Mercurial > hg > truffle
annotate src/share/vm/memory/metaspace.cpp @ 7185:90273fc0a981
8000662: NPG: nashorn ant clean test262 out-of-memory with Java heap
Summary: Add ClassLoaderData object for each anonymous class with metaspaces to allocate in.
Reviewed-by: twisti, jrose, stefank
author | coleenp |
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date | Thu, 29 Nov 2012 16:50:29 -0500 |
parents | 6bc207d87e5d |
children | 5fafdef522c6 |
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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 // Define this macro to enable slow integrity checking of |
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46 // the free chunk lists |
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47 const bool metaspace_slow_verify = false; |
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48 |
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49 |
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50 // Parameters for stress mode testing |
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51 const uint metadata_deallocate_a_lot_block = 10; |
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52 const uint metadata_deallocate_a_lock_chunk = 3; |
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53 size_t const allocation_from_dictionary_limit = 64 * K; |
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54 const size_t metadata_chunk_initialize = 0xf7f7f7f7; |
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55 const size_t metadata_deallocate = 0xf5f5f5f5; |
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56 |
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57 MetaWord* last_allocated = 0; |
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58 |
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59 // Used in declarations in SpaceManager and ChunkManager |
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60 enum ChunkIndex { |
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61 SmallIndex = 0, |
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62 MediumIndex = 1, |
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63 HumongousIndex = 2, |
6885 | 64 NumberOfFreeLists = 2, |
65 NumberOfInUseLists = 3 | |
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66 }; |
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67 |
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68 static ChunkIndex next_chunk_index(ChunkIndex i) { |
6885 | 69 assert(i < NumberOfInUseLists, "Out of bound"); |
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70 return (ChunkIndex) (i+1); |
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71 } |
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72 |
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73 // Originally _capacity_until_GC was set to MetaspaceSize here but |
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74 // the default MetaspaceSize before argument processing was being |
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75 // used which was not the desired value. See the code |
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76 // in should_expand() to see how the initialization is handled |
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77 // now. |
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78 size_t MetaspaceGC::_capacity_until_GC = 0; |
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79 bool MetaspaceGC::_expand_after_GC = false; |
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80 uint MetaspaceGC::_shrink_factor = 0; |
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81 bool MetaspaceGC::_should_concurrent_collect = false; |
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82 |
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83 // Blocks of space for metadata are allocated out of Metachunks. |
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84 // |
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85 // Metachunk are allocated out of MetadataVirtualspaces and once |
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86 // allocated there is no explicit link between a Metachunk and |
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87 // the MetadataVirtualspaces from which it was allocated. |
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88 // |
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89 // Each SpaceManager maintains a |
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90 // list of the chunks it is using and the current chunk. The current |
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91 // chunk is the chunk from which allocations are done. Space freed in |
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92 // a chunk is placed on the free list of blocks (BlockFreelist) and |
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93 // reused from there. |
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94 // |
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95 // Future modification |
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96 // |
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97 // The Metachunk can conceivable be replaced by the Chunk in |
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98 // allocation.hpp. Note that the latter Chunk is the space for |
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99 // allocation (allocations from the chunk are out of the space in |
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100 // the Chunk after the header for the Chunk) where as Metachunks |
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101 // point to space in a VirtualSpace. To replace Metachunks with |
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102 // Chunks, change Chunks so that they can be allocated out of a VirtualSpace. |
6885 | 103 size_t Metablock::_min_block_byte_size = sizeof(Metablock); |
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104 #ifdef ASSERT |
6885 | 105 size_t Metablock::_overhead = |
106 Chunk::aligned_overhead_size(sizeof(Metablock)) / BytesPerWord; | |
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107 #else |
6885 | 108 size_t Metablock::_overhead = 0; |
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109 #endif |
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110 |
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111 // Pointer to list of Metachunks. |
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112 class ChunkList VALUE_OBJ_CLASS_SPEC { |
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113 // List of free chunks |
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114 Metachunk* _head; |
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115 |
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116 public: |
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117 // Constructor |
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118 ChunkList() : _head(NULL) {} |
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119 |
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120 // Accessors |
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121 Metachunk* head() { return _head; } |
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122 void set_head(Metachunk* v) { _head = v; } |
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123 |
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124 // Link at head of the list |
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125 void add_at_head(Metachunk* head, Metachunk* tail); |
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126 void add_at_head(Metachunk* head); |
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127 |
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128 size_t sum_list_size(); |
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129 size_t sum_list_count(); |
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130 size_t sum_list_capacity(); |
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131 }; |
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132 |
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133 // Manages the global free lists of chunks. |
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134 // Has three lists of free chunks, and a total size and |
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135 // count that includes all three |
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136 |
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137 class ChunkManager VALUE_OBJ_CLASS_SPEC { |
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138 |
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139 // Free list of chunks of different sizes. |
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140 // SmallChunk |
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141 // MediumChunk |
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142 // HumongousChunk |
6885 | 143 ChunkList _free_chunks[NumberOfFreeLists]; |
144 | |
145 // HumongousChunk | |
146 ChunkTreeDictionary _humongous_dictionary; | |
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147 |
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148 // ChunkManager in all lists of this type |
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149 size_t _free_chunks_total; |
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150 size_t _free_chunks_count; |
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151 |
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152 void dec_free_chunks_total(size_t v) { |
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153 assert(_free_chunks_count > 0 && |
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154 _free_chunks_total > 0, |
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155 "About to go negative"); |
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156 Atomic::add_ptr(-1, &_free_chunks_count); |
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157 jlong minus_v = (jlong) - (jlong) v; |
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158 Atomic::add_ptr(minus_v, &_free_chunks_total); |
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159 } |
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160 |
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161 // Debug support |
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162 |
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163 size_t sum_free_chunks(); |
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164 size_t sum_free_chunks_count(); |
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165 |
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166 void locked_verify_free_chunks_total(); |
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167 void slow_locked_verify_free_chunks_total() { |
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168 if (metaspace_slow_verify) { |
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169 locked_verify_free_chunks_total(); |
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170 } |
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171 } |
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172 void locked_verify_free_chunks_count(); |
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173 void slow_locked_verify_free_chunks_count() { |
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174 if (metaspace_slow_verify) { |
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175 locked_verify_free_chunks_count(); |
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176 } |
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177 } |
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178 void verify_free_chunks_count(); |
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179 |
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180 public: |
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181 |
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182 ChunkManager() : _free_chunks_total(0), _free_chunks_count(0) {} |
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183 |
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184 // add or delete (return) a chunk to the global freelist. |
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185 Metachunk* chunk_freelist_allocate(size_t word_size); |
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186 void chunk_freelist_deallocate(Metachunk* chunk); |
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187 |
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188 // Total of the space in the free chunks list |
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189 size_t free_chunks_total(); |
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190 size_t free_chunks_total_in_bytes(); |
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191 |
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192 // Number of chunks in the free chunks list |
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193 size_t free_chunks_count(); |
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194 |
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195 void inc_free_chunks_total(size_t v, size_t count = 1) { |
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196 Atomic::add_ptr(count, &_free_chunks_count); |
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197 Atomic::add_ptr(v, &_free_chunks_total); |
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198 } |
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199 ChunkList* free_medium_chunks() { return &_free_chunks[1]; } |
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200 ChunkList* free_small_chunks() { return &_free_chunks[0]; } |
6885 | 201 ChunkTreeDictionary* humongous_dictionary() { |
202 return &_humongous_dictionary; | |
203 } | |
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204 |
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205 ChunkList* free_chunks(ChunkIndex index); |
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206 |
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207 // Returns the list for the given chunk word size. |
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208 ChunkList* find_free_chunks_list(size_t word_size); |
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209 |
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210 // Add and remove from a list by size. Selects |
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211 // list based on size of chunk. |
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212 void free_chunks_put(Metachunk* chuck); |
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213 Metachunk* free_chunks_get(size_t chunk_word_size); |
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214 |
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215 // Debug support |
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216 void verify(); |
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217 void slow_verify() { |
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218 if (metaspace_slow_verify) { |
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219 verify(); |
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220 } |
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221 } |
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222 void locked_verify(); |
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223 void slow_locked_verify() { |
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224 if (metaspace_slow_verify) { |
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225 locked_verify(); |
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226 } |
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227 } |
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228 void verify_free_chunks_total(); |
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229 |
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230 void locked_print_free_chunks(outputStream* st); |
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231 void locked_print_sum_free_chunks(outputStream* st); |
6885 | 232 |
233 void print_on(outputStream* st); | |
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234 }; |
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235 |
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236 |
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237 // Used to manage the free list of Metablocks (a block corresponds |
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238 // to the allocation of a quantum of metadata). |
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239 class BlockFreelist VALUE_OBJ_CLASS_SPEC { |
6885 | 240 BlockTreeDictionary* _dictionary; |
241 static Metablock* initialize_free_chunk(MetaWord* p, size_t word_size); | |
242 | |
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243 // Accessors |
6885 | 244 BlockTreeDictionary* dictionary() const { return _dictionary; } |
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245 |
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246 public: |
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247 BlockFreelist(); |
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248 ~BlockFreelist(); |
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249 |
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250 // Get and return a block to the free list |
6885 | 251 MetaWord* get_block(size_t word_size); |
252 void return_block(MetaWord* p, size_t word_size); | |
253 | |
254 size_t total_size() { | |
255 if (dictionary() == NULL) { | |
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256 return 0; |
6885 | 257 } else { |
258 return dictionary()->total_size(); | |
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259 } |
6885 | 260 } |
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261 |
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262 void print_on(outputStream* st) const; |
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263 }; |
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264 |
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265 class VirtualSpaceNode : public CHeapObj<mtClass> { |
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266 friend class VirtualSpaceList; |
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267 |
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268 // Link to next VirtualSpaceNode |
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269 VirtualSpaceNode* _next; |
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270 |
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271 // total in the VirtualSpace |
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272 MemRegion _reserved; |
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273 ReservedSpace _rs; |
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274 VirtualSpace _virtual_space; |
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275 MetaWord* _top; |
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276 |
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277 // Convenience functions for logical bottom and end |
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278 MetaWord* bottom() const { return (MetaWord*) _virtual_space.low(); } |
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279 MetaWord* end() const { return (MetaWord*) _virtual_space.high(); } |
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280 |
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281 // Convenience functions to access the _virtual_space |
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282 char* low() const { return virtual_space()->low(); } |
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283 char* high() const { return virtual_space()->high(); } |
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284 |
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285 public: |
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286 |
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287 VirtualSpaceNode(size_t byte_size); |
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288 VirtualSpaceNode(ReservedSpace rs) : _top(NULL), _next(NULL), _rs(rs) {} |
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289 ~VirtualSpaceNode(); |
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290 |
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291 // address of next available space in _virtual_space; |
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292 // Accessors |
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293 VirtualSpaceNode* next() { return _next; } |
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294 void set_next(VirtualSpaceNode* v) { _next = v; } |
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295 |
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296 void set_reserved(MemRegion const v) { _reserved = v; } |
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297 void set_top(MetaWord* v) { _top = v; } |
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298 |
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299 // Accessors |
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300 MemRegion* reserved() { return &_reserved; } |
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301 VirtualSpace* virtual_space() const { return (VirtualSpace*) &_virtual_space; } |
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302 |
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303 // Returns true if "word_size" is available in the virtual space |
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304 bool is_available(size_t word_size) { return _top + word_size <= end(); } |
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305 |
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306 MetaWord* top() const { return _top; } |
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307 void inc_top(size_t word_size) { _top += word_size; } |
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308 |
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309 // used and capacity in this single entry in the list |
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310 size_t used_words_in_vs() const; |
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311 size_t capacity_words_in_vs() const; |
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312 |
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313 bool initialize(); |
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314 |
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315 // get space from the virtual space |
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316 Metachunk* take_from_committed(size_t chunk_word_size); |
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317 |
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318 // Allocate a chunk from the virtual space and return it. |
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319 Metachunk* get_chunk_vs(size_t chunk_word_size); |
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320 Metachunk* get_chunk_vs_with_expand(size_t chunk_word_size); |
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321 |
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322 // Expands/shrinks the committed space in a virtual space. Delegates |
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323 // to Virtualspace |
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324 bool expand_by(size_t words, bool pre_touch = false); |
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325 bool shrink_by(size_t words); |
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326 |
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327 #ifdef ASSERT |
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328 // Debug support |
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329 static void verify_virtual_space_total(); |
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330 static void verify_virtual_space_count(); |
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331 void mangle(); |
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332 #endif |
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333 |
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334 void print_on(outputStream* st) const; |
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335 }; |
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336 |
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337 // byte_size is the size of the associated virtualspace. |
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338 VirtualSpaceNode::VirtualSpaceNode(size_t byte_size) : _top(NULL), _next(NULL), _rs(0) { |
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339 // This allocates memory with mmap. For DumpSharedspaces, allocate the |
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340 // space at low memory so that other shared images don't conflict. |
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341 // This is the same address as memory needed for UseCompressedOops but |
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342 // compressed oops don't work with CDS (offsets in metadata are wrong), so |
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343 // borrow the same address. |
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344 if (DumpSharedSpaces) { |
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345 char* shared_base = (char*)HeapBaseMinAddress; |
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346 _rs = ReservedSpace(byte_size, 0, false, shared_base, 0); |
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347 if (_rs.is_reserved()) { |
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348 assert(_rs.base() == shared_base, "should match"); |
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349 } else { |
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350 // If we are dumping the heap, then allocate a wasted block of address |
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351 // space in order to push the heap to a lower address. This extra |
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352 // address range allows for other (or larger) libraries to be loaded |
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353 // without them occupying the space required for the shared spaces. |
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354 uintx reserved = 0; |
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355 uintx block_size = 64*1024*1024; |
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356 while (reserved < SharedDummyBlockSize) { |
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357 char* dummy = os::reserve_memory(block_size); |
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358 reserved += block_size; |
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359 } |
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360 _rs = ReservedSpace(byte_size); |
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361 } |
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362 MetaspaceShared::set_shared_rs(&_rs); |
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363 } else { |
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364 _rs = ReservedSpace(byte_size); |
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365 } |
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366 |
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367 MemTracker::record_virtual_memory_type((address)_rs.base(), mtClass); |
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368 } |
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369 |
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370 // List of VirtualSpaces for metadata allocation. |
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371 // It has a _next link for singly linked list and a MemRegion |
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372 // for total space in the VirtualSpace. |
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373 class VirtualSpaceList : public CHeapObj<mtClass> { |
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374 friend class VirtualSpaceNode; |
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375 |
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376 enum VirtualSpaceSizes { |
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377 VirtualSpaceSize = 256 * K |
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378 }; |
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379 |
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380 // Global list of virtual spaces |
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381 // Head of the list |
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382 VirtualSpaceNode* _virtual_space_list; |
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383 // virtual space currently being used for allocations |
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384 VirtualSpaceNode* _current_virtual_space; |
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385 // Free chunk list for all other metadata |
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386 ChunkManager _chunk_manager; |
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387 |
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388 // Can this virtual list allocate >1 spaces? Also, used to determine |
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389 // whether to allocate unlimited small chunks in this virtual space |
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390 bool _is_class; |
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391 bool can_grow() const { return !is_class() || !UseCompressedKlassPointers; } |
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392 |
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393 // Sum of space in all virtual spaces and number of virtual spaces |
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394 size_t _virtual_space_total; |
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395 size_t _virtual_space_count; |
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396 |
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397 ~VirtualSpaceList(); |
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398 |
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399 VirtualSpaceNode* virtual_space_list() const { return _virtual_space_list; } |
