Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.hpp @ 20795:ae52ee069062
8062063: Usage of UseHugeTLBFS, UseLargePagesInMetaspace and huge SurvivorAlignmentInBytes cause crashes in CMBitMapClosure::do_bit
Summary: Making sure committed memory is cleared when re-committed, even if using large pages.
Reviewed-by: jwilhelm, tschatzl
author | sjohanss |
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date | Mon, 12 Jan 2015 15:24:29 +0100 |
parents | b840813adfcc |
children | 7848fc12602b |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTORPOLICY_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTORPOLICY_HPP | |
27 | |
28 #include "gc_implementation/g1/collectionSetChooser.hpp" | |
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29 #include "gc_implementation/g1/g1Allocator.hpp" |
1972 | 30 #include "gc_implementation/g1/g1MMUTracker.hpp" |
31 #include "memory/collectorPolicy.hpp" | |
32 | |
342 | 33 // A G1CollectorPolicy makes policy decisions that determine the |
34 // characteristics of the collector. Examples include: | |
35 // * choice of collection set. | |
36 // * when to collect. | |
37 | |
38 class HeapRegion; | |
39 class CollectionSetChooser; | |
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40 class G1GCPhaseTimes; |
342 | 41 |
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42 // TraceGen0Time collects data on _both_ young and mixed evacuation pauses |
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43 // (the latter may contain non-young regions - i.e. regions that are |
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44 // technically in Gen1) while TraceGen1Time collects data about full GCs. |
6197 | 45 class TraceGen0TimeData : public CHeapObj<mtGC> { |
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46 private: |
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47 unsigned _young_pause_num; |
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48 unsigned _mixed_pause_num; |
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49 |
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50 NumberSeq _all_stop_world_times_ms; |
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51 NumberSeq _all_yield_times_ms; |
342 | 52 |
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53 NumberSeq _total; |
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54 NumberSeq _other; |
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55 NumberSeq _root_region_scan_wait; |
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56 NumberSeq _parallel; |
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57 NumberSeq _ext_root_scan; |
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58 NumberSeq _satb_filtering; |
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59 NumberSeq _update_rs; |
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60 NumberSeq _scan_rs; |
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61 NumberSeq _obj_copy; |
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62 NumberSeq _termination; |
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63 NumberSeq _parallel_other; |
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64 NumberSeq _clear_ct; |
342 | 65 |
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66 void print_summary(const char* str, const NumberSeq* seq) const; |
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67 void print_summary_sd(const char* str, const NumberSeq* seq) const; |
342 | 68 |
69 public: | |
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70 TraceGen0TimeData() : _young_pause_num(0), _mixed_pause_num(0) {}; |
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71 void record_start_collection(double time_to_stop_the_world_ms); |
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72 void record_yield_time(double yield_time_ms); |
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73 void record_end_collection(double pause_time_ms, G1GCPhaseTimes* phase_times); |
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74 void increment_young_collection_count(); |
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75 void increment_mixed_collection_count(); |
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76 void print() const; |
342 | 77 }; |
78 | |
6197 | 79 class TraceGen1TimeData : public CHeapObj<mtGC> { |
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80 private: |
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81 NumberSeq _all_full_gc_times; |
342 | 82 |
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83 public: |
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84 void record_full_collection(double full_gc_time_ms); |
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85 void print() const; |
342 | 86 }; |
87 | |
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88 // There are three command line options related to the young gen size: |
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89 // NewSize, MaxNewSize and NewRatio (There is also -Xmn, but that is |
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90 // just a short form for NewSize==MaxNewSize). G1 will use its internal |
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91 // heuristics to calculate the actual young gen size, so these options |
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92 // basically only limit the range within which G1 can pick a young gen |
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93 // size. Also, these are general options taking byte sizes. G1 will |
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94 // internally work with a number of regions instead. So, some rounding |
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95 // will occur. |
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96 // |
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97 // If nothing related to the the young gen size is set on the command |
7449 | 98 // line we should allow the young gen to be between G1NewSizePercent |
99 // and G1MaxNewSizePercent of the heap size. This means that every time | |
100 // the heap size changes, the limits for the young gen size will be | |
101 // recalculated. | |
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102 // |
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103 // If only -XX:NewSize is set we should use the specified value as the |
7449 | 104 // minimum size for young gen. Still using G1MaxNewSizePercent of the |
105 // heap as maximum. | |
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106 // |
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107 // If only -XX:MaxNewSize is set we should use the specified value as the |
7449 | 108 // maximum size for young gen. Still using G1NewSizePercent of the heap |
109 // as minimum. | |
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110 // |
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111 // If -XX:NewSize and -XX:MaxNewSize are both specified we use these values. |
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112 // No updates when the heap size changes. There is a special case when |
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113 // NewSize==MaxNewSize. This is interpreted as "fixed" and will use a |
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114 // different heuristic for calculating the collection set when we do mixed |
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115 // collection. |
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116 // |
