_ms < MIN_TIMER_GRANULARITY) { | |
| 1488 // This usually happens due to the timer not having the required | |
| 1489 // granularity. Some Linuxes are the usual culprits. | |
| 1490 // We'll just set it to something (arbitrarily) small. | |
| 1491 proc_ms = 1.0; | |
| 1492 } | |
| 1493 double cur_efficiency = (double) freed_bytes / proc_ms; | |
| 1494 | |
| 1495 bool new_in_marking_window = _in_marking_window; | |
| 1496 bool new_in_marking_window_im = false; | |
|
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1497 if (during_initial_mark_pause()) { |
| 342 | 1498 new_in_marking_window = true; |
| 1499 new_in_marking_window_im = true; | |
| 1500 } | |
| 1501 | |
| 1502 if (in_young_gc_mode()) { | |
| 1503 if (_last_full_young_gc) { | |
| 1504 set_full_young_gcs(false); | |
| 1505 _last_full_young_gc = false; | |
| 1506 } | |
| 1507 | |
| 1508 if ( !_last_young_gc_full ) { | |
| 1509 if ( _should_revert_to_full_young_gcs || | |
| 1510 _known_garbage_ratio < 0.05 || | |
| 1511 (adaptive_young_list_length() && | |
| 1512 (get_gc_eff_factor() * cur_efficiency < predict_young_gc_eff())) ) { | |
| 1513 set_full_young_gcs(true); | |
| 1514 } | |
| 1515 } | |
| 1516 _should_revert_to_full_young_gcs = false; | |
| 1517 | |
| 1518 if (_last_young_gc_full && !_during_marking) | |
| 1519 _young_gc_eff_seq->add(cur_efficiency); | |
| 1520 } | |
| 1521 | |
| 1522 _short_lived_surv_rate_group->start_adding_regions(); | |
| 1523 // do that for any other surv rate groupsx | |
| 1524 | |
| 1525 // <NEW PREDICTION> | |
| 1526 | |
| 677 | 1527 if (update_stats) { |
| 342 | 1528 double pause_time_ms = elapsed_ms; |
| 1529 | |
| 1530 size_t diff = 0; | |
| 1531 if (_max_pending_cards >= _pending_cards) | |
| 1532 diff = _max_pending_cards - _pending_cards; | |
| 1533 _pending_card_diff_seq->add((double) diff); | |
| 1534 | |
| 1535 double cost_per_card_ms = 0.0; | |
| 1536 if (_pending_cards > 0) { | |
| 1537 cost_per_card_ms = update_rs_time / (double) _pending_cards; | |
| 1538 _cost_per_card_ms_seq->add(cost_per_card_ms); | |
| 1539 } | |
| 1540 | |
| 1541 size_t cards_scanned = _g1->cards_scanned(); | |
| 1542 | |
| 1543 double cost_per_entry_ms = 0.0; | |
| 1544 if (cards_scanned > 10) { | |
| 1545 cost_per_entry_ms = scan_rs_time / (double) cards_scanned; | |
| 1546 if (_last_young_gc_full) | |
| 1547 _cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
| 1548 else | |
| 1549 _partially_young_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
| 1550 } | |
| 1551 | |
| 1552 if (_max_rs_lengths > 0) { | |
| 1553 double cards_per_entry_ratio = | |
| 1554 (double) cards_scanned / (double) _max_rs_lengths; | |
| 1555 if (_last_young_gc_full) | |
| 1556 _fully_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
| 1557 else | |
| 1558 _partially_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
| 1559 } | |
| 1560 | |
| 1561 size_t rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; | |
| 1562 if (rs_length_diff >= 0) | |
| 1563 _rs_length_diff_seq->add((double) rs_length_diff); | |
| 1564 | |
| 1565 size_t copied_bytes = surviving_bytes; | |
| 1566 double cost_per_byte_ms = 0.0; | |
| 1567 if (copied_bytes > 0) { | |
| 1568 cost_per_byte_ms = obj_copy_time / (double) copied_bytes; | |
| 1569 if (_in_marking_window) | |
| 1570 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); | |
| 1571 else | |
| 1572 _cost_per_byte_ms_seq->add(cost_per_byte_ms); | |
| 1573 } | |
| 1574 | |
| 1575 double all_other_time_ms = pause_time_ms - | |
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1576 (update_rs_time + scan_rs_time + obj_copy_time + |
| 342 | 1577 _mark_closure_time_ms + termination_time); |
| 1578 | |
| 1579 double young_other_time_ms = 0.0; | |
| 1580 if (_recorded_young_regions > 0) { | |
| 1581 young_other_time_ms = | |
| 1582 _recorded_young_cset_choice_time_ms + | |
| 1583 _recorded_young_free_cset_time_ms; | |
| 1584 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / | |
| 1585 (double) _recorded_young_regions); | |
| 1586 } | |
| 1587 double non_young_other_time_ms = 0.0; | |
| 1588 if (_recorded_non_young_regions > 0) { | |
| 1589 non_young_other_time_ms = | |
| 1590 _recorded_non_young_cset_choice_time_ms + | |
| 1591 _recorded_non_young_free_cset_time_ms; | |
| 1592 | |
| 1593 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
| 1594 (double) _recorded_non_young_regions); | |
| 1595 } | |
| 1596 | |
| 1597 double constant_other_time_ms = all_other_time_ms - | |
| 1598 (young_other_time_ms + non_young_other_time_ms); | |
| 1599 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
| 1600 | |
| 1601 double survival_ratio = 0.0; | |
| 1602 if (_bytes_in_collection_set_before_gc > 0) { | |
| 1603 survival_ratio = (double) bytes_in_to_space_during_gc() / | |
| 1604 (double) _bytes_in_collection_set_before_gc; | |
| 1605 } | |
| 1606 | |
| 1607 _pending_cards_seq->add((double) _pending_cards); | |
| 1608 _scanned_cards_seq->add((double) cards_scanned); | |
| 1609 _rs_lengths_seq->add((double) _max_rs_lengths); | |
| 1610 | |
| 1611 double expensive_region_limit_ms = | |
| 751 | 1612 (double) MaxGCPauseMillis - predict_constant_other_time_ms(); |
| 342 | 1613 if (expensive_region_limit_ms < 0.0) { |
| 1614 // this means that the other time was predicted to be longer than | |
| 1615 // than the max pause time | |
| 751 | 1616 expensive_region_limit_ms = (double) MaxGCPauseMillis; |
| 342 | 1617 } |
| 1618 _expensive_region_limit_ms = expensive_region_limit_ms; | |
| 1619 | |
| 1620 if (PREDICTIONS_VERBOSE) { | |
| 1621 gclog_or_tty->print_cr(""); | |
| 1622 gclog_or_tty->print_cr("PREDICTIONS %1.4lf %d " | |
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1623 "REGIONS %d %d %d " |
| 342 | 1624 "PENDING_CARDS %d %d " |
| 1625 "CARDS_SCANNED %d %d " | |
| 1626 "RS_LENGTHS %d %d " | |
| 1627 "RS_UPDATE %1.6lf %1.6lf RS_SCAN %1.6lf %1.6lf " | |
| 1628 "SURVIVAL_RATIO %1.6lf %1.6lf " | |
| 1629 "OBJECT_COPY %1.6lf %1.6lf OTHER_CONSTANT %1.6lf %1.6lf " | |
| 1630 "OTHER_YOUNG %1.6lf %1.6lf " | |
| 1631 "OTHER_NON_YOUNG %1.6lf %1.6lf " | |
| 1632 "VTIME_DIFF %1.6lf TERMINATION %1.6lf " | |
| 1633 "ELAPSED %1.6lf %1.6lf ", | |
| 1634 _cur_collection_start_sec, | |
| 1635 (!_last_young_gc_full) ? 2 : | |
| 1636 (last_pause_included_initial_mark) ? 1 : 0, | |
| 1637 _recorded_region_num, | |
| 1638 _recorded_young_regions, | |
| 1639 _recorded_non_young_regions, | |
| 1640 _predicted_pending_cards, _pending_cards, | |
| 1641 _predicted_cards_scanned, cards_scanned, | |
| 1642 _predicted_rs_lengths, _max_rs_lengths, | |
| 1643 _predicted_rs_update_time_ms, update_rs_time, | |
| 1644 _predicted_rs_scan_time_ms, scan_rs_time, | |
| 1645 _predicted_survival_ratio, survival_ratio, | |
| 1646 _predicted_object_copy_time_ms, obj_copy_time, | |
| 1647 _predicted_constant_other_time_ms, constant_other_time_ms, | |
| 1648 _predicted_young_other_time_ms, young_other_time_ms, | |
| 1649 _predicted_non_young_other_time_ms, | |
| 1650 non_young_other_time_ms, | |
| 1651 _vtime_diff_ms, termination_time, | |
| 1652 _predicted_pause_time_ms, elapsed_ms); | |
| 1653 } | |
| 1654 | |
| 1655 if (G1PolicyVerbose > 0) { | |
| 1656 gclog_or_tty->print_cr("Pause Time, predicted: %1.4lfms (predicted %s), actual: %1.4lfms", | |
| 1657 _predicted_pause_time_ms, | |
| 1658 (_within_target) ? "within" : "outside", | |
| 1659 elapsed_ms); | |
| 1660 } | |
| 1661 | |
| 1662 } | |
| 1663 | |
| 1664 _in_marking_window = new_in_marking_window; | |
| 1665 _in_marking_window_im = new_in_marking_window_im; | |
| 1666 _free_regions_at_end_of_collection = _g1->free_regions(); | |
| 1667 calculate_young_list_min_length(); | |
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1668 calculate_young_list_target_length(); |
| 342 | 1669 |
| 1111 | 1670 // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
| 1282 | 1671 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
| 1111 | 1672 adjust_concurrent_refinement(update_rs_time, update_rs_processed_buffers, update_rs_time_goal_ms); |
| 342 | 1673 // </NEW PREDICTION> |
| 1674 } | |
| 1675 | |
|
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1676 #define EXT_SIZE_FORMAT "%d%s" |
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1677 #define EXT_SIZE_PARAMS(bytes) \ |
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1678 byte_size_in_proper_unit((bytes)), \ |
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1679 proper_unit_for_byte_size((bytes)) |
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1680 |
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1681 void G1CollectorPolicy::print_heap_transition() { |
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1682 if (PrintGCDetails) { |
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1683 YoungList* young_list = _g1->young_list(); |
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1684 size_t eden_bytes = young_list->eden_used_bytes(); |
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1685 size_t survivor_bytes = young_list->survivor_used_bytes(); |
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1686 size_t used_before_gc = _cur_collection_pause_used_at_start_bytes; |
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1687 size_t used = _g1->used(); |
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1688 size_t capacity = _g1->capacity(); |
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1689 |
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1690 gclog_or_tty->print_cr( |
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1691 " [Eden: "EXT_SIZE_FORMAT"->"EXT_SIZE_FORMAT" " |
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1692 "Survivors: "EXT_SIZE_FORMAT"->"EXT_SIZE_FORMAT" " |
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1693 "Heap: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->" |
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1694 EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")]", |
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1695 EXT_SIZE_PARAMS(_eden_bytes_before_gc), |
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1696 EXT_SIZE_PARAMS(eden_bytes), |
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1697 EXT_SIZE_PARAMS(_survivor_bytes_before_gc), |
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1698 EXT_SIZE_PARAMS(survivor_bytes), |
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1699 EXT_SIZE_PARAMS(used_before_gc), |
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1700 EXT_SIZE_PARAMS(_capacity_before_gc), |
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1701 EXT_SIZE_PARAMS(used), |
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1702 EXT_SIZE_PARAMS(capacity)); |
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1703 } else if (PrintGC) { |
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1704 _g1->print_size_transition(gclog_or_tty, |
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1705 _cur_collection_pause_used_at_start_bytes, |
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1706 _g1->used(), _g1->capacity()); |
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1707 } |
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1708 } |
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1709 |
| 342 | 1710 // <NEW PREDICTION> |
| 1711 | |
| 1111 | 1712 void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
