Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.hpp @ 6109:bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
Summary: Simplify code, remove unused code, remove ExitAfterGCNum
Reviewed-by: huntch, johnc
| author | brutisso |
|---|---|
| date | Thu, 31 May 2012 21:10:33 +0200 |
| parents | 3a22b77e755a |
| children | d2a62e0f25eb 922993931b3d |
| rev | line source |
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| 342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTORPOLICY_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTORPOLICY_HPP | |
| 27 | |
| 28 #include "gc_implementation/g1/collectionSetChooser.hpp" | |
| 29 #include "gc_implementation/g1/g1MMUTracker.hpp" | |
| 30 #include "memory/collectorPolicy.hpp" | |
| 31 | |
| 342 | 32 // A G1CollectorPolicy makes policy decisions that determine the |
| 33 // characteristics of the collector. Examples include: | |
| 34 // * choice of collection set. | |
| 35 // * when to collect. | |
| 36 | |
| 37 class HeapRegion; | |
| 38 class CollectionSetChooser; | |
| 39 | |
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40 // TraceGen0Time collects data on _both_ young and mixed evacuation pauses |
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41 // (the latter may contain non-young regions - i.e. regions that are |
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42 // technically in Gen1) while TraceGen1Time collects data about full GCs. |
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43 class TraceGen0TimeData : public CHeapObj { |
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44 private: |
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45 unsigned _young_pause_num; |
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46 unsigned _mixed_pause_num; |
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47 |
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48 NumberSeq _all_stop_world_times_ms; |
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49 NumberSeq _all_yield_times_ms; |
| 342 | 50 |
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51 NumberSeq _total; |
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52 NumberSeq _other; |
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53 NumberSeq _root_region_scan_wait; |
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54 NumberSeq _parallel; |
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55 NumberSeq _ext_root_scan; |
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56 NumberSeq _satb_filtering; |
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57 NumberSeq _update_rs; |
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58 NumberSeq _scan_rs; |
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59 NumberSeq _obj_copy; |
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60 NumberSeq _termination; |
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61 NumberSeq _parallel_other; |
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62 NumberSeq _clear_ct; |
| 342 | 63 |
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64 void print_summary (int level, const char* str, const NumberSeq* seq) const; |
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65 void print_summary_sd (int level, const char* str, const NumberSeq* seq) const; |
| 342 | 66 |
| 67 public: | |
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68 TraceGen0TimeData() : _young_pause_num(0), _mixed_pause_num(0) {}; |
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69 void record_start_collection(double time_to_stop_the_world_ms); |
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70 void record_yield_time(double yield_time_ms); |
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71 void record_end_collection( |
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72 double total_ms, |
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73 double other_ms, |
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74 double root_region_scan_wait_ms, |
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75 double parallel_ms, |
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76 double ext_root_scan_ms, |
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77 double satb_filtering_ms, |
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78 double update_rs_ms, |
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79 double scan_rs_ms, |
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80 double obj_copy_ms, |
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81 double termination_ms, |
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82 double parallel_other_ms, |
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83 double clear_ct_ms); |
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84 void increment_young_collection_count(); |
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85 void increment_mixed_collection_count(); |
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86 void print() const; |
| 342 | 87 }; |
| 88 | |
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89 class TraceGen1TimeData : public CHeapObj { |
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90 private: |
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91 NumberSeq _all_full_gc_times; |
| 342 | 92 |
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93 public: |
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94 void record_full_collection(double full_gc_time_ms); |
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95 void print() const; |
| 342 | 96 }; |
| 97 | |
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98 // There are three command line options related to the young gen size: |
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99 // NewSize, MaxNewSize and NewRatio (There is also -Xmn, but that is |
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100 // just a short form for NewSize==MaxNewSize). G1 will use its internal |
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101 // heuristics to calculate the actual young gen size, so these options |
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102 // basically only limit the range within which G1 can pick a young gen |
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103 // size. Also, these are general options taking byte sizes. G1 will |
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104 // internally work with a number of regions instead. So, some rounding |
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105 // will occur. |
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106 // |
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107 // If nothing related to the the young gen size is set on the command |
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108 // line we should allow the young gen to be between |
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109 // G1DefaultMinNewGenPercent and G1DefaultMaxNewGenPercent of the |
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110 // heap size. This means that every time the heap size changes the |
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111 // limits for the young gen size will be updated. |
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112 // |
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113 // If only -XX:NewSize is set we should use the specified value as the |
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114 // minimum size for young gen. Still using G1DefaultMaxNewGenPercent |
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115 // of the heap as maximum. |
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116 // |
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117 // If only -XX:MaxNewSize is set we should use the specified value as the |
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118 // maximum size for young gen. Still using G1DefaultMinNewGenPercent |
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119 // of the heap as minimum. |
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120 // |
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121 // If -XX:NewSize and -XX:MaxNewSize are both specified we use these values. |
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122 // No updates when the heap size changes. There is a special case when |
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123 // NewSize==MaxNewSize. This is interpreted as "fixed" and will use a |
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124 // different heuristic for calculating the collection set when we do mixed |
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125 // collection. |
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126 // |
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127 // If only -XX:NewRatio is set we should use the specified ratio of the heap |
