Mercurial > hg > truffle
annotate src/share/vm/memory/metaspace.cpp @ 6885:685df3c6f84b
7045397: NPG: Add freelists to class loader arenas.
Reviewed-by: coleenp, stefank, jprovino, ohair
author | jmasa |
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date | Tue, 18 Sep 2012 23:35:42 -0700 |
parents | 5baec2e69518 |
children | 6bc207d87e5d |
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1 /* |
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2 * Copyright (c) 2011, 2012, 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 "services/memTracker.hpp" |
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40 #include "utilities/copy.hpp" |
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41 #include "utilities/debug.hpp" |
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42 |
6885 | 43 typedef BinaryTreeDictionary<Metablock, FreeList> BlockTreeDictionary; |
44 typedef BinaryTreeDictionary<Metachunk, FreeList> ChunkTreeDictionary; | |
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45 |
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46 // Parameters for stress mode testing |
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47 const uint metadata_deallocate_a_lot_block = 10; |
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48 const uint metadata_deallocate_a_lock_chunk = 3; |
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49 size_t const allocation_from_dictionary_limit = 64 * K; |
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50 const size_t metadata_chunk_initialize = 0xf7f7f7f7; |
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51 const size_t metadata_deallocate = 0xf5f5f5f5; |
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52 |
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53 MetaWord* last_allocated = 0; |
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54 |
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55 // Used in declarations in SpaceManager and ChunkManager |
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56 enum ChunkIndex { |
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57 SmallIndex = 0, |
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58 MediumIndex = 1, |
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59 HumongousIndex = 2, |
6885 | 60 NumberOfFreeLists = 2, |
61 NumberOfInUseLists = 3 | |
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62 }; |
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63 |
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64 static ChunkIndex next_chunk_index(ChunkIndex i) { |
6885 | 65 assert(i < NumberOfInUseLists, "Out of bound"); |
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66 return (ChunkIndex) (i+1); |
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67 } |
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68 |
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69 // Originally _capacity_until_GC was set to MetaspaceSize here but |
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70 // the default MetaspaceSize before argument processing was being |
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71 // used which was not the desired value. See the code |
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72 // in should_expand() to see how the initialization is handled |
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73 // now. |
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74 size_t MetaspaceGC::_capacity_until_GC = 0; |
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75 bool MetaspaceGC::_expand_after_GC = false; |
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76 uint MetaspaceGC::_shrink_factor = 0; |
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77 bool MetaspaceGC::_should_concurrent_collect = false; |
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78 |
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79 // Blocks of space for metadata are allocated out of Metachunks. |
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80 // |
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81 // Metachunk are allocated out of MetadataVirtualspaces and once |
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82 // allocated there is no explicit link between a Metachunk and |
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83 // the MetadataVirtualspaces from which it was allocated. |
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84 // |
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85 // Each SpaceManager maintains a |
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86 // list of the chunks it is using and the current chunk. The current |
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87 // chunk is the chunk from which allocations are done. Space freed in |
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88 // a chunk is placed on the free list of blocks (BlockFreelist) and |
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89 // reused from there. |
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90 // |
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91 // Future modification |
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92 // |
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93 // The Metachunk can conceivable be replaced by the Chunk in |
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94 // allocation.hpp. Note that the latter Chunk is the space for |
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95 // allocation (allocations from the chunk are out of the space in |
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96 // the Chunk after the header for the Chunk) where as Metachunks |
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97 // point to space in a VirtualSpace. To replace Metachunks with |
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98 // Chunks, change Chunks so that they can be allocated out of a VirtualSpace. |
6885 | 99 size_t Metablock::_min_block_byte_size = sizeof(Metablock); |
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100 #ifdef ASSERT |
6885 | 101 size_t Metablock::_overhead = |
102 Chunk::aligned_overhead_size(sizeof(Metablock)) / BytesPerWord; | |
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103 #else |
6885 | 104 size_t Metablock::_overhead = 0; |
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105 #endif |
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106 |
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107 |
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108 // Pointer to list of Metachunks. |
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109 class ChunkList VALUE_OBJ_CLASS_SPEC { |
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110 // List of free chunks |
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111 Metachunk* _head; |
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112 |
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113 public: |
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114 // Constructor |
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115 ChunkList() : _head(NULL) {} |
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116 |
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117 // Accessors |
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118 Metachunk* head() { return _head; } |
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119 void set_head(Metachunk* v) { _head = v; } |
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120 |
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121 // Link at head of the list |
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122 void add_at_head(Metachunk* head, Metachunk* tail); |
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123 void add_at_head(Metachunk* head); |
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124 |
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125 size_t sum_list_size(); |
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126 size_t sum_list_count(); |
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127 size_t sum_list_capacity(); |
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128 }; |
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129 |
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130 // Manages the global free lists of chunks. |
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131 // Has three lists of free chunks, and a total size and |
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132 // count that includes all three |
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133 |
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134 class ChunkManager VALUE_OBJ_CLASS_SPEC { |
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135 |
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136 // Free list of chunks of different sizes. |
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137 // SmallChunk |
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138 // MediumChunk |
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139 // HumongousChunk |
6885 | 140 ChunkList _free_chunks[NumberOfFreeLists]; |
141 | |
142 // HumongousChunk | |
143 ChunkTreeDictionary _humongous_dictionary; | |
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144 |
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145 // ChunkManager in all lists of this type |
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146 size_t _free_chunks_total; |
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147 size_t _free_chunks_count; |
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148 |
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149 void dec_free_chunks_total(size_t v) { |
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150 assert(_free_chunks_count > 0 && |
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151 _free_chunks_total > 0, |
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152 "About to go negative"); |
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153 Atomic::add_ptr(-1, &_free_chunks_count); |
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154 jlong minus_v = (jlong) - (jlong) v; |
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155 Atomic::add_ptr(minus_v, &_free_chunks_total); |
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156 } |
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157 |
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158 // Debug support |
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159 |
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160 size_t sum_free_chunks(); |
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161 size_t sum_free_chunks_count(); |
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162 |
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163 void locked_verify_free_chunks_total(); |
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164 void locked_verify_free_chunks_count(); |
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165 void verify_free_chunks_count(); |
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166 |
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167 public: |
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168 |
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169 ChunkManager() : _free_chunks_total(0), _free_chunks_count(0) {} |
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170 |
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171 // add or delete (return) a chunk to the global freelist. |
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172 Metachunk* chunk_freelist_allocate(size_t word_size); |
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173 void chunk_freelist_deallocate(Metachunk* chunk); |
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174 |
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175 // Total of the space in the free chunks list |
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176 size_t free_chunks_total(); |
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177 size_t free_chunks_total_in_bytes(); |
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178 |
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179 // Number of chunks in the free chunks list |
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180 size_t free_chunks_count(); |
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181 |
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182 void inc_free_chunks_total(size_t v, size_t count = 1) { |
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183 Atomic::add_ptr(count, &_free_chunks_count); |
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184 Atomic::add_ptr(v, &_free_chunks_total); |
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185 } |
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186 ChunkList* free_medium_chunks() { return &_free_chunks[1]; } |
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187 ChunkList* free_small_chunks() { return &_free_chunks[0]; } |
6885 | 188 ChunkTreeDictionary* humongous_dictionary() { |
189 return &_humongous_dictionary; | |
190 } | |
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191 |
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192 ChunkList* free_chunks(ChunkIndex index); |
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193 |
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194 // Returns the list for the given chunk word size. |
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195 ChunkList* find_free_chunks_list(size_t word_size); |
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196 |
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197 // Add and remove from a list by size. Selects |
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198 // list based on size of chunk. |
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199 void free_chunks_put(Metachunk* chuck); |
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200 Metachunk* free_chunks_get(size_t chunk_word_size); |
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201 |
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202 // Debug support |
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203 void verify(); |
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204 void locked_verify(); |
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205 void verify_free_chunks_total(); |
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206 |
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207 void locked_print_free_chunks(outputStream* st); |
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208 void locked_print_sum_free_chunks(outputStream* st); |
6885 | 209 |
210 void print_on(outputStream* st); | |
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211 }; |
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212 |
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213 |
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214 // Used to manage the free list of Metablocks (a block corresponds |
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215 // to the allocation of a quantum of metadata). |
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216 class BlockFreelist VALUE_OBJ_CLASS_SPEC { |
6885 | 217 BlockTreeDictionary* _dictionary; |
218 static Metablock* initialize_free_chunk(MetaWord* p, size_t word_size); | |
219 | |
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220 // Accessors |
6885 | 221 BlockTreeDictionary* dictionary() const { return _dictionary; } |
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222 |
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223 public: |
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224 BlockFreelist(); |
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225 ~BlockFreelist(); |
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226 |
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227 // Get and return a block to the free list |
6885 | 228 MetaWord* get_block(size_t word_size); |
229 void return_block(MetaWord* p, size_t word_size); | |
230 | |
231 size_t total_size() { | |
232 if (dictionary() == NULL) { | |
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233 return 0; |
6885 | 234 } else { |
235 return dictionary()->total_size(); | |
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236 } |
6885 | 237 } |
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238 |
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239 void print_on(outputStream* st) const; |
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240 }; |
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241 |
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242 class VirtualSpaceNode : public CHeapObj<mtClass> { |
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243 friend class VirtualSpaceList; |
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244 |
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245 // Link to next VirtualSpaceNode |
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246 VirtualSpaceNode* _next; |
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247 |
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248 // total in the VirtualSpace |
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249 MemRegion _reserved; |
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250 ReservedSpace _rs; |
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251 VirtualSpace _virtual_space; |
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252 MetaWord* _top; |
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253 |
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254 // Convenience functions for logical bottom and end |
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255 MetaWord* bottom() const { return (MetaWord*) _virtual_space.low(); } |
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256 MetaWord* end() const { return (MetaWord*) _virtual_space.high(); } |
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257 |
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258 // Convenience functions to access the _virtual_space |
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259 char* low() const { return virtual_space()->low(); } |
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260 char* high() const { return virtual_space()->high(); } |
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261 |
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262 public: |
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263 |
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264 VirtualSpaceNode(size_t byte_size); |
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265 VirtualSpaceNode(ReservedSpace rs) : _top(NULL), _next(NULL), _rs(rs) {} |
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266 ~VirtualSpaceNode(); |
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267 |
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268 // address of next available space in _virtual_space; |
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269 // Accessors |
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270 VirtualSpaceNode* next() { return _next; } |
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271 void set_next(VirtualSpaceNode* v) { _next = v; } |
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272 |
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273 void set_reserved(MemRegion const v) { _reserved = v; } |
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274 void set_top(MetaWord* v) { _top = v; } |
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275 |
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276 // Accessors |
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277 MemRegion* reserved() { return &_reserved; } |
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278 VirtualSpace* virtual_space() const { return (VirtualSpace*) &_virtual_space; } |
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279 |
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280 // Returns true if "word_size" is available in the virtual space |
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281 bool is_available(size_t word_size) { return _top + word_size <= end(); } |
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282 |
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283 MetaWord* top() const { return _top; } |
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284 void inc_top(size_t word_size) { _top += word_size; } |
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285 |
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286 // used and capacity in this single entry in the list |
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287 size_t used_words_in_vs() const; |
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288 size_t capacity_words_in_vs() const; |
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289 |
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290 bool initialize(); |
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291 |
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292 // get space from the virtual space |
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293 Metachunk* take_from_committed(size_t chunk_word_size); |
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294 |
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295 // Allocate a chunk from the virtual space and return it. |
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296 Metachunk* get_chunk_vs(size_t chunk_word_size); |
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297 Metachunk* get_chunk_vs_with_expand(size_t chunk_word_size); |
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298 |
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299 // Expands/shrinks the committed space in a virtual space. Delegates |
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300 // to Virtualspace |
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301 bool expand_by(size_t words, bool pre_touch = false); |
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302 bool shrink_by(size_t words); |
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303 |
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304 // Debug support |
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305 static void verify_virtual_space_total(); |
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306 static void verify_virtual_space_count(); |
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307 void mangle(); |
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308 |
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309 void print_on(outputStream* st) const; |
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310 }; |
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311 |
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312 // byte_size is the size of the associated virtualspace. |
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313 VirtualSpaceNode::VirtualSpaceNode(size_t byte_size) : _top(NULL), _next(NULL), _rs(0) { |
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314 // This allocates memory with mmap. For DumpSharedspaces, allocate the |
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315 // space at low memory so that other shared images don't conflict. |
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316 // This is the same address as memory needed for UseCompressedOops but |
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317 // compressed oops don't work with CDS (offsets in metadata are wrong), so |
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318 // borrow the same address. |
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319 if (DumpSharedSpaces) { |
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320 char* shared_base = (char*)HeapBaseMinAddress; |
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321 _rs = ReservedSpace(byte_size, 0, false, shared_base, 0); |
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322 if (_rs.is_reserved()) { |
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323 assert(_rs.base() == shared_base, "should match"); |
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324 } else { |
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325 // If we are dumping the heap, then allocate a wasted block of address |
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326 // space in order to push the heap to a lower address. This extra |
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327 // address range allows for other (or larger) libraries to be loaded |
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328 // without them occupying the space required for the shared spaces. |
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329 uintx reserved = 0; |
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330 uintx block_size = 64*1024*1024; |
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331 while (reserved < SharedDummyBlockSize) { |
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332 char* dummy = os::reserve_memory(block_size); |
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333 reserved += block_size; |
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334 } |
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335 _rs = ReservedSpace(byte_size); |
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336 } |
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337 MetaspaceShared::set_shared_rs(&_rs); |
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338 } else { |
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339 _rs = ReservedSpace(byte_size); |
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340 } |
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341 |
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342 MemTracker::record_virtual_memory_type((address)_rs.base(), mtClass); |
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343 } |
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344 |
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345 // List of VirtualSpaces for metadata allocation. |
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346 // It has a _next link for singly linked list and a MemRegion |
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347 // for total space in the VirtualSpace. |
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348 class VirtualSpaceList : public CHeapObj<mtClass> { |
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349 friend class VirtualSpaceNode; |
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350 |
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351 enum VirtualSpaceSizes { |
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352 VirtualSpaceSize = 256 * K |
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353 }; |
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354 |
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355 // Global list of virtual spaces |
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356 // Head of the list |
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357 VirtualSpaceNode* _virtual_space_list; |
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358 // virtual space currently being used for allocations |
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359 VirtualSpaceNode* _current_virtual_space; |
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360 // Free chunk list for all other metadata |
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361 ChunkManager _chunk_manager; |
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362 |
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363 // Can this virtual list allocate >1 spaces? Also, used to determine |
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364 // whether to allocate unlimited small chunks in this virtual space |
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365 bool _is_class; |
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366 bool can_grow() const { return !is_class() || !UseCompressedKlassPointers; } |
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367 |
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368 // Sum of space in all virtual spaces and number of virtual spaces |
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369 size_t _virtual_space_total; |
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370 size_t _virtual_space_count; |
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371 |
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372 ~VirtualSpaceList(); |
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373 |
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374 VirtualSpaceNode* virtual_space_list() const { return _virtual_space_list; } |
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375 |
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376 void set_virtual_space_list(VirtualSpaceNode* v) { |
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377 _virtual_space_list = v; |
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378 } |
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379 void set_current_virtual_space(VirtualSpaceNode* v) { |
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380 _current_virtual_space = v; |
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381 } |
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382 |
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383 void link_vs(VirtualSpaceNode* new_entry, size_t vs_word_size); |
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384 |
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385 // Get another virtual space and add it to the list. This |
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386 // is typically prompted by a failed attempt to allocate a chunk |
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387 // and is typically followed by the allocation of a chunk. |
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388 bool grow_vs(size_t vs_word_size); |
