Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.hpp @ 5988:2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
Summary: Removed lots of dead code after some recent conc mark changes.
Reviewed-by: brutisso, johnc
author | tonyp |
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date | Thu, 05 Apr 2012 13:57:23 -0400 |
parents | 500023bd0818 |
children | 720b6a76dd9d |
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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 | |
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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 size_t _min_desired_young_length; |
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132 size_t _max_desired_young_length; |
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133 bool _adaptive_size; |
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134 size_t calculate_default_min_length(size_t new_number_of_heap_regions); |
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135 size_t calculate_default_max_length(size_t 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(size_t new_number_of_heap_regions); |
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140 size_t min_desired_young_length() { |
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141 return _min_desired_young_length; |
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142 } |
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143 size_t 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; | |
178 size_t _cur_collection_pause_used_regions_at_start; | |
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 |
236 size_t _young_list_target_length; | |
237 size_t _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 size_t _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 size_t _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 | |
291 TruncatedSeq* _young_gc_eff_seq; | |
292 | |
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293 G1YoungGenSizer* _young_gen_sizer; |
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294 |
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295 size_t _eden_cset_region_length; |
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296 size_t _survivor_cset_region_length; |
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297 size_t _old_cset_region_length; |
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298 |
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299 void init_cset_region_lengths(size_t eden_cset_region_length, |
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300 size_t survivor_cset_region_length); |
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301 |
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302 size_t eden_cset_region_length() { return _eden_cset_region_length; } |
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303 size_t survivor_cset_region_length() { return _survivor_cset_region_length; } |
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304 size_t old_cset_region_length() { return _old_cset_region_length; } |
342 | 305 |
306 size_t _free_regions_at_end_of_collection; | |
307 | |
308 size_t _recorded_rs_lengths; | |
309 size_t _max_rs_lengths; | |
310 | |
311 double _recorded_young_free_cset_time_ms; | |
312 double _recorded_non_young_free_cset_time_ms; | |
313 | |
314 double _sigma; | |
315 | |
316 size_t _rs_lengths_prediction; | |
317 | |
318 size_t _known_garbage_bytes; | |
319 double _known_garbage_ratio; | |
320 | |
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321 double sigma() { return _sigma; } |
342 | 322 |
323 // A function that prevents us putting too much stock in small sample | |
324 // sets. Returns a number between 2.0 and 1.0, depending on the number | |
325 // of samples. 5 or more samples yields one; fewer scales linearly from | |
326 // 2.0 at 1 sample to 1.0 at 5. | |
327 double confidence_factor(int samples) { | |
328 if (samples > 4) return 1.0; | |
329 else return 1.0 + sigma() * ((double)(5 - samples))/2.0; | |
330 } | |
331 | |
332 double get_new_neg_prediction(TruncatedSeq* seq) { | |
333 return seq->davg() - sigma() * seq->dsd(); | |
334 } | |
335 | |
336 #ifndef PRODUCT | |
337 bool verify_young_ages(HeapRegion* head, SurvRateGroup *surv_rate_group); | |
338 #endif // PRODUCT | |
339 | |
1111 | 340 void adjust_concurrent_refinement(double update_rs_time, |
341 double update_rs_processed_buffers, | |
342 double goal_ms); | |
343 | |
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344 uintx no_of_gc_threads() { return _no_of_gc_threads; } |
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345 void set_no_of_gc_threads(uintx v) { _no_of_gc_threads = v; } |
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346 |
342 | 347 double _pause_time_target_ms; |
348 double _recorded_young_cset_choice_time_ms; | |
349 double _recorded_non_young_cset_choice_time_ms; | |
350 size_t _pending_cards; | |
351 size_t _max_pending_cards; | |
352 | |
353 public: | |
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354 // Accessors |
342 | 355 |
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356 void set_region_eden(HeapRegion* hr, int young_index_in_cset) { |
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357 hr->set_young(); |
342 | 358 hr->install_surv_rate_group(_short_lived_surv_rate_group); |
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359 hr->set_young_index_in_cset(young_index_in_cset); |
342 | 360 } |
361 | |
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362 void set_region_survivor(HeapRegion* hr, int young_index_in_cset) { |
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363 assert(hr->is_young() && hr->is_survivor(), "pre-condition"); |
342 | 364 hr->install_surv_rate_group(_survivor_surv_rate_group); |
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365 hr->set_young_index_in_cset(young_index_in_cset); |
342 | 366 } |
367 | |
368 #ifndef PRODUCT | |
369 bool verify_young_ages(); | |
370 #endif // PRODUCT | |
371 | |
372 double get_new_prediction(TruncatedSeq* seq) { | |
373 return MAX2(seq->davg() + sigma() * seq->dsd(), | |
374 seq->davg() * confidence_factor(seq->num())); | |
375 } | |
376 | |
377 void record_max_rs_lengths(size_t rs_lengths) { | |