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117 // If only -XX:NewRatio is set we should use the specified ratio of the heap |
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118 // as both min and max. This will be interpreted as "fixed" just like the |
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119 // NewSize==MaxNewSize case above. But we will update the min and max |
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120 // everytime the heap size changes. |
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121 // |
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122 // NewSize and MaxNewSize override NewRatio. So, NewRatio is ignored if it is |
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123 // combined with either NewSize or MaxNewSize. (A warning message is printed.) |
6197 | 124 class G1YoungGenSizer : public CHeapObj<mtGC> { |
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125 private: |
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126 enum SizerKind { |
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127 SizerDefaults, |
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128 SizerNewSizeOnly, |
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129 SizerMaxNewSizeOnly, |
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130 SizerMaxAndNewSize, |
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131 SizerNewRatio |
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132 }; |
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133 SizerKind _sizer_kind; |
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134 uint _min_desired_young_length; |
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135 uint _max_desired_young_length; |
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136 bool _adaptive_size; |
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137 uint calculate_default_min_length(uint new_number_of_heap_regions); |
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138 uint calculate_default_max_length(uint new_number_of_heap_regions); |
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139 |
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140 // Update the given values for minimum and maximum young gen length in regions |
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141 // given the number of heap regions depending on the kind of sizing algorithm. |
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142 void recalculate_min_max_young_length(uint number_of_heap_regions, uint* min_young_length, uint* max_young_length); |
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143 |
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144 public: |
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145 G1YoungGenSizer(); |
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146 // Calculate the maximum length of the young gen given the number of regions |
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147 // depending on the sizing algorithm. |
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148 uint max_young_length(uint number_of_heap_regions); |
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149 |
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150 void heap_size_changed(uint new_number_of_heap_regions); |
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151 uint min_desired_young_length() { |
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152 return _min_desired_young_length; |
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153 } |
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154 uint max_desired_young_length() { |
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155 return _max_desired_young_length; |
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156 } |
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157 bool adaptive_young_list_length() { |
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158 return _adaptive_size; |
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159 } |
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160 }; |
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161 |
342 | 162 class G1CollectorPolicy: public CollectorPolicy { |
4013 | 163 private: |
342 | 164 // either equal to the number of parallel threads, if ParallelGCThreads |
165 // has been set, or 1 otherwise | |
166 int _parallel_gc_threads; | |
167 | |
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168 // The number of GC threads currently active. |
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169 uintx _no_of_gc_threads; |
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170 |
342 | 171 enum SomePrivateConstants { |
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172 NumPrevPausesForHeuristics = 10 |
342 | 173 }; |
174 | |
175 G1MMUTracker* _mmu_tracker; | |
176 | |
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177 void initialize_alignments(); |
342 | 178 void initialize_flags(); |
179 | |
4013 | 180 CollectionSetChooser* _collectionSetChooser; |
342 | 181 |
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182 double _full_collection_start_sec; |
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183 uint _cur_collection_pause_used_regions_at_start; |
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184 |
342 | 185 // These exclude marking times. |
186 TruncatedSeq* _recent_gc_times_ms; | |
187 | |
188 TruncatedSeq* _concurrent_mark_remark_times_ms; | |
189 TruncatedSeq* _concurrent_mark_cleanup_times_ms; | |
190 | |
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191 TraceGen0TimeData _trace_gen0_time_data; |
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192 TraceGen1TimeData _trace_gen1_time_data; |
342 | 193 |
194 double _stop_world_start; | |
195 | |
4710 | 196 // indicates whether we are in young or mixed GC mode |
197 bool _gcs_are_young; | |
342 | 198 |
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199 uint _young_list_target_length; |
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200 uint _young_list_fixed_length; |
342 | 201 |
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202 // The max number of regions we can extend the eden by while the GC |
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203 // locker is active. This should be >= _young_list_target_length; |
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204 uint _young_list_max_length; |
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205 |
4710 | 206 bool _last_gc_was_young; |
342 | 207 |
208 bool _during_marking; | |
209 bool _in_marking_window; | |
210 bool _in_marking_window_im; | |
211 | |
212 SurvRateGroup* _short_lived_surv_rate_group; | |
213 SurvRateGroup* _survivor_surv_rate_group; | |
214 // add here any more surv rate groups | |
215 | |
1356 | 216 double _gc_overhead_perc; |
217 | |
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218 double _reserve_factor; |
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219 uint _reserve_regions; |
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220 |
342 | 221 bool during_marking() { |
222 return _during_marking; | |
223 } | |
224 | |
225 enum PredictionConstants { | |
226 TruncatedSeqLength = 10 | |
227 }; | |
228 | |
229 TruncatedSeq* _alloc_rate_ms_seq; | |
230 double _prev_collection_pause_end_ms; | |
231 | |
232 TruncatedSeq* _rs_length_diff_seq; | |
233 TruncatedSeq* _cost_per_card_ms_seq; | |
4710 | 234 TruncatedSeq* _young_cards_per_entry_ratio_seq; |
235 TruncatedSeq* _mixed_cards_per_entry_ratio_seq; | |
342 | 236 TruncatedSeq* _cost_per_entry_ms_seq; |
4710 | 237 TruncatedSeq* _mixed_cost_per_entry_ms_seq; |