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400 |
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401 void set_virtual_space_list(VirtualSpaceNode* v) { |
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402 _virtual_space_list = v; |
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403 } |
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404 void set_current_virtual_space(VirtualSpaceNode* v) { |
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405 _current_virtual_space = v; |
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406 } |
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407 |
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408 void link_vs(VirtualSpaceNode* new_entry, size_t vs_word_size); |
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409 |
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410 // Get another virtual space and add it to the list. This |
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411 // is typically prompted by a failed attempt to allocate a chunk |
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412 // and is typically followed by the allocation of a chunk. |
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413 bool grow_vs(size_t vs_word_size); |
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414 |
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415 public: |
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416 VirtualSpaceList(size_t word_size); |
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417 VirtualSpaceList(ReservedSpace rs); |
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418 |
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419 Metachunk* get_new_chunk(size_t word_size, size_t grow_chunks_by_words); |
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420 |
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421 VirtualSpaceNode* current_virtual_space() { |
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422 return _current_virtual_space; |
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423 } |
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424 |
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425 ChunkManager* chunk_manager() { return &_chunk_manager; } |
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426 bool is_class() const { return _is_class; } |
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427 |
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428 // Allocate the first virtualspace. |
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429 void initialize(size_t word_size); |
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430 |
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431 size_t virtual_space_total() { return _virtual_space_total; } |
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432 void inc_virtual_space_total(size_t v) { |
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433 Atomic::add_ptr(v, &_virtual_space_total); |
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434 } |
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435 |
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436 size_t virtual_space_count() { return _virtual_space_count; } |
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437 void inc_virtual_space_count() { |
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438 Atomic::inc_ptr(&_virtual_space_count); |
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439 } |
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440 |
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441 // Used and capacity in the entire list of virtual spaces. |
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442 // These are global values shared by all Metaspaces |
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443 size_t capacity_words_sum(); |
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444 size_t capacity_bytes_sum() { return capacity_words_sum() * BytesPerWord; } |
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445 size_t used_words_sum(); |
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446 size_t used_bytes_sum() { return used_words_sum() * BytesPerWord; } |
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447 |
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448 bool contains(const void *ptr); |
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449 |
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450 void print_on(outputStream* st) const; |
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451 |
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452 class VirtualSpaceListIterator : public StackObj { |
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453 VirtualSpaceNode* _virtual_spaces; |
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454 public: |
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455 VirtualSpaceListIterator(VirtualSpaceNode* virtual_spaces) : |
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456 _virtual_spaces(virtual_spaces) {} |
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457 |
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458 bool repeat() { |
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459 return _virtual_spaces != NULL; |
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460 } |
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461 |
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462 VirtualSpaceNode* get_next() { |
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463 VirtualSpaceNode* result = _virtual_spaces; |
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464 if (_virtual_spaces != NULL) { |
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465 _virtual_spaces = _virtual_spaces->next(); |
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466 } |
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467 return result; |
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468 } |
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469 }; |
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470 }; |
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471 |
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472 class Metadebug : AllStatic { |
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473 // Debugging support for Metaspaces |
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474 static int _deallocate_block_a_lot_count; |
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475 static int _deallocate_chunk_a_lot_count; |
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476 static int _allocation_fail_alot_count; |
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477 |
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478 public: |
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479 static int deallocate_block_a_lot_count() { |
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480 return _deallocate_block_a_lot_count; |
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481 } |
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482 static void set_deallocate_block_a_lot_count(int v) { |
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483 _deallocate_block_a_lot_count = v; |
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484 } |
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485 static void inc_deallocate_block_a_lot_count() { |
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486 _deallocate_block_a_lot_count++; |
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487 } |
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488 static int deallocate_chunk_a_lot_count() { |
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489 return _deallocate_chunk_a_lot_count; |
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490 } |
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491 static void reset_deallocate_chunk_a_lot_count() { |
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492 _deallocate_chunk_a_lot_count = 1; |
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493 } |
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494 static void inc_deallocate_chunk_a_lot_count() { |
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495 _deallocate_chunk_a_lot_count++; |
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496 } |
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497 |
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498 static void init_allocation_fail_alot_count(); |
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499 #ifdef ASSERT |
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500 static bool test_metadata_failure(); |
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501 #endif |
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502 |
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503 static void deallocate_chunk_a_lot(SpaceManager* sm, |
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504 size_t chunk_word_size); |
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505 static void deallocate_block_a_lot(SpaceManager* sm, |
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506 size_t chunk_word_size); |
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507 |
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508 }; |
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509 |
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510 int Metadebug::_deallocate_block_a_lot_count = 0; |
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511 int Metadebug::_deallocate_chunk_a_lot_count = 0; |
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512 int Metadebug::_allocation_fail_alot_count = 0; |
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513 |
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514 // SpaceManager - used by Metaspace to handle allocations |
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515 class SpaceManager : public CHeapObj<mtClass> { |
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516 friend class Metaspace; |
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517 friend class Metadebug; |
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518 |
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519 private: |
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520 // protects allocations and contains. |
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521 Mutex* const _lock; |
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522 |
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523 // List of chunks in use by this SpaceManager. Allocations |
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524 // are done from the current chunk. The list is used for deallocating |
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525 // chunks when the SpaceManager is freed. |
6885 | 526 Metachunk* _chunks_in_use[NumberOfInUseLists]; |
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527 Metachunk* _current_chunk; |
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528 |
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529 // Virtual space where allocation comes from. |
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530 VirtualSpaceList* _vs_list; |
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531 |
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532 // Number of small chunks to allocate to a manager |
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533 // If class space manager, small chunks are unlimited |
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534 static uint const _small_chunk_limit; |
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535 bool has_small_chunk_limit() { return !vs_list()->is_class(); } |
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536 |
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537 // Sum of all space in allocated chunks |
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538 size_t _allocation_total; |
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539 |
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540 // Free lists of blocks are per SpaceManager since they |
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541 // are assumed to be in chunks in use by the SpaceManager |
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542 // and all chunks in use by a SpaceManager are freed when |
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543 // the class loader using the SpaceManager is collected. |
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544 BlockFreelist _block_freelists; |
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545 |
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546 // protects virtualspace and chunk expansions |
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547 static const char* _expand_lock_name; |
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548 static const int _expand_lock_rank; |
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549 static Mutex* const _expand_lock; |
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550 |
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551 // Accessors |
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552 Metachunk* chunks_in_use(ChunkIndex index) const { return _chunks_in_use[index]; } |
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553 void set_chunks_in_use(ChunkIndex index, Metachunk* v) { _chunks_in_use[index] = v; } |
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554 |
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555 BlockFreelist* block_freelists() const { |
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556 return (BlockFreelist*) &_block_freelists; |
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557 } |
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558 |
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559 VirtualSpaceList* vs_list() const { return _vs_list; } |
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560 |
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561 Metachunk* current_chunk() const { return _current_chunk; } |
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562 void set_current_chunk(Metachunk* v) { |
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563 _current_chunk = v; |
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564 } |
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565 |
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566 Metachunk* find_current_chunk(size_t word_size); |
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567 |
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568 // Add chunk to the list of chunks in use |
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569 void add_chunk(Metachunk* v, bool make_current); |
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570 |
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571 Mutex* lock() const { return _lock; } |
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572 |
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573 public: |
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574 SpaceManager(Mutex* lock, VirtualSpaceList* vs_list); |
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575 ~SpaceManager(); |
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576 |
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577 enum ChunkSizes { // in words. |
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578 SmallChunk = 512, |
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579 MediumChunk = 8 * K, |
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580 MediumChunkBunch = 4 * MediumChunk |
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581 }; |
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582 |
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583 // Accessors |
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584 size_t allocation_total() const { return _allocation_total; } |
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585 void inc_allocation_total(size_t v) { Atomic::add_ptr(v, &_allocation_total); } |
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586 static bool is_humongous(size_t word_size) { return word_size > MediumChunk; } |
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587 |
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588 static Mutex* expand_lock() { return _expand_lock; } |
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589 |
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590 size_t sum_capacity_in_chunks_in_use() const; |
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591 size_t sum_used_in_chunks_in_use() const; |
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592 size_t sum_free_in_chunks_in_use() const; |
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593 size_t sum_waste_in_chunks_in_use() const; |
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594 size_t sum_waste_in_chunks_in_use(ChunkIndex index ) const; |
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595 |
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596 size_t sum_count_in_chunks_in_use(); |
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597 size_t sum_count_in_chunks_in_use(ChunkIndex i); |
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598 |
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599 // Block allocation and deallocation. |
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600 // Allocates a block from the current chunk |
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601 MetaWord* allocate(size_t word_size); |
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602 |
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603 // Helper for allocations |
6885 | 604 MetaWord* allocate_work(size_t word_size); |
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605 |
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606 // Returns a block to the per manager freelist |
6885 | 607 void deallocate(MetaWord* p, size_t word_size); |
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608 |
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609 // Based on the allocation size and a minimum chunk size, |
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610 // returned chunk size (for expanding space for chunk allocation). |
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611 size_t calc_chunk_size(size_t allocation_word_size); |
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612 |
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613 // Called when an allocation from the current chunk fails. |
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614 // Gets a new chunk (may require getting a new virtual space), |
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615 // and allocates from that chunk. |
6885 | 616 MetaWord* grow_and_allocate(size_t word_size); |
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617 |
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618 // debugging support. |
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619 |
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620 void dump(outputStream* const out) const; |
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621 void print_on(outputStream* st) const; |
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622 void locked_print_chunks_in_use_on(outputStream* st) const; |
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623 |
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624 void verify(); |
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625 NOT_PRODUCT(void mangle_freed_chunks();) |
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626 #ifdef ASSERT |
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627 void verify_allocation_total(); |
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628 #endif |
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629 }; |
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630 |
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631 uint const SpaceManager::_small_chunk_limit = 4; |
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632 |
6885 | 633 |
634 | |
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635 const char* SpaceManager::_expand_lock_name = |
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636 "SpaceManager chunk allocation lock"; |
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637 const int SpaceManager::_expand_lock_rank = Monitor::leaf - 1; |
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638 Mutex* const SpaceManager::_expand_lock = |
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639 new Mutex(SpaceManager::_expand_lock_rank, |
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640 SpaceManager::_expand_lock_name, |
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641 Mutex::_allow_vm_block_flag); |
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642 |
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643 size_t Metachunk::_overhead = |
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644 Chunk::aligned_overhead_size(sizeof(Metachunk)) / BytesPerWord; |
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645 |
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646 // New blocks returned by the Metaspace are zero initialized. |
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647 // We should fix the constructors to not assume this instead. |
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648 Metablock* Metablock::initialize(MetaWord* p, size_t word_size) { |
6885 | 649 if (p == NULL) { |
650 return NULL; | |
651 } | |
652 | |
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653 Metablock* result = (Metablock*) p; |
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654 |
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655 // Clear the memory |
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656 Copy::fill_to_aligned_words((HeapWord*)result, word_size); |
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657 #ifdef ASSERT |
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658 result->set_word_size(word_size); |
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659 #endif |
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660 return result; |
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661 } |
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662 |
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663 // Metachunk methods |
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664 |
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665 Metachunk* Metachunk::initialize(MetaWord* ptr, size_t word_size) { |
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666 // Set bottom, top, and end. Allow space for the Metachunk itself |
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667 Metachunk* chunk = (Metachunk*) ptr; |
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668 |
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669 MetaWord* chunk_bottom = ptr + _overhead; |
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670 chunk->set_bottom(ptr); |
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671 chunk->set_top(chunk_bottom); |
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672 MetaWord* chunk_end = ptr + word_size; |
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673 assert(chunk_end > chunk_bottom, "Chunk must be too small"); |
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674 chunk->set_end(chunk_end); |
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675 chunk->set_next(NULL); |
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676 chunk->set_word_size(word_size); |
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677 #ifdef ASSERT |
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678 size_t data_word_size = pointer_delta(chunk_end, chunk_bottom, sizeof(MetaWord)); |
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679 Copy::fill_to_words((HeapWord*) chunk_bottom, data_word_size, metadata_chunk_initialize); |
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680 #endif |
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681 return chunk; |
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682 } |
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683 |
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684 |
6885 | 685 MetaWord* Metachunk::allocate(size_t word_size) { |
686 MetaWord* result = NULL; | |
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687 // If available, bump the pointer to allocate. |
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688 if (free_word_size() >= word_size) { |
6885 | 689 result = _top; |
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690 _top = _top + word_size; |
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691 } |
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692 return result; |
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693 } |
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694 |
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695 // _bottom points to the start of the chunk including the overhead. |
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696 size_t Metachunk::used_word_size() { |
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697 return pointer_delta(_top, _bottom, sizeof(MetaWord)); |
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698 } |
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699 |
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700 size_t Metachunk::free_word_size() { |
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701 return pointer_delta(_end, _top, sizeof(MetaWord)); |
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702 } |
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703 |
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704 size_t Metachunk::capacity_word_size() { |
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705 return pointer_delta(_end, _bottom, sizeof(MetaWord)); |
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706 } |
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707 |
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708 void Metachunk::print_on(outputStream* st) const { |
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709 st->print_cr("Metachunk:" |
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710 " bottom " PTR_FORMAT " top " PTR_FORMAT |
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711 " end " PTR_FORMAT " size " SIZE_FORMAT, |
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712 bottom(), top(), end(), word_size()); |
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713 } |
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714 |
7185
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715 #ifndef PRODUCT |
6885 | 716 void Metachunk::mangle() { |
717 // Mangle the payload of the chunk and not the links that | |
718 // maintain list of chunks. | |
719 HeapWord* start = (HeapWord*)(bottom() + overhead()); | |
720 size_t word_size = capacity_word_size() - overhead(); | |
721 Copy::fill_to_words(start, word_size, metadata_chunk_initialize); | |
722 } | |
7185
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723 #endif // PRODUCT |
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724 |
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725 void Metachunk::verify() { |
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726 #ifdef ASSERT |
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727 // Cannot walk through the blocks unless the blocks have |
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728 // headers with sizes. |
6885 | 729 assert(_bottom <= _top && |
730 _top <= _end, | |
731 "Chunk has been smashed"); | |
732 assert(SpaceManager::is_humongous(_word_size) || | |
733 _word_size == SpaceManager::MediumChunk || | |
734 _word_size == SpaceManager::SmallChunk, | |
735 "Chunk size is wrong"); | |
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736 #endif |
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737 return; |
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738 } |
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739 |
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740 // BlockFreelist methods |
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741 |
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742 BlockFreelist::BlockFreelist() : _dictionary(NULL) {} |
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743 |
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744 BlockFreelist::~BlockFreelist() { |
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745 if (_dictionary != NULL) { |
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746 if (Verbose && TraceMetadataChunkAllocation) { |
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747 _dictionary->print_free_lists(gclog_or_tty); |
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748 } |
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749 delete _dictionary; |
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750 } |
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751 } |
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752 |
6885 | 753 Metablock* BlockFreelist::initialize_free_chunk(MetaWord* p, size_t word_size) { |
754 Metablock* block = (Metablock*) p; | |
755 block->set_word_size(word_size); | |
756 block->set_prev(NULL); | |
757 block->set_next(NULL); | |
758 | |
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759 return block; |
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760 } |
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761 |
6885 | 762 void BlockFreelist::return_block(MetaWord* p, size_t word_size) { |
763 Metablock* free_chunk = initialize_free_chunk(p, word_size); | |
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764 if (dictionary() == NULL) { |
6885 | 765 _dictionary = new BlockTreeDictionary(); |
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766 } |
6885 | 767 dictionary()->return_chunk(free_chunk); |
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768 } |
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769 |
6885 | 770 MetaWord* BlockFreelist::get_block(size_t word_size) { |
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771 if (dictionary() == NULL) { |
