Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.hpp @ 5986:500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
Summary: Tiered compilation has increased the number of nmethods in the code cache. This has, in turn, significantly increased the number of marked nmethods processed during the StrongRootsScope destructor. Create a specialized version of CodeBlobToOopClosure for G1 which places only those nmethods that contain pointers into the collection set on to the marked nmethods list.
Reviewed-by: iveresov, tonyp
author | johnc |
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date | Tue, 13 Mar 2012 11:05:32 -0700 |
parents | 9a9bb0010c91 |
children | 2a0172480595 |
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 { |
342 | 67 define_num_seq(satb_drain) // optional |
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68 define_num_seq(root_region_scan_wait) |
342 | 69 define_num_seq(parallel) // parallel only |
70 define_num_seq(ext_root_scan) | |
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71 define_num_seq(satb_filtering) |
342 | 72 define_num_seq(update_rs) |
73 define_num_seq(scan_rs) | |
74 define_num_seq(obj_copy) | |
75 define_num_seq(termination) // parallel only | |
76 define_num_seq(parallel_other) // parallel only | |
77 define_num_seq(mark_closure) | |
4023 | 78 define_num_seq(clear_ct) |
342 | 79 }; |
80 | |
677 | 81 class Summary: public PauseSummary, |
82 public MainBodySummary { | |
342 | 83 public: |
84 virtual MainBodySummary* main_body_summary() { return this; } | |
85 }; | |
86 | |
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87 // There are three command line options related to the young gen size: |
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88 // NewSize, MaxNewSize and NewRatio (There is also -Xmn, but that is |
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89 // just a short form for NewSize==MaxNewSize). G1 will use its internal |
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90 // heuristics to calculate the actual young gen size, so these options |
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91 // basically only limit the range within which G1 can pick a young gen |
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92 // size. Also, these are general options taking byte sizes. G1 will |
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93 // internally work with a number of regions instead. So, some rounding |
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94 // will occur. |
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95 // |
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96 // If nothing related to the the young gen size is set on the command |
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97 // line we should allow the young gen to be between |
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98 // G1DefaultMinNewGenPercent and G1DefaultMaxNewGenPercent of the |
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99 // heap size. This means that every time the heap size changes the |
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100 // limits for the young gen size will be updated. |
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101 // |
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102 // If only -XX:NewSize is set we should use the specified value as the |
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103 // minimum size for young gen. Still using G1DefaultMaxNewGenPercent |
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104 // of the heap as maximum. |
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105 // |
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106 // If only -XX:MaxNewSize is set we should use the specified value as the |
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107 // maximum size for young gen. Still using G1DefaultMinNewGenPercent |
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108 // of the heap as minimum. |
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109 // |
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110 // If -XX:NewSize and -XX:MaxNewSize are both specified we use these values. |
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111 // No updates when the heap size changes. There is a special case when |
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112 // NewSize==MaxNewSize. This is interpreted as "fixed" and will use a |
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113 // different heuristic for calculating the collection set when we do mixed |
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114 // collection. |
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115 // |
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116 // If only -XX:NewRatio is set we should use the specified ratio of the heap |
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117 // as both min and max. This will be interpreted as "fixed" just like the |
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118 // NewSize==MaxNewSize case above. But we will update the min and max |
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119 // everytime the heap size changes. |
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120 // |
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121 // NewSize and MaxNewSize override NewRatio. So, NewRatio is ignored if it is |
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122 // combined with either NewSize or MaxNewSize. (A warning message is printed.) |
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123 class G1YoungGenSizer : public CHeapObj { |
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124 private: |
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125 enum SizerKind { |
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126 SizerDefaults, |
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127 SizerNewSizeOnly, |
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128 SizerMaxNewSizeOnly, |
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129 SizerMaxAndNewSize, |
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130 SizerNewRatio |
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131 }; |
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132 SizerKind _sizer_kind; |
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133 size_t _min_desired_young_length; |
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134 size_t _max_desired_young_length; |
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135 bool _adaptive_size; |
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136 size_t calculate_default_min_length(size_t new_number_of_heap_regions); |
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137 size_t calculate_default_max_length(size_t new_number_of_heap_regions); |
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138 |
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139 public: |
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140 G1YoungGenSizer(); |
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141 void heap_size_changed(size_t new_number_of_heap_regions); |
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142 size_t min_desired_young_length() { |
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143 return _min_desired_young_length; |
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144 } |
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145 size_t max_desired_young_length() { |
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146 return _max_desired_young_length; |
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147 } |
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148 bool adaptive_young_list_length() { |
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149 return _adaptive_size; |
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150 } |
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151 }; |
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152 |
342 | 153 class G1CollectorPolicy: public CollectorPolicy { |
4013 | 154 private: |
342 | 155 // either equal to the number of parallel threads, if ParallelGCThreads |
156 // has been set, or 1 otherwise | |
157 int _parallel_gc_threads; | |
158 | |
