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1 /* |
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2 * Copyright (c) 2002, 2015, 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 "classfile/systemDictionary.hpp" |
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27 #include "code/codeCache.hpp" |
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28 #include "gc/parallel/cardTableExtension.hpp" |
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29 #include "gc/parallel/gcTaskManager.hpp" |
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30 #include "gc/parallel/psMarkSweep.hpp" |
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31 #include "gc/parallel/psPromotionManager.hpp" |
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32 #include "gc/parallel/psPromotionManager.inline.hpp" |
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33 #include "gc/parallel/psScavenge.inline.hpp" |
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34 #include "gc/parallel/psTasks.hpp" |
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35 #include "gc/shared/taskqueue.inline.hpp" |
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36 #include "memory/iterator.hpp" |
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37 #include "memory/universe.hpp" |
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38 #include "oops/oop.inline.hpp" |
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39 #include "runtime/fprofiler.hpp" |
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40 #include "runtime/thread.hpp" |
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41 #include "runtime/vmThread.hpp" |
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42 #include "services/management.hpp" |
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43 |
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44 // |
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45 // ScavengeRootsTask |
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46 // |
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47 |
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48 void ScavengeRootsTask::do_it(GCTaskManager* manager, uint which) { |
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49 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); |
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50 |
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51 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which); |
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52 PSScavengeRootsClosure roots_closure(pm); |
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53 PSPromoteRootsClosure roots_to_old_closure(pm); |
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54 |
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55 switch (_root_type) { |
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56 case universe: |
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57 Universe::oops_do(&roots_closure); |
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58 break; |
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59 |
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60 case jni_handles: |
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61 JNIHandles::oops_do(&roots_closure); |
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62 break; |
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63 |
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64 case threads: |
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65 { |
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66 ResourceMark rm; |
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67 CLDClosure* cld_closure = NULL; // Not needed. All CLDs are already visited. |
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68 Threads::oops_do(&roots_closure, cld_closure, NULL); |
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69 } |
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70 break; |
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71 |
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72 case object_synchronizer: |
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73 ObjectSynchronizer::oops_do(&roots_closure); |
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74 break; |
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75 |
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76 case flat_profiler: |
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77 FlatProfiler::oops_do(&roots_closure); |
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78 break; |
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79 |
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80 case system_dictionary: |
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81 SystemDictionary::oops_do(&roots_closure); |
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82 break; |
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83 |
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84 case class_loader_data: |
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85 { |
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86 PSScavengeKlassClosure klass_closure(pm); |
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87 ClassLoaderDataGraph::oops_do(&roots_closure, &klass_closure, false); |
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88 } |
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89 break; |
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90 |
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91 case management: |
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92 Management::oops_do(&roots_closure); |
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93 break; |
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94 |
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95 case jvmti: |
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96 JvmtiExport::oops_do(&roots_closure); |
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97 break; |
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98 |
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99 |
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100 case code_cache: |
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101 { |
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102 MarkingCodeBlobClosure each_scavengable_code_blob(&roots_to_old_closure, CodeBlobToOopClosure::FixRelocations); |
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103 CodeCache::scavenge_root_nmethods_do(&each_scavengable_code_blob); |
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104 } |
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105 break; |
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106 |
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107 default: |
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108 fatal("Unknown root type"); |
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109 } |
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110 |
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111 // Do the real work |
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112 pm->drain_stacks(false); |
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113 } |
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114 |
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115 // |
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116 // ThreadRootsTask |
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117 // |
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118 |
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119 void ThreadRootsTask::do_it(GCTaskManager* manager, uint which) { |
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120 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); |
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121 |
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122 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which); |
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123 PSScavengeRootsClosure roots_closure(pm); |
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124 CLDClosure* roots_from_clds = NULL; // Not needed. All CLDs are already visited. |
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125 MarkingCodeBlobClosure roots_in_blobs(&roots_closure, CodeBlobToOopClosure::FixRelocations); |
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126 |
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127 if (_java_thread != NULL) |
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128 _java_thread->oops_do(&roots_closure, roots_from_clds, &roots_in_blobs); |
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129 |
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130 if (_vm_thread != NULL) |
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131 _vm_thread->oops_do(&roots_closure, roots_from_clds, &roots_in_blobs); |
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132 |
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133 // Do the real work |
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134 pm->drain_stacks(false); |
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135 } |
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136 |
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137 // |
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138 // StealTask |
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139 // |
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140 |
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141 StealTask::StealTask(ParallelTaskTerminator* t) : |
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142 _terminator(t) {} |
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143 |
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144 void StealTask::do_it(GCTaskManager* manager, uint which) { |
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145 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); |
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146 |
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147 PSPromotionManager* pm = |
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148 PSPromotionManager::gc_thread_promotion_manager(which); |
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149 pm->drain_stacks(true); |
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150 guarantee(pm->stacks_empty(), |
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151 "stacks should be empty at this point"); |
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152 |
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153 int random_seed = 17; |
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154 while(true) { |
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155 StarTask p; |
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156 if (PSPromotionManager::steal_depth(which, &random_seed, p)) { |
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157 TASKQUEUE_STATS_ONLY(pm->record_steal(p)); |
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158 pm->process_popped_location_depth(p); |
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159 pm->drain_stacks_depth(true); |
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160 } else { |
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161 if (terminator()->offer_termination()) { |
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162 break; |
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163 } |
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164 } |
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165 } |
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166 guarantee(pm->stacks_empty(), "stacks should be empty at this point"); |
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167 } |
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168 |
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169 // |
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170 // OldToYoungRootsTask |
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171 // |
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172 |
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173 void OldToYoungRootsTask::do_it(GCTaskManager* manager, uint which) { |
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174 // There are not old-to-young pointers if the old gen is empty. |
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175 assert(!_gen->object_space()->is_empty(), |
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176 "Should not be called is there is no work"); |
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177 assert(_gen != NULL, "Sanity"); |
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178 assert(_gen->object_space()->contains(_gen_top) || _gen_top == _gen->object_space()->top(), "Sanity"); |
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179 assert(_stripe_number < ParallelGCThreads, "Sanity"); |
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180 |
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181 { |
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182 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which); |
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183 CardTableExtension* card_table = |
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184 barrier_set_cast<CardTableExtension>(ParallelScavengeHeap::heap()->barrier_set()); |
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185 |
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186 card_table->scavenge_contents_parallel(_gen->start_array(), |
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187 _gen->object_space(), |
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188 _gen_top, |
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189 pm, |
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190 _stripe_number, |
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191 _stripe_total); |
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192 |
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193 // Do the real work |
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194 pm->drain_stacks(false); |
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195 } |
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196 } |