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128 // as both min and max. This will be interpreted as "fixed" just like the |
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129 // NewSize==MaxNewSize case above. But we will update the min and max |
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130 // everytime the heap size changes. |
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131 // |
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132 // NewSize and MaxNewSize override NewRatio. So, NewRatio is ignored if it is |
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133 // combined with either NewSize or MaxNewSize. (A warning message is printed.) |
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134 class G1YoungGenSizer : public CHeapObj { |
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135 private: |
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136 enum SizerKind { |
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137 SizerDefaults, |
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138 SizerNewSizeOnly, |
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139 SizerMaxNewSizeOnly, |
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140 SizerMaxAndNewSize, |
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141 SizerNewRatio |
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142 }; |
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143 SizerKind _sizer_kind; |
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144 uint _min_desired_young_length; |
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145 uint _max_desired_young_length; |
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146 bool _adaptive_size; |
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147 uint calculate_default_min_length(uint new_number_of_heap_regions); |
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148 uint calculate_default_max_length(uint new_number_of_heap_regions); |
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149 |
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150 public: |
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151 G1YoungGenSizer(); |
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152 void heap_size_changed(uint new_number_of_heap_regions); |
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153 uint min_desired_young_length() { |
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154 return _min_desired_young_length; |
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155 } |
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156 uint max_desired_young_length() { |
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157 return _max_desired_young_length; |
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158 } |
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159 bool adaptive_young_list_length() { |
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160 return _adaptive_size; |
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161 } |
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162 }; |
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163 |
| 342 | 164 class G1CollectorPolicy: public CollectorPolicy { |
| 4013 | 165 private: |
| 342 | 166 // either equal to the number of parallel threads, if ParallelGCThreads |
| 167 // has been set, or 1 otherwise | |
| 168 int _parallel_gc_threads; | |
| 169 | |
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170 // The number of GC threads currently active. |
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171 uintx _no_of_gc_threads; |
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172 |
| 342 | 173 enum SomePrivateConstants { |
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174 NumPrevPausesForHeuristics = 10 |
| 342 | 175 }; |
| 176 | |
| 177 G1MMUTracker* _mmu_tracker; | |
| 178 | |
| 179 void initialize_flags(); | |
| 180 | |
| 181 void initialize_all() { | |
| 182 initialize_flags(); | |
| 183 initialize_size_info(); | |
| 184 initialize_perm_generation(PermGen::MarkSweepCompact); | |
| 185 } | |
| 186 | |
| 4013 | 187 CollectionSetChooser* _collectionSetChooser; |
| 342 | 188 |
| 189 double _cur_collection_start_sec; | |
| 190 size_t _cur_collection_pause_used_at_start_bytes; | |
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191 uint _cur_collection_pause_used_regions_at_start; |
| 342 | 192 double _cur_collection_par_time_ms; |
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193 |
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194 double _cur_collection_code_root_fixup_time_ms; |
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195 |
| 342 | 196 double _cur_clear_ct_time_ms; |
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197 double _cur_ref_proc_time_ms; |
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198 double _cur_ref_enq_time_ms; |
| 342 | 199 |
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200 #ifndef PRODUCT |
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201 // Card Table Count Cache stats |
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202 double _min_clear_cc_time_ms; // min |
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203 double _max_clear_cc_time_ms; // max |
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204 double _cur_clear_cc_time_ms; // clearing time during current pause |
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205 double _cum_clear_cc_time_ms; // cummulative clearing time |
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206 jlong _num_cc_clears; // number of times the card count cache has been cleared |
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207 #endif |
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208 |
| 342 | 209 // These exclude marking times. |
| 210 TruncatedSeq* _recent_gc_times_ms; | |
| 211 | |
| 212 TruncatedSeq* _concurrent_mark_remark_times_ms; | |
| 213 TruncatedSeq* _concurrent_mark_cleanup_times_ms; | |
| 214 | |
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215 TraceGen0TimeData _trace_gen0_time_data; |
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216 TraceGen1TimeData _trace_gen1_time_data; |
| 342 | 217 |
| 218 double _stop_world_start; | |
| 219 | |
| 1611 | 220 double* _par_last_gc_worker_start_times_ms; |
| 342 | 221 double* _par_last_ext_root_scan_times_ms; |
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222 double* _par_last_satb_filtering_times_ms; |
| 342 | 223 double* _par_last_update_rs_times_ms; |
| 224 double* _par_last_update_rs_processed_buffers; | |
| 225 double* _par_last_scan_rs_times_ms; | |
| 226 double* _par_last_obj_copy_times_ms; | |
| 227 double* _par_last_termination_times_ms; | |
| 1611 | 228 double* _par_last_termination_attempts; |
| 229 double* _par_last_gc_worker_end_times_ms; | |
| 2430 | 230 double* _par_last_gc_worker_times_ms; |
| 342 | 231 |
| 4023 | 232 // Each workers 'other' time i.e. the elapsed time of the parallel |
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233 // code executed by a worker minus the sum of the individual sub-phase |
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234 // times for that worker thread. |
| 4023 | 235 double* _par_last_gc_worker_other_times_ms; |
| 236 | |
| 4710 | 237 // indicates whether we are in young or mixed GC mode |
| 238 bool _gcs_are_young; | |
| 342 | 239 |
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240 uint _young_list_target_length; |
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241 uint _young_list_fixed_length; |
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242 size_t _prev_eden_capacity; // used for logging |
| 342 | 243 |
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244 // The max number of regions we can extend the eden by while the GC |
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245 // locker is active. This should be >= _young_list_target_length; |
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246 uint _young_list_max_length; |
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247 |
| 4710 | 248 bool _last_gc_was_young; |
| 342 | 249 |
| 250 bool _during_marking; | |
| 251 bool _in_marking_window; | |
| 252 bool _in_marking_window_im; | |
| 253 | |
| 254 SurvRateGroup* _short_lived_surv_rate_group; | |
| 255 SurvRateGroup* _survivor_surv_rate_group; | |
| 256 // add here any more surv rate groups | |
| 257 | |
| 1356 | 258 double _gc_overhead_perc; |
| 259 | |
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260 double _reserve_factor; |
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261 uint _reserve_regions; |
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262 |
| 342 | 263 bool during_marking() { |
| 264 return _during_marking; | |
| 265 } | |
| 266 | |
| 267 private: | |
| 268 enum PredictionConstants { | |
