Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.hpp @ 6059:3a22b77e755a
7161545: G1: Minor cleanups to the G1 logging
Summary: Rename "to-space-overflow" to "to-space-exhausted", Introduce one decimal point in the size format, Add Sum to the aggregate and re-order the entries, Add number of GC workers to the log output
Reviewed-by: johnc, jwilhelm
author | brutisso |
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date | Mon, 14 May 2012 17:32:17 +0200 |
parents | f7a8920427a6 |
children | bbc900c2482a |
rev | line source |
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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 | |
549
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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 { |
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67 define_num_seq(root_region_scan_wait) |
342 | 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 | |
4023 | 76 define_num_seq(clear_ct) |
342 | 77 }; |
78 | |
677 | 79 class Summary: public PauseSummary, |
80 public MainBodySummary { | |
342 | 81 public: |
82 virtual MainBodySummary* main_body_summary() { return this; } | |
83 }; | |
84 | |
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85 // There are three command line options related to the young gen size: |
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86 // NewSize, MaxNewSize and NewRatio (There is also -Xmn, but that is |
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87 // just a short form for NewSize==MaxNewSize). G1 will use its internal |
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88 // heuristics to calculate the actual young gen size, so these options |
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89 // basically only limit the range within which G1 can pick a young gen |
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90 // size. Also, these are general options taking byte sizes. G1 will |
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91 // internally work with a number of regions instead. So, some rounding |
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92 // will occur. |
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93 // |
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94 // If nothing related to the the young gen size is set on the command |
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95 // line we should allow the young gen to be between |
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96 // G1DefaultMinNewGenPercent and G1DefaultMaxNewGenPercent of the |
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97 // heap size. This means that every time the heap size changes the |
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98 // limits for the young gen size will be updated. |
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99 // |
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100 // If only -XX:NewSize is set we should use the specified value as the |
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101 // minimum size for young gen. Still using G1DefaultMaxNewGenPercent |
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102 // of the heap as maximum. |
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103 // |
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104 // If only -XX:MaxNewSize is set we should use the specified value as the |
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105 // maximum size for young gen. Still using G1DefaultMinNewGenPercent |
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106 // of the heap as minimum. |
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107 // |
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108 // If -XX:NewSize and -XX:MaxNewSize are both specified we use these values. |
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109 // No updates when the heap size changes. There is a special case when |
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110 // NewSize==MaxNewSize. This is interpreted as "fixed" and will use a |
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111 // different heuristic for calculating the collection set when we do mixed |
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112 // collection. |
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113 // |
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114 // If only -XX:NewRatio is set we should use the specified ratio of the heap |
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115 // as both min and max. This will be interpreted as "fixed" just like the |
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116 // NewSize==MaxNewSize case above. But we will update the min and max |
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117 // everytime the heap size changes. |
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118 // |
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119 // NewSize and MaxNewSize override NewRatio. So, NewRatio is ignored if it is |
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120 // combined with either NewSize or MaxNewSize. (A warning message is printed.) |
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121 class G1YoungGenSizer : public CHeapObj { |
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122 private: |
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123 enum SizerKind { |
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124 SizerDefaults, |
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125 SizerNewSizeOnly, |
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126 SizerMaxNewSizeOnly, |
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127 SizerMaxAndNewSize, |
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128 SizerNewRatio |
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129 }; |
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130 SizerKind _sizer_kind; |
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131 uint _min_desired_young_length; |
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132 uint _max_desired_young_length; |
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133 bool _adaptive_size; |
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134 uint calculate_default_min_length(uint new_number_of_heap_regions); |
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135 uint calculate_default_max_length(uint new_number_of_heap_regions); |
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136 |
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137 public: |
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138 G1YoungGenSizer(); |
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139 void heap_size_changed(uint new_number_of_heap_regions); |
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140 uint min_desired_young_length() { |
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141 return _min_desired_young_length; |
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142 } |
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143 uint max_desired_young_length() { |
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144 return _max_desired_young_length; |
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145 } |
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146 bool adaptive_young_list_length() { |
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147 return _adaptive_size; |
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148 } |
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149 }; |
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150 |
342 | 151 class G1CollectorPolicy: public CollectorPolicy { |
4013 | 152 private: |
342 | 153 // either equal to the number of parallel threads, if ParallelGCThreads |
154 // has been set, or 1 otherwise | |
155 int _parallel_gc_threads; | |
156 | |
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157 // The number of GC threads currently active. |
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158 uintx _no_of_gc_threads; |
