Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.hpp @ 12233:40136aa2cdb1
8010722: assert: failed: heap size is too big for compressed oops
Summary: Use conservative assumptions of required alignment for the various garbage collector components into account when determining the maximum heap size that supports compressed oops. Using this conservative value avoids several circular dependencies in the calculation.
Reviewed-by: stefank, dholmes
author | tschatzl |
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date | Wed, 11 Sep 2013 16:25:02 +0200 |
parents | f2110083203d |
children | 4288e54fd145 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2013, 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; | |
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39 class G1GCPhaseTimes; |
342 | 40 |
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41 // TraceGen0Time collects data on _both_ young and mixed evacuation pauses |
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42 // (the latter may contain non-young regions - i.e. regions that are |
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43 // technically in Gen1) while TraceGen1Time collects data about full GCs. |
6197 | 44 class TraceGen0TimeData : public CHeapObj<mtGC> { |
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45 private: |
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46 unsigned _young_pause_num; |
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47 unsigned _mixed_pause_num; |
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48 |
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49 NumberSeq _all_stop_world_times_ms; |
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50 NumberSeq _all_yield_times_ms; |
342 | 51 |
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52 NumberSeq _total; |
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53 NumberSeq _other; |
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54 NumberSeq _root_region_scan_wait; |
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55 NumberSeq _parallel; |
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56 NumberSeq _ext_root_scan; |
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57 NumberSeq _satb_filtering; |
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58 NumberSeq _update_rs; |
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59 NumberSeq _scan_rs; |
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60 NumberSeq _obj_copy; |
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61 NumberSeq _termination; |
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62 NumberSeq _parallel_other; |
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63 NumberSeq _clear_ct; |
342 | 64 |
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65 void print_summary(const char* str, const NumberSeq* seq) const; |
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66 void print_summary_sd(const char* str, const NumberSeq* seq) const; |
342 | 67 |
68 public: | |
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69 TraceGen0TimeData() : _young_pause_num(0), _mixed_pause_num(0) {}; |
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70 void record_start_collection(double time_to_stop_the_world_ms); |
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71 void record_yield_time(double yield_time_ms); |
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72 void record_end_collection(double pause_time_ms, G1GCPhaseTimes* phase_times); |
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73 void increment_young_collection_count(); |
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74 void increment_mixed_collection_count(); |
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75 void print() const; |
342 | 76 }; |
77 | |
6197 | 78 class TraceGen1TimeData : public CHeapObj<mtGC> { |
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79 private: |
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80 NumberSeq _all_full_gc_times; |
342 | 81 |
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82 public: |
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83 void record_full_collection(double full_gc_time_ms); |
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84 void print() const; |
342 | 85 }; |
86 | |
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87 // There are three command line options related to the young gen size: |
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88 // NewSize, MaxNewSize and NewRatio (There is also -Xmn, but that is |
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89 // just a short form for NewSize==MaxNewSize). G1 will use its internal |
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90 // heuristics to calculate the actual young gen size, so these options |
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91 // basically only limit the range within which G1 can pick a young gen |
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92 // size. Also, these are general options taking byte sizes. G1 will |
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93 // internally work with a number of regions instead. So, some rounding |
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94 // will occur. |
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95 // |
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96 // If nothing related to the the young gen size is set on the command |
7449 | 97 // line we should allow the young gen to be between G1NewSizePercent |
98 // and G1MaxNewSizePercent of the heap size. This means that every time | |
99 // the heap size changes, the limits for the young gen size will be | |
100 // recalculated. | |
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101 // |
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102 // If only -XX:NewSize is set we should use the specified value as the |
7449 | 103 // minimum size for young gen. Still using G1MaxNewSizePercent of the |
104 // heap as maximum. | |
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105 // |
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106 // If only -XX:MaxNewSize is set we should use the specified value as the |
7449 | 107 // maximum size for young gen. Still using G1NewSizePercent of the heap |
108 // as minimum. | |
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109 // |
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110 // If -XX:NewSize and -XX:MaxNewSize are both specified we use these values. |
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111 // No updates when the heap size changes. There is a special case when |
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112 // NewSize==MaxNewSize. This is interpreted as "fixed" and will use a |
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113 // different heuristic for calculating the collection set when we do mixed |
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114 // collection. |
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115 // |
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116 // If only -XX:NewRatio is set we should use the specified ratio of the heap |
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117 // as both min and max. This will be interpreted as "fixed" just like the |
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118 // NewSize==MaxNewSize case above. But we will update the min and max |
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119 // everytime the heap size changes. |