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772 return NULL; |
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773 } |
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774 |
6885 | 775 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) { |
776 // Dark matter. Too small for dictionary. | |
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777 return NULL; |
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778 } |
6885 | 779 |
780 Metablock* free_block = | |
781 dictionary()->get_chunk(word_size, FreeBlockDictionary<Metablock>::exactly); | |
782 if (free_block == NULL) { | |
783 return NULL; | |
784 } | |
785 | |
786 return (MetaWord*) free_block; | |
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787 } |
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788 |
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789 void BlockFreelist::print_on(outputStream* st) const { |
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790 if (dictionary() == NULL) { |
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791 return; |
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792 } |
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793 dictionary()->print_free_lists(st); |
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794 } |
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795 |
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796 // VirtualSpaceNode methods |
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797 |
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798 VirtualSpaceNode::~VirtualSpaceNode() { |
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799 _rs.release(); |
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800 } |
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801 |
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802 size_t VirtualSpaceNode::used_words_in_vs() const { |
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803 return pointer_delta(top(), bottom(), sizeof(MetaWord)); |
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804 } |
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805 |
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806 // Space committed in the VirtualSpace |
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807 size_t VirtualSpaceNode::capacity_words_in_vs() const { |
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808 return pointer_delta(end(), bottom(), sizeof(MetaWord)); |
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809 } |
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810 |
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811 |
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812 // Allocates the chunk from the virtual space only. |
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813 // This interface is also used internally for debugging. Not all |
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814 // chunks removed here are necessarily used for allocation. |
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815 Metachunk* VirtualSpaceNode::take_from_committed(size_t chunk_word_size) { |
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816 // Bottom of the new chunk |
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817 MetaWord* chunk_limit = top(); |
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818 assert(chunk_limit != NULL, "Not safe to call this method"); |
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819 |
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820 if (!is_available(chunk_word_size)) { |
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821 if (TraceMetadataChunkAllocation) { |
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822 tty->print("VirtualSpaceNode::take_from_committed() not available %d words ", chunk_word_size); |
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823 // Dump some information about the virtual space that is nearly full |
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824 print_on(tty); |
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825 } |
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826 return NULL; |
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827 } |
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828 |
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829 // Take the space (bump top on the current virtual space). |
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830 inc_top(chunk_word_size); |
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831 |
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832 // Point the chunk at the space |
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833 Metachunk* result = Metachunk::initialize(chunk_limit, chunk_word_size); |
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834 return result; |
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835 } |
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836 |
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837 |
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838 // Expand the virtual space (commit more of the reserved space) |
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839 bool VirtualSpaceNode::expand_by(size_t words, bool pre_touch) { |
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840 size_t bytes = words * BytesPerWord; |
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841 bool result = virtual_space()->expand_by(bytes, pre_touch); |
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842 if (TraceMetavirtualspaceAllocation && !result) { |
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843 gclog_or_tty->print_cr("VirtualSpaceNode::expand_by() failed " |
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844 "for byte size " SIZE_FORMAT, bytes); |
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845 virtual_space()->print(); |
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846 } |
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847 return result; |
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848 } |
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849 |
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850 // Shrink the virtual space (commit more of the reserved space) |
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851 bool VirtualSpaceNode::shrink_by(size_t words) { |
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852 size_t bytes = words * BytesPerWord; |
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853 virtual_space()->shrink_by(bytes); |
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854 return true; |
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855 } |
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856 |
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857 // Add another chunk to the chunk list. |
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858 |
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859 Metachunk* VirtualSpaceNode::get_chunk_vs(size_t chunk_word_size) { |
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860 assert_lock_strong(SpaceManager::expand_lock()); |
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861 Metachunk* result = NULL; |
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862 |
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863 return take_from_committed(chunk_word_size); |
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864 } |
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865 |
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866 Metachunk* VirtualSpaceNode::get_chunk_vs_with_expand(size_t chunk_word_size) { |
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867 assert_lock_strong(SpaceManager::expand_lock()); |
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868 |
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869 Metachunk* new_chunk = get_chunk_vs(chunk_word_size); |
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870 |
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871 if (new_chunk == NULL) { |
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872 // Only a small part of the virtualspace is committed when first |
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873 // allocated so committing more here can be expected. |
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874 size_t page_size_words = os::vm_page_size() / BytesPerWord; |
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875 size_t aligned_expand_vs_by_words = align_size_up(chunk_word_size, |
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876 page_size_words); |
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877 expand_by(aligned_expand_vs_by_words, false); |
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878 new_chunk = get_chunk_vs(chunk_word_size); |
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879 } |
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880 return new_chunk; |
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881 } |
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882 |
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883 bool VirtualSpaceNode::initialize() { |
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884 |
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885 if (!_rs.is_reserved()) { |
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886 return false; |
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887 } |
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888 |
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889 // Commit only 1 page instead of the whole reserved space _rs.size() |
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890 size_t committed_byte_size = os::vm_page_size(); |
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891 bool result = virtual_space()->initialize(_rs, committed_byte_size); |
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892 if (result) { |
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893 set_top((MetaWord*)virtual_space()->low()); |
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894 set_reserved(MemRegion((HeapWord*)_rs.base(), |
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895 (HeapWord*)(_rs.base() + _rs.size()))); |
6726
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896 |
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897 assert(reserved()->start() == (HeapWord*) _rs.base(), |
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898 err_msg("Reserved start was not set properly " PTR_FORMAT |
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899 " != " PTR_FORMAT, reserved()->start(), _rs.base())); |
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900 assert(reserved()->word_size() == _rs.size() / BytesPerWord, |
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901 err_msg("Reserved size was not set properly " SIZE_FORMAT |
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902 " != " SIZE_FORMAT, reserved()->word_size(), |
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903 _rs.size() / BytesPerWord)); |
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904 } |
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905 |
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906 return result; |
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907 } |
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908 |
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909 void VirtualSpaceNode::print_on(outputStream* st) const { |
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910 size_t used = used_words_in_vs(); |
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911 size_t capacity = capacity_words_in_vs(); |
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912 VirtualSpace* vs = virtual_space(); |
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913 st->print_cr(" space @ " PTR_FORMAT " " SIZE_FORMAT "K, %3d%% used " |
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914 "[" PTR_FORMAT ", " PTR_FORMAT ", " |
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915 PTR_FORMAT ", " PTR_FORMAT ")", |
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916 vs, capacity / K, used * 100 / capacity, |
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917 bottom(), top(), end(), |
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918 vs->high_boundary()); |
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919 } |
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920 |
7185
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921 #ifdef ASSERT |
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922 void VirtualSpaceNode::mangle() { |
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923 size_t word_size = capacity_words_in_vs(); |
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924 Copy::fill_to_words((HeapWord*) low(), word_size, 0xf1f1f1f1); |
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925 } |
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926 #endif // ASSERT |
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927 |
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928 // VirtualSpaceList methods |
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929 // Space allocated from the VirtualSpace |
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930 |
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931 VirtualSpaceList::~VirtualSpaceList() { |
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932 VirtualSpaceListIterator iter(virtual_space_list()); |
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933 while (iter.repeat()) { |
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934 VirtualSpaceNode* vsl = iter.get_next(); |
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935 delete vsl; |
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936 } |
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937 } |
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938 |
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939 size_t VirtualSpaceList::used_words_sum() { |
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940 size_t allocated_by_vs = 0; |
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941 VirtualSpaceListIterator iter(virtual_space_list()); |
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942 while (iter.repeat()) { |
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943 VirtualSpaceNode* vsl = iter.get_next(); |
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944 // Sum used region [bottom, top) in each virtualspace |
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945 allocated_by_vs += vsl->used_words_in_vs(); |
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946 } |
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947 assert(allocated_by_vs >= chunk_manager()->free_chunks_total(), |
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948 err_msg("Total in free chunks " SIZE_FORMAT |
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949 " greater than total from virtual_spaces " SIZE_FORMAT, |
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950 allocated_by_vs, chunk_manager()->free_chunks_total())); |
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951 size_t used = |
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952 allocated_by_vs - chunk_manager()->free_chunks_total(); |
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953 return used; |
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954 } |
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|
955 |
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956 // Space available in all MetadataVirtualspaces allocated |
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957 // for metadata. This is the upper limit on the capacity |
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958 // of chunks allocated out of all the MetadataVirtualspaces. |
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959 size_t VirtualSpaceList::capacity_words_sum() { |
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960 size_t capacity = 0; |
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961 VirtualSpaceListIterator iter(virtual_space_list()); |
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962 while (iter.repeat()) { |
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963 VirtualSpaceNode* vsl = iter.get_next(); |
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964 capacity += vsl->capacity_words_in_vs(); |
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965 } |
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966 return capacity; |
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|
967 } |
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|
968 |
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969 VirtualSpaceList::VirtualSpaceList(size_t word_size ) : |
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970 _is_class(false), |
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971 _virtual_space_list(NULL), |
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972 _current_virtual_space(NULL), |
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973 _virtual_space_total(0), |
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974 _virtual_space_count(0) { |
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975 MutexLockerEx cl(SpaceManager::expand_lock(), |
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976 Mutex::_no_safepoint_check_flag); |
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977 bool initialization_succeeded = grow_vs(word_size); |
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978 |
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979 assert(initialization_succeeded, |
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980 " VirtualSpaceList initialization should not fail"); |
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981 } |
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982 |
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983 VirtualSpaceList::VirtualSpaceList(ReservedSpace rs) : |
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984 _is_class(true), |
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985 _virtual_space_list(NULL), |
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986 _current_virtual_space(NULL), |
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987 _virtual_space_total(0), |
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988 _virtual_space_count(0) { |
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989 MutexLockerEx cl(SpaceManager::expand_lock(), |
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990 Mutex::_no_safepoint_check_flag); |
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991 VirtualSpaceNode* class_entry = new VirtualSpaceNode(rs); |
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992 bool succeeded = class_entry->initialize(); |
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993 assert(succeeded, " VirtualSpaceList initialization should not fail"); |
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994 link_vs(class_entry, rs.size()/BytesPerWord); |
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995 } |
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996 |
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997 // Allocate another meta virtual space and add it to the list. |
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998 bool VirtualSpaceList::grow_vs(size_t vs_word_size) { |
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999 assert_lock_strong(SpaceManager::expand_lock()); |
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1000 if (vs_word_size == 0) { |
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1001 return false; |
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|
1002 } |
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1003 // Reserve the space |
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1004 size_t vs_byte_size = vs_word_size * BytesPerWord; |
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1005 assert(vs_byte_size % os::vm_page_size() == 0, "Not aligned"); |
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1006 |
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1007 // Allocate the meta virtual space and initialize it. |
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1008 VirtualSpaceNode* new_entry = new VirtualSpaceNode(vs_byte_size); |
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1009 if (!new_entry->initialize()) { |
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1010 delete new_entry; |
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1011 return false; |
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1012 } else { |
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1013 link_vs(new_entry, vs_word_size); |
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1014 return true; |
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1015 } |
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1016 } |
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1017 |
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1018 void VirtualSpaceList::link_vs(VirtualSpaceNode* new_entry, size_t vs_word_size) { |
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1019 if (virtual_space_list() == NULL) { |
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1020 set_virtual_space_list(new_entry); |
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1021 } else { |
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1022 current_virtual_space()->set_next(new_entry); |
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1023 } |
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1024 set_current_virtual_space(new_entry); |
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1025 inc_virtual_space_total(vs_word_size); |
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1026 inc_virtual_space_count(); |
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1027 #ifdef ASSERT |
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1028 new_entry->mangle(); |
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1029 #endif |
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1030 if (TraceMetavirtualspaceAllocation && Verbose) { |
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1031 VirtualSpaceNode* vsl = current_virtual_space(); |
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1032 vsl->print_on(tty); |
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1033 } |
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1034 } |
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1035 |
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1036 Metachunk* VirtualSpaceList::get_new_chunk(size_t word_size, |
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1037 size_t grow_chunks_by_words) { |
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1038 |
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1039 // Get a chunk from the chunk freelist |
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1040 Metachunk* next = chunk_manager()->chunk_freelist_allocate(grow_chunks_by_words); |
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1041 |
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1042 // Allocate a chunk out of the current virtual space. |
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1043 if (next == NULL) { |
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1044 next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words); |
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1045 } |
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1046 |
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1047 if (next == NULL) { |
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1048 // Not enough room in current virtual space. Try to commit |
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1049 // more space. |
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1050 size_t expand_vs_by_words = MAX2((size_t)SpaceManager::MediumChunkBunch, |
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1051 grow_chunks_by_words); |
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1052 size_t page_size_words = os::vm_page_size() / BytesPerWord; |
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1053 size_t aligned_expand_vs_by_words = align_size_up(expand_vs_by_words, |
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1054 page_size_words); |
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1055 bool vs_expanded = |
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1056 current_virtual_space()->expand_by(aligned_expand_vs_by_words, false); |
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1057 if (!vs_expanded) { |
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1058 // Should the capacity of the metaspaces be expanded for |
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1059 // this allocation? If it's the virtual space for classes and is |
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1060 // being used for CompressedHeaders, don't allocate a new virtualspace. |
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1061 if (can_grow() && MetaspaceGC::should_expand(this, word_size)) { |
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1062 // Get another virtual space. |
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1063 size_t grow_vs_words = |
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1064 MAX2((size_t)VirtualSpaceSize, aligned_expand_vs_by_words); |
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1065 if (grow_vs(grow_vs_words)) { |
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1066 // Got it. It's on the list now. Get a chunk from it. |
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1067 next = current_virtual_space()->get_chunk_vs_with_expand(grow_chunks_by_words); |
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1068 } |
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1069 if (TraceMetadataHumongousAllocation && SpaceManager::is_humongous(word_size)) { |
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1070 gclog_or_tty->print_cr(" aligned_expand_vs_by_words " PTR_FORMAT, |
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1071 aligned_expand_vs_by_words); |
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1072 gclog_or_tty->print_cr(" grow_vs_words " PTR_FORMAT, |
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1073 grow_vs_words); |
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1074 } |
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1075 } else { |
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1076 // Allocation will fail and induce a GC |
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1077 if (TraceMetadataChunkAllocation && Verbose) { |
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1078 gclog_or_tty->print_cr("VirtualSpaceList::get_new_chunk():" |
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1079 " Fail instead of expand the metaspace"); |
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1080 } |
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1081 } |
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1082 } else { |
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1083 // The virtual space expanded, get a new chunk |
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1084 next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words); |
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1085 assert(next != NULL, "Just expanded, should succeed"); |
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1086 } |
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1087 } |
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1088 |
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1089 return next; |
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1090 } |
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1091 |
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1092 void VirtualSpaceList::print_on(outputStream* st) const { |
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1093 if (TraceMetadataChunkAllocation && Verbose) { |
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1094 VirtualSpaceListIterator iter(virtual_space_list()); |
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1095 while (iter.repeat()) { |
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1096 VirtualSpaceNode* node = iter.get_next(); |
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1097 node->print_on(st); |
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1098 } |
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1099 } |
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1100 } |
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1101 |
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1102 #ifndef PRODUCT |
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1103 bool VirtualSpaceList::contains(const void *ptr) { |
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1104 VirtualSpaceNode* list = virtual_space_list(); |
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1105 VirtualSpaceListIterator iter(list); |
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1106 while (iter.repeat()) { |
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1107 VirtualSpaceNode* node = iter.get_next(); |
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1108 if (node->reserved()->contains(ptr)) { |
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1109 return true; |
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1110 } |
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1111 } |
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1112 return false; |
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1113 } |
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1114 #endif // PRODUCT |
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1115 |
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1116 |
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1117 // MetaspaceGC methods |
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1118 |
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1119 // VM_CollectForMetadataAllocation is the vm operation used to GC. |