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159 |
342 | 160 enum SomePrivateConstants { |
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161 NumPrevPausesForHeuristics = 10 |
342 | 162 }; |
163 | |
164 G1MMUTracker* _mmu_tracker; | |
165 | |
166 void initialize_flags(); | |
167 | |
168 void initialize_all() { | |
169 initialize_flags(); | |
170 initialize_size_info(); | |
171 initialize_perm_generation(PermGen::MarkSweepCompact); | |
172 } | |
173 | |
4013 | 174 CollectionSetChooser* _collectionSetChooser; |
342 | 175 |
176 double _cur_collection_start_sec; | |
177 size_t _cur_collection_pause_used_at_start_bytes; | |
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178 uint _cur_collection_pause_used_regions_at_start; |
342 | 179 double _cur_collection_par_time_ms; |
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180 |
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181 double _cur_collection_code_root_fixup_time_ms; |
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182 |
342 | 183 double _cur_clear_ct_time_ms; |
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184 double _cur_ref_proc_time_ms; |
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185 double _cur_ref_enq_time_ms; |
342 | 186 |
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187 #ifndef PRODUCT |
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188 // Card Table Count Cache stats |
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189 double _min_clear_cc_time_ms; // min |
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190 double _max_clear_cc_time_ms; // max |
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191 double _cur_clear_cc_time_ms; // clearing time during current pause |
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192 double _cum_clear_cc_time_ms; // cummulative clearing time |
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193 jlong _num_cc_clears; // number of times the card count cache has been cleared |
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194 #endif |
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195 |
342 | 196 // These exclude marking times. |
197 TruncatedSeq* _recent_gc_times_ms; | |
198 | |
199 TruncatedSeq* _concurrent_mark_remark_times_ms; | |
200 TruncatedSeq* _concurrent_mark_cleanup_times_ms; | |
201 | |
677 | 202 Summary* _summary; |
342 | 203 |
204 NumberSeq* _all_pause_times_ms; | |
205 NumberSeq* _all_full_gc_times_ms; | |
206 double _stop_world_start; | |
207 NumberSeq* _all_stop_world_times_ms; | |
208 NumberSeq* _all_yield_times_ms; | |
209 | |
210 int _aux_num; | |
211 NumberSeq* _all_aux_times_ms; | |
212 double* _cur_aux_start_times_ms; | |
213 double* _cur_aux_times_ms; | |
214 bool* _cur_aux_times_set; | |
215 | |
1611 | 216 double* _par_last_gc_worker_start_times_ms; |
342 | 217 double* _par_last_ext_root_scan_times_ms; |
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218 double* _par_last_satb_filtering_times_ms; |
342 | 219 double* _par_last_update_rs_times_ms; |
220 double* _par_last_update_rs_processed_buffers; | |
221 double* _par_last_scan_rs_times_ms; | |
222 double* _par_last_obj_copy_times_ms; | |
223 double* _par_last_termination_times_ms; | |
1611 | 224 double* _par_last_termination_attempts; |
225 double* _par_last_gc_worker_end_times_ms; | |
2430 | 226 double* _par_last_gc_worker_times_ms; |
342 | 227 |
4023 | 228 // Each workers 'other' time i.e. the elapsed time of the parallel |
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229 // code executed by a worker minus the sum of the individual sub-phase |
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230 // times for that worker thread. |
4023 | 231 double* _par_last_gc_worker_other_times_ms; |
232 | |
4710 | 233 // indicates whether we are in young or mixed GC mode |
234 bool _gcs_are_young; | |
342 | 235 |
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236 uint _young_list_target_length; |
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237 uint _young_list_fixed_length; |
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238 size_t _prev_eden_capacity; // used for logging |
342 | 239 |
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240 // The max number of regions we can extend the eden by while the GC |
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241 // locker is active. This should be >= _young_list_target_length; |
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242 uint _young_list_max_length; |
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243 |
4710 | 244 bool _last_gc_was_young; |
342 | 245 |
4710 | 246 unsigned _young_pause_num; |
247 unsigned _mixed_pause_num; | |
342 | 248 |
249 bool _during_marking; | |
250 bool _in_marking_window; | |
251 bool _in_marking_window_im; | |
252 | |
253 SurvRateGroup* _short_lived_surv_rate_group; | |
254 SurvRateGroup* _survivor_surv_rate_group; | |
255 // add here any more surv rate groups | |
256 | |
1356 | 257 double _gc_overhead_perc; |
258 | |
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259 double _reserve_factor; |
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260 uint _reserve_regions; |
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261 |
342 | 262 bool during_marking() { |
263 return _during_marking; | |
264 } | |
265 | |
266 private: | |
267 enum PredictionConstants { | |
268 TruncatedSeqLength = 10 | |
269 }; | |
270 | |
271 TruncatedSeq* _alloc_rate_ms_seq; | |
272 double _prev_collection_pause_end_ms; | |
273 | |
274 TruncatedSeq* _pending_card_diff_seq; | |
275 TruncatedSeq* _rs_length_diff_seq; | |
276 TruncatedSeq* _cost_per_card_ms_seq; | |
4710 | 277 TruncatedSeq* _young_cards_per_entry_ratio_seq; |
278 TruncatedSeq* _mixed_cards_per_entry_ratio_seq; | |
342 | 279 TruncatedSeq* _cost_per_entry_ms_seq; |
4710 | 280 TruncatedSeq* _mixed_cost_per_entry_ms_seq; |
342 | 281 TruncatedSeq* _cost_per_byte_ms_seq; |
282 TruncatedSeq* _constant_other_time_ms_seq; | |
283 TruncatedSeq* _young_other_cost_per_region_ms_seq; | |
284 TruncatedSeq* _non_young_other_cost_per_region_ms_seq; | |
285 | |
286 TruncatedSeq* _pending_cards_seq; | |
287 TruncatedSeq* _rs_lengths_seq; | |
288 | |
289 TruncatedSeq* _cost_per_byte_ms_during_cm_seq; | |
290 | |
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291 G1YoungGenSizer* _young_gen_sizer; |
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292 |
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293 uint _eden_cset_region_length; |
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294 uint _survivor_cset_region_length; |
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295 uint _old_cset_region_length; |
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296 |
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297 void init_cset_region_lengths(uint eden_cset_region_length, |
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298 uint survivor_cset_region_length); |
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299 |
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300 uint eden_cset_region_length() { return _eden_cset_region_length; } |
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301 uint survivor_cset_region_length() { return _survivor_cset_region_length; } |
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302 uint old_cset_region_length() { return _old_cset_region_length; } |
342 | 303 |
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304 uint _free_regions_at_end_of_collection; |
342 | 305 |
306 size_t _recorded_rs_lengths; | |
307 size_t _max_rs_lengths; | |
308 | |
309 double _recorded_young_free_cset_time_ms; | |
310 double _recorded_non_young_free_cset_time_ms; | |
311 | |
312 double _sigma; | |
313 | |
314 size_t _rs_lengths_prediction; | |
315 | |
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316 double sigma() { return _sigma; } |
342 | 317 |
318 // A function that prevents us putting too much stock in small sample | |
319 // sets. Returns a number between 2.0 and 1.0, depending on the number | |
320 // of samples. 5 or more samples yields one; fewer scales linearly from | |
