Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.hpp @ 8081:579f6adb7f51
8003539: Minimal VM don't react to -Dcom.sun.management and -XX:+ManagementServer
Summary: A warning message should be displayed if these options are used with the Minimal VM.
Reviewed-by: dholmes, dsamersoff
author | jprovino |
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date | Tue, 05 Feb 2013 13:32:34 -0500 |
parents | 37f7535e5f18 |
children | 27714220e50e |
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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; | |
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39 class G1GCPhaseTimes; |
342 | 40 |
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41 // TraceGen0Time collects data on _both_ young and mixed evacuation pauses |
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42 // (the latter may contain non-young regions - i.e. regions that are |
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43 // technically in Gen1) while TraceGen1Time collects data about full GCs. |
6197 | 44 class TraceGen0TimeData : public CHeapObj<mtGC> { |
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45 private: |
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46 unsigned _young_pause_num; |
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47 unsigned _mixed_pause_num; |
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48 |
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49 NumberSeq _all_stop_world_times_ms; |
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50 NumberSeq _all_yield_times_ms; |
342 | 51 |
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52 NumberSeq _total; |
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53 NumberSeq _other; |
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54 NumberSeq _root_region_scan_wait; |
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55 NumberSeq _parallel; |
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56 NumberSeq _ext_root_scan; |
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57 NumberSeq _satb_filtering; |
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58 NumberSeq _update_rs; |
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59 NumberSeq _scan_rs; |
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60 NumberSeq _obj_copy; |
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61 NumberSeq _termination; |
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62 NumberSeq _parallel_other; |
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63 NumberSeq _clear_ct; |
342 | 64 |
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65 void print_summary(const char* str, const NumberSeq* seq) const; |
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66 void print_summary_sd(const char* str, const NumberSeq* seq) const; |
342 | 67 |
68 public: | |
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69 TraceGen0TimeData() : _young_pause_num(0), _mixed_pause_num(0) {}; |
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70 void record_start_collection(double time_to_stop_the_world_ms); |
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71 void record_yield_time(double yield_time_ms); |
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72 void record_end_collection(double pause_time_ms, G1GCPhaseTimes* phase_times); |
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73 void increment_young_collection_count(); |
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74 void increment_mixed_collection_count(); |
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75 void print() const; |
342 | 76 }; |
77 | |
6197 | 78 class TraceGen1TimeData : public CHeapObj<mtGC> { |
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79 private: |
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80 NumberSeq _all_full_gc_times; |
342 | 81 |
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82 public: |
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83 void record_full_collection(double full_gc_time_ms); |
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84 void print() const; |
342 | 85 }; |
86 | |
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87 // There are three command line options related to the young gen size: |
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88 // NewSize, MaxNewSize and NewRatio (There is also -Xmn, but that is |
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89 // just a short form for NewSize==MaxNewSize). G1 will use its internal |
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90 // heuristics to calculate the actual young gen size, so these options |
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91 // basically only limit the range within which G1 can pick a young gen |
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92 // size. Also, these are general options taking byte sizes. G1 will |
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93 // internally work with a number of regions instead. So, some rounding |
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94 // will occur. |
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95 // |
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96 // If nothing related to the the young gen size is set on the command |
7449 | 97 // line we should allow the young gen to be between G1NewSizePercent |
98 // and G1MaxNewSizePercent of the heap size. This means that every time | |
99 // the heap size changes, the limits for the young gen size will be | |
100 // recalculated. | |
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101 // |
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102 // If only -XX:NewSize is set we should use the specified value as the |
7449 | 103 // minimum size for young gen. Still using G1MaxNewSizePercent of the |
104 // heap as maximum. | |
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105 // |
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106 // If only -XX:MaxNewSize is set we should use the specified value as the |
7449 | 107 // maximum size for young gen. Still using G1NewSizePercent of the heap |
108 // as minimum. | |
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109 // |
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110 // If -XX:NewSize and -XX:MaxNewSize are both specified we use these values. |
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111 // No updates when the heap size changes. There is a special case when |
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112 // NewSize==MaxNewSize. This is interpreted as "fixed" and will use a |
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113 // different heuristic for calculating the collection set when we do mixed |
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114 // collection. |
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115 // |
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116 // If only -XX:NewRatio is set we should use the specified ratio of the heap |
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117 // as both min and max. This will be interpreted as "fixed" just like the |