378 _max_rs_lengths = rs_lengths; | |
379 } | |
380 | |
381 size_t predict_pending_card_diff() { | |
382 double prediction = get_new_neg_prediction(_pending_card_diff_seq); | |
4710 | 383 if (prediction < 0.00001) { |
342 | 384 return 0; |
4710 | 385 } else { |
342 | 386 return (size_t) prediction; |
4710 | 387 } |
342 | 388 } |
389 | |
390 size_t predict_pending_cards() { | |
391 size_t max_pending_card_num = _g1->max_pending_card_num(); | |
392 size_t diff = predict_pending_card_diff(); | |
393 size_t prediction; | |
4710 | 394 if (diff > max_pending_card_num) { |
342 | 395 prediction = max_pending_card_num; |
4710 | 396 } else { |
342 | 397 prediction = max_pending_card_num - diff; |
4710 | 398 } |
342 | 399 |
400 return prediction; | |
401 } | |
402 | |
403 size_t predict_rs_length_diff() { | |
404 return (size_t) get_new_prediction(_rs_length_diff_seq); | |
405 } | |
406 | |
407 double predict_alloc_rate_ms() { | |
408 return get_new_prediction(_alloc_rate_ms_seq); | |
409 } | |
410 | |
411 double predict_cost_per_card_ms() { | |
412 return get_new_prediction(_cost_per_card_ms_seq); | |
413 } | |
414 | |
415 double predict_rs_update_time_ms(size_t pending_cards) { | |
416 return (double) pending_cards * predict_cost_per_card_ms(); | |
417 } | |
418 | |
4710 | 419 double predict_young_cards_per_entry_ratio() { |
420 return get_new_prediction(_young_cards_per_entry_ratio_seq); | |
342 | 421 } |
422 | |
4710 | 423 double predict_mixed_cards_per_entry_ratio() { |
424 if (_mixed_cards_per_entry_ratio_seq->num() < 2) { | |
425 return predict_young_cards_per_entry_ratio(); | |
426 } else { | |
427 return get_new_prediction(_mixed_cards_per_entry_ratio_seq); | |
428 } | |
342 | 429 } |
430 | |
431 size_t predict_young_card_num(size_t rs_length) { | |
432 return (size_t) ((double) rs_length * | |
4710 | 433 predict_young_cards_per_entry_ratio()); |
342 | 434 } |
435 | |
436 size_t predict_non_young_card_num(size_t rs_length) { | |
437 return (size_t) ((double) rs_length * | |
4710 | 438 predict_mixed_cards_per_entry_ratio()); |
342 | 439 } |
440 | |
441 double predict_rs_scan_time_ms(size_t card_num) { | |
4710 | 442 if (gcs_are_young()) { |
342 | 443 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); |
4710 | 444 } else { |
445 return predict_mixed_rs_scan_time_ms(card_num); | |
446 } | |
342 | 447 } |
448 | |
4710 | 449 double predict_mixed_rs_scan_time_ms(size_t card_num) { |
450 if (_mixed_cost_per_entry_ms_seq->num() < 3) { | |
342 | 451 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); |
4710 | 452 } else { |
453 return (double) (card_num * | |
454 get_new_prediction(_mixed_cost_per_entry_ms_seq)); | |
455 } | |
342 | 456 } |
457 | |
458 double predict_object_copy_time_ms_during_cm(size_t bytes_to_copy) { | |
4710 | 459 if (_cost_per_byte_ms_during_cm_seq->num() < 3) { |
460 return (1.1 * (double) bytes_to_copy) * | |
461 get_new_prediction(_cost_per_byte_ms_seq); | |
462 } else { | |
342 | 463 return (double) bytes_to_copy * |
4710 | 464 get_new_prediction(_cost_per_byte_ms_during_cm_seq); |
465 } | |
342 | 466 } |
467 | |
468 double predict_object_copy_time_ms(size_t bytes_to_copy) { | |
4710 | 469 if (_in_marking_window && !_in_marking_window_im) { |
342 | 470 return predict_object_copy_time_ms_during_cm(bytes_to_copy); |
4710 | 471 } else { |
342 | 472 return (double) bytes_to_copy * |
4710 | 473 get_new_prediction(_cost_per_byte_ms_seq); |
474 } | |
342 | 475 } |
476 | |
477 double predict_constant_other_time_ms() { | |
478 return get_new_prediction(_constant_other_time_ms_seq); | |
479 } | |
480 | |
481 double predict_young_other_time_ms(size_t young_num) { | |
4710 | 482 return (double) young_num * |
483 get_new_prediction(_young_other_cost_per_region_ms_seq); | |
342 | 484 } |
485 | |
486 double predict_non_young_other_time_ms(size_t non_young_num) { | |
4710 | 487 return (double) non_young_num * |
488 get_new_prediction(_non_young_other_cost_per_region_ms_seq); | |
342 | 489 } |
490 | |
491 double predict_base_elapsed_time_ms(size_t pending_cards); | |
492 double predict_base_elapsed_time_ms(size_t pending_cards, | |
493 size_t scanned_cards); | |
494 size_t predict_bytes_to_copy(HeapRegion* hr); | |
495 double predict_region_elapsed_time_ms(HeapRegion* hr, bool young); | |
496 | |
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497 void set_recorded_rs_lengths(size_t rs_lengths); |
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498 |
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499 size_t cset_region_length() { return young_cset_region_length() + |
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500 old_cset_region_length(); } |
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501 size_t young_cset_region_length() { return eden_cset_region_length() + |
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502 survivor_cset_region_length(); } |
342 | 503 |
504 void record_young_free_cset_time_ms(double time_ms) { | |
505 _recorded_young_free_cset_time_ms = time_ms; | |
506 } | |
507 | |
508 void record_non_young_free_cset_time_ms(double time_ms) { | |
509 _recorded_non_young_free_cset_time_ms = time_ms; | |
510 } | |
511 | |
512 double predict_young_gc_eff() { | |
513 return get_new_neg_prediction(_young_gc_eff_seq); | |
514 } | |
515 | |
545 | 516 double predict_survivor_regions_evac_time(); |
517 | |
342 | 518 void cset_regions_freed() { |
4710 | 519 bool propagate = _last_gc_was_young && !_in_marking_window; |
342 | 520 _short_lived_surv_rate_group->all_surviving_words_recorded(propagate); |
521 _survivor_surv_rate_group->all_surviving_words_recorded(propagate); | |
522 // also call it on any more surv rate groups | |
523 } | |
524 | |
525 void set_known_garbage_bytes(size_t known_garbage_bytes) { | |
526 _known_garbage_bytes = known_garbage_bytes; | |
527 size_t heap_bytes = _g1->capacity(); | |
528 _known_garbage_ratio = (double) _known_garbage_bytes / (double) heap_bytes; | |
529 } | |
530 | |
531 void decrease_known_garbage_bytes(size_t known_garbage_bytes) { | |
532 guarantee( _known_garbage_bytes >= known_garbage_bytes, "invariant" ); | |
533 | |
534 _known_garbage_bytes -= known_garbage_bytes; | |
535 size_t heap_bytes = _g1->capacity(); | |
