Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.hpp @ 6220:3a431b605145
Merge
| author | jmasa |
|---|---|
| date | Mon, 16 Jul 2012 13:00:26 -0700 |
| parents | d2a62e0f25eb 922993931b3d |
| children | 7383557659bd |
| rev | line source |
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| 342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTORPOLICY_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTORPOLICY_HPP | |
| 27 | |
| 28 #include "gc_implementation/g1/collectionSetChooser.hpp" | |
| 29 #include "gc_implementation/g1/g1MMUTracker.hpp" | |
| 30 #include "memory/collectorPolicy.hpp" | |
| 31 | |
| 342 | 32 // A G1CollectorPolicy makes policy decisions that determine the |
| 33 // characteristics of the collector. Examples include: | |
| 34 // * choice of collection set. | |
| 35 // * when to collect. | |
| 36 | |
| 37 class HeapRegion; | |
| 38 class CollectionSetChooser; | |
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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 |
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97 // line we should allow the young gen to be between |
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98 // G1DefaultMinNewGenPercent and G1DefaultMaxNewGenPercent of the |
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99 // heap size. This means that every time the heap size changes the |
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100 // limits for the young gen size will be updated. |
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101 // |
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102 // If only -XX:NewSize is set we should use the specified value as the |
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103 // minimum size for young gen. Still using G1DefaultMaxNewGenPercent |
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104 // of the heap as maximum. |
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105 // |
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106 // If only -XX:MaxNewSize is set we should use the specified value as the |
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107 // maximum size for young gen. Still using G1DefaultMinNewGenPercent |
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108 // of the heap as minimum. |
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109 // |
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110 // If -XX:NewSize and -XX:MaxNewSize are both specified we use these values. |
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111 // No updates when the heap size changes. There is a special case when |
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112 // NewSize==MaxNewSize. This is interpreted as "fixed" and will use a |
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113 // different heuristic for calculating the collection set when we do mixed |
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114 // collection. |
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115 // |
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116 // If only -XX:NewRatio is set we should use the specified ratio of the heap |
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117 // as both min and max. This will be interpreted as "fixed" just like the |
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118 // NewSize==MaxNewSize case above. But we will update the min and max |
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119 // everytime the heap size changes. |
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120 // |
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121 // NewSize and MaxNewSize override NewRatio. So, NewRatio is ignored if it is |
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122 // combined with either NewSize or MaxNewSize. (A warning message is printed.) |
| 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 initialize_perm_generation(PermGen::MarkSweepCompact); | |
| 174 } | |
| 175 | |
| 4013 | 176 CollectionSetChooser* _collectionSetChooser; |
| 342 | 177 |
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178 double _full_collection_start_sec; |
| 342 | 179 size_t _cur_collection_pause_used_at_start_bytes; |
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180 uint _cur_collection_pause_used_regions_at_start; |
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181 |
| 342 | 182 // These exclude marking times. |
| 183 TruncatedSeq* _recent_gc_times_ms; | |
| 184 | |
| 185 TruncatedSeq* _concurrent_mark_remark_times_ms; | |
| 186 TruncatedSeq* _concurrent_mark_cleanup_times_ms; | |
| 187 | |
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188 TraceGen0TimeData _trace_gen0_time_data; |
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189 TraceGen1TimeData _trace_gen1_time_data; |
| 342 | 190 |
| 191 double _stop_world_start; | |
| 192 | |
| 4710 | 193 // indicates whether we are in young or mixed GC mode |
| 194 bool _gcs_are_young; | |
| 342 | 195 |
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196 uint _young_list_target_length; |
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197 uint _young_list_fixed_length; |
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198 size_t _prev_eden_capacity; // used for logging |
| 342 | 199 |
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200 // The max number of regions we can extend the eden by while the GC |
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201 // locker is active. This should be >= _young_list_target_length; |
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202 uint _young_list_max_length; |
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203 |
| 4710 | 204 bool _last_gc_was_young; |
| 342 | 205 |
| 206 bool _during_marking; | |
| 207 bool _in_marking_window; | |
| 208 bool _in_marking_window_im; | |
| 209 | |
| 210 SurvRateGroup* _short_lived_surv_rate_group; | |
| 211 SurvRateGroup* _survivor_surv_rate_group; | |
| 212 // add here any more surv rate groups | |
| 213 | |
| 1356 | 214 double _gc_overhead_perc; |
| 215 | |