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1120 // Within the VM operation after the GC the attempt to allocate the metadata |
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1121 // should succeed. If the GC did not free enough space for the metaspace |
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1122 // allocation, the HWM is increased so that another virtualspace will be |
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1123 // allocated for the metadata. With perm gen the increase in the perm |
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1124 // gen had bounds, MinMetaspaceExpansion and MaxMetaspaceExpansion. The |
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1125 // metaspace policy uses those as the small and large steps for the HWM. |
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1126 // |
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1127 // After the GC the compute_new_size() for MetaspaceGC is called to |
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1128 // resize the capacity of the metaspaces. The current implementation |
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1129 // is based on the flags MinHeapFreeRatio and MaxHeapFreeRatio used |
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1130 // to resize the Java heap by some GC's. New flags can be implemented |
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1131 // if really needed. MinHeapFreeRatio is used to calculate how much |
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1132 // free space is desirable in the metaspace capacity to decide how much |
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1133 // to increase the HWM. MaxHeapFreeRatio is used to decide how much |
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1134 // free space is desirable in the metaspace capacity before decreasing |
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1135 // the HWM. |
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1136 |
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1137 // Calculate the amount to increase the high water mark (HWM). |
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1138 // Increase by a minimum amount (MinMetaspaceExpansion) so that |
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1139 // another expansion is not requested too soon. If that is not |
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1140 // enough to satisfy the allocation (i.e. big enough for a word_size |
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1141 // allocation), increase by MaxMetaspaceExpansion. If that is still |
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1142 // not enough, expand by the size of the allocation (word_size) plus |
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1143 // some. |
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1144 size_t MetaspaceGC::delta_capacity_until_GC(size_t word_size) { |
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1145 size_t before_inc = MetaspaceGC::capacity_until_GC(); |
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1146 size_t min_delta_words = MinMetaspaceExpansion / BytesPerWord; |
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1147 size_t max_delta_words = MaxMetaspaceExpansion / BytesPerWord; |
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1148 size_t page_size_words = os::vm_page_size() / BytesPerWord; |
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1149 size_t size_delta_words = align_size_up(word_size, page_size_words); |
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1150 size_t delta_words = MAX2(size_delta_words, min_delta_words); |
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1151 if (delta_words > min_delta_words) { |
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1152 // Don't want to hit the high water mark on the next |
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1153 // allocation so make the delta greater than just enough |
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1154 // for this allocation. |
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1155 delta_words = MAX2(delta_words, max_delta_words); |
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1156 if (delta_words > max_delta_words) { |
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1157 // This allocation is large but the next ones are probably not |
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1158 // so increase by the minimum. |
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1159 delta_words = delta_words + min_delta_words; |
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1160 } |
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1161 } |
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1162 return delta_words; |
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1163 } |
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1164 |
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1165 bool MetaspaceGC::should_expand(VirtualSpaceList* vsl, size_t word_size) { |
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1166 |
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1167 // Class virtual space should always be expanded. Call GC for the other |
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1168 // metadata virtual space. |
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1169 if (vsl == Metaspace::class_space_list()) return true; |
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1170 |
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1171 // If the user wants a limit, impose one. |
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1172 size_t max_metaspace_size_words = MaxMetaspaceSize / BytesPerWord; |
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1173 size_t metaspace_size_words = MetaspaceSize / BytesPerWord; |
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1174 if (!FLAG_IS_DEFAULT(MaxMetaspaceSize) && |
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1175 vsl->capacity_words_sum() >= max_metaspace_size_words) { |
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1176 return false; |
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1177 } |
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1178 |
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1179 // If this is part of an allocation after a GC, expand |
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1180 // unconditionally. |
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1181 if(MetaspaceGC::expand_after_GC()) { |
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1182 return true; |
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1183 } |
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1184 |
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1185 // If the capacity is below the minimum capacity, allow the |
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1186 // expansion. Also set the high-water-mark (capacity_until_GC) |
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1187 // to that minimum capacity so that a GC will not be induced |
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1188 // until that minimum capacity is exceeded. |
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1189 if (vsl->capacity_words_sum() < metaspace_size_words || |
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1190 capacity_until_GC() == 0) { |
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1191 set_capacity_until_GC(metaspace_size_words); |
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1192 return true; |
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1193 } else { |
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1194 if (vsl->capacity_words_sum() < capacity_until_GC()) { |
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1195 return true; |
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1196 } else { |
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1197 if (TraceMetadataChunkAllocation && Verbose) { |
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1198 gclog_or_tty->print_cr(" allocation request size " SIZE_FORMAT |
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1199 " capacity_until_GC " SIZE_FORMAT |
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1200 " capacity_words_sum " SIZE_FORMAT |
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1201 " used_words_sum " SIZE_FORMAT |
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1202 " free chunks " SIZE_FORMAT |
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1203 " free chunks count %d", |
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1204 word_size, |
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1205 capacity_until_GC(), |
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1206 vsl->capacity_words_sum(), |
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1207 vsl->used_words_sum(), |
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1208 vsl->chunk_manager()->free_chunks_total(), |
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1209 vsl->chunk_manager()->free_chunks_count()); |
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1210 } |
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1211 return false; |
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1212 } |
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1213 } |
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1214 } |
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1215 |
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1216 // Variables are in bytes |
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1217 |
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1218 void MetaspaceGC::compute_new_size() { |
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1219 assert(_shrink_factor <= 100, "invalid shrink factor"); |
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1220 uint current_shrink_factor = _shrink_factor; |
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1221 _shrink_factor = 0; |
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1222 |
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1223 VirtualSpaceList *vsl = Metaspace::space_list(); |
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1224 |
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1225 size_t capacity_after_gc = vsl->capacity_bytes_sum(); |
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1226 // Check to see if these two can be calculated without walking the CLDG |
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1227 size_t used_after_gc = vsl->used_bytes_sum(); |
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1228 size_t capacity_until_GC = vsl->capacity_bytes_sum(); |
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1229 size_t free_after_gc = capacity_until_GC - used_after_gc; |
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1230 |
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1231 const double minimum_free_percentage = MinHeapFreeRatio / 100.0; |
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1232 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
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1233 |
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1234 const double min_tmp = used_after_gc / maximum_used_percentage; |
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1235 size_t minimum_desired_capacity = |
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1236 (size_t)MIN2(min_tmp, double(max_uintx)); |
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1237 // Don't shrink less than the initial generation size |
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1238 minimum_desired_capacity = MAX2(minimum_desired_capacity, |
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1239 MetaspaceSize); |
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1240 |
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1241 if (PrintGCDetails && Verbose) { |
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1242 const double free_percentage = ((double)free_after_gc) / capacity_until_GC; |
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1243 gclog_or_tty->print_cr("\nMetaspaceGC::compute_new_size: "); |
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1244 gclog_or_tty->print_cr(" " |
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1245 " minimum_free_percentage: %6.2f" |
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1246 " maximum_used_percentage: %6.2f", |
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1247 minimum_free_percentage, |
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1248 maximum_used_percentage); |
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1249 double d_free_after_gc = free_after_gc / (double) K; |
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1250 gclog_or_tty->print_cr(" " |
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1251 " free_after_gc : %6.1fK" |
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1252 " used_after_gc : %6.1fK" |
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1253 " capacity_after_gc : %6.1fK" |
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1254 " metaspace HWM : %6.1fK", |
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1255 free_after_gc / (double) K, |
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1256 used_after_gc / (double) K, |
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1257 capacity_after_gc / (double) K, |
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1258 capacity_until_GC / (double) K); |
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1259 gclog_or_tty->print_cr(" " |
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1260 " free_percentage: %6.2f", |
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1261 free_percentage); |
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1262 } |
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1263 |
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1264 |
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1265 if (capacity_until_GC < minimum_desired_capacity) { |
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1266 // If we have less capacity below the metaspace HWM, then |
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1267 // increment the HWM. |
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1268 size_t expand_bytes = minimum_desired_capacity - capacity_until_GC; |
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1269 // Don't expand unless it's significant |
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1270 if (expand_bytes >= MinMetaspaceExpansion) { |
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1271 size_t expand_words = expand_bytes / BytesPerWord; |
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1272 MetaspaceGC::inc_capacity_until_GC(expand_words); |
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1273 } |
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1274 if (PrintGCDetails && Verbose) { |
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1275 size_t new_capacity_until_GC = MetaspaceGC::capacity_until_GC_in_bytes(); |
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1276 gclog_or_tty->print_cr(" expanding:" |
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1277 " minimum_desired_capacity: %6.1fK" |
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1278 " expand_words: %6.1fK" |
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1279 " MinMetaspaceExpansion: %6.1fK" |
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1280 " new metaspace HWM: %6.1fK", |
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1281 minimum_desired_capacity / (double) K, |
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1282 expand_bytes / (double) K, |
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1283 MinMetaspaceExpansion / (double) K, |
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1284 new_capacity_until_GC / (double) K); |
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1285 } |
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1286 return; |
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1287 } |
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1288 |
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1289 // No expansion, now see if we want to shrink |
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1290 size_t shrink_words = 0; |
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1291 // We would never want to shrink more than this |
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1292 size_t max_shrink_words = capacity_until_GC - minimum_desired_capacity; |
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1293 assert(max_shrink_words >= 0, err_msg("max_shrink_words " SIZE_FORMAT, |
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1294 max_shrink_words)); |
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1295 |
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1296 // Should shrinking be considered? |
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1297 if (MaxHeapFreeRatio < 100) { |
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1298 const double maximum_free_percentage = MaxHeapFreeRatio / 100.0; |
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1299 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
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1300 const double max_tmp = used_after_gc / minimum_used_percentage; |
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1301 size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(max_uintx)); |
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1302 maximum_desired_capacity = MAX2(maximum_desired_capacity, |
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1303 MetaspaceSize); |
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1304 if (PrintGC && Verbose) { |
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1305 gclog_or_tty->print_cr(" " |
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1306 " maximum_free_percentage: %6.2f" |
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1307 " minimum_used_percentage: %6.2f", |
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1308 maximum_free_percentage, |
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1309 minimum_used_percentage); |
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1310 gclog_or_tty->print_cr(" " |
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1311 " capacity_until_GC: %6.1fK" |
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1312 " minimum_desired_capacity: %6.1fK" |
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1313 " maximum_desired_capacity: %6.1fK", |
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1314 capacity_until_GC / (double) K, |
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1315 minimum_desired_capacity / (double) K, |
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1316 maximum_desired_capacity / (double) K); |
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1317 } |
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1318 |
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1319 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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1320 "sanity check"); |
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1321 |
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1322 if (capacity_until_GC > maximum_desired_capacity) { |
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1323 // Capacity too large, compute shrinking size |
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1324 shrink_words = capacity_until_GC - maximum_desired_capacity; |
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1325 // We don't want shrink all the way back to initSize if people call |
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1326 // System.gc(), because some programs do that between "phases" and then |
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1327 // we'd just have to grow the heap up again for the next phase. So we |
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1328 // damp the shrinking: 0% on the first call, 10% on the second call, 40% |
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1329 // on the third call, and 100% by the fourth call. But if we recompute |
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1330 // size without shrinking, it goes back to 0%. |
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1331 shrink_words = shrink_words / 100 * current_shrink_factor; |
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1332 assert(shrink_words <= max_shrink_words, |
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1333 err_msg("invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT, |
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1334 shrink_words, max_shrink_words)); |
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1335 if (current_shrink_factor == 0) { |
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1336 _shrink_factor = 10; |
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1337 } else { |
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1338 _shrink_factor = MIN2(current_shrink_factor * 4, (uint) 100); |
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1339 } |
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1340 if (PrintGCDetails && Verbose) { |
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1341 gclog_or_tty->print_cr(" " |
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1342 " shrinking:" |
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1343 " initSize: %.1fK" |
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1344 " maximum_desired_capacity: %.1fK", |
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1345 MetaspaceSize / (double) K, |
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1346 maximum_desired_capacity / (double) K); |
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1347 gclog_or_tty->print_cr(" " |
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1348 " shrink_words: %.1fK" |
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1349 " current_shrink_factor: %d" |
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1350 " new shrink factor: %d" |
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1351 " MinMetaspaceExpansion: %.1fK", |
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1352 shrink_words / (double) K, |
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1353 current_shrink_factor, |
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1354 _shrink_factor, |
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1355 MinMetaspaceExpansion / (double) K); |
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1356 } |
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1357 } |
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1358 } |
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1359 |
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1360 |
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1361 // Don't shrink unless it's significant |
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1362 if (shrink_words >= MinMetaspaceExpansion) { |
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1363 VirtualSpaceNode* csp = vsl->current_virtual_space(); |
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1364 size_t available_to_shrink = csp->capacity_words_in_vs() - |
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1365 csp->used_words_in_vs(); |
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1366 shrink_words = MIN2(shrink_words, available_to_shrink); |
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1367 csp->shrink_by(shrink_words); |
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1368 MetaspaceGC::dec_capacity_until_GC(shrink_words); |
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1369 if (PrintGCDetails && Verbose) { |
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1370 size_t new_capacity_until_GC = MetaspaceGC::capacity_until_GC_in_bytes(); |
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1371 gclog_or_tty->print_cr(" metaspace HWM: %.1fK", new_capacity_until_GC / (double) K); |
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1372 } |
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1373 } |
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1374 assert(vsl->used_bytes_sum() == used_after_gc && |
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1375 used_after_gc <= vsl->capacity_bytes_sum(), |
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1376 "sanity check"); |
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1377 |
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1378 } |
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1379 |
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1380 // Metadebug methods |
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1381 |
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1382 void Metadebug::deallocate_chunk_a_lot(SpaceManager* sm, |
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1383 size_t chunk_word_size){ |
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1384 #ifdef ASSERT |
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1385 VirtualSpaceList* vsl = sm->vs_list(); |
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1386 if (MetaDataDeallocateALot && |
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1387 Metadebug::deallocate_chunk_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) { |
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1388 Metadebug::reset_deallocate_chunk_a_lot_count(); |
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1389 for (uint i = 0; i < metadata_deallocate_a_lock_chunk; i++) { |
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1390 Metachunk* dummy_chunk = vsl->current_virtual_space()->take_from_committed(chunk_word_size); |
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1391 if (dummy_chunk == NULL) { |
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1392 break; |
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1393 } |
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1394 vsl->chunk_manager()->chunk_freelist_deallocate(dummy_chunk); |
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1395 |
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1396 if (TraceMetadataChunkAllocation && Verbose) { |
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1397 gclog_or_tty->print("Metadebug::deallocate_chunk_a_lot: %d) ", |
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1398 sm->sum_count_in_chunks_in_use()); |
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1399 dummy_chunk->print_on(gclog_or_tty); |
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1400 gclog_or_tty->print_cr(" Free chunks total %d count %d", |
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1401 vsl->chunk_manager()->free_chunks_total(), |
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1402 vsl->chunk_manager()->free_chunks_count()); |
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1403 } |
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|
1404 } |
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|
1405 } else { |
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1406 Metadebug::inc_deallocate_chunk_a_lot_count(); |
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|
1407 } |
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|
1408 #endif |
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|
1409 } |
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|
1410 |
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1411 void Metadebug::deallocate_block_a_lot(SpaceManager* sm, |
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1412 size_t raw_word_size){ |
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|
1413 #ifdef ASSERT |
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1414 if (MetaDataDeallocateALot && |
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1415 Metadebug::deallocate_block_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) { |
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1416 Metadebug::set_deallocate_block_a_lot_count(0); |
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1417 for (uint i = 0; i < metadata_deallocate_a_lot_block; i++) { |
6885 | 1418 MetaWord* dummy_block = sm->allocate_work(raw_word_size); |
6725
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1419 if (dummy_block == 0) { |
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1420 break; |
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|
1421 } |
6885 | 1422 sm->deallocate(dummy_block, raw_word_size); |
6725
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1423 } |
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1424 } else { |
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1425 Metadebug::inc_deallocate_block_a_lot_count(); |
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1426 } |
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1427 #endif |
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|
1428 } |
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|
1429 |
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1430 void Metadebug::init_allocation_fail_alot_count() { |
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1431 if (MetadataAllocationFailALot) { |
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1432 _allocation_fail_alot_count = |
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1433 1+(long)((double)MetadataAllocationFailALotInterval*os::random()/(max_jint+1.0)); |
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1434 } |
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|
1435 } |
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|
1436 |
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|
1437 #ifdef ASSERT |
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|
1438 bool Metadebug::test_metadata_failure() { |
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|
1439 if (MetadataAllocationFailALot && |
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1440 Threads::is_vm_complete()) { |
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1441 if (_allocation_fail_alot_count > 0) { |