321 // 2.0 at 1 sample to 1.0 at 5. | |
322 double confidence_factor(int samples) { | |
323 if (samples > 4) return 1.0; | |
324 else return 1.0 + sigma() * ((double)(5 - samples))/2.0; | |
325 } | |
326 | |
327 double get_new_neg_prediction(TruncatedSeq* seq) { | |
328 return seq->davg() - sigma() * seq->dsd(); | |
329 } | |
330 | |
331 #ifndef PRODUCT | |
332 bool verify_young_ages(HeapRegion* head, SurvRateGroup *surv_rate_group); | |
333 #endif // PRODUCT | |
334 | |
1111 | 335 void adjust_concurrent_refinement(double update_rs_time, |
336 double update_rs_processed_buffers, | |
337 double goal_ms); | |
338 | |
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339 uintx no_of_gc_threads() { return _no_of_gc_threads; } |
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340 void set_no_of_gc_threads(uintx v) { _no_of_gc_threads = v; } |
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341 |
342 | 342 double _pause_time_target_ms; |
343 double _recorded_young_cset_choice_time_ms; | |
344 double _recorded_non_young_cset_choice_time_ms; | |
345 size_t _pending_cards; | |
346 size_t _max_pending_cards; | |
347 | |
348 public: | |
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349 // Accessors |
342 | 350 |
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351 void set_region_eden(HeapRegion* hr, int young_index_in_cset) { |
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352 hr->set_young(); |
342 | 353 hr->install_surv_rate_group(_short_lived_surv_rate_group); |
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354 hr->set_young_index_in_cset(young_index_in_cset); |
342 | 355 } |
356 | |
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357 void set_region_survivor(HeapRegion* hr, int young_index_in_cset) { |
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358 assert(hr->is_young() && hr->is_survivor(), "pre-condition"); |
342 | 359 hr->install_surv_rate_group(_survivor_surv_rate_group); |
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360 hr->set_young_index_in_cset(young_index_in_cset); |
342 | 361 } |
362 | |
363 #ifndef PRODUCT | |
364 bool verify_young_ages(); | |
365 #endif // PRODUCT | |
366 | |
367 double get_new_prediction(TruncatedSeq* seq) { | |
368 return MAX2(seq->davg() + sigma() * seq->dsd(), | |
369 seq->davg() * confidence_factor(seq->num())); | |
370 } | |
371 | |
372 void record_max_rs_lengths(size_t rs_lengths) { | |
373 _max_rs_lengths = rs_lengths; | |
374 } | |
375 | |
376 size_t predict_pending_card_diff() { | |
377 double prediction = get_new_neg_prediction(_pending_card_diff_seq); | |
4710 | 378 if (prediction < 0.00001) { |
342 | 379 return 0; |
4710 | 380 } else { |
342 | 381 return (size_t) prediction; |
4710 | 382 } |
342 | 383 } |
384 | |
385 size_t predict_pending_cards() { | |
386 size_t max_pending_card_num = _g1->max_pending_card_num(); | |
387 size_t diff = predict_pending_card_diff(); | |
388 size_t prediction; | |
4710 | 389 if (diff > max_pending_card_num) { |
342 | 390 prediction = max_pending_card_num; |
4710 | 391 } else { |
342 | 392 prediction = max_pending_card_num - diff; |
4710 | 393 } |
342 | 394 |
395 return prediction; | |
396 } | |
397 | |
398 size_t predict_rs_length_diff() { | |
399 return (size_t) get_new_prediction(_rs_length_diff_seq); | |
400 } | |
401 | |
402 double predict_alloc_rate_ms() { | |
403 return get_new_prediction(_alloc_rate_ms_seq); | |
404 } | |
405 | |
406 double predict_cost_per_card_ms() { | |
407 return get_new_prediction(_cost_per_card_ms_seq); | |
408 } | |
409 | |
410 double predict_rs_update_time_ms(size_t pending_cards) { | |
411 return (double) pending_cards * predict_cost_per_card_ms(); | |
412 } | |
413 | |
4710 | 414 double predict_young_cards_per_entry_ratio() { |
415 return get_new_prediction(_young_cards_per_entry_ratio_seq); | |
342 | 416 } |
417 | |
4710 | 418 double predict_mixed_cards_per_entry_ratio() { |
419 if (_mixed_cards_per_entry_ratio_seq->num() < 2) { | |
420 return predict_young_cards_per_entry_ratio(); | |
421 } else { | |
422 return get_new_prediction(_mixed_cards_per_entry_ratio_seq); | |
423 } | |
342 | 424 } |
425 | |
426 size_t predict_young_card_num(size_t rs_length) { | |
427 return (size_t) ((double) rs_length * | |
4710 | 428 predict_young_cards_per_entry_ratio()); |
342 | 429 } |
430 | |
431 size_t predict_non_young_card_num(size_t rs_length) { | |
432 return (size_t) ((double) rs_length * | |
4710 | 433 predict_mixed_cards_per_entry_ratio()); |
342 | 434 } |
435 | |
436 double predict_rs_scan_time_ms(size_t card_num) { | |
4710 | 437 if (gcs_are_young()) { |
342 | 438 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); |
4710 | 439 } else { |
440 return predict_mixed_rs_scan_time_ms(card_num); | |
441 } | |
342 | 442 } |
443 | |
4710 | 444 double predict_mixed_rs_scan_time_ms(size_t card_num) { |
445 if (_mixed_cost_per_entry_ms_seq->num() < 3) { | |
342 | 446 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); |
4710 | 447 } else { |
448 return (double) (card_num * | |
449 get_new_prediction(_mixed_cost_per_entry_ms_seq)); | |
450 } | |
342 | 451 } |
452 | |
453 double predict_object_copy_time_ms_during_cm(size_t bytes_to_copy) { | |
4710 | 454 if (_cost_per_byte_ms_during_cm_seq->num() < 3) { |
455 return (1.1 * (double) bytes_to_copy) * | |
456 get_new_prediction(_cost_per_byte_ms_seq); | |
457 } else { | |
342 | 458 return (double) bytes_to_copy * |
4710 | 459 get_new_prediction(_cost_per_byte_ms_during_cm_seq); |
460 } | |
342 | 461 } |
462 | |
463 double predict_object_copy_time_ms(size_t bytes_to_copy) { | |
4710 | 464 if (_in_marking_window && !_in_marking_window_im) { |
342 | 465 return predict_object_copy_time_ms_during_cm(bytes_to_copy); |
4710 | 466 } else { |
342 | 467 return (double) bytes_to_copy * |
4710 | 468 get_new_prediction(_cost_per_byte_ms_seq); |
469 } | |
342 | 470 } |
471 | |
472 double predict_constant_other_time_ms() { | |
473 return get_new_prediction(_constant_other_time_ms_seq); | |
474 } | |
475 | |
476 double predict_young_other_time_ms(size_t young_num) { | |
4710 | 477 return (double) young_num * |
478 get_new_prediction(_young_other_cost_per_region_ms_seq); | |
342 | 479 } |
480 | |
481 double predict_non_young_other_time_ms(size_t non_young_num) { | |
4710 | 482 return (double) non_young_num * |
483 get_new_prediction(_non_young_other_cost_per_region_ms_seq); | |
342 | 484 } |
485 | |
486 double predict_base_elapsed_time_ms(size_t pending_cards); | |
487 double predict_base_elapsed_time_ms(size_t pending_cards, | |
488 size_t scanned_cards); | |
489 size_t predict_bytes_to_copy(HeapRegion* hr); | |
490 double predict_region_elapsed_time_ms(HeapRegion* hr, bool young); | |
491 | |
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492 void set_recorded_rs_lengths(size_t rs_lengths); |
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493 |
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494 uint cset_region_length() { return young_cset_region_length() + |
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495 old_cset_region_length(); } |
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496 uint young_cset_region_length() { return eden_cset_region_length() + |
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497 survivor_cset_region_length(); } |
342 | 498 |
499 void record_young_free_cset_time_ms(double time_ms) { | |
500 _recorded_young_free_cset_time_ms = time_ms; | |
501 } | |
502 | |
503 void record_non_young_free_cset_time_ms(double time_ms) { | |
504 _recorded_non_young_free_cset_time_ms = time_ms; | |
505 } | |
506 | |
545 | 507 double predict_survivor_regions_evac_time(); |
508 | |
342 | 509 void cset_regions_freed() { |
4710 | 510 bool propagate = _last_gc_was_young && !_in_marking_window; |
342 | 511 _short_lived_surv_rate_group->all_surviving_words_recorded(propagate); |
512 _survivor_surv_rate_group->all_surviving_words_recorded(propagate); | |
513 // also call it on any more surv rate groups | |
514 } | |
515 | |
516 G1MMUTracker* mmu_tracker() { | |
517 return _mmu_tracker; | |
