Mercurial > hg > truffle
annotate src/share/vm/memory/metaspace.cpp @ 8754:82ab039b9680
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author | dcubed |
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date | Sun, 17 Mar 2013 08:57:56 -0700 |
parents | 15401203db6b 82f49e8e2c28 |
children | 47902e9acb3a 91bf0bdae37b |
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1 /* |
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2 * Copyright (c) 2011, 2013, 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 #include "precompiled.hpp" |
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25 #include "gc_interface/collectedHeap.hpp" |
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26 #include "memory/binaryTreeDictionary.hpp" |
6885 | 27 #include "memory/freeList.hpp" |
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28 #include "memory/collectorPolicy.hpp" |
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29 #include "memory/filemap.hpp" |
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30 #include "memory/freeList.hpp" |
6885 | 31 #include "memory/metablock.hpp" |
32 #include "memory/metachunk.hpp" | |
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33 #include "memory/metaspace.hpp" |
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34 #include "memory/metaspaceShared.hpp" |
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35 #include "memory/resourceArea.hpp" |
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36 #include "memory/universe.hpp" |
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37 #include "runtime/globals.hpp" |
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38 #include "runtime/mutex.hpp" |
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39 #include "runtime/orderAccess.hpp" |
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40 #include "services/memTracker.hpp" |
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41 #include "utilities/copy.hpp" |
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42 #include "utilities/debug.hpp" |
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43 |
6885 | 44 typedef BinaryTreeDictionary<Metablock, FreeList> BlockTreeDictionary; |
45 typedef BinaryTreeDictionary<Metachunk, FreeList> ChunkTreeDictionary; | |
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46 // Define this macro to enable slow integrity checking of |
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47 // the free chunk lists |
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48 const bool metaspace_slow_verify = false; |
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49 |
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50 |
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51 // Parameters for stress mode testing |
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52 const uint metadata_deallocate_a_lot_block = 10; |
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53 const uint metadata_deallocate_a_lock_chunk = 3; |
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54 size_t const allocation_from_dictionary_limit = 64 * K; |
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55 |
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56 MetaWord* last_allocated = 0; |
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57 |
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58 // Used in declarations in SpaceManager and ChunkManager |
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59 enum ChunkIndex { |
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60 ZeroIndex = 0, |
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61 SpecializedIndex = ZeroIndex, |
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62 SmallIndex = SpecializedIndex + 1, |
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63 MediumIndex = SmallIndex + 1, |
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64 HumongousIndex = MediumIndex + 1, |
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65 NumberOfFreeLists = 3, |
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66 NumberOfInUseLists = 4 |
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67 }; |
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68 |
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69 enum ChunkSizes { // in words. |
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70 ClassSpecializedChunk = 128, |
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71 SpecializedChunk = 128, |
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72 ClassSmallChunk = 256, |
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73 SmallChunk = 512, |
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74 ClassMediumChunk = 1 * K, |
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75 MediumChunk = 8 * K, |
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76 HumongousChunkGranularity = 8 |
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77 }; |
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78 |
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79 static ChunkIndex next_chunk_index(ChunkIndex i) { |
6885 | 80 assert(i < NumberOfInUseLists, "Out of bound"); |
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81 return (ChunkIndex) (i+1); |
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82 } |
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83 |
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84 // Originally _capacity_until_GC was set to MetaspaceSize here but |
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85 // the default MetaspaceSize before argument processing was being |
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86 // used which was not the desired value. See the code |
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87 // in should_expand() to see how the initialization is handled |
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88 // now. |
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89 size_t MetaspaceGC::_capacity_until_GC = 0; |
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90 bool MetaspaceGC::_expand_after_GC = false; |
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91 uint MetaspaceGC::_shrink_factor = 0; |
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92 bool MetaspaceGC::_should_concurrent_collect = false; |
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93 |
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94 // Blocks of space for metadata are allocated out of Metachunks. |
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95 // |
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96 // Metachunk are allocated out of MetadataVirtualspaces and once |
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97 // allocated there is no explicit link between a Metachunk and |
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98 // the MetadataVirtualspaces from which it was allocated. |
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99 // |
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100 // Each SpaceManager maintains a |
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101 // list of the chunks it is using and the current chunk. The current |
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102 // chunk is the chunk from which allocations are done. Space freed in |
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103 // a chunk is placed on the free list of blocks (BlockFreelist) and |
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104 // reused from there. |
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105 |
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106 // Pointer to list of Metachunks. |
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107 class ChunkList VALUE_OBJ_CLASS_SPEC { |
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108 // List of free chunks |
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109 Metachunk* _head; |
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110 |
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111 public: |
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112 // Constructor |
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113 ChunkList() : _head(NULL) {} |
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114 |
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115 // Accessors |
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116 Metachunk* head() { return _head; } |
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117 void set_head(Metachunk* v) { _head = v; } |
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118 |
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119 // Link at head of the list |
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120 void add_at_head(Metachunk* head, Metachunk* tail); |
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121 void add_at_head(Metachunk* head); |
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122 |
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123 size_t sum_list_size(); |
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124 size_t sum_list_count(); |
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125 size_t sum_list_capacity(); |
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126 }; |
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127 |
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128 // Manages the global free lists of chunks. |
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129 // Has three lists of free chunks, and a total size and |
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130 // count that includes all three |
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131 |
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132 class ChunkManager VALUE_OBJ_CLASS_SPEC { |
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133 |
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134 // Free list of chunks of different sizes. |
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135 // SmallChunk |
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136 // MediumChunk |
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137 // HumongousChunk |
6885 | 138 ChunkList _free_chunks[NumberOfFreeLists]; |
139 | |
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140 |
6885 | 141 // HumongousChunk |
142 ChunkTreeDictionary _humongous_dictionary; | |
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143 |
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144 // ChunkManager in all lists of this type |
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145 size_t _free_chunks_total; |
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146 size_t _free_chunks_count; |
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147 |
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148 void dec_free_chunks_total(size_t v) { |
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149 assert(_free_chunks_count > 0 && |
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150 _free_chunks_total > 0, |
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151 "About to go negative"); |
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152 Atomic::add_ptr(-1, &_free_chunks_count); |
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153 jlong minus_v = (jlong) - (jlong) v; |
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154 Atomic::add_ptr(minus_v, &_free_chunks_total); |
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155 } |
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156 |
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157 // Debug support |
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158 |
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159 size_t sum_free_chunks(); |
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160 size_t sum_free_chunks_count(); |
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161 |
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162 void locked_verify_free_chunks_total(); |
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163 void slow_locked_verify_free_chunks_total() { |
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164 if (metaspace_slow_verify) { |
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165 locked_verify_free_chunks_total(); |
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166 } |
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167 } |
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168 void locked_verify_free_chunks_count(); |
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169 void slow_locked_verify_free_chunks_count() { |
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170 if (metaspace_slow_verify) { |
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171 locked_verify_free_chunks_count(); |
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172 } |
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173 } |
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174 void verify_free_chunks_count(); |
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175 |
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176 public: |
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177 |
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178 ChunkManager() : _free_chunks_total(0), _free_chunks_count(0) {} |
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179 |
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180 // add or delete (return) a chunk to the global freelist. |
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181 Metachunk* chunk_freelist_allocate(size_t word_size); |
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182 void chunk_freelist_deallocate(Metachunk* chunk); |
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183 |
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184 // Map a size to a list index assuming that there are lists |
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185 // for special, small, medium, and humongous chunks. |
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186 static ChunkIndex list_index(size_t size); |
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187 |
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188 // Total of the space in the free chunks list |
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189 size_t free_chunks_total(); |
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190 size_t free_chunks_total_in_bytes(); |
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191 |
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192 // Number of chunks in the free chunks list |
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193 size_t free_chunks_count(); |
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194 |
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195 void inc_free_chunks_total(size_t v, size_t count = 1) { |
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196 Atomic::add_ptr(count, &_free_chunks_count); |
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197 Atomic::add_ptr(v, &_free_chunks_total); |
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198 } |
6885 | 199 ChunkTreeDictionary* humongous_dictionary() { |
200 return &_humongous_dictionary; | |
201 } | |
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202 |
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203 ChunkList* free_chunks(ChunkIndex index); |
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204 |
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205 // Returns the list for the given chunk word size. |
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206 ChunkList* find_free_chunks_list(size_t word_size); |
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207 |
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208 // Add and remove from a list by size. Selects |
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209 // list based on size of chunk. |
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210 void free_chunks_put(Metachunk* chuck); |
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211 Metachunk* free_chunks_get(size_t chunk_word_size); |
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212 |
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213 // Debug support |
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214 void verify(); |
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215 void slow_verify() { |
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216 if (metaspace_slow_verify) { |
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217 verify(); |
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218 } |
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219 } |
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220 void locked_verify(); |
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221 void slow_locked_verify() { |
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222 if (metaspace_slow_verify) { |
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223 locked_verify(); |
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224 } |
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225 } |
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226 void verify_free_chunks_total(); |
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227 |
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228 void locked_print_free_chunks(outputStream* st); |
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229 void locked_print_sum_free_chunks(outputStream* st); |
6885 | 230 |
231 void print_on(outputStream* st); | |
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232 }; |
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233 |
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234 |
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235 // Used to manage the free list of Metablocks (a block corresponds |
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236 // to the allocation of a quantum of metadata). |
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237 class BlockFreelist VALUE_OBJ_CLASS_SPEC { |
6885 | 238 BlockTreeDictionary* _dictionary; |
239 static Metablock* initialize_free_chunk(MetaWord* p, size_t word_size); | |
240 | |
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241 // Accessors |
6885 | 242 BlockTreeDictionary* dictionary() const { return _dictionary; } |
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243 |
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244 public: |
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245 BlockFreelist(); |
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246 ~BlockFreelist(); |
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247 |
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248 // Get and return a block to the free list |
6885 | 249 MetaWord* get_block(size_t word_size); |
250 void return_block(MetaWord* p, size_t word_size); | |
251 | |
252 size_t total_size() { | |
253 if (dictionary() == NULL) { | |
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254 return 0; |
6885 | 255 } else { |
256 return dictionary()->total_size(); | |
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257 } |
6885 | 258 } |
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259 |
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260 void print_on(outputStream* st) const; |
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261 }; |
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262 |
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263 class VirtualSpaceNode : public CHeapObj<mtClass> { |
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264 friend class VirtualSpaceList; |
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265 |
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266 // Link to next VirtualSpaceNode |
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267 VirtualSpaceNode* _next; |
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268 |
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269 // total in the VirtualSpace |
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270 MemRegion _reserved; |
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271 ReservedSpace _rs; |
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272 VirtualSpace _virtual_space; |
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273 MetaWord* _top; |
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274 |
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275 // Convenience functions for logical bottom and end |
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276 MetaWord* bottom() const { return (MetaWord*) _virtual_space.low(); } |
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277 MetaWord* end() const { return (MetaWord*) _virtual_space.high(); } |
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278 |
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279 // Convenience functions to access the _virtual_space |
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280 char* low() const { return virtual_space()->low(); } |
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281 char* high() const { return virtual_space()->high(); } |
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282 |
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283 public: |
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284 |
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285 VirtualSpaceNode(size_t byte_size); |
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286 VirtualSpaceNode(ReservedSpace rs) : _top(NULL), _next(NULL), _rs(rs) {} |
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287 ~VirtualSpaceNode(); |
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288 |
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289 // address of next available space in _virtual_space; |
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290 // Accessors |
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291 VirtualSpaceNode* next() { return _next; } |
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292 void set_next(VirtualSpaceNode* v) { _next = v; } |
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293 |
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294 void set_reserved(MemRegion const v) { _reserved = v; } |
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295 void set_top(MetaWord* v) { _top = v; } |
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296 |
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297 // Accessors |
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298 MemRegion* reserved() { return &_reserved; } |
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299 VirtualSpace* virtual_space() const { return (VirtualSpace*) &_virtual_space; } |
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300 |
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301 // Returns true if "word_size" is available in the virtual space |
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302 bool is_available(size_t word_size) { return _top + word_size <= end(); } |
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303 |
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304 MetaWord* top() const { return _top; } |
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305 void inc_top(size_t word_size) { _top += word_size; } |
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306 |
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307 // used and capacity in this single entry in the list |
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308 size_t used_words_in_vs() const; |
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309 size_t capacity_words_in_vs() const; |
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310 |
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311 bool initialize(); |
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312 |
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313 // get space from the virtual space |
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314 Metachunk* take_from_committed(size_t chunk_word_size); |
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315 |
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316 // Allocate a chunk from the virtual space and return it. |
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317 Metachunk* get_chunk_vs(size_t chunk_word_size); |
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318 Metachunk* get_chunk_vs_with_expand(size_t chunk_word_size); |
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319 |
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320 // Expands/shrinks the committed space in a virtual space. Delegates |
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321 // to Virtualspace |
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322 bool expand_by(size_t words, bool pre_touch = false); |
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323 bool shrink_by(size_t words); |
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324 |
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325 #ifdef ASSERT |
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326 // Debug support |
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327 static void verify_virtual_space_total(); |
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328 static void verify_virtual_space_count(); |
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329 void mangle(); |
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330 #endif |
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331 |
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332 void print_on(outputStream* st) const; |
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333 }; |
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334 |
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335 // byte_size is the size of the associated virtualspace. |
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336 VirtualSpaceNode::VirtualSpaceNode(size_t byte_size) : _top(NULL), _next(NULL), _rs(0) { |
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337 // align up to vm allocation granularity |
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338 byte_size = align_size_up(byte_size, os::vm_allocation_granularity()); |
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339 |
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340 // This allocates memory with mmap. For DumpSharedspaces, allocate the |
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341 // space at low memory so that other shared images don't conflict. |
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342 // This is the same address as memory needed for UseCompressedOops but |
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343 // compressed oops don't work with CDS (offsets in metadata are wrong), so |
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344 // borrow the same address. |
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345 if (DumpSharedSpaces) { |
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346 char* shared_base = (char*)HeapBaseMinAddress; |
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347 _rs = ReservedSpace(byte_size, 0, false, shared_base, 0); |
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348 if (_rs.is_reserved()) { |
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349 assert(_rs.base() == shared_base, "should match"); |
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350 } else { |
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351 // If we are dumping the heap, then allocate a wasted block of address |
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352 // space in order to push the heap to a lower address. This extra |
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353 // address range allows for other (or larger) libraries to be loaded |
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354 // without them occupying the space required for the shared spaces. |
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355 uintx reserved = 0; |
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356 uintx block_size = 64*1024*1024; |
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357 while (reserved < SharedDummyBlockSize) { |
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358 char* dummy = os::reserve_memory(block_size); |
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359 reserved += block_size; |
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360 } |
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361 _rs = ReservedSpace(byte_size); |
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362 } |
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363 MetaspaceShared::set_shared_rs(&_rs); |
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364 } else { |
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365 _rs = ReservedSpace(byte_size); |
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366 } |
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367 |
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368 MemTracker::record_virtual_memory_type((address)_rs.base(), mtClass); |
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369 } |
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370 |
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371 // List of VirtualSpaces for metadata allocation. |
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372 // It has a _next link for singly linked list and a MemRegion |
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373 // for total space in the VirtualSpace. |
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374 class VirtualSpaceList : public CHeapObj<mtClass> { |
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375 friend class VirtualSpaceNode; |
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376 |
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377 enum VirtualSpaceSizes { |
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378 VirtualSpaceSize = 256 * K |
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379 }; |
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380 |
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381 // Global list of virtual spaces |
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382 // Head of the list |
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383 VirtualSpaceNode* _virtual_space_list; |
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384 // virtual space currently being used for allocations |
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385 VirtualSpaceNode* _current_virtual_space; |
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386 // Free chunk list for all other metadata |
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387 ChunkManager _chunk_manager; |
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388 |
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389 // Can this virtual list allocate >1 spaces? Also, used to determine |
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390 // whether to allocate unlimited small chunks in this virtual space |
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391 bool _is_class; |
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392 bool can_grow() const { return !is_class() || !UseCompressedKlassPointers; } |
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393 |
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394 // Sum of space in all virtual spaces and number of virtual spaces |
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395 size_t _virtual_space_total; |
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396 size_t _virtual_space_count; |
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397 |
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398 ~VirtualSpaceList(); |
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399 |
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400 VirtualSpaceNode* virtual_space_list() const { return _virtual_space_list; } |
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401 |
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402 void set_virtual_space_list(VirtualSpaceNode* v) { |
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403 _virtual_space_list = v; |
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404 } |
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405 void set_current_virtual_space(VirtualSpaceNode* v) { |
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406 _current_virtual_space = v; |
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407 } |
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408 |
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409 void link_vs(VirtualSpaceNode* new_entry, size_t vs_word_size); |
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410 |
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411 // Get another virtual space and add it to the list. This |
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412 // is typically prompted by a failed attempt to allocate a chunk |
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413 // and is typically followed by the allocation of a chunk. |
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414 bool grow_vs(size_t vs_word_size); |
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415 |
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416 public: |
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417 VirtualSpaceList(size_t word_size); |
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418 VirtualSpaceList(ReservedSpace rs); |
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419 |
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420 Metachunk* get_new_chunk(size_t word_size, |
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421 size_t grow_chunks_by_words, |
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422 size_t medium_chunk_bunch); |
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423 |
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424 // Get the first chunk for a Metaspace. Used for |
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425 // special cases such as the boot class loader, reflection |
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426 // class loader and anonymous class loader. |
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427 Metachunk* get_initialization_chunk(size_t word_size, size_t chunk_bunch); |
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428 |
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429 VirtualSpaceNode* current_virtual_space() { |
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430 return _current_virtual_space; |
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431 } |
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432 |
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433 ChunkManager* chunk_manager() { return &_chunk_manager; } |
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434 bool is_class() const { return _is_class; } |
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435 |
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436 // Allocate the first virtualspace. |
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437 void initialize(size_t word_size); |
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438 |
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439 size_t virtual_space_total() { return _virtual_space_total; } |
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440 void inc_virtual_space_total(size_t v) { |
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441 Atomic::add_ptr(v, &_virtual_space_total); |
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442 } |
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443 |
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444 size_t virtual_space_count() { return _virtual_space_count; } |
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445 void inc_virtual_space_count() { |
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446 Atomic::inc_ptr(&_virtual_space_count); |
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447 } |
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448 |
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449 // Used and capacity in the entire list of virtual spaces. |
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450 // These are global values shared by all Metaspaces |
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451 size_t capacity_words_sum(); |
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452 size_t capacity_bytes_sum() { return capacity_words_sum() * BytesPerWord; } |
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453 size_t used_words_sum(); |
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454 size_t used_bytes_sum() { return used_words_sum() * BytesPerWord; } |
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455 |
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456 bool contains(const void *ptr); |
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457 |
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458 void print_on(outputStream* st) const; |
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459 |
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460 class VirtualSpaceListIterator : public StackObj { |
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461 VirtualSpaceNode* _virtual_spaces; |
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462 public: |
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463 VirtualSpaceListIterator(VirtualSpaceNode* virtual_spaces) : |
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464 _virtual_spaces(virtual_spaces) {} |
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465 |
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466 bool repeat() { |
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467 return _virtual_spaces != NULL; |
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468 } |
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469 |
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470 VirtualSpaceNode* get_next() { |
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471 VirtualSpaceNode* result = _virtual_spaces; |
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472 if (_virtual_spaces != NULL) { |
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473 _virtual_spaces = _virtual_spaces->next(); |
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474 } |
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475 return result; |
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476 } |
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477 }; |
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478 }; |
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479 |
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480 class Metadebug : AllStatic { |
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481 // Debugging support for Metaspaces |
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482 static int _deallocate_block_a_lot_count; |
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483 static int _deallocate_chunk_a_lot_count; |
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484 static int _allocation_fail_alot_count; |
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485 |
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486 public: |
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487 static int deallocate_block_a_lot_count() { |
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488 return _deallocate_block_a_lot_count; |
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489 } |
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490 static void set_deallocate_block_a_lot_count(int v) { |
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491 _deallocate_block_a_lot_count = v; |
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492 } |
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493 static void inc_deallocate_block_a_lot_count() { |
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494 _deallocate_block_a_lot_count++; |
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495 } |
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496 static int deallocate_chunk_a_lot_count() { |
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497 return _deallocate_chunk_a_lot_count; |
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498 } |
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499 static void reset_deallocate_chunk_a_lot_count() { |
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500 _deallocate_chunk_a_lot_count = 1; |
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501 } |
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502 static void inc_deallocate_chunk_a_lot_count() { |
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503 _deallocate_chunk_a_lot_count++; |
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504 } |
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505 |
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506 static void init_allocation_fail_alot_count(); |
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507 #ifdef ASSERT |
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508 static bool test_metadata_failure(); |
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509 #endif |
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510 |
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511 static void deallocate_chunk_a_lot(SpaceManager* sm, |
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512 size_t chunk_word_size); |
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513 static void deallocate_block_a_lot(SpaceManager* sm, |
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514 size_t chunk_word_size); |
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515 |
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516 }; |
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517 |
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518 int Metadebug::_deallocate_block_a_lot_count = 0; |
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519 int Metadebug::_deallocate_chunk_a_lot_count = 0; |
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520 int Metadebug::_allocation_fail_alot_count = 0; |
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521 |
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522 // SpaceManager - used by Metaspace to handle allocations |
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523 class SpaceManager : public CHeapObj<mtClass> { |
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524 friend class Metaspace; |
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525 friend class Metadebug; |
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526 |
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527 private: |
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528 |
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529 // protects allocations and contains. |
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530 Mutex* const _lock; |
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531 |
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532 // Chunk related size |
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533 size_t _medium_chunk_bunch; |
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534 |
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535 // List of chunks in use by this SpaceManager. Allocations |
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536 // are done from the current chunk. The list is used for deallocating |
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537 // chunks when the SpaceManager is freed. |
6885 | 538 Metachunk* _chunks_in_use[NumberOfInUseLists]; |
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539 Metachunk* _current_chunk; |
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540 |
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541 // Virtual space where allocation comes from. |
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542 VirtualSpaceList* _vs_list; |
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543 |
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544 // Number of small chunks to allocate to a manager |
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545 // If class space manager, small chunks are unlimited |
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546 static uint const _small_chunk_limit; |
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547 bool has_small_chunk_limit() { return !vs_list()->is_class(); } |
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548 |
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549 // Sum of all space in allocated chunks |
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550 size_t _allocation_total; |
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551 |
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552 // Free lists of blocks are per SpaceManager since they |
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553 // are assumed to be in chunks in use by the SpaceManager |
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554 // and all chunks in use by a SpaceManager are freed when |
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555 // the class loader using the SpaceManager is collected. |
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556 BlockFreelist _block_freelists; |
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557 |
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558 // protects virtualspace and chunk expansions |
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559 static const char* _expand_lock_name; |
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560 static const int _expand_lock_rank; |
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561 static Mutex* const _expand_lock; |
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562 |
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563 private: |
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564 // Accessors |
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565 Metachunk* chunks_in_use(ChunkIndex index) const { return _chunks_in_use[index]; } |
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566 void set_chunks_in_use(ChunkIndex index, Metachunk* v) { _chunks_in_use[index] = v; } |
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567 |
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568 BlockFreelist* block_freelists() const { |
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569 return (BlockFreelist*) &_block_freelists; |
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570 } |
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571 |
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572 VirtualSpaceList* vs_list() const { return _vs_list; } |
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573 |
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574 Metachunk* current_chunk() const { return _current_chunk; } |
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575 void set_current_chunk(Metachunk* v) { |
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576 _current_chunk = v; |
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577 } |
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578 |
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579 Metachunk* find_current_chunk(size_t word_size); |
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580 |
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581 // Add chunk to the list of chunks in use |
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582 void add_chunk(Metachunk* v, bool make_current); |
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583 |
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584 Mutex* lock() const { return _lock; } |
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585 |
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586 const char* chunk_size_name(ChunkIndex index) const; |
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587 |
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588 protected: |
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589 void initialize(); |
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590 |
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591 public: |
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592 SpaceManager(Mutex* lock, |
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593 VirtualSpaceList* vs_list); |
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594 ~SpaceManager(); |
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595 |
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596 enum ChunkMultiples { |
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597 MediumChunkMultiple = 4 |
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598 }; |
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599 |
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600 // Accessors |
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601 size_t specialized_chunk_size() { return SpecializedChunk; } |
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602 size_t small_chunk_size() { return (size_t) vs_list()->is_class() ? ClassSmallChunk : SmallChunk; } |
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603 size_t medium_chunk_size() { return (size_t) vs_list()->is_class() ? ClassMediumChunk : MediumChunk; } |
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604 size_t medium_chunk_bunch() { return medium_chunk_size() * MediumChunkMultiple; } |
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605 |
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606 size_t allocation_total() const { return _allocation_total; } |
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607 void inc_allocation_total(size_t v) { Atomic::add_ptr(v, &_allocation_total); } |
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608 bool is_humongous(size_t word_size) { return word_size > medium_chunk_size(); } |
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609 |
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610 static Mutex* expand_lock() { return _expand_lock; } |
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611 |
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612 // Set the sizes for the initial chunks. |
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613 void get_initial_chunk_sizes(Metaspace::MetaspaceType type, |
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614 size_t* chunk_word_size, |
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615 size_t* class_chunk_word_size); |
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616 |
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617 size_t sum_capacity_in_chunks_in_use() const; |
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618 size_t sum_used_in_chunks_in_use() const; |
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619 size_t sum_free_in_chunks_in_use() const; |
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620 size_t sum_waste_in_chunks_in_use() const; |
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621 size_t sum_waste_in_chunks_in_use(ChunkIndex index ) const; |
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622 |
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623 size_t sum_count_in_chunks_in_use(); |
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624 size_t sum_count_in_chunks_in_use(ChunkIndex i); |
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625 |
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626 Metachunk* get_new_chunk(size_t word_size, size_t grow_chunks_by_words); |
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627 |
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628 // Block allocation and deallocation. |
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629 // Allocates a block from the current chunk |
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630 MetaWord* allocate(size_t word_size); |
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631 |
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632 // Helper for allocations |
6885 | 633 MetaWord* allocate_work(size_t word_size); |
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634 |
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635 // Returns a block to the per manager freelist |
6885 | 636 void deallocate(MetaWord* p, size_t word_size); |
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637 |
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638 // Based on the allocation size and a minimum chunk size, |
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639 // returned chunk size (for expanding space for chunk allocation). |
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640 size_t calc_chunk_size(size_t allocation_word_size); |
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641 |
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642 // Called when an allocation from the current chunk fails. |
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643 // Gets a new chunk (may require getting a new virtual space), |
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644 // and allocates from that chunk. |
6885 | 645 MetaWord* grow_and_allocate(size_t word_size); |
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646 |
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647 // debugging support. |
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648 |
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649 void dump(outputStream* const out) const; |
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650 void print_on(outputStream* st) const; |
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651 void locked_print_chunks_in_use_on(outputStream* st) const; |
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652 |
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653 void verify(); |
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654 void verify_chunk_size(Metachunk* chunk); |
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655 NOT_PRODUCT(void mangle_freed_chunks();) |
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656 #ifdef ASSERT |
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657 void verify_allocation_total(); |
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658 #endif |
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659 }; |
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660 |
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661 uint const SpaceManager::_small_chunk_limit = 4; |
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662 |
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663 const char* SpaceManager::_expand_lock_name = |
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664 "SpaceManager chunk allocation lock"; |
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665 const int SpaceManager::_expand_lock_rank = Monitor::leaf - 1; |
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666 Mutex* const SpaceManager::_expand_lock = |
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667 new Mutex(SpaceManager::_expand_lock_rank, |
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668 SpaceManager::_expand_lock_name, |
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669 Mutex::_allow_vm_block_flag); |
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670 |
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671 // BlockFreelist methods |
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672 |
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673 BlockFreelist::BlockFreelist() : _dictionary(NULL) {} |
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674 |
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675 BlockFreelist::~BlockFreelist() { |
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676 if (_dictionary != NULL) { |
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677 if (Verbose && TraceMetadataChunkAllocation) { |
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678 _dictionary->print_free_lists(gclog_or_tty); |
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679 } |
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680 delete _dictionary; |
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681 } |
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682 } |
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683 |
6885 | 684 Metablock* BlockFreelist::initialize_free_chunk(MetaWord* p, size_t word_size) { |
685 Metablock* block = (Metablock*) p; | |
686 block->set_word_size(word_size); | |
687 block->set_prev(NULL); | |
688 block->set_next(NULL); | |
689 | |
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690 return block; |
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691 } |
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692 |
6885 | 693 void BlockFreelist::return_block(MetaWord* p, size_t word_size) { |
694 Metablock* free_chunk = initialize_free_chunk(p, word_size); | |
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695 if (dictionary() == NULL) { |
6885 | 696 _dictionary = new BlockTreeDictionary(); |
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697 } |
6885 | 698 dictionary()->return_chunk(free_chunk); |
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699 } |
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700 |
6885 | 701 MetaWord* BlockFreelist::get_block(size_t word_size) { |
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702 if (dictionary() == NULL) { |
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703 return NULL; |
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704 } |
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705 |
6885 | 706 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) { |
707 // Dark matter. Too small for dictionary. | |
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708 return NULL; |
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709 } |
6885 | 710 |
711 Metablock* free_block = | |
712 dictionary()->get_chunk(word_size, FreeBlockDictionary<Metablock>::exactly); | |
713 if (free_block == NULL) { | |
714 return NULL; | |
715 } | |
716 | |
717 return (MetaWord*) free_block; | |
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718 } |
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719 |
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720 void BlockFreelist::print_on(outputStream* st) const { |
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721 if (dictionary() == NULL) { |
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722 return; |
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723 } |
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724 dictionary()->print_free_lists(st); |
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725 } |
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726 |
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727 // VirtualSpaceNode methods |
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728 |
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729 VirtualSpaceNode::~VirtualSpaceNode() { |
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730 _rs.release(); |
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731 } |
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732 |
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733 size_t VirtualSpaceNode::used_words_in_vs() const { |
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734 return pointer_delta(top(), bottom(), sizeof(MetaWord)); |
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735 } |
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736 |
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737 // Space committed in the VirtualSpace |
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738 size_t VirtualSpaceNode::capacity_words_in_vs() const { |
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739 return pointer_delta(end(), bottom(), sizeof(MetaWord)); |
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740 } |
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741 |
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742 |
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743 // Allocates the chunk from the virtual space only. |
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744 // This interface is also used internally for debugging. Not all |
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745 // chunks removed here are necessarily used for allocation. |
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746 Metachunk* VirtualSpaceNode::take_from_committed(size_t chunk_word_size) { |
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747 // Bottom of the new chunk |
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748 MetaWord* chunk_limit = top(); |
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749 assert(chunk_limit != NULL, "Not safe to call this method"); |
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750 |
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751 if (!is_available(chunk_word_size)) { |
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752 if (TraceMetadataChunkAllocation) { |
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753 tty->print("VirtualSpaceNode::take_from_committed() not available %d words ", chunk_word_size); |
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754 // Dump some information about the virtual space that is nearly full |
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755 print_on(tty); |
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756 } |
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757 return NULL; |
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758 } |
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759 |
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760 // Take the space (bump top on the current virtual space). |
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761 inc_top(chunk_word_size); |
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762 |
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763 // Point the chunk at the space |
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764 Metachunk* result = Metachunk::initialize(chunk_limit, chunk_word_size); |
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765 return result; |
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766 } |
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767 |
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768 |
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769 // Expand the virtual space (commit more of the reserved space) |
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770 bool VirtualSpaceNode::expand_by(size_t words, bool pre_touch) { |
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771 size_t bytes = words * BytesPerWord; |
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772 bool result = virtual_space()->expand_by(bytes, pre_touch); |
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773 if (TraceMetavirtualspaceAllocation && !result) { |
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774 gclog_or_tty->print_cr("VirtualSpaceNode::expand_by() failed " |
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775 "for byte size " SIZE_FORMAT, bytes); |
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776 virtual_space()->print(); |
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777 } |
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778 return result; |
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779 } |
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780 |
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781 // Shrink the virtual space (commit more of the reserved space) |
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782 bool VirtualSpaceNode::shrink_by(size_t words) { |
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783 size_t bytes = words * BytesPerWord; |
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784 virtual_space()->shrink_by(bytes); |
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785 return true; |
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786 } |
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787 |
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788 // Add another chunk to the chunk list. |
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789 |
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790 Metachunk* VirtualSpaceNode::get_chunk_vs(size_t chunk_word_size) { |
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791 assert_lock_strong(SpaceManager::expand_lock()); |
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792 Metachunk* result = NULL; |
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793 |
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794 return take_from_committed(chunk_word_size); |
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795 } |
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796 |
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797 Metachunk* VirtualSpaceNode::get_chunk_vs_with_expand(size_t chunk_word_size) { |
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798 assert_lock_strong(SpaceManager::expand_lock()); |
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799 |
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800 Metachunk* new_chunk = get_chunk_vs(chunk_word_size); |
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801 |
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802 if (new_chunk == NULL) { |
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803 // Only a small part of the virtualspace is committed when first |
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804 // allocated so committing more here can be expected. |
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805 size_t page_size_words = os::vm_page_size() / BytesPerWord; |
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806 size_t aligned_expand_vs_by_words = align_size_up(chunk_word_size, |
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807 page_size_words); |
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808 expand_by(aligned_expand_vs_by_words, false); |
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809 new_chunk = get_chunk_vs(chunk_word_size); |
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810 } |
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811 return new_chunk; |
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812 } |
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813 |
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814 bool VirtualSpaceNode::initialize() { |
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815 |
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816 if (!_rs.is_reserved()) { |
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817 return false; |
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818 } |
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819 |
7446
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820 // An allocation out of this Virtualspace that is larger |
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821 // than an initial commit size can waste that initial committed |
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822 // space. |
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823 size_t committed_byte_size = 0; |
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824 bool result = virtual_space()->initialize(_rs, committed_byte_size); |
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825 if (result) { |
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826 set_top((MetaWord*)virtual_space()->low()); |
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827 set_reserved(MemRegion((HeapWord*)_rs.base(), |
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828 (HeapWord*)(_rs.base() + _rs.size()))); |
6726
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829 |
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830 assert(reserved()->start() == (HeapWord*) _rs.base(), |
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831 err_msg("Reserved start was not set properly " PTR_FORMAT |
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832 " != " PTR_FORMAT, reserved()->start(), _rs.base())); |
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833 assert(reserved()->word_size() == _rs.size() / BytesPerWord, |
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834 err_msg("Reserved size was not set properly " SIZE_FORMAT |
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835 " != " SIZE_FORMAT, reserved()->word_size(), |
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836 _rs.size() / BytesPerWord)); |
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837 } |
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838 |
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839 return result; |
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840 } |
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841 |
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842 void VirtualSpaceNode::print_on(outputStream* st) const { |
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843 size_t used = used_words_in_vs(); |
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844 size_t capacity = capacity_words_in_vs(); |
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845 VirtualSpace* vs = virtual_space(); |
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846 st->print_cr(" space @ " PTR_FORMAT " " SIZE_FORMAT "K, %3d%% used " |
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847 "[" PTR_FORMAT ", " PTR_FORMAT ", " |
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848 PTR_FORMAT ", " PTR_FORMAT ")", |
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849 vs, capacity / K, |
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850 capacity == 0 ? 0 : used * 100 / capacity, |
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851 bottom(), top(), end(), |
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852 vs->high_boundary()); |
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853 } |
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854 |
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855 #ifdef ASSERT |
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856 void VirtualSpaceNode::mangle() { |
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857 size_t word_size = capacity_words_in_vs(); |
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858 Copy::fill_to_words((HeapWord*) low(), word_size, 0xf1f1f1f1); |
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859 } |
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860 #endif // ASSERT |
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861 |
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862 // VirtualSpaceList methods |
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863 // Space allocated from the VirtualSpace |
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864 |
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865 VirtualSpaceList::~VirtualSpaceList() { |
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866 VirtualSpaceListIterator iter(virtual_space_list()); |
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867 while (iter.repeat()) { |
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868 VirtualSpaceNode* vsl = iter.get_next(); |
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869 delete vsl; |
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870 } |
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871 } |
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872 |
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873 size_t VirtualSpaceList::used_words_sum() { |
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874 size_t allocated_by_vs = 0; |
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875 VirtualSpaceListIterator iter(virtual_space_list()); |
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876 while (iter.repeat()) { |
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877 VirtualSpaceNode* vsl = iter.get_next(); |
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878 // Sum used region [bottom, top) in each virtualspace |
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879 allocated_by_vs += vsl->used_words_in_vs(); |
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880 } |
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881 assert(allocated_by_vs >= chunk_manager()->free_chunks_total(), |
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882 err_msg("Total in free chunks " SIZE_FORMAT |
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883 " greater than total from virtual_spaces " SIZE_FORMAT, |
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884 allocated_by_vs, chunk_manager()->free_chunks_total())); |
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885 size_t used = |
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886 allocated_by_vs - chunk_manager()->free_chunks_total(); |
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887 return used; |
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888 } |
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889 |
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890 // Space available in all MetadataVirtualspaces allocated |
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891 // for metadata. This is the upper limit on the capacity |
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892 // of chunks allocated out of all the MetadataVirtualspaces. |
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893 size_t VirtualSpaceList::capacity_words_sum() { |
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894 size_t capacity = 0; |
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895 VirtualSpaceListIterator iter(virtual_space_list()); |
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896 while (iter.repeat()) { |
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897 VirtualSpaceNode* vsl = iter.get_next(); |
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898 capacity += vsl->capacity_words_in_vs(); |
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899 } |
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900 return capacity; |
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901 } |
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902 |
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903 VirtualSpaceList::VirtualSpaceList(size_t word_size ) : |
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904 _is_class(false), |
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905 _virtual_space_list(NULL), |
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906 _current_virtual_space(NULL), |
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907 _virtual_space_total(0), |
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908 _virtual_space_count(0) { |
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909 MutexLockerEx cl(SpaceManager::expand_lock(), |
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910 Mutex::_no_safepoint_check_flag); |
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911 bool initialization_succeeded = grow_vs(word_size); |
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912 |
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913 assert(initialization_succeeded, |
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914 " VirtualSpaceList initialization should not fail"); |
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915 } |
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916 |
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917 VirtualSpaceList::VirtualSpaceList(ReservedSpace rs) : |
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918 _is_class(true), |
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919 _virtual_space_list(NULL), |
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920 _current_virtual_space(NULL), |
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921 _virtual_space_total(0), |
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922 _virtual_space_count(0) { |
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923 MutexLockerEx cl(SpaceManager::expand_lock(), |
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924 Mutex::_no_safepoint_check_flag); |
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925 VirtualSpaceNode* class_entry = new VirtualSpaceNode(rs); |
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926 bool succeeded = class_entry->initialize(); |
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927 assert(succeeded, " VirtualSpaceList initialization should not fail"); |
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928 link_vs(class_entry, rs.size()/BytesPerWord); |
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929 } |
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930 |
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931 // Allocate another meta virtual space and add it to the list. |
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932 bool VirtualSpaceList::grow_vs(size_t vs_word_size) { |
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933 assert_lock_strong(SpaceManager::expand_lock()); |
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934 if (vs_word_size == 0) { |
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935 return false; |
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936 } |
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937 // Reserve the space |
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938 size_t vs_byte_size = vs_word_size * BytesPerWord; |
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939 assert(vs_byte_size % os::vm_page_size() == 0, "Not aligned"); |
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940 |
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941 // Allocate the meta virtual space and initialize it. |
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942 VirtualSpaceNode* new_entry = new VirtualSpaceNode(vs_byte_size); |
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943 if (!new_entry->initialize()) { |
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944 delete new_entry; |
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945 return false; |
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946 } else { |
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947 // ensure lock-free iteration sees fully initialized node |
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948 OrderAccess::storestore(); |
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949 link_vs(new_entry, vs_word_size); |
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950 return true; |
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951 } |
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952 } |
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953 |
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954 void VirtualSpaceList::link_vs(VirtualSpaceNode* new_entry, size_t vs_word_size) { |
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955 if (virtual_space_list() == NULL) { |
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956 set_virtual_space_list(new_entry); |
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957 } else { |
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958 current_virtual_space()->set_next(new_entry); |
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959 } |
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960 set_current_virtual_space(new_entry); |
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961 inc_virtual_space_total(vs_word_size); |
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962 inc_virtual_space_count(); |
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963 #ifdef ASSERT |
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964 new_entry->mangle(); |
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965 #endif |
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966 if (TraceMetavirtualspaceAllocation && Verbose) { |
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967 VirtualSpaceNode* vsl = current_virtual_space(); |
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968 vsl->print_on(tty); |
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969 } |
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970 } |
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971 |
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972 Metachunk* VirtualSpaceList::get_new_chunk(size_t word_size, |
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973 size_t grow_chunks_by_words, |
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974 size_t medium_chunk_bunch) { |
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975 |
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976 // Get a chunk from the chunk freelist |
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977 Metachunk* next = chunk_manager()->chunk_freelist_allocate(grow_chunks_by_words); |
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978 |
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979 // Allocate a chunk out of the current virtual space. |
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980 if (next == NULL) { |
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981 next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words); |
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982 } |
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983 |
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984 if (next == NULL) { |
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985 // Not enough room in current virtual space. Try to commit |
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986 // more space. |
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987 size_t expand_vs_by_words = MAX2(medium_chunk_bunch, |
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988 grow_chunks_by_words); |
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989 size_t page_size_words = os::vm_page_size() / BytesPerWord; |
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990 size_t aligned_expand_vs_by_words = align_size_up(expand_vs_by_words, |
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991 page_size_words); |
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992 bool vs_expanded = |
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993 current_virtual_space()->expand_by(aligned_expand_vs_by_words, false); |
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994 if (!vs_expanded) { |
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995 // Should the capacity of the metaspaces be expanded for |
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996 // this allocation? If it's the virtual space for classes and is |
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997 // being used for CompressedHeaders, don't allocate a new virtualspace. |
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998 if (can_grow() && MetaspaceGC::should_expand(this, word_size)) { |
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999 // Get another virtual space. |
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1000 size_t grow_vs_words = |
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1001 MAX2((size_t)VirtualSpaceSize, aligned_expand_vs_by_words); |
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1002 if (grow_vs(grow_vs_words)) { |
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1003 // Got it. It's on the list now. Get a chunk from it. |
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1004 next = current_virtual_space()->get_chunk_vs_with_expand(grow_chunks_by_words); |
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1005 } |
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1006 } else { |
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1007 // Allocation will fail and induce a GC |
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1008 if (TraceMetadataChunkAllocation && Verbose) { |
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1009 gclog_or_tty->print_cr("VirtualSpaceList::get_new_chunk():" |
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1010 " Fail instead of expand the metaspace"); |
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1011 } |
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1012 } |
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1013 } else { |
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1014 // The virtual space expanded, get a new chunk |
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1015 next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words); |
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1016 assert(next != NULL, "Just expanded, should succeed"); |
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1017 } |
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1018 } |
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1019 |
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1020 assert(next == NULL || (next->next() == NULL && next->prev() == NULL), |
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1021 "New chunk is still on some list"); |
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1022 return next; |
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1023 } |
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1024 |
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1025 Metachunk* VirtualSpaceList::get_initialization_chunk(size_t chunk_word_size, |
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1026 size_t chunk_bunch) { |
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1027 // Get a chunk from the chunk freelist |
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1028 Metachunk* new_chunk = get_new_chunk(chunk_word_size, |
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1029 chunk_word_size, |
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1030 chunk_bunch); |
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1031 return new_chunk; |
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1032 } |
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1033 |
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1034 void VirtualSpaceList::print_on(outputStream* st) const { |
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1035 if (TraceMetadataChunkAllocation && Verbose) { |
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1036 VirtualSpaceListIterator iter(virtual_space_list()); |
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1037 while (iter.repeat()) { |
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1038 VirtualSpaceNode* node = iter.get_next(); |
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1039 node->print_on(st); |
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1040 } |
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1041 } |
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1042 } |
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1043 |
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1044 bool VirtualSpaceList::contains(const void *ptr) { |
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1045 VirtualSpaceNode* list = virtual_space_list(); |
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1046 VirtualSpaceListIterator iter(list); |
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1047 while (iter.repeat()) { |
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1048 VirtualSpaceNode* node = iter.get_next(); |
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1049 if (node->reserved()->contains(ptr)) { |
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1050 return true; |
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1051 } |
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1052 } |
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1053 return false; |
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1054 } |
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1055 |
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1056 |
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1057 // MetaspaceGC methods |
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1058 |
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1059 // VM_CollectForMetadataAllocation is the vm operation used to GC. |
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1060 // Within the VM operation after the GC the attempt to allocate the metadata |
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1061 // should succeed. If the GC did not free enough space for the metaspace |
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1062 // allocation, the HWM is increased so that another virtualspace will be |
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1063 // allocated for the metadata. With perm gen the increase in the perm |
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1064 // gen had bounds, MinMetaspaceExpansion and MaxMetaspaceExpansion. The |
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1065 // metaspace policy uses those as the small and large steps for the HWM. |
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1066 // |
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1067 // After the GC the compute_new_size() for MetaspaceGC is called to |
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1068 // resize the capacity of the metaspaces. The current implementation |
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1069 // is based on the flags MinMetaspaceFreeRatio and MaxHeapFreeRatio used |
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1070 // to resize the Java heap by some GC's. New flags can be implemented |
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1071 // if really needed. MinHeapFreeRatio is used to calculate how much |
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1072 // free space is desirable in the metaspace capacity to decide how much |
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1073 // to increase the HWM. MaxMetaspaceFreeRatio is used to decide how much |
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1074 // free space is desirable in the metaspace capacity before decreasing |
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1075 // the HWM. |
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1076 |
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1077 // Calculate the amount to increase the high water mark (HWM). |
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1078 // Increase by a minimum amount (MinMetaspaceExpansion) so that |
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1079 // another expansion is not requested too soon. If that is not |
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1080 // enough to satisfy the allocation (i.e. big enough for a word_size |
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1081 // allocation), increase by MaxMetaspaceExpansion. If that is still |
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1082 // not enough, expand by the size of the allocation (word_size) plus |
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1083 // some. |
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1084 size_t MetaspaceGC::delta_capacity_until_GC(size_t word_size) { |
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1085 size_t before_inc = MetaspaceGC::capacity_until_GC(); |
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1086 size_t min_delta_words = MinMetaspaceExpansion / BytesPerWord; |
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1087 size_t max_delta_words = MaxMetaspaceExpansion / BytesPerWord; |
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1088 size_t page_size_words = os::vm_page_size() / BytesPerWord; |
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1089 size_t size_delta_words = align_size_up(word_size, page_size_words); |
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1090 size_t delta_words = MAX2(size_delta_words, min_delta_words); |
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1091 if (delta_words > min_delta_words) { |
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1092 // Don't want to hit the high water mark on the next |
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1093 // allocation so make the delta greater than just enough |
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1094 // for this allocation. |
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1095 delta_words = MAX2(delta_words, max_delta_words); |
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1096 if (delta_words > max_delta_words) { |
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1097 // This allocation is large but the next ones are probably not |
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1098 // so increase by the minimum. |
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1099 delta_words = delta_words + min_delta_words; |
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1100 } |
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1101 } |
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1102 return delta_words; |
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1103 } |
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1104 |
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1105 bool MetaspaceGC::should_expand(VirtualSpaceList* vsl, size_t word_size) { |
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1106 |
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1107 // Class virtual space should always be expanded. Call GC for the other |
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1108 // metadata virtual space. |
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1109 if (vsl == Metaspace::class_space_list()) return true; |
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1110 |
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1111 // If the user wants a limit, impose one. |
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1112 size_t max_metaspace_size_words = MaxMetaspaceSize / BytesPerWord; |
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1113 size_t metaspace_size_words = MetaspaceSize / BytesPerWord; |
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1114 if (!FLAG_IS_DEFAULT(MaxMetaspaceSize) && |
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1115 vsl->capacity_words_sum() >= max_metaspace_size_words) { |
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1116 return false; |
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1117 } |
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1118 |
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1119 // If this is part of an allocation after a GC, expand |
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1120 // unconditionally. |
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1121 if(MetaspaceGC::expand_after_GC()) { |
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1122 return true; |
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1123 } |
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1124 |
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1125 // If the capacity is below the minimum capacity, allow the |
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1126 // expansion. Also set the high-water-mark (capacity_until_GC) |
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1127 // to that minimum capacity so that a GC will not be induced |
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1128 // until that minimum capacity is exceeded. |
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1129 if (vsl->capacity_words_sum() < metaspace_size_words || |
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1130 capacity_until_GC() == 0) { |
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1131 set_capacity_until_GC(metaspace_size_words); |
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1132 return true; |
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1133 } else { |
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1134 if (vsl->capacity_words_sum() < capacity_until_GC()) { |
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1135 return true; |
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1136 } else { |
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1137 if (TraceMetadataChunkAllocation && Verbose) { |
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1138 gclog_or_tty->print_cr(" allocation request size " SIZE_FORMAT |
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1139 " capacity_until_GC " SIZE_FORMAT |
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1140 " capacity_words_sum " SIZE_FORMAT |
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1141 " used_words_sum " SIZE_FORMAT |
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1142 " free chunks " SIZE_FORMAT |
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1143 " free chunks count %d", |
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1144 word_size, |
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1145 capacity_until_GC(), |
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1146 vsl->capacity_words_sum(), |
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1147 vsl->used_words_sum(), |
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1148 vsl->chunk_manager()->free_chunks_total(), |
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1149 vsl->chunk_manager()->free_chunks_count()); |
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1150 } |
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1151 return false; |
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1152 } |
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1153 } |
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1154 } |
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1155 |
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1156 // Variables are in bytes |
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1157 |
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1158 void MetaspaceGC::compute_new_size() { |
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1159 assert(_shrink_factor <= 100, "invalid shrink factor"); |
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1160 uint current_shrink_factor = _shrink_factor; |
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1161 _shrink_factor = 0; |
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1162 |
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1163 VirtualSpaceList *vsl = Metaspace::space_list(); |
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1164 |
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1165 size_t capacity_after_gc = vsl->capacity_bytes_sum(); |
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1166 // Check to see if these two can be calculated without walking the CLDG |
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1167 size_t used_after_gc = vsl->used_bytes_sum(); |
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1168 size_t capacity_until_GC = vsl->capacity_bytes_sum(); |
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1169 size_t free_after_gc = capacity_until_GC - used_after_gc; |
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1170 |
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1171 const double minimum_free_percentage = MinMetaspaceFreeRatio / 100.0; |
6725
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1172 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
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1173 |
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1174 const double min_tmp = used_after_gc / maximum_used_percentage; |
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1175 size_t minimum_desired_capacity = |
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1176 (size_t)MIN2(min_tmp, double(max_uintx)); |
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1177 // Don't shrink less than the initial generation size |
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1178 minimum_desired_capacity = MAX2(minimum_desired_capacity, |
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1179 MetaspaceSize); |
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1180 |
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1181 if (PrintGCDetails && Verbose) { |
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1182 const double free_percentage = ((double)free_after_gc) / capacity_until_GC; |
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1183 gclog_or_tty->print_cr("\nMetaspaceGC::compute_new_size: "); |
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1184 gclog_or_tty->print_cr(" " |
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1185 " minimum_free_percentage: %6.2f" |
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1186 " maximum_used_percentage: %6.2f", |
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1187 minimum_free_percentage, |
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1188 maximum_used_percentage); |
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1189 double d_free_after_gc = free_after_gc / (double) K; |
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1190 gclog_or_tty->print_cr(" " |
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1191 " free_after_gc : %6.1fK" |
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1192 " used_after_gc : %6.1fK" |
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1193 " capacity_after_gc : %6.1fK" |
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1194 " metaspace HWM : %6.1fK", |
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1195 free_after_gc / (double) K, |
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1196 used_after_gc / (double) K, |
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1197 capacity_after_gc / (double) K, |
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1198 capacity_until_GC / (double) K); |
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1199 gclog_or_tty->print_cr(" " |
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1200 " free_percentage: %6.2f", |
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1201 free_percentage); |
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1202 } |
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1203 |
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1204 |
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1205 if (capacity_until_GC < minimum_desired_capacity) { |
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1206 // If we have less capacity below the metaspace HWM, then |
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1207 // increment the HWM. |
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1208 size_t expand_bytes = minimum_desired_capacity - capacity_until_GC; |
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1209 // Don't expand unless it's significant |
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1210 if (expand_bytes >= MinMetaspaceExpansion) { |
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1211 size_t expand_words = expand_bytes / BytesPerWord; |
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1212 MetaspaceGC::inc_capacity_until_GC(expand_words); |
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1213 } |
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1214 if (PrintGCDetails && Verbose) { |
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1215 size_t new_capacity_until_GC = MetaspaceGC::capacity_until_GC_in_bytes(); |
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1216 gclog_or_tty->print_cr(" expanding:" |
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1217 " minimum_desired_capacity: %6.1fK" |
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1218 " expand_words: %6.1fK" |
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1219 " MinMetaspaceExpansion: %6.1fK" |
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1220 " new metaspace HWM: %6.1fK", |
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1221 minimum_desired_capacity / (double) K, |
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1222 expand_bytes / (double) K, |
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1223 MinMetaspaceExpansion / (double) K, |
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1224 new_capacity_until_GC / (double) K); |
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1225 } |
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1226 return; |
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1227 } |
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1228 |
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1229 // No expansion, now see if we want to shrink |
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1230 size_t shrink_words = 0; |
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1231 // We would never want to shrink more than this |
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1232 size_t max_shrink_words = capacity_until_GC - minimum_desired_capacity; |
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1233 assert(max_shrink_words >= 0, err_msg("max_shrink_words " SIZE_FORMAT, |
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|
1234 max_shrink_words)); |
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|
1235 |
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1236 // Should shrinking be considered? |
8040
a83cd101fd62
8005452: NPG: Create new flags for Metaspace resizing policy
jmasa
parents:
8007
diff
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|
1237 if (MaxMetaspaceFreeRatio < 100) { |
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8005452: NPG: Create new flags for Metaspace resizing policy
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parents:
8007
diff
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|
1238 const double maximum_free_percentage = MaxMetaspaceFreeRatio / 100.0; |
6725
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1239 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
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1240 const double max_tmp = used_after_gc / minimum_used_percentage; |
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1241 size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(max_uintx)); |
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|
1242 maximum_desired_capacity = MAX2(maximum_desired_capacity, |
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|
1243 MetaspaceSize); |
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1244 if (PrintGC && Verbose) { |
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|
1245 gclog_or_tty->print_cr(" " |
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6964458: Reimplement class meta-data storage to use native memory
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parents:
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changeset
|
1246 " maximum_free_percentage: %6.2f" |
da91efe96a93
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parents:
diff
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|
1247 " minimum_used_percentage: %6.2f", |
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coleenp
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|
1248 maximum_free_percentage, |
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|
1249 minimum_used_percentage); |
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|
1250 gclog_or_tty->print_cr(" " |
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parents:
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|
1251 " capacity_until_GC: %6.1fK" |
da91efe96a93
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coleenp
parents:
diff
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|
1252 " minimum_desired_capacity: %6.1fK" |
da91efe96a93
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coleenp
parents:
diff
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|
1253 " maximum_desired_capacity: %6.1fK", |
da91efe96a93
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coleenp
parents:
diff
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|
1254 capacity_until_GC / (double) K, |
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coleenp
parents:
diff
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|
1255 minimum_desired_capacity / (double) K, |
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coleenp
parents:
diff
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|
1256 maximum_desired_capacity / (double) K); |
da91efe96a93
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parents:
diff
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|
1257 } |
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|
1258 |
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1259 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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1260 "sanity check"); |
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1261 |
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1262 if (capacity_until_GC > maximum_desired_capacity) { |
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1263 // Capacity too large, compute shrinking size |
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1264 shrink_words = capacity_until_GC - maximum_desired_capacity; |
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1265 // We don't want shrink all the way back to initSize if people call |
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1266 // System.gc(), because some programs do that between "phases" and then |
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1267 // we'd just have to grow the heap up again for the next phase. So we |
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1268 // damp the shrinking: 0% on the first call, 10% on the second call, 40% |
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1269 // on the third call, and 100% by the fourth call. But if we recompute |
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1270 // size without shrinking, it goes back to 0%. |
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1271 shrink_words = shrink_words / 100 * current_shrink_factor; |
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1272 assert(shrink_words <= max_shrink_words, |
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1273 err_msg("invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT, |
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parents:
diff
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|
1274 shrink_words, max_shrink_words)); |
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|
1275 if (current_shrink_factor == 0) { |
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coleenp
parents:
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|
1276 _shrink_factor = 10; |
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|
1277 } else { |
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|
1278 _shrink_factor = MIN2(current_shrink_factor * 4, (uint) 100); |
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parents:
diff
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|
1279 } |
da91efe96a93
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|
1280 if (PrintGCDetails && Verbose) { |
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parents:
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|
1281 gclog_or_tty->print_cr(" " |
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coleenp
parents:
diff
changeset
|
1282 " shrinking:" |
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coleenp
parents:
diff
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|
1283 " initSize: %.1fK" |
da91efe96a93
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coleenp
parents:
diff
changeset
|
1284 " maximum_desired_capacity: %.1fK", |
da91efe96a93
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coleenp
parents:
diff
changeset
|
1285 MetaspaceSize / (double) K, |
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coleenp
parents:
diff
changeset
|
1286 maximum_desired_capacity / (double) K); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
1287 gclog_or_tty->print_cr(" " |
da91efe96a93
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coleenp
parents:
diff
changeset
|
1288 " shrink_words: %.1fK" |
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coleenp
parents:
diff
changeset
|
1289 " current_shrink_factor: %d" |
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coleenp
parents:
diff
changeset
|
1290 " new shrink factor: %d" |
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coleenp
parents:
diff
changeset
|
1291 " MinMetaspaceExpansion: %.1fK", |
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coleenp
parents:
diff
changeset
|
1292 shrink_words / (double) K, |
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coleenp
parents:
diff
changeset
|
1293 current_shrink_factor, |
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coleenp
parents:
diff
changeset
|
1294 _shrink_factor, |
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coleenp
parents:
diff
changeset
|
1295 MinMetaspaceExpansion / (double) K); |
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coleenp
parents:
diff
changeset
|
1296 } |
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diff
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|
1297 } |
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|
1298 } |
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|
1299 |
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|
1300 |
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1301 // Don't shrink unless it's significant |
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1302 if (shrink_words >= MinMetaspaceExpansion) { |
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|
1303 VirtualSpaceNode* csp = vsl->current_virtual_space(); |
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1304 size_t available_to_shrink = csp->capacity_words_in_vs() - |
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diff
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|
1305 csp->used_words_in_vs(); |
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diff
changeset
|
1306 shrink_words = MIN2(shrink_words, available_to_shrink); |
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parents:
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|
1307 csp->shrink_by(shrink_words); |
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parents:
diff
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|
1308 MetaspaceGC::dec_capacity_until_GC(shrink_words); |
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|
1309 if (PrintGCDetails && Verbose) { |
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|
1310 size_t new_capacity_until_GC = MetaspaceGC::capacity_until_GC_in_bytes(); |
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1311 gclog_or_tty->print_cr(" metaspace HWM: %.1fK", new_capacity_until_GC / (double) K); |
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|
1312 } |
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6964458: Reimplement class meta-data storage to use native memory
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|
1313 } |
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|
1314 assert(vsl->used_bytes_sum() == used_after_gc && |
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|
1315 used_after_gc <= vsl->capacity_bytes_sum(), |
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|
1316 "sanity check"); |
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|
1317 |
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|
1318 } |
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|
1319 |
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|
1320 // Metadebug methods |
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|
1321 |
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|
1322 void Metadebug::deallocate_chunk_a_lot(SpaceManager* sm, |
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|
1323 size_t chunk_word_size){ |
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|
1324 #ifdef ASSERT |
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1325 VirtualSpaceList* vsl = sm->vs_list(); |
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|
1326 if (MetaDataDeallocateALot && |
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|
1327 Metadebug::deallocate_chunk_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) { |
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|
1328 Metadebug::reset_deallocate_chunk_a_lot_count(); |
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1329 for (uint i = 0; i < metadata_deallocate_a_lock_chunk; i++) { |
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1330 Metachunk* dummy_chunk = vsl->current_virtual_space()->take_from_committed(chunk_word_size); |
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|
1331 if (dummy_chunk == NULL) { |
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|
1332 break; |
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parents:
diff
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|
1333 } |
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1334 vsl->chunk_manager()->chunk_freelist_deallocate(dummy_chunk); |
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|
1335 |
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|
1336 if (TraceMetadataChunkAllocation && Verbose) { |
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|
1337 gclog_or_tty->print("Metadebug::deallocate_chunk_a_lot: %d) ", |
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|
1338 sm->sum_count_in_chunks_in_use()); |
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|
1339 dummy_chunk->print_on(gclog_or_tty); |
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1340 gclog_or_tty->print_cr(" Free chunks total %d count %d", |
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|
1341 vsl->chunk_manager()->free_chunks_total(), |
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|
1342 vsl->chunk_manager()->free_chunks_count()); |
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|
1343 } |
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|
1344 } |
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|
1345 } else { |
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|
1346 Metadebug::inc_deallocate_chunk_a_lot_count(); |
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|
1347 } |
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|
1348 #endif |
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|
1349 } |
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|
1350 |
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1351 void Metadebug::deallocate_block_a_lot(SpaceManager* sm, |
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|
1352 size_t raw_word_size){ |
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|
1353 #ifdef ASSERT |
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1354 if (MetaDataDeallocateALot && |
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1355 Metadebug::deallocate_block_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) { |
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1356 Metadebug::set_deallocate_block_a_lot_count(0); |
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|
1357 for (uint i = 0; i < metadata_deallocate_a_lot_block; i++) { |
6885 | 1358 MetaWord* dummy_block = sm->allocate_work(raw_word_size); |
6725
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|
1359 if (dummy_block == 0) { |
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|
1360 break; |
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|
1361 } |
6885 | 1362 sm->deallocate(dummy_block, raw_word_size); |
6725
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|
1363 } |
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1364 } else { |
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1365 Metadebug::inc_deallocate_block_a_lot_count(); |
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1366 } |
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1367 #endif |
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1368 } |
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1369 |
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1370 void Metadebug::init_allocation_fail_alot_count() { |
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1371 if (MetadataAllocationFailALot) { |
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1372 _allocation_fail_alot_count = |
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1373 1+(long)((double)MetadataAllocationFailALotInterval*os::random()/(max_jint+1.0)); |
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1374 } |
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1375 } |
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1376 |
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1377 #ifdef ASSERT |
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1378 bool Metadebug::test_metadata_failure() { |
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1379 if (MetadataAllocationFailALot && |
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1380 Threads::is_vm_complete()) { |
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1381 if (_allocation_fail_alot_count > 0) { |
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1382 _allocation_fail_alot_count--; |
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1383 } else { |
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1384 if (TraceMetadataChunkAllocation && Verbose) { |
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1385 gclog_or_tty->print_cr("Metadata allocation failing for " |
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1386 "MetadataAllocationFailALot"); |
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1387 } |
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1388 init_allocation_fail_alot_count(); |
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1389 return true; |
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1390 } |
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1391 } |
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1392 return false; |
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1393 } |
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1394 #endif |
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1395 |
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1396 // ChunkList methods |
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1397 |
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1398 size_t ChunkList::sum_list_size() { |
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1399 size_t result = 0; |
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1400 Metachunk* cur = head(); |
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1401 while (cur != NULL) { |
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1402 result += cur->word_size(); |
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1403 cur = cur->next(); |
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1404 } |
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1405 return result; |
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1406 } |
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1407 |
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1408 size_t ChunkList::sum_list_count() { |
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1409 size_t result = 0; |
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1410 Metachunk* cur = head(); |
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1411 while (cur != NULL) { |
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1412 result++; |
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1413 cur = cur->next(); |
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1414 } |
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1415 return result; |
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1416 } |
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1417 |
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1418 size_t ChunkList::sum_list_capacity() { |
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1419 size_t result = 0; |
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1420 Metachunk* cur = head(); |
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1421 while (cur != NULL) { |
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1422 result += cur->capacity_word_size(); |
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1423 cur = cur->next(); |
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1424 } |
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1425 return result; |
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1426 } |
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1427 |
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1428 void ChunkList::add_at_head(Metachunk* head, Metachunk* tail) { |
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1429 assert_lock_strong(SpaceManager::expand_lock()); |
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1430 assert(head == tail || tail->next() == NULL, |
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1431 "Not the tail or the head has already been added to a list"); |
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1432 |
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1433 if (TraceMetadataChunkAllocation && Verbose) { |
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1434 gclog_or_tty->print("ChunkList::add_at_head(head, tail): "); |
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1435 Metachunk* cur = head; |
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1436 while (cur != NULL) { |
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1437 gclog_or_tty->print(PTR_FORMAT " (" SIZE_FORMAT ") ", cur, cur->word_size()); |
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1438 cur = cur->next(); |
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1439 } |
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1440 gclog_or_tty->print_cr(""); |
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1441 } |
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1442 |
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1443 if (tail != NULL) { |
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1444 tail->set_next(_head); |
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1445 } |
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1446 set_head(head); |
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1447 } |
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1448 |
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1449 void ChunkList::add_at_head(Metachunk* list) { |
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1450 if (list == NULL) { |
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1451 // Nothing to add |
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1452 return; |
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1453 } |
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1454 assert_lock_strong(SpaceManager::expand_lock()); |
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1455 Metachunk* head = list; |
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1456 Metachunk* tail = list; |
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1457 Metachunk* cur = head->next(); |
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1458 // Search for the tail since it is not passed. |
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1459 while (cur != NULL) { |
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1460 tail = cur; |
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1461 cur = cur->next(); |
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1462 } |
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1463 add_at_head(head, tail); |
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1464 } |
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1465 |
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1466 // ChunkManager methods |
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1467 |
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1468 // Verification of _free_chunks_total and _free_chunks_count does not |
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1469 // work with the CMS collector because its use of additional locks |
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1470 // complicate the mutex deadlock detection but it can still be useful |
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1471 // for detecting errors in the chunk accounting with other collectors. |
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1472 |
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1473 size_t ChunkManager::free_chunks_total() { |
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1474 #ifdef ASSERT |
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1475 if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) { |
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1476 MutexLockerEx cl(SpaceManager::expand_lock(), |
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1477 Mutex::_no_safepoint_check_flag); |
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1478 slow_locked_verify_free_chunks_total(); |
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1479 } |
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1480 #endif |
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1481 return _free_chunks_total; |
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1482 } |
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1483 |
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1484 size_t ChunkManager::free_chunks_total_in_bytes() { |
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1485 return free_chunks_total() * BytesPerWord; |
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|
1486 } |
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|
1487 |
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1488 size_t ChunkManager::free_chunks_count() { |
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1489 #ifdef ASSERT |
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1490 if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) { |
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1491 MutexLockerEx cl(SpaceManager::expand_lock(), |
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1492 Mutex::_no_safepoint_check_flag); |
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1493 // This lock is only needed in debug because the verification |
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1494 // of the _free_chunks_totals walks the list of free chunks |
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1495 slow_locked_verify_free_chunks_count(); |
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1496 } |
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1497 #endif |
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1498 return _free_chunks_count; |
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1499 } |
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1500 |
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1501 void ChunkManager::locked_verify_free_chunks_total() { |
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1502 assert_lock_strong(SpaceManager::expand_lock()); |
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1503 assert(sum_free_chunks() == _free_chunks_total, |
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1504 err_msg("_free_chunks_total " SIZE_FORMAT " is not the" |
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1505 " same as sum " SIZE_FORMAT, _free_chunks_total, |
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1506 sum_free_chunks())); |
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1507 } |
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1508 |
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1509 void ChunkManager::verify_free_chunks_total() { |
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1510 MutexLockerEx cl(SpaceManager::expand_lock(), |
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1511 Mutex::_no_safepoint_check_flag); |
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1512 locked_verify_free_chunks_total(); |
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1513 } |
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1514 |
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1515 void ChunkManager::locked_verify_free_chunks_count() { |
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1516 assert_lock_strong(SpaceManager::expand_lock()); |
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1517 assert(sum_free_chunks_count() == _free_chunks_count, |
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1518 err_msg("_free_chunks_count " SIZE_FORMAT " is not the" |
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1519 " same as sum " SIZE_FORMAT, _free_chunks_count, |
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1520 sum_free_chunks_count())); |
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1521 } |
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1522 |
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1523 void ChunkManager::verify_free_chunks_count() { |
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1524 #ifdef ASSERT |
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1525 MutexLockerEx cl(SpaceManager::expand_lock(), |
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1526 Mutex::_no_safepoint_check_flag); |
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1527 locked_verify_free_chunks_count(); |
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1528 #endif |
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1529 } |
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1530 |
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1531 void ChunkManager::verify() { |
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1532 MutexLockerEx cl(SpaceManager::expand_lock(), |
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1533 Mutex::_no_safepoint_check_flag); |
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1534 locked_verify(); |
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1535 } |
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1536 |
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1537 void ChunkManager::locked_verify() { |
6885 | 1538 locked_verify_free_chunks_count(); |
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1539 locked_verify_free_chunks_total(); |
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1540 } |
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1541 |
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1542 void ChunkManager::locked_print_free_chunks(outputStream* st) { |
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1543 assert_lock_strong(SpaceManager::expand_lock()); |
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1544 st->print_cr("Free chunk total " SIZE_FORMAT " count " SIZE_FORMAT, |
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1545 _free_chunks_total, _free_chunks_count); |
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1546 } |
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1547 |
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1548 void ChunkManager::locked_print_sum_free_chunks(outputStream* st) { |
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1549 assert_lock_strong(SpaceManager::expand_lock()); |
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1550 st->print_cr("Sum free chunk total " SIZE_FORMAT " count " SIZE_FORMAT, |
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1551 sum_free_chunks(), sum_free_chunks_count()); |
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1552 } |
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1553 ChunkList* ChunkManager::free_chunks(ChunkIndex index) { |
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1554 return &_free_chunks[index]; |
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1555 } |
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1556 |
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1557 // These methods that sum the free chunk lists are used in printing |
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1558 // methods that are used in product builds. |
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1559 size_t ChunkManager::sum_free_chunks() { |
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1560 assert_lock_strong(SpaceManager::expand_lock()); |
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1561 size_t result = 0; |
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1562 for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) { |
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1563 ChunkList* list = free_chunks(i); |
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1564 |
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1565 if (list == NULL) { |
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1566 continue; |
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1567 } |
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1568 |
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1569 result = result + list->sum_list_capacity(); |
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1570 } |
6885 | 1571 result = result + humongous_dictionary()->total_size(); |
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1572 return result; |
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1573 } |
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1574 |
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1575 size_t ChunkManager::sum_free_chunks_count() { |
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1576 assert_lock_strong(SpaceManager::expand_lock()); |
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1577 size_t count = 0; |
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1578 for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) { |
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1579 ChunkList* list = free_chunks(i); |
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1580 if (list == NULL) { |
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1581 continue; |
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1582 } |
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1583 count = count + list->sum_list_count(); |
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1584 } |
6885 | 1585 count = count + humongous_dictionary()->total_free_blocks(); |
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1586 return count; |
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1587 } |
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1588 |
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1589 ChunkList* ChunkManager::find_free_chunks_list(size_t word_size) { |
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1590 ChunkIndex index = list_index(word_size); |
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1591 assert(index < HumongousIndex, "No humongous list"); |
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1592 return free_chunks(index); |
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1593 } |
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1594 |
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1595 void ChunkManager::free_chunks_put(Metachunk* chunk) { |
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1596 assert_lock_strong(SpaceManager::expand_lock()); |
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1597 ChunkList* free_list = find_free_chunks_list(chunk->word_size()); |
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1598 chunk->set_next(free_list->head()); |
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1599 free_list->set_head(chunk); |
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1600 // chunk is being returned to the chunk free list |
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1601 inc_free_chunks_total(chunk->capacity_word_size()); |
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1602 slow_locked_verify(); |
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1603 } |
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1604 |
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1605 void ChunkManager::chunk_freelist_deallocate(Metachunk* chunk) { |
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1606 // The deallocation of a chunk originates in the freelist |
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1607 // manangement code for a Metaspace and does not hold the |
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1608 // lock. |
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1609 assert(chunk != NULL, "Deallocating NULL"); |
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1610 assert_lock_strong(SpaceManager::expand_lock()); |
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1611 slow_locked_verify(); |
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1612 if (TraceMetadataChunkAllocation) { |
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1613 tty->print_cr("ChunkManager::chunk_freelist_deallocate: chunk " |
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1614 PTR_FORMAT " size " SIZE_FORMAT, |
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1615 chunk, chunk->word_size()); |
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1616 } |
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1617 free_chunks_put(chunk); |
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1618 } |
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1619 |
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1620 Metachunk* ChunkManager::free_chunks_get(size_t word_size) { |
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1621 assert_lock_strong(SpaceManager::expand_lock()); |
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1622 |
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1623 slow_locked_verify(); |
6885 | 1624 |
1625 Metachunk* chunk = NULL; | |
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1626 if (list_index(word_size) != HumongousIndex) { |
6885 | 1627 ChunkList* free_list = find_free_chunks_list(word_size); |
1628 assert(free_list != NULL, "Sanity check"); | |
1629 | |
1630 chunk = free_list->head(); | |
1631 debug_only(Metachunk* debug_head = chunk;) | |
1632 | |
1633 if (chunk == NULL) { | |
1634 return NULL; | |
1635 } | |
1636 | |
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1637 // Remove the chunk as the head of the list. |
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1638 free_list->set_head(chunk->next()); |
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1639 |
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1640 // Chunk is being removed from the chunks free list. |
6885 | 1641 dec_free_chunks_total(chunk->capacity_word_size()); |
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1642 |
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1643 if (TraceMetadataChunkAllocation && Verbose) { |
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1644 tty->print_cr("ChunkManager::free_chunks_get: free_list " |
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1645 PTR_FORMAT " head " PTR_FORMAT " size " SIZE_FORMAT, |
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1646 free_list, chunk, chunk->word_size()); |
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|
1647 } |
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1648 } else { |
6885 | 1649 chunk = humongous_dictionary()->get_chunk( |
1650 word_size, | |
1651 FreeBlockDictionary<Metachunk>::atLeast); | |
1652 | |
1653 if (chunk != NULL) { | |
1654 if (TraceMetadataHumongousAllocation) { | |
1655 size_t waste = chunk->word_size() - word_size; | |
1656 tty->print_cr("Free list allocate humongous chunk size " SIZE_FORMAT | |
1657 " for requested size " SIZE_FORMAT | |
1658 " waste " SIZE_FORMAT, | |
1659 chunk->word_size(), word_size, waste); | |
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1660 } |
6885 | 1661 // Chunk is being removed from the chunks free list. |
1662 dec_free_chunks_total(chunk->capacity_word_size()); | |
1663 #ifdef ASSERT | |
1664 chunk->set_is_free(false); | |
1665 #endif | |
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1666 } else { |
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1667 return NULL; |
6885 | 1668 } |
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|
1669 } |
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1670 |
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1671 // Remove it from the links to this freelist |
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1672 chunk->set_next(NULL); |
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1673 chunk->set_prev(NULL); |
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|
1674 slow_locked_verify(); |
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1675 return chunk; |
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|
1676 } |
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|
1677 |
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1678 Metachunk* ChunkManager::chunk_freelist_allocate(size_t word_size) { |
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1679 assert_lock_strong(SpaceManager::expand_lock()); |
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|
1680 slow_locked_verify(); |
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1681 |
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1682 // Take from the beginning of the list |
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1683 Metachunk* chunk = free_chunks_get(word_size); |
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1684 if (chunk == NULL) { |
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1685 return NULL; |
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|
1686 } |
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|
1687 |
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1688 assert((word_size <= chunk->word_size()) || |
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1689 list_index(chunk->word_size() == HumongousIndex), |
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1690 "Non-humongous variable sized chunk"); |
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1691 if (TraceMetadataChunkAllocation) { |
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1692 size_t list_count; |
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1693 if (list_index(word_size) < HumongousIndex) { |
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1694 ChunkList* list = find_free_chunks_list(word_size); |
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1695 list_count = list->sum_list_count(); |
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1696 } else { |
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1697 list_count = humongous_dictionary()->total_count(); |
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1698 } |
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|
1699 tty->print("ChunkManager::chunk_freelist_allocate: " PTR_FORMAT " chunk " |
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1700 PTR_FORMAT " size " SIZE_FORMAT " count " SIZE_FORMAT " ", |
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|
1701 this, chunk, chunk->word_size(), list_count); |
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1702 locked_print_free_chunks(tty); |
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|
1703 } |
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|
1704 |
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1705 return chunk; |
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|
1706 } |
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|
1707 |
6885 | 1708 void ChunkManager::print_on(outputStream* out) { |
1709 if (PrintFLSStatistics != 0) { | |
1710 humongous_dictionary()->report_statistics(); | |
1711 } | |
1712 } | |
1713 | |
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1714 // SpaceManager methods |
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1715 |
7446
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1716 void SpaceManager::get_initial_chunk_sizes(Metaspace::MetaspaceType type, |
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1717 size_t* chunk_word_size, |
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1718 size_t* class_chunk_word_size) { |
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1719 switch (type) { |
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1720 case Metaspace::BootMetaspaceType: |
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1721 *chunk_word_size = Metaspace::first_chunk_word_size(); |
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1722 *class_chunk_word_size = Metaspace::first_class_chunk_word_size(); |
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|
1723 break; |
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|
1724 case Metaspace::ROMetaspaceType: |
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1725 *chunk_word_size = SharedReadOnlySize / wordSize; |
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|
1726 *class_chunk_word_size = ClassSpecializedChunk; |
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|
1727 break; |
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|
1728 case Metaspace::ReadWriteMetaspaceType: |
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|
1729 *chunk_word_size = SharedReadWriteSize / wordSize; |
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1730 *class_chunk_word_size = ClassSpecializedChunk; |
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|
1731 break; |
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|
1732 case Metaspace::AnonymousMetaspaceType: |
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|
1733 case Metaspace::ReflectionMetaspaceType: |
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|
1734 *chunk_word_size = SpecializedChunk; |
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|
1735 *class_chunk_word_size = ClassSpecializedChunk; |
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|
1736 break; |
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|
1737 default: |
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|
1738 *chunk_word_size = SmallChunk; |
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|
1739 *class_chunk_word_size = ClassSmallChunk; |
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|
1740 break; |
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|
1741 } |
8007
d9058e388631
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mikael
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7447
diff
changeset
|
1742 assert(*chunk_word_size != 0 && *class_chunk_word_size != 0, |
7446
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|
1743 err_msg("Initial chunks sizes bad: data " SIZE_FORMAT |
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|
1744 " class " SIZE_FORMAT, |
8007
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7447
diff
changeset
|
1745 *chunk_word_size, *class_chunk_word_size)); |
7446
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|
1746 } |
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|
1747 |
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1748 size_t SpaceManager::sum_free_in_chunks_in_use() const { |
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1749 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
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1750 size_t free = 0; |
7446
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1751 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
6725
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|
1752 Metachunk* chunk = chunks_in_use(i); |
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|
1753 while (chunk != NULL) { |
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1754 free += chunk->free_word_size(); |
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|
1755 chunk = chunk->next(); |
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|
1756 } |
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|
1757 } |
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|
1758 return free; |
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|
1759 } |
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|
1760 |
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|
1761 size_t SpaceManager::sum_waste_in_chunks_in_use() const { |
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|
1762 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
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|
1763 size_t result = 0; |
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1764 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
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|
1765 result += sum_waste_in_chunks_in_use(i); |
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|
1766 } |
6885 | 1767 |
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|
1768 return result; |
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|
1769 } |
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|
1770 |
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|
1771 size_t SpaceManager::sum_waste_in_chunks_in_use(ChunkIndex index) const { |
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|
1772 size_t result = 0; |
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|
1773 Metachunk* chunk = chunks_in_use(index); |
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|
1774 // Count the free space in all the chunk but not the |
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|
1775 // current chunk from which allocations are still being done. |
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|
1776 if (chunk != NULL) { |
6885 | 1777 Metachunk* prev = chunk; |
1778 while (chunk != NULL && chunk != current_chunk()) { | |
1779 result += chunk->free_word_size(); | |
1780 prev = chunk; | |
6725
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|
1781 chunk = chunk->next(); |
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|
1782 } |
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|
1783 } |
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|
1784 return result; |
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|
1785 } |
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|
1786 |
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|
1787 size_t SpaceManager::sum_capacity_in_chunks_in_use() const { |
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1788 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
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1789 size_t sum = 0; |
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1790 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
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1791 Metachunk* chunk = chunks_in_use(i); |
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1792 while (chunk != NULL) { |
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1793 // Just changed this sum += chunk->capacity_word_size(); |
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1794 // sum += chunk->word_size() - Metachunk::overhead(); |
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1795 sum += chunk->capacity_word_size(); |
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1796 chunk = chunk->next(); |
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1797 } |
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1798 } |
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1799 return sum; |
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1800 } |
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1801 |
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1802 size_t SpaceManager::sum_count_in_chunks_in_use() { |
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1803 size_t count = 0; |
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1804 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
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1805 count = count + sum_count_in_chunks_in_use(i); |
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1806 } |
6885 | 1807 |
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1808 return count; |
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1809 } |
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1810 |
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1811 size_t SpaceManager::sum_count_in_chunks_in_use(ChunkIndex i) { |
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1812 size_t count = 0; |
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1813 Metachunk* chunk = chunks_in_use(i); |
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1814 while (chunk != NULL) { |
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1815 count++; |
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1816 chunk = chunk->next(); |
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1817 } |
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1818 return count; |
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1819 } |
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1820 |
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1821 |
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1822 size_t SpaceManager::sum_used_in_chunks_in_use() const { |
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1823 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
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1824 size_t used = 0; |
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1825 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
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1826 Metachunk* chunk = chunks_in_use(i); |
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1827 while (chunk != NULL) { |
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1828 used += chunk->used_word_size(); |
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1829 chunk = chunk->next(); |
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1830 } |
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1831 } |
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1832 return used; |
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1833 } |
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1834 |
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1835 void SpaceManager::locked_print_chunks_in_use_on(outputStream* st) const { |
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1836 |
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1837 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
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1838 Metachunk* chunk = chunks_in_use(i); |
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1839 st->print("SpaceManager: %s " PTR_FORMAT, |
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1840 chunk_size_name(i), chunk); |
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1841 if (chunk != NULL) { |
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1842 st->print_cr(" free " SIZE_FORMAT, |
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1843 chunk->free_word_size()); |
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1844 } else { |
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1845 st->print_cr(""); |
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1846 } |
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1847 } |
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1848 |
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1849 vs_list()->chunk_manager()->locked_print_free_chunks(st); |
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1850 vs_list()->chunk_manager()->locked_print_sum_free_chunks(st); |
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1851 } |
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1852 |
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1853 size_t SpaceManager::calc_chunk_size(size_t word_size) { |
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1854 |
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1855 // Decide between a small chunk and a medium chunk. Up to |
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1856 // _small_chunk_limit small chunks can be allocated but |
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1857 // once a medium chunk has been allocated, no more small |
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1858 // chunks will be allocated. |
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1859 size_t chunk_word_size; |
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1860 if (chunks_in_use(MediumIndex) == NULL && |
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1861 (!has_small_chunk_limit() || |
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1862 sum_count_in_chunks_in_use(SmallIndex) < _small_chunk_limit)) { |
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1863 chunk_word_size = (size_t) small_chunk_size(); |
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1864 if (word_size + Metachunk::overhead() > small_chunk_size()) { |
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1865 chunk_word_size = medium_chunk_size(); |
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1866 } |
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1867 } else { |
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1868 chunk_word_size = medium_chunk_size(); |
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1869 } |
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1870 |
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1871 // Might still need a humongous chunk. Enforce an |
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1872 // eight word granularity to facilitate reuse (some |
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1873 // wastage but better chance of reuse). |
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1874 size_t if_humongous_sized_chunk = |
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1875 align_size_up(word_size + Metachunk::overhead(), |
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1876 HumongousChunkGranularity); |
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1877 chunk_word_size = |
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1878 MAX2((size_t) chunk_word_size, if_humongous_sized_chunk); |
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1879 |
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1880 assert(!SpaceManager::is_humongous(word_size) || |
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1881 chunk_word_size == if_humongous_sized_chunk, |
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1882 err_msg("Size calculation is wrong, word_size " SIZE_FORMAT |
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1883 " chunk_word_size " SIZE_FORMAT, |
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1884 word_size, chunk_word_size)); |
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1885 if (TraceMetadataHumongousAllocation && |
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1886 SpaceManager::is_humongous(word_size)) { |
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1887 gclog_or_tty->print_cr("Metadata humongous allocation:"); |
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1888 gclog_or_tty->print_cr(" word_size " PTR_FORMAT, word_size); |
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1889 gclog_or_tty->print_cr(" chunk_word_size " PTR_FORMAT, |
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1890 chunk_word_size); |
6885 | 1891 gclog_or_tty->print_cr(" chunk overhead " PTR_FORMAT, |
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1892 Metachunk::overhead()); |
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1893 } |
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1894 return chunk_word_size; |
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1895 } |
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1896 |
6885 | 1897 MetaWord* SpaceManager::grow_and_allocate(size_t word_size) { |
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1898 assert(vs_list()->current_virtual_space() != NULL, |
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1899 "Should have been set"); |
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1900 assert(current_chunk() == NULL || |
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1901 current_chunk()->allocate(word_size) == NULL, |
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1902 "Don't need to expand"); |
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1903 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag); |
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1904 |
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1905 if (TraceMetadataChunkAllocation && Verbose) { |
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1906 size_t words_left = 0; |
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1907 size_t words_used = 0; |
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1908 if (current_chunk() != NULL) { |
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1909 words_left = current_chunk()->free_word_size(); |
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1910 words_used = current_chunk()->used_word_size(); |
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1911 } |
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1912 gclog_or_tty->print_cr("SpaceManager::grow_and_allocate for " SIZE_FORMAT |
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1913 " words " SIZE_FORMAT " words used " SIZE_FORMAT |
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1914 " words left", |
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1915 word_size, words_used, words_left); |
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1916 } |
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1917 |
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1918 // Get another chunk out of the virtual space |
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1919 size_t grow_chunks_by_words = calc_chunk_size(word_size); |
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1920 Metachunk* next = get_new_chunk(word_size, grow_chunks_by_words); |
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1921 |
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1922 // If a chunk was available, add it to the in-use chunk list |
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1923 // and do an allocation from it. |
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1924 if (next != NULL) { |
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1925 Metadebug::deallocate_chunk_a_lot(this, grow_chunks_by_words); |
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1926 // Add to this manager's list of chunks in use. |
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1927 add_chunk(next, false); |
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1928 return next->allocate(word_size); |
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1929 } |
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1930 return NULL; |
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1931 } |
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1932 |
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1933 void SpaceManager::print_on(outputStream* st) const { |
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1934 |
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1935 for (ChunkIndex i = ZeroIndex; |
6885 | 1936 i < NumberOfInUseLists ; |
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1937 i = next_chunk_index(i) ) { |
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1938 st->print_cr(" chunks_in_use " PTR_FORMAT " chunk size " PTR_FORMAT, |
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1939 chunks_in_use(i), |
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1940 chunks_in_use(i) == NULL ? 0 : chunks_in_use(i)->word_size()); |
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1941 } |
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1942 st->print_cr(" waste: Small " SIZE_FORMAT " Medium " SIZE_FORMAT |
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1943 " Humongous " SIZE_FORMAT, |
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1944 sum_waste_in_chunks_in_use(SmallIndex), |
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1945 sum_waste_in_chunks_in_use(MediumIndex), |
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1946 sum_waste_in_chunks_in_use(HumongousIndex)); |
6885 | 1947 // block free lists |
1948 if (block_freelists() != NULL) { | |
1949 st->print_cr("total in block free lists " SIZE_FORMAT, | |
1950 block_freelists()->total_size()); | |
1951 } | |
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1952 } |
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1953 |
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1954 SpaceManager::SpaceManager(Mutex* lock, |
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1955 VirtualSpaceList* vs_list) : |
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1956 _vs_list(vs_list), |
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1957 _allocation_total(0), |
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1958 _lock(lock) |
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1959 { |
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1960 initialize(); |
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1961 } |
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1962 |
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1963 void SpaceManager::initialize() { |
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1964 Metadebug::init_allocation_fail_alot_count(); |
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1965 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
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1966 _chunks_in_use[i] = NULL; |
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1967 } |
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1968 _current_chunk = NULL; |
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1969 if (TraceMetadataChunkAllocation && Verbose) { |
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1970 gclog_or_tty->print_cr("SpaceManager(): " PTR_FORMAT, this); |
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1971 } |
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1972 } |
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1973 |
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1974 SpaceManager::~SpaceManager() { |
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1975 MutexLockerEx fcl(SpaceManager::expand_lock(), |
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1976 Mutex::_no_safepoint_check_flag); |
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1977 |
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1978 ChunkManager* chunk_manager = vs_list()->chunk_manager(); |
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1979 |
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1980 chunk_manager->slow_locked_verify(); |
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1981 |
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1982 if (TraceMetadataChunkAllocation && Verbose) { |
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1983 gclog_or_tty->print_cr("~SpaceManager(): " PTR_FORMAT, this); |
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1984 locked_print_chunks_in_use_on(gclog_or_tty); |
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1985 } |
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1986 |
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1987 // Mangle freed memory. |
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1988 NOT_PRODUCT(mangle_freed_chunks();) |
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1989 |
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1990 // Have to update before the chunks_in_use lists are emptied |
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1991 // below. |
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1992 chunk_manager->inc_free_chunks_total(sum_capacity_in_chunks_in_use(), |
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1993 sum_count_in_chunks_in_use()); |
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1994 |
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1995 // Add all the chunks in use by this space manager |
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1996 // to the global list of free chunks. |
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1997 |
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1998 // Follow each list of chunks-in-use and add them to the |
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1999 // free lists. Each list is NULL terminated. |
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2000 |
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2001 for (ChunkIndex i = ZeroIndex; i < HumongousIndex; i = next_chunk_index(i)) { |
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2002 if (TraceMetadataChunkAllocation && Verbose) { |
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2003 gclog_or_tty->print_cr("returned %d %s chunks to freelist", |
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2004 sum_count_in_chunks_in_use(i), |
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2005 chunk_size_name(i)); |
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2006 } |
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2007 Metachunk* chunks = chunks_in_use(i); |
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2008 chunk_manager->free_chunks(i)->add_at_head(chunks); |
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2009 set_chunks_in_use(i, NULL); |
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2010 if (TraceMetadataChunkAllocation && Verbose) { |
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2011 gclog_or_tty->print_cr("updated freelist count %d %s", |
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2012 chunk_manager->free_chunks(i)->sum_list_count(), |
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2013 chunk_size_name(i)); |
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2014 } |
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2015 assert(i != HumongousIndex, "Humongous chunks are handled explicitly later"); |
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2016 } |
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2017 |
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2018 // The medium chunk case may be optimized by passing the head and |
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2019 // tail of the medium chunk list to add_at_head(). The tail is often |
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2020 // the current chunk but there are probably exceptions. |
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2021 |
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2022 // Humongous chunks |
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2023 if (TraceMetadataChunkAllocation && Verbose) { |
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2024 gclog_or_tty->print_cr("returned %d %s humongous chunks to dictionary", |
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2025 sum_count_in_chunks_in_use(HumongousIndex), |
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2026 chunk_size_name(HumongousIndex)); |
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2027 gclog_or_tty->print("Humongous chunk dictionary: "); |
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2028 } |
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2029 // Humongous chunks are never the current chunk. |
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2030 Metachunk* humongous_chunks = chunks_in_use(HumongousIndex); |
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2031 |
6885 | 2032 while (humongous_chunks != NULL) { |
2033 #ifdef ASSERT | |
2034 humongous_chunks->set_is_free(true); | |
2035 #endif | |
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2036 if (TraceMetadataChunkAllocation && Verbose) { |
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2037 gclog_or_tty->print(PTR_FORMAT " (" SIZE_FORMAT ") ", |
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2038 humongous_chunks, |
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2039 humongous_chunks->word_size()); |
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2040 } |
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2041 assert(humongous_chunks->word_size() == (size_t) |
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2042 align_size_up(humongous_chunks->word_size(), |
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2043 HumongousChunkGranularity), |
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2044 err_msg("Humongous chunk size is wrong: word size " SIZE_FORMAT |
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2045 " granularity %d", |
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2046 humongous_chunks->word_size(), HumongousChunkGranularity)); |
6885 | 2047 Metachunk* next_humongous_chunks = humongous_chunks->next(); |
2048 chunk_manager->humongous_dictionary()->return_chunk(humongous_chunks); | |
2049 humongous_chunks = next_humongous_chunks; | |
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2050 } |
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2051 if (TraceMetadataChunkAllocation && Verbose) { |
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2052 gclog_or_tty->print_cr(""); |
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2053 gclog_or_tty->print_cr("updated dictionary count %d %s", |
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2054 chunk_manager->humongous_dictionary()->total_count(), |
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2055 chunk_size_name(HumongousIndex)); |
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2056 } |
6885 | 2057 set_chunks_in_use(HumongousIndex, NULL); |
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2058 chunk_manager->slow_locked_verify(); |
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2059 } |
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2060 |
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2061 const char* SpaceManager::chunk_size_name(ChunkIndex index) const { |
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2062 switch (index) { |
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2063 case SpecializedIndex: |
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2064 return "Specialized"; |
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2065 case SmallIndex: |
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2066 return "Small"; |
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2067 case MediumIndex: |
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2068 return "Medium"; |
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2069 case HumongousIndex: |
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2070 return "Humongous"; |
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2071 default: |
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2072 return NULL; |
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2073 } |
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2074 } |
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2075 |
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2076 ChunkIndex ChunkManager::list_index(size_t size) { |
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2077 switch (size) { |
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2078 case SpecializedChunk: |
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2079 assert(SpecializedChunk == ClassSpecializedChunk, |
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2080 "Need branch for ClassSpecializedChunk"); |
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2081 return SpecializedIndex; |
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2082 case SmallChunk: |
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2083 case ClassSmallChunk: |
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2084 return SmallIndex; |
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2085 case MediumChunk: |
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2086 case ClassMediumChunk: |
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2087 return MediumIndex; |
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2088 default: |
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2089 assert(size > MediumChunk || size > ClassMediumChunk, |
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2090 "Not a humongous chunk"); |
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2091 return HumongousIndex; |
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2092 } |
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2093 } |
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2094 |
6885 | 2095 void SpaceManager::deallocate(MetaWord* p, size_t word_size) { |
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2096 assert_lock_strong(_lock); |
6885 | 2097 size_t min_size = TreeChunk<Metablock, FreeList>::min_size(); |
2098 assert(word_size >= min_size, | |
2099 err_msg("Should not deallocate dark matter " SIZE_FORMAT, word_size)); | |
2100 block_freelists()->return_block(p, word_size); | |
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2101 } |
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2102 |
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2103 // Adds a chunk to the list of chunks in use. |
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2104 void SpaceManager::add_chunk(Metachunk* new_chunk, bool make_current) { |
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2105 |
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2106 assert(new_chunk != NULL, "Should not be NULL"); |
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2107 assert(new_chunk->next() == NULL, "Should not be on a list"); |
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2108 |
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2109 new_chunk->reset_empty(); |
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2110 |
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2111 // Find the correct list and and set the current |
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2112 // chunk for that list. |
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2113 ChunkIndex index = ChunkManager::list_index(new_chunk->word_size()); |
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2114 |
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2115 if (index != HumongousIndex) { |
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2116 set_current_chunk(new_chunk); |
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2117 new_chunk->set_next(chunks_in_use(index)); |
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2118 set_chunks_in_use(index, new_chunk); |
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2119 } else { |
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2120 // For null class loader data and DumpSharedSpaces, the first chunk isn't |
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2121 // small, so small will be null. Link this first chunk as the current |
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2122 // chunk. |
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2123 if (make_current) { |
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2124 // Set as the current chunk but otherwise treat as a humongous chunk. |
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2125 set_current_chunk(new_chunk); |
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2126 } |
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2127 // Link at head. The _current_chunk only points to a humongous chunk for |
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2128 // the null class loader metaspace (class and data virtual space managers) |
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2129 // any humongous chunks so will not point to the tail |
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2130 // of the humongous chunks list. |
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2131 new_chunk->set_next(chunks_in_use(HumongousIndex)); |
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2132 set_chunks_in_use(HumongousIndex, new_chunk); |
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2133 |
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2134 assert(new_chunk->word_size() > medium_chunk_size(), "List inconsistency"); |
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2135 } |
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2136 |
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2137 assert(new_chunk->is_empty(), "Not ready for reuse"); |
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2138 if (TraceMetadataChunkAllocation && Verbose) { |
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2139 gclog_or_tty->print("SpaceManager::add_chunk: %d) ", |
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2140 sum_count_in_chunks_in_use()); |
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2141 new_chunk->print_on(gclog_or_tty); |
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2142 vs_list()->chunk_manager()->locked_print_free_chunks(tty); |
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2143 } |
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2144 } |
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2145 |
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2146 Metachunk* SpaceManager::get_new_chunk(size_t word_size, |
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2147 size_t grow_chunks_by_words) { |
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2148 |
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2149 Metachunk* next = vs_list()->get_new_chunk(word_size, |
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2150 grow_chunks_by_words, |
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2151 medium_chunk_bunch()); |
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2152 |
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2153 if (TraceMetadataHumongousAllocation && |
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2154 SpaceManager::is_humongous(next->word_size())) { |
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2155 gclog_or_tty->print_cr(" new humongous chunk word size " PTR_FORMAT, |
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2156 next->word_size()); |
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2157 } |
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2158 |
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2159 return next; |
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2160 } |
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2161 |
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2162 MetaWord* SpaceManager::allocate(size_t word_size) { |
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2163 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
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2164 |
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2165 // If only the dictionary is going to be used (i.e., no |
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2166 // indexed free list), then there is a minimum size requirement. |
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2167 // MinChunkSize is a placeholder for the real minimum size JJJ |
6885 | 2168 size_t byte_size = word_size * BytesPerWord; |
2169 | |
2170 size_t byte_size_with_overhead = byte_size + Metablock::overhead(); | |
2171 | |
2172 size_t raw_bytes_size = MAX2(byte_size_with_overhead, | |
2173 Metablock::min_block_byte_size()); | |
2174 raw_bytes_size = ARENA_ALIGN(raw_bytes_size); | |
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2175 size_t raw_word_size = raw_bytes_size / BytesPerWord; |
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2176 assert(raw_word_size * BytesPerWord == raw_bytes_size, "Size problem"); |
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2177 |
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2178 BlockFreelist* fl = block_freelists(); |
6885 | 2179 MetaWord* p = NULL; |
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2180 // Allocation from the dictionary is expensive in the sense that |
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2181 // the dictionary has to be searched for a size. Don't allocate |
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2182 // from the dictionary until it starts to get fat. Is this |
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2183 // a reasonable policy? Maybe an skinny dictionary is fast enough |
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2184 // for allocations. Do some profiling. JJJ |
6885 | 2185 if (fl->total_size() > allocation_from_dictionary_limit) { |
2186 p = fl->get_block(raw_word_size); | |
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2187 } |
6885 | 2188 if (p == NULL) { |
2189 p = allocate_work(raw_word_size); | |
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2190 } |
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2191 Metadebug::deallocate_block_a_lot(this, raw_word_size); |
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2192 |
6885 | 2193 return p; |
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2194 } |
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2195 |
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2196 // Returns the address of spaced allocated for "word_size". |
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2197 // This methods does not know about blocks (Metablocks) |
6885 | 2198 MetaWord* SpaceManager::allocate_work(size_t word_size) { |
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2199 assert_lock_strong(_lock); |
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2200 #ifdef ASSERT |
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2201 if (Metadebug::test_metadata_failure()) { |
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2202 return NULL; |
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2203 } |
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2204 #endif |
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2205 // Is there space in the current chunk? |
6885 | 2206 MetaWord* result = NULL; |
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2207 |
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2208 // For DumpSharedSpaces, only allocate out of the current chunk which is |
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2209 // never null because we gave it the size we wanted. Caller reports out |
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2210 // of memory if this returns null. |
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2211 if (DumpSharedSpaces) { |
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2212 assert(current_chunk() != NULL, "should never happen"); |
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2213 inc_allocation_total(word_size); |
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2214 return current_chunk()->allocate(word_size); // caller handles null result |
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2215 } |
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2216 if (current_chunk() != NULL) { |
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2217 result = current_chunk()->allocate(word_size); |
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2218 } |
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2219 |
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2220 if (result == NULL) { |
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2221 result = grow_and_allocate(word_size); |
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2222 } |
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2223 if (result > 0) { |
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2224 inc_allocation_total(word_size); |
6885 | 2225 assert(result != (MetaWord*) chunks_in_use(MediumIndex), |
2226 "Head of the list is being allocated"); | |
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2227 } |
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2228 |
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2229 return result; |
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2230 } |
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2231 |
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2232 void SpaceManager::verify() { |
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2233 // If there are blocks in the dictionary, then |
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2234 // verfication of chunks does not work since |
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2235 // being in the dictionary alters a chunk. |
6885 | 2236 if (block_freelists()->total_size() == 0) { |
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2237 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
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2238 Metachunk* curr = chunks_in_use(i); |
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2239 while (curr != NULL) { |
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2240 curr->verify(); |
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2241 verify_chunk_size(curr); |
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2242 curr = curr->next(); |
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2243 } |
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2244 } |
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2245 } |
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2246 } |
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2247 |
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2248 void SpaceManager::verify_chunk_size(Metachunk* chunk) { |
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2249 assert(is_humongous(chunk->word_size()) || |
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2250 chunk->word_size() == medium_chunk_size() || |
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2251 chunk->word_size() == small_chunk_size() || |
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2252 chunk->word_size() == specialized_chunk_size(), |
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2253 "Chunk size is wrong"); |
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2254 return; |
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2255 } |
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2256 |
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2257 #ifdef ASSERT |
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2258 void SpaceManager::verify_allocation_total() { |
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2259 // Verification is only guaranteed at a safepoint. |
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2260 if (SafepointSynchronize::is_at_safepoint()) { |
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2261 gclog_or_tty->print_cr("Chunk " PTR_FORMAT " allocation_total " SIZE_FORMAT |
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2262 " sum_used_in_chunks_in_use " SIZE_FORMAT, |
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2263 this, |
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2264 allocation_total(), |
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2265 sum_used_in_chunks_in_use()); |
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2266 } |
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2267 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
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2268 assert(allocation_total() == sum_used_in_chunks_in_use(), |
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2269 err_msg("allocation total is not consistent " SIZE_FORMAT |
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2270 " vs " SIZE_FORMAT, |
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2271 allocation_total(), sum_used_in_chunks_in_use())); |
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2272 } |
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|
2273 |
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2274 #endif |
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2275 |
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2276 void SpaceManager::dump(outputStream* const out) const { |
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2277 size_t curr_total = 0; |
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2278 size_t waste = 0; |
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2279 uint i = 0; |
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2280 size_t used = 0; |
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2281 size_t capacity = 0; |
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|
2282 |
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2283 // Add up statistics for all chunks in this SpaceManager. |
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2284 for (ChunkIndex index = ZeroIndex; |
6885 | 2285 index < NumberOfInUseLists; |
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2286 index = next_chunk_index(index)) { |
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2287 for (Metachunk* curr = chunks_in_use(index); |
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2288 curr != NULL; |
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2289 curr = curr->next()) { |
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2290 out->print("%d) ", i++); |
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2291 curr->print_on(out); |
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2292 if (TraceMetadataChunkAllocation && Verbose) { |
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2293 block_freelists()->print_on(out); |
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2294 } |
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2295 curr_total += curr->word_size(); |
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2296 used += curr->used_word_size(); |
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2297 capacity += curr->capacity_word_size(); |
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2298 waste += curr->free_word_size() + curr->overhead();; |
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2299 } |
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2300 } |
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2301 |
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2302 size_t free = current_chunk() == NULL ? 0 : current_chunk()->free_word_size(); |
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2303 // Free space isn't wasted. |
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2304 waste -= free; |
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2305 |
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2306 out->print_cr("total of all chunks " SIZE_FORMAT " used " SIZE_FORMAT |
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2307 " free " SIZE_FORMAT " capacity " SIZE_FORMAT |
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2308 " waste " SIZE_FORMAT, curr_total, used, free, capacity, waste); |
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2309 } |
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2310 |
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2311 #ifndef PRODUCT |
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2312 void SpaceManager::mangle_freed_chunks() { |
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2313 for (ChunkIndex index = ZeroIndex; |
6885 | 2314 index < NumberOfInUseLists; |
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2315 index = next_chunk_index(index)) { |
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2316 for (Metachunk* curr = chunks_in_use(index); |
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2317 curr != NULL; |
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2318 curr = curr->next()) { |
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2319 curr->mangle(); |
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2320 } |
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2321 } |
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2322 } |
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2323 #endif // PRODUCT |
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2324 |
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2325 // MetaspaceAux |
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2326 |
6734 | 2327 size_t MetaspaceAux::used_in_bytes(Metaspace::MetadataType mdtype) { |
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2328 size_t used = 0; |
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2329 ClassLoaderDataGraphMetaspaceIterator iter; |
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2330 while (iter.repeat()) { |
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2331 Metaspace* msp = iter.get_next(); |
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2332 // Sum allocation_total for each metaspace |
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2333 if (msp != NULL) { |
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2334 used += msp->used_words(mdtype); |
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2335 } |
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2336 } |
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2337 return used * BytesPerWord; |
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2338 } |
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2339 |
6725
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2340 size_t MetaspaceAux::free_in_bytes(Metaspace::MetadataType mdtype) { |
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2341 size_t free = 0; |
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2342 ClassLoaderDataGraphMetaspaceIterator iter; |
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2343 while (iter.repeat()) { |
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2344 Metaspace* msp = iter.get_next(); |
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2345 if (msp != NULL) { |
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2346 free += msp->free_words(mdtype); |
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2347 } |
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2348 } |
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2349 return free * BytesPerWord; |
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2350 } |
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2351 |
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2352 size_t MetaspaceAux::capacity_in_bytes(Metaspace::MetadataType mdtype) { |
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2353 size_t capacity = free_chunks_total(mdtype); |
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2354 ClassLoaderDataGraphMetaspaceIterator iter; |
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2355 while (iter.repeat()) { |
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2356 Metaspace* msp = iter.get_next(); |
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2357 if (msp != NULL) { |
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2358 capacity += msp->capacity_words(mdtype); |
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2359 } |
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2360 } |
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2361 return capacity * BytesPerWord; |
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2362 } |
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2363 |
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2364 size_t MetaspaceAux::reserved_in_bytes(Metaspace::MetadataType mdtype) { |
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2365 size_t reserved = (mdtype == Metaspace::ClassType) ? |
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2366 Metaspace::class_space_list()->virtual_space_total() : |
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2367 Metaspace::space_list()->virtual_space_total(); |
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2368 return reserved * BytesPerWord; |
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2369 } |
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2370 |
7446
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2371 size_t MetaspaceAux::min_chunk_size() { return Metaspace::first_chunk_word_size(); } |
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2372 |
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2373 size_t MetaspaceAux::free_chunks_total(Metaspace::MetadataType mdtype) { |
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2374 ChunkManager* chunk = (mdtype == Metaspace::ClassType) ? |
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2375 Metaspace::class_space_list()->chunk_manager() : |
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2376 Metaspace::space_list()->chunk_manager(); |
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2377 chunk->slow_verify(); |
6725
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2378 return chunk->free_chunks_total(); |
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2379 } |
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2380 |
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2381 size_t MetaspaceAux::free_chunks_total_in_bytes(Metaspace::MetadataType mdtype) { |
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2382 return free_chunks_total(mdtype) * BytesPerWord; |
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2383 } |
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2384 |
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2385 void MetaspaceAux::print_metaspace_change(size_t prev_metadata_used) { |
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2386 gclog_or_tty->print(", [Metaspace:"); |
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2387 if (PrintGCDetails && Verbose) { |
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2388 gclog_or_tty->print(" " SIZE_FORMAT |
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2389 "->" SIZE_FORMAT |
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2390 "(" SIZE_FORMAT "/" SIZE_FORMAT ")", |
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2391 prev_metadata_used, |
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2392 used_in_bytes(), |
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2393 capacity_in_bytes(), |
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2394 reserved_in_bytes()); |
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2395 } else { |
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2396 gclog_or_tty->print(" " SIZE_FORMAT "K" |
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2397 "->" SIZE_FORMAT "K" |
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2398 "(" SIZE_FORMAT "K/" SIZE_FORMAT "K)", |
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2399 prev_metadata_used / K, |
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2400 used_in_bytes()/ K, |
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2401 capacity_in_bytes()/K, |
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2402 reserved_in_bytes()/ K); |
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2403 } |
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2404 |
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2405 gclog_or_tty->print("]"); |
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2406 } |
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2407 |
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2408 // This is printed when PrintGCDetails |
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2409 void MetaspaceAux::print_on(outputStream* out) { |
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2410 Metaspace::MetadataType ct = Metaspace::ClassType; |
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2411 Metaspace::MetadataType nct = Metaspace::NonClassType; |
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2412 |
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2413 out->print_cr(" Metaspace total " |
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2414 SIZE_FORMAT "K, used " SIZE_FORMAT "K," |
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2415 " reserved " SIZE_FORMAT "K", |
6734 | 2416 capacity_in_bytes()/K, used_in_bytes()/K, reserved_in_bytes()/K); |
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2417 out->print_cr(" data space " |
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2418 SIZE_FORMAT "K, used " SIZE_FORMAT "K," |
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2419 " reserved " SIZE_FORMAT "K", |
6734 | 2420 capacity_in_bytes(nct)/K, used_in_bytes(nct)/K, reserved_in_bytes(nct)/K); |
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2421 out->print_cr(" class space " |
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2422 SIZE_FORMAT "K, used " SIZE_FORMAT "K," |
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2423 " reserved " SIZE_FORMAT "K", |
6734 | 2424 capacity_in_bytes(ct)/K, used_in_bytes(ct)/K, reserved_in_bytes(ct)/K); |
6725
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2425 } |
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2426 |
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2427 // Print information for class space and data space separately. |
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2428 // This is almost the same as above. |
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2429 void MetaspaceAux::print_on(outputStream* out, Metaspace::MetadataType mdtype) { |
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2430 size_t free_chunks_capacity_bytes = free_chunks_total_in_bytes(mdtype); |
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2431 size_t capacity_bytes = capacity_in_bytes(mdtype); |
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2432 size_t used_bytes = used_in_bytes(mdtype); |
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2433 size_t free_bytes = free_in_bytes(mdtype); |
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2434 size_t used_and_free = used_bytes + free_bytes + |
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2435 free_chunks_capacity_bytes; |
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2436 out->print_cr(" Chunk accounting: used in chunks " SIZE_FORMAT |
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2437 "K + unused in chunks " SIZE_FORMAT "K + " |
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2438 " capacity in free chunks " SIZE_FORMAT "K = " SIZE_FORMAT |
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2439 "K capacity in allocated chunks " SIZE_FORMAT "K", |
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2440 used_bytes / K, |
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2441 free_bytes / K, |
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2442 free_chunks_capacity_bytes / K, |
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2443 used_and_free / K, |
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2444 capacity_bytes / K); |
8738
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2445 // Accounting can only be correct if we got the values during a safepoint |
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2446 assert(!SafepointSynchronize::is_at_safepoint() || used_and_free == capacity_bytes, "Accounting is wrong"); |
6725
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2447 } |
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2448 |
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2449 // Print total fragmentation for class and data metaspaces separately |
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2450 void MetaspaceAux::print_waste(outputStream* out) { |
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2451 |
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2452 size_t specialized_waste = 0, small_waste = 0, medium_waste = 0, large_waste = 0; |
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2453 size_t specialized_count = 0, small_count = 0, medium_count = 0, large_count = 0; |
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2454 size_t cls_specialized_waste = 0, cls_small_waste = 0, cls_medium_waste = 0, cls_large_waste = 0; |
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2455 size_t cls_specialized_count = 0, cls_small_count = 0, cls_medium_count = 0, cls_large_count = 0; |
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|
2456 |
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2457 ClassLoaderDataGraphMetaspaceIterator iter; |
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2458 while (iter.repeat()) { |
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2459 Metaspace* msp = iter.get_next(); |
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2460 if (msp != NULL) { |
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2461 specialized_waste += msp->vsm()->sum_waste_in_chunks_in_use(SpecializedIndex); |
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2462 specialized_count += msp->vsm()->sum_count_in_chunks_in_use(SpecializedIndex); |
6725
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2463 small_waste += msp->vsm()->sum_waste_in_chunks_in_use(SmallIndex); |
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2464 small_count += msp->vsm()->sum_count_in_chunks_in_use(SmallIndex); |
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2465 medium_waste += msp->vsm()->sum_waste_in_chunks_in_use(MediumIndex); |
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2466 medium_count += msp->vsm()->sum_count_in_chunks_in_use(MediumIndex); |
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2467 large_waste += msp->vsm()->sum_waste_in_chunks_in_use(HumongousIndex); |
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2468 large_count += msp->vsm()->sum_count_in_chunks_in_use(HumongousIndex); |
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|
2469 |
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2470 cls_specialized_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SpecializedIndex); |
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2471 cls_specialized_count += msp->class_vsm()->sum_count_in_chunks_in_use(SpecializedIndex); |
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2472 cls_small_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SmallIndex); |
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2473 cls_small_count += msp->class_vsm()->sum_count_in_chunks_in_use(SmallIndex); |
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2474 cls_medium_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(MediumIndex); |
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2475 cls_medium_count += msp->class_vsm()->sum_count_in_chunks_in_use(MediumIndex); |
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2476 cls_large_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(HumongousIndex); |
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2477 cls_large_count += msp->class_vsm()->sum_count_in_chunks_in_use(HumongousIndex); |
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|
2478 } |
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|
2479 } |
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2480 out->print_cr("Total fragmentation waste (words) doesn't count free space"); |
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2481 out->print_cr(" data: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", " |
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2482 SIZE_FORMAT " small(s) " SIZE_FORMAT ", " |
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|
2483 SIZE_FORMAT " medium(s) " SIZE_FORMAT, |
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2484 specialized_count, specialized_waste, small_count, |
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2485 small_waste, medium_count, medium_waste); |
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2486 out->print_cr(" class: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", " |
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2487 SIZE_FORMAT " small(s) " SIZE_FORMAT, |
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2488 cls_specialized_count, cls_specialized_waste, |
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|
2489 cls_small_count, cls_small_waste); |
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|
2490 } |
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|
2491 |
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2492 // Dump global metaspace things from the end of ClassLoaderDataGraph |
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|
2493 void MetaspaceAux::dump(outputStream* out) { |
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|
2494 out->print_cr("All Metaspace:"); |
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|
2495 out->print("data space: "); print_on(out, Metaspace::NonClassType); |
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2496 out->print("class space: "); print_on(out, Metaspace::ClassType); |
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|
2497 print_waste(out); |
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|
2498 } |
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|
2499 |
6969
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|
2500 void MetaspaceAux::verify_free_chunks() { |
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|
2501 Metaspace::space_list()->chunk_manager()->verify(); |
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|
2502 Metaspace::class_space_list()->chunk_manager()->verify(); |
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|
2503 } |
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|
2504 |
6725
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|
2505 // Metaspace methods |
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|
2506 |
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2507 size_t Metaspace::_first_chunk_word_size = 0; |
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2508 size_t Metaspace::_first_class_chunk_word_size = 0; |
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|
2509 |
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|
2510 Metaspace::Metaspace(Mutex* lock, MetaspaceType type) { |
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|
2511 initialize(lock, type); |
6725
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|
2512 } |
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|
2513 |
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|
2514 Metaspace::~Metaspace() { |
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|
2515 delete _vsm; |
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diff
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|
2516 delete _class_vsm; |
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diff
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|
2517 } |
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|
2518 |
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|
2519 VirtualSpaceList* Metaspace::_space_list = NULL; |
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|
2520 VirtualSpaceList* Metaspace::_class_space_list = NULL; |
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|
2521 |
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|
2522 #define VIRTUALSPACEMULTIPLIER 2 |
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|
2523 |
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|
2524 void Metaspace::global_initialize() { |
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diff
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|
2525 // Initialize the alignment for shared spaces. |
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|
2526 int max_alignment = os::vm_page_size(); |
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|
2527 MetaspaceShared::set_max_alignment(max_alignment); |
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diff
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|
2528 |
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diff
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|
2529 if (DumpSharedSpaces) { |
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|
2530 SharedReadOnlySize = align_size_up(SharedReadOnlySize, max_alignment); |
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|
2531 SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment); |
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|
2532 SharedMiscDataSize = align_size_up(SharedMiscDataSize, max_alignment); |
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|
2533 SharedMiscCodeSize = align_size_up(SharedMiscCodeSize, max_alignment); |
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|
2534 |
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|
2535 // Initialize with the sum of the shared space sizes. The read-only |
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diff
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|
2536 // and read write metaspace chunks will be allocated out of this and the |
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diff
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|
2537 // remainder is the misc code and data chunks. |
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|
2538 size_t total = align_size_up(SharedReadOnlySize + SharedReadWriteSize + |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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diff
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|
2539 SharedMiscDataSize + SharedMiscCodeSize, |
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diff
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|
2540 os::vm_allocation_granularity()); |
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diff
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|
2541 size_t word_size = total/wordSize; |
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|
2542 _space_list = new VirtualSpaceList(word_size); |
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diff
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|
2543 } else { |
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|
2544 // If using shared space, open the file that contains the shared space |
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diff
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|
2545 // and map in the memory before initializing the rest of metaspace (so |
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diff
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|
2546 // the addresses don't conflict) |
da91efe96a93
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diff
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|
2547 if (UseSharedSpaces) { |
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diff
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|
2548 FileMapInfo* mapinfo = new FileMapInfo(); |
da91efe96a93
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|
2549 memset(mapinfo, 0, sizeof(FileMapInfo)); |
da91efe96a93
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diff
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|
2550 |
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|
2551 // Open the shared archive file, read and validate the header. If |
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diff
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|
2552 // initialization fails, shared spaces [UseSharedSpaces] are |
da91efe96a93
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diff
changeset
|
2553 // disabled and the file is closed. |
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diff
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|
2554 // Map in spaces now also |
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diff
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|
2555 if (mapinfo->initialize() && MetaspaceShared::map_shared_spaces(mapinfo)) { |
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diff
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|
2556 FileMapInfo::set_current_info(mapinfo); |
da91efe96a93
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diff
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|
2557 } else { |
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diff
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|
2558 assert(!mapinfo->is_open() && !UseSharedSpaces, |
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parents:
diff
changeset
|
2559 "archive file not closed or shared spaces not disabled."); |
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diff
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|
2560 } |
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diff
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|
2561 } |
da91efe96a93
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diff
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|
2562 |
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|
2563 // Initialize these before initializing the VirtualSpaceList |
6725
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diff
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|
2564 _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord; |
7446
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|
2565 _first_chunk_word_size = align_word_size_up(_first_chunk_word_size); |
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|
2566 // Make the first class chunk bigger than a medium chunk so it's not put |
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|
2567 // on the medium chunk list. The next chunk will be small and progress |
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|
2568 // from there. This size calculated by -version. |
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|
2569 _first_class_chunk_word_size = MIN2((size_t)MediumChunk*6, |
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diff
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|
2570 (ClassMetaspaceSize/BytesPerWord)*2); |
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|
2571 _first_class_chunk_word_size = align_word_size_up(_first_class_chunk_word_size); |
6725
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2572 // Arbitrarily set the initial virtual space to a multiple |
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2573 // of the boot class loader size. |
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2574 size_t word_size = VIRTUALSPACEMULTIPLIER * first_chunk_word_size(); |
6725
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2575 // Initialize the list of virtual spaces. |
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2576 _space_list = new VirtualSpaceList(word_size); |
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2577 } |
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|
2578 } |
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|
2579 |
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2580 // For UseCompressedKlassPointers the class space is reserved as a piece of the |
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2581 // Java heap because the compression algorithm is the same for each. The |
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2582 // argument passed in is at the top of the compressed space |
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2583 void Metaspace::initialize_class_space(ReservedSpace rs) { |
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2584 // The reserved space size may be bigger because of alignment, esp with UseLargePages |
8007
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mikael
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2585 assert(rs.size() >= ClassMetaspaceSize, |
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2586 err_msg(SIZE_FORMAT " != " UINTX_FORMAT, rs.size(), ClassMetaspaceSize)); |
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2587 _class_space_list = new VirtualSpaceList(rs); |
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2588 } |
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2589 |
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2590 void Metaspace::initialize(Mutex* lock, |
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2591 MetaspaceType type) { |
6725
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|
2592 |
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2593 assert(space_list() != NULL, |
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2594 "Metadata VirtualSpaceList has not been initialized"); |
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2595 |
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2596 _vsm = new SpaceManager(lock, space_list()); |
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2597 if (_vsm == NULL) { |
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2598 return; |
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2599 } |
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2600 size_t word_size; |
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2601 size_t class_word_size; |
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2602 vsm()->get_initial_chunk_sizes(type, |
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2603 &word_size, |
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2604 &class_word_size); |
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2605 |
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2606 assert(class_space_list() != NULL, |
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2607 "Class VirtualSpaceList has not been initialized"); |
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2608 |
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2609 // Allocate SpaceManager for classes. |
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2610 _class_vsm = new SpaceManager(lock, class_space_list()); |
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2611 if (_class_vsm == NULL) { |
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2612 return; |
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|
2613 } |
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2614 |
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2615 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag); |
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2616 |
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2617 // Allocate chunk for metadata objects |
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2618 Metachunk* new_chunk = |
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2619 space_list()->get_initialization_chunk(word_size, |
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2620 vsm()->medium_chunk_bunch()); |
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2621 assert(!DumpSharedSpaces || new_chunk != NULL, "should have enough space for both chunks"); |
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2622 if (new_chunk != NULL) { |
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2623 // Add to this manager's list of chunks in use and current_chunk(). |
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2624 vsm()->add_chunk(new_chunk, true); |
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2625 } |
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2626 |
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2627 // Allocate chunk for class metadata objects |
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2628 Metachunk* class_chunk = |
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2629 class_space_list()->get_initialization_chunk(class_word_size, |
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2630 class_vsm()->medium_chunk_bunch()); |
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2631 if (class_chunk != NULL) { |
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2632 class_vsm()->add_chunk(class_chunk, true); |
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2633 } |
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2634 } |
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2635 |
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2636 size_t Metaspace::align_word_size_up(size_t word_size) { |
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2637 size_t byte_size = word_size * wordSize; |
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2638 return ReservedSpace::allocation_align_size_up(byte_size) / wordSize; |
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2639 } |
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|
2640 |
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2641 MetaWord* Metaspace::allocate(size_t word_size, MetadataType mdtype) { |
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2642 // DumpSharedSpaces doesn't use class metadata area (yet) |
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2643 if (mdtype == ClassType && !DumpSharedSpaces) { |
6885 | 2644 return class_vsm()->allocate(word_size); |
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2645 } else { |
6885 | 2646 return vsm()->allocate(word_size); |
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2647 } |
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2648 } |
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2649 |
6753
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2650 MetaWord* Metaspace::expand_and_allocate(size_t word_size, MetadataType mdtype) { |
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2651 MetaWord* result; |
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|
2652 MetaspaceGC::set_expand_after_GC(true); |
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|
2653 size_t before_inc = MetaspaceGC::capacity_until_GC(); |
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|
2654 size_t delta_words = MetaspaceGC::delta_capacity_until_GC(word_size); |
8da5e203b993
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|
2655 MetaspaceGC::inc_capacity_until_GC(delta_words); |
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2656 if (PrintGCDetails && Verbose) { |
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|
2657 gclog_or_tty->print_cr("Increase capacity to GC from " SIZE_FORMAT |
8da5e203b993
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|
2658 " to " SIZE_FORMAT, before_inc, MetaspaceGC::capacity_until_GC()); |
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|
2659 } |
6885 | 2660 |
6753
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|
2661 result = allocate(word_size, mdtype); |
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|
2662 |
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|
2663 return result; |
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|
2664 } |
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|
2665 |
6725
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2666 // Space allocated in the Metaspace. This may |
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2667 // be across several metadata virtual spaces. |
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2668 char* Metaspace::bottom() const { |
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2669 assert(DumpSharedSpaces, "only useful and valid for dumping shared spaces"); |
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2670 return (char*)vsm()->current_chunk()->bottom(); |
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|
2671 } |
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2672 |
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2673 size_t Metaspace::used_words(MetadataType mdtype) const { |
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2674 // return vsm()->allocation_total(); |
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2675 return mdtype == ClassType ? class_vsm()->sum_used_in_chunks_in_use() : |
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2676 vsm()->sum_used_in_chunks_in_use(); // includes overhead! |
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2677 } |
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2678 |
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2679 size_t Metaspace::free_words(MetadataType mdtype) const { |
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2680 return mdtype == ClassType ? class_vsm()->sum_free_in_chunks_in_use() : |
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2681 vsm()->sum_free_in_chunks_in_use(); |
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2682 } |
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|
2683 |
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2684 // Space capacity in the Metaspace. It includes |
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2685 // space in the list of chunks from which allocations |
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2686 // have been made. Don't include space in the global freelist and |
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|
2687 // in the space available in the dictionary which |
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2688 // is already counted in some chunk. |
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|
2689 size_t Metaspace::capacity_words(MetadataType mdtype) const { |
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2690 return mdtype == ClassType ? class_vsm()->sum_capacity_in_chunks_in_use() : |
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|
2691 vsm()->sum_capacity_in_chunks_in_use(); |
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|
2692 } |
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|
2693 |
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2694 void Metaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) { |
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2695 if (SafepointSynchronize::is_at_safepoint()) { |
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2696 assert(Thread::current()->is_VM_thread(), "should be the VM thread"); |
6885 | 2697 // Don't take Heap_lock |
2698 MutexLocker ml(vsm()->lock()); | |
2699 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) { | |
2700 // Dark matter. Too small for dictionary. | |
2701 #ifdef ASSERT | |
2702 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5); | |
2703 #endif | |
2704 return; | |
6725
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2705 } |
6885 | 2706 if (is_class) { |
2707 class_vsm()->deallocate(ptr, word_size); | |
2708 } else { | |
2709 vsm()->deallocate(ptr, word_size); | |
2710 } | |
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2711 } else { |
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2712 MutexLocker ml(vsm()->lock()); |
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2713 |
6885 | 2714 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) { |
2715 // Dark matter. Too small for dictionary. | |
2716 #ifdef ASSERT | |
2717 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5); | |
2718 #endif | |
2719 return; | |
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2720 } |
6885 | 2721 if (is_class) { |
2722 class_vsm()->deallocate(ptr, word_size); | |
2723 } else { | |
2724 vsm()->deallocate(ptr, word_size); | |
2725 } | |
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2726 } |
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2727 } |
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2728 |
6885 | 2729 Metablock* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size, |
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2730 bool read_only, MetadataType mdtype, TRAPS) { |
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2731 if (HAS_PENDING_EXCEPTION) { |
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2732 assert(false, "Should not allocate with exception pending"); |
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2733 return NULL; // caller does a CHECK_NULL too |
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2734 } |
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2735 |
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2736 // SSS: Should we align the allocations and make sure the sizes are aligned. |
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2737 MetaWord* result = NULL; |
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2738 |
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2739 assert(loader_data != NULL, "Should never pass around a NULL loader_data. " |
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2740 "ClassLoaderData::the_null_class_loader_data() should have been used."); |
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2741 // Allocate in metaspaces without taking out a lock, because it deadlocks |
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2742 // with the SymbolTable_lock. Dumping is single threaded for now. We'll have |
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2743 // to revisit this for application class data sharing. |
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2744 if (DumpSharedSpaces) { |
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2745 if (read_only) { |
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2746 result = loader_data->ro_metaspace()->allocate(word_size, NonClassType); |
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2747 } else { |
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2748 result = loader_data->rw_metaspace()->allocate(word_size, NonClassType); |
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2749 } |
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2750 if (result == NULL) { |
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2751 report_out_of_shared_space(read_only ? SharedReadOnly : SharedReadWrite); |
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2752 } |
6885 | 2753 return Metablock::initialize(result, word_size); |
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2754 } |
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2755 |
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2756 result = loader_data->metaspace_non_null()->allocate(word_size, mdtype); |
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2757 |
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2758 if (result == NULL) { |
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2759 // Try to clean out some memory and retry. |
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2760 result = |
6885 | 2761 Universe::heap()->collector_policy()->satisfy_failed_metadata_allocation( |
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2762 loader_data, word_size, mdtype); |
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2763 |
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2764 // If result is still null, we are out of memory. |
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2765 if (result == NULL) { |
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2766 if (Verbose && TraceMetadataChunkAllocation) { |
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2767 gclog_or_tty->print_cr("Metaspace allocation failed for size " |
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2768 SIZE_FORMAT, word_size); |
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2769 if (loader_data->metaspace_or_null() != NULL) loader_data->metaspace_or_null()->dump(gclog_or_tty); |
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2770 MetaspaceAux::dump(gclog_or_tty); |
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2771 } |
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2772 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support |
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2773 report_java_out_of_memory("Metadata space"); |
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2774 |
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2775 if (JvmtiExport::should_post_resource_exhausted()) { |
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2776 JvmtiExport::post_resource_exhausted( |
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2777 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR, |
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2778 "Metadata space"); |
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2779 } |
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2780 THROW_OOP_0(Universe::out_of_memory_error_perm_gen()); |
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2781 } |
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2782 } |
6885 | 2783 return Metablock::initialize(result, word_size); |
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2784 } |
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2785 |
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2786 void Metaspace::print_on(outputStream* out) const { |
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2787 // Print both class virtual space counts and metaspace. |
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2788 if (Verbose) { |
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2789 vsm()->print_on(out); |
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2790 class_vsm()->print_on(out); |
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2791 } |
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2792 } |
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2793 |
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2794 bool Metaspace::contains(const void * ptr) { |
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2795 if (MetaspaceShared::is_in_shared_space(ptr)) { |
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2796 return true; |
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2797 } |
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2798 // This is checked while unlocked. As long as the virtualspaces are added |
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2799 // at the end, the pointer will be in one of them. The virtual spaces |
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2800 // aren't deleted presently. When they are, some sort of locking might |
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2801 // be needed. Note, locking this can cause inversion problems with the |
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2802 // caller in MetaspaceObj::is_metadata() function. |
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2803 return space_list()->contains(ptr) || class_space_list()->contains(ptr); |
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2804 } |
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2805 |
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2806 void Metaspace::verify() { |
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2807 vsm()->verify(); |
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2808 class_vsm()->verify(); |
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2809 } |
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2810 |
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2811 void Metaspace::dump(outputStream* const out) const { |
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2812 if (UseMallocOnly) { |
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2813 // Just print usage for now |
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2814 out->print_cr("usage %d", used_words(Metaspace::NonClassType)); |
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2815 } |
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2816 out->print_cr("\nVirtual space manager: " INTPTR_FORMAT, vsm()); |
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2817 vsm()->dump(out); |
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2818 out->print_cr("\nClass space manager: " INTPTR_FORMAT, class_vsm()); |
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2819 class_vsm()->dump(out); |
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2820 } |