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annotate src/share/vm/gc_implementation/parallelScavenge/psCompactionManager.hpp @ 6197:d2a62e0f25eb

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6995781: Native Memory Tracking (Phase 1) 7151532: DCmd for hotspot native memory tracking Summary: Implementation of native memory tracking phase 1, which tracks VM native memory usage, and related DCmd Reviewed-by: acorn, coleenp, fparain
author zgu
date Thu, 28 Jun 2012 17:03:16 -0400
parents 7913e93dca52
children da91efe96a93
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1 /*
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2 * Copyright (c) 2005, 2011, 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_PSCOMPACTIONMANAGER_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSCOMPACTIONMANAGER_HPP
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27
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28 #include "memory/allocation.hpp"
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29 #include "utilities/stack.hpp"
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30 #include "utilities/taskqueue.hpp"
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31
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32 // Move to some global location
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33 #define HAS_BEEN_MOVED 0x1501d01d
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34 // End move to some global location
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35
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36
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37 class MutableSpace;
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38 class PSOldGen;
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39 class ParCompactionManager;
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40 class ObjectStartArray;
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41 class ParallelCompactData;
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42 class ParMarkBitMap;
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43
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44 class ParCompactionManager : public CHeapObj<mtGC> {
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45 friend class ParallelTaskTerminator;
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46 friend class ParMarkBitMap;
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47 friend class PSParallelCompact;
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48 friend class StealRegionCompactionTask;
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49 friend class UpdateAndFillClosure;
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50 friend class RefProcTaskExecutor;
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51 friend class IdleGCTask;
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52
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53 public:
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54
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55 // ------------------------ Don't putback if not needed
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56 // Actions that the compaction manager should take.
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57 enum Action {
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58 Update,
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59 Copy,
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60 UpdateAndCopy,
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61 CopyAndUpdate,
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62 NotValid
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63 };
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64 // ------------------------ End don't putback if not needed
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65
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66 private:
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67 // 32-bit: 4K * 8 = 32KiB; 64-bit: 8K * 16 = 128KiB
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68 #define QUEUE_SIZE (1 << NOT_LP64(12) LP64_ONLY(13))
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69 typedef OverflowTaskQueue<ObjArrayTask, mtGC, QUEUE_SIZE> ObjArrayTaskQueue;
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70 typedef GenericTaskQueueSet<ObjArrayTaskQueue, mtGC> ObjArrayTaskQueueSet;
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71 #undef QUEUE_SIZE
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72
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73 static ParCompactionManager** _manager_array;
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74 static OopTaskQueueSet* _stack_array;
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75 static ObjArrayTaskQueueSet* _objarray_queues;
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76 static ObjectStartArray* _start_array;
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77 static RegionTaskQueueSet* _region_array;
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78 static PSOldGen* _old_gen;
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79
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80 private:
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81 OverflowTaskQueue<oop, mtGC> _marking_stack;
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82 ObjArrayTaskQueue _objarray_stack;
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83
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84 // Is there a way to reuse the _marking_stack for the
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85 // saving empty regions? For now just create a different
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86 // type of TaskQueue.
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87 RegionTaskQueue* _region_stack;
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88
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89 static RegionTaskQueue** _region_list;
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90 // Index in _region_list for current _region_stack.
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91 uint _region_stack_index;
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92
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93 // Indexes of recycled region stacks/overflow stacks
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94 // Stacks of regions to be compacted are embedded in the tasks doing
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95 // the compaction. A thread that executes the task extracts the
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96 // region stack and drains it. These threads keep these region
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97 // stacks for use during compaction task stealing. If a thread
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98 // gets a second draining task, it pushed its current region stack
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99 // index into the array _recycled_stack_index and gets a new
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100 // region stack from the task. A thread that is executing a
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101 // compaction stealing task without ever having executing a
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102 // draining task, will get a region stack from _recycled_stack_index.
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103 //
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104 // Array of indexes into the array of region stacks.
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105 static uint* _recycled_stack_index;
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106 // The index into _recycled_stack_index of the last region stack index
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107 // pushed. If -1, there are no entries into _recycled_stack_index.
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108 static int _recycled_top;
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109 // The index into _recycled_stack_index of the last region stack index
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110 // popped. If -1, there has not been any entry popped.