518 } | |
519 | |
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520 double max_pause_time_ms() { |
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521 return _mmu_tracker->max_gc_time() * 1000.0; |
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522 } |
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523 |
342 | 524 double predict_remark_time_ms() { |
525 return get_new_prediction(_concurrent_mark_remark_times_ms); | |
526 } | |
527 | |
528 double predict_cleanup_time_ms() { | |
529 return get_new_prediction(_concurrent_mark_cleanup_times_ms); | |
530 } | |
531 | |
532 // Returns an estimate of the survival rate of the region at yg-age | |
533 // "yg_age". | |
545 | 534 double predict_yg_surv_rate(int age, SurvRateGroup* surv_rate_group) { |
535 TruncatedSeq* seq = surv_rate_group->get_seq(age); | |
342 | 536 if (seq->num() == 0) |
537 gclog_or_tty->print("BARF! age is %d", age); | |
538 guarantee( seq->num() > 0, "invariant" ); | |
539 double pred = get_new_prediction(seq); | |
540 if (pred > 1.0) | |
541 pred = 1.0; | |
542 return pred; | |
543 } | |
544 | |
545 | 545 double predict_yg_surv_rate(int age) { |
546 return predict_yg_surv_rate(age, _short_lived_surv_rate_group); | |
547 } | |
548 | |
342 | 549 double accum_yg_surv_rate_pred(int age) { |
550 return _short_lived_surv_rate_group->accum_surv_rate_pred(age); | |
551 } | |
552 | |
4013 | 553 private: |
1611 | 554 void print_stats(int level, const char* str, double value); |
6059 | 555 void print_stats(int level, const char* str, double value, int workers); |
1611 | 556 void print_stats(int level, const char* str, int value); |
557 | |
6059 | 558 void print_par_stats(int level, const char* str, double* data, bool showDecimals = true); |
342 | 559 |
560 void check_other_times(int level, | |
561 NumberSeq* other_times_ms, | |
562 NumberSeq* calc_other_times_ms) const; | |
563 | |
564 void print_summary (PauseSummary* stats) const; | |
565 | |
566 void print_summary (int level, const char* str, NumberSeq* seq) const; | |
567 void print_summary_sd (int level, const char* str, NumberSeq* seq) const; | |
568 | |
569 double avg_value (double* data); | |
570 double max_value (double* data); | |
571 double sum_of_values (double* data); | |
572 double max_sum (double* data1, double* data2); | |
573 | |
574 double _last_pause_time_ms; | |
575 | |
576 size_t _bytes_in_collection_set_before_gc; | |
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577 size_t _bytes_copied_during_gc; |
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578 |
342 | 579 // Used to count used bytes in CS. |
580 friend class CountCSClosure; | |
581 | |
582 // Statistics kept per GC stoppage, pause or full. | |
583 TruncatedSeq* _recent_prev_end_times_for_all_gcs_sec; | |
584 | |
585 // Add a new GC of the given duration and end time to the record. | |
586 void update_recent_gc_times(double end_time_sec, double elapsed_ms); | |
587 | |
588 // The head of the list (via "next_in_collection_set()") representing the | |
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589 // current collection set. Set from the incrementally built collection |
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590 // set at the start of the pause. |
342 | 591 HeapRegion* _collection_set; |
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592 |
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593 // The number of bytes in the collection set before the pause. Set from |
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594 // the incrementally built collection set at the start of an evacuation |
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595 // pause. |
342 | 596 size_t _collection_set_bytes_used_before; |
597 | |
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598 // The associated information that is maintained while the incremental |
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599 // collection set is being built with young regions. Used to populate |
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600 // the recorded info for the evacuation pause. |
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601 |
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602 enum CSetBuildType { |
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603 Active, // We are actively building the collection set |
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604 Inactive // We are not actively building the collection set |
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605 }; |
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606 |
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607 CSetBuildType _inc_cset_build_state; |
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608 |
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609 // The head of the incrementally built collection set. |
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610 HeapRegion* _inc_cset_head; |
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611 |
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612 // The tail of the incrementally built collection set. |
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613 HeapRegion* _inc_cset_tail; |
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614 |
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615 // The number of bytes in the incrementally built collection set. |
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616 // Used to set _collection_set_bytes_used_before at the start of |
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617 // an evacuation pause. |
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618 size_t _inc_cset_bytes_used_before; |
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619 |
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620 // Used to record the highest end of heap region in collection set |
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621 HeapWord* _inc_cset_max_finger; |
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622 |
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623 // The RSet lengths recorded for regions in the CSet. It is updated |
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624 // by the thread that adds a new region to the CSet. We assume that |
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625 // only one thread can be allocating a new CSet region (currently, |
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626 // it does so after taking the Heap_lock) hence no need to |
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627 // synchronize updates to this field. |
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628 size_t _inc_cset_recorded_rs_lengths; |
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629 |
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630 // A concurrent refinement thread periodcially samples the young |
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631 // region RSets and needs to update _inc_cset_recorded_rs_lengths as |
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632 // the RSets grow. Instead of having to syncronize updates to that |
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633 // field we accumulate them in this field and add it to |
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634 // _inc_cset_recorded_rs_lengths_diffs at the start of a GC. |
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635 ssize_t _inc_cset_recorded_rs_lengths_diffs; |
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636 |
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637 // The predicted elapsed time it will take to collect the regions in |
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638 // the CSet. This is updated by the thread that adds a new region to |
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639 // the CSet. See the comment for _inc_cset_recorded_rs_lengths about |
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640 // MT-safety assumptions. |
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641 double _inc_cset_predicted_elapsed_time_ms; |