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389 |
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390 public: |
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391 VirtualSpaceList(size_t word_size); |
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392 VirtualSpaceList(ReservedSpace rs); |
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393 |
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394 Metachunk* get_new_chunk(size_t word_size, size_t grow_chunks_by_words); |
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395 |
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396 VirtualSpaceNode* current_virtual_space() { |
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397 return _current_virtual_space; |
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398 } |
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399 |
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400 ChunkManager* chunk_manager() { return &_chunk_manager; } |
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401 bool is_class() const { return _is_class; } |
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402 |
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403 // Allocate the first virtualspace. |
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404 void initialize(size_t word_size); |
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405 |
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406 size_t virtual_space_total() { return _virtual_space_total; } |
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407 void inc_virtual_space_total(size_t v) { |
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408 Atomic::add_ptr(v, &_virtual_space_total); |
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409 } |
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410 |
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411 size_t virtual_space_count() { return _virtual_space_count; } |
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412 void inc_virtual_space_count() { |
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413 Atomic::inc_ptr(&_virtual_space_count); |
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414 } |
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415 |
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416 // Used and capacity in the entire list of virtual spaces. |
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417 // These are global values shared by all Metaspaces |
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418 size_t capacity_words_sum(); |
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419 size_t capacity_bytes_sum() { return capacity_words_sum() * BytesPerWord; } |
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420 size_t used_words_sum(); |
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421 size_t used_bytes_sum() { return used_words_sum() * BytesPerWord; } |
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422 |
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423 bool contains(const void *ptr); |
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424 |
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425 void print_on(outputStream* st) const; |
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426 |
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427 class VirtualSpaceListIterator : public StackObj { |
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428 VirtualSpaceNode* _virtual_spaces; |
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429 public: |
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430 VirtualSpaceListIterator(VirtualSpaceNode* virtual_spaces) : |
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431 _virtual_spaces(virtual_spaces) {} |
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432 |
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433 bool repeat() { |
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434 return _virtual_spaces != NULL; |
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435 } |
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436 |
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437 VirtualSpaceNode* get_next() { |
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438 VirtualSpaceNode* result = _virtual_spaces; |
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439 if (_virtual_spaces != NULL) { |
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440 _virtual_spaces = _virtual_spaces->next(); |
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441 } |
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442 return result; |
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443 } |
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444 }; |
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445 }; |
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446 |
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447 class Metadebug : AllStatic { |
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448 // Debugging support for Metaspaces |
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449 static int _deallocate_block_a_lot_count; |
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450 static int _deallocate_chunk_a_lot_count; |
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451 static int _allocation_fail_alot_count; |
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452 |
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453 public: |
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454 static int deallocate_block_a_lot_count() { |
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455 return _deallocate_block_a_lot_count; |
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456 } |
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457 static void set_deallocate_block_a_lot_count(int v) { |
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458 _deallocate_block_a_lot_count = v; |
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459 } |
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460 static void inc_deallocate_block_a_lot_count() { |
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461 _deallocate_block_a_lot_count++; |
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462 } |
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463 static int deallocate_chunk_a_lot_count() { |
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464 return _deallocate_chunk_a_lot_count; |
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465 } |
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466 static void reset_deallocate_chunk_a_lot_count() { |
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467 _deallocate_chunk_a_lot_count = 1; |
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468 } |
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469 static void inc_deallocate_chunk_a_lot_count() { |
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470 _deallocate_chunk_a_lot_count++; |
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471 } |
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472 |
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473 static void init_allocation_fail_alot_count(); |
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474 #ifdef ASSERT |
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475 static bool test_metadata_failure(); |
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476 #endif |
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477 |
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478 static void deallocate_chunk_a_lot(SpaceManager* sm, |
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479 size_t chunk_word_size); |
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480 static void deallocate_block_a_lot(SpaceManager* sm, |
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481 size_t chunk_word_size); |
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482 |
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483 }; |
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484 |
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485 int Metadebug::_deallocate_block_a_lot_count = 0; |
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486 int Metadebug::_deallocate_chunk_a_lot_count = 0; |
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487 int Metadebug::_allocation_fail_alot_count = 0; |
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488 |
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489 // SpaceManager - used by Metaspace to handle allocations |
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490 class SpaceManager : public CHeapObj<mtClass> { |
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491 friend class Metaspace; |
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492 friend class Metadebug; |
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493 |
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494 private: |
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495 // protects allocations and contains. |
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496 Mutex* const _lock; |
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497 |
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498 // List of chunks in use by this SpaceManager. Allocations |
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499 // are done from the current chunk. The list is used for deallocating |
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500 // chunks when the SpaceManager is freed. |
6885 | 501 Metachunk* _chunks_in_use[NumberOfInUseLists]; |
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502 Metachunk* _current_chunk; |
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503 |
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504 // Virtual space where allocation comes from. |
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505 VirtualSpaceList* _vs_list; |
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506 |
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507 // Number of small chunks to allocate to a manager |
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508 // If class space manager, small chunks are unlimited |
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509 static uint const _small_chunk_limit; |
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510 bool has_small_chunk_limit() { return !vs_list()->is_class(); } |
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511 |
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512 // Sum of all space in allocated chunks |
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513 size_t _allocation_total; |
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514 |
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515 // Free lists of blocks are per SpaceManager since they |
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516 // are assumed to be in chunks in use by the SpaceManager |
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517 // and all chunks in use by a SpaceManager are freed when |
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518 // the class loader using the SpaceManager is collected. |
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519 BlockFreelist _block_freelists; |
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520 |
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521 // protects virtualspace and chunk expansions |
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522 static const char* _expand_lock_name; |
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523 static const int _expand_lock_rank; |
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524 static Mutex* const _expand_lock; |
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525 |
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526 // Accessors |
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527 Metachunk* chunks_in_use(ChunkIndex index) const { return _chunks_in_use[index]; } |
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528 void set_chunks_in_use(ChunkIndex index, Metachunk* v) { _chunks_in_use[index] = v; } |
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529 |
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530 BlockFreelist* block_freelists() const { |
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531 return (BlockFreelist*) &_block_freelists; |
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532 } |
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533 |
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534 VirtualSpaceList* vs_list() const { return _vs_list; } |
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535 |
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536 Metachunk* current_chunk() const { return _current_chunk; } |
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537 void set_current_chunk(Metachunk* v) { |
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538 _current_chunk = v; |
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539 } |
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540 |
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541 Metachunk* find_current_chunk(size_t word_size); |
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542 |
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543 // Add chunk to the list of chunks in use |
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544 void add_chunk(Metachunk* v, bool make_current); |
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545 |
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546 Mutex* lock() const { return _lock; } |
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547 |
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548 public: |
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549 SpaceManager(Mutex* lock, VirtualSpaceList* vs_list); |
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550 ~SpaceManager(); |
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551 |
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552 enum ChunkSizes { // in words. |
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553 SmallChunk = 512, |
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554 MediumChunk = 8 * K, |
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555 MediumChunkBunch = 4 * MediumChunk |
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556 }; |
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557 |
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558 // Accessors |
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559 size_t allocation_total() const { return _allocation_total; } |
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560 void inc_allocation_total(size_t v) { Atomic::add_ptr(v, &_allocation_total); } |
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561 static bool is_humongous(size_t word_size) { return word_size > MediumChunk; } |
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562 |
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563 static Mutex* expand_lock() { return _expand_lock; } |
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564 |
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565 size_t sum_capacity_in_chunks_in_use() const; |
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566 size_t sum_used_in_chunks_in_use() const; |
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567 size_t sum_free_in_chunks_in_use() const; |
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568 size_t sum_waste_in_chunks_in_use() const; |
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569 size_t sum_waste_in_chunks_in_use(ChunkIndex index ) const; |
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570 |
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571 size_t sum_count_in_chunks_in_use(); |
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572 size_t sum_count_in_chunks_in_use(ChunkIndex i); |
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573 |
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574 // Block allocation and deallocation. |
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575 // Allocates a block from the current chunk |
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576 MetaWord* allocate(size_t word_size); |
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577 |
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578 // Helper for allocations |
6885 | 579 MetaWord* allocate_work(size_t word_size); |
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580 |
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581 // Returns a block to the per manager freelist |
6885 | 582 void deallocate(MetaWord* p, size_t word_size); |
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583 |
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584 // Based on the allocation size and a minimum chunk size, |
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585 // returned chunk size (for expanding space for chunk allocation). |
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586 size_t calc_chunk_size(size_t allocation_word_size); |
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587 |
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588 // Called when an allocation from the current chunk fails. |
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589 // Gets a new chunk (may require getting a new virtual space), |
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590 // and allocates from that chunk. |
6885 | 591 MetaWord* grow_and_allocate(size_t word_size); |
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592 |
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593 // debugging support. |
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594 |
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595 void dump(outputStream* const out) const; |
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596 void print_on(outputStream* st) const; |
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597 void locked_print_chunks_in_use_on(outputStream* st) const; |
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598 |
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599 void verify(); |
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600 #ifdef ASSERT |
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601 void mangle_freed_chunks(); |
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602 void verify_allocation_total(); |
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603 #endif |
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604 }; |
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605 |
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606 uint const SpaceManager::_small_chunk_limit = 4; |
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607 |
6885 | 608 |
609 | |
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610 const char* SpaceManager::_expand_lock_name = |
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611 "SpaceManager chunk allocation lock"; |
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612 const int SpaceManager::_expand_lock_rank = Monitor::leaf - 1; |
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613 Mutex* const SpaceManager::_expand_lock = |
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614 new Mutex(SpaceManager::_expand_lock_rank, |
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615 SpaceManager::_expand_lock_name, |
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616 Mutex::_allow_vm_block_flag); |
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617 |
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618 size_t Metachunk::_overhead = |
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619 Chunk::aligned_overhead_size(sizeof(Metachunk)) / BytesPerWord; |
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620 |
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621 // New blocks returned by the Metaspace are zero initialized. |
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622 // We should fix the constructors to not assume this instead. |
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623 Metablock* Metablock::initialize(MetaWord* p, size_t word_size) { |
6885 | 624 if (p == NULL) { |
625 return NULL; | |
626 } | |
627 | |
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628 Metablock* result = (Metablock*) p; |
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629 |
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630 // Clear the memory |
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631 Copy::fill_to_aligned_words((HeapWord*)result, word_size); |
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632 #ifdef ASSERT |
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633 result->set_word_size(word_size); |
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634 #endif |
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635 return result; |
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636 } |
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637 |
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638 // Metachunk methods |
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639 |
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640 Metachunk* Metachunk::initialize(MetaWord* ptr, size_t word_size) { |
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641 // Set bottom, top, and end. Allow space for the Metachunk itself |
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642 Metachunk* chunk = (Metachunk*) ptr; |
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643 |
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644 MetaWord* chunk_bottom = ptr + _overhead; |
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645 chunk->set_bottom(ptr); |
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646 chunk->set_top(chunk_bottom); |
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647 MetaWord* chunk_end = ptr + word_size; |
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648 assert(chunk_end > chunk_bottom, "Chunk must be too small"); |
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649 chunk->set_end(chunk_end); |
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650 chunk->set_next(NULL); |
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651 chunk->set_word_size(word_size); |
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652 #ifdef ASSERT |
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653 size_t data_word_size = pointer_delta(chunk_end, chunk_bottom, sizeof(MetaWord)); |
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654 Copy::fill_to_words((HeapWord*) chunk_bottom, data_word_size, metadata_chunk_initialize); |
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655 #endif |
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656 return chunk; |
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657 } |
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658 |
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659 |
6885 | 660 MetaWord* Metachunk::allocate(size_t word_size) { |
661 MetaWord* result = NULL; | |
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662 // If available, bump the pointer to allocate. |
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663 if (free_word_size() >= word_size) { |
6885 | 664 result = _top; |
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665 _top = _top + word_size; |
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666 } |
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667 return result; |
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668 } |
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669 |
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670 // _bottom points to the start of the chunk including the overhead. |
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671 size_t Metachunk::used_word_size() { |
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672 return pointer_delta(_top, _bottom, sizeof(MetaWord)); |
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673 } |
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674 |
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675 size_t Metachunk::free_word_size() { |
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676 return pointer_delta(_end, _top, sizeof(MetaWord)); |
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677 } |
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678 |
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679 size_t Metachunk::capacity_word_size() { |
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680 return pointer_delta(_end, _bottom, sizeof(MetaWord)); |
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681 } |
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682 |
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683 void Metachunk::print_on(outputStream* st) const { |
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684 st->print_cr("Metachunk:" |
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685 " bottom " PTR_FORMAT " top " PTR_FORMAT |
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686 " end " PTR_FORMAT " size " SIZE_FORMAT, |
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687 bottom(), top(), end(), word_size()); |
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688 } |
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689 |
6885 | 690 #ifdef ASSERT |
691 void Metachunk::mangle() { | |
692 // Mangle the payload of the chunk and not the links that | |
693 // maintain list of chunks. | |
694 HeapWord* start = (HeapWord*)(bottom() + overhead()); | |
695 size_t word_size = capacity_word_size() - overhead(); | |
696 Copy::fill_to_words(start, word_size, metadata_chunk_initialize); | |
697 } | |
698 #endif // ASSERT | |
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699 |
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700 void Metachunk::verify() { |
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701 #ifdef ASSERT |
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702 // Cannot walk through the blocks unless the blocks have |
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703 // headers with sizes. |
6885 | 704 assert(_bottom <= _top && |
705 _top <= _end, | |
706 "Chunk has been smashed"); | |
707 assert(SpaceManager::is_humongous(_word_size) || | |
708 _word_size == SpaceManager::MediumChunk || | |
709 _word_size == SpaceManager::SmallChunk, | |
710 "Chunk size is wrong"); | |
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711 #endif |
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712 return; |
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713 } |
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714 |
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715 // BlockFreelist methods |
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716 |
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717 BlockFreelist::BlockFreelist() : _dictionary(NULL) {} |
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718 |
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719 BlockFreelist::~BlockFreelist() { |
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720 if (_dictionary != NULL) { |
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721 if (Verbose && TraceMetadataChunkAllocation) { |
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722 _dictionary->print_free_lists(gclog_or_tty); |
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723 } |
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724 delete _dictionary; |
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725 } |
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726 } |
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727 |
6885 | 728 Metablock* BlockFreelist::initialize_free_chunk(MetaWord* p, size_t word_size) { |
729 Metablock* block = (Metablock*) p; | |
730 block->set_word_size(word_size); | |
731 block->set_prev(NULL); | |
732 block->set_next(NULL); | |
733 | |
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734 return block; |
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735 } |
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736 |
6885 | 737 void BlockFreelist::return_block(MetaWord* p, size_t word_size) { |
738 Metablock* free_chunk = initialize_free_chunk(p, word_size); | |
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739 if (dictionary() == NULL) { |
6885 | 740 _dictionary = new BlockTreeDictionary(); |
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741 } |
6885 | 742 dictionary()->return_chunk(free_chunk); |
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743 } |
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744 |
6885 | 745 MetaWord* BlockFreelist::get_block(size_t word_size) { |
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746 if (dictionary() == NULL) { |
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747 return NULL; |
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748 } |
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749 |
6885 | 750 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) { |
751 // Dark matter. Too small for dictionary. | |
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752 return NULL; |
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753 } |
6885 | 754 |
755 Metablock* free_block = | |
756 dictionary()->get_chunk(word_size, FreeBlockDictionary<Metablock>::exactly); | |
757 if (free_block == NULL) { | |
758 return NULL; | |
759 } | |
760 | |
761 return (MetaWord*) free_block; | |
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762 } |
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763 |
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764 void BlockFreelist::print_on(outputStream* st) const { |
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765 if (dictionary() == NULL) { |
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766 return; |
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767 } |