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159 // The number of GC threads currently active. |
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160 uintx _no_of_gc_threads; |
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161 |
342 | 162 enum SomePrivateConstants { |
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163 NumPrevPausesForHeuristics = 10 |
342 | 164 }; |
165 | |
166 G1MMUTracker* _mmu_tracker; | |
167 | |
168 void initialize_flags(); | |
169 | |
170 void initialize_all() { | |
171 initialize_flags(); | |
172 initialize_size_info(); | |
173 initialize_perm_generation(PermGen::MarkSweepCompact); | |
174 } | |
175 | |
4013 | 176 CollectionSetChooser* _collectionSetChooser; |
342 | 177 |
178 double _cur_collection_start_sec; | |
179 size_t _cur_collection_pause_used_at_start_bytes; | |
180 size_t _cur_collection_pause_used_regions_at_start; | |
181 double _cur_collection_par_time_ms; | |
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182 |
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183 double _cur_collection_code_root_fixup_time_ms; |
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184 |
342 | 185 double _cur_satb_drain_time_ms; |
186 double _cur_clear_ct_time_ms; | |
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187 double _cur_ref_proc_time_ms; |
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188 double _cur_ref_enq_time_ms; |
342 | 189 |
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190 #ifndef PRODUCT |
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191 // Card Table Count Cache stats |
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192 double _min_clear_cc_time_ms; // min |
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193 double _max_clear_cc_time_ms; // max |
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194 double _cur_clear_cc_time_ms; // clearing time during current pause |
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195 double _cum_clear_cc_time_ms; // cummulative clearing time |
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196 jlong _num_cc_clears; // number of times the card count cache has been cleared |
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197 #endif |
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198 |
342 | 199 // These exclude marking times. |
200 TruncatedSeq* _recent_gc_times_ms; | |
201 | |
202 TruncatedSeq* _concurrent_mark_remark_times_ms; | |
203 TruncatedSeq* _concurrent_mark_cleanup_times_ms; | |
204 | |
677 | 205 Summary* _summary; |
342 | 206 |
207 NumberSeq* _all_pause_times_ms; | |
208 NumberSeq* _all_full_gc_times_ms; | |
209 double _stop_world_start; | |
210 NumberSeq* _all_stop_world_times_ms; | |
211 NumberSeq* _all_yield_times_ms; | |
212 | |
213 int _aux_num; | |
214 NumberSeq* _all_aux_times_ms; | |
215 double* _cur_aux_start_times_ms; | |
216 double* _cur_aux_times_ms; | |
217 bool* _cur_aux_times_set; | |
218 | |
1611 | 219 double* _par_last_gc_worker_start_times_ms; |
342 | 220 double* _par_last_ext_root_scan_times_ms; |
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221 double* _par_last_satb_filtering_times_ms; |
342 | 222 double* _par_last_update_rs_times_ms; |
223 double* _par_last_update_rs_processed_buffers; | |
224 double* _par_last_scan_rs_times_ms; | |
225 double* _par_last_obj_copy_times_ms; | |
226 double* _par_last_termination_times_ms; | |
1611 | 227 double* _par_last_termination_attempts; |
228 double* _par_last_gc_worker_end_times_ms; | |
2430 | 229 double* _par_last_gc_worker_times_ms; |
342 | 230 |
4023 | 231 // Each workers 'other' time i.e. the elapsed time of the parallel |
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232 // code executed by a worker minus the sum of the individual sub-phase |
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233 // times for that worker thread. |
4023 | 234 double* _par_last_gc_worker_other_times_ms; |
235 | |
4710 | 236 // indicates whether we are in young or mixed GC mode |
237 bool _gcs_are_young; | |
342 | 238 |
239 size_t _young_list_target_length; | |
240 size_t _young_list_fixed_length; | |
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241 size_t _prev_eden_capacity; // used for logging |
342 | 242 |
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243 // The max number of regions we can extend the eden by while the GC |
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244 // locker is active. This should be >= _young_list_target_length; |
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245 size_t _young_list_max_length; |
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246 |
4710 | 247 bool _last_gc_was_young; |
342 | 248 |
4710 | 249 unsigned _young_pause_num; |
250 unsigned _mixed_pause_num; | |
342 | 251 |
252 bool _during_marking; | |
253 bool _in_marking_window; | |
254 bool _in_marking_window_im; | |
255 | |
256 SurvRateGroup* _short_lived_surv_rate_group; | |
257 SurvRateGroup* _survivor_surv_rate_group; | |
258 // add here any more surv rate groups | |
259 | |
1356 | 260 double _gc_overhead_perc; |
261 | |
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262 double _reserve_factor; |
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263 size_t _reserve_regions; |
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264 |
342 | 265 bool during_marking() { |
266 return _during_marking; | |
267 } | |
268 | |
269 private: | |
270 enum PredictionConstants { | |
271 TruncatedSeqLength = 10 | |
272 }; | |
273 | |
274 TruncatedSeq* _alloc_rate_ms_seq; | |
275 double _prev_collection_pause_end_ms; | |
276 | |
277 TruncatedSeq* _pending_card_diff_seq; | |
278 TruncatedSeq* _rs_length_diff_seq; | |
279 TruncatedSeq* _cost_per_card_ms_seq; | |
4710 | 280 TruncatedSeq* _young_cards_per_entry_ratio_seq; |
281 TruncatedSeq* _mixed_cards_per_entry_ratio_seq; | |
342 | 282 TruncatedSeq* _cost_per_entry_ms_seq; |
4710 | 283 TruncatedSeq* _mixed_cost_per_entry_ms_seq; |
342 | 284 TruncatedSeq* _cost_per_byte_ms_seq; |
285 TruncatedSeq* _constant_other_time_ms_seq; | |
286 TruncatedSeq* _young_other_cost_per_region_ms_seq; | |
287 TruncatedSeq* _non_young_other_cost_per_region_ms_seq; | |
288 | |
289 TruncatedSeq* _pending_cards_seq; | |
290 TruncatedSeq* _rs_lengths_seq; | |
291 | |
292 TruncatedSeq* _cost_per_byte_ms_during_cm_seq; | |
293 | |
294 TruncatedSeq* _young_gc_eff_seq; | |
295 | |
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296 G1YoungGenSizer* _young_gen_sizer; |
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297 |
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298 size_t _eden_cset_region_length; |
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299 size_t _survivor_cset_region_length; |
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300 size_t _old_cset_region_length; |
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301 |
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302 void init_cset_region_lengths(size_t eden_cset_region_length, |
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303 size_t survivor_cset_region_length); |
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304 |
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305 size_t eden_cset_region_length() { return _eden_cset_region_length; } |
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306 size_t survivor_cset_region_length() { return _survivor_cset_region_length; } |
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307 size_t old_cset_region_length() { return _old_cset_region_length; } |
342 | 308 |
309 size_t _free_regions_at_end_of_collection; | |
310 | |
311 size_t _recorded_rs_lengths; | |
312 size_t _max_rs_lengths; | |
313 | |
314 double _recorded_young_free_cset_time_ms; | |
315 double _recorded_non_young_free_cset_time_ms; | |
316 | |
317 double _sigma; | |
318 | |
319 size_t _rs_lengths_prediction; | |
320 | |
321 size_t _known_garbage_bytes; | |
322 double _known_garbage_ratio; | |
323 | |
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324 double sigma() { return _sigma; } |
342 | 325 |
326 // A function that prevents us putting too much stock in small sample | |
327 // sets. Returns a number between 2.0 and 1.0, depending on the number | |
328 // of samples. 5 or more samples yields one; fewer scales linearly from | |
329 // 2.0 at 1 sample to 1.0 at 5. | |