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120 // |
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121 // NewSize and MaxNewSize override NewRatio. So, NewRatio is ignored if it is |
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122 // combined with either NewSize or MaxNewSize. (A warning message is printed.) |
6197 | 123 class G1YoungGenSizer : public CHeapObj<mtGC> { |
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124 private: |
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125 enum SizerKind { |
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126 SizerDefaults, |
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127 SizerNewSizeOnly, |
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128 SizerMaxNewSizeOnly, |
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129 SizerMaxAndNewSize, |
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130 SizerNewRatio |
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131 }; |
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132 SizerKind _sizer_kind; |
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133 uint _min_desired_young_length; |
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134 uint _max_desired_young_length; |
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135 bool _adaptive_size; |
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136 uint calculate_default_min_length(uint new_number_of_heap_regions); |
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137 uint calculate_default_max_length(uint new_number_of_heap_regions); |
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138 |
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139 public: |
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140 G1YoungGenSizer(); |
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141 void heap_size_changed(uint new_number_of_heap_regions); |
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142 uint min_desired_young_length() { |
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143 return _min_desired_young_length; |
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144 } |
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145 uint max_desired_young_length() { |
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146 return _max_desired_young_length; |
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147 } |
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148 bool adaptive_young_list_length() { |
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149 return _adaptive_size; |
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150 } |
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151 }; |
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152 |
342 | 153 class G1CollectorPolicy: public CollectorPolicy { |
4013 | 154 private: |
342 | 155 // either equal to the number of parallel threads, if ParallelGCThreads |
156 // has been set, or 1 otherwise | |
157 int _parallel_gc_threads; | |
158 | |
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159 // The number of GC threads currently active. |
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160 uintx _no_of_gc_threads; |
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161 |
342 | 162 enum SomePrivateConstants { |
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163 NumPrevPausesForHeuristics = 10 |
342 | 164 }; |
165 | |
166 G1MMUTracker* _mmu_tracker; | |
167 | |
168 void initialize_flags(); | |
169 | |
170 void initialize_all() { | |
171 initialize_flags(); | |
172 initialize_size_info(); | |
173 } | |
174 | |
4013 | 175 CollectionSetChooser* _collectionSetChooser; |
342 | 176 |
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177 double _full_collection_start_sec; |
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178 uint _cur_collection_pause_used_regions_at_start; |
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179 |
342 | 180 // These exclude marking times. |
181 TruncatedSeq* _recent_gc_times_ms; | |
182 | |
183 TruncatedSeq* _concurrent_mark_remark_times_ms; | |
184 TruncatedSeq* _concurrent_mark_cleanup_times_ms; | |
185 | |
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186 TraceGen0TimeData _trace_gen0_time_data; |
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187 TraceGen1TimeData _trace_gen1_time_data; |
342 | 188 |
189 double _stop_world_start; | |
190 | |
4710 | 191 // indicates whether we are in young or mixed GC mode |
192 bool _gcs_are_young; | |
342 | 193 |
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194 uint _young_list_target_length; |
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195 uint _young_list_fixed_length; |
342 | 196 |
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197 // The max number of regions we can extend the eden by while the GC |
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198 // locker is active. This should be >= _young_list_target_length; |
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199 uint _young_list_max_length; |
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200 |
4710 | 201 bool _last_gc_was_young; |
342 | 202 |
203 bool _during_marking; | |
204 bool _in_marking_window; | |
205 bool _in_marking_window_im; | |
206 | |
207 SurvRateGroup* _short_lived_surv_rate_group; | |
208 SurvRateGroup* _survivor_surv_rate_group; | |
209 // add here any more surv rate groups | |
210 | |
1356 | 211 double _gc_overhead_perc; |
212 | |
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213 double _reserve_factor; |
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214 uint _reserve_regions; |
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215 |
342 | 216 bool during_marking() { |
217 return _during_marking; | |
218 } | |
219 | |
220 private: | |
221 enum PredictionConstants { | |
222 TruncatedSeqLength = 10 | |
223 }; | |
224 | |
225 TruncatedSeq* _alloc_rate_ms_seq; | |
226 double _prev_collection_pause_end_ms; | |
227 | |
228 TruncatedSeq* _rs_length_diff_seq; | |
229 TruncatedSeq* _cost_per_card_ms_seq; | |
4710 | 230 TruncatedSeq* _young_cards_per_entry_ratio_seq; |
231 TruncatedSeq* _mixed_cards_per_entry_ratio_seq; | |
342 | 232 TruncatedSeq* _cost_per_entry_ms_seq; |
4710 | 233 TruncatedSeq* _mixed_cost_per_entry_ms_seq; |
342 | 234 TruncatedSeq* _cost_per_byte_ms_seq; |
235 TruncatedSeq* _constant_other_time_ms_seq; | |
236 TruncatedSeq* _young_other_cost_per_region_ms_seq; | |
237 TruncatedSeq* _non_young_other_cost_per_region_ms_seq; | |
238 | |
239 TruncatedSeq* _pending_cards_seq; | |
240 TruncatedSeq* _rs_lengths_seq; | |
241 | |
242 TruncatedSeq* _cost_per_byte_ms_during_cm_seq; | |
243 | |
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244 G1YoungGenSizer* _young_gen_sizer; |
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245 |
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246 uint _eden_cset_region_length; |
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247 uint _survivor_cset_region_length; |
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248 uint _old_cset_region_length; |
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249 |
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250 void init_cset_region_lengths(uint eden_cset_region_length, |
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251 uint survivor_cset_region_length); |
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252 |
