Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1Allocator.hpp @ 22936:fb69749583e8
8072621: Clean up around VM_GC_Operations
Reviewed-by: brutisso, jmasa
author | mlarsson |
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date | Thu, 09 Apr 2015 15:58:49 +0200 |
parents | c132be0fb74d |
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rev | line source |
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1 /* |
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2 * Copyright (c) 2014, 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_G1_G1ALLOCATOR_HPP |
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26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCATOR_HPP |
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27 |
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28 #include "gc_implementation/g1/g1AllocationContext.hpp" |
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29 #include "gc_implementation/g1/g1AllocRegion.hpp" |
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30 #include "gc_implementation/g1/g1InCSetState.hpp" |
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31 #include "gc_implementation/shared/parGCAllocBuffer.hpp" |
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32 |
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33 // Base class for G1 allocators. |
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34 class G1Allocator : public CHeapObj<mtGC> { |
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35 friend class VMStructs; |
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36 protected: |
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37 G1CollectedHeap* _g1h; |
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38 |
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39 // Outside of GC pauses, the number of bytes used in all regions other |
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40 // than the current allocation region. |
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41 size_t _summary_bytes_used; |
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42 |
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43 public: |
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44 G1Allocator(G1CollectedHeap* heap) : |
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45 _g1h(heap), _summary_bytes_used(0) { } |
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46 |
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47 static G1Allocator* create_allocator(G1CollectedHeap* g1h); |
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48 |
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49 virtual void init_mutator_alloc_region() = 0; |
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50 virtual void release_mutator_alloc_region() = 0; |
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51 |
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52 virtual void init_gc_alloc_regions(EvacuationInfo& evacuation_info) = 0; |
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53 virtual void release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info) = 0; |
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54 virtual void abandon_gc_alloc_regions() = 0; |
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55 |
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56 virtual MutatorAllocRegion* mutator_alloc_region(AllocationContext_t context) = 0; |
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57 virtual SurvivorGCAllocRegion* survivor_gc_alloc_region(AllocationContext_t context) = 0; |
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58 virtual OldGCAllocRegion* old_gc_alloc_region(AllocationContext_t context) = 0; |
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59 virtual size_t used() = 0; |
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60 virtual bool is_retained_old_region(HeapRegion* hr) = 0; |
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61 |
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62 void reuse_retained_old_region(EvacuationInfo& evacuation_info, |
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63 OldGCAllocRegion* old, |
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64 HeapRegion** retained); |
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65 |
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66 size_t used_unlocked() const { |
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67 return _summary_bytes_used; |
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68 } |
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69 |
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70 void increase_used(size_t bytes) { |
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71 _summary_bytes_used += bytes; |
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72 } |
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73 |
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74 void decrease_used(size_t bytes) { |
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75 assert(_summary_bytes_used >= bytes, |
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76 err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" should be >= bytes: "SIZE_FORMAT, |
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77 _summary_bytes_used, bytes)); |
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78 _summary_bytes_used -= bytes; |
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79 } |
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80 |
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81 void set_used(size_t bytes) { |
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82 _summary_bytes_used = bytes; |
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83 } |
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85 virtual HeapRegion* new_heap_region(uint hrs_index, | |
86 G1BlockOffsetSharedArray* sharedOffsetArray, | |
87 MemRegion mr) { | |
88 return new HeapRegion(hrs_index, sharedOffsetArray, mr); | |
89 } | |
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90 }; |
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91 |
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92 // The default allocator for G1. |
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93 class G1DefaultAllocator : public G1Allocator { |
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94 protected: |
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95 // Alloc region used to satisfy mutator allocation requests. |
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96 MutatorAllocRegion _mutator_alloc_region; |
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97 |
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98 // Alloc region used to satisfy allocation requests by the GC for |
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99 // survivor objects. |
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100 SurvivorGCAllocRegion _survivor_gc_alloc_region; |
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101 |
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102 // Alloc region used to satisfy allocation requests by the GC for |
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103 // old objects. |
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104 OldGCAllocRegion _old_gc_alloc_region; |
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105 |
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106 HeapRegion* _retained_old_gc_alloc_region; |
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107 public: |