330 double confidence_factor(int samples) { | |
331 if (samples > 4) return 1.0; | |
332 else return 1.0 + sigma() * ((double)(5 - samples))/2.0; | |
333 } | |
334 | |
335 double get_new_neg_prediction(TruncatedSeq* seq) { | |
336 return seq->davg() - sigma() * seq->dsd(); | |
337 } | |
338 | |
339 #ifndef PRODUCT | |
340 bool verify_young_ages(HeapRegion* head, SurvRateGroup *surv_rate_group); | |
341 #endif // PRODUCT | |
342 | |
1111 | 343 void adjust_concurrent_refinement(double update_rs_time, |
344 double update_rs_processed_buffers, | |
345 double goal_ms); | |
346 | |
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347 uintx no_of_gc_threads() { return _no_of_gc_threads; } |
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348 void set_no_of_gc_threads(uintx v) { _no_of_gc_threads = v; } |
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349 |
342 | 350 double _pause_time_target_ms; |
351 double _recorded_young_cset_choice_time_ms; | |
352 double _recorded_non_young_cset_choice_time_ms; | |
353 size_t _pending_cards; | |
354 size_t _max_pending_cards; | |
355 | |
356 public: | |
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357 // Accessors |
342 | 358 |
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359 void set_region_eden(HeapRegion* hr, int young_index_in_cset) { |
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360 hr->set_young(); |
342 | 361 hr->install_surv_rate_group(_short_lived_surv_rate_group); |
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362 hr->set_young_index_in_cset(young_index_in_cset); |
342 | 363 } |
364 | |
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365 void set_region_survivor(HeapRegion* hr, int young_index_in_cset) { |
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366 assert(hr->is_young() && hr->is_survivor(), "pre-condition"); |
342 | 367 hr->install_surv_rate_group(_survivor_surv_rate_group); |
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368 hr->set_young_index_in_cset(young_index_in_cset); |
342 | 369 } |
370 | |
371 #ifndef PRODUCT | |
372 bool verify_young_ages(); | |
373 #endif // PRODUCT | |
374 | |
375 double get_new_prediction(TruncatedSeq* seq) { | |
376 return MAX2(seq->davg() + sigma() * seq->dsd(), | |
377 seq->davg() * confidence_factor(seq->num())); | |
378 } | |
379 | |
380 void record_max_rs_lengths(size_t rs_lengths) { | |
381 _max_rs_lengths = rs_lengths; | |
382 } | |
383 | |
384 size_t predict_pending_card_diff() { | |
385 double prediction = get_new_neg_prediction(_pending_card_diff_seq); | |
4710 | 386 if (prediction < 0.00001) { |
342 | 387 return 0; |
4710 | 388 } else { |
342 | 389 return (size_t) prediction; |
4710 | 390 } |
342 | 391 } |
392 | |
393 size_t predict_pending_cards() { | |
394 size_t max_pending_card_num = _g1->max_pending_card_num(); | |
395 size_t diff = predict_pending_card_diff(); | |
396 size_t prediction; | |
4710 | 397 if (diff > max_pending_card_num) { |
342 | 398 prediction = max_pending_card_num; |
4710 | 399 } else { |
342 | 400 prediction = max_pending_card_num - diff; |
4710 | 401 } |
342 | 402 |
403 return prediction; | |
404 } | |
405 | |
406 size_t predict_rs_length_diff() { | |
407 return (size_t) get_new_prediction(_rs_length_diff_seq); | |
408 } | |
409 | |
410 double predict_alloc_rate_ms() { | |
411 return get_new_prediction(_alloc_rate_ms_seq); | |
412 } | |
413 | |
414 double predict_cost_per_card_ms() { | |
415 return get_new_prediction(_cost_per_card_ms_seq); | |
416 } | |
417 | |
418 double predict_rs_update_time_ms(size_t pending_cards) { | |
419 return (double) pending_cards * predict_cost_per_card_ms(); | |
420 } | |
421 | |
4710 | 422 double predict_young_cards_per_entry_ratio() { |
423 return get_new_prediction(_young_cards_per_entry_ratio_seq); | |
342 | 424 } |
425 | |
4710 | 426 double predict_mixed_cards_per_entry_ratio() { |
427 if (_mixed_cards_per_entry_ratio_seq->num() < 2) { | |
428 return predict_young_cards_per_entry_ratio(); | |
429 } else { | |
430 return get_new_prediction(_mixed_cards_per_entry_ratio_seq); | |
431 } | |
342 | 432 } |
433 | |
434 size_t predict_young_card_num(size_t rs_length) { | |
435 return (size_t) ((double) rs_length * | |
4710 | 436 predict_young_cards_per_entry_ratio()); |
342 | 437 } |
438 | |
439 size_t predict_non_young_card_num(size_t rs_length) { | |
440 return (size_t) ((double) rs_length * | |
4710 | 441 predict_mixed_cards_per_entry_ratio()); |
342 | 442 } |
443 | |
444 double predict_rs_scan_time_ms(size_t card_num) { | |
4710 | 445 if (gcs_are_young()) { |
342 | 446 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); |
4710 | 447 } else { |
448 return predict_mixed_rs_scan_time_ms(card_num); | |
449 } | |
342 | 450 } |
451 | |
4710 | 452 double predict_mixed_rs_scan_time_ms(size_t card_num) { |
453 if (_mixed_cost_per_entry_ms_seq->num() < 3) { | |
342 | 454 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); |
4710 | 455 } else { |
456 return (double) (card_num * | |
457 get_new_prediction(_mixed_cost_per_entry_ms_seq)); | |
458 } | |
342 | 459 } |
460 | |
461 double predict_object_copy_time_ms_during_cm(size_t bytes_to_copy) { | |
4710 | 462 if (_cost_per_byte_ms_during_cm_seq->num() < 3) { |
463 return (1.1 * (double) bytes_to_copy) * | |
464 get_new_prediction(_cost_per_byte_ms_seq); | |
465 } else { | |
342 | 466 return (double) bytes_to_copy * |
4710 | 467 get_new_prediction(_cost_per_byte_ms_during_cm_seq); |
468 } | |
342 | 469 } |
470 | |
471 double predict_object_copy_time_ms(size_t bytes_to_copy) { | |
4710 | 472 if (_in_marking_window && !_in_marking_window_im) { |
342 | 473 return predict_object_copy_time_ms_during_cm(bytes_to_copy); |
4710 | 474 } else { |
342 | 475 return (double) bytes_to_copy * |
4710 | 476 get_new_prediction(_cost_per_byte_ms_seq); |
477 } | |
342 | 478 } |
479 | |
480 double predict_constant_other_time_ms() { | |
481 return get_new_prediction(_constant_other_time_ms_seq); | |
482 } | |
483 | |
484 double predict_young_other_time_ms(size_t young_num) { | |
4710 | 485 return (double) young_num * |
486 get_new_prediction(_young_other_cost_per_region_ms_seq); | |
342 | 487 } |
488 | |
489 double predict_non_young_other_time_ms(size_t non_young_num) { | |
4710 | 490 return (double) non_young_num * |
491 get_new_prediction(_non_young_other_cost_per_region_ms_seq); | |
342 | 492 } |
493 | |
494 double predict_young_collection_elapsed_time_ms(size_t adjustment); | |
495 double predict_base_elapsed_time_ms(size_t pending_cards); | |
496 double predict_base_elapsed_time_ms(size_t pending_cards, | |
497 size_t scanned_cards); | |
498 size_t predict_bytes_to_copy(HeapRegion* hr); | |
499 double predict_region_elapsed_time_ms(HeapRegion* hr, bool young); | |
500 | |
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501 void set_recorded_rs_lengths(size_t rs_lengths); |
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502 |
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503 size_t cset_region_length() { return young_cset_region_length() + |
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504 old_cset_region_length(); } |
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505 size_t young_cset_region_length() { return eden_cset_region_length() + |
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506 survivor_cset_region_length(); } |
342 | 507 |
508 void record_young_free_cset_time_ms(double time_ms) { | |
509 _recorded_young_free_cset_time_ms = time_ms; | |
510 } | |
511 | |
512 void record_non_young_free_cset_time_ms(double time_ms) { | |
513 _recorded_non_young_free_cset_time_ms = time_ms; | |
514 } | |
515 | |
516 double predict_young_gc_eff() { | |
517 return get_new_neg_prediction(_young_gc_eff_seq); | |
518 } | |
519 | |
545 | 520 double predict_survivor_regions_evac_time(); |
521 | |
342 | 522 void cset_regions_freed() { |
4710 | 523 bool propagate = _last_gc_was_young && !_in_marking_window; |
342 | 524 _short_lived_surv_rate_group->all_surviving_words_recorded(propagate); |
525 _survivor_surv_rate_group->all_surviving_words_recorded(propagate); | |
526 // also call it on any more surv rate groups | |
527 } | |
528 | |
529 void set_known_garbage_bytes(size_t known_garbage_bytes) { | |
530 _known_garbage_bytes = known_garbage_bytes; | |
531 size_t heap_bytes = _g1->capacity(); | |