536 _known_garbage_ratio = (double) _known_garbage_bytes / (double) heap_bytes; | |
537 } | |
538 | |
539 G1MMUTracker* mmu_tracker() { | |
540 return _mmu_tracker; | |
541 } | |
542 | |
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543 double max_pause_time_ms() { |
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544 return _mmu_tracker->max_gc_time() * 1000.0; |
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545 } |
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546 |
342 | 547 double predict_remark_time_ms() { |
548 return get_new_prediction(_concurrent_mark_remark_times_ms); | |
549 } | |
550 | |
551 double predict_cleanup_time_ms() { | |
552 return get_new_prediction(_concurrent_mark_cleanup_times_ms); | |
553 } | |
554 | |
555 // Returns an estimate of the survival rate of the region at yg-age | |
556 // "yg_age". | |
545 | 557 double predict_yg_surv_rate(int age, SurvRateGroup* surv_rate_group) { |
558 TruncatedSeq* seq = surv_rate_group->get_seq(age); | |
342 | 559 if (seq->num() == 0) |
560 gclog_or_tty->print("BARF! age is %d", age); | |
561 guarantee( seq->num() > 0, "invariant" ); | |
562 double pred = get_new_prediction(seq); | |
563 if (pred > 1.0) | |
564 pred = 1.0; | |
565 return pred; | |
566 } | |
567 | |
545 | 568 double predict_yg_surv_rate(int age) { |
569 return predict_yg_surv_rate(age, _short_lived_surv_rate_group); | |
570 } | |
571 | |
342 | 572 double accum_yg_surv_rate_pred(int age) { |
573 return _short_lived_surv_rate_group->accum_surv_rate_pred(age); | |
574 } | |
575 | |
4013 | 576 private: |
1611 | 577 void print_stats(int level, const char* str, double value); |
578 void print_stats(int level, const char* str, int value); | |
579 | |
2430 | 580 void print_par_stats(int level, const char* str, double* data); |
581 void print_par_sizes(int level, const char* str, double* data); | |
342 | 582 |
583 void check_other_times(int level, | |
584 NumberSeq* other_times_ms, | |
585 NumberSeq* calc_other_times_ms) const; | |
586 | |
587 void print_summary (PauseSummary* stats) const; | |
588 | |
589 void print_summary (int level, const char* str, NumberSeq* seq) const; | |
590 void print_summary_sd (int level, const char* str, NumberSeq* seq) const; | |
591 | |
592 double avg_value (double* data); | |
593 double max_value (double* data); | |
594 double sum_of_values (double* data); | |
595 double max_sum (double* data1, double* data2); | |
596 | |
597 double _last_pause_time_ms; | |
598 | |
599 size_t _bytes_in_collection_set_before_gc; | |
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600 size_t _bytes_copied_during_gc; |
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601 |
342 | 602 // Used to count used bytes in CS. |
603 friend class CountCSClosure; | |
604 | |
605 // Statistics kept per GC stoppage, pause or full. | |
606 TruncatedSeq* _recent_prev_end_times_for_all_gcs_sec; | |
607 | |
608 // Add a new GC of the given duration and end time to the record. | |
609 void update_recent_gc_times(double end_time_sec, double elapsed_ms); | |
610 | |
611 // The head of the list (via "next_in_collection_set()") representing the | |
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612 // current collection set. Set from the incrementally built collection |
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613 // set at the start of the pause. |
342 | 614 HeapRegion* _collection_set; |
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615 |
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616 // The number of bytes in the collection set before the pause. Set from |
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617 // the incrementally built collection set at the start of an evacuation |
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618 // pause. |
342 | 619 size_t _collection_set_bytes_used_before; |
620 | |
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621 // The associated information that is maintained while the incremental |
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622 // collection set is being built with young regions. Used to populate |
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623 // the recorded info for the evacuation pause. |
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624 |
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625 enum CSetBuildType { |
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626 Active, // We are actively building the collection set |
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627 Inactive // We are not actively building the collection set |
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628 }; |
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629 |
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630 CSetBuildType _inc_cset_build_state; |
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631 |
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632 // The head of the incrementally built collection set. |
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633 HeapRegion* _inc_cset_head; |
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634 |
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635 // The tail of the incrementally built collection set. |
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636 HeapRegion* _inc_cset_tail; |
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637 |
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638 // The number of bytes in the incrementally built collection set. |
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639 // Used to set _collection_set_bytes_used_before at the start of |
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640 // an evacuation pause. |
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641 size_t _inc_cset_bytes_used_before; |
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642 |
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643 // Used to record the highest end of heap region in collection set |
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644 HeapWord* _inc_cset_max_finger; |
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645 |