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768 dictionary()->print_free_lists(st); |
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769 } |
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770 |
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771 // VirtualSpaceNode methods |
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772 |
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773 VirtualSpaceNode::~VirtualSpaceNode() { |
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774 _rs.release(); |
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775 } |
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776 |
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777 size_t VirtualSpaceNode::used_words_in_vs() const { |
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778 return pointer_delta(top(), bottom(), sizeof(MetaWord)); |
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779 } |
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780 |
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781 // Space committed in the VirtualSpace |
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782 size_t VirtualSpaceNode::capacity_words_in_vs() const { |
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783 return pointer_delta(end(), bottom(), sizeof(MetaWord)); |
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784 } |
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785 |
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786 |
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787 // Allocates the chunk from the virtual space only. |
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788 // This interface is also used internally for debugging. Not all |
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789 // chunks removed here are necessarily used for allocation. |
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790 Metachunk* VirtualSpaceNode::take_from_committed(size_t chunk_word_size) { |
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791 // Bottom of the new chunk |
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792 MetaWord* chunk_limit = top(); |
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793 assert(chunk_limit != NULL, "Not safe to call this method"); |
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794 |
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795 if (!is_available(chunk_word_size)) { |
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796 if (TraceMetadataChunkAllocation) { |
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797 tty->print("VirtualSpaceNode::take_from_committed() not available %d words ", chunk_word_size); |
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798 // Dump some information about the virtual space that is nearly full |
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799 print_on(tty); |
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800 } |
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801 return NULL; |
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802 } |
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803 |
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804 // Take the space (bump top on the current virtual space). |
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805 inc_top(chunk_word_size); |
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806 |
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807 // Point the chunk at the space |
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808 Metachunk* result = Metachunk::initialize(chunk_limit, chunk_word_size); |
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809 return result; |
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810 } |
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811 |
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812 |
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813 // Expand the virtual space (commit more of the reserved space) |
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814 bool VirtualSpaceNode::expand_by(size_t words, bool pre_touch) { |
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815 size_t bytes = words * BytesPerWord; |
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816 bool result = virtual_space()->expand_by(bytes, pre_touch); |
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817 if (TraceMetavirtualspaceAllocation && !result) { |
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818 gclog_or_tty->print_cr("VirtualSpaceNode::expand_by() failed " |
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819 "for byte size " SIZE_FORMAT, bytes); |
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820 virtual_space()->print(); |
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821 } |
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822 return result; |
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823 } |
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824 |
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825 // Shrink the virtual space (commit more of the reserved space) |
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826 bool VirtualSpaceNode::shrink_by(size_t words) { |
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827 size_t bytes = words * BytesPerWord; |
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828 virtual_space()->shrink_by(bytes); |
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829 return true; |
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830 } |
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831 |
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832 // Add another chunk to the chunk list. |
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833 |
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834 Metachunk* VirtualSpaceNode::get_chunk_vs(size_t chunk_word_size) { |
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835 assert_lock_strong(SpaceManager::expand_lock()); |
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836 Metachunk* result = NULL; |
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837 |
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838 return take_from_committed(chunk_word_size); |
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839 } |
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840 |
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841 Metachunk* VirtualSpaceNode::get_chunk_vs_with_expand(size_t chunk_word_size) { |
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842 assert_lock_strong(SpaceManager::expand_lock()); |
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843 |
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844 Metachunk* new_chunk = get_chunk_vs(chunk_word_size); |
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845 |
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846 if (new_chunk == NULL) { |
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847 // Only a small part of the virtualspace is committed when first |
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848 // allocated so committing more here can be expected. |
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849 size_t page_size_words = os::vm_page_size() / BytesPerWord; |
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850 size_t aligned_expand_vs_by_words = align_size_up(chunk_word_size, |
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851 page_size_words); |
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852 expand_by(aligned_expand_vs_by_words, false); |
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853 new_chunk = get_chunk_vs(chunk_word_size); |
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854 } |
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855 return new_chunk; |
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856 } |
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857 |
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858 bool VirtualSpaceNode::initialize() { |
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859 |
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860 if (!_rs.is_reserved()) { |
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861 return false; |
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862 } |
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863 |
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864 // Commit only 1 page instead of the whole reserved space _rs.size() |
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865 size_t committed_byte_size = os::vm_page_size(); |
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866 bool result = virtual_space()->initialize(_rs, committed_byte_size); |
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867 if (result) { |
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868 set_top((MetaWord*)virtual_space()->low()); |
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869 set_reserved(MemRegion((HeapWord*)_rs.base(), |
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870 (HeapWord*)(_rs.base() + _rs.size()))); |
6726
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871 |
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872 assert(reserved()->start() == (HeapWord*) _rs.base(), |
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873 err_msg("Reserved start was not set properly " PTR_FORMAT |
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874 " != " PTR_FORMAT, reserved()->start(), _rs.base())); |
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875 assert(reserved()->word_size() == _rs.size() / BytesPerWord, |
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876 err_msg("Reserved size was not set properly " SIZE_FORMAT |
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877 " != " SIZE_FORMAT, reserved()->word_size(), |
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878 _rs.size() / BytesPerWord)); |
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879 } |
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880 |
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881 return result; |
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882 } |
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883 |
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884 void VirtualSpaceNode::print_on(outputStream* st) const { |
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885 size_t used = used_words_in_vs(); |
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886 size_t capacity = capacity_words_in_vs(); |
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887 VirtualSpace* vs = virtual_space(); |
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888 st->print_cr(" space @ " PTR_FORMAT " " SIZE_FORMAT "K, %3d%% used " |
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889 "[" PTR_FORMAT ", " PTR_FORMAT ", " |
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890 PTR_FORMAT ", " PTR_FORMAT ")", |
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891 vs, capacity / K, used * 100 / capacity, |
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892 bottom(), top(), end(), |
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893 vs->high_boundary()); |
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894 } |
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895 |
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896 void VirtualSpaceNode::mangle() { |
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897 size_t word_size = capacity_words_in_vs(); |
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898 Copy::fill_to_words((HeapWord*) low(), word_size, 0xf1f1f1f1); |
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899 } |
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900 |
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901 // VirtualSpaceList methods |
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902 // Space allocated from the VirtualSpace |
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903 |
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904 VirtualSpaceList::~VirtualSpaceList() { |
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905 VirtualSpaceListIterator iter(virtual_space_list()); |
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906 while (iter.repeat()) { |
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907 VirtualSpaceNode* vsl = iter.get_next(); |
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908 delete vsl; |
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909 } |
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910 } |
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911 |
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912 size_t VirtualSpaceList::used_words_sum() { |
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913 size_t allocated_by_vs = 0; |
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914 VirtualSpaceListIterator iter(virtual_space_list()); |
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915 while (iter.repeat()) { |
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916 VirtualSpaceNode* vsl = iter.get_next(); |
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917 // Sum used region [bottom, top) in each virtualspace |
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918 allocated_by_vs += vsl->used_words_in_vs(); |
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919 } |
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920 assert(allocated_by_vs >= chunk_manager()->free_chunks_total(), |
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921 err_msg("Total in free chunks " SIZE_FORMAT |
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922 " greater than total from virtual_spaces " SIZE_FORMAT, |
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923 allocated_by_vs, chunk_manager()->free_chunks_total())); |
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924 size_t used = |
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925 allocated_by_vs - chunk_manager()->free_chunks_total(); |
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926 return used; |
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927 } |
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928 |
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929 // Space available in all MetadataVirtualspaces allocated |
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930 // for metadata. This is the upper limit on the capacity |
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931 // of chunks allocated out of all the MetadataVirtualspaces. |
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932 size_t VirtualSpaceList::capacity_words_sum() { |
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933 size_t capacity = 0; |
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934 VirtualSpaceListIterator iter(virtual_space_list()); |
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935 while (iter.repeat()) { |
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936 VirtualSpaceNode* vsl = iter.get_next(); |
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937 capacity += vsl->capacity_words_in_vs(); |
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938 } |
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939 return capacity; |
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940 } |
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941 |
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942 VirtualSpaceList::VirtualSpaceList(size_t word_size ) : |
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943 _is_class(false), |
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944 _virtual_space_list(NULL), |
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945 _current_virtual_space(NULL), |
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946 _virtual_space_total(0), |
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947 _virtual_space_count(0) { |
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948 MutexLockerEx cl(SpaceManager::expand_lock(), |
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949 Mutex::_no_safepoint_check_flag); |
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950 bool initialization_succeeded = grow_vs(word_size); |
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951 |
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952 assert(initialization_succeeded, |
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953 " VirtualSpaceList initialization should not fail"); |
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954 } |
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955 |
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956 VirtualSpaceList::VirtualSpaceList(ReservedSpace rs) : |
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957 _is_class(true), |
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958 _virtual_space_list(NULL), |
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959 _current_virtual_space(NULL), |
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960 _virtual_space_total(0), |
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961 _virtual_space_count(0) { |
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962 MutexLockerEx cl(SpaceManager::expand_lock(), |
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963 Mutex::_no_safepoint_check_flag); |
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964 VirtualSpaceNode* class_entry = new VirtualSpaceNode(rs); |
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965 bool succeeded = class_entry->initialize(); |
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966 assert(succeeded, " VirtualSpaceList initialization should not fail"); |
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967 link_vs(class_entry, rs.size()/BytesPerWord); |
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968 } |
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969 |
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970 // Allocate another meta virtual space and add it to the list. |
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971 bool VirtualSpaceList::grow_vs(size_t vs_word_size) { |
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972 assert_lock_strong(SpaceManager::expand_lock()); |
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973 if (vs_word_size == 0) { |
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974 return false; |
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975 } |
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976 // Reserve the space |
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977 size_t vs_byte_size = vs_word_size * BytesPerWord; |
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978 assert(vs_byte_size % os::vm_page_size() == 0, "Not aligned"); |
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979 |
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980 // Allocate the meta virtual space and initialize it. |
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981 VirtualSpaceNode* new_entry = new VirtualSpaceNode(vs_byte_size); |
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982 if (!new_entry->initialize()) { |
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983 delete new_entry; |
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984 return false; |
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985 } else { |
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986 link_vs(new_entry, vs_word_size); |
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987 return true; |
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988 } |
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989 } |
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990 |
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991 void VirtualSpaceList::link_vs(VirtualSpaceNode* new_entry, size_t vs_word_size) { |
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992 if (virtual_space_list() == NULL) { |
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993 set_virtual_space_list(new_entry); |
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994 } else { |
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995 current_virtual_space()->set_next(new_entry); |
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996 } |
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997 set_current_virtual_space(new_entry); |
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998 inc_virtual_space_total(vs_word_size); |
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999 inc_virtual_space_count(); |
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1000 #ifdef ASSERT |
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1001 new_entry->mangle(); |
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1002 #endif |
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1003 if (TraceMetavirtualspaceAllocation && Verbose) { |
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1004 VirtualSpaceNode* vsl = current_virtual_space(); |
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1005 vsl->print_on(tty); |
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1006 } |
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1007 } |
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|
1008 |
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1009 Metachunk* VirtualSpaceList::get_new_chunk(size_t word_size, |
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1010 size_t grow_chunks_by_words) { |
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1011 |
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1012 // Get a chunk from the chunk freelist |
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1013 Metachunk* next = chunk_manager()->chunk_freelist_allocate(grow_chunks_by_words); |
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1014 |
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1015 // Allocate a chunk out of the current virtual space. |
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1016 if (next == NULL) { |
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1017 next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words); |
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1018 } |
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1019 |
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1020 if (next == NULL) { |
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1021 // Not enough room in current virtual space. Try to commit |
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1022 // more space. |
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1023 size_t expand_vs_by_words = MAX2((size_t)SpaceManager::MediumChunkBunch, |
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1024 grow_chunks_by_words); |
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1025 size_t page_size_words = os::vm_page_size() / BytesPerWord; |
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1026 size_t aligned_expand_vs_by_words = align_size_up(expand_vs_by_words, |
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1027 page_size_words); |
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1028 bool vs_expanded = |
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1029 current_virtual_space()->expand_by(aligned_expand_vs_by_words, false); |
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1030 if (!vs_expanded) { |
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1031 // Should the capacity of the metaspaces be expanded for |
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1032 // this allocation? If it's the virtual space for classes and is |
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1033 // being used for CompressedHeaders, don't allocate a new virtualspace. |
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1034 if (can_grow() && MetaspaceGC::should_expand(this, word_size)) { |
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1035 // Get another virtual space. |
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1036 size_t grow_vs_words = |
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1037 MAX2((size_t)VirtualSpaceSize, aligned_expand_vs_by_words); |
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1038 if (grow_vs(grow_vs_words)) { |
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1039 // Got it. It's on the list now. Get a chunk from it. |
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1040 next = current_virtual_space()->get_chunk_vs_with_expand(grow_chunks_by_words); |
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1041 } |
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1042 if (TraceMetadataHumongousAllocation && SpaceManager::is_humongous(word_size)) { |
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1043 gclog_or_tty->print_cr(" aligned_expand_vs_by_words " PTR_FORMAT, |
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1044 aligned_expand_vs_by_words); |
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1045 gclog_or_tty->print_cr(" grow_vs_words " PTR_FORMAT, |
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1046 grow_vs_words); |
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1047 } |
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1048 } else { |
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1049 // Allocation will fail and induce a GC |
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1050 if (TraceMetadataChunkAllocation && Verbose) { |
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1051 gclog_or_tty->print_cr("VirtualSpaceList::get_new_chunk():" |
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1052 " Fail instead of expand the metaspace"); |
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1053 } |
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1054 } |
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1055 } else { |
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1056 // The virtual space expanded, get a new chunk |
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1057 next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words); |
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1058 assert(next != NULL, "Just expanded, should succeed"); |
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1059 } |
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1060 } |
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1061 |
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1062 return next; |
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1063 } |
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1064 |
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1065 void VirtualSpaceList::print_on(outputStream* st) const { |
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1066 if (TraceMetadataChunkAllocation && Verbose) { |
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1067 VirtualSpaceListIterator iter(virtual_space_list()); |
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1068 while (iter.repeat()) { |
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1069 VirtualSpaceNode* node = iter.get_next(); |
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1070 node->print_on(st); |
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1071 } |
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1072 } |
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1073 } |
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1074 |
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1075 #ifndef PRODUCT |
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1076 bool VirtualSpaceList::contains(const void *ptr) { |
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1077 VirtualSpaceNode* list = virtual_space_list(); |
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1078 VirtualSpaceListIterator iter(list); |
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1079 while (iter.repeat()) { |
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1080 VirtualSpaceNode* node = iter.get_next(); |
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1081 if (node->reserved()->contains(ptr)) { |
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1082 return true; |
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1083 } |
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1084 } |
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1085 return false; |
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1086 } |
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1087 #endif // PRODUCT |
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1088 |
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1089 |
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1090 // MetaspaceGC methods |
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1091 |
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1092 // VM_CollectForMetadataAllocation is the vm operation used to GC. |
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1093 // Within the VM operation after the GC the attempt to allocate the metadata |
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1094 // should succeed. If the GC did not free enough space for the metaspace |
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1095 // allocation, the HWM is increased so that another virtualspace will be |
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1096 // allocated for the metadata. With perm gen the increase in the perm |
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1097 // gen had bounds, MinMetaspaceExpansion and MaxMetaspaceExpansion. The |
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1098 // metaspace policy uses those as the small and large steps for the HWM. |
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1099 // |
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1100 // After the GC the compute_new_size() for MetaspaceGC is called to |
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1101 // resize the capacity of the metaspaces. The current implementation |