| 269 TruncatedSeqLength = 10 | |
| 270 }; | |
| 271 | |
| 272 TruncatedSeq* _alloc_rate_ms_seq; | |
| 273 double _prev_collection_pause_end_ms; | |
| 274 | |
| 275 TruncatedSeq* _pending_card_diff_seq; | |
| 276 TruncatedSeq* _rs_length_diff_seq; | |
| 277 TruncatedSeq* _cost_per_card_ms_seq; | |
| 4710 | 278 TruncatedSeq* _young_cards_per_entry_ratio_seq; |
| 279 TruncatedSeq* _mixed_cards_per_entry_ratio_seq; | |
| 342 | 280 TruncatedSeq* _cost_per_entry_ms_seq; |
| 4710 | 281 TruncatedSeq* _mixed_cost_per_entry_ms_seq; |
| 342 | 282 TruncatedSeq* _cost_per_byte_ms_seq; |
| 283 TruncatedSeq* _constant_other_time_ms_seq; | |
| 284 TruncatedSeq* _young_other_cost_per_region_ms_seq; | |
| 285 TruncatedSeq* _non_young_other_cost_per_region_ms_seq; | |
| 286 | |
| 287 TruncatedSeq* _pending_cards_seq; | |
| 288 TruncatedSeq* _rs_lengths_seq; | |
| 289 | |
| 290 TruncatedSeq* _cost_per_byte_ms_during_cm_seq; | |
| 291 | |
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292 G1YoungGenSizer* _young_gen_sizer; |
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293 |
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294 uint _eden_cset_region_length; |
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295 uint _survivor_cset_region_length; |
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296 uint _old_cset_region_length; |
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297 |
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298 void init_cset_region_lengths(uint eden_cset_region_length, |
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299 uint survivor_cset_region_length); |
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300 |
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301 uint eden_cset_region_length() { return _eden_cset_region_length; } |
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302 uint survivor_cset_region_length() { return _survivor_cset_region_length; } |
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303 uint old_cset_region_length() { return _old_cset_region_length; } |
| 342 | 304 |
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305 uint _free_regions_at_end_of_collection; |
| 342 | 306 |
| 307 size_t _recorded_rs_lengths; | |
| 308 size_t _max_rs_lengths; | |
| 309 | |
| 310 double _recorded_young_free_cset_time_ms; | |
| 311 double _recorded_non_young_free_cset_time_ms; | |
| 312 | |
| 313 double _sigma; | |
| 314 | |
| 315 size_t _rs_lengths_prediction; | |
| 316 | |
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317 double sigma() { return _sigma; } |
| 342 | 318 |
| 319 // A function that prevents us putting too much stock in small sample | |
| 320 // sets. Returns a number between 2.0 and 1.0, depending on the number | |
| 321 // of samples. 5 or more samples yields one; fewer scales linearly from | |
| 322 // 2.0 at 1 sample to 1.0 at 5. | |
| 323 double confidence_factor(int samples) { | |
| 324 if (samples > 4) return 1.0; | |
| 325 else return 1.0 + sigma() * ((double)(5 - samples))/2.0; | |
| 326 } | |
| 327 | |
| 328 double get_new_neg_prediction(TruncatedSeq* seq) { | |
| 329 return seq->davg() - sigma() * seq->dsd(); | |
| 330 } | |
| 331 | |
| 332 #ifndef PRODUCT | |
| 333 bool verify_young_ages(HeapRegion* head, SurvRateGroup *surv_rate_group); | |
| 334 #endif // PRODUCT | |
| 335 | |
| 1111 | 336 void adjust_concurrent_refinement(double update_rs_time, |
| 337 double update_rs_processed_buffers, | |
| 338 double goal_ms); | |
| 339 | |
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340 uintx no_of_gc_threads() { return _no_of_gc_threads; } |
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341 void set_no_of_gc_threads(uintx v) { _no_of_gc_threads = v; } |
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342 |
| 342 | 343 double _pause_time_target_ms; |
| 344 double _recorded_young_cset_choice_time_ms; | |
| 345 double _recorded_non_young_cset_choice_time_ms; | |
| 346 size_t _pending_cards; | |
| 347 size_t _max_pending_cards; | |
| 348 | |
| 349 public: | |
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350 // Accessors |
| 342 | 351 |
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352 void set_region_eden(HeapRegion* hr, int young_index_in_cset) { |
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353 hr->set_young(); |
| 342 | 354 hr->install_surv_rate_group(_short_lived_surv_rate_group); |
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355 hr->set_young_index_in_cset(young_index_in_cset); |
| 342 | 356 } |
| 357 | |
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358 void set_region_survivor(HeapRegion* hr, int young_index_in_cset) { |
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359 assert(hr->is_young() && hr->is_survivor(), "pre-condition"); |
| 342 | 360 hr->install_surv_rate_group(_survivor_surv_rate_group); |
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361 hr->set_young_index_in_cset(young_index_in_cset); |
| 342 | 362 } |
| 363 | |
| 364 #ifndef PRODUCT | |
| 365 bool verify_young_ages(); | |
| 366 #endif // PRODUCT | |
| 367 | |
| 368 double get_new_prediction(TruncatedSeq* seq) { | |
| 369 return MAX2(seq->davg() + sigma() * seq->dsd(), | |
| 370 seq->davg() * confidence_factor(seq->num())); | |
| 371 } | |
| 372 | |
| 373 void record_max_rs_lengths(size_t rs_lengths) { | |
| 374 _max_rs_lengths = rs_lengths; | |
| 375 } | |
| 376 | |
| 377 size_t predict_pending_card_diff() { | |
| 378 double prediction = get_new_neg_prediction(_pending_card_diff_seq); | |
| 4710 | 379 if (prediction < 0.00001) { |
| 342 | 380 return 0; |
| 4710 | 381 } else { |
| 342 | 382 return (size_t) prediction; |
| 4710 | 383 } |
| 342 | 384 } |
| 385 | |
| 386 size_t predict_pending_cards() { | |
| 387 size_t max_pending_card_num = _g1->max_pending_card_num(); | |
| 388 size_t diff = predict_pending_card_diff(); | |
| 389 size_t prediction; | |
| 4710 | 390 if (diff > max_pending_card_num) { |
| 342 | 391 prediction = max_pending_card_num; |
| 4710 | 392 } else { |
| 342 | 393 prediction = max_pending_card_num - diff; |
| 4710 | 394 } |
| 342 | 395 |
| 396 return prediction; | |
| 397 } | |
| 398 | |
| 399 size_t predict_rs_length_diff() { | |
| 400 return (size_t) get_new_prediction(_rs_length_diff_seq); | |
| 401 } | |
| 402 | |
| 403 double predict_alloc_rate_ms() { | |
| 404 return get_new_prediction(_alloc_rate_ms_seq); | |
| 405 } | |
| 406 | |
| 407 double predict_cost_per_card_ms() { | |
| 408 return get_new_prediction(_cost_per_card_ms_seq); | |
| 409 } | |
| 410 | |
| 411 double predict_rs_update_time_ms(size_t pending_cards) { | |
| 412 return (double) pending_cards * predict_cost_per_card_ms(); | |
| 413 } | |
| 414 | |
| 4710 | 415 double predict_young_cards_per_entry_ratio() { |
| 416 return get_new_prediction(_young_cards_per_entry_ratio_seq); | |
| 342 | 417 } |
| 418 | |
| 4710 | 419 double predict_mixed_cards_per_entry_ratio() { |
| 420 if (_mixed_cards_per_entry_ratio_seq->num() < 2) { | |
| 421 return predict_young_cards_per_entry_ratio(); | |
| 422 } else { | |
| 423 return get_new_prediction(_mixed_cards_per_entry_ratio_seq); | |
| 424 } | |
| 342 | 425 } |
| 426 | |
| 427 size_t predict_young_card_num(size_t rs_length) { | |
| 428 return (size_t) ((double) rs_length * | |
| 4710 | 429 predict_young_cards_per_entry_ratio()); |
| 342 | 430 } |
| 431 | |
| 432 size_t predict_non_young_card_num(size_t rs_length) { | |
| 433 return (size_t) ((double) rs_length * | |
| 4710 | 434 predict_mixed_cards_per_entry_ratio()); |
| 342 | 435 } |
| 436 | |
| 437 double predict_rs_scan_time_ms(size_t card_num) { | |
| 4710 | 438 if (gcs_are_young()) { |
| 342 | 439 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); |
| 4710 | 440 } else { |
| 441 return predict_mixed_rs_scan_time_ms(card_num); | |
| 442 } | |
| 342 | 443 } |
| 444 | |
| 4710 | 445 double predict_mixed_rs_scan_time_ms(size_t card_num) { |
| 446 if (_mixed_cost_per_entry_ms_seq->num() < 3) { | |
| 342 | 447 return (double) card_num * get_new_prediction(_cost_per_entry_ms_seq); |
| 4710 | 448 } else { |
| 449 return (double) (card_num * | |
| 450 get_new_prediction(_mixed_cost_per_entry_ms_seq)); | |
| 451 } | |
| 342 | 452 } |
| 453 | |
| 454 double predict_object_copy_time_ms_during_cm(size_t bytes_to_copy) { | |
| 4710 | 455 if (_cost_per_byte_ms_during_cm_seq->num() < 3) { |
| 456 return (1.1 * (double) bytes_to_copy) * | |
| 457 get_new_prediction(_cost_per_byte_ms_seq); | |
| 458 } else { | |
| 342 | 459 return (double) bytes_to_copy * |
| 4710 | 460 get_new_prediction(_cost_per_byte_ms_during_cm_seq); |
| 461 } | |
| 342 | 462 } |
| 463 | |
| 464 double predict_object_copy_time_ms(size_t bytes_to_copy) { | |
| 4710 | 465 if (_in_marking_window && !_in_marking_window_im) { |
| 342 | 466 return predict_object_copy_time_ms_during_cm(bytes_to_copy); |
| 4710 | 467 } else { |