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|
1442 _allocation_fail_alot_count--; |
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|
1443 } else { |
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1444 if (TraceMetadataChunkAllocation && Verbose) { |
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1445 gclog_or_tty->print_cr("Metadata allocation failing for " |
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|
1446 "MetadataAllocationFailALot"); |
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|
1447 } |
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|
1448 init_allocation_fail_alot_count(); |
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|
1449 return true; |
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|
1450 } |
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|
1451 } |
da91efe96a93
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|
1452 return false; |
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|
1453 } |
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|
1454 #endif |
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|
1455 |
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|
1456 // ChunkList methods |
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|
1457 |
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|
1458 size_t ChunkList::sum_list_size() { |
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|
1459 size_t result = 0; |
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|
1460 Metachunk* cur = head(); |
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|
1461 while (cur != NULL) { |
da91efe96a93
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|
1462 result += cur->word_size(); |
da91efe96a93
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|
1463 cur = cur->next(); |
da91efe96a93
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diff
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|
1464 } |
da91efe96a93
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|
1465 return result; |
da91efe96a93
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|
1466 } |
da91efe96a93
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|
1467 |
da91efe96a93
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|
1468 size_t ChunkList::sum_list_count() { |
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|
1469 size_t result = 0; |
da91efe96a93
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1470 Metachunk* cur = head(); |
da91efe96a93
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|
1471 while (cur != NULL) { |
da91efe96a93
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coleenp
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|
1472 result++; |
da91efe96a93
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coleenp
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|
1473 cur = cur->next(); |
da91efe96a93
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|
1474 } |
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|
1475 return result; |
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coleenp
parents:
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|
1476 } |
da91efe96a93
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|
1477 |
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|
1478 size_t ChunkList::sum_list_capacity() { |
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|
1479 size_t result = 0; |
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|
1480 Metachunk* cur = head(); |
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|
1481 while (cur != NULL) { |
da91efe96a93
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coleenp
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|
1482 result += cur->capacity_word_size(); |
da91efe96a93
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|
1483 cur = cur->next(); |
da91efe96a93
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|
1484 } |
da91efe96a93
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|
1485 return result; |
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|
1486 } |
da91efe96a93
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|
1487 |
da91efe96a93
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|
1488 void ChunkList::add_at_head(Metachunk* head, Metachunk* tail) { |
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1489 assert_lock_strong(SpaceManager::expand_lock()); |
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|
1490 assert(tail->next() == NULL, "Not the tail"); |
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|
1491 |
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|
1492 if (TraceMetadataChunkAllocation && Verbose) { |
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|
1493 tty->print("ChunkList::add_at_head: "); |
da91efe96a93
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|
1494 Metachunk* cur = head; |
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|
1495 while (cur != NULL) { |
da91efe96a93
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|
1496 tty->print(PTR_FORMAT " (" SIZE_FORMAT ") ", cur, cur->word_size()); |
da91efe96a93
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|
1497 cur = cur->next(); |
da91efe96a93
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|
1498 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
1499 tty->print_cr(""); |
da91efe96a93
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|
1500 } |
da91efe96a93
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|
1501 |
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6964458: Reimplement class meta-data storage to use native memory
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|
1502 if (tail != NULL) { |
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coleenp
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|
1503 tail->set_next(_head); |
da91efe96a93
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diff
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|
1504 } |
da91efe96a93
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coleenp
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|
1505 set_head(head); |
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coleenp
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diff
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|
1506 } |
da91efe96a93
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|
1507 |
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|
1508 void ChunkList::add_at_head(Metachunk* list) { |
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|
1509 if (list == NULL) { |
da91efe96a93
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coleenp
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diff
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|
1510 // Nothing to add |
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|
1511 return; |
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diff
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|
1512 } |
da91efe96a93
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|
1513 assert_lock_strong(SpaceManager::expand_lock()); |
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|
1514 Metachunk* head = list; |
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|
1515 Metachunk* tail = list; |
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|
1516 Metachunk* cur = head->next(); |
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|
1517 // Search for the tail since it is not passed. |
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|
1518 while (cur != NULL) { |
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coleenp
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|
1519 tail = cur; |
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|
1520 cur = cur->next(); |
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|
1521 } |
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|
1522 add_at_head(head, tail); |
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|
1523 } |
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|
1524 |
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|
1525 // ChunkManager methods |
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|
1526 |
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1527 // Verification of _free_chunks_total and _free_chunks_count does not |
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|
1528 // work with the CMS collector because its use of additional locks |
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|
1529 // complicate the mutex deadlock detection but it can still be useful |
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|
1530 // for detecting errors in the chunk accounting with other collectors. |
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|
1531 |
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|
1532 size_t ChunkManager::free_chunks_total() { |
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|
1533 #ifdef ASSERT |
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|
1534 if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) { |
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1535 MutexLockerEx cl(SpaceManager::expand_lock(), |
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1536 Mutex::_no_safepoint_check_flag); |
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1537 slow_locked_verify_free_chunks_total(); |
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1538 } |
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1539 #endif |
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|
1540 return _free_chunks_total; |
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|
1541 } |
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1542 |
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1543 size_t ChunkManager::free_chunks_total_in_bytes() { |
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1544 return free_chunks_total() * BytesPerWord; |
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1545 } |
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|
1546 |
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1547 size_t ChunkManager::free_chunks_count() { |
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1548 #ifdef ASSERT |
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1549 if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) { |
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1550 MutexLockerEx cl(SpaceManager::expand_lock(), |
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1551 Mutex::_no_safepoint_check_flag); |
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1552 // This lock is only needed in debug because the verification |
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1553 // of the _free_chunks_totals walks the list of free chunks |
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1554 slow_locked_verify_free_chunks_count(); |
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1555 } |
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1556 #endif |
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1557 return _free_chunks_count; |
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1558 } |
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1559 |
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1560 void ChunkManager::locked_verify_free_chunks_total() { |
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1561 assert_lock_strong(SpaceManager::expand_lock()); |
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1562 assert(sum_free_chunks() == _free_chunks_total, |
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1563 err_msg("_free_chunks_total " SIZE_FORMAT " is not the" |
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1564 " same as sum " SIZE_FORMAT, _free_chunks_total, |
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1565 sum_free_chunks())); |
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1566 } |
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1567 |
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1568 void ChunkManager::verify_free_chunks_total() { |
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1569 MutexLockerEx cl(SpaceManager::expand_lock(), |
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1570 Mutex::_no_safepoint_check_flag); |
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1571 locked_verify_free_chunks_total(); |
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1572 } |
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1573 |
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1574 void ChunkManager::locked_verify_free_chunks_count() { |
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1575 assert_lock_strong(SpaceManager::expand_lock()); |
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1576 assert(sum_free_chunks_count() == _free_chunks_count, |
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1577 err_msg("_free_chunks_count " SIZE_FORMAT " is not the" |
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1578 " same as sum " SIZE_FORMAT, _free_chunks_count, |
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1579 sum_free_chunks_count())); |
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1580 } |
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1581 |
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1582 void ChunkManager::verify_free_chunks_count() { |
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1583 #ifdef ASSERT |
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1584 MutexLockerEx cl(SpaceManager::expand_lock(), |
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1585 Mutex::_no_safepoint_check_flag); |
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1586 locked_verify_free_chunks_count(); |
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1587 #endif |
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1588 } |
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1589 |
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1590 void ChunkManager::verify() { |
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1591 MutexLockerEx cl(SpaceManager::expand_lock(), |
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1592 Mutex::_no_safepoint_check_flag); |
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1593 locked_verify(); |
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1594 } |
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1595 |
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1596 void ChunkManager::locked_verify() { |
6885 | 1597 locked_verify_free_chunks_count(); |
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1598 locked_verify_free_chunks_total(); |
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1599 } |
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1600 |
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1601 void ChunkManager::locked_print_free_chunks(outputStream* st) { |
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1602 assert_lock_strong(SpaceManager::expand_lock()); |
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1603 st->print_cr("Free chunk total 0x%x count 0x%x", |
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1604 _free_chunks_total, _free_chunks_count); |
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1605 } |
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1606 |
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1607 void ChunkManager::locked_print_sum_free_chunks(outputStream* st) { |
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1608 assert_lock_strong(SpaceManager::expand_lock()); |
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1609 st->print_cr("Sum free chunk total 0x%x count 0x%x", |
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1610 sum_free_chunks(), sum_free_chunks_count()); |
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1611 } |
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1612 ChunkList* ChunkManager::free_chunks(ChunkIndex index) { |
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1613 return &_free_chunks[index]; |
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1614 } |
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1615 |
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1616 // These methods that sum the free chunk lists are used in printing |
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1617 // methods that are used in product builds. |
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1618 size_t ChunkManager::sum_free_chunks() { |
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1619 assert_lock_strong(SpaceManager::expand_lock()); |
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1620 size_t result = 0; |
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1621 for (ChunkIndex i = SmallIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) { |
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1622 ChunkList* list = free_chunks(i); |
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1623 |
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1624 if (list == NULL) { |
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1625 continue; |
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1626 } |
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1627 |
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1628 result = result + list->sum_list_capacity(); |
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1629 } |
6885 | 1630 result = result + humongous_dictionary()->total_size(); |
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1631 return result; |
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|
1632 } |
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|
1633 |
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1634 size_t ChunkManager::sum_free_chunks_count() { |
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1635 assert_lock_strong(SpaceManager::expand_lock()); |
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1636 size_t count = 0; |
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1637 for (ChunkIndex i = SmallIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) { |
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1638 ChunkList* list = free_chunks(i); |
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1639 if (list == NULL) { |
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1640 continue; |
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|
1641 } |
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1642 count = count + list->sum_list_count(); |
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1643 } |
6885 | 1644 count = count + humongous_dictionary()->total_free_blocks(); |
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1645 return count; |
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|
1646 } |
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1647 |
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1648 ChunkList* ChunkManager::find_free_chunks_list(size_t word_size) { |
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1649 switch (word_size) { |
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|
1650 case SpaceManager::SmallChunk : |
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1651 return &_free_chunks[0]; |
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|
1652 case SpaceManager::MediumChunk : |
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1653 return &_free_chunks[1]; |
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|
1654 default: |
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1655 assert(word_size > SpaceManager::MediumChunk, "List inconsistency"); |
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|
1656 return &_free_chunks[2]; |
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|
1657 } |
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1658 } |
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1659 |
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1660 void ChunkManager::free_chunks_put(Metachunk* chunk) { |
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1661 assert_lock_strong(SpaceManager::expand_lock()); |
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1662 ChunkList* free_list = find_free_chunks_list(chunk->word_size()); |
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1663 chunk->set_next(free_list->head()); |
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1664 free_list->set_head(chunk); |
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1665 // chunk is being returned to the chunk free list |
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1666 inc_free_chunks_total(chunk->capacity_word_size()); |
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1667 slow_locked_verify(); |
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1668 } |
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1669 |
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1670 void ChunkManager::chunk_freelist_deallocate(Metachunk* chunk) { |
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1671 // The deallocation of a chunk originates in the freelist |
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1672 // manangement code for a Metaspace and does not hold the |
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1673 // lock. |
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1674 assert(chunk != NULL, "Deallocating NULL"); |
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1675 assert_lock_strong(SpaceManager::expand_lock()); |
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1676 slow_locked_verify(); |
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1677 if (TraceMetadataChunkAllocation) { |
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1678 tty->print_cr("ChunkManager::chunk_freelist_deallocate: chunk " |
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1679 PTR_FORMAT " size " SIZE_FORMAT, |
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1680 chunk, chunk->word_size()); |
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1681 } |
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1682 free_chunks_put(chunk); |
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1683 } |
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1684 |
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1685 Metachunk* ChunkManager::free_chunks_get(size_t word_size) { |
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1686 assert_lock_strong(SpaceManager::expand_lock()); |
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1687 |
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1688 slow_locked_verify(); |
6885 | 1689 |
1690 Metachunk* chunk = NULL; | |
1691 if (!SpaceManager::is_humongous(word_size)) { | |
1692 ChunkList* free_list = find_free_chunks_list(word_size); | |
1693 assert(free_list != NULL, "Sanity check"); | |
1694 | |
1695 chunk = free_list->head(); | |
1696 debug_only(Metachunk* debug_head = chunk;) | |
1697 | |
1698 if (chunk == NULL) { | |
1699 return NULL; | |
1700 } | |
1701 | |
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1702 // Remove the chunk as the head of the list. |
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1703 free_list->set_head(chunk->next()); |
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1704 chunk->set_next(NULL); |
6885 | 1705 // Chunk has been removed from the chunks free list. |
1706 dec_free_chunks_total(chunk->capacity_word_size()); | |
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1707 |
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1708 if (TraceMetadataChunkAllocation && Verbose) { |
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1709 tty->print_cr("ChunkManager::free_chunks_get: free_list " |
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1710 PTR_FORMAT " head " PTR_FORMAT " size " SIZE_FORMAT, |
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1711 free_list, chunk, chunk->word_size()); |
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1712 } |
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1713 } else { |
6885 | 1714 chunk = humongous_dictionary()->get_chunk( |
1715 word_size, | |
1716 FreeBlockDictionary<Metachunk>::atLeast); | |
1717 | |
1718 if (chunk != NULL) { | |
1719 if (TraceMetadataHumongousAllocation) { | |
1720 size_t waste = chunk->word_size() - word_size; | |
1721 tty->print_cr("Free list allocate humongous chunk size " SIZE_FORMAT | |
1722 " for requested size " SIZE_FORMAT | |
1723 " waste " SIZE_FORMAT, | |
1724 chunk->word_size(), word_size, waste); | |
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1725 } |
6885 | 1726 // Chunk is being removed from the chunks free list. |
1727 dec_free_chunks_total(chunk->capacity_word_size()); | |
1728 #ifdef ASSERT | |
1729 chunk->set_is_free(false); | |
1730 #endif | |
1731 } | |
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1732 } |
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1733 slow_locked_verify(); |
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1734 return chunk; |
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1735 } |
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1736 |
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1737 Metachunk* ChunkManager::chunk_freelist_allocate(size_t word_size) { |
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1738 assert_lock_strong(SpaceManager::expand_lock()); |
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1739 slow_locked_verify(); |
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1740 |
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1741 // Take from the beginning of the list |
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1742 Metachunk* chunk = free_chunks_get(word_size); |
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1743 if (chunk == NULL) { |
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1744 return NULL; |
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1745 } |
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1746 |
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1747 assert(word_size <= chunk->word_size() || |
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1748 SpaceManager::is_humongous(chunk->word_size()), |
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1749 "Non-humongous variable sized chunk"); |
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1750 if (TraceMetadataChunkAllocation) { |
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1751 tty->print("ChunkManager::chunk_freelist_allocate: chunk " |
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1752 PTR_FORMAT " size " SIZE_FORMAT " ", |
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1753 chunk, chunk->word_size()); |
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1754 locked_print_free_chunks(tty); |
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1755 } |
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1756 |
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1757 return chunk; |
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1758 } |
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1759 |
6885 | 1760 void ChunkManager::print_on(outputStream* out) { |
1761 if (PrintFLSStatistics != 0) { | |
1762 humongous_dictionary()->report_statistics(); | |
1763 } | |
1764 } | |
1765 | |
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1766 // SpaceManager methods |
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1767 |
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1768 size_t SpaceManager::sum_free_in_chunks_in_use() const { |
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1769 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
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1770 size_t free = 0; |
6885 | 1771 for (ChunkIndex i = SmallIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
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1772 Metachunk* chunk = chunks_in_use(i); |
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1773 while (chunk != NULL) { |
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1774 free += chunk->free_word_size(); |
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1775 chunk = chunk->next(); |
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1776 } |
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1777 } |
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1778 return free; |
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1779 } |
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1780 |
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1781 size_t SpaceManager::sum_waste_in_chunks_in_use() const { |
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1782 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
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1783 size_t result = 0; |
6885 | 1784 for (ChunkIndex i = SmallIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
1785 | |
1786 | |
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1787 result += sum_waste_in_chunks_in_use(i); |
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1788 } |
6885 | 1789 |
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1790 return result; |
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1791 } |
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1792 |
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1793 size_t SpaceManager::sum_waste_in_chunks_in_use(ChunkIndex index) const { |
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1794 size_t result = 0; |
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1795 size_t count = 0; |
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1796 Metachunk* chunk = chunks_in_use(index); |
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1797 // Count the free space in all the chunk but not the |
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1798 // current chunk from which allocations are still being done. |
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1799 if (chunk != NULL) { |
6885 | 1800 Metachunk* prev = chunk; |
1801 while (chunk != NULL && chunk != current_chunk()) { | |
1802 result += chunk->free_word_size(); | |
1803 prev = chunk; | |
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1804 chunk = chunk->next(); |
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1805 count++; |