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253 uint eden_cset_region_length() { return _eden_cset_region_length; } |
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254 uint survivor_cset_region_length() { return _survivor_cset_region_length; } |
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255 uint old_cset_region_length() { return _old_cset_region_length; } |
342 | 256 |
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257 uint _free_regions_at_end_of_collection; |
342 | 258 |
259 size_t _recorded_rs_lengths; | |
260 size_t _max_rs_lengths; | |
261 double _sigma; | |
262 | |
263 size_t _rs_lengths_prediction; | |
264 | |
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265 double sigma() { return _sigma; } |
342 | 266 |
267 // A function that prevents us putting too much stock in small sample | |
268 // sets. Returns a number between 2.0 and 1.0, depending on the number | |
269 // of samples. 5 or more samples yields one; fewer scales linearly from | |
270 // 2.0 at 1 sample to 1.0 at 5. | |
271 double confidence_factor(int samples) { | |
272 if (samples > 4) return 1.0; | |
273 else return 1.0 + sigma() * ((double)(5 - samples))/2.0; | |
274 } | |
275 | |
276 double get_new_neg_prediction(TruncatedSeq* seq) { | |
277 return seq->davg() - sigma() * seq->dsd(); | |
278 } | |
279 | |
280 #ifndef PRODUCT | |
281 bool verify_young_ages(HeapRegion* head, SurvRateGroup *surv_rate_group); | |
282 #endif // PRODUCT | |
283 | |
1111 | 284 void adjust_concurrent_refinement(double update_rs_time, |
285 double update_rs_processed_buffers, | |
286 double goal_ms); | |
287 | |
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288 uintx no_of_gc_threads() { return _no_of_gc_threads; } |
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289 void set_no_of_gc_threads(uintx v) { _no_of_gc_threads = v; } |
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290 |
342 | 291 double _pause_time_target_ms; |
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292 |
342 | 293 size_t _pending_cards; |
294 | |
295 public: | |
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296 // Accessors |
342 | 297 |
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298 void set_region_eden(HeapRegion* hr, int young_index_in_cset) { |
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299 hr->set_young(); |
342 | 300 hr->install_surv_rate_group(_short_lived_surv_rate_group); |
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301 hr->set_young_index_in_cset(young_index_in_cset); |
342 | 302 } |
303 | |
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304 void set_region_survivor(HeapRegion* hr, int young_index_in_cset) { |
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305 assert(hr->is_young() && hr->is_survivor(), "pre-condition"); |
342 | 306 hr->install_surv_rate_group(_survivor_surv_rate_group); |
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307 hr->set_young_index_in_cset(young_index_in_cset); |
342 | 308 } |
309 | |
310 #ifndef PRODUCT | |
311 bool verify_young_ages(); | |
312 #endif // PRODUCT | |
313 | |
314 double get_new_prediction(TruncatedSeq* seq) { | |
315 return MAX2(seq->davg() + sigma() * seq->dsd(), | |
316 seq->davg() * confidence_factor(seq->num())); | |
317 } | |
318 | |
319 void record_max_rs_lengths(size_t rs_lengths) { | |
320 _max_rs_lengths = rs_lengths; | |
321 } | |
322 | |
323 size_t predict_rs_length_diff() { | |
324 return (size_t) get_new_prediction(_rs_length_diff_seq); | |
325 } | |
326 | |
327 double predict_alloc_rate_ms() { | |
328 return get_new_prediction(_alloc_rate_ms_seq); | |
329 } | |
330 | |
331 double predict_cost_per_card_ms() { | |
332 return get_new_prediction(_cost_per_card_ms_seq); | |
333 } | |
334 | |
335 double predict_rs_update_time_ms(size_t pending_cards) { | |
336 return (double) pending_cards * predict_cost_per_card_ms(); | |
337 } | |
338 | |
4710 | 339 double predict_young_cards_per_entry_ratio() { |
340 return get_new_prediction(_young_cards_per_entry_ratio_seq); | |
342 | 341 } |
342 | |
4710 | 343 double predict_mixed_cards_per_entry_ratio() { |
344 if (_mixed_cards_per_entry_ratio_seq->num() < 2) { | |
345 return predict_young_cards_per_entry_ratio(); | |
346 } else { | |
347 return get_new_prediction(_mixed_cards_per_entry_ratio_seq); | |
348 } | |
342 | 349 } |
350 | |
351 size_t predict_young_card_num(size_t rs_length) { | |
352 return (size_t) ((double) rs_length * | |
4710 | 353 predict_young_cards_per_entry_ratio()); |
342 | 354 } |
355 | |
356 size_t predict_non_young_card_num(size_t rs_length) { | |
357 return (size_t) ((double) rs_length * | |
4710 | 358 predict_mixed_cards_per_entry_ratio()); |
342 | 359 } |
360 | |
361 double predict_rs_scan_time_ms(size_t card_num) { | |
4710 | 362 if (gcs_are_young()) { |
342 | 363 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); |
4710 | 364 } else { |
365 return predict_mixed_rs_scan_time_ms(card_num); | |
366 } | |
342 | 367 } |
368 | |
4710 | 369 double predict_mixed_rs_scan_time_ms(size_t card_num) { |
370 if (_mixed_cost_per_entry_ms_seq->num() < 3) { | |
342 | 371 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); |
4710 | 372 } else { |
373 return (double) (card_num * | |
374 get_new_prediction(_mixed_cost_per_entry_ms_seq)); | |
375 } | |
342 | 376 } |
377 | |
378 double predict_object_copy_time_ms_during_cm(size_t bytes_to_copy) { | |
4710 | 379 if (_cost_per_byte_ms_during_cm_seq->num() < 3) { |
380 return (1.1 * (double) bytes_to_copy) * | |
381 get_new_prediction(_cost_per_byte_ms_seq); | |
382 } else { | |
342 | 383 return (double) bytes_to_copy * |
4710 | 384 get_new_prediction(_cost_per_byte_ms_during_cm_seq); |
385 } | |
342 | 386 } |
387 | |
388 double predict_object_copy_time_ms(size_t bytes_to_copy) { | |
4710 | 389 if (_in_marking_window && !_in_marking_window_im) { |
342 | 390 return predict_object_copy_time_ms_during_cm(bytes_to_copy); |
4710 | 391 } else { |
342 | 392 return (double) bytes_to_copy * |
4710 | 393 get_new_prediction(_cost_per_byte_ms_seq); |
394 } | |
342 | 395 } |
396 | |
397 double predict_constant_other_time_ms() { | |
398 return get_new_prediction(_constant_other_time_ms_seq); | |
399 } | |
400 | |
401 double predict_young_other_time_ms(size_t young_num) { | |
4710 | 402 return (double) young_num * |
403 get_new_prediction(_young_other_cost_per_region_ms_seq); | |
342 | 404 } |
405 | |
406 double predict_non_young_other_time_ms(size_t non_young_num) { | |
4710 | 407 return (double) non_young_num * |
408 get_new_prediction(_non_young_other_cost_per_region_ms_seq); | |
342 | 409 } |
410 | |
411 double predict_base_elapsed_time_ms(size_t pending_cards); | |
412 double predict_base_elapsed_time_ms(size_t pending_cards, | |
413 size_t scanned_cards); | |
414 size_t predict_bytes_to_copy(HeapRegion* hr); | |
6611 | 415 double predict_region_elapsed_time_ms(HeapRegion* hr, bool for_young_gc); |
342 | 416 |
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417 void set_recorded_rs_lengths(size_t rs_lengths); |
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418 |
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419 uint cset_region_length() { return young_cset_region_length() + |
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420 old_cset_region_length(); } |
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421 uint young_cset_region_length() { return eden_cset_region_length() + |
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422 survivor_cset_region_length(); } |
342 | 423 |
545 | 424 double predict_survivor_regions_evac_time(); |