532 _known_garbage_ratio = (double) _known_garbage_bytes / (double) heap_bytes; | |
533 } | |
534 | |
535 void decrease_known_garbage_bytes(size_t known_garbage_bytes) { | |
536 guarantee( _known_garbage_bytes >= known_garbage_bytes, "invariant" ); | |
537 | |
538 _known_garbage_bytes -= known_garbage_bytes; | |
539 size_t heap_bytes = _g1->capacity(); | |
540 _known_garbage_ratio = (double) _known_garbage_bytes / (double) heap_bytes; | |
541 } | |
542 | |
543 G1MMUTracker* mmu_tracker() { | |
544 return _mmu_tracker; | |
545 } | |
546 | |
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547 double max_pause_time_ms() { |
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548 return _mmu_tracker->max_gc_time() * 1000.0; |
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549 } |
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550 |
342 | 551 double predict_remark_time_ms() { |
552 return get_new_prediction(_concurrent_mark_remark_times_ms); | |
553 } | |
554 | |
555 double predict_cleanup_time_ms() { | |
556 return get_new_prediction(_concurrent_mark_cleanup_times_ms); | |
557 } | |
558 | |
559 // Returns an estimate of the survival rate of the region at yg-age | |
560 // "yg_age". | |
545 | 561 double predict_yg_surv_rate(int age, SurvRateGroup* surv_rate_group) { |
562 TruncatedSeq* seq = surv_rate_group->get_seq(age); | |
342 | 563 if (seq->num() == 0) |
564 gclog_or_tty->print("BARF! age is %d", age); | |
565 guarantee( seq->num() > 0, "invariant" ); | |
566 double pred = get_new_prediction(seq); | |
567 if (pred > 1.0) | |
568 pred = 1.0; | |
569 return pred; | |
570 } | |
571 | |
545 | 572 double predict_yg_surv_rate(int age) { |
573 return predict_yg_surv_rate(age, _short_lived_surv_rate_group); | |
574 } | |
575 | |
342 | 576 double accum_yg_surv_rate_pred(int age) { |
577 return _short_lived_surv_rate_group->accum_surv_rate_pred(age); | |
578 } | |
579 | |
4013 | 580 private: |
1611 | 581 void print_stats(int level, const char* str, double value); |
582 void print_stats(int level, const char* str, int value); | |
583 | |
2430 | 584 void print_par_stats(int level, const char* str, double* data); |
585 void print_par_sizes(int level, const char* str, double* data); | |
342 | 586 |
587 void check_other_times(int level, | |
588 NumberSeq* other_times_ms, | |
589 NumberSeq* calc_other_times_ms) const; | |
590 | |
591 void print_summary (PauseSummary* stats) const; | |
592 | |
593 void print_summary (int level, const char* str, NumberSeq* seq) const; | |
594 void print_summary_sd (int level, const char* str, NumberSeq* seq) const; | |
595 | |
596 double avg_value (double* data); | |
597 double max_value (double* data); | |
598 double sum_of_values (double* data); | |
599 double max_sum (double* data1, double* data2); | |
600 | |
601 double _last_pause_time_ms; | |
602 | |
603 size_t _bytes_in_collection_set_before_gc; | |
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604 size_t _bytes_copied_during_gc; |
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605 |
342 | 606 // Used to count used bytes in CS. |
607 friend class CountCSClosure; | |
608 | |
609 // Statistics kept per GC stoppage, pause or full. | |
610 TruncatedSeq* _recent_prev_end_times_for_all_gcs_sec; | |
611 | |
612 // Add a new GC of the given duration and end time to the record. | |
613 void update_recent_gc_times(double end_time_sec, double elapsed_ms); | |
614 | |
615 // The head of the list (via "next_in_collection_set()") representing the | |
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616 // current collection set. Set from the incrementally built collection |
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617 // set at the start of the pause. |
342 | 618 HeapRegion* _collection_set; |
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619 |
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620 // The number of bytes in the collection set before the pause. Set from |
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621 // the incrementally built collection set at the start of an evacuation |
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622 // pause. |
342 | 623 size_t _collection_set_bytes_used_before; |
624 | |
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625 // The associated information that is maintained while the incremental |
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626 // collection set is being built with young regions. Used to populate |
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627 // the recorded info for the evacuation pause. |
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628 |
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629 enum CSetBuildType { |
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630 Active, // We are actively building the collection set |
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631 Inactive // We are not actively building the collection set |
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632 }; |
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633 |
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634 CSetBuildType _inc_cset_build_state; |
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635 |
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636 // The head of the incrementally built collection set. |
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637 HeapRegion* _inc_cset_head; |
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638 |
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639 // The tail of the incrementally built collection set. |
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640 HeapRegion* _inc_cset_tail; |
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641 |
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642 // The number of bytes in the incrementally built collection set. |
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643 // Used to set _collection_set_bytes_used_before at the start of |
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644 // an evacuation pause. |
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645 size_t _inc_cset_bytes_used_before; |
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646 |
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647 // Used to record the highest end of heap region in collection set |
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648 HeapWord* _inc_cset_max_finger; |
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649 |
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650 // The RSet lengths recorded for regions in the CSet. It is updated |
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651 // by the thread that adds a new region to the CSet. We assume that |
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652 // only one thread can be allocating a new CSet region (currently, |
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653 // it does so after taking the Heap_lock) hence no need to |
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654 // synchronize updates to this field. |
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655 size_t _inc_cset_recorded_rs_lengths; |
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656 |
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657 // A concurrent refinement thread periodcially samples the young |
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658 // region RSets and needs to update _inc_cset_recorded_rs_lengths as |
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659 // the RSets grow. Instead of having to syncronize updates to that |
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660 // field we accumulate them in this field and add it to |
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661 // _inc_cset_recorded_rs_lengths_diffs at the start of a GC. |
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662 ssize_t _inc_cset_recorded_rs_lengths_diffs; |
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663 |
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664 // The predicted elapsed time it will take to collect the regions in |
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665 // the CSet. This is updated by the thread that adds a new region to |
