Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.hpp @ 4834:6a78aa6ac1ff
7132311: G1: assert((s == klass->oop_size(this)) || (Universe::heap()->is_gc_active() && ((is_typeArray()...
Summary: Move the check for when to call collect() to before we do a humongous object allocation
Reviewed-by: stefank, tonyp
| author | brutisso |
|---|---|
| date | Mon, 23 Jan 2012 20:36:16 +0100 |
| parents | 9509c20bba28 |
| children | eff609af17d7 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2012, 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 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTORPOLICY_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTORPOLICY_HPP | |
| 27 | |
| 28 #include "gc_implementation/g1/collectionSetChooser.hpp" | |
| 29 #include "gc_implementation/g1/g1MMUTracker.hpp" | |
| 30 #include "memory/collectorPolicy.hpp" | |
| 31 | |
| 342 | 32 // A G1CollectorPolicy makes policy decisions that determine the |
| 33 // characteristics of the collector. Examples include: | |
| 34 // * choice of collection set. | |
| 35 // * when to collect. | |
| 36 | |
| 37 class HeapRegion; | |
| 38 class CollectionSetChooser; | |
| 39 | |
| 40 // Yes, this is a bit unpleasant... but it saves replicating the same thing | |
| 41 // over and over again and introducing subtle problems through small typos and | |
| 42 // cutting and pasting mistakes. The macros below introduces a number | |
| 43 // sequnce into the following two classes and the methods that access it. | |
| 44 | |
| 45 #define define_num_seq(name) \ | |
| 46 private: \ | |
| 47 NumberSeq _all_##name##_times_ms; \ | |
| 48 public: \ | |
| 49 void record_##name##_time_ms(double ms) { \ | |
| 50 _all_##name##_times_ms.add(ms); \ | |
| 51 } \ | |
| 52 NumberSeq* get_##name##_seq() { \ | |
| 53 return &_all_##name##_times_ms; \ | |
| 54 } | |
| 55 | |
| 56 class MainBodySummary; | |
| 57 | |
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58 class PauseSummary: public CHeapObj { |
| 342 | 59 define_num_seq(total) |
| 60 define_num_seq(other) | |
| 61 | |
| 62 public: | |
| 63 virtual MainBodySummary* main_body_summary() { return NULL; } | |
| 64 }; | |
| 65 | |
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66 class MainBodySummary: public CHeapObj { |
| 342 | 67 define_num_seq(satb_drain) // optional |
| 68 define_num_seq(parallel) // parallel only | |
| 69 define_num_seq(ext_root_scan) | |
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70 define_num_seq(satb_filtering) |
| 342 | 71 define_num_seq(update_rs) |
| 72 define_num_seq(scan_rs) | |
| 73 define_num_seq(obj_copy) | |
| 74 define_num_seq(termination) // parallel only | |
| 75 define_num_seq(parallel_other) // parallel only | |
| 76 define_num_seq(mark_closure) | |
| 4023 | 77 define_num_seq(clear_ct) |
| 342 | 78 }; |
| 79 | |
| 677 | 80 class Summary: public PauseSummary, |
| 81 public MainBodySummary { | |
| 342 | 82 public: |
| 83 virtual MainBodySummary* main_body_summary() { return this; } | |
| 84 }; | |
| 85 | |
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86 // There are three command line options related to the young gen size: |
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87 // NewSize, MaxNewSize and NewRatio (There is also -Xmn, but that is |
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88 // just a short form for NewSize==MaxNewSize). G1 will use its internal |
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89 // heuristics to calculate the actual young gen size, so these options |
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90 // basically only limit the range within which G1 can pick a young gen |
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91 // size. Also, these are general options taking byte sizes. G1 will |
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92 // internally work with a number of regions instead. So, some rounding |
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93 // will occur. |
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94 // |
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95 // If nothing related to the the young gen size is set on the command |
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96 // line we should allow the young gen to be between |
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97 // G1DefaultMinNewGenPercent and G1DefaultMaxNewGenPercent of the |
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98 // heap size. This means that every time the heap size changes the |
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99 // limits for the young gen size will be updated. |
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100 // |
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101 // If only -XX:NewSize is set we should use the specified value as the |
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102 // minimum size for young gen. Still using G1DefaultMaxNewGenPercent |
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103 // of the heap as maximum. |
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104 // |
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105 // If only -XX:MaxNewSize is set we should use the specified value as the |
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106 // maximum size for young gen. Still using G1DefaultMinNewGenPercent |
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107 // of the heap as minimum. |
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108 // |
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109 // If -XX:NewSize and -XX:MaxNewSize are both specified we use these values. |
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110 // No updates when the heap size changes. There is a special case when |
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111 // NewSize==MaxNewSize. This is interpreted as "fixed" and will use a |
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112 // different heuristic for calculating the collection set when we do mixed |
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113 // collection. |
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114 // |
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115 // If only -XX:NewRatio is set we should use the specified ratio of the heap |
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116 // as both min and max. This will be interpreted as "fixed" just like the |
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117 // NewSize==MaxNewSize case above. But we will update the min and max |
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118 // everytime the heap size changes. |
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119 // |
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120 // NewSize and MaxNewSize override NewRatio. So, NewRatio is ignored if it is |
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121 // combined with either NewSize or MaxNewSize. (A warning message is printed.) |
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122 class G1YoungGenSizer : public CHeapObj { |
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123 private: |
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124 enum SizerKind { |
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125 SizerDefaults, |
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126 SizerNewSizeOnly, |
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127 SizerMaxNewSizeOnly, |
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128 SizerMaxAndNewSize, |
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129 SizerNewRatio |
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130 }; |
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131 SizerKind _sizer_kind; |
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132 size_t _min_desired_young_length; |
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133 size_t _max_desired_young_length; |
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134 bool _adaptive_size; |
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135 size_t calculate_default_min_length(size_t new_number_of_heap_regions); |
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136 size_t calculate_default_max_length(size_t new_number_of_heap_regions); |
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137 |
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138 public: |
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139 G1YoungGenSizer(); |