342 | 238 TruncatedSeq* _cost_per_byte_ms_seq; |
239 TruncatedSeq* _constant_other_time_ms_seq; | |
240 TruncatedSeq* _young_other_cost_per_region_ms_seq; | |
241 TruncatedSeq* _non_young_other_cost_per_region_ms_seq; | |
242 | |
243 TruncatedSeq* _pending_cards_seq; | |
244 TruncatedSeq* _rs_lengths_seq; | |
245 | |
246 TruncatedSeq* _cost_per_byte_ms_during_cm_seq; | |
247 | |
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248 G1YoungGenSizer* _young_gen_sizer; |
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249 |
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250 uint _eden_cset_region_length; |
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251 uint _survivor_cset_region_length; |
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252 uint _old_cset_region_length; |
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253 |
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254 void init_cset_region_lengths(uint eden_cset_region_length, |
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255 uint survivor_cset_region_length); |
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256 |
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257 uint eden_cset_region_length() { return _eden_cset_region_length; } |
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258 uint survivor_cset_region_length() { return _survivor_cset_region_length; } |
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259 uint old_cset_region_length() { return _old_cset_region_length; } |
342 | 260 |
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261 uint _free_regions_at_end_of_collection; |
342 | 262 |
263 size_t _recorded_rs_lengths; | |
264 size_t _max_rs_lengths; | |
265 double _sigma; | |
266 | |
267 size_t _rs_lengths_prediction; | |
268 | |
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269 double sigma() { return _sigma; } |
342 | 270 |
271 // A function that prevents us putting too much stock in small sample | |
272 // sets. Returns a number between 2.0 and 1.0, depending on the number | |
273 // of samples. 5 or more samples yields one; fewer scales linearly from | |
274 // 2.0 at 1 sample to 1.0 at 5. | |
275 double confidence_factor(int samples) { | |
276 if (samples > 4) return 1.0; | |
277 else return 1.0 + sigma() * ((double)(5 - samples))/2.0; | |
278 } | |
279 | |
280 double get_new_neg_prediction(TruncatedSeq* seq) { | |
281 return seq->davg() - sigma() * seq->dsd(); | |
282 } | |
283 | |
284 #ifndef PRODUCT | |
285 bool verify_young_ages(HeapRegion* head, SurvRateGroup *surv_rate_group); | |
286 #endif // PRODUCT | |
287 | |
1111 | 288 void adjust_concurrent_refinement(double update_rs_time, |
289 double update_rs_processed_buffers, | |
290 double goal_ms); | |
291 | |
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292 uintx no_of_gc_threads() { return _no_of_gc_threads; } |
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293 void set_no_of_gc_threads(uintx v) { _no_of_gc_threads = v; } |
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294 |
342 | 295 double _pause_time_target_ms; |
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296 |
342 | 297 size_t _pending_cards; |
298 | |
299 public: | |
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300 // Accessors |
342 | 301 |
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302 void set_region_eden(HeapRegion* hr, int young_index_in_cset) { |
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303 hr->set_eden(); |
342 | 304 hr->install_surv_rate_group(_short_lived_surv_rate_group); |
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305 hr->set_young_index_in_cset(young_index_in_cset); |
342 | 306 } |
307 | |
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308 void set_region_survivor(HeapRegion* hr, int young_index_in_cset) { |
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309 assert(hr->is_survivor(), "pre-condition"); |
342 | 310 hr->install_surv_rate_group(_survivor_surv_rate_group); |
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311 hr->set_young_index_in_cset(young_index_in_cset); |
342 | 312 } |
313 | |
314 #ifndef PRODUCT | |
315 bool verify_young_ages(); | |
316 #endif // PRODUCT | |
317 | |
318 double get_new_prediction(TruncatedSeq* seq) { | |
319 return MAX2(seq->davg() + sigma() * seq->dsd(), | |
320 seq->davg() * confidence_factor(seq->num())); | |
321 } | |
322 | |
323 void record_max_rs_lengths(size_t rs_lengths) { | |
324 _max_rs_lengths = rs_lengths; | |
325 } | |
326 | |
327 size_t predict_rs_length_diff() { | |
328 return (size_t) get_new_prediction(_rs_length_diff_seq); | |
329 } | |
330 | |
331 double predict_alloc_rate_ms() { | |
332 return get_new_prediction(_alloc_rate_ms_seq); | |
333 } | |
334 | |
335 double predict_cost_per_card_ms() { | |
336 return get_new_prediction(_cost_per_card_ms_seq); | |
337 } | |
338 | |
339 double predict_rs_update_time_ms(size_t pending_cards) { | |
340 return (double) pending_cards * predict_cost_per_card_ms(); | |
341 } | |
342 | |
4710 | 343 double predict_young_cards_per_entry_ratio() { |
344 return get_new_prediction(_young_cards_per_entry_ratio_seq); | |
342 | 345 } |
346 | |
4710 | 347 double predict_mixed_cards_per_entry_ratio() { |
348 if (_mixed_cards_per_entry_ratio_seq->num() < 2) { | |
349 return predict_young_cards_per_entry_ratio(); | |
350 } else { | |
351 return get_new_prediction(_mixed_cards_per_entry_ratio_seq); | |
352 } | |
342 | 353 } |
354 | |
355 size_t predict_young_card_num(size_t rs_length) { | |
356 return (size_t) ((double) rs_length * | |
4710 | 357 predict_young_cards_per_entry_ratio()); |
342 | 358 } |
359 | |
360 size_t predict_non_young_card_num(size_t rs_length) { | |
361 return (size_t) ((double) rs_length * | |
4710 | 362 predict_mixed_cards_per_entry_ratio()); |
342 | 363 } |
364 | |
365 double predict_rs_scan_time_ms(size_t card_num) { | |
4710 | 366 if (gcs_are_young()) { |
342 | 367 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); |
4710 | 368 } else { |
369 return predict_mixed_rs_scan_time_ms(card_num); | |
370 } | |
342 | 371 } |
372 | |
4710 | 373 double predict_mixed_rs_scan_time_ms(size_t card_num) { |
374 if (_mixed_cost_per_entry_ms_seq->num() < 3) { | |
342 | 375 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); |
4710 | 376 } else { |
377 return (double) (card_num * | |
378 get_new_prediction(_mixed_cost_per_entry_ms_seq)); | |
379 } | |
342 | 380 } |
381 | |
382 double predict_object_copy_time_ms_during_cm(size_t bytes_to_copy) { | |
4710 | 383 if (_cost_per_byte_ms_during_cm_seq->num() < 3) { |
384 return (1.1 * (double) bytes_to_copy) * | |
385 get_new_prediction(_cost_per_byte_ms_seq); | |
386 } else { | |
342 | 387 return (double) bytes_to_copy * |
4710 | 388 get_new_prediction(_cost_per_byte_ms_during_cm_seq); |
389 } | |
342 | 390 } |
391 | |
392 double predict_object_copy_time_ms(size_t bytes_to_copy) { | |
4710 | 393 if (_in_marking_window && !_in_marking_window_im) { |
342 | 394 return predict_object_copy_time_ms_during_cm(bytes_to_copy); |
4710 | 395 } else { |
342 | 396 return (double) bytes_to_copy * |
4710 | 397 get_new_prediction(_cost_per_byte_ms_seq); |
398 } | |
342 | 399 } |
400 | |
401 double predict_constant_other_time_ms() { | |
402 return get_new_prediction(_constant_other_time_ms_seq); | |
403 } | |
404 | |
405 double predict_young_other_time_ms(size_t young_num) { | |
4710 | 406 return (double) young_num * |
407 get_new_prediction(_young_other_cost_per_region_ms_seq); | |
342 | 408 } |
409 | |
410 double predict_non_young_other_time_ms(size_t non_young_num) { | |
