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annotate src/share/vm/gc_implementation/g1/g1Allocator.hpp @ 20445:e5668dcf12e9

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8057818: collect allocation context statistics at gc pauses Reviewed-by: mikael, jmasa
author jcoomes
date Wed, 10 Sep 2014 13:01:13 -0700
parents d35872270666
children
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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/shared/parGCAllocBuffer.hpp"
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31
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32 enum GCAllocPurpose {
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33 GCAllocForTenured,
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34 GCAllocForSurvived,
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35 GCAllocPurposeCount
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36 };
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37
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38 // Base class for G1 allocators.
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39 class G1Allocator : public CHeapObj<mtGC> {
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40 friend class VMStructs;
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41 protected:
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42 G1CollectedHeap* _g1h;
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43
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44 // Outside of GC pauses, the number of bytes used in all regions other
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45 // than the current allocation region.
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46 size_t _summary_bytes_used;
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47
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48 public:
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49 G1Allocator(G1CollectedHeap* heap) :
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50 _g1h(heap), _summary_bytes_used(0) { }
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51
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52 static G1Allocator* create_allocator(G1CollectedHeap* g1h);
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53
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54 virtual void init_mutator_alloc_region() = 0;
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55 virtual void release_mutator_alloc_region() = 0;
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56
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57 virtual void init_gc_alloc_regions(EvacuationInfo& evacuation_info) = 0;
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58 virtual void release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info) = 0;
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59 virtual void abandon_gc_alloc_regions() = 0;
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60
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61 virtual MutatorAllocRegion* mutator_alloc_region(AllocationContext_t context) = 0;
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62 virtual SurvivorGCAllocRegion* survivor_gc_alloc_region(AllocationContext_t context) = 0;
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63 virtual OldGCAllocRegion* old_gc_alloc_region(AllocationContext_t context) = 0;
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64 virtual size_t used() = 0;
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65 virtual bool is_retained_old_region(HeapRegion* hr) = 0;
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66
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67 void reuse_retained_old_region(EvacuationInfo& evacuation_info,
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68 OldGCAllocRegion* old,
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69 HeapRegion** retained);
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70
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71 size_t used_unlocked() const {
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72 return _summary_bytes_used;
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73 }
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74
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75 void increase_used(size_t bytes) {
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76 _summary_bytes_used += bytes;
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77 }
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78
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79 void decrease_used(size_t bytes) {
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80 assert(_summary_bytes_used >= bytes,
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81 err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" should be >= bytes: "SIZE_FORMAT,
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82 _summary_bytes_used, bytes));
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83 _summary_bytes_used -= bytes;
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84 }
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85
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86 void set_used(size_t bytes) {
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87 _summary_bytes_used = bytes;
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88 }
20417
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89
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90 virtual HeapRegion* new_heap_region(uint hrs_index,
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91 G1BlockOffsetSharedArray* sharedOffsetArray,
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92 MemRegion mr) {
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93 return new HeapRegion(hrs_index, sharedOffsetArray, mr);
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94 }
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95 };
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96
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97 // The default allocator for G1.
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98 class G1DefaultAllocator : public G1Allocator {
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99 protected:
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100 // Alloc region used to satisfy mutator allocation requests.
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101 MutatorAllocRegion _mutator_alloc_region;
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102
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103 // Alloc region used to satisfy allocation requests by the GC for
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104 // survivor objects.
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105 SurvivorGCAllocRegion _survivor_gc_alloc_region;
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106
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107 // Alloc region used to satisfy allocation requests by the GC for
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108 // old objects.