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140 void heap_size_changed(size_t new_number_of_heap_regions); |
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141 size_t min_desired_young_length() { |
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142 return _min_desired_young_length; |
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143 } |
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144 size_t max_desired_young_length() { |
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145 return _max_desired_young_length; |
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146 } |
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147 bool adaptive_young_list_length() { |
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148 return _adaptive_size; |
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149 } |
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150 }; |
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151 |
| 342 | 152 class G1CollectorPolicy: public CollectorPolicy { |
| 4013 | 153 private: |
| 342 | 154 // either equal to the number of parallel threads, if ParallelGCThreads |
| 155 // has been set, or 1 otherwise | |
| 156 int _parallel_gc_threads; | |
| 157 | |
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158 // The number of GC threads currently active. |
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159 uintx _no_of_gc_threads; |
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160 |
| 342 | 161 enum SomePrivateConstants { |
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162 NumPrevPausesForHeuristics = 10 |
| 342 | 163 }; |
| 164 | |
| 165 G1MMUTracker* _mmu_tracker; | |
| 166 | |
| 167 void initialize_flags(); | |
| 168 | |
| 169 void initialize_all() { | |
| 170 initialize_flags(); | |
| 171 initialize_size_info(); | |
| 172 initialize_perm_generation(PermGen::MarkSweepCompact); | |
| 173 } | |
| 174 | |
| 4013 | 175 CollectionSetChooser* _collectionSetChooser; |
| 342 | 176 |
| 177 double _cur_collection_start_sec; | |
| 178 size_t _cur_collection_pause_used_at_start_bytes; | |
| 179 size_t _cur_collection_pause_used_regions_at_start; | |
| 180 double _cur_collection_par_time_ms; | |
| 181 double _cur_satb_drain_time_ms; | |
| 182 double _cur_clear_ct_time_ms; | |
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183 double _cur_ref_proc_time_ms; |
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184 double _cur_ref_enq_time_ms; |
| 342 | 185 |
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186 #ifndef PRODUCT |
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187 // Card Table Count Cache stats |
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188 double _min_clear_cc_time_ms; // min |
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189 double _max_clear_cc_time_ms; // max |
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190 double _cur_clear_cc_time_ms; // clearing time during current pause |
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191 double _cum_clear_cc_time_ms; // cummulative clearing time |
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192 jlong _num_cc_clears; // number of times the card count cache has been cleared |
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193 #endif |
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194 |
| 342 | 195 // These exclude marking times. |
| 196 TruncatedSeq* _recent_gc_times_ms; | |
| 197 | |
| 198 TruncatedSeq* _concurrent_mark_remark_times_ms; | |
| 199 TruncatedSeq* _concurrent_mark_cleanup_times_ms; | |
| 200 | |
| 677 | 201 Summary* _summary; |
| 342 | 202 |
| 203 NumberSeq* _all_pause_times_ms; | |
| 204 NumberSeq* _all_full_gc_times_ms; | |
| 205 double _stop_world_start; | |
| 206 NumberSeq* _all_stop_world_times_ms; | |
| 207 NumberSeq* _all_yield_times_ms; | |
| 208 | |
| 209 int _aux_num; | |
| 210 NumberSeq* _all_aux_times_ms; | |
| 211 double* _cur_aux_start_times_ms; | |
| 212 double* _cur_aux_times_ms; | |
| 213 bool* _cur_aux_times_set; | |
| 214 | |
| 1611 | 215 double* _par_last_gc_worker_start_times_ms; |
| 342 | 216 double* _par_last_ext_root_scan_times_ms; |
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217 double* _par_last_satb_filtering_times_ms; |
| 342 | 218 double* _par_last_update_rs_times_ms; |
| 219 double* _par_last_update_rs_processed_buffers; | |
| 220 double* _par_last_scan_rs_times_ms; | |
| 221 double* _par_last_obj_copy_times_ms; | |
| 222 double* _par_last_termination_times_ms; | |
| 1611 | 223 double* _par_last_termination_attempts; |
| 224 double* _par_last_gc_worker_end_times_ms; | |
| 2430 | 225 double* _par_last_gc_worker_times_ms; |
| 342 | 226 |
| 4023 | 227 // Each workers 'other' time i.e. the elapsed time of the parallel |
| 228 // phase of the pause minus the sum of the individual sub-phase | |
| 229 // times for a given worker thread. | |
| 230 double* _par_last_gc_worker_other_times_ms; | |
| 231 | |
| 4710 | 232 // indicates whether we are in young or mixed GC mode |
| 233 bool _gcs_are_young; | |
| 342 | 234 |
| 235 size_t _young_list_target_length; | |
| 236 size_t _young_list_fixed_length; | |
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237 size_t _prev_eden_capacity; // used for logging |
| 342 | 238 |
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239 // The max number of regions we can extend the eden by while the GC |
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240 // locker is active. This should be >= _young_list_target_length; |
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241 size_t _young_list_max_length; |
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242 |
| 4710 | 243 bool _last_gc_was_young; |
| 342 | 244 |
| 4710 | 245 unsigned _young_pause_num; |
| 246 unsigned _mixed_pause_num; | |
| 342 | 247 |
| 248 bool _during_marking; | |
| 249 bool _in_marking_window; | |
| 250 bool _in_marking_window_im; | |
| 251 | |
| 252 SurvRateGroup* _short_lived_surv_rate_group; | |
| 253 SurvRateGroup* _survivor_surv_rate_group; | |
| 254 // add here any more surv rate groups | |
| 255 | |
| 1356 | 256 double _gc_overhead_perc; |
| 257 | |
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258 double _reserve_factor; |
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259 size_t _reserve_regions; |
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260 |
| 342 | 261 bool during_marking() { |
| 262 return _during_marking; | |
| 263 } | |
| 264 | |
| 265 private: | |
| 266 enum PredictionConstants { | |
| 267 TruncatedSeqLength = 10 | |
| 268 }; | |
| 269 | |
| 270 TruncatedSeq* _alloc_rate_ms_seq; | |
| 271 double _prev_collection_pause_end_ms; | |
| 272 | |
| 273 TruncatedSeq* _pending_card_diff_seq; | |
| 274 TruncatedSeq* _rs_length_diff_seq; | |
| 275 TruncatedSeq* _cost_per_card_ms_seq; | |
| 4710 | 276 TruncatedSeq* _young_cards_per_entry_ratio_seq; |
| 277 TruncatedSeq* _mixed_cards_per_entry_ratio_seq; | |
| 342 | 278 TruncatedSeq* _cost_per_entry_ms_seq; |
| 4710 | 279 TruncatedSeq* _mixed_cost_per_entry_ms_seq; |
| 342 | 280 TruncatedSeq* _cost_per_byte_ms_seq; |
| 281 TruncatedSeq* _constant_other_time_ms_seq; | |
| 282 TruncatedSeq* _young_other_cost_per_region_ms_seq; | |
| 283 TruncatedSeq* _non_young_other_cost_per_region_ms_seq; | |
| 284 | |
| 285 TruncatedSeq* _pending_cards_seq; | |
| 286 TruncatedSeq* _rs_lengths_seq; | |
| 287 | |
| 288 TruncatedSeq* _cost_per_byte_ms_during_cm_seq; | |
| 289 | |
| 290 TruncatedSeq* _young_gc_eff_seq; | |
| 291 | |
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292 G1YoungGenSizer* _young_gen_sizer; |
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293 |
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294 size_t _eden_cset_region_length; |
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295 size_t _survivor_cset_region_length; |
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296 size_t _old_cset_region_length; |
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297 |
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298 void init_cset_region_lengths(size_t eden_cset_region_length, |
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299 size_t survivor_cset_region_length); |
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300 |
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301 size_t eden_cset_region_length() { return _eden_cset_region_length; } |
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302 size_t survivor_cset_region_length() { return _survivor_cset_region_length; } |
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303 size_t old_cset_region_length() { return _old_cset_region_length; } |