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108 G1DefaultAllocator(G1CollectedHeap* heap) : G1Allocator(heap), _retained_old_gc_alloc_region(NULL) { } |
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109 |
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110 virtual void init_mutator_alloc_region(); |
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111 virtual void release_mutator_alloc_region(); |
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112 |
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113 virtual void init_gc_alloc_regions(EvacuationInfo& evacuation_info); |
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114 virtual void release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info); |
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115 virtual void abandon_gc_alloc_regions(); |
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116 |
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117 virtual bool is_retained_old_region(HeapRegion* hr) { |
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118 return _retained_old_gc_alloc_region == hr; |
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119 } |
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120 |
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121 virtual MutatorAllocRegion* mutator_alloc_region(AllocationContext_t context) { |
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122 return &_mutator_alloc_region; |
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123 } |
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124 |
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125 virtual SurvivorGCAllocRegion* survivor_gc_alloc_region(AllocationContext_t context) { |
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126 return &_survivor_gc_alloc_region; |
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127 } |
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128 |
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129 virtual OldGCAllocRegion* old_gc_alloc_region(AllocationContext_t context) { |
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130 return &_old_gc_alloc_region; |
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131 } |
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132 |
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133 virtual size_t used() { |
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134 assert(Heap_lock->owner() != NULL, |
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135 "Should be owned on this thread's behalf."); |
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136 size_t result = _summary_bytes_used; |
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137 |
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138 // Read only once in case it is set to NULL concurrently |
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139 HeapRegion* hr = mutator_alloc_region(AllocationContext::current())->get(); |
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140 if (hr != NULL) { |
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141 result += hr->used(); |
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142 } |
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143 return result; |
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144 } |
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145 }; |
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146 |
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147 class G1ParGCAllocBuffer: public ParGCAllocBuffer { |
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148 private: |
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149 bool _retired; |
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150 |
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151 public: |
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152 G1ParGCAllocBuffer(size_t gclab_word_size); |
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153 virtual ~G1ParGCAllocBuffer() { |
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154 guarantee(_retired, "Allocation buffer has not been retired"); |
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155 } |
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156 |
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157 virtual void set_buf(HeapWord* buf) { |
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158 ParGCAllocBuffer::set_buf(buf); |
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159 _retired = false; |
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160 } |
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161 |
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162 virtual void retire(bool end_of_gc, bool retain) { |
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163 if (_retired) { |
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164 return; |
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165 } |
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166 ParGCAllocBuffer::retire(end_of_gc, retain); |
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167 _retired = true; |
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168 } |
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169 }; |
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170 |
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171 class G1ParGCAllocator : public CHeapObj<mtGC> { |
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172 friend class G1ParScanThreadState; |
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173 protected: |
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174 G1CollectedHeap* _g1h; |
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175 |
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176 // The survivor alignment in effect in bytes. |
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177 // == 0 : don't align survivors |
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178 // != 0 : align survivors to that alignment |
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179 // These values were chosen to favor the non-alignment case since some |
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180 // architectures have a special compare against zero instructions. |
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181 const uint _survivor_alignment_bytes; |
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182 |
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183 size_t _alloc_buffer_waste; |
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184 size_t _undo_waste; |
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185 |
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186 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } |
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187 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } |
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188 |
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189 virtual void retire_alloc_buffers() = 0; |
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190 virtual G1ParGCAllocBuffer* alloc_buffer(InCSetState dest, AllocationContext_t context) = 0; |
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191 |
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192 // Calculate the survivor space object alignment in bytes. Returns that or 0 if |
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193 // there are no restrictions on survivor alignment. |
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194 static uint calc_survivor_alignment_bytes() { |