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1806 } |
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1807 } |
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1808 return result; |
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1809 } |
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1810 |
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1811 size_t SpaceManager::sum_capacity_in_chunks_in_use() const { |
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1812 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
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1813 size_t sum = 0; |
6885 | 1814 for (ChunkIndex i = SmallIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
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1815 Metachunk* chunk = chunks_in_use(i); |
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1816 while (chunk != NULL) { |
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1817 // Just changed this sum += chunk->capacity_word_size(); |
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1818 // sum += chunk->word_size() - Metachunk::overhead(); |
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1819 sum += chunk->capacity_word_size(); |
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1820 chunk = chunk->next(); |
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1821 } |
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1822 } |
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1823 return sum; |
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1824 } |
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1825 |
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1826 size_t SpaceManager::sum_count_in_chunks_in_use() { |
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1827 size_t count = 0; |
6885 | 1828 for (ChunkIndex i = SmallIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
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1829 count = count + sum_count_in_chunks_in_use(i); |
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1830 } |
6885 | 1831 |
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1832 return count; |
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1833 } |
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1834 |
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1835 size_t SpaceManager::sum_count_in_chunks_in_use(ChunkIndex i) { |
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1836 size_t count = 0; |
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1837 Metachunk* chunk = chunks_in_use(i); |
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1838 while (chunk != NULL) { |
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1839 count++; |
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1840 chunk = chunk->next(); |
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1841 } |
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1842 return count; |
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1843 } |
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1844 |
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1845 |
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1846 size_t SpaceManager::sum_used_in_chunks_in_use() const { |
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1847 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
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1848 size_t used = 0; |
6885 | 1849 for (ChunkIndex i = SmallIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
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1850 Metachunk* chunk = chunks_in_use(i); |
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1851 while (chunk != NULL) { |
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1852 used += chunk->used_word_size(); |
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1853 chunk = chunk->next(); |
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1854 } |
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1855 } |
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1856 return used; |
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1857 } |
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1858 |
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1859 void SpaceManager::locked_print_chunks_in_use_on(outputStream* st) const { |
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1860 |
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1861 Metachunk* small_chunk = chunks_in_use(SmallIndex); |
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1862 st->print_cr("SpaceManager: small chunk " PTR_FORMAT |
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1863 " free " SIZE_FORMAT, |
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1864 small_chunk, |
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1865 small_chunk->free_word_size()); |
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1866 |
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1867 Metachunk* medium_chunk = chunks_in_use(MediumIndex); |
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1868 st->print("medium chunk " PTR_FORMAT, medium_chunk); |
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1869 Metachunk* tail = current_chunk(); |
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1870 st->print_cr(" current chunk " PTR_FORMAT, tail); |
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1871 |
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1872 Metachunk* head = chunks_in_use(HumongousIndex); |
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1873 st->print_cr("humongous chunk " PTR_FORMAT, head); |
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1874 |
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1875 vs_list()->chunk_manager()->locked_print_free_chunks(st); |
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1876 vs_list()->chunk_manager()->locked_print_sum_free_chunks(st); |
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1877 } |
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1878 |
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1879 size_t SpaceManager::calc_chunk_size(size_t word_size) { |
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1880 |
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1881 // Decide between a small chunk and a medium chunk. Up to |
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1882 // _small_chunk_limit small chunks can be allocated but |
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1883 // once a medium chunk has been allocated, no more small |
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1884 // chunks will be allocated. |
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1885 size_t chunk_word_size; |
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1886 if (chunks_in_use(MediumIndex) == NULL && |
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1887 (!has_small_chunk_limit() || |
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1888 sum_count_in_chunks_in_use(SmallIndex) < _small_chunk_limit)) { |
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1889 chunk_word_size = (size_t) SpaceManager::SmallChunk; |
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1890 if (word_size + Metachunk::overhead() > SpaceManager::SmallChunk) { |
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1891 chunk_word_size = MediumChunk; |
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1892 } |
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1893 } else { |
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1894 chunk_word_size = MediumChunk; |
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1895 } |
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1896 |
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1897 // Might still need a humongous chunk |
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1898 chunk_word_size = |
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1899 MAX2((size_t) chunk_word_size, word_size + Metachunk::overhead()); |
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1900 |
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1901 if (TraceMetadataHumongousAllocation && |
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1902 SpaceManager::is_humongous(word_size)) { |
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1903 gclog_or_tty->print_cr("Metadata humongous allocation:"); |
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1904 gclog_or_tty->print_cr(" word_size " PTR_FORMAT, word_size); |
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1905 gclog_or_tty->print_cr(" chunk_word_size " PTR_FORMAT, |
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1906 chunk_word_size); |
6885 | 1907 gclog_or_tty->print_cr(" chunk overhead " PTR_FORMAT, |
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1908 Metachunk::overhead()); |
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1909 } |
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1910 return chunk_word_size; |
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1911 } |
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1912 |
6885 | 1913 MetaWord* SpaceManager::grow_and_allocate(size_t word_size) { |
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1914 assert(vs_list()->current_virtual_space() != NULL, |
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1915 "Should have been set"); |
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1916 assert(current_chunk() == NULL || |
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1917 current_chunk()->allocate(word_size) == NULL, |
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1918 "Don't need to expand"); |
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1919 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag); |
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1920 |
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1921 if (TraceMetadataChunkAllocation && Verbose) { |
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1922 gclog_or_tty->print_cr("SpaceManager::grow_and_allocate for " SIZE_FORMAT |
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1923 " words " SIZE_FORMAT " space left", |
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1924 word_size, current_chunk() != NULL ? |
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1925 current_chunk()->free_word_size() : 0); |
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1926 } |
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1927 |
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1928 // Get another chunk out of the virtual space |
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1929 size_t grow_chunks_by_words = calc_chunk_size(word_size); |
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1930 Metachunk* next = vs_list()->get_new_chunk(word_size, grow_chunks_by_words); |
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1931 |
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1932 // If a chunk was available, add it to the in-use chunk list |
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1933 // and do an allocation from it. |
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1934 if (next != NULL) { |
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1935 Metadebug::deallocate_chunk_a_lot(this, grow_chunks_by_words); |
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1936 // Add to this manager's list of chunks in use. |
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1937 add_chunk(next, false); |
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1938 return next->allocate(word_size); |
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1939 } |
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1940 return NULL; |
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1941 } |
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1942 |
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1943 void SpaceManager::print_on(outputStream* st) const { |
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1944 |
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1945 for (ChunkIndex i = SmallIndex; |
6885 | 1946 i < NumberOfInUseLists ; |
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1947 i = next_chunk_index(i) ) { |
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1948 st->print_cr(" chunks_in_use " PTR_FORMAT " chunk size " PTR_FORMAT, |
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1949 chunks_in_use(i), |
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1950 chunks_in_use(i) == NULL ? 0 : chunks_in_use(i)->word_size()); |
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1951 } |
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1952 st->print_cr(" waste: Small " SIZE_FORMAT " Medium " SIZE_FORMAT |
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1953 " Humongous " SIZE_FORMAT, |
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1954 sum_waste_in_chunks_in_use(SmallIndex), |
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1955 sum_waste_in_chunks_in_use(MediumIndex), |
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1956 sum_waste_in_chunks_in_use(HumongousIndex)); |
6885 | 1957 // block free lists |
1958 if (block_freelists() != NULL) { | |
1959 st->print_cr("total in block free lists " SIZE_FORMAT, | |
1960 block_freelists()->total_size()); | |
1961 } | |
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1962 } |
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1963 |
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1964 SpaceManager::SpaceManager(Mutex* lock, VirtualSpaceList* vs_list) : |
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1965 _vs_list(vs_list), |
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1966 _allocation_total(0), |
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1967 _lock(lock) { |
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1968 Metadebug::init_allocation_fail_alot_count(); |
6885 | 1969 for (ChunkIndex i = SmallIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
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1970 _chunks_in_use[i] = NULL; |
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1971 } |
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1972 _current_chunk = NULL; |
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1973 if (TraceMetadataChunkAllocation && Verbose) { |
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1974 gclog_or_tty->print_cr("SpaceManager(): " PTR_FORMAT, this); |
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1975 } |
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1976 } |
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1977 |
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1978 SpaceManager::~SpaceManager() { |
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1979 MutexLockerEx fcl(SpaceManager::expand_lock(), |
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1980 Mutex::_no_safepoint_check_flag); |
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1981 |
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1982 ChunkManager* chunk_manager = vs_list()->chunk_manager(); |
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1983 |
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1984 chunk_manager->slow_locked_verify(); |
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1985 |
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1986 if (TraceMetadataChunkAllocation && Verbose) { |
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1987 gclog_or_tty->print_cr("~SpaceManager(): " PTR_FORMAT, this); |
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1988 locked_print_chunks_in_use_on(gclog_or_tty); |
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1989 } |
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1990 |
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1991 // Mangle freed memory. |
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1992 NOT_PRODUCT(mangle_freed_chunks();) |
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1993 |
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1994 // Have to update before the chunks_in_use lists are emptied |
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1995 // below. |
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1996 chunk_manager->inc_free_chunks_total(sum_capacity_in_chunks_in_use(), |
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1997 sum_count_in_chunks_in_use()); |
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1998 |
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1999 // Add all the chunks in use by this space manager |
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2000 // to the global list of free chunks. |
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2001 |
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2002 // Small chunks. There is one _current_chunk for each |
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2003 // Metaspace. It could point to a small or medium chunk. |
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2004 // Rather than determine which it is, follow the list of |
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2005 // small chunks to add them to the free list |
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2006 Metachunk* small_chunk = chunks_in_use(SmallIndex); |
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2007 chunk_manager->free_small_chunks()->add_at_head(small_chunk); |
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2008 set_chunks_in_use(SmallIndex, NULL); |
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2009 |
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2010 // After the small chunk are the medium chunks |
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2011 Metachunk* medium_chunk = chunks_in_use(MediumIndex); |
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2012 assert(medium_chunk == NULL || |
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2013 medium_chunk->word_size() == MediumChunk, |
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2014 "Chunk is on the wrong list"); |
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2015 |
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2016 if (medium_chunk != NULL) { |
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2017 Metachunk* head = medium_chunk; |
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2018 // If there is a medium chunk then the _current_chunk can only |
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2019 // point to the last medium chunk. |
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2020 Metachunk* tail = current_chunk(); |
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2021 chunk_manager->free_medium_chunks()->add_at_head(head, tail); |
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2022 set_chunks_in_use(MediumIndex, NULL); |
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2023 } |
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2024 |
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2025 // Humongous chunks |
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2026 // Humongous chunks are never the current chunk. |
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2027 Metachunk* humongous_chunks = chunks_in_use(HumongousIndex); |
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2028 |
6885 | 2029 while (humongous_chunks != NULL) { |
2030 #ifdef ASSERT | |
2031 humongous_chunks->set_is_free(true); | |
2032 #endif | |
2033 Metachunk* next_humongous_chunks = humongous_chunks->next(); | |
2034 chunk_manager->humongous_dictionary()->return_chunk(humongous_chunks); | |
2035 humongous_chunks = next_humongous_chunks; | |
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2036 } |
6885 | 2037 set_chunks_in_use(HumongousIndex, NULL); |
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2038 chunk_manager->slow_locked_verify(); |
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2039 } |
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|
2040 |
6885 | 2041 void SpaceManager::deallocate(MetaWord* p, size_t word_size) { |
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2042 assert_lock_strong(_lock); |
6885 | 2043 size_t min_size = TreeChunk<Metablock, FreeList>::min_size(); |
2044 assert(word_size >= min_size, | |
2045 err_msg("Should not deallocate dark matter " SIZE_FORMAT, word_size)); | |
2046 block_freelists()->return_block(p, word_size); | |
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|
2047 } |
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|
2048 |
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2049 // Adds a chunk to the list of chunks in use. |
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2050 void SpaceManager::add_chunk(Metachunk* new_chunk, bool make_current) { |
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2051 |
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2052 assert(new_chunk != NULL, "Should not be NULL"); |
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2053 assert(new_chunk->next() == NULL, "Should not be on a list"); |
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2054 |
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2055 new_chunk->reset_empty(); |
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|
2056 |
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2057 // Find the correct list and and set the current |
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2058 // chunk for that list. |
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2059 switch (new_chunk->word_size()) { |
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|
2060 case SpaceManager::SmallChunk : |
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2061 if (chunks_in_use(SmallIndex) == NULL) { |
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2062 // First chunk to add to the list |
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2063 set_chunks_in_use(SmallIndex, new_chunk); |
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|
2064 } else { |
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2065 assert(current_chunk()->word_size() == SpaceManager::SmallChunk, |
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2066 err_msg( "Incorrect mix of sizes in chunk list " |
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|
2067 SIZE_FORMAT " new chunk " SIZE_FORMAT, |
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|
2068 current_chunk()->word_size(), new_chunk->word_size())); |
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|
2069 current_chunk()->set_next(new_chunk); |
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|
2070 } |
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|
2071 // Make current chunk |
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|
2072 set_current_chunk(new_chunk); |
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|
2073 break; |
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|
2074 case SpaceManager::MediumChunk : |
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|
2075 if (chunks_in_use(MediumIndex) == NULL) { |
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|
2076 // About to add the first medium chunk so teminate the |
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|
2077 // small chunk list. In general once medium chunks are |
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2078 // being added, we're past the need for small chunks. |
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|
2079 if (current_chunk() != NULL) { |
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|
2080 // Only a small chunk or the initial chunk could be |
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|
2081 // the current chunk if this is the first medium chunk. |
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2082 assert(current_chunk()->word_size() == SpaceManager::SmallChunk || |
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2083 chunks_in_use(SmallIndex) == NULL, |
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2084 err_msg("Should be a small chunk or initial chunk, current chunk " |
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|
2085 SIZE_FORMAT " new chunk " SIZE_FORMAT, |
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2086 current_chunk()->word_size(), new_chunk->word_size())); |
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|
2087 current_chunk()->set_next(NULL); |
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|
2088 } |
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|
2089 // First chunk to add to the list |
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2090 set_chunks_in_use(MediumIndex, new_chunk); |
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|
2091 |
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|
2092 } else { |
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|
2093 // As a minimum the first medium chunk added would |
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|
2094 // have become the _current_chunk |
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|
2095 // so the _current_chunk has to be non-NULL here |
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|
2096 // (although not necessarily still the first medium chunk). |
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|
2097 assert(current_chunk()->word_size() == SpaceManager::MediumChunk, |
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|
2098 "A medium chunk should the current chunk"); |
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|
2099 current_chunk()->set_next(new_chunk); |
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|
2100 } |
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|
2101 // Make current chunk |
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|
2102 set_current_chunk(new_chunk); |
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|
2103 break; |
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|
2104 default: { |
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|
2105 // For null class loader data and DumpSharedSpaces, the first chunk isn't |
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|
2106 // small, so small will be null. Link this first chunk as the current |
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|
2107 // chunk. |
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|
2108 if (make_current) { |
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2109 // Set as the current chunk but otherwise treat as a humongous chunk. |
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|
2110 set_current_chunk(new_chunk); |
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|
2111 } |
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|
2112 // Link at head. The _current_chunk only points to a humongous chunk for |
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|
2113 // the null class loader metaspace (class and data virtual space managers) |
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|
2114 // any humongous chunks so will not point to the tail |
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|
2115 // of the humongous chunks list. |
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2116 new_chunk->set_next(chunks_in_use(HumongousIndex)); |
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|
2117 set_chunks_in_use(HumongousIndex, new_chunk); |
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|
2118 |
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|
2119 assert(new_chunk->word_size() > MediumChunk, "List inconsistency"); |
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|
2120 } |
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2121 } |
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2122 |
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2123 assert(new_chunk->is_empty(), "Not ready for reuse"); |
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2124 if (TraceMetadataChunkAllocation && Verbose) { |
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2125 gclog_or_tty->print("SpaceManager::add_chunk: %d) ", |
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2126 sum_count_in_chunks_in_use()); |
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2127 new_chunk->print_on(gclog_or_tty); |
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2128 vs_list()->chunk_manager()->locked_print_free_chunks(tty); |
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2129 } |
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2130 } |
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2131 |
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2132 MetaWord* SpaceManager::allocate(size_t word_size) { |
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2133 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
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2134 |
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2135 // If only the dictionary is going to be used (i.e., no |
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2136 // indexed free list), then there is a minimum size requirement. |
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2137 // MinChunkSize is a placeholder for the real minimum size JJJ |
6885 | 2138 size_t byte_size = word_size * BytesPerWord; |
2139 | |
2140 size_t byte_size_with_overhead = byte_size + Metablock::overhead(); | |
2141 | |
2142 size_t raw_bytes_size = MAX2(byte_size_with_overhead, | |
2143 Metablock::min_block_byte_size()); | |
2144 raw_bytes_size = ARENA_ALIGN(raw_bytes_size); | |
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2145 size_t raw_word_size = raw_bytes_size / BytesPerWord; |
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2146 assert(raw_word_size * BytesPerWord == raw_bytes_size, "Size problem"); |
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2147 |
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2148 BlockFreelist* fl = block_freelists(); |
6885 | 2149 MetaWord* p = NULL; |
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2150 // Allocation from the dictionary is expensive in the sense that |
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2151 // the dictionary has to be searched for a size. Don't allocate |