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216 double _reserve_factor; |
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217 uint _reserve_regions; |
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218 |
| 342 | 219 bool during_marking() { |
| 220 return _during_marking; | |
| 221 } | |
| 222 | |
| 223 private: | |
| 224 enum PredictionConstants { | |
| 225 TruncatedSeqLength = 10 | |
| 226 }; | |
| 227 | |
| 228 TruncatedSeq* _alloc_rate_ms_seq; | |
| 229 double _prev_collection_pause_end_ms; | |
| 230 | |
| 231 TruncatedSeq* _pending_card_diff_seq; | |
| 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 size_t _max_pending_cards; | |
| 299 | |
| 300 public: | |
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301 // Accessors |
| 342 | 302 |
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303 void set_region_eden(HeapRegion* hr, int young_index_in_cset) { |
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304 hr->set_young(); |
| 342 | 305 hr->install_surv_rate_group(_short_lived_surv_rate_group); |
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306 hr->set_young_index_in_cset(young_index_in_cset); |
| 342 | 307 } |
| 308 | |
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309 void set_region_survivor(HeapRegion* hr, int young_index_in_cset) { |
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310 assert(hr->is_young() && hr->is_survivor(), "pre-condition"); |
| 342 | 311 hr->install_surv_rate_group(_survivor_surv_rate_group); |
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312 hr->set_young_index_in_cset(young_index_in_cset); |
| 342 | 313 } |
| 314 | |
| 315 #ifndef PRODUCT | |
| 316 bool verify_young_ages(); | |
| 317 #endif // PRODUCT | |
| 318 | |
| 319 double get_new_prediction(TruncatedSeq* seq) { | |
| 320 return MAX2(seq->davg() + sigma() * seq->dsd(), | |
| 321 seq->davg() * confidence_factor(seq->num())); | |
| 322 } | |
| 323 | |
| 324 void record_max_rs_lengths(size_t rs_lengths) { | |
| 325 _max_rs_lengths = rs_lengths; | |
| 326 } | |
| 327 | |
| 328 size_t predict_pending_card_diff() { | |
| 329 double prediction = get_new_neg_prediction(_pending_card_diff_seq); | |
| 4710 | 330 if (prediction < 0.00001) { |
| 342 | 331 return 0; |
| 4710 | 332 } else { |
| 342 | 333 return (size_t) prediction; |
| 4710 | 334 } |
| 342 | 335 } |
| 336 | |
| 337 size_t predict_pending_cards() { | |
| 338 size_t max_pending_card_num = _g1->max_pending_card_num(); | |
| 339 size_t diff = predict_pending_card_diff(); | |
| 340 size_t prediction; | |
| 4710 | 341 if (diff > max_pending_card_num) { |
| 342 | 342 prediction = max_pending_card_num; |
| 4710 | 343 } else { |
| 342 | 344 prediction = max_pending_card_num - diff; |
| 4710 | 345 } |
| 342 | 346 |
| 347 return prediction; | |
| 348 } | |
| 349 | |
| 350 size_t predict_rs_length_diff() { | |
| 351 return (size_t) get_new_prediction(_rs_length_diff_seq); | |
| 352 } | |
| 353 | |
| 354 double predict_alloc_rate_ms() { | |
| 355 return get_new_prediction(_alloc_rate_ms_seq); | |
| 356 } | |
| 357 | |
| 358 double predict_cost_per_card_ms() { | |
| 359 return get_new_prediction(_cost_per_card_ms_seq); | |
| 360 } | |
| 361 | |
| 362 double predict_rs_update_time_ms(size_t pending_cards) { | |
| 363 return (double) pending_cards * predict_cost_per_card_ms(); | |
| 364 } | |
| 365 | |
| 4710 | 366 double predict_young_cards_per_entry_ratio() { |
| 367 return get_new_prediction(_young_cards_per_entry_ratio_seq); | |
| 342 | 368 } |
| 369 | |
| 4710 | 370 double predict_mixed_cards_per_entry_ratio() { |
| 371 if (_mixed_cards_per_entry_ratio_seq->num() < 2) { | |
| 372 return predict_young_cards_per_entry_ratio(); | |
| 373 } else { | |
| 374 return get_new_prediction(_mixed_cards_per_entry_ratio_seq); | |
| 375 } | |
| 342 | 376 } |
| 377 | |
| 378 size_t predict_young_card_num(size_t rs_length) { | |
| 379 return (size_t) ((double) rs_length * | |
| 4710 | 380 predict_young_cards_per_entry_ratio()); |
| 342 | 381 } |
| 382 | |
| 383 size_t predict_non_young_card_num(size_t rs_length) { | |
| 384 return (size_t) ((double) rs_length * | |
| 4710 | 385 predict_mixed_cards_per_entry_ratio()); |
| 342 | 386 } |
| 387 | |
| 388 double predict_rs_scan_time_ms(size_t card_num) { | |
| 4710 | 389 if (gcs_are_young()) { |
| 342 | 390 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); |
| 4710 | 391 } else { |
| 392 return predict_mixed_rs_scan_time_ms(card_num); | |
| 393 } | |
| 342 | 394 } |
| 395 | |
| 4710 | 396 double predict_mixed_rs_scan_time_ms(size_t card_num) { |
| 397 if (_mixed_cost_per_entry_ms_seq->num() < 3) { | |
| 342 | 398 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); |
| 4710 | 399 } else { |
| 400 return (double) (card_num * | |
| 401 get_new_prediction(_mixed_cost_per_entry_ms_seq)); | |
| 402 } | |
| 342 | 403 } |
| 404 | |
| 405 double predict_object_copy_time_ms_during_cm(size_t bytes_to_copy) { | |
| 4710 | 406 if (_cost_per_byte_ms_during_cm_seq->num() < 3) { |
| 407 return (1.1 * (double) bytes_to_copy) * | |
| 408 get_new_prediction(_cost_per_byte_ms_seq); | |
| 409 } else { | |
| 342 | 410 return (double) bytes_to_copy * |
| 4710 | 411 get_new_prediction(_cost_per_byte_ms_during_cm_seq); |
| 412 } | |
| 342 | 413 } |
| 414 | |
| 415 double predict_object_copy_time_ms(size_t bytes_to_copy) { | |
| 4710 | 416 if (_in_marking_window && !_in_marking_window_im) { |
| 342 | 417 return predict_object_copy_time_ms_during_cm(bytes_to_copy); |
| 4710 | 418 } else { |
| 342 | 419 return (double) bytes_to_copy * |
| 4710 | 420 get_new_prediction(_cost_per_byte_ms_seq); |
| 421 } | |
| 342 | 422 } |
| 423 | |
| 424 double predict_constant_other_time_ms() { | |
| 425 return get_new_prediction(_constant_other_time_ms_seq); | |
| 426 } | |
| 427 | |
| 428 double predict_young_other_time_ms(size_t young_num) { | |
| 4710 | 429 return (double) young_num * |
| 430 get_new_prediction(_young_other_cost_per_region_ms_seq); | |
| 342 | 431 } |
| 432 | |
| 433 double predict_non_young_other_time_ms(size_t non_young_num) { | |
| 4710 | 434 return (double) non_young_num * |