| 342 | 468 return (double) bytes_to_copy * |
| 4710 | 469 get_new_prediction(_cost_per_byte_ms_seq); |
| 470 } | |
| 342 | 471 } |
| 472 | |
| 473 double predict_constant_other_time_ms() { | |
| 474 return get_new_prediction(_constant_other_time_ms_seq); | |
| 475 } | |
| 476 | |
| 477 double predict_young_other_time_ms(size_t young_num) { | |
| 4710 | 478 return (double) young_num * |
| 479 get_new_prediction(_young_other_cost_per_region_ms_seq); | |
| 342 | 480 } |
| 481 | |
| 482 double predict_non_young_other_time_ms(size_t non_young_num) { | |
| 4710 | 483 return (double) non_young_num * |
| 484 get_new_prediction(_non_young_other_cost_per_region_ms_seq); | |
| 342 | 485 } |
| 486 | |
| 487 double predict_base_elapsed_time_ms(size_t pending_cards); | |
| 488 double predict_base_elapsed_time_ms(size_t pending_cards, | |
| 489 size_t scanned_cards); | |
| 490 size_t predict_bytes_to_copy(HeapRegion* hr); | |
| 491 double predict_region_elapsed_time_ms(HeapRegion* hr, bool young); | |
| 492 | |
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493 void set_recorded_rs_lengths(size_t rs_lengths); |
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494 |
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495 uint cset_region_length() { return young_cset_region_length() + |
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496 old_cset_region_length(); } |
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497 uint young_cset_region_length() { return eden_cset_region_length() + |
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498 survivor_cset_region_length(); } |
| 342 | 499 |
| 500 void record_young_free_cset_time_ms(double time_ms) { | |
| 501 _recorded_young_free_cset_time_ms = time_ms; | |
| 502 } | |
| 503 | |
| 504 void record_non_young_free_cset_time_ms(double time_ms) { | |
| 505 _recorded_non_young_free_cset_time_ms = time_ms; | |
| 506 } | |
| 507 | |
| 545 | 508 double predict_survivor_regions_evac_time(); |
| 509 | |
| 342 | 510 void cset_regions_freed() { |
| 4710 | 511 bool propagate = _last_gc_was_young && !_in_marking_window; |
| 342 | 512 _short_lived_surv_rate_group->all_surviving_words_recorded(propagate); |
| 513 _survivor_surv_rate_group->all_surviving_words_recorded(propagate); | |
| 514 // also call it on any more surv rate groups | |
| 515 } | |
| 516 | |
| 517 G1MMUTracker* mmu_tracker() { | |
| 518 return _mmu_tracker; | |
| 519 } | |
| 520 | |
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521 double max_pause_time_ms() { |
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522 return _mmu_tracker->max_gc_time() * 1000.0; |
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523 } |
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524 |
| 342 | 525 double predict_remark_time_ms() { |
| 526 return get_new_prediction(_concurrent_mark_remark_times_ms); | |
| 527 } | |
| 528 | |
| 529 double predict_cleanup_time_ms() { | |
| 530 return get_new_prediction(_concurrent_mark_cleanup_times_ms); | |
| 531 } | |
| 532 | |
| 533 // Returns an estimate of the survival rate of the region at yg-age | |
| 534 // "yg_age". | |
| 545 | 535 double predict_yg_surv_rate(int age, SurvRateGroup* surv_rate_group) { |
| 536 TruncatedSeq* seq = surv_rate_group->get_seq(age); | |
| 342 | 537 if (seq->num() == 0) |
| 538 gclog_or_tty->print("BARF! age is %d", age); | |
| 539 guarantee( seq->num() > 0, "invariant" ); | |
| 540 double pred = get_new_prediction(seq); | |
| 541 if (pred > 1.0) | |
| 542 pred = 1.0; | |
| 543 return pred; | |
| 544 } | |
| 545 | |
| 545 | 546 double predict_yg_surv_rate(int age) { |
| 547 return predict_yg_surv_rate(age, _short_lived_surv_rate_group); | |
| 548 } | |
| 549 | |
| 342 | 550 double accum_yg_surv_rate_pred(int age) { |
| 551 return _short_lived_surv_rate_group->accum_surv_rate_pred(age); | |
| 552 } | |
| 553 | |
| 4013 | 554 private: |
| 1611 | 555 void print_stats(int level, const char* str, double value); |
| 6059 | 556 void print_stats(int level, const char* str, double value, int workers); |
| 1611 | 557 void print_stats(int level, const char* str, int value); |
| 558 | |
| 6059 | 559 void print_par_stats(int level, const char* str, double* data, bool showDecimals = true); |
| 342 | 560 |
| 561 double avg_value (double* data); | |
| 562 double max_value (double* data); | |
| 563 double sum_of_values (double* data); | |
| 564 double max_sum (double* data1, double* data2); | |
| 565 | |
| 566 double _last_pause_time_ms; | |
| 567 | |
| 568 size_t _bytes_in_collection_set_before_gc; | |
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569 size_t _bytes_copied_during_gc; |
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570 |
| 342 | 571 // Used to count used bytes in CS. |
| 572 friend class CountCSClosure; | |
| 573 | |
| 574 // Statistics kept per GC stoppage, pause or full. | |
| 575 TruncatedSeq* _recent_prev_end_times_for_all_gcs_sec; | |
| 576 | |
| 577 // Add a new GC of the given duration and end time to the record. | |
| 578 void update_recent_gc_times(double end_time_sec, double elapsed_ms); | |
| 579 | |
| 580 // The head of the list (via "next_in_collection_set()") representing the | |
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581 // current collection set. Set from the incrementally built collection |
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582 // set at the start of the pause. |
| 342 | 583 HeapRegion* _collection_set; |
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584 |
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585 // The number of bytes in the collection set before the pause. Set from |
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586 // the incrementally built collection set at the start of an evacuation |
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587 // pause. |
| 342 | 588 size_t _collection_set_bytes_used_before; |
| 589 | |
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590 // The associated information that is maintained while the incremental |
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591 // collection set is being built with young regions. Used to populate |
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592 // the recorded info for the evacuation pause. |
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593 |
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594 enum CSetBuildType { |
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595 Active, // We are actively building the collection set |
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596 Inactive // We are not actively building the collection set |
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597 }; |
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598 |
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599 CSetBuildType _inc_cset_build_state; |
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600 |
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601 // The head of the incrementally built collection set. |
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602 HeapRegion* _inc_cset_head; |
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603 |
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604 // The tail of the incrementally built collection set. |
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605 HeapRegion* _inc_cset_tail; |
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606 |
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607 // The number of bytes in the incrementally built collection set. |
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608 // Used to set _collection_set_bytes_used_before at the start of |
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609 // an evacuation pause. |
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610 size_t _inc_cset_bytes_used_before; |
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611 |
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612 // Used to record the highest end of heap region in collection set |
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613 HeapWord* _inc_cset_max_finger; |
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614 |
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615 // The RSet lengths recorded for regions in the CSet. It is updated |
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616 // by the thread that adds a new region to the CSet. We assume that |
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617 // only one thread can be allocating a new CSet region (currently, |
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618 // it does so after taking the Heap_lock) hence no need to |
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619 // synchronize updates to this field. |
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620 size_t _inc_cset_recorded_rs_lengths; |