| 1713 double update_rs_processed_buffers, | |
| 1714 double goal_ms) { | |
| 1715 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 1716 ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); | |
| 1717 | |
| 1282 | 1718 if (G1UseAdaptiveConcRefinement) { |
| 1111 | 1719 const int k_gy = 3, k_gr = 6; |
| 1720 const double inc_k = 1.1, dec_k = 0.9; | |
| 1721 | |
| 1722 int g = cg1r->green_zone(); | |
| 1723 if (update_rs_time > goal_ms) { | |
| 1724 g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. | |
| 1725 } else { | |
| 1726 if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { | |
| 1727 g = (int)MAX2(g * inc_k, g + 1.0); | |
| 1728 } | |
| 1729 } | |
| 1730 // Change the refinement threads params | |
| 1731 cg1r->set_green_zone(g); | |
| 1732 cg1r->set_yellow_zone(g * k_gy); | |
| 1733 cg1r->set_red_zone(g * k_gr); | |
| 1734 cg1r->reinitialize_threads(); | |
| 1735 | |
| 1736 int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); | |
| 1737 int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, | |
| 1738 cg1r->yellow_zone()); | |
| 1739 // Change the barrier params | |
| 1740 dcqs.set_process_completed_threshold(processing_threshold); | |
| 1741 dcqs.set_max_completed_queue(cg1r->red_zone()); | |
| 1742 } | |
| 1743 | |
| 1744 int curr_queue_size = dcqs.completed_buffers_num(); | |
| 1745 if (curr_queue_size >= cg1r->yellow_zone()) { | |
| 1746 dcqs.set_completed_queue_padding(curr_queue_size); | |
| 1747 } else { | |
| 1748 dcqs.set_completed_queue_padding(0); | |
| 1749 } | |
| 1750 dcqs.notify_if_necessary(); | |
| 1751 } | |
| 1752 | |
| 342 | 1753 double |
| 1754 G1CollectorPolicy:: | |
| 1755 predict_young_collection_elapsed_time_ms(size_t adjustment) { | |
| 1756 guarantee( adjustment == 0 || adjustment == 1, "invariant" ); | |
| 1757 | |
| 1758 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
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1759 size_t young_num = g1h->young_list()->length(); |
| 342 | 1760 if (young_num == 0) |
| 1761 return 0.0; | |
| 1762 | |
| 1763 young_num += adjustment; | |
| 1764 size_t pending_cards = predict_pending_cards(); | |
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1765 size_t rs_lengths = g1h->young_list()->sampled_rs_lengths() + |
| 342 | 1766 predict_rs_length_diff(); |
| 1767 size_t card_num; | |
| 1768 if (full_young_gcs()) | |
| 1769 card_num = predict_young_card_num(rs_lengths); | |
| 1770 else | |
| 1771 card_num = predict_non_young_card_num(rs_lengths); | |
| 1772 size_t young_byte_size = young_num * HeapRegion::GrainBytes; | |
| 1773 double accum_yg_surv_rate = | |
| 1774 _short_lived_surv_rate_group->accum_surv_rate(adjustment); | |
| 1775 | |
| 1776 size_t bytes_to_copy = | |
| 1777 (size_t) (accum_yg_surv_rate * (double) HeapRegion::GrainBytes); | |
| 1778 | |
| 1779 return | |
| 1780 predict_rs_update_time_ms(pending_cards) + | |
| 1781 predict_rs_scan_time_ms(card_num) + | |
| 1782 predict_object_copy_time_ms(bytes_to_copy) + | |
| 1783 predict_young_other_time_ms(young_num) + | |
| 1784 predict_constant_other_time_ms(); | |
| 1785 } | |
| 1786 | |
| 1787 double | |
| 1788 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { | |
| 1789 size_t rs_length = predict_rs_length_diff(); | |
| 1790 size_t card_num; | |
| 1791 if (full_young_gcs()) | |
| 1792 card_num = predict_young_card_num(rs_length); | |
| 1793 else | |
| 1794 card_num = predict_non_young_card_num(rs_length); | |
| 1795 return predict_base_elapsed_time_ms(pending_cards, card_num); | |
| 1796 } | |
| 1797 | |
| 1798 double | |
| 1799 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
| 1800 size_t scanned_cards) { | |
| 1801 return | |
| 1802 predict_rs_update_time_ms(pending_cards) + | |
| 1803 predict_rs_scan_time_ms(scanned_cards) + | |
| 1804 predict_constant_other_time_ms(); | |
| 1805 } | |
| 1806 | |
| 1807 double | |
| 1808 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
| 1809 bool young) { | |
| 1810 size_t rs_length = hr->rem_set()->occupied(); | |
| 1811 size_t card_num; | |
| 1812 if (full_young_gcs()) | |
| 1813 card_num = predict_young_card_num(rs_length); | |
| 1814 else | |
| 1815 card_num = predict_non_young_card_num(rs_length); | |
| 1816 size_t bytes_to_copy = predict_bytes_to_copy(hr); | |
| 1817 | |
| 1818 double region_elapsed_time_ms = | |
| 1819 predict_rs_scan_time_ms(card_num) + | |
| 1820 predict_object_copy_time_ms(bytes_to_copy); | |
| 1821 | |
| 1822 if (young) | |
| 1823 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
| 1824 else | |
| 1825 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
| 1826 | |
| 1827 return region_elapsed_time_ms; | |
| 1828 } | |
| 1829 | |
| 1830 size_t | |
| 1831 G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { | |
| 1832 size_t bytes_to_copy; | |
| 1833 if (hr->is_marked()) | |
| 1834 bytes_to_copy = hr->max_live_bytes(); | |
| 1835 else { | |
| 1836 guarantee( hr->is_young() && hr->age_in_surv_rate_group() != -1, | |
| 1837 "invariant" ); | |
| 1838 int age = hr->age_in_surv_rate_group(); | |
| 545 | 1839 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
| 342 | 1840 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
| 1841 } | |
| 1842 | |
| 1843 return bytes_to_copy; | |
| 1844 } | |
| 1845 | |
| 1846 void | |
| 1847 G1CollectorPolicy::start_recording_regions() { | |
| 1848 _recorded_rs_lengths = 0; | |
| 1849 _recorded_young_regions = 0; | |
| 1850 _recorded_non_young_regions = 0; | |
| 1851 | |
| 1852 #if PREDICTIONS_VERBOSE | |
| 1853 _recorded_marked_bytes = 0; | |
| 1854 _recorded_young_bytes = 0; | |
| 1855 _predicted_bytes_to_copy = 0; | |
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1856 _predicted_rs_lengths = 0; |
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1857 _predicted_cards_scanned = 0; |
| 342 | 1858 #endif // PREDICTIONS_VERBOSE |
| 1859 } | |
| 1860 | |
| 1861 void | |
|
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1862 G1CollectorPolicy::record_cset_region_info(HeapRegion* hr, bool young) { |
| 342 | 1863 #if PREDICTIONS_VERBOSE |
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1864 if (!young) { |
| 342 | 1865 _recorded_marked_bytes += hr->max_live_bytes(); |
| 1866 } | |
| 1867 _predicted_bytes_to_copy += predict_bytes_to_copy(hr); | |
| 1868 #endif // PREDICTIONS_VERBOSE | |
| 1869 | |
| 1870 size_t rs_length = hr->rem_set()->occupied(); | |
| 1871 _recorded_rs_lengths += rs_length; | |
| 1872 } | |
| 1873 | |
| 1874 void | |
|
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1875 G1CollectorPolicy::record_non_young_cset_region(HeapRegion* hr) { |
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1876 assert(!hr->is_young(), "should not call this"); |
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1877 ++_recorded_non_young_regions; |
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1878 record_cset_region_info(hr, false); |
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1879 } |
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1880 |
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1881 void |
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1882 G1CollectorPolicy::set_recorded_young_regions(size_t n_regions) { |
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1883 _recorded_young_regions = n_regions; |
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1884 } |
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1885 |
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1886 void G1CollectorPolicy::set_recorded_young_bytes(size_t bytes) { |
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1887 #if PREDICTIONS_VERBOSE |
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1888 _recorded_young_bytes = bytes; |
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1889 #endif // PREDICTIONS_VERBOSE |
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1890 } |
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1891 |
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1892 void G1CollectorPolicy::set_recorded_rs_lengths(size_t rs_lengths) { |
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1893 _recorded_rs_lengths = rs_lengths; |
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1894 } |
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1895 |
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1896 void G1CollectorPolicy::set_predicted_bytes_to_copy(size_t bytes) { |
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1897 _predicted_bytes_to_copy = bytes; |
| 342 | 1898 } |
| 1899 | |
| 1900 void | |
| 1901 G1CollectorPolicy::end_recording_regions() { | |
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1902 // The _predicted_pause_time_ms field is referenced in code |
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1903 // not under PREDICTIONS_VERBOSE. Let's initialize it. |
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1904 _predicted_pause_time_ms = -1.0; |
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1905 |
| 342 | 1906 #if PREDICTIONS_VERBOSE |
| 1907 _predicted_pending_cards = predict_pending_cards(); | |
| 1908 _predicted_rs_lengths = _recorded_rs_lengths + predict_rs_length_diff(); | |
| 1909 if (full_young_gcs()) | |
| 1910 _predicted_cards_scanned += predict_young_card_num(_predicted_rs_lengths); | |
| 1911 else | |
| 1912 _predicted_cards_scanned += | |
| 1913 predict_non_young_card_num(_predicted_rs_lengths); | |
| 1914 _recorded_region_num = _recorded_young_regions + _recorded_non_young_regions; | |
| 1915 | |
| 1916 _predicted_rs_update_time_ms = | |
| 1917 predict_rs_update_time_ms(_g1->pending_card_num()); | |
| 1918 _predicted_rs_scan_time_ms = | |
| 1919 predict_rs_scan_time_ms(_predicted_cards_scanned); | |
| 1920 _predicted_object_copy_time_ms = | |
| 1921 predict_object_copy_time_ms(_predicted_bytes_to_copy); | |
| 1922 _predicted_constant_other_time_ms = | |
| 1923 predict_constant_other_time_ms(); | |
| 1924 _predicted_young_other_time_ms = | |
| 1925 predict_young_other_time_ms(_recorded_young_regions); | |
| 1926 _predicted_non_young_other_time_ms = | |
| 1927 predict_non_young_other_time_ms(_recorded_non_young_regions); | |
| 1928 | |
| 1929 _predicted_pause_time_ms = | |
| 1930 _predicted_rs_update_time_ms + | |
| 1931 _predicted_rs_scan_time_ms + | |
| 1932 _predicted_object_copy_time_ms + | |
| 1933 _predicted_constant_other_time_ms + | |
| 1934 _predicted_young_other_time_ms + | |
| 1935 _predicted_non_young_other_time_ms; | |
| 1936 #endif // PREDICTIONS_VERBOSE | |
| 1937 } | |
| 1938 | |
| 1939 void G1CollectorPolicy::check_if_region_is_too_expensive(double | |
| 1940 predicted_time_ms) { | |
| 1941 // I don't think we need to do this when in young GC mode since | |
| 1942 // marking will be initiated next time we hit the soft limit anyway... | |
| 1943 if (predicted_time_ms > _expensive_region_limit_ms) { | |
| 1944 if (!in_young_gc_mode()) { | |
| 1945 set_full_young_gcs(true); | |
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1946 // We might want to do something different here. However, |
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1947 // right now we don't support the non-generational G1 mode |
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1948 // (and in fact we are planning to remove the associated code, |
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1949 // see CR 6814390). So, let's leave it as is and this will be |
