Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 3867:ff53346271fe
6814390: G1: remove the concept of non-generational G1
Summary: Removed the possibility to turn off generational mode for G1.
Reviewed-by: johnc, ysr, tonyp
| author | brutisso |
|---|---|
| date | Fri, 19 Aug 2011 09:30:59 +0200 |
| parents | f44782f04dd4 |
| children | ae73da50be4b |
| 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 |
| 342 | 139 _n_pauses(0), |
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140 _recent_rs_scan_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
| 342 | 141 _recent_pause_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
| 142 _recent_rs_sizes(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 143 _recent_gc_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 144 _all_pause_times_ms(new NumberSeq()), | |
| 145 _stop_world_start(0.0), | |
| 146 _all_stop_world_times_ms(new NumberSeq()), | |
| 147 _all_yield_times_ms(new NumberSeq()), | |
| 148 | |
| 149 _all_mod_union_times_ms(new NumberSeq()), | |
| 150 | |
| 677 | 151 _summary(new Summary()), |
| 342 | 152 |
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153 #ifndef PRODUCT |
| 342 | 154 _cur_clear_ct_time_ms(0.0), |
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155 _min_clear_cc_time_ms(-1.0), |
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156 _max_clear_cc_time_ms(-1.0), |
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157 _cur_clear_cc_time_ms(0.0), |
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158 _cum_clear_cc_time_ms(0.0), |
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159 _num_cc_clears(0L), |
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160 #endif |
| 342 | 161 |
| 162 _region_num_young(0), | |
| 163 _region_num_tenured(0), | |
| 164 _prev_region_num_young(0), | |
| 165 _prev_region_num_tenured(0), | |
| 166 | |
| 167 _aux_num(10), | |
| 168 _all_aux_times_ms(new NumberSeq[_aux_num]), | |
| 169 _cur_aux_start_times_ms(new double[_aux_num]), | |
| 170 _cur_aux_times_ms(new double[_aux_num]), | |
| 171 _cur_aux_times_set(new bool[_aux_num]), | |
| 172 | |
| 173 _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 174 _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 175 | |
| 176 // <NEW PREDICTION> | |
| 177 | |
| 178 _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 179 _prev_collection_pause_end_ms(0.0), | |
| 180 _pending_card_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 181 _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 182 _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 183 _fully_young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 184 _partially_young_cards_per_entry_ratio_seq( | |
| 185 new TruncatedSeq(TruncatedSeqLength)), | |
| 186 _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 187 _partially_young_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 188 _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 189 _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 190 _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 191 _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 192 _non_young_other_cost_per_region_ms_seq( | |
| 193 new TruncatedSeq(TruncatedSeqLength)), | |
| 194 | |
| 195 _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 196 _scanned_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 197 _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 198 | |
| 751 | 199 _pause_time_target_ms((double) MaxGCPauseMillis), |
| 342 | 200 |
| 201 // </NEW PREDICTION> | |
| 202 | |
| 203 _full_young_gcs(true), | |
| 204 _full_young_pause_num(0), | |
| 205 _partial_young_pause_num(0), | |
| 206 | |
| 207 _during_marking(false), | |
| 208 _in_marking_window(false), | |
| 209 _in_marking_window_im(false), | |
| 210 | |
| 211 _known_garbage_ratio(0.0), | |
| 212 _known_garbage_bytes(0), | |
| 213 | |
| 214 _young_gc_eff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 215 | |
| 216 _recent_prev_end_times_for_all_gcs_sec(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 217 | |
| 218 _recent_CS_bytes_used_before(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 219 _recent_CS_bytes_surviving(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 220 | |
| 221 _recent_avg_pause_time_ratio(0.0), | |
| 222 _num_markings(0), | |
| 223 _n_marks(0), | |
| 224 _n_pauses_at_mark_end(0), | |
| 225 | |
| 226 _all_full_gc_times_ms(new NumberSeq()), | |
| 227 | |
| 228 // G1PausesBtwnConcMark defaults to -1 | |
| 229 // so the hack is to do the cast QQQ FIXME | |
| 230 _pauses_btwn_concurrent_mark((size_t)G1PausesBtwnConcMark), | |
| 231 _n_marks_since_last_pause(0), | |
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232 _initiate_conc_mark_if_possible(false), |
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233 _during_initial_mark_pause(false), |
| 342 | 234 _should_revert_to_full_young_gcs(false), |
| 235 _last_full_young_gc(false), | |
| 236 | |
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237 _eden_bytes_before_gc(0), |
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238 _survivor_bytes_before_gc(0), |
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239 _capacity_before_gc(0), |
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240 |
| 342 | 241 _prev_collection_pause_used_at_end_bytes(0), |
| 242 | |
| 243 _collection_set(NULL), | |
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244 _collection_set_size(0), |
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245 _collection_set_bytes_used_before(0), |
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246 |
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247 // Incremental CSet attributes |
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248 _inc_cset_build_state(Inactive), |
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249 _inc_cset_head(NULL), |
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250 _inc_cset_tail(NULL), |
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251 _inc_cset_size(0), |
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252 _inc_cset_young_index(0), |
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253 _inc_cset_bytes_used_before(0), |
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254 _inc_cset_max_finger(NULL), |
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255 _inc_cset_recorded_young_bytes(0), |
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256 _inc_cset_recorded_rs_lengths(0), |
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257 _inc_cset_predicted_elapsed_time_ms(0.0), |
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258 _inc_cset_predicted_bytes_to_copy(0), |
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259 |
| 342 | 260 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
| 261 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 262 #endif // _MSC_VER | |
| 263 | |
| 264 _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", | |
| 265 G1YoungSurvRateNumRegionsSummary)), | |
| 266 _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", | |
| 545 | 267 G1YoungSurvRateNumRegionsSummary)), |
| 342 | 268 // add here any more surv rate groups |
| 545 | 269 _recorded_survivor_regions(0), |
| 270 _recorded_survivor_head(NULL), | |
| 271 _recorded_survivor_tail(NULL), | |
| 1356 | 272 _survivors_age_table(true), |
| 273 | |
| 274 _gc_overhead_perc(0.0) | |
| 545 | 275 |
| 342 | 276 { |
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277 // Set up the region size and associated fields. Given that the |
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278 // policy is created before the heap, we have to set this up here, |
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279 // so it's done as soon as possible. |
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280 HeapRegion::setup_heap_region_size(Arguments::min_heap_size()); |
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281 HeapRegionRemSet::setup_remset_size(); |
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282 |
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283 // Verify PLAB sizes |
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284 const uint region_size = HeapRegion::GrainWords; |
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285 if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
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286 char buffer[128]; |
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287 jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most %u", |
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288 OldPLABSize > region_size ? "Old" : "Young", region_size); |
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289 vm_exit_during_initialization(buffer); |
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290 } |
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291 |
| 342 | 292 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
| 293 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
| 294 | |
| 1611 | 295 _par_last_gc_worker_start_times_ms = new double[_parallel_gc_threads]; |
| 342 | 296 _par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads]; |
| 297 _par_last_mark_stack_scan_times_ms = new double[_parallel_gc_threads]; | |
| 298 | |
| 299 _par_last_update_rs_times_ms = new double[_parallel_gc_threads]; | |
| 300 _par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; | |
| 301 | |
| 302 _par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; | |
| 303 | |
| 304 _par_last_obj_copy_times_ms = new double[_parallel_gc_threads]; | |
| 305 | |
| 306 _par_last_termination_times_ms = new double[_parallel_gc_threads]; | |
| 1611 | 307 _par_last_termination_attempts = new double[_parallel_gc_threads]; |
| 308 _par_last_gc_worker_end_times_ms = new double[_parallel_gc_threads]; | |
| 2430 | 309 _par_last_gc_worker_times_ms = new double[_parallel_gc_threads]; |
| 342 | 310 |
| 311 // start conservatively | |
| 751 | 312 _expensive_region_limit_ms = 0.5 * (double) MaxGCPauseMillis; |
| 342 | 313 |
| 314 // <NEW PREDICTION> | |
| 315 | |
| 316 int index; | |
| 317 if (ParallelGCThreads == 0) | |
| 318 index = 0; | |
| 319 else if (ParallelGCThreads > 8) | |
| 320 index = 7; | |
| 321 else | |
| 322 index = ParallelGCThreads - 1; | |
| 323 | |
| 324 _pending_card_diff_seq->add(0.0); | |
| 325 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
| 326 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
| 327 _fully_young_cards_per_entry_ratio_seq->add( | |
| 328 fully_young_cards_per_entry_ratio_defaults[index]); | |
| 329 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); | |
| 330 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
| 331 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
| 332 _young_other_cost_per_region_ms_seq->add( | |
| 333 young_other_cost_per_region_ms_defaults[index]); | |
| 334 _non_young_other_cost_per_region_ms_seq->add( | |
| 335 non_young_other_cost_per_region_ms_defaults[index]); | |
| 336 | |
| 337 // </NEW PREDICTION> | |
| 338 | |
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339 // Below, we might need to calculate the pause time target based on |
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340 // the pause interval. When we do so we are going to give G1 maximum |
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341 // flexibility and allow it to do pauses when it needs to. So, we'll |
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342 // arrange that the pause interval to be pause time target + 1 to |
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343 // ensure that a) the pause time target is maximized with respect to |
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344 // the pause interval and b) we maintain the invariant that pause |
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345 // time target < pause interval. If the user does not want this |
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346 // maximum flexibility, they will have to set the pause interval |
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347 // explicitly. |
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348 |
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349 // First make sure that, if either parameter is set, its value is |
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350 // reasonable. |
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351 if (!FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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352 if (MaxGCPauseMillis < 1) { |
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353 vm_exit_during_initialization("MaxGCPauseMillis should be " |
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354 "greater than 0"); |
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355 } |
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356 } |
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357 if (!FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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358 if (GCPauseIntervalMillis < 1) { |
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359 vm_exit_during_initialization("GCPauseIntervalMillis should be " |
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360 "greater than 0"); |
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361 } |
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362 } |
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363 |
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364 // Then, if the pause time target parameter was not set, set it to |
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365 // the default value. |
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366 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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367 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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368 // The default pause time target in G1 is 200ms |
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369 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); |
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370 } else { |
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371 // We do not allow the pause interval to be set without the |
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372 // pause time target |
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373 vm_exit_during_initialization("GCPauseIntervalMillis cannot be set " |
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374 "without setting MaxGCPauseMillis"); |
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375 } |
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376 } |
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377 |
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378 // Then, if the interval parameter was not set, set it according to |
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379 // the pause time target (this will also deal with the case when the |
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380 // pause time target is the default value). |
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381 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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382 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); |
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383 } |
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384 |
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385 // Finally, make sure that the two parameters are consistent. |
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386 if (MaxGCPauseMillis >= GCPauseIntervalMillis) { |
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387 char buffer[256]; |
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388 jio_snprintf(buffer, 256, |
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389 "MaxGCPauseMillis (%u) should be less than " |
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390 "GCPauseIntervalMillis (%u)", |
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391 MaxGCPauseMillis, GCPauseIntervalMillis); |
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392 vm_exit_during_initialization(buffer); |
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393 } |
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394 |
| 751 | 395 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; |
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396 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
| 342 | 397 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); |
| 751 | 398 _sigma = (double) G1ConfidencePercent / 100.0; |
| 342 | 399 |
| 400 // start conservatively (around 50ms is about right) | |
| 401 _concurrent_mark_remark_times_ms->add(0.05); | |
| 402 _concurrent_mark_cleanup_times_ms->add(0.20); | |
| 403 _tenuring_threshold = MaxTenuringThreshold; | |
| 404 | |
| 1282 | 405 // if G1FixedSurvivorSpaceSize is 0 which means the size is not |
| 406 // fixed, then _max_survivor_regions will be calculated at | |
|
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407 // calculate_young_list_target_length during initialization |
| 1282 | 408 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
| 545 | 409 |
| 1356 | 410 assert(GCTimeRatio > 0, |
| 411 "we should have set it to a default value set_g1_gc_flags() " | |
| 412 "if a user set it to 0"); | |
| 413 _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); | |
| 414 | |
| 342 | 415 initialize_all(); |
| 416 } | |
| 417 | |
| 418 // Increment "i", mod "len" | |
| 419 static void inc_mod(int& i, int len) { | |
| 420 i++; if (i == len) i = 0; | |
| 421 } | |
| 422 | |
| 423 void G1CollectorPolicy::initialize_flags() { | |
| 424 set_min_alignment(HeapRegion::GrainBytes); | |
| 425 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
|
547
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426 if (SurvivorRatio < 1) { |
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427 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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428 } |
| 342 | 429 CollectorPolicy::initialize_flags(); |
| 430 } | |
| 431 | |
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432 // The easiest way to deal with the parsing of the NewSize / |
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433 // MaxNewSize / etc. parameteres is to re-use the code in the |
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434 // TwoGenerationCollectorPolicy class. This is similar to what |
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435 // ParallelScavenge does with its GenerationSizer class (see |
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436 // ParallelScavengeHeap::initialize()). We might change this in the |
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437 // future, but it's a good start. |
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438 class G1YoungGenSizer : public TwoGenerationCollectorPolicy { |
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439 size_t size_to_region_num(size_t byte_size) { |
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440 return MAX2((size_t) 1, byte_size / HeapRegion::GrainBytes); |
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441 } |
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442 |
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443 public: |
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444 G1YoungGenSizer() { |
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445 initialize_flags(); |
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446 initialize_size_info(); |
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447 } |
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448 |
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449 size_t min_young_region_num() { |
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450 return size_to_region_num(_min_gen0_size); |
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451 } |
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452 size_t initial_young_region_num() { |
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453 return size_to_region_num(_initial_gen0_size); |
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454 } |
