Mercurial > hg > truffle
annotate src/share/vm/memory/metaspace.cpp @ 8125:0026a2e70695
Merge fixes.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Tue, 05 Mar 2013 23:58:57 +0100 |
parents | a83cd101fd62 |
children | 3efdfd6ddbf2 1c88b99a2b01 |
rev | line source |
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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 "runtime/orderAccess.hpp" |
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40 #include "services/memTracker.hpp" |
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41 #include "utilities/copy.hpp" |
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42 #include "utilities/debug.hpp" |
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43 |
6885 | 44 typedef BinaryTreeDictionary<Metablock, FreeList> BlockTreeDictionary; |
45 typedef BinaryTreeDictionary<Metachunk, FreeList> ChunkTreeDictionary; | |
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46 // Define this macro to enable slow integrity checking of |
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47 // the free chunk lists |
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48 const bool metaspace_slow_verify = false; |
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49 |
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50 |
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51 // Parameters for stress mode testing |
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52 const uint metadata_deallocate_a_lot_block = 10; |
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53 const uint metadata_deallocate_a_lock_chunk = 3; |
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54 size_t const allocation_from_dictionary_limit = 64 * K; |
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55 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 ZeroIndex = 0, |
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62 SpecializedIndex = ZeroIndex, |
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63 SmallIndex = SpecializedIndex + 1, |
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64 MediumIndex = SmallIndex + 1, |
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65 HumongousIndex = MediumIndex + 1, |
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66 NumberOfFreeLists = 3, |
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67 NumberOfInUseLists = 4 |
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68 }; |
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69 |
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70 enum ChunkSizes { // in words. |
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71 ClassSpecializedChunk = 128, |
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72 SpecializedChunk = 128, |
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73 ClassSmallChunk = 256, |
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74 SmallChunk = 512, |
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75 ClassMediumChunk = 1 * K, |
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76 MediumChunk = 8 * K, |
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77 HumongousChunkGranularity = 8 |
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78 }; |
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79 |
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80 static ChunkIndex next_chunk_index(ChunkIndex i) { |
6885 | 81 assert(i < NumberOfInUseLists, "Out of bound"); |
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82 return (ChunkIndex) (i+1); |
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83 } |
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84 |
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85 // Originally _capacity_until_GC was set to MetaspaceSize here but |
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86 // the default MetaspaceSize before argument processing was being |
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87 // used which was not the desired value. See the code |
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88 // in should_expand() to see how the initialization is handled |
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89 // now. |
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90 size_t MetaspaceGC::_capacity_until_GC = 0; |
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91 bool MetaspaceGC::_expand_after_GC = false; |
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92 uint MetaspaceGC::_shrink_factor = 0; |
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93 bool MetaspaceGC::_should_concurrent_collect = false; |
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94 |
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95 // Blocks of space for metadata are allocated out of Metachunks. |
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96 // |
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97 // Metachunk are allocated out of MetadataVirtualspaces and once |
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98 // allocated there is no explicit link between a Metachunk and |
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99 // the MetadataVirtualspaces from which it was allocated. |
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100 // |
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101 // Each SpaceManager maintains a |
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102 // list of the chunks it is using and the current chunk. The current |
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103 // chunk is the chunk from which allocations are done. Space freed in |
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104 // a chunk is placed on the free list of blocks (BlockFreelist) and |
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105 // reused from there. |
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106 |
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107 // Pointer to list of Metachunks. |
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108 class ChunkList VALUE_OBJ_CLASS_SPEC { |
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109 // List of free chunks |
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110 Metachunk* _head; |
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111 |
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112 public: |
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113 // Constructor |
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114 ChunkList() : _head(NULL) {} |
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115 |
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116 // Accessors |
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117 Metachunk* head() { return _head; } |
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118 void set_head(Metachunk* v) { _head = v; } |
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119 |
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120 // Link at head of the list |
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121 void add_at_head(Metachunk* head, Metachunk* tail); |
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122 void add_at_head(Metachunk* head); |
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123 |
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124 size_t sum_list_size(); |
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125 size_t sum_list_count(); |
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126 size_t sum_list_capacity(); |
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127 }; |
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128 |
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129 // Manages the global free lists of chunks. |
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130 // Has three lists of free chunks, and a total size and |
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131 // count that includes all three |
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132 |
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133 class ChunkManager VALUE_OBJ_CLASS_SPEC { |
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134 |
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135 // Free list of chunks of different sizes. |
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136 // SmallChunk |
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137 // MediumChunk |
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138 // HumongousChunk |
6885 | 139 ChunkList _free_chunks[NumberOfFreeLists]; |
140 | |
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141 |
6885 | 142 // HumongousChunk |
143 ChunkTreeDictionary _humongous_dictionary; | |
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144 |
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145 // ChunkManager in all lists of this type |
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146 size_t _free_chunks_total; |
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147 size_t _free_chunks_count; |
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148 |
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149 void dec_free_chunks_total(size_t v) { |
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150 assert(_free_chunks_count > 0 && |
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151 _free_chunks_total > 0, |
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152 "About to go negative"); |
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153 Atomic::add_ptr(-1, &_free_chunks_count); |
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154 jlong minus_v = (jlong) - (jlong) v; |
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155 Atomic::add_ptr(minus_v, &_free_chunks_total); |
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156 } |
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157 |
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158 // Debug support |
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159 |
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160 size_t sum_free_chunks(); |
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161 size_t sum_free_chunks_count(); |
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162 |
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163 void locked_verify_free_chunks_total(); |
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164 void slow_locked_verify_free_chunks_total() { |
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165 if (metaspace_slow_verify) { |
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166 locked_verify_free_chunks_total(); |
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167 } |
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168 } |
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169 void locked_verify_free_chunks_count(); |
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170 void slow_locked_verify_free_chunks_count() { |
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171 if (metaspace_slow_verify) { |
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172 locked_verify_free_chunks_count(); |
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173 } |
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174 } |
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175 void verify_free_chunks_count(); |
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176 |
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177 public: |
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178 |
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179 ChunkManager() : _free_chunks_total(0), _free_chunks_count(0) {} |
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180 |
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181 // add or delete (return) a chunk to the global freelist. |
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182 Metachunk* chunk_freelist_allocate(size_t word_size); |
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183 void chunk_freelist_deallocate(Metachunk* chunk); |
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184 |
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185 // Map a size to a list index assuming that there are lists |
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186 // for special, small, medium, and humongous chunks. |
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187 static ChunkIndex list_index(size_t size); |
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188 |
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189 // Total of the space in the free chunks list |
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190 size_t free_chunks_total(); |
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191 size_t free_chunks_total_in_bytes(); |
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192 |
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193 // Number of chunks in the free chunks list |
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194 size_t free_chunks_count(); |
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195 |
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196 void inc_free_chunks_total(size_t v, size_t count = 1) { |
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197 Atomic::add_ptr(count, &_free_chunks_count); |
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198 Atomic::add_ptr(v, &_free_chunks_total); |
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199 } |
6885 | 200 ChunkTreeDictionary* humongous_dictionary() { |
201 return &_humongous_dictionary; | |
202 } | |
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203 |
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204 ChunkList* free_chunks(ChunkIndex index); |
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205 |
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206 // Returns the list for the given chunk word size. |
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207 ChunkList* find_free_chunks_list(size_t word_size); |
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208 |
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209 // Add and remove from a list by size. Selects |
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210 // list based on size of chunk. |
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211 void free_chunks_put(Metachunk* chuck); |
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212 Metachunk* free_chunks_get(size_t chunk_word_size); |
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213 |
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214 // Debug support |
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215 void verify(); |
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216 void slow_verify() { |
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217 if (metaspace_slow_verify) { |
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218 verify(); |
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219 } |
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220 } |
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221 void locked_verify(); |
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222 void slow_locked_verify() { |
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223 if (metaspace_slow_verify) { |
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224 locked_verify(); |
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225 } |
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226 } |
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227 void verify_free_chunks_total(); |
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228 |
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229 void locked_print_free_chunks(outputStream* st); |
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230 void locked_print_sum_free_chunks(outputStream* st); |
6885 | 231 |
232 void print_on(outputStream* st); | |
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233 }; |
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234 |
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235 |
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236 // Used to manage the free list of Metablocks (a block corresponds |
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237 // to the allocation of a quantum of metadata). |
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238 class BlockFreelist VALUE_OBJ_CLASS_SPEC { |
6885 | 239 BlockTreeDictionary* _dictionary; |
240 static Metablock* initialize_free_chunk(MetaWord* p, size_t word_size); | |
241 | |
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242 // Accessors |
6885 | 243 BlockTreeDictionary* dictionary() const { return _dictionary; } |
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244 |
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245 public: |
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246 BlockFreelist(); |
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247 ~BlockFreelist(); |
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248 |
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249 // Get and return a block to the free list |
6885 | 250 MetaWord* get_block(size_t word_size); |
251 void return_block(MetaWord* p, size_t word_size); | |
252 | |
253 size_t total_size() { | |
254 if (dictionary() == NULL) { | |
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255 return 0; |
6885 | 256 } else { |
257 return dictionary()->total_size(); | |
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258 } |
6885 | 259 } |
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260 |
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261 void print_on(outputStream* st) const; |
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262 }; |
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263 |
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264 class VirtualSpaceNode : public CHeapObj<mtClass> { |
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265 friend class VirtualSpaceList; |
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266 |
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267 // Link to next VirtualSpaceNode |
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268 VirtualSpaceNode* _next; |
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269 |
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270 // total in the VirtualSpace |
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271 MemRegion _reserved; |
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272 ReservedSpace _rs; |
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273 VirtualSpace _virtual_space; |
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274 MetaWord* _top; |
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275 |
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276 // Convenience functions for logical bottom and end |
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277 MetaWord* bottom() const { return (MetaWord*) _virtual_space.low(); } |
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278 MetaWord* end() const { return (MetaWord*) _virtual_space.high(); } |
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279 |
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280 // Convenience functions to access the _virtual_space |
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281 char* low() const { return virtual_space()->low(); } |
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282 char* high() const { return virtual_space()->high(); } |
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283 |
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284 public: |
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285 |
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286 VirtualSpaceNode(size_t byte_size); |
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287 VirtualSpaceNode(ReservedSpace rs) : _top(NULL), _next(NULL), _rs(rs) {} |
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288 ~VirtualSpaceNode(); |
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289 |
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290 // address of next available space in _virtual_space; |
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291 // Accessors |
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292 VirtualSpaceNode* next() { return _next; } |
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293 void set_next(VirtualSpaceNode* v) { _next = v; } |
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294 |
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295 void set_reserved(MemRegion const v) { _reserved = v; } |
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296 void set_top(MetaWord* v) { _top = v; } |
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297 |
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298 // Accessors |