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642 |
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643 // See the comment for _inc_cset_recorded_rs_lengths_diffs. |
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644 double _inc_cset_predicted_elapsed_time_ms_diffs; |
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645 |
342 | 646 // Stash a pointer to the g1 heap. |
647 G1CollectedHeap* _g1; | |
648 | |
649 // The ratio of gc time to elapsed time, computed over recent pauses. | |
650 double _recent_avg_pause_time_ratio; | |
651 | |
652 double recent_avg_pause_time_ratio() { | |
653 return _recent_avg_pause_time_ratio; | |
654 } | |
655 | |
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656 // At the end of a pause we check the heap occupancy and we decide |
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657 // whether we will start a marking cycle during the next pause. If |
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658 // we decide that we want to do that, we will set this parameter to |
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659 // true. So, this parameter will stay true between the end of a |
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660 // pause and the beginning of a subsequent pause (not necessarily |
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661 // the next one, see the comments on the next field) when we decide |
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662 // that we will indeed start a marking cycle and do the initial-mark |
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663 // work. |
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664 volatile bool _initiate_conc_mark_if_possible; |
342 | 665 |
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666 // If initiate_conc_mark_if_possible() is set at the beginning of a |
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667 // pause, it is a suggestion that the pause should start a marking |
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668 // cycle by doing the initial-mark work. However, it is possible |
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669 // that the concurrent marking thread is still finishing up the |
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670 // previous marking cycle (e.g., clearing the next marking |
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671 // bitmap). If that is the case we cannot start a new cycle and |
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672 // we'll have to wait for the concurrent marking thread to finish |
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673 // what it is doing. In this case we will postpone the marking cycle |
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674 // initiation decision for the next pause. When we eventually decide |
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675 // to start a cycle, we will set _during_initial_mark_pause which |
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676 // will stay true until the end of the initial-mark pause and it's |
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677 // the condition that indicates that a pause is doing the |
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678 // initial-mark work. |
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679 volatile bool _during_initial_mark_pause; |
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680 |
4710 | 681 bool _last_young_gc; |
342 | 682 |
683 // This set of variables tracks the collector efficiency, in order to | |
684 // determine whether we should initiate a new marking. | |
685 double _cur_mark_stop_world_time_ms; | |
686 double _mark_remark_start_sec; | |
687 double _mark_cleanup_start_sec; | |
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688 double _root_region_scan_wait_time_ms; |
342 | 689 |
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690 // Update the young list target length either by setting it to the |
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691 // desired fixed value or by calculating it using G1's pause |
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692 // prediction model. If no rs_lengths parameter is passed, predict |
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693 // the RS lengths using the prediction model, otherwise use the |
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694 // given rs_lengths as the prediction. |
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695 void update_young_list_target_length(size_t rs_lengths = (size_t) -1); |
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696 |
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697 // Calculate and return the minimum desired young list target |
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698 // length. This is the minimum desired young list length according |
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699 // to the user's inputs. |
6010
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700 uint calculate_young_list_desired_min_length(uint base_min_length); |
3919
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701 |
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702 // Calculate and return the maximum desired young list target |
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703 // length. This is the maximum desired young list length according |
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704 // to the user's inputs. |
6010
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705 uint calculate_young_list_desired_max_length(); |
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706 |
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707 // Calculate and return the maximum young list target length that |
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708 // can fit into the pause time goal. The parameters are: rs_lengths |
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709 // represent the prediction of how large the young RSet lengths will |
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710 // be, base_min_length is the alreay existing number of regions in |
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711 // the young list, min_length and max_length are the desired min and |
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712 // max young list length according to the user's inputs. |
6010
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713 uint calculate_young_list_target_length(size_t rs_lengths, |
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714 uint base_min_length, |
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715 uint desired_min_length, |
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716 uint desired_max_length); |
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717 |
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718 // Check whether a given young length (young_length) fits into the |
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719 // given target pause time and whether the prediction for the amount |
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720 // of objects to be copied for the given length will fit into the |
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721 // given free space (expressed by base_free_regions). It is used by |
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722 // calculate_young_list_target_length(). |
6010
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723 bool predict_will_fit(uint young_length, double base_time_ms, |
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724 uint base_free_regions, double target_pause_time_ms); |
342 | 725 |
4013 | 726 // Count the number of bytes used in the CS. |
727 void count_CS_bytes_used(); | |
728 | |
342 | 729 public: |
730 | |
731 G1CollectorPolicy(); | |
732 | |
733 virtual G1CollectorPolicy* as_g1_policy() { return this; } | |
734 | |
735 virtual CollectorPolicy::Name kind() { | |