4710 | 411 return (double) non_young_num * |
412 get_new_prediction(_non_young_other_cost_per_region_ms_seq); | |
342 | 413 } |
414 | |
415 double predict_base_elapsed_time_ms(size_t pending_cards); | |
416 double predict_base_elapsed_time_ms(size_t pending_cards, | |
417 size_t scanned_cards); | |
418 size_t predict_bytes_to_copy(HeapRegion* hr); | |
6611 | 419 double predict_region_elapsed_time_ms(HeapRegion* hr, bool for_young_gc); |
342 | 420 |
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421 void set_recorded_rs_lengths(size_t rs_lengths); |
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422 |
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423 uint cset_region_length() { return young_cset_region_length() + |
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424 old_cset_region_length(); } |
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425 uint young_cset_region_length() { return eden_cset_region_length() + |
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426 survivor_cset_region_length(); } |
342 | 427 |
545 | 428 double predict_survivor_regions_evac_time(); |
429 | |
342 | 430 void cset_regions_freed() { |
4710 | 431 bool propagate = _last_gc_was_young && !_in_marking_window; |
342 | 432 _short_lived_surv_rate_group->all_surviving_words_recorded(propagate); |
433 _survivor_surv_rate_group->all_surviving_words_recorded(propagate); | |
434 // also call it on any more surv rate groups | |
435 } | |
436 | |
437 G1MMUTracker* mmu_tracker() { | |
438 return _mmu_tracker; | |
439 } | |
440 | |
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441 double max_pause_time_ms() { |
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442 return _mmu_tracker->max_gc_time() * 1000.0; |
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443 } |
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444 |
342 | 445 double predict_remark_time_ms() { |
446 return get_new_prediction(_concurrent_mark_remark_times_ms); | |
447 } | |
448 | |
449 double predict_cleanup_time_ms() { | |
450 return get_new_prediction(_concurrent_mark_cleanup_times_ms); | |
451 } | |
452 | |
453 // Returns an estimate of the survival rate of the region at yg-age | |
454 // "yg_age". | |
545 | 455 double predict_yg_surv_rate(int age, SurvRateGroup* surv_rate_group) { |
456 TruncatedSeq* seq = surv_rate_group->get_seq(age); | |
342 | 457 if (seq->num() == 0) |
458 gclog_or_tty->print("BARF! age is %d", age); | |
459 guarantee( seq->num() > 0, "invariant" ); | |
460 double pred = get_new_prediction(seq); | |
461 if (pred > 1.0) | |
462 pred = 1.0; | |
463 return pred; | |
464 } | |
465 | |
545 | 466 double predict_yg_surv_rate(int age) { |
467 return predict_yg_surv_rate(age, _short_lived_surv_rate_group); | |
468 } | |
469 | |
342 | 470 double accum_yg_surv_rate_pred(int age) { |
471 return _short_lived_surv_rate_group->accum_surv_rate_pred(age); | |
472 } | |
473 | |
4013 | 474 private: |
342 | 475 // Statistics kept per GC stoppage, pause or full. |
476 TruncatedSeq* _recent_prev_end_times_for_all_gcs_sec; | |
477 | |
478 // Add a new GC of the given duration and end time to the record. | |
479 void update_recent_gc_times(double end_time_sec, double elapsed_ms); | |
480 | |
481 // The head of the list (via "next_in_collection_set()") representing the | |
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482 // current collection set. Set from the incrementally built collection |
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483 // set at the start of the pause. |
342 | 484 HeapRegion* _collection_set; |
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485 |
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486 // The number of bytes in the collection set before the pause. Set from |
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487 // the incrementally built collection set at the start of an evacuation |
6611 | 488 // pause, and incremented in finalize_cset() when adding old regions |
489 // (if any) to the collection set. | |
342 | 490 size_t _collection_set_bytes_used_before; |
491 | |
6611 | 492 // The number of bytes copied during the GC. |
493 size_t _bytes_copied_during_gc; | |
494 | |
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495 // The associated information that is maintained while the incremental |
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496 // collection set is being built with young regions. Used to populate |
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497 // the recorded info for the evacuation pause. |
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498 |
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499 enum CSetBuildType { |
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500 Active, // We are actively building the collection set |
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501 Inactive // We are not actively building the collection set |
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502 }; |
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503 |
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504 CSetBuildType _inc_cset_build_state; |
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505 |
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506 // The head of the incrementally built collection set. |
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507 HeapRegion* _inc_cset_head; |
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508 |
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509 // The tail of the incrementally built collection set. |
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510 HeapRegion* _inc_cset_tail; |
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511 |
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512 // The number of bytes in the incrementally built collection set. |
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513 // Used to set _collection_set_bytes_used_before at the start of |
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514 // an evacuation pause. |
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515 size_t _inc_cset_bytes_used_before; |
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516 |
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517 // Used to record the highest end of heap region in collection set |
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518 HeapWord* _inc_cset_max_finger; |
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519 |
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520 // The RSet lengths recorded for regions in the CSet. It is updated |
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521 // by the thread that adds a new region to the CSet. We assume that |
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522 // only one thread can be allocating a new CSet region (currently, |
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523 // it does so after taking the Heap_lock) hence no need to |
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524 // synchronize updates to this field. |
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525 size_t _inc_cset_recorded_rs_lengths; |
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526 |
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527 // A concurrent refinement thread periodcially samples the young |
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528 // region RSets and needs to update _inc_cset_recorded_rs_lengths as |
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529 // the RSets grow. Instead of having to syncronize updates to that |