| 435 get_new_prediction(_non_young_other_cost_per_region_ms_seq); | |
| 342 | 436 } |
| 437 | |
| 438 double predict_base_elapsed_time_ms(size_t pending_cards); | |
| 439 double predict_base_elapsed_time_ms(size_t pending_cards, | |
| 440 size_t scanned_cards); | |
| 441 size_t predict_bytes_to_copy(HeapRegion* hr); | |
| 442 double predict_region_elapsed_time_ms(HeapRegion* hr, bool young); | |
| 443 | |
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444 void set_recorded_rs_lengths(size_t rs_lengths); |
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445 |
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446 uint cset_region_length() { return young_cset_region_length() + |
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447 old_cset_region_length(); } |
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448 uint young_cset_region_length() { return eden_cset_region_length() + |
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449 survivor_cset_region_length(); } |
| 342 | 450 |
| 545 | 451 double predict_survivor_regions_evac_time(); |
| 452 | |
| 342 | 453 void cset_regions_freed() { |
| 4710 | 454 bool propagate = _last_gc_was_young && !_in_marking_window; |
| 342 | 455 _short_lived_surv_rate_group->all_surviving_words_recorded(propagate); |
| 456 _survivor_surv_rate_group->all_surviving_words_recorded(propagate); | |
| 457 // also call it on any more surv rate groups | |
| 458 } | |
| 459 | |
| 460 G1MMUTracker* mmu_tracker() { | |
| 461 return _mmu_tracker; | |
| 462 } | |
| 463 | |
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464 double max_pause_time_ms() { |
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465 return _mmu_tracker->max_gc_time() * 1000.0; |
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466 } |
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467 |
| 342 | 468 double predict_remark_time_ms() { |
| 469 return get_new_prediction(_concurrent_mark_remark_times_ms); | |
| 470 } | |
| 471 | |
| 472 double predict_cleanup_time_ms() { | |
| 473 return get_new_prediction(_concurrent_mark_cleanup_times_ms); | |
| 474 } | |
| 475 | |
| 476 // Returns an estimate of the survival rate of the region at yg-age | |
| 477 // "yg_age". | |
| 545 | 478 double predict_yg_surv_rate(int age, SurvRateGroup* surv_rate_group) { |
| 479 TruncatedSeq* seq = surv_rate_group->get_seq(age); | |
| 342 | 480 if (seq->num() == 0) |
| 481 gclog_or_tty->print("BARF! age is %d", age); | |
| 482 guarantee( seq->num() > 0, "invariant" ); | |
| 483 double pred = get_new_prediction(seq); | |
| 484 if (pred > 1.0) | |
| 485 pred = 1.0; | |
| 486 return pred; | |
| 487 } | |
| 488 | |
| 545 | 489 double predict_yg_surv_rate(int age) { |
| 490 return predict_yg_surv_rate(age, _short_lived_surv_rate_group); | |
| 491 } | |
| 492 | |
| 342 | 493 double accum_yg_surv_rate_pred(int age) { |
| 494 return _short_lived_surv_rate_group->accum_surv_rate_pred(age); | |
| 495 } | |
| 496 | |
| 4013 | 497 private: |
| 342 | 498 size_t _bytes_in_collection_set_before_gc; |
|
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499 size_t _bytes_copied_during_gc; |
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500 |
| 342 | 501 // Used to count used bytes in CS. |
| 502 friend class CountCSClosure; | |
| 503 | |
| 504 // Statistics kept per GC stoppage, pause or full. | |
| 505 TruncatedSeq* _recent_prev_end_times_for_all_gcs_sec; | |
| 506 | |
| 507 // Add a new GC of the given duration and end time to the record. | |
| 508 void update_recent_gc_times(double end_time_sec, double elapsed_ms); | |
| 509 | |
| 510 // The head of the list (via "next_in_collection_set()") representing the | |
|
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511 // current collection set. Set from the incrementally built collection |
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512 // set at the start of the pause. |
| 342 | 513 HeapRegion* _collection_set; |
|
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514 |
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515 // The number of bytes in the collection set before the pause. Set from |
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516 // the incrementally built collection set at the start of an evacuation |
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517 // pause. |
| 342 | 518 size_t _collection_set_bytes_used_before; |
| 519 | |
|
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520 // The associated information that is maintained while the incremental |
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521 // collection set is being built with young regions. Used to populate |
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522 // the recorded info for the evacuation pause. |
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523 |
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524 enum CSetBuildType { |
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525 Active, // We are actively building the collection set |
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526 Inactive // We are not actively building the collection set |
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527 }; |
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528 |
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529 CSetBuildType _inc_cset_build_state; |
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530 |
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531 // The head of the incrementally built collection set. |
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532 HeapRegion* _inc_cset_head; |
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533 |
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534 // The tail of the incrementally built collection set. |
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535 HeapRegion* _inc_cset_tail; |
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536 |
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537 // The number of bytes in the incrementally built collection set. |