736 return CollectorPolicy::G1CollectorPolicyKind; | |
737 } | |
738 | |
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739 // Check the current value of the young list RSet lengths and |
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740 // compare it against the last prediction. If the current value is |
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741 // higher, recalculate the young list target length prediction. |
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742 void revise_young_list_target_length_if_necessary(); |
342 | 743 |
744 size_t bytes_in_collection_set() { | |
745 return _bytes_in_collection_set_before_gc; | |
746 } | |
747 | |
748 unsigned calc_gc_alloc_time_stamp() { | |
749 return _all_pause_times_ms->num() + 1; | |
750 } | |
751 | |
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752 // This should be called after the heap is resized. |
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753 void record_new_heap_size(uint new_number_of_regions); |
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754 |
4013 | 755 void init(); |
342 | 756 |
545 | 757 // Create jstat counters for the policy. |
758 virtual void initialize_gc_policy_counters(); | |
759 | |
342 | 760 virtual HeapWord* mem_allocate_work(size_t size, |
761 bool is_tlab, | |
762 bool* gc_overhead_limit_was_exceeded); | |
763 | |
764 // This method controls how a collector handles one or more | |
765 // of its generations being fully allocated. | |
766 virtual HeapWord* satisfy_failed_allocation(size_t size, | |
767 bool is_tlab); | |
768 | |
769 BarrierSet::Name barrier_set_name() { return BarrierSet::G1SATBCTLogging; } | |
770 | |
771 GenRemSet::Name rem_set_name() { return GenRemSet::CardTable; } | |
772 | |
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773 bool need_to_start_conc_mark(const char* source, size_t alloc_word_size = 0); |
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774 |
342 | 775 // Update the heuristic info to record a collection pause of the given |
776 // start time, where the given number of bytes were used at the start. | |
777 // This may involve changing the desired size of a collection set. | |
778 | |
4013 | 779 void record_stop_world_start(); |
342 | 780 |
4013 | 781 void record_collection_pause_start(double start_time_sec, size_t start_used); |
342 | 782 |
783 // Must currently be called while the world is stopped. | |
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784 void record_concurrent_mark_init_end(double |
342 | 785 mark_init_elapsed_time_ms); |
786 | |
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787 void record_root_region_scan_wait_time(double time_ms) { |
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788 _root_region_scan_wait_time_ms = time_ms; |
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789 } |
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790 |
4013 | 791 void record_concurrent_mark_remark_start(); |
792 void record_concurrent_mark_remark_end(); | |
342 | 793 |
4013 | 794 void record_concurrent_mark_cleanup_start(); |
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795 void record_concurrent_mark_cleanup_end(int no_of_gc_threads); |
4013 | 796 void record_concurrent_mark_cleanup_completed(); |
342 | 797 |
4013 | 798 void record_concurrent_pause(); |
799 void record_concurrent_pause_end(); | |
342 | 800 |
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801 void record_collection_pause_end(int no_of_gc_threads); |
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802 void print_heap_transition(); |
342 | 803 |
804 // Record the fact that a full collection occurred. | |
4013 | 805 void record_full_collection_start(); |
806 void record_full_collection_end(); | |
342 | 807 |
1611 | 808 void record_gc_worker_start_time(int worker_i, double ms) { |
809 _par_last_gc_worker_start_times_ms[worker_i] = ms; | |
810 } | |
811 | |
342 | 812 void record_ext_root_scan_time(int worker_i, double ms) { |
813 _par_last_ext_root_scan_times_ms[worker_i] = ms; | |
814 } | |
815 | |
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816 void record_satb_filtering_time(int worker_i, double ms) { |
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817 _par_last_satb_filtering_times_ms[worker_i] = ms; |
342 | 818 } |
819 | |
820 void record_update_rs_time(int thread, double ms) { | |
821 _par_last_update_rs_times_ms[thread] = ms; | |
822 } | |
823 | |
824 void record_update_rs_processed_buffers (int thread, | |
825 double processed_buffers) { | |
826 _par_last_update_rs_processed_buffers[thread] = processed_buffers; | |
827 } | |
828 | |
829 void record_scan_rs_time(int thread, double ms) { | |
830 _par_last_scan_rs_times_ms[thread] = ms; | |
831 } | |
832 | |
833 void reset_obj_copy_time(int thread) { | |
834 _par_last_obj_copy_times_ms[thread] = 0.0; | |
835 } | |
836 | |
837 void reset_obj_copy_time() { | |
838 reset_obj_copy_time(0); | |
839 } | |
840 | |
841 void record_obj_copy_time(int thread, double ms) { | |
842 _par_last_obj_copy_times_ms[thread] += ms; | |
843 } | |
844 | |
1611 | 845 void record_termination(int thread, double ms, size_t attempts) { |
846 _par_last_termination_times_ms[thread] = ms; | |
847 _par_last_termination_attempts[thread] = (double) attempts; | |
342 | 848 } |
849 | |
1611 | 850 void record_gc_worker_end_time(int worker_i, double ms) { |
851 _par_last_gc_worker_end_times_ms[worker_i] = ms; | |
342 | 852 } |
853 | |
595
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854 void record_pause_time_ms(double ms) { |
342 | 855 _last_pause_time_ms = ms; |
856 } | |
857 | |
858 void record_clear_ct_time(double ms) { | |
859 _cur_clear_ct_time_ms = ms; | |
860 } | |
861 | |
862 void record_par_time(double ms) { | |
863 _cur_collection_par_time_ms = ms; | |
864 } | |
865 | |
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866 void record_code_root_fixup_time(double ms) { |
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867 _cur_collection_code_root_fixup_time_ms = ms; |
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868 } |
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869 |
342 | 870 void record_aux_start_time(int i) { |
871 guarantee(i < _aux_num, "should be within range"); | |
872 _cur_aux_start_times_ms[i] = os::elapsedTime() * 1000.0; | |
873 } | |
874 | |
875 void record_aux_end_time(int i) { | |
876 guarantee(i < _aux_num, "should be within range"); | |
877 double ms = os::elapsedTime() * 1000.0 - _cur_aux_start_times_ms[i]; | |
878 _cur_aux_times_set[i] = true; | |
879 _cur_aux_times_ms[i] += ms; | |
880 } | |
881 | |
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882 void record_ref_proc_time(double ms) { |
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883 _cur_ref_proc_time_ms = ms; |
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884 } |
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885 |
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886 void record_ref_enq_time(double ms) { |
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887 _cur_ref_enq_time_ms = ms; |
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888 } |
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889 |
890
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|
890 #ifndef PRODUCT |
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891 void record_cc_clear_time(double ms) { |
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892 if (_min_clear_cc_time_ms < 0.0 || ms <= _min_clear_cc_time_ms) |
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893 _min_clear_cc_time_ms = ms; |
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894 if (_max_clear_cc_time_ms < 0.0 || ms >= _max_clear_cc_time_ms) |
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895 _max_clear_cc_time_ms = ms; |
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896 _cur_clear_cc_time_ms = ms; |
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897 _cum_clear_cc_time_ms += ms; |
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|
898 _num_cc_clears++; |
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|