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118 // NewSize==MaxNewSize case above. But we will update the min and max |
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119 // everytime the heap size changes. |
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120 // |
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121 // NewSize and MaxNewSize override NewRatio. So, NewRatio is ignored if it is |
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122 // combined with either NewSize or MaxNewSize. (A warning message is printed.) |
6197 | 123 class G1YoungGenSizer : public CHeapObj<mtGC> { |
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124 private: |
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125 enum SizerKind { |
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126 SizerDefaults, |
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127 SizerNewSizeOnly, |
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128 SizerMaxNewSizeOnly, |
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129 SizerMaxAndNewSize, |
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130 SizerNewRatio |
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131 }; |
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132 SizerKind _sizer_kind; |
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133 uint _min_desired_young_length; |
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134 uint _max_desired_young_length; |
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135 bool _adaptive_size; |
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136 uint calculate_default_min_length(uint new_number_of_heap_regions); |
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137 uint calculate_default_max_length(uint new_number_of_heap_regions); |
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138 |
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139 public: |
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140 G1YoungGenSizer(); |
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141 void heap_size_changed(uint new_number_of_heap_regions); |
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142 uint min_desired_young_length() { |
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143 return _min_desired_young_length; |
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144 } |
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145 uint max_desired_young_length() { |
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146 return _max_desired_young_length; |
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147 } |
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148 bool adaptive_young_list_length() { |
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149 return _adaptive_size; |
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150 } |
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151 }; |
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152 |
342 | 153 class G1CollectorPolicy: public CollectorPolicy { |
4013 | 154 private: |
342 | 155 // either equal to the number of parallel threads, if ParallelGCThreads |
156 // has been set, or 1 otherwise | |
157 int _parallel_gc_threads; | |
158 | |
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159 // The number of GC threads currently active. |
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160 uintx _no_of_gc_threads; |
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161 |
342 | 162 enum SomePrivateConstants { |
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163 NumPrevPausesForHeuristics = 10 |
342 | 164 }; |
165 | |
166 G1MMUTracker* _mmu_tracker; | |
167 | |
168 void initialize_flags(); | |
169 | |
170 void initialize_all() { | |
171 initialize_flags(); | |
172 initialize_size_info(); | |
173 } | |
174 | |
4013 | 175 CollectionSetChooser* _collectionSetChooser; |
342 | 176 |
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177 double _full_collection_start_sec; |
342 | 178 size_t _cur_collection_pause_used_at_start_bytes; |
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179 uint _cur_collection_pause_used_regions_at_start; |
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180 |
342 | 181 // These exclude marking times. |
182 TruncatedSeq* _recent_gc_times_ms; | |
183 | |
184 TruncatedSeq* _concurrent_mark_remark_times_ms; | |
185 TruncatedSeq* _concurrent_mark_cleanup_times_ms; | |
186 | |
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187 TraceGen0TimeData _trace_gen0_time_data; |
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188 TraceGen1TimeData _trace_gen1_time_data; |
342 | 189 |
190 double _stop_world_start; | |
191 | |
4710 | 192 // indicates whether we are in young or mixed GC mode |
193 bool _gcs_are_young; | |
342 | 194 |
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195 uint _young_list_target_length; |
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196 uint _young_list_fixed_length; |
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197 size_t _prev_eden_capacity; // used for logging |
342 | 198 |
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199 // The max number of regions we can extend the eden by while the GC |
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200 // locker is active. This should be >= _young_list_target_length; |
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201 uint _young_list_max_length; |
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202 |
4710 | 203 bool _last_gc_was_young; |
342 | 204 |
205 bool _during_marking; | |
206 bool _in_marking_window; | |
207 bool _in_marking_window_im; | |
208 | |
209 SurvRateGroup* _short_lived_surv_rate_group; | |
210 SurvRateGroup* _survivor_surv_rate_group; | |
211 // add here any more surv rate groups | |
212 | |
1356 | 213 double _gc_overhead_perc; |
214 | |
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215 double _reserve_factor; |
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216 uint _reserve_regions; |
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217 |
342 | 218 bool during_marking() { |
219 return _during_marking; | |
220 } | |
221 | |
222 private: | |
223 enum PredictionConstants { | |
224 TruncatedSeqLength = 10 | |
225 }; | |
226 | |
227 TruncatedSeq* _alloc_rate_ms_seq; | |
228 double _prev_collection_pause_end_ms; | |
229 | |
230 TruncatedSeq* _rs_length_diff_seq; | |
231 TruncatedSeq* _cost_per_card_ms_seq; | |
4710 | 232 TruncatedSeq* _young_cards_per_entry_ratio_seq; |
233 TruncatedSeq* _mixed_cards_per_entry_ratio_seq; | |
342 | 234 TruncatedSeq* _cost_per_entry_ms_seq; |
4710 | 235 TruncatedSeq* _mixed_cost_per_entry_ms_seq; |
342 | 236 TruncatedSeq* _cost_per_byte_ms_seq; |
237 TruncatedSeq* _constant_other_time_ms_seq; | |
238 TruncatedSeq* _young_other_cost_per_region_ms_seq; | |
239 TruncatedSeq* _non_young_other_cost_per_region_ms_seq; | |
240 | |
241 TruncatedSeq* _pending_cards_seq; | |
242 TruncatedSeq* _rs_lengths_seq; | |
243 | |
244 TruncatedSeq* _cost_per_byte_ms_during_cm_seq; | |
245 | |
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246 G1YoungGenSizer* _young_gen_sizer; |
