1 /* |
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2 * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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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. |
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22 * |
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23 */ |
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24 |
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25 #include "precompiled.hpp" |
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26 #include "gc/cms/jvmFlagConstraintsCMS.hpp" |
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27 #include "gc/cms/concurrentMarkSweepGeneration.inline.hpp" |
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28 #include "gc/shared/cardTableRS.hpp" |
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29 #include "gc/shared/collectedHeap.hpp" |
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30 #include "gc/shared/genCollectedHeap.hpp" |
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31 #include "gc/shared/jvmFlagConstraintsGC.hpp" |
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32 #include "memory/universe.hpp" |
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33 #include "runtime/globals_extension.hpp" |
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34 #include "utilities/globalDefinitions.hpp" |
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35 |
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36 static JVMFlag::Error ParallelGCThreadsAndCMSWorkQueueDrainThreshold(uint threads, uintx threshold, bool verbose) { |
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37 // CMSWorkQueueDrainThreshold is verified to be less than max_juint |
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38 if (UseConcMarkSweepGC && (threads > (uint)(max_jint / (uint)threshold))) { |
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39 JVMFlag::printError(verbose, |
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40 "ParallelGCThreads (" UINT32_FORMAT ") or CMSWorkQueueDrainThreshold (" |
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41 UINTX_FORMAT ") is too large\n", |
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42 threads, threshold); |
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43 return JVMFlag::VIOLATES_CONSTRAINT; |
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44 } |
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45 return JVMFlag::SUCCESS; |
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46 } |
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47 |
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48 JVMFlag::Error ParallelGCThreadsConstraintFuncCMS(uint value, bool verbose) { |
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49 // To avoid overflow at ParScanClosure::do_oop_work. |
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50 if (UseConcMarkSweepGC && (value > (max_jint / 10))) { |
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51 JVMFlag::printError(verbose, |
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52 "ParallelGCThreads (" UINT32_FORMAT ") must be " |
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53 "less than or equal to " UINT32_FORMAT " for CMS GC\n", |
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54 value, (max_jint / 10)); |
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55 return JVMFlag::VIOLATES_CONSTRAINT; |
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56 } |
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57 return ParallelGCThreadsAndCMSWorkQueueDrainThreshold(value, CMSWorkQueueDrainThreshold, verbose); |
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58 } |
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59 JVMFlag::Error ParGCStridesPerThreadConstraintFunc(uintx value, bool verbose) { |
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60 if (UseConcMarkSweepGC && (value > ((uintx)max_jint / (uintx)ParallelGCThreads))) { |
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61 JVMFlag::printError(verbose, |
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62 "ParGCStridesPerThread (" UINTX_FORMAT ") must be " |
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63 "less than or equal to ergonomic maximum (" UINTX_FORMAT ")\n", |
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64 value, ((uintx)max_jint / (uintx)ParallelGCThreads)); |
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65 return JVMFlag::VIOLATES_CONSTRAINT; |
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66 } |
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67 return JVMFlag::SUCCESS; |
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68 } |
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69 |
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70 JVMFlag::Error ParGCCardsPerStrideChunkConstraintFunc(intx value, bool verbose) { |
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71 if (UseConcMarkSweepGC) { |
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72 // ParGCCardsPerStrideChunk should be compared with card table size. |
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73 size_t heap_size = CMSHeap::heap()->reserved_region().word_size(); |
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74 CardTableRS* ct = GenCollectedHeap::heap()->rem_set(); |
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75 size_t card_table_size = ct->cards_required(heap_size) - 1; // Valid card table size |
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76 |
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77 if ((size_t)value > card_table_size) { |
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78 JVMFlag::printError(verbose, |
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79 "ParGCCardsPerStrideChunk (" INTX_FORMAT ") is too large for the heap size and " |
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80 "must be less than or equal to card table size (" SIZE_FORMAT ")\n", |
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81 value, card_table_size); |
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82 return JVMFlag::VIOLATES_CONSTRAINT; |
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83 } |
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84 |
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85 // ParGCCardsPerStrideChunk is used with n_strides(ParallelGCThreads*ParGCStridesPerThread) |
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86 // from CardTableRS::process_stride(). Note that ParGCStridesPerThread is already checked |
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87 // not to make an overflow with ParallelGCThreads from its constraint function. |
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88 uintx n_strides = ParallelGCThreads * ParGCStridesPerThread; |
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89 uintx ergo_max = max_uintx / n_strides; |