425 | |
342 | 426 void cset_regions_freed() { |
4710 | 427 bool propagate = _last_gc_was_young && !_in_marking_window; |
342 | 428 _short_lived_surv_rate_group->all_surviving_words_recorded(propagate); |
429 _survivor_surv_rate_group->all_surviving_words_recorded(propagate); | |
430 // also call it on any more surv rate groups | |
431 } | |
432 | |
433 G1MMUTracker* mmu_tracker() { | |
434 return _mmu_tracker; | |
435 } | |
436 | |
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437 double max_pause_time_ms() { |
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438 return _mmu_tracker->max_gc_time() * 1000.0; |
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439 } |
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440 |
342 | 441 double predict_remark_time_ms() { |
442 return get_new_prediction(_concurrent_mark_remark_times_ms); | |
443 } | |
444 | |
445 double predict_cleanup_time_ms() { | |
446 return get_new_prediction(_concurrent_mark_cleanup_times_ms); | |
447 } | |
448 | |
449 // Returns an estimate of the survival rate of the region at yg-age | |
450 // "yg_age". | |
545 | 451 double predict_yg_surv_rate(int age, SurvRateGroup* surv_rate_group) { |
452 TruncatedSeq* seq = surv_rate_group->get_seq(age); | |
342 | 453 if (seq->num() == 0) |
454 gclog_or_tty->print("BARF! age is %d", age); | |
455 guarantee( seq->num() > 0, "invariant" ); | |
456 double pred = get_new_prediction(seq); | |
457 if (pred > 1.0) | |
458 pred = 1.0; | |
459 return pred; | |
460 } | |
461 | |
545 | 462 double predict_yg_surv_rate(int age) { |
463 return predict_yg_surv_rate(age, _short_lived_surv_rate_group); | |
464 } | |
465 | |
342 | 466 double accum_yg_surv_rate_pred(int age) { |
467 return _short_lived_surv_rate_group->accum_surv_rate_pred(age); | |
468 } | |
469 | |
4013 | 470 private: |
342 | 471 // Statistics kept per GC stoppage, pause or full. |
472 TruncatedSeq* _recent_prev_end_times_for_all_gcs_sec; | |
473 | |
474 // Add a new GC of the given duration and end time to the record. | |
475 void update_recent_gc_times(double end_time_sec, double elapsed_ms); | |
476 | |
477 // The head of the list (via "next_in_collection_set()") representing the | |
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478 // current collection set. Set from the incrementally built collection |
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479 // set at the start of the pause. |
342 | 480 HeapRegion* _collection_set; |
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481 |
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482 // The number of bytes in the collection set before the pause. Set from |
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483 // the incrementally built collection set at the start of an evacuation |
6611 | 484 // pause, and incremented in finalize_cset() when adding old regions |
485 // (if any) to the collection set. | |
342 | 486 size_t _collection_set_bytes_used_before; |
487 | |
6611 | 488 // The number of bytes copied during the GC. |
489 size_t _bytes_copied_during_gc; | |
490 | |
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491 // The associated information that is maintained while the incremental |
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492 // collection set is being built with young regions. Used to populate |
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493 // the recorded info for the evacuation pause. |
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494 |
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495 enum CSetBuildType { |
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496 Active, // We are actively building the collection set |
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497 Inactive // We are not actively building the collection set |
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498 }; |
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499 |
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500 CSetBuildType _inc_cset_build_state; |
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501 |
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502 // The head of the incrementally built collection set. |
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503 HeapRegion* _inc_cset_head; |
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504 |
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505 // The tail of the incrementally built collection set. |
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506 HeapRegion* _inc_cset_tail; |
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507 |
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508 // The number of bytes in the incrementally built collection set. |
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509 // Used to set _collection_set_bytes_used_before at the start of |
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510 // an evacuation pause. |
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511 size_t _inc_cset_bytes_used_before; |
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512 |
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513 // Used to record the highest end of heap region in collection set |
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514 HeapWord* _inc_cset_max_finger; |
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515 |
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516 // The RSet lengths recorded for regions in the CSet. It is updated |
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517 // by the thread that adds a new region to the CSet. We assume that |
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518 // only one thread can be allocating a new CSet region (currently, |
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519 // it does so after taking the Heap_lock) hence no need to |
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520 // synchronize updates to this field. |
1394
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521 size_t _inc_cset_recorded_rs_lengths; |
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522 |
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523 // A concurrent refinement thread periodcially samples the young |
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524 // region RSets and needs to update _inc_cset_recorded_rs_lengths as |
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525 // the RSets grow. Instead of having to syncronize updates to that |
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526 // field we accumulate them in this field and add it to |
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527 // _inc_cset_recorded_rs_lengths_diffs at the start of a GC. |
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528 ssize_t _inc_cset_recorded_rs_lengths_diffs; |
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529 |
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530 // The predicted elapsed time it will take to collect the regions in |
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531 // the CSet. This is updated by the thread that adds a new region to |
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532 // the CSet. See the comment for _inc_cset_recorded_rs_lengths about |
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533 // MT-safety assumptions. |
1394
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534 double _inc_cset_predicted_elapsed_time_ms; |