899 } |
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|
900 #endif |
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|
901 |
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902 // Record how much space we copied during a GC. This is typically |
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903 // called when a GC alloc region is being retired. |
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904 void record_bytes_copied_during_gc(size_t bytes) { |
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905 _bytes_copied_during_gc += bytes; |
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|
906 } |
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907 |
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|
908 // The amount of space we copied during a GC. |
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|
909 size_t bytes_copied_during_gc() { |
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|
910 return _bytes_copied_during_gc; |
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911 } |
342 | 912 |
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913 // Determine whether there are candidate regions so that the |
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914 // next GC should be mixed. The two action strings are used |
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915 // in the ergo output when the method returns true or false. |
4912
a9647476d1a4
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|
916 bool next_gc_should_be_mixed(const char* true_action_str, |
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7132029: G1: mixed GC phase lasts for longer than it should
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917 const char* false_action_str); |
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918 |
342 | 919 // Choose a new collection set. Marks the chosen regions as being |
920 // "in_collection_set", and links them together. The head and number of | |
921 // the collection set are available via access methods. | |
4912
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922 void finalize_cset(double target_pause_time_ms); |
342 | 923 |
924 // The head of the list (via "next_in_collection_set()") representing the | |
925 // current collection set. | |
926 HeapRegion* collection_set() { return _collection_set; } | |
927 | |
1394
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928 void clear_collection_set() { _collection_set = NULL; } |
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929 |
4090
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930 // Add old region "hr" to the CSet. |
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931 void add_old_region_to_cset(HeapRegion* hr); |
342 | 932 |
1394
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|
933 // Incremental CSet Support |
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|
934 |
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935 // The head of the incrementally built collection set. |
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936 HeapRegion* inc_cset_head() { return _inc_cset_head; } |
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937 |
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938 // The tail of the incrementally built collection set. |
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939 HeapRegion* inc_set_tail() { return _inc_cset_tail; } |
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940 |
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941 // Initialize incremental collection set info. |
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942 void start_incremental_cset_building(); |
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|
943 |
4727
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944 // Perform any final calculations on the incremental CSet fields |
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945 // before we can use them. |
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946 void finalize_incremental_cset_building(); |
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|
947 |
1394
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948 void clear_incremental_cset() { |
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949 _inc_cset_head = NULL; |
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|
950 _inc_cset_tail = NULL; |
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951 } |
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952 |
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953 // Stop adding regions to the incremental collection set |
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954 void stop_incremental_cset_building() { _inc_cset_build_state = Inactive; } |
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955 |
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956 // Add information about hr to the aggregated information for the |
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957 // incrementally built collection set. |
1394
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958 void add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length); |
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959 |
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960 // Update information about hr in the aggregated information for |
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961 // the incrementally built collection set. |
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962 void update_incremental_cset_info(HeapRegion* hr, size_t new_rs_length); |
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963 |
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964 private: |
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965 // Update the incremental cset information when adding a region |
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966 // (should not be called directly). |
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967 void add_region_to_incremental_cset_common(HeapRegion* hr); |
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968 |
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969 public: |
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970 // Add hr to the LHS of the incremental collection set. |
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971 void add_region_to_incremental_cset_lhs(HeapRegion* hr); |
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972 |
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973 // Add hr to the RHS of the incremental collection set. |
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974 void add_region_to_incremental_cset_rhs(HeapRegion* hr); |
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975 |
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976 #ifndef PRODUCT |
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977 void print_collection_set(HeapRegion* list_head, outputStream* st); |
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978 #endif // !PRODUCT |
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979 |
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980 bool initiate_conc_mark_if_possible() { return _initiate_conc_mark_if_possible; } |
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981 void set_initiate_conc_mark_if_possible() { _initiate_conc_mark_if_possible = true; } |
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982 void clear_initiate_conc_mark_if_possible() { _initiate_conc_mark_if_possible = false; } |
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983 |
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984 bool during_initial_mark_pause() { return _during_initial_mark_pause; } |
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985 void set_during_initial_mark_pause() { _during_initial_mark_pause = true; } |
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986 void clear_during_initial_mark_pause(){ _during_initial_mark_pause = false; } |
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987 |