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646 // The RSet lengths recorded for regions in the CSet. It is updated |
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647 // by the thread that adds a new region to the CSet. We assume that |
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648 // only one thread can be allocating a new CSet region (currently, |
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649 // it does so after taking the Heap_lock) hence no need to |
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650 // synchronize updates to this field. |
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651 size_t _inc_cset_recorded_rs_lengths; |
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652 |
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653 // A concurrent refinement thread periodcially samples the young |
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654 // region RSets and needs to update _inc_cset_recorded_rs_lengths as |
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655 // the RSets grow. Instead of having to syncronize updates to that |
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656 // field we accumulate them in this field and add it to |
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657 // _inc_cset_recorded_rs_lengths_diffs at the start of a GC. |
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658 ssize_t _inc_cset_recorded_rs_lengths_diffs; |
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659 |
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660 // The predicted elapsed time it will take to collect the regions in |
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661 // the CSet. This is updated by the thread that adds a new region to |
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662 // the CSet. See the comment for _inc_cset_recorded_rs_lengths about |
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663 // MT-safety assumptions. |
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664 double _inc_cset_predicted_elapsed_time_ms; |
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665 |
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666 // See the comment for _inc_cset_recorded_rs_lengths_diffs. |
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667 double _inc_cset_predicted_elapsed_time_ms_diffs; |
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668 |
342 | 669 // Stash a pointer to the g1 heap. |
670 G1CollectedHeap* _g1; | |
671 | |
672 // The ratio of gc time to elapsed time, computed over recent pauses. | |
673 double _recent_avg_pause_time_ratio; | |
674 | |
675 double recent_avg_pause_time_ratio() { | |
676 return _recent_avg_pause_time_ratio; | |
677 } | |
678 | |
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679 // At the end of a pause we check the heap occupancy and we decide |
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680 // whether we will start a marking cycle during the next pause. If |
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681 // we decide that we want to do that, we will set this parameter to |
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682 // true. So, this parameter will stay true between the end of a |
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683 // pause and the beginning of a subsequent pause (not necessarily |
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684 // the next one, see the comments on the next field) when we decide |
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685 // that we will indeed start a marking cycle and do the initial-mark |
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686 // work. |
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687 volatile bool _initiate_conc_mark_if_possible; |
342 | 688 |
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689 // If initiate_conc_mark_if_possible() is set at the beginning of a |
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690 // pause, it is a suggestion that the pause should start a marking |
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691 // cycle by doing the initial-mark work. However, it is possible |
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692 // that the concurrent marking thread is still finishing up the |
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693 // previous marking cycle (e.g., clearing the next marking |
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694 // bitmap). If that is the case we cannot start a new cycle and |
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695 // we'll have to wait for the concurrent marking thread to finish |
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696 // what it is doing. In this case we will postpone the marking cycle |
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697 // initiation decision for the next pause. When we eventually decide |
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698 // to start a cycle, we will set _during_initial_mark_pause which |
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699 // will stay true until the end of the initial-mark pause and it's |
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700 // the condition that indicates that a pause is doing the |
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701 // initial-mark work. |
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702 volatile bool _during_initial_mark_pause; |
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703 |
4710 | 704 bool _last_young_gc; |
342 | 705 |
706 // This set of variables tracks the collector efficiency, in order to | |
707 // determine whether we should initiate a new marking. | |
708 double _cur_mark_stop_world_time_ms; | |
709 double _mark_remark_start_sec; | |
710 double _mark_cleanup_start_sec; | |
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711 double _root_region_scan_wait_time_ms; |
342 | 712 |
3919
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713 // Update the young list target length either by setting it to the |
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714 // desired fixed value or by calculating it using G1's pause |