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535 |
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536 // See the comment for _inc_cset_recorded_rs_lengths_diffs. |
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537 double _inc_cset_predicted_elapsed_time_ms_diffs; |
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538 |
342 | 539 // Stash a pointer to the g1 heap. |
540 G1CollectedHeap* _g1; | |
541 | |
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542 G1GCPhaseTimes* _phase_times; |
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543 |
342 | 544 // The ratio of gc time to elapsed time, computed over recent pauses. |
545 double _recent_avg_pause_time_ratio; | |
546 | |
547 double recent_avg_pause_time_ratio() { | |
548 return _recent_avg_pause_time_ratio; | |
549 } | |
550 | |
1359
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551 // At the end of a pause we check the heap occupancy and we decide |
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552 // whether we will start a marking cycle during the next pause. If |
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553 // we decide that we want to do that, we will set this parameter to |
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554 // true. So, this parameter will stay true between the end of a |
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555 // pause and the beginning of a subsequent pause (not necessarily |
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556 // the next one, see the comments on the next field) when we decide |
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557 // that we will indeed start a marking cycle and do the initial-mark |
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558 // work. |
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559 volatile bool _initiate_conc_mark_if_possible; |
342 | 560 |
1359
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561 // If initiate_conc_mark_if_possible() is set at the beginning of a |
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562 // pause, it is a suggestion that the pause should start a marking |
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563 // cycle by doing the initial-mark work. However, it is possible |
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564 // that the concurrent marking thread is still finishing up the |
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565 // previous marking cycle (e.g., clearing the next marking |
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566 // bitmap). If that is the case we cannot start a new cycle and |
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567 // we'll have to wait for the concurrent marking thread to finish |
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568 // what it is doing. In this case we will postpone the marking cycle |
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569 // initiation decision for the next pause. When we eventually decide |
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570 // to start a cycle, we will set _during_initial_mark_pause which |
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571 // will stay true until the end of the initial-mark pause and it's |
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572 // the condition that indicates that a pause is doing the |
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573 // initial-mark work. |
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574 volatile bool _during_initial_mark_pause; |
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575 |
4710 | 576 bool _last_young_gc; |
342 | 577 |
578 // This set of variables tracks the collector efficiency, in order to | |
579 // determine whether we should initiate a new marking. | |
580 double _cur_mark_stop_world_time_ms; | |
581 double _mark_remark_start_sec; | |
582 double _mark_cleanup_start_sec; | |
583 | |
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584 // Update the young list target length either by setting it to the |
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585 // desired fixed value or by calculating it using G1's pause |
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586 // prediction model. If no rs_lengths parameter is passed, predict |
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587 // the RS lengths using the prediction model, otherwise use the |
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|
588 // given rs_lengths as the prediction. |
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|
589 void update_young_list_target_length(size_t rs_lengths = (size_t) -1); |
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|
590 |
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|
591 // Calculate and return the minimum desired young list target |
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592 // length. This is the minimum desired young list length according |
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593 // to the user's inputs. |
6010
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594 uint calculate_young_list_desired_min_length(uint base_min_length); |
3919
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|
595 |
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|
596 // Calculate and return the maximum desired young list target |
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|
597 // length. This is the maximum desired young list length according |
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|
598 // to the user's inputs. |
6010
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|
599 uint calculate_young_list_desired_max_length(); |
3919
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|
600 |
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|
601 // Calculate and return the maximum young list target length that |
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|
602 // can fit into the pause time goal. The parameters are: rs_lengths |
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|
603 // represent the prediction of how large the young RSet lengths will |
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|
604 // be, base_min_length is the alreay existing number of regions in |
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|
605 // the young list, min_length and max_length are the desired min and |
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|
606 // max young list length according to the user's inputs. |
6010
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|
607 uint calculate_young_list_target_length(size_t rs_lengths, |
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|
608 uint base_min_length, |
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|
609 uint desired_min_length, |
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|
610 uint desired_max_length); |
3919
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|
611 |
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|
612 // Check whether a given young length (young_length) fits into the |
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|
613 // given target pause time and whether the prediction for the amount |
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|
614 // of objects to be copied for the given length will fit into the |
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615 // given free space (expressed by base_free_regions). It is used by |