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1102 // is based on the flags MinHeapFreeRatio and MaxHeapFreeRatio used |
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1103 // to resize the Java heap by some GC's. New flags can be implemented |
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1104 // if really needed. MinHeapFreeRatio is used to calculate how much |
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1105 // free space is desirable in the metaspace capacity to decide how much |
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1106 // to increase the HWM. MaxHeapFreeRatio is used to decide how much |
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1107 // free space is desirable in the metaspace capacity before decreasing |
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1108 // the HWM. |
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1109 |
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1110 // Calculate the amount to increase the high water mark (HWM). |
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1111 // Increase by a minimum amount (MinMetaspaceExpansion) so that |
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1112 // another expansion is not requested too soon. If that is not |
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1113 // enough to satisfy the allocation (i.e. big enough for a word_size |
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1114 // allocation), increase by MaxMetaspaceExpansion. If that is still |
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1115 // not enough, expand by the size of the allocation (word_size) plus |
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1116 // some. |
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1117 size_t MetaspaceGC::delta_capacity_until_GC(size_t word_size) { |
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1118 size_t before_inc = MetaspaceGC::capacity_until_GC(); |
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1119 size_t min_delta_words = MinMetaspaceExpansion / BytesPerWord; |
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1120 size_t max_delta_words = MaxMetaspaceExpansion / BytesPerWord; |
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1121 size_t page_size_words = os::vm_page_size() / BytesPerWord; |
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1122 size_t size_delta_words = align_size_up(word_size, page_size_words); |
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1123 size_t delta_words = MAX2(size_delta_words, min_delta_words); |
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1124 if (delta_words > min_delta_words) { |
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1125 // Don't want to hit the high water mark on the next |
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1126 // allocation so make the delta greater than just enough |
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1127 // for this allocation. |
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1128 delta_words = MAX2(delta_words, max_delta_words); |
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1129 if (delta_words > max_delta_words) { |
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1130 // This allocation is large but the next ones are probably not |
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1131 // so increase by the minimum. |
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1132 delta_words = delta_words + min_delta_words; |
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1133 } |
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1134 } |
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1135 return delta_words; |
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1136 } |
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1137 |
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1138 bool MetaspaceGC::should_expand(VirtualSpaceList* vsl, size_t word_size) { |
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1139 |
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1140 // Class virtual space should always be expanded. Call GC for the other |
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1141 // metadata virtual space. |
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1142 if (vsl == Metaspace::class_space_list()) return true; |
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1143 |
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1144 // If the user wants a limit, impose one. |
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1145 size_t max_metaspace_size_words = MaxMetaspaceSize / BytesPerWord; |
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1146 size_t metaspace_size_words = MetaspaceSize / BytesPerWord; |
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1147 if (!FLAG_IS_DEFAULT(MaxMetaspaceSize) && |
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1148 vsl->capacity_words_sum() >= max_metaspace_size_words) { |
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1149 return false; |
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1150 } |
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1151 |
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1152 // If this is part of an allocation after a GC, expand |
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1153 // unconditionally. |
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1154 if(MetaspaceGC::expand_after_GC()) { |
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1155 return true; |
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1156 } |
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1157 |
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1158 // If the capacity is below the minimum capacity, allow the |
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1159 // expansion. Also set the high-water-mark (capacity_until_GC) |
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1160 // to that minimum capacity so that a GC will not be induced |
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1161 // until that minimum capacity is exceeded. |
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1162 if (vsl->capacity_words_sum() < metaspace_size_words || |
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1163 capacity_until_GC() == 0) { |
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1164 set_capacity_until_GC(metaspace_size_words); |
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1165 return true; |
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1166 } else { |
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1167 if (vsl->capacity_words_sum() < capacity_until_GC()) { |
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1168 return true; |
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1169 } else { |
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1170 if (TraceMetadataChunkAllocation && Verbose) { |
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1171 gclog_or_tty->print_cr(" allocation request size " SIZE_FORMAT |
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1172 " capacity_until_GC " SIZE_FORMAT |
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1173 " capacity_words_sum " SIZE_FORMAT |
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1174 " used_words_sum " SIZE_FORMAT |
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1175 " free chunks " SIZE_FORMAT |
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1176 " free chunks count %d", |
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1177 word_size, |
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1178 capacity_until_GC(), |
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1179 vsl->capacity_words_sum(), |
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1180 vsl->used_words_sum(), |
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1181 vsl->chunk_manager()->free_chunks_total(), |
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1182 vsl->chunk_manager()->free_chunks_count()); |
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1183 } |
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1184 return false; |
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1185 } |
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1186 } |
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1187 } |
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1188 |
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1189 // Variables are in bytes |
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1190 |
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1191 void MetaspaceGC::compute_new_size() { |
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1192 assert(_shrink_factor <= 100, "invalid shrink factor"); |
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1193 uint current_shrink_factor = _shrink_factor; |
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1194 _shrink_factor = 0; |
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1195 |
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1196 VirtualSpaceList *vsl = Metaspace::space_list(); |
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1197 |
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1198 size_t capacity_after_gc = vsl->capacity_bytes_sum(); |
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1199 // Check to see if these two can be calculated without walking the CLDG |
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1200 size_t used_after_gc = vsl->used_bytes_sum(); |
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1201 size_t capacity_until_GC = vsl->capacity_bytes_sum(); |
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1202 size_t free_after_gc = capacity_until_GC - used_after_gc; |
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1203 |
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1204 const double minimum_free_percentage = MinHeapFreeRatio / 100.0; |
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1205 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
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1206 |
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1207 const double min_tmp = used_after_gc / maximum_used_percentage; |
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1208 size_t minimum_desired_capacity = |
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1209 (size_t)MIN2(min_tmp, double(max_uintx)); |
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1210 // Don't shrink less than the initial generation size |
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1211 minimum_desired_capacity = MAX2(minimum_desired_capacity, |
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1212 MetaspaceSize); |
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1213 |
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1214 if (PrintGCDetails && Verbose) { |
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1215 const double free_percentage = ((double)free_after_gc) / capacity_until_GC; |
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1216 gclog_or_tty->print_cr("\nMetaspaceGC::compute_new_size: "); |
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1217 gclog_or_tty->print_cr(" " |
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1218 " minimum_free_percentage: %6.2f" |
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1219 " maximum_used_percentage: %6.2f", |
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1220 minimum_free_percentage, |
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1221 maximum_used_percentage); |
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1222 double d_free_after_gc = free_after_gc / (double) K; |
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1223 gclog_or_tty->print_cr(" " |
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1224 " free_after_gc : %6.1fK" |
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1225 " used_after_gc : %6.1fK" |
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1226 " capacity_after_gc : %6.1fK" |
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1227 " metaspace HWM : %6.1fK", |
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1228 free_after_gc / (double) K, |
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1229 used_after_gc / (double) K, |
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1230 capacity_after_gc / (double) K, |
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1231 capacity_until_GC / (double) K); |
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1232 gclog_or_tty->print_cr(" " |
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1233 " free_percentage: %6.2f", |
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1234 free_percentage); |
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1235 } |
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1236 |
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1237 |
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1238 if (capacity_until_GC < minimum_desired_capacity) { |
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1239 // If we have less capacity below the metaspace HWM, then |
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1240 // increment the HWM. |
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1241 size_t expand_bytes = minimum_desired_capacity - capacity_until_GC; |
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1242 // Don't expand unless it's significant |
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1243 if (expand_bytes >= MinMetaspaceExpansion) { |
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1244 size_t expand_words = expand_bytes / BytesPerWord; |
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1245 MetaspaceGC::inc_capacity_until_GC(expand_words); |
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1246 } |
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1247 if (PrintGCDetails && Verbose) { |
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1248 size_t new_capacity_until_GC = MetaspaceGC::capacity_until_GC_in_bytes(); |
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1249 gclog_or_tty->print_cr(" expanding:" |
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1250 " minimum_desired_capacity: %6.1fK" |
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1251 " expand_words: %6.1fK" |
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1252 " MinMetaspaceExpansion: %6.1fK" |
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1253 " new metaspace HWM: %6.1fK", |
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1254 minimum_desired_capacity / (double) K, |
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1255 expand_bytes / (double) K, |
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1256 MinMetaspaceExpansion / (double) K, |
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1257 new_capacity_until_GC / (double) K); |
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1258 } |
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1259 return; |
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1260 } |
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1261 |
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1262 // No expansion, now see if we want to shrink |
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1263 size_t shrink_words = 0; |
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1264 // We would never want to shrink more than this |
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1265 size_t max_shrink_words = capacity_until_GC - minimum_desired_capacity; |
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1266 assert(max_shrink_words >= 0, err_msg("max_shrink_words " SIZE_FORMAT, |
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1267 max_shrink_words)); |
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1268 |
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1269 // Should shrinking be considered? |
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1270 if (MaxHeapFreeRatio < 100) { |
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1271 const double maximum_free_percentage = MaxHeapFreeRatio / 100.0; |
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1272 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
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1273 const double max_tmp = used_after_gc / minimum_used_percentage; |
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1274 size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(max_uintx)); |
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|
1275 maximum_desired_capacity = MAX2(maximum_desired_capacity, |
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1276 MetaspaceSize); |
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1277 if (PrintGC && Verbose) { |
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1278 gclog_or_tty->print_cr(" " |
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1279 " maximum_free_percentage: %6.2f" |
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1280 " minimum_used_percentage: %6.2f", |
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1281 maximum_free_percentage, |
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1282 minimum_used_percentage); |
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1283 gclog_or_tty->print_cr(" " |
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1284 " capacity_until_GC: %6.1fK" |
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1285 " minimum_desired_capacity: %6.1fK" |
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1286 " maximum_desired_capacity: %6.1fK", |
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1287 capacity_until_GC / (double) K, |
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1288 minimum_desired_capacity / (double) K, |
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|
1289 maximum_desired_capacity / (double) K); |
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diff
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|
1290 } |
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|
1291 |
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1292 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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1293 "sanity check"); |
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1294 |
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1295 if (capacity_until_GC > maximum_desired_capacity) { |
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1296 // Capacity too large, compute shrinking size |
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1297 shrink_words = capacity_until_GC - maximum_desired_capacity; |
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1298 // We don't want shrink all the way back to initSize if people call |
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1299 // System.gc(), because some programs do that between "phases" and then |
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1300 // we'd just have to grow the heap up again for the next phase. So we |
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1301 // damp the shrinking: 0% on the first call, 10% on the second call, 40% |
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1302 // on the third call, and 100% by the fourth call. But if we recompute |
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1303 // size without shrinking, it goes back to 0%. |
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1304 shrink_words = shrink_words / 100 * current_shrink_factor; |
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1305 assert(shrink_words <= max_shrink_words, |
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1306 err_msg("invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT, |
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1307 shrink_words, max_shrink_words)); |
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1308 if (current_shrink_factor == 0) { |
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1309 _shrink_factor = 10; |
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1310 } else { |
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1311 _shrink_factor = MIN2(current_shrink_factor * 4, (uint) 100); |
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1312 } |
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1313 if (PrintGCDetails && Verbose) { |
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1314 gclog_or_tty->print_cr(" " |
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|
1315 " shrinking:" |
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|
1316 " initSize: %.1fK" |
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1317 " maximum_desired_capacity: %.1fK", |
da91efe96a93
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|
1318 MetaspaceSize / (double) K, |
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1319 maximum_desired_capacity / (double) K); |
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1320 gclog_or_tty->print_cr(" " |
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|
1321 " shrink_words: %.1fK" |
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1322 " current_shrink_factor: %d" |
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coleenp
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1323 " new shrink factor: %d" |
da91efe96a93
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|
1324 " MinMetaspaceExpansion: %.1fK", |
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coleenp
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|
1325 shrink_words / (double) K, |
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|
1326 current_shrink_factor, |
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|
1327 _shrink_factor, |
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|
1328 MinMetaspaceExpansion / (double) K); |
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|
1329 } |
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|
1330 } |
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|
1331 } |
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1332 |
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|
1333 |
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1334 // Don't shrink unless it's significant |
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1335 if (shrink_words >= MinMetaspaceExpansion) { |
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1336 VirtualSpaceNode* csp = vsl->current_virtual_space(); |
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1337 size_t available_to_shrink = csp->capacity_words_in_vs() - |
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|
1338 csp->used_words_in_vs(); |
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1339 shrink_words = MIN2(shrink_words, available_to_shrink); |
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1340 csp->shrink_by(shrink_words); |
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1341 MetaspaceGC::dec_capacity_until_GC(shrink_words); |
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1342 if (PrintGCDetails && Verbose) { |
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|
1343 size_t new_capacity_until_GC = MetaspaceGC::capacity_until_GC_in_bytes(); |
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1344 gclog_or_tty->print_cr(" metaspace HWM: %.1fK", new_capacity_until_GC / (double) K); |
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1345 } |
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6964458: Reimplement class meta-data storage to use native memory
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|
1346 } |
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|
1347 assert(vsl->used_bytes_sum() == used_after_gc && |
da91efe96a93
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1348 used_after_gc <= vsl->capacity_bytes_sum(), |
da91efe96a93
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|
1349 "sanity check"); |
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1350 |
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|
1351 } |
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|
1352 |
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|
1353 // Metadebug methods |
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|
1354 |
da91efe96a93
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1355 void Metadebug::deallocate_chunk_a_lot(SpaceManager* sm, |
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|
1356 size_t chunk_word_size){ |
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|
1357 #ifdef ASSERT |
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1358 VirtualSpaceList* vsl = sm->vs_list(); |
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|
1359 if (MetaDataDeallocateALot && |
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|
1360 Metadebug::deallocate_chunk_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) { |
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1361 Metadebug::reset_deallocate_chunk_a_lot_count(); |
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1362 for (uint i = 0; i < metadata_deallocate_a_lock_chunk; i++) { |
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1363 Metachunk* dummy_chunk = vsl->current_virtual_space()->take_from_committed(chunk_word_size); |
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1364 if (dummy_chunk == NULL) { |
da91efe96a93
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|
1365 break; |
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parents:
diff
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|
1366 } |
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1367 vsl->chunk_manager()->chunk_freelist_deallocate(dummy_chunk); |
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1368 |
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1369 if (TraceMetadataChunkAllocation && Verbose) { |
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1370 gclog_or_tty->print("Metadebug::deallocate_chunk_a_lot: %d) ", |
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1371 sm->sum_count_in_chunks_in_use()); |
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|
1372 dummy_chunk->print_on(gclog_or_tty); |
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1373 gclog_or_tty->print_cr(" Free chunks total %d count %d", |
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1374 vsl->chunk_manager()->free_chunks_total(), |
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1375 vsl->chunk_manager()->free_chunks_count()); |
da91efe96a93
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1376 } |
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6964458: Reimplement class meta-data storage to use native memory
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|
1377 } |
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|
1378 } else { |
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1379 Metadebug::inc_deallocate_chunk_a_lot_count(); |
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1380 } |
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|
1381 #endif |
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|
1382 } |
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1383 |
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1384 void Metadebug::deallocate_block_a_lot(SpaceManager* sm, |
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1385 size_t raw_word_size){ |
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|
1386 #ifdef ASSERT |
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1387 if (MetaDataDeallocateALot && |
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1388 Metadebug::deallocate_block_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) { |
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1389 Metadebug::set_deallocate_block_a_lot_count(0); |
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1390 for (uint i = 0; i < metadata_deallocate_a_lot_block; i++) { |
6885 | 1391 MetaWord* dummy_block = sm->allocate_work(raw_word_size); |
6725
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1392 if (dummy_block == 0) { |
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1393 break; |
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|
1394 } |
6885 | 1395 sm->deallocate(dummy_block, raw_word_size); |
6725
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|
1396 } |
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1397 } else { |
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1398 Metadebug::inc_deallocate_block_a_lot_count(); |
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1399 } |
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1400 #endif |
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1401 } |
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1402 |
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1403 void Metadebug::init_allocation_fail_alot_count() { |
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1404 if (MetadataAllocationFailALot) { |
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1405 _allocation_fail_alot_count = |
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1406 1+(long)((double)MetadataAllocationFailALotInterval*os::random()/(max_jint+1.0)); |
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1407 } |
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|
1408 } |
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|
1409 |
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|
1410 #ifdef ASSERT |
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|
1411 bool Metadebug::test_metadata_failure() { |
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|
1412 if (MetadataAllocationFailALot && |
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|
1413 Threads::is_vm_complete()) { |
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|
1414 if (_allocation_fail_alot_count > 0) { |
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|
1415 _allocation_fail_alot_count--; |
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|
1416 } else { |