| 342 | 304 |
| 305 size_t _free_regions_at_end_of_collection; | |
| 306 | |
| 307 size_t _recorded_rs_lengths; | |
| 308 size_t _max_rs_lengths; | |
| 309 | |
| 310 double _recorded_young_free_cset_time_ms; | |
| 311 double _recorded_non_young_free_cset_time_ms; | |
| 312 | |
| 313 double _sigma; | |
| 314 double _expensive_region_limit_ms; | |
| 315 | |
| 316 size_t _rs_lengths_prediction; | |
| 317 | |
| 318 size_t _known_garbage_bytes; | |
| 319 double _known_garbage_ratio; | |
| 320 | |
| 321 double sigma() { | |
| 322 return _sigma; | |
| 323 } | |
| 324 | |
| 325 // A function that prevents us putting too much stock in small sample | |
| 326 // sets. Returns a number between 2.0 and 1.0, depending on the number | |
| 327 // of samples. 5 or more samples yields one; fewer scales linearly from | |
| 328 // 2.0 at 1 sample to 1.0 at 5. | |
| 329 double confidence_factor(int samples) { | |
| 330 if (samples > 4) return 1.0; | |
| 331 else return 1.0 + sigma() * ((double)(5 - samples))/2.0; | |
| 332 } | |
| 333 | |
| 334 double get_new_neg_prediction(TruncatedSeq* seq) { | |
| 335 return seq->davg() - sigma() * seq->dsd(); | |
| 336 } | |
| 337 | |
| 338 #ifndef PRODUCT | |
| 339 bool verify_young_ages(HeapRegion* head, SurvRateGroup *surv_rate_group); | |
| 340 #endif // PRODUCT | |
| 341 | |
| 1111 | 342 void adjust_concurrent_refinement(double update_rs_time, |
| 343 double update_rs_processed_buffers, | |
| 344 double goal_ms); | |
| 345 | |
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346 uintx no_of_gc_threads() { return _no_of_gc_threads; } |
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347 void set_no_of_gc_threads(uintx v) { _no_of_gc_threads = v; } |
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348 |
| 342 | 349 double _pause_time_target_ms; |
| 350 double _recorded_young_cset_choice_time_ms; | |
| 351 double _recorded_non_young_cset_choice_time_ms; | |
| 352 size_t _pending_cards; | |
| 353 size_t _max_pending_cards; | |
| 354 | |
| 355 public: | |
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356 // Accessors |
| 342 | 357 |
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358 void set_region_eden(HeapRegion* hr, int young_index_in_cset) { |
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359 hr->set_young(); |
| 342 | 360 hr->install_surv_rate_group(_short_lived_surv_rate_group); |
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361 hr->set_young_index_in_cset(young_index_in_cset); |
| 342 | 362 } |
| 363 | |
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364 void set_region_survivor(HeapRegion* hr, int young_index_in_cset) { |
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365 assert(hr->is_young() && hr->is_survivor(), "pre-condition"); |
| 342 | 366 hr->install_surv_rate_group(_survivor_surv_rate_group); |
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367 hr->set_young_index_in_cset(young_index_in_cset); |
| 342 | 368 } |
| 369 | |
| 370 #ifndef PRODUCT | |
| 371 bool verify_young_ages(); | |
| 372 #endif // PRODUCT | |
| 373 | |
| 374 double get_new_prediction(TruncatedSeq* seq) { | |
| 375 return MAX2(seq->davg() + sigma() * seq->dsd(), | |
| 376 seq->davg() * confidence_factor(seq->num())); | |
| 377 } | |
| 378 | |
| 379 void record_max_rs_lengths(size_t rs_lengths) { | |
| 380 _max_rs_lengths = rs_lengths; | |
| 381 } | |
| 382 | |
| 383 size_t predict_pending_card_diff() { | |
| 384 double prediction = get_new_neg_prediction(_pending_card_diff_seq); | |
| 4710 | 385 if (prediction < 0.00001) { |
| 342 | 386 return 0; |
| 4710 | 387 } else { |
| 342 | 388 return (size_t) prediction; |
| 4710 | 389 } |
| 342 | 390 } |
| 391 | |
| 392 size_t predict_pending_cards() { | |
| 393 size_t max_pending_card_num = _g1->max_pending_card_num(); | |
| 394 size_t diff = predict_pending_card_diff(); | |
| 395 size_t prediction; | |
| 4710 | 396 if (diff > max_pending_card_num) { |
| 342 | 397 prediction = max_pending_card_num; |
| 4710 | 398 } else { |
| 342 | 399 prediction = max_pending_card_num - diff; |
| 4710 | 400 } |
| 342 | 401 |
| 402 return prediction; | |
| 403 } | |
| 404 | |
| 405 size_t predict_rs_length_diff() { | |
| 406 return (size_t) get_new_prediction(_rs_length_diff_seq); | |
| 407 } | |
| 408 | |
| 409 double predict_alloc_rate_ms() { | |
| 410 return get_new_prediction(_alloc_rate_ms_seq); | |
| 411 } | |
| 412 | |
| 413 double predict_cost_per_card_ms() { | |
| 414 return get_new_prediction(_cost_per_card_ms_seq); | |
| 415 } | |
| 416 | |
| 417 double predict_rs_update_time_ms(size_t pending_cards) { | |
| 418 return (double) pending_cards * predict_cost_per_card_ms(); | |
| 419 } | |
| 420 | |
| 4710 | 421 double predict_young_cards_per_entry_ratio() { |
| 422 return get_new_prediction(_young_cards_per_entry_ratio_seq); | |
| 342 | 423 } |
| 424 | |
| 4710 | 425 double predict_mixed_cards_per_entry_ratio() { |
| 426 if (_mixed_cards_per_entry_ratio_seq->num() < 2) { | |
| 427 return predict_young_cards_per_entry_ratio(); | |
| 428 } else { | |
| 429 return get_new_prediction(_mixed_cards_per_entry_ratio_seq); | |
| 430 } | |
| 342 | 431 } |
| 432 | |
| 433 size_t predict_young_card_num(size_t rs_length) { | |
| 434 return (size_t) ((double) rs_length * | |
| 4710 | 435 predict_young_cards_per_entry_ratio()); |
| 342 | 436 } |
| 437 | |
| 438 size_t predict_non_young_card_num(size_t rs_length) { | |
| 439 return (size_t) ((double) rs_length * | |
| 4710 | 440 predict_mixed_cards_per_entry_ratio()); |
| 342 | 441 } |
| 442 | |
| 443 double predict_rs_scan_time_ms(size_t card_num) { | |
| 4710 | 444 if (gcs_are_young()) { |
| 342 | 445 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); |
| 4710 | 446 } else { |
| 447 return predict_mixed_rs_scan_time_ms(card_num); | |
| 448 } | |
| 342 | 449 } |
| 450 | |
| 4710 | 451 double predict_mixed_rs_scan_time_ms(size_t card_num) { |
| 452 if (_mixed_cost_per_entry_ms_seq->num() < 3) { | |
| 342 | 453 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); |
| 4710 | 454 } else { |
| 455 return (double) (card_num * | |
| 456 get_new_prediction(_mixed_cost_per_entry_ms_seq)); | |
| 457 } | |
| 342 | 458 } |
| 459 | |
| 460 double predict_object_copy_time_ms_during_cm(size_t bytes_to_copy) { | |
| 4710 | 461 if (_cost_per_byte_ms_during_cm_seq->num() < 3) { |
| 462 return (1.1 * (double) bytes_to_copy) * | |
| 463 get_new_prediction(_cost_per_byte_ms_seq); | |
| 464 } else { | |
| 342 | 465 return (double) bytes_to_copy * |
| 4710 | 466 get_new_prediction(_cost_per_byte_ms_during_cm_seq); |
| 467 } | |
| 342 | 468 } |
| 469 | |
| 470 double predict_object_copy_time_ms(size_t bytes_to_copy) { | |
| 4710 | 471 if (_in_marking_window && !_in_marking_window_im) { |
| 342 | 472 return predict_object_copy_time_ms_during_cm(bytes_to_copy); |
| 4710 | 473 } else { |
| 342 | 474 return (double) bytes_to_copy * |
| 4710 | 475 get_new_prediction(_cost_per_byte_ms_seq); |
| 476 } | |
| 342 | 477 } |
| 478 | |
| 479 double predict_constant_other_time_ms() { | |
| 480 return get_new_prediction(_constant_other_time_ms_seq); | |
| 481 } | |
| 482 | |
| 483 double predict_young_other_time_ms(size_t young_num) { | |
| 4710 | 484 return (double) young_num * |
| 485 get_new_prediction(_young_other_cost_per_region_ms_seq); | |
| 342 | 486 } |
| 487 | |
| 488 double predict_non_young_other_time_ms(size_t non_young_num) { | |
| 4710 | 489 return (double) non_young_num * |
| 490 get_new_prediction(_non_young_other_cost_per_region_ms_seq); | |
| 342 | 491 } |
| 492 | |
| 493 void check_if_region_is_too_expensive(double predicted_time_ms); | |
| 494 | |
| 495 double predict_young_collection_elapsed_time_ms(size_t adjustment); | |
| 496 double predict_base_elapsed_time_ms(size_t pending_cards); | |
| 497 double predict_base_elapsed_time_ms(size_t pending_cards, | |
| 498 size_t scanned_cards); | |
| 499 size_t predict_bytes_to_copy(HeapRegion* hr); | |
| 500 double predict_region_elapsed_time_ms(HeapRegion* hr, bool young); | |
| 501 | |
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502 void set_recorded_rs_lengths(size_t rs_lengths); |
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503 |
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504 size_t cset_region_length() { return young_cset_region_length() + |
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505 old_cset_region_length(); } |
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506 size_t young_cset_region_length() { return eden_cset_region_length() + |