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666 // the CSet. See the comment for _inc_cset_recorded_rs_lengths about |
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667 // MT-safety assumptions. |
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668 double _inc_cset_predicted_elapsed_time_ms; |
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669 |
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670 // See the comment for _inc_cset_recorded_rs_lengths_diffs. |
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671 double _inc_cset_predicted_elapsed_time_ms_diffs; |
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672 |
342 | 673 // Stash a pointer to the g1 heap. |
674 G1CollectedHeap* _g1; | |
675 | |
676 // The ratio of gc time to elapsed time, computed over recent pauses. | |
677 double _recent_avg_pause_time_ratio; | |
678 | |
679 double recent_avg_pause_time_ratio() { | |
680 return _recent_avg_pause_time_ratio; | |
681 } | |
682 | |
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683 // At the end of a pause we check the heap occupancy and we decide |
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684 // whether we will start a marking cycle during the next pause. If |
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685 // we decide that we want to do that, we will set this parameter to |
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686 // true. So, this parameter will stay true between the end of a |
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687 // pause and the beginning of a subsequent pause (not necessarily |
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688 // the next one, see the comments on the next field) when we decide |
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689 // that we will indeed start a marking cycle and do the initial-mark |
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690 // work. |
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691 volatile bool _initiate_conc_mark_if_possible; |
342 | 692 |
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693 // If initiate_conc_mark_if_possible() is set at the beginning of a |
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694 // pause, it is a suggestion that the pause should start a marking |
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695 // cycle by doing the initial-mark work. However, it is possible |
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696 // that the concurrent marking thread is still finishing up the |
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697 // previous marking cycle (e.g., clearing the next marking |
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698 // bitmap). If that is the case we cannot start a new cycle and |
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699 // we'll have to wait for the concurrent marking thread to finish |
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700 // what it is doing. In this case we will postpone the marking cycle |
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701 // initiation decision for the next pause. When we eventually decide |
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702 // to start a cycle, we will set _during_initial_mark_pause which |
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703 // will stay true until the end of the initial-mark pause and it's |
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704 // the condition that indicates that a pause is doing the |
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705 // initial-mark work. |
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706 volatile bool _during_initial_mark_pause; |
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707 |
4710 | 708 bool _last_young_gc; |
342 | 709 |
710 // This set of variables tracks the collector efficiency, in order to | |
711 // determine whether we should initiate a new marking. | |
712 double _cur_mark_stop_world_time_ms; | |
713 double _mark_remark_start_sec; | |
714 double _mark_cleanup_start_sec; | |
715 double _mark_closure_time_ms; | |
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716 double _root_region_scan_wait_time_ms; |
342 | 717 |
3919
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718 // Update the young list target length either by setting it to the |
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719 // desired fixed value or by calculating it using G1's pause |
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720 // prediction model. If no rs_lengths parameter is passed, predict |
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721 // the RS lengths using the prediction model, otherwise use the |
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722 // given rs_lengths as the prediction. |
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|
723 void update_young_list_target_length(size_t rs_lengths = (size_t) -1); |
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724 |
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725 // Calculate and return the minimum desired young list target |
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726 // length. This is the minimum 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_min_length(size_t base_min_length); |
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729 |
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730 // Calculate and return the maximum desired young list target |
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731 // length. This is the maximum desired young list length according |
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732 // to the user's inputs. |
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733 size_t calculate_young_list_desired_max_length(); |
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734 |
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735 // Calculate and return the maximum young list target length that |
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736 // can fit into the pause time goal. The parameters are: rs_lengths |
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737 // represent the prediction of how large the young RSet lengths will |
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738 // be, base_min_length is the alreay existing number of regions in |
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739 // the young list, min_length and max_length are the desired min and |
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740 // max young list length according to the user's inputs. |
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741 size_t calculate_young_list_target_length(size_t rs_lengths, |
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742 size_t base_min_length, |
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743 size_t desired_min_length, |
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744 size_t desired_max_length); |
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745 |
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746 // Check whether a given young length (young_length) fits into the |
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747 // given target pause time and whether the prediction for the amount |
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748 // of objects to be copied for the given length will fit into the |
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749 // given free space (expressed by base_free_regions). It is used by |
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750 // calculate_young_list_target_length(). |
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751 bool predict_will_fit(size_t young_length, double base_time_ms, |
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752 size_t base_free_regions, double target_pause_time_ms); |
342 | 753 |
4013 | 754 // Count the number of bytes used in the CS. |
755 void count_CS_bytes_used(); | |
756 | |
342 | 757 public: |
758 | |
759 G1CollectorPolicy(); | |
760 | |
761 virtual G1CollectorPolicy* as_g1_policy() { return this; } | |
762 | |
763 virtual CollectorPolicy::Name kind() { | |
764 return CollectorPolicy::G1CollectorPolicyKind; | |
765 } | |
766 | |
3919