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621 |
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622 // A concurrent refinement thread periodcially samples the young |
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623 // region RSets and needs to update _inc_cset_recorded_rs_lengths as |
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624 // the RSets grow. Instead of having to syncronize updates to that |
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625 // field we accumulate them in this field and add it to |
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626 // _inc_cset_recorded_rs_lengths_diffs at the start of a GC. |
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627 ssize_t _inc_cset_recorded_rs_lengths_diffs; |
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628 |
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629 // The predicted elapsed time it will take to collect the regions in |
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630 // the CSet. This is updated by the thread that adds a new region to |
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631 // the CSet. See the comment for _inc_cset_recorded_rs_lengths about |
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632 // MT-safety assumptions. |
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633 double _inc_cset_predicted_elapsed_time_ms; |
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634 |
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635 // See the comment for _inc_cset_recorded_rs_lengths_diffs. |
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636 double _inc_cset_predicted_elapsed_time_ms_diffs; |
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637 |
| 342 | 638 // Stash a pointer to the g1 heap. |
| 639 G1CollectedHeap* _g1; | |
| 640 | |
| 641 // The ratio of gc time to elapsed time, computed over recent pauses. | |
| 642 double _recent_avg_pause_time_ratio; | |
| 643 | |
| 644 double recent_avg_pause_time_ratio() { | |
| 645 return _recent_avg_pause_time_ratio; | |
| 646 } | |
| 647 | |
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648 // At the end of a pause we check the heap occupancy and we decide |
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649 // whether we will start a marking cycle during the next pause. If |
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650 // we decide that we want to do that, we will set this parameter to |
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651 // true. So, this parameter will stay true between the end of a |
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652 // pause and the beginning of a subsequent pause (not necessarily |
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653 // the next one, see the comments on the next field) when we decide |
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654 // that we will indeed start a marking cycle and do the initial-mark |
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655 // work. |
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656 volatile bool _initiate_conc_mark_if_possible; |
| 342 | 657 |
|
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658 // If initiate_conc_mark_if_possible() is set at the beginning of a |
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659 // pause, it is a suggestion that the pause should start a marking |
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660 // cycle by doing the initial-mark work. However, it is possible |
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661 // that the concurrent marking thread is still finishing up the |
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662 // previous marking cycle (e.g., clearing the next marking |
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663 // bitmap). If that is the case we cannot start a new cycle and |
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664 // we'll have to wait for the concurrent marking thread to finish |
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665 // what it is doing. In this case we will postpone the marking cycle |
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666 // initiation decision for the next pause. When we eventually decide |
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667 // to start a cycle, we will set _during_initial_mark_pause which |
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668 // will stay true until the end of the initial-mark pause and it's |
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669 // the condition that indicates that a pause is doing the |
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670 // initial-mark work. |
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671 volatile bool _during_initial_mark_pause; |
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672 |
| 4710 | 673 bool _last_young_gc; |
| 342 | 674 |
| 675 // This set of variables tracks the collector efficiency, in order to | |
| 676 // determine whether we should initiate a new marking. | |
| 677 double _cur_mark_stop_world_time_ms; | |
| 678 double _mark_remark_start_sec; | |
| 679 double _mark_cleanup_start_sec; | |
|
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680 double _root_region_scan_wait_time_ms; |
| 342 | 681 |
|
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682 // Update the young list target length either by setting it to the |
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683 // desired fixed value or by calculating it using G1's pause |
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684 // prediction model. If no rs_lengths parameter is passed, predict |
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685 // the RS lengths using the prediction model, otherwise use the |
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686 // given rs_lengths as the prediction. |
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687 void update_young_list_target_length(size_t rs_lengths = (size_t) -1); |
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688 |
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689 // Calculate and return the minimum desired young list target |
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690 // length. This is the minimum desired young list length according |
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691 // to the user's inputs. |
|
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692 uint calculate_young_list_desired_min_length(uint base_min_length); |
|
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693 |
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694 // Calculate and return the maximum desired young list target |
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695 // length. This is the maximum desired young list length according |
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696 // to the user's inputs. |
|
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697 uint calculate_young_list_desired_max_length(); |
|
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698 |
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699 // Calculate and return the maximum young list target length that |
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700 // can fit into the pause time goal. The parameters are: rs_lengths |
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701 // represent the prediction of how large the young RSet lengths will |
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702 // be, base_min_length is the alreay existing number of regions in |
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703 // the young list, min_length and max_length are the desired min and |
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704 // max young list length according to the user's inputs. |
|
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705 uint calculate_young_list_target_length(size_t rs_lengths, |
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706 uint base_min_length, |
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707 uint desired_min_length, |
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708 uint desired_max_length); |
|
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709 |
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710 // Check whether a given young length (young_length) fits into the |
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711 // given target pause time and whether the prediction for the amount |
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712 // of objects to be copied for the given length will fit into the |
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713 // given free space (expressed by base_free_regions). It is used by |
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714 // calculate_young_list_target_length(). |