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530 // field we accumulate them in this field and add it to |
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531 // _inc_cset_recorded_rs_lengths_diffs at the start of a GC. |
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532 ssize_t _inc_cset_recorded_rs_lengths_diffs; |
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533 |
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534 // The predicted elapsed time it will take to collect the regions in |
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535 // the CSet. This is updated by the thread that adds a new region to |
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536 // the CSet. See the comment for _inc_cset_recorded_rs_lengths about |
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537 // MT-safety assumptions. |
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538 double _inc_cset_predicted_elapsed_time_ms; |
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539 |
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540 // See the comment for _inc_cset_recorded_rs_lengths_diffs. |
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541 double _inc_cset_predicted_elapsed_time_ms_diffs; |
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542 |
342 | 543 // Stash a pointer to the g1 heap. |
544 G1CollectedHeap* _g1; | |
545 | |
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546 G1GCPhaseTimes* _phase_times; |
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547 |
342 | 548 // The ratio of gc time to elapsed time, computed over recent pauses. |
549 double _recent_avg_pause_time_ratio; | |
550 | |
551 double recent_avg_pause_time_ratio() { | |
552 return _recent_avg_pause_time_ratio; | |
553 } | |
554 | |
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555 // At the end of a pause we check the heap occupancy and we decide |
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556 // whether we will start a marking cycle during the next pause. If |
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557 // we decide that we want to do that, we will set this parameter to |
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558 // true. So, this parameter will stay true between the end of a |
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559 // pause and the beginning of a subsequent pause (not necessarily |
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560 // the next one, see the comments on the next field) when we decide |
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561 // that we will indeed start a marking cycle and do the initial-mark |
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562 // work. |
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563 volatile bool _initiate_conc_mark_if_possible; |
342 | 564 |
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565 // If initiate_conc_mark_if_possible() is set at the beginning of a |
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566 // pause, it is a suggestion that the pause should start a marking |
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567 // cycle by doing the initial-mark work. However, it is possible |
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568 // that the concurrent marking thread is still finishing up the |
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569 // previous marking cycle (e.g., clearing the next marking |
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570 // bitmap). If that is the case we cannot start a new cycle and |
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571 // we'll have to wait for the concurrent marking thread to finish |
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572 // what it is doing. In this case we will postpone the marking cycle |
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573 // initiation decision for the next pause. When we eventually decide |
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574 // to start a cycle, we will set _during_initial_mark_pause which |
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575 // will stay true until the end of the initial-mark pause and it's |
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576 // the condition that indicates that a pause is doing the |
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577 // initial-mark work. |
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578 volatile bool _during_initial_mark_pause; |
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579 |
4710 | 580 bool _last_young_gc; |
342 | 581 |
582 // This set of variables tracks the collector efficiency, in order to | |
583 // determine whether we should initiate a new marking. | |
584 double _cur_mark_stop_world_time_ms; | |
585 double _mark_remark_start_sec; | |
586 double _mark_cleanup_start_sec; | |
587 | |
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588 // Update the young list target length either by setting it to the |
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589 // desired fixed value or by calculating it using G1's pause |
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590 // prediction model. If no rs_lengths parameter is passed, predict |
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591 // the RS lengths using the prediction model, otherwise use the |
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592 // given rs_lengths as the prediction. |
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593 void update_young_list_target_length(size_t rs_lengths = (size_t) -1); |
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594 |
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595 // Calculate and return the minimum desired young list target |
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596 // length. This is the minimum desired young list length according |
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597 // to the user's inputs. |
6010
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598 uint calculate_young_list_desired_min_length(uint base_min_length); |
3919
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599 |
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600 // Calculate and return the maximum desired young list target |
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601 // length. This is the maximum desired young list length according |
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602 // to the user's inputs. |
6010
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603 uint calculate_young_list_desired_max_length(); |
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604 |
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605 // Calculate and return the maximum young list target length that |
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606 // can fit into the pause time goal. The parameters are: rs_lengths |
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607 // represent the prediction of how large the young RSet lengths will |
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608 // be, base_min_length is the alreay existing number of regions in |
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609 // the young list, min_length and max_length are the desired min and |
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610 // max young list length according to the user's inputs. |
6010
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611 uint calculate_young_list_target_length(size_t rs_lengths, |