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455 size_t max_young_region_num() { |
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456 return size_to_region_num(_max_gen0_size); |
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457 } |
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458 }; |
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459 |
| 342 | 460 void G1CollectorPolicy::init() { |
| 461 // Set aside an initial future to_space. | |
| 462 _g1 = G1CollectedHeap::heap(); | |
| 463 | |
| 464 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
| 465 | |
| 545 | 466 initialize_gc_policy_counters(); |
| 467 | |
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468 G1YoungGenSizer sizer; |
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469 size_t initial_region_num = sizer.initial_young_region_num(); |
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470 |
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471 if (UseAdaptiveSizePolicy) { |
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472 set_adaptive_young_list_length(true); |
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473 _young_list_fixed_length = 0; |
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474 } else { |
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475 set_adaptive_young_list_length(false); |
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476 _young_list_fixed_length = initial_region_num; |
| 342 | 477 } |
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478 _free_regions_at_end_of_collection = _g1->free_regions(); |
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479 calculate_young_list_min_length(); |
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480 guarantee( _young_list_min_length == 0, "invariant, not enough info" ); |
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481 calculate_young_list_target_length(); |
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482 |
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483 // We may immediately start allocating regions and placing them on the |
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484 // collection set list. Initialize the per-collection set info |
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485 start_incremental_cset_building(); |
| 342 | 486 } |
| 487 | |
| 545 | 488 // Create the jstat counters for the policy. |
| 489 void G1CollectorPolicy::initialize_gc_policy_counters() | |
| 490 { | |
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491 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 3); |
| 545 | 492 } |
| 493 | |
| 342 | 494 void G1CollectorPolicy::calculate_young_list_min_length() { |
| 495 _young_list_min_length = 0; | |
| 496 | |
| 497 if (!adaptive_young_list_length()) | |
| 498 return; | |
| 499 | |
| 500 if (_alloc_rate_ms_seq->num() > 3) { | |
| 501 double now_sec = os::elapsedTime(); | |
| 502 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; | |
| 503 double alloc_rate_ms = predict_alloc_rate_ms(); | |
| 1973 | 504 size_t min_regions = (size_t) ceil(alloc_rate_ms * when_ms); |
| 505 size_t current_region_num = _g1->young_list()->length(); | |
| 342 | 506 _young_list_min_length = min_regions + current_region_num; |
| 507 } | |
| 508 } | |
| 509 | |
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510 void G1CollectorPolicy::calculate_young_list_target_length() { |
| 342 | 511 if (adaptive_young_list_length()) { |
| 512 size_t rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); | |
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513 calculate_young_list_target_length(rs_lengths); |
| 342 | 514 } else { |
| 515 if (full_young_gcs()) | |
| 516 _young_list_target_length = _young_list_fixed_length; | |
| 517 else | |
| 518 _young_list_target_length = _young_list_fixed_length / 2; | |
| 519 } | |
| 1973 | 520 |
| 521 // Make sure we allow the application to allocate at least one | |
| 522 // region before we need to do a collection again. | |
| 523 size_t min_length = _g1->young_list()->length() + 1; | |
| 524 _young_list_target_length = MAX2(_young_list_target_length, min_length); | |
|
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525 calculate_max_gc_locker_expansion(); |
| 545 | 526 calculate_survivors_policy(); |
| 342 | 527 } |
| 528 | |
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529 void G1CollectorPolicy::calculate_young_list_target_length(size_t rs_lengths) { |
| 342 | 530 guarantee( adaptive_young_list_length(), "pre-condition" ); |
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531 guarantee( !_in_marking_window || !_last_full_young_gc, "invariant" ); |
| 342 | 532 |
| 533 double start_time_sec = os::elapsedTime(); | |
| 1282 | 534 size_t min_reserve_perc = MAX2((size_t)2, (size_t)G1ReservePercent); |
| 342 | 535 min_reserve_perc = MIN2((size_t) 50, min_reserve_perc); |
| 536 size_t reserve_regions = | |
| 537 (size_t) ((double) min_reserve_perc * (double) _g1->n_regions() / 100.0); | |
| 538 | |
| 539 if (full_young_gcs() && _free_regions_at_end_of_collection > 0) { | |
| 540 // we are in fully-young mode and there are free regions in the heap | |
| 541 | |
| 545 | 542 double survivor_regions_evac_time = |
| 543 predict_survivor_regions_evac_time(); | |
| 544 | |
| 342 | 545 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
| 546 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); | |
| 547 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); | |
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548 size_t scanned_cards = predict_young_card_num(adj_rs_lengths); |
| 545 | 549 double base_time_ms = predict_base_elapsed_time_ms(pending_cards, scanned_cards) |
| 550 + survivor_regions_evac_time; | |
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551 |
| 342 | 552 // the result |
| 553 size_t final_young_length = 0; | |
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554 |
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555 size_t init_free_regions = |
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556 MAX2((size_t)0, _free_regions_at_end_of_collection - reserve_regions); |
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557 |
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558 // if we're still under the pause target... |
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559 if (base_time_ms <= target_pause_time_ms) { |
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560 // We make sure that the shortest young length that makes sense |
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561 // fits within the target pause time. |
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562 size_t min_young_length = 1; |
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563 |
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564 if (predict_will_fit(min_young_length, base_time_ms, |
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565 init_free_regions, target_pause_time_ms)) { |
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566 // The shortest young length will fit within the target pause time; |
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567 // we'll now check whether the absolute maximum number of young |
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568 // regions will fit in the target pause time. If not, we'll do |
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569 // a binary search between min_young_length and max_young_length |
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570 size_t abs_max_young_length = _free_regions_at_end_of_collection - 1; |
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571 size_t max_young_length = abs_max_young_length; |
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572 |
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573 if (max_young_length > min_young_length) { |
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574 // Let's check if the initial max young length will fit within the |
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575 // target pause. If so then there is no need to search for a maximal |
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576 // young length - we'll return the initial maximum |
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577 |
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578 if (predict_will_fit(max_young_length, base_time_ms, |
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579 init_free_regions, target_pause_time_ms)) { |
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580 // The maximum young length will satisfy the target pause time. |
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581 // We are done so set min young length to this maximum length. |
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582 // The code after the loop will then set final_young_length using |
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583 // the value cached in the minimum length. |
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584 min_young_length = max_young_length; |
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585 } else { |
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586 // The maximum possible number of young regions will not fit within |
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587 // the target pause time so let's search.... |
| 342 | 588 |
| 589 size_t diff = (max_young_length - min_young_length) / 2; | |
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590 max_young_length = min_young_length + diff; |
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591 |
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592 while (max_young_length > min_young_length) { |
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593 if (predict_will_fit(max_young_length, base_time_ms, |
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594 init_free_regions, target_pause_time_ms)) { |
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595 |
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596 // The current max young length will fit within the target |
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597 // pause time. Note we do not exit the loop here. By setting |
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598 // min = max, and then increasing the max below means that |
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599 // we will continue searching for an upper bound in the |
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600 // range [max..max+diff] |
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601 min_young_length = max_young_length; |
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602 } |
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603 diff = (max_young_length - min_young_length) / 2; |
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604 max_young_length = min_young_length + diff; |
| 342 | 605 } |
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606 // the above loop found a maximal young length that will fit |
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607 // within the target pause time. |
| 342 | 608 } |
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609 assert(min_young_length <= abs_max_young_length, "just checking"); |
| 342 | 610 } |
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611 final_young_length = min_young_length; |
| 342 | 612 } |
| 613 } | |
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614 // and we're done! |
| 342 | 615 |
| 616 // we should have at least one region in the target young length | |
| 545 | 617 _young_list_target_length = |
| 1973 | 618 final_young_length + _recorded_survivor_regions; |
| 342 | 619 |
| 620 // let's keep an eye of how long we spend on this calculation | |
| 621 // right now, I assume that we'll print it when we need it; we | |
| 622 // should really adde it to the breakdown of a pause | |
| 623 double end_time_sec = os::elapsedTime(); | |
| 624 double elapsed_time_ms = (end_time_sec - start_time_sec) * 1000.0; | |
| 625 | |
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626 #ifdef TRACE_CALC_YOUNG_LENGTH |
| 342 | 627 // leave this in for debugging, just in case |
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628 gclog_or_tty->print_cr("target = %1.1lf ms, young = " SIZE_FORMAT ", " |
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629 "elapsed %1.2lf ms, (%s%s) " SIZE_FORMAT SIZE_FORMAT, |
| 342 | 630 target_pause_time_ms, |
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631 _young_list_target_length |
| 342 | 632 elapsed_time_ms, |
| 633 full_young_gcs() ? "full" : "partial", | |
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634 during_initial_mark_pause() ? " i-m" : "", |
| 545 | 635 _in_marking_window, |
| 636 _in_marking_window_im); | |
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637 #endif // TRACE_CALC_YOUNG_LENGTH |
| 342 | 638 |
| 639 if (_young_list_target_length < _young_list_min_length) { | |
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640 // bummer; this means that, if we do a pause when the maximal |
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641 // length dictates, we'll violate the pause spacing target (the |
| 342 | 642 // min length was calculate based on the application's current |
| 643 // alloc rate); | |
| 644 | |
| 645 // so, we have to bite the bullet, and allocate the minimum | |
| 646 // number. We'll violate our target, but we just can't meet it. | |
| 647 | |
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648 #ifdef TRACE_CALC_YOUNG_LENGTH |
| 342 | 649 // leave this in for debugging, just in case |
| 650 gclog_or_tty->print_cr("adjusted target length from " | |
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651 SIZE_FORMAT " to " SIZE_FORMAT, |
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652 _young_list_target_length, _young_list_min_length); |
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653 #endif // TRACE_CALC_YOUNG_LENGTH |
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654 |
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655 _young_list_target_length = _young_list_min_length; |
| 342 | 656 } |
| 657 } else { | |
| 658 // we are in a partially-young mode or we've run out of regions (due | |
| 659 // to evacuation failure) | |
| 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("(partial) setting target to " SIZE_FORMAT | |
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664 _young_list_min_length); |
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665 #endif // TRACE_CALC_YOUNG_LENGTH |
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666 // we'll do the pause as soon as possible by choosing the minimum |
| 1973 | 667 _young_list_target_length = _young_list_min_length; |
| 342 | 668 } |
| 669 | |
| 670 _rs_lengths_prediction = rs_lengths; | |
| 671 } | |
| 672 | |
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673 // This is used by: calculate_young_list_target_length(rs_length). It |
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674 // returns true iff: |
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675 // the predicted pause time for the given young list will not overflow |
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676 // the target pause time |
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677 // and: |
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678 // the predicted amount of surviving data will not overflow the |
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679 // the amount of free space available for survivor regions. |
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680 // |
| 342 | 681 bool |
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682 G1CollectorPolicy::predict_will_fit(size_t young_length, |
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683 double base_time_ms, |
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684 size_t init_free_regions, |
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685 double target_pause_time_ms) { |
| 342 | 686 |
| 687 if (young_length >= init_free_regions) | |
| 688 // end condition 1: not enough space for the young regions | |
| 689 return false; | |
| 690 | |
| 691 double accum_surv_rate_adj = 0.0; | |
| 692 double accum_surv_rate = | |
| 693 accum_yg_surv_rate_pred((int)(young_length - 1)) - accum_surv_rate_adj; | |
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694 |
| 342 | 695 size_t bytes_to_copy = |
| 696 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); | |
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697 |
| 342 | 698 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
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699 |
| 342 | 700 double young_other_time_ms = |
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701 predict_young_other_time_ms(young_length); |
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702 |
| 342 | 703 double pause_time_ms = |
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704 base_time_ms + copy_time_ms + young_other_time_ms; |
| 342 | 705 |
| 706 if (pause_time_ms > target_pause_time_ms) | |
| 707 // end condition 2: over the target pause time | |
| 708 return false; | |
| 709 | |
| 710 size_t free_bytes = | |
| 711 (init_free_regions - young_length) * HeapRegion::GrainBytes; | |
| 712 | |
| 713 if ((2.0 + sigma()) * (double) bytes_to_copy > (double) free_bytes) | |
| 714 // end condition 3: out of to-space (conservatively) | |
| 715 return false; | |
| 716 | |
| 717 // success! | |
| 718 return true; | |
| 719 } | |
| 720 | |
| 545 | 721 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
| 722 double survivor_regions_evac_time = 0.0; | |
| 723 for (HeapRegion * r = _recorded_survivor_head; | |
| 724 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
| 725 r = r->get_next_young_region()) { | |
| 726 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); | |
| 727 } | |
| 728 return survivor_regions_evac_time; | |
| 729 } | |
| 730 | |
| 342 | 731 void G1CollectorPolicy::check_prediction_validity() { |
| 732 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); | |
| 733 | |
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734 size_t rs_lengths = _g1->young_list()->sampled_rs_lengths(); |
| 342 | 735 if (rs_lengths > _rs_lengths_prediction) { |
| 736 // add 10% to avoid having to recalculate often | |
| 737 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
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738 calculate_young_list_target_length(rs_lengths_prediction); |
| 342 | 739 } |
| 740 } | |
| 741 | |
| 742 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, | |
| 743 bool is_tlab, | |
| 744 bool* gc_overhead_limit_was_exceeded) { | |
| 745 guarantee(false, "Not using this policy feature yet."); | |
| 746 return NULL; | |
| 747 } | |
| 748 | |
| 749 // This method controls how a collector handles one or more | |
| 750 // of its generations being fully allocated. | |
| 751 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
| 752 bool is_tlab) { | |
| 753 guarantee(false, "Not using this policy feature yet."); | |
| 754 return NULL; | |
| 755 } | |
| 756 | |
| 757 | |
| 758 #ifndef PRODUCT | |
| 759 bool G1CollectorPolicy::verify_young_ages() { | |
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760 HeapRegion* head = _g1->young_list()->first_region(); |
| 342 | 761 return |
| 762 verify_young_ages(head, _short_lived_surv_rate_group); | |
| 763 // also call verify_young_ages on any additional surv rate groups | |
| 764 } | |
| 765 | |
| 766 bool | |
| 767 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
| 768 SurvRateGroup *surv_rate_group) { | |
| 769 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
| 770 | |
| 771 const char* name = surv_rate_group->name(); | |
| 772 bool ret = true; | |
| 773 int prev_age = -1; | |
| 774 | |
| 775 for (HeapRegion* curr = head; | |
| 776 curr != NULL; | |
| 777 curr = curr->get_next_young_region()) { | |
| 778 SurvRateGroup* group = curr->surv_rate_group(); | |
| 779 if (group == NULL && !curr->is_survivor()) { | |
| 780 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
| 781 ret = false; | |
| 782 } | |
| 783 | |
| 784 if (surv_rate_group == group) { | |
| 785 int age = curr->age_in_surv_rate_group(); | |
| 786 | |
| 787 if (age < 0) { | |