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767 // Check the current value of the young list RSet lengths and |
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768 // compare it against the last prediction. If the current value is |
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769 // higher, recalculate the young list target length prediction. |
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770 void revise_young_list_target_length_if_necessary(); |
342 | 771 |
772 size_t bytes_in_collection_set() { | |
773 return _bytes_in_collection_set_before_gc; | |
774 } | |
775 | |
776 unsigned calc_gc_alloc_time_stamp() { | |
777 return _all_pause_times_ms->num() + 1; | |
778 } | |
779 | |
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780 // This should be called after the heap is resized. |
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781 void record_new_heap_size(size_t new_number_of_regions); |
3919
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782 |
4013 | 783 void init(); |
342 | 784 |
545 | 785 // Create jstat counters for the policy. |
786 virtual void initialize_gc_policy_counters(); | |
787 | |
342 | 788 virtual HeapWord* mem_allocate_work(size_t size, |
789 bool is_tlab, | |
790 bool* gc_overhead_limit_was_exceeded); | |
791 | |
792 // This method controls how a collector handles one or more | |
793 // of its generations being fully allocated. | |
794 virtual HeapWord* satisfy_failed_allocation(size_t size, | |
795 bool is_tlab); | |
796 | |
797 BarrierSet::Name barrier_set_name() { return BarrierSet::G1SATBCTLogging; } | |
798 | |
799 GenRemSet::Name rem_set_name() { return GenRemSet::CardTable; } | |
800 | |
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801 bool need_to_start_conc_mark(const char* source, size_t alloc_word_size = 0); |
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802 |
342 | 803 // Update the heuristic info to record a collection pause of the given |
804 // start time, where the given number of bytes were used at the start. | |
805 // This may involve changing the desired size of a collection set. | |
806 | |
4013 | 807 void record_stop_world_start(); |
342 | 808 |
4013 | 809 void record_collection_pause_start(double start_time_sec, size_t start_used); |
342 | 810 |
811 // Must currently be called while the world is stopped. | |
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812 void record_concurrent_mark_init_end(double |
342 | 813 mark_init_elapsed_time_ms); |
814 | |
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815 void record_mark_closure_time(double mark_closure_time_ms) { |
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816 _mark_closure_time_ms = mark_closure_time_ms; |
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817 } |
342 | 818 |
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819 void record_root_region_scan_wait_time(double time_ms) { |
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820 _root_region_scan_wait_time_ms = time_ms; |
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821 } |
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822 |
4013 | 823 void record_concurrent_mark_remark_start(); |
824 void record_concurrent_mark_remark_end(); | |
342 | 825 |
4013 | 826 void record_concurrent_mark_cleanup_start(); |
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827 void record_concurrent_mark_cleanup_end(int no_of_gc_threads); |
4013 | 828 void record_concurrent_mark_cleanup_completed(); |
342 | 829 |
4013 | 830 void record_concurrent_pause(); |
831 void record_concurrent_pause_end(); | |
342 | 832 |
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833 void record_collection_pause_end(int no_of_gc_threads); |
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834 void print_heap_transition(); |
342 | 835 |
836 // Record the fact that a full collection occurred. | |
4013 | 837 void record_full_collection_start(); |
838 void record_full_collection_end(); | |
342 | 839 |
1611 | 840 void record_gc_worker_start_time(int worker_i, double ms) { |
841 _par_last_gc_worker_start_times_ms[worker_i] = ms; | |
842 } | |
843 | |
342 | 844 void record_ext_root_scan_time(int worker_i, double ms) { |
845 _par_last_ext_root_scan_times_ms[worker_i] = ms; | |
846 } | |
847 | |
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848 void record_satb_filtering_time(int worker_i, double ms) { |
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849 _par_last_satb_filtering_times_ms[worker_i] = ms; |
342 | 850 } |
851 | |
852 void record_satb_drain_time(double ms) { | |
4023 | 853 assert(_g1->mark_in_progress(), "shouldn't be here otherwise"); |
342 | 854 _cur_satb_drain_time_ms = ms; |
855 } | |
856 | |
857 void record_update_rs_time(int thread, double ms) { | |
858 _par_last_update_rs_times_ms[thread] = ms; | |
859 } | |
860 | |
861 void record_update_rs_processed_buffers (int thread, | |
862 double processed_buffers) { | |
863 _par_last_update_rs_processed_buffers[thread] = processed_buffers; | |
864 } | |
865 | |
866 void record_scan_rs_time(int thread, double ms) { | |
867 _par_last_scan_rs_times_ms[thread] = ms; | |
868 } | |
869 | |
870 void reset_obj_copy_time(int thread) { | |
871 _par_last_obj_copy_times_ms[thread] = 0.0; | |
872 } | |
873 | |
874 void reset_obj_copy_time() { | |
875 reset_obj_copy_time(0); | |
876 } | |
877 | |
878 void record_obj_copy_time(int thread, double ms) { | |
879 _par_last_obj_copy_times_ms[thread] += ms; | |
880 } | |
881 | |
1611 | 882 void record_termination(int thread, double ms, size_t attempts) { |
883 _par_last_termination_times_ms[thread] = ms; | |
884 _par_last_termination_attempts[thread] = (double) attempts; | |
342 | 885 } |
886 | |
1611 | 887 void record_gc_worker_end_time(int worker_i, double ms) { |
888 _par_last_gc_worker_end_times_ms[worker_i] = ms; | |
342 | 889 } |
890 | |
595
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|
891 void record_pause_time_ms(double ms) { |
342 | 892 _last_pause_time_ms = ms; |
893 } | |
894 | |
895 void record_clear_ct_time(double ms) { | |
896 _cur_clear_ct_time_ms = ms; | |
897 } | |
898 | |
899 void record_par_time(double ms) { | |
900 _cur_collection_par_time_ms = ms; | |
901 } | |
902 | |
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|
903 void record_code_root_fixup_time(double ms) { |
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904 _cur_collection_code_root_fixup_time_ms = ms; |
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|
905 } |
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|
906 |
342 | 907 void record_aux_start_time(int i) { |
908 guarantee(i < _aux_num, "should be within range"); | |
909 _cur_aux_start_times_ms[i] = os::elapsedTime() * 1000.0; | |
910 } | |
911 | |
912 void record_aux_end_time(int i) { | |
913 guarantee(i < _aux_num, "should be within range"); | |
914 double ms = os::elapsedTime() * 1000.0 - _cur_aux_start_times_ms[i]; | |
915 _cur_aux_times_set[i] = true; | |
916 _cur_aux_times_ms[i] += ms; | |
917 } | |
918 | |
3979
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|
919 void record_ref_proc_time(double ms) { |
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|
920 _cur_ref_proc_time_ms = ms; |
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|
921 } |
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|
922 |
4dfb2df418f2
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|
923 void record_ref_enq_time(double ms) { |
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|
924 _cur_ref_enq_time_ms = ms; |
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|
925 } |
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|
926 |
890
6cb8e9df7174
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diff
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|
927 #ifndef PRODUCT |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
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diff
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|
928 void record_cc_clear_time(double ms) { |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
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diff
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|
929 if (_min_clear_cc_time_ms < 0.0 || ms <= _min_clear_cc_time_ms) |
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6819077: G1: first GC thread coming late into the GC.