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988 // This sets the initiate_conc_mark_if_possible() flag to start a |
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989 // new cycle, as long as we are not already in one. It's best if it |
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990 // is called during a safepoint when the test whether a cycle is in |
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991 // progress or not is stable. |
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992 bool force_initial_mark_if_outside_cycle(GCCause::Cause gc_cause); |
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993 |
1359
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994 // This is called at the very beginning of an evacuation pause (it |
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995 // has to be the first thing that the pause does). If |
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996 // initiate_conc_mark_if_possible() is true, and the concurrent |
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997 // marking thread has completed its work during the previous cycle, |
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998 // it will set during_initial_mark_pause() to so that the pause does |
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999 // the initial-mark work and start a marking cycle. |
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1000 void decide_on_conc_mark_initiation(); |
342 | 1001 |
1002 // If an expansion would be appropriate, because recent GC overhead had | |
1003 // exceeded the desired limit, return an amount to expand by. | |
4013 | 1004 size_t expansion_amount(); |
342 | 1005 |
1006 // Print tracing information. | |
1007 void print_tracing_info() const; | |
1008 | |
1009 // Print stats on young survival ratio | |
1010 void print_yg_surv_rate_info() const; | |
1011 | |
545 | 1012 void finished_recalculating_age_indexes(bool is_survivors) { |
1013 if (is_survivors) { | |
1014 _survivor_surv_rate_group->finished_recalculating_age_indexes(); | |
1015 } else { | |
1016 _short_lived_surv_rate_group->finished_recalculating_age_indexes(); | |
1017 } | |
342 | 1018 // do that for any other surv rate groups |
1019 } | |
1020 | |
1973 | 1021 bool is_young_list_full() { |
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1022 uint young_list_length = _g1->young_list()->length(); |
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1023 uint young_list_target_length = _young_list_target_length; |
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1024 return young_list_length >= young_list_target_length; |
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1025 } |
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1026 |
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1027 bool can_expand_young_list() { |
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1028 uint young_list_length = _g1->young_list()->length(); |
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1029 uint young_list_max_length = _young_list_max_length; |
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1030 return young_list_length < young_list_max_length; |
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1031 } |
1973 | 1032 |
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1033 uint young_list_max_length() { |
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1034 return _young_list_max_length; |
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1035 } |
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1036 |
4710 | 1037 bool gcs_are_young() { |
1038 return _gcs_are_young; | |
342 | 1039 } |
4710 | 1040 void set_gcs_are_young(bool gcs_are_young) { |
1041 _gcs_are_young = gcs_are_young; | |
342 | 1042 } |
1043 | |
1044 bool adaptive_young_list_length() { | |
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1045 return _young_gen_sizer->adaptive_young_list_length(); |
342 | 1046 } |
1047 | |
4013 | 1048 private: |
342 | 1049 // |
1050 // Survivor regions policy. | |
1051 // | |
1052 | |
1053 // Current tenuring threshold, set to 0 if the collector reaches the | |
1054 // maximum amount of suvivors regions. | |
1055 int _tenuring_threshold; | |
1056 | |
545 | 1057 // The limit on the number of regions allocated for survivors. |
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1058 uint _max_survivor_regions; |
545 | 1059 |
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1060 // For reporting purposes. |
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1061 size_t _eden_bytes_before_gc; |
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1062 size_t _survivor_bytes_before_gc; |
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1063 size_t _capacity_before_gc; |
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1064 |
545 | 1065 // The amount of survor regions after a collection. |
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1066 uint _recorded_survivor_regions; |
545 | 1067 // List of survivor regions. |
1068 HeapRegion* _recorded_survivor_head; | |
1069 HeapRegion* _recorded_survivor_tail; | |
1070 | |
1071 ageTable _survivors_age_table; | |
1072 | |
342 | 1073 public: |
1074 | |
1075 inline GCAllocPurpose | |
1076 evacuation_destination(HeapRegion* src_region, int age, size_t word_sz) { | |
1077 if (age < _tenuring_threshold && src_region->is_young()) { | |
1078 return GCAllocForSurvived; | |
1079 } else { | |
1080 return GCAllocForTenured; | |
1081 } | |
1082 } | |
1083 | |
1084 inline bool track_object_age(GCAllocPurpose purpose) { | |
1085 return purpose == GCAllocForSurvived; | |
1086 } | |
1087 | |
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1088 static const uint REGIONS_UNLIMITED = (uint) -1; |
545 | 1089 |
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1090 uint max_regions(int purpose); |
342 | 1091 |
1092 // The limit on regions for a particular purpose is reached. | |
1093 void note_alloc_region_limit_reached(int purpose) { | |
1094 if (purpose == GCAllocForSurvived) { | |
1095 _tenuring_threshold = 0; | |
1096 } | |
1097 } | |
1098 | |
1099 void note_start_adding_survivor_regions() { | |
1100 _survivor_surv_rate_group->start_adding_regions(); | |
1101 } | |
1102 | |
1103 void note_stop_adding_survivor_regions() { | |
1104 _survivor_surv_rate_group->stop_adding_regions(); | |
1105 } | |
545 | 1106 |
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1107 void record_survivor_regions(uint regions, |
545 | 1108 HeapRegion* head, |
1109 HeapRegion* tail) { | |
1110 _recorded_survivor_regions = regions; | |
1111 _recorded_survivor_head = head; | |
1112 _recorded_survivor_tail = tail; | |
1113 } | |
1114 | |
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1115 uint recorded_survivor_regions() { |
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1116 return _recorded_survivor_regions; |
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1117 } |
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1118 |
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1119 void record_thread_age_table(ageTable* age_table) { |
545 | 1120 _survivors_age_table.merge_par(age_table); |
1121 } | |
1122 | |
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1123 void update_max_gc_locker_expansion(); |
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1124 |
545 | 1125 // Calculates survivor space parameters. |
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1126 void update_survivors_policy(); |
545 | 1127 |
342 | 1128 }; |
1129 | |
1130 // This should move to some place more general... | |
1131 | |
1132 // If we have "n" measurements, and we've kept track of their "sum" and the | |
1133 // "sum_of_squares" of the measurements, this returns the variance of the | |
1134 // sequence. | |
1135 inline double variance(int n, double sum_of_squares, double sum) { | |
1136 double n_d = (double)n; | |
1137 double avg = sum/n_d; | |
1138 return (sum_of_squares - 2.0 * avg * sum + n_d * avg * avg) / n_d; | |
1139 } | |
1140 | |
1972 | 1141 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTORPOLICY_HPP |