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1 /*
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2 * Copyright 2002-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 #include "incls/_precompiled.incl"
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26 #include "incls/_psTasks.cpp.incl"
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27
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28 //
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29 // ScavengeRootsTask
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30 //
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31
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32 // Define before use
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33 class PSScavengeRootsClosure: public OopClosure {
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34 private:
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35 PSPromotionManager* _promotion_manager;
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36
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37 public:
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38 PSScavengeRootsClosure(PSPromotionManager* pm) : _promotion_manager(pm) { }
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39
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40 virtual void do_oop(oop* p) {
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41 if (PSScavenge::should_scavenge(*p)) {
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42 // We never card mark roots, maybe call a func without test?
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43 PSScavenge::copy_and_push_safe_barrier(_promotion_manager, p);
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44 }
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45 }
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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(Universe::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
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54 switch (_root_type) {
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55 case universe:
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56 Universe::oops_do(&roots_closure);
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57 ReferenceProcessor::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 Threads::oops_do(&roots_closure);
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68 }
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69 break;
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70
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71 case object_synchronizer:
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72 ObjectSynchronizer::oops_do(&roots_closure);
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73 break;
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74
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75 case flat_profiler:
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76 FlatProfiler::oops_do(&roots_closure);
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77 break;
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78
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79 case system_dictionary:
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80 SystemDictionary::oops_do(&roots_closure);
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81 break;
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82
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83 case management:
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84 Management::oops_do(&roots_closure);
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85 break;
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86
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87 case jvmti:
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88 JvmtiExport::oops_do(&roots_closure);
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89 break;
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90
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91 default:
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92 fatal("Unknown root type");
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93 }
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94
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95 // Do the real work
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96 pm->drain_stacks(false);
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97 }
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98
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99 //
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100 // ThreadRootsTask
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101 //
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102
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103 void ThreadRootsTask::do_it(GCTaskManager* manager, uint which) {
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104 assert(Universe::heap()->is_gc_active(), "called outside gc");
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105
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106 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
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107 PSScavengeRootsClosure roots_closure(pm);
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108
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109 if (_java_thread != NULL)
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110 _java_thread->oops_do(&roots_closure);
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111
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112 if (_vm_thread != NULL)
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113 _vm_thread->oops_do(&roots_closure);
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114
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115 // Do the real work
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116 pm->drain_stacks(false);
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117 }
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118
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119 //
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120 // StealTask
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121 //
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122
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123 StealTask::StealTask(ParallelTaskTerminator* t) :
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124 _terminator(t) {}
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125
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126 void StealTask::do_it(GCTaskManager* manager, uint which) {
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127 assert(Universe::heap()->is_gc_active(), "called outside gc");
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128
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129 PSPromotionManager* pm =
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130 PSPromotionManager::gc_thread_promotion_manager(which);
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131 pm->drain_stacks(true);
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132 guarantee(pm->stacks_empty(),
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133 "stacks should be empty at this point");
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134
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135 int random_seed = 17;
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136 if (pm->depth_first()) {
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137 while(true) {
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138 oop* p;
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139 if (PSPromotionManager::steal_depth(which, &random_seed, p)) {
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140 #if PS_PM_STATS
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141 pm->increment_steals(p);
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142 #endif // PS_PM_STATS
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143 pm->process_popped_location_depth(p);
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144 pm->drain_stacks_depth(true);
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145 } else {
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146 if (terminator()->offer_termination()) {
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147 break;
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148 }
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149 }
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150 }
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151 } else {
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152 while(true) {
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153 oop obj;
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154 if (PSPromotionManager::steal_breadth(which, &random_seed, obj)) {
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155 #if PS_PM_STATS
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156 pm->increment_steals();
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157 #endif // PS_PM_STATS
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158 obj->copy_contents(pm);
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159 pm->drain_stacks_breadth(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 }
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167 guarantee(pm->stacks_empty(),
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168 "stacks should be empty at this point");
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169 }
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170
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171 //
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172 // SerialOldToYoungRootsTask
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173 //
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174
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175 void SerialOldToYoungRootsTask::do_it(GCTaskManager* manager, uint which) {
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176 assert(_gen != NULL, "Sanity");
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177 assert(_gen->object_space()->contains(_gen_top) || _gen_top == _gen->object_space()->top(), "Sanity");
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178
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179 {
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180 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
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181
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182 assert(Universe::heap()->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
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183 CardTableExtension* card_table = (CardTableExtension *)Universe::heap()->barrier_set();
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184 // FIX ME! Assert that card_table is the type we believe it to be.
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185
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186 card_table->scavenge_contents(_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
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191 // Do the real work
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192 pm->drain_stacks(false);
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193 }
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194 }
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195
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196 //
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197 // OldToYoungRootsTask
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198 //
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199
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200 void OldToYoungRootsTask::do_it(GCTaskManager* manager, uint which) {
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201 assert(_gen != NULL, "Sanity");
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202 assert(_gen->object_space()->contains(_gen_top) || _gen_top == _gen->object_space()->top(), "Sanity");
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203 assert(_stripe_number < ParallelGCThreads, "Sanity");
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204
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205 {
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206 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
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207
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208 assert(Universe::heap()->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
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209 CardTableExtension* card_table = (CardTableExtension *)Universe::heap()->barrier_set();
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210 // FIX ME! Assert that card_table is the type we believe it to be.
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211
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212 card_table->scavenge_contents_parallel(_gen->start_array(),
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213 _gen->object_space(),
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214 _gen_top,
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215 pm,
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216 _stripe_number);
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217
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218 // Do the real work
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219 pm->drain_stacks(false);
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220 }
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221 }
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