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538 // Used to set _collection_set_bytes_used_before at the start of |
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539 // an evacuation pause. |
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540 size_t _inc_cset_bytes_used_before; |
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541 |
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542 // Used to record the highest end of heap region in collection set |
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543 HeapWord* _inc_cset_max_finger; |
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544 |
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545 // The RSet lengths recorded for regions in the CSet. It is updated |
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546 // by the thread that adds a new region to the CSet. We assume that |
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547 // only one thread can be allocating a new CSet region (currently, |
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548 // it does so after taking the Heap_lock) hence no need to |
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549 // synchronize updates to this field. |
|
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550 size_t _inc_cset_recorded_rs_lengths; |
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551 |
|
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552 // A concurrent refinement thread periodcially samples the young |
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553 // region RSets and needs to update _inc_cset_recorded_rs_lengths as |
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554 // the RSets grow. Instead of having to syncronize updates to that |
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555 // field we accumulate them in this field and add it to |
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556 // _inc_cset_recorded_rs_lengths_diffs at the start of a GC. |
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557 ssize_t _inc_cset_recorded_rs_lengths_diffs; |
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558 |
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559 // The predicted elapsed time it will take to collect the regions in |
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560 // the CSet. This is updated by the thread that adds a new region to |
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561 // the CSet. See the comment for _inc_cset_recorded_rs_lengths about |
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562 // MT-safety assumptions. |
|
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563 double _inc_cset_predicted_elapsed_time_ms; |
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564 |
|
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565 // See the comment for _inc_cset_recorded_rs_lengths_diffs. |
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566 double _inc_cset_predicted_elapsed_time_ms_diffs; |
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567 |
| 342 | 568 // Stash a pointer to the g1 heap. |
| 569 G1CollectedHeap* _g1; | |
| 570 | |
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571 G1GCPhaseTimes* _phase_times; |
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572 |
| 342 | 573 // The ratio of gc time to elapsed time, computed over recent pauses. |
| 574 double _recent_avg_pause_time_ratio; | |
| 575 | |
| 576 double recent_avg_pause_time_ratio() { | |
| 577 return _recent_avg_pause_time_ratio; | |
| 578 } | |
| 579 | |
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580 // At the end of a pause we check the heap occupancy and we decide |
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581 // whether we will start a marking cycle during the next pause. If |
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582 // we decide that we want to do that, we will set this parameter to |
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583 // true. So, this parameter will stay true between the end of a |
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584 // pause and the beginning of a subsequent pause (not necessarily |
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585 // the next one, see the comments on the next field) when we decide |
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586 // that we will indeed start a marking cycle and do the initial-mark |
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587 // work. |
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588 volatile bool _initiate_conc_mark_if_possible; |
| 342 | 589 |
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590 // If initiate_conc_mark_if_possible() is set at the beginning of a |
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591 // pause, it is a suggestion that the pause should start a marking |
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592 // cycle by doing the initial-mark work. However, it is possible |
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593 // that the concurrent marking thread is still finishing up the |
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594 // previous marking cycle (e.g., clearing the next marking |
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595 // bitmap). If that is the case we cannot start a new cycle and |
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596 // we'll have to wait for the concurrent marking thread to finish |
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597 // what it is doing. In this case we will postpone the marking cycle |
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598 // initiation decision for the next pause. When we eventually decide |
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599 // to start a cycle, we will set _during_initial_mark_pause which |
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600 // will stay true until the end of the initial-mark pause and it's |