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616 // calculate_young_list_target_length(). |
6010
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617 bool predict_will_fit(uint young_length, double base_time_ms, |
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618 uint base_free_regions, double target_pause_time_ms); |
342 | 619 |
8681
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620 // Calculate the minimum number of old regions we'll add to the CSet |
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|
621 // during a mixed GC. |
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|
622 uint calc_min_old_cset_length(); |
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|
623 |
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|
624 // Calculate the maximum number of old regions we'll add to the CSet |
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|
625 // during a mixed GC. |
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|
626 uint calc_max_old_cset_length(); |
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|
627 |
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628 // Returns the given amount of uncollected reclaimable space |
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629 // as a percentage of the current heap capacity. |
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630 double reclaimable_bytes_perc(size_t reclaimable_bytes); |
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631 |
342 | 632 public: |
633 | |
634 G1CollectorPolicy(); | |
635 | |
636 virtual G1CollectorPolicy* as_g1_policy() { return this; } | |
637 | |
638 virtual CollectorPolicy::Name kind() { | |
639 return CollectorPolicy::G1CollectorPolicyKind; | |
640 } | |
641 | |
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642 G1GCPhaseTimes* phase_times() const { return _phase_times; } |
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643 |
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644 // Check the current value of the young list RSet lengths and |
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645 // compare it against the last prediction. If the current value is |
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646 // higher, recalculate the young list target length prediction. |
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647 void revise_young_list_target_length_if_necessary(); |
342 | 648 |
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649 // This should be called after the heap is resized. |
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650 void record_new_heap_size(uint new_number_of_regions); |
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651 |
4013 | 652 void init(); |
342 | 653 |
545 | 654 // Create jstat counters for the policy. |
655 virtual void initialize_gc_policy_counters(); | |
656 | |
342 | 657 virtual HeapWord* mem_allocate_work(size_t size, |
658 bool is_tlab, | |
659 bool* gc_overhead_limit_was_exceeded); | |
660 | |
661 // This method controls how a collector handles one or more | |
662 // of its generations being fully allocated. | |
663 virtual HeapWord* satisfy_failed_allocation(size_t size, | |
664 bool is_tlab); | |
665 | |
666 BarrierSet::Name barrier_set_name() { return BarrierSet::G1SATBCTLogging; } | |
667 | |
668 GenRemSet::Name rem_set_name() { return GenRemSet::CardTable; } | |
669 | |
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670 bool need_to_start_conc_mark(const char* source, size_t alloc_word_size = 0); |
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671 |
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672 // Record the start and end of an evacuation pause. |
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673 void record_collection_pause_start(double start_time_sec); |
10405 | 674 void record_collection_pause_end(double pause_time_ms, EvacuationInfo& evacuation_info); |
342 | 675 |
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676 // Record the start and end of a full collection. |
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677 void record_full_collection_start(); |
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678 void record_full_collection_end(); |
342 | 679 |
680 // Must currently be called while the world is stopped. | |
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681 void record_concurrent_mark_init_end(double mark_init_elapsed_time_ms); |
342 | 682 |
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683 // Record start and end of remark. |
4013 | 684 void record_concurrent_mark_remark_start(); |
685 void record_concurrent_mark_remark_end(); | |
342 | 686 |
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687 // Record start, end, and completion of cleanup. |
4013 | 688 void record_concurrent_mark_cleanup_start(); |
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689 void record_concurrent_mark_cleanup_end(int no_of_gc_threads); |
4013 | 690 void record_concurrent_mark_cleanup_completed(); |
342 | 691 |
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692 // Records the information about the heap size for reporting in |
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693 // print_detailed_heap_transition |
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694 void record_heap_size_info_at_start(bool full); |
342 | 695 |
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696 // Print heap sizing transition (with less and more detail). |
3764
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697 void print_heap_transition(); |
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698 void print_detailed_heap_transition(bool full = false); |
342 | 699 |
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700 void record_stop_world_start(); |
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701 void record_concurrent_pause(); |
342 | 702 |
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703 // Record how much space we copied during a GC. This is typically |
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704 // called when a GC alloc region is being retired. |
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705 void record_bytes_copied_during_gc(size_t bytes) { |
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706 _bytes_copied_during_gc += bytes; |
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707 } |
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708 |
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709 // The amount of space we copied during a GC. |
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710 size_t bytes_copied_during_gc() { |
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711 return _bytes_copied_during_gc; |
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712 } |
342 | 713 |
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714 // Determine whether there are candidate regions so that the |
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715 // next GC should be mixed. The two action strings are used |
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716 // in the ergo output when the method returns true or false. |
4912
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717 bool next_gc_should_be_mixed(const char* true_action_str, |
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718 const char* false_action_str); |
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|
719 |
342 | 720 // Choose a new collection set. Marks the chosen regions as being |