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299 MemRegion* reserved() { return &_reserved; } |
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300 VirtualSpace* virtual_space() const { return (VirtualSpace*) &_virtual_space; } |
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301 |
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302 // Returns true if "word_size" is available in the virtual space |
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303 bool is_available(size_t word_size) { return _top + word_size <= end(); } |
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304 |
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305 MetaWord* top() const { return _top; } |
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306 void inc_top(size_t word_size) { _top += word_size; } |
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307 |
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308 // used and capacity in this single entry in the list |
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309 size_t used_words_in_vs() const; |
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310 size_t capacity_words_in_vs() const; |
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311 |
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312 bool initialize(); |
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313 |
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314 // get space from the virtual space |
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315 Metachunk* take_from_committed(size_t chunk_word_size); |
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316 |
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317 // Allocate a chunk from the virtual space and return it. |
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318 Metachunk* get_chunk_vs(size_t chunk_word_size); |
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319 Metachunk* get_chunk_vs_with_expand(size_t chunk_word_size); |
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320 |
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321 // Expands/shrinks the committed space in a virtual space. Delegates |
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322 // to Virtualspace |
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323 bool expand_by(size_t words, bool pre_touch = false); |
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324 bool shrink_by(size_t words); |
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325 |
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326 #ifdef ASSERT |
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327 // Debug support |
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328 static void verify_virtual_space_total(); |
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329 static void verify_virtual_space_count(); |
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330 void mangle(); |
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331 #endif |
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332 |
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333 void print_on(outputStream* st) const; |
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334 }; |
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335 |
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336 // byte_size is the size of the associated virtualspace. |
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337 VirtualSpaceNode::VirtualSpaceNode(size_t byte_size) : _top(NULL), _next(NULL), _rs(0) { |
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338 // This allocates memory with mmap. For DumpSharedspaces, allocate the |
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339 // space at low memory so that other shared images don't conflict. |
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340 // This is the same address as memory needed for UseCompressedOops but |
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341 // compressed oops don't work with CDS (offsets in metadata are wrong), so |
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342 // borrow the same address. |
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343 if (DumpSharedSpaces) { |
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344 char* shared_base = (char*)HeapBaseMinAddress; |
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345 _rs = ReservedSpace(byte_size, 0, false, shared_base, 0); |
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346 if (_rs.is_reserved()) { |
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347 assert(_rs.base() == shared_base, "should match"); |
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348 } else { |
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349 // If we are dumping the heap, then allocate a wasted block of address |
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350 // space in order to push the heap to a lower address. This extra |
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351 // address range allows for other (or larger) libraries to be loaded |
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352 // without them occupying the space required for the shared spaces. |
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353 uintx reserved = 0; |
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354 uintx block_size = 64*1024*1024; |
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355 while (reserved < SharedDummyBlockSize) { |
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356 char* dummy = os::reserve_memory(block_size); |
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357 reserved += block_size; |
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358 } |
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359 _rs = ReservedSpace(byte_size); |
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360 } |
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361 MetaspaceShared::set_shared_rs(&_rs); |
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362 } else { |
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363 _rs = ReservedSpace(byte_size); |
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364 } |
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365 |
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366 MemTracker::record_virtual_memory_type((address)_rs.base(), mtClass); |
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367 } |
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368 |
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369 // List of VirtualSpaces for metadata allocation. |
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370 // It has a _next link for singly linked list and a MemRegion |
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371 // for total space in the VirtualSpace. |
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372 class VirtualSpaceList : public CHeapObj<mtClass> { |
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373 friend class VirtualSpaceNode; |
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374 |
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375 enum VirtualSpaceSizes { |
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376 VirtualSpaceSize = 256 * K |
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377 }; |
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378 |
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379 // Global list of virtual spaces |
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380 // Head of the list |
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381 VirtualSpaceNode* _virtual_space_list; |
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382 // virtual space currently being used for allocations |
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383 VirtualSpaceNode* _current_virtual_space; |
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384 // Free chunk list for all other metadata |
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385 ChunkManager _chunk_manager; |
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386 |
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387 // Can this virtual list allocate >1 spaces? Also, used to determine |
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388 // whether to allocate unlimited small chunks in this virtual space |
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389 bool _is_class; |
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390 bool can_grow() const { return !is_class() || !UseCompressedKlassPointers; } |
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391 |
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392 // Sum of space in all virtual spaces and number of virtual spaces |
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393 size_t _virtual_space_total; |
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394 size_t _virtual_space_count; |
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395 |
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396 ~VirtualSpaceList(); |
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397 |
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398 VirtualSpaceNode* virtual_space_list() const { return _virtual_space_list; } |
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399 |
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400 void set_virtual_space_list(VirtualSpaceNode* v) { |
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401 _virtual_space_list = v; |
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402 } |
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403 void set_current_virtual_space(VirtualSpaceNode* v) { |
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404 _current_virtual_space = v; |
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405 } |
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406 |
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407 void link_vs(VirtualSpaceNode* new_entry, size_t vs_word_size); |
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408 |
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409 // Get another virtual space and add it to the list. This |
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410 // is typically prompted by a failed attempt to allocate a chunk |
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411 // and is typically followed by the allocation of a chunk. |
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412 bool grow_vs(size_t vs_word_size); |
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413 |
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414 public: |
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415 VirtualSpaceList(size_t word_size); |
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416 VirtualSpaceList(ReservedSpace rs); |
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417 |
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418 Metachunk* get_new_chunk(size_t word_size, |
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419 size_t grow_chunks_by_words, |
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420 size_t medium_chunk_bunch); |
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421 |
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422 // Get the first chunk for a Metaspace. Used for |
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423 // special cases such as the boot class loader, reflection |
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424 // class loader and anonymous class loader. |
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425 Metachunk* get_initialization_chunk(size_t word_size, size_t chunk_bunch); |
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426 |
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427 VirtualSpaceNode* current_virtual_space() { |
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428 return _current_virtual_space; |
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429 } |
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430 |
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431 ChunkManager* chunk_manager() { return &_chunk_manager; } |
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432 bool is_class() const { return _is_class; } |
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433 |
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434 // Allocate the first virtualspace. |
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435 void initialize(size_t word_size); |
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436 |
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437 size_t virtual_space_total() { return _virtual_space_total; } |
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438 void inc_virtual_space_total(size_t v) { |
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439 Atomic::add_ptr(v, &_virtual_space_total); |
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440 } |
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441 |
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442 size_t virtual_space_count() { return _virtual_space_count; } |
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443 void inc_virtual_space_count() { |
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444 Atomic::inc_ptr(&_virtual_space_count); |
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445 } |
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446 |
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447 // Used and capacity in the entire list of virtual spaces. |
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448 // These are global values shared by all Metaspaces |
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449 size_t capacity_words_sum(); |
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450 size_t capacity_bytes_sum() { return capacity_words_sum() * BytesPerWord; } |
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451 size_t used_words_sum(); |
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452 size_t used_bytes_sum() { return used_words_sum() * BytesPerWord; } |
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453 |
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454 bool contains(const void *ptr); |
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455 |
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456 void print_on(outputStream* st) const; |
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457 |
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458 class VirtualSpaceListIterator : public StackObj { |
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459 VirtualSpaceNode* _virtual_spaces; |
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460 public: |
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461 VirtualSpaceListIterator(VirtualSpaceNode* virtual_spaces) : |
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462 _virtual_spaces(virtual_spaces) {} |
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463 |
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464 bool repeat() { |
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465 return _virtual_spaces != NULL; |
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466 } |
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467 |
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468 VirtualSpaceNode* get_next() { |
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469 VirtualSpaceNode* result = _virtual_spaces; |
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470 if (_virtual_spaces != NULL) { |
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471 _virtual_spaces = _virtual_spaces->next(); |
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472 } |
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473 return result; |
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474 } |
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475 }; |
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476 }; |
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477 |
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478 class Metadebug : AllStatic { |
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479 // Debugging support for Metaspaces |
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480 static int _deallocate_block_a_lot_count; |
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481 static int _deallocate_chunk_a_lot_count; |
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482 static int _allocation_fail_alot_count; |
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483 |
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484 public: |
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485 static int deallocate_block_a_lot_count() { |
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486 return _deallocate_block_a_lot_count; |
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487 } |
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488 static void set_deallocate_block_a_lot_count(int v) { |
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489 _deallocate_block_a_lot_count = v; |
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490 } |
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491 static void inc_deallocate_block_a_lot_count() { |
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492 _deallocate_block_a_lot_count++; |
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493 } |
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494 static int deallocate_chunk_a_lot_count() { |
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495 return _deallocate_chunk_a_lot_count; |
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496 } |
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497 static void reset_deallocate_chunk_a_lot_count() { |
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498 _deallocate_chunk_a_lot_count = 1; |
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499 } |
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500 static void inc_deallocate_chunk_a_lot_count() { |
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501 _deallocate_chunk_a_lot_count++; |
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502 } |
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503 |
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504 static void init_allocation_fail_alot_count(); |
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505 #ifdef ASSERT |
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506 static bool test_metadata_failure(); |
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507 #endif |
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508 |
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509 static void deallocate_chunk_a_lot(SpaceManager* sm, |
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510 size_t chunk_word_size); |
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511 static void deallocate_block_a_lot(SpaceManager* sm, |
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512 size_t chunk_word_size); |
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513 |
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514 }; |
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515 |
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516 int Metadebug::_deallocate_block_a_lot_count = 0; |
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517 int Metadebug::_deallocate_chunk_a_lot_count = 0; |
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518 int Metadebug::_allocation_fail_alot_count = 0; |
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519 |
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520 // SpaceManager - used by Metaspace to handle allocations |
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521 class SpaceManager : public CHeapObj<mtClass> { |
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522 friend class Metaspace; |
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523 friend class Metadebug; |
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524 |
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525 private: |
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526 |
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527 // protects allocations and contains. |
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528 Mutex* const _lock; |
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529 |
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530 // Chunk related size |
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531 size_t _medium_chunk_bunch; |
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532 |
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533 // List of chunks in use by this SpaceManager. Allocations |