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601 // the condition that indicates that a pause is doing the |
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602 // initial-mark work. |
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603 volatile bool _during_initial_mark_pause; |
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604 |
| 4710 | 605 bool _last_young_gc; |
| 342 | 606 |
| 607 // This set of variables tracks the collector efficiency, in order to | |
| 608 // determine whether we should initiate a new marking. | |
| 609 double _cur_mark_stop_world_time_ms; | |
| 610 double _mark_remark_start_sec; | |
| 611 double _mark_cleanup_start_sec; | |
| 612 | |
|
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613 // Update the young list target length either by setting it to the |
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614 // desired fixed value or by calculating it using G1's pause |
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615 // prediction model. If no rs_lengths parameter is passed, predict |
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616 // the RS lengths using the prediction model, otherwise use the |
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617 // given rs_lengths as the prediction. |
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618 void update_young_list_target_length(size_t rs_lengths = (size_t) -1); |
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619 |
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620 // Calculate and return the minimum desired young list target |
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621 // length. This is the minimum desired young list length according |
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622 // to the user's inputs. |
|
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623 uint calculate_young_list_desired_min_length(uint base_min_length); |
|
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624 |
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625 // Calculate and return the maximum desired young list target |
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626 // length. This is the maximum desired young list length according |
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627 // to the user's inputs. |
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628 uint calculate_young_list_desired_max_length(); |
|
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629 |
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630 // Calculate and return the maximum young list target length that |
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631 // can fit into the pause time goal. The parameters are: rs_lengths |
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632 // represent the prediction of how large the young RSet lengths will |
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633 // be, base_min_length is the alreay existing number of regions in |
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634 // the young list, min_length and max_length are the desired min and |
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635 // max young list length according to the user's inputs. |
|
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636 uint calculate_young_list_target_length(size_t rs_lengths, |
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637 uint base_min_length, |
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638 uint desired_min_length, |
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639 uint desired_max_length); |
|
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640 |
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641 // Check whether a given young length (young_length) fits into the |
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642 // given target pause time and whether the prediction for the amount |
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643 // of objects to be copied for the given length will fit into the |
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644 // given free space (expressed by base_free_regions). It is used by |
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645 // calculate_young_list_target_length(). |
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646 bool predict_will_fit(uint young_length, double base_time_ms, |
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647 uint base_free_regions, double target_pause_time_ms); |
| 342 | 648 |
| 4013 | 649 // Count the number of bytes used in the CS. |
| 650 void count_CS_bytes_used(); | |
| 651 | |
| 342 | 652 public: |
| 653 | |
| 654 G1CollectorPolicy(); | |
| 655 | |
| 656 virtual G1CollectorPolicy* as_g1_policy() { return this; } | |
| 657 | |
| 658 virtual CollectorPolicy::Name kind() { | |
| 659 return CollectorPolicy::G1CollectorPolicyKind; | |
| 660 } | |
| 661 | |
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662 G1GCPhaseTimes* phase_times() const { return _phase_times; } |
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663 |
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664 // Check the current value of the young list RSet lengths and |
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665 // compare it against the last prediction. If the current value is |
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666 // higher, recalculate the young list target length prediction. |
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667 void revise_young_list_target_length_if_necessary(); |
| 342 | 668 |
| 669 size_t bytes_in_collection_set() { | |
| 670 return _bytes_in_collection_set_before_gc; | |
| 671 } | |
| 672 | |
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673 // This should be called after the heap is resized. |
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674 void record_new_heap_size(uint new_number_of_regions); |
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675 |
| 4013 | 676 void init(); |
| 342 | 677 |
| 545 | 678 // Create jstat counters for the policy. |
| 679 virtual void initialize_gc_policy_counters(); | |