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247 |
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248 uint _eden_cset_region_length; |
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249 uint _survivor_cset_region_length; |
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250 uint _old_cset_region_length; |
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251 |
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252 void init_cset_region_lengths(uint eden_cset_region_length, |
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253 uint survivor_cset_region_length); |
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254 |
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255 uint eden_cset_region_length() { return _eden_cset_region_length; } |
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256 uint survivor_cset_region_length() { return _survivor_cset_region_length; } |
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257 uint old_cset_region_length() { return _old_cset_region_length; } |
342 | 258 |
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259 uint _free_regions_at_end_of_collection; |
342 | 260 |
261 size_t _recorded_rs_lengths; | |
262 size_t _max_rs_lengths; | |
263 double _sigma; | |
264 | |
265 size_t _rs_lengths_prediction; | |
266 | |
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267 double sigma() { return _sigma; } |
342 | 268 |
269 // A function that prevents us putting too much stock in small sample | |
270 // sets. Returns a number between 2.0 and 1.0, depending on the number | |
271 // of samples. 5 or more samples yields one; fewer scales linearly from | |
272 // 2.0 at 1 sample to 1.0 at 5. | |
273 double confidence_factor(int samples) { | |
274 if (samples > 4) return 1.0; | |
275 else return 1.0 + sigma() * ((double)(5 - samples))/2.0; | |
276 } | |
277 | |
278 double get_new_neg_prediction(TruncatedSeq* seq) { | |
279 return seq->davg() - sigma() * seq->dsd(); | |
280 } | |
281 | |
282 #ifndef PRODUCT | |
283 bool verify_young_ages(HeapRegion* head, SurvRateGroup *surv_rate_group); | |
284 #endif // PRODUCT | |
285 | |
1111 | 286 void adjust_concurrent_refinement(double update_rs_time, |
287 double update_rs_processed_buffers, | |
288 double goal_ms); | |
289 | |
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290 uintx no_of_gc_threads() { return _no_of_gc_threads; } |
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291 void set_no_of_gc_threads(uintx v) { _no_of_gc_threads = v; } |
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292 |
342 | 293 double _pause_time_target_ms; |
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294 |
342 | 295 size_t _pending_cards; |
296 | |
297 public: | |
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298 // Accessors |
342 | 299 |
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300 void set_region_eden(HeapRegion* hr, int young_index_in_cset) { |
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301 hr->set_young(); |
342 | 302 hr->install_surv_rate_group(_short_lived_surv_rate_group); |
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303 hr->set_young_index_in_cset(young_index_in_cset); |
342 | 304 } |
305 | |
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306 void set_region_survivor(HeapRegion* hr, int young_index_in_cset) { |
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307 assert(hr->is_young() && hr->is_survivor(), "pre-condition"); |
342 | 308 hr->install_surv_rate_group(_survivor_surv_rate_group); |
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309 hr->set_young_index_in_cset(young_index_in_cset); |
342 | 310 } |
311 | |
312 #ifndef PRODUCT | |
313 bool verify_young_ages(); | |
314 #endif // PRODUCT | |
315 | |
316 double get_new_prediction(TruncatedSeq* seq) { | |
317 return MAX2(seq->davg() + sigma() * seq->dsd(), | |
318 seq->davg() * confidence_factor(seq->num())); | |
319 } | |
320 | |
321 void record_max_rs_lengths(size_t rs_lengths) { | |
322 _max_rs_lengths = rs_lengths; | |
323 } | |
324 | |
325 size_t predict_rs_length_diff() { | |
326 return (size_t) get_new_prediction(_rs_length_diff_seq); | |
327 } | |
328 | |
329 double predict_alloc_rate_ms() { | |
330 return get_new_prediction(_alloc_rate_ms_seq); | |
331 } | |
332 | |
333 double predict_cost_per_card_ms() { | |
334 return get_new_prediction(_cost_per_card_ms_seq); | |
335 } | |
336 | |
337 double predict_rs_update_time_ms(size_t pending_cards) { | |
338 return (double) pending_cards * predict_cost_per_card_ms(); | |
339 } | |
340 | |
4710 | 341 double predict_young_cards_per_entry_ratio() { |
342 return get_new_prediction(_young_cards_per_entry_ratio_seq); | |
342 | 343 } |
344 | |
4710 | 345 double predict_mixed_cards_per_entry_ratio() { |
346 if (_mixed_cards_per_entry_ratio_seq->num() < 2) { | |
347 return predict_young_cards_per_entry_ratio(); | |
348 } else { | |
349 return get_new_prediction(_mixed_cards_per_entry_ratio_seq); | |
350 } | |
342 | 351 } |
352 | |
353 size_t predict_young_card_num(size_t rs_length) { | |
354 return (size_t) ((double) rs_length * | |
4710 | 355 predict_young_cards_per_entry_ratio()); |
342 | 356 } |
357 | |
358 size_t predict_non_young_card_num(size_t rs_length) { | |
359 return (size_t) ((double) rs_length * | |
4710 | 360 predict_mixed_cards_per_entry_ratio()); |
342 | 361 } |
362 | |
363 double predict_rs_scan_time_ms(size_t card_num) { | |
4710 | 364 if (gcs_are_young()) { |
342 | 365 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); |
4710 | 366 } else { |
367 return predict_mixed_rs_scan_time_ms(card_num); | |
368 } | |
342 | 369 } |
370 | |
4710 | 371 double predict_mixed_rs_scan_time_ms(size_t card_num) { |
372 if (_mixed_cost_per_entry_ms_seq->num() < 3) { | |
342 | 373 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); |
4710 | 374 } else { |
375 return (double) (card_num * | |
376 get_new_prediction(_mixed_cost_per_entry_ms_seq)); | |
377 } | |
342 | 378 } |
379 | |
380 double predict_object_copy_time_ms_during_cm(size_t bytes_to_copy) { | |
4710 | 381 if (_cost_per_byte_ms_during_cm_seq->num() < 3) { |
382 return (1.1 * (double) bytes_to_copy) * | |
383 get_new_prediction(_cost_per_byte_ms_seq); | |
384 } else { | |
342 | 385 return (double) bytes_to_copy * |
4710 | 386 get_new_prediction(_cost_per_byte_ms_during_cm_seq); |
387 } | |
342 | 388 } |
389 | |
390 double predict_object_copy_time_ms(size_t bytes_to_copy) { | |
4710 | 391 if (_in_marking_window && !_in_marking_window_im) { |
342 | 392 return predict_object_copy_time_ms_during_cm(bytes_to_copy); |
4710 | 393 } else { |
342 | 394 return (double) bytes_to_copy * |
4710 | 395 get_new_prediction(_cost_per_byte_ms_seq); |
396 } | |
342 | 397 } |
398 | |
399 double predict_constant_other_time_ms() { | |
400 return get_new_prediction(_constant_other_time_ms_seq); | |
401 } | |
402 | |
403 double predict_young_other_time_ms(size_t young_num) { | |
4710 | 404 return (double) young_num * |
405 get_new_prediction(_young_other_cost_per_region_ms_seq); | |
342 | 406 } |
407 | |
408 double predict_non_young_other_time_ms(size_t non_young_num) { | |