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534 // are done from the current chunk. The list is used for deallocating |
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535 // chunks when the SpaceManager is freed. |
6885 | 536 Metachunk* _chunks_in_use[NumberOfInUseLists]; |
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537 Metachunk* _current_chunk; |
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538 |
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539 // Virtual space where allocation comes from. |
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540 VirtualSpaceList* _vs_list; |
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541 |
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542 // Number of small chunks to allocate to a manager |
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543 // If class space manager, small chunks are unlimited |
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544 static uint const _small_chunk_limit; |
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545 bool has_small_chunk_limit() { return !vs_list()->is_class(); } |
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546 |
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547 // Sum of all space in allocated chunks |
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548 size_t _allocation_total; |
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549 |
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550 // Free lists of blocks are per SpaceManager since they |
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551 // are assumed to be in chunks in use by the SpaceManager |
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552 // and all chunks in use by a SpaceManager are freed when |
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553 // the class loader using the SpaceManager is collected. |
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554 BlockFreelist _block_freelists; |
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555 |
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556 // protects virtualspace and chunk expansions |
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557 static const char* _expand_lock_name; |
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558 static const int _expand_lock_rank; |
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559 static Mutex* const _expand_lock; |
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560 |
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561 private: |
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562 // Accessors |
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563 Metachunk* chunks_in_use(ChunkIndex index) const { return _chunks_in_use[index]; } |
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564 void set_chunks_in_use(ChunkIndex index, Metachunk* v) { _chunks_in_use[index] = v; } |
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565 |
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566 BlockFreelist* block_freelists() const { |
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567 return (BlockFreelist*) &_block_freelists; |
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568 } |
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569 |
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570 VirtualSpaceList* vs_list() const { return _vs_list; } |
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571 |
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572 Metachunk* current_chunk() const { return _current_chunk; } |
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573 void set_current_chunk(Metachunk* v) { |
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574 _current_chunk = v; |
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575 } |
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576 |
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577 Metachunk* find_current_chunk(size_t word_size); |
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578 |
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579 // Add chunk to the list of chunks in use |
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580 void add_chunk(Metachunk* v, bool make_current); |
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581 |
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582 Mutex* lock() const { return _lock; } |
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583 |
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584 const char* chunk_size_name(ChunkIndex index) const; |
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585 |
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586 protected: |
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587 void initialize(); |
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588 |
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589 public: |
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590 SpaceManager(Mutex* lock, |
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591 VirtualSpaceList* vs_list); |
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592 ~SpaceManager(); |
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593 |
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594 enum ChunkMultiples { |
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595 MediumChunkMultiple = 4 |
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596 }; |
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597 |
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598 // Accessors |
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599 size_t specialized_chunk_size() { return SpecializedChunk; } |
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600 size_t small_chunk_size() { return (size_t) vs_list()->is_class() ? ClassSmallChunk : SmallChunk; } |
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601 size_t medium_chunk_size() { return (size_t) vs_list()->is_class() ? ClassMediumChunk : MediumChunk; } |
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602 size_t medium_chunk_bunch() { return medium_chunk_size() * MediumChunkMultiple; } |
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603 |
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604 size_t allocation_total() const { return _allocation_total; } |
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605 void inc_allocation_total(size_t v) { Atomic::add_ptr(v, &_allocation_total); } |
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606 bool is_humongous(size_t word_size) { return word_size > medium_chunk_size(); } |
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607 |
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608 static Mutex* expand_lock() { return _expand_lock; } |
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609 |
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610 // Set the sizes for the initial chunks. |
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611 void get_initial_chunk_sizes(Metaspace::MetaspaceType type, |
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612 size_t* chunk_word_size, |
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613 size_t* class_chunk_word_size); |
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614 |
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615 size_t sum_capacity_in_chunks_in_use() const; |
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616 size_t sum_used_in_chunks_in_use() const; |
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617 size_t sum_free_in_chunks_in_use() const; |
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618 size_t sum_waste_in_chunks_in_use() const; |
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619 size_t sum_waste_in_chunks_in_use(ChunkIndex index ) const; |
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620 |
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621 size_t sum_count_in_chunks_in_use(); |
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622 size_t sum_count_in_chunks_in_use(ChunkIndex i); |
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623 |
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624 Metachunk* get_new_chunk(size_t word_size, size_t grow_chunks_by_words); |
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625 |
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626 // Block allocation and deallocation. |
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627 // Allocates a block from the current chunk |
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628 MetaWord* allocate(size_t word_size); |
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629 |
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630 // Helper for allocations |
6885 | 631 MetaWord* allocate_work(size_t word_size); |
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632 |
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633 // Returns a block to the per manager freelist |
6885 | 634 void deallocate(MetaWord* p, size_t word_size); |
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635 |
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636 // Based on the allocation size and a minimum chunk size, |
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637 // returned chunk size (for expanding space for chunk allocation). |
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638 size_t calc_chunk_size(size_t allocation_word_size); |
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639 |
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640 // Called when an allocation from the current chunk fails. |
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641 // Gets a new chunk (may require getting a new virtual space), |
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642 // and allocates from that chunk. |
6885 | 643 MetaWord* grow_and_allocate(size_t word_size); |
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644 |
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645 // debugging support. |
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646 |
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647 void dump(outputStream* const out) const; |
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648 void print_on(outputStream* st) const; |
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649 void locked_print_chunks_in_use_on(outputStream* st) const; |
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650 |
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651 void verify(); |
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652 void verify_chunk_size(Metachunk* chunk); |
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653 NOT_PRODUCT(void mangle_freed_chunks();) |
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654 #ifdef ASSERT |
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655 void verify_allocation_total(); |
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656 #endif |
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657 }; |
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658 |
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659 uint const SpaceManager::_small_chunk_limit = 4; |
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660 |
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661 const char* SpaceManager::_expand_lock_name = |
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662 "SpaceManager chunk allocation lock"; |
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663 const int SpaceManager::_expand_lock_rank = Monitor::leaf - 1; |
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664 Mutex* const SpaceManager::_expand_lock = |
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665 new Mutex(SpaceManager::_expand_lock_rank, |
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666 SpaceManager::_expand_lock_name, |
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667 Mutex::_allow_vm_block_flag); |
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668 |
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669 // BlockFreelist methods |
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670 |
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671 BlockFreelist::BlockFreelist() : _dictionary(NULL) {} |
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672 |
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673 BlockFreelist::~BlockFreelist() { |
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674 if (_dictionary != NULL) { |
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675 if (Verbose && TraceMetadataChunkAllocation) { |
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676 _dictionary->print_free_lists(gclog_or_tty); |
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677 } |
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678 delete _dictionary; |
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679 } |
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680 } |
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681 |
6885 | 682 Metablock* BlockFreelist::initialize_free_chunk(MetaWord* p, size_t word_size) { |
683 Metablock* block = (Metablock*) p; | |
684 block->set_word_size(word_size); | |
685 block->set_prev(NULL); | |
686 block->set_next(NULL); | |
687 | |
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688 return block; |
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689 } |
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690 |
6885 | 691 void BlockFreelist::return_block(MetaWord* p, size_t word_size) { |
692 Metablock* free_chunk = initialize_free_chunk(p, word_size); | |
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693 if (dictionary() == NULL) { |
6885 | 694 _dictionary = new BlockTreeDictionary(); |
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695 } |
6885 | 696 dictionary()->return_chunk(free_chunk); |
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697 } |
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698 |
6885 | 699 MetaWord* BlockFreelist::get_block(size_t word_size) { |
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700 if (dictionary() == NULL) { |
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701 return NULL; |
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702 } |
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703 |
6885 | 704 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) { |
705 // Dark matter. Too small for dictionary. | |
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706 return NULL; |
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707 } |
6885 | 708 |
709 Metablock* free_block = | |
710 dictionary()->get_chunk(word_size, FreeBlockDictionary<Metablock>::exactly); | |
711 if (free_block == NULL) { | |
712 return NULL; | |
713 } | |
714 | |
715 return (MetaWord*) free_block; | |
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716 } |
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717 |
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718 void BlockFreelist::print_on(outputStream* st) const { |
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719 if (dictionary() == NULL) { |
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720 return; |
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721 } |
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722 dictionary()->print_free_lists(st); |
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723 } |
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724 |
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725 // VirtualSpaceNode methods |
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726 |
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727 VirtualSpaceNode::~VirtualSpaceNode() { |
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728 _rs.release(); |
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729 } |
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730 |
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731 size_t VirtualSpaceNode::used_words_in_vs() const { |
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732 return pointer_delta(top(), bottom(), sizeof(MetaWord)); |
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733 } |
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734 |
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735 // Space committed in the VirtualSpace |
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736 size_t VirtualSpaceNode::capacity_words_in_vs() const { |
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737 return pointer_delta(end(), bottom(), sizeof(MetaWord)); |
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738 } |
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739 |
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740 |
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741 // Allocates the chunk from the virtual space only. |
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742 // This interface is also used internally for debugging. Not all |
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743 // chunks removed here are necessarily used for allocation. |
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744 Metachunk* VirtualSpaceNode::take_from_committed(size_t chunk_word_size) { |
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745 // Bottom of the new chunk |
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746 MetaWord* chunk_limit = top(); |
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747 assert(chunk_limit != NULL, "Not safe to call this method"); |
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748 |
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749 if (!is_available(chunk_word_size)) { |
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750 if (TraceMetadataChunkAllocation) { |
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751 tty->print("VirtualSpaceNode::take_from_committed() not available %d words ", chunk_word_size); |
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752 // Dump some information about the virtual space that is nearly full |
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753 print_on(tty); |
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754 } |
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755 return NULL; |
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756 } |
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757 |
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758 // Take the space (bump top on the current virtual space). |
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759 inc_top(chunk_word_size); |
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760 |
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761 // Point the chunk at the space |
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762 Metachunk* result = Metachunk::initialize(chunk_limit, chunk_word_size); |
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763 return result; |
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764 } |
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765 |
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766 |
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767 // Expand the virtual space (commit more of the reserved space) |
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768 bool VirtualSpaceNode::expand_by(size_t words, bool pre_touch) { |
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769 size_t bytes = words * BytesPerWord; |
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770 bool result = virtual_space()->expand_by(bytes, pre_touch); |
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771 if (TraceMetavirtualspaceAllocation && !result) { |
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772 gclog_or_tty->print_cr("VirtualSpaceNode::expand_by() failed " |
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773 "for byte size " SIZE_FORMAT, bytes); |
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774 virtual_space()->print(); |
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775 } |
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776 return result; |
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777 } |
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778 |
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779 // Shrink the virtual space (commit more of the reserved space) |
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780 bool VirtualSpaceNode::shrink_by(size_t words) { |
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781 size_t bytes = words * BytesPerWord; |
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782 virtual_space()->shrink_by(bytes); |
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783 return true; |
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784 } |
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785 |