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1950 // removed some time in the future |
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1951 ShouldNotReachHere(); |
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1952 set_during_initial_mark_pause(); |
| 342 | 1953 } else |
| 1954 // no point in doing another partial one | |
| 1955 _should_revert_to_full_young_gcs = true; | |
| 1956 } | |
| 1957 } | |
| 1958 | |
| 1959 // </NEW PREDICTION> | |
| 1960 | |
| 1961 | |
| 1962 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, | |
| 1963 double elapsed_ms) { | |
| 1964 _recent_gc_times_ms->add(elapsed_ms); | |
| 1965 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
| 1966 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
| 1967 } | |
| 1968 | |
| 1969 double G1CollectorPolicy::recent_avg_time_for_pauses_ms() { | |
| 751 | 1970 if (_recent_pause_times_ms->num() == 0) return (double) MaxGCPauseMillis; |
| 342 | 1971 else return _recent_pause_times_ms->avg(); |
| 1972 } | |
| 1973 | |
| 1974 double G1CollectorPolicy::recent_avg_time_for_CH_strong_ms() { | |
| 1975 if (_recent_CH_strong_roots_times_ms->num() == 0) | |
| 751 | 1976 return (double)MaxGCPauseMillis/3.0; |
| 342 | 1977 else return _recent_CH_strong_roots_times_ms->avg(); |
| 1978 } | |
| 1979 | |
| 1980 double G1CollectorPolicy::recent_avg_time_for_G1_strong_ms() { | |
| 1981 if (_recent_G1_strong_roots_times_ms->num() == 0) | |
| 751 | 1982 return (double)MaxGCPauseMillis/3.0; |
| 342 | 1983 else return _recent_G1_strong_roots_times_ms->avg(); |
| 1984 } | |
| 1985 | |
| 1986 double G1CollectorPolicy::recent_avg_time_for_evac_ms() { | |
| 751 | 1987 if (_recent_evac_times_ms->num() == 0) return (double)MaxGCPauseMillis/3.0; |
| 342 | 1988 else return _recent_evac_times_ms->avg(); |
| 1989 } | |
| 1990 | |
| 1991 int G1CollectorPolicy::number_of_recent_gcs() { | |
| 1992 assert(_recent_CH_strong_roots_times_ms->num() == | |
| 1993 _recent_G1_strong_roots_times_ms->num(), "Sequence out of sync"); | |
| 1994 assert(_recent_G1_strong_roots_times_ms->num() == | |
| 1995 _recent_evac_times_ms->num(), "Sequence out of sync"); | |
| 1996 assert(_recent_evac_times_ms->num() == | |
| 1997 _recent_pause_times_ms->num(), "Sequence out of sync"); | |
| 1998 assert(_recent_pause_times_ms->num() == | |
| 1999 _recent_CS_bytes_used_before->num(), "Sequence out of sync"); | |
| 2000 assert(_recent_CS_bytes_used_before->num() == | |
| 2001 _recent_CS_bytes_surviving->num(), "Sequence out of sync"); | |
| 2002 return _recent_pause_times_ms->num(); | |
| 2003 } | |
| 2004 | |
| 2005 double G1CollectorPolicy::recent_avg_survival_fraction() { | |
| 2006 return recent_avg_survival_fraction_work(_recent_CS_bytes_surviving, | |
| 2007 _recent_CS_bytes_used_before); | |
| 2008 } | |
| 2009 | |
| 2010 double G1CollectorPolicy::last_survival_fraction() { | |
| 2011 return last_survival_fraction_work(_recent_CS_bytes_surviving, | |
| 2012 _recent_CS_bytes_used_before); | |
| 2013 } | |
| 2014 | |
| 2015 double | |
| 2016 G1CollectorPolicy::recent_avg_survival_fraction_work(TruncatedSeq* surviving, | |
| 2017 TruncatedSeq* before) { | |
| 2018 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
| 2019 if (before->sum() > 0.0) { | |
| 2020 double recent_survival_rate = surviving->sum() / before->sum(); | |
| 2021 // We exempt parallel collection from this check because Alloc Buffer | |
| 2022 // fragmentation can produce negative collections. | |
| 2023 // Further, we're now always doing parallel collection. But I'm still | |
| 2024 // leaving this here as a placeholder for a more precise assertion later. | |
| 2025 // (DLD, 10/05.) | |
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2026 assert((true || G1CollectedHeap::use_parallel_gc_threads()) || |
| 342 | 2027 _g1->evacuation_failed() || |
| 2028 recent_survival_rate <= 1.0, "Or bad frac"); | |
| 2029 return recent_survival_rate; | |
| 2030 } else { | |
| 2031 return 1.0; // Be conservative. | |
| 2032 } | |
| 2033 } | |
| 2034 | |
| 2035 double | |
| 2036 G1CollectorPolicy::last_survival_fraction_work(TruncatedSeq* surviving, | |
| 2037 TruncatedSeq* before) { | |
| 2038 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
| 2039 if (surviving->num() > 0 && before->last() > 0.0) { | |
| 2040 double last_survival_rate = surviving->last() / before->last(); | |
| 2041 // We exempt parallel collection from this check because Alloc Buffer | |
| 2042 // fragmentation can produce negative collections. | |
| 2043 // Further, we're now always doing parallel collection. But I'm still | |
| 2044 // leaving this here as a placeholder for a more precise assertion later. | |
| 2045 // (DLD, 10/05.) | |
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2046 assert((true || G1CollectedHeap::use_parallel_gc_threads()) || |
| 342 | 2047 last_survival_rate <= 1.0, "Or bad frac"); |
| 2048 return last_survival_rate; | |
| 2049 } else { | |
| 2050 return 1.0; | |
| 2051 } | |
| 2052 } | |
| 2053 | |
| 2054 static const int survival_min_obs = 5; | |
| 2055 static double survival_min_obs_limits[] = { 0.9, 0.7, 0.5, 0.3, 0.1 }; | |
| 2056 static const double min_survival_rate = 0.1; | |
| 2057 | |
| 2058 double | |
| 2059 G1CollectorPolicy::conservative_avg_survival_fraction_work(double avg, | |
| 2060 double latest) { | |
| 2061 double res = avg; | |
| 2062 if (number_of_recent_gcs() < survival_min_obs) { | |
| 2063 res = MAX2(res, survival_min_obs_limits[number_of_recent_gcs()]); | |
| 2064 } | |
| 2065 res = MAX2(res, latest); | |
| 2066 res = MAX2(res, min_survival_rate); | |
| 2067 // In the parallel case, LAB fragmentation can produce "negative | |
| 2068 // collections"; so can evac failure. Cap at 1.0 | |
| 2069 res = MIN2(res, 1.0); | |
| 2070 return res; | |
| 2071 } | |
| 2072 | |
| 2073 size_t G1CollectorPolicy::expansion_amount() { | |
| 1356 | 2074 if ((recent_avg_pause_time_ratio() * 100.0) > _gc_overhead_perc) { |
| 751 | 2075 // We will double the existing space, or take |
| 2076 // G1ExpandByPercentOfAvailable % of the available expansion | |
| 2077 // space, whichever is smaller, bounded below by a minimum | |
| 2078 // expansion (unless that's all that's left.) | |
| 342 | 2079 const size_t min_expand_bytes = 1*M; |
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2080 size_t reserved_bytes = _g1->max_capacity(); |
| 342 | 2081 size_t committed_bytes = _g1->capacity(); |
| 2082 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
| 2083 size_t expand_bytes; | |
| 2084 size_t expand_bytes_via_pct = | |
| 751 | 2085 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
| 342 | 2086 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
| 2087 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
| 2088 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
| 2089 if (G1PolicyVerbose > 1) { | |
| 2090 gclog_or_tty->print("Decided to expand: ratio = %5.2f, " | |
| 2091 "committed = %d%s, uncommited = %d%s, via pct = %d%s.\n" | |
| 2092 " Answer = %d.\n", | |
| 2093 recent_avg_pause_time_ratio(), | |
| 2094 byte_size_in_proper_unit(committed_bytes), | |
| 2095 proper_unit_for_byte_size(committed_bytes), | |
| 2096 byte_size_in_proper_unit(uncommitted_bytes), | |
| 2097 proper_unit_for_byte_size(uncommitted_bytes), | |
| 2098 byte_size_in_proper_unit(expand_bytes_via_pct), | |
| 2099 proper_unit_for_byte_size(expand_bytes_via_pct), | |
| 2100 byte_size_in_proper_unit(expand_bytes), | |
| 2101 proper_unit_for_byte_size(expand_bytes)); | |
| 2102 } | |
| 2103 return expand_bytes; | |
| 2104 } else { | |
| 2105 return 0; | |
| 2106 } | |
| 2107 } | |
| 2108 | |
| 2109 void G1CollectorPolicy::note_start_of_mark_thread() { | |
| 2110 _mark_thread_startup_sec = os::elapsedTime(); | |
| 2111 } | |
| 2112 | |
| 2113 class CountCSClosure: public HeapRegionClosure { | |
| 2114 G1CollectorPolicy* _g1_policy; | |
| 2115 public: | |
| 2116 CountCSClosure(G1CollectorPolicy* g1_policy) : | |
| 2117 _g1_policy(g1_policy) {} | |
| 2118 bool doHeapRegion(HeapRegion* r) { | |
| 2119 _g1_policy->_bytes_in_collection_set_before_gc += r->used(); | |
| 2120 return false; | |
| 2121 } | |
| 2122 }; | |
| 2123 | |
| 2124 void G1CollectorPolicy::count_CS_bytes_used() { | |
| 2125 CountCSClosure cs_closure(this); | |
| 2126 _g1->collection_set_iterate(&cs_closure); | |
| 2127 } | |
| 2128 | |
| 2129 void G1CollectorPolicy::print_summary (int level, | |
| 2130 const char* str, | |
| 2131 NumberSeq* seq) const { | |
| 2132 double sum = seq->sum(); | |
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2133 LineBuffer(level + 1).append_and_print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", |
| 342 | 2134 str, sum / 1000.0, seq->avg()); |
| 2135 } | |
| 2136 | |
| 2137 void G1CollectorPolicy::print_summary_sd (int level, | |
| 2138 const char* str, | |
| 2139 NumberSeq* seq) const { | |
| 2140 print_summary(level, str, seq); | |
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2141 LineBuffer(level + 6).append_and_print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", |
| 342 | 2142 seq->num(), seq->sd(), seq->maximum()); |
| 2143 } | |
| 2144 | |
| 2145 void G1CollectorPolicy::check_other_times(int level, | |
| 2146 NumberSeq* other_times_ms, | |
| 2147 NumberSeq* calc_other_times_ms) const { | |
| 2148 bool should_print = false; | |
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2149 LineBuffer buf(level + 2); |
| 342 | 2150 |
| 2151 double max_sum = MAX2(fabs(other_times_ms->sum()), | |
| 2152 fabs(calc_other_times_ms->sum())); | |
| 2153 double min_sum = MIN2(fabs(other_times_ms->sum()), | |
| 2154 fabs(calc_other_times_ms->sum())); | |
| 2155 double sum_ratio = max_sum / min_sum; | |
| 2156 if (sum_ratio > 1.1) { | |
| 2157 should_print = true; | |
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2158 buf.append_and_print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); |
| 342 | 2159 } |
| 2160 | |
| 2161 double max_avg = MAX2(fabs(other_times_ms->avg()), | |
| 2162 fabs(calc_other_times_ms->avg())); | |
| 2163 double min_avg = MIN2(fabs(other_times_ms->avg()), | |
| 2164 fabs(calc_other_times_ms->avg())); | |
| 2165 double avg_ratio = max_avg / min_avg; | |
| 2166 if (avg_ratio > 1.1) { | |
| 2167 should_print = true; | |
|
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2188
diff
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|
2168 buf.append_and_print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); |
| 342 | 2169 } |
| 2170 | |
| 2171 if (other_times_ms->sum() < -0.01) { | |
|
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diff
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|
2172 buf.append_and_print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); |
| 342 | 2173 } |
| 2174 | |
| 2175 if (other_times_ms->avg() < -0.01) { | |
|
2363
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2188
diff
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|
2176 buf.append_and_print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); |
| 342 | 2177 } |
| 2178 | |
| 2179 if (calc_other_times_ms->sum() < -0.01) { | |
| 2180 should_print = true; | |
|
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2188
diff
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|
2181 buf.append_and_print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); |
| 342 | 2182 } |
| 2183 | |
| 2184 if (calc_other_times_ms->avg() < -0.01) { | |