4710 | 409 return (double) non_young_num * |
410 get_new_prediction(_non_young_other_cost_per_region_ms_seq); | |
342 | 411 } |
412 | |
413 double predict_base_elapsed_time_ms(size_t pending_cards); | |
414 double predict_base_elapsed_time_ms(size_t pending_cards, | |
415 size_t scanned_cards); | |
416 size_t predict_bytes_to_copy(HeapRegion* hr); | |
6611 | 417 double predict_region_elapsed_time_ms(HeapRegion* hr, bool for_young_gc); |
342 | 418 |
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419 void set_recorded_rs_lengths(size_t rs_lengths); |
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420 |
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421 uint cset_region_length() { return young_cset_region_length() + |
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422 old_cset_region_length(); } |
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423 uint young_cset_region_length() { return eden_cset_region_length() + |
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424 survivor_cset_region_length(); } |
342 | 425 |
545 | 426 double predict_survivor_regions_evac_time(); |
427 | |
342 | 428 void cset_regions_freed() { |
4710 | 429 bool propagate = _last_gc_was_young && !_in_marking_window; |
342 | 430 _short_lived_surv_rate_group->all_surviving_words_recorded(propagate); |
431 _survivor_surv_rate_group->all_surviving_words_recorded(propagate); | |
432 // also call it on any more surv rate groups | |
433 } | |
434 | |
435 G1MMUTracker* mmu_tracker() { | |
436 return _mmu_tracker; | |
437 } | |
438 | |
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439 double max_pause_time_ms() { |
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440 return _mmu_tracker->max_gc_time() * 1000.0; |
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441 } |
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442 |
342 | 443 double predict_remark_time_ms() { |
444 return get_new_prediction(_concurrent_mark_remark_times_ms); | |
445 } | |
446 | |
447 double predict_cleanup_time_ms() { | |
448 return get_new_prediction(_concurrent_mark_cleanup_times_ms); | |
449 } | |
450 | |
451 // Returns an estimate of the survival rate of the region at yg-age | |
452 // "yg_age". | |
545 | 453 double predict_yg_surv_rate(int age, SurvRateGroup* surv_rate_group) { |
454 TruncatedSeq* seq = surv_rate_group->get_seq(age); | |
342 | 455 if (seq->num() == 0) |
456 gclog_or_tty->print("BARF! age is %d", age); | |
457 guarantee( seq->num() > 0, "invariant" ); | |
458 double pred = get_new_prediction(seq); | |
459 if (pred > 1.0) | |
460 pred = 1.0; | |
461 return pred; | |
462 } | |
463 | |
545 | 464 double predict_yg_surv_rate(int age) { |
465 return predict_yg_surv_rate(age, _short_lived_surv_rate_group); | |
466 } | |
467 | |
342 | 468 double accum_yg_surv_rate_pred(int age) { |
469 return _short_lived_surv_rate_group->accum_surv_rate_pred(age); | |
470 } | |
471 | |
4013 | 472 private: |
342 | 473 // Statistics kept per GC stoppage, pause or full. |
474 TruncatedSeq* _recent_prev_end_times_for_all_gcs_sec; | |
475 | |
476 // Add a new GC of the given duration and end time to the record. | |
477 void update_recent_gc_times(double end_time_sec, double elapsed_ms); | |
478 | |
479 // The head of the list (via "next_in_collection_set()") representing the | |
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480 // current collection set. Set from the incrementally built collection |
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481 // set at the start of the pause. |
342 | 482 HeapRegion* _collection_set; |
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483 |
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484 // The number of bytes in the collection set before the pause. Set from |
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485 // the incrementally built collection set at the start of an evacuation |
6611 | 486 // pause, and incremented in finalize_cset() when adding old regions |
487 // (if any) to the collection set. | |
342 | 488 size_t _collection_set_bytes_used_before; |
489 | |
6611 | 490 // The number of bytes copied during the GC. |
491 size_t _bytes_copied_during_gc; | |
492 | |
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493 // The associated information that is maintained while the incremental |
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494 // collection set is being built with young regions. Used to populate |
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495 // the recorded info for the evacuation pause. |
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496 |
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497 enum CSetBuildType { |
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498 Active, // We are actively building the collection set |
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499 Inactive // We are not actively building the collection set |
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500 }; |
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501 |
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502 CSetBuildType _inc_cset_build_state; |
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503 |
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504 // The head of the incrementally built collection set. |
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505 HeapRegion* _inc_cset_head; |
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506 |
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507 // The tail of the incrementally built collection set. |
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508 HeapRegion* _inc_cset_tail; |
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509 |
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510 // The number of bytes in the incrementally built collection set. |
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511 // Used to set _collection_set_bytes_used_before at the start of |
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512 // an evacuation pause. |
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513 size_t _inc_cset_bytes_used_before; |
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514 |
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515 // Used to record the highest end of heap region in collection set |
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516 HeapWord* _inc_cset_max_finger; |
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517 |
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518 // The RSet lengths recorded for regions in the CSet. It is updated |
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519 // by the thread that adds a new region to the CSet. We assume that |
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520 // only one thread can be allocating a new CSet region (currently, |
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521 // it does so after taking the Heap_lock) hence no need to |
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522 // synchronize updates to this field. |
1394
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523 size_t _inc_cset_recorded_rs_lengths; |