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|
930 _min_clear_cc_time_ms = ms; |
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6819077: G1: first GC thread coming late into the GC.
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diff
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|
931 if (_max_clear_cc_time_ms < 0.0 || ms >= _max_clear_cc_time_ms) |
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6819077: G1: first GC thread coming late into the GC.
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|
932 _max_clear_cc_time_ms = ms; |
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6819077: G1: first GC thread coming late into the GC.
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|
933 _cur_clear_cc_time_ms = ms; |
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|
934 _cum_clear_cc_time_ms += ms; |
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diff
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|
935 _num_cc_clears++; |
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diff
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|
936 } |
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diff
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|
937 #endif |
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diff
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|
938 |
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f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
939 // Record how much space we copied during a GC. This is typically |
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|
940 // called when a GC alloc region is being retired. |
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|
941 void record_bytes_copied_during_gc(size_t bytes) { |
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|
942 _bytes_copied_during_gc += bytes; |
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|
943 } |
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|
944 |
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|
945 // The amount of space we copied during a GC. |
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|
946 size_t bytes_copied_during_gc() { |
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|
947 return _bytes_copied_during_gc; |
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|
948 } |
342 | 949 |
5972
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|
950 // Determine whether there are candidate regions so that the |
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7156764: Remove unused size parameter from some CollectedHeap methods
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|
951 // next GC should be mixed. The two action strings are used |
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952 // 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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|
953 bool next_gc_should_be_mixed(const char* true_action_str, |
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|
954 const char* false_action_str); |
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|
955 |
342 | 956 // Choose a new collection set. Marks the chosen regions as being |
957 // "in_collection_set", and links them together. The head and number of | |
958 // the collection set are available via access methods. | |
4912
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|
959 void finalize_cset(double target_pause_time_ms); |
342 | 960 |
961 // The head of the list (via "next_in_collection_set()") representing the | |
962 // current collection set. | |
963 HeapRegion* collection_set() { return _collection_set; } | |
964 | |
1394
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|
965 void clear_collection_set() { _collection_set = NULL; } |
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|
966 |
4090
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diff
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|
967 // Add old region "hr" to the CSet. |
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7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
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|
968 void add_old_region_to_cset(HeapRegion* hr); |
342 | 969 |
1394
1316cec51b4d
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|
970 // Incremental CSet Support |
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|
971 |
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|
972 // The head of the incrementally built collection set. |
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|
973 HeapRegion* inc_cset_head() { return _inc_cset_head; } |
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|
974 |
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|
975 // The tail of the incrementally built collection set. |
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|
976 HeapRegion* inc_set_tail() { return _inc_cset_tail; } |
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|
977 |
1316cec51b4d
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|
978 // Initialize incremental collection set info. |
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979 void start_incremental_cset_building(); |
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980 |
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981 // Perform any final calculations on the incremental CSet fields |
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982 // before we can use them. |
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983 void finalize_incremental_cset_building(); |
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984 |
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985 void clear_incremental_cset() { |
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986 _inc_cset_head = NULL; |
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987 _inc_cset_tail = NULL; |
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988 } |
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989 |
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990 // Stop adding regions to the incremental collection set |
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991 void stop_incremental_cset_building() { _inc_cset_build_state = Inactive; } |
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992 |
4727
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993 // Add information about hr to the aggregated information for the |
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994 // incrementally built collection set. |
1394
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995 void add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length); |
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996 |
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997 // Update information about hr in the aggregated information for |
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998 // the incrementally built collection set. |
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999 void update_incremental_cset_info(HeapRegion* hr, size_t new_rs_length); |
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1000 |
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1001 private: |
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1002 // Update the incremental cset information when adding a region |
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1003 // (should not be called directly). |
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1004 void add_region_to_incremental_cset_common(HeapRegion* hr); |
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1005 |
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1006 public: |
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1007 // Add hr to the LHS of the incremental collection set. |
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1008 void add_region_to_incremental_cset_lhs(HeapRegion* hr); |
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1009 |
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1010 // Add hr to the RHS of the incremental collection set. |
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1011 void add_region_to_incremental_cset_rhs(HeapRegion* hr); |
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1012 |
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1013 #ifndef PRODUCT |
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1014 void print_collection_set(HeapRegion* list_head, outputStream* st); |
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1015 #endif // !PRODUCT |
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1016 |
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1017 bool initiate_conc_mark_if_possible() { return _initiate_conc_mark_if_possible; } |
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1018 void set_initiate_conc_mark_if_possible() { _initiate_conc_mark_if_possible = true; } |
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1019 void clear_initiate_conc_mark_if_possible() { _initiate_conc_mark_if_possible = false; } |