| 788 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
| 789 ret = false; | |
| 790 } | |
| 791 | |
| 792 if (age <= prev_age) { | |
| 793 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
| 794 "(%d, %d)", name, age, prev_age); | |
| 795 ret = false; | |
| 796 } | |
| 797 prev_age = age; | |
| 798 } | |
| 799 } | |
| 800 | |
| 801 return ret; | |
| 802 } | |
| 803 #endif // PRODUCT | |
| 804 | |
| 805 void G1CollectorPolicy::record_full_collection_start() { | |
| 806 _cur_collection_start_sec = os::elapsedTime(); | |
| 807 // Release the future to-space so that it is available for compaction into. | |
| 808 _g1->set_full_collection(); | |
| 809 } | |
| 810 | |
| 811 void G1CollectorPolicy::record_full_collection_end() { | |
| 812 // Consider this like a collection pause for the purposes of allocation | |
| 813 // since last pause. | |
| 814 double end_sec = os::elapsedTime(); | |
| 815 double full_gc_time_sec = end_sec - _cur_collection_start_sec; | |
| 816 double full_gc_time_ms = full_gc_time_sec * 1000.0; | |
| 817 | |
| 818 _all_full_gc_times_ms->add(full_gc_time_ms); | |
| 819 | |
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820 update_recent_gc_times(end_sec, full_gc_time_ms); |
| 342 | 821 |
| 822 _g1->clear_full_collection(); | |
| 823 | |
| 824 // "Nuke" the heuristics that control the fully/partially young GC | |
| 825 // transitions and make sure we start with fully young GCs after the | |
| 826 // Full GC. | |
| 827 set_full_young_gcs(true); | |
| 828 _last_full_young_gc = false; | |
| 829 _should_revert_to_full_young_gcs = false; | |
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830 clear_initiate_conc_mark_if_possible(); |
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831 clear_during_initial_mark_pause(); |
| 342 | 832 _known_garbage_bytes = 0; |
| 833 _known_garbage_ratio = 0.0; | |
| 834 _in_marking_window = false; | |
| 835 _in_marking_window_im = false; | |
| 836 | |
| 837 _short_lived_surv_rate_group->start_adding_regions(); | |
| 838 // also call this on any additional surv rate groups | |
| 839 | |
| 545 | 840 record_survivor_regions(0, NULL, NULL); |
| 841 | |
| 342 | 842 _prev_region_num_young = _region_num_young; |
| 843 _prev_region_num_tenured = _region_num_tenured; | |
| 844 | |
| 845 _free_regions_at_end_of_collection = _g1->free_regions(); | |
| 545 | 846 // Reset survivors SurvRateGroup. |
| 847 _survivor_surv_rate_group->reset(); | |
| 342 | 848 calculate_young_list_min_length(); |
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849 calculate_young_list_target_length(); |
| 1973 | 850 } |
| 342 | 851 |
| 852 void G1CollectorPolicy::record_stop_world_start() { | |
| 853 _stop_world_start = os::elapsedTime(); | |
| 854 } | |
| 855 | |
| 856 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, | |
| 857 size_t start_used) { | |
| 858 if (PrintGCDetails) { | |
| 859 gclog_or_tty->stamp(PrintGCTimeStamps); | |
| 860 gclog_or_tty->print("[GC pause"); | |
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861 gclog_or_tty->print(" (%s)", full_young_gcs() ? "young" : "partial"); |
| 342 | 862 } |
| 863 | |
| 1973 | 864 assert(_g1->used() == _g1->recalculate_used(), |
| 865 err_msg("sanity, used: "SIZE_FORMAT" recalculate_used: "SIZE_FORMAT, | |
| 866 _g1->used(), _g1->recalculate_used())); | |
| 342 | 867 |
| 868 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
| 869 _all_stop_world_times_ms->add(s_w_t_ms); | |
| 870 _stop_world_start = 0.0; | |
| 871 | |
| 872 _cur_collection_start_sec = start_time_sec; | |
| 873 _cur_collection_pause_used_at_start_bytes = start_used; | |
| 874 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); | |
| 875 _pending_cards = _g1->pending_card_num(); | |
| 876 _max_pending_cards = _g1->max_pending_card_num(); | |
| 877 | |
| 878 _bytes_in_collection_set_before_gc = 0; | |
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879 _bytes_copied_during_gc = 0; |
| 342 | 880 |
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881 YoungList* young_list = _g1->young_list(); |
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882 _eden_bytes_before_gc = young_list->eden_used_bytes(); |
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883 _survivor_bytes_before_gc = young_list->survivor_used_bytes(); |
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884 _capacity_before_gc = _g1->capacity(); |
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885 |
| 342 | 886 #ifdef DEBUG |
| 887 // initialise these to something well known so that we can spot | |
| 888 // if they are not set properly | |
| 889 | |
| 890 for (int i = 0; i < _parallel_gc_threads; ++i) { | |
| 1611 | 891 _par_last_gc_worker_start_times_ms[i] = -1234.0; |
| 892 _par_last_ext_root_scan_times_ms[i] = -1234.0; | |
| 893 _par_last_mark_stack_scan_times_ms[i] = -1234.0; | |
| 894 _par_last_update_rs_times_ms[i] = -1234.0; | |
| 895 _par_last_update_rs_processed_buffers[i] = -1234.0; | |
| 896 _par_last_scan_rs_times_ms[i] = -1234.0; | |
| 897 _par_last_obj_copy_times_ms[i] = -1234.0; | |
| 898 _par_last_termination_times_ms[i] = -1234.0; | |
| 899 _par_last_termination_attempts[i] = -1234.0; | |
| 900 _par_last_gc_worker_end_times_ms[i] = -1234.0; | |
| 2430 | 901 _par_last_gc_worker_times_ms[i] = -1234.0; |
| 342 | 902 } |
| 903 #endif | |
| 904 | |
| 905 for (int i = 0; i < _aux_num; ++i) { | |
| 906 _cur_aux_times_ms[i] = 0.0; | |
| 907 _cur_aux_times_set[i] = false; | |
| 908 } | |
| 909 | |
| 910 _satb_drain_time_set = false; | |
| 911 _last_satb_drain_processed_buffers = -1; | |
| 912 | |
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913 _last_young_gc_full = false; |
| 342 | 914 |
| 915 // do that for any other surv rate groups | |
| 916 _short_lived_surv_rate_group->stop_adding_regions(); | |
| 1282 | 917 _survivors_age_table.clear(); |
| 545 | 918 |
| 342 | 919 assert( verify_young_ages(), "region age verification" ); |
| 920 } | |
| 921 | |
| 922 void G1CollectorPolicy::record_mark_closure_time(double mark_closure_time_ms) { | |
| 923 _mark_closure_time_ms = mark_closure_time_ms; | |
| 924 } | |
| 925 | |
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926 void G1CollectorPolicy::record_concurrent_mark_init_end(double |
| 342 | 927 mark_init_elapsed_time_ms) { |
| 928 _during_marking = true; | |
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929 assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
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930 clear_during_initial_mark_pause(); |
| 342 | 931 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
| 932 } | |
| 933 | |
| 934 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
| 935 _mark_remark_start_sec = os::elapsedTime(); | |
| 936 _during_marking = false; | |
| 937 } | |
| 938 | |
| 939 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
| 940 double end_time_sec = os::elapsedTime(); | |
| 941 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
| 942 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
| 943 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
| 944 _prev_collection_pause_end_ms += elapsed_time_ms; | |
| 945 | |
| 946 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
| 947 } | |
| 948 | |
| 949 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
| 950 _mark_cleanup_start_sec = os::elapsedTime(); | |
| 951 } | |
| 952 | |
| 953 void | |
| 954 G1CollectorPolicy::record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
| 955 size_t max_live_bytes) { | |
| 956 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
| 957 record_concurrent_mark_cleanup_end_work2(); | |
| 958 } | |
| 959 | |
| 960 void | |
| 961 G1CollectorPolicy:: | |
| 962 record_concurrent_mark_cleanup_end_work1(size_t freed_bytes, | |
| 963 size_t max_live_bytes) { | |
| 964 if (_n_marks < 2) _n_marks++; | |
| 965 if (G1PolicyVerbose > 0) | |
| 966 gclog_or_tty->print_cr("At end of marking, max_live is " SIZE_FORMAT " MB " | |
| 967 " (of " SIZE_FORMAT " MB heap).", | |
| 968 max_live_bytes/M, _g1->capacity()/M); | |
| 969 } | |
| 970 | |
| 971 // The important thing about this is that it includes "os::elapsedTime". | |
| 972 void G1CollectorPolicy::record_concurrent_mark_cleanup_end_work2() { | |
| 973 double end_time_sec = os::elapsedTime(); | |
| 974 double elapsed_time_ms = (end_time_sec - _mark_cleanup_start_sec)*1000.0; | |
| 975 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
| 976 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
| 977 _prev_collection_pause_end_ms += elapsed_time_ms; | |
| 978 | |
| 979 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_time_sec, true); | |
| 980 | |
| 981 _num_markings++; | |
| 982 | |
| 983 // We did a marking, so reset the "since_last_mark" variables. | |
| 984 double considerConcMarkCost = 1.0; | |
| 985 // If there are available processors, concurrent activity is free... | |
| 986 if (Threads::number_of_non_daemon_threads() * 2 < | |
| 987 os::active_processor_count()) { | |
| 988 considerConcMarkCost = 0.0; | |
| 989 } | |
| 990 _n_pauses_at_mark_end = _n_pauses; | |
| 991 _n_marks_since_last_pause++; | |
| 992 } | |
| 993 | |
| 994 void | |
| 995 G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { | |
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996 _should_revert_to_full_young_gcs = false; |
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997 _last_full_young_gc = true; |
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998 _in_marking_window = false; |
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999 if (adaptive_young_list_length()) |
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1000 calculate_young_list_target_length(); |
| 342 | 1001 } |
| 1002 | |
| 1003 void G1CollectorPolicy::record_concurrent_pause() { | |
| 1004 if (_stop_world_start > 0.0) { | |
| 1005 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
| 1006 _all_yield_times_ms->add(yield_ms); | |
| 1007 } | |
| 1008 } | |
| 1009 | |
| 1010 void G1CollectorPolicy::record_concurrent_pause_end() { | |
| 1011 } | |
| 1012 | |
| 1013 template<class T> | |
| 1014 T sum_of(T* sum_arr, int start, int n, int N) { | |
| 1015 T sum = (T)0; | |
| 1016 for (int i = 0; i < n; i++) { | |
| 1017 int j = (start + i) % N; | |
| 1018 sum += sum_arr[j]; | |
| 1019 } | |
| 1020 return sum; | |
| 1021 } | |
| 1022 | |
| 1611 | 1023 void G1CollectorPolicy::print_par_stats(int level, |
| 1024 const char* str, | |
| 2430 | 1025 double* data) { |
| 342 | 1026 double min = data[0], max = data[0]; |
| 1027 double total = 0.0; | |
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1028 LineBuffer buf(level); |
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1029 buf.append("[%s (ms):", str); |
| 342 | 1030 for (uint i = 0; i < ParallelGCThreads; ++i) { |
| 1031 double val = data[i]; | |
| 1032 if (val < min) | |
| 1033 min = val; | |
| 1034 if (val > max) | |
| 1035 max = val; | |
| 1036 total += val; | |
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1037 buf.append(" %3.1lf", val); |
| 342 | 1038 } |
| 2430 | 1039 buf.append_and_print_cr(""); |
| 1040 double avg = total / (double) ParallelGCThreads; | |
| 1041 buf.append_and_print_cr(" Avg: %5.1lf, Min: %5.1lf, Max: %5.1lf, Diff: %5.1lf]", | |
| 1042 avg, min, max, max - min); | |
| 342 | 1043 } |
| 1044 | |
| 1611 | 1045 void G1CollectorPolicy::print_par_sizes(int level, |
| 1046 const char* str, | |
| 2430 | 1047 double* data) { |
| 342 | 1048 double min = data[0], max = data[0]; |
| 1049 double total = 0.0; | |
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1050 LineBuffer buf(level); |
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1051 buf.append("[%s :", str); |
| 342 | 1052 for (uint i = 0; i < ParallelGCThreads; ++i) { |
| 1053 double val = data[i]; | |
| 1054 if (val < min) | |
| 1055 min = val; | |
| 1056 if (val > max) | |
| 1057 max = val; | |
| 1058 total += val; | |
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1059 buf.append(" %d", (int) val); |
| 342 | 1060 } |
| 2430 | 1061 buf.append_and_print_cr(""); |
| 1062 double avg = total / (double) ParallelGCThreads; | |
| 1063 buf.append_and_print_cr(" Sum: %d, Avg: %d, Min: %d, Max: %d, Diff: %d]", | |
| 1064 (int)total, (int)avg, (int)min, (int)max, (int)max - (int)min); | |
| 342 | 1065 } |
| 1066 | |
| 1067 void G1CollectorPolicy::print_stats (int level, | |
| 1068 const char* str, | |
| 1069 double value) { | |
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1070 LineBuffer(level).append_and_print_cr("[%s: %5.1lf ms]", str, value); |
| 342 | 1071 } |
| 1072 | |
| 1073 void G1CollectorPolicy::print_stats (int level, | |
| 1074 const char* str, | |
| 1075 int value) { | |
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1076 LineBuffer(level).append_and_print_cr("[%s: %d]", str, value); |
| 342 | 1077 } |
| 1078 | |
| 1079 double G1CollectorPolicy::avg_value (double* data) { | |
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1080 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 1081 double ret = 0.0; |
| 1082 for (uint i = 0; i < ParallelGCThreads; ++i) | |
| 1083 ret += data[i]; | |
| 1084 return ret / (double) ParallelGCThreads; | |
| 1085 } else { | |
| 1086 return data[0]; | |
| 1087 } | |
| 1088 } | |
| 1089 | |
| 1090 double G1CollectorPolicy::max_value (double* data) { | |
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1091 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 1092 double ret = data[0]; |
| 1093 for (uint i = 1; i < ParallelGCThreads; ++i) | |
| 1094 if (data[i] > ret) | |
| 1095 ret = data[i]; | |
| 1096 return ret; | |
| 1097 } else { | |
| 1098 return data[0]; | |
| 1099 } | |
| 1100 } | |
| 1101 | |
| 1102 double G1CollectorPolicy::sum_of_values (double* data) { | |
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1103 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 1104 double sum = 0.0; |
| 1105 for (uint i = 0; i < ParallelGCThreads; i++) | |
| 1106 sum += data[i]; | |
| 1107 return sum; | |
| 1108 } else { | |
| 1109 return data[0]; | |
| 1110 } | |
| 1111 } | |
| 1112 | |
| 1113 double G1CollectorPolicy::max_sum (double* data1, | |
| 1114 double* data2) { | |
| 1115 double ret = data1[0] + data2[0]; | |
| 1116 | |
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1117 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 1118 for (uint i = 1; i < ParallelGCThreads; ++i) { |
| 1119 double data = data1[i] + data2[i]; | |
| 1120 if (data > ret) | |
| 1121 ret = data; | |
| 1122 } | |
| 1123 } | |
| 1124 return ret; | |
| 1125 } | |
| 1126 | |
| 1127 // Anything below that is considered to be zero | |
| 1128 #define MIN_TIMER_GRANULARITY 0.0000001 | |
| 1129 | |
| 1707 | 1130 void G1CollectorPolicy::record_collection_pause_end() { |
| 342 | 1131 double end_time_sec = os::elapsedTime(); |
| 1132 double elapsed_ms = _last_pause_time_ms; | |
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1133 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
| 342 | 1134 size_t rs_size = |
| 1135 _cur_collection_pause_used_regions_at_start - collection_set_size(); | |
| 1136 size_t cur_used_bytes = _g1->used(); | |
| 1137 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
| 1138 bool last_pause_included_initial_mark = false; | |
| 1707 | 1139 bool update_stats = !_g1->evacuation_failed(); |
| 342 | 1140 |
| 1141 #ifndef PRODUCT | |
| 1142 if (G1YoungSurvRateVerbose) { | |
| 1143 gclog_or_tty->print_cr(""); | |
| 1144 _short_lived_surv_rate_group->print(); | |
| 1145 // do that for any other surv rate groups too | |
| 1146 } | |
| 1147 #endif // PRODUCT | |
| 1148 | |
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1149 last_pause_included_initial_mark = during_initial_mark_pause(); |
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1150 if (last_pause_included_initial_mark) |
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1151 record_concurrent_mark_init_end(0.0); |
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1152 |
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1153 size_t min_used_targ = |
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1154 (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
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1155 |
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1156 |
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1157 if (!_g1->mark_in_progress() && !_last_full_young_gc) { |
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1158 assert(!last_pause_included_initial_mark, "invariant"); |
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1159 if (cur_used_bytes > min_used_targ && |
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1160 cur_used_bytes > _prev_collection_pause_used_at_end_bytes) { |
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1161 assert(!during_initial_mark_pause(), "we should not see this here"); |
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1162 |
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1163 // Note: this might have already been set, if during the last |
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1164 // pause we decided to start a cycle but at the beginning of |
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1165 // this pause we decided to postpone it. That's OK. |
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1166 set_initiate_conc_mark_if_possible(); |
| 342 | 1167 } |
| 1168 } | |
| 1169 | |
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1170 _prev_collection_pause_used_at_end_bytes = cur_used_bytes; |
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1171 |
| 342 | 1172 _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0, |
| 1173 end_time_sec, false); | |
| 1174 | |
| 1175 guarantee(_cur_collection_pause_used_regions_at_start >= | |
| 1176 collection_set_size(), | |
| 1177 "Negative RS size?"); | |
| 1178 | |
| 1179 // This assert is exempted when we're doing parallel collection pauses, | |
| 1180 // because the fragmentation caused by the parallel GC allocation buffers | |
| 1181 // can lead to more memory being used during collection than was used | |
| 1182 // before. Best leave this out until the fragmentation problem is fixed. | |
| 1183 // Pauses in which evacuation failed can also lead to negative | |
| 1184 // collections, since no space is reclaimed from a region containing an | |
| 1185 // object whose evacuation failed. | |
| 1186 // Further, we're now always doing parallel collection. But I'm still | |
| 1187 // leaving this here as a placeholder for a more precise assertion later. | |
| 1188 // (DLD, 10/05.) | |
| 1189 assert((true || parallel) // Always using GC LABs now. | |
| 1190 || _g1->evacuation_failed() | |
| 1191 || _cur_collection_pause_used_at_start_bytes >= cur_used_bytes, | |
| 1192 "Negative collection"); | |
| 1193 | |
| 1194 size_t freed_bytes = | |
| 1195 _cur_collection_pause_used_at_start_bytes - cur_used_bytes; | |
| 1196 size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; | |
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1197 |
| 342 | 1198 double survival_fraction = |
| 1199 (double)surviving_bytes/ | |
| 1200 (double)_collection_set_bytes_used_before; | |
| 1201 | |
| 1202 _n_pauses++; | |
| 1203 | |
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1204 double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); |
|
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1205 double mark_stack_scan_time = avg_value(_par_last_mark_stack_scan_times_ms); |
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1206 double update_rs_time = avg_value(_par_last_update_rs_times_ms); |
|
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1207 double update_rs_processed_buffers = |
|
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1208 sum_of_values(_par_last_update_rs_processed_buffers); |
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1209 double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); |
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1210 double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); |
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1211 double termination_time = avg_value(_par_last_termination_times_ms); |
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1212 |
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1213 double parallel_known_time = update_rs_time + |
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1214 ext_root_scan_time + |