| 2185 should_print = true; | |
|
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2188
diff
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|
2186 buf.append_and_print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); |
| 342 | 2187 } |
| 2188 | |
| 2189 if (should_print) | |
| 2190 print_summary(level, "Other(Calc)", calc_other_times_ms); | |
| 2191 } | |
| 2192 | |
| 2193 void G1CollectorPolicy::print_summary(PauseSummary* summary) const { | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1779
diff
changeset
|
2194 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
| 342 | 2195 MainBodySummary* body_summary = summary->main_body_summary(); |
| 2196 if (summary->get_total_seq()->num() > 0) { | |
| 677 | 2197 print_summary_sd(0, "Evacuation Pauses", summary->get_total_seq()); |
| 342 | 2198 if (body_summary != NULL) { |
| 2199 print_summary(1, "SATB Drain", body_summary->get_satb_drain_seq()); | |
| 2200 if (parallel) { | |
| 2201 print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); | |
| 2202 print_summary(2, "Update RS", body_summary->get_update_rs_seq()); | |
| 2203 print_summary(2, "Ext Root Scanning", | |
| 2204 body_summary->get_ext_root_scan_seq()); | |
| 2205 print_summary(2, "Mark Stack Scanning", | |
| 2206 body_summary->get_mark_stack_scan_seq()); | |
| 2207 print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); | |
| 2208 print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); | |
| 2209 print_summary(2, "Termination", body_summary->get_termination_seq()); | |
| 2210 print_summary(2, "Other", body_summary->get_parallel_other_seq()); | |
| 2211 { | |
| 2212 NumberSeq* other_parts[] = { | |
| 2213 body_summary->get_update_rs_seq(), | |
| 2214 body_summary->get_ext_root_scan_seq(), | |
| 2215 body_summary->get_mark_stack_scan_seq(), | |
| 2216 body_summary->get_scan_rs_seq(), | |
| 2217 body_summary->get_obj_copy_seq(), | |
| 2218 body_summary->get_termination_seq() | |
| 2219 }; | |
| 2220 NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), | |
| 1779 | 2221 6, other_parts); |
| 342 | 2222 check_other_times(2, body_summary->get_parallel_other_seq(), |
| 2223 &calc_other_times_ms); | |
| 2224 } | |
| 2225 print_summary(1, "Mark Closure", body_summary->get_mark_closure_seq()); | |
| 2226 print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); | |
| 2227 } else { | |
| 2228 print_summary(1, "Update RS", body_summary->get_update_rs_seq()); | |
| 2229 print_summary(1, "Ext Root Scanning", | |
| 2230 body_summary->get_ext_root_scan_seq()); | |
| 2231 print_summary(1, "Mark Stack Scanning", | |
| 2232 body_summary->get_mark_stack_scan_seq()); | |
| 2233 print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); | |
| 2234 print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); | |
| 2235 } | |
| 2236 } | |
| 2237 print_summary(1, "Other", summary->get_other_seq()); | |
| 2238 { | |
| 1779 | 2239 if (body_summary != NULL) { |
| 2240 NumberSeq calc_other_times_ms; | |
| 2241 if (parallel) { | |
| 2242 // parallel | |
| 2243 NumberSeq* other_parts[] = { | |
| 2244 body_summary->get_satb_drain_seq(), | |
| 2245 body_summary->get_parallel_seq(), | |
| 2246 body_summary->get_clear_ct_seq() | |
| 2247 }; | |
| 2248 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
| 2249 3, other_parts); | |
| 2250 } else { | |
| 2251 // serial | |
| 2252 NumberSeq* other_parts[] = { | |
| 2253 body_summary->get_satb_drain_seq(), | |
| 2254 body_summary->get_update_rs_seq(), | |
| 2255 body_summary->get_ext_root_scan_seq(), | |
| 2256 body_summary->get_mark_stack_scan_seq(), | |
| 2257 body_summary->get_scan_rs_seq(), | |
| 2258 body_summary->get_obj_copy_seq() | |
| 2259 }; | |
| 2260 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
| 2261 6, other_parts); | |
| 2262 } | |
| 2263 check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); | |
| 342 | 2264 } |
| 2265 } | |
| 2266 } else { | |
|
2363
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|
2267 LineBuffer(1).append_and_print_cr("none"); |
| 342 | 2268 } |
|
2363
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|
2269 LineBuffer(0).append_and_print_cr(""); |
| 342 | 2270 } |
| 2271 | |
| 2272 void G1CollectorPolicy::print_tracing_info() const { | |
| 2273 if (TraceGen0Time) { | |
| 2274 gclog_or_tty->print_cr("ALL PAUSES"); | |
| 2275 print_summary_sd(0, "Total", _all_pause_times_ms); | |
| 2276 gclog_or_tty->print_cr(""); | |
| 2277 gclog_or_tty->print_cr(""); | |
| 2278 gclog_or_tty->print_cr(" Full Young GC Pauses: %8d", _full_young_pause_num); | |
| 2279 gclog_or_tty->print_cr(" Partial Young GC Pauses: %8d", _partial_young_pause_num); | |
| 2280 gclog_or_tty->print_cr(""); | |
| 2281 | |
| 677 | 2282 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
| 2283 print_summary(_summary); | |
| 342 | 2284 |
| 2285 gclog_or_tty->print_cr("MISC"); | |
| 2286 print_summary_sd(0, "Stop World", _all_stop_world_times_ms); | |
| 2287 print_summary_sd(0, "Yields", _all_yield_times_ms); | |
| 2288 for (int i = 0; i < _aux_num; ++i) { | |
| 2289 if (_all_aux_times_ms[i].num() > 0) { | |
| 2290 char buffer[96]; | |
| 2291 sprintf(buffer, "Aux%d", i); | |
| 2292 print_summary_sd(0, buffer, &_all_aux_times_ms[i]); | |
| 2293 } | |
| 2294 } | |
| 2295 | |
| 2296 size_t all_region_num = _region_num_young + _region_num_tenured; | |
| 2297 gclog_or_tty->print_cr(" New Regions %8d, Young %8d (%6.2lf%%), " | |
| 2298 "Tenured %8d (%6.2lf%%)", | |
| 2299 all_region_num, | |
| 2300 _region_num_young, | |
| 2301 (double) _region_num_young / (double) all_region_num * 100.0, | |
| 2302 _region_num_tenured, | |
| 2303 (double) _region_num_tenured / (double) all_region_num * 100.0); | |
| 2304 } | |
| 2305 if (TraceGen1Time) { | |
| 2306 if (_all_full_gc_times_ms->num() > 0) { | |
| 2307 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", | |
| 2308 _all_full_gc_times_ms->num(), | |
| 2309 _all_full_gc_times_ms->sum() / 1000.0); | |
| 2310 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); | |
| 2311 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", | |
| 2312 _all_full_gc_times_ms->sd(), | |
| 2313 _all_full_gc_times_ms->maximum()); | |
| 2314 } | |
| 2315 } | |
| 2316 } | |
| 2317 | |
| 2318 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
| 2319 #ifndef PRODUCT | |
| 2320 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
| 2321 // add this call for any other surv rate groups | |
| 2322 #endif // PRODUCT | |
| 2323 } | |
| 2324 | |
| 1973 | 2325 void |
| 2326 G1CollectorPolicy::update_region_num(bool young) { | |
| 2327 if (young) { | |
| 342 | 2328 ++_region_num_young; |
| 2329 } else { | |
| 2330 ++_region_num_tenured; | |
| 2331 } | |
| 2332 } | |
| 2333 | |
| 2334 #ifndef PRODUCT | |
| 2335 // for debugging, bit of a hack... | |
| 2336 static char* | |
| 2337 region_num_to_mbs(int length) { | |
| 2338 static char buffer[64]; | |
| 2339 double bytes = (double) (length * HeapRegion::GrainBytes); | |
| 2340 double mbs = bytes / (double) (1024 * 1024); | |
| 2341 sprintf(buffer, "%7.2lfMB", mbs); | |
| 2342 return buffer; | |
| 2343 } | |
| 2344 #endif // PRODUCT | |
| 2345 | |
| 545 | 2346 size_t G1CollectorPolicy::max_regions(int purpose) { |
| 342 | 2347 switch (purpose) { |
| 2348 case GCAllocForSurvived: | |
| 545 | 2349 return _max_survivor_regions; |
| 342 | 2350 case GCAllocForTenured: |
| 545 | 2351 return REGIONS_UNLIMITED; |
| 342 | 2352 default: |
| 545 | 2353 ShouldNotReachHere(); |
| 2354 return REGIONS_UNLIMITED; | |
| 342 | 2355 }; |
| 2356 } | |
| 2357 | |
|
1991
016a3628c885
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diff
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|
2358 void G1CollectorPolicy::calculate_max_gc_locker_expansion() { |
|
016a3628c885
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1973
diff
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|
2359 size_t expansion_region_num = 0; |
|
016a3628c885
6994056: G1: when GC locker is active, extend the Eden instead of allocating into the old gen
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1973
diff
changeset
|
2360 if (GCLockerEdenExpansionPercent > 0) { |
|
016a3628c885
6994056: G1: when GC locker is active, extend the Eden instead of allocating into the old gen
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1973
diff
changeset
|
2361 double perc = (double) GCLockerEdenExpansionPercent / 100.0; |
|
016a3628c885
6994056: G1: when GC locker is active, extend the Eden instead of allocating into the old gen
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1973
diff
changeset
|
2362 double expansion_region_num_d = perc * (double) _young_list_target_length; |
|
016a3628c885
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1973
diff
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|
2363 // We use ceiling so that if expansion_region_num_d is > 0.0 (but |
|
016a3628c885
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tonyp
parents:
1973
diff
changeset
|
2364 // less than 1.0) we'll get 1. |
|
016a3628c885
6994056: G1: when GC locker is active, extend the Eden instead of allocating into the old gen
tonyp
parents:
1973
diff
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|
2365 expansion_region_num = (size_t) ceil(expansion_region_num_d); |
|
016a3628c885
6994056: G1: when GC locker is active, extend the Eden instead of allocating into the old gen
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1973
diff
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|
2366 } else { |
|
016a3628c885
6994056: G1: when GC locker is active, extend the Eden instead of allocating into the old gen
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1973
diff
changeset
|
2367 assert(expansion_region_num == 0, "sanity"); |
|
016a3628c885
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tonyp
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1973
diff
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|
2368 } |
|
016a3628c885
6994056: G1: when GC locker is active, extend the Eden instead of allocating into the old gen
tonyp
parents:
1973
diff
changeset
|
2369 _young_list_max_length = _young_list_target_length + expansion_region_num; |
|
016a3628c885
6994056: G1: when GC locker is active, extend the Eden instead of allocating into the old gen
tonyp
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1973
diff
changeset
|
2370 assert(_young_list_target_length <= _young_list_max_length, "post-condition"); |
|
016a3628c885
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1973
diff
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|
2371 } |
|
016a3628c885
6994056: G1: when GC locker is active, extend the Eden instead of allocating into the old gen
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diff
changeset
|
2372 |
| 545 | 2373 // Calculates survivor space parameters. |
| 2374 void G1CollectorPolicy::calculate_survivors_policy() | |
| 2375 { | |
| 2376 if (G1FixedSurvivorSpaceSize == 0) { | |
| 2377 _max_survivor_regions = _young_list_target_length / SurvivorRatio; | |
| 2378 } else { | |
|
547
1e458753107d
6802413: G1: G1FixedSurvivorSpaceSize should be converted into regions in calculate_survivors_policy()
apetrusenko
parents:
545
diff
changeset
|
2379 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
| 545 | 2380 } |
| 2381 | |
| 2382 if (G1FixedTenuringThreshold) { | |
| 2383 _tenuring_threshold = MaxTenuringThreshold; | |