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1417 if (TraceMetadataChunkAllocation && Verbose) { |
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1418 gclog_or_tty->print_cr("Metadata allocation failing for " |
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|
1419 "MetadataAllocationFailALot"); |
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|
1420 } |
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|
1421 init_allocation_fail_alot_count(); |
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|
1422 return true; |
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|
1423 } |
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|
1424 } |
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1425 return false; |
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|
1426 } |
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|
1427 #endif |
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|
1428 |
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1429 // ChunkList methods |
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1430 |
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1431 size_t ChunkList::sum_list_size() { |
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1432 size_t result = 0; |
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1433 Metachunk* cur = head(); |
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1434 while (cur != NULL) { |
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1435 result += cur->word_size(); |
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1436 cur = cur->next(); |
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|
1437 } |
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1438 return result; |
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|
1439 } |
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|
1440 |
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1441 size_t ChunkList::sum_list_count() { |
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1442 size_t result = 0; |
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1443 Metachunk* cur = head(); |
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1444 while (cur != NULL) { |
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1445 result++; |
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1446 cur = cur->next(); |
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|
1447 } |
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|
1448 return result; |
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|
1449 } |
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|
1450 |
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1451 size_t ChunkList::sum_list_capacity() { |
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|
1452 size_t result = 0; |
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1453 Metachunk* cur = head(); |
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|
1454 while (cur != NULL) { |
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|
1455 result += cur->capacity_word_size(); |
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1456 cur = cur->next(); |
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|
1457 } |
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1458 return result; |
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|
1459 } |
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|
1460 |
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1461 void ChunkList::add_at_head(Metachunk* head, Metachunk* tail) { |
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1462 assert_lock_strong(SpaceManager::expand_lock()); |
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1463 assert(tail->next() == NULL, "Not the tail"); |
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|
1464 |
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1465 if (TraceMetadataChunkAllocation && Verbose) { |
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1466 tty->print("ChunkList::add_at_head: "); |
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1467 Metachunk* cur = head; |
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1468 while (cur != NULL) { |
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1469 tty->print(PTR_FORMAT " (" SIZE_FORMAT ") ", cur, cur->word_size()); |
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1470 cur = cur->next(); |
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1471 } |
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|
1472 tty->print_cr(""); |
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|
1473 } |
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|
1474 |
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1475 if (tail != NULL) { |
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1476 tail->set_next(_head); |
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|
1477 } |
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|
1478 set_head(head); |
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|
1479 } |
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|
1480 |
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1481 void ChunkList::add_at_head(Metachunk* list) { |
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1482 if (list == NULL) { |
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|
1483 // Nothing to add |
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|
1484 return; |
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|
1485 } |
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|
1486 assert_lock_strong(SpaceManager::expand_lock()); |
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1487 Metachunk* head = list; |
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|
1488 Metachunk* tail = list; |
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1489 Metachunk* cur = head->next(); |
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1490 // Search for the tail since it is not passed. |
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|
1491 while (cur != NULL) { |
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|
1492 tail = cur; |
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|
1493 cur = cur->next(); |
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|
1494 } |
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|
1495 add_at_head(head, tail); |
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|
1496 } |
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|
1497 |
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|
1498 // ChunkManager methods |
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|
1499 |
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1500 // Verification of _free_chunks_total and _free_chunks_count does not |
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1501 // work with the CMS collector because its use of additional locks |
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|
1502 // complicate the mutex deadlock detection but it can still be useful |
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|
1503 // for detecting errors in the chunk accounting with other collectors. |
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|
1504 |
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|
1505 size_t ChunkManager::free_chunks_total() { |
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|
1506 #ifdef ASSERT |
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|
1507 if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) { |
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|
1508 MutexLockerEx cl(SpaceManager::expand_lock(), |
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1509 Mutex::_no_safepoint_check_flag); |
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|
1510 locked_verify_free_chunks_total(); |
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|
1511 } |
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|
1512 #endif |
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|
1513 return _free_chunks_total; |
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|
1514 } |
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|
1515 |
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1516 size_t ChunkManager::free_chunks_total_in_bytes() { |
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1517 return free_chunks_total() * BytesPerWord; |
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|
1518 } |
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|
1519 |
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1520 size_t ChunkManager::free_chunks_count() { |
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|
1521 #ifdef ASSERT |
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1522 if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) { |
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1523 MutexLockerEx cl(SpaceManager::expand_lock(), |
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|
1524 Mutex::_no_safepoint_check_flag); |
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1525 // This lock is only needed in debug because the verification |
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|
1526 // of the _free_chunks_totals walks the list of free chunks |
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|
1527 locked_verify_free_chunks_count(); |
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|
1528 } |
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|
1529 #endif |
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|
1530 return _free_chunks_count; |
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|
1531 } |
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|
1532 |
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|
1533 void ChunkManager::locked_verify_free_chunks_total() { |
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|
1534 assert_lock_strong(SpaceManager::expand_lock()); |
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|
1535 assert(sum_free_chunks() == _free_chunks_total, |
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|
1536 err_msg("_free_chunks_total " SIZE_FORMAT " is not the" |
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|
1537 " same as sum " SIZE_FORMAT, _free_chunks_total, |
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|
1538 sum_free_chunks())); |
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|
1539 } |
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|
1540 |
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|
1541 void ChunkManager::verify_free_chunks_total() { |
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|
1542 MutexLockerEx cl(SpaceManager::expand_lock(), |
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|
1543 Mutex::_no_safepoint_check_flag); |
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1544 locked_verify_free_chunks_total(); |
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1545 } |
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1546 |
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1547 void ChunkManager::locked_verify_free_chunks_count() { |
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1548 assert_lock_strong(SpaceManager::expand_lock()); |
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1549 assert(sum_free_chunks_count() == _free_chunks_count, |
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1550 err_msg("_free_chunks_count " SIZE_FORMAT " is not the" |
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1551 " same as sum " SIZE_FORMAT, _free_chunks_count, |
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1552 sum_free_chunks_count())); |
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1553 } |
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1554 |
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1555 void ChunkManager::verify_free_chunks_count() { |
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1556 #ifdef ASSERT |
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1557 MutexLockerEx cl(SpaceManager::expand_lock(), |
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1558 Mutex::_no_safepoint_check_flag); |
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1559 locked_verify_free_chunks_count(); |
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1560 #endif |
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1561 } |
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1562 |
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1563 void ChunkManager::verify() { |
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1564 #ifdef ASSERT |
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1565 if (!UseConcMarkSweepGC) { |
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1566 MutexLockerEx cl(SpaceManager::expand_lock(), |
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1567 Mutex::_no_safepoint_check_flag); |
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1568 locked_verify_free_chunks_total(); |
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1569 locked_verify_free_chunks_count(); |
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1570 } |
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1571 #endif |
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1572 } |
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1573 |
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1574 void ChunkManager::locked_verify() { |
6885 | 1575 locked_verify_free_chunks_count(); |
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1576 locked_verify_free_chunks_total(); |
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1577 } |
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1578 |
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1579 void ChunkManager::locked_print_free_chunks(outputStream* st) { |
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1580 assert_lock_strong(SpaceManager::expand_lock()); |
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1581 st->print_cr("Free chunk total 0x%x count 0x%x", |
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1582 _free_chunks_total, _free_chunks_count); |
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1583 } |
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1584 |
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1585 void ChunkManager::locked_print_sum_free_chunks(outputStream* st) { |
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1586 assert_lock_strong(SpaceManager::expand_lock()); |
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1587 st->print_cr("Sum free chunk total 0x%x count 0x%x", |
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1588 sum_free_chunks(), sum_free_chunks_count()); |
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1589 } |
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1590 ChunkList* ChunkManager::free_chunks(ChunkIndex index) { |
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1591 return &_free_chunks[index]; |
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1592 } |
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1593 |
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1594 // These methods that sum the free chunk lists are used in printing |
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1595 // methods that are used in product builds. |
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1596 size_t ChunkManager::sum_free_chunks() { |
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1597 assert_lock_strong(SpaceManager::expand_lock()); |
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1598 size_t result = 0; |
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1599 for (ChunkIndex i = SmallIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) { |
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1600 ChunkList* list = free_chunks(i); |
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1601 |
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1602 if (list == NULL) { |
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1603 continue; |
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1604 } |
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1605 |
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1606 result = result + list->sum_list_capacity(); |
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1607 } |
6885 | 1608 result = result + humongous_dictionary()->total_size(); |
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1609 return result; |
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1610 } |
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1611 |
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1612 size_t ChunkManager::sum_free_chunks_count() { |
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1613 assert_lock_strong(SpaceManager::expand_lock()); |
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1614 size_t count = 0; |
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1615 for (ChunkIndex i = SmallIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) { |
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1616 ChunkList* list = free_chunks(i); |
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1617 if (list == NULL) { |
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1618 continue; |
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1619 } |
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1620 count = count + list->sum_list_count(); |
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1621 } |
6885 | 1622 count = count + humongous_dictionary()->total_free_blocks(); |
6725
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1623 return count; |
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1624 } |
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1625 |
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1626 ChunkList* ChunkManager::find_free_chunks_list(size_t word_size) { |
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1627 switch (word_size) { |
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1628 case SpaceManager::SmallChunk : |
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1629 return &_free_chunks[0]; |
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1630 case SpaceManager::MediumChunk : |
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1631 return &_free_chunks[1]; |
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1632 default: |
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1633 assert(word_size > SpaceManager::MediumChunk, "List inconsistency"); |
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1634 return &_free_chunks[2]; |
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|
1635 } |
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1636 } |
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1637 |
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1638 void ChunkManager::free_chunks_put(Metachunk* chunk) { |
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1639 assert_lock_strong(SpaceManager::expand_lock()); |
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1640 ChunkList* free_list = find_free_chunks_list(chunk->word_size()); |
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1641 chunk->set_next(free_list->head()); |
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1642 free_list->set_head(chunk); |
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1643 // chunk is being returned to the chunk free list |
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1644 inc_free_chunks_total(chunk->capacity_word_size()); |
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1645 locked_verify(); |
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|
1646 } |
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|
1647 |
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1648 void ChunkManager::chunk_freelist_deallocate(Metachunk* chunk) { |
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1649 // The deallocation of a chunk originates in the freelist |
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1650 // manangement code for a Metaspace and does not hold the |
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|
1651 // lock. |
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1652 assert(chunk != NULL, "Deallocating NULL"); |
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1653 // MutexLockerEx fcl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag); |
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|
1654 locked_verify(); |
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1655 if (TraceMetadataChunkAllocation) { |
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1656 tty->print_cr("ChunkManager::chunk_freelist_deallocate: chunk " |
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|
1657 PTR_FORMAT " size " SIZE_FORMAT, |
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1658 chunk, chunk->word_size()); |
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|
1659 } |
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|
1660 free_chunks_put(chunk); |
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|
1661 } |
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1662 |
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1663 Metachunk* ChunkManager::free_chunks_get(size_t word_size) { |
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1664 assert_lock_strong(SpaceManager::expand_lock()); |
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1665 |
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1666 locked_verify(); |
6885 | 1667 |
1668 Metachunk* chunk = NULL; | |
1669 if (!SpaceManager::is_humongous(word_size)) { | |
1670 ChunkList* free_list = find_free_chunks_list(word_size); | |
1671 assert(free_list != NULL, "Sanity check"); | |
1672 | |
1673 chunk = free_list->head(); | |
1674 debug_only(Metachunk* debug_head = chunk;) | |
1675 | |
1676 if (chunk == NULL) { | |
1677 return NULL; | |
1678 } | |
1679 | |
6725
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1680 // Remove the chunk as the head of the list. |
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1681 free_list->set_head(chunk->next()); |
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|
1682 chunk->set_next(NULL); |
6885 | 1683 // Chunk has been removed from the chunks free list. |
1684 dec_free_chunks_total(chunk->capacity_word_size()); | |
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1685 |
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1686 if (TraceMetadataChunkAllocation && Verbose) { |
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1687 tty->print_cr("ChunkManager::free_chunks_get: free_list " |
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1688 PTR_FORMAT " head " PTR_FORMAT " size " SIZE_FORMAT, |
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1689 free_list, chunk, chunk->word_size()); |
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|
1690 } |
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1691 } else { |
6885 | 1692 chunk = humongous_dictionary()->get_chunk( |
1693 word_size, | |
1694 FreeBlockDictionary<Metachunk>::atLeast); | |
1695 | |
1696 if (chunk != NULL) { | |
1697 if (TraceMetadataHumongousAllocation) { | |
1698 size_t waste = chunk->word_size() - word_size; | |
1699 tty->print_cr("Free list allocate humongous chunk size " SIZE_FORMAT | |
1700 " for requested size " SIZE_FORMAT | |
1701 " waste " SIZE_FORMAT, | |
1702 chunk->word_size(), word_size, waste); | |
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1703 } |
6885 | 1704 // Chunk is being removed from the chunks free list. |
1705 dec_free_chunks_total(chunk->capacity_word_size()); | |
1706 #ifdef ASSERT | |
1707 chunk->set_is_free(false); | |
1708 #endif | |
1709 } | |
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1710 } |
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1711 locked_verify(); |
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1712 return chunk; |
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1713 } |
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1714 |
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1715 Metachunk* ChunkManager::chunk_freelist_allocate(size_t word_size) { |
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1716 assert_lock_strong(SpaceManager::expand_lock()); |
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1717 locked_verify(); |
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1718 |
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1719 // Take from the beginning of the list |
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1720 Metachunk* chunk = free_chunks_get(word_size); |
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1721 if (chunk == NULL) { |
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1722 return NULL; |
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1723 } |
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1724 |
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1725 assert(word_size <= chunk->word_size() || |
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1726 SpaceManager::is_humongous(chunk->word_size()), |
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1727 "Non-humongous variable sized chunk"); |
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1728 if (TraceMetadataChunkAllocation) { |
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1729 tty->print("ChunkManager::chunk_freelist_allocate: chunk " |
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1730 PTR_FORMAT " size " SIZE_FORMAT " ", |
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1731 chunk, chunk->word_size()); |
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1732 locked_print_free_chunks(tty); |
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1733 } |
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1734 |
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1735 return chunk; |
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1736 } |
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1737 |
6885 | 1738 void ChunkManager::print_on(outputStream* out) { |
1739 if (PrintFLSStatistics != 0) { | |
1740 humongous_dictionary()->report_statistics(); | |
1741 } | |
1742 } | |
1743 | |
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1744 // SpaceManager methods |
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1745 |
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1746 size_t SpaceManager::sum_free_in_chunks_in_use() const { |
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1747 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
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1748 size_t free = 0; |
6885 | 1749 for (ChunkIndex i = SmallIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
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1750 Metachunk* chunk = chunks_in_use(i); |
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1751 while (chunk != NULL) { |
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1752 free += chunk->free_word_size(); |
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1753 chunk = chunk->next(); |
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1754 } |
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1755 } |
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1756 return free; |
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1757 } |
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1758 |
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1759 size_t SpaceManager::sum_waste_in_chunks_in_use() const { |
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1760 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
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1761 size_t result = 0; |
6885 | 1762 for (ChunkIndex i = SmallIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
1763 | |
1764 | |
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1765 result += sum_waste_in_chunks_in_use(i); |
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1766 } |
6885 | 1767 |
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1768 return result; |
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1769 } |
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1770 |
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1771 size_t SpaceManager::sum_waste_in_chunks_in_use(ChunkIndex index) const { |
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1772 size_t result = 0; |
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1773 size_t count = 0; |
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1774 Metachunk* chunk = chunks_in_use(index); |
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1775 // Count the free space in all the chunk but not the |
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1776 // current chunk from which allocations are still being done. |
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1777 if (chunk != NULL) { |
6885 | 1778 Metachunk* prev = chunk; |
1779 while (chunk != NULL && chunk != current_chunk()) { | |
1780 result += chunk->free_word_size(); | |
1781 prev = chunk; | |
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1782 chunk = chunk->next(); |
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1783 count++; |
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1784 } |
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1785 } |
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1786 return result; |
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1787 } |
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1788 |
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1789 size_t SpaceManager::sum_capacity_in_chunks_in_use() const { |
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1790 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
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1791 size_t sum = 0; |
6885 | 1792 for (ChunkIndex i = SmallIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
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1793 Metachunk* chunk = chunks_in_use(i); |
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1794 while (chunk != NULL) { |