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715 // prediction model. If no rs_lengths parameter is passed, predict |
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716 // the RS lengths using the prediction model, otherwise use the |
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717 // given rs_lengths as the prediction. |
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718 void update_young_list_target_length(size_t rs_lengths = (size_t) -1); |
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719 |
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720 // Calculate and return the minimum desired young list target |
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721 // length. This is the minimum desired young list length according |
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722 // to the user's inputs. |
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723 size_t calculate_young_list_desired_min_length(size_t base_min_length); |
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724 |
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725 // Calculate and return the maximum desired young list target |
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726 // length. This is the maximum desired young list length according |
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727 // to the user's inputs. |
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728 size_t calculate_young_list_desired_max_length(); |
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729 |
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730 // Calculate and return the maximum young list target length that |
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731 // can fit into the pause time goal. The parameters are: rs_lengths |
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732 // represent the prediction of how large the young RSet lengths will |
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733 // be, base_min_length is the alreay existing number of regions in |
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734 // the young list, min_length and max_length are the desired min and |
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735 // max young list length according to the user's inputs. |
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736 size_t calculate_young_list_target_length(size_t rs_lengths, |
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737 size_t base_min_length, |
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738 size_t desired_min_length, |
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739 size_t desired_max_length); |
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740 |
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741 // Check whether a given young length (young_length) fits into the |
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742 // given target pause time and whether the prediction for the amount |
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743 // of objects to be copied for the given length will fit into the |
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744 // given free space (expressed by base_free_regions). It is used by |
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745 // calculate_young_list_target_length(). |
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746 bool predict_will_fit(size_t young_length, double base_time_ms, |
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747 size_t base_free_regions, double target_pause_time_ms); |
342 | 748 |
4013 | 749 // Count the number of bytes used in the CS. |
750 void count_CS_bytes_used(); | |
751 | |
342 | 752 public: |
753 | |
754 G1CollectorPolicy(); | |
755 | |
756 virtual G1CollectorPolicy* as_g1_policy() { return this; } | |
757 | |
758 virtual CollectorPolicy::Name kind() { | |
759 return CollectorPolicy::G1CollectorPolicyKind; | |
760 } | |
761 | |
3919
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762 // Check the current value of the young list RSet lengths and |
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763 // compare it against the last prediction. If the current value is |
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764 // higher, recalculate the young list target length prediction. |
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765 void revise_young_list_target_length_if_necessary(); |
342 | 766 |
767 size_t bytes_in_collection_set() { | |
768 return _bytes_in_collection_set_before_gc; | |
769 } | |
770 | |
771 unsigned calc_gc_alloc_time_stamp() { | |
772 return _all_pause_times_ms->num() + 1; | |
773 } | |
774 | |
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775 // This should be called after the heap is resized. |
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776 void record_new_heap_size(size_t new_number_of_regions); |
3919
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777 |
4013 | 778 void init(); |
342 | 779 |
545 | 780 // Create jstat counters for the policy. |
781 virtual void initialize_gc_policy_counters(); | |
782 | |
342 | 783 virtual HeapWord* mem_allocate_work(size_t size, |
784 bool is_tlab, | |
785 bool* gc_overhead_limit_was_exceeded); | |
786 | |
787 // This method controls how a collector handles one or more | |
788 // of its generations being fully allocated. | |
789 virtual HeapWord* satisfy_failed_allocation(size_t size, | |
790 bool is_tlab); | |
791 | |
792 BarrierSet::Name barrier_set_name() { return BarrierSet::G1SATBCTLogging; } | |
793 | |
794 GenRemSet::Name rem_set_name() { return GenRemSet::CardTable; } | |
795 | |
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796 bool need_to_start_conc_mark(const char* source, size_t alloc_word_size = 0); |
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797 |
342 | 798 // Update the heuristic info to record a collection pause of the given |
799 // start time, where the given number of bytes were used at the start. | |
800 // This may involve changing the desired size of a collection set. | |
801 | |
4013 | 802 void record_stop_world_start(); |
342 | 803 |
4013 | 804 void record_collection_pause_start(double start_time_sec, size_t start_used); |
342 | 805 |