| 2384 } else { | |
| 2385 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( | |
| 2386 HeapRegion::GrainWords * _max_survivor_regions); | |
| 2387 } | |
| 2388 } | |
| 2389 | |
| 342 | 2390 #ifndef PRODUCT |
| 2391 class HRSortIndexIsOKClosure: public HeapRegionClosure { | |
| 2392 CollectionSetChooser* _chooser; | |
| 2393 public: | |
| 2394 HRSortIndexIsOKClosure(CollectionSetChooser* chooser) : | |
| 2395 _chooser(chooser) {} | |
| 2396 | |
| 2397 bool doHeapRegion(HeapRegion* r) { | |
| 2398 if (!r->continuesHumongous()) { | |
| 2399 assert(_chooser->regionProperlyOrdered(r), "Ought to be."); | |
| 2400 } | |
| 2401 return false; | |
| 2402 } | |
| 2403 }; | |
| 2404 | |
| 2405 bool G1CollectorPolicy_BestRegionsFirst::assertMarkedBytesDataOK() { | |
| 2406 HRSortIndexIsOKClosure cl(_collectionSetChooser); | |
| 2407 _g1->heap_region_iterate(&cl); | |
| 2408 return true; | |
| 2409 } | |
| 2410 #endif | |
| 2411 | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
diff
changeset
|
2412 bool |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
changeset
|
2413 G1CollectorPolicy::force_initial_mark_if_outside_cycle() { |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2414 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
diff
changeset
|
2415 if (!during_cycle) { |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2416 set_initiate_conc_mark_if_possible(); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2417 return true; |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2418 } else { |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2419 return false; |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
diff
changeset
|
2420 } |
|
4e5661ba9d98
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diff
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|
2421 } |
|
4e5661ba9d98
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|
2422 |
| 342 | 2423 void |
|
1359
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|
2424 G1CollectorPolicy::decide_on_conc_mark_initiation() { |
|
23b1b27ac76c
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diff
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|
2425 // We are about to decide on whether this pause will be an |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
diff
changeset
|
2426 // initial-mark pause. |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
diff
changeset
|
2427 |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
changeset
|
2428 // First, during_initial_mark_pause() should not be already set. We |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
changeset
|
2429 // will set it here if we have to. However, it should be cleared by |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
changeset
|
2430 // the end of the pause (it's only set for the duration of an |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
changeset
|
2431 // initial-mark pause). |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
changeset
|
2432 assert(!during_initial_mark_pause(), "pre-condition"); |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
changeset
|
2433 |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
changeset
|
2434 if (initiate_conc_mark_if_possible()) { |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
changeset
|
2435 // We had noticed on a previous pause that the heap occupancy has |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
changeset
|
2436 // gone over the initiating threshold and we should start a |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
changeset
|
2437 // concurrent marking cycle. So we might initiate one. |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1356
diff
changeset
|
2438 |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1356
diff
changeset
|
2439 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
changeset
|
2440 if (!during_cycle) { |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
changeset
|
2441 // The concurrent marking thread is not "during a cycle", i.e., |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
changeset
|
2442 // it has completed the last one. So we can go ahead and |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
changeset
|
2443 // initiate a new cycle. |
|
23b1b27ac76c
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2444 |
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2445 set_during_initial_mark_pause(); |
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2446 |
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2447 // And we can now clear initiate_conc_mark_if_possible() as |
|
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2448 // we've already acted on it. |
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2449 clear_initiate_conc_mark_if_possible(); |
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2450 } else { |
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2451 // The concurrent marking thread is still finishing up the |
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2452 // previous cycle. If we start one right now the two cycles |
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2453 // overlap. In particular, the concurrent marking thread might |
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2454 // be in the process of clearing the next marking bitmap (which |
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2455 // we will use for the next cycle if we start one). Starting a |
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2456 // cycle now will be bad given that parts of the marking |
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2457 // information might get cleared by the marking thread. And we |
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2458 // cannot wait for the marking thread to finish the cycle as it |
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2459 // periodically yields while clearing the next marking bitmap |
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2460 // and, if it's in a yield point, it's waiting for us to |
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2461 // finish. So, at this point we will not start a cycle and we'll |
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2462 // let the concurrent marking thread complete the last one. |
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2463 } |
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2464 } |
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2465 } |
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2466 |
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2467 void |
| 342 | 2468 G1CollectorPolicy_BestRegionsFirst:: |
| 2469 record_collection_pause_start(double start_time_sec, size_t start_used) { | |
| 2470 G1CollectorPolicy::record_collection_pause_start(start_time_sec, start_used); | |
| 2471 } | |
| 2472 | |
| 2473 class KnownGarbageClosure: public HeapRegionClosure { | |
| 2474 CollectionSetChooser* _hrSorted; | |
| 2475 | |
| 2476 public: | |
| 2477 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
| 2478 _hrSorted(hrSorted) | |
| 2479 {} | |
| 2480 | |
| 2481 bool doHeapRegion(HeapRegion* r) { | |
| 2482 // We only include humongous regions in collection | |
| 2483 // sets when concurrent mark shows that their contained object is | |
| 2484 // unreachable. | |
| 2485 | |
| 2486 // Do we have any marking information for this region? | |
| 2487 if (r->is_marked()) { | |
| 2488 // We don't include humongous regions in collection | |
| 2489 // sets because we collect them immediately at the end of a marking | |
| 2490 // cycle. We also don't include young regions because we *must* | |
| 2491 // include them in the next collection pause. | |
| 2492 if (!r->isHumongous() && !r->is_young()) { | |
| 2493 _hrSorted->addMarkedHeapRegion(r); | |
| 2494 } | |
| 2495 } | |
| 2496 return false; | |
| 2497 } | |
| 2498 }; | |
| 2499 | |
| 2500 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
| 2501 CollectionSetChooser* _hrSorted; | |
| 2502 jint _marked_regions_added; | |
| 2503 jint _chunk_size; | |
| 2504 jint _cur_chunk_idx; | |
| 2505 jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) | |
| 2506 int _worker; | |
| 2507 int _invokes; | |
| 2508 | |
| 2509 void get_new_chunk() { | |
| 2510 _cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size); | |
| 2511 _cur_chunk_end = _cur_chunk_idx + _chunk_size; | |
| 2512 } | |
| 2513 void add_region(HeapRegion* r) { | |
| 2514 if (_cur_chunk_idx == _cur_chunk_end) { | |
| 2515 get_new_chunk(); | |
| 2516 } | |
| 2517 assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); | |
| 2518 _hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r); | |
| 2519 _marked_regions_added++; | |
| 2520 _cur_chunk_idx++; | |
| 2521 } | |
| 2522 | |
| 2523 public: | |
| 2524 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
| 2525 jint chunk_size, | |
| 2526 int worker) : | |
| 2527 _hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker), | |
| 2528 _marked_regions_added(0), _cur_chunk_idx(0), _cur_chunk_end(0), | |
| 2529 _invokes(0) | |
| 2530 {} | |
| 2531 | |
| 2532 bool doHeapRegion(HeapRegion* r) { | |
| 2533 // We only include humongous regions in collection | |
| 2534 // sets when concurrent mark shows that their contained object is | |
| 2535 // unreachable. | |
| 2536 _invokes++; | |
| 2537 | |
| 2538 // Do we have any marking information for this region? | |
| 2539 if (r->is_marked()) { | |
| 2540 // We don't include humongous regions in collection | |
| 2541 // sets because we collect them immediately at the end of a marking | |
| 2542 // cycle. | |
| 2543 // We also do not include young regions in collection sets | |
| 2544 if (!r->isHumongous() && !r->is_young()) { | |
| 2545 add_region(r); | |
| 2546 } | |
| 2547 } | |
| 2548 return false; | |
| 2549 } | |
| 2550 jint marked_regions_added() { return _marked_regions_added; } | |
| 2551 int invokes() { return _invokes; } | |
| 2552 }; | |
| 2553 | |
| 2554 class ParKnownGarbageTask: public AbstractGangTask { | |
| 2555 CollectionSetChooser* _hrSorted; | |
| 2556 jint _chunk_size; | |
| 2557 G1CollectedHeap* _g1; | |
| 2558 public: | |
| 2559 ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) : | |
| 2560 AbstractGangTask("ParKnownGarbageTask"), | |
| 2561 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
| 2562 _g1(G1CollectedHeap::heap()) | |
| 2563 {} | |
| 2564 | |
| 2565 void work(int i) { | |
| 2566 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size, i); | |
| 2567 // Back to zero for the claim value. | |
| 355 | 2568 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, i, |
| 2569 HeapRegion::InitialClaimValue); | |
| 342 | 2570 jint regions_added = parKnownGarbageCl.marked_regions_added(); |
| 2571 _hrSorted->incNumMarkedHeapRegions(regions_added); | |
| 2572 if (G1PrintParCleanupStats) { | |
|
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2573 gclog_or_tty->print_cr(" Thread %d called %d times, added %d regions to list.", |
| 342 | 2574 i, parKnownGarbageCl.invokes(), regions_added); |
| 2575 } | |
| 2576 } | |
| 2577 }; | |
| 2578 | |
| 2579 void | |
| 2580 G1CollectorPolicy_BestRegionsFirst:: | |
| 2581 record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
| 2582 size_t max_live_bytes) { | |
| 2583 double start; | |
| 2584 if (G1PrintParCleanupStats) start = os::elapsedTime(); | |