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786 // Add another chunk to the chunk list. |
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787 |
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788 Metachunk* VirtualSpaceNode::get_chunk_vs(size_t chunk_word_size) { |
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789 assert_lock_strong(SpaceManager::expand_lock()); |
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790 Metachunk* result = NULL; |
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791 |
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792 return take_from_committed(chunk_word_size); |
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793 } |
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794 |
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795 Metachunk* VirtualSpaceNode::get_chunk_vs_with_expand(size_t chunk_word_size) { |
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796 assert_lock_strong(SpaceManager::expand_lock()); |
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797 |
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798 Metachunk* new_chunk = get_chunk_vs(chunk_word_size); |
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799 |
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800 if (new_chunk == NULL) { |
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801 // Only a small part of the virtualspace is committed when first |
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802 // allocated so committing more here can be expected. |
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803 size_t page_size_words = os::vm_page_size() / BytesPerWord; |
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804 size_t aligned_expand_vs_by_words = align_size_up(chunk_word_size, |
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805 page_size_words); |
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806 expand_by(aligned_expand_vs_by_words, false); |
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807 new_chunk = get_chunk_vs(chunk_word_size); |
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808 } |
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809 return new_chunk; |
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810 } |
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811 |
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812 bool VirtualSpaceNode::initialize() { |
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813 |
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814 if (!_rs.is_reserved()) { |
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815 return false; |
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816 } |
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817 |
7446
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818 // An allocation out of this Virtualspace that is larger |
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819 // than an initial commit size can waste that initial committed |
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820 // space. |
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821 size_t committed_byte_size = 0; |
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822 bool result = virtual_space()->initialize(_rs, committed_byte_size); |
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823 if (result) { |
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824 set_top((MetaWord*)virtual_space()->low()); |
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825 set_reserved(MemRegion((HeapWord*)_rs.base(), |
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826 (HeapWord*)(_rs.base() + _rs.size()))); |
6726
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827 |
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828 assert(reserved()->start() == (HeapWord*) _rs.base(), |
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829 err_msg("Reserved start was not set properly " PTR_FORMAT |
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830 " != " PTR_FORMAT, reserved()->start(), _rs.base())); |
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831 assert(reserved()->word_size() == _rs.size() / BytesPerWord, |
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832 err_msg("Reserved size was not set properly " SIZE_FORMAT |
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833 " != " SIZE_FORMAT, reserved()->word_size(), |
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834 _rs.size() / BytesPerWord)); |
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835 } |
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836 |
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837 return result; |
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838 } |
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839 |
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840 void VirtualSpaceNode::print_on(outputStream* st) const { |
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841 size_t used = used_words_in_vs(); |
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842 size_t capacity = capacity_words_in_vs(); |
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843 VirtualSpace* vs = virtual_space(); |
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844 st->print_cr(" space @ " PTR_FORMAT " " SIZE_FORMAT "K, %3d%% used " |
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845 "[" PTR_FORMAT ", " PTR_FORMAT ", " |
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846 PTR_FORMAT ", " PTR_FORMAT ")", |
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847 vs, capacity / K, |
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848 capacity == 0 ? 0 : used * 100 / capacity, |
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849 bottom(), top(), end(), |
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850 vs->high_boundary()); |
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851 } |
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852 |
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853 #ifdef ASSERT |
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854 void VirtualSpaceNode::mangle() { |
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855 size_t word_size = capacity_words_in_vs(); |
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856 Copy::fill_to_words((HeapWord*) low(), word_size, 0xf1f1f1f1); |
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857 } |
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858 #endif // ASSERT |
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859 |
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860 // VirtualSpaceList methods |
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861 // Space allocated from the VirtualSpace |
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862 |
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863 VirtualSpaceList::~VirtualSpaceList() { |
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864 VirtualSpaceListIterator iter(virtual_space_list()); |
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865 while (iter.repeat()) { |
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866 VirtualSpaceNode* vsl = iter.get_next(); |
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867 delete vsl; |
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868 } |
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869 } |
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870 |
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871 size_t VirtualSpaceList::used_words_sum() { |
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872 size_t allocated_by_vs = 0; |
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873 VirtualSpaceListIterator iter(virtual_space_list()); |
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874 while (iter.repeat()) { |
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875 VirtualSpaceNode* vsl = iter.get_next(); |
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876 // Sum used region [bottom, top) in each virtualspace |
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877 allocated_by_vs += vsl->used_words_in_vs(); |
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878 } |
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879 assert(allocated_by_vs >= chunk_manager()->free_chunks_total(), |
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880 err_msg("Total in free chunks " SIZE_FORMAT |
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881 " greater than total from virtual_spaces " SIZE_FORMAT, |
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882 allocated_by_vs, chunk_manager()->free_chunks_total())); |
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883 size_t used = |
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884 allocated_by_vs - chunk_manager()->free_chunks_total(); |
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885 return used; |
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886 } |
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887 |
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888 // Space available in all MetadataVirtualspaces allocated |
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889 // for metadata. This is the upper limit on the capacity |
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890 // of chunks allocated out of all the MetadataVirtualspaces. |
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891 size_t VirtualSpaceList::capacity_words_sum() { |
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892 size_t capacity = 0; |
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893 VirtualSpaceListIterator iter(virtual_space_list()); |
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894 while (iter.repeat()) { |
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895 VirtualSpaceNode* vsl = iter.get_next(); |
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896 capacity += vsl->capacity_words_in_vs(); |
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897 } |
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898 return capacity; |
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|
899 } |
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900 |
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901 VirtualSpaceList::VirtualSpaceList(size_t word_size ) : |
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902 _is_class(false), |
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903 _virtual_space_list(NULL), |
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904 _current_virtual_space(NULL), |
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905 _virtual_space_total(0), |
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906 _virtual_space_count(0) { |
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907 MutexLockerEx cl(SpaceManager::expand_lock(), |
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908 Mutex::_no_safepoint_check_flag); |
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909 bool initialization_succeeded = grow_vs(word_size); |
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910 |
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911 assert(initialization_succeeded, |
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912 " VirtualSpaceList initialization should not fail"); |
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913 } |
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|
914 |
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915 VirtualSpaceList::VirtualSpaceList(ReservedSpace rs) : |
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916 _is_class(true), |
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917 _virtual_space_list(NULL), |
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918 _current_virtual_space(NULL), |
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|
919 _virtual_space_total(0), |
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920 _virtual_space_count(0) { |
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921 MutexLockerEx cl(SpaceManager::expand_lock(), |
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922 Mutex::_no_safepoint_check_flag); |
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923 VirtualSpaceNode* class_entry = new VirtualSpaceNode(rs); |
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924 bool succeeded = class_entry->initialize(); |
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925 assert(succeeded, " VirtualSpaceList initialization should not fail"); |
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926 link_vs(class_entry, rs.size()/BytesPerWord); |
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|
927 } |
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|
928 |
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929 // Allocate another meta virtual space and add it to the list. |
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930 bool VirtualSpaceList::grow_vs(size_t vs_word_size) { |
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931 assert_lock_strong(SpaceManager::expand_lock()); |
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932 if (vs_word_size == 0) { |
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|
933 return false; |
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|
934 } |
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935 // Reserve the space |
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936 size_t vs_byte_size = vs_word_size * BytesPerWord; |
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937 assert(vs_byte_size % os::vm_page_size() == 0, "Not aligned"); |
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|
938 |
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939 // Allocate the meta virtual space and initialize it. |
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940 VirtualSpaceNode* new_entry = new VirtualSpaceNode(vs_byte_size); |
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941 if (!new_entry->initialize()) { |
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942 delete new_entry; |
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943 return false; |
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|
944 } else { |
7176
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945 // ensure lock-free iteration sees fully initialized node |
59c790074993
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|
946 OrderAccess::storestore(); |
6725
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947 link_vs(new_entry, vs_word_size); |
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948 return true; |
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|
949 } |
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950 } |
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|
951 |
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952 void VirtualSpaceList::link_vs(VirtualSpaceNode* new_entry, size_t vs_word_size) { |
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953 if (virtual_space_list() == NULL) { |
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954 set_virtual_space_list(new_entry); |
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955 } else { |
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956 current_virtual_space()->set_next(new_entry); |
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|
957 } |
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958 set_current_virtual_space(new_entry); |
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959 inc_virtual_space_total(vs_word_size); |
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960 inc_virtual_space_count(); |
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961 #ifdef ASSERT |
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962 new_entry->mangle(); |
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963 #endif |
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964 if (TraceMetavirtualspaceAllocation && Verbose) { |
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965 VirtualSpaceNode* vsl = current_virtual_space(); |
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|
966 vsl->print_on(tty); |
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|
967 } |
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|
968 } |
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969 |
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970 Metachunk* VirtualSpaceList::get_new_chunk(size_t word_size, |
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971 size_t grow_chunks_by_words, |
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972 size_t medium_chunk_bunch) { |
6725
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|
973 |
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974 // Get a chunk from the chunk freelist |
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975 Metachunk* next = chunk_manager()->chunk_freelist_allocate(grow_chunks_by_words); |
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976 |
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977 // Allocate a chunk out of the current virtual space. |
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978 if (next == NULL) { |
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979 next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words); |
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980 } |
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981 |
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982 if (next == NULL) { |
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983 // Not enough room in current virtual space. Try to commit |
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984 // more space. |
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985 size_t expand_vs_by_words = MAX2(medium_chunk_bunch, |
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986 grow_chunks_by_words); |
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987 size_t page_size_words = os::vm_page_size() / BytesPerWord; |
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988 size_t aligned_expand_vs_by_words = align_size_up(expand_vs_by_words, |
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989 page_size_words); |
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990 bool vs_expanded = |
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991 current_virtual_space()->expand_by(aligned_expand_vs_by_words, false); |
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992 if (!vs_expanded) { |
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993 // Should the capacity of the metaspaces be expanded for |
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994 // this allocation? If it's the virtual space for classes and is |
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995 // being used for CompressedHeaders, don't allocate a new virtualspace. |
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996 if (can_grow() && MetaspaceGC::should_expand(this, word_size)) { |
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997 // Get another virtual space. |
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998 size_t grow_vs_words = |
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999 MAX2((size_t)VirtualSpaceSize, aligned_expand_vs_by_words); |
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1000 if (grow_vs(grow_vs_words)) { |
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1001 // Got it. It's on the list now. Get a chunk from it. |
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1002 next = current_virtual_space()->get_chunk_vs_with_expand(grow_chunks_by_words); |
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1003 } |
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1004 } else { |
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1005 // Allocation will fail and induce a GC |
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1006 if (TraceMetadataChunkAllocation && Verbose) { |
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1007 gclog_or_tty->print_cr("VirtualSpaceList::get_new_chunk():" |
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1008 " Fail instead of expand the metaspace"); |
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1009 } |
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1010 } |
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1011 } else { |
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1012 // The virtual space expanded, get a new chunk |
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1013 next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words); |
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1014 assert(next != NULL, "Just expanded, should succeed"); |
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1015 } |
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1016 } |