806 // Must currently be called while the world is stopped. | |
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807 void record_concurrent_mark_init_end(double |
342 | 808 mark_init_elapsed_time_ms); |
809 | |
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810 void record_root_region_scan_wait_time(double time_ms) { |
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811 _root_region_scan_wait_time_ms = time_ms; |
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812 } |
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813 |
4013 | 814 void record_concurrent_mark_remark_start(); |
815 void record_concurrent_mark_remark_end(); | |
342 | 816 |
4013 | 817 void record_concurrent_mark_cleanup_start(); |
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818 void record_concurrent_mark_cleanup_end(int no_of_gc_threads); |
4013 | 819 void record_concurrent_mark_cleanup_completed(); |
342 | 820 |
4013 | 821 void record_concurrent_pause(); |
822 void record_concurrent_pause_end(); | |
342 | 823 |
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824 void record_collection_pause_end(int no_of_gc_threads); |
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825 void print_heap_transition(); |
342 | 826 |
827 // Record the fact that a full collection occurred. | |
4013 | 828 void record_full_collection_start(); |
829 void record_full_collection_end(); | |
342 | 830 |
1611 | 831 void record_gc_worker_start_time(int worker_i, double ms) { |
832 _par_last_gc_worker_start_times_ms[worker_i] = ms; | |
833 } | |
834 | |
342 | 835 void record_ext_root_scan_time(int worker_i, double ms) { |
836 _par_last_ext_root_scan_times_ms[worker_i] = ms; | |
837 } | |
838 | |
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839 void record_satb_filtering_time(int worker_i, double ms) { |
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840 _par_last_satb_filtering_times_ms[worker_i] = ms; |
342 | 841 } |
842 | |
843 void record_update_rs_time(int thread, double ms) { | |
844 _par_last_update_rs_times_ms[thread] = ms; | |
845 } | |
846 | |
847 void record_update_rs_processed_buffers (int thread, | |
848 double processed_buffers) { | |
849 _par_last_update_rs_processed_buffers[thread] = processed_buffers; | |
850 } | |
851 | |
852 void record_scan_rs_time(int thread, double ms) { | |
853 _par_last_scan_rs_times_ms[thread] = ms; | |
854 } | |
855 | |
856 void reset_obj_copy_time(int thread) { | |
857 _par_last_obj_copy_times_ms[thread] = 0.0; | |
858 } | |
859 | |
860 void reset_obj_copy_time() { | |
861 reset_obj_copy_time(0); | |
862 } | |
863 | |
864 void record_obj_copy_time(int thread, double ms) { | |
865 _par_last_obj_copy_times_ms[thread] += ms; | |
866 } | |
867 | |
1611 | 868 void record_termination(int thread, double ms, size_t attempts) { |
869 _par_last_termination_times_ms[thread] = ms; | |
870 _par_last_termination_attempts[thread] = (double) attempts; | |
342 | 871 } |
872 | |
1611 | 873 void record_gc_worker_end_time(int worker_i, double ms) { |
874 _par_last_gc_worker_end_times_ms[worker_i] = ms; | |
342 | 875 } |
876 | |
595
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877 void record_pause_time_ms(double ms) { |
342 | 878 _last_pause_time_ms = ms; |
879 } | |
880 | |
881 void record_clear_ct_time(double ms) { | |
882 _cur_clear_ct_time_ms = ms; | |
883 } | |
884 | |
885 void record_par_time(double ms) { | |
886 _cur_collection_par_time_ms = ms; | |
887 } | |
888 | |
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889 void record_code_root_fixup_time(double ms) { |
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890 _cur_collection_code_root_fixup_time_ms = ms; |
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891 } |
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|
892 |
342 | 893 void record_aux_start_time(int i) { |
894 guarantee(i < _aux_num, "should be within range"); | |
895 _cur_aux_start_times_ms[i] = os::elapsedTime() * 1000.0; | |
896 } | |
897 | |
898 void record_aux_end_time(int i) { | |
899 guarantee(i < _aux_num, "should be within range"); | |
900 double ms = os::elapsedTime() * 1000.0 - _cur_aux_start_times_ms[i]; | |
901 _cur_aux_times_set[i] = true; | |
902 _cur_aux_times_ms[i] += ms; | |
903 } | |
904 | |
3979
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|
905 void record_ref_proc_time(double ms) { |
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|
906 _cur_ref_proc_time_ms = ms; |
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|
907 } |
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|
908 |
4dfb2df418f2
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|
909 void record_ref_enq_time(double ms) { |
4dfb2df418f2
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|
910 _cur_ref_enq_time_ms = ms; |
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|
911 } |
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|
912 |
890
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6819077: G1: first GC thread coming late into the GC.
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|
913 #ifndef PRODUCT |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
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|
914 void record_cc_clear_time(double ms) { |
6cb8e9df7174
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|
915 if (_min_clear_cc_time_ms < 0.0 || ms <= _min_clear_cc_time_ms) |
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|
916 _min_clear_cc_time_ms = ms; |
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|
917 if (_max_clear_cc_time_ms < 0.0 || ms >= _max_clear_cc_time_ms) |
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|
918 _max_clear_cc_time_ms = ms; |
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|
919 _cur_clear_cc_time_ms = ms; |
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|
920 _cum_clear_cc_time_ms += ms; |
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diff
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|
921 _num_cc_clears++; |
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diff
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|
922 } |
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6819077: G1: first GC thread coming late into the GC.