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507 survivor_cset_region_length(); } |
| 342 | 508 |
| 509 void record_young_free_cset_time_ms(double time_ms) { | |
| 510 _recorded_young_free_cset_time_ms = time_ms; | |
| 511 } | |
| 512 | |
| 513 void record_non_young_free_cset_time_ms(double time_ms) { | |
| 514 _recorded_non_young_free_cset_time_ms = time_ms; | |
| 515 } | |
| 516 | |
| 517 double predict_young_gc_eff() { | |
| 518 return get_new_neg_prediction(_young_gc_eff_seq); | |
| 519 } | |
| 520 | |
| 545 | 521 double predict_survivor_regions_evac_time(); |
| 522 | |
| 342 | 523 void cset_regions_freed() { |
| 4710 | 524 bool propagate = _last_gc_was_young && !_in_marking_window; |
| 342 | 525 _short_lived_surv_rate_group->all_surviving_words_recorded(propagate); |
| 526 _survivor_surv_rate_group->all_surviving_words_recorded(propagate); | |
| 527 // also call it on any more surv rate groups | |
| 528 } | |
| 529 | |
| 530 void set_known_garbage_bytes(size_t known_garbage_bytes) { | |
| 531 _known_garbage_bytes = known_garbage_bytes; | |
| 532 size_t heap_bytes = _g1->capacity(); | |
| 533 _known_garbage_ratio = (double) _known_garbage_bytes / (double) heap_bytes; | |
| 534 } | |
| 535 | |
| 536 void decrease_known_garbage_bytes(size_t known_garbage_bytes) { | |
| 537 guarantee( _known_garbage_bytes >= known_garbage_bytes, "invariant" ); | |
| 538 | |
| 539 _known_garbage_bytes -= known_garbage_bytes; | |
| 540 size_t heap_bytes = _g1->capacity(); | |
| 541 _known_garbage_ratio = (double) _known_garbage_bytes / (double) heap_bytes; | |
| 542 } | |
| 543 | |
| 544 G1MMUTracker* mmu_tracker() { | |
| 545 return _mmu_tracker; | |
| 546 } | |
| 547 | |
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548 double max_pause_time_ms() { |
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549 return _mmu_tracker->max_gc_time() * 1000.0; |
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550 } |
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551 |
| 342 | 552 double predict_remark_time_ms() { |
| 553 return get_new_prediction(_concurrent_mark_remark_times_ms); | |
| 554 } | |
| 555 | |
| 556 double predict_cleanup_time_ms() { | |
| 557 return get_new_prediction(_concurrent_mark_cleanup_times_ms); | |
| 558 } | |
| 559 | |
| 560 // Returns an estimate of the survival rate of the region at yg-age | |
| 561 // "yg_age". | |
| 545 | 562 double predict_yg_surv_rate(int age, SurvRateGroup* surv_rate_group) { |
| 563 TruncatedSeq* seq = surv_rate_group->get_seq(age); | |
| 342 | 564 if (seq->num() == 0) |
| 565 gclog_or_tty->print("BARF! age is %d", age); | |
| 566 guarantee( seq->num() > 0, "invariant" ); | |
| 567 double pred = get_new_prediction(seq); | |
| 568 if (pred > 1.0) | |
| 569 pred = 1.0; | |
| 570 return pred; | |
| 571 } | |
| 572 | |
| 545 | 573 double predict_yg_surv_rate(int age) { |
| 574 return predict_yg_surv_rate(age, _short_lived_surv_rate_group); | |
| 575 } | |
| 576 | |
| 342 | 577 double accum_yg_surv_rate_pred(int age) { |
| 578 return _short_lived_surv_rate_group->accum_surv_rate_pred(age); | |
| 579 } | |
| 580 | |
| 4013 | 581 private: |
| 1611 | 582 void print_stats(int level, const char* str, double value); |
| 583 void print_stats(int level, const char* str, int value); | |
| 584 | |
| 2430 | 585 void print_par_stats(int level, const char* str, double* data); |
| 586 void print_par_sizes(int level, const char* str, double* data); | |
| 342 | 587 |
| 588 void check_other_times(int level, | |
| 589 NumberSeq* other_times_ms, | |
| 590 NumberSeq* calc_other_times_ms) const; | |
| 591 | |
| 592 void print_summary (PauseSummary* stats) const; | |
| 593 | |
| 594 void print_summary (int level, const char* str, NumberSeq* seq) const; | |
| 595 void print_summary_sd (int level, const char* str, NumberSeq* seq) const; | |
| 596 | |
| 597 double avg_value (double* data); | |
| 598 double max_value (double* data); | |
| 599 double sum_of_values (double* data); | |
| 600 double max_sum (double* data1, double* data2); | |
| 601 | |
| 602 double _last_pause_time_ms; | |
| 603 | |
| 604 size_t _bytes_in_collection_set_before_gc; | |
|
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605 size_t _bytes_copied_during_gc; |
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606 |
| 342 | 607 // Used to count used bytes in CS. |
| 608 friend class CountCSClosure; | |
| 609 | |
| 610 // Statistics kept per GC stoppage, pause or full. | |
| 611 TruncatedSeq* _recent_prev_end_times_for_all_gcs_sec; | |
| 612 | |
| 613 // Add a new GC of the given duration and end time to the record. | |
| 614 void update_recent_gc_times(double end_time_sec, double elapsed_ms); | |
| 615 | |
| 616 // The head of the list (via "next_in_collection_set()") representing the | |
|
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617 // current collection set. Set from the incrementally built collection |
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618 // set at the start of the pause. |
| 342 | 619 HeapRegion* _collection_set; |
|
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620 |
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621 // The number of bytes in the collection set before the pause. Set from |
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622 // the incrementally built collection set at the start of an evacuation |
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623 // pause. |
| 342 | 624 size_t _collection_set_bytes_used_before; |
| 625 | |
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626 // The associated information that is maintained while the incremental |
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627 // collection set is being built with young regions. Used to populate |
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628 // the recorded info for the evacuation pause. |
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629 |
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630 enum CSetBuildType { |
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631 Active, // We are actively building the collection set |
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632 Inactive // We are not actively building the collection set |
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633 }; |
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634 |
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635 CSetBuildType _inc_cset_build_state; |
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636 |
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637 // The head of the incrementally built collection set. |
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638 HeapRegion* _inc_cset_head; |
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639 |
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640 // The tail of the incrementally built collection set. |
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641 HeapRegion* _inc_cset_tail; |
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642 |
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643 // The number of bytes in the incrementally built collection set. |
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644 // Used to set _collection_set_bytes_used_before at the start of |
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645 // an evacuation pause. |
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646 size_t _inc_cset_bytes_used_before; |
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647 |
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648 // Used to record the highest end of heap region in collection set |
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649 HeapWord* _inc_cset_max_finger; |
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650 |
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651 // The RSet lengths recorded for regions in the CSet. It is updated |
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652 // by the thread that adds a new region to the CSet. We assume that |
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653 // only one thread can be allocating a new CSet region (currently, |
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654 // it does so after taking the Heap_lock) hence no need to |
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655 // synchronize updates to this field. |
|
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656 size_t _inc_cset_recorded_rs_lengths; |
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657 |
|