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1017 |
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1018 assert(next == NULL || (next->next() == NULL && next->prev() == NULL), |
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1019 "New chunk is still on some list"); |
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1020 return next; |
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1021 } |
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1022 |
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1023 Metachunk* VirtualSpaceList::get_initialization_chunk(size_t chunk_word_size, |
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1024 size_t chunk_bunch) { |
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1025 // Get a chunk from the chunk freelist |
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1026 Metachunk* new_chunk = get_new_chunk(chunk_word_size, |
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1027 chunk_word_size, |
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1028 chunk_bunch); |
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1029 return new_chunk; |
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1030 } |
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1031 |
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1032 void VirtualSpaceList::print_on(outputStream* st) const { |
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1033 if (TraceMetadataChunkAllocation && Verbose) { |
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1034 VirtualSpaceListIterator iter(virtual_space_list()); |
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1035 while (iter.repeat()) { |
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1036 VirtualSpaceNode* node = iter.get_next(); |
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1037 node->print_on(st); |
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1038 } |
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1039 } |
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1040 } |
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1041 |
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1042 bool VirtualSpaceList::contains(const void *ptr) { |
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1043 VirtualSpaceNode* list = virtual_space_list(); |
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1044 VirtualSpaceListIterator iter(list); |
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1045 while (iter.repeat()) { |
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1046 VirtualSpaceNode* node = iter.get_next(); |
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1047 if (node->reserved()->contains(ptr)) { |
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1048 return true; |
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1049 } |
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1050 } |
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1051 return false; |
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1052 } |
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1053 |
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1054 |
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1055 // MetaspaceGC methods |
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1056 |
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1057 // VM_CollectForMetadataAllocation is the vm operation used to GC. |
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1058 // Within the VM operation after the GC the attempt to allocate the metadata |
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1059 // should succeed. If the GC did not free enough space for the metaspace |
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1060 // allocation, the HWM is increased so that another virtualspace will be |
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1061 // allocated for the metadata. With perm gen the increase in the perm |
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1062 // gen had bounds, MinMetaspaceExpansion and MaxMetaspaceExpansion. The |
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1063 // metaspace policy uses those as the small and large steps for the HWM. |
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1064 // |
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1065 // After the GC the compute_new_size() for MetaspaceGC is called to |
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1066 // resize the capacity of the metaspaces. The current implementation |
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1067 // is based on the flags MinMetaspaceFreeRatio and MaxHeapFreeRatio used |
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1068 // to resize the Java heap by some GC's. New flags can be implemented |
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1069 // if really needed. MinHeapFreeRatio is used to calculate how much |
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1070 // free space is desirable in the metaspace capacity to decide how much |
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1071 // to increase the HWM. MaxMetaspaceFreeRatio is used to decide how much |
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1072 // free space is desirable in the metaspace capacity before decreasing |
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1073 // the HWM. |
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1074 |
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1075 // Calculate the amount to increase the high water mark (HWM). |
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1076 // Increase by a minimum amount (MinMetaspaceExpansion) so that |
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1077 // another expansion is not requested too soon. If that is not |
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1078 // enough to satisfy the allocation (i.e. big enough for a word_size |
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1079 // allocation), increase by MaxMetaspaceExpansion. If that is still |
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1080 // not enough, expand by the size of the allocation (word_size) plus |
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1081 // some. |
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1082 size_t MetaspaceGC::delta_capacity_until_GC(size_t word_size) { |
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1083 size_t before_inc = MetaspaceGC::capacity_until_GC(); |
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1084 size_t min_delta_words = MinMetaspaceExpansion / BytesPerWord; |
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1085 size_t max_delta_words = MaxMetaspaceExpansion / BytesPerWord; |
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1086 size_t page_size_words = os::vm_page_size() / BytesPerWord; |
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1087 size_t size_delta_words = align_size_up(word_size, page_size_words); |
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1088 size_t delta_words = MAX2(size_delta_words, min_delta_words); |
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1089 if (delta_words > min_delta_words) { |
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1090 // Don't want to hit the high water mark on the next |
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1091 // allocation so make the delta greater than just enough |
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1092 // for this allocation. |
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1093 delta_words = MAX2(delta_words, max_delta_words); |
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1094 if (delta_words > max_delta_words) { |
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1095 // This allocation is large but the next ones are probably not |
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1096 // so increase by the minimum. |
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1097 delta_words = delta_words + min_delta_words; |
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1098 } |
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1099 } |
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1100 return delta_words; |
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1101 } |
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1102 |
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1103 bool MetaspaceGC::should_expand(VirtualSpaceList* vsl, size_t word_size) { |
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1104 |
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1105 // Class virtual space should always be expanded. Call GC for the other |
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1106 // metadata virtual space. |
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1107 if (vsl == Metaspace::class_space_list()) return true; |
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1108 |
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1109 // If the user wants a limit, impose one. |
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1110 size_t max_metaspace_size_words = MaxMetaspaceSize / BytesPerWord; |
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1111 size_t metaspace_size_words = MetaspaceSize / BytesPerWord; |
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1112 if (!FLAG_IS_DEFAULT(MaxMetaspaceSize) && |
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1113 vsl->capacity_words_sum() >= max_metaspace_size_words) { |
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1114 return false; |
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1115 } |
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1116 |
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1117 // If this is part of an allocation after a GC, expand |
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1118 // unconditionally. |
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1119 if(MetaspaceGC::expand_after_GC()) { |
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1120 return true; |
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1121 } |
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1122 |
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1123 // If the capacity is below the minimum capacity, allow the |
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1124 // expansion. Also set the high-water-mark (capacity_until_GC) |
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1125 // to that minimum capacity so that a GC will not be induced |
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1126 // until that minimum capacity is exceeded. |
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1127 if (vsl->capacity_words_sum() < metaspace_size_words || |
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1128 capacity_until_GC() == 0) { |
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1129 set_capacity_until_GC(metaspace_size_words); |
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1130 return true; |
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1131 } else { |
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1132 if (vsl->capacity_words_sum() < capacity_until_GC()) { |
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1133 return true; |
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1134 } else { |
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1135 if (TraceMetadataChunkAllocation && Verbose) { |
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1136 gclog_or_tty->print_cr(" allocation request size " SIZE_FORMAT |
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1137 " capacity_until_GC " SIZE_FORMAT |
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1138 " capacity_words_sum " SIZE_FORMAT |
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1139 " used_words_sum " SIZE_FORMAT |
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1140 " free chunks " SIZE_FORMAT |
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1141 " free chunks count %d", |
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1142 word_size, |
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1143 capacity_until_GC(), |
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1144 vsl->capacity_words_sum(), |
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1145 vsl->used_words_sum(), |
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1146 vsl->chunk_manager()->free_chunks_total(), |
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1147 vsl->chunk_manager()->free_chunks_count()); |
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1148 } |
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1149 return false; |
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1150 } |
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1151 } |
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1152 } |
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1153 |
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1154 // Variables are in bytes |
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1155 |
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1156 void MetaspaceGC::compute_new_size() { |
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1157 assert(_shrink_factor <= 100, "invalid shrink factor"); |
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1158 uint current_shrink_factor = _shrink_factor; |
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1159 _shrink_factor = 0; |
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1160 |
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1161 VirtualSpaceList *vsl = Metaspace::space_list(); |
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1162 |
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1163 size_t capacity_after_gc = vsl->capacity_bytes_sum(); |
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1164 // Check to see if these two can be calculated without walking the CLDG |
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1165 size_t used_after_gc = vsl->used_bytes_sum(); |
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1166 size_t capacity_until_GC = vsl->capacity_bytes_sum(); |
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1167 size_t free_after_gc = capacity_until_GC - used_after_gc; |
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1168 |
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1169 const double minimum_free_percentage = MinMetaspaceFreeRatio / 100.0; |
6725
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1170 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
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1171 |
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1172 const double min_tmp = used_after_gc / maximum_used_percentage; |
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1173 size_t minimum_desired_capacity = |
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1174 (size_t)MIN2(min_tmp, double(max_uintx)); |
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1175 // Don't shrink less than the initial generation size |
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1176 minimum_desired_capacity = MAX2(minimum_desired_capacity, |
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1177 MetaspaceSize); |
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1178 |
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1179 if (PrintGCDetails && Verbose) { |
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1180 const double free_percentage = ((double)free_after_gc) / capacity_until_GC; |
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1181 gclog_or_tty->print_cr("\nMetaspaceGC::compute_new_size: "); |
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1182 gclog_or_tty->print_cr(" " |
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1183 " minimum_free_percentage: %6.2f" |
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1184 " maximum_used_percentage: %6.2f", |
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1185 minimum_free_percentage, |
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1186 maximum_used_percentage); |
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1187 double d_free_after_gc = free_after_gc / (double) K; |
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1188 gclog_or_tty->print_cr(" " |
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1189 " free_after_gc : %6.1fK" |
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1190 " used_after_gc : %6.1fK" |
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1191 " capacity_after_gc : %6.1fK" |
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1192 " metaspace HWM : %6.1fK", |
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1193 free_after_gc / (double) K, |
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1194 used_after_gc / (double) K, |
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1195 capacity_after_gc / (double) K, |
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1196 capacity_until_GC / (double) K); |
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1197 gclog_or_tty->print_cr(" " |
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1198 " free_percentage: %6.2f", |
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1199 free_percentage); |
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1200 } |
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1201 |
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1202 |
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1203 if (capacity_until_GC < minimum_desired_capacity) { |
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1204 // If we have less capacity below the metaspace HWM, then |
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1205 // increment the HWM. |
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1206 size_t expand_bytes = minimum_desired_capacity - capacity_until_GC; |
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1207 // Don't expand unless it's significant |
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1208 if (expand_bytes >= MinMetaspaceExpansion) { |
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1209 size_t expand_words = expand_bytes / BytesPerWord; |
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1210 MetaspaceGC::inc_capacity_until_GC(expand_words); |
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1211 } |
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1212 if (PrintGCDetails && Verbose) { |
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1213 size_t new_capacity_until_GC = MetaspaceGC::capacity_until_GC_in_bytes(); |
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1214 gclog_or_tty->print_cr(" expanding:" |
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1215 " minimum_desired_capacity: %6.1fK" |
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1216 " expand_words: %6.1fK" |
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1217 " MinMetaspaceExpansion: %6.1fK" |
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1218 " new metaspace HWM: %6.1fK", |
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1219 minimum_desired_capacity / (double) K, |
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1220 expand_bytes / (double) K, |
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1221 MinMetaspaceExpansion / (double) K, |
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1222 new_capacity_until_GC / (double) K); |
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1223 } |
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1224 return; |
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1225 } |
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1226 |
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1227 // No expansion, now see if we want to shrink |
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1228 size_t shrink_words = 0; |
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1229 // We would never want to shrink more than this |
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1230 size_t max_shrink_words = capacity_until_GC - minimum_desired_capacity; |
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1231 assert(max_shrink_words >= 0, err_msg("max_shrink_words " SIZE_FORMAT, |
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1232 max_shrink_words)); |
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1233 |
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1234 // Should shrinking be considered? |
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1235 if (MaxMetaspaceFreeRatio < 100) { |
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1236 const double maximum_free_percentage = MaxMetaspaceFreeRatio / 100.0; |
6725
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1237 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