| 680 | |
| 342 | 681 virtual HeapWord* mem_allocate_work(size_t size, |
| 682 bool is_tlab, | |
| 683 bool* gc_overhead_limit_was_exceeded); | |
| 684 | |
| 685 // This method controls how a collector handles one or more | |
| 686 // of its generations being fully allocated. | |
| 687 virtual HeapWord* satisfy_failed_allocation(size_t size, | |
| 688 bool is_tlab); | |
| 689 | |
| 690 BarrierSet::Name barrier_set_name() { return BarrierSet::G1SATBCTLogging; } | |
| 691 | |
| 692 GenRemSet::Name rem_set_name() { return GenRemSet::CardTable; } | |
| 693 | |
|
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694 bool need_to_start_conc_mark(const char* source, size_t alloc_word_size = 0); |
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695 |
| 342 | 696 // Update the heuristic info to record a collection pause of the given |
| 697 // start time, where the given number of bytes were used at the start. | |
| 698 // This may involve changing the desired size of a collection set. | |
| 699 | |
| 4013 | 700 void record_stop_world_start(); |
| 342 | 701 |
| 4013 | 702 void record_collection_pause_start(double start_time_sec, size_t start_used); |
| 342 | 703 |
| 704 // Must currently be called while the world is stopped. | |
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705 void record_concurrent_mark_init_end(double |
| 342 | 706 mark_init_elapsed_time_ms); |
| 707 | |
| 4013 | 708 void record_concurrent_mark_remark_start(); |
| 709 void record_concurrent_mark_remark_end(); | |
| 342 | 710 |
| 4013 | 711 void record_concurrent_mark_cleanup_start(); |
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712 void record_concurrent_mark_cleanup_end(int no_of_gc_threads); |
| 4013 | 713 void record_concurrent_mark_cleanup_completed(); |
| 342 | 714 |
| 4013 | 715 void record_concurrent_pause(); |
| 342 | 716 |
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717 void record_collection_pause_end(double pause_time); |
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718 void print_heap_transition(); |
| 342 | 719 |
| 720 // Record the fact that a full collection occurred. | |
| 4013 | 721 void record_full_collection_start(); |
| 722 void record_full_collection_end(); | |
| 342 | 723 |
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724 // Record how much space we copied during a GC. This is typically |
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725 // called when a GC alloc region is being retired. |
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726 void record_bytes_copied_during_gc(size_t bytes) { |
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727 _bytes_copied_during_gc += bytes; |
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728 } |
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729 |
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730 // The amount of space we copied during a GC. |
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731 size_t bytes_copied_during_gc() { |
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732 return _bytes_copied_during_gc; |
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733 } |
| 342 | 734 |
|
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735 // Determine whether there are candidate regions so that the |
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736 // next GC should be mixed. The two action strings are used |
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737 // in the ergo output when the method returns true or false. |
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738 bool next_gc_should_be_mixed(const char* true_action_str, |
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739 const char* false_action_str); |
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740 |
| 342 | 741 // Choose a new collection set. Marks the chosen regions as being |
| 742 // "in_collection_set", and links them together. The head and number of | |
| 743 // the collection set are available via access methods. | |
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744 void finalize_cset(double target_pause_time_ms); |
| 342 | 745 |
| 746 // The head of the list (via "next_in_collection_set()") representing the | |
| 747 // current collection set. | |
| 748 HeapRegion* collection_set() { return _collection_set; } | |
| 749 | |
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750 void clear_collection_set() { _collection_set = NULL; } |
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751 |
|
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752 // Add old region "hr" to the CSet. |
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753 void add_old_region_to_cset(HeapRegion* hr); |
| 342 | 754 |
|
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755 // Incremental CSet Support |
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756 |
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757 // The head of the incrementally built collection set. |
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758 HeapRegion* inc_cset_head() { return _inc_cset_head; } |
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759 |
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760 // The tail of the incrementally built collection set. |
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761 HeapRegion* inc_set_tail() { return _inc_cset_tail; } |
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762 |
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763 // Initialize incremental collection set info. |
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764 void start_incremental_cset_building(); |
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765 |
|
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766 // Perform any final calculations on the incremental CSet fields |
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767 // before we can use them. |
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768 void finalize_incremental_cset_building(); |
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769 |