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90 if ((uintx)value > ergo_max) { |
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91 JVMFlag::printError(verbose, |
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92 "ParGCCardsPerStrideChunk (" INTX_FORMAT ") must be " |
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93 "less than or equal to ergonomic maximum (" UINTX_FORMAT ")\n", |
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94 value, ergo_max); |
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95 return JVMFlag::VIOLATES_CONSTRAINT; |
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96 } |
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97 } |
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98 return JVMFlag::SUCCESS; |
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99 } |
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100 |
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101 JVMFlag::Error CMSOldPLABMinConstraintFunc(size_t value, bool verbose) { |
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102 JVMFlag::Error status = JVMFlag::SUCCESS; |
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103 |
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104 if (UseConcMarkSweepGC) { |
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105 if (value > CMSOldPLABMax) { |
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106 JVMFlag::printError(verbose, |
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107 "CMSOldPLABMin (" SIZE_FORMAT ") must be " |
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108 "less than or equal to CMSOldPLABMax (" SIZE_FORMAT ")\n", |
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109 value, CMSOldPLABMax); |
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110 return JVMFlag::VIOLATES_CONSTRAINT; |
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111 } |
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112 status = MaxPLABSizeBounds("CMSOldPLABMin", value, verbose); |
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113 } |
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114 return status; |
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115 } |
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116 |
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117 JVMFlag::Error CMSOldPLABMaxConstraintFunc(size_t value, bool verbose) { |
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118 JVMFlag::Error status = JVMFlag::SUCCESS; |
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119 |
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120 if (UseConcMarkSweepGC) { |
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121 status = MaxPLABSizeBounds("CMSOldPLABMax", value, verbose); |
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122 } |
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123 return status; |
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124 } |
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125 |
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126 static JVMFlag::Error CMSReservedAreaConstraintFunc(const char* name, size_t value, bool verbose) { |
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127 if (UseConcMarkSweepGC) { |
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128 ConcurrentMarkSweepGeneration* cms = CMSHeap::heap()->old_gen(); |
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129 const size_t ergo_max = cms->cmsSpace()->max_flag_size_for_task_size(); |
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130 if (value > ergo_max) { |
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131 JVMFlag::printError(verbose, |
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132 "%s (" SIZE_FORMAT ") must be " |
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133 "less than or equal to ergonomic maximum (" SIZE_FORMAT ") " |
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134 "which is based on the maximum size of the old generation of the Java heap\n", |
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135 name, value, ergo_max); |
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136 return JVMFlag::VIOLATES_CONSTRAINT; |
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137 } |
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138 } |
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139 return JVMFlag::SUCCESS; |
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140 } |
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141 |
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142 JVMFlag::Error CMSRescanMultipleConstraintFunc(size_t value, bool verbose) { |
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143 JVMFlag::Error status = CMSReservedAreaConstraintFunc("CMSRescanMultiple", value, verbose); |
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144 |
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145 if (status == JVMFlag::SUCCESS && UseConcMarkSweepGC) { |
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146 // CMSParRemarkTask::do_dirty_card_rescan_tasks requires CompactibleFreeListSpace::rescan_task_size() |
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147 // to be aligned to CardTable::card_size * BitsPerWord. |
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148 // Note that rescan_task_size() will be aligned if CMSRescanMultiple is a multiple of 'HeapWordSize' |
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149 // because rescan_task_size() is CardTable::card_size / HeapWordSize * BitsPerWord. |
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150 if (value % HeapWordSize != 0) { |
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151 JVMFlag::printError(verbose, |
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152 "CMSRescanMultiple (" SIZE_FORMAT ") must be " |
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153 "a multiple of %d\n", |
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154 value, HeapWordSize); |
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155 status = JVMFlag::VIOLATES_CONSTRAINT; |
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156 } |
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157 } |
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158 return status; |
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159 } |
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160 |
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161 JVMFlag::Error CMSConcMarkMultipleConstraintFunc(size_t value, bool verbose) { |
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162 return CMSReservedAreaConstraintFunc("CMSConcMarkMultiple", value, verbose); |
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163 } |
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164 |
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165 JVMFlag::Error CMSPrecleanDenominatorConstraintFunc(uintx value, bool verbose) { |