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1795 // Just changed this sum += chunk->capacity_word_size(); |
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1796 // sum += chunk->word_size() - Metachunk::overhead(); |
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1797 sum += chunk->capacity_word_size(); |
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1798 chunk = chunk->next(); |
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1799 } |
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1800 } |
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1801 return sum; |
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1802 } |
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1803 |
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1804 size_t SpaceManager::sum_count_in_chunks_in_use() { |
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1805 size_t count = 0; |
6885 | 1806 for (ChunkIndex i = SmallIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
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1807 count = count + sum_count_in_chunks_in_use(i); |
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1808 } |
6885 | 1809 |
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1810 return count; |
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1811 } |
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1812 |
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1813 size_t SpaceManager::sum_count_in_chunks_in_use(ChunkIndex i) { |
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1814 size_t count = 0; |
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1815 Metachunk* chunk = chunks_in_use(i); |
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1816 while (chunk != NULL) { |
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1817 count++; |
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1818 chunk = chunk->next(); |
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1819 } |
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1820 return count; |
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1821 } |
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1822 |
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1823 |
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1824 size_t SpaceManager::sum_used_in_chunks_in_use() const { |
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1825 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
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1826 size_t used = 0; |
6885 | 1827 for (ChunkIndex i = SmallIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
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1828 Metachunk* chunk = chunks_in_use(i); |
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1829 while (chunk != NULL) { |
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1830 used += chunk->used_word_size(); |
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1831 chunk = chunk->next(); |
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1832 } |
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1833 } |
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1834 return used; |
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1835 } |
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1836 |
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1837 void SpaceManager::locked_print_chunks_in_use_on(outputStream* st) const { |
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1838 |
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1839 Metachunk* small_chunk = chunks_in_use(SmallIndex); |
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1840 st->print_cr("SpaceManager: small chunk " PTR_FORMAT |
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1841 " free " SIZE_FORMAT, |
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1842 small_chunk, |
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1843 small_chunk->free_word_size()); |
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1844 |
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1845 Metachunk* medium_chunk = chunks_in_use(MediumIndex); |
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1846 st->print("medium chunk " PTR_FORMAT, medium_chunk); |
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1847 Metachunk* tail = current_chunk(); |
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1848 st->print_cr(" current chunk " PTR_FORMAT, tail); |
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1849 |
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1850 Metachunk* head = chunks_in_use(HumongousIndex); |
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1851 st->print_cr("humongous chunk " PTR_FORMAT, head); |
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1852 |
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1853 vs_list()->chunk_manager()->locked_print_free_chunks(st); |
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1854 vs_list()->chunk_manager()->locked_print_sum_free_chunks(st); |
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1855 } |
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1856 |
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1857 size_t SpaceManager::calc_chunk_size(size_t word_size) { |
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1858 |
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1859 // Decide between a small chunk and a medium chunk. Up to |
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1860 // _small_chunk_limit small chunks can be allocated but |
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1861 // once a medium chunk has been allocated, no more small |
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1862 // chunks will be allocated. |
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1863 size_t chunk_word_size; |
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1864 if (chunks_in_use(MediumIndex) == NULL && |
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1865 (!has_small_chunk_limit() || |
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1866 sum_count_in_chunks_in_use(SmallIndex) < _small_chunk_limit)) { |
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1867 chunk_word_size = (size_t) SpaceManager::SmallChunk; |
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1868 if (word_size + Metachunk::overhead() > SpaceManager::SmallChunk) { |
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1869 chunk_word_size = MediumChunk; |
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1870 } |
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1871 } else { |
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1872 chunk_word_size = MediumChunk; |
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1873 } |
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1874 |
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1875 // Might still need a humongous chunk |
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1876 chunk_word_size = |
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1877 MAX2((size_t) chunk_word_size, word_size + Metachunk::overhead()); |
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1878 |
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1879 if (TraceMetadataHumongousAllocation && |
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1880 SpaceManager::is_humongous(word_size)) { |
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1881 gclog_or_tty->print_cr("Metadata humongous allocation:"); |
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1882 gclog_or_tty->print_cr(" word_size " PTR_FORMAT, word_size); |
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1883 gclog_or_tty->print_cr(" chunk_word_size " PTR_FORMAT, |
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1884 chunk_word_size); |
6885 | 1885 gclog_or_tty->print_cr(" chunk overhead " PTR_FORMAT, |
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1886 Metachunk::overhead()); |
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1887 } |
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1888 return chunk_word_size; |
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1889 } |
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1890 |
6885 | 1891 MetaWord* SpaceManager::grow_and_allocate(size_t word_size) { |
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1892 assert(vs_list()->current_virtual_space() != NULL, |
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1893 "Should have been set"); |
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1894 assert(current_chunk() == NULL || |
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1895 current_chunk()->allocate(word_size) == NULL, |
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1896 "Don't need to expand"); |
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1897 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag); |
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1898 |
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1899 if (TraceMetadataChunkAllocation && Verbose) { |
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1900 gclog_or_tty->print_cr("SpaceManager::grow_and_allocate for " SIZE_FORMAT |
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1901 " words " SIZE_FORMAT " space left", |
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1902 word_size, current_chunk() != NULL ? |
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1903 current_chunk()->free_word_size() : 0); |
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1904 } |
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1905 |
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1906 // Get another chunk out of the virtual space |
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1907 size_t grow_chunks_by_words = calc_chunk_size(word_size); |
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1908 Metachunk* next = vs_list()->get_new_chunk(word_size, grow_chunks_by_words); |
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1909 |
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1910 // If a chunk was available, add it to the in-use chunk list |
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1911 // and do an allocation from it. |
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1912 if (next != NULL) { |
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1913 Metadebug::deallocate_chunk_a_lot(this, grow_chunks_by_words); |
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1914 // Add to this manager's list of chunks in use. |
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1915 add_chunk(next, false); |
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1916 return next->allocate(word_size); |
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1917 } |
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1918 return NULL; |
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1919 } |
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1920 |
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1921 void SpaceManager::print_on(outputStream* st) const { |
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1922 |
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1923 for (ChunkIndex i = SmallIndex; |
6885 | 1924 i < NumberOfInUseLists ; |
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1925 i = next_chunk_index(i) ) { |
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1926 st->print_cr(" chunks_in_use " PTR_FORMAT " chunk size " PTR_FORMAT, |
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1927 chunks_in_use(i), |
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1928 chunks_in_use(i) == NULL ? 0 : chunks_in_use(i)->word_size()); |
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1929 } |
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1930 st->print_cr(" waste: Small " SIZE_FORMAT " Medium " SIZE_FORMAT |
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1931 " Humongous " SIZE_FORMAT, |
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1932 sum_waste_in_chunks_in_use(SmallIndex), |
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1933 sum_waste_in_chunks_in_use(MediumIndex), |
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1934 sum_waste_in_chunks_in_use(HumongousIndex)); |
6885 | 1935 // block free lists |
1936 if (block_freelists() != NULL) { | |
1937 st->print_cr("total in block free lists " SIZE_FORMAT, | |
1938 block_freelists()->total_size()); | |
1939 } | |
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1940 } |
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1941 |
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1942 SpaceManager::SpaceManager(Mutex* lock, VirtualSpaceList* vs_list) : |
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1943 _vs_list(vs_list), |
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1944 _allocation_total(0), |
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1945 _lock(lock) { |
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1946 Metadebug::init_allocation_fail_alot_count(); |
6885 | 1947 for (ChunkIndex i = SmallIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
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1948 _chunks_in_use[i] = NULL; |
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1949 } |
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1950 _current_chunk = NULL; |
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1951 if (TraceMetadataChunkAllocation && Verbose) { |
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1952 gclog_or_tty->print_cr("SpaceManager(): " PTR_FORMAT, this); |
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1953 } |
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1954 } |
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1955 |
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1956 SpaceManager::~SpaceManager() { |
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1957 MutexLockerEx fcl(SpaceManager::expand_lock(), |
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1958 Mutex::_no_safepoint_check_flag); |
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1959 |
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1960 ChunkManager* chunk_manager = vs_list()->chunk_manager(); |
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1961 |
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1962 chunk_manager->locked_verify(); |
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1963 |
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1964 if (TraceMetadataChunkAllocation && Verbose) { |
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1965 gclog_or_tty->print_cr("~SpaceManager(): " PTR_FORMAT, this); |
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1966 locked_print_chunks_in_use_on(gclog_or_tty); |
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1967 } |
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1968 |
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1969 // Have to update before the chunks_in_use lists are emptied |
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1970 // below. |
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1971 chunk_manager->inc_free_chunks_total(sum_capacity_in_chunks_in_use(), |
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1972 sum_count_in_chunks_in_use()); |
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1973 |
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1974 #ifdef ASSERT |
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1975 // Mangle freed memory. |
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1976 mangle_freed_chunks(); |
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1977 #endif // ASSERT |
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1978 |
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1979 // Add all the chunks in use by this space manager |
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1980 // to the global list of free chunks. |
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1981 |
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1982 // Small chunks. There is one _current_chunk for each |
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1983 // Metaspace. It could point to a small or medium chunk. |
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1984 // Rather than determine which it is, follow the list of |
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1985 // small chunks to add them to the free list |
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1986 Metachunk* small_chunk = chunks_in_use(SmallIndex); |
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1987 chunk_manager->free_small_chunks()->add_at_head(small_chunk); |
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1988 set_chunks_in_use(SmallIndex, NULL); |
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1989 |
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1990 // After the small chunk are the medium chunks |
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1991 Metachunk* medium_chunk = chunks_in_use(MediumIndex); |
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1992 assert(medium_chunk == NULL || |
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1993 medium_chunk->word_size() == MediumChunk, |
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1994 "Chunk is on the wrong list"); |
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1995 |
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1996 if (medium_chunk != NULL) { |
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1997 Metachunk* head = medium_chunk; |
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1998 // If there is a medium chunk then the _current_chunk can only |
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1999 // point to the last medium chunk. |
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2000 Metachunk* tail = current_chunk(); |
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2001 chunk_manager->free_medium_chunks()->add_at_head(head, tail); |
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2002 set_chunks_in_use(MediumIndex, NULL); |
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2003 } |
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2004 |
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2005 // Humongous chunks |
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2006 // Humongous chunks are never the current chunk. |
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2007 Metachunk* humongous_chunks = chunks_in_use(HumongousIndex); |
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2008 |
6885 | 2009 while (humongous_chunks != NULL) { |
2010 #ifdef ASSERT | |
2011 humongous_chunks->set_is_free(true); | |
2012 #endif | |
2013 Metachunk* next_humongous_chunks = humongous_chunks->next(); | |
2014 chunk_manager->humongous_dictionary()->return_chunk(humongous_chunks); | |
2015 humongous_chunks = next_humongous_chunks; | |
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2016 } |
6885 | 2017 set_chunks_in_use(HumongousIndex, NULL); |
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2018 chunk_manager->locked_verify(); |
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2019 } |
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2020 |
6885 | 2021 void SpaceManager::deallocate(MetaWord* p, size_t word_size) { |
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2022 assert_lock_strong(_lock); |
6885 | 2023 size_t min_size = TreeChunk<Metablock, FreeList>::min_size(); |
2024 assert(word_size >= min_size, | |
2025 err_msg("Should not deallocate dark matter " SIZE_FORMAT, word_size)); | |
2026 block_freelists()->return_block(p, word_size); | |
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2027 } |
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2028 |
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2029 // Adds a chunk to the list of chunks in use. |
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2030 void SpaceManager::add_chunk(Metachunk* new_chunk, bool make_current) { |
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2031 |
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2032 assert(new_chunk != NULL, "Should not be NULL"); |
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2033 assert(new_chunk->next() == NULL, "Should not be on a list"); |
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2034 |
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2035 new_chunk->reset_empty(); |
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2036 |
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2037 // Find the correct list and and set the current |
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2038 // chunk for that list. |
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2039 switch (new_chunk->word_size()) { |
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2040 case SpaceManager::SmallChunk : |
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2041 if (chunks_in_use(SmallIndex) == NULL) { |
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2042 // First chunk to add to the list |
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2043 set_chunks_in_use(SmallIndex, new_chunk); |
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2044 } else { |
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2045 assert(current_chunk()->word_size() == SpaceManager::SmallChunk, |
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2046 err_msg( "Incorrect mix of sizes in chunk list " |
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2047 SIZE_FORMAT " new chunk " SIZE_FORMAT, |
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2048 current_chunk()->word_size(), new_chunk->word_size())); |
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2049 current_chunk()->set_next(new_chunk); |
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2050 } |
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2051 // Make current chunk |
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2052 set_current_chunk(new_chunk); |
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2053 break; |
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2054 case SpaceManager::MediumChunk : |
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2055 if (chunks_in_use(MediumIndex) == NULL) { |
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2056 // About to add the first medium chunk so teminate the |
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2057 // small chunk list. In general once medium chunks are |
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2058 // being added, we're past the need for small chunks. |
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2059 if (current_chunk() != NULL) { |
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2060 // Only a small chunk or the initial chunk could be |
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2061 // the current chunk if this is the first medium chunk. |
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2062 assert(current_chunk()->word_size() == SpaceManager::SmallChunk || |
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2063 chunks_in_use(SmallIndex) == NULL, |
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2064 err_msg("Should be a small chunk or initial chunk, current chunk " |
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2065 SIZE_FORMAT " new chunk " SIZE_FORMAT, |
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2066 current_chunk()->word_size(), new_chunk->word_size())); |
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2067 current_chunk()->set_next(NULL); |
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2068 } |
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2069 // First chunk to add to the list |
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2070 set_chunks_in_use(MediumIndex, new_chunk); |
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2071 |
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2072 } else { |
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2073 // As a minimum the first medium chunk added would |
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2074 // have become the _current_chunk |
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2075 // so the _current_chunk has to be non-NULL here |
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2076 // (although not necessarily still the first medium chunk). |
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2077 assert(current_chunk()->word_size() == SpaceManager::MediumChunk, |
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2078 "A medium chunk should the current chunk"); |
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2079 current_chunk()->set_next(new_chunk); |
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2080 } |
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2081 // Make current chunk |
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2082 set_current_chunk(new_chunk); |
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2083 break; |
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2084 default: { |
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2085 // For null class loader data and DumpSharedSpaces, the first chunk isn't |
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2086 // small, so small will be null. Link this first chunk as the current |
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2087 // chunk. |
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2088 if (make_current) { |
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2089 // Set as the current chunk but otherwise treat as a humongous chunk. |
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2090 set_current_chunk(new_chunk); |
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2091 } |
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2092 // Link at head. The _current_chunk only points to a humongous chunk for |
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2093 // the null class loader metaspace (class and data virtual space managers) |
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2094 // any humongous chunks so will not point to the tail |
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2095 // of the humongous chunks list. |
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2096 new_chunk->set_next(chunks_in_use(HumongousIndex)); |
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2097 set_chunks_in_use(HumongousIndex, new_chunk); |
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2098 |
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2099 assert(new_chunk->word_size() > MediumChunk, "List inconsistency"); |
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2100 } |
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2101 } |
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2102 |
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2103 assert(new_chunk->is_empty(), "Not ready for reuse"); |
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2104 if (TraceMetadataChunkAllocation && Verbose) { |
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2105 gclog_or_tty->print("SpaceManager::add_chunk: %d) ", |
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2106 sum_count_in_chunks_in_use()); |
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2107 new_chunk->print_on(gclog_or_tty); |
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2108 vs_list()->chunk_manager()->locked_print_free_chunks(tty); |
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2109 } |
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2110 } |
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2111 |
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2112 MetaWord* SpaceManager::allocate(size_t word_size) { |
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2113 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
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2114 |
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2115 // If only the dictionary is going to be used (i.e., no |
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2116 // indexed free list), then there is a minimum size requirement. |
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2117 // MinChunkSize is a placeholder for the real minimum size JJJ |
6885 | 2118 size_t byte_size = word_size * BytesPerWord; |
2119 | |
2120 size_t byte_size_with_overhead = byte_size + Metablock::overhead(); | |
2121 | |
2122 size_t raw_bytes_size = MAX2(byte_size_with_overhead, | |
2123 Metablock::min_block_byte_size()); | |
2124 raw_bytes_size = ARENA_ALIGN(raw_bytes_size); | |
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2125 size_t raw_word_size = raw_bytes_size / BytesPerWord; |
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2126 assert(raw_word_size * BytesPerWord == raw_bytes_size, "Size problem"); |
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2127 |
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2128 BlockFreelist* fl = block_freelists(); |
6885 | 2129 MetaWord* p = NULL; |
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2130 // Allocation from the dictionary is expensive in the sense that |
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2131 // the dictionary has to be searched for a size. Don't allocate |
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2132 // from the dictionary until it starts to get fat. Is this |
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2133 // a reasonable policy? Maybe an skinny dictionary is fast enough |
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2134 // for allocations. Do some profiling. JJJ |
6885 | 2135 if (fl->total_size() > allocation_from_dictionary_limit) { |
2136 p = fl->get_block(raw_word_size); | |
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2137 } |
6885 | 2138 if (p == NULL) { |
2139 p = allocate_work(raw_word_size); | |
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2140 } |