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1238 const double max_tmp = used_after_gc / minimum_used_percentage; |
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1239 size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(max_uintx)); |
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1240 maximum_desired_capacity = MAX2(maximum_desired_capacity, |
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1241 MetaspaceSize); |
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1242 if (PrintGC && Verbose) { |
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1243 gclog_or_tty->print_cr(" " |
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1244 " maximum_free_percentage: %6.2f" |
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1245 " minimum_used_percentage: %6.2f", |
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1246 maximum_free_percentage, |
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1247 minimum_used_percentage); |
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1248 gclog_or_tty->print_cr(" " |
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1249 " capacity_until_GC: %6.1fK" |
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1250 " minimum_desired_capacity: %6.1fK" |
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1251 " maximum_desired_capacity: %6.1fK", |
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1252 capacity_until_GC / (double) K, |
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1253 minimum_desired_capacity / (double) K, |
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1254 maximum_desired_capacity / (double) K); |
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1255 } |
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1256 |
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1257 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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1258 "sanity check"); |
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1259 |
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1260 if (capacity_until_GC > maximum_desired_capacity) { |
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1261 // Capacity too large, compute shrinking size |
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1262 shrink_words = capacity_until_GC - maximum_desired_capacity; |
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1263 // We don't want shrink all the way back to initSize if people call |
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1264 // System.gc(), because some programs do that between "phases" and then |
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1265 // we'd just have to grow the heap up again for the next phase. So we |
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1266 // damp the shrinking: 0% on the first call, 10% on the second call, 40% |
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1267 // on the third call, and 100% by the fourth call. But if we recompute |
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1268 // size without shrinking, it goes back to 0%. |
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1269 shrink_words = shrink_words / 100 * current_shrink_factor; |
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1270 assert(shrink_words <= max_shrink_words, |
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1271 err_msg("invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT, |
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1272 shrink_words, max_shrink_words)); |
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1273 if (current_shrink_factor == 0) { |
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1274 _shrink_factor = 10; |
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1275 } else { |
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1276 _shrink_factor = MIN2(current_shrink_factor * 4, (uint) 100); |
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1277 } |
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1278 if (PrintGCDetails && Verbose) { |
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1279 gclog_or_tty->print_cr(" " |
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1280 " shrinking:" |
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1281 " initSize: %.1fK" |
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1282 " maximum_desired_capacity: %.1fK", |
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1283 MetaspaceSize / (double) K, |
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1284 maximum_desired_capacity / (double) K); |
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1285 gclog_or_tty->print_cr(" " |
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1286 " shrink_words: %.1fK" |
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1287 " current_shrink_factor: %d" |
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1288 " new shrink factor: %d" |
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1289 " MinMetaspaceExpansion: %.1fK", |
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1290 shrink_words / (double) K, |
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1291 current_shrink_factor, |
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1292 _shrink_factor, |
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1293 MinMetaspaceExpansion / (double) K); |
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|
1294 } |
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|
1295 } |
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1296 } |
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1297 |
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1298 |
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1299 // Don't shrink unless it's significant |
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1300 if (shrink_words >= MinMetaspaceExpansion) { |
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1301 VirtualSpaceNode* csp = vsl->current_virtual_space(); |
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1302 size_t available_to_shrink = csp->capacity_words_in_vs() - |
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1303 csp->used_words_in_vs(); |
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1304 shrink_words = MIN2(shrink_words, available_to_shrink); |
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1305 csp->shrink_by(shrink_words); |
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1306 MetaspaceGC::dec_capacity_until_GC(shrink_words); |
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1307 if (PrintGCDetails && Verbose) { |
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1308 size_t new_capacity_until_GC = MetaspaceGC::capacity_until_GC_in_bytes(); |
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1309 gclog_or_tty->print_cr(" metaspace HWM: %.1fK", new_capacity_until_GC / (double) K); |
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1310 } |
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1311 } |
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1312 assert(vsl->used_bytes_sum() == used_after_gc && |
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1313 used_after_gc <= vsl->capacity_bytes_sum(), |
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1314 "sanity check"); |
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1315 |
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1316 } |
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1317 |
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1318 // Metadebug methods |
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1319 |
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1320 void Metadebug::deallocate_chunk_a_lot(SpaceManager* sm, |
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1321 size_t chunk_word_size){ |
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1322 #ifdef ASSERT |
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1323 VirtualSpaceList* vsl = sm->vs_list(); |
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1324 if (MetaDataDeallocateALot && |
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1325 Metadebug::deallocate_chunk_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) { |
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1326 Metadebug::reset_deallocate_chunk_a_lot_count(); |
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1327 for (uint i = 0; i < metadata_deallocate_a_lock_chunk; i++) { |
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1328 Metachunk* dummy_chunk = vsl->current_virtual_space()->take_from_committed(chunk_word_size); |
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1329 if (dummy_chunk == NULL) { |
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1330 break; |
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1331 } |
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1332 vsl->chunk_manager()->chunk_freelist_deallocate(dummy_chunk); |
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1333 |
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1334 if (TraceMetadataChunkAllocation && Verbose) { |
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1335 gclog_or_tty->print("Metadebug::deallocate_chunk_a_lot: %d) ", |
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1336 sm->sum_count_in_chunks_in_use()); |
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1337 dummy_chunk->print_on(gclog_or_tty); |
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1338 gclog_or_tty->print_cr(" Free chunks total %d count %d", |
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1339 vsl->chunk_manager()->free_chunks_total(), |
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1340 vsl->chunk_manager()->free_chunks_count()); |
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1341 } |
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1342 } |
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1343 } else { |
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1344 Metadebug::inc_deallocate_chunk_a_lot_count(); |
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1345 } |
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1346 #endif |
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1347 } |
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1348 |
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1349 void Metadebug::deallocate_block_a_lot(SpaceManager* sm, |
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1350 size_t raw_word_size){ |
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1351 #ifdef ASSERT |
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1352 if (MetaDataDeallocateALot && |
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1353 Metadebug::deallocate_block_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) { |
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1354 Metadebug::set_deallocate_block_a_lot_count(0); |
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1355 for (uint i = 0; i < metadata_deallocate_a_lot_block; i++) { |
6885 | 1356 MetaWord* dummy_block = sm->allocate_work(raw_word_size); |
6725
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1357 if (dummy_block == 0) { |
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1358 break; |
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1359 } |
6885 | 1360 sm->deallocate(dummy_block, raw_word_size); |
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1361 } |
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1362 } else { |
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1363 Metadebug::inc_deallocate_block_a_lot_count(); |
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1364 } |
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1365 #endif |
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1366 } |
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1367 |
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1368 void Metadebug::init_allocation_fail_alot_count() { |
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1369 if (MetadataAllocationFailALot) { |
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1370 _allocation_fail_alot_count = |
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1371 1+(long)((double)MetadataAllocationFailALotInterval*os::random()/(max_jint+1.0)); |
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1372 } |
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1373 } |
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1374 |
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1375 #ifdef ASSERT |
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1376 bool Metadebug::test_metadata_failure() { |
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1377 if (MetadataAllocationFailALot && |
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1378 Threads::is_vm_complete()) { |
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1379 if (_allocation_fail_alot_count > 0) { |
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1380 _allocation_fail_alot_count--; |
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1381 } else { |
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1382 if (TraceMetadataChunkAllocation && Verbose) { |
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1383 gclog_or_tty->print_cr("Metadata allocation failing for " |
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1384 "MetadataAllocationFailALot"); |
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1385 } |
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1386 init_allocation_fail_alot_count(); |
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1387 return true; |
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1388 } |
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1389 } |
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1390 return false; |
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1391 } |
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1392 #endif |
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1393 |
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1394 // ChunkList methods |
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1395 |
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1396 size_t ChunkList::sum_list_size() { |
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1397 size_t result = 0; |
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1398 Metachunk* cur = head(); |
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1399 while (cur != NULL) { |
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1400 result += cur->word_size(); |
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1401 cur = cur->next(); |
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1402 } |
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1403 return result; |
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1404 } |
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1405 |
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1406 size_t ChunkList::sum_list_count() { |
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1407 size_t result = 0; |
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1408 Metachunk* cur = head(); |
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1409 while (cur != NULL) { |
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1410 result++; |
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1411 cur = cur->next(); |
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1412 } |
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1413 return result; |
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1414 } |
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1415 |
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1416 size_t ChunkList::sum_list_capacity() { |
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1417 size_t result = 0; |
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1418 Metachunk* cur = head(); |
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1419 while (cur != NULL) { |
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1420 result += cur->capacity_word_size(); |
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1421 cur = cur->next(); |
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1422 } |
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1423 return result; |
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1424 } |
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1425 |
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1426 void ChunkList::add_at_head(Metachunk* head, Metachunk* tail) { |
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1427 assert_lock_strong(SpaceManager::expand_lock()); |
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1428 assert(head == tail || tail->next() == NULL, |
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1429 "Not the tail or the head has already been added to a list"); |
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1430 |
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1431 if (TraceMetadataChunkAllocation && Verbose) { |
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1432 gclog_or_tty->print("ChunkList::add_at_head(head, tail): "); |
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1433 Metachunk* cur = head; |
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1434 while (cur != NULL) { |
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1435 gclog_or_tty->print(PTR_FORMAT " (" SIZE_FORMAT ") ", cur, cur->word_size()); |
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1436 cur = cur->next(); |
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1437 } |
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1438 gclog_or_tty->print_cr(""); |
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1439 } |
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1440 |
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1441 if (tail != NULL) { |
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1442 tail->set_next(_head); |
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1443 } |
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1444 set_head(head); |
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1445 } |
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1446 |
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1447 void ChunkList::add_at_head(Metachunk* list) { |
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1448 if (list == NULL) { |
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1449 // Nothing to add |
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1450 return; |
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1451 } |
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1452 assert_lock_strong(SpaceManager::expand_lock()); |
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1453 Metachunk* head = list; |
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1454 Metachunk* tail = list; |
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1455 Metachunk* cur = head->next(); |
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1456 // Search for the tail since it is not passed. |
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1457 while (cur != NULL) { |
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1458 tail = cur; |
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1459 cur = cur->next(); |
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1460 } |
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1461 add_at_head(head, tail); |
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1462 } |
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1463 |
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1464 // ChunkManager methods |
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1465 |
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1466 // Verification of _free_chunks_total and _free_chunks_count does not |
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1467 // work with the CMS collector because its use of additional locks |
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1468 // complicate the mutex deadlock detection but it can still be useful |
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1469 // for detecting errors in the chunk accounting with other collectors. |
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1470 |
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1471 size_t ChunkManager::free_chunks_total() { |
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1472 #ifdef ASSERT |
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1473 if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) { |
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1474 MutexLockerEx cl(SpaceManager::expand_lock(), |
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1475 Mutex::_no_safepoint_check_flag); |