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diff
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|
923 #endif |
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diff
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|
924 |
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f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
925 // Record how much space we copied during a GC. This is typically |
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|
926 // called when a GC alloc region is being retired. |
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|
927 void record_bytes_copied_during_gc(size_t bytes) { |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
928 _bytes_copied_during_gc += bytes; |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
929 } |
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|
930 |
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|
931 // The amount of space we copied during a GC. |
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932 size_t bytes_copied_during_gc() { |
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|
933 return _bytes_copied_during_gc; |
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|
934 } |
342 | 935 |
5972
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|
936 // Determine whether there are candidate regions so that the |
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937 // next GC should be mixed. The two action strings are used |
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938 // in the ergo output when the method returns true or false. |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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|
939 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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|
940 const char* false_action_str); |
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|
941 |
342 | 942 // Choose a new collection set. Marks the chosen regions as being |
943 // "in_collection_set", and links them together. The head and number of | |
944 // the collection set are available via access methods. | |
4912
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|
945 void finalize_cset(double target_pause_time_ms); |
342 | 946 |
947 // The head of the list (via "next_in_collection_set()") representing the | |
948 // current collection set. | |
949 HeapRegion* collection_set() { return _collection_set; } | |
950 | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
951 void clear_collection_set() { _collection_set = NULL; } |
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|
952 |
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
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|
953 // Add old region "hr" to the CSet. |
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|
954 void add_old_region_to_cset(HeapRegion* hr); |
342 | 955 |
1394
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|
956 // Incremental CSet Support |
1316cec51b4d
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|
957 |
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|
958 // The head of the incrementally built collection set. |
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959 HeapRegion* inc_cset_head() { return _inc_cset_head; } |
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|
960 |
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|
961 // The tail of the incrementally built collection set. |
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|
962 HeapRegion* inc_set_tail() { return _inc_cset_tail; } |
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|
963 |
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|
964 // Initialize incremental collection set info. |
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|
965 void start_incremental_cset_building(); |
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diff
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|
966 |
4727
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|
967 // Perform any final calculations on the incremental CSet fields |
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968 // before we can use them. |
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969 void finalize_incremental_cset_building(); |
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|
970 |
1394
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|
971 void clear_incremental_cset() { |
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972 _inc_cset_head = NULL; |
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973 _inc_cset_tail = NULL; |
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974 } |
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975 |
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976 // Stop adding regions to the incremental collection set |
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977 void stop_incremental_cset_building() { _inc_cset_build_state = Inactive; } |
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978 |
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979 // Add information about hr to the aggregated information for the |
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980 // incrementally built collection set. |
1394
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981 void add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length); |
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982 |
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983 // Update information about hr in the aggregated information for |
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984 // the incrementally built collection set. |
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985 void update_incremental_cset_info(HeapRegion* hr, size_t new_rs_length); |
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986 |
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987 private: |
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988 // Update the incremental cset information when adding a region |
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989 // (should not be called directly). |
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990 void add_region_to_incremental_cset_common(HeapRegion* hr); |
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991 |
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992 public: |
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993 // Add hr to the LHS of the incremental collection set. |
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994 void add_region_to_incremental_cset_lhs(HeapRegion* hr); |
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995 |
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996 // Add hr to the RHS of the incremental collection set. |
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997 void add_region_to_incremental_cset_rhs(HeapRegion* hr); |
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998 |
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999 #ifndef PRODUCT |
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1000 void print_collection_set(HeapRegion* list_head, outputStream* st); |
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1001 #endif // !PRODUCT |
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1002 |
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1003 bool initiate_conc_mark_if_possible() { return _initiate_conc_mark_if_possible; } |
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1004 void set_initiate_conc_mark_if_possible() { _initiate_conc_mark_if_possible = true; } |
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1005 void clear_initiate_conc_mark_if_possible() { _initiate_conc_mark_if_possible = false; } |
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1006 |
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1007 bool during_initial_mark_pause() { return _during_initial_mark_pause; } |
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1008 void set_during_initial_mark_pause() { _during_initial_mark_pause = true; } |
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1009 void clear_during_initial_mark_pause(){ _during_initial_mark_pause = false; } |
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1010 |
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1011 // This sets the initiate_conc_mark_if_possible() flag to start a |