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2141 Metadebug::deallocate_block_a_lot(this, raw_word_size); |
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2142 |
6885 | 2143 return p; |
6725
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2144 } |
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2145 |
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2146 // Returns the address of spaced allocated for "word_size". |
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2147 // This methods does not know about blocks (Metablocks) |
6885 | 2148 MetaWord* SpaceManager::allocate_work(size_t word_size) { |
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2149 assert_lock_strong(_lock); |
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2150 #ifdef ASSERT |
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2151 if (Metadebug::test_metadata_failure()) { |
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2152 return NULL; |
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2153 } |
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2154 #endif |
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2155 // Is there space in the current chunk? |
6885 | 2156 MetaWord* result = NULL; |
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2157 |
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2158 // For DumpSharedSpaces, only allocate out of the current chunk which is |
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2159 // never null because we gave it the size we wanted. Caller reports out |
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2160 // of memory if this returns null. |
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2161 if (DumpSharedSpaces) { |
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2162 assert(current_chunk() != NULL, "should never happen"); |
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2163 inc_allocation_total(word_size); |
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2164 return current_chunk()->allocate(word_size); // caller handles null result |
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2165 } |
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2166 if (current_chunk() != NULL) { |
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2167 result = current_chunk()->allocate(word_size); |
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2168 } |
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2169 |
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2170 if (result == NULL) { |
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2171 result = grow_and_allocate(word_size); |
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2172 } |
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2173 if (result > 0) { |
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2174 inc_allocation_total(word_size); |
6885 | 2175 assert(result != (MetaWord*) chunks_in_use(MediumIndex), |
2176 "Head of the list is being allocated"); | |
6725
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2177 } |
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2178 |
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2179 return result; |
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2180 } |
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2181 |
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2182 void SpaceManager::verify() { |
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2183 // If there are blocks in the dictionary, then |
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2184 // verfication of chunks does not work since |
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2185 // being in the dictionary alters a chunk. |
6885 | 2186 if (block_freelists()->total_size() == 0) { |
6725
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2187 // Skip the small chunks because their next link points to |
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2188 // medium chunks. This is because the small chunk is the |
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2189 // current chunk (for allocations) until it is full and the |
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2190 // the addition of the next chunk does not NULL the next |
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2191 // like of the small chunk. |
6885 | 2192 for (ChunkIndex i = MediumIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
6725
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2193 Metachunk* curr = chunks_in_use(i); |
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2194 while (curr != NULL) { |
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2195 curr->verify(); |
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2196 curr = curr->next(); |
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|
2197 } |
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2198 } |
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2199 } |
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2200 } |
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2201 |
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2202 #ifdef ASSERT |
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2203 void SpaceManager::verify_allocation_total() { |
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2204 #if 0 |
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2205 // Verification is only guaranteed at a safepoint. |
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2206 if (SafepointSynchronize::is_at_safepoint()) { |
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2207 gclog_or_tty->print_cr("Chunk " PTR_FORMAT " allocation_total " SIZE_FORMAT |
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2208 " sum_used_in_chunks_in_use " SIZE_FORMAT, |
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2209 this, |
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2210 allocation_total(), |
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2211 sum_used_in_chunks_in_use()); |
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2212 } |
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2213 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
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2214 assert(allocation_total() == sum_used_in_chunks_in_use(), |
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2215 err_msg("allocation total is not consistent %d vs %d", |
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2216 allocation_total(), sum_used_in_chunks_in_use())); |
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2217 #endif |
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2218 } |
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2219 |
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2220 #endif |
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2221 |
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2222 void SpaceManager::dump(outputStream* const out) const { |
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2223 size_t curr_total = 0; |
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2224 size_t waste = 0; |
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|
2225 uint i = 0; |
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|
2226 size_t used = 0; |
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2227 size_t capacity = 0; |
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|
2228 |
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|
2229 // Add up statistics for all chunks in this SpaceManager. |
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|
2230 for (ChunkIndex index = SmallIndex; |
6885 | 2231 index < NumberOfInUseLists; |
6725
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2232 index = next_chunk_index(index)) { |
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|
2233 for (Metachunk* curr = chunks_in_use(index); |
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2234 curr != NULL; |
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|
2235 curr = curr->next()) { |
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|
2236 out->print("%d) ", i++); |
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|
2237 curr->print_on(out); |
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2238 if (TraceMetadataChunkAllocation && Verbose) { |
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|
2239 block_freelists()->print_on(out); |
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|
2240 } |
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|
2241 curr_total += curr->word_size(); |
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2242 used += curr->used_word_size(); |
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2243 capacity += curr->capacity_word_size(); |
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2244 waste += curr->free_word_size() + curr->overhead();; |
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2245 } |
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2246 } |
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|
2247 |
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|
2248 size_t free = current_chunk()->free_word_size(); |
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2249 // Free space isn't wasted. |
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|
2250 waste -= free; |
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|
2251 |
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2252 out->print_cr("total of all chunks " SIZE_FORMAT " used " SIZE_FORMAT |
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2253 " free " SIZE_FORMAT " capacity " SIZE_FORMAT |
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|
2254 " waste " SIZE_FORMAT, curr_total, used, free, capacity, waste); |
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|
2255 } |
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|
2256 |
6786 | 2257 #ifdef ASSERT |
6725
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|
2258 void SpaceManager::mangle_freed_chunks() { |
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|
2259 for (ChunkIndex index = SmallIndex; |
6885 | 2260 index < NumberOfInUseLists; |
6725
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|
2261 index = next_chunk_index(index)) { |
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|
2262 for (Metachunk* curr = chunks_in_use(index); |
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|
2263 curr != NULL; |
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|
2264 curr = curr->next()) { |
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diff
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|
2265 // Try to detect incorrectly terminated small chunk |
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|
2266 // list. |
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|
2267 assert(index == MediumIndex || curr != chunks_in_use(MediumIndex), |
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|
2268 err_msg("Mangling medium chunks in small chunks? " |
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|
2269 "curr " PTR_FORMAT " medium list " PTR_FORMAT, |
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|
2270 curr, chunks_in_use(MediumIndex))); |
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|
2271 curr->mangle(); |
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|
2272 } |
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|
2273 } |
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|
2274 } |
6786 | 2275 #endif // ASSERT |
6725
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|
2276 |
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|
2277 |
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|
2278 // MetaspaceAux |
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|
2279 |
6734 | 2280 size_t MetaspaceAux::used_in_bytes(Metaspace::MetadataType mdtype) { |
6730
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7195789: NPG: assert(used + free == capacity) failed: Accounting is wrong
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6726
diff
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|
2281 size_t used = 0; |
5d2156bcb78b
7195789: NPG: assert(used + free == capacity) failed: Accounting is wrong
jmasa
parents:
6726
diff
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|
2282 ClassLoaderDataGraphMetaspaceIterator iter; |
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7195789: NPG: assert(used + free == capacity) failed: Accounting is wrong
jmasa
parents:
6726
diff
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|
2283 while (iter.repeat()) { |
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6726
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2284 Metaspace* msp = iter.get_next(); |
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2285 // Sum allocation_total for each metaspace |
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6726
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2286 if (msp != NULL) { |
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6726
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2287 used += msp->used_words(mdtype); |
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6726
diff
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|
2288 } |
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6726
diff
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|
2289 } |
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|
2290 return used * BytesPerWord; |
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6726
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|
2291 } |
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|
2292 |
6725
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2293 size_t MetaspaceAux::free_in_bytes(Metaspace::MetadataType mdtype) { |
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2294 size_t free = 0; |
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2295 ClassLoaderDataGraphMetaspaceIterator iter; |
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2296 while (iter.repeat()) { |
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2297 Metaspace* msp = iter.get_next(); |
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2298 if (msp != NULL) { |
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2299 free += msp->free_words(mdtype); |
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|
2300 } |
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|
2301 } |
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|
2302 return free * BytesPerWord; |
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|
2303 } |
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|
2304 |
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2305 // The total words available for metadata allocation. This |
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2306 // uses Metaspace capacity_words() which is the total words |
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2307 // in chunks allocated for a Metaspace. |
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2308 size_t MetaspaceAux::capacity_in_bytes(Metaspace::MetadataType mdtype) { |
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2309 size_t capacity = free_chunks_total(mdtype); |
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2310 ClassLoaderDataGraphMetaspaceIterator iter; |
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2311 while (iter.repeat()) { |
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2312 Metaspace* msp = iter.get_next(); |
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2313 if (msp != NULL) { |
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2314 capacity += msp->capacity_words(mdtype); |
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|
2315 } |
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|
2316 } |
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2317 return capacity * BytesPerWord; |
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|
2318 } |
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|
2319 |
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2320 size_t MetaspaceAux::reserved_in_bytes(Metaspace::MetadataType mdtype) { |
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2321 size_t reserved = (mdtype == Metaspace::ClassType) ? |
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2322 Metaspace::class_space_list()->virtual_space_total() : |
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2323 Metaspace::space_list()->virtual_space_total(); |
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2324 return reserved * BytesPerWord; |
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|
2325 } |
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|
2326 |
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|
2327 size_t MetaspaceAux::min_chunk_size() { return SpaceManager::MediumChunk; } |
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2328 |
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2329 size_t MetaspaceAux::free_chunks_total(Metaspace::MetadataType mdtype) { |
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2330 ChunkManager* chunk = (mdtype == Metaspace::ClassType) ? |
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|
2331 Metaspace::class_space_list()->chunk_manager() : |
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|
2332 Metaspace::space_list()->chunk_manager(); |
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|
2333 |
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2334 chunk->verify_free_chunks_total(); |
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|
2335 return chunk->free_chunks_total(); |
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|
2336 } |
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|
2337 |
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2338 size_t MetaspaceAux::free_chunks_total_in_bytes(Metaspace::MetadataType mdtype) { |
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2339 return free_chunks_total(mdtype) * BytesPerWord; |
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2340 } |
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|
2341 |
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2342 void MetaspaceAux::print_metaspace_change(size_t prev_metadata_used) { |
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2343 gclog_or_tty->print(", [Metaspace:"); |
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2344 if (PrintGCDetails && Verbose) { |
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|
2345 gclog_or_tty->print(" " SIZE_FORMAT |
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|
2346 "->" SIZE_FORMAT |
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|
2347 "(" SIZE_FORMAT "/" SIZE_FORMAT ")", |
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diff
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|
2348 prev_metadata_used, |
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|
2349 used_in_bytes(), |
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|
2350 capacity_in_bytes(), |
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|
2351 reserved_in_bytes()); |
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diff
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|
2352 } else { |
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|
2353 gclog_or_tty->print(" " SIZE_FORMAT "K" |
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|
2354 "->" SIZE_FORMAT "K" |
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|
2355 "(" SIZE_FORMAT "K/" SIZE_FORMAT "K)", |
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diff
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|
2356 prev_metadata_used / K, |
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diff
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|
2357 used_in_bytes()/ K, |
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diff
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|
2358 capacity_in_bytes()/K, |
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diff
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|
2359 reserved_in_bytes()/ K); |
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diff
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|
2360 } |
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diff
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|
2361 |
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|
2362 gclog_or_tty->print("]"); |
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diff
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|
2363 } |
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diff
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|
2364 |
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diff
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|
2365 // This is printed when PrintGCDetails |
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|
2366 void MetaspaceAux::print_on(outputStream* out) { |
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|
2367 Metaspace::MetadataType ct = Metaspace::ClassType; |
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|
2368 Metaspace::MetadataType nct = Metaspace::NonClassType; |
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diff
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|
2369 |
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|
2370 out->print_cr(" Metaspace total " |
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|
2371 SIZE_FORMAT "K, used " SIZE_FORMAT "K," |
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diff
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|
2372 " reserved " SIZE_FORMAT "K", |
6734 | 2373 capacity_in_bytes()/K, used_in_bytes()/K, reserved_in_bytes()/K); |
6725
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diff
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|
2374 out->print_cr(" data space " |
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|
2375 SIZE_FORMAT "K, used " SIZE_FORMAT "K," |
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|
2376 " reserved " SIZE_FORMAT "K", |
6734 | 2377 capacity_in_bytes(nct)/K, used_in_bytes(nct)/K, reserved_in_bytes(nct)/K); |
6725
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diff
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|
2378 out->print_cr(" class space " |
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|
2379 SIZE_FORMAT "K, used " SIZE_FORMAT "K," |
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|
2380 " reserved " SIZE_FORMAT "K", |
6734 | 2381 capacity_in_bytes(ct)/K, used_in_bytes(ct)/K, reserved_in_bytes(ct)/K); |
6725
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|
2382 } |
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|
2383 |
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|
2384 // Print information for class space and data space separately. |
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diff
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|
2385 // This is almost the same as above. |
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|
2386 void MetaspaceAux::print_on(outputStream* out, Metaspace::MetadataType mdtype) { |
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|
2387 size_t free_chunks_capacity_bytes = free_chunks_total_in_bytes(mdtype); |
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|
2388 size_t capacity_bytes = capacity_in_bytes(mdtype); |
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|
2389 size_t used_bytes = used_in_bytes(mdtype); |
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|
2390 size_t free_bytes = free_in_bytes(mdtype); |
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|
2391 size_t used_and_free = used_bytes + free_bytes + |
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|
2392 free_chunks_capacity_bytes; |
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|
2393 out->print_cr(" Chunk accounting: used in chunks " SIZE_FORMAT |
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|
2394 "K + unused in chunks " SIZE_FORMAT "K + " |
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|
2395 " capacity in free chunks " SIZE_FORMAT "K = " SIZE_FORMAT |
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|
2396 "K capacity in allocated chunks " SIZE_FORMAT "K", |
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|
2397 used_bytes / K, |
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|
2398 free_bytes / K, |
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|
2399 free_chunks_capacity_bytes / K, |
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|
2400 used_and_free / K, |
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|
2401 capacity_bytes / K); |
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|
2402 assert(used_and_free == capacity_bytes, "Accounting is wrong"); |
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|
2403 } |
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|
2404 |
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|
2405 // Print total fragmentation for class and data metaspaces separately |
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|
2406 void MetaspaceAux::print_waste(outputStream* out) { |
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|
2407 |
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|
2408 size_t small_waste = 0, medium_waste = 0, large_waste = 0; |
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|
2409 size_t cls_small_waste = 0, cls_medium_waste = 0, cls_large_waste = 0; |
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|
2410 |
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|
2411 ClassLoaderDataGraphMetaspaceIterator iter; |
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|
2412 while (iter.repeat()) { |
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|
2413 Metaspace* msp = iter.get_next(); |
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|
2414 if (msp != NULL) { |
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|
2415 small_waste += msp->vsm()->sum_waste_in_chunks_in_use(SmallIndex); |
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2416 medium_waste += msp->vsm()->sum_waste_in_chunks_in_use(MediumIndex); |
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2417 large_waste += msp->vsm()->sum_waste_in_chunks_in_use(HumongousIndex); |
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|
2418 |
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|
2419 cls_small_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SmallIndex); |
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|
2420 cls_medium_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(MediumIndex); |
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2421 cls_large_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(HumongousIndex); |
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|
2422 } |
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|
2423 } |
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|
2424 out->print_cr("Total fragmentation waste (words) doesn't count free space"); |
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|
2425 out->print(" data: small " SIZE_FORMAT " medium " SIZE_FORMAT, |
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|
2426 small_waste, medium_waste); |
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|
2427 out->print_cr(" class: small " SIZE_FORMAT, cls_small_waste); |
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6964458: Reimplement class meta-data storage to use native memory
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diff
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|
2428 } |
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diff
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|
2429 |
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diff
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|
2430 // Dump global metaspace things from the end of ClassLoaderDataGraph |
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|
2431 void MetaspaceAux::dump(outputStream* out) { |
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|
2432 out->print_cr("All Metaspace:"); |
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|
2433 out->print("data space: "); print_on(out, Metaspace::NonClassType); |
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|
2434 out->print("class space: "); print_on(out, Metaspace::ClassType); |
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|
2435 print_waste(out); |
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diff
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|
2436 } |
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|
2437 |
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|
2438 // Metaspace methods |
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|
2439 |
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2440 size_t Metaspace::_first_chunk_word_size = 0; |
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2441 |
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2442 Metaspace::Metaspace(Mutex* lock, size_t word_size) { |
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|
2443 initialize(lock, word_size); |
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|
2444 } |
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|
2445 |
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2446 Metaspace::Metaspace(Mutex* lock) { |
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|
2447 initialize(lock); |
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|
2448 } |
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|
2449 |
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|
2450 Metaspace::~Metaspace() { |
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|
2451 delete _vsm; |
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|
2452 delete _class_vsm; |
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diff
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|
2453 } |
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|
2454 |
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|
2455 VirtualSpaceList* Metaspace::_space_list = NULL; |