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612 uint base_min_length, |
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613 uint desired_min_length, |
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614 uint desired_max_length); |
3919
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615 |
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616 // Check whether a given young length (young_length) fits into the |
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617 // given target pause time and whether the prediction for the amount |
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618 // of objects to be copied for the given length will fit into the |
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619 // given free space (expressed by base_free_regions). It is used by |
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620 // calculate_young_list_target_length(). |
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621 bool predict_will_fit(uint young_length, double base_time_ms, |
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622 uint base_free_regions, double target_pause_time_ms); |
342 | 623 |
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624 // Calculate the minimum number of old regions we'll add to the CSet |
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625 // during a mixed GC. |
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626 uint calc_min_old_cset_length(); |
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627 |
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628 // Calculate the maximum number of old regions we'll add to the CSet |
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629 // during a mixed GC. |
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630 uint calc_max_old_cset_length(); |
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631 |
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632 // Returns the given amount of uncollected reclaimable space |
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633 // as a percentage of the current heap capacity. |
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634 double reclaimable_bytes_perc(size_t reclaimable_bytes); |
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635 |
342 | 636 public: |
637 | |
638 G1CollectorPolicy(); | |
639 | |
640 virtual G1CollectorPolicy* as_g1_policy() { return this; } | |
641 | |
642 virtual CollectorPolicy::Name kind() { | |
643 return CollectorPolicy::G1CollectorPolicyKind; | |
644 } | |
645 | |
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646 G1GCPhaseTimes* phase_times() const { return _phase_times; } |
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647 |
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648 // Check the current value of the young list RSet lengths and |
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649 // compare it against the last prediction. If the current value is |
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650 // higher, recalculate the young list target length prediction. |
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651 void revise_young_list_target_length_if_necessary(); |
342 | 652 |
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653 // This should be called after the heap is resized. |
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654 void record_new_heap_size(uint new_number_of_regions); |
3919
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655 |
4013 | 656 void init(); |
342 | 657 |
545 | 658 // Create jstat counters for the policy. |
659 virtual void initialize_gc_policy_counters(); | |
660 | |
342 | 661 virtual HeapWord* mem_allocate_work(size_t size, |
662 bool is_tlab, | |
663 bool* gc_overhead_limit_was_exceeded); | |
664 | |
665 // This method controls how a collector handles one or more | |
666 // of its generations being fully allocated. | |
667 virtual HeapWord* satisfy_failed_allocation(size_t size, | |
668 bool is_tlab); | |
669 | |
670 BarrierSet::Name barrier_set_name() { return BarrierSet::G1SATBCTLogging; } | |
671 | |
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672 bool need_to_start_conc_mark(const char* source, size_t alloc_word_size = 0); |
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673 |
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674 // Record the start and end of an evacuation pause. |
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675 void record_collection_pause_start(double start_time_sec); |
10405 | 676 void record_collection_pause_end(double pause_time_ms, EvacuationInfo& evacuation_info); |
342 | 677 |
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678 // Record the start and end of a full collection. |
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679 void record_full_collection_start(); |
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680 void record_full_collection_end(); |
342 | 681 |
682 // Must currently be called while the world is stopped. | |
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683 void record_concurrent_mark_init_end(double mark_init_elapsed_time_ms); |
342 | 684 |
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685 // Record start and end of remark. |
4013 | 686 void record_concurrent_mark_remark_start(); |
687 void record_concurrent_mark_remark_end(); | |
342 | 688 |
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689 // Record start, end, and completion of cleanup. |
4013 | 690 void record_concurrent_mark_cleanup_start(); |
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691 void record_concurrent_mark_cleanup_end(int no_of_gc_threads); |
4013 | 692 void record_concurrent_mark_cleanup_completed(); |
342 | 693 |
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694 // Records the information about the heap size for reporting in |
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695 // print_detailed_heap_transition |
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696 void record_heap_size_info_at_start(bool full); |
342 | 697 |
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698 // Print heap sizing transition (with less and more detail). |
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699 void print_heap_transition(); |
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700 void print_detailed_heap_transition(bool full = false); |
342 | 701 |
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702 void record_stop_world_start(); |
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703 void record_concurrent_pause(); |
342 | 704 |
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705 // Record how much space we copied during a GC. This is typically |
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706 // called when a GC alloc region is being retired. |
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707 void record_bytes_copied_during_gc(size_t bytes) { |
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708 _bytes_copied_during_gc += bytes; |
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709 } |
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710 |
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711 // The amount of space we copied during a GC. |
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712 size_t bytes_copied_during_gc() { |
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713 return _bytes_copied_during_gc; |
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714 } |
342 | 715 |