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1215 mark_stack_scan_time + |
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1216 scan_rs_time + |
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1217 obj_copy_time + |
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1218 termination_time; |
|
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1219 |
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1220 double parallel_other_time = _cur_collection_par_time_ms - parallel_known_time; |
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1221 |
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1222 PauseSummary* summary = _summary; |
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1223 |
|
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|
1224 if (update_stats) { |
|
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1225 _recent_rs_scan_times_ms->add(scan_rs_time); |
| 342 | 1226 _recent_pause_times_ms->add(elapsed_ms); |
| 1227 _recent_rs_sizes->add(rs_size); | |
| 1228 | |
|
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1229 MainBodySummary* body_summary = summary->main_body_summary(); |
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1230 guarantee(body_summary != NULL, "should not be null!"); |
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1231 |
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1232 if (_satb_drain_time_set) |
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1233 body_summary->record_satb_drain_time_ms(_cur_satb_drain_time_ms); |
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|
1234 else |
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1235 body_summary->record_satb_drain_time_ms(0.0); |
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1236 |
|
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1237 body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); |
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1238 body_summary->record_mark_stack_scan_time_ms(mark_stack_scan_time); |
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1239 body_summary->record_update_rs_time_ms(update_rs_time); |
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1240 body_summary->record_scan_rs_time_ms(scan_rs_time); |
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1241 body_summary->record_obj_copy_time_ms(obj_copy_time); |
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1242 if (parallel) { |
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1243 body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); |
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1244 body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); |
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1245 body_summary->record_termination_time_ms(termination_time); |
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1246 body_summary->record_parallel_other_time_ms(parallel_other_time); |
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1247 } |
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1248 body_summary->record_mark_closure_time_ms(_mark_closure_time_ms); |
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1249 |
| 342 | 1250 // We exempt parallel collection from this check because Alloc Buffer |
| 1251 // fragmentation can produce negative collections. Same with evac | |
| 1252 // failure. | |
| 1253 // Further, we're now always doing parallel collection. But I'm still | |
| 1254 // leaving this here as a placeholder for a more precise assertion later. | |
| 1255 // (DLD, 10/05. | |
| 1256 assert((true || parallel) | |
| 1257 || _g1->evacuation_failed() | |
| 1258 || surviving_bytes <= _collection_set_bytes_used_before, | |
| 1259 "Or else negative collection!"); | |
| 1260 _recent_CS_bytes_used_before->add(_collection_set_bytes_used_before); | |
| 1261 _recent_CS_bytes_surviving->add(surviving_bytes); | |
| 1262 | |
| 1263 // this is where we update the allocation rate of the application | |
| 1264 double app_time_ms = | |
| 1265 (_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms); | |
| 1266 if (app_time_ms < MIN_TIMER_GRANULARITY) { | |
| 1267 // This usually happens due to the timer not having the required | |
| 1268 // granularity. Some Linuxes are the usual culprits. | |
| 1269 // We'll just set it to something (arbitrarily) small. | |
| 1270 app_time_ms = 1.0; | |
| 1271 } | |
| 1272 size_t regions_allocated = | |
| 1273 (_region_num_young - _prev_region_num_young) + | |
| 1274 (_region_num_tenured - _prev_region_num_tenured); | |
| 1275 double alloc_rate_ms = (double) regions_allocated / app_time_ms; | |
| 1276 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
| 1277 _prev_region_num_young = _region_num_young; | |
| 1278 _prev_region_num_tenured = _region_num_tenured; | |
| 1279 | |
| 1280 double interval_ms = | |
| 1281 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
| 1282 update_recent_gc_times(end_time_sec, elapsed_ms); | |
| 1283 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; | |
|
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1284 if (recent_avg_pause_time_ratio() < 0.0 || |
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1285 (recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
|
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1286 #ifndef PRODUCT |
|
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1287 // Dump info to allow post-facto debugging |
|
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1288 gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
|
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1289 gclog_or_tty->print_cr("-------------------------------------------"); |
|
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1290 gclog_or_tty->print_cr("Recent GC Times (ms):"); |
|
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1291 _recent_gc_times_ms->dump(); |
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1292 gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
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1293 _recent_prev_end_times_for_all_gcs_sec->dump(); |
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1294 gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
|
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|
1295 _recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
|
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|
1296 // In debug mode, terminate the JVM if the user wants to debug at this point. |
|
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|
1297 assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
|
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1298 #endif // !PRODUCT |
|
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1299 // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
|
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1300 // CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
|
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1301 if (_recent_avg_pause_time_ratio < 0.0) { |
|
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|
1302 _recent_avg_pause_time_ratio = 0.0; |
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1303 } else { |
|
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1304 assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
|
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1305 _recent_avg_pause_time_ratio = 1.0; |
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1306 } |
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1307 } |
| 342 | 1308 } |
| 1309 | |
| 1310 if (G1PolicyVerbose > 1) { | |
| 1311 gclog_or_tty->print_cr(" Recording collection pause(%d)", _n_pauses); | |
| 1312 } | |
| 1313 | |
| 1314 if (G1PolicyVerbose > 1) { | |
| 1315 gclog_or_tty->print_cr(" ET: %10.6f ms (avg: %10.6f ms)\n" | |
| 1316 " ET-RS: %10.6f ms (avg: %10.6f ms)\n" | |
| 1317 " |RS|: " SIZE_FORMAT, | |
| 1318 elapsed_ms, recent_avg_time_for_pauses_ms(), | |
|
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1319 scan_rs_time, recent_avg_time_for_rs_scan_ms(), |
| 342 | 1320 rs_size); |
| 1321 | |
| 1322 gclog_or_tty->print_cr(" Used at start: " SIZE_FORMAT"K" | |
| 1323 " At end " SIZE_FORMAT "K\n" | |
| 1324 " garbage : " SIZE_FORMAT "K" | |
| 1325 " of " SIZE_FORMAT "K\n" | |
| 1326 " survival : %6.2f%% (%6.2f%% avg)", | |
| 1327 _cur_collection_pause_used_at_start_bytes/K, | |
| 1328 _g1->used()/K, freed_bytes/K, | |
| 1329 _collection_set_bytes_used_before/K, | |
| 1330 survival_fraction*100.0, | |
| 1331 recent_avg_survival_fraction()*100.0); | |
| 1332 gclog_or_tty->print_cr(" Recent %% gc pause time: %6.2f", | |
| 1333 recent_avg_pause_time_ratio() * 100.0); | |
| 1334 } | |
| 1335 | |
| 1336 double other_time_ms = elapsed_ms; | |
| 1337 | |
| 1707 | 1338 if (_satb_drain_time_set) { |
| 1339 other_time_ms -= _cur_satb_drain_time_ms; | |
| 1340 } | |
| 1341 | |
| 1342 if (parallel) { | |
| 1343 other_time_ms -= _cur_collection_par_time_ms + _cur_clear_ct_time_ms; | |
| 1344 } else { | |
| 1345 other_time_ms -= | |
| 1346 update_rs_time + | |
| 1347 ext_root_scan_time + mark_stack_scan_time + | |
| 1348 scan_rs_time + obj_copy_time; | |
| 342 | 1349 } |
| 1350 | |
| 1351 if (PrintGCDetails) { | |
| 1707 | 1352 gclog_or_tty->print_cr("%s, %1.8lf secs]", |
| 342 | 1353 (last_pause_included_initial_mark) ? " (initial-mark)" : "", |
| 1354 elapsed_ms / 1000.0); | |
| 1355 | |
| 1707 | 1356 if (_satb_drain_time_set) { |
| 1357 print_stats(1, "SATB Drain Time", _cur_satb_drain_time_ms); | |
| 1358 } | |
| 1359 if (_last_satb_drain_processed_buffers >= 0) { | |
| 1360 print_stats(2, "Processed Buffers", _last_satb_drain_processed_buffers); | |
| 1361 } | |
| 1362 if (parallel) { | |
| 1363 print_stats(1, "Parallel Time", _cur_collection_par_time_ms); | |
| 2430 | 1364 print_par_stats(2, "GC Worker Start Time", _par_last_gc_worker_start_times_ms); |
| 1707 | 1365 print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); |
| 2430 | 1366 print_par_sizes(3, "Processed Buffers", _par_last_update_rs_processed_buffers); |
| 1367 print_par_stats(2, "Ext Root Scanning", _par_last_ext_root_scan_times_ms); | |
| 1368 print_par_stats(2, "Mark Stack Scanning", _par_last_mark_stack_scan_times_ms); | |
| 1707 | 1369 print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms); |
| 1370 print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms); | |
| 1371 print_par_stats(2, "Termination", _par_last_termination_times_ms); | |
| 2430 | 1372 print_par_sizes(3, "Termination Attempts", _par_last_termination_attempts); |
| 1373 print_par_stats(2, "GC Worker End Time", _par_last_gc_worker_end_times_ms); | |
| 1374 | |
| 1375 for (int i = 0; i < _parallel_gc_threads; i++) { | |
| 1376 _par_last_gc_worker_times_ms[i] = _par_last_gc_worker_end_times_ms[i] - _par_last_gc_worker_start_times_ms[i]; | |
| 1377 } | |
| 1378 print_par_stats(2, "GC Worker Times", _par_last_gc_worker_times_ms); | |
| 1379 | |
|
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1380 print_stats(2, "Parallel Other", parallel_other_time); |
| 1707 | 1381 print_stats(1, "Clear CT", _cur_clear_ct_time_ms); |
| 1382 } else { | |
| 1383 print_stats(1, "Update RS", update_rs_time); | |
| 1384 print_stats(2, "Processed Buffers", | |
| 1385 (int)update_rs_processed_buffers); | |
| 1386 print_stats(1, "Ext Root Scanning", ext_root_scan_time); | |
| 1387 print_stats(1, "Mark Stack Scanning", mark_stack_scan_time); | |
| 1388 print_stats(1, "Scan RS", scan_rs_time); | |
| 1389 print_stats(1, "Object Copying", obj_copy_time); | |
| 342 | 1390 } |
|
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1391 #ifndef PRODUCT |
|
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1392 print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms); |
|
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1393 print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms); |
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1394 print_stats(1, "Min Clear CC", _min_clear_cc_time_ms); |
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1395 print_stats(1, "Max Clear CC", _max_clear_cc_time_ms); |
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1396 if (_num_cc_clears > 0) { |
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1397 print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears)); |
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1398 } |
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1399 #endif |
| 342 | 1400 print_stats(1, "Other", other_time_ms); |
|
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1401 print_stats(2, "Choose CSet", _recorded_young_cset_choice_time_ms); |
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1402 |
| 342 | 1403 for (int i = 0; i < _aux_num; ++i) { |
| 1404 if (_cur_aux_times_set[i]) { | |
| 1405 char buffer[96]; | |
| 1406 sprintf(buffer, "Aux%d", i); | |
| 1407 print_stats(1, buffer, _cur_aux_times_ms[i]); | |
| 1408 } | |
| 1409 } | |
| 1410 } | |
| 1411 | |
| 1412 _all_pause_times_ms->add(elapsed_ms); | |
|
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1413 if (update_stats) { |
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1414 summary->record_total_time_ms(elapsed_ms); |
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1415 summary->record_other_time_ms(other_time_ms); |
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1416 } |
| 342 | 1417 for (int i = 0; i < _aux_num; ++i) |
| 1418 if (_cur_aux_times_set[i]) | |
| 1419 _all_aux_times_ms[i].add(_cur_aux_times_ms[i]); | |
| 1420 | |
| 1421 // Reset marks-between-pauses counter. | |
| 1422 _n_marks_since_last_pause = 0; | |
| 1423 | |
| 1424 // Update the efficiency-since-mark vars. | |
| 1425 double proc_ms = elapsed_ms * (double) _parallel_gc_threads; | |
| 1426 if (elapsed_ms < MIN_TIMER_GRANULARITY) { | |
| 1427 // This usually happens due to the timer not having the required | |
| 1428 // granularity. Some Linuxes are the usual culprits. | |
| 1429 // We'll just set it to something (arbitrarily) small. | |
| 1430 proc_ms = 1.0; | |
| 1431 } | |
| 1432 double cur_efficiency = (double) freed_bytes / proc_ms; | |
| 1433 | |
| 1434 bool new_in_marking_window = _in_marking_window; | |
| 1435 bool new_in_marking_window_im = false; | |
|
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1436 if (during_initial_mark_pause()) { |
| 342 | 1437 new_in_marking_window = true; |
| 1438 new_in_marking_window_im = true; | |
| 1439 } | |
| 1440 | |
|
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1441 if (_last_full_young_gc) { |
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1442 set_full_young_gcs(false); |
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1443 _last_full_young_gc = false; |
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1444 } |
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1445 |
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1446 if ( !_last_young_gc_full ) { |
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1447 if ( _should_revert_to_full_young_gcs || |
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1448 _known_garbage_ratio < 0.05 || |
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1449 (adaptive_young_list_length() && |
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1450 (get_gc_eff_factor() * cur_efficiency < predict_young_gc_eff())) ) { |
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1451 set_full_young_gcs(true); |
| 342 | 1452 } |
|
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1453 } |
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1454 _should_revert_to_full_young_gcs = false; |
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1455 |
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1456 if (_last_young_gc_full && !_during_marking) { |
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1457 _young_gc_eff_seq->add(cur_efficiency); |
| 342 | 1458 } |
| 1459 | |
| 1460 _short_lived_surv_rate_group->start_adding_regions(); | |
| 1461 // do that for any other surv rate groupsx | |
| 1462 | |
| 1463 // <NEW PREDICTION> | |
| 1464 | |
| 677 | 1465 if (update_stats) { |
| 342 | 1466 double pause_time_ms = elapsed_ms; |
| 1467 | |
| 1468 size_t diff = 0; | |
| 1469 if (_max_pending_cards >= _pending_cards) | |
| 1470 diff = _max_pending_cards - _pending_cards; | |
| 1471 _pending_card_diff_seq->add((double) diff); | |
| 1472 | |
| 1473 double cost_per_card_ms = 0.0; | |
| 1474 if (_pending_cards > 0) { | |
| 1475 cost_per_card_ms = update_rs_time / (double) _pending_cards; | |
| 1476 _cost_per_card_ms_seq->add(cost_per_card_ms); | |
| 1477 } | |
| 1478 | |
| 1479 size_t cards_scanned = _g1->cards_scanned(); | |
| 1480 | |
| 1481 double cost_per_entry_ms = 0.0; | |
| 1482 if (cards_scanned > 10) { | |
| 1483 cost_per_entry_ms = scan_rs_time / (double) cards_scanned; | |
| 1484 if (_last_young_gc_full) | |
| 1485 _cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
| 1486 else | |
| 1487 _partially_young_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
| 1488 } | |
| 1489 | |
| 1490 if (_max_rs_lengths > 0) { | |
| 1491 double cards_per_entry_ratio = | |
| 1492 (double) cards_scanned / (double) _max_rs_lengths; | |
| 1493 if (_last_young_gc_full) | |
| 1494 _fully_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
| 1495 else | |
| 1496 _partially_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
| 1497 } | |
| 1498 | |
| 1499 size_t rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; | |
| 1500 if (rs_length_diff >= 0) | |
| 1501 _rs_length_diff_seq->add((double) rs_length_diff); | |
| 1502 | |
| 1503 size_t copied_bytes = surviving_bytes; | |
| 1504 double cost_per_byte_ms = 0.0; | |
| 1505 if (copied_bytes > 0) { | |
| 1506 cost_per_byte_ms = obj_copy_time / (double) copied_bytes; | |
| 1507 if (_in_marking_window) | |
| 1508 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); | |
| 1509 else | |
| 1510 _cost_per_byte_ms_seq->add(cost_per_byte_ms); | |
| 1511 } | |
| 1512 | |
| 1513 double all_other_time_ms = pause_time_ms - | |
|
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1514 (update_rs_time + scan_rs_time + obj_copy_time + |
| 342 | 1515 _mark_closure_time_ms + termination_time); |
| 1516 | |
| 1517 double young_other_time_ms = 0.0; | |
| 1518 if (_recorded_young_regions > 0) { | |
| 1519 young_other_time_ms = | |
| 1520 _recorded_young_cset_choice_time_ms + | |
| 1521 _recorded_young_free_cset_time_ms; | |
| 1522 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / | |
| 1523 (double) _recorded_young_regions); | |
| 1524 } | |
| 1525 double non_young_other_time_ms = 0.0; | |
| 1526 if (_recorded_non_young_regions > 0) { | |
| 1527 non_young_other_time_ms = | |
| 1528 _recorded_non_young_cset_choice_time_ms + | |
| 1529 _recorded_non_young_free_cset_time_ms; | |
| 1530 | |
| 1531 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
| 1532 (double) _recorded_non_young_regions); | |
| 1533 } | |
| 1534 | |
| 1535 double constant_other_time_ms = all_other_time_ms - | |
| 1536 (young_other_time_ms + non_young_other_time_ms); | |
| 1537 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
| 1538 | |
| 1539 double survival_ratio = 0.0; | |
| 1540 if (_bytes_in_collection_set_before_gc > 0) { | |
|
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1541 survival_ratio = (double) _bytes_copied_during_gc / |
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1542 (double) _bytes_in_collection_set_before_gc; |
| 342 | 1543 } |
| 1544 | |
| 1545 _pending_cards_seq->add((double) _pending_cards); | |
| 1546 _scanned_cards_seq->add((double) cards_scanned); | |
| 1547 _rs_lengths_seq->add((double) _max_rs_lengths); | |
| 1548 | |
| 1549 double expensive_region_limit_ms = | |
| 751 | 1550 (double) MaxGCPauseMillis - predict_constant_other_time_ms(); |
| 342 | 1551 if (expensive_region_limit_ms < 0.0) { |
| 1552 // this means that the other time was predicted to be longer than | |
| 1553 // than the max pause time | |
| 751 | 1554 expensive_region_limit_ms = (double) MaxGCPauseMillis; |
| 342 | 1555 } |
| 1556 _expensive_region_limit_ms = expensive_region_limit_ms; | |
| 1557 | |
| 1558 if (PREDICTIONS_VERBOSE) { | |
| 1559 gclog_or_tty->print_cr(""); | |
| 1560 gclog_or_tty->print_cr("PREDICTIONS %1.4lf %d " | |
|
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1561 "REGIONS %d %d %d " |
| 342 | 1562 "PENDING_CARDS %d %d " |