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|
2456 VirtualSpaceList* Metaspace::_class_space_list = NULL; |
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|
2457 |
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|
2458 #define VIRTUALSPACEMULTIPLIER 2 |
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|
2459 |
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|
2460 void Metaspace::global_initialize() { |
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|
2461 // Initialize the alignment for shared spaces. |
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|
2462 int max_alignment = os::vm_page_size(); |
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|
2463 MetaspaceShared::set_max_alignment(max_alignment); |
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|
2464 |
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|
2465 if (DumpSharedSpaces) { |
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|
2466 SharedReadOnlySize = align_size_up(SharedReadOnlySize, max_alignment); |
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2467 SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment); |
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|
2468 SharedMiscDataSize = align_size_up(SharedMiscDataSize, max_alignment); |
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2469 SharedMiscCodeSize = align_size_up(SharedMiscCodeSize, max_alignment); |
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|
2470 |
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|
2471 // Initialize with the sum of the shared space sizes. The read-only |
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|
2472 // and read write metaspace chunks will be allocated out of this and the |
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|
2473 // remainder is the misc code and data chunks. |
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|
2474 size_t total = align_size_up(SharedReadOnlySize + SharedReadWriteSize + |
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|
2475 SharedMiscDataSize + SharedMiscCodeSize, |
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|
2476 os::vm_allocation_granularity()); |
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|
2477 size_t word_size = total/wordSize; |
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|
2478 _space_list = new VirtualSpaceList(word_size); |
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|
2479 } else { |
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|
2480 // If using shared space, open the file that contains the shared space |
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|
2481 // and map in the memory before initializing the rest of metaspace (so |
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|
2482 // the addresses don't conflict) |
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diff
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|
2483 if (UseSharedSpaces) { |
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|
2484 FileMapInfo* mapinfo = new FileMapInfo(); |
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|
2485 memset(mapinfo, 0, sizeof(FileMapInfo)); |
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|
2486 |
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|
2487 // Open the shared archive file, read and validate the header. If |
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|
2488 // initialization fails, shared spaces [UseSharedSpaces] are |
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diff
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|
2489 // disabled and the file is closed. |
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diff
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|
2490 // Map in spaces now also |
da91efe96a93
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diff
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|
2491 if (mapinfo->initialize() && MetaspaceShared::map_shared_spaces(mapinfo)) { |
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|
2492 FileMapInfo::set_current_info(mapinfo); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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diff
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|
2493 } else { |
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diff
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|
2494 assert(!mapinfo->is_open() && !UseSharedSpaces, |
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6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
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|
2495 "archive file not closed or shared spaces not disabled."); |
da91efe96a93
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coleenp
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diff
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|
2496 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
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|
2497 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
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|
2498 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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diff
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|
2499 // Initialize this before initializing the VirtualSpaceList |
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diff
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|
2500 _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord; |
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diff
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|
2501 // Arbitrarily set the initial virtual space to a multiple |
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coleenp
parents:
diff
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|
2502 // of the boot class loader size. |
da91efe96a93
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diff
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|
2503 size_t word_size = VIRTUALSPACEMULTIPLIER * Metaspace::first_chunk_word_size(); |
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diff
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|
2504 // Initialize the list of virtual spaces. |
da91efe96a93
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diff
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|
2505 _space_list = new VirtualSpaceList(word_size); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
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|
2506 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
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|
2507 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
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|
2508 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
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|
2509 // For UseCompressedKlassPointers the class space is reserved as a piece of the |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
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|
2510 // Java heap because the compression algorithm is the same for each. The |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2511 // argument passed in is at the top of the compressed space |
da91efe96a93
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coleenp
parents:
diff
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|
2512 void Metaspace::initialize_class_space(ReservedSpace rs) { |
da91efe96a93
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coleenp
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diff
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|
2513 // The reserved space size may be bigger because of alignment, esp with UseLargePages |
da91efe96a93
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coleenp
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diff
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|
2514 assert(rs.size() >= ClassMetaspaceSize, err_msg("%d != %d", rs.size(), ClassMetaspaceSize)); |
da91efe96a93
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diff
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|
2515 _class_space_list = new VirtualSpaceList(rs); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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diff
changeset
|
2516 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
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|
2517 |
da91efe96a93
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diff
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|
2518 |
da91efe96a93
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diff
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|
2519 void Metaspace::initialize(Mutex* lock, size_t initial_size) { |
6736
11fb740ce98f
7196103: NPG: Unable to allocate bit map for parallel garbage collection for the requested heap size
coleenp
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6734
diff
changeset
|
2520 // Use SmallChunk size if not specified. If specified, use this size for |
11fb740ce98f
7196103: NPG: Unable to allocate bit map for parallel garbage collection for the requested heap size
coleenp
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6734
diff
changeset
|
2521 // the data metaspace. |
6725
da91efe96a93
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coleenp
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diff
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|
2522 size_t word_size; |
da91efe96a93
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diff
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|
2523 size_t class_word_size; |
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coleenp
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diff
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|
2524 if (initial_size == 0) { |
da91efe96a93
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coleenp
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diff
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|
2525 word_size = (size_t) SpaceManager::SmallChunk; |
6736
11fb740ce98f
7196103: NPG: Unable to allocate bit map for parallel garbage collection for the requested heap size
coleenp
parents:
6734
diff
changeset
|
2526 class_word_size = (size_t) SpaceManager::SmallChunk; |
6725
da91efe96a93
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coleenp
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diff
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|
2527 } else { |
da91efe96a93
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diff
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|
2528 word_size = initial_size; |
6736
11fb740ce98f
7196103: NPG: Unable to allocate bit map for parallel garbage collection for the requested heap size
coleenp
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6734
diff
changeset
|
2529 // Make the first class chunk bigger than a medium chunk so it's not put |
11fb740ce98f
7196103: NPG: Unable to allocate bit map for parallel garbage collection for the requested heap size
coleenp
parents:
6734
diff
changeset
|
2530 // on the medium chunk list. The next chunk will be small and progress |
11fb740ce98f
7196103: NPG: Unable to allocate bit map for parallel garbage collection for the requested heap size
coleenp
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6734
diff
changeset
|
2531 // from there. This size calculated by -version. |
11fb740ce98f
7196103: NPG: Unable to allocate bit map for parallel garbage collection for the requested heap size
coleenp
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6734
diff
changeset
|
2532 class_word_size = MIN2((size_t)SpaceManager::MediumChunk*5, |
11fb740ce98f
7196103: NPG: Unable to allocate bit map for parallel garbage collection for the requested heap size
coleenp
parents:
6734
diff
changeset
|
2533 (ClassMetaspaceSize/BytesPerWord)*2); |
6725
da91efe96a93
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coleenp
parents:
diff
changeset
|
2534 } |
da91efe96a93
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coleenp
parents:
diff
changeset
|
2535 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
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|
2536 assert(space_list() != NULL, |
da91efe96a93
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coleenp
parents:
diff
changeset
|
2537 "Metadata VirtualSpaceList has not been initialized"); |
da91efe96a93
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coleenp
parents:
diff
changeset
|
2538 |
da91efe96a93
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coleenp
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diff
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|
2539 _vsm = new SpaceManager(lock, space_list()); |
da91efe96a93
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coleenp
parents:
diff
changeset
|
2540 if (_vsm == NULL) { |
da91efe96a93
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coleenp
parents:
diff
changeset
|
2541 return; |
da91efe96a93
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coleenp
parents:
diff
changeset
|
2542 } |
da91efe96a93
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coleenp
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|
2543 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2544 assert(class_space_list() != NULL, |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2545 "Class VirtualSpaceList has not been initialized"); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2546 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2547 // Allocate SpaceManager for classes. |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2548 _class_vsm = new SpaceManager(lock, class_space_list()); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2549 if (_class_vsm == NULL) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2550 return; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2551 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2552 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2553 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2554 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2555 // Allocate chunk for metadata objects |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2556 Metachunk* new_chunk = |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2557 space_list()->current_virtual_space()->get_chunk_vs_with_expand(word_size); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2558 assert(!DumpSharedSpaces || new_chunk != NULL, "should have enough space for both chunks"); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2559 if (new_chunk != NULL) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2560 // Add to this manager's list of chunks in use and current_chunk(). |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2561 vsm()->add_chunk(new_chunk, true); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2562 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2563 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2564 // Allocate chunk for class metadata objects |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2565 Metachunk* class_chunk = |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2566 class_space_list()->current_virtual_space()->get_chunk_vs_with_expand(class_word_size); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2567 if (class_chunk != NULL) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2568 class_vsm()->add_chunk(class_chunk, true); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2569 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2570 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2571 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2572 MetaWord* Metaspace::allocate(size_t word_size, MetadataType mdtype) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2573 // DumpSharedSpaces doesn't use class metadata area (yet) |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2574 if (mdtype == ClassType && !DumpSharedSpaces) { |
6885 | 2575 return class_vsm()->allocate(word_size); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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parents:
diff
changeset
|
2576 } else { |
6885 | 2577 return vsm()->allocate(word_size); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2578 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2579 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2580 |
6753
8da5e203b993
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
6736
diff
changeset
|
2581 MetaWord* Metaspace::expand_and_allocate(size_t word_size, MetadataType mdtype) { |
8da5e203b993
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
6736
diff
changeset
|
2582 MetaWord* result; |
8da5e203b993
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
6736
diff
changeset
|
2583 MetaspaceGC::set_expand_after_GC(true); |
8da5e203b993
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
6736
diff
changeset
|
2584 size_t before_inc = MetaspaceGC::capacity_until_GC(); |
8da5e203b993
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
6736
diff
changeset
|
2585 size_t delta_words = MetaspaceGC::delta_capacity_until_GC(word_size); |
8da5e203b993
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
6736
diff
changeset
|
2586 MetaspaceGC::inc_capacity_until_GC(delta_words); |
8da5e203b993
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
6736
diff
changeset
|
2587 if (PrintGCDetails && Verbose) { |
8da5e203b993
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
6736
diff
changeset
|
2588 gclog_or_tty->print_cr("Increase capacity to GC from " SIZE_FORMAT |
8da5e203b993
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
6736
diff
changeset
|
2589 " to " SIZE_FORMAT, before_inc, MetaspaceGC::capacity_until_GC()); |
8da5e203b993
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
6736
diff
changeset
|
2590 } |
6885 | 2591 |
6753
8da5e203b993
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
6736
diff
changeset
|
2592 result = allocate(word_size, mdtype); |
8da5e203b993
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
6736
diff
changeset
|
2593 |
8da5e203b993
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
6736
diff
changeset
|
2594 return result; |
8da5e203b993
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
6736
diff
changeset
|
2595 } |
8da5e203b993
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
6736
diff
changeset
|
2596 |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2597 // Space allocated in the Metaspace. This may |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2598 // be across several metadata virtual spaces. |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2599 char* Metaspace::bottom() const { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2600 assert(DumpSharedSpaces, "only useful and valid for dumping shared spaces"); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2601 return (char*)vsm()->current_chunk()->bottom(); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2602 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2603 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2604 size_t Metaspace::used_words(MetadataType mdtype) const { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2605 // return vsm()->allocation_total(); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2606 return mdtype == ClassType ? class_vsm()->sum_used_in_chunks_in_use() : |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2607 vsm()->sum_used_in_chunks_in_use(); // includes overhead! |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2608 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2609 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2610 size_t Metaspace::free_words(MetadataType mdtype) const { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2611 return mdtype == ClassType ? class_vsm()->sum_free_in_chunks_in_use() : |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2612 vsm()->sum_free_in_chunks_in_use(); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2613 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2614 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2615 // Space capacity in the Metaspace. It includes |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2616 // space in the list of chunks from which allocations |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2617 // have been made. Don't include space in the global freelist and |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2618 // in the space available in the dictionary which |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2619 // is already counted in some chunk. |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2620 size_t Metaspace::capacity_words(MetadataType mdtype) const { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2621 return mdtype == ClassType ? class_vsm()->sum_capacity_in_chunks_in_use() : |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2622 vsm()->sum_capacity_in_chunks_in_use(); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2623 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2624 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2625 void Metaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2626 if (SafepointSynchronize::is_at_safepoint()) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2627 assert(Thread::current()->is_VM_thread(), "should be the VM thread"); |
6885 | 2628 // Don't take Heap_lock |
2629 MutexLocker ml(vsm()->lock()); | |
2630 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) { | |
2631 // Dark matter. Too small for dictionary. | |
2632 #ifdef ASSERT | |
2633 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5); | |
2634 #endif | |
2635 return; | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2636 } |
6885 | 2637 if (is_class) { |
2638 class_vsm()->deallocate(ptr, word_size); | |
2639 } else { | |
2640 vsm()->deallocate(ptr, word_size); | |
2641 } | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2642 } else { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2643 MutexLocker ml(vsm()->lock()); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2644 |
6885 | 2645 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) { |
2646 // Dark matter. Too small for dictionary. | |
2647 #ifdef ASSERT | |
2648 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5); | |
2649 #endif | |
2650 return; | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2651 } |
6885 | 2652 if (is_class) { |
2653 class_vsm()->deallocate(ptr, word_size); | |
2654 } else { | |
2655 vsm()->deallocate(ptr, word_size); | |
2656 } | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2657 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2658 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2659 |
6885 | 2660 Metablock* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size, |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2661 bool read_only, MetadataType mdtype, TRAPS) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2662 if (HAS_PENDING_EXCEPTION) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2663 assert(false, "Should not allocate with exception pending"); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2664 return NULL; // caller does a CHECK_NULL too |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2665 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2666 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2667 // SSS: Should we align the allocations and make sure the sizes are aligned. |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2668 MetaWord* result = NULL; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2669 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2670 assert(loader_data != NULL, "Should never pass around a NULL loader_data. " |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2671 "ClassLoaderData::the_null_class_loader_data() should have been used."); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2672 // Allocate in metaspaces without taking out a lock, because it deadlocks |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2673 // with the SymbolTable_lock. Dumping is single threaded for now. We'll have |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2674 // to revisit this for application class data sharing. |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2675 if (DumpSharedSpaces) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2676 if (read_only) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2677 result = loader_data->ro_metaspace()->allocate(word_size, NonClassType); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2678 } else { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2679 result = loader_data->rw_metaspace()->allocate(word_size, NonClassType); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2680 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2681 if (result == NULL) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2682 report_out_of_shared_space(read_only ? SharedReadOnly : SharedReadWrite); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2683 } |
6885 | 2684 return Metablock::initialize(result, word_size); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2685 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2686 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2687 result = loader_data->metaspace_non_null()->allocate(word_size, mdtype); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2688 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2689 if (result == NULL) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2690 // Try to clean out some memory and retry. |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2691 result = |
6885 | 2692 Universe::heap()->collector_policy()->satisfy_failed_metadata_allocation( |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2693 loader_data, word_size, mdtype); |
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2694 |
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2695 // If result is still null, we are out of memory. |
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2696 if (result == NULL) { |
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2697 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support |
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2698 report_java_out_of_memory("Metadata space"); |
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2699 |
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2700 if (JvmtiExport::should_post_resource_exhausted()) { |
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2701 JvmtiExport::post_resource_exhausted( |
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2702 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR, |
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2703 "Metadata space"); |
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2704 } |
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2705 THROW_OOP_0(Universe::out_of_memory_error_perm_gen()); |
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2706 } |
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2707 } |
6885 | 2708 return Metablock::initialize(result, word_size); |
6725
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2709 } |
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2710 |
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2711 void Metaspace::print_on(outputStream* out) const { |
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2712 // Print both class virtual space counts and metaspace. |
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2713 if (Verbose) { |
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2714 vsm()->print_on(out); |
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2715 class_vsm()->print_on(out); |
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2716 } |
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2717 } |
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2718 |
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2719 #ifndef PRODUCT |
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2720 bool Metaspace::contains(const void * ptr) const { |
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2721 if (MetaspaceShared::is_in_shared_space(ptr)) { |
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2722 return true; |
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2723 } |
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2724 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag); |
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2725 return space_list()->contains(ptr) || class_space_list()->contains(ptr); |
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2726 } |
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2727 #endif |
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2728 |
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2729 void Metaspace::verify() { |
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2730 vsm()->verify(); |
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2731 class_vsm()->verify(); |
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2732 } |
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2733 |
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2734 void Metaspace::dump(outputStream* const out) const { |
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2735 if (UseMallocOnly) { |
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2736 // Just print usage for now |
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2737 out->print_cr("usage %d", used_words(Metaspace::NonClassType)); |
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2738 } |
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2739 out->print_cr("\nVirtual space manager: " INTPTR_FORMAT, vsm()); |
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2740 vsm()->dump(out); |
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2741 out->print_cr("\nClass space manager: " INTPTR_FORMAT, class_vsm()); |
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2742 class_vsm()->dump(out); |
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2743 } |