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2152 // from the dictionary until it starts to get fat. Is this |
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2153 // a reasonable policy? Maybe an skinny dictionary is fast enough |
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2154 // for allocations. Do some profiling. JJJ |
6885 | 2155 if (fl->total_size() > allocation_from_dictionary_limit) { |
2156 p = fl->get_block(raw_word_size); | |
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2157 } |
6885 | 2158 if (p == NULL) { |
2159 p = allocate_work(raw_word_size); | |
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2160 } |
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2161 Metadebug::deallocate_block_a_lot(this, raw_word_size); |
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2162 |
6885 | 2163 return p; |
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2164 } |
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2165 |
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2166 // Returns the address of spaced allocated for "word_size". |
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2167 // This methods does not know about blocks (Metablocks) |
6885 | 2168 MetaWord* SpaceManager::allocate_work(size_t word_size) { |
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2169 assert_lock_strong(_lock); |
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2170 #ifdef ASSERT |
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2171 if (Metadebug::test_metadata_failure()) { |
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2172 return NULL; |
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2173 } |
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2174 #endif |
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2175 // Is there space in the current chunk? |
6885 | 2176 MetaWord* result = NULL; |
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2177 |
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2178 // For DumpSharedSpaces, only allocate out of the current chunk which is |
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2179 // never null because we gave it the size we wanted. Caller reports out |
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2180 // of memory if this returns null. |
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2181 if (DumpSharedSpaces) { |
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2182 assert(current_chunk() != NULL, "should never happen"); |
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2183 inc_allocation_total(word_size); |
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2184 return current_chunk()->allocate(word_size); // caller handles null result |
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2185 } |
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2186 if (current_chunk() != NULL) { |
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2187 result = current_chunk()->allocate(word_size); |
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2188 } |
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2189 |
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2190 if (result == NULL) { |
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2191 result = grow_and_allocate(word_size); |
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2192 } |
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2193 if (result > 0) { |
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2194 inc_allocation_total(word_size); |
6885 | 2195 assert(result != (MetaWord*) chunks_in_use(MediumIndex), |
2196 "Head of the list is being allocated"); | |
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2197 } |
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2198 |
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2199 return result; |
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2200 } |
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2201 |
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2202 void SpaceManager::verify() { |
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2203 // If there are blocks in the dictionary, then |
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2204 // verfication of chunks does not work since |
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2205 // being in the dictionary alters a chunk. |
6885 | 2206 if (block_freelists()->total_size() == 0) { |
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2207 // Skip the small chunks because their next link points to |
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2208 // medium chunks. This is because the small chunk is the |
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2209 // current chunk (for allocations) until it is full and the |
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2210 // the addition of the next chunk does not NULL the next |
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2211 // like of the small chunk. |
6885 | 2212 for (ChunkIndex i = MediumIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
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2213 Metachunk* curr = chunks_in_use(i); |
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2214 while (curr != NULL) { |
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2215 curr->verify(); |
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2216 curr = curr->next(); |
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2217 } |
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2218 } |
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2219 } |
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2220 } |
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2221 |
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2222 #ifdef ASSERT |
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2223 void SpaceManager::verify_allocation_total() { |
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2224 #if 0 |
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2225 // Verification is only guaranteed at a safepoint. |
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2226 if (SafepointSynchronize::is_at_safepoint()) { |
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2227 gclog_or_tty->print_cr("Chunk " PTR_FORMAT " allocation_total " SIZE_FORMAT |
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2228 " sum_used_in_chunks_in_use " SIZE_FORMAT, |
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2229 this, |
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2230 allocation_total(), |
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2231 sum_used_in_chunks_in_use()); |
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2232 } |
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2233 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
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2234 assert(allocation_total() == sum_used_in_chunks_in_use(), |
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2235 err_msg("allocation total is not consistent %d vs %d", |
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2236 allocation_total(), sum_used_in_chunks_in_use())); |
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2237 #endif |
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2238 } |
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2239 |
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2240 #endif |
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2241 |
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2242 void SpaceManager::dump(outputStream* const out) const { |
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2243 size_t curr_total = 0; |
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2244 size_t waste = 0; |
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2245 uint i = 0; |
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2246 size_t used = 0; |
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2247 size_t capacity = 0; |
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2248 |
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2249 // Add up statistics for all chunks in this SpaceManager. |
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2250 for (ChunkIndex index = SmallIndex; |
6885 | 2251 index < NumberOfInUseLists; |
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2252 index = next_chunk_index(index)) { |
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2253 for (Metachunk* curr = chunks_in_use(index); |
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2254 curr != NULL; |
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2255 curr = curr->next()) { |
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2256 out->print("%d) ", i++); |
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2257 curr->print_on(out); |
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2258 if (TraceMetadataChunkAllocation && Verbose) { |
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2259 block_freelists()->print_on(out); |
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2260 } |
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2261 curr_total += curr->word_size(); |
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2262 used += curr->used_word_size(); |
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2263 capacity += curr->capacity_word_size(); |
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2264 waste += curr->free_word_size() + curr->overhead();; |
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2265 } |
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2266 } |
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2267 |
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2268 size_t free = current_chunk()->free_word_size(); |
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2269 // Free space isn't wasted. |
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2270 waste -= free; |
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|
2271 |
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2272 out->print_cr("total of all chunks " SIZE_FORMAT " used " SIZE_FORMAT |
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2273 " free " SIZE_FORMAT " capacity " SIZE_FORMAT |
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|
2274 " waste " SIZE_FORMAT, curr_total, used, free, capacity, waste); |
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|
2275 } |
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|
2276 |
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|
2277 #ifndef PRODUCT |
6725
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|
2278 void SpaceManager::mangle_freed_chunks() { |
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2279 for (ChunkIndex index = SmallIndex; |
6885 | 2280 index < NumberOfInUseLists; |
6725
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2281 index = next_chunk_index(index)) { |
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|
2282 for (Metachunk* curr = chunks_in_use(index); |
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2283 curr != NULL; |
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|
2284 curr = curr->next()) { |
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diff
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|
2285 // Try to detect incorrectly terminated small chunk |
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|
2286 // list. |
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|
2287 assert(index == MediumIndex || curr != chunks_in_use(MediumIndex), |
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2288 err_msg("Mangling medium chunks in small chunks? " |
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2289 "curr " PTR_FORMAT " medium list " PTR_FORMAT, |
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2290 curr, chunks_in_use(MediumIndex))); |
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|
2291 curr->mangle(); |
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|
2292 } |
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|
2293 } |
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|
2294 } |
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2295 #endif // PRODUCT |
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2296 |
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|
2297 |
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2298 // MetaspaceAux |
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|
2299 |
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2300 size_t MetaspaceAux::used_in_bytes() { |
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2301 return (Metaspace::class_space_list()->used_words_sum() + |
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2302 Metaspace::space_list()->used_words_sum()) * BytesPerWord; |
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2303 } |
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2304 |
6734 | 2305 size_t MetaspaceAux::used_in_bytes(Metaspace::MetadataType mdtype) { |
6730
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|
2306 size_t used = 0; |
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2307 ClassLoaderDataGraphMetaspaceIterator iter; |
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2308 while (iter.repeat()) { |
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2309 Metaspace* msp = iter.get_next(); |
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2310 // Sum allocation_total for each metaspace |
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2311 if (msp != NULL) { |
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2312 used += msp->used_words(mdtype); |
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2313 } |
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|
2314 } |
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2315 return used * BytesPerWord; |
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2316 } |
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|
2317 |
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2318 size_t MetaspaceAux::free_in_bytes(Metaspace::MetadataType mdtype) { |
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2319 size_t free = 0; |
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2320 ClassLoaderDataGraphMetaspaceIterator iter; |
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2321 while (iter.repeat()) { |
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2322 Metaspace* msp = iter.get_next(); |
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2323 if (msp != NULL) { |
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2324 free += msp->free_words(mdtype); |
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|
2325 } |
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|
2326 } |
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2327 return free * BytesPerWord; |
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|
2328 } |
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|
2329 |
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|
2330 // The total words available for metadata allocation. This |
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|
2331 // uses Metaspace capacity_words() which is the total words |
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2332 // in chunks allocated for a Metaspace. |
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2333 size_t MetaspaceAux::capacity_in_bytes() { |
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2334 return (Metaspace::class_space_list()->capacity_words_sum() + |
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|
2335 Metaspace::space_list()->capacity_words_sum()) * BytesPerWord; |
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|
2336 } |
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|
2337 |
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|
2338 size_t MetaspaceAux::capacity_in_bytes(Metaspace::MetadataType mdtype) { |
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|
2339 size_t capacity = free_chunks_total(mdtype); |
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|
2340 ClassLoaderDataGraphMetaspaceIterator iter; |
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|
2341 while (iter.repeat()) { |
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2342 Metaspace* msp = iter.get_next(); |
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2343 if (msp != NULL) { |
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|
2344 capacity += msp->capacity_words(mdtype); |
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|
2345 } |
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|
2346 } |
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|
2347 return capacity * BytesPerWord; |
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|
2348 } |
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|
2349 |
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2350 size_t MetaspaceAux::reserved_in_bytes() { |
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2351 return (Metaspace::class_space_list()->virtual_space_total() + |
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2352 Metaspace::space_list()->virtual_space_total()) * BytesPerWord; |
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2353 } |
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|
2354 |
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|
2355 size_t MetaspaceAux::reserved_in_bytes(Metaspace::MetadataType mdtype) { |
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|
2356 size_t reserved = (mdtype == Metaspace::ClassType) ? |
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|
2357 Metaspace::class_space_list()->virtual_space_total() : |
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|
2358 Metaspace::space_list()->virtual_space_total(); |
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|
2359 return reserved * BytesPerWord; |
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|
2360 } |
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|
2361 |
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|
2362 size_t MetaspaceAux::min_chunk_size() { return SpaceManager::MediumChunk; } |
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|
2363 |
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|
2364 size_t MetaspaceAux::free_chunks_total(Metaspace::MetadataType mdtype) { |
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2365 ChunkManager* chunk = (mdtype == Metaspace::ClassType) ? |
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|
2366 Metaspace::class_space_list()->chunk_manager() : |
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|
2367 Metaspace::space_list()->chunk_manager(); |
6969
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7200229: NPG: possible performance issue exposed by closed/runtime/6559877/Test6559877.java
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parents:
6885
diff
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|
2368 chunk->slow_verify(); |
6725
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|
2369 return chunk->free_chunks_total(); |
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|
2370 } |
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|
2371 |
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|
2372 size_t MetaspaceAux::free_chunks_total_in_bytes(Metaspace::MetadataType mdtype) { |
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|
2373 return free_chunks_total(mdtype) * BytesPerWord; |
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|
2374 } |
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|
2375 |
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|
2376 void MetaspaceAux::print_metaspace_change(size_t prev_metadata_used) { |
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|
2377 gclog_or_tty->print(", [Metaspace:"); |
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|
2378 if (PrintGCDetails && Verbose) { |
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|
2379 gclog_or_tty->print(" " SIZE_FORMAT |
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|
2380 "->" SIZE_FORMAT |
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|
2381 "(" SIZE_FORMAT "/" SIZE_FORMAT ")", |
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|
2382 prev_metadata_used, |
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|
2383 used_in_bytes(), |
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|
2384 capacity_in_bytes(), |
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|
2385 reserved_in_bytes()); |
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|
2386 } else { |
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|
2387 gclog_or_tty->print(" " SIZE_FORMAT "K" |
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|
2388 "->" SIZE_FORMAT "K" |
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|
2389 "(" SIZE_FORMAT "K/" SIZE_FORMAT "K)", |
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|
2390 prev_metadata_used / K, |
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|
2391 used_in_bytes()/ K, |
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|
2392 capacity_in_bytes()/K, |
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|
2393 reserved_in_bytes()/ K); |
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|
2394 } |
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|
2395 |
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|
2396 gclog_or_tty->print("]"); |
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|
2397 } |
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diff
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|
2398 |
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diff
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|
2399 // This is printed when PrintGCDetails |
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6964458: Reimplement class meta-data storage to use native memory
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diff
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|
2400 void MetaspaceAux::print_on(outputStream* out) { |
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6964458: Reimplement class meta-data storage to use native memory
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|
2401 Metaspace::MetadataType ct = Metaspace::ClassType; |
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6964458: Reimplement class meta-data storage to use native memory
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parents:
diff
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|
2402 Metaspace::MetadataType nct = Metaspace::NonClassType; |
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6964458: Reimplement class meta-data storage to use native memory
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parents:
diff
changeset
|
2403 |
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6964458: Reimplement class meta-data storage to use native memory
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parents:
diff
changeset
|
2404 out->print_cr(" Metaspace total " |
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6964458: Reimplement class meta-data storage to use native memory
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parents:
diff
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|
2405 SIZE_FORMAT "K, used " SIZE_FORMAT "K," |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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parents:
diff
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|
2406 " reserved " SIZE_FORMAT "K", |
6734 | 2407 capacity_in_bytes()/K, used_in_bytes()/K, reserved_in_bytes()/K); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2408 out->print_cr(" data space " |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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parents:
diff
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|
2409 SIZE_FORMAT "K, used " SIZE_FORMAT "K," |
da91efe96a93
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parents:
diff
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|
2410 " reserved " SIZE_FORMAT "K", |
6734 | 2411 capacity_in_bytes(nct)/K, used_in_bytes(nct)/K, reserved_in_bytes(nct)/K); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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parents:
diff
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|
2412 out->print_cr(" class space " |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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diff
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|
2413 SIZE_FORMAT "K, used " SIZE_FORMAT "K," |
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diff
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|
2414 " reserved " SIZE_FORMAT "K", |
6734 | 2415 capacity_in_bytes(ct)/K, used_in_bytes(ct)/K, reserved_in_bytes(ct)/K); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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parents:
diff
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|
2416 } |
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parents:
diff
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|
2417 |
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parents:
diff
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|
2418 // Print information for class space and data space separately. |
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parents:
diff
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|
2419 // This is almost the same as above. |
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|
2420 void MetaspaceAux::print_on(outputStream* out, Metaspace::MetadataType mdtype) { |
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|
2421 size_t free_chunks_capacity_bytes = free_chunks_total_in_bytes(mdtype); |
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|
2422 size_t capacity_bytes = capacity_in_bytes(mdtype); |
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|
2423 size_t used_bytes = used_in_bytes(mdtype); |
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|
2424 size_t free_bytes = free_in_bytes(mdtype); |
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2425 size_t used_and_free = used_bytes + free_bytes + |
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|
2426 free_chunks_capacity_bytes; |
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|
2427 out->print_cr(" Chunk accounting: used in chunks " SIZE_FORMAT |
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|
2428 "K + unused in chunks " SIZE_FORMAT "K + " |
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diff
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|
2429 " capacity in free chunks " SIZE_FORMAT "K = " SIZE_FORMAT |
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|
2430 "K capacity in allocated chunks " SIZE_FORMAT "K", |
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|
2431 used_bytes / K, |
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diff
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|
2432 free_bytes / K, |
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|
2433 free_chunks_capacity_bytes / K, |
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diff
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|
2434 used_and_free / K, |
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|
2435 capacity_bytes / K); |
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|
2436 assert(used_and_free == capacity_bytes, "Accounting is wrong"); |
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diff
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|
2437 } |
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diff
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|
2438 |
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parents:
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|
2439 // Print total fragmentation for class and data metaspaces separately |
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|
2440 void MetaspaceAux::print_waste(outputStream* out) { |
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diff
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|
2441 |
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|
2442 size_t small_waste = 0, medium_waste = 0, large_waste = 0; |
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|
2443 size_t cls_small_waste = 0, cls_medium_waste = 0, cls_large_waste = 0; |
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|
2444 |
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|
2445 ClassLoaderDataGraphMetaspaceIterator iter; |
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diff
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|
2446 while (iter.repeat()) { |
da91efe96a93
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|
2447 Metaspace* msp = iter.get_next(); |
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diff
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|
2448 if (msp != NULL) { |
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|
2449 small_waste += msp->vsm()->sum_waste_in_chunks_in_use(SmallIndex); |
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|
2450 medium_waste += msp->vsm()->sum_waste_in_chunks_in_use(MediumIndex); |
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|
2451 large_waste += msp->vsm()->sum_waste_in_chunks_in_use(HumongousIndex); |
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|
2452 |
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|
2453 cls_small_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SmallIndex); |
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|
2454 cls_medium_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(MediumIndex); |
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|
2455 cls_large_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(HumongousIndex); |
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|
2456 } |
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diff
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|
2457 } |
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|
2458 out->print_cr("Total fragmentation waste (words) doesn't count free space"); |
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diff
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|
2459 out->print(" data: small " SIZE_FORMAT " medium " SIZE_FORMAT, |
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|