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658 // A concurrent refinement thread periodcially samples the young |
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659 // region RSets and needs to update _inc_cset_recorded_rs_lengths as |
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660 // the RSets grow. Instead of having to syncronize updates to that |
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661 // field we accumulate them in this field and add it to |
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662 // _inc_cset_recorded_rs_lengths_diffs at the start of a GC. |
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663 ssize_t _inc_cset_recorded_rs_lengths_diffs; |
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664 |
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665 // The predicted elapsed time it will take to collect the regions in |
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666 // the CSet. This is updated by the thread that adds a new region to |
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667 // the CSet. See the comment for _inc_cset_recorded_rs_lengths about |
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668 // MT-safety assumptions. |
|
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669 double _inc_cset_predicted_elapsed_time_ms; |
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670 |
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671 // See the comment for _inc_cset_recorded_rs_lengths_diffs. |
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672 double _inc_cset_predicted_elapsed_time_ms_diffs; |
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673 |
| 342 | 674 // Stash a pointer to the g1 heap. |
| 675 G1CollectedHeap* _g1; | |
| 676 | |
| 677 // The ratio of gc time to elapsed time, computed over recent pauses. | |
| 678 double _recent_avg_pause_time_ratio; | |
| 679 | |
| 680 double recent_avg_pause_time_ratio() { | |
| 681 return _recent_avg_pause_time_ratio; | |
| 682 } | |
| 683 | |
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684 // At the end of a pause we check the heap occupancy and we decide |
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685 // whether we will start a marking cycle during the next pause. If |
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686 // we decide that we want to do that, we will set this parameter to |
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687 // true. So, this parameter will stay true between the end of a |
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688 // pause and the beginning of a subsequent pause (not necessarily |
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689 // the next one, see the comments on the next field) when we decide |
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690 // that we will indeed start a marking cycle and do the initial-mark |
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691 // work. |
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692 volatile bool _initiate_conc_mark_if_possible; |
| 342 | 693 |
|
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694 // If initiate_conc_mark_if_possible() is set at the beginning of a |
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695 // pause, it is a suggestion that the pause should start a marking |
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696 // cycle by doing the initial-mark work. However, it is possible |
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697 // that the concurrent marking thread is still finishing up the |
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698 // previous marking cycle (e.g., clearing the next marking |
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699 // bitmap). If that is the case we cannot start a new cycle and |
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700 // we'll have to wait for the concurrent marking thread to finish |
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701 // what it is doing. In this case we will postpone the marking cycle |
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702 // initiation decision for the next pause. When we eventually decide |
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703 // to start a cycle, we will set _during_initial_mark_pause which |
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704 // will stay true until the end of the initial-mark pause and it's |
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705 // the condition that indicates that a pause is doing the |
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706 // initial-mark work. |
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707 volatile bool _during_initial_mark_pause; |
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708 |
| 4710 | 709 bool _should_revert_to_young_gcs; |
| 710 bool _last_young_gc; | |
| 342 | 711 |
| 712 // This set of variables tracks the collector efficiency, in order to | |
| 713 // determine whether we should initiate a new marking. | |
| 714 double _cur_mark_stop_world_time_ms; | |
| 715 double _mark_remark_start_sec; | |
| 716 double _mark_cleanup_start_sec; | |
| 717 double _mark_closure_time_ms; | |
| 718 | |
|
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719 // Update the young list target length either by setting it to the |
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720 // desired fixed value or by calculating it using G1's pause |
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721 // prediction model. If no rs_lengths parameter is passed, predict |
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722 // the RS lengths using the prediction model, otherwise use the |
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723 // given rs_lengths as the prediction. |
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724 void update_young_list_target_length(size_t rs_lengths = (size_t) -1); |
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725 |
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726 // Calculate and return the minimum desired young list target |
|
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727 // length. This is the minimum desired young list length according |
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728 // to the user's inputs. |
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729 size_t calculate_young_list_desired_min_length(size_t base_min_length); |
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730 |
|
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731 // Calculate and return the maximum desired young list target |
|
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732 // length. This is the maximum desired young list length according |
|
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733 // to the user's inputs. |
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734 size_t calculate_young_list_desired_max_length(); |
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735 |
|
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|
736 // Calculate and return the maximum young list target length that |
|
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737 // can fit into the pause time goal. The parameters are: rs_lengths |
|
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738 // represent the prediction of how large the young RSet lengths will |
|
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739 // be, base_min_length is the alreay existing number of regions in |
|
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740 // the young list, min_length and max_length are the desired min and |
|
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741 // max young list length according to the user's inputs. |
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742 size_t calculate_young_list_target_length(size_t rs_lengths, |
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743 size_t base_min_length, |
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744 size_t desired_min_length, |
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745 size_t desired_max_length); |
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746 |
|
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747 // Check whether a given young length (young_length) fits into the |
|
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748 // given target pause time and whether the prediction for the amount |
|