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1012 // new cycle, as long as we are not already in one. It's best if it |
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1013 // is called during a safepoint when the test whether a cycle is in |
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1014 // progress or not is stable. |
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1015 bool force_initial_mark_if_outside_cycle(GCCause::Cause gc_cause); |
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1016 |
1359
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1017 // This is called at the very beginning of an evacuation pause (it |
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1018 // has to be the first thing that the pause does). If |
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1019 // initiate_conc_mark_if_possible() is true, and the concurrent |
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1020 // marking thread has completed its work during the previous cycle, |
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1021 // it will set during_initial_mark_pause() to so that the pause does |
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1022 // the initial-mark work and start a marking cycle. |
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1023 void decide_on_conc_mark_initiation(); |
342 | 1024 |
1025 // If an expansion would be appropriate, because recent GC overhead had | |
1026 // exceeded the desired limit, return an amount to expand by. | |
4013 | 1027 size_t expansion_amount(); |
342 | 1028 |
1029 #ifndef PRODUCT | |
1030 // Check any appropriate marked bytes info, asserting false if | |
1031 // something's wrong, else returning "true". | |
4013 | 1032 bool assertMarkedBytesDataOK(); |
342 | 1033 #endif |
1034 | |
1035 // Print tracing information. | |
1036 void print_tracing_info() const; | |
1037 | |
1038 // Print stats on young survival ratio | |
1039 void print_yg_surv_rate_info() const; | |
1040 | |
545 | 1041 void finished_recalculating_age_indexes(bool is_survivors) { |
1042 if (is_survivors) { | |
1043 _survivor_surv_rate_group->finished_recalculating_age_indexes(); | |
1044 } else { | |
1045 _short_lived_surv_rate_group->finished_recalculating_age_indexes(); | |
1046 } | |
342 | 1047 // do that for any other surv rate groups |
1048 } | |
1049 | |
1973 | 1050 bool is_young_list_full() { |
1051 size_t young_list_length = _g1->young_list()->length(); | |
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1052 size_t young_list_target_length = _young_list_target_length; |
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1053 return young_list_length >= young_list_target_length; |
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1054 } |
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1055 |
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1056 bool can_expand_young_list() { |
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1057 size_t young_list_length = _g1->young_list()->length(); |
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1058 size_t young_list_max_length = _young_list_max_length; |
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1059 return young_list_length < young_list_max_length; |
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1060 } |
1973 | 1061 |
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1062 size_t young_list_max_length() { |
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1063 return _young_list_max_length; |
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1064 } |
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1065 |
4710 | 1066 bool gcs_are_young() { |
1067 return _gcs_are_young; | |
342 | 1068 } |
4710 | 1069 void set_gcs_are_young(bool gcs_are_young) { |
1070 _gcs_are_young = gcs_are_young; | |
342 | 1071 } |
1072 | |
1073 bool adaptive_young_list_length() { | |
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1074 return _young_gen_sizer->adaptive_young_list_length(); |
342 | 1075 } |
1076 | |
1077 inline double get_gc_eff_factor() { | |
1078 double ratio = _known_garbage_ratio; | |
1079 | |
1080 double square = ratio * ratio; | |
1081 // square = square * square; | |
1082 double ret = square * 9.0 + 1.0; | |
1083 #if 0 | |
1084 gclog_or_tty->print_cr("ratio = %1.2lf, ret = %1.2lf", ratio, ret); | |
1085 #endif // 0 | |
1086 guarantee(0.0 <= ret && ret < 10.0, "invariant!"); | |
1087 return ret; | |
1088 } | |
1089 | |
4013 | 1090 private: |
342 | 1091 // |
1092 // Survivor regions policy. | |
1093 // | |
1094 | |
1095 // Current tenuring threshold, set to 0 if the collector reaches the | |
1096 // maximum amount of suvivors regions. | |
1097 int _tenuring_threshold; | |
1098 | |
545 | 1099 // The limit on the number of regions allocated for survivors. |
1100 size_t _max_survivor_regions; | |
1101 | |
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1102 // For reporting purposes. |
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1103 size_t _eden_bytes_before_gc; |
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1104 size_t _survivor_bytes_before_gc; |
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1105 size_t _capacity_before_gc; |
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1106 |
545 | 1107 // The amount of survor regions after a collection. |
1108 size_t _recorded_survivor_regions; | |
1109 // List of survivor regions. | |
1110 HeapRegion* _recorded_survivor_head; | |
1111 HeapRegion* _recorded_survivor_tail; | |
1112 | |
1113 ageTable _survivors_age_table; | |
1114 | |
342 | 1115 public: |
1116 | |
1117 inline GCAllocPurpose | |
1118 evacuation_destination(HeapRegion* src_region, int age, size_t word_sz) { | |
1119 if (age < _tenuring_threshold && src_region->is_young()) { | |
1120 return GCAllocForSurvived; | |
1121 } else { | |
1122 return GCAllocForTenured; | |
1123 } | |
1124 } | |
1125 | |
1126 inline bool track_object_age(GCAllocPurpose purpose) { | |
1127 return purpose == GCAllocForSurvived; | |
1128 } | |
1129 | |
545 | 1130 static const size_t REGIONS_UNLIMITED = ~(size_t)0; |
1131 | |
1132 size_t max_regions(int purpose); | |
342 | 1133 |
1134 // The limit on regions for a particular purpose is reached. | |
1135 void note_alloc_region_limit_reached(int purpose) { | |
1136 if (purpose == GCAllocForSurvived) { | |
1137 _tenuring_threshold = 0; | |
1138 } | |
1139 } | |
1140 | |
1141 void note_start_adding_survivor_regions() { | |
1142 _survivor_surv_rate_group->start_adding_regions(); | |
1143 } | |
1144 | |
1145 void note_stop_adding_survivor_regions() { | |
1146 _survivor_surv_rate_group->stop_adding_regions(); | |
1147 } | |
545 | 1148 |
1149 void record_survivor_regions(size_t regions, | |
1150 HeapRegion* head, | |
1151 HeapRegion* tail) { | |
1152 _recorded_survivor_regions = regions; | |
1153 _recorded_survivor_head = head; | |
1154 _recorded_survivor_tail = tail; | |
1155 } | |
1156 | |
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1157 size_t recorded_survivor_regions() { |
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1158 return _recorded_survivor_regions; |
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1159 } |
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1160 |
545 | 1161 void record_thread_age_table(ageTable* age_table) |
1162 { | |
1163 _survivors_age_table.merge_par(age_table); | |
1164 } | |
1165 | |
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1166 void update_max_gc_locker_expansion(); |
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1167 |
545 | 1168 // Calculates survivor space parameters. |
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1169 void update_survivors_policy(); |
545 | 1170 |
342 | 1171 }; |
1172 | |
1173 // This should move to some place more general... | |
1174 | |
1175 // If we have "n" measurements, and we've kept track of their "sum" and the | |
1176 // "sum_of_squares" of the measurements, this returns the variance of the | |
1177 // sequence. | |
1178 inline double variance(int n, double sum_of_squares, double sum) { | |
1179 double n_d = (double)n; | |
1180 double avg = sum/n_d; | |
1181 return (sum_of_squares - 2.0 * avg * sum + n_d * avg * avg) / n_d; | |
1182 } | |
1183 | |
1972 | 1184 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTORPOLICY_HPP |