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109 OldGCAllocRegion _old_gc_alloc_region;
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110
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111 HeapRegion* _retained_old_gc_alloc_region;
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112 public:
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113 G1DefaultAllocator(G1CollectedHeap* heap) : G1Allocator(heap), _retained_old_gc_alloc_region(NULL) { }
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114
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115 virtual void init_mutator_alloc_region();
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116 virtual void release_mutator_alloc_region();
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117
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118 virtual void init_gc_alloc_regions(EvacuationInfo& evacuation_info);
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119 virtual void release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info);
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120 virtual void abandon_gc_alloc_regions();
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121
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122 virtual bool is_retained_old_region(HeapRegion* hr) {
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123 return _retained_old_gc_alloc_region == hr;
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124 }
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125
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126 virtual MutatorAllocRegion* mutator_alloc_region(AllocationContext_t context) {
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127 return &_mutator_alloc_region;
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128 }
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129
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130 virtual SurvivorGCAllocRegion* survivor_gc_alloc_region(AllocationContext_t context) {
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131 return &_survivor_gc_alloc_region;
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132 }
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133
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134 virtual OldGCAllocRegion* old_gc_alloc_region(AllocationContext_t context) {
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135 return &_old_gc_alloc_region;
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136 }
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137
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138 virtual size_t used() {
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139 assert(Heap_lock->owner() != NULL,
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140 "Should be owned on this thread's behalf.");
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141 size_t result = _summary_bytes_used;
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142
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143 // Read only once in case it is set to NULL concurrently
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144 HeapRegion* hr = mutator_alloc_region(AllocationContext::current())->get();
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145 if (hr != NULL) {
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146 result += hr->used();
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147 }
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148 return result;
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149 }
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150 };
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151
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152 class G1ParGCAllocBuffer: public ParGCAllocBuffer {
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153 private:
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154 bool _retired;
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155
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156 public:
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157 G1ParGCAllocBuffer(size_t gclab_word_size);
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158 virtual ~G1ParGCAllocBuffer() {
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159 guarantee(_retired, "Allocation buffer has not been retired");
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160 }
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161
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162 virtual void set_buf(HeapWord* buf) {
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163 ParGCAllocBuffer::set_buf(buf);
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164 _retired = false;
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165 }
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166
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167 virtual void retire(bool end_of_gc, bool retain) {
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168 if (_retired) {
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169 return;
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170 }
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171 ParGCAllocBuffer::retire(end_of_gc, retain);
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172 _retired = true;
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173 }
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174 };
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175
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176 class G1ParGCAllocator : public CHeapObj<mtGC> {
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177 friend class G1ParScanThreadState;
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178 protected:
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179 G1CollectedHeap* _g1h;
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180
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181 size_t _alloc_buffer_waste;
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182 size_t _undo_waste;
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183
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184 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; }
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185 void add_to_undo_waste(size_t waste) { _undo_waste += waste; }
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186
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187 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz, AllocationContext_t context);
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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(GCAllocPurpose purpose, AllocationContext_t context) = 0;
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191
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192 public:
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193 G1ParGCAllocator(G1CollectedHeap* g1h) :
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194 _g1h(g1h), _alloc_buffer_waste(0), _undo_waste(0) {
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195 }
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196
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197 static G1ParGCAllocator* create_allocator(G1CollectedHeap* g1h);
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198
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199 size_t alloc_buffer_waste() { return _alloc_buffer_waste; }
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200 size_t undo_waste() {return _undo_waste; }
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201
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202 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz, AllocationContext_t context) {
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203 HeapWord* obj = NULL;
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204 if (purpose == GCAllocForSurvived) {
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205 obj = alloc_buffer(purpose, context)->allocate_aligned(word_sz, SurvivorAlignmentInBytes);
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206 } else {
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207 obj = alloc_buffer(purpose, context)->allocate(word_sz);
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208 }
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209 if (obj != NULL) {
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210 return obj;
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211 }
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212 return allocate_slow(purpose, word_sz, context);
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213 }
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214
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215 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz, AllocationContext_t context) {
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216 if (alloc_buffer(purpose, context)->contains(obj)) {
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217 assert(alloc_buffer(purpose, context)->contains(obj + word_sz - 1),
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218 "should contain whole object");
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219 alloc_buffer(purpose, context)->undo_allocation(obj, word_sz);
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220 } else {
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221 CollectedHeap::fill_with_object(obj, word_sz);
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222 add_to_undo_waste(word_sz);
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223 }
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224 }
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225 };
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226
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227 class G1DefaultParGCAllocator : public G1ParGCAllocator {
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228 G1ParGCAllocBuffer _surviving_alloc_buffer;
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229 G1ParGCAllocBuffer _tenured_alloc_buffer;
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230 G1ParGCAllocBuffer* _alloc_buffers[GCAllocPurposeCount];
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231
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232 public:
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233 G1DefaultParGCAllocator(G1CollectedHeap* g1h);
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234
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235 virtual G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose, AllocationContext_t context) {
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236 return _alloc_buffers[purpose];
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237 }
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238
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239 virtual void retire_alloc_buffers() ;
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240 };
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241
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242 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCATOR_HPP