721 // "in_collection_set", and links them together. The head and number of | |
722 // the collection set are available via access methods. | |
10405 | 723 void finalize_cset(double target_pause_time_ms, EvacuationInfo& evacuation_info); |
342 | 724 |
725 // The head of the list (via "next_in_collection_set()") representing the | |
726 // current collection set. | |
727 HeapRegion* collection_set() { return _collection_set; } | |
728 | |
1394
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729 void clear_collection_set() { _collection_set = NULL; } |
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|
730 |
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|
731 // Add old region "hr" to the CSet. |
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732 void add_old_region_to_cset(HeapRegion* hr); |
342 | 733 |
1394
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734 // Incremental CSet Support |
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|
735 |
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736 // The head of the incrementally built collection set. |
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737 HeapRegion* inc_cset_head() { return _inc_cset_head; } |
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738 |
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739 // The tail of the incrementally built collection set. |
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740 HeapRegion* inc_set_tail() { return _inc_cset_tail; } |
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|
741 |
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742 // Initialize incremental collection set info. |
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743 void start_incremental_cset_building(); |
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|
744 |
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|
745 // Perform any final calculations on the incremental CSet fields |
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746 // before we can use them. |
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|
747 void finalize_incremental_cset_building(); |
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|
748 |
1394
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|
749 void clear_incremental_cset() { |
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750 _inc_cset_head = NULL; |
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751 _inc_cset_tail = NULL; |
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|
752 } |
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|
753 |
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|
754 // Stop adding regions to the incremental collection set |
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|
755 void stop_incremental_cset_building() { _inc_cset_build_state = Inactive; } |
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|
756 |
4727
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|
757 // Add information about hr to the aggregated information for the |
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|
758 // incrementally built collection set. |
1394
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|
759 void add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length); |
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|
760 |
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|
761 // Update information about hr in the aggregated information for |
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762 // the incrementally built collection set. |
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|
763 void update_incremental_cset_info(HeapRegion* hr, size_t new_rs_length); |
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|
764 |
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|
765 private: |
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|
766 // Update the incremental cset information when adding a region |
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|
767 // (should not be called directly). |
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768 void add_region_to_incremental_cset_common(HeapRegion* hr); |
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|
769 |
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|
770 public: |
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771 // Add hr to the LHS of the incremental collection set. |
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772 void add_region_to_incremental_cset_lhs(HeapRegion* hr); |
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773 |
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774 // Add hr to the RHS of the incremental collection set. |
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775 void add_region_to_incremental_cset_rhs(HeapRegion* hr); |
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|
776 |
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|
777 #ifndef PRODUCT |
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778 void print_collection_set(HeapRegion* list_head, outputStream* st); |
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779 #endif // !PRODUCT |
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|
780 |
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781 bool initiate_conc_mark_if_possible() { return _initiate_conc_mark_if_possible; } |
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782 void set_initiate_conc_mark_if_possible() { _initiate_conc_mark_if_possible = true; } |
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783 void clear_initiate_conc_mark_if_possible() { _initiate_conc_mark_if_possible = false; } |
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784 |
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|
785 bool during_initial_mark_pause() { return _during_initial_mark_pause; } |
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|
786 void set_during_initial_mark_pause() { _during_initial_mark_pause = true; } |
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787 void clear_during_initial_mark_pause(){ _during_initial_mark_pause = false; } |
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788 |
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789 // This sets the initiate_conc_mark_if_possible() flag to start a |
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790 // new cycle, as long as we are not already in one. It's best if it |
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791 // is called during a safepoint when the test whether a cycle is in |
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792 // progress or not is stable. |
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793 bool force_initial_mark_if_outside_cycle(GCCause::Cause gc_cause); |
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794 |
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795 // This is called at the very beginning of an evacuation pause (it |
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796 // has to be the first thing that the pause does). If |
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797 // initiate_conc_mark_if_possible() is true, and the concurrent |
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798 // marking thread has completed its work during the previous cycle, |
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799 // it will set during_initial_mark_pause() to so that the pause does |
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800 // the initial-mark work and start a marking cycle. |