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1476 slow_locked_verify_free_chunks_total(); |
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1477 } |
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1478 #endif |
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1479 return _free_chunks_total; |
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1480 } |
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1481 |
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1482 size_t ChunkManager::free_chunks_total_in_bytes() { |
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1483 return free_chunks_total() * BytesPerWord; |
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1484 } |
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1485 |
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1486 size_t ChunkManager::free_chunks_count() { |
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1487 #ifdef ASSERT |
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1488 if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) { |
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1489 MutexLockerEx cl(SpaceManager::expand_lock(), |
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1490 Mutex::_no_safepoint_check_flag); |
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1491 // This lock is only needed in debug because the verification |
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1492 // of the _free_chunks_totals walks the list of free chunks |
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1493 slow_locked_verify_free_chunks_count(); |
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1494 } |
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1495 #endif |
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1496 return _free_chunks_count; |
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1497 } |
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1498 |
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1499 void ChunkManager::locked_verify_free_chunks_total() { |
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1500 assert_lock_strong(SpaceManager::expand_lock()); |
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1501 assert(sum_free_chunks() == _free_chunks_total, |
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1502 err_msg("_free_chunks_total " SIZE_FORMAT " is not the" |
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1503 " same as sum " SIZE_FORMAT, _free_chunks_total, |
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1504 sum_free_chunks())); |
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1505 } |
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1506 |
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1507 void ChunkManager::verify_free_chunks_total() { |
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1508 MutexLockerEx cl(SpaceManager::expand_lock(), |
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1509 Mutex::_no_safepoint_check_flag); |
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1510 locked_verify_free_chunks_total(); |
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1511 } |
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1512 |
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1513 void ChunkManager::locked_verify_free_chunks_count() { |
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1514 assert_lock_strong(SpaceManager::expand_lock()); |
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1515 assert(sum_free_chunks_count() == _free_chunks_count, |
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1516 err_msg("_free_chunks_count " SIZE_FORMAT " is not the" |
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1517 " same as sum " SIZE_FORMAT, _free_chunks_count, |
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1518 sum_free_chunks_count())); |
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1519 } |
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1520 |
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1521 void ChunkManager::verify_free_chunks_count() { |
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1522 #ifdef ASSERT |
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1523 MutexLockerEx cl(SpaceManager::expand_lock(), |
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1524 Mutex::_no_safepoint_check_flag); |
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1525 locked_verify_free_chunks_count(); |
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1526 #endif |
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1527 } |
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1528 |
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1529 void ChunkManager::verify() { |
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1530 MutexLockerEx cl(SpaceManager::expand_lock(), |
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1531 Mutex::_no_safepoint_check_flag); |
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1532 locked_verify(); |
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1533 } |
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1534 |
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1535 void ChunkManager::locked_verify() { |
6885 | 1536 locked_verify_free_chunks_count(); |
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1537 locked_verify_free_chunks_total(); |
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1538 } |
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1539 |
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1540 void ChunkManager::locked_print_free_chunks(outputStream* st) { |
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1541 assert_lock_strong(SpaceManager::expand_lock()); |
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1542 st->print_cr("Free chunk total " SIZE_FORMAT " count " SIZE_FORMAT, |
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1543 _free_chunks_total, _free_chunks_count); |
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1544 } |
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1545 |
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1546 void ChunkManager::locked_print_sum_free_chunks(outputStream* st) { |
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1547 assert_lock_strong(SpaceManager::expand_lock()); |
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1548 st->print_cr("Sum free chunk total " SIZE_FORMAT " count " SIZE_FORMAT, |
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1549 sum_free_chunks(), sum_free_chunks_count()); |
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1550 } |
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1551 ChunkList* ChunkManager::free_chunks(ChunkIndex index) { |
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1552 return &_free_chunks[index]; |
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1553 } |
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1554 |
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1555 // These methods that sum the free chunk lists are used in printing |
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1556 // methods that are used in product builds. |
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1557 size_t ChunkManager::sum_free_chunks() { |
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1558 assert_lock_strong(SpaceManager::expand_lock()); |
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1559 size_t result = 0; |
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1560 for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) { |
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1561 ChunkList* list = free_chunks(i); |
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1562 |
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1563 if (list == NULL) { |
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1564 continue; |
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1565 } |
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1566 |
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1567 result = result + list->sum_list_capacity(); |
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1568 } |
6885 | 1569 result = result + humongous_dictionary()->total_size(); |
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1570 return result; |
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1571 } |
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1572 |
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1573 size_t ChunkManager::sum_free_chunks_count() { |
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1574 assert_lock_strong(SpaceManager::expand_lock()); |
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1575 size_t count = 0; |
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1576 for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) { |
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1577 ChunkList* list = free_chunks(i); |
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1578 if (list == NULL) { |
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1579 continue; |
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1580 } |
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1581 count = count + list->sum_list_count(); |
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1582 } |
6885 | 1583 count = count + humongous_dictionary()->total_free_blocks(); |
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1584 return count; |
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1585 } |
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1586 |
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1587 ChunkList* ChunkManager::find_free_chunks_list(size_t word_size) { |
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1588 ChunkIndex index = list_index(word_size); |
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1589 assert(index < HumongousIndex, "No humongous list"); |
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1590 return free_chunks(index); |
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1591 } |
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1592 |
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1593 void ChunkManager::free_chunks_put(Metachunk* chunk) { |
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1594 assert_lock_strong(SpaceManager::expand_lock()); |
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1595 ChunkList* free_list = find_free_chunks_list(chunk->word_size()); |
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1596 chunk->set_next(free_list->head()); |
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1597 free_list->set_head(chunk); |
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1598 // chunk is being returned to the chunk free list |
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1599 inc_free_chunks_total(chunk->capacity_word_size()); |
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1600 slow_locked_verify(); |
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1601 } |
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1602 |
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1603 void ChunkManager::chunk_freelist_deallocate(Metachunk* chunk) { |
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1604 // The deallocation of a chunk originates in the freelist |
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1605 // manangement code for a Metaspace and does not hold the |
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1606 // lock. |
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1607 assert(chunk != NULL, "Deallocating NULL"); |
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1608 assert_lock_strong(SpaceManager::expand_lock()); |
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1609 slow_locked_verify(); |
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1610 if (TraceMetadataChunkAllocation) { |
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1611 tty->print_cr("ChunkManager::chunk_freelist_deallocate: chunk " |
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1612 PTR_FORMAT " size " SIZE_FORMAT, |
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1613 chunk, chunk->word_size()); |
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1614 } |
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1615 free_chunks_put(chunk); |
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1616 } |
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1617 |
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1618 Metachunk* ChunkManager::free_chunks_get(size_t word_size) { |
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1619 assert_lock_strong(SpaceManager::expand_lock()); |
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1620 |
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1621 slow_locked_verify(); |
6885 | 1622 |
1623 Metachunk* chunk = NULL; | |
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1624 if (list_index(word_size) != HumongousIndex) { |
6885 | 1625 ChunkList* free_list = find_free_chunks_list(word_size); |
1626 assert(free_list != NULL, "Sanity check"); | |
1627 | |
1628 chunk = free_list->head(); | |
1629 debug_only(Metachunk* debug_head = chunk;) | |
1630 | |
1631 if (chunk == NULL) { | |
1632 return NULL; | |
1633 } | |
1634 | |
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1635 // Remove the chunk as the head of the list. |
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1636 free_list->set_head(chunk->next()); |
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1637 |
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1638 // Chunk is being removed from the chunks free list. |
6885 | 1639 dec_free_chunks_total(chunk->capacity_word_size()); |
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1640 |
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1641 if (TraceMetadataChunkAllocation && Verbose) { |
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1642 tty->print_cr("ChunkManager::free_chunks_get: free_list " |
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1643 PTR_FORMAT " head " PTR_FORMAT " size " SIZE_FORMAT, |
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1644 free_list, chunk, chunk->word_size()); |
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1645 } |
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1646 } else { |
6885 | 1647 chunk = humongous_dictionary()->get_chunk( |
1648 word_size, | |
1649 FreeBlockDictionary<Metachunk>::atLeast); | |
1650 | |
1651 if (chunk != NULL) { | |
1652 if (TraceMetadataHumongousAllocation) { | |
1653 size_t waste = chunk->word_size() - word_size; | |
1654 tty->print_cr("Free list allocate humongous chunk size " SIZE_FORMAT | |
1655 " for requested size " SIZE_FORMAT | |
1656 " waste " SIZE_FORMAT, | |
1657 chunk->word_size(), word_size, waste); | |
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1658 } |
6885 | 1659 // Chunk is being removed from the chunks free list. |
1660 dec_free_chunks_total(chunk->capacity_word_size()); | |
1661 #ifdef ASSERT | |
1662 chunk->set_is_free(false); | |
1663 #endif | |
7446
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1664 } else { |
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1665 return NULL; |
6885 | 1666 } |
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1667 } |
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1668 |
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1669 // Remove it from the links to this freelist |
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1670 chunk->set_next(NULL); |
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1671 chunk->set_prev(NULL); |
6969
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|
1672 slow_locked_verify(); |
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1673 return chunk; |
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1674 } |
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1675 |
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1676 Metachunk* ChunkManager::chunk_freelist_allocate(size_t word_size) { |
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1677 assert_lock_strong(SpaceManager::expand_lock()); |
6969
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|
1678 slow_locked_verify(); |
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1679 |
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1680 // Take from the beginning of the list |
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1681 Metachunk* chunk = free_chunks_get(word_size); |
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1682 if (chunk == NULL) { |
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1683 return NULL; |
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|
1684 } |
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1685 |
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1686 assert((word_size <= chunk->word_size()) || |
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1687 list_index(chunk->word_size() == HumongousIndex), |
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1688 "Non-humongous variable sized chunk"); |
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1689 if (TraceMetadataChunkAllocation) { |
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1690 size_t list_count; |
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1691 if (list_index(word_size) < HumongousIndex) { |
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1692 ChunkList* list = find_free_chunks_list(word_size); |
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1693 list_count = list->sum_list_count(); |
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1694 } else { |
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1695 list_count = humongous_dictionary()->total_count(); |
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1696 } |
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1697 tty->print("ChunkManager::chunk_freelist_allocate: " PTR_FORMAT " chunk " |
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1698 PTR_FORMAT " size " SIZE_FORMAT " count " SIZE_FORMAT " ", |
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1699 this, chunk, chunk->word_size(), list_count); |
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1700 locked_print_free_chunks(tty); |
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|
1701 } |
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|
1702 |
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1703 return chunk; |
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|
1704 } |
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|
1705 |
6885 | 1706 void ChunkManager::print_on(outputStream* out) { |
1707 if (PrintFLSStatistics != 0) { | |
1708 humongous_dictionary()->report_statistics(); | |
1709 } | |
1710 } | |
1711 | |
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1712 // SpaceManager methods |
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1713 |
7446
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1714 void SpaceManager::get_initial_chunk_sizes(Metaspace::MetaspaceType type, |
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1715 size_t* chunk_word_size, |
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1716 size_t* class_chunk_word_size) { |
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1717 switch (type) { |
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1718 case Metaspace::BootMetaspaceType: |
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1719 *chunk_word_size = Metaspace::first_chunk_word_size(); |
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1720 *class_chunk_word_size = Metaspace::first_class_chunk_word_size(); |
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1721 break; |
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|
1722 case Metaspace::ROMetaspaceType: |
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1723 *chunk_word_size = SharedReadOnlySize / wordSize; |
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1724 *class_chunk_word_size = ClassSpecializedChunk; |
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1725 break; |
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|
1726 case Metaspace::ReadWriteMetaspaceType: |
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1727 *chunk_word_size = SharedReadWriteSize / wordSize; |
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1728 *class_chunk_word_size = ClassSpecializedChunk; |
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|
1729 break; |
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|
1730 case Metaspace::AnonymousMetaspaceType: |
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1731 case Metaspace::ReflectionMetaspaceType: |
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|
1732 *chunk_word_size = SpecializedChunk; |
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1733 *class_chunk_word_size = ClassSpecializedChunk; |