|
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715 bool predict_will_fit(uint young_length, double base_time_ms, |
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716 uint base_free_regions, double target_pause_time_ms); |
| 342 | 717 |
| 4013 | 718 // Count the number of bytes used in the CS. |
| 719 void count_CS_bytes_used(); | |
| 720 | |
| 342 | 721 public: |
| 722 | |
| 723 G1CollectorPolicy(); | |
| 724 | |
| 725 virtual G1CollectorPolicy* as_g1_policy() { return this; } | |
| 726 | |
| 727 virtual CollectorPolicy::Name kind() { | |
| 728 return CollectorPolicy::G1CollectorPolicyKind; | |
| 729 } | |
| 730 | |
|
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731 // Check the current value of the young list RSet lengths and |
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732 // compare it against the last prediction. If the current value is |
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733 // higher, recalculate the young list target length prediction. |
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734 void revise_young_list_target_length_if_necessary(); |
| 342 | 735 |
| 736 size_t bytes_in_collection_set() { | |
| 737 return _bytes_in_collection_set_before_gc; | |
| 738 } | |
| 739 | |
|
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740 // This should be called after the heap is resized. |
|
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741 void record_new_heap_size(uint new_number_of_regions); |
|
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742 |
| 4013 | 743 void init(); |
| 342 | 744 |
| 545 | 745 // Create jstat counters for the policy. |
| 746 virtual void initialize_gc_policy_counters(); | |
| 747 | |
| 342 | 748 virtual HeapWord* mem_allocate_work(size_t size, |
| 749 bool is_tlab, | |
| 750 bool* gc_overhead_limit_was_exceeded); | |
| 751 | |
| 752 // This method controls how a collector handles one or more | |
| 753 // of its generations being fully allocated. | |
| 754 virtual HeapWord* satisfy_failed_allocation(size_t size, | |
| 755 bool is_tlab); | |
| 756 | |
| 757 BarrierSet::Name barrier_set_name() { return BarrierSet::G1SATBCTLogging; } | |
| 758 | |
| 759 GenRemSet::Name rem_set_name() { return GenRemSet::CardTable; } | |
| 760 | |
|
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761 bool need_to_start_conc_mark(const char* source, size_t alloc_word_size = 0); |
|
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762 |
| 342 | 763 // Update the heuristic info to record a collection pause of the given |
| 764 // start time, where the given number of bytes were used at the start. | |
| 765 // This may involve changing the desired size of a collection set. | |
| 766 | |
| 4013 | 767 void record_stop_world_start(); |
| 342 | 768 |
| 4013 | 769 void record_collection_pause_start(double start_time_sec, size_t start_used); |
| 342 | 770 |
| 771 // Must currently be called while the world is stopped. | |
|
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772 void record_concurrent_mark_init_end(double |
| 342 | 773 mark_init_elapsed_time_ms); |
| 774 | |
|
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775 void record_root_region_scan_wait_time(double time_ms) { |
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776 _root_region_scan_wait_time_ms = time_ms; |
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777 } |
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778 |
| 4013 | 779 void record_concurrent_mark_remark_start(); |
| 780 void record_concurrent_mark_remark_end(); | |
| 342 | 781 |
| 4013 | 782 void record_concurrent_mark_cleanup_start(); |
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783 void record_concurrent_mark_cleanup_end(int no_of_gc_threads); |
| 4013 | 784 void record_concurrent_mark_cleanup_completed(); |
| 342 | 785 |
| 4013 | 786 void record_concurrent_pause(); |
| 787 void record_concurrent_pause_end(); | |
| 342 | 788 |
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789 void record_collection_pause_end(int no_of_gc_threads); |
|
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790 void print_heap_transition(); |
| 342 | 791 |
| 792 // Record the fact that a full collection occurred. | |
| 4013 | 793 void record_full_collection_start(); |
| 794 void record_full_collection_end(); | |
| 342 | 795 |
| 1611 | 796 void record_gc_worker_start_time(int worker_i, double ms) { |
| 797 _par_last_gc_worker_start_times_ms[worker_i] = ms; | |
| 798 } | |
| 799 | |
| 342 | 800 void record_ext_root_scan_time(int worker_i, double ms) { |
| 801 _par_last_ext_root_scan_times_ms[worker_i] = ms; | |
| 802 } | |
| 803 | |
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804 void record_satb_filtering_time(int worker_i, double ms) { |
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805 _par_last_satb_filtering_times_ms[worker_i] = ms; |
| 342 | 806 } |
| 807 | |
| 808 void record_update_rs_time(int thread, double ms) { | |
| 809 _par_last_update_rs_times_ms[thread] = ms; | |
| 810 } | |
| 811 | |
| 812 void record_update_rs_processed_buffers (int thread, | |
| 813 double processed_buffers) { | |
| 814 _par_last_update_rs_processed_buffers[thread] = processed_buffers; | |
| 815 } | |
| 816 | |
| 817 void record_scan_rs_time(int thread, double ms) { | |
| 818 _par_last_scan_rs_times_ms[thread] = ms; | |
| 819 } | |
| 820 | |
| 821 void reset_obj_copy_time(int thread) { | |
| 822 _par_last_obj_copy_times_ms[thread] = 0.0; | |
| 823 } | |
| 824 | |
| 825 void reset_obj_copy_time() { | |
| 826 reset_obj_copy_time(0); | |
| 827 } | |
| 828 | |
| 829 void record_obj_copy_time(int thread, double ms) { | |
| 830 _par_last_obj_copy_times_ms[thread] += ms; | |
| 831 } | |
| 832 | |
| 1611 | 833 void record_termination(int thread, double ms, size_t attempts) { |
| 834 _par_last_termination_times_ms[thread] = ms; | |
| 835 _par_last_termination_attempts[thread] = (double) attempts; | |
| 342 | 836 } |
| 837 | |
| 1611 | 838 void record_gc_worker_end_time(int worker_i, double ms) { |
| 839 _par_last_gc_worker_end_times_ms[worker_i] = ms; | |
| 342 | 840 } |
| 841 | |
|
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842 void record_pause_time_ms(double ms) { |
| 342 | 843 _last_pause_time_ms = ms; |
| 844 } | |
| 845 | |
| 846 void record_clear_ct_time(double ms) { | |
| 847 _cur_clear_ct_time_ms = ms; | |
| 848 } | |
| 849 | |
| 850 void record_par_time(double ms) { | |
| 851 _cur_collection_par_time_ms = ms; | |
| 852 } | |
| 853 | |
|
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854 void record_code_root_fixup_time(double ms) { |
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855 _cur_collection_code_root_fixup_time_ms = ms; |
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856 } |
|
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857 |
|
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858 void record_ref_proc_time(double ms) { |
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859 _cur_ref_proc_time_ms = ms; |
|
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860 } |
|
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861 |
|
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862 void record_ref_enq_time(double ms) { |
|
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863 _cur_ref_enq_time_ms = ms; |
|
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|
864 } |
|
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|
865 |
|
890
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diff
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|
866 #ifndef PRODUCT |
|
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|
867 void record_cc_clear_time(double ms) { |
|
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868 if (_min_clear_cc_time_ms < 0.0 || ms <= _min_clear_cc_time_ms) |
|
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|
869 _min_clear_cc_time_ms = ms; |
|
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|
870 if (_max_clear_cc_time_ms < 0.0 || ms >= _max_clear_cc_time_ms) |
|
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|
871 _max_clear_cc_time_ms = ms; |
|
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|
872 _cur_clear_cc_time_ms = ms; |
|
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|
873 _cum_clear_cc_time_ms += ms; |
|
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diff
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|
874 _num_cc_clears++; |
|
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diff
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|
875 } |
|
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diff
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|
876 #endif |
|
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|
877 |
|
3830
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|