| 1563 "CARDS_SCANNED %d %d " | |
| 1564 "RS_LENGTHS %d %d " | |
| 1565 "RS_UPDATE %1.6lf %1.6lf RS_SCAN %1.6lf %1.6lf " | |
| 1566 "SURVIVAL_RATIO %1.6lf %1.6lf " | |
| 1567 "OBJECT_COPY %1.6lf %1.6lf OTHER_CONSTANT %1.6lf %1.6lf " | |
| 1568 "OTHER_YOUNG %1.6lf %1.6lf " | |
| 1569 "OTHER_NON_YOUNG %1.6lf %1.6lf " | |
| 1570 "VTIME_DIFF %1.6lf TERMINATION %1.6lf " | |
| 1571 "ELAPSED %1.6lf %1.6lf ", | |
| 1572 _cur_collection_start_sec, | |
| 1573 (!_last_young_gc_full) ? 2 : | |
| 1574 (last_pause_included_initial_mark) ? 1 : 0, | |
| 1575 _recorded_region_num, | |
| 1576 _recorded_young_regions, | |
| 1577 _recorded_non_young_regions, | |
| 1578 _predicted_pending_cards, _pending_cards, | |
| 1579 _predicted_cards_scanned, cards_scanned, | |
| 1580 _predicted_rs_lengths, _max_rs_lengths, | |
| 1581 _predicted_rs_update_time_ms, update_rs_time, | |
| 1582 _predicted_rs_scan_time_ms, scan_rs_time, | |
| 1583 _predicted_survival_ratio, survival_ratio, | |
| 1584 _predicted_object_copy_time_ms, obj_copy_time, | |
| 1585 _predicted_constant_other_time_ms, constant_other_time_ms, | |
| 1586 _predicted_young_other_time_ms, young_other_time_ms, | |
| 1587 _predicted_non_young_other_time_ms, | |
| 1588 non_young_other_time_ms, | |
| 1589 _vtime_diff_ms, termination_time, | |
| 1590 _predicted_pause_time_ms, elapsed_ms); | |
| 1591 } | |
| 1592 | |
| 1593 if (G1PolicyVerbose > 0) { | |
| 1594 gclog_or_tty->print_cr("Pause Time, predicted: %1.4lfms (predicted %s), actual: %1.4lfms", | |
| 1595 _predicted_pause_time_ms, | |
| 1596 (_within_target) ? "within" : "outside", | |
| 1597 elapsed_ms); | |
| 1598 } | |
| 1599 | |
| 1600 } | |
| 1601 | |
| 1602 _in_marking_window = new_in_marking_window; | |
| 1603 _in_marking_window_im = new_in_marking_window_im; | |
| 1604 _free_regions_at_end_of_collection = _g1->free_regions(); | |
| 1605 calculate_young_list_min_length(); | |
|
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1606 calculate_young_list_target_length(); |
| 342 | 1607 |
| 1111 | 1608 // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
| 1282 | 1609 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
| 1111 | 1610 adjust_concurrent_refinement(update_rs_time, update_rs_processed_buffers, update_rs_time_goal_ms); |
| 342 | 1611 // </NEW PREDICTION> |
| 1612 } | |
| 1613 | |
|
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1614 #define EXT_SIZE_FORMAT "%d%s" |
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1615 #define EXT_SIZE_PARAMS(bytes) \ |
|
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1616 byte_size_in_proper_unit((bytes)), \ |
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1617 proper_unit_for_byte_size((bytes)) |
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1618 |
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1619 void G1CollectorPolicy::print_heap_transition() { |
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1620 if (PrintGCDetails) { |
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1621 YoungList* young_list = _g1->young_list(); |
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1622 size_t eden_bytes = young_list->eden_used_bytes(); |
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1623 size_t survivor_bytes = young_list->survivor_used_bytes(); |
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1624 size_t used_before_gc = _cur_collection_pause_used_at_start_bytes; |
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1625 size_t used = _g1->used(); |
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1626 size_t capacity = _g1->capacity(); |
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1627 |
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1628 gclog_or_tty->print_cr( |
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1629 " [Eden: "EXT_SIZE_FORMAT"->"EXT_SIZE_FORMAT" " |
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1630 "Survivors: "EXT_SIZE_FORMAT"->"EXT_SIZE_FORMAT" " |
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1631 "Heap: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->" |
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1632 EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")]", |
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1633 EXT_SIZE_PARAMS(_eden_bytes_before_gc), |
|
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1634 EXT_SIZE_PARAMS(eden_bytes), |
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1635 EXT_SIZE_PARAMS(_survivor_bytes_before_gc), |
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1636 EXT_SIZE_PARAMS(survivor_bytes), |
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1637 EXT_SIZE_PARAMS(used_before_gc), |
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1638 EXT_SIZE_PARAMS(_capacity_before_gc), |
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1639 EXT_SIZE_PARAMS(used), |
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1640 EXT_SIZE_PARAMS(capacity)); |
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1641 } else if (PrintGC) { |
|
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1642 _g1->print_size_transition(gclog_or_tty, |
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1643 _cur_collection_pause_used_at_start_bytes, |
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1644 _g1->used(), _g1->capacity()); |
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1645 } |
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1646 } |
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1647 |
| 342 | 1648 // <NEW PREDICTION> |
| 1649 | |
| 1111 | 1650 void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
| 1651 double update_rs_processed_buffers, | |
| 1652 double goal_ms) { | |
| 1653 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 1654 ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); | |
| 1655 | |
| 1282 | 1656 if (G1UseAdaptiveConcRefinement) { |
| 1111 | 1657 const int k_gy = 3, k_gr = 6; |
| 1658 const double inc_k = 1.1, dec_k = 0.9; | |
| 1659 | |
| 1660 int g = cg1r->green_zone(); | |
| 1661 if (update_rs_time > goal_ms) { | |
| 1662 g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. | |
| 1663 } else { | |
| 1664 if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { | |
| 1665 g = (int)MAX2(g * inc_k, g + 1.0); | |
| 1666 } | |
| 1667 } | |
| 1668 // Change the refinement threads params | |
| 1669 cg1r->set_green_zone(g); | |
| 1670 cg1r->set_yellow_zone(g * k_gy); | |
| 1671 cg1r->set_red_zone(g * k_gr); | |
| 1672 cg1r->reinitialize_threads(); | |
| 1673 | |
| 1674 int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); | |
| 1675 int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, | |
| 1676 cg1r->yellow_zone()); | |
| 1677 // Change the barrier params | |
| 1678 dcqs.set_process_completed_threshold(processing_threshold); | |
| 1679 dcqs.set_max_completed_queue(cg1r->red_zone()); | |
| 1680 } | |
| 1681 | |
| 1682 int curr_queue_size = dcqs.completed_buffers_num(); | |
| 1683 if (curr_queue_size >= cg1r->yellow_zone()) { | |
| 1684 dcqs.set_completed_queue_padding(curr_queue_size); | |
| 1685 } else { | |
| 1686 dcqs.set_completed_queue_padding(0); | |
| 1687 } | |
| 1688 dcqs.notify_if_necessary(); | |
| 1689 } | |
| 1690 | |
| 342 | 1691 double |
| 1692 G1CollectorPolicy:: | |
| 1693 predict_young_collection_elapsed_time_ms(size_t adjustment) { | |
| 1694 guarantee( adjustment == 0 || adjustment == 1, "invariant" ); | |
| 1695 | |
| 1696 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
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1697 size_t young_num = g1h->young_list()->length(); |
| 342 | 1698 if (young_num == 0) |
| 1699 return 0.0; | |
| 1700 | |
| 1701 young_num += adjustment; | |
| 1702 size_t pending_cards = predict_pending_cards(); | |
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1703 size_t rs_lengths = g1h->young_list()->sampled_rs_lengths() + |
| 342 | 1704 predict_rs_length_diff(); |
| 1705 size_t card_num; | |
| 1706 if (full_young_gcs()) | |
| 1707 card_num = predict_young_card_num(rs_lengths); | |
| 1708 else | |
| 1709 card_num = predict_non_young_card_num(rs_lengths); | |
| 1710 size_t young_byte_size = young_num * HeapRegion::GrainBytes; | |
| 1711 double accum_yg_surv_rate = | |
| 1712 _short_lived_surv_rate_group->accum_surv_rate(adjustment); | |
| 1713 | |
| 1714 size_t bytes_to_copy = | |
| 1715 (size_t) (accum_yg_surv_rate * (double) HeapRegion::GrainBytes); | |
| 1716 | |
| 1717 return | |
| 1718 predict_rs_update_time_ms(pending_cards) + | |
| 1719 predict_rs_scan_time_ms(card_num) + | |
| 1720 predict_object_copy_time_ms(bytes_to_copy) + | |
| 1721 predict_young_other_time_ms(young_num) + | |
| 1722 predict_constant_other_time_ms(); | |
| 1723 } | |
| 1724 | |
| 1725 double | |
| 1726 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { | |
| 1727 size_t rs_length = predict_rs_length_diff(); | |
| 1728 size_t card_num; | |
| 1729 if (full_young_gcs()) | |
| 1730 card_num = predict_young_card_num(rs_length); | |
| 1731 else | |
| 1732 card_num = predict_non_young_card_num(rs_length); | |
| 1733 return predict_base_elapsed_time_ms(pending_cards, card_num); | |
| 1734 } | |
| 1735 | |
| 1736 double | |
| 1737 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
| 1738 size_t scanned_cards) { | |
| 1739 return | |
| 1740 predict_rs_update_time_ms(pending_cards) + | |
| 1741 predict_rs_scan_time_ms(scanned_cards) + | |
| 1742 predict_constant_other_time_ms(); | |
| 1743 } | |
| 1744 | |
| 1745 double | |
| 1746 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
| 1747 bool young) { | |
| 1748 size_t rs_length = hr->rem_set()->occupied(); | |
| 1749 size_t card_num; | |
| 1750 if (full_young_gcs()) | |
| 1751 card_num = predict_young_card_num(rs_length); | |
| 1752 else | |
| 1753 card_num = predict_non_young_card_num(rs_length); | |
| 1754 size_t bytes_to_copy = predict_bytes_to_copy(hr); | |
| 1755 | |
| 1756 double region_elapsed_time_ms = | |
| 1757 predict_rs_scan_time_ms(card_num) + | |
| 1758 predict_object_copy_time_ms(bytes_to_copy); | |
| 1759 | |
| 1760 if (young) | |
| 1761 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
| 1762 else | |
| 1763 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
| 1764 | |
| 1765 return region_elapsed_time_ms; | |
| 1766 } | |
| 1767 | |
| 1768 size_t | |
| 1769 G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { | |
| 1770 size_t bytes_to_copy; | |
| 1771 if (hr->is_marked()) | |
| 1772 bytes_to_copy = hr->max_live_bytes(); | |
| 1773 else { | |
| 1774 guarantee( hr->is_young() && hr->age_in_surv_rate_group() != -1, | |
| 1775 "invariant" ); | |
| 1776 int age = hr->age_in_surv_rate_group(); | |
| 545 | 1777 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
| 342 | 1778 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
| 1779 } | |
| 1780 | |
| 1781 return bytes_to_copy; | |
| 1782 } | |
| 1783 | |
| 1784 void | |
| 1785 G1CollectorPolicy::start_recording_regions() { | |
| 1786 _recorded_rs_lengths = 0; | |
| 1787 _recorded_young_regions = 0; | |
| 1788 _recorded_non_young_regions = 0; | |
| 1789 | |
| 1790 #if PREDICTIONS_VERBOSE | |
| 1791 _recorded_marked_bytes = 0; | |
| 1792 _recorded_young_bytes = 0; | |
| 1793 _predicted_bytes_to_copy = 0; | |
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1794 _predicted_rs_lengths = 0; |
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1795 _predicted_cards_scanned = 0; |
| 342 | 1796 #endif // PREDICTIONS_VERBOSE |
| 1797 } | |
| 1798 | |
| 1799 void | |
|
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1800 G1CollectorPolicy::record_cset_region_info(HeapRegion* hr, bool young) { |
| 342 | 1801 #if PREDICTIONS_VERBOSE |
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1802 if (!young) { |
| 342 | 1803 _recorded_marked_bytes += hr->max_live_bytes(); |
| 1804 } | |
| 1805 _predicted_bytes_to_copy += predict_bytes_to_copy(hr); | |
| 1806 #endif // PREDICTIONS_VERBOSE | |
| 1807 | |
| 1808 size_t rs_length = hr->rem_set()->occupied(); | |
| 1809 _recorded_rs_lengths += rs_length; | |
| 1810 } | |
| 1811 | |
| 1812 void | |
|
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1813 G1CollectorPolicy::record_non_young_cset_region(HeapRegion* hr) { |
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1814 assert(!hr->is_young(), "should not call this"); |
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1815 ++_recorded_non_young_regions; |
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1816 record_cset_region_info(hr, false); |
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1817 } |
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1818 |
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1819 void |
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1820 G1CollectorPolicy::set_recorded_young_regions(size_t n_regions) { |
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1821 _recorded_young_regions = n_regions; |
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1822 } |
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1823 |
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1824 void G1CollectorPolicy::set_recorded_young_bytes(size_t bytes) { |
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1825 #if PREDICTIONS_VERBOSE |
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1826 _recorded_young_bytes = bytes; |
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1827 #endif // PREDICTIONS_VERBOSE |
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1828 } |
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1829 |
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1830 void G1CollectorPolicy::set_recorded_rs_lengths(size_t rs_lengths) { |
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1831 _recorded_rs_lengths = rs_lengths; |
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1832 } |
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1833 |
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1834 void G1CollectorPolicy::set_predicted_bytes_to_copy(size_t bytes) { |
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1835 _predicted_bytes_to_copy = bytes; |
| 342 | 1836 } |
| 1837 | |
| 1838 void | |
| 1839 G1CollectorPolicy::end_recording_regions() { | |
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1840 // The _predicted_pause_time_ms field is referenced in code |
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1841 // not under PREDICTIONS_VERBOSE. Let's initialize it. |
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1842 _predicted_pause_time_ms = -1.0; |
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1843 |
| 342 | 1844 #if PREDICTIONS_VERBOSE |
| 1845 _predicted_pending_cards = predict_pending_cards(); | |
| 1846 _predicted_rs_lengths = _recorded_rs_lengths + predict_rs_length_diff(); | |
| 1847 if (full_young_gcs()) | |
| 1848 _predicted_cards_scanned += predict_young_card_num(_predicted_rs_lengths); | |
| 1849 else | |
| 1850 _predicted_cards_scanned += | |
| 1851 predict_non_young_card_num(_predicted_rs_lengths); | |
| 1852 _recorded_region_num = _recorded_young_regions + _recorded_non_young_regions; | |
| 1853 | |
| 1854 _predicted_rs_update_time_ms = | |
| 1855 predict_rs_update_time_ms(_g1->pending_card_num()); | |
| 1856 _predicted_rs_scan_time_ms = | |
| 1857 predict_rs_scan_time_ms(_predicted_cards_scanned); | |
| 1858 _predicted_object_copy_time_ms = | |
| 1859 predict_object_copy_time_ms(_predicted_bytes_to_copy); | |
| 1860 _predicted_constant_other_time_ms = | |
| 1861 predict_constant_other_time_ms(); | |
| 1862 _predicted_young_other_time_ms = | |
| 1863 predict_young_other_time_ms(_recorded_young_regions); | |
| 1864 _predicted_non_young_other_time_ms = | |
| 1865 predict_non_young_other_time_ms(_recorded_non_young_regions); | |
| 1866 | |
| 1867 _predicted_pause_time_ms = | |
| 1868 _predicted_rs_update_time_ms + | |
| 1869 _predicted_rs_scan_time_ms + | |
| 1870 _predicted_object_copy_time_ms + | |
| 1871 _predicted_constant_other_time_ms + | |
| 1872 _predicted_young_other_time_ms + | |
| 1873 _predicted_non_young_other_time_ms; | |
| 1874 #endif // PREDICTIONS_VERBOSE | |
| 1875 } | |
| 1876 | |
| 1877 void G1CollectorPolicy::check_if_region_is_too_expensive(double | |
| 1878 predicted_time_ms) { | |
| 1879 // I don't think we need to do this when in young GC mode since | |
| 1880 // marking will be initiated next time we hit the soft limit anyway... | |
| 1881 if (predicted_time_ms > _expensive_region_limit_ms) { | |
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1883 _should_revert_to_full_young_gcs = true; |
| 342 | 1884 } |
| 1885 } | |
| 1886 | |
| 1887 // </NEW PREDICTION> | |
| 1888 | |
| 1889 | |
| 1890 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, | |
| 1891 double elapsed_ms) { | |
| 1892 _recent_gc_times_ms->add(elapsed_ms); | |
| 1893 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
| 1894 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
| 1895 } | |
| 1896 | |
| 1897 double G1CollectorPolicy::recent_avg_time_for_pauses_ms() { | |
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1898 if (_recent_pause_times_ms->num() == 0) { |
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1899 return (double) MaxGCPauseMillis; |
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1900 } |
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1901 return _recent_pause_times_ms->avg(); |
| 342 | 1902 } |
| 1903 | |
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1904 double G1CollectorPolicy::recent_avg_time_for_rs_scan_ms() { |
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1905 if (_recent_rs_scan_times_ms->num() == 0) { |
| 751 | 1906 return (double)MaxGCPauseMillis/3.0; |
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1907 } |
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1908 return _recent_rs_scan_times_ms->avg(); |
| 342 | 1909 } |
| 1910 | |
| 1911 int G1CollectorPolicy::number_of_recent_gcs() { | |
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1912 assert(_recent_rs_scan_times_ms->num() == |
| 342 | 1913 _recent_pause_times_ms->num(), "Sequence out of sync"); |
| 1914 assert(_recent_pause_times_ms->num() == | |
| 1915 _recent_CS_bytes_used_before->num(), "Sequence out of sync"); | |
| 1916 assert(_recent_CS_bytes_used_before->num() == | |
| 1917 _recent_CS_bytes_surviving->num(), "Sequence out of sync"); | |
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1918 |
| 342 | 1919 return _recent_pause_times_ms->num(); |
| 1920 } | |
| 1921 | |
| 1922 double G1CollectorPolicy::recent_avg_survival_fraction() { | |
| 1923 return recent_avg_survival_fraction_work(_recent_CS_bytes_surviving, | |
| 1924 _recent_CS_bytes_used_before); | |
| 1925 } | |
| 1926 | |
| 1927 double G1CollectorPolicy::last_survival_fraction() { | |
| 1928 return last_survival_fraction_work(_recent_CS_bytes_surviving, | |
| 1929 _recent_CS_bytes_used_before); | |
| 1930 } | |
| 1931 | |
| 1932 double | |
| 1933 G1CollectorPolicy::recent_avg_survival_fraction_work(TruncatedSeq* surviving, | |
| 1934 TruncatedSeq* before) { | |
| 1935 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
| 1936 if (before->sum() > 0.0) { | |
| 1937 double recent_survival_rate = surviving->sum() / before->sum(); | |
| 1938 // We exempt parallel collection from this check because Alloc Buffer | |
| 1939 // fragmentation can produce negative collections. | |
| 1940 // Further, we're now always doing parallel collection. But I'm still | |
| 1941 // leaving this here as a placeholder for a more precise assertion later. | |
| 1942 // (DLD, 10/05.) | |
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1943 assert((true || G1CollectedHeap::use_parallel_gc_threads()) || |
| 342 | 1944 _g1->evacuation_failed() || |
| 1945 recent_survival_rate <= 1.0, "Or bad frac"); | |
| 1946 return recent_survival_rate; | |
| 1947 } else { | |
| 1948 return 1.0; // Be conservative. | |
| 1949 } | |
| 1950 } | |
| 1951 | |
| 1952 double | |
| 1953 G1CollectorPolicy::last_survival_fraction_work(TruncatedSeq* surviving, | |
| 1954 TruncatedSeq* before) { | |
| 1955 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
| 1956 if (surviving->num() > 0 && before->last() > 0.0) { | |
| 1957 double last_survival_rate = surviving->last() / before->last(); | |
| 1958 // We exempt parallel collection from this check because Alloc Buffer | |