|
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770 void clear_incremental_cset() { |
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771 _inc_cset_head = NULL; |
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772 _inc_cset_tail = NULL; |
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773 } |
|
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774 |
|
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775 // Stop adding regions to the incremental collection set |
|
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|
776 void stop_incremental_cset_building() { _inc_cset_build_state = Inactive; } |
|
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|
777 |
|
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778 // Add information about hr to the aggregated information for the |
|
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779 // incrementally built collection set. |
|
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780 void add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length); |
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781 |
|
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782 // Update information about hr in the aggregated information for |
|
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783 // the incrementally built collection set. |
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784 void update_incremental_cset_info(HeapRegion* hr, size_t new_rs_length); |
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785 |
|
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|
786 private: |
|
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|
787 // Update the incremental cset information when adding a region |
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788 // (should not be called directly). |
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789 void add_region_to_incremental_cset_common(HeapRegion* hr); |
|
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790 |
|
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|
791 public: |
|
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|
792 // Add hr to the LHS of the incremental collection set. |
|
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793 void add_region_to_incremental_cset_lhs(HeapRegion* hr); |
|
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794 |
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795 // Add hr to the RHS of the incremental collection set. |
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796 void add_region_to_incremental_cset_rhs(HeapRegion* hr); |
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797 |
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798 #ifndef PRODUCT |
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799 void print_collection_set(HeapRegion* list_head, outputStream* st); |
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800 #endif // !PRODUCT |
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801 |
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802 bool initiate_conc_mark_if_possible() { return _initiate_conc_mark_if_possible; } |
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803 void set_initiate_conc_mark_if_possible() { _initiate_conc_mark_if_possible = true; } |
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804 void clear_initiate_conc_mark_if_possible() { _initiate_conc_mark_if_possible = false; } |
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805 |
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806 bool during_initial_mark_pause() { return _during_initial_mark_pause; } |
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807 void set_during_initial_mark_pause() { _during_initial_mark_pause = true; } |
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808 void clear_during_initial_mark_pause(){ _during_initial_mark_pause = false; } |
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809 |
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810 // This sets the initiate_conc_mark_if_possible() flag to start a |
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811 // new cycle, as long as we are not already in one. It's best if it |
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812 // is called during a safepoint when the test whether a cycle is in |
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813 // progress or not is stable. |
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814 bool force_initial_mark_if_outside_cycle(GCCause::Cause gc_cause); |
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815 |
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816 // This is called at the very beginning of an evacuation pause (it |
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817 // has to be the first thing that the pause does). If |
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818 // initiate_conc_mark_if_possible() is true, and the concurrent |
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819 // marking thread has completed its work during the previous cycle, |
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820 // it will set during_initial_mark_pause() to so that the pause does |
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821 // the initial-mark work and start a marking cycle. |
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822 void decide_on_conc_mark_initiation(); |
| 342 | 823 |
| 824 // If an expansion would be appropriate, because recent GC overhead had | |
| 825 // exceeded the desired limit, return an amount to expand by. | |
| 4013 | 826 size_t expansion_amount(); |
| 342 | 827 |
| 828 // Print tracing information. | |
| 829 void print_tracing_info() const; | |
| 830 | |
| 831 // Print stats on young survival ratio | |
| 832 void print_yg_surv_rate_info() const; | |
| 833 | |
| 545 | 834 void finished_recalculating_age_indexes(bool is_survivors) { |
| 835 if (is_survivors) { | |
| 836 _survivor_surv_rate_group->finished_recalculating_age_indexes(); | |
| 837 } else { | |