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1020 |
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1021 bool during_initial_mark_pause() { return _during_initial_mark_pause; } |
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1022 void set_during_initial_mark_pause() { _during_initial_mark_pause = true; } |
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1023 void clear_during_initial_mark_pause(){ _during_initial_mark_pause = false; } |
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1024 |
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1025 // This sets the initiate_conc_mark_if_possible() flag to start a |
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1026 // new cycle, as long as we are not already in one. It's best if it |
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1027 // is called during a safepoint when the test whether a cycle is in |
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1028 // progress or not is stable. |
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1029 bool force_initial_mark_if_outside_cycle(GCCause::Cause gc_cause); |
1656
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1030 |
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1031 // This is called at the very beginning of an evacuation pause (it |
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1032 // has to be the first thing that the pause does). If |
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1033 // initiate_conc_mark_if_possible() is true, and the concurrent |
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1034 // marking thread has completed its work during the previous cycle, |
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1035 // it will set during_initial_mark_pause() to so that the pause does |
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1036 // the initial-mark work and start a marking cycle. |
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1037 void decide_on_conc_mark_initiation(); |
342 | 1038 |
1039 // If an expansion would be appropriate, because recent GC overhead had | |
1040 // exceeded the desired limit, return an amount to expand by. | |
4013 | 1041 size_t expansion_amount(); |
342 | 1042 |
1043 #ifndef PRODUCT | |
1044 // Check any appropriate marked bytes info, asserting false if | |
1045 // something's wrong, else returning "true". | |
4013 | 1046 bool assertMarkedBytesDataOK(); |
342 | 1047 #endif |
1048 | |
1049 // Print tracing information. | |
1050 void print_tracing_info() const; | |
1051 | |
1052 // Print stats on young survival ratio | |
1053 void print_yg_surv_rate_info() const; | |
1054 | |
545 | 1055 void finished_recalculating_age_indexes(bool is_survivors) { |
1056 if (is_survivors) { | |
1057 _survivor_surv_rate_group->finished_recalculating_age_indexes(); | |
1058 } else { | |
1059 _short_lived_surv_rate_group->finished_recalculating_age_indexes(); | |
1060 } | |
342 | 1061 // do that for any other surv rate groups |
1062 } | |
1063 | |
1973 | 1064 bool is_young_list_full() { |
1065 size_t young_list_length = _g1->young_list()->length(); | |
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1066 size_t young_list_target_length = _young_list_target_length; |
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1067 return young_list_length >= young_list_target_length; |
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1068 } |
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1069 |
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1070 bool can_expand_young_list() { |
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1071 size_t young_list_length = _g1->young_list()->length(); |
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1072 size_t young_list_max_length = _young_list_max_length; |
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1073 return young_list_length < young_list_max_length; |
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1074 } |
1973 | 1075 |
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1076 size_t young_list_max_length() { |
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1077 return _young_list_max_length; |
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1078 } |
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1079 |
4710 | 1080 bool gcs_are_young() { |
1081 return _gcs_are_young; | |
342 | 1082 } |
4710 | 1083 void set_gcs_are_young(bool gcs_are_young) { |
1084 _gcs_are_young = gcs_are_young; | |
342 | 1085 } |
1086 | |
1087 bool adaptive_young_list_length() { | |
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1088 return _young_gen_sizer->adaptive_young_list_length(); |
342 | 1089 } |
1090 | |
1091 inline double get_gc_eff_factor() { | |
1092 double ratio = _known_garbage_ratio; | |
1093 | |
1094 double square = ratio * ratio; | |
1095 // square = square * square; | |
1096 double ret = square * 9.0 + 1.0; | |
1097 #if 0 | |
1098 gclog_or_tty->print_cr("ratio = %1.2lf, ret = %1.2lf", ratio, ret); | |
1099 #endif // 0 | |
1100 guarantee(0.0 <= ret && ret < 10.0, "invariant!"); | |
1101 return ret; | |
1102 } | |
1103 | |
4013 | 1104 private: |
342 | 1105 // |
1106 // Survivor regions policy. | |
1107 // | |
1108 | |
1109 // Current tenuring threshold, set to 0 if the collector reaches the | |
1110 // maximum amount of suvivors regions. | |
1111 int _tenuring_threshold; | |
1112 | |
545 | 1113 // The limit on the number of regions allocated for survivors. |
1114 size_t _max_survivor_regions; | |
1115 | |
3764
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1116 // For reporting purposes. |
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1117 size_t _eden_bytes_before_gc; |
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1118 size_t _survivor_bytes_before_gc; |
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1119 size_t _capacity_before_gc; |
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1120 |
545 | 1121 // The amount of survor regions after a collection. |
1122 size_t _recorded_survivor_regions; | |
1123 // List of survivor regions. | |
1124 HeapRegion* _recorded_survivor_head; | |
1125 HeapRegion* _recorded_survivor_tail; | |
1126 | |
1127 ageTable _survivors_age_table; | |
1128 | |
342 | 1129 public: |
1130 | |
1131 inline GCAllocPurpose | |
1132 evacuation_destination(HeapRegion* src_region, int age, size_t word_sz) { | |
1133 if (age < _tenuring_threshold && src_region->is_young()) { | |
1134 return GCAllocForSurvived; | |
1135 } else { | |
1136 return GCAllocForTenured; | |
1137 } | |
1138 } | |
1139 | |
1140 inline bool track_object_age(GCAllocPurpose purpose) { | |
1141 return purpose == GCAllocForSurvived; | |
1142 } | |
1143 | |
545 | 1144 static const size_t REGIONS_UNLIMITED = ~(size_t)0; |
1145 | |
1146 size_t max_regions(int purpose); | |
342 | 1147 |
1148 // The limit on regions for a particular purpose is reached. | |
1149 void note_alloc_region_limit_reached(int purpose) { | |
1150 if (purpose == GCAllocForSurvived) { | |
1151 _tenuring_threshold = 0; | |
1152 } | |
1153 } | |
1154 | |
1155 void note_start_adding_survivor_regions() { | |
1156 _survivor_surv_rate_group->start_adding_regions(); | |
1157 } | |
1158 | |
1159 void note_stop_adding_survivor_regions() { | |
1160 _survivor_surv_rate_group->stop_adding_regions(); | |
1161 } | |
545 | 1162 |
1163 void record_survivor_regions(size_t regions, | |
1164 HeapRegion* head, | |
1165 HeapRegion* tail) { | |
1166 _recorded_survivor_regions = regions; | |
1167 _recorded_survivor_head = head; | |
1168 _recorded_survivor_tail = tail; | |
1169 } | |
1170 | |
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1171 size_t recorded_survivor_regions() { |
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1172 return _recorded_survivor_regions; |
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1173 } |
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1174 |
545 | 1175 void record_thread_age_table(ageTable* age_table) |
1176 { | |
1177 _survivors_age_table.merge_par(age_table); | |
1178 } | |
1179 | |
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1180 void update_max_gc_locker_expansion(); |
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1181 |
545 | 1182 // Calculates survivor space parameters. |
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1183 void update_survivors_policy(); |
545 | 1184 |
342 | 1185 }; |
1186 | |
1187 // This should move to some place more general... | |
1188 | |
1189 // If we have "n" measurements, and we've kept track of their "sum" and the | |
1190 // "sum_of_squares" of the measurements, this returns the variance of the | |
1191 // sequence. | |
1192 inline double variance(int n, double sum_of_squares, double sum) { | |
1193 double n_d = (double)n; | |
1194 double avg = sum/n_d; | |
1195 return (sum_of_squares - 2.0 * avg * sum + n_d * avg * avg) / n_d; | |
1196 } | |
1197 | |
1972 | 1198 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTORPOLICY_HPP |