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166 if (UseConcMarkSweepGC && (value <= CMSPrecleanNumerator)) { |
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167 JVMFlag::printError(verbose, |
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168 "CMSPrecleanDenominator (" UINTX_FORMAT ") must be " |
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169 "strickly greater than CMSPrecleanNumerator (" UINTX_FORMAT ")\n", |
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170 value, CMSPrecleanNumerator); |
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171 return JVMFlag::VIOLATES_CONSTRAINT; |
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172 } |
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173 return JVMFlag::SUCCESS; |
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174 } |
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175 |
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176 JVMFlag::Error CMSPrecleanNumeratorConstraintFunc(uintx value, bool verbose) { |
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177 if (UseConcMarkSweepGC && (value >= CMSPrecleanDenominator)) { |
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178 JVMFlag::printError(verbose, |
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179 "CMSPrecleanNumerator (" UINTX_FORMAT ") must be " |
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180 "less than CMSPrecleanDenominator (" UINTX_FORMAT ")\n", |
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181 value, CMSPrecleanDenominator); |
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182 return JVMFlag::VIOLATES_CONSTRAINT; |
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183 } |
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184 return JVMFlag::SUCCESS; |
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185 } |
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186 |
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187 JVMFlag::Error CMSSamplingGrainConstraintFunc(uintx value, bool verbose) { |
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188 if (UseConcMarkSweepGC) { |
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189 size_t max_capacity = CMSHeap::heap()->young_gen()->max_capacity(); |
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190 if (value > max_uintx - max_capacity) { |
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191 JVMFlag::printError(verbose, |
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192 "CMSSamplingGrain (" UINTX_FORMAT ") must be " |
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193 "less than or equal to ergonomic maximum (" SIZE_FORMAT ")\n", |
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194 value, max_uintx - max_capacity); |
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195 return JVMFlag::VIOLATES_CONSTRAINT; |
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196 } |
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197 } |
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198 return JVMFlag::SUCCESS; |
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199 } |
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200 |
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201 JVMFlag::Error CMSWorkQueueDrainThresholdConstraintFunc(uintx value, bool verbose) { |
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202 if (UseConcMarkSweepGC) { |
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203 return ParallelGCThreadsAndCMSWorkQueueDrainThreshold(ParallelGCThreads, value, verbose); |
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204 } |
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205 return JVMFlag::SUCCESS; |
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206 } |
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207 |
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208 JVMFlag::Error CMSBitMapYieldQuantumConstraintFunc(size_t value, bool verbose) { |
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209 // Skip for current default value. |
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210 if (UseConcMarkSweepGC && FLAG_IS_CMDLINE(CMSBitMapYieldQuantum)) { |
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211 // CMSBitMapYieldQuantum should be compared with mark bitmap size. |
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212 ConcurrentMarkSweepGeneration* cms = CMSHeap::heap()->old_gen(); |
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213 size_t bitmap_size = cms->collector()->markBitMap()->sizeInWords(); |
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214 |
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215 if (value > bitmap_size) { |
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216 JVMFlag::printError(verbose, |
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217 "CMSBitMapYieldQuantum (" SIZE_FORMAT ") must " |
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218 "be less than or equal to bitmap size (" SIZE_FORMAT ") " |
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219 "whose size corresponds to the size of old generation of the Java heap\n", |
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220 value, bitmap_size); |
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221 return JVMFlag::VIOLATES_CONSTRAINT; |
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222 } |
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223 } |
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224 return JVMFlag::SUCCESS; |
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225 } |
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226 |
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227 JVMFlag::Error OldPLABSizeConstraintFuncCMS(size_t value, bool verbose) { |
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228 if (value == 0) { |
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229 JVMFlag::printError(verbose, |
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230 "OldPLABSize (" SIZE_FORMAT ") must be greater than 0", |
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231 value); |
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232 return JVMFlag::VIOLATES_CONSTRAINT; |
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233 } |
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234 // For CMS, OldPLABSize is the number of free blocks of a given size that are used when |
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235 // replenishing the local per-worker free list caches. |
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236 // For more details, please refer to Arguments::set_cms_and_parnew_gc_flags(). |
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237 return MaxPLABSizeBounds("OldPLABSize", value, verbose); |
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238 } |
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