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annotate src/share/vm/gc_implementation/g1/g1Allocator.hpp @ 24234:ea6f94ab283b default tip

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Added tag jvmci-0.36 for changeset 8128b98d4736
author Gilles Duboscq <gilles.m.duboscq@oracle.com>
date Mon, 18 Sep 2017 18:49:45 +0200
parents c132be0fb74d
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/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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84
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85 virtual HeapRegion* new_heap_region(uint hrs_index,
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86 G1BlockOffsetSharedArray* sharedOffsetArray,
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87 MemRegion mr) {
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88 return new HeapRegion(hrs_index, sharedOffsetArray, mr);
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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