2460 small_waste, medium_waste); |
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|
2461 out->print_cr(" class: small " SIZE_FORMAT, cls_small_waste); |
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diff
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|
2462 } |
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diff
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|
2463 |
da91efe96a93
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|
2464 // Dump global metaspace things from the end of ClassLoaderDataGraph |
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|
2465 void MetaspaceAux::dump(outputStream* out) { |
da91efe96a93
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parents:
diff
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|
2466 out->print_cr("All Metaspace:"); |
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|
2467 out->print("data space: "); print_on(out, Metaspace::NonClassType); |
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diff
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|
2468 out->print("class space: "); print_on(out, Metaspace::ClassType); |
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diff
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|
2469 print_waste(out); |
da91efe96a93
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diff
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|
2470 } |
da91efe96a93
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diff
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|
2471 |
6969
6bc207d87e5d
7200229: NPG: possible performance issue exposed by closed/runtime/6559877/Test6559877.java
mgerdin
parents:
6885
diff
changeset
|
2472 void MetaspaceAux::verify_free_chunks() { |
6bc207d87e5d
7200229: NPG: possible performance issue exposed by closed/runtime/6559877/Test6559877.java
mgerdin
parents:
6885
diff
changeset
|
2473 Metaspace::space_list()->chunk_manager()->verify(); |
6bc207d87e5d
7200229: NPG: possible performance issue exposed by closed/runtime/6559877/Test6559877.java
mgerdin
parents:
6885
diff
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|
2474 Metaspace::class_space_list()->chunk_manager()->verify(); |
6bc207d87e5d
7200229: NPG: possible performance issue exposed by closed/runtime/6559877/Test6559877.java
mgerdin
parents:
6885
diff
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|
2475 } |
6bc207d87e5d
7200229: NPG: possible performance issue exposed by closed/runtime/6559877/Test6559877.java
mgerdin
parents:
6885
diff
changeset
|
2476 |
6725
da91efe96a93
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coleenp
parents:
diff
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|
2477 // Metaspace methods |
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6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
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|
2478 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
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|
2479 size_t Metaspace::_first_chunk_word_size = 0; |
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6964458: Reimplement class meta-data storage to use native memory
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diff
changeset
|
2480 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
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|
2481 Metaspace::Metaspace(Mutex* lock, size_t word_size) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2482 initialize(lock, word_size); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2483 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2484 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
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|
2485 Metaspace::Metaspace(Mutex* lock) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2486 initialize(lock); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2487 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2488 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2489 Metaspace::~Metaspace() { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2490 delete _vsm; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2491 delete _class_vsm; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2492 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2493 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
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|
2494 VirtualSpaceList* Metaspace::_space_list = NULL; |
da91efe96a93
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coleenp
parents:
diff
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|
2495 VirtualSpaceList* Metaspace::_class_space_list = NULL; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
changeset
|
2496 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2497 #define VIRTUALSPACEMULTIPLIER 2 |
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coleenp
parents:
diff
changeset
|
2498 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2499 void Metaspace::global_initialize() { |
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6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
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|
2500 // Initialize the alignment for shared spaces. |
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diff
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|
2501 int max_alignment = os::vm_page_size(); |
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coleenp
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diff
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|
2502 MetaspaceShared::set_max_alignment(max_alignment); |
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coleenp
parents:
diff
changeset
|
2503 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
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|
2504 if (DumpSharedSpaces) { |
da91efe96a93
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coleenp
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diff
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|
2505 SharedReadOnlySize = align_size_up(SharedReadOnlySize, max_alignment); |
da91efe96a93
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coleenp
parents:
diff
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|
2506 SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment); |
da91efe96a93
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coleenp
parents:
diff
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|
2507 SharedMiscDataSize = align_size_up(SharedMiscDataSize, max_alignment); |
da91efe96a93
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coleenp
parents:
diff
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|
2508 SharedMiscCodeSize = align_size_up(SharedMiscCodeSize, max_alignment); |
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coleenp
parents:
diff
changeset
|
2509 |
da91efe96a93
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coleenp
parents:
diff
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|
2510 // Initialize with the sum of the shared space sizes. The read-only |
da91efe96a93
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coleenp
parents:
diff
changeset
|
2511 // and read write metaspace chunks will be allocated out of this and the |
da91efe96a93
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coleenp
parents:
diff
changeset
|
2512 // remainder is the misc code and data chunks. |
da91efe96a93
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coleenp
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diff
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|
2513 size_t total = align_size_up(SharedReadOnlySize + SharedReadWriteSize + |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2514 SharedMiscDataSize + SharedMiscCodeSize, |
da91efe96a93
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coleenp
parents:
diff
changeset
|
2515 os::vm_allocation_granularity()); |
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coleenp
parents:
diff
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|
2516 size_t word_size = total/wordSize; |
da91efe96a93
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coleenp
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diff
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|
2517 _space_list = new VirtualSpaceList(word_size); |
da91efe96a93
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coleenp
parents:
diff
changeset
|
2518 } else { |
da91efe96a93
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diff
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|
2519 // If using shared space, open the file that contains the shared space |
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coleenp
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diff
changeset
|
2520 // and map in the memory before initializing the rest of metaspace (so |
da91efe96a93
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coleenp
parents:
diff
changeset
|
2521 // the addresses don't conflict) |
da91efe96a93
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coleenp
parents:
diff
changeset
|
2522 if (UseSharedSpaces) { |
da91efe96a93
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coleenp
parents:
diff
changeset
|
2523 FileMapInfo* mapinfo = new FileMapInfo(); |
da91efe96a93
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coleenp
parents:
diff
changeset
|
2524 memset(mapinfo, 0, sizeof(FileMapInfo)); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2525 |
da91efe96a93
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coleenp
parents:
diff
changeset
|
2526 // Open the shared archive file, read and validate the header. If |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2527 // initialization fails, shared spaces [UseSharedSpaces] are |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2528 // disabled and the file is closed. |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2529 // Map in spaces now also |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2530 if (mapinfo->initialize() && MetaspaceShared::map_shared_spaces(mapinfo)) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2531 FileMapInfo::set_current_info(mapinfo); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2532 } else { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2533 assert(!mapinfo->is_open() && !UseSharedSpaces, |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2534 "archive file not closed or shared spaces not disabled."); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2535 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2536 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2537 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2538 // Initialize this before initializing the VirtualSpaceList |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2539 _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2540 // Arbitrarily set the initial virtual space to a multiple |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2541 // of the boot class loader size. |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2542 size_t word_size = VIRTUALSPACEMULTIPLIER * Metaspace::first_chunk_word_size(); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2543 // Initialize the list of virtual spaces. |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2544 _space_list = new VirtualSpaceList(word_size); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2545 } |
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 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2548 // 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
changeset
|
2549 // 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
|
2550 // argument passed in is at the top of the compressed space |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2551 void Metaspace::initialize_class_space(ReservedSpace rs) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2552 // The reserved space size may be bigger because of alignment, esp with UseLargePages |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2553 assert(rs.size() >= ClassMetaspaceSize, err_msg("%d != %d", rs.size(), ClassMetaspaceSize)); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2554 _class_space_list = new VirtualSpaceList(rs); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2555 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2556 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2557 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2558 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
parents:
6734
diff
changeset
|
2559 // 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
parents:
6734
diff
changeset
|
2560 // the data metaspace. |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2561 size_t word_size; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2562 size_t class_word_size; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2563 if (initial_size == 0) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2564 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
|
2565 class_word_size = (size_t) SpaceManager::SmallChunk; |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2566 } else { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2567 word_size = initial_size; |
6736
11fb740ce98f
7196103: NPG: Unable to allocate bit map for parallel garbage collection for the requested heap size
coleenp
parents:
6734
diff
changeset
|
2568 // 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
|
2569 // 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
parents:
6734
diff
changeset
|
2570 // 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
parents:
6734
diff
changeset
|
2571 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
|
2572 (ClassMetaspaceSize/BytesPerWord)*2); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2573 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2574 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2575 assert(space_list() != NULL, |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2576 "Metadata VirtualSpaceList has not been initialized"); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2577 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2578 _vsm = new SpaceManager(lock, space_list()); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2579 if (_vsm == NULL) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2580 return; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2581 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2582 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2583 assert(class_space_list() != NULL, |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2584 "Class VirtualSpaceList has not been initialized"); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2585 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2586 // Allocate SpaceManager for classes. |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2587 _class_vsm = new SpaceManager(lock, class_space_list()); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2588 if (_class_vsm == NULL) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2589 return; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2590 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2591 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2592 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
|
2593 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2594 // Allocate chunk for metadata objects |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2595 Metachunk* new_chunk = |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2596 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
|
2597 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
|
2598 if (new_chunk != NULL) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2599 // 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
|
2600 vsm()->add_chunk(new_chunk, true); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2601 } |
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 // Allocate chunk for class metadata objects |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2604 Metachunk* class_chunk = |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2605 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
|
2606 if (class_chunk != NULL) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2607 class_vsm()->add_chunk(class_chunk, true); |
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 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2611 MetaWord* Metaspace::allocate(size_t word_size, MetadataType mdtype) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2612 // DumpSharedSpaces doesn't use class metadata area (yet) |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2613 if (mdtype == ClassType && !DumpSharedSpaces) { |
6885 | 2614 return class_vsm()->allocate(word_size); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2615 } else { |
6885 | 2616 return vsm()->allocate(word_size); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2617 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2618 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2619 |
6753
8da5e203b993
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
6736
diff
changeset
|
2620 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
|
2621 MetaWord* result; |
8da5e203b993
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
6736
diff
changeset
|
2622 MetaspaceGC::set_expand_after_GC(true); |
8da5e203b993
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
6736
diff
changeset
|
2623 size_t before_inc = MetaspaceGC::capacity_until_GC(); |
8da5e203b993
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
6736
diff
changeset
|
2624 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
|
2625 MetaspaceGC::inc_capacity_until_GC(delta_words); |
8da5e203b993
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
6736
diff
changeset
|
2626 if (PrintGCDetails && Verbose) { |
8da5e203b993
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
6736
diff
changeset
|
2627 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
|
2628 " 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
|
2629 } |
6885 | 2630 |
6753
8da5e203b993
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
6736
diff
changeset
|
2631 result = allocate(word_size, mdtype); |
8da5e203b993
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
6736
diff
changeset
|
2632 |
8da5e203b993
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
6736
diff
changeset
|
2633 return result; |
8da5e203b993
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
6736
diff
changeset
|
2634 } |
8da5e203b993
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
6736
diff
changeset
|
2635 |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2636 // Space allocated in the Metaspace. This may |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2637 // be across several metadata virtual spaces. |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2638 char* Metaspace::bottom() const { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2639 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
|
2640 return (char*)vsm()->current_chunk()->bottom(); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2641 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2642 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2643 size_t Metaspace::used_words(MetadataType mdtype) const { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2644 // return vsm()->allocation_total(); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2645 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
|
2646 vsm()->sum_used_in_chunks_in_use(); // includes overhead! |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2647 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2648 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2649 size_t Metaspace::free_words(MetadataType mdtype) const { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2650 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
|
2651 vsm()->sum_free_in_chunks_in_use(); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2652 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2653 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2654 // Space capacity in the Metaspace. It includes |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2655 // space in the list of chunks from which allocations |
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2656 // have been made. Don't include space in the global freelist and |
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2657 // in the space available in the dictionary which |
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2658 // is already counted in some chunk. |
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2659 size_t Metaspace::capacity_words(MetadataType mdtype) const { |
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2660 return mdtype == ClassType ? class_vsm()->sum_capacity_in_chunks_in_use() : |
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2661 vsm()->sum_capacity_in_chunks_in_use(); |
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2662 } |
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2663 |
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2664 void Metaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) { |
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2665 if (SafepointSynchronize::is_at_safepoint()) { |
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2666 assert(Thread::current()->is_VM_thread(), "should be the VM thread"); |
6885 | 2667 // Don't take Heap_lock |
2668 MutexLocker ml(vsm()->lock()); | |
2669 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) { | |
2670 // Dark matter. Too small for dictionary. | |
2671 #ifdef ASSERT | |
2672 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5); | |
2673 #endif | |
2674 return; | |
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2675 } |
6885 | 2676 if (is_class) { |
2677 class_vsm()->deallocate(ptr, word_size); | |
2678 } else { | |
2679 vsm()->deallocate(ptr, word_size); | |
2680 } | |
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2681 } else { |
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2682 MutexLocker ml(vsm()->lock()); |
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2683 |
6885 | 2684 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) { |
2685 // Dark matter. Too small for dictionary. | |
2686 #ifdef ASSERT | |
2687 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5); | |
2688 #endif | |
2689 return; | |
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2690 } |
6885 | 2691 if (is_class) { |
2692 class_vsm()->deallocate(ptr, word_size); | |
2693 } else { | |
2694 vsm()->deallocate(ptr, word_size); | |
2695 } | |
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2696 } |
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2697 } |
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2698 |
6885 | 2699 Metablock* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size, |
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2700 bool read_only, MetadataType mdtype, TRAPS) { |
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2701 if (HAS_PENDING_EXCEPTION) { |
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2702 assert(false, "Should not allocate with exception pending"); |
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2703 return NULL; // caller does a CHECK_NULL too |
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2704 } |
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2705 |
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2706 // SSS: Should we align the allocations and make sure the sizes are aligned. |
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2707 MetaWord* result = NULL; |
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2708 |
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2709 assert(loader_data != NULL, "Should never pass around a NULL loader_data. " |
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2710 "ClassLoaderData::the_null_class_loader_data() should have been used."); |
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2711 // Allocate in metaspaces without taking out a lock, because it deadlocks |
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2712 // with the SymbolTable_lock. Dumping is single threaded for now. We'll have |
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2713 // to revisit this for application class data sharing. |
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2714 if (DumpSharedSpaces) { |
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2715 if (read_only) { |
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2716 result = loader_data->ro_metaspace()->allocate(word_size, NonClassType); |
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2717 } else { |
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2718 result = loader_data->rw_metaspace()->allocate(word_size, NonClassType); |
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2719 } |
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2720 if (result == NULL) { |
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2721 report_out_of_shared_space(read_only ? SharedReadOnly : SharedReadWrite); |
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2722 } |
6885 | 2723 return Metablock::initialize(result, word_size); |
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2724 } |
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2725 |
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2726 result = loader_data->metaspace_non_null()->allocate(word_size, mdtype); |
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2727 |
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2728 if (result == NULL) { |
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2729 // Try to clean out some memory and retry. |
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2730 result = |
6885 | 2731 Universe::heap()->collector_policy()->satisfy_failed_metadata_allocation( |
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2732 loader_data, word_size, mdtype); |
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2733 |
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2734 // If result is still null, we are out of memory. |
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2735 if (result == NULL) { |
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2736 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support |
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2737 report_java_out_of_memory("Metadata space"); |
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2738 |
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2739 if (JvmtiExport::should_post_resource_exhausted()) { |
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2740 JvmtiExport::post_resource_exhausted( |
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2741 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR, |
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2742 "Metadata space"); |
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2743 } |
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2744 THROW_OOP_0(Universe::out_of_memory_error_perm_gen()); |
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2745 } |
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2746 } |
6885 | 2747 return Metablock::initialize(result, word_size); |
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2748 } |
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2749 |
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2750 void Metaspace::print_on(outputStream* out) const { |
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2751 // Print both class virtual space counts and metaspace. |
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2752 if (Verbose) { |
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2753 vsm()->print_on(out); |
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2754 class_vsm()->print_on(out); |
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2755 } |
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2756 } |
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2757 |
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2758 #ifndef PRODUCT |
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2759 bool Metaspace::contains(const void * ptr) const { |
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2760 if (MetaspaceShared::is_in_shared_space(ptr)) { |
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2761 return true; |
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2762 } |
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2763 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag); |
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2764 return space_list()->contains(ptr) || class_space_list()->contains(ptr); |
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2765 } |
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2766 #endif |
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2767 |
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2768 void Metaspace::verify() { |
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2769 vsm()->verify(); |
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2770 class_vsm()->verify(); |
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2771 } |
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2772 |
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2773 void Metaspace::dump(outputStream* const out) const { |
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2774 if (UseMallocOnly) { |
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2775 // Just print usage for now |
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2776 out->print_cr("usage %d", used_words(Metaspace::NonClassType)); |
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2777 } |
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2778 out->print_cr("\nVirtual space manager: " INTPTR_FORMAT, vsm()); |
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2779 vsm()->dump(out); |
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2780 out->print_cr("\nClass space manager: " INTPTR_FORMAT, class_vsm()); |
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2781 class_vsm()->dump(out); |
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2782 } |