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111 static int _recycled_bottom;
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112
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113 Stack<Klass*, mtGC> _revisit_klass_stack;
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114 Stack<DataLayout*, mtGC> _revisit_mdo_stack;
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115
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116 static ParMarkBitMap* _mark_bitmap;
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117
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118 Action _action;
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119
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120 static PSOldGen* old_gen() { return _old_gen; }
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121 static ObjectStartArray* start_array() { return _start_array; }
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122 static OopTaskQueueSet* stack_array() { return _stack_array; }
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123
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124 static void initialize(ParMarkBitMap* mbm);
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125
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126 protected:
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127 // Array of tasks. Needed by the ParallelTaskTerminator.
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128 static RegionTaskQueueSet* region_array() { return _region_array; }
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129 OverflowTaskQueue<oop, mtGC>* marking_stack() { return &_marking_stack; }
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130
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131 // Pushes onto the marking stack. If the marking stack is full,
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132 // pushes onto the overflow stack.
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133 void stack_push(oop obj);
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134 // Do not implement an equivalent stack_pop. Deal with the
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135 // marking stack and overflow stack directly.
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136
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137 public:
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138 Action action() { return _action; }
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139 void set_action(Action v) { _action = v; }
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140
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141 RegionTaskQueue* region_stack() { return _region_stack; }
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142 void set_region_stack(RegionTaskQueue* v) { _region_stack = v; }
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143
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144 inline static ParCompactionManager* manager_array(int index);
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145
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146 inline static RegionTaskQueue* region_list(int index) {
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147 return _region_list[index];
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148 }
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149
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150 uint region_stack_index() { return _region_stack_index; }
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151 void set_region_stack_index(uint v) { _region_stack_index = v; }
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152
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153 // Pop and push unique reusable stack index
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154 static int pop_recycled_stack_index();
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155 static void push_recycled_stack_index(uint v);
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156 static void reset_recycled_stack_index() {
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157 _recycled_bottom = _recycled_top = -1;
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158 }
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159
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160 ParCompactionManager();
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161 ~ParCompactionManager();
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162
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163 // Pushes onto the region stack at the given index. If the
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164 // region stack is full,
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165 // pushes onto the region overflow stack.
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166 static void region_list_push(uint stack_index, size_t region_index);
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167 static void verify_region_list_empty(uint stack_index);
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168 ParMarkBitMap* mark_bitmap() { return _mark_bitmap; }
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169
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170 // Take actions in preparation for a compaction.
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171 static void reset();
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172
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173 // void drain_stacks();
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174
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175 bool should_update();
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176 bool should_copy();
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177
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178 Stack<Klass*, mtGC>* revisit_klass_stack() { return &_revisit_klass_stack; }
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179 Stack<DataLayout*, mtGC>* revisit_mdo_stack() { return &_revisit_mdo_stack; }
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180
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181 // Save for later processing. Must not fail.
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182 inline void push(oop obj) { _marking_stack.push(obj); }
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183 inline void push_objarray(oop objarray, size_t index);
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184 inline void push_region(size_t index);
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185
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186 // Access function for compaction managers
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187 static ParCompactionManager* gc_thread_compaction_manager(int index);
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188
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189 static bool steal(int queue_num, int* seed, oop& t) {
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190 return stack_array()->steal(queue_num, seed, t);
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191 }
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192
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193 static bool steal_objarray(int queue_num, int* seed, ObjArrayTask& t) {
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194 return _objarray_queues->steal(queue_num, seed, t);
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195 }
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196
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197 static bool steal(int queue_num, int* seed, size_t& region) {
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198 return region_array()->steal(queue_num, seed, region);
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199 }
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200
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201 // Process tasks remaining on any marking stack
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202 void follow_marking_stacks();
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203 inline bool marking_stacks_empty() const;
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204
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205 // Process tasks remaining on any stack
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206 void drain_region_stacks();
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207
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208 };
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209
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210 inline ParCompactionManager* ParCompactionManager::manager_array(int index) {
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211 assert(_manager_array != NULL, "access of NULL manager_array");
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212 assert(index >= 0 && index <= (int)ParallelGCThreads,
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213 "out of range manager_array access");
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214 return _manager_array[index];
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215 }
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216
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217 bool ParCompactionManager::marking_stacks_empty() const {
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218 return _marking_stack.is_empty() && _objarray_stack.is_empty();
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219 }
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220
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221 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSCOMPACTIONMANAGER_HPP