Mercurial > hg > truffle
annotate src/share/vm/memory/metaspace.cpp @ 8786:19f9fabd94cc
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author | stefank |
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date | Mon, 18 Mar 2013 09:34:58 +0100 |
parents | 15401203db6b 79af1312fc2c |
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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) { |
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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 // This allocates memory with mmap. For DumpSharedspaces, allocate the |
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338 // space at low memory so that other shared images don't conflict. |
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339 // This is the same address as memory needed for UseCompressedOops but |
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340 // compressed oops don't work with CDS (offsets in metadata are wrong), so |
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341 // borrow the same address. |
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342 if (DumpSharedSpaces) { |
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343 char* shared_base = (char*)HeapBaseMinAddress; |
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344 _rs = ReservedSpace(byte_size, 0, false, shared_base, 0); |
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345 if (_rs.is_reserved()) { |
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346 assert(_rs.base() == shared_base, "should match"); |
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347 } else { |
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348 // If we are dumping the heap, then allocate a wasted block of address |
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349 // space in order to push the heap to a lower address. This extra |
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350 // address range allows for other (or larger) libraries to be loaded |
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351 // without them occupying the space required for the shared spaces. |
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352 uintx reserved = 0; |
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353 uintx block_size = 64*1024*1024; |
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354 while (reserved < SharedDummyBlockSize) { |
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355 char* dummy = os::reserve_memory(block_size); |
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356 reserved += block_size; |
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357 } |
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358 _rs = ReservedSpace(byte_size); |
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359 } |
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360 MetaspaceShared::set_shared_rs(&_rs); |
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361 } else { |
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362 _rs = ReservedSpace(byte_size); |
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363 } |
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364 |
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365 MemTracker::record_virtual_memory_type((address)_rs.base(), mtClass); |
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366 } |
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367 |
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368 // List of VirtualSpaces for metadata allocation. |
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369 // It has a _next link for singly linked list and a MemRegion |
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370 // for total space in the VirtualSpace. |
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371 class VirtualSpaceList : public CHeapObj<mtClass> { |
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372 friend class VirtualSpaceNode; |
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373 |
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374 enum VirtualSpaceSizes { |
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375 VirtualSpaceSize = 256 * K |
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376 }; |
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377 |
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378 // Global list of virtual spaces |
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379 // Head of the list |
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380 VirtualSpaceNode* _virtual_space_list; |
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381 // virtual space currently being used for allocations |
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382 VirtualSpaceNode* _current_virtual_space; |
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383 // Free chunk list for all other metadata |
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384 ChunkManager _chunk_manager; |
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385 |
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386 // Can this virtual list allocate >1 spaces? Also, used to determine |
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387 // whether to allocate unlimited small chunks in this virtual space |
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388 bool _is_class; |
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389 bool can_grow() const { return !is_class() || !UseCompressedKlassPointers; } |
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390 |
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391 // Sum of space in all virtual spaces and number of virtual spaces |
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392 size_t _virtual_space_total; |
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393 size_t _virtual_space_count; |
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394 |
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395 ~VirtualSpaceList(); |
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396 |
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397 VirtualSpaceNode* virtual_space_list() const { return _virtual_space_list; } |
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398 |
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399 void set_virtual_space_list(VirtualSpaceNode* v) { |
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400 _virtual_space_list = v; |
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401 } |
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402 void set_current_virtual_space(VirtualSpaceNode* v) { |
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403 _current_virtual_space = v; |
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404 } |
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405 |
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406 void link_vs(VirtualSpaceNode* new_entry, size_t vs_word_size); |
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407 |
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408 // Get another virtual space and add it to the list. This |
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409 // is typically prompted by a failed attempt to allocate a chunk |
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410 // and is typically followed by the allocation of a chunk. |
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411 bool grow_vs(size_t vs_word_size); |
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412 |
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413 public: |
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414 VirtualSpaceList(size_t word_size); |
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415 VirtualSpaceList(ReservedSpace rs); |
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416 |
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417 Metachunk* get_new_chunk(size_t word_size, |
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418 size_t grow_chunks_by_words, |
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419 size_t medium_chunk_bunch); |
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420 |
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421 // Get the first chunk for a Metaspace. Used for |
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422 // special cases such as the boot class loader, reflection |
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423 // class loader and anonymous class loader. |
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424 Metachunk* get_initialization_chunk(size_t word_size, size_t chunk_bunch); |
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425 |
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426 VirtualSpaceNode* current_virtual_space() { |
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427 return _current_virtual_space; |
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428 } |
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429 |
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430 ChunkManager* chunk_manager() { return &_chunk_manager; } |
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431 bool is_class() const { return _is_class; } |
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432 |
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433 // Allocate the first virtualspace. |
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434 void initialize(size_t word_size); |
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435 |
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436 size_t virtual_space_total() { return _virtual_space_total; } |
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437 void inc_virtual_space_total(size_t v) { |
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438 Atomic::add_ptr(v, &_virtual_space_total); |
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439 } |
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440 |
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441 size_t virtual_space_count() { return _virtual_space_count; } |
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442 void inc_virtual_space_count() { |
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443 Atomic::inc_ptr(&_virtual_space_count); |
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444 } |
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445 |
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446 // Used and capacity in the entire list of virtual spaces. |
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447 // These are global values shared by all Metaspaces |
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448 size_t capacity_words_sum(); |
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449 size_t capacity_bytes_sum() { return capacity_words_sum() * BytesPerWord; } |
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450 size_t used_words_sum(); |
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451 size_t used_bytes_sum() { return used_words_sum() * BytesPerWord; } |
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452 |
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453 bool contains(const void *ptr); |
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454 |
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455 void print_on(outputStream* st) const; |
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456 |
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457 class VirtualSpaceListIterator : public StackObj { |
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458 VirtualSpaceNode* _virtual_spaces; |
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459 public: |
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460 VirtualSpaceListIterator(VirtualSpaceNode* virtual_spaces) : |
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461 _virtual_spaces(virtual_spaces) {} |
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462 |
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463 bool repeat() { |
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464 return _virtual_spaces != NULL; |
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465 } |
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466 |
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467 VirtualSpaceNode* get_next() { |
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468 VirtualSpaceNode* result = _virtual_spaces; |
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469 if (_virtual_spaces != NULL) { |
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470 _virtual_spaces = _virtual_spaces->next(); |
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471 } |
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472 return result; |
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473 } |
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474 }; |
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475 }; |
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476 |
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477 class Metadebug : AllStatic { |
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478 // Debugging support for Metaspaces |
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479 static int _deallocate_block_a_lot_count; |
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480 static int _deallocate_chunk_a_lot_count; |
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481 static int _allocation_fail_alot_count; |
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482 |
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483 public: |
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484 static int deallocate_block_a_lot_count() { |
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485 return _deallocate_block_a_lot_count; |
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486 } |
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487 static void set_deallocate_block_a_lot_count(int v) { |
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488 _deallocate_block_a_lot_count = v; |
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489 } |
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490 static void inc_deallocate_block_a_lot_count() { |
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491 _deallocate_block_a_lot_count++; |
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492 } |
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493 static int deallocate_chunk_a_lot_count() { |
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494 return _deallocate_chunk_a_lot_count; |
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495 } |
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496 static void reset_deallocate_chunk_a_lot_count() { |
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497 _deallocate_chunk_a_lot_count = 1; |
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498 } |
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499 static void inc_deallocate_chunk_a_lot_count() { |
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500 _deallocate_chunk_a_lot_count++; |
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501 } |
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502 |
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503 static void init_allocation_fail_alot_count(); |
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504 #ifdef ASSERT |
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505 static bool test_metadata_failure(); |
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506 #endif |
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507 |
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508 static void deallocate_chunk_a_lot(SpaceManager* sm, |
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509 size_t chunk_word_size); |
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510 static void deallocate_block_a_lot(SpaceManager* sm, |
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511 size_t chunk_word_size); |
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512 |
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513 }; |
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514 |
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515 int Metadebug::_deallocate_block_a_lot_count = 0; |
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516 int Metadebug::_deallocate_chunk_a_lot_count = 0; |
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517 int Metadebug::_allocation_fail_alot_count = 0; |
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518 |
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519 // SpaceManager - used by Metaspace to handle allocations |
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520 class SpaceManager : public CHeapObj<mtClass> { |
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521 friend class Metaspace; |
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522 friend class Metadebug; |
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523 |
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524 private: |
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525 |
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526 // protects allocations and contains. |
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527 Mutex* const _lock; |
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528 |
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529 // Chunk related size |
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530 size_t _medium_chunk_bunch; |
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531 |
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532 // List of chunks in use by this SpaceManager. Allocations |
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533 // are done from the current chunk. The list is used for deallocating |
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534 // chunks when the SpaceManager is freed. |
6885 | 535 Metachunk* _chunks_in_use[NumberOfInUseLists]; |
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536 Metachunk* _current_chunk; |
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537 |
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538 // Virtual space where allocation comes from. |
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539 VirtualSpaceList* _vs_list; |
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540 |
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541 // Number of small chunks to allocate to a manager |
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542 // If class space manager, small chunks are unlimited |
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543 static uint const _small_chunk_limit; |
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544 bool has_small_chunk_limit() { return !vs_list()->is_class(); } |
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545 |
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546 // Sum of all space in allocated chunks |
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547 size_t _allocation_total; |
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548 |
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549 // Free lists of blocks are per SpaceManager since they |
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550 // are assumed to be in chunks in use by the SpaceManager |
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551 // and all chunks in use by a SpaceManager are freed when |
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552 // the class loader using the SpaceManager is collected. |
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553 BlockFreelist _block_freelists; |
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554 |
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555 // protects virtualspace and chunk expansions |
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556 static const char* _expand_lock_name; |
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557 static const int _expand_lock_rank; |
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558 static Mutex* const _expand_lock; |
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559 |
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560 private: |
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561 // Accessors |
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562 Metachunk* chunks_in_use(ChunkIndex index) const { return _chunks_in_use[index]; } |
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563 void set_chunks_in_use(ChunkIndex index, Metachunk* v) { _chunks_in_use[index] = v; } |
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564 |
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565 BlockFreelist* block_freelists() const { |
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566 return (BlockFreelist*) &_block_freelists; |
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567 } |
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568 |
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569 VirtualSpaceList* vs_list() const { return _vs_list; } |
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570 |
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571 Metachunk* current_chunk() const { return _current_chunk; } |
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572 void set_current_chunk(Metachunk* v) { |
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573 _current_chunk = v; |
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574 } |
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575 |
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576 Metachunk* find_current_chunk(size_t word_size); |
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577 |
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578 // Add chunk to the list of chunks in use |
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579 void add_chunk(Metachunk* v, bool make_current); |
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580 |
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581 Mutex* lock() const { return _lock; } |
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582 |
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583 const char* chunk_size_name(ChunkIndex index) const; |
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584 |
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585 protected: |
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586 void initialize(); |
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587 |
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588 public: |
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589 SpaceManager(Mutex* lock, |
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590 VirtualSpaceList* vs_list); |
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591 ~SpaceManager(); |
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592 |
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593 enum ChunkMultiples { |
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594 MediumChunkMultiple = 4 |
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595 }; |
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596 |
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597 // Accessors |
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598 size_t specialized_chunk_size() { return SpecializedChunk; } |
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599 size_t small_chunk_size() { return (size_t) vs_list()->is_class() ? ClassSmallChunk : SmallChunk; } |
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600 size_t medium_chunk_size() { return (size_t) vs_list()->is_class() ? ClassMediumChunk : MediumChunk; } |
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601 size_t medium_chunk_bunch() { return medium_chunk_size() * MediumChunkMultiple; } |
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602 |
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603 size_t allocation_total() const { return _allocation_total; } |
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604 void inc_allocation_total(size_t v) { Atomic::add_ptr(v, &_allocation_total); } |
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605 bool is_humongous(size_t word_size) { return word_size > medium_chunk_size(); } |
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606 |
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607 static Mutex* expand_lock() { return _expand_lock; } |
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608 |
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609 // Set the sizes for the initial chunks. |
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610 void get_initial_chunk_sizes(Metaspace::MetaspaceType type, |
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611 size_t* chunk_word_size, |
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612 size_t* class_chunk_word_size); |
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613 |
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614 size_t sum_capacity_in_chunks_in_use() const; |
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615 size_t sum_used_in_chunks_in_use() const; |
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616 size_t sum_free_in_chunks_in_use() const; |
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617 size_t sum_waste_in_chunks_in_use() const; |
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618 size_t sum_waste_in_chunks_in_use(ChunkIndex index ) const; |
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619 |
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620 size_t sum_count_in_chunks_in_use(); |
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621 size_t sum_count_in_chunks_in_use(ChunkIndex i); |
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622 |
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623 Metachunk* get_new_chunk(size_t word_size, size_t grow_chunks_by_words); |
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624 |
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625 // Block allocation and deallocation. |
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626 // Allocates a block from the current chunk |
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627 MetaWord* allocate(size_t word_size); |
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628 |
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629 // Helper for allocations |
6885 | 630 MetaWord* allocate_work(size_t word_size); |
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631 |
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632 // Returns a block to the per manager freelist |
6885 | 633 void deallocate(MetaWord* p, size_t word_size); |
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634 |
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635 // Based on the allocation size and a minimum chunk size, |
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636 // returned chunk size (for expanding space for chunk allocation). |
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637 size_t calc_chunk_size(size_t allocation_word_size); |
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638 |
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639 // Called when an allocation from the current chunk fails. |
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640 // Gets a new chunk (may require getting a new virtual space), |
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641 // and allocates from that chunk. |
6885 | 642 MetaWord* grow_and_allocate(size_t word_size); |
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643 |
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644 // debugging support. |
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645 |
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646 void dump(outputStream* const out) const; |
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647 void print_on(outputStream* st) const; |
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648 void locked_print_chunks_in_use_on(outputStream* st) const; |
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649 |
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650 void verify(); |
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651 void verify_chunk_size(Metachunk* chunk); |
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652 NOT_PRODUCT(void mangle_freed_chunks();) |
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653 #ifdef ASSERT |
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654 void verify_allocation_total(); |
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655 #endif |
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656 }; |
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657 |
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658 uint const SpaceManager::_small_chunk_limit = 4; |
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659 |
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660 const char* SpaceManager::_expand_lock_name = |
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661 "SpaceManager chunk allocation lock"; |
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662 const int SpaceManager::_expand_lock_rank = Monitor::leaf - 1; |
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663 Mutex* const SpaceManager::_expand_lock = |
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664 new Mutex(SpaceManager::_expand_lock_rank, |
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665 SpaceManager::_expand_lock_name, |
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666 Mutex::_allow_vm_block_flag); |
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667 |
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668 // BlockFreelist methods |
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669 |
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670 BlockFreelist::BlockFreelist() : _dictionary(NULL) {} |
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671 |
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672 BlockFreelist::~BlockFreelist() { |
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673 if (_dictionary != NULL) { |
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674 if (Verbose && TraceMetadataChunkAllocation) { |
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675 _dictionary->print_free_lists(gclog_or_tty); |
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676 } |
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677 delete _dictionary; |
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678 } |
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679 } |
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680 |
6885 | 681 Metablock* BlockFreelist::initialize_free_chunk(MetaWord* p, size_t word_size) { |
682 Metablock* block = (Metablock*) p; | |
683 block->set_word_size(word_size); | |
684 block->set_prev(NULL); | |
685 block->set_next(NULL); | |
686 | |
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687 return block; |
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688 } |
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689 |
6885 | 690 void BlockFreelist::return_block(MetaWord* p, size_t word_size) { |
691 Metablock* free_chunk = initialize_free_chunk(p, word_size); | |
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692 if (dictionary() == NULL) { |
6885 | 693 _dictionary = new BlockTreeDictionary(); |
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694 } |
6885 | 695 dictionary()->return_chunk(free_chunk); |
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696 } |
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697 |
6885 | 698 MetaWord* BlockFreelist::get_block(size_t word_size) { |
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699 if (dictionary() == NULL) { |
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700 return NULL; |
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701 } |
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702 |
6885 | 703 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) { |
704 // Dark matter. Too small for dictionary. | |
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705 return NULL; |
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706 } |
6885 | 707 |
708 Metablock* free_block = | |
709 dictionary()->get_chunk(word_size, FreeBlockDictionary<Metablock>::exactly); | |
710 if (free_block == NULL) { | |
711 return NULL; | |
712 } | |
713 | |
714 return (MetaWord*) free_block; | |
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715 } |
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716 |
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717 void BlockFreelist::print_on(outputStream* st) const { |
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718 if (dictionary() == NULL) { |
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719 return; |
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720 } |
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721 dictionary()->print_free_lists(st); |
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722 } |
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723 |
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724 // VirtualSpaceNode methods |
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725 |
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726 VirtualSpaceNode::~VirtualSpaceNode() { |
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727 _rs.release(); |
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728 } |
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729 |
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730 size_t VirtualSpaceNode::used_words_in_vs() const { |
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731 return pointer_delta(top(), bottom(), sizeof(MetaWord)); |
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732 } |
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733 |
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734 // Space committed in the VirtualSpace |
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735 size_t VirtualSpaceNode::capacity_words_in_vs() const { |
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736 return pointer_delta(end(), bottom(), sizeof(MetaWord)); |
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737 } |
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738 |
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739 |
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740 // Allocates the chunk from the virtual space only. |
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741 // This interface is also used internally for debugging. Not all |
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742 // chunks removed here are necessarily used for allocation. |
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743 Metachunk* VirtualSpaceNode::take_from_committed(size_t chunk_word_size) { |
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744 // Bottom of the new chunk |
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745 MetaWord* chunk_limit = top(); |
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746 assert(chunk_limit != NULL, "Not safe to call this method"); |
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747 |
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748 if (!is_available(chunk_word_size)) { |
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749 if (TraceMetadataChunkAllocation) { |
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750 tty->print("VirtualSpaceNode::take_from_committed() not available %d words ", chunk_word_size); |
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751 // Dump some information about the virtual space that is nearly full |
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752 print_on(tty); |
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753 } |
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754 return NULL; |
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755 } |
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756 |
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757 // Take the space (bump top on the current virtual space). |
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758 inc_top(chunk_word_size); |
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759 |
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760 // Point the chunk at the space |
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761 Metachunk* result = Metachunk::initialize(chunk_limit, chunk_word_size); |
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762 return result; |
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763 } |
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764 |
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765 |
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766 // Expand the virtual space (commit more of the reserved space) |
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767 bool VirtualSpaceNode::expand_by(size_t words, bool pre_touch) { |
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768 size_t bytes = words * BytesPerWord; |
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769 bool result = virtual_space()->expand_by(bytes, pre_touch); |
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770 if (TraceMetavirtualspaceAllocation && !result) { |
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771 gclog_or_tty->print_cr("VirtualSpaceNode::expand_by() failed " |
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772 "for byte size " SIZE_FORMAT, bytes); |
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773 virtual_space()->print(); |
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774 } |
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775 return result; |
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776 } |
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777 |
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778 // Shrink the virtual space (commit more of the reserved space) |
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779 bool VirtualSpaceNode::shrink_by(size_t words) { |
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780 size_t bytes = words * BytesPerWord; |
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781 virtual_space()->shrink_by(bytes); |
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782 return true; |
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783 } |
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784 |
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785 // Add another chunk to the chunk list. |
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786 |
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787 Metachunk* VirtualSpaceNode::get_chunk_vs(size_t chunk_word_size) { |
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788 assert_lock_strong(SpaceManager::expand_lock()); |
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789 Metachunk* result = NULL; |
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790 |
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791 return take_from_committed(chunk_word_size); |
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792 } |
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793 |
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794 Metachunk* VirtualSpaceNode::get_chunk_vs_with_expand(size_t chunk_word_size) { |
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795 assert_lock_strong(SpaceManager::expand_lock()); |
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796 |
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797 Metachunk* new_chunk = get_chunk_vs(chunk_word_size); |
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798 |
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799 if (new_chunk == NULL) { |
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800 // Only a small part of the virtualspace is committed when first |
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801 // allocated so committing more here can be expected. |
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802 size_t page_size_words = os::vm_page_size() / BytesPerWord; |
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803 size_t aligned_expand_vs_by_words = align_size_up(chunk_word_size, |
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804 page_size_words); |
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805 expand_by(aligned_expand_vs_by_words, false); |
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806 new_chunk = get_chunk_vs(chunk_word_size); |
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807 } |
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808 return new_chunk; |
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809 } |
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810 |
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811 bool VirtualSpaceNode::initialize() { |
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812 |
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813 if (!_rs.is_reserved()) { |
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814 return false; |
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815 } |
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816 |
7446
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817 // An allocation out of this Virtualspace that is larger |
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818 // than an initial commit size can waste that initial committed |
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819 // space. |
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820 size_t committed_byte_size = 0; |
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821 bool result = virtual_space()->initialize(_rs, committed_byte_size); |
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822 if (result) { |
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823 set_top((MetaWord*)virtual_space()->low()); |
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824 set_reserved(MemRegion((HeapWord*)_rs.base(), |
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825 (HeapWord*)(_rs.base() + _rs.size()))); |
6726
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7195823: NPG: CMS reserved() doesn't match _rs.base().
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826 |
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827 assert(reserved()->start() == (HeapWord*) _rs.base(), |
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828 err_msg("Reserved start was not set properly " PTR_FORMAT |
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829 " != " PTR_FORMAT, reserved()->start(), _rs.base())); |
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830 assert(reserved()->word_size() == _rs.size() / BytesPerWord, |
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831 err_msg("Reserved size was not set properly " SIZE_FORMAT |
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832 " != " SIZE_FORMAT, reserved()->word_size(), |
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833 _rs.size() / BytesPerWord)); |
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834 } |
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835 |
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836 return result; |
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837 } |
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838 |
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839 void VirtualSpaceNode::print_on(outputStream* st) const { |
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840 size_t used = used_words_in_vs(); |
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841 size_t capacity = capacity_words_in_vs(); |
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842 VirtualSpace* vs = virtual_space(); |
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843 st->print_cr(" space @ " PTR_FORMAT " " SIZE_FORMAT "K, %3d%% used " |
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844 "[" PTR_FORMAT ", " PTR_FORMAT ", " |
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845 PTR_FORMAT ", " PTR_FORMAT ")", |
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846 vs, capacity / K, |
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847 capacity == 0 ? 0 : used * 100 / capacity, |
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848 bottom(), top(), end(), |
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849 vs->high_boundary()); |
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850 } |
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851 |
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852 #ifdef ASSERT |
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853 void VirtualSpaceNode::mangle() { |
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854 size_t word_size = capacity_words_in_vs(); |
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855 Copy::fill_to_words((HeapWord*) low(), word_size, 0xf1f1f1f1); |
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856 } |
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857 #endif // ASSERT |
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858 |
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859 // VirtualSpaceList methods |
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860 // Space allocated from the VirtualSpace |
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861 |
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862 VirtualSpaceList::~VirtualSpaceList() { |
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863 VirtualSpaceListIterator iter(virtual_space_list()); |
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864 while (iter.repeat()) { |
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865 VirtualSpaceNode* vsl = iter.get_next(); |
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866 delete vsl; |
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867 } |
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868 } |
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869 |
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870 size_t VirtualSpaceList::used_words_sum() { |
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871 size_t allocated_by_vs = 0; |
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872 VirtualSpaceListIterator iter(virtual_space_list()); |
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873 while (iter.repeat()) { |
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874 VirtualSpaceNode* vsl = iter.get_next(); |
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875 // Sum used region [bottom, top) in each virtualspace |
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876 allocated_by_vs += vsl->used_words_in_vs(); |
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877 } |
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878 assert(allocated_by_vs >= chunk_manager()->free_chunks_total(), |
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879 err_msg("Total in free chunks " SIZE_FORMAT |
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880 " greater than total from virtual_spaces " SIZE_FORMAT, |
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881 allocated_by_vs, chunk_manager()->free_chunks_total())); |
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882 size_t used = |
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883 allocated_by_vs - chunk_manager()->free_chunks_total(); |
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884 return used; |
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885 } |
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886 |
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887 // Space available in all MetadataVirtualspaces allocated |
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888 // for metadata. This is the upper limit on the capacity |
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889 // of chunks allocated out of all the MetadataVirtualspaces. |
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890 size_t VirtualSpaceList::capacity_words_sum() { |
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891 size_t capacity = 0; |
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892 VirtualSpaceListIterator iter(virtual_space_list()); |
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893 while (iter.repeat()) { |
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894 VirtualSpaceNode* vsl = iter.get_next(); |
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895 capacity += vsl->capacity_words_in_vs(); |
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896 } |
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897 return capacity; |
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898 } |
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899 |
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900 VirtualSpaceList::VirtualSpaceList(size_t word_size ) : |
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901 _is_class(false), |
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902 _virtual_space_list(NULL), |
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903 _current_virtual_space(NULL), |
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904 _virtual_space_total(0), |
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905 _virtual_space_count(0) { |
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906 MutexLockerEx cl(SpaceManager::expand_lock(), |
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907 Mutex::_no_safepoint_check_flag); |
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908 bool initialization_succeeded = grow_vs(word_size); |
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909 |
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910 assert(initialization_succeeded, |
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911 " VirtualSpaceList initialization should not fail"); |
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912 } |
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913 |
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914 VirtualSpaceList::VirtualSpaceList(ReservedSpace rs) : |
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915 _is_class(true), |
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916 _virtual_space_list(NULL), |
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917 _current_virtual_space(NULL), |
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918 _virtual_space_total(0), |
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919 _virtual_space_count(0) { |
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920 MutexLockerEx cl(SpaceManager::expand_lock(), |
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921 Mutex::_no_safepoint_check_flag); |
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922 VirtualSpaceNode* class_entry = new VirtualSpaceNode(rs); |
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923 bool succeeded = class_entry->initialize(); |
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924 assert(succeeded, " VirtualSpaceList initialization should not fail"); |
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925 link_vs(class_entry, rs.size()/BytesPerWord); |
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926 } |
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927 |
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928 // Allocate another meta virtual space and add it to the list. |
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929 bool VirtualSpaceList::grow_vs(size_t vs_word_size) { |
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930 assert_lock_strong(SpaceManager::expand_lock()); |
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931 if (vs_word_size == 0) { |
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932 return false; |
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933 } |
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934 // Reserve the space |
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935 size_t vs_byte_size = vs_word_size * BytesPerWord; |
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936 assert(vs_byte_size % os::vm_page_size() == 0, "Not aligned"); |
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937 |
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938 // Allocate the meta virtual space and initialize it. |
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939 VirtualSpaceNode* new_entry = new VirtualSpaceNode(vs_byte_size); |
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940 if (!new_entry->initialize()) { |
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941 delete new_entry; |
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942 return false; |
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943 } else { |
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944 // ensure lock-free iteration sees fully initialized node |
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945 OrderAccess::storestore(); |
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946 link_vs(new_entry, vs_word_size); |
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947 return true; |
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948 } |
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949 } |
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950 |
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951 void VirtualSpaceList::link_vs(VirtualSpaceNode* new_entry, size_t vs_word_size) { |
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952 if (virtual_space_list() == NULL) { |
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953 set_virtual_space_list(new_entry); |
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954 } else { |
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955 current_virtual_space()->set_next(new_entry); |
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956 } |
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957 set_current_virtual_space(new_entry); |
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958 inc_virtual_space_total(vs_word_size); |
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959 inc_virtual_space_count(); |
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960 #ifdef ASSERT |
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961 new_entry->mangle(); |
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962 #endif |
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963 if (TraceMetavirtualspaceAllocation && Verbose) { |
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964 VirtualSpaceNode* vsl = current_virtual_space(); |
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965 vsl->print_on(tty); |
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966 } |
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967 } |
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968 |
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969 Metachunk* VirtualSpaceList::get_new_chunk(size_t word_size, |
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970 size_t grow_chunks_by_words, |
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971 size_t medium_chunk_bunch) { |
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972 |
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973 // Get a chunk from the chunk freelist |
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974 Metachunk* next = chunk_manager()->chunk_freelist_allocate(grow_chunks_by_words); |
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975 |
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976 // Allocate a chunk out of the current virtual space. |
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977 if (next == NULL) { |
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978 next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words); |
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979 } |
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980 |
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981 if (next == NULL) { |
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982 // Not enough room in current virtual space. Try to commit |
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983 // more space. |
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984 size_t expand_vs_by_words = MAX2(medium_chunk_bunch, |
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985 grow_chunks_by_words); |
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986 size_t page_size_words = os::vm_page_size() / BytesPerWord; |
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987 size_t aligned_expand_vs_by_words = align_size_up(expand_vs_by_words, |
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988 page_size_words); |
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989 bool vs_expanded = |
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990 current_virtual_space()->expand_by(aligned_expand_vs_by_words, false); |
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991 if (!vs_expanded) { |
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992 // Should the capacity of the metaspaces be expanded for |
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993 // this allocation? If it's the virtual space for classes and is |
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994 // being used for CompressedHeaders, don't allocate a new virtualspace. |
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995 if (can_grow() && MetaspaceGC::should_expand(this, word_size)) { |
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996 // Get another virtual space. |
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997 size_t grow_vs_words = |
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998 MAX2((size_t)VirtualSpaceSize, aligned_expand_vs_by_words); |
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999 if (grow_vs(grow_vs_words)) { |
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1000 // Got it. It's on the list now. Get a chunk from it. |
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1001 next = current_virtual_space()->get_chunk_vs_with_expand(grow_chunks_by_words); |
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1002 } |
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1003 } else { |
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1004 // Allocation will fail and induce a GC |
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1005 if (TraceMetadataChunkAllocation && Verbose) { |
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1006 gclog_or_tty->print_cr("VirtualSpaceList::get_new_chunk():" |
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1007 " Fail instead of expand the metaspace"); |
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1008 } |
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1009 } |
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1010 } else { |
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1011 // The virtual space expanded, get a new chunk |
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1012 next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words); |
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1013 assert(next != NULL, "Just expanded, should succeed"); |
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1014 } |
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1015 } |
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1016 |
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1017 assert(next == NULL || (next->next() == NULL && next->prev() == NULL), |
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1018 "New chunk is still on some list"); |
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1019 return next; |
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1020 } |
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1021 |
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1022 Metachunk* VirtualSpaceList::get_initialization_chunk(size_t chunk_word_size, |
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1023 size_t chunk_bunch) { |
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1024 // Get a chunk from the chunk freelist |
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1025 Metachunk* new_chunk = get_new_chunk(chunk_word_size, |
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1026 chunk_word_size, |
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1027 chunk_bunch); |
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1028 return new_chunk; |
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1029 } |
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1030 |
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1031 void VirtualSpaceList::print_on(outputStream* st) const { |
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1032 if (TraceMetadataChunkAllocation && Verbose) { |
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1033 VirtualSpaceListIterator iter(virtual_space_list()); |
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1034 while (iter.repeat()) { |
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1035 VirtualSpaceNode* node = iter.get_next(); |
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1036 node->print_on(st); |
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1037 } |
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1038 } |
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1039 } |
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1040 |
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1041 bool VirtualSpaceList::contains(const void *ptr) { |
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1042 VirtualSpaceNode* list = virtual_space_list(); |
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1043 VirtualSpaceListIterator iter(list); |
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1044 while (iter.repeat()) { |
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1045 VirtualSpaceNode* node = iter.get_next(); |
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1046 if (node->reserved()->contains(ptr)) { |
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1047 return true; |
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1048 } |
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1049 } |
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1050 return false; |
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1051 } |
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1052 |
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1053 |
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1054 // MetaspaceGC methods |
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1055 |
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1056 // VM_CollectForMetadataAllocation is the vm operation used to GC. |
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1057 // Within the VM operation after the GC the attempt to allocate the metadata |
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1058 // should succeed. If the GC did not free enough space for the metaspace |
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1059 // allocation, the HWM is increased so that another virtualspace will be |
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1060 // allocated for the metadata. With perm gen the increase in the perm |
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1061 // gen had bounds, MinMetaspaceExpansion and MaxMetaspaceExpansion. The |
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1062 // metaspace policy uses those as the small and large steps for the HWM. |
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1063 // |
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1064 // After the GC the compute_new_size() for MetaspaceGC is called to |
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1065 // resize the capacity of the metaspaces. The current implementation |
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1066 // is based on the flags MinMetaspaceFreeRatio and MaxHeapFreeRatio used |
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1067 // to resize the Java heap by some GC's. New flags can be implemented |
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1068 // if really needed. MinHeapFreeRatio is used to calculate how much |
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1069 // free space is desirable in the metaspace capacity to decide how much |
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1070 // to increase the HWM. MaxMetaspaceFreeRatio is used to decide how much |
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1071 // free space is desirable in the metaspace capacity before decreasing |
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1072 // the HWM. |
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1073 |
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1074 // Calculate the amount to increase the high water mark (HWM). |
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1075 // Increase by a minimum amount (MinMetaspaceExpansion) so that |
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1076 // another expansion is not requested too soon. If that is not |
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1077 // enough to satisfy the allocation (i.e. big enough for a word_size |
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1078 // allocation), increase by MaxMetaspaceExpansion. If that is still |
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1079 // not enough, expand by the size of the allocation (word_size) plus |
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1080 // some. |
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1081 size_t MetaspaceGC::delta_capacity_until_GC(size_t word_size) { |
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1082 size_t before_inc = MetaspaceGC::capacity_until_GC(); |
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1083 size_t min_delta_words = MinMetaspaceExpansion / BytesPerWord; |
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1084 size_t max_delta_words = MaxMetaspaceExpansion / BytesPerWord; |
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1085 size_t page_size_words = os::vm_page_size() / BytesPerWord; |
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1086 size_t size_delta_words = align_size_up(word_size, page_size_words); |
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1087 size_t delta_words = MAX2(size_delta_words, min_delta_words); |
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1088 if (delta_words > min_delta_words) { |
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1089 // Don't want to hit the high water mark on the next |
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1090 // allocation so make the delta greater than just enough |
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1091 // for this allocation. |
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1092 delta_words = MAX2(delta_words, max_delta_words); |
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1093 if (delta_words > max_delta_words) { |
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1094 // This allocation is large but the next ones are probably not |
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1095 // so increase by the minimum. |
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1096 delta_words = delta_words + min_delta_words; |
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1097 } |
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1098 } |
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1099 return delta_words; |
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1100 } |
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1101 |
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1102 bool MetaspaceGC::should_expand(VirtualSpaceList* vsl, size_t word_size) { |
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1103 |
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1104 // Class virtual space should always be expanded. Call GC for the other |
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1105 // metadata virtual space. |
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1106 if (vsl == Metaspace::class_space_list()) return true; |
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1107 |
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1108 // If the user wants a limit, impose one. |
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1109 size_t max_metaspace_size_words = MaxMetaspaceSize / BytesPerWord; |
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1110 size_t metaspace_size_words = MetaspaceSize / BytesPerWord; |
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1111 if (!FLAG_IS_DEFAULT(MaxMetaspaceSize) && |
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1112 vsl->capacity_words_sum() >= max_metaspace_size_words) { |
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1113 return false; |
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1114 } |
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1115 |
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1116 // If this is part of an allocation after a GC, expand |
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1117 // unconditionally. |
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1118 if(MetaspaceGC::expand_after_GC()) { |
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1119 return true; |
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1120 } |
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1121 |
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1122 // If the capacity is below the minimum capacity, allow the |
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1123 // expansion. Also set the high-water-mark (capacity_until_GC) |
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1124 // to that minimum capacity so that a GC will not be induced |
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1125 // until that minimum capacity is exceeded. |
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1126 if (vsl->capacity_words_sum() < metaspace_size_words || |
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1127 capacity_until_GC() == 0) { |
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1128 set_capacity_until_GC(metaspace_size_words); |
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1129 return true; |
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1130 } else { |
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1131 if (vsl->capacity_words_sum() < capacity_until_GC()) { |
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1132 return true; |
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1133 } else { |
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1134 if (TraceMetadataChunkAllocation && Verbose) { |
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1135 gclog_or_tty->print_cr(" allocation request size " SIZE_FORMAT |
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1136 " capacity_until_GC " SIZE_FORMAT |
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1137 " capacity_words_sum " SIZE_FORMAT |
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1138 " used_words_sum " SIZE_FORMAT |
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1139 " free chunks " SIZE_FORMAT |
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1140 " free chunks count %d", |
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1141 word_size, |
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1142 capacity_until_GC(), |
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1143 vsl->capacity_words_sum(), |
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1144 vsl->used_words_sum(), |
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1145 vsl->chunk_manager()->free_chunks_total(), |
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1146 vsl->chunk_manager()->free_chunks_count()); |
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1147 } |
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1148 return false; |
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1149 } |
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1150 } |
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1151 } |
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1152 |
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1153 // Variables are in bytes |
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1154 |
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1155 void MetaspaceGC::compute_new_size() { |
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1156 assert(_shrink_factor <= 100, "invalid shrink factor"); |
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1157 uint current_shrink_factor = _shrink_factor; |
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1158 _shrink_factor = 0; |
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1159 |
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1160 VirtualSpaceList *vsl = Metaspace::space_list(); |
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1161 |
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1162 size_t capacity_after_gc = vsl->capacity_bytes_sum(); |
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1163 // Check to see if these two can be calculated without walking the CLDG |
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1164 size_t used_after_gc = vsl->used_bytes_sum(); |
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1165 size_t capacity_until_GC = vsl->capacity_bytes_sum(); |
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1166 size_t free_after_gc = capacity_until_GC - used_after_gc; |
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1167 |
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1168 const double minimum_free_percentage = MinMetaspaceFreeRatio / 100.0; |
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1169 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
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1170 |
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1171 const double min_tmp = used_after_gc / maximum_used_percentage; |
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1172 size_t minimum_desired_capacity = |
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1173 (size_t)MIN2(min_tmp, double(max_uintx)); |
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1174 // Don't shrink less than the initial generation size |
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1175 minimum_desired_capacity = MAX2(minimum_desired_capacity, |
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1176 MetaspaceSize); |
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1177 |
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1178 if (PrintGCDetails && Verbose) { |
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1179 const double free_percentage = ((double)free_after_gc) / capacity_until_GC; |
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1180 gclog_or_tty->print_cr("\nMetaspaceGC::compute_new_size: "); |
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1181 gclog_or_tty->print_cr(" " |
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1182 " minimum_free_percentage: %6.2f" |
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1183 " maximum_used_percentage: %6.2f", |
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1184 minimum_free_percentage, |
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1185 maximum_used_percentage); |
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1186 double d_free_after_gc = free_after_gc / (double) K; |
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1187 gclog_or_tty->print_cr(" " |
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1188 " free_after_gc : %6.1fK" |
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1189 " used_after_gc : %6.1fK" |
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1190 " capacity_after_gc : %6.1fK" |
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1191 " metaspace HWM : %6.1fK", |
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1192 free_after_gc / (double) K, |
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1193 used_after_gc / (double) K, |
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1194 capacity_after_gc / (double) K, |
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1195 capacity_until_GC / (double) K); |
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1196 gclog_or_tty->print_cr(" " |
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1197 " free_percentage: %6.2f", |
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1198 free_percentage); |
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1199 } |
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1200 |
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1201 |
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1202 if (capacity_until_GC < minimum_desired_capacity) { |
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1203 // If we have less capacity below the metaspace HWM, then |
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1204 // increment the HWM. |
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1205 size_t expand_bytes = minimum_desired_capacity - capacity_until_GC; |
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1206 // Don't expand unless it's significant |
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1207 if (expand_bytes >= MinMetaspaceExpansion) { |
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1208 size_t expand_words = expand_bytes / BytesPerWord; |
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1209 MetaspaceGC::inc_capacity_until_GC(expand_words); |
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1210 } |
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1211 if (PrintGCDetails && Verbose) { |
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1212 size_t new_capacity_until_GC = MetaspaceGC::capacity_until_GC_in_bytes(); |
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1213 gclog_or_tty->print_cr(" expanding:" |
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1214 " minimum_desired_capacity: %6.1fK" |
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1215 " expand_words: %6.1fK" |
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1216 " MinMetaspaceExpansion: %6.1fK" |
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1217 " new metaspace HWM: %6.1fK", |
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1218 minimum_desired_capacity / (double) K, |
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1219 expand_bytes / (double) K, |
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1220 MinMetaspaceExpansion / (double) K, |
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1221 new_capacity_until_GC / (double) K); |
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1222 } |
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1223 return; |
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1224 } |
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1225 |
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1226 // No expansion, now see if we want to shrink |
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1227 size_t shrink_words = 0; |
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1228 // We would never want to shrink more than this |
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1229 size_t max_shrink_words = capacity_until_GC - minimum_desired_capacity; |
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1230 assert(max_shrink_words >= 0, err_msg("max_shrink_words " SIZE_FORMAT, |
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1231 max_shrink_words)); |
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1232 |
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1233 // Should shrinking be considered? |
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1234 if (MaxMetaspaceFreeRatio < 100) { |
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1235 const double maximum_free_percentage = MaxMetaspaceFreeRatio / 100.0; |
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1236 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
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1237 const double max_tmp = used_after_gc / minimum_used_percentage; |
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1238 size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(max_uintx)); |
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1239 maximum_desired_capacity = MAX2(maximum_desired_capacity, |
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1240 MetaspaceSize); |
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1241 if (PrintGC && Verbose) { |
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1242 gclog_or_tty->print_cr(" " |
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1243 " maximum_free_percentage: %6.2f" |
da91efe96a93
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|
1244 " minimum_used_percentage: %6.2f", |
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1245 maximum_free_percentage, |
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|
1246 minimum_used_percentage); |
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1247 gclog_or_tty->print_cr(" " |
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1248 " capacity_until_GC: %6.1fK" |
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1249 " minimum_desired_capacity: %6.1fK" |
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1250 " maximum_desired_capacity: %6.1fK", |
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1251 capacity_until_GC / (double) K, |
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1252 minimum_desired_capacity / (double) K, |
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1253 maximum_desired_capacity / (double) K); |
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1254 } |
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|
1255 |
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1256 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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1257 "sanity check"); |
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1258 |
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1259 if (capacity_until_GC > maximum_desired_capacity) { |
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1260 // Capacity too large, compute shrinking size |
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1261 shrink_words = capacity_until_GC - maximum_desired_capacity; |
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1262 // We don't want shrink all the way back to initSize if people call |
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1263 // System.gc(), because some programs do that between "phases" and then |
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1264 // we'd just have to grow the heap up again for the next phase. So we |
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1265 // damp the shrinking: 0% on the first call, 10% on the second call, 40% |
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1266 // on the third call, and 100% by the fourth call. But if we recompute |
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1267 // size without shrinking, it goes back to 0%. |
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1268 shrink_words = shrink_words / 100 * current_shrink_factor; |
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1269 assert(shrink_words <= max_shrink_words, |
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1270 err_msg("invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT, |
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1271 shrink_words, max_shrink_words)); |
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1272 if (current_shrink_factor == 0) { |
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1273 _shrink_factor = 10; |
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1274 } else { |
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1275 _shrink_factor = MIN2(current_shrink_factor * 4, (uint) 100); |
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1276 } |
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1277 if (PrintGCDetails && Verbose) { |
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1278 gclog_or_tty->print_cr(" " |
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|
1279 " shrinking:" |
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1280 " initSize: %.1fK" |
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1281 " maximum_desired_capacity: %.1fK", |
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|
1282 MetaspaceSize / (double) K, |
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|
1283 maximum_desired_capacity / (double) K); |
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1284 gclog_or_tty->print_cr(" " |
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1285 " shrink_words: %.1fK" |
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1286 " current_shrink_factor: %d" |
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|
1287 " new shrink factor: %d" |
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|
1288 " MinMetaspaceExpansion: %.1fK", |
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diff
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|
1289 shrink_words / (double) K, |
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1290 current_shrink_factor, |
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|
1291 _shrink_factor, |
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|
1292 MinMetaspaceExpansion / (double) K); |
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|
1293 } |
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|
1294 } |
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1295 } |
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1296 |
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1297 |
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1298 // Don't shrink unless it's significant |
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1299 if (shrink_words >= MinMetaspaceExpansion) { |
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1300 VirtualSpaceNode* csp = vsl->current_virtual_space(); |
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1301 size_t available_to_shrink = csp->capacity_words_in_vs() - |
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1302 csp->used_words_in_vs(); |
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1303 shrink_words = MIN2(shrink_words, available_to_shrink); |
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1304 csp->shrink_by(shrink_words); |
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1305 MetaspaceGC::dec_capacity_until_GC(shrink_words); |
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1306 if (PrintGCDetails && Verbose) { |
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1307 size_t new_capacity_until_GC = MetaspaceGC::capacity_until_GC_in_bytes(); |
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1308 gclog_or_tty->print_cr(" metaspace HWM: %.1fK", new_capacity_until_GC / (double) K); |
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1309 } |
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1310 } |
8784
79af1312fc2c
8005602: NPG: classunloading does not happen while CMS GC with -XX:+CMSClassUnloadingEnabled is used
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parents:
8738
diff
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|
1311 assert(used_after_gc <= vsl->capacity_bytes_sum(), |
6725
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1312 "sanity check"); |
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1313 |
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1314 } |
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1315 |
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1316 // Metadebug methods |
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1317 |
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1318 void Metadebug::deallocate_chunk_a_lot(SpaceManager* sm, |
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1319 size_t chunk_word_size){ |
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1320 #ifdef ASSERT |
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1321 VirtualSpaceList* vsl = sm->vs_list(); |
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1322 if (MetaDataDeallocateALot && |
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1323 Metadebug::deallocate_chunk_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) { |
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1324 Metadebug::reset_deallocate_chunk_a_lot_count(); |
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1325 for (uint i = 0; i < metadata_deallocate_a_lock_chunk; i++) { |
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1326 Metachunk* dummy_chunk = vsl->current_virtual_space()->take_from_committed(chunk_word_size); |
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1327 if (dummy_chunk == NULL) { |
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1328 break; |
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|
1329 } |
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1330 vsl->chunk_manager()->chunk_freelist_deallocate(dummy_chunk); |
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1331 |
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1332 if (TraceMetadataChunkAllocation && Verbose) { |
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1333 gclog_or_tty->print("Metadebug::deallocate_chunk_a_lot: %d) ", |
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1334 sm->sum_count_in_chunks_in_use()); |
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1335 dummy_chunk->print_on(gclog_or_tty); |
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1336 gclog_or_tty->print_cr(" Free chunks total %d count %d", |
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1337 vsl->chunk_manager()->free_chunks_total(), |
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|
1338 vsl->chunk_manager()->free_chunks_count()); |
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1339 } |
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1340 } |
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1341 } else { |
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1342 Metadebug::inc_deallocate_chunk_a_lot_count(); |
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1343 } |
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1344 #endif |
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1345 } |
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1346 |
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1347 void Metadebug::deallocate_block_a_lot(SpaceManager* sm, |
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1348 size_t raw_word_size){ |
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1349 #ifdef ASSERT |
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1350 if (MetaDataDeallocateALot && |
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1351 Metadebug::deallocate_block_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) { |
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1352 Metadebug::set_deallocate_block_a_lot_count(0); |
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1353 for (uint i = 0; i < metadata_deallocate_a_lot_block; i++) { |
6885 | 1354 MetaWord* dummy_block = sm->allocate_work(raw_word_size); |
6725
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1355 if (dummy_block == 0) { |
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1356 break; |
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|
1357 } |
6885 | 1358 sm->deallocate(dummy_block, raw_word_size); |
6725
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1359 } |
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1360 } else { |
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1361 Metadebug::inc_deallocate_block_a_lot_count(); |
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1362 } |
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1363 #endif |
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1364 } |
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1365 |
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1366 void Metadebug::init_allocation_fail_alot_count() { |
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1367 if (MetadataAllocationFailALot) { |
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1368 _allocation_fail_alot_count = |
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1369 1+(long)((double)MetadataAllocationFailALotInterval*os::random()/(max_jint+1.0)); |
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1370 } |
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1371 } |
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1372 |
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1373 #ifdef ASSERT |
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1374 bool Metadebug::test_metadata_failure() { |
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1375 if (MetadataAllocationFailALot && |
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1376 Threads::is_vm_complete()) { |
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1377 if (_allocation_fail_alot_count > 0) { |
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1378 _allocation_fail_alot_count--; |
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1379 } else { |
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1380 if (TraceMetadataChunkAllocation && Verbose) { |
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1381 gclog_or_tty->print_cr("Metadata allocation failing for " |
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1382 "MetadataAllocationFailALot"); |
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1383 } |
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1384 init_allocation_fail_alot_count(); |
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1385 return true; |
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1386 } |
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1387 } |
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1388 return false; |
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1389 } |
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1390 #endif |
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1391 |
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1392 // ChunkList methods |
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1393 |
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1394 size_t ChunkList::sum_list_size() { |
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1395 size_t result = 0; |
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1396 Metachunk* cur = head(); |
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1397 while (cur != NULL) { |
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1398 result += cur->word_size(); |
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1399 cur = cur->next(); |
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1400 } |
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1401 return result; |
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1402 } |
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1403 |
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1404 size_t ChunkList::sum_list_count() { |
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1405 size_t result = 0; |
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1406 Metachunk* cur = head(); |
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1407 while (cur != NULL) { |
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1408 result++; |
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1409 cur = cur->next(); |
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1410 } |
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1411 return result; |
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1412 } |
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1413 |
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1414 size_t ChunkList::sum_list_capacity() { |
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1415 size_t result = 0; |
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1416 Metachunk* cur = head(); |
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1417 while (cur != NULL) { |
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1418 result += cur->capacity_word_size(); |
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1419 cur = cur->next(); |
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1420 } |
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1421 return result; |
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1422 } |
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1423 |
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1424 void ChunkList::add_at_head(Metachunk* head, Metachunk* tail) { |
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1425 assert_lock_strong(SpaceManager::expand_lock()); |
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1426 assert(head == tail || tail->next() == NULL, |
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1427 "Not the tail or the head has already been added to a list"); |
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1428 |
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1429 if (TraceMetadataChunkAllocation && Verbose) { |
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1430 gclog_or_tty->print("ChunkList::add_at_head(head, tail): "); |
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1431 Metachunk* cur = head; |
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1432 while (cur != NULL) { |
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1433 gclog_or_tty->print(PTR_FORMAT " (" SIZE_FORMAT ") ", cur, cur->word_size()); |
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1434 cur = cur->next(); |
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1435 } |
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1436 gclog_or_tty->print_cr(""); |
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1437 } |
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1438 |
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1439 if (tail != NULL) { |
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1440 tail->set_next(_head); |
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1441 } |
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1442 set_head(head); |
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1443 } |
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1444 |
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1445 void ChunkList::add_at_head(Metachunk* list) { |
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1446 if (list == NULL) { |
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1447 // Nothing to add |
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1448 return; |
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1449 } |
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1450 assert_lock_strong(SpaceManager::expand_lock()); |
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1451 Metachunk* head = list; |
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1452 Metachunk* tail = list; |
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1453 Metachunk* cur = head->next(); |
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1454 // Search for the tail since it is not passed. |
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1455 while (cur != NULL) { |
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1456 tail = cur; |
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1457 cur = cur->next(); |
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1458 } |
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1459 add_at_head(head, tail); |
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1460 } |
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1461 |
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1462 // ChunkManager methods |
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1463 |
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1464 // Verification of _free_chunks_total and _free_chunks_count does not |
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1465 // work with the CMS collector because its use of additional locks |
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1466 // complicate the mutex deadlock detection but it can still be useful |
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1467 // for detecting errors in the chunk accounting with other collectors. |
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|
1468 |
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1469 size_t ChunkManager::free_chunks_total() { |
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1470 #ifdef ASSERT |
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1471 if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) { |
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1472 MutexLockerEx cl(SpaceManager::expand_lock(), |
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1473 Mutex::_no_safepoint_check_flag); |
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1474 slow_locked_verify_free_chunks_total(); |
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1475 } |
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1476 #endif |
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1477 return _free_chunks_total; |
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1478 } |
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1479 |
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1480 size_t ChunkManager::free_chunks_total_in_bytes() { |
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1481 return free_chunks_total() * BytesPerWord; |
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|
1482 } |
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|
1483 |
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1484 size_t ChunkManager::free_chunks_count() { |
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1485 #ifdef ASSERT |
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1486 if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) { |
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1487 MutexLockerEx cl(SpaceManager::expand_lock(), |
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1488 Mutex::_no_safepoint_check_flag); |
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1489 // This lock is only needed in debug because the verification |
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1490 // of the _free_chunks_totals walks the list of free chunks |
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1491 slow_locked_verify_free_chunks_count(); |
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1492 } |
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1493 #endif |
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1494 return _free_chunks_count; |
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1495 } |
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1496 |
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1497 void ChunkManager::locked_verify_free_chunks_total() { |
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1498 assert_lock_strong(SpaceManager::expand_lock()); |
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1499 assert(sum_free_chunks() == _free_chunks_total, |
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1500 err_msg("_free_chunks_total " SIZE_FORMAT " is not the" |
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1501 " same as sum " SIZE_FORMAT, _free_chunks_total, |
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1502 sum_free_chunks())); |
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1503 } |
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1504 |
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1505 void ChunkManager::verify_free_chunks_total() { |
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1506 MutexLockerEx cl(SpaceManager::expand_lock(), |
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1507 Mutex::_no_safepoint_check_flag); |
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1508 locked_verify_free_chunks_total(); |
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1509 } |
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1510 |
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1511 void ChunkManager::locked_verify_free_chunks_count() { |
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1512 assert_lock_strong(SpaceManager::expand_lock()); |
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1513 assert(sum_free_chunks_count() == _free_chunks_count, |
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1514 err_msg("_free_chunks_count " SIZE_FORMAT " is not the" |
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1515 " same as sum " SIZE_FORMAT, _free_chunks_count, |
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1516 sum_free_chunks_count())); |
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1517 } |
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1518 |
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1519 void ChunkManager::verify_free_chunks_count() { |
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1520 #ifdef ASSERT |
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1521 MutexLockerEx cl(SpaceManager::expand_lock(), |
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1522 Mutex::_no_safepoint_check_flag); |
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1523 locked_verify_free_chunks_count(); |
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1524 #endif |
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1525 } |
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1526 |
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1527 void ChunkManager::verify() { |
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1528 MutexLockerEx cl(SpaceManager::expand_lock(), |
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1529 Mutex::_no_safepoint_check_flag); |
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1530 locked_verify(); |
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1531 } |
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1532 |
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1533 void ChunkManager::locked_verify() { |
6885 | 1534 locked_verify_free_chunks_count(); |
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1535 locked_verify_free_chunks_total(); |
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1536 } |
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1537 |
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1538 void ChunkManager::locked_print_free_chunks(outputStream* st) { |
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1539 assert_lock_strong(SpaceManager::expand_lock()); |
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1540 st->print_cr("Free chunk total " SIZE_FORMAT " count " SIZE_FORMAT, |
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1541 _free_chunks_total, _free_chunks_count); |
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1542 } |
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1543 |
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1544 void ChunkManager::locked_print_sum_free_chunks(outputStream* st) { |
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1545 assert_lock_strong(SpaceManager::expand_lock()); |
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1546 st->print_cr("Sum free chunk total " SIZE_FORMAT " count " SIZE_FORMAT, |
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1547 sum_free_chunks(), sum_free_chunks_count()); |
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1548 } |
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1549 ChunkList* ChunkManager::free_chunks(ChunkIndex index) { |
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1550 return &_free_chunks[index]; |
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1551 } |
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1552 |
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1553 // These methods that sum the free chunk lists are used in printing |
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1554 // methods that are used in product builds. |
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1555 size_t ChunkManager::sum_free_chunks() { |
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1556 assert_lock_strong(SpaceManager::expand_lock()); |
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1557 size_t result = 0; |
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1558 for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) { |
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1559 ChunkList* list = free_chunks(i); |
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1560 |
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1561 if (list == NULL) { |
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1562 continue; |
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1563 } |
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1564 |
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1565 result = result + list->sum_list_capacity(); |
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1566 } |
6885 | 1567 result = result + humongous_dictionary()->total_size(); |
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1568 return result; |
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1569 } |
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1570 |
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1571 size_t ChunkManager::sum_free_chunks_count() { |
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1572 assert_lock_strong(SpaceManager::expand_lock()); |
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1573 size_t count = 0; |
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1574 for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) { |
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1575 ChunkList* list = free_chunks(i); |
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1576 if (list == NULL) { |
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1577 continue; |
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1578 } |
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1579 count = count + list->sum_list_count(); |
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1580 } |
6885 | 1581 count = count + humongous_dictionary()->total_free_blocks(); |
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1582 return count; |
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1583 } |
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1584 |
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1585 ChunkList* ChunkManager::find_free_chunks_list(size_t word_size) { |
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1586 ChunkIndex index = list_index(word_size); |
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1587 assert(index < HumongousIndex, "No humongous list"); |
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1588 return free_chunks(index); |
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1589 } |
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1590 |
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1591 void ChunkManager::free_chunks_put(Metachunk* chunk) { |
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1592 assert_lock_strong(SpaceManager::expand_lock()); |
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1593 ChunkList* free_list = find_free_chunks_list(chunk->word_size()); |
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1594 chunk->set_next(free_list->head()); |
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1595 free_list->set_head(chunk); |
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1596 // chunk is being returned to the chunk free list |
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1597 inc_free_chunks_total(chunk->capacity_word_size()); |
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1598 slow_locked_verify(); |
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1599 } |
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1600 |
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1601 void ChunkManager::chunk_freelist_deallocate(Metachunk* chunk) { |
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1602 // The deallocation of a chunk originates in the freelist |
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1603 // manangement code for a Metaspace and does not hold the |
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1604 // lock. |
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1605 assert(chunk != NULL, "Deallocating NULL"); |
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1606 assert_lock_strong(SpaceManager::expand_lock()); |
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1607 slow_locked_verify(); |
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1608 if (TraceMetadataChunkAllocation) { |
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1609 tty->print_cr("ChunkManager::chunk_freelist_deallocate: chunk " |
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1610 PTR_FORMAT " size " SIZE_FORMAT, |
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1611 chunk, chunk->word_size()); |
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1612 } |
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1613 free_chunks_put(chunk); |
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1614 } |
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1615 |
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1616 Metachunk* ChunkManager::free_chunks_get(size_t word_size) { |
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1617 assert_lock_strong(SpaceManager::expand_lock()); |
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1618 |
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1619 slow_locked_verify(); |
6885 | 1620 |
1621 Metachunk* chunk = NULL; | |
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1622 if (list_index(word_size) != HumongousIndex) { |
6885 | 1623 ChunkList* free_list = find_free_chunks_list(word_size); |
1624 assert(free_list != NULL, "Sanity check"); | |
1625 | |
1626 chunk = free_list->head(); | |
1627 debug_only(Metachunk* debug_head = chunk;) | |
1628 | |
1629 if (chunk == NULL) { | |
1630 return NULL; | |
1631 } | |
1632 | |
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1633 // Remove the chunk as the head of the list. |
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1634 free_list->set_head(chunk->next()); |
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1635 |
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1636 // Chunk is being removed from the chunks free list. |
6885 | 1637 dec_free_chunks_total(chunk->capacity_word_size()); |
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1638 |
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1639 if (TraceMetadataChunkAllocation && Verbose) { |
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1640 tty->print_cr("ChunkManager::free_chunks_get: free_list " |
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1641 PTR_FORMAT " head " PTR_FORMAT " size " SIZE_FORMAT, |
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1642 free_list, chunk, chunk->word_size()); |
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1643 } |
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1644 } else { |
6885 | 1645 chunk = humongous_dictionary()->get_chunk( |
1646 word_size, | |
1647 FreeBlockDictionary<Metachunk>::atLeast); | |
1648 | |
1649 if (chunk != NULL) { | |
1650 if (TraceMetadataHumongousAllocation) { | |
1651 size_t waste = chunk->word_size() - word_size; | |
1652 tty->print_cr("Free list allocate humongous chunk size " SIZE_FORMAT | |
1653 " for requested size " SIZE_FORMAT | |
1654 " waste " SIZE_FORMAT, | |
1655 chunk->word_size(), word_size, waste); | |
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1656 } |
6885 | 1657 // Chunk is being removed from the chunks free list. |
1658 dec_free_chunks_total(chunk->capacity_word_size()); | |
1659 #ifdef ASSERT | |
1660 chunk->set_is_free(false); | |
1661 #endif | |
7446
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1662 } else { |
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1663 return NULL; |
6885 | 1664 } |
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1665 } |
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1666 |
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1667 // Remove it from the links to this freelist |
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1668 chunk->set_next(NULL); |
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1669 chunk->set_prev(NULL); |
6969
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|
1670 slow_locked_verify(); |
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1671 return chunk; |
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1672 } |
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1673 |
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1674 Metachunk* ChunkManager::chunk_freelist_allocate(size_t word_size) { |
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1675 assert_lock_strong(SpaceManager::expand_lock()); |
6969
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1676 slow_locked_verify(); |
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1677 |
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1678 // Take from the beginning of the list |
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1679 Metachunk* chunk = free_chunks_get(word_size); |
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1680 if (chunk == NULL) { |
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1681 return NULL; |
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|
1682 } |
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1683 |
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1684 assert((word_size <= chunk->word_size()) || |
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1685 list_index(chunk->word_size() == HumongousIndex), |
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1686 "Non-humongous variable sized chunk"); |
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1687 if (TraceMetadataChunkAllocation) { |
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1688 size_t list_count; |
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1689 if (list_index(word_size) < HumongousIndex) { |
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1690 ChunkList* list = find_free_chunks_list(word_size); |
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1691 list_count = list->sum_list_count(); |
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1692 } else { |
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1693 list_count = humongous_dictionary()->total_count(); |
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1694 } |
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1695 tty->print("ChunkManager::chunk_freelist_allocate: " PTR_FORMAT " chunk " |
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1696 PTR_FORMAT " size " SIZE_FORMAT " count " SIZE_FORMAT " ", |
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1697 this, chunk, chunk->word_size(), list_count); |
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1698 locked_print_free_chunks(tty); |
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|
1699 } |
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|
1700 |
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1701 return chunk; |
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|
1702 } |
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1703 |
6885 | 1704 void ChunkManager::print_on(outputStream* out) { |
1705 if (PrintFLSStatistics != 0) { | |
1706 humongous_dictionary()->report_statistics(); | |
1707 } | |
1708 } | |
1709 | |
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1710 // SpaceManager methods |
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1711 |
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1712 void SpaceManager::get_initial_chunk_sizes(Metaspace::MetaspaceType type, |
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1713 size_t* chunk_word_size, |
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1714 size_t* class_chunk_word_size) { |
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1715 switch (type) { |
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|
1716 case Metaspace::BootMetaspaceType: |
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1717 *chunk_word_size = Metaspace::first_chunk_word_size(); |
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1718 *class_chunk_word_size = Metaspace::first_class_chunk_word_size(); |
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1719 break; |
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|
1720 case Metaspace::ROMetaspaceType: |
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1721 *chunk_word_size = SharedReadOnlySize / wordSize; |
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1722 *class_chunk_word_size = ClassSpecializedChunk; |
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1723 break; |
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|
1724 case Metaspace::ReadWriteMetaspaceType: |
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1725 *chunk_word_size = SharedReadWriteSize / wordSize; |
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1726 *class_chunk_word_size = ClassSpecializedChunk; |
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|
1727 break; |
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|
1728 case Metaspace::AnonymousMetaspaceType: |
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1729 case Metaspace::ReflectionMetaspaceType: |
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|
1730 *chunk_word_size = SpecializedChunk; |
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1731 *class_chunk_word_size = ClassSpecializedChunk; |
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|
1732 break; |
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|
1733 default: |
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|
1734 *chunk_word_size = SmallChunk; |
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|
1735 *class_chunk_word_size = ClassSmallChunk; |
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|
1736 break; |
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|
1737 } |
8007
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7447
diff
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|
1738 assert(*chunk_word_size != 0 && *class_chunk_word_size != 0, |
7446
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1739 err_msg("Initial chunks sizes bad: data " SIZE_FORMAT |
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1740 " class " SIZE_FORMAT, |
8007
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7447
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|
1741 *chunk_word_size, *class_chunk_word_size)); |
7446
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|
1742 } |
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|
1743 |
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1744 size_t SpaceManager::sum_free_in_chunks_in_use() const { |
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1745 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
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1746 size_t free = 0; |
7446
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1747 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
6725
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1748 Metachunk* chunk = chunks_in_use(i); |
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1749 while (chunk != NULL) { |
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1750 free += chunk->free_word_size(); |
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1751 chunk = chunk->next(); |
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|
1752 } |
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|
1753 } |
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|
1754 return free; |
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|
1755 } |
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|
1756 |
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1757 size_t SpaceManager::sum_waste_in_chunks_in_use() const { |
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1758 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
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1759 size_t result = 0; |
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1760 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
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1761 result += sum_waste_in_chunks_in_use(i); |
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1762 } |
6885 | 1763 |
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|
1764 return result; |
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|
1765 } |
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|
1766 |
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|
1767 size_t SpaceManager::sum_waste_in_chunks_in_use(ChunkIndex index) const { |
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|
1768 size_t result = 0; |
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|
1769 Metachunk* chunk = chunks_in_use(index); |
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|
1770 // Count the free space in all the chunk but not the |
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|
1771 // current chunk from which allocations are still being done. |
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|
1772 if (chunk != NULL) { |
6885 | 1773 Metachunk* prev = chunk; |
1774 while (chunk != NULL && chunk != current_chunk()) { | |
1775 result += chunk->free_word_size(); | |
1776 prev = chunk; | |
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|
1777 chunk = chunk->next(); |
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|
1778 } |
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|
1779 } |
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|
1780 return result; |
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|
1781 } |
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|
1782 |
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|
1783 size_t SpaceManager::sum_capacity_in_chunks_in_use() const { |
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|
1784 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
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|
1785 size_t sum = 0; |
7446
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1786 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
6725
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|
1787 Metachunk* chunk = chunks_in_use(i); |
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1788 while (chunk != NULL) { |
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1789 // Just changed this sum += chunk->capacity_word_size(); |
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1790 // sum += chunk->word_size() - Metachunk::overhead(); |
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1791 sum += chunk->capacity_word_size(); |
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1792 chunk = chunk->next(); |
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1793 } |
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1794 } |
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1795 return sum; |
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1796 } |
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1797 |
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1798 size_t SpaceManager::sum_count_in_chunks_in_use() { |
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1799 size_t count = 0; |
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1800 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
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1801 count = count + sum_count_in_chunks_in_use(i); |
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1802 } |
6885 | 1803 |
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1804 return count; |
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1805 } |
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1806 |
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1807 size_t SpaceManager::sum_count_in_chunks_in_use(ChunkIndex i) { |
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1808 size_t count = 0; |
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1809 Metachunk* chunk = chunks_in_use(i); |
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1810 while (chunk != NULL) { |
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1811 count++; |
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1812 chunk = chunk->next(); |
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1813 } |
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1814 return count; |
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1815 } |
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1816 |
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1817 |
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1818 size_t SpaceManager::sum_used_in_chunks_in_use() const { |
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1819 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
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1820 size_t used = 0; |
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1821 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
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1822 Metachunk* chunk = chunks_in_use(i); |
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1823 while (chunk != NULL) { |
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1824 used += chunk->used_word_size(); |
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1825 chunk = chunk->next(); |
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1826 } |
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1827 } |
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1828 return used; |
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1829 } |
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1830 |
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1831 void SpaceManager::locked_print_chunks_in_use_on(outputStream* st) const { |
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1832 |
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1833 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
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1834 Metachunk* chunk = chunks_in_use(i); |
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1835 st->print("SpaceManager: %s " PTR_FORMAT, |
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1836 chunk_size_name(i), chunk); |
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1837 if (chunk != NULL) { |
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1838 st->print_cr(" free " SIZE_FORMAT, |
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1839 chunk->free_word_size()); |
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1840 } else { |
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1841 st->print_cr(""); |
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1842 } |
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1843 } |
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1844 |
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1845 vs_list()->chunk_manager()->locked_print_free_chunks(st); |
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1846 vs_list()->chunk_manager()->locked_print_sum_free_chunks(st); |
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1847 } |
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1848 |
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1849 size_t SpaceManager::calc_chunk_size(size_t word_size) { |
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1850 |
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1851 // Decide between a small chunk and a medium chunk. Up to |
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1852 // _small_chunk_limit small chunks can be allocated but |
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1853 // once a medium chunk has been allocated, no more small |
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1854 // chunks will be allocated. |
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1855 size_t chunk_word_size; |
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1856 if (chunks_in_use(MediumIndex) == NULL && |
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1857 (!has_small_chunk_limit() || |
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1858 sum_count_in_chunks_in_use(SmallIndex) < _small_chunk_limit)) { |
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1859 chunk_word_size = (size_t) small_chunk_size(); |
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1860 if (word_size + Metachunk::overhead() > small_chunk_size()) { |
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1861 chunk_word_size = medium_chunk_size(); |
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1862 } |
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1863 } else { |
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1864 chunk_word_size = medium_chunk_size(); |
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1865 } |
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1866 |
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1867 // Might still need a humongous chunk. Enforce an |
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1868 // eight word granularity to facilitate reuse (some |
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1869 // wastage but better chance of reuse). |
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1870 size_t if_humongous_sized_chunk = |
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1871 align_size_up(word_size + Metachunk::overhead(), |
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1872 HumongousChunkGranularity); |
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1873 chunk_word_size = |
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1874 MAX2((size_t) chunk_word_size, if_humongous_sized_chunk); |
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1875 |
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1876 assert(!SpaceManager::is_humongous(word_size) || |
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1877 chunk_word_size == if_humongous_sized_chunk, |
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1878 err_msg("Size calculation is wrong, word_size " SIZE_FORMAT |
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1879 " chunk_word_size " SIZE_FORMAT, |
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1880 word_size, chunk_word_size)); |
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1881 if (TraceMetadataHumongousAllocation && |
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1882 SpaceManager::is_humongous(word_size)) { |
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1883 gclog_or_tty->print_cr("Metadata humongous allocation:"); |
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1884 gclog_or_tty->print_cr(" word_size " PTR_FORMAT, word_size); |
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1885 gclog_or_tty->print_cr(" chunk_word_size " PTR_FORMAT, |
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1886 chunk_word_size); |
6885 | 1887 gclog_or_tty->print_cr(" chunk overhead " PTR_FORMAT, |
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1888 Metachunk::overhead()); |
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1889 } |
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1890 return chunk_word_size; |
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1891 } |
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1892 |
6885 | 1893 MetaWord* SpaceManager::grow_and_allocate(size_t word_size) { |
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1894 assert(vs_list()->current_virtual_space() != NULL, |
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1895 "Should have been set"); |
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1896 assert(current_chunk() == NULL || |
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1897 current_chunk()->allocate(word_size) == NULL, |
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1898 "Don't need to expand"); |
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1899 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag); |
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1900 |
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1901 if (TraceMetadataChunkAllocation && Verbose) { |
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1902 size_t words_left = 0; |
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1903 size_t words_used = 0; |
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1904 if (current_chunk() != NULL) { |
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1905 words_left = current_chunk()->free_word_size(); |
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1906 words_used = current_chunk()->used_word_size(); |
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1907 } |
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1908 gclog_or_tty->print_cr("SpaceManager::grow_and_allocate for " SIZE_FORMAT |
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1909 " words " SIZE_FORMAT " words used " SIZE_FORMAT |
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1910 " words left", |
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1911 word_size, words_used, words_left); |
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1912 } |
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1913 |
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1914 // Get another chunk out of the virtual space |
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1915 size_t grow_chunks_by_words = calc_chunk_size(word_size); |
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1916 Metachunk* next = get_new_chunk(word_size, grow_chunks_by_words); |
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1917 |
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1918 // If a chunk was available, add it to the in-use chunk list |
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1919 // and do an allocation from it. |
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1920 if (next != NULL) { |
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1921 Metadebug::deallocate_chunk_a_lot(this, grow_chunks_by_words); |
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1922 // Add to this manager's list of chunks in use. |
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1923 add_chunk(next, false); |
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1924 return next->allocate(word_size); |
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1925 } |
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1926 return NULL; |
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1927 } |
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1928 |
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1929 void SpaceManager::print_on(outputStream* st) const { |
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1930 |
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1931 for (ChunkIndex i = ZeroIndex; |
6885 | 1932 i < NumberOfInUseLists ; |
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1933 i = next_chunk_index(i) ) { |
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1934 st->print_cr(" chunks_in_use " PTR_FORMAT " chunk size " PTR_FORMAT, |
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1935 chunks_in_use(i), |
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1936 chunks_in_use(i) == NULL ? 0 : chunks_in_use(i)->word_size()); |
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1937 } |
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1938 st->print_cr(" waste: Small " SIZE_FORMAT " Medium " SIZE_FORMAT |
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1939 " Humongous " SIZE_FORMAT, |
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1940 sum_waste_in_chunks_in_use(SmallIndex), |
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1941 sum_waste_in_chunks_in_use(MediumIndex), |
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1942 sum_waste_in_chunks_in_use(HumongousIndex)); |
6885 | 1943 // block free lists |
1944 if (block_freelists() != NULL) { | |
1945 st->print_cr("total in block free lists " SIZE_FORMAT, | |
1946 block_freelists()->total_size()); | |
1947 } | |
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1948 } |
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1949 |
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1950 SpaceManager::SpaceManager(Mutex* lock, |
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1951 VirtualSpaceList* vs_list) : |
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1952 _vs_list(vs_list), |
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1953 _allocation_total(0), |
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1954 _lock(lock) |
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1955 { |
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1956 initialize(); |
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1957 } |
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1958 |
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1959 void SpaceManager::initialize() { |
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1960 Metadebug::init_allocation_fail_alot_count(); |
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1961 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
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1962 _chunks_in_use[i] = NULL; |
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1963 } |
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1964 _current_chunk = NULL; |
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1965 if (TraceMetadataChunkAllocation && Verbose) { |
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1966 gclog_or_tty->print_cr("SpaceManager(): " PTR_FORMAT, this); |
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1967 } |
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1968 } |
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1969 |
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1970 SpaceManager::~SpaceManager() { |
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1971 // This call this->_lock which can't be done while holding expand_lock() |
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1972 const size_t in_use_before = sum_capacity_in_chunks_in_use(); |
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1973 |
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1974 MutexLockerEx fcl(SpaceManager::expand_lock(), |
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1975 Mutex::_no_safepoint_check_flag); |
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1976 |
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1977 ChunkManager* chunk_manager = vs_list()->chunk_manager(); |
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1978 |
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1979 chunk_manager->slow_locked_verify(); |
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1980 |
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1981 if (TraceMetadataChunkAllocation && Verbose) { |
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1982 gclog_or_tty->print_cr("~SpaceManager(): " PTR_FORMAT, this); |
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1983 locked_print_chunks_in_use_on(gclog_or_tty); |
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1984 } |
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1985 |
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1986 // Mangle freed memory. |
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1987 NOT_PRODUCT(mangle_freed_chunks();) |
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1988 |
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1989 // Have to update before the chunks_in_use lists are emptied |
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1990 // below. |
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1991 chunk_manager->inc_free_chunks_total(in_use_before, |
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1992 sum_count_in_chunks_in_use()); |
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1993 |
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1994 // Add all the chunks in use by this space manager |
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1995 // to the global list of free chunks. |
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1996 |
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1997 // Follow each list of chunks-in-use and add them to the |
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1998 // free lists. Each list is NULL terminated. |
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1999 |
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2000 for (ChunkIndex i = ZeroIndex; i < HumongousIndex; i = next_chunk_index(i)) { |
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2001 if (TraceMetadataChunkAllocation && Verbose) { |
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2002 gclog_or_tty->print_cr("returned %d %s chunks to freelist", |
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2003 sum_count_in_chunks_in_use(i), |
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2004 chunk_size_name(i)); |
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2005 } |
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2006 Metachunk* chunks = chunks_in_use(i); |
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2007 chunk_manager->free_chunks(i)->add_at_head(chunks); |
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2008 set_chunks_in_use(i, NULL); |
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2009 if (TraceMetadataChunkAllocation && Verbose) { |
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2010 gclog_or_tty->print_cr("updated freelist count %d %s", |
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2011 chunk_manager->free_chunks(i)->sum_list_count(), |
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2012 chunk_size_name(i)); |
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2013 } |
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2014 assert(i != HumongousIndex, "Humongous chunks are handled explicitly later"); |
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2015 } |
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2016 |
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2017 // The medium chunk case may be optimized by passing the head and |
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2018 // tail of the medium chunk list to add_at_head(). The tail is often |
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2019 // the current chunk but there are probably exceptions. |
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2020 |
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2021 // Humongous chunks |
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2022 if (TraceMetadataChunkAllocation && Verbose) { |
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2023 gclog_or_tty->print_cr("returned %d %s humongous chunks to dictionary", |
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2024 sum_count_in_chunks_in_use(HumongousIndex), |
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2025 chunk_size_name(HumongousIndex)); |
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2026 gclog_or_tty->print("Humongous chunk dictionary: "); |
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2027 } |
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2028 // Humongous chunks are never the current chunk. |
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2029 Metachunk* humongous_chunks = chunks_in_use(HumongousIndex); |
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2030 |
6885 | 2031 while (humongous_chunks != NULL) { |
2032 #ifdef ASSERT | |
2033 humongous_chunks->set_is_free(true); | |
2034 #endif | |
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2035 if (TraceMetadataChunkAllocation && Verbose) { |
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2036 gclog_or_tty->print(PTR_FORMAT " (" SIZE_FORMAT ") ", |
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2037 humongous_chunks, |
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2038 humongous_chunks->word_size()); |
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2039 } |
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2040 assert(humongous_chunks->word_size() == (size_t) |
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2041 align_size_up(humongous_chunks->word_size(), |
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2042 HumongousChunkGranularity), |
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2043 err_msg("Humongous chunk size is wrong: word size " SIZE_FORMAT |
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2044 " granularity %d", |
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2045 humongous_chunks->word_size(), HumongousChunkGranularity)); |
6885 | 2046 Metachunk* next_humongous_chunks = humongous_chunks->next(); |
2047 chunk_manager->humongous_dictionary()->return_chunk(humongous_chunks); | |
2048 humongous_chunks = next_humongous_chunks; | |
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2049 } |
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2050 if (TraceMetadataChunkAllocation && Verbose) { |
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2051 gclog_or_tty->print_cr(""); |
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2052 gclog_or_tty->print_cr("updated dictionary count %d %s", |
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2053 chunk_manager->humongous_dictionary()->total_count(), |
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2054 chunk_size_name(HumongousIndex)); |
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2055 } |
6885 | 2056 set_chunks_in_use(HumongousIndex, NULL); |
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2057 chunk_manager->slow_locked_verify(); |
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2058 } |
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2059 |
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2060 const char* SpaceManager::chunk_size_name(ChunkIndex index) const { |
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2061 switch (index) { |
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2062 case SpecializedIndex: |
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2063 return "Specialized"; |
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2064 case SmallIndex: |
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2065 return "Small"; |
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2066 case MediumIndex: |
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2067 return "Medium"; |
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2068 case HumongousIndex: |
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2069 return "Humongous"; |
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2070 default: |
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2071 return NULL; |
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2072 } |
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2073 } |
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2074 |
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2075 ChunkIndex ChunkManager::list_index(size_t size) { |
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2076 switch (size) { |
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2077 case SpecializedChunk: |
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2078 assert(SpecializedChunk == ClassSpecializedChunk, |
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2079 "Need branch for ClassSpecializedChunk"); |
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2080 return SpecializedIndex; |
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2081 case SmallChunk: |
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2082 case ClassSmallChunk: |
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2083 return SmallIndex; |
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2084 case MediumChunk: |
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2085 case ClassMediumChunk: |
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2086 return MediumIndex; |
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2087 default: |
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2088 assert(size > MediumChunk || size > ClassMediumChunk, |
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2089 "Not a humongous chunk"); |
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2090 return HumongousIndex; |
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2091 } |
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2092 } |
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2093 |
6885 | 2094 void SpaceManager::deallocate(MetaWord* p, size_t word_size) { |
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2095 assert_lock_strong(_lock); |
6885 | 2096 size_t min_size = TreeChunk<Metablock, FreeList>::min_size(); |
2097 assert(word_size >= min_size, | |
2098 err_msg("Should not deallocate dark matter " SIZE_FORMAT, word_size)); | |
2099 block_freelists()->return_block(p, word_size); | |
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2100 } |
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2101 |
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2102 // Adds a chunk to the list of chunks in use. |
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2103 void SpaceManager::add_chunk(Metachunk* new_chunk, bool make_current) { |
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2104 |
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2105 assert(new_chunk != NULL, "Should not be NULL"); |
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2106 assert(new_chunk->next() == NULL, "Should not be on a list"); |
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2107 |
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2108 new_chunk->reset_empty(); |
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2109 |
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2110 // Find the correct list and and set the current |
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2111 // chunk for that list. |
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2112 ChunkIndex index = ChunkManager::list_index(new_chunk->word_size()); |
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2113 |
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2114 if (index != HumongousIndex) { |
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2115 set_current_chunk(new_chunk); |
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2116 new_chunk->set_next(chunks_in_use(index)); |
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2117 set_chunks_in_use(index, new_chunk); |
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2118 } else { |
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2119 // For null class loader data and DumpSharedSpaces, the first chunk isn't |
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2120 // small, so small will be null. Link this first chunk as the current |
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2121 // chunk. |
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2122 if (make_current) { |
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2123 // Set as the current chunk but otherwise treat as a humongous chunk. |
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2124 set_current_chunk(new_chunk); |
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2125 } |
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2126 // Link at head. The _current_chunk only points to a humongous chunk for |
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2127 // the null class loader metaspace (class and data virtual space managers) |
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2128 // any humongous chunks so will not point to the tail |
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2129 // of the humongous chunks list. |
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2130 new_chunk->set_next(chunks_in_use(HumongousIndex)); |
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2131 set_chunks_in_use(HumongousIndex, new_chunk); |
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2132 |
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2133 assert(new_chunk->word_size() > medium_chunk_size(), "List inconsistency"); |
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2134 } |
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2135 |
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2136 assert(new_chunk->is_empty(), "Not ready for reuse"); |
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2137 if (TraceMetadataChunkAllocation && Verbose) { |
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2138 gclog_or_tty->print("SpaceManager::add_chunk: %d) ", |
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2139 sum_count_in_chunks_in_use()); |
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2140 new_chunk->print_on(gclog_or_tty); |
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2141 vs_list()->chunk_manager()->locked_print_free_chunks(tty); |
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2142 } |
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2143 } |
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2144 |
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2145 Metachunk* SpaceManager::get_new_chunk(size_t word_size, |
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2146 size_t grow_chunks_by_words) { |
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2147 |
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2148 Metachunk* next = vs_list()->get_new_chunk(word_size, |
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2149 grow_chunks_by_words, |
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2150 medium_chunk_bunch()); |
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2151 |
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2152 if (TraceMetadataHumongousAllocation && |
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2153 SpaceManager::is_humongous(next->word_size())) { |
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2154 gclog_or_tty->print_cr(" new humongous chunk word size " PTR_FORMAT, |
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2155 next->word_size()); |
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2156 } |
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2157 |
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2158 return next; |
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2159 } |
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2160 |
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2161 MetaWord* SpaceManager::allocate(size_t word_size) { |
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2162 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
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2163 |
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2164 // If only the dictionary is going to be used (i.e., no |
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2165 // indexed free list), then there is a minimum size requirement. |
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2166 // MinChunkSize is a placeholder for the real minimum size JJJ |
6885 | 2167 size_t byte_size = word_size * BytesPerWord; |
2168 | |
2169 size_t byte_size_with_overhead = byte_size + Metablock::overhead(); | |
2170 | |
2171 size_t raw_bytes_size = MAX2(byte_size_with_overhead, | |
2172 Metablock::min_block_byte_size()); | |
2173 raw_bytes_size = ARENA_ALIGN(raw_bytes_size); | |
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2174 size_t raw_word_size = raw_bytes_size / BytesPerWord; |
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2175 assert(raw_word_size * BytesPerWord == raw_bytes_size, "Size problem"); |
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2176 |
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2177 BlockFreelist* fl = block_freelists(); |
6885 | 2178 MetaWord* p = NULL; |
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2179 // Allocation from the dictionary is expensive in the sense that |
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2180 // the dictionary has to be searched for a size. Don't allocate |
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2181 // from the dictionary until it starts to get fat. Is this |
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2182 // a reasonable policy? Maybe an skinny dictionary is fast enough |
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2183 // for allocations. Do some profiling. JJJ |
6885 | 2184 if (fl->total_size() > allocation_from_dictionary_limit) { |
2185 p = fl->get_block(raw_word_size); | |
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2186 } |
6885 | 2187 if (p == NULL) { |
2188 p = allocate_work(raw_word_size); | |
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2189 } |
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2190 Metadebug::deallocate_block_a_lot(this, raw_word_size); |
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2191 |
6885 | 2192 return p; |
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2193 } |
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2194 |
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2195 // Returns the address of spaced allocated for "word_size". |
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2196 // This methods does not know about blocks (Metablocks) |
6885 | 2197 MetaWord* SpaceManager::allocate_work(size_t word_size) { |
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2198 assert_lock_strong(_lock); |
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2199 #ifdef ASSERT |
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2200 if (Metadebug::test_metadata_failure()) { |
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2201 return NULL; |
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2202 } |
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2203 #endif |
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2204 // Is there space in the current chunk? |
6885 | 2205 MetaWord* result = NULL; |
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2206 |
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2207 // For DumpSharedSpaces, only allocate out of the current chunk which is |
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2208 // never null because we gave it the size we wanted. Caller reports out |
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2209 // of memory if this returns null. |
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2210 if (DumpSharedSpaces) { |
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2211 assert(current_chunk() != NULL, "should never happen"); |
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2212 inc_allocation_total(word_size); |
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2213 return current_chunk()->allocate(word_size); // caller handles null result |
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2214 } |
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2215 if (current_chunk() != NULL) { |
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2216 result = current_chunk()->allocate(word_size); |
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2217 } |
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2218 |
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2219 if (result == NULL) { |
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2220 result = grow_and_allocate(word_size); |
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2221 } |
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2222 if (result > 0) { |
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2223 inc_allocation_total(word_size); |
6885 | 2224 assert(result != (MetaWord*) chunks_in_use(MediumIndex), |
2225 "Head of the list is being allocated"); | |
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2226 } |
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2227 |
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2228 return result; |
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2229 } |
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2230 |
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2231 void SpaceManager::verify() { |
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2232 // If there are blocks in the dictionary, then |
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2233 // verfication of chunks does not work since |
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2234 // being in the dictionary alters a chunk. |
6885 | 2235 if (block_freelists()->total_size() == 0) { |
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2236 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
6725
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2237 Metachunk* curr = chunks_in_use(i); |
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2238 while (curr != NULL) { |
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2239 curr->verify(); |
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2240 verify_chunk_size(curr); |
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2241 curr = curr->next(); |
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2242 } |
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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 void SpaceManager::verify_chunk_size(Metachunk* chunk) { |
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2248 assert(is_humongous(chunk->word_size()) || |
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2249 chunk->word_size() == medium_chunk_size() || |
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2250 chunk->word_size() == small_chunk_size() || |
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2251 chunk->word_size() == specialized_chunk_size(), |
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2252 "Chunk size is wrong"); |
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2253 return; |
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|
2254 } |
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|
2255 |
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2256 #ifdef ASSERT |
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2257 void SpaceManager::verify_allocation_total() { |
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2258 // Verification is only guaranteed at a safepoint. |
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2259 if (SafepointSynchronize::is_at_safepoint()) { |
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2260 gclog_or_tty->print_cr("Chunk " PTR_FORMAT " allocation_total " SIZE_FORMAT |
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2261 " sum_used_in_chunks_in_use " SIZE_FORMAT, |
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|
2262 this, |
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2263 allocation_total(), |
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2264 sum_used_in_chunks_in_use()); |
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2265 } |
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|
2266 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
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2267 assert(allocation_total() == sum_used_in_chunks_in_use(), |
8007
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mikael
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2268 err_msg("allocation total is not consistent " SIZE_FORMAT |
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|
2269 " vs " SIZE_FORMAT, |
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2270 allocation_total(), sum_used_in_chunks_in_use())); |
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|
2271 } |
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|
2272 |
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|
2273 #endif |
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|
2274 |
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|
2275 void SpaceManager::dump(outputStream* const out) const { |
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|
2276 size_t curr_total = 0; |
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|
2277 size_t waste = 0; |
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|
2278 uint i = 0; |
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2279 size_t used = 0; |
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|
2280 size_t capacity = 0; |
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|
2281 |
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|
2282 // Add up statistics for all chunks in this SpaceManager. |
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2283 for (ChunkIndex index = ZeroIndex; |
6885 | 2284 index < NumberOfInUseLists; |
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2285 index = next_chunk_index(index)) { |
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2286 for (Metachunk* curr = chunks_in_use(index); |
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2287 curr != NULL; |
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2288 curr = curr->next()) { |
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2289 out->print("%d) ", i++); |
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|
2290 curr->print_on(out); |
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|
2291 if (TraceMetadataChunkAllocation && Verbose) { |
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|
2292 block_freelists()->print_on(out); |
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|
2293 } |
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2294 curr_total += curr->word_size(); |
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2295 used += curr->used_word_size(); |
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|
2296 capacity += curr->capacity_word_size(); |
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|
2297 waste += curr->free_word_size() + curr->overhead();; |
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2298 } |
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|
2299 } |
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2300 |
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|
2301 size_t free = current_chunk() == NULL ? 0 : current_chunk()->free_word_size(); |
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2302 // Free space isn't wasted. |
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2303 waste -= free; |
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|
2304 |
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2305 out->print_cr("total of all chunks " SIZE_FORMAT " used " SIZE_FORMAT |
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2306 " free " SIZE_FORMAT " capacity " SIZE_FORMAT |
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2307 " waste " SIZE_FORMAT, curr_total, used, free, capacity, waste); |
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2308 } |
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|
2309 |
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|
2310 #ifndef PRODUCT |
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2311 void SpaceManager::mangle_freed_chunks() { |
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2312 for (ChunkIndex index = ZeroIndex; |
6885 | 2313 index < NumberOfInUseLists; |
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|
2314 index = next_chunk_index(index)) { |
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|
2315 for (Metachunk* curr = chunks_in_use(index); |
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2316 curr != NULL; |
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2317 curr = curr->next()) { |
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|
2318 curr->mangle(); |
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|
2319 } |
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|
2320 } |
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2321 } |
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2322 #endif // PRODUCT |
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2323 |
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|
2324 // MetaspaceAux |
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|
2325 |
6734 | 2326 size_t MetaspaceAux::used_in_bytes(Metaspace::MetadataType mdtype) { |
6730
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2327 size_t used = 0; |
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|
2328 ClassLoaderDataGraphMetaspaceIterator iter; |
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|
2329 while (iter.repeat()) { |
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|
2330 Metaspace* msp = iter.get_next(); |
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|
2331 // Sum allocation_total for each metaspace |
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|
2332 if (msp != NULL) { |
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|
2333 used += msp->used_words(mdtype); |
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|
2334 } |
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|
2335 } |
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|
2336 return used * BytesPerWord; |
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|
2337 } |
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|
2338 |
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|
2339 size_t MetaspaceAux::free_in_bytes(Metaspace::MetadataType mdtype) { |
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|
2340 size_t free = 0; |
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|
2341 ClassLoaderDataGraphMetaspaceIterator iter; |
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|
2342 while (iter.repeat()) { |
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|
2343 Metaspace* msp = iter.get_next(); |
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|
2344 if (msp != NULL) { |
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|
2345 free += msp->free_words(mdtype); |
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|
2346 } |
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|
2347 } |
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|
2348 return free * BytesPerWord; |
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|
2349 } |
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|
2350 |
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2351 size_t MetaspaceAux::capacity_in_bytes(Metaspace::MetadataType mdtype) { |
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|
2352 size_t capacity = free_chunks_total(mdtype); |
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|
2353 ClassLoaderDataGraphMetaspaceIterator iter; |
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|
2354 while (iter.repeat()) { |
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2355 Metaspace* msp = iter.get_next(); |
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|
2356 if (msp != NULL) { |
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|
2357 capacity += msp->capacity_words(mdtype); |
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|
2358 } |
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|
2359 } |
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|
2360 return capacity * BytesPerWord; |
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|
2361 } |
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|
2362 |
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|
2363 size_t MetaspaceAux::reserved_in_bytes(Metaspace::MetadataType mdtype) { |
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|
2364 size_t reserved = (mdtype == Metaspace::ClassType) ? |
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|
2365 Metaspace::class_space_list()->virtual_space_total() : |
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|
2366 Metaspace::space_list()->virtual_space_total(); |
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|
2367 return reserved * BytesPerWord; |
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|
2368 } |
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|
2369 |
7446
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|
2370 size_t MetaspaceAux::min_chunk_size() { return Metaspace::first_chunk_word_size(); } |
6725
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|
2371 |
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|
2372 size_t MetaspaceAux::free_chunks_total(Metaspace::MetadataType mdtype) { |
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|
2373 ChunkManager* chunk = (mdtype == Metaspace::ClassType) ? |
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|
2374 Metaspace::class_space_list()->chunk_manager() : |
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parents:
diff
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|
2375 Metaspace::space_list()->chunk_manager(); |
6969
6bc207d87e5d
7200229: NPG: possible performance issue exposed by closed/runtime/6559877/Test6559877.java
mgerdin
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6885
diff
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|
2376 chunk->slow_verify(); |
6725
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|
2377 return chunk->free_chunks_total(); |
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diff
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|
2378 } |
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|
2379 |
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|
2380 size_t MetaspaceAux::free_chunks_total_in_bytes(Metaspace::MetadataType mdtype) { |
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|
2381 return free_chunks_total(mdtype) * BytesPerWord; |
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|
2382 } |
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|
2383 |
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|
2384 void MetaspaceAux::print_metaspace_change(size_t prev_metadata_used) { |
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|
2385 gclog_or_tty->print(", [Metaspace:"); |
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|
2386 if (PrintGCDetails && Verbose) { |
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|
2387 gclog_or_tty->print(" " SIZE_FORMAT |
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|
2388 "->" SIZE_FORMAT |
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|
2389 "(" SIZE_FORMAT "/" SIZE_FORMAT ")", |
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|
2390 prev_metadata_used, |
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diff
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|
2391 used_in_bytes(), |
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diff
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|
2392 capacity_in_bytes(), |
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|
2393 reserved_in_bytes()); |
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diff
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|
2394 } else { |
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|
2395 gclog_or_tty->print(" " SIZE_FORMAT "K" |
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|
2396 "->" SIZE_FORMAT "K" |
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|
2397 "(" SIZE_FORMAT "K/" SIZE_FORMAT "K)", |
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parents:
diff
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|
2398 prev_metadata_used / K, |
da91efe96a93
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diff
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|
2399 used_in_bytes()/ K, |
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parents:
diff
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|
2400 capacity_in_bytes()/K, |
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6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
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|
2401 reserved_in_bytes()/ K); |
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parents:
diff
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|
2402 } |
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6964458: Reimplement class meta-data storage to use native memory
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parents:
diff
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|
2403 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
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|
2404 gclog_or_tty->print("]"); |
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6964458: Reimplement class meta-data storage to use native memory
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parents:
diff
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|
2405 } |
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6964458: Reimplement class meta-data storage to use native memory
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diff
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|
2406 |
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6964458: Reimplement class meta-data storage to use native memory
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parents:
diff
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|
2407 // This is printed when PrintGCDetails |
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diff
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|
2408 void MetaspaceAux::print_on(outputStream* out) { |
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6964458: Reimplement class meta-data storage to use native memory
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diff
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|
2409 Metaspace::MetadataType ct = Metaspace::ClassType; |
da91efe96a93
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diff
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|
2410 Metaspace::MetadataType nct = Metaspace::NonClassType; |
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6964458: Reimplement class meta-data storage to use native memory
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diff
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|
2411 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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diff
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|
2412 out->print_cr(" Metaspace total " |
da91efe96a93
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diff
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|
2413 SIZE_FORMAT "K, used " SIZE_FORMAT "K," |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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diff
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|
2414 " reserved " SIZE_FORMAT "K", |
6734 | 2415 capacity_in_bytes()/K, used_in_bytes()/K, reserved_in_bytes()/K); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
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|
2416 out->print_cr(" data space " |
da91efe96a93
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diff
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|
2417 SIZE_FORMAT "K, used " SIZE_FORMAT "K," |
da91efe96a93
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diff
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|
2418 " reserved " SIZE_FORMAT "K", |
6734 | 2419 capacity_in_bytes(nct)/K, used_in_bytes(nct)/K, reserved_in_bytes(nct)/K); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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parents:
diff
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|
2420 out->print_cr(" class space " |
da91efe96a93
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diff
changeset
|
2421 SIZE_FORMAT "K, used " SIZE_FORMAT "K," |
da91efe96a93
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diff
changeset
|
2422 " reserved " SIZE_FORMAT "K", |
6734 | 2423 capacity_in_bytes(ct)/K, used_in_bytes(ct)/K, reserved_in_bytes(ct)/K); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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parents:
diff
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|
2424 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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diff
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|
2425 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2426 // Print information for class space and data space separately. |
da91efe96a93
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coleenp
parents:
diff
changeset
|
2427 // This is almost the same as above. |
da91efe96a93
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diff
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|
2428 void MetaspaceAux::print_on(outputStream* out, Metaspace::MetadataType mdtype) { |
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6964458: Reimplement class meta-data storage to use native memory
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diff
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|
2429 size_t free_chunks_capacity_bytes = free_chunks_total_in_bytes(mdtype); |
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diff
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|
2430 size_t capacity_bytes = capacity_in_bytes(mdtype); |
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diff
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|
2431 size_t used_bytes = used_in_bytes(mdtype); |
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diff
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|
2432 size_t free_bytes = free_in_bytes(mdtype); |
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|
2433 size_t used_and_free = used_bytes + free_bytes + |
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diff
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|
2434 free_chunks_capacity_bytes; |
da91efe96a93
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diff
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|
2435 out->print_cr(" Chunk accounting: used in chunks " SIZE_FORMAT |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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parents:
diff
changeset
|
2436 "K + unused in chunks " SIZE_FORMAT "K + " |
da91efe96a93
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diff
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|
2437 " capacity in free chunks " SIZE_FORMAT "K = " SIZE_FORMAT |
da91efe96a93
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diff
changeset
|
2438 "K capacity in allocated chunks " SIZE_FORMAT "K", |
da91efe96a93
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coleenp
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diff
changeset
|
2439 used_bytes / K, |
da91efe96a93
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coleenp
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diff
changeset
|
2440 free_bytes / K, |
da91efe96a93
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diff
changeset
|
2441 free_chunks_capacity_bytes / K, |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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diff
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|
2442 used_and_free / K, |
da91efe96a93
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diff
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|
2443 capacity_bytes / K); |
8738
1c88b99a2b01
8009282: Assertion "assert(used_and_free == capacity_bytes) failed: Accounting is wrong" failed with -XX:+Verbose -XX:+TraceMetadataChunkAllocation
mgerdin
parents:
8040
diff
changeset
|
2444 // Accounting can only be correct if we got the values during a safepoint |
1c88b99a2b01
8009282: Assertion "assert(used_and_free == capacity_bytes) failed: Accounting is wrong" failed with -XX:+Verbose -XX:+TraceMetadataChunkAllocation
mgerdin
parents:
8040
diff
changeset
|
2445 assert(!SafepointSynchronize::is_at_safepoint() || used_and_free == capacity_bytes, "Accounting is wrong"); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
changeset
|
2446 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2447 |
da91efe96a93
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coleenp
parents:
diff
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|
2448 // Print total fragmentation for class and data metaspaces separately |
da91efe96a93
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|
2449 void MetaspaceAux::print_waste(outputStream* out) { |
da91efe96a93
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diff
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|
2450 |
7446
e51c9860cf66
8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
jmasa
parents:
7435
diff
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|
2451 size_t specialized_waste = 0, small_waste = 0, medium_waste = 0, large_waste = 0; |
e51c9860cf66
8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
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parents:
7435
diff
changeset
|
2452 size_t specialized_count = 0, small_count = 0, medium_count = 0, large_count = 0; |
e51c9860cf66
8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
jmasa
parents:
7435
diff
changeset
|
2453 size_t cls_specialized_waste = 0, cls_small_waste = 0, cls_medium_waste = 0, cls_large_waste = 0; |
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2454 size_t cls_specialized_count = 0, cls_small_count = 0, cls_medium_count = 0, cls_large_count = 0; |
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|
2455 |
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2456 ClassLoaderDataGraphMetaspaceIterator iter; |
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2457 while (iter.repeat()) { |
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2458 Metaspace* msp = iter.get_next(); |
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2459 if (msp != NULL) { |
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2460 specialized_waste += msp->vsm()->sum_waste_in_chunks_in_use(SpecializedIndex); |
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2461 specialized_count += msp->vsm()->sum_count_in_chunks_in_use(SpecializedIndex); |
6725
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2462 small_waste += msp->vsm()->sum_waste_in_chunks_in_use(SmallIndex); |
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2463 small_count += msp->vsm()->sum_count_in_chunks_in_use(SmallIndex); |
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2464 medium_waste += msp->vsm()->sum_waste_in_chunks_in_use(MediumIndex); |
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2465 medium_count += msp->vsm()->sum_count_in_chunks_in_use(MediumIndex); |
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2466 large_waste += msp->vsm()->sum_waste_in_chunks_in_use(HumongousIndex); |
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2467 large_count += msp->vsm()->sum_count_in_chunks_in_use(HumongousIndex); |
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2468 |
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2469 cls_specialized_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SpecializedIndex); |
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2470 cls_specialized_count += msp->class_vsm()->sum_count_in_chunks_in_use(SpecializedIndex); |
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2471 cls_small_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SmallIndex); |
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2472 cls_small_count += msp->class_vsm()->sum_count_in_chunks_in_use(SmallIndex); |
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2473 cls_medium_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(MediumIndex); |
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2474 cls_medium_count += msp->class_vsm()->sum_count_in_chunks_in_use(MediumIndex); |
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2475 cls_large_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(HumongousIndex); |
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2476 cls_large_count += msp->class_vsm()->sum_count_in_chunks_in_use(HumongousIndex); |
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|
2477 } |
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|
2478 } |
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2479 out->print_cr("Total fragmentation waste (words) doesn't count free space"); |
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2480 out->print_cr(" data: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", " |
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|
2481 SIZE_FORMAT " small(s) " SIZE_FORMAT ", " |
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2482 SIZE_FORMAT " medium(s) " SIZE_FORMAT, |
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2483 specialized_count, specialized_waste, small_count, |
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2484 small_waste, medium_count, medium_waste); |
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2485 out->print_cr(" class: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", " |
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2486 SIZE_FORMAT " small(s) " SIZE_FORMAT, |
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2487 cls_specialized_count, cls_specialized_waste, |
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2488 cls_small_count, cls_small_waste); |
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|
2489 } |
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|
2490 |
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2491 // Dump global metaspace things from the end of ClassLoaderDataGraph |
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|
2492 void MetaspaceAux::dump(outputStream* out) { |
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2493 out->print_cr("All Metaspace:"); |
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2494 out->print("data space: "); print_on(out, Metaspace::NonClassType); |
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2495 out->print("class space: "); print_on(out, Metaspace::ClassType); |
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|
2496 print_waste(out); |
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|
2497 } |
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|
2498 |
6969
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|
2499 void MetaspaceAux::verify_free_chunks() { |
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|
2500 Metaspace::space_list()->chunk_manager()->verify(); |
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|
2501 Metaspace::class_space_list()->chunk_manager()->verify(); |
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2502 } |
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|
2503 |
6725
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2504 // Metaspace methods |
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2505 |
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2506 size_t Metaspace::_first_chunk_word_size = 0; |
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2507 size_t Metaspace::_first_class_chunk_word_size = 0; |
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|
2508 |
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2509 Metaspace::Metaspace(Mutex* lock, MetaspaceType type) { |
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2510 initialize(lock, type); |
6725
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|
2511 } |
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|
2512 |
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2513 Metaspace::~Metaspace() { |
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|
2514 delete _vsm; |
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|
2515 delete _class_vsm; |
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|
2516 } |
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|
2517 |
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|
2518 VirtualSpaceList* Metaspace::_space_list = NULL; |