| 1959 // fragmentation can produce negative collections. | |
| 1960 // Further, we're now always doing parallel collection. But I'm still | |
| 1961 // leaving this here as a placeholder for a more precise assertion later. | |
| 1962 // (DLD, 10/05.) | |
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1963 assert((true || G1CollectedHeap::use_parallel_gc_threads()) || |
| 342 | 1964 last_survival_rate <= 1.0, "Or bad frac"); |
| 1965 return last_survival_rate; | |
| 1966 } else { | |
| 1967 return 1.0; | |
| 1968 } | |
| 1969 } | |
| 1970 | |
| 1971 static const int survival_min_obs = 5; | |
| 1972 static double survival_min_obs_limits[] = { 0.9, 0.7, 0.5, 0.3, 0.1 }; | |
| 1973 static const double min_survival_rate = 0.1; | |
| 1974 | |
| 1975 double | |
| 1976 G1CollectorPolicy::conservative_avg_survival_fraction_work(double avg, | |
| 1977 double latest) { | |
| 1978 double res = avg; | |
| 1979 if (number_of_recent_gcs() < survival_min_obs) { | |
| 1980 res = MAX2(res, survival_min_obs_limits[number_of_recent_gcs()]); | |
| 1981 } | |
| 1982 res = MAX2(res, latest); | |
| 1983 res = MAX2(res, min_survival_rate); | |
| 1984 // In the parallel case, LAB fragmentation can produce "negative | |
| 1985 // collections"; so can evac failure. Cap at 1.0 | |
| 1986 res = MIN2(res, 1.0); | |
| 1987 return res; | |
| 1988 } | |
| 1989 | |
| 1990 size_t G1CollectorPolicy::expansion_amount() { | |
| 1356 | 1991 if ((recent_avg_pause_time_ratio() * 100.0) > _gc_overhead_perc) { |
| 751 | 1992 // We will double the existing space, or take |
| 1993 // G1ExpandByPercentOfAvailable % of the available expansion | |
| 1994 // space, whichever is smaller, bounded below by a minimum | |
| 1995 // expansion (unless that's all that's left.) | |
| 342 | 1996 const size_t min_expand_bytes = 1*M; |
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1997 size_t reserved_bytes = _g1->max_capacity(); |
| 342 | 1998 size_t committed_bytes = _g1->capacity(); |
| 1999 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
| 2000 size_t expand_bytes; | |
| 2001 size_t expand_bytes_via_pct = | |
| 751 | 2002 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
| 342 | 2003 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
| 2004 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
| 2005 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
| 2006 if (G1PolicyVerbose > 1) { | |
| 2007 gclog_or_tty->print("Decided to expand: ratio = %5.2f, " | |
| 2008 "committed = %d%s, uncommited = %d%s, via pct = %d%s.\n" | |
| 2009 " Answer = %d.\n", | |
| 2010 recent_avg_pause_time_ratio(), | |
| 2011 byte_size_in_proper_unit(committed_bytes), | |
| 2012 proper_unit_for_byte_size(committed_bytes), | |
| 2013 byte_size_in_proper_unit(uncommitted_bytes), | |
| 2014 proper_unit_for_byte_size(uncommitted_bytes), | |
| 2015 byte_size_in_proper_unit(expand_bytes_via_pct), | |
| 2016 proper_unit_for_byte_size(expand_bytes_via_pct), | |
| 2017 byte_size_in_proper_unit(expand_bytes), | |
| 2018 proper_unit_for_byte_size(expand_bytes)); | |
| 2019 } | |
| 2020 return expand_bytes; | |
| 2021 } else { | |
| 2022 return 0; | |
| 2023 } | |
| 2024 } | |
| 2025 | |
| 2026 void G1CollectorPolicy::note_start_of_mark_thread() { | |
| 2027 _mark_thread_startup_sec = os::elapsedTime(); | |
| 2028 } | |
| 2029 | |
| 2030 class CountCSClosure: public HeapRegionClosure { | |
| 2031 G1CollectorPolicy* _g1_policy; | |
| 2032 public: | |
| 2033 CountCSClosure(G1CollectorPolicy* g1_policy) : | |
| 2034 _g1_policy(g1_policy) {} | |
| 2035 bool doHeapRegion(HeapRegion* r) { | |
| 2036 _g1_policy->_bytes_in_collection_set_before_gc += r->used(); | |
| 2037 return false; | |
| 2038 } | |
| 2039 }; | |
| 2040 | |
| 2041 void G1CollectorPolicy::count_CS_bytes_used() { | |
| 2042 CountCSClosure cs_closure(this); | |
| 2043 _g1->collection_set_iterate(&cs_closure); | |
| 2044 } | |
| 2045 | |
| 2046 void G1CollectorPolicy::print_summary (int level, | |
| 2047 const char* str, | |
| 2048 NumberSeq* seq) const { | |
| 2049 double sum = seq->sum(); | |
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2050 LineBuffer(level + 1).append_and_print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", |
| 342 | 2051 str, sum / 1000.0, seq->avg()); |
| 2052 } | |
| 2053 | |
| 2054 void G1CollectorPolicy::print_summary_sd (int level, | |
| 2055 const char* str, | |
| 2056 NumberSeq* seq) const { | |
| 2057 print_summary(level, str, seq); | |
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2058 LineBuffer(level + 6).append_and_print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", |
| 342 | 2059 seq->num(), seq->sd(), seq->maximum()); |
| 2060 } | |
| 2061 | |
| 2062 void G1CollectorPolicy::check_other_times(int level, | |
| 2063 NumberSeq* other_times_ms, | |
| 2064 NumberSeq* calc_other_times_ms) const { | |
| 2065 bool should_print = false; | |
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2066 LineBuffer buf(level + 2); |
| 342 | 2067 |
| 2068 double max_sum = MAX2(fabs(other_times_ms->sum()), | |
| 2069 fabs(calc_other_times_ms->sum())); | |
| 2070 double min_sum = MIN2(fabs(other_times_ms->sum()), | |
| 2071 fabs(calc_other_times_ms->sum())); | |
| 2072 double sum_ratio = max_sum / min_sum; | |
| 2073 if (sum_ratio > 1.1) { | |
| 2074 should_print = true; | |
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2075 buf.append_and_print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); |
| 342 | 2076 } |
| 2077 | |
| 2078 double max_avg = MAX2(fabs(other_times_ms->avg()), | |
| 2079 fabs(calc_other_times_ms->avg())); | |
| 2080 double min_avg = MIN2(fabs(other_times_ms->avg()), | |
| 2081 fabs(calc_other_times_ms->avg())); | |
| 2082 double avg_ratio = max_avg / min_avg; | |
| 2083 if (avg_ratio > 1.1) { | |
| 2084 should_print = true; | |
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2085 buf.append_and_print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); |
| 342 | 2086 } |
| 2087 | |
| 2088 if (other_times_ms->sum() < -0.01) { | |
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2089 buf.append_and_print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); |
| 342 | 2090 } |
| 2091 | |
| 2092 if (other_times_ms->avg() < -0.01) { | |
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2093 buf.append_and_print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); |
| 342 | 2094 } |
| 2095 | |
| 2096 if (calc_other_times_ms->sum() < -0.01) { | |
| 2097 should_print = true; | |
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2098 buf.append_and_print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); |
| 342 | 2099 } |
| 2100 | |
| 2101 if (calc_other_times_ms->avg() < -0.01) { | |
| 2102 should_print = true; | |
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2103 buf.append_and_print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); |
| 342 | 2104 } |
| 2105 | |
| 2106 if (should_print) | |
| 2107 print_summary(level, "Other(Calc)", calc_other_times_ms); | |
| 2108 } | |
| 2109 | |
| 2110 void G1CollectorPolicy::print_summary(PauseSummary* summary) const { | |
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2111 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
| 342 | 2112 MainBodySummary* body_summary = summary->main_body_summary(); |
| 2113 if (summary->get_total_seq()->num() > 0) { | |
| 677 | 2114 print_summary_sd(0, "Evacuation Pauses", summary->get_total_seq()); |
| 342 | 2115 if (body_summary != NULL) { |
| 2116 print_summary(1, "SATB Drain", body_summary->get_satb_drain_seq()); | |
| 2117 if (parallel) { | |
| 2118 print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); | |
| 2119 print_summary(2, "Update RS", body_summary->get_update_rs_seq()); | |
| 2120 print_summary(2, "Ext Root Scanning", | |
| 2121 body_summary->get_ext_root_scan_seq()); | |
| 2122 print_summary(2, "Mark Stack Scanning", | |
| 2123 body_summary->get_mark_stack_scan_seq()); | |
| 2124 print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); | |
| 2125 print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); | |
| 2126 print_summary(2, "Termination", body_summary->get_termination_seq()); | |
| 2127 print_summary(2, "Other", body_summary->get_parallel_other_seq()); | |
| 2128 { | |
| 2129 NumberSeq* other_parts[] = { | |
| 2130 body_summary->get_update_rs_seq(), | |
| 2131 body_summary->get_ext_root_scan_seq(), | |
| 2132 body_summary->get_mark_stack_scan_seq(), | |
| 2133 body_summary->get_scan_rs_seq(), | |
| 2134 body_summary->get_obj_copy_seq(), | |
| 2135 body_summary->get_termination_seq() | |
| 2136 }; | |
| 2137 NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), | |
| 1779 | 2138 6, other_parts); |
| 342 | 2139 check_other_times(2, body_summary->get_parallel_other_seq(), |
| 2140 &calc_other_times_ms); | |
| 2141 } | |
| 2142 print_summary(1, "Mark Closure", body_summary->get_mark_closure_seq()); | |
| 2143 print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); | |
| 2144 } else { | |
| 2145 print_summary(1, "Update RS", body_summary->get_update_rs_seq()); | |
| 2146 print_summary(1, "Ext Root Scanning", | |
| 2147 body_summary->get_ext_root_scan_seq()); | |
| 2148 print_summary(1, "Mark Stack Scanning", | |
| 2149 body_summary->get_mark_stack_scan_seq()); | |
| 2150 print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); | |
| 2151 print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); | |
| 2152 } | |
| 2153 } | |
| 2154 print_summary(1, "Other", summary->get_other_seq()); | |
| 2155 { | |
| 1779 | 2156 if (body_summary != NULL) { |
| 2157 NumberSeq calc_other_times_ms; | |
| 2158 if (parallel) { | |
| 2159 // parallel | |
| 2160 NumberSeq* other_parts[] = { | |
| 2161 body_summary->get_satb_drain_seq(), | |
| 2162 body_summary->get_parallel_seq(), | |
| 2163 body_summary->get_clear_ct_seq() | |
| 2164 }; | |
| 2165 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
| 2166 3, other_parts); | |
| 2167 } else { | |
| 2168 // serial | |
| 2169 NumberSeq* other_parts[] = { | |
| 2170 body_summary->get_satb_drain_seq(), | |
| 2171 body_summary->get_update_rs_seq(), | |
| 2172 body_summary->get_ext_root_scan_seq(), | |
| 2173 body_summary->get_mark_stack_scan_seq(), | |
| 2174 body_summary->get_scan_rs_seq(), | |
| 2175 body_summary->get_obj_copy_seq() | |
| 2176 }; | |
| 2177 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
| 2178 6, other_parts); | |
| 2179 } | |
| 2180 check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); | |
| 342 | 2181 } |
| 2182 } | |
| 2183 } else { | |
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2184 LineBuffer(1).append_and_print_cr("none"); |
| 342 | 2185 } |
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2186 LineBuffer(0).append_and_print_cr(""); |
| 342 | 2187 } |
| 2188 | |
| 2189 void G1CollectorPolicy::print_tracing_info() const { | |
| 2190 if (TraceGen0Time) { | |
| 2191 gclog_or_tty->print_cr("ALL PAUSES"); | |
| 2192 print_summary_sd(0, "Total", _all_pause_times_ms); | |
| 2193 gclog_or_tty->print_cr(""); | |
| 2194 gclog_or_tty->print_cr(""); | |
| 2195 gclog_or_tty->print_cr(" Full Young GC Pauses: %8d", _full_young_pause_num); | |
| 2196 gclog_or_tty->print_cr(" Partial Young GC Pauses: %8d", _partial_young_pause_num); | |
| 2197 gclog_or_tty->print_cr(""); | |
| 2198 | |
| 677 | 2199 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
| 2200 print_summary(_summary); | |
| 342 | 2201 |
| 2202 gclog_or_tty->print_cr("MISC"); | |
| 2203 print_summary_sd(0, "Stop World", _all_stop_world_times_ms); | |
| 2204 print_summary_sd(0, "Yields", _all_yield_times_ms); | |
| 2205 for (int i = 0; i < _aux_num; ++i) { | |
| 2206 if (_all_aux_times_ms[i].num() > 0) { | |
| 2207 char buffer[96]; | |
| 2208 sprintf(buffer, "Aux%d", i); | |
| 2209 print_summary_sd(0, buffer, &_all_aux_times_ms[i]); | |
| 2210 } | |
| 2211 } | |
| 2212 | |
| 2213 size_t all_region_num = _region_num_young + _region_num_tenured; | |
| 2214 gclog_or_tty->print_cr(" New Regions %8d, Young %8d (%6.2lf%%), " | |
| 2215 "Tenured %8d (%6.2lf%%)", | |
| 2216 all_region_num, | |
| 2217 _region_num_young, | |
| 2218 (double) _region_num_young / (double) all_region_num * 100.0, | |
| 2219 _region_num_tenured, | |
| 2220 (double) _region_num_tenured / (double) all_region_num * 100.0); | |
| 2221 } | |
| 2222 if (TraceGen1Time) { | |
| 2223 if (_all_full_gc_times_ms->num() > 0) { | |
| 2224 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", | |
| 2225 _all_full_gc_times_ms->num(), | |
| 2226 _all_full_gc_times_ms->sum() / 1000.0); | |
| 2227 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); | |
| 2228 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", | |
| 2229 _all_full_gc_times_ms->sd(), | |
| 2230 _all_full_gc_times_ms->maximum()); | |
| 2231 } | |
| 2232 } | |
| 2233 } | |
| 2234 | |
| 2235 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
| 2236 #ifndef PRODUCT | |
| 2237 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
| 2238 // add this call for any other surv rate groups | |
| 2239 #endif // PRODUCT | |
| 2240 } | |
| 2241 | |
| 1973 | 2242 void |
| 2243 G1CollectorPolicy::update_region_num(bool young) { | |
| 2244 if (young) { | |
| 342 | 2245 ++_region_num_young; |
| 2246 } else { | |
| 2247 ++_region_num_tenured; | |
| 2248 } | |
| 2249 } | |
| 2250 | |
| 2251 #ifndef PRODUCT | |
| 2252 // for debugging, bit of a hack... | |
| 2253 static char* | |
| 2254 region_num_to_mbs(int length) { | |
| 2255 static char buffer[64]; | |
| 2256 double bytes = (double) (length * HeapRegion::GrainBytes); | |
| 2257 double mbs = bytes / (double) (1024 * 1024); | |
| 2258 sprintf(buffer, "%7.2lfMB", mbs); | |
| 2259 return buffer; | |
| 2260 } | |
| 2261 #endif // PRODUCT | |
| 2262 | |
| 545 | 2263 size_t G1CollectorPolicy::max_regions(int purpose) { |
| 342 | 2264 switch (purpose) { |
| 2265 case GCAllocForSurvived: | |
| 545 | 2266 return _max_survivor_regions; |
| 342 | 2267 case GCAllocForTenured: |
| 545 | 2268 return REGIONS_UNLIMITED; |
| 342 | 2269 default: |
| 545 | 2270 ShouldNotReachHere(); |
| 2271 return REGIONS_UNLIMITED; | |
| 342 | 2272 }; |
| 2273 } | |
| 2274 | |
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2275 void G1CollectorPolicy::calculate_max_gc_locker_expansion() { |
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2276 size_t expansion_region_num = 0; |
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2277 if (GCLockerEdenExpansionPercent > 0) { |
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2278 double perc = (double) GCLockerEdenExpansionPercent / 100.0; |
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2279 double expansion_region_num_d = perc * (double) _young_list_target_length; |
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2280 // We use ceiling so that if expansion_region_num_d is > 0.0 (but |
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2281 // less than 1.0) we'll get 1. |
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2282 expansion_region_num = (size_t) ceil(expansion_region_num_d); |
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2283 } else { |
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2284 assert(expansion_region_num == 0, "sanity"); |
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2285 } |
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2286 _young_list_max_length = _young_list_target_length + expansion_region_num; |
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2287 assert(_young_list_target_length <= _young_list_max_length, "post-condition"); |
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2288 } |
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2289 |
| 545 | 2290 // Calculates survivor space parameters. |
| 2291 void G1CollectorPolicy::calculate_survivors_policy() | |
| 2292 { | |
| 2293 if (G1FixedSurvivorSpaceSize == 0) { | |
| 2294 _max_survivor_regions = _young_list_target_length / SurvivorRatio; | |
| 2295 } else { | |
|
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2296 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
| 545 | 2297 } |
| 2298 | |
| 2299 if (G1FixedTenuringThreshold) { | |
| 2300 _tenuring_threshold = MaxTenuringThreshold; | |
| 2301 } else { | |
| 2302 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( | |
| 2303 HeapRegion::GrainWords * _max_survivor_regions); | |
| 2304 } | |
| 2305 } | |
| 2306 | |
| 342 | 2307 #ifndef PRODUCT |
| 2308 class HRSortIndexIsOKClosure: public HeapRegionClosure { | |
| 2309 CollectionSetChooser* _chooser; | |
| 2310 public: | |
| 2311 HRSortIndexIsOKClosure(CollectionSetChooser* chooser) : | |
| 2312 _chooser(chooser) {} | |
| 2313 | |
| 2314 bool doHeapRegion(HeapRegion* r) { | |
| 2315 if (!r->continuesHumongous()) { | |
| 2316 assert(_chooser->regionProperlyOrdered(r), "Ought to be."); | |
| 2317 } | |
| 2318 return false; | |
| 2319 } | |
| 2320 }; | |
| 2321 | |
| 2322 bool G1CollectorPolicy_BestRegionsFirst::assertMarkedBytesDataOK() { | |
| 2323 HRSortIndexIsOKClosure cl(_collectionSetChooser); | |
| 2324 _g1->heap_region_iterate(&cl); | |
| 2325 return true; | |
| 2326 } | |
| 2327 #endif | |
| 2328 | |
|
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2329 bool |
|
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2330 G1CollectorPolicy::force_initial_mark_if_outside_cycle() { |
|
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2331 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
|
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2332 if (!during_cycle) { |
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|
2333 set_initiate_conc_mark_if_possible(); |
|
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2334 return true; |
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|
2335 } else { |
|
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|
2336 return false; |
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|
2337 } |
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2338 } |
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2339 |
| 342 | 2340 void |
|
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2341 G1CollectorPolicy::decide_on_conc_mark_initiation() { |
|
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2342 // We are about to decide on whether this pause will be an |
|
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2343 // initial-mark pause. |
|
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2344 |
|
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2345 // First, during_initial_mark_pause() should not be already set. We |
|
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2346 // will set it here if we have to. However, it should be cleared by |
|
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2347 // the end of the pause (it's only set for the duration of an |
|
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2348 // initial-mark pause). |
|
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2349 assert(!during_initial_mark_pause(), "pre-condition"); |
|
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2350 |
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2351 if (initiate_conc_mark_if_possible()) { |
|
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2352 // We had noticed on a previous pause that the heap occupancy has |
|
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2353 // gone over the initiating threshold and we should start a |
|
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2354 // concurrent marking cycle. So we might initiate one. |
|
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2355 |
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2356 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2357 if (!during_cycle) { |
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2358 // The concurrent marking thread is not "during a cycle", i.e., |
|
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2359 // it has completed the last one. So we can go ahead and |
|
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2360 // initiate a new cycle. |
|
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2361 |
|
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|
2362 set_during_initial_mark_pause(); |
|
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2363 |
|
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2364 // And we can now clear initiate_conc_mark_if_possible() as |
|