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749 // of objects to be copied for the given length will fit into the |
|
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750 // given free space (expressed by base_free_regions). It is used by |
|
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751 // calculate_young_list_target_length(). |
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752 bool predict_will_fit(size_t young_length, double base_time_ms, |
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753 size_t base_free_regions, double target_pause_time_ms); |
| 342 | 754 |
| 4013 | 755 // Count the number of bytes used in the CS. |
| 756 void count_CS_bytes_used(); | |
| 757 | |
| 342 | 758 public: |
| 759 | |
| 760 G1CollectorPolicy(); | |
| 761 | |
| 762 virtual G1CollectorPolicy* as_g1_policy() { return this; } | |
| 763 | |
| 764 virtual CollectorPolicy::Name kind() { | |
| 765 return CollectorPolicy::G1CollectorPolicyKind; | |
| 766 } | |
| 767 | |
|
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768 // Check the current value of the young list RSet lengths and |
|
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769 // compare it against the last prediction. If the current value is |
|
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770 // higher, recalculate the young list target length prediction. |
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771 void revise_young_list_target_length_if_necessary(); |
| 342 | 772 |
| 773 size_t bytes_in_collection_set() { | |
| 774 return _bytes_in_collection_set_before_gc; | |
| 775 } | |
| 776 | |
| 777 unsigned calc_gc_alloc_time_stamp() { | |
| 778 return _all_pause_times_ms->num() + 1; | |
| 779 } | |
| 780 | |
|
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781 // This should be called after the heap is resized. |
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782 void record_new_heap_size(size_t new_number_of_regions); |
|
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783 |
| 4013 | 784 void init(); |
| 342 | 785 |
| 545 | 786 // Create jstat counters for the policy. |
| 787 virtual void initialize_gc_policy_counters(); | |
| 788 | |
| 342 | 789 virtual HeapWord* mem_allocate_work(size_t size, |
| 790 bool is_tlab, | |
| 791 bool* gc_overhead_limit_was_exceeded); | |
| 792 | |
| 793 // This method controls how a collector handles one or more | |
| 794 // of its generations being fully allocated. | |
| 795 virtual HeapWord* satisfy_failed_allocation(size_t size, | |
| 796 bool is_tlab); | |
| 797 | |
| 798 BarrierSet::Name barrier_set_name() { return BarrierSet::G1SATBCTLogging; } | |
| 799 | |
| 800 GenRemSet::Name rem_set_name() { return GenRemSet::CardTable; } | |
| 801 | |
|
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802 bool need_to_start_conc_mark(const char* source, size_t alloc_word_size = 0); |
|
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803 |
| 342 | 804 // Update the heuristic info to record a collection pause of the given |
| 805 // start time, where the given number of bytes were used at the start. | |
| 806 // This may involve changing the desired size of a collection set. | |
| 807 | |
| 4013 | 808 void record_stop_world_start(); |
| 342 | 809 |
| 4013 | 810 void record_collection_pause_start(double start_time_sec, size_t start_used); |
| 342 | 811 |
| 812 // Must currently be called while the world is stopped. | |
|
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813 void record_concurrent_mark_init_end(double |
| 342 | 814 mark_init_elapsed_time_ms); |
| 815 | |
|
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816 void record_mark_closure_time(double mark_closure_time_ms) { |
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817 _mark_closure_time_ms = mark_closure_time_ms; |
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818 } |
| 342 | 819 |
| 4013 | 820 void record_concurrent_mark_remark_start(); |
| 821 void record_concurrent_mark_remark_end(); | |
| 342 | 822 |
| 4013 | 823 void record_concurrent_mark_cleanup_start(); |
|
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824 void record_concurrent_mark_cleanup_end(int no_of_gc_threads); |
| 4013 | 825 void record_concurrent_mark_cleanup_completed(); |
| 342 | 826 |
| 4013 | 827 void record_concurrent_pause(); |
| 828 void record_concurrent_pause_end(); | |
| 342 | 829 |
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830 void record_collection_pause_end(int no_of_gc_threads); |
|
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831 void print_heap_transition(); |
| 342 | 832 |
| 833 // Record the fact that a full collection occurred. | |
| 4013 | 834 void record_full_collection_start(); |
| 835 void record_full_collection_end(); | |
| 342 | 836 |
| 1611 | 837 void record_gc_worker_start_time(int worker_i, double ms) { |
| 838 _par_last_gc_worker_start_times_ms[worker_i] = ms; | |
| 839 } | |
| 840 | |
| 342 | 841 void record_ext_root_scan_time(int worker_i, double ms) { |
| 842 _par_last_ext_root_scan_times_ms[worker_i] = ms; | |
| 843 } | |
| 844 | |
|
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845 void record_satb_filtering_time(int worker_i, double ms) { |
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846 _par_last_satb_filtering_times_ms[worker_i] = ms; |
| 342 | 847 } |
| 848 | |
| 849 void record_satb_drain_time(double ms) { | |
| 4023 | 850 assert(_g1->mark_in_progress(), "shouldn't be here otherwise"); |
| 342 | 851 _cur_satb_drain_time_ms = ms; |
| 852 } | |
| 853 | |
| 854 void record_update_rs_time(int thread, double ms) { | |
| 855 _par_last_update_rs_times_ms[thread] = ms; | |
| 856 } | |
| 857 | |
| 858 void record_update_rs_processed_buffers (int thread, | |
| 859 double processed_buffers) { | |
| 860 _par_last_update_rs_processed_buffers[thread] = processed_buffers; | |
| 861 } | |
| 862 | |
| 863 void record_scan_rs_time(int thread, double ms) { | |
| 864 _par_last_scan_rs_times_ms[thread] = ms; | |
| 865 } | |
| 866 | |
| 867 void reset_obj_copy_time(int thread) { | |
| 868 _par_last_obj_copy_times_ms[thread] = 0.0; | |
| 869 } | |
| 870 | |
| 871 void reset_obj_copy_time() { | |
| 872 reset_obj_copy_time(0); | |
| 873 } | |
| 874 | |
| 875 void record_obj_copy_time(int thread, double ms) { | |
| 876 _par_last_obj_copy_times_ms[thread] += ms; | |
| 877 } | |
| 878 | |
| 1611 | 879 void record_termination(int thread, double ms, size_t attempts) { |
| 880 _par_last_termination_times_ms[thread] = ms; | |
| 881 _par_last_termination_attempts[thread] = (double) attempts; | |
| 342 | 882 } |
| 883 | |
| 1611 | 884 void record_gc_worker_end_time(int worker_i, double ms) { |
| 885 _par_last_gc_worker_end_times_ms[worker_i] = ms; | |
| 342 | 886 } |
| 887 | |
|
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|
888 void record_pause_time_ms(double ms) { |
| 342 | 889 _last_pause_time_ms = ms; |
| 890 } | |
| 891 | |
| 892 void record_clear_ct_time(double ms) { | |
| 893 _cur_clear_ct_time_ms = ms; | |
| 894 } | |
| 895 | |
| 896 void record_par_time(double ms) { | |
| 897 _cur_collection_par_time_ms = ms; | |
| 898 } | |
| 899 | |
| 900 void record_aux_start_time(int i) { | |
| 901 guarantee(i < _aux_num, "should be within range"); | |
| 902 _cur_aux_start_times_ms[i] = os::elapsedTime() * 1000.0; | |
| 903 } | |
| 904 | |
| 905 void record_aux_end_time(int i) { | |
| 906 guarantee(i < _aux_num, "should be within range"); | |
| 907 double ms = os::elapsedTime() * 1000.0 - _cur_aux_start_times_ms[i]; | |
| 908 _cur_aux_times_set[i] = true; | |
| 909 _cur_aux_times_ms[i] += ms; | |
| 910 } | |
| 911 | |
|
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|
912 void record_ref_proc_time(double ms) { |
|
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|
913 _cur_ref_proc_time_ms = ms; |
|
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|
914 } |
|
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|
915 |
|
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|
916 void record_ref_enq_time(double ms) { |
|
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|
917 _cur_ref_enq_time_ms = ms; |
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|
918 } |
|
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|
919 |
|
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|
920 #ifndef PRODUCT |
|
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|
921 void record_cc_clear_time(double ms) { |
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922 if (_min_clear_cc_time_ms < 0.0 || ms <= _min_clear_cc_time_ms) |
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923 _min_clear_cc_time_ms = ms; |