| 838 _short_lived_surv_rate_group->finished_recalculating_age_indexes(); | |
| 839 } | |
| 342 | 840 // do that for any other surv rate groups |
| 841 } | |
| 842 | |
| 1973 | 843 bool is_young_list_full() { |
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844 uint young_list_length = _g1->young_list()->length(); |
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845 uint young_list_target_length = _young_list_target_length; |
|
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846 return young_list_length >= young_list_target_length; |
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847 } |
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848 |
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849 bool can_expand_young_list() { |
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850 uint young_list_length = _g1->young_list()->length(); |
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851 uint young_list_max_length = _young_list_max_length; |
|
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852 return young_list_length < young_list_max_length; |
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853 } |
| 1973 | 854 |
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855 uint young_list_max_length() { |
|
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856 return _young_list_max_length; |
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857 } |
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858 |
| 4710 | 859 bool gcs_are_young() { |
| 860 return _gcs_are_young; | |
| 342 | 861 } |
| 4710 | 862 void set_gcs_are_young(bool gcs_are_young) { |
| 863 _gcs_are_young = gcs_are_young; | |
| 342 | 864 } |
| 865 | |
| 866 bool adaptive_young_list_length() { | |
|
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867 return _young_gen_sizer->adaptive_young_list_length(); |
| 342 | 868 } |
| 869 | |
| 4013 | 870 private: |
| 342 | 871 // |
| 872 // Survivor regions policy. | |
| 873 // | |
| 874 | |
| 875 // Current tenuring threshold, set to 0 if the collector reaches the | |
| 876 // maximum amount of suvivors regions. | |
| 877 int _tenuring_threshold; | |
| 878 | |
| 545 | 879 // The limit on the number of regions allocated for survivors. |
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880 uint _max_survivor_regions; |
| 545 | 881 |
|
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882 // For reporting purposes. |
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883 size_t _eden_bytes_before_gc; |
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884 size_t _survivor_bytes_before_gc; |
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885 size_t _capacity_before_gc; |
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886 |
| 545 | 887 // The amount of survor regions after a collection. |
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888 uint _recorded_survivor_regions; |
| 545 | 889 // List of survivor regions. |
| 890 HeapRegion* _recorded_survivor_head; | |
| 891 HeapRegion* _recorded_survivor_tail; | |
| 892 | |
| 893 ageTable _survivors_age_table; | |
| 894 | |
| 342 | 895 public: |
| 896 | |
| 897 inline GCAllocPurpose | |
| 898 evacuation_destination(HeapRegion* src_region, int age, size_t word_sz) { | |
| 899 if (age < _tenuring_threshold && src_region->is_young()) { | |
| 900 return GCAllocForSurvived; | |
| 901 } else { | |
| 902 return GCAllocForTenured; | |
| 903 } | |
| 904 } | |
| 905 | |
| 906 inline bool track_object_age(GCAllocPurpose purpose) { | |
| 907 return purpose == GCAllocForSurvived; | |
| 908 } | |
| 909 | |
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910 static const uint REGIONS_UNLIMITED = (uint) -1; |
| 545 | 911 |
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912 uint max_regions(int purpose); |
| 342 | 913 |
| 914 // The limit on regions for a particular purpose is reached. | |
| 915 void note_alloc_region_limit_reached(int purpose) { | |
| 916 if (purpose == GCAllocForSurvived) { | |
| 917 _tenuring_threshold = 0; | |
| 918 } | |
| 919 } | |
| 920 | |
| 921 void note_start_adding_survivor_regions() { | |
| 922 _survivor_surv_rate_group->start_adding_regions(); | |
| 923 } | |
| 924 | |
| 925 void note_stop_adding_survivor_regions() { | |
| 926 _survivor_surv_rate_group->stop_adding_regions(); | |
| 927 } | |
| 545 | 928 |
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929 void record_survivor_regions(uint regions, |
| 545 | 930 HeapRegion* head, |
| 931 HeapRegion* tail) { | |
| 932 _recorded_survivor_regions = regions; | |
| 933 _recorded_survivor_head = head; | |
| 934 _recorded_survivor_tail = tail; | |
| 935 } | |
| 936 | |
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937 uint recorded_survivor_regions() { |
|
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938 return _recorded_survivor_regions; |
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939 } |
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940 |
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941 void record_thread_age_table(ageTable* age_table) { |
| 545 | 942 _survivors_age_table.merge_par(age_table); |
| 943 } | |
| 944 | |
|
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945 void update_max_gc_locker_expansion(); |
|
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946 |
| 545 | 947 // Calculates survivor space parameters. |
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948 void update_survivors_policy(); |
| 545 | 949 |
| 342 | 950 }; |
| 951 | |
| 952 // This should move to some place more general... | |
| 953 | |
| 954 // If we have "n" measurements, and we've kept track of their "sum" and the | |
| 955 // "sum_of_squares" of the measurements, this returns the variance of the | |
| 956 // sequence. | |
| 957 inline double variance(int n, double sum_of_squares, double sum) { | |
| 958 double n_d = (double)n; | |
| 959 double avg = sum/n_d; | |
| 960 return (sum_of_squares - 2.0 * avg * sum + n_d * avg * avg) / n_d; | |
| 961 } | |
| 962 | |
| 1972 | 963 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTORPOLICY_HPP |