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2365 // we've already acted on it. |
|
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2366 clear_initiate_conc_mark_if_possible(); |
|
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2367 } else { |
|
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2368 // The concurrent marking thread is still finishing up the |
|
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2369 // previous cycle. If we start one right now the two cycles |
|
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2370 // overlap. In particular, the concurrent marking thread might |
|
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2371 // be in the process of clearing the next marking bitmap (which |
|
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|
2372 // we will use for the next cycle if we start one). Starting a |
|
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2373 // cycle now will be bad given that parts of the marking |
|
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2374 // information might get cleared by the marking thread. And we |
|
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2375 // cannot wait for the marking thread to finish the cycle as it |
|
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2376 // periodically yields while clearing the next marking bitmap |
|
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2377 // and, if it's in a yield point, it's waiting for us to |
|
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2378 // finish. So, at this point we will not start a cycle and we'll |
|
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2379 // let the concurrent marking thread complete the last one. |
|
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2380 } |
|
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2381 } |
|
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2382 } |
|
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2383 |
|
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|
2384 void |
| 342 | 2385 G1CollectorPolicy_BestRegionsFirst:: |
| 2386 record_collection_pause_start(double start_time_sec, size_t start_used) { | |
| 2387 G1CollectorPolicy::record_collection_pause_start(start_time_sec, start_used); | |
| 2388 } | |
| 2389 | |
| 2390 class KnownGarbageClosure: public HeapRegionClosure { | |
| 2391 CollectionSetChooser* _hrSorted; | |
| 2392 | |
| 2393 public: | |
| 2394 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
| 2395 _hrSorted(hrSorted) | |
| 2396 {} | |
| 2397 | |
| 2398 bool doHeapRegion(HeapRegion* r) { | |
| 2399 // We only include humongous regions in collection | |
| 2400 // sets when concurrent mark shows that their contained object is | |
| 2401 // unreachable. | |
| 2402 | |
| 2403 // Do we have any marking information for this region? | |
| 2404 if (r->is_marked()) { | |
| 2405 // We don't include humongous regions in collection | |
| 2406 // sets because we collect them immediately at the end of a marking | |
| 2407 // cycle. We also don't include young regions because we *must* | |
| 2408 // include them in the next collection pause. | |
| 2409 if (!r->isHumongous() && !r->is_young()) { | |
| 2410 _hrSorted->addMarkedHeapRegion(r); | |
| 2411 } | |
| 2412 } | |
| 2413 return false; | |
| 2414 } | |
| 2415 }; | |
| 2416 | |
| 2417 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
| 2418 CollectionSetChooser* _hrSorted; | |
| 2419 jint _marked_regions_added; | |
| 2420 jint _chunk_size; | |
| 2421 jint _cur_chunk_idx; | |
| 2422 jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) | |
| 2423 int _worker; | |
| 2424 int _invokes; | |
| 2425 | |
| 2426 void get_new_chunk() { | |
| 2427 _cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size); | |
| 2428 _cur_chunk_end = _cur_chunk_idx + _chunk_size; | |
| 2429 } | |
| 2430 void add_region(HeapRegion* r) { | |
| 2431 if (_cur_chunk_idx == _cur_chunk_end) { | |
| 2432 get_new_chunk(); | |
| 2433 } | |
| 2434 assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); | |
| 2435 _hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r); | |
| 2436 _marked_regions_added++; | |
| 2437 _cur_chunk_idx++; | |
| 2438 } | |
| 2439 | |
| 2440 public: | |
| 2441 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
| 2442 jint chunk_size, | |
| 2443 int worker) : | |
| 2444 _hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker), | |
| 2445 _marked_regions_added(0), _cur_chunk_idx(0), _cur_chunk_end(0), | |
| 2446 _invokes(0) | |
| 2447 {} | |
| 2448 | |
| 2449 bool doHeapRegion(HeapRegion* r) { | |
| 2450 // We only include humongous regions in collection | |
| 2451 // sets when concurrent mark shows that their contained object is | |
| 2452 // unreachable. | |
| 2453 _invokes++; | |
| 2454 | |
| 2455 // Do we have any marking information for this region? | |
| 2456 if (r->is_marked()) { | |
| 2457 // We don't include humongous regions in collection | |
| 2458 // sets because we collect them immediately at the end of a marking | |
| 2459 // cycle. | |
| 2460 // We also do not include young regions in collection sets | |
| 2461 if (!r->isHumongous() && !r->is_young()) { | |
| 2462 add_region(r); | |
| 2463 } | |
| 2464 } | |
| 2465 return false; | |
| 2466 } | |
| 2467 jint marked_regions_added() { return _marked_regions_added; } | |
| 2468 int invokes() { return _invokes; } | |
| 2469 }; | |
| 2470 | |
| 2471 class ParKnownGarbageTask: public AbstractGangTask { | |
| 2472 CollectionSetChooser* _hrSorted; | |
| 2473 jint _chunk_size; | |
| 2474 G1CollectedHeap* _g1; | |
| 2475 public: | |
| 2476 ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) : | |
| 2477 AbstractGangTask("ParKnownGarbageTask"), | |
| 2478 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
| 2479 _g1(G1CollectedHeap::heap()) | |
| 2480 {} | |
| 2481 | |
| 2482 void work(int i) { | |
| 2483 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size, i); | |
| 2484 // Back to zero for the claim value. | |
| 355 | 2485 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, i, |
| 2486 HeapRegion::InitialClaimValue); | |
| 342 | 2487 jint regions_added = parKnownGarbageCl.marked_regions_added(); |
| 2488 _hrSorted->incNumMarkedHeapRegions(regions_added); | |
| 2489 if (G1PrintParCleanupStats) { | |
|
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2490 gclog_or_tty->print_cr(" Thread %d called %d times, added %d regions to list.", |
| 342 | 2491 i, parKnownGarbageCl.invokes(), regions_added); |
| 2492 } | |
| 2493 } | |
| 2494 }; | |
| 2495 | |
| 2496 void | |
| 2497 G1CollectorPolicy_BestRegionsFirst:: | |
| 2498 record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
| 2499 size_t max_live_bytes) { | |
| 2500 double start; | |
| 2501 if (G1PrintParCleanupStats) start = os::elapsedTime(); | |
| 2502 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
| 2503 | |
| 2504 _collectionSetChooser->clearMarkedHeapRegions(); | |
| 2505 double clear_marked_end; | |
| 2506 if (G1PrintParCleanupStats) { | |
| 2507 clear_marked_end = os::elapsedTime(); | |
| 2508 gclog_or_tty->print_cr(" clear marked regions + work1: %8.3f ms.", | |
| 2509 (clear_marked_end - start)*1000.0); | |
| 2510 } | |
|
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2511 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 2512 const size_t OverpartitionFactor = 4; |
|
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2513 const size_t MinWorkUnit = 8; |
|
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|
2514 const size_t WorkUnit = |
| 342 | 2515 MAX2(_g1->n_regions() / (ParallelGCThreads * OverpartitionFactor), |
|
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|
2516 MinWorkUnit); |
| 342 | 2517 _collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(), |
|
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|
2518 WorkUnit); |
| 342 | 2519 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
|
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2520 (int) WorkUnit); |
| 342 | 2521 _g1->workers()->run_task(&parKnownGarbageTask); |
| 355 | 2522 |
| 2523 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 2524 "sanity check"); | |
| 342 | 2525 } else { |
| 2526 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
| 2527 _g1->heap_region_iterate(&knownGarbagecl); | |
| 2528 } | |
| 2529 double known_garbage_end; | |
| 2530 if (G1PrintParCleanupStats) { | |
| 2531 known_garbage_end = os::elapsedTime(); | |
| 2532 gclog_or_tty->print_cr(" compute known garbage: %8.3f ms.", | |
| 2533 (known_garbage_end - clear_marked_end)*1000.0); | |
| 2534 } | |
| 2535 _collectionSetChooser->sortMarkedHeapRegions(); | |
| 2536 double sort_end; | |
| 2537 if (G1PrintParCleanupStats) { | |
| 2538 sort_end = os::elapsedTime(); | |
| 2539 gclog_or_tty->print_cr(" sorting: %8.3f ms.", | |
| 2540 (sort_end - known_garbage_end)*1000.0); | |
| 2541 } | |
| 2542 | |
| 2543 record_concurrent_mark_cleanup_end_work2(); | |
| 2544 double work2_end; | |
| 2545 if (G1PrintParCleanupStats) { | |
| 2546 work2_end = os::elapsedTime(); | |
| 2547 gclog_or_tty->print_cr(" work2: %8.3f ms.", | |
| 2548 (work2_end - sort_end)*1000.0); | |
| 2549 } | |
| 2550 } | |
| 2551 | |
|
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2552 // Add the heap region at the head of the non-incremental collection set |
| 342 | 2553 void G1CollectorPolicy:: |
| 2554 add_to_collection_set(HeapRegion* hr) { | |
|
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2555 assert(_inc_cset_build_state == Active, "Precondition"); |
|
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2556 assert(!hr->is_young(), "non-incremental add of young region"); |
|
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2557 |
| 342 | 2558 if (_g1->mark_in_progress()) |
| 2559 _g1->concurrent_mark()->registerCSetRegion(hr); | |
| 2560 | |
|
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|
2561 assert(!hr->in_collection_set(), "should not already be in the CSet"); |
| 342 | 2562 hr->set_in_collection_set(true); |
| 2563 hr->set_next_in_collection_set(_collection_set); | |
| 2564 _collection_set = hr; | |
| 2565 _collection_set_size++; | |
| 2566 _collection_set_bytes_used_before += hr->used(); | |
| 526 | 2567 _g1->register_region_with_in_cset_fast_test(hr); |
| 342 | 2568 } |
| 2569 | |
|
1394
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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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|
2570 // Initialize the per-collection-set information |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2571 void G1CollectorPolicy::start_incremental_cset_building() { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2572 assert(_inc_cset_build_state == Inactive, "Precondition"); |
|
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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
|
2573 |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2574 _inc_cset_head = NULL; |
|
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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
|
2575 _inc_cset_tail = NULL; |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2576 _inc_cset_size = 0; |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2577 _inc_cset_bytes_used_before = 0; |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2578 |
|
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2579 _inc_cset_young_index = 0; |
|
1394
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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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|
2580 |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2581 _inc_cset_max_finger = 0; |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2582 _inc_cset_recorded_young_bytes = 0; |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2583 _inc_cset_recorded_rs_lengths = 0; |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2584 _inc_cset_predicted_elapsed_time_ms = 0; |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2585 _inc_cset_predicted_bytes_to_copy = 0; |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2586 _inc_cset_build_state = Active; |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2587 } |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2588 |
|
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
|
2589 void G1CollectorPolicy::add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length) { |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2590 // This routine is used when: |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2591 // * adding survivor regions to the incremental cset at the end of an |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2592 // evacuation pause, |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2593 // * adding the current allocation region to 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
|
2594 // when it is retired, and |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2595 // * updating existing policy information for a region in the |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2596 // incremental cset via young list RSet sampling. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2597 // Therefore this routine may be called at a safepoint by the |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2598 // VM thread, or in-between safepoints by mutator threads (when |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2599 // retiring the current allocation region) or a concurrent |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2600 // refine thread (RSet sampling). |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2601 |
|
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
|
2602 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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diff
changeset
|
2603 size_t used_bytes = hr->used(); |
|
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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
|
2604 |
|
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
|
2605 _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
|
2606 _inc_cset_predicted_elapsed_time_ms += region_elapsed_time_ms; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2607 |
|
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
|
2608 _inc_cset_bytes_used_before += used_bytes; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2609 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2610 // 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
|
2611 // 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
|
2612 // 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
|
2613 // rset sampling code |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2614 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:
1391
diff
changeset
|
2615 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
|
2616 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2617 #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
|
2618 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:
1391
diff
changeset
|
2619 _inc_cset_predicted_bytes_to_copy += bytes_to_copy; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2620 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2621 // 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:
1391
diff
changeset
|
2622 _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
|
2623 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2624 // 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:
1391
diff
changeset
|
2625 // 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
|
2626 // 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
johnc
parents:
1391
diff
changeset
|
2627 // rset sampling code |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2628 hr->set_predicted_bytes_to_copy(bytes_to_copy); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2629 #endif // PREDICTIONS_VERBOSE |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2630 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2631 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2632 void G1CollectorPolicy::remove_from_incremental_cset_info(HeapRegion* hr) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2633 // 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
johnc
parents:
1391
diff
changeset
|
2634 // 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
johnc
parents:
1391
diff
changeset
|
2635 // 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
johnc
parents:
1391
diff
changeset
|
2636 // 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
johnc
parents:
1391
diff
changeset
|
2637 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2638 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
johnc
parents:
1391
diff
changeset
|
2639 assert(hr->is_young(), "it should be"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2640 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2641 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:
1391
diff
changeset
|
2642 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:
1391
diff
changeset
|
2643 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
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parents:
1391
diff
changeset
|
2644 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2645 // Subtract the old recorded/predicted policy information for |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2646 // the given heap region from the collection set info. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2647 _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
|
2648 _inc_cset_predicted_elapsed_time_ms -= old_elapsed_time_ms; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2649 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2650 _inc_cset_bytes_used_before -= used_bytes; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2651 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2652 // Clear the values cached in the heap region |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2653 hr->set_recorded_rs_length(0); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2654 hr->set_predicted_elapsed_time_ms(0); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2655 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2656 #if PREDICTIONS_VERBOSE |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2657 size_t old_predicted_bytes_to_copy = hr->predicted_bytes_to_copy(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2658 _inc_cset_predicted_bytes_to_copy -= old_predicted_bytes_to_copy; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2659 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2660 // Subtract the number of bytes used in this region |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2661 _inc_cset_recorded_young_bytes -= used_bytes; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2662 |
|
1316cec51b4d
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1391
diff
changeset
|
2663 // Clear the values cached in the heap region |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2664 hr->set_predicted_bytes_to_copy(0); |
|
1316cec51b4d
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parents:
1391
diff
changeset
|
2665 #endif // PREDICTIONS_VERBOSE |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2666 } |
|
1316cec51b4d
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1391
diff
changeset
|
2667 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2668 void G1CollectorPolicy::update_incremental_cset_info(HeapRegion* hr, size_t new_rs_length) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2669 // Update the collection set information that is dependent on the new RS length |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2670 assert(hr->is_young(), "Precondition"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2671 |
|
1316cec51b4d
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1391
diff
changeset
|
2672 remove_from_incremental_cset_info(hr); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2673 add_to_incremental_cset_info(hr, new_rs_length); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2674 } |
|
1316cec51b4d
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parents:
1391
diff
changeset
|
2675 |
|
1316cec51b4d
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parents:
1391
diff
changeset
|