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524 |
4727
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525 // A concurrent refinement thread periodcially samples the young |
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526 // region RSets and needs to update _inc_cset_recorded_rs_lengths as |
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527 // the RSets grow. Instead of having to syncronize updates to that |
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528 // field we accumulate them in this field and add it to |
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529 // _inc_cset_recorded_rs_lengths_diffs at the start of a GC. |
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530 ssize_t _inc_cset_recorded_rs_lengths_diffs; |
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531 |
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532 // The predicted elapsed time it will take to collect the regions in |
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533 // the CSet. This is updated by the thread that adds a new region to |
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534 // the CSet. See the comment for _inc_cset_recorded_rs_lengths about |
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535 // MT-safety assumptions. |
1394
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536 double _inc_cset_predicted_elapsed_time_ms; |
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537 |
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538 // See the comment for _inc_cset_recorded_rs_lengths_diffs. |
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539 double _inc_cset_predicted_elapsed_time_ms_diffs; |
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540 |
342 | 541 // Stash a pointer to the g1 heap. |
542 G1CollectedHeap* _g1; | |
543 | |
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544 G1GCPhaseTimes* _phase_times; |
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545 |
342 | 546 // The ratio of gc time to elapsed time, computed over recent pauses. |
547 double _recent_avg_pause_time_ratio; | |
548 | |
549 double recent_avg_pause_time_ratio() { | |
550 return _recent_avg_pause_time_ratio; | |
551 } | |
552 | |
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553 // At the end of a pause we check the heap occupancy and we decide |
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554 // whether we will start a marking cycle during the next pause. If |
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555 // we decide that we want to do that, we will set this parameter to |
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556 // true. So, this parameter will stay true between the end of a |
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557 // pause and the beginning of a subsequent pause (not necessarily |
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558 // the next one, see the comments on the next field) when we decide |
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559 // that we will indeed start a marking cycle and do the initial-mark |
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560 // work. |
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561 volatile bool _initiate_conc_mark_if_possible; |
342 | 562 |
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563 // If initiate_conc_mark_if_possible() is set at the beginning of a |
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564 // pause, it is a suggestion that the pause should start a marking |
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565 // cycle by doing the initial-mark work. However, it is possible |
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566 // that the concurrent marking thread is still finishing up the |
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567 // previous marking cycle (e.g., clearing the next marking |
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568 // bitmap). If that is the case we cannot start a new cycle and |
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569 // we'll have to wait for the concurrent marking thread to finish |
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570 // what it is doing. In this case we will postpone the marking cycle |
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571 // initiation decision for the next pause. When we eventually decide |
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572 // to start a cycle, we will set _during_initial_mark_pause which |
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573 // will stay true until the end of the initial-mark pause and it's |
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574 // the condition that indicates that a pause is doing the |
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575 // initial-mark work. |
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576 volatile bool _during_initial_mark_pause; |
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577 |
4710 | 578 bool _last_young_gc; |
342 | 579 |
580 // This set of variables tracks the collector efficiency, in order to | |
581 // determine whether we should initiate a new marking. | |
582 double _cur_mark_stop_world_time_ms; | |
583 double _mark_remark_start_sec; | |
584 double _mark_cleanup_start_sec; | |
585 | |
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586 // Update the young list target length either by setting it to the |
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587 // desired fixed value or by calculating it using G1's pause |
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588 // prediction model. If no rs_lengths parameter is passed, predict |
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589 // the RS lengths using the prediction model, otherwise use the |
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590 // given rs_lengths as the prediction. |
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591 void update_young_list_target_length(size_t rs_lengths = (size_t) -1); |
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592 |
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593 // Calculate and return the minimum desired young list target |
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594 // length. This is the minimum desired young list length according |
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595 // to the user's inputs. |
6010
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596 uint calculate_young_list_desired_min_length(uint base_min_length); |
3919
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597 |
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598 // Calculate and return the maximum desired young list target |
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599 // length. This is the maximum desired young list length according |
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600 // to the user's inputs. |
6010
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601 uint calculate_young_list_desired_max_length(); |