878 // Record how much space we copied during a GC. This is typically |
|
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|
879 // called when a GC alloc region is being retired. |
|
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|
880 void record_bytes_copied_during_gc(size_t bytes) { |
|
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|
881 _bytes_copied_during_gc += bytes; |
|
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|
882 } |
|
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|
883 |
|
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|
884 // The amount of space we copied during a GC. |
|
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|
885 size_t bytes_copied_during_gc() { |
|
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|
886 return _bytes_copied_during_gc; |
|
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|
887 } |
| 342 | 888 |
|
5972
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|
889 // Determine whether there are candidate regions so that the |
|
9a9bb0010c91
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|
890 // next GC should be mixed. The two action strings are used |
|
9a9bb0010c91
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|
891 // in the ergo output when the method returns true or false. |
|
4912
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|
892 bool next_gc_should_be_mixed(const char* true_action_str, |
|
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|
893 const char* false_action_str); |
|
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|
894 |
| 342 | 895 // Choose a new collection set. Marks the chosen regions as being |
| 896 // "in_collection_set", and links them together. The head and number of | |
| 897 // the collection set are available via access methods. | |
|
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|
898 void finalize_cset(double target_pause_time_ms); |
| 342 | 899 |
| 900 // The head of the list (via "next_in_collection_set()") representing the | |
| 901 // current collection set. | |
| 902 HeapRegion* collection_set() { return _collection_set; } | |
| 903 | |
|
1394
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|
904 void clear_collection_set() { _collection_set = NULL; } |
|
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|
905 |
|
4090
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|
906 // Add old region "hr" to the CSet. |
|
a88de71c4e3a
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|
907 void add_old_region_to_cset(HeapRegion* hr); |
| 342 | 908 |
|
1394
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|
909 // Incremental CSet Support |
|
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|
910 |
|
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|
911 // The head of the incrementally built collection set. |
|
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|
912 HeapRegion* inc_cset_head() { return _inc_cset_head; } |
|
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|
913 |
|
1316cec51b4d
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|
914 // The tail of the incrementally built collection set. |
|
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|
915 HeapRegion* inc_set_tail() { return _inc_cset_tail; } |
|
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|
916 |
|
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|
917 // Initialize incremental collection set info. |
|
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|
918 void start_incremental_cset_building(); |
|
1316cec51b4d
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|
919 |
|
4727
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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changeset
|
920 // Perform any final calculations on the incremental CSet fields |
|
67fdcb391461
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|
921 // before we can use them. |
|
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|
922 void finalize_incremental_cset_building(); |
|
67fdcb391461
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parents:
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|
923 |
|
1394
1316cec51b4d
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|
924 void clear_incremental_cset() { |
|
1316cec51b4d
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|
925 _inc_cset_head = NULL; |
|
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parents:
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|
926 _inc_cset_tail = NULL; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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|
927 } |
|
1316cec51b4d
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diff
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|
928 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
929 // Stop adding regions to the incremental collection set |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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|
930 void stop_incremental_cset_building() { _inc_cset_build_state = Inactive; } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
931 |
|
4727
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
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|
932 // Add information about hr to the aggregated information for the |
|
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
933 // incrementally built collection set. |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
934 void add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
935 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1359
diff
changeset
|
936 // Update information about hr in the aggregated information for |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
937 // the incrementally built collection set. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
938 void update_incremental_cset_info(HeapRegion* hr, size_t new_rs_length); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
939 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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1359
diff
changeset
|
940 private: |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1359
diff
changeset
|
941 // Update the incremental cset information when adding a region |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1359
diff
changeset
|
942 // (should not be called directly). |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
943 void add_region_to_incremental_cset_common(HeapRegion* hr); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1359
diff
changeset
|
944 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1359
diff
changeset
|
945 public: |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1359
diff
changeset
|
946 // Add hr to the LHS of the incremental collection set. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1359
diff
changeset
|
947 void add_region_to_incremental_cset_lhs(HeapRegion* hr); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1359
diff
changeset
|
948 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1359
diff
changeset
|
949 // Add hr to the RHS of the incremental collection set. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1359
diff
changeset
|
950 void add_region_to_incremental_cset_rhs(HeapRegion* hr); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1359
diff
changeset
|
951 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1359
diff
changeset
|
952 #ifndef PRODUCT |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1359
diff
changeset
|
953 void print_collection_set(HeapRegion* list_head, outputStream* st); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1359
diff
changeset
|
954 #endif // !PRODUCT |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1359
diff
changeset
|
955 |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
changeset
|
956 bool initiate_conc_mark_if_possible() { return _initiate_conc_mark_if_possible; } |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
changeset
|
957 void set_initiate_conc_mark_if_possible() { _initiate_conc_mark_if_possible = true; } |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
changeset
|
958 void clear_initiate_conc_mark_if_possible() { _initiate_conc_mark_if_possible = false; } |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
changeset
|
959 |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
changeset
|
960 bool during_initial_mark_pause() { return _during_initial_mark_pause; } |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
changeset
|
961 void set_during_initial_mark_pause() { _during_initial_mark_pause = true; } |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
changeset
|
962 void clear_during_initial_mark_pause(){ _during_initial_mark_pause = false; } |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
changeset
|
963 |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