|
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924 if (_max_clear_cc_time_ms < 0.0 || ms >= _max_clear_cc_time_ms) |
|
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925 _max_clear_cc_time_ms = ms; |
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926 _cur_clear_cc_time_ms = ms; |
|
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927 _cum_clear_cc_time_ms += ms; |
|
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|
928 _num_cc_clears++; |
|
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|
929 } |
|
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|
930 #endif |
|
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|
931 |
|
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932 // Record how much space we copied during a GC. This is typically |
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933 // called when a GC alloc region is being retired. |
|
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934 void record_bytes_copied_during_gc(size_t bytes) { |
|
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935 _bytes_copied_during_gc += bytes; |
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|
936 } |
|
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|
937 |
|
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938 // The amount of space we copied during a GC. |
|
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939 size_t bytes_copied_during_gc() { |
|
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|
940 return _bytes_copied_during_gc; |
|
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|
941 } |
| 342 | 942 |
| 943 // Choose a new collection set. Marks the chosen regions as being | |
| 944 // "in_collection_set", and links them together. The head and number of | |
| 945 // the collection set are available via access methods. | |
| 4013 | 946 void choose_collection_set(double target_pause_time_ms); |
| 342 | 947 |
| 948 // The head of the list (via "next_in_collection_set()") representing the | |
| 949 // current collection set. | |
| 950 HeapRegion* collection_set() { return _collection_set; } | |
| 951 | |
|
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952 void clear_collection_set() { _collection_set = NULL; } |
|
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|
953 |
|
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954 // Add old region "hr" to the CSet. |
|
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955 void add_old_region_to_cset(HeapRegion* hr); |
| 342 | 956 |
|
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957 // Incremental CSet Support |
|
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958 |
|
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|
959 // The head of the incrementally built collection set. |
|
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960 HeapRegion* inc_cset_head() { return _inc_cset_head; } |
|
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961 |
|
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|
962 // The tail of the incrementally built collection set. |
|
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|
963 HeapRegion* inc_set_tail() { return _inc_cset_tail; } |
|
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964 |
|
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965 // Initialize incremental collection set info. |
|
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966 void start_incremental_cset_building(); |
|
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967 |
|
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968 // Perform any final calculations on the incremental CSet fields |
|
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969 // before we can use them. |
|
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970 void finalize_incremental_cset_building(); |
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971 |
|
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972 void clear_incremental_cset() { |
|
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973 _inc_cset_head = NULL; |
|
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974 _inc_cset_tail = NULL; |
|
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975 } |
|
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976 |
|
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|
977 // Stop adding regions to the incremental collection set |
|
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978 void stop_incremental_cset_building() { _inc_cset_build_state = Inactive; } |
|
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979 |
|
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980 // Add information about hr to the aggregated information for the |
|
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981 // incrementally built collection set. |
|
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982 void add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length); |
|
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983 |
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984 // Update information about hr in the aggregated information for |
|
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985 // the incrementally built collection set. |
|
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986 void update_incremental_cset_info(HeapRegion* hr, size_t new_rs_length); |
|
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987 |
|
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988 private: |
|
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989 // Update the incremental cset information when adding a region |
|
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990 // (should not be called directly). |
|
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991 void add_region_to_incremental_cset_common(HeapRegion* hr); |
|
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992 |
|
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993 public: |
|
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994 // Add hr to the LHS of the incremental collection set. |
|
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995 void add_region_to_incremental_cset_lhs(HeapRegion* hr); |
|
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996 |
|
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|
997 // Add hr to the RHS of the incremental collection set. |
|
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998 void add_region_to_incremental_cset_rhs(HeapRegion* hr); |
|
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999 |
|
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1000 #ifndef PRODUCT |
|
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1001 void print_collection_set(HeapRegion* list_head, outputStream* st); |
|
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1002 #endif // !PRODUCT |
|
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1003 |
|
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1004 bool initiate_conc_mark_if_possible() { return _initiate_conc_mark_if_possible; } |
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1005 void set_initiate_conc_mark_if_possible() { _initiate_conc_mark_if_possible = true; } |
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1006 void clear_initiate_conc_mark_if_possible() { _initiate_conc_mark_if_possible = false; } |
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1007 |
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1008 bool during_initial_mark_pause() { return _during_initial_mark_pause; } |
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1009 void set_during_initial_mark_pause() { _during_initial_mark_pause = true; } |
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1010 void clear_during_initial_mark_pause(){ _during_initial_mark_pause = false; } |
|
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1011 |
|
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1012 // This sets the initiate_conc_mark_if_possible() flag to start a |
|
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1013 // new cycle, as long as we are not already in one. It's best if it |
|
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1014 // is called during a safepoint when the test whether a cycle is in |
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1015 // progress or not is stable. |
|
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1016 bool force_initial_mark_if_outside_cycle(GCCause::Cause gc_cause); |
|