2676 void G1CollectorPolicy::add_region_to_incremental_cset_common(HeapRegion* hr) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2677 assert( hr->is_young(), "invariant"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2678 assert( hr->young_index_in_cset() == -1, "invariant" ); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2679 assert(_inc_cset_build_state == Active, "Precondition"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2680 |
|
1316cec51b4d
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parents:
1391
diff
changeset
|
2681 // We need to clear and set the cached recorded/cached collection set |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2682 // information in the heap region here (before the region gets added |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2683 // to the collection set). An individual heap region's cached values |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2684 // are calculated, aggregated with the policy collection set info, |
|
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changeset
|
2685 // and cached in the heap region here (initially) and (subsequently) |
|
1316cec51b4d
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parents:
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changeset
|
2686 // by the Young List sampling code. |
|
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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
|
2687 |
|
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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
|
2688 size_t rs_length = hr->rem_set()->occupied(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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changeset
|
2689 add_to_incremental_cset_info(hr, rs_length); |
|
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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
|
2690 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2691 HeapWord* hr_end = hr->end(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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changeset
|
2692 _inc_cset_max_finger = MAX2(_inc_cset_max_finger, hr_end); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2693 |
|
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
|
2694 assert(!hr->in_collection_set(), "invariant"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2695 hr->set_in_collection_set(true); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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changeset
|
2696 assert( hr->next_in_collection_set() == NULL, "invariant"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2697 |
|
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 _inc_cset_size++; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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changeset
|
2699 _g1->register_region_with_in_cset_fast_test(hr); |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2700 |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2701 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
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changeset
|
2702 ++_inc_cset_young_index; |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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changeset
|
2703 } |
|
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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
|
2704 |
|
1316cec51b4d
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diff
changeset
|
2705 // Add the region at the RHS of the incremental cset |
|
1316cec51b4d
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parents:
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diff
changeset
|
2706 void G1CollectorPolicy::add_region_to_incremental_cset_rhs(HeapRegion* hr) { |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2707 // We should only ever be appending survivors at the end of a pause |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2708 assert( hr->is_survivor(), "Logic"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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changeset
|
2709 |
|
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diff
changeset
|
2710 // 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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parents:
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diff
changeset
|
2711 add_region_to_incremental_cset_common(hr); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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changeset
|
2712 |
|
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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
|
2713 // Now add the region at the right hand side |
|
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
|
2714 if (_inc_cset_tail == NULL) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2715 assert(_inc_cset_head == NULL, "invariant"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2716 _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
|
2717 } else { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2718 _inc_cset_tail->set_next_in_collection_set(hr); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2719 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2720 _inc_cset_tail = hr; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2721 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2722 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2723 // Add the region to the LHS of the incremental cset |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2724 void G1CollectorPolicy::add_region_to_incremental_cset_lhs(HeapRegion* hr) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2725 // Survivors should be added to the RHS at the end of a pause |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2726 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
|
2727 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2728 // Do the 'common' stuff |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2729 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
|
2730 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2731 // Add the region at the left hand side |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2732 hr->set_next_in_collection_set(_inc_cset_head); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2733 if (_inc_cset_head == NULL) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2734 assert(_inc_cset_tail == NULL, "Invariant"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2735 _inc_cset_tail = hr; |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2736 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2737 _inc_cset_head = hr; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2738 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2739 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2740 #ifndef PRODUCT |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2741 void G1CollectorPolicy::print_collection_set(HeapRegion* list_head, outputStream* st) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2742 assert(list_head == inc_cset_head() || list_head == collection_set(), "must be"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2743 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2744 st->print_cr("\nCollection_set:"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2745 HeapRegion* csr = list_head; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2746 while (csr != NULL) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2747 HeapRegion* next = csr->next_in_collection_set(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2748 assert(csr->in_collection_set(), "bad CS"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2749 st->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2750 "age: %4d, y: %d, surv: %d", |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2751 csr->bottom(), csr->end(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2752 csr->top(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2753 csr->prev_top_at_mark_start(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2754 csr->next_top_at_mark_start(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2755 csr->top_at_conc_mark_count(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2756 csr->age_in_surv_rate_group_cond(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2757 csr->is_young(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2758 csr->is_survivor()); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2759 csr = next; |
|
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 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2762 #endif // !PRODUCT |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2763 |
| 1707 | 2764 void |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2765 G1CollectorPolicy_BestRegionsFirst::choose_collection_set( |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2766 double target_pause_time_ms) { |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2767 // Set this here - in case we're not doing young collections. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2768 double non_young_start_time_sec = os::elapsedTime(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2769 |
| 342 | 2770 start_recording_regions(); |
| 2771 | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2772 guarantee(target_pause_time_ms > 0.0, |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2773 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
|
2774 target_pause_time_ms)); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2775 guarantee(_collection_set == NULL, "Precondition"); |
| 342 | 2776 |
| 2777 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
| 2778 double predicted_pause_time_ms = base_time_ms; | |
| 2779 | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2780 double time_remaining_ms = target_pause_time_ms - base_time_ms; |
| 342 | 2781 |
| 2782 // the 10% and 50% values are arbitrary... | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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parents:
1611
diff
changeset
|
2783 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
|
2784 time_remaining_ms = 0.50 * target_pause_time_ms; |
| 342 | 2785 _within_target = false; |
| 2786 } else { | |
| 2787 _within_target = true; | |
| 2788 } | |
| 2789 | |
| 2790 // We figure out the number of bytes available for future to-space. | |
| 2791 // For new regions without marking information, we must assume the | |
| 2792 // worst-case of complete survival. If we have marking information for a | |
| 2793 // region, we can bound the amount of live data. We can add a number of | |
| 2794 // such regions, as long as the sum of the live data bounds does not | |
| 2795 // exceed the available evacuation space. | |
| 2796 size_t max_live_bytes = _g1->free_regions() * HeapRegion::GrainBytes; | |
| 2797 | |
| 2798 size_t expansion_bytes = | |
| 2799 _g1->expansion_regions() * HeapRegion::GrainBytes; | |
| 2800 | |
| 677 | 2801 _collection_set_bytes_used_before = 0; |
| 2802 _collection_set_size = 0; | |
| 342 | 2803 |
| 2804 // Adjust for expansion and slop. | |
| 2805 max_live_bytes = max_live_bytes + expansion_bytes; | |
| 2806 | |
| 2807 HeapRegion* hr; | |
|
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2808 double young_start_time_sec = os::elapsedTime(); |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2809 |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2810 if (G1PolicyVerbose > 0) { |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2811 gclog_or_tty->print_cr("Adding %d young regions to the CSet", |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2812 _g1->young_list()->length()); |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2813 } |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2814 |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2815 _young_cset_length = 0; |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2816 _last_young_gc_full = full_young_gcs() ? true : false; |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2817 |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2818 if (_last_young_gc_full) |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2819 ++_full_young_pause_num; |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2820 else |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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2821 ++_partial_young_pause_num; |
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2822 |
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2823 // The young list is laid with the survivor regions from the previous |
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2824 // pause are appended to the RHS of the young list, i.e. |
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2825 // [Newly Young Regions ++ Survivors from last pause]. |
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2826 |
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2827 hr = _g1->young_list()->first_survivor_region(); |
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2828 while (hr != NULL) { |
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2829 assert(hr->is_survivor(), "badly formed young list"); |
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2830 hr->set_young(); |
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2831 hr = hr->get_next_young_region(); |
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2832 } |
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2833 |
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2834 // Clear the fields that point to the survivor list - they are |
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2835 // all young now. |
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2836 _g1->young_list()->clear_survivors(); |
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2837 |
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2838 if (_g1->mark_in_progress()) |
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2839 _g1->concurrent_mark()->register_collection_set_finger(_inc_cset_max_finger); |
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2840 |
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2841 _young_cset_length = _inc_cset_young_index; |
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2842 _collection_set = _inc_cset_head; |
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2843 _collection_set_size = _inc_cset_size; |
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2844 _collection_set_bytes_used_before = _inc_cset_bytes_used_before; |
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2845 |
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2846 // For young regions in the collection set, we assume the worst |
|
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2847 // case of complete survival |
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2848 max_live_bytes -= _inc_cset_size * HeapRegion::GrainBytes; |
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2849 |
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2850 time_remaining_ms -= _inc_cset_predicted_elapsed_time_ms; |
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2851 predicted_pause_time_ms += _inc_cset_predicted_elapsed_time_ms; |
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2852 |
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2853 // The number of recorded young regions is the incremental |
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2854 // collection set's current size |
|
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2855 set_recorded_young_regions(_inc_cset_size); |
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2856 set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths); |
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2857 set_recorded_young_bytes(_inc_cset_recorded_young_bytes); |
|
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2858 #if PREDICTIONS_VERBOSE |
|
3867
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2859 set_predicted_bytes_to_copy(_inc_cset_predicted_bytes_to_copy); |
|
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2860 #endif // PREDICTIONS_VERBOSE |
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2861 |
|
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2862 if (G1PolicyVerbose > 0) { |
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2863 gclog_or_tty->print_cr(" Added " PTR_FORMAT " Young Regions to CS.", |
|
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2864 _inc_cset_size); |
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2865 gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", |
|
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2866 max_live_bytes/K); |
| 342 | 2867 } |
| 2868 | |
|
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2869 assert(_inc_cset_size == _g1->young_list()->length(), "Invariant"); |
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2870 |
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2871 double young_end_time_sec = os::elapsedTime(); |
|
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2872 _recorded_young_cset_choice_time_ms = |
|
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2873 (young_end_time_sec - young_start_time_sec) * 1000.0; |
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2874 |
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2875 // We are doing young collections so reset this. |
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2876 non_young_start_time_sec = young_end_time_sec; |
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2877 |
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2878 if (!full_young_gcs()) { |
| 342 | 2879 bool should_continue = true; |
| 2880 NumberSeq seq; | |
| 2881 double avg_prediction = 100000000000000000.0; // something very large | |
|
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2882 |
| 342 | 2883 do { |
| 2884 hr = _collectionSetChooser->getNextMarkedRegion(time_remaining_ms, | |
| 2885 avg_prediction); | |
| 677 | 2886 if (hr != NULL) { |
| 342 | 2887 double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
| 2888 time_remaining_ms -= predicted_time_ms; | |
| 2889 predicted_pause_time_ms += predicted_time_ms; | |
| 2890 add_to_collection_set(hr); | |
|
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2891 record_non_young_cset_region(hr); |
| 342 | 2892 max_live_bytes -= MIN2(hr->max_live_bytes(), max_live_bytes); |
| 2893 if (G1PolicyVerbose > 0) { | |
| 2894 gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", | |
| 2895 max_live_bytes/K); | |
| 2896 } | |
| 2897 seq.add(predicted_time_ms); | |
| 2898 avg_prediction = seq.avg() + seq.sd(); | |
| 2899 } | |
| 2900 should_continue = | |
| 2901 ( hr != NULL) && | |
| 2902 ( (adaptive_young_list_length()) ? time_remaining_ms > 0.0 | |
| 2903 : _collection_set_size < _young_list_fixed_length ); | |
| 2904 } while (should_continue); | |
| 2905 | |
| 2906 if (!adaptive_young_list_length() && | |
| 2907 _collection_set_size < _young_list_fixed_length) | |
| 2908 _should_revert_to_full_young_gcs = true; | |
| 2909 } | |
| 2910 | |
|
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|
2911 stop_incremental_cset_building(); |
|
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2912 |
| 342 | 2913 count_CS_bytes_used(); |
| 2914 | |
| 2915 end_recording_regions(); | |
| 2916 | |
| 2917 double non_young_end_time_sec = os::elapsedTime(); | |
| 2918 _recorded_non_young_cset_choice_time_ms = | |
| 2919 (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; | |
| 2920 } | |
| 2921 | |
| 2922 void G1CollectorPolicy_BestRegionsFirst::record_full_collection_end() { | |
| 2923 G1CollectorPolicy::record_full_collection_end(); | |
| 2924 _collectionSetChooser->updateAfterFullCollection(); | |
| 2925 } | |
| 2926 | |
| 2927 void G1CollectorPolicy_BestRegionsFirst:: | |
| 2928 expand_if_possible(size_t numRegions) { | |
| 2929 size_t expansion_bytes = numRegions * HeapRegion::GrainBytes; | |
| 2930 _g1->expand(expansion_bytes); | |
| 2931 } | |
| 2932 | |
| 2933 void G1CollectorPolicy_BestRegionsFirst:: | |
| 1707 | 2934 record_collection_pause_end() { |
| 2935 G1CollectorPolicy::record_collection_pause_end(); | |
| 342 | 2936 assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end."); |
| 2937 } |