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801 void decide_on_conc_mark_initiation(); |
342 | 802 |
803 // If an expansion would be appropriate, because recent GC overhead had | |
804 // exceeded the desired limit, return an amount to expand by. | |
4013 | 805 size_t expansion_amount(); |
342 | 806 |
807 // Print tracing information. | |
808 void print_tracing_info() const; | |
809 | |
810 // Print stats on young survival ratio | |
811 void print_yg_surv_rate_info() const; | |
812 | |
545 | 813 void finished_recalculating_age_indexes(bool is_survivors) { |
814 if (is_survivors) { | |
815 _survivor_surv_rate_group->finished_recalculating_age_indexes(); | |
816 } else { | |
817 _short_lived_surv_rate_group->finished_recalculating_age_indexes(); | |
818 } | |
342 | 819 // do that for any other surv rate groups |
820 } | |
821 | |
1973 | 822 bool is_young_list_full() { |
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823 uint young_list_length = _g1->young_list()->length(); |
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824 uint young_list_target_length = _young_list_target_length; |
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825 return young_list_length >= young_list_target_length; |
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826 } |
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827 |
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828 bool can_expand_young_list() { |
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829 uint young_list_length = _g1->young_list()->length(); |
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830 uint young_list_max_length = _young_list_max_length; |
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831 return young_list_length < young_list_max_length; |
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832 } |
1973 | 833 |
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834 uint young_list_max_length() { |
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835 return _young_list_max_length; |
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836 } |
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837 |
4710 | 838 bool gcs_are_young() { |
839 return _gcs_are_young; | |
342 | 840 } |
4710 | 841 void set_gcs_are_young(bool gcs_are_young) { |
842 _gcs_are_young = gcs_are_young; | |
342 | 843 } |
844 | |
845 bool adaptive_young_list_length() { | |
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846 return _young_gen_sizer->adaptive_young_list_length(); |
342 | 847 } |
848 | |
4013 | 849 private: |
342 | 850 // |
851 // Survivor regions policy. | |
852 // | |
853 | |
854 // Current tenuring threshold, set to 0 if the collector reaches the | |
6818 | 855 // maximum amount of survivors regions. |
856 uint _tenuring_threshold; | |
342 | 857 |
545 | 858 // The limit on the number of regions allocated for survivors. |
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859 uint _max_survivor_regions; |
545 | 860 |
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861 // For reporting purposes. |
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862 // The value of _heap_bytes_before_gc is also used to calculate |
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863 // the cost of copying. |
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864 |
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865 size_t _eden_used_bytes_before_gc; // Eden occupancy before GC |
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866 size_t _survivor_used_bytes_before_gc; // Survivor occupancy before GC |
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867 size_t _heap_used_bytes_before_gc; // Heap occupancy before GC |
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868 size_t _metaspace_used_bytes_before_gc; // Metaspace occupancy before GC |
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869 |
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870 size_t _eden_capacity_bytes_before_gc; // Eden capacity before GC |
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871 size_t _heap_capacity_bytes_before_gc; // Heap capacity before GC |
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872 |
6818 | 873 // The amount of survivor regions after a collection. |
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874 uint _recorded_survivor_regions; |
545 | 875 // List of survivor regions. |
876 HeapRegion* _recorded_survivor_head; | |
877 HeapRegion* _recorded_survivor_tail; | |
878 | |
879 ageTable _survivors_age_table; | |
880 | |
342 | 881 public: |
10405 | 882 uint tenuring_threshold() const { return _tenuring_threshold; } |
342 | 883 |
884 inline GCAllocPurpose | |
6818 | 885 evacuation_destination(HeapRegion* src_region, uint age, size_t word_sz) { |
342 | 886 if (age < _tenuring_threshold && src_region->is_young()) { |
887 return GCAllocForSurvived; | |
888 } else { | |
889 return GCAllocForTenured; | |
890 } | |
891 } | |
892 | |
893 inline bool track_object_age(GCAllocPurpose purpose) { | |
894 return purpose == GCAllocForSurvived; | |
895 } | |
896 | |
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897 static const uint REGIONS_UNLIMITED = (uint) -1; |
545 | 898 |
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899 uint max_regions(int purpose); |
342 | 900 |
901 // The limit on regions for a particular purpose is reached. | |
902 void note_alloc_region_limit_reached(int purpose) { | |
903 if (purpose == GCAllocForSurvived) { | |
904 _tenuring_threshold = 0; | |
905 } | |
906 } | |
907 | |
908 void note_start_adding_survivor_regions() { | |
909 _survivor_surv_rate_group->start_adding_regions(); | |
910 } | |
911 | |
912 void note_stop_adding_survivor_regions() { | |
913 _survivor_surv_rate_group->stop_adding_regions(); | |
914 } | |
545 | 915 |
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916 void record_survivor_regions(uint regions, |
545 | 917 HeapRegion* head, |
918 HeapRegion* tail) { | |
919 _recorded_survivor_regions = regions; | |
920 _recorded_survivor_head = head; | |
921 _recorded_survivor_tail = tail; | |
922 } | |
923 | |
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924 uint recorded_survivor_regions() { |
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925 return _recorded_survivor_regions; |
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926 } |
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927 |
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928 void record_thread_age_table(ageTable* age_table) { |
545 | 929 _survivors_age_table.merge_par(age_table); |
930 } | |
931 | |
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932 void update_max_gc_locker_expansion(); |
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933 |
545 | 934 // Calculates survivor space parameters. |
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935 void update_survivors_policy(); |
545 | 936 |
342 | 937 }; |
938 | |
939 // This should move to some place more general... | |
940 | |
941 // If we have "n" measurements, and we've kept track of their "sum" and the | |
942 // "sum_of_squares" of the measurements, this returns the variance of the | |
943 // sequence. | |
944 inline double variance(int n, double sum_of_squares, double sum) { | |
945 double n_d = (double)n; | |
946 double avg = sum/n_d; | |
947 return (sum_of_squares - 2.0 * avg * sum + n_d * avg * avg) / n_d; | |
948 } | |
949 | |
1972 | 950 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTORPOLICY_HPP |