| 2585 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
| 2586 | |
| 2587 _collectionSetChooser->clearMarkedHeapRegions(); | |
| 2588 double clear_marked_end; | |
| 2589 if (G1PrintParCleanupStats) { | |
| 2590 clear_marked_end = os::elapsedTime(); | |
| 2591 gclog_or_tty->print_cr(" clear marked regions + work1: %8.3f ms.", | |
| 2592 (clear_marked_end - start)*1000.0); | |
| 2593 } | |
|
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2594 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 2595 const size_t OverpartitionFactor = 4; |
|
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2596 const size_t MinWorkUnit = 8; |
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2597 const size_t WorkUnit = |
| 342 | 2598 MAX2(_g1->n_regions() / (ParallelGCThreads * OverpartitionFactor), |
|
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2599 MinWorkUnit); |
| 342 | 2600 _collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(), |
|
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2601 WorkUnit); |
| 342 | 2602 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
|
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2603 (int) WorkUnit); |
| 342 | 2604 _g1->workers()->run_task(&parKnownGarbageTask); |
| 355 | 2605 |
| 2606 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 2607 "sanity check"); | |
| 342 | 2608 } else { |
| 2609 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
| 2610 _g1->heap_region_iterate(&knownGarbagecl); | |
| 2611 } | |
| 2612 double known_garbage_end; | |
| 2613 if (G1PrintParCleanupStats) { | |
| 2614 known_garbage_end = os::elapsedTime(); | |
| 2615 gclog_or_tty->print_cr(" compute known garbage: %8.3f ms.", | |
| 2616 (known_garbage_end - clear_marked_end)*1000.0); | |
| 2617 } | |
| 2618 _collectionSetChooser->sortMarkedHeapRegions(); | |
| 2619 double sort_end; | |
| 2620 if (G1PrintParCleanupStats) { | |
| 2621 sort_end = os::elapsedTime(); | |
| 2622 gclog_or_tty->print_cr(" sorting: %8.3f ms.", | |
| 2623 (sort_end - known_garbage_end)*1000.0); | |
| 2624 } | |
| 2625 | |
| 2626 record_concurrent_mark_cleanup_end_work2(); | |
| 2627 double work2_end; | |
| 2628 if (G1PrintParCleanupStats) { | |
| 2629 work2_end = os::elapsedTime(); | |
| 2630 gclog_or_tty->print_cr(" work2: %8.3f ms.", | |
| 2631 (work2_end - sort_end)*1000.0); | |
| 2632 } | |
| 2633 } | |
| 2634 | |
|
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2635 // Add the heap region at the head of the non-incremental collection set |
| 342 | 2636 void G1CollectorPolicy:: |
| 2637 add_to_collection_set(HeapRegion* hr) { | |
|
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2638 assert(_inc_cset_build_state == Active, "Precondition"); |
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2639 assert(!hr->is_young(), "non-incremental add of young region"); |
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2640 |
| 342 | 2641 if (_g1->mark_in_progress()) |
| 2642 _g1->concurrent_mark()->registerCSetRegion(hr); | |
| 2643 | |
|
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2644 assert(!hr->in_collection_set(), "should not already be in the CSet"); |
| 342 | 2645 hr->set_in_collection_set(true); |
| 2646 hr->set_next_in_collection_set(_collection_set); | |
| 2647 _collection_set = hr; | |
| 2648 _collection_set_size++; | |
| 2649 _collection_set_bytes_used_before += hr->used(); | |
| 526 | 2650 _g1->register_region_with_in_cset_fast_test(hr); |
| 342 | 2651 } |
| 2652 | |
|
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2653 // Initialize the per-collection-set information |
|
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2654 void G1CollectorPolicy::start_incremental_cset_building() { |
|
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2655 assert(_inc_cset_build_state == Inactive, "Precondition"); |
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2656 |
|
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|
2657 _inc_cset_head = NULL; |
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2658 _inc_cset_tail = NULL; |
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2659 _inc_cset_size = 0; |
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2660 _inc_cset_bytes_used_before = 0; |
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2661 |
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2662 if (in_young_gc_mode()) { |
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2663 _inc_cset_young_index = 0; |
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|
2664 } |
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2665 |
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2666 _inc_cset_max_finger = 0; |
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2667 _inc_cset_recorded_young_bytes = 0; |
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2668 _inc_cset_recorded_rs_lengths = 0; |
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2669 _inc_cset_predicted_elapsed_time_ms = 0; |
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2670 _inc_cset_predicted_bytes_to_copy = 0; |
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2671 _inc_cset_build_state = Active; |
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|
2672 } |
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2673 |
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2674 void G1CollectorPolicy::add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length) { |
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2675 // This routine is used when: |
|
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2676 // * adding survivor regions to the incremental cset at the end of an |
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2677 // evacuation pause, |
|
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2678 // * adding the current allocation region to the incremental cset |
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2679 // when it is retired, and |
|
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2680 // * updating existing policy information for a region in the |
|
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2681 // incremental cset via young list RSet sampling. |
|
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2682 // Therefore this routine may be called at a safepoint by the |
|
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2683 // VM thread, or in-between safepoints by mutator threads (when |
|
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2684 // retiring the current allocation region) or a concurrent |
|
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2685 // refine thread (RSet sampling). |
|
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2686 |
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|
2687 double region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, true); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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|
2688 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
|
2689 |
|
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
|
2690 _inc_cset_recorded_rs_lengths += 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
|
2691 _inc_cset_predicted_elapsed_time_ms += region_elapsed_time_ms; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2692 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2693 _inc_cset_bytes_used_before += used_bytes; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2694 |
|
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 // Cache the values we have added to the aggregated informtion |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2696 // in the heap region in case we have to remove this region from |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2697 // the incremental collection set, or it is updated by the |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2698 // rset sampling code |
|
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 hr->set_recorded_rs_length(rs_length); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2700 hr->set_predicted_elapsed_time_ms(region_elapsed_time_ms); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2701 |
|
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 #if PREDICTIONS_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2703 size_t bytes_to_copy = predict_bytes_to_copy(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
|
2704 _inc_cset_predicted_bytes_to_copy += bytes_to_copy; |
|
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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
|
2705 |
|
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 // Record the number of bytes used in this region |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2707 _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:
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diff
changeset
|
2708 |
|
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
|
2709 // Cache the values we have added to the aggregated informtion |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2710 // in the heap region in case we have to remove this region from |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2711 // the incremental collection set, or it is updated by the |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2712 // rset sampling code |
|
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_predicted_bytes_to_copy(bytes_to_copy); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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changeset
|
2714 #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
|
2715 } |
|
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
|
2716 |
|
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
|
2717 void G1CollectorPolicy::remove_from_incremental_cset_info(HeapRegion* hr) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2718 // This routine is currently only called as part of the updating of |
|
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 // 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
|
2720 // is performed by the concurrent refine thread(s) as part of young list |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2721 // RSet sampling. Therefore we should not be at a 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
|
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 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
|
2724 assert(hr->is_young(), "it should be"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2725 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2726 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
|
2727 size_t old_rs_length = hr->recorded_rs_length(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2728 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
|
2729 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2730 // Subtract the old recorded/predicted policy information for |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2731 // the given heap region from the collection set info. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2732 _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
|