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2519 VirtualSpaceList* Metaspace::_class_space_list = NULL; |
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|
2520 |
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|
2521 #define VIRTUALSPACEMULTIPLIER 2 |
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|
2522 |
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|
2523 void Metaspace::global_initialize() { |
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diff
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|
2524 // Initialize the alignment for shared spaces. |
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|
2525 int max_alignment = os::vm_page_size(); |
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|
2526 MetaspaceShared::set_max_alignment(max_alignment); |
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|
2527 |
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|
2528 if (DumpSharedSpaces) { |
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|
2529 SharedReadOnlySize = align_size_up(SharedReadOnlySize, max_alignment); |
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|
2530 SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment); |
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|
2531 SharedMiscDataSize = align_size_up(SharedMiscDataSize, max_alignment); |
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|
2532 SharedMiscCodeSize = align_size_up(SharedMiscCodeSize, max_alignment); |
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|
2533 |
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|
2534 // Initialize with the sum of the shared space sizes. The read-only |
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diff
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|
2535 // and read write metaspace chunks will be allocated out of this and the |
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diff
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|
2536 // remainder is the misc code and data chunks. |
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|
2537 size_t total = align_size_up(SharedReadOnlySize + SharedReadWriteSize + |
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diff
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|
2538 SharedMiscDataSize + SharedMiscCodeSize, |
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|
2539 os::vm_allocation_granularity()); |
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diff
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|
2540 size_t word_size = total/wordSize; |
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|
2541 _space_list = new VirtualSpaceList(word_size); |
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|
2542 } else { |
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|
2543 // If using shared space, open the file that contains the shared space |
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|
2544 // and map in the memory before initializing the rest of metaspace (so |
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diff
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|
2545 // the addresses don't conflict) |
da91efe96a93
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diff
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|
2546 if (UseSharedSpaces) { |
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diff
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|
2547 FileMapInfo* mapinfo = new FileMapInfo(); |
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|
2548 memset(mapinfo, 0, sizeof(FileMapInfo)); |
da91efe96a93
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diff
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|
2549 |
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|
2550 // Open the shared archive file, read and validate the header. If |
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|
2551 // initialization fails, shared spaces [UseSharedSpaces] are |
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diff
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|
2552 // disabled and the file is closed. |
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diff
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|
2553 // Map in spaces now also |
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diff
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|
2554 if (mapinfo->initialize() && MetaspaceShared::map_shared_spaces(mapinfo)) { |
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diff
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|
2555 FileMapInfo::set_current_info(mapinfo); |
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diff
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|
2556 } else { |
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diff
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|
2557 assert(!mapinfo->is_open() && !UseSharedSpaces, |
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diff
changeset
|
2558 "archive file not closed or shared spaces not disabled."); |
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diff
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|
2559 } |
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diff
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|
2560 } |
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diff
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|
2561 |
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|
2562 // Initialize these before initializing the VirtualSpaceList |
6725
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diff
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|
2563 _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord; |
7446
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|
2564 _first_chunk_word_size = align_word_size_up(_first_chunk_word_size); |
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|
2565 // Make the first class chunk bigger than a medium chunk so it's not put |
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|
2566 // on the medium chunk list. The next chunk will be small and progress |
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|
2567 // from there. This size calculated by -version. |
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|
2568 _first_class_chunk_word_size = MIN2((size_t)MediumChunk*6, |
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|
2569 (ClassMetaspaceSize/BytesPerWord)*2); |
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|
2570 _first_class_chunk_word_size = align_word_size_up(_first_class_chunk_word_size); |
6725
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|
2571 // Arbitrarily set the initial virtual space to a multiple |
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2572 // of the boot class loader size. |
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2573 size_t word_size = VIRTUALSPACEMULTIPLIER * first_chunk_word_size(); |
6725
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2574 // Initialize the list of virtual spaces. |
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2575 _space_list = new VirtualSpaceList(word_size); |
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2576 } |
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|
2577 } |
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|
2578 |
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2579 // For UseCompressedKlassPointers the class space is reserved as a piece of the |
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2580 // Java heap because the compression algorithm is the same for each. The |
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2581 // argument passed in is at the top of the compressed space |
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2582 void Metaspace::initialize_class_space(ReservedSpace rs) { |
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2583 // The reserved space size may be bigger because of alignment, esp with UseLargePages |
8007
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2584 assert(rs.size() >= ClassMetaspaceSize, |
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2585 err_msg(SIZE_FORMAT " != " UINTX_FORMAT, rs.size(), ClassMetaspaceSize)); |
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2586 _class_space_list = new VirtualSpaceList(rs); |
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2587 } |
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2588 |
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2589 void Metaspace::initialize(Mutex* lock, |
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2590 MetaspaceType type) { |
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|
2591 |
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2592 assert(space_list() != NULL, |
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2593 "Metadata VirtualSpaceList has not been initialized"); |
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2594 |
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2595 _vsm = new SpaceManager(lock, space_list()); |
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2596 if (_vsm == NULL) { |
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2597 return; |
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2598 } |
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2599 size_t word_size; |
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2600 size_t class_word_size; |
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2601 vsm()->get_initial_chunk_sizes(type, |
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2602 &word_size, |
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2603 &class_word_size); |
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2604 |
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2605 assert(class_space_list() != NULL, |
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2606 "Class VirtualSpaceList has not been initialized"); |
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2607 |
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2608 // Allocate SpaceManager for classes. |
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2609 _class_vsm = new SpaceManager(lock, class_space_list()); |
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2610 if (_class_vsm == NULL) { |
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2611 return; |
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|
2612 } |
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2613 |
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2614 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag); |
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2615 |
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2616 // Allocate chunk for metadata objects |
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2617 Metachunk* new_chunk = |
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2618 space_list()->get_initialization_chunk(word_size, |
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2619 vsm()->medium_chunk_bunch()); |
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2620 assert(!DumpSharedSpaces || new_chunk != NULL, "should have enough space for both chunks"); |
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2621 if (new_chunk != NULL) { |
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2622 // Add to this manager's list of chunks in use and current_chunk(). |
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2623 vsm()->add_chunk(new_chunk, true); |
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2624 } |
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2625 |
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2626 // Allocate chunk for class metadata objects |
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2627 Metachunk* class_chunk = |
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2628 class_space_list()->get_initialization_chunk(class_word_size, |
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2629 class_vsm()->medium_chunk_bunch()); |
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2630 if (class_chunk != NULL) { |
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2631 class_vsm()->add_chunk(class_chunk, true); |
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2632 } |
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2633 } |
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2634 |
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2635 size_t Metaspace::align_word_size_up(size_t word_size) { |
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2636 size_t byte_size = word_size * wordSize; |
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2637 return ReservedSpace::allocation_align_size_up(byte_size) / wordSize; |
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2638 } |
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|
2639 |
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2640 MetaWord* Metaspace::allocate(size_t word_size, MetadataType mdtype) { |
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2641 // DumpSharedSpaces doesn't use class metadata area (yet) |
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2642 if (mdtype == ClassType && !DumpSharedSpaces) { |
6885 | 2643 return class_vsm()->allocate(word_size); |
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2644 } else { |
6885 | 2645 return vsm()->allocate(word_size); |
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2646 } |
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2647 } |
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2648 |
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2649 MetaWord* Metaspace::expand_and_allocate(size_t word_size, MetadataType mdtype) { |
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2650 MetaWord* result; |
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diff
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|
2651 MetaspaceGC::set_expand_after_GC(true); |
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|
2652 size_t before_inc = MetaspaceGC::capacity_until_GC(); |
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|
2653 size_t delta_words = MetaspaceGC::delta_capacity_until_GC(word_size); |
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|
2654 MetaspaceGC::inc_capacity_until_GC(delta_words); |
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2655 if (PrintGCDetails && Verbose) { |
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|
2656 gclog_or_tty->print_cr("Increase capacity to GC from " SIZE_FORMAT |
8da5e203b993
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|
2657 " to " SIZE_FORMAT, before_inc, MetaspaceGC::capacity_until_GC()); |
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|
2658 } |
6885 | 2659 |
6753
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|
2660 result = allocate(word_size, mdtype); |
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|
2661 |
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|
2662 return result; |
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|
2663 } |
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|
2664 |
6725
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2665 // Space allocated in the Metaspace. This may |
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2666 // be across several metadata virtual spaces. |
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|
2667 char* Metaspace::bottom() const { |
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2668 assert(DumpSharedSpaces, "only useful and valid for dumping shared spaces"); |
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2669 return (char*)vsm()->current_chunk()->bottom(); |
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|
2670 } |
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|
2671 |
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2672 size_t Metaspace::used_words(MetadataType mdtype) const { |
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2673 // return vsm()->allocation_total(); |
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2674 return mdtype == ClassType ? class_vsm()->sum_used_in_chunks_in_use() : |
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2675 vsm()->sum_used_in_chunks_in_use(); // includes overhead! |
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2676 } |
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2677 |
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2678 size_t Metaspace::free_words(MetadataType mdtype) const { |
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2679 return mdtype == ClassType ? class_vsm()->sum_free_in_chunks_in_use() : |
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2680 vsm()->sum_free_in_chunks_in_use(); |
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2681 } |
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|
2682 |
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2683 // Space capacity in the Metaspace. It includes |
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2684 // space in the list of chunks from which allocations |
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2685 // have been made. Don't include space in the global freelist and |
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|
2686 // in the space available in the dictionary which |
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|
2687 // is already counted in some chunk. |
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|
2688 size_t Metaspace::capacity_words(MetadataType mdtype) const { |
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2689 return mdtype == ClassType ? class_vsm()->sum_capacity_in_chunks_in_use() : |
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|
2690 vsm()->sum_capacity_in_chunks_in_use(); |
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|
2691 } |
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|
2692 |
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2693 void Metaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) { |
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2694 if (SafepointSynchronize::is_at_safepoint()) { |
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|
2695 assert(Thread::current()->is_VM_thread(), "should be the VM thread"); |
6885 | 2696 // Don't take Heap_lock |
2697 MutexLocker ml(vsm()->lock()); | |
2698 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) { | |
2699 // Dark matter. Too small for dictionary. | |
2700 #ifdef ASSERT | |
2701 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5); | |
2702 #endif | |
2703 return; | |
6725
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2704 } |
6885 | 2705 if (is_class) { |
2706 class_vsm()->deallocate(ptr, word_size); | |
2707 } else { | |
2708 vsm()->deallocate(ptr, word_size); | |
2709 } | |
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2710 } else { |
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2711 MutexLocker ml(vsm()->lock()); |
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2712 |
6885 | 2713 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) { |
2714 // Dark matter. Too small for dictionary. | |
2715 #ifdef ASSERT | |
2716 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5); | |
2717 #endif | |
2718 return; | |
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2719 } |
6885 | 2720 if (is_class) { |
2721 class_vsm()->deallocate(ptr, word_size); | |
2722 } else { | |
2723 vsm()->deallocate(ptr, word_size); | |
2724 } | |
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2725 } |
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2726 } |
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2727 |
6885 | 2728 Metablock* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size, |
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2729 bool read_only, MetadataType mdtype, TRAPS) { |
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2730 if (HAS_PENDING_EXCEPTION) { |
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2731 assert(false, "Should not allocate with exception pending"); |
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2732 return NULL; // caller does a CHECK_NULL too |
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2733 } |
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2734 |
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2735 // SSS: Should we align the allocations and make sure the sizes are aligned. |
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2736 MetaWord* result = NULL; |
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2737 |
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2738 assert(loader_data != NULL, "Should never pass around a NULL loader_data. " |
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2739 "ClassLoaderData::the_null_class_loader_data() should have been used."); |
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2740 // Allocate in metaspaces without taking out a lock, because it deadlocks |
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2741 // with the SymbolTable_lock. Dumping is single threaded for now. We'll have |
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2742 // to revisit this for application class data sharing. |
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2743 if (DumpSharedSpaces) { |
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2744 if (read_only) { |
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2745 result = loader_data->ro_metaspace()->allocate(word_size, NonClassType); |
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2746 } else { |
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2747 result = loader_data->rw_metaspace()->allocate(word_size, NonClassType); |
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2748 } |
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2749 if (result == NULL) { |
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2750 report_out_of_shared_space(read_only ? SharedReadOnly : SharedReadWrite); |
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2751 } |
6885 | 2752 return Metablock::initialize(result, word_size); |
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2753 } |
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2754 |
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2755 result = loader_data->metaspace_non_null()->allocate(word_size, mdtype); |
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2756 |
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2757 if (result == NULL) { |
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2758 // Try to clean out some memory and retry. |
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2759 result = |
6885 | 2760 Universe::heap()->collector_policy()->satisfy_failed_metadata_allocation( |
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2761 loader_data, word_size, mdtype); |
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2762 |
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2763 // If result is still null, we are out of memory. |
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2764 if (result == NULL) { |
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2765 if (Verbose && TraceMetadataChunkAllocation) { |
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2766 gclog_or_tty->print_cr("Metaspace allocation failed for size " |
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2767 SIZE_FORMAT, word_size); |
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2768 if (loader_data->metaspace_or_null() != NULL) loader_data->metaspace_or_null()->dump(gclog_or_tty); |
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2769 MetaspaceAux::dump(gclog_or_tty); |
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2770 } |
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2771 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support |
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2772 report_java_out_of_memory("Metadata space"); |
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2773 |
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2774 if (JvmtiExport::should_post_resource_exhausted()) { |
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2775 JvmtiExport::post_resource_exhausted( |
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2776 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR, |
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2777 "Metadata space"); |
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2778 } |
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2779 THROW_OOP_0(Universe::out_of_memory_error_perm_gen()); |
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2780 } |
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2781 } |
6885 | 2782 return Metablock::initialize(result, word_size); |
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2783 } |
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2784 |
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2785 void Metaspace::print_on(outputStream* out) const { |
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2786 // Print both class virtual space counts and metaspace. |
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2787 if (Verbose) { |
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2788 vsm()->print_on(out); |
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2789 class_vsm()->print_on(out); |
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2790 } |
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2791 } |
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2792 |
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2793 bool Metaspace::contains(const void * ptr) { |
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2794 if (MetaspaceShared::is_in_shared_space(ptr)) { |
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2795 return true; |
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2796 } |
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2797 // This is checked while unlocked. As long as the virtualspaces are added |
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2798 // at the end, the pointer will be in one of them. The virtual spaces |
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2799 // aren't deleted presently. When they are, some sort of locking might |
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2800 // be needed. Note, locking this can cause inversion problems with the |
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2801 // caller in MetaspaceObj::is_metadata() function. |
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2802 return space_list()->contains(ptr) || class_space_list()->contains(ptr); |
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2803 } |
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2804 |
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2805 void Metaspace::verify() { |
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2806 vsm()->verify(); |
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2807 class_vsm()->verify(); |
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2808 } |
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2809 |
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2810 void Metaspace::dump(outputStream* const out) const { |
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2811 if (UseMallocOnly) { |
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2812 // Just print usage for now |
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2813 out->print_cr("usage %d", used_words(Metaspace::NonClassType)); |
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2814 } |
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2815 out->print_cr("\nVirtual space manager: " INTPTR_FORMAT, vsm()); |
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2816 vsm()->dump(out); |
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2817 out->print_cr("\nClass space manager: " INTPTR_FORMAT, class_vsm()); |
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2818 class_vsm()->dump(out); |
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2819 } |