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1017 |
|
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1018 // This is called at the very beginning of an evacuation pause (it |
|
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1019 // has to be the first thing that the pause does). If |
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1020 // initiate_conc_mark_if_possible() is true, and the concurrent |
|
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1021 // marking thread has completed its work during the previous cycle, |
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1022 // it will set during_initial_mark_pause() to so that the pause does |
|
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1023 // the initial-mark work and start a marking cycle. |
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1024 void decide_on_conc_mark_initiation(); |
| 342 | 1025 |
| 1026 // If an expansion would be appropriate, because recent GC overhead had | |
| 1027 // exceeded the desired limit, return an amount to expand by. | |
| 4013 | 1028 size_t expansion_amount(); |
| 342 | 1029 |
| 1030 #ifndef PRODUCT | |
| 1031 // Check any appropriate marked bytes info, asserting false if | |
| 1032 // something's wrong, else returning "true". | |
| 4013 | 1033 bool assertMarkedBytesDataOK(); |
| 342 | 1034 #endif |
| 1035 | |
| 1036 // Print tracing information. | |
| 1037 void print_tracing_info() const; | |
| 1038 | |
| 1039 // Print stats on young survival ratio | |
| 1040 void print_yg_surv_rate_info() const; | |
| 1041 | |
| 545 | 1042 void finished_recalculating_age_indexes(bool is_survivors) { |
| 1043 if (is_survivors) { | |
| 1044 _survivor_surv_rate_group->finished_recalculating_age_indexes(); | |
| 1045 } else { | |
| 1046 _short_lived_surv_rate_group->finished_recalculating_age_indexes(); | |
| 1047 } | |
| 342 | 1048 // do that for any other surv rate groups |
| 1049 } | |
| 1050 | |
| 1973 | 1051 bool is_young_list_full() { |
| 1052 size_t young_list_length = _g1->young_list()->length(); | |
|
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1053 size_t young_list_target_length = _young_list_target_length; |
|
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1054 return young_list_length >= young_list_target_length; |
|
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1055 } |
|
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|
1056 |
|
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|
1057 bool can_expand_young_list() { |
|
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1058 size_t young_list_length = _g1->young_list()->length(); |
|
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1059 size_t young_list_max_length = _young_list_max_length; |
|
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1060 return young_list_length < young_list_max_length; |
|
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|
1061 } |
| 1973 | 1062 |
|
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1063 size_t young_list_max_length() { |
|
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|
1064 return _young_list_max_length; |
|
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|
1065 } |
|
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|
1066 |
| 4710 | 1067 bool gcs_are_young() { |
| 1068 return _gcs_are_young; | |
| 342 | 1069 } |
| 4710 | 1070 void set_gcs_are_young(bool gcs_are_young) { |
| 1071 _gcs_are_young = gcs_are_young; | |
| 342 | 1072 } |
| 1073 | |
| 1074 bool adaptive_young_list_length() { | |
|
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1075 return _young_gen_sizer->adaptive_young_list_length(); |
| 342 | 1076 } |
| 1077 | |
| 1078 inline double get_gc_eff_factor() { | |
| 1079 double ratio = _known_garbage_ratio; | |
| 1080 | |
| 1081 double square = ratio * ratio; | |
| 1082 // square = square * square; | |
| 1083 double ret = square * 9.0 + 1.0; | |
| 1084 #if 0 | |
| 1085 gclog_or_tty->print_cr("ratio = %1.2lf, ret = %1.2lf", ratio, ret); | |
| 1086 #endif // 0 | |
| 1087 guarantee(0.0 <= ret && ret < 10.0, "invariant!"); | |
| 1088 return ret; | |
| 1089 } | |
| 1090 | |
| 4013 | 1091 private: |
| 342 | 1092 // |
| 1093 // Survivor regions policy. | |
| 1094 // | |
| 1095 | |
| 1096 // Current tenuring threshold, set to 0 if the collector reaches the | |
| 1097 // maximum amount of suvivors regions. | |
| 1098 int _tenuring_threshold; | |
| 1099 | |
| 545 | 1100 // The limit on the number of regions allocated for survivors. |
| 1101 size_t _max_survivor_regions; | |
| 1102 | |
|
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1103 // For reporting purposes. |
|
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1104 size_t _eden_bytes_before_gc; |
|
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1105 size_t _survivor_bytes_before_gc; |
|
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1106 size_t _capacity_before_gc; |
|
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1107 |
| 545 | 1108 // The amount of survor regions after a collection. |
| 1109 size_t _recorded_survivor_regions; | |
| 1110 // List of survivor regions. | |
| 1111 HeapRegion* _recorded_survivor_head; | |
| 1112 HeapRegion* _recorded_survivor_tail; | |
| 1113 | |
| 1114 ageTable _survivors_age_table; | |
| 1115 | |
| 342 | 1116 public: |
| 1117 | |
| 1118 inline GCAllocPurpose | |
| 1119 evacuation_destination(HeapRegion* src_region, int age, size_t word_sz) { | |
| 1120 if (age < _tenuring_threshold && src_region->is_young()) { | |
| 1121 return GCAllocForSurvived; | |
| 1122 } else { | |
| 1123 return GCAllocForTenured; | |
| 1124 } | |
| 1125 } | |
| 1126 | |
| 1127 inline bool track_object_age(GCAllocPurpose purpose) { | |
| 1128 return purpose == GCAllocForSurvived; | |
| 1129 } | |
| 1130 | |
| 545 | 1131 static const size_t REGIONS_UNLIMITED = ~(size_t)0; |
| 1132 | |
| 1133 size_t max_regions(int purpose); | |
| 342 | 1134 |
| 1135 // The limit on regions for a particular purpose is reached. | |
| 1136 void note_alloc_region_limit_reached(int purpose) { | |
| 1137 if (purpose == GCAllocForSurvived) { | |
| 1138 _tenuring_threshold = 0; | |
| 1139 } | |
| 1140 } | |
| 1141 | |
| 1142 void note_start_adding_survivor_regions() { | |
| 1143 _survivor_surv_rate_group->start_adding_regions(); | |
| 1144 } | |
| 1145 | |
| 1146 void note_stop_adding_survivor_regions() { | |
| 1147 _survivor_surv_rate_group->stop_adding_regions(); | |
| 1148 } | |
| 545 | 1149 |
|
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1150 void tenure_all_objects() { |
|
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1151 _max_survivor_regions = 0; |
|
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1152 _tenuring_threshold = 0; |
|
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1153 } |
|
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1154 |
| 545 | 1155 void record_survivor_regions(size_t regions, |
| 1156 HeapRegion* head, | |
| 1157 HeapRegion* tail) { | |
| 1158 _recorded_survivor_regions = regions; | |
| 1159 _recorded_survivor_head = head; | |
| 1160 _recorded_survivor_tail = tail; | |
| 1161 } | |
| 1162 | |
|
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1163 size_t recorded_survivor_regions() { |
|
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1164 return _recorded_survivor_regions; |
|
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1165 } |
|
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1166 |
| 545 | 1167 void record_thread_age_table(ageTable* age_table) |
| 1168 { | |
| 1169 _survivors_age_table.merge_par(age_table); | |
| 1170 } | |
| 1171 | |
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1172 void update_max_gc_locker_expansion(); |
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1173 |
| 545 | 1174 // Calculates survivor space parameters. |
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1175 void update_survivors_policy(); |
| 545 | 1176 |
| 342 | 1177 }; |
| 1178 | |
| 1179 // This should move to some place more general... | |
| 1180 | |
| 1181 // If we have "n" measurements, and we've kept track of their "sum" and the | |
| 1182 // "sum_of_squares" of the measurements, this returns the variance of the | |
| 1183 // sequence. | |
| 1184 inline double variance(int n, double sum_of_squares, double sum) { | |
| 1185 double n_d = (double)n; | |
| 1186 double avg = sum/n_d; | |
| 1187 return (sum_of_squares - 2.0 * avg * sum + n_d * avg * avg) / n_d; | |
| 1188 } | |
| 1189 | |
| 1972 | 1190 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTORPOLICY_HPP |