3919
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602 |
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603 // Calculate and return the maximum young list target length that |
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604 // can fit into the pause time goal. The parameters are: rs_lengths |
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605 // represent the prediction of how large the young RSet lengths will |
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606 // be, base_min_length is the alreay existing number of regions in |
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607 // the young list, min_length and max_length are the desired min and |
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608 // max young list length according to the user's inputs. |
6010
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609 uint calculate_young_list_target_length(size_t rs_lengths, |
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610 uint base_min_length, |
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611 uint desired_min_length, |
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612 uint desired_max_length); |
3919
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613 |
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614 // Check whether a given young length (young_length) fits into the |
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615 // given target pause time and whether the prediction for the amount |
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616 // of objects to be copied for the given length will fit into the |
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617 // given free space (expressed by base_free_regions). It is used by |
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618 // calculate_young_list_target_length(). |
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619 bool predict_will_fit(uint young_length, double base_time_ms, |
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620 uint base_free_regions, double target_pause_time_ms); |
342 | 621 |
622 public: | |
623 | |
624 G1CollectorPolicy(); | |
625 | |
626 virtual G1CollectorPolicy* as_g1_policy() { return this; } | |
627 | |
628 virtual CollectorPolicy::Name kind() { | |
629 return CollectorPolicy::G1CollectorPolicyKind; | |
630 } | |
631 | |
6219
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632 G1GCPhaseTimes* phase_times() const { return _phase_times; } |
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633 |
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634 // Check the current value of the young list RSet lengths and |
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635 // compare it against the last prediction. If the current value is |
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636 // higher, recalculate the young list target length prediction. |
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637 void revise_young_list_target_length_if_necessary(); |
342 | 638 |
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639 // This should be called after the heap is resized. |
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640 void record_new_heap_size(uint new_number_of_regions); |
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641 |
4013 | 642 void init(); |
342 | 643 |
545 | 644 // Create jstat counters for the policy. |
645 virtual void initialize_gc_policy_counters(); | |
646 | |
342 | 647 virtual HeapWord* mem_allocate_work(size_t size, |
648 bool is_tlab, | |
649 bool* gc_overhead_limit_was_exceeded); | |
650 | |
651 // This method controls how a collector handles one or more | |
652 // of its generations being fully allocated. | |
653 virtual HeapWord* satisfy_failed_allocation(size_t size, | |
654 bool is_tlab); | |
655 | |
656 BarrierSet::Name barrier_set_name() { return BarrierSet::G1SATBCTLogging; } | |
657 | |
658 GenRemSet::Name rem_set_name() { return GenRemSet::CardTable; } | |
659 | |
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660 bool need_to_start_conc_mark(const char* source, size_t alloc_word_size = 0); |
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661 |
342 | 662 // Update the heuristic info to record a collection pause of the given |
663 // start time, where the given number of bytes were used at the start. | |
664 // This may involve changing the desired size of a collection set. | |
665 | |
4013 | 666 void record_stop_world_start(); |
342 | 667 |
4013 | 668 void record_collection_pause_start(double start_time_sec, size_t start_used); |
342 | 669 |
670 // Must currently be called while the world is stopped. | |
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671 void record_concurrent_mark_init_end(double |
342 | 672 mark_init_elapsed_time_ms); |
673 | |
4013 | 674 void record_concurrent_mark_remark_start(); |
675 void record_concurrent_mark_remark_end(); | |
342 | 676 |
4013 | 677 void record_concurrent_mark_cleanup_start(); |
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678 void record_concurrent_mark_cleanup_end(int no_of_gc_threads); |
4013 | 679 void record_concurrent_mark_cleanup_completed(); |
342 | 680 |
4013 | 681 void record_concurrent_pause(); |
342 | 682 |
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683 void record_collection_pause_end(double pause_time); |
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684 void print_heap_transition(); |
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685 void print_detailed_heap_transition(); |
342 | 686 |
687 // Record the fact that a full collection occurred. | |
4013 | 688 void record_full_collection_start(); |
689 void record_full_collection_end(); | |
342 | 690 |
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691 // Record how much space we copied during a GC. This is typically |
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692 // called when a GC alloc region is being retired. |
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693 void record_bytes_copied_during_gc(size_t bytes) { |
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694 _bytes_copied_during_gc += bytes; |
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695 } |
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696 |
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697 // The amount of space we copied during a GC. |
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698 size_t bytes_copied_during_gc() { |
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699 return _bytes_copied_during_gc; |
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700 } |
342 | 701 |
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702 // Determine whether there are candidate regions so that the |
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703 // next GC should be mixed. The two action strings are used |
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704 // in the ergo output when the method returns true or false. |
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705 bool next_gc_should_be_mixed(const char* true_action_str, |