964 // This sets the initiate_conc_mark_if_possible() flag to start a |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
965 // new cycle, as long as we are not already in one. It's best if it |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
966 // is called during a safepoint when the test whether a cycle is in |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
967 // progress or not is stable. |
|
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
968 bool force_initial_mark_if_outside_cycle(GCCause::Cause gc_cause); |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
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diff
changeset
|
969 |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
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diff
changeset
|
970 // This is called at the very beginning of an evacuation pause (it |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
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changeset
|
971 // has to be the first thing that the pause does). If |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
changeset
|
972 // initiate_conc_mark_if_possible() is true, and the concurrent |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
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diff
changeset
|
973 // marking thread has completed its work during the previous cycle, |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
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diff
changeset
|
974 // it will set during_initial_mark_pause() to so that the pause does |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
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diff
changeset
|
975 // the initial-mark work and start a marking cycle. |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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changeset
|
976 void decide_on_conc_mark_initiation(); |
| 342 | 977 |
| 978 // If an expansion would be appropriate, because recent GC overhead had | |
| 979 // exceeded the desired limit, return an amount to expand by. | |
| 4013 | 980 size_t expansion_amount(); |
| 342 | 981 |
| 982 // Print tracing information. | |
| 983 void print_tracing_info() const; | |
| 984 | |
| 985 // Print stats on young survival ratio | |
| 986 void print_yg_surv_rate_info() const; | |
| 987 | |
| 545 | 988 void finished_recalculating_age_indexes(bool is_survivors) { |
| 989 if (is_survivors) { | |
| 990 _survivor_surv_rate_group->finished_recalculating_age_indexes(); | |
| 991 } else { | |
| 992 _short_lived_surv_rate_group->finished_recalculating_age_indexes(); | |
| 993 } | |
| 342 | 994 // do that for any other surv rate groups |
| 995 } | |
| 996 | |
| 1973 | 997 bool is_young_list_full() { |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
5988
diff
changeset
|
998 uint young_list_length = _g1->young_list()->length(); |
|
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
5988
diff
changeset
|
999 uint young_list_target_length = _young_list_target_length; |
|
1991
016a3628c885
6994056: G1: when GC locker is active, extend the Eden instead of allocating into the old gen
tonyp
parents:
1973
diff
changeset
|
1000 return young_list_length >= young_list_target_length; |
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1001 } |
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1002 |
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1003 bool can_expand_young_list() { |
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1004 uint young_list_length = _g1->young_list()->length(); |
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1005 uint young_list_max_length = _young_list_max_length; |
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1006 return young_list_length < young_list_max_length; |
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1007 } |
| 1973 | 1008 |
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1009 uint young_list_max_length() { |
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1010 return _young_list_max_length; |
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1011 } |
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1012 |
| 4710 | 1013 bool gcs_are_young() { |
| 1014 return _gcs_are_young; | |
| 342 | 1015 } |
| 4710 | 1016 void set_gcs_are_young(bool gcs_are_young) { |
| 1017 _gcs_are_young = gcs_are_young; | |
| 342 | 1018 } |
| 1019 | |
| 1020 bool adaptive_young_list_length() { | |
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1021 return _young_gen_sizer->adaptive_young_list_length(); |
| 342 | 1022 } |
| 1023 | |
| 4013 | 1024 private: |
| 342 | 1025 // |
| 1026 // Survivor regions policy. | |
| 1027 // | |
| 1028 | |
| 1029 // Current tenuring threshold, set to 0 if the collector reaches the | |
| 1030 // maximum amount of suvivors regions. | |
| 1031 int _tenuring_threshold; | |
| 1032 | |
| 545 | 1033 // The limit on the number of regions allocated for survivors. |
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1034 uint _max_survivor_regions; |
| 545 | 1035 |
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1036 // For reporting purposes. |
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1037 size_t _eden_bytes_before_gc; |
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1038 size_t _survivor_bytes_before_gc; |
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1039 size_t _capacity_before_gc; |
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1040 |
| 545 | 1041 // The amount of survor regions after a collection. |
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1042 uint _recorded_survivor_regions; |
| 545 | 1043 // List of survivor regions. |
| 1044 HeapRegion* _recorded_survivor_head; | |
| 1045 HeapRegion* _recorded_survivor_tail; | |
| 1046 | |
| 1047 ageTable _survivors_age_table; | |
| 1048 | |
| 342 | 1049 public: |
| 1050 | |
| 1051 inline GCAllocPurpose | |
| 1052 evacuation_destination(HeapRegion* src_region, int age, size_t word_sz) { | |
| 1053 if (age < _tenuring_threshold && src_region->is_young()) { | |
| 1054 return GCAllocForSurvived; | |
| 1055 } else { | |
| 1056 return GCAllocForTenured; | |
| 1057 } | |
| 1058 } | |
| 1059 | |
| 1060 inline bool track_object_age(GCAllocPurpose purpose) { | |
| 1061 return purpose == GCAllocForSurvived; | |
| 1062 } | |
| 1063 | |
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1064 static const uint REGIONS_UNLIMITED = (uint) -1; |
| 545 | 1065 |
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1066 uint max_regions(int purpose); |
| 342 | 1067 |
| 1068 // The limit on regions for a particular purpose is reached. | |
| 1069 void note_alloc_region_limit_reached(int purpose) { | |
| 1070 if (purpose == GCAllocForSurvived) { | |
| 1071 _tenuring_threshold = 0; | |
| 1072 } | |
| 1073 } | |
| 1074 | |
| 1075 void note_start_adding_survivor_regions() { | |
| 1076 _survivor_surv_rate_group->start_adding_regions(); | |
| 1077 } | |
| 1078 | |
| 1079 void note_stop_adding_survivor_regions() { | |
| 1080 _survivor_surv_rate_group->stop_adding_regions(); | |
| 1081 } | |
| 545 | 1082 |
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1083 void record_survivor_regions(uint regions, |
| 545 | 1084 HeapRegion* head, |
| 1085 HeapRegion* tail) { | |
| 1086 _recorded_survivor_regions = regions; | |
| 1087 _recorded_survivor_head = head; | |
| 1088 _recorded_survivor_tail = tail; | |
| 1089 } | |
| 1090 | |
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1091 uint recorded_survivor_regions() { |
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1092 return _recorded_survivor_regions; |
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1093 } |
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1094 |
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1095 void record_thread_age_table(ageTable* age_table) { |
| 545 | 1096 _survivors_age_table.merge_par(age_table); |
| 1097 } | |
| 1098 | |
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1099 void update_max_gc_locker_expansion(); |
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1100 |
| 545 | 1101 // Calculates survivor space parameters. |
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1102 void update_survivors_policy(); |
| 545 | 1103 |
| 342 | 1104 }; |
| 1105 | |
| 1106 // This should move to some place more general... | |
| 1107 | |
| 1108 // If we have "n" measurements, and we've kept track of their "sum" and the | |
| 1109 // "sum_of_squares" of the measurements, this returns the variance of the | |
| 1110 // sequence. | |
| 1111 inline double variance(int n, double sum_of_squares, double sum) { | |
| 1112 double n_d = (double)n; | |
| 1113 double avg = sum/n_d; | |
| 1114 return (sum_of_squares - 2.0 * avg * sum + n_d * avg * avg) / n_d; | |
| 1115 } | |
| 1116 | |
| 1972 | 1117 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTORPOLICY_HPP |