2733 _inc_cset_predicted_elapsed_time_ms -= old_elapsed_time_ms; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2734 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2735 _inc_cset_bytes_used_before -= used_bytes; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2736 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2737 // Clear the values cached in the heap region |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2738 hr->set_recorded_rs_length(0); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2739 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
|
2740 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2741 #if PREDICTIONS_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2742 size_t old_predicted_bytes_to_copy = hr->predicted_bytes_to_copy(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2743 _inc_cset_predicted_bytes_to_copy -= old_predicted_bytes_to_copy; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2744 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2745 // Subtract the number of bytes used in this region |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2746 _inc_cset_recorded_young_bytes -= used_bytes; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2747 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2748 // Clear the values cached in the heap region |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2749 hr->set_predicted_bytes_to_copy(0); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2750 #endif // PREDICTIONS_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2751 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2752 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2753 void G1CollectorPolicy::update_incremental_cset_info(HeapRegion* hr, size_t new_rs_length) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2754 // Update the collection set information that is dependent on the new RS length |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2755 assert(hr->is_young(), "Precondition"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2756 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2757 remove_from_incremental_cset_info(hr); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2758 add_to_incremental_cset_info(hr, new_rs_length); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2759 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2760 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2761 void G1CollectorPolicy::add_region_to_incremental_cset_common(HeapRegion* hr) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2762 assert( hr->is_young(), "invariant"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2763 assert( hr->young_index_in_cset() == -1, "invariant" ); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2764 assert(_inc_cset_build_state == Active, "Precondition"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2765 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2766 // We need to clear and set the cached recorded/cached collection set |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2767 // information in the heap region here (before the region gets added |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2768 // to the collection set). An individual heap region's cached values |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2769 // are calculated, aggregated with the policy collection set info, |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2770 // and cached in the heap region here (initially) and (subsequently) |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2771 // by the Young List sampling code. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2772 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2773 size_t rs_length = hr->rem_set()->occupied(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2774 add_to_incremental_cset_info(hr, rs_length); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2775 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2776 HeapWord* hr_end = hr->end(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2777 _inc_cset_max_finger = MAX2(_inc_cset_max_finger, hr_end); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2778 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2779 assert(!hr->in_collection_set(), "invariant"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2780 hr->set_in_collection_set(true); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2781 assert( hr->next_in_collection_set() == NULL, "invariant"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2782 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2783 _inc_cset_size++; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2784 _g1->register_region_with_in_cset_fast_test(hr); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2785 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2786 hr->set_young_index_in_cset((int) _inc_cset_young_index); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2787 ++_inc_cset_young_index; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2788 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2789 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2790 // Add the region at the RHS of the incremental cset |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2791 void G1CollectorPolicy::add_region_to_incremental_cset_rhs(HeapRegion* hr) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2792 // We should only ever be appending survivors at the end of a pause |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2793 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
|
2794 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2795 // Do the 'common' stuff |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2796 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
|
2797 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2798 // Now add the region at the right hand side |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2799 if (_inc_cset_tail == NULL) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2800 assert(_inc_cset_head == NULL, "invariant"); |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2801 _inc_cset_head = 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
|
2802 } else { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2803 _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
johnc
parents:
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diff
changeset
|
2804 } |
|
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
|
2805 _inc_cset_tail = 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
|
2806 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2807 |
|
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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
|
2808 // 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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diff
changeset
|
2809 void G1CollectorPolicy::add_region_to_incremental_cset_lhs(HeapRegion* hr) { |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2810 // Survivors should be added to the RHS at the end of a pause |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2811 assert(!hr->is_survivor(), "Logic"); |
|
1316cec51b4d
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parents:
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|
2812 |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2813 // Do the 'common' stuff |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
2814 add_region_to_incremental_cset_common(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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|
2815 |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2816 // Add the region at the left hand side |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2817 hr->set_next_in_collection_set(_inc_cset_head); |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2818 if (_inc_cset_head == NULL) { |
|
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changeset
|
2819 assert(_inc_cset_tail == NULL, "Invariant"); |
|
1316cec51b4d
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changeset
|
2820 _inc_cset_tail = hr; |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2821 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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changeset
|
2822 _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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changeset
|
2823 } |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2824 |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2825 #ifndef PRODUCT |
|
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|
2826 void G1CollectorPolicy::print_collection_set(HeapRegion* list_head, outputStream* st) { |
|
1316cec51b4d
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|
2827 assert(list_head == inc_cset_head() || list_head == collection_set(), "must be"); |
|
1316cec51b4d
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|
2828 |
|
1316cec51b4d
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changeset
|
2829 st->print_cr("\nCollection_set:"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2830 HeapRegion* csr = list_head; |
|
1316cec51b4d
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changeset
|
2831 while (csr != NULL) { |
|
1316cec51b4d
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|
2832 HeapRegion* next = csr->next_in_collection_set(); |
|
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changeset
|
2833 assert(csr->in_collection_set(), "bad CS"); |
|
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|
2834 st->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2835 "age: %4d, y: %d, surv: %d", |
|
1316cec51b4d
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parents:
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changeset
|
2836 csr->bottom(), csr->end(), |
|
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changeset
|
2837 csr->top(), |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2838 csr->prev_top_at_mark_start(), |
|
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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
|
2839 csr->next_top_at_mark_start(), |
|
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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
|
2840 csr->top_at_conc_mark_count(), |
|
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
|
2841 csr->age_in_surv_rate_group_cond(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2842 csr->is_young(), |
|
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parents:
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changeset
|
2843 csr->is_survivor()); |
|
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parents:
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changeset
|
2844 csr = next; |
|
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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
|
2845 } |
|
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parents:
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diff
changeset
|
2846 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2847 #endif // !PRODUCT |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2848 |
| 1707 | 2849 void |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2850 G1CollectorPolicy_BestRegionsFirst::choose_collection_set( |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2851 double target_pause_time_ms) { |
|
1394
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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|
2852 // Set this here - in case we're not doing young collections. |
|