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706 const char* false_action_str); |
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707 |
342 | 708 // Choose a new collection set. Marks the chosen regions as being |
709 // "in_collection_set", and links them together. The head and number of | |
710 // the collection set are available via access methods. | |
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711 void finalize_cset(double target_pause_time_ms); |
342 | 712 |
713 // The head of the list (via "next_in_collection_set()") representing the | |
714 // current collection set. | |
715 HeapRegion* collection_set() { return _collection_set; } | |
716 | |
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717 void clear_collection_set() { _collection_set = NULL; } |
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718 |
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719 // Add old region "hr" to the CSet. |
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720 void add_old_region_to_cset(HeapRegion* hr); |
342 | 721 |
1394
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722 // Incremental CSet Support |
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723 |
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724 // The head of the incrementally built collection set. |
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725 HeapRegion* inc_cset_head() { return _inc_cset_head; } |
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726 |
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727 // The tail of the incrementally built collection set. |
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728 HeapRegion* inc_set_tail() { return _inc_cset_tail; } |
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729 |
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730 // Initialize incremental collection set info. |
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731 void start_incremental_cset_building(); |
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732 |
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733 // Perform any final calculations on the incremental CSet fields |
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734 // before we can use them. |
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735 void finalize_incremental_cset_building(); |
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736 |
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737 void clear_incremental_cset() { |
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738 _inc_cset_head = NULL; |
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739 _inc_cset_tail = NULL; |
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740 } |
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741 |
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742 // Stop adding regions to the incremental collection set |
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743 void stop_incremental_cset_building() { _inc_cset_build_state = Inactive; } |
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744 |
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745 // Add information about hr to the aggregated information for the |
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746 // incrementally built collection set. |
1394
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747 void add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length); |
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748 |
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749 // Update information about hr in the aggregated information for |
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750 // the incrementally built collection set. |
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751 void update_incremental_cset_info(HeapRegion* hr, size_t new_rs_length); |
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752 |
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753 private: |
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754 // Update the incremental cset information when adding a region |
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755 // (should not be called directly). |
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756 void add_region_to_incremental_cset_common(HeapRegion* hr); |
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757 |
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758 public: |
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759 // Add hr to the LHS of the incremental collection set. |
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760 void add_region_to_incremental_cset_lhs(HeapRegion* hr); |
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761 |
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762 // Add hr to the RHS of the incremental collection set. |
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763 void add_region_to_incremental_cset_rhs(HeapRegion* hr); |
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764 |
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765 #ifndef PRODUCT |
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766 void print_collection_set(HeapRegion* list_head, outputStream* st); |
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767 #endif // !PRODUCT |
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768 |
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769 bool initiate_conc_mark_if_possible() { return _initiate_conc_mark_if_possible; } |
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770 void set_initiate_conc_mark_if_possible() { _initiate_conc_mark_if_possible = true; } |
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771 void clear_initiate_conc_mark_if_possible() { _initiate_conc_mark_if_possible = false; } |
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772 |
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773 bool during_initial_mark_pause() { return _during_initial_mark_pause; } |
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774 void set_during_initial_mark_pause() { _during_initial_mark_pause = true; } |
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775 void clear_during_initial_mark_pause(){ _during_initial_mark_pause = false; } |
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776 |
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777 // This sets the initiate_conc_mark_if_possible() flag to start a |
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778 // new cycle, as long as we are not already in one. It's best if it |
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779 // is called during a safepoint when the test whether a cycle is in |
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780 // progress or not is stable. |
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781 bool force_initial_mark_if_outside_cycle(GCCause::Cause gc_cause); |
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782 |
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783 // This is called at the very beginning of an evacuation pause (it |
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784 // has to be the first thing that the pause does). If |