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716 // Determine whether there are candidate regions so that the |
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717 // next GC should be mixed. The two action strings are used |
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718 // in the ergo output when the method returns true or false. |
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719 bool next_gc_should_be_mixed(const char* true_action_str, |
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720 const char* false_action_str); |
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721 |
342 | 722 // Choose a new collection set. Marks the chosen regions as being |
723 // "in_collection_set", and links them together. The head and number of | |
724 // the collection set are available via access methods. | |
10405 | 725 void finalize_cset(double target_pause_time_ms, EvacuationInfo& evacuation_info); |
342 | 726 |
727 // The head of the list (via "next_in_collection_set()") representing the | |
728 // current collection set. | |
729 HeapRegion* collection_set() { return _collection_set; } | |
730 | |
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731 void clear_collection_set() { _collection_set = NULL; } |
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732 |
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733 // Add old region "hr" to the CSet. |
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734 void add_old_region_to_cset(HeapRegion* hr); |
342 | 735 |
1394
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736 // Incremental CSet Support |
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737 |
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738 // The head of the incrementally built collection set. |
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739 HeapRegion* inc_cset_head() { return _inc_cset_head; } |
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740 |
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741 // The tail of the incrementally built collection set. |
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742 HeapRegion* inc_set_tail() { return _inc_cset_tail; } |
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743 |
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744 // Initialize incremental collection set info. |
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745 void start_incremental_cset_building(); |
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746 |
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747 // Perform any final calculations on the incremental CSet fields |
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748 // before we can use them. |
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749 void finalize_incremental_cset_building(); |
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750 |
1394
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751 void clear_incremental_cset() { |
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752 _inc_cset_head = NULL; |
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753 _inc_cset_tail = NULL; |
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754 } |
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|
755 |
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756 // Stop adding regions to the incremental collection set |
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757 void stop_incremental_cset_building() { _inc_cset_build_state = Inactive; } |
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758 |
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759 // Add information about hr to the aggregated information for the |
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760 // incrementally built collection set. |
1394
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761 void add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length); |
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762 |
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763 // Update information about hr in the aggregated information for |
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764 // the incrementally built collection set. |
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765 void update_incremental_cset_info(HeapRegion* hr, size_t new_rs_length); |
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766 |
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767 private: |
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768 // Update the incremental cset information when adding a region |
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769 // (should not be called directly). |
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770 void add_region_to_incremental_cset_common(HeapRegion* hr); |
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771 |
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772 public: |
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773 // Add hr to the LHS of the incremental collection set. |
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774 void add_region_to_incremental_cset_lhs(HeapRegion* hr); |
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775 |
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776 // Add hr to the RHS of the incremental collection set. |
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777 void add_region_to_incremental_cset_rhs(HeapRegion* hr); |
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778 |
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779 #ifndef PRODUCT |
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780 void print_collection_set(HeapRegion* list_head, outputStream* st); |
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781 #endif // !PRODUCT |
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782 |
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783 bool initiate_conc_mark_if_possible() { return _initiate_conc_mark_if_possible; } |
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784 void set_initiate_conc_mark_if_possible() { _initiate_conc_mark_if_possible = true; } |
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785 void clear_initiate_conc_mark_if_possible() { _initiate_conc_mark_if_possible = false; } |
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786 |
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787 bool during_initial_mark_pause() { return _during_initial_mark_pause; } |
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788 void set_during_initial_mark_pause() { _during_initial_mark_pause = true; } |
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789 void clear_during_initial_mark_pause(){ _during_initial_mark_pause = false; } |
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790 |
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791 // This sets the initiate_conc_mark_if_possible() flag to start a |
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792 // new cycle, as long as we are not already in one. It's best if it |
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793 // is called during a safepoint when the test whether a cycle is in |
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794 // progress or not is stable. |
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795 bool force_initial_mark_if_outside_cycle(GCCause::Cause gc_cause); |
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796 |
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797 // This is called at the very beginning of an evacuation pause (it |