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changeset
|
2853 double non_young_start_time_sec = os::elapsedTime(); |
|
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parents:
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|
2854 |
| 342 | 2855 start_recording_regions(); |
| 2856 | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2857 guarantee(target_pause_time_ms > 0.0, |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2858 err_msg("target_pause_time_ms = %1.6lf should be positive", |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2859 target_pause_time_ms)); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2860 guarantee(_collection_set == NULL, "Precondition"); |
| 342 | 2861 |
| 2862 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
| 2863 double predicted_pause_time_ms = base_time_ms; | |
| 2864 | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2865 double time_remaining_ms = target_pause_time_ms - base_time_ms; |
| 342 | 2866 |
| 2867 // the 10% and 50% values are arbitrary... | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2868 if (time_remaining_ms < 0.10 * target_pause_time_ms) { |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2869 time_remaining_ms = 0.50 * target_pause_time_ms; |
| 342 | 2870 _within_target = false; |
| 2871 } else { | |
| 2872 _within_target = true; | |
| 2873 } | |
| 2874 | |
| 2875 // We figure out the number of bytes available for future to-space. | |
| 2876 // For new regions without marking information, we must assume the | |
| 2877 // worst-case of complete survival. If we have marking information for a | |
| 2878 // region, we can bound the amount of live data. We can add a number of | |
| 2879 // such regions, as long as the sum of the live data bounds does not | |
| 2880 // exceed the available evacuation space. | |
| 2881 size_t max_live_bytes = _g1->free_regions() * HeapRegion::GrainBytes; | |
| 2882 | |
| 2883 size_t expansion_bytes = | |
| 2884 _g1->expansion_regions() * HeapRegion::GrainBytes; | |
| 2885 | |
| 677 | 2886 _collection_set_bytes_used_before = 0; |
| 2887 _collection_set_size = 0; | |
| 342 | 2888 |
| 2889 // Adjust for expansion and slop. | |
| 2890 max_live_bytes = max_live_bytes + expansion_bytes; | |
| 2891 | |
| 2892 HeapRegion* hr; | |
| 2893 if (in_young_gc_mode()) { | |
| 2894 double young_start_time_sec = os::elapsedTime(); | |
| 2895 | |
| 2896 if (G1PolicyVerbose > 0) { | |
| 2897 gclog_or_tty->print_cr("Adding %d young regions to the CSet", | |
|
1394
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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
|
2898 _g1->young_list()->length()); |
| 342 | 2899 } |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2900 |
| 342 | 2901 _young_cset_length = 0; |
| 2902 _last_young_gc_full = full_young_gcs() ? true : false; | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2903 |
| 342 | 2904 if (_last_young_gc_full) |
| 2905 ++_full_young_pause_num; | |
| 2906 else | |
| 2907 ++_partial_young_pause_num; | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2908 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2909 // The young list is laid with the survivor regions from the previous |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2910 // pause are appended to the RHS of the young list, i.e. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2911 // [Newly Young Regions ++ Survivors from last pause]. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2912 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2913 hr = _g1->young_list()->first_survivor_region(); |
| 342 | 2914 while (hr != NULL) { |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2915 assert(hr->is_survivor(), "badly formed young list"); |
|
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
|
2916 hr->set_young(); |
|
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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
|
2917 hr = hr->get_next_young_region(); |
| 342 | 2918 } |
| 2919 | |
|
1394
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2920 // Clear the fields that point to the survivor list - they are |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2921 // all young now. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2922 _g1->young_list()->clear_survivors(); |
|
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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
|
2923 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2924 if (_g1->mark_in_progress()) |
|
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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
|
2925 _g1->concurrent_mark()->register_collection_set_finger(_inc_cset_max_finger); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2926 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2927 _young_cset_length = _inc_cset_young_index; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2928 _collection_set = _inc_cset_head; |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2929 _collection_set_size = _inc_cset_size; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2930 _collection_set_bytes_used_before = _inc_cset_bytes_used_before; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2931 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2932 // For young regions in the collection set, we assume the worst |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2933 // case of complete survival |
|
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
|
2934 max_live_bytes -= _inc_cset_size * HeapRegion::GrainBytes; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2935 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2936 time_remaining_ms -= _inc_cset_predicted_elapsed_time_ms; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2937 predicted_pause_time_ms += _inc_cset_predicted_elapsed_time_ms; |
|
1316cec51b4d
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1391
diff
changeset
|
2938 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2939 // The number of recorded young regions is the incremental |
|
1316cec51b4d
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diff
changeset
|
2940 // collection set's current size |
|
1316cec51b4d
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diff
changeset
|
2941 set_recorded_young_regions(_inc_cset_size); |
|
1316cec51b4d
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1391
diff
changeset
|
2942 set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2943 set_recorded_young_bytes(_inc_cset_recorded_young_bytes); |
|
1316cec51b4d
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parents:
1391
diff
changeset
|
2944 #if PREDICTIONS_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2945 set_predicted_bytes_to_copy(_inc_cset_predicted_bytes_to_copy); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2946 #endif // PREDICTIONS_VERBOSE |
|
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parents:
1391
diff
changeset
|
2947 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2948 if (G1PolicyVerbose > 0) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2949 gclog_or_tty->print_cr(" Added " PTR_FORMAT " Young Regions to CS.", |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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2950 _inc_cset_size); |
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2951 gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", |
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2952 max_live_bytes/K); |
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2953 } |
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2954 |
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2955 assert(_inc_cset_size == _g1->young_list()->length(), "Invariant"); |
| 342 | 2956 |
| 2957 double young_end_time_sec = os::elapsedTime(); | |
| 2958 _recorded_young_cset_choice_time_ms = | |
| 2959 (young_end_time_sec - young_start_time_sec) * 1000.0; | |
| 2960 | |
|
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2961 // We are doing young collections so reset this. |
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2962 non_young_start_time_sec = young_end_time_sec; |
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2963 |
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2964 // Note we can use either _collection_set_size or |
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2965 // _young_cset_length here |
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2966 if (_collection_set_size > 0 && _last_young_gc_full) { |
| 342 | 2967 // don't bother adding more regions... |
| 2968 goto choose_collection_set_end; | |
| 2969 } | |
| 2970 } | |
| 2971 | |
| 2972 if (!in_young_gc_mode() || !full_young_gcs()) { | |
| 2973 bool should_continue = true; | |
| 2974 NumberSeq seq; | |
| 2975 double avg_prediction = 100000000000000000.0; // something very large | |
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2976 |
| 342 | 2977 do { |
| 2978 hr = _collectionSetChooser->getNextMarkedRegion(time_remaining_ms, | |
| 2979 avg_prediction); | |
| 677 | 2980 if (hr != NULL) { |
| 342 | 2981 double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
| 2982 time_remaining_ms -= predicted_time_ms; | |
| 2983 predicted_pause_time_ms += predicted_time_ms; | |
| 2984 add_to_collection_set(hr); | |
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2985 record_non_young_cset_region(hr); |
| 342 | 2986 max_live_bytes -= MIN2(hr->max_live_bytes(), max_live_bytes); |
| 2987 if (G1PolicyVerbose > 0) { | |
| 2988 gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", | |
| 2989 max_live_bytes/K); | |
| 2990 } | |
| 2991 seq.add(predicted_time_ms); | |
| 2992 avg_prediction = seq.avg() + seq.sd(); | |
| 2993 } | |
| 2994 should_continue = | |
| 2995 ( hr != NULL) && | |
| 2996 ( (adaptive_young_list_length()) ? time_remaining_ms > 0.0 | |
| 2997 : _collection_set_size < _young_list_fixed_length ); | |
| 2998 } while (should_continue); | |
| 2999 | |
| 3000 if (!adaptive_young_list_length() && | |
| 3001 _collection_set_size < _young_list_fixed_length) | |
| 3002 _should_revert_to_full_young_gcs = true; | |
| 3003 } | |
| 3004 | |
| 3005 choose_collection_set_end: | |
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3006 stop_incremental_cset_building(); |
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3007 |
| 342 | 3008 count_CS_bytes_used(); |
| 3009 | |
| 3010 end_recording_regions(); | |
| 3011 | |
| 3012 double non_young_end_time_sec = os::elapsedTime(); | |
| 3013 _recorded_non_young_cset_choice_time_ms = | |
| 3014 (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; | |
| 3015 } | |
| 3016 | |
| 3017 void G1CollectorPolicy_BestRegionsFirst::record_full_collection_end() { | |
| 3018 G1CollectorPolicy::record_full_collection_end(); | |
| 3019 _collectionSetChooser->updateAfterFullCollection(); | |
| 3020 } | |
| 3021 | |
| 3022 void G1CollectorPolicy_BestRegionsFirst:: | |
| 3023 expand_if_possible(size_t numRegions) { | |
| 3024 size_t expansion_bytes = numRegions * HeapRegion::GrainBytes; | |
| 3025 _g1->expand(expansion_bytes); | |
| 3026 } | |
| 3027 | |
| 3028 void G1CollectorPolicy_BestRegionsFirst:: | |
| 1707 | 3029 record_collection_pause_end() { |
| 3030 G1CollectorPolicy::record_collection_pause_end(); | |
| 342 | 3031 assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end."); |
| 3032 } |