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785 // initiate_conc_mark_if_possible() is true, and the concurrent |
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786 // marking thread has completed its work during the previous cycle, |
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787 // it will set during_initial_mark_pause() to so that the pause does |
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788 // the initial-mark work and start a marking cycle. |
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789 void decide_on_conc_mark_initiation(); |
342 | 790 |
791 // If an expansion would be appropriate, because recent GC overhead had | |
792 // exceeded the desired limit, return an amount to expand by. | |
4013 | 793 size_t expansion_amount(); |
342 | 794 |
795 // Print tracing information. | |
796 void print_tracing_info() const; | |
797 | |
798 // Print stats on young survival ratio | |
799 void print_yg_surv_rate_info() const; | |
800 | |
545 | 801 void finished_recalculating_age_indexes(bool is_survivors) { |
802 if (is_survivors) { | |
803 _survivor_surv_rate_group->finished_recalculating_age_indexes(); | |
804 } else { | |
805 _short_lived_surv_rate_group->finished_recalculating_age_indexes(); | |
806 } | |
342 | 807 // do that for any other surv rate groups |
808 } | |
809 | |
1973 | 810 bool is_young_list_full() { |
6010
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811 uint young_list_length = _g1->young_list()->length(); |
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812 uint young_list_target_length = _young_list_target_length; |
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813 return young_list_length >= young_list_target_length; |
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814 } |
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815 |
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816 bool can_expand_young_list() { |
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817 uint young_list_length = _g1->young_list()->length(); |
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818 uint young_list_max_length = _young_list_max_length; |
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819 return young_list_length < young_list_max_length; |
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820 } |
1973 | 821 |
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822 uint young_list_max_length() { |
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823 return _young_list_max_length; |
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824 } |
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825 |
4710 | 826 bool gcs_are_young() { |
827 return _gcs_are_young; | |
342 | 828 } |
4710 | 829 void set_gcs_are_young(bool gcs_are_young) { |
830 _gcs_are_young = gcs_are_young; | |
342 | 831 } |
832 | |
833 bool adaptive_young_list_length() { | |
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834 return _young_gen_sizer->adaptive_young_list_length(); |
342 | 835 } |
836 | |
4013 | 837 private: |
342 | 838 // |
839 // Survivor regions policy. | |
840 // | |
841 | |
842 // Current tenuring threshold, set to 0 if the collector reaches the | |
6818 | 843 // maximum amount of survivors regions. |
844 uint _tenuring_threshold; | |
342 | 845 |
545 | 846 // The limit on the number of regions allocated for survivors. |
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847 uint _max_survivor_regions; |
545 | 848 |
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849 // For reporting purposes. |
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850 size_t _eden_bytes_before_gc; |
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851 size_t _survivor_bytes_before_gc; |
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852 size_t _capacity_before_gc; |
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853 |
6818 | 854 // The amount of survivor regions after a collection. |
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855 uint _recorded_survivor_regions; |
545 | 856 // List of survivor regions. |
857 HeapRegion* _recorded_survivor_head; | |
858 HeapRegion* _recorded_survivor_tail; | |
859 | |
860 ageTable _survivors_age_table; | |
861 | |
342 | 862 public: |
863 | |
864 inline GCAllocPurpose | |
6818 | 865 evacuation_destination(HeapRegion* src_region, uint age, size_t word_sz) { |
342 | 866 if (age < _tenuring_threshold && src_region->is_young()) { |
867 return GCAllocForSurvived; | |
868 } else { | |
869 return GCAllocForTenured; | |
870 } | |
871 } | |
872 | |
873 inline bool track_object_age(GCAllocPurpose purpose) { | |
874 return purpose == GCAllocForSurvived; | |
875 } | |
876 | |
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877 static const uint REGIONS_UNLIMITED = (uint) -1; |
545 | 878 |
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879 uint max_regions(int purpose); |
342 | 880 |
881 // The limit on regions for a particular purpose is reached. | |
882 void note_alloc_region_limit_reached(int purpose) { | |
883 if (purpose == GCAllocForSurvived) { | |
884 _tenuring_threshold = 0; | |
885 } | |
886 } | |
887 | |
888 void note_start_adding_survivor_regions() { | |
889 _survivor_surv_rate_group->start_adding_regions(); | |
890 } | |
891 | |
892 void note_stop_adding_survivor_regions() { | |
893 _survivor_surv_rate_group->stop_adding_regions(); | |
894 } | |
545 | 895 |
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896 void record_survivor_regions(uint regions, |
545 | 897 HeapRegion* head, |
898 HeapRegion* tail) { | |
899 _recorded_survivor_regions = regions; | |
900 _recorded_survivor_head = head; | |
901 _recorded_survivor_tail = tail; | |
902 } | |
903 | |
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904 uint recorded_survivor_regions() { |
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905 return _recorded_survivor_regions; |
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906 } |
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907 |
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908 void record_thread_age_table(ageTable* age_table) { |
545 | 909 _survivors_age_table.merge_par(age_table); |
910 } | |
911 | |
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912 void update_max_gc_locker_expansion(); |
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913 |
545 | 914 // Calculates survivor space parameters. |
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915 void update_survivors_policy(); |
545 | 916 |
342 | 917 }; |
918 | |
919 // This should move to some place more general... | |
920 | |
921 // If we have "n" measurements, and we've kept track of their "sum" and the | |
922 // "sum_of_squares" of the measurements, this returns the variance of the | |
923 // sequence. | |
924 inline double variance(int n, double sum_of_squares, double sum) { | |
925 double n_d = (double)n; | |
926 double avg = sum/n_d; | |
927 return (sum_of_squares - 2.0 * avg * sum + n_d * avg * avg) / n_d; | |
928 } | |
929 | |
1972 | 930 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTORPOLICY_HPP |