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798 // has to be the first thing that the pause does). If |
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799 // initiate_conc_mark_if_possible() is true, and the concurrent |
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800 // marking thread has completed its work during the previous cycle, |
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801 // it will set during_initial_mark_pause() to so that the pause does |
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802 // the initial-mark work and start a marking cycle. |
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803 void decide_on_conc_mark_initiation(); |
342 | 804 |
805 // If an expansion would be appropriate, because recent GC overhead had | |
806 // exceeded the desired limit, return an amount to expand by. | |
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807 virtual size_t expansion_amount(); |
342 | 808 |
809 // Print tracing information. | |
810 void print_tracing_info() const; | |
811 | |
812 // Print stats on young survival ratio | |
813 void print_yg_surv_rate_info() const; | |
814 | |
545 | 815 void finished_recalculating_age_indexes(bool is_survivors) { |
816 if (is_survivors) { | |
817 _survivor_surv_rate_group->finished_recalculating_age_indexes(); | |
818 } else { | |
819 _short_lived_surv_rate_group->finished_recalculating_age_indexes(); | |
820 } | |
342 | 821 // do that for any other surv rate groups |
822 } | |
823 | |
17727 | 824 size_t young_list_target_length() const { return _young_list_target_length; } |
825 | |
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826 bool is_young_list_full(); |
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827 |
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828 bool can_expand_young_list(); |
1973 | 829 |
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830 uint young_list_max_length() { |
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831 return _young_list_max_length; |
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832 } |
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833 |
4710 | 834 bool gcs_are_young() { |
835 return _gcs_are_young; | |
342 | 836 } |
4710 | 837 void set_gcs_are_young(bool gcs_are_young) { |
838 _gcs_are_young = gcs_are_young; | |
342 | 839 } |
840 | |
841 bool adaptive_young_list_length() { | |
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842 return _young_gen_sizer->adaptive_young_list_length(); |
342 | 843 } |
844 | |
4013 | 845 private: |
342 | 846 // |
847 // Survivor regions policy. | |
848 // | |
849 | |
850 // Current tenuring threshold, set to 0 if the collector reaches the | |
6818 | 851 // maximum amount of survivors regions. |
852 uint _tenuring_threshold; | |
342 | 853 |
545 | 854 // The limit on the number of regions allocated for survivors. |
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855 uint _max_survivor_regions; |
545 | 856 |
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857 // For reporting purposes. |
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858 // The value of _heap_bytes_before_gc is also used to calculate |
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859 // the cost of copying. |
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860 |
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861 size_t _eden_used_bytes_before_gc; // Eden occupancy before GC |
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862 size_t _survivor_used_bytes_before_gc; // Survivor occupancy before GC |
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863 size_t _heap_used_bytes_before_gc; // Heap occupancy before GC |
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864 size_t _metaspace_used_bytes_before_gc; // Metaspace occupancy before GC |
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865 |
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866 size_t _eden_capacity_bytes_before_gc; // Eden capacity before GC |
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867 size_t _heap_capacity_bytes_before_gc; // Heap capacity before GC |
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868 |
6818 | 869 // The amount of survivor regions after a collection. |
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870 uint _recorded_survivor_regions; |
545 | 871 // List of survivor regions. |
872 HeapRegion* _recorded_survivor_head; | |
873 HeapRegion* _recorded_survivor_tail; | |
874 | |
875 ageTable _survivors_age_table; | |
876 | |
342 | 877 public: |
10405 | 878 uint tenuring_threshold() const { return _tenuring_threshold; } |
342 | 879 |
880 inline GCAllocPurpose | |
6818 | 881 evacuation_destination(HeapRegion* src_region, uint age, size_t word_sz) { |
342 | 882 if (age < _tenuring_threshold && src_region->is_young()) { |
883 return GCAllocForSurvived; | |
884 } else { | |
885 return GCAllocForTenured; | |
886 } | |
887 } | |
888 | |
889 inline bool track_object_age(GCAllocPurpose purpose) { | |
890 return purpose == GCAllocForSurvived; | |
891 } | |
892 | |
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893 static const uint REGIONS_UNLIMITED = (uint) -1; |
545 | 894 |
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895 uint max_regions(int purpose); |
342 | 896 |
897 // The limit on regions for a particular purpose is reached. | |
898 void note_alloc_region_limit_reached(int purpose) { | |
899 if (purpose == GCAllocForSurvived) { | |
900 _tenuring_threshold = 0; | |
901 } | |
902 } | |
903 | |
904 void note_start_adding_survivor_regions() { | |
905 _survivor_surv_rate_group->start_adding_regions(); | |
906 } | |
907 | |
908 void note_stop_adding_survivor_regions() { | |
909 _survivor_surv_rate_group->stop_adding_regions(); | |
910 } | |
545 | 911 |
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912 void record_survivor_regions(uint regions, |
545 | 913 HeapRegion* head, |
914 HeapRegion* tail) { | |
915 _recorded_survivor_regions = regions; | |
916 _recorded_survivor_head = head; | |
917 _recorded_survivor_tail = tail; | |
918 } | |
919 | |
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920 uint recorded_survivor_regions() { |
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921 return _recorded_survivor_regions; |
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922 } |
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923 |
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924 void record_thread_age_table(ageTable* age_table) { |
545 | 925 _survivors_age_table.merge_par(age_table); |
926 } | |
927 | |
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928 void update_max_gc_locker_expansion(); |
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929 |
545 | 930 // Calculates survivor space parameters. |
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931 void update_survivors_policy(); |
545 | 932 |
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933 virtual void post_heap_initialize(); |
342 | 934 }; |
935 | |
936 // This should move to some place more general... | |
937 | |
938 // If we have "n" measurements, and we've kept track of their "sum" and the | |
939 // "sum_of_squares" of the measurements, this returns the variance of the | |
940 // sequence. | |
941 inline double variance(int n, double sum_of_squares, double sum) { | |
942 double n_d = (double)n; | |
943 double avg = sum/n_d; | |
944 return (sum_of_squares - 2.0 * avg * sum + n_d * avg * avg) / n_d; | |
945 } | |
946 | |
1972 | 947 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTORPOLICY_HPP |