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annotate src/share/vm/gc_implementation/parallelScavenge/psTasks.hpp @ 6735:aed758eda82a

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7195833: NPG: Rename instanceClassLoaderKlass, instanceRefKlass and instanceMirrorKlass Summary: Simple renaming to be consistent with instanceKlass->InstanceKlass renaming Reviewed-by: stefank, jmasa
author coleenp
date Fri, 07 Sep 2012 12:04:16 -0400
parents bca17e38de00
children f81a7c0c618d
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1 /*
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2 * Copyright (c) 2002, 2010, 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 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSTASKS_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSTASKS_HPP
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27
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28 #include "memory/allocation.hpp"
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29 #include "utilities/growableArray.hpp"
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30
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31 //
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32 // psTasks.hpp is a collection of GCTasks used by the
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33 // parallelScavenge collector.
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34 //
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35
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36 class GCTask;
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37 class OopClosure;
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38 class OopStack;
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39 class ObjectStartArray;
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40 class ParallelTaskTerminator;
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41 class MutableSpace;
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42 class PSOldGen;
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43 class Thread;
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44 class VMThread;
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45
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46 //
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47 // ScavengeRootsTask
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48 //
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49 // This task scans all the roots of a given type.
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50 //
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51 //
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52
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53 class ScavengeRootsTask : public GCTask {
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54 public:
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55 enum RootType {
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56 universe = 1,
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57 jni_handles = 2,
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58 threads = 3,
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59 object_synchronizer = 4,
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60 flat_profiler = 5,
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61 system_dictionary = 6,
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62 management = 7,
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63 jvmti = 8,
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64 code_cache = 9
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65 };
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66 private:
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67 RootType _root_type;
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68 public:
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69 ScavengeRootsTask(RootType value) : _root_type(value) {}
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70
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71 char* name() { return (char *)"scavenge-roots-task"; }
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72
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73 virtual void do_it(GCTaskManager* manager, uint which);
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74 };
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75
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76 //
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77 // ThreadRootsTask
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78 //
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79 // This task scans the roots of a single thread. This task
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80 // enables scanning of thread roots in parallel.
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81 //
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82
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83 class ThreadRootsTask : public GCTask {
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84 private:
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85 JavaThread* _java_thread;
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86 VMThread* _vm_thread;
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87 public:
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88 ThreadRootsTask(JavaThread* root) : _java_thread(root), _vm_thread(NULL) {}
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89 ThreadRootsTask(VMThread* root) : _java_thread(NULL), _vm_thread(root) {}
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90
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91 char* name() { return (char *)"thread-roots-task"; }
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92
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93 virtual void do_it(GCTaskManager* manager, uint which);
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94 };
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95
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96 //
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97 // StealTask
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98 //
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99 // This task is used to distribute work to idle threads.
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100 //
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101
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102 class StealTask : public GCTask {
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103 private:
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104 ParallelTaskTerminator* const _terminator;
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105 public:
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106 char* name() { return (char *)"steal-task"; }
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107
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108 StealTask(ParallelTaskTerminator* t);
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109
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110 ParallelTaskTerminator* terminator() { return _terminator; }
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111
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112 virtual void do_it(GCTaskManager* manager, uint which);
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113 };
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114
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115 //
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116 // SerialOldToYoungRootsTask
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117 //
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118 // This task is used to scan for roots in the perm gen
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119
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120 class SerialOldToYoungRootsTask : public GCTask {
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121 private:
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122 PSOldGen* _gen;
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123 HeapWord* _gen_top;
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124
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125 public:
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126 SerialOldToYoungRootsTask(PSOldGen *gen, HeapWord* gen_top) :
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127 _gen(gen), _gen_top(gen_top) { }
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128
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129 char* name() { return (char *)"serial-old-to-young-roots-task"; }
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130
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131 virtual void do_it(GCTaskManager* manager, uint which);
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132 };
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133
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134 //
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135 // OldToYoungRootsTask
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136 //
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137 // This task is used to scan old to young roots in parallel
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138 //
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139 // A GC thread executing this tasks divides the generation (old gen)
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140 // into slices and takes a stripe in the slice as its part of the
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141 // work.
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142 //
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143 // +===============+ slice 0
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144 // | stripe 0 |
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145 // +---------------+
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146 // | stripe 1 |
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147 // +---------------+
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148 // | stripe 2 |
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149 // +---------------+
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150 // | stripe 3 |
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151 // +===============+ slice 1
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152 // | stripe 0 |
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153 // +---------------+
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154 // | stripe 1 |
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155 // +---------------+
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156 // | stripe 2 |
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157 // +---------------+
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158 // | stripe 3 |
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159 // +===============+ slice 2
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160 // ...
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161 //
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162 // A task is created for each stripe. In this case there are 4 tasks
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163 // created. A GC thread first works on its stripe within slice 0
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164 // and then moves to its stripe in the next slice until all stripes
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165 // exceed the top of the generation. Note that having fewer GC threads
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166 // than stripes works because all the tasks are executed so all stripes
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167 // will be covered. In this example if 4 tasks have been created to cover
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168 // all the stripes and there are only 3 threads, one of the threads will
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169 // get the tasks with the 4th stripe. However, there is a dependence in
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170 // CardTableExtension::scavenge_contents_parallel() on the number
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171 // of tasks created. In scavenge_contents_parallel the distance
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172 // to the next stripe is calculated based on the number of tasks.
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173 // If the stripe width is ssize, a task's next stripe is at
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174 // ssize * number_of_tasks (= slice_stride). In this case after
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175 // finishing stripe 0 in slice 0, the thread finds the stripe 0 in slice1
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176 // by adding slice_stride to the start of stripe 0 in slice 0 to get
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177 // to the start of stride 0 in slice 1.
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178
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179 class OldToYoungRootsTask : public GCTask {
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180 private:
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181 PSOldGen* _gen;
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182 HeapWord* _gen_top;
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183 uint _stripe_number;
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184 uint _stripe_total;
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185
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186 public:
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187 OldToYoungRootsTask(PSOldGen *gen,
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188 HeapWord* gen_top,
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189 uint stripe_number,
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190 uint stripe_total) :
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191 _gen(gen),
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192 _gen_top(gen_top),
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193 _stripe_number(stripe_number),
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194 _stripe_total(stripe_total) { }
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195
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196 char* name() { return (char *)"old-to-young-roots-task"; }
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197
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198 virtual void do_it(GCTaskManager* manager, uint which);
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199 };
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200
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201 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSTASKS_HPP