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195 assert(SurvivorAlignmentInBytes >= ObjectAlignmentInBytes, "sanity"); |
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196 if (SurvivorAlignmentInBytes == ObjectAlignmentInBytes) { |
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197 // No need to align objects in the survivors differently, return 0 |
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198 // which means "survivor alignment is not used". |
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199 return 0; |
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200 } else { |
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201 assert(SurvivorAlignmentInBytes > 0, "sanity"); |
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202 return SurvivorAlignmentInBytes; |
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203 } |
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204 } |
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205 |
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206 public: |
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207 G1ParGCAllocator(G1CollectedHeap* g1h) : |
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208 _g1h(g1h), _survivor_alignment_bytes(calc_survivor_alignment_bytes()), |
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209 _alloc_buffer_waste(0), _undo_waste(0) { |
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210 } |
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211 |
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212 static G1ParGCAllocator* create_allocator(G1CollectedHeap* g1h); |
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213 |
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214 size_t alloc_buffer_waste() { return _alloc_buffer_waste; } |
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215 size_t undo_waste() {return _undo_waste; } |
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216 |
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217 // Allocate word_sz words in dest, either directly into the regions or by |
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218 // allocating a new PLAB. Returns the address of the allocated memory, NULL if |
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219 // not successful. |
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220 HeapWord* allocate_direct_or_new_plab(InCSetState dest, |
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221 size_t word_sz, |
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222 AllocationContext_t context); |
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223 |
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224 // Allocate word_sz words in the PLAB of dest. Returns the address of the |
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225 // allocated memory, NULL if not successful. |
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226 HeapWord* plab_allocate(InCSetState dest, |
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227 size_t word_sz, |
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228 AllocationContext_t context) { |
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229 G1ParGCAllocBuffer* buffer = alloc_buffer(dest, context); |
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230 if (_survivor_alignment_bytes == 0) { |
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231 return buffer->allocate(word_sz); |
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232 } else { |
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233 return buffer->allocate_aligned(word_sz, _survivor_alignment_bytes); |
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234 } |
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235 } |
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236 |
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237 HeapWord* allocate(InCSetState dest, size_t word_sz, |
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238 AllocationContext_t context) { |
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239 HeapWord* const obj = plab_allocate(dest, word_sz, context); |
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240 if (obj != NULL) { |
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241 return obj; |
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242 } |
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243 return allocate_direct_or_new_plab(dest, word_sz, context); |
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244 } |
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245 |
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246 void undo_allocation(InCSetState dest, HeapWord* obj, size_t word_sz, AllocationContext_t context) { |
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247 if (alloc_buffer(dest, context)->contains(obj)) { |
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248 assert(alloc_buffer(dest, context)->contains(obj + word_sz - 1), |
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249 "should contain whole object"); |
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250 alloc_buffer(dest, context)->undo_allocation(obj, word_sz); |
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251 } else { |
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252 CollectedHeap::fill_with_object(obj, word_sz); |
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253 add_to_undo_waste(word_sz); |
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254 } |
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255 } |
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256 }; |
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257 |
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258 class G1DefaultParGCAllocator : public G1ParGCAllocator { |
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259 G1ParGCAllocBuffer _surviving_alloc_buffer; |
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260 G1ParGCAllocBuffer _tenured_alloc_buffer; |
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261 G1ParGCAllocBuffer* _alloc_buffers[InCSetState::Num]; |
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262 |
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263 public: |
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264 G1DefaultParGCAllocator(G1CollectedHeap* g1h); |
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265 |
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266 virtual G1ParGCAllocBuffer* alloc_buffer(InCSetState dest, AllocationContext_t context) { |
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267 assert(dest.is_valid(), |
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268 err_msg("Allocation buffer index out-of-bounds: " CSETSTATE_FORMAT, dest.value())); |
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269 assert(_alloc_buffers[dest.value()] != NULL, |
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270 err_msg("Allocation buffer is NULL: " CSETSTATE_FORMAT, dest.value())); |
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271 return _alloc_buffers[dest.value()]; |
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272 } |
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273 |
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274 virtual void retire_alloc_buffers() ; |
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275 }; |
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276 |
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277 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCATOR_HPP |