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|
1734 break; |
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|
1735 default: |
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|
1736 *chunk_word_size = SmallChunk; |
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1737 *class_chunk_word_size = ClassSmallChunk; |
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|
1738 break; |
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|
1739 } |
8007
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7447
diff
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|
1740 assert(*chunk_word_size != 0 && *class_chunk_word_size != 0, |
7446
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1741 err_msg("Initial chunks sizes bad: data " SIZE_FORMAT |
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1742 " class " SIZE_FORMAT, |
8007
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7447
diff
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|
1743 *chunk_word_size, *class_chunk_word_size)); |
7446
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|
1744 } |
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|
1745 |
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1746 size_t SpaceManager::sum_free_in_chunks_in_use() const { |
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1747 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
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|
1748 size_t free = 0; |
7446
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1749 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
6725
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1750 Metachunk* chunk = chunks_in_use(i); |
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1751 while (chunk != NULL) { |
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1752 free += chunk->free_word_size(); |
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1753 chunk = chunk->next(); |
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|
1754 } |
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|
1755 } |
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|
1756 return free; |
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|
1757 } |
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|
1758 |
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1759 size_t SpaceManager::sum_waste_in_chunks_in_use() const { |
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1760 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
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|
1761 size_t result = 0; |
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1762 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
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1763 result += sum_waste_in_chunks_in_use(i); |
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|
1764 } |
6885 | 1765 |
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|
1766 return result; |
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|
1767 } |
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|
1768 |
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|
1769 size_t SpaceManager::sum_waste_in_chunks_in_use(ChunkIndex index) const { |
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|
1770 size_t result = 0; |
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|
1771 Metachunk* chunk = chunks_in_use(index); |
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|
1772 // Count the free space in all the chunk but not the |
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|
1773 // current chunk from which allocations are still being done. |
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|
1774 if (chunk != NULL) { |
6885 | 1775 Metachunk* prev = chunk; |
1776 while (chunk != NULL && chunk != current_chunk()) { | |
1777 result += chunk->free_word_size(); | |
1778 prev = chunk; | |
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|
1779 chunk = chunk->next(); |
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|
1780 } |
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|
1781 } |
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|
1782 return result; |
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|
1783 } |
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|
1784 |
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|
1785 size_t SpaceManager::sum_capacity_in_chunks_in_use() const { |
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|
1786 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
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|
1787 size_t sum = 0; |
7446
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1788 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
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1789 Metachunk* chunk = chunks_in_use(i); |
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1790 while (chunk != NULL) { |
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1791 // Just changed this sum += chunk->capacity_word_size(); |
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1792 // sum += chunk->word_size() - Metachunk::overhead(); |
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1793 sum += chunk->capacity_word_size(); |
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1794 chunk = chunk->next(); |
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1795 } |
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1796 } |
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1797 return sum; |
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1798 } |
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1799 |
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1800 size_t SpaceManager::sum_count_in_chunks_in_use() { |
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1801 size_t count = 0; |
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1802 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
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1803 count = count + sum_count_in_chunks_in_use(i); |
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1804 } |
6885 | 1805 |
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1806 return count; |
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1807 } |
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1808 |
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1809 size_t SpaceManager::sum_count_in_chunks_in_use(ChunkIndex i) { |
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1810 size_t count = 0; |
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1811 Metachunk* chunk = chunks_in_use(i); |
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1812 while (chunk != NULL) { |
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1813 count++; |
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1814 chunk = chunk->next(); |
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1815 } |
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1816 return count; |
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1817 } |
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1818 |
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1819 |
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1820 size_t SpaceManager::sum_used_in_chunks_in_use() const { |
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1821 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
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1822 size_t used = 0; |
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1823 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
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1824 Metachunk* chunk = chunks_in_use(i); |
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1825 while (chunk != NULL) { |
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1826 used += chunk->used_word_size(); |
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1827 chunk = chunk->next(); |
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1828 } |
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1829 } |
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1830 return used; |
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1831 } |
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1832 |
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1833 void SpaceManager::locked_print_chunks_in_use_on(outputStream* st) const { |
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1834 |
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1835 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
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1836 Metachunk* chunk = chunks_in_use(i); |
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1837 st->print("SpaceManager: %s " PTR_FORMAT, |
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1838 chunk_size_name(i), chunk); |
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1839 if (chunk != NULL) { |
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1840 st->print_cr(" free " SIZE_FORMAT, |
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1841 chunk->free_word_size()); |
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1842 } else { |
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1843 st->print_cr(""); |
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1844 } |
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1845 } |
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1846 |
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1847 vs_list()->chunk_manager()->locked_print_free_chunks(st); |
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1848 vs_list()->chunk_manager()->locked_print_sum_free_chunks(st); |
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1849 } |
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1850 |
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1851 size_t SpaceManager::calc_chunk_size(size_t word_size) { |
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1852 |
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1853 // Decide between a small chunk and a medium chunk. Up to |
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1854 // _small_chunk_limit small chunks can be allocated but |
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1855 // once a medium chunk has been allocated, no more small |
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1856 // chunks will be allocated. |
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1857 size_t chunk_word_size; |
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1858 if (chunks_in_use(MediumIndex) == NULL && |
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1859 (!has_small_chunk_limit() || |
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1860 sum_count_in_chunks_in_use(SmallIndex) < _small_chunk_limit)) { |
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1861 chunk_word_size = (size_t) small_chunk_size(); |
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1862 if (word_size + Metachunk::overhead() > small_chunk_size()) { |
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1863 chunk_word_size = medium_chunk_size(); |
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1864 } |
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1865 } else { |
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1866 chunk_word_size = medium_chunk_size(); |
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1867 } |
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1868 |
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1869 // Might still need a humongous chunk. Enforce an |
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1870 // eight word granularity to facilitate reuse (some |
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1871 // wastage but better chance of reuse). |
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1872 size_t if_humongous_sized_chunk = |
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1873 align_size_up(word_size + Metachunk::overhead(), |
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1874 HumongousChunkGranularity); |
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1875 chunk_word_size = |
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1876 MAX2((size_t) chunk_word_size, if_humongous_sized_chunk); |
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1877 |
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1878 assert(!SpaceManager::is_humongous(word_size) || |
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1879 chunk_word_size == if_humongous_sized_chunk, |
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1880 err_msg("Size calculation is wrong, word_size " SIZE_FORMAT |
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1881 " chunk_word_size " SIZE_FORMAT, |
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1882 word_size, chunk_word_size)); |
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1883 if (TraceMetadataHumongousAllocation && |
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1884 SpaceManager::is_humongous(word_size)) { |
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1885 gclog_or_tty->print_cr("Metadata humongous allocation:"); |
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1886 gclog_or_tty->print_cr(" word_size " PTR_FORMAT, word_size); |
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1887 gclog_or_tty->print_cr(" chunk_word_size " PTR_FORMAT, |
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1888 chunk_word_size); |
6885 | 1889 gclog_or_tty->print_cr(" chunk overhead " PTR_FORMAT, |
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1890 Metachunk::overhead()); |
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1891 } |
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1892 return chunk_word_size; |
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1893 } |
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1894 |
6885 | 1895 MetaWord* SpaceManager::grow_and_allocate(size_t word_size) { |
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1896 assert(vs_list()->current_virtual_space() != NULL, |
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1897 "Should have been set"); |
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1898 assert(current_chunk() == NULL || |
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1899 current_chunk()->allocate(word_size) == NULL, |
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1900 "Don't need to expand"); |
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1901 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag); |
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1902 |
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1903 if (TraceMetadataChunkAllocation && Verbose) { |
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1904 size_t words_left = 0; |
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1905 size_t words_used = 0; |
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1906 if (current_chunk() != NULL) { |
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1907 words_left = current_chunk()->free_word_size(); |
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1908 words_used = current_chunk()->used_word_size(); |
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1909 } |
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1910 gclog_or_tty->print_cr("SpaceManager::grow_and_allocate for " SIZE_FORMAT |
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1911 " words " SIZE_FORMAT " words used " SIZE_FORMAT |
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1912 " words left", |
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1913 word_size, words_used, words_left); |
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1914 } |
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1915 |
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1916 // Get another chunk out of the virtual space |
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1917 size_t grow_chunks_by_words = calc_chunk_size(word_size); |
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1918 Metachunk* next = get_new_chunk(word_size, grow_chunks_by_words); |
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1919 |
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1920 // If a chunk was available, add it to the in-use chunk list |
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1921 // and do an allocation from it. |
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1922 if (next != NULL) { |
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1923 Metadebug::deallocate_chunk_a_lot(this, grow_chunks_by_words); |
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1924 // Add to this manager's list of chunks in use. |
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1925 add_chunk(next, false); |
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1926 return next->allocate(word_size); |
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1927 } |
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1928 return NULL; |
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1929 } |
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1930 |
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1931 void SpaceManager::print_on(outputStream* st) const { |
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1932 |
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1933 for (ChunkIndex i = ZeroIndex; |
6885 | 1934 i < NumberOfInUseLists ; |
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1935 i = next_chunk_index(i) ) { |
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1936 st->print_cr(" chunks_in_use " PTR_FORMAT " chunk size " PTR_FORMAT, |
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1937 chunks_in_use(i), |
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1938 chunks_in_use(i) == NULL ? 0 : chunks_in_use(i)->word_size()); |
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1939 } |
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1940 st->print_cr(" waste: Small " SIZE_FORMAT " Medium " SIZE_FORMAT |
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1941 " Humongous " SIZE_FORMAT, |
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1942 sum_waste_in_chunks_in_use(SmallIndex), |
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1943 sum_waste_in_chunks_in_use(MediumIndex), |
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1944 sum_waste_in_chunks_in_use(HumongousIndex)); |
6885 | 1945 // block free lists |
1946 if (block_freelists() != NULL) { | |
1947 st->print_cr("total in block free lists " SIZE_FORMAT, | |
1948 block_freelists()->total_size()); | |
1949 } | |
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1950 } |
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1951 |
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1952 SpaceManager::SpaceManager(Mutex* lock, |
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1953 VirtualSpaceList* vs_list) : |
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1954 _vs_list(vs_list), |
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1955 _allocation_total(0), |
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1956 _lock(lock) |
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1957 { |
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1958 initialize(); |
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1959 } |
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1960 |
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1961 void SpaceManager::initialize() { |
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1962 Metadebug::init_allocation_fail_alot_count(); |
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1963 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
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1964 _chunks_in_use[i] = NULL; |
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1965 } |
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1966 _current_chunk = NULL; |
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1967 if (TraceMetadataChunkAllocation && Verbose) { |
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1968 gclog_or_tty->print_cr("SpaceManager(): " PTR_FORMAT, this); |
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1969 } |
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1970 } |
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1971 |
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1972 SpaceManager::~SpaceManager() { |
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1973 MutexLockerEx fcl(SpaceManager::expand_lock(), |
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1974 Mutex::_no_safepoint_check_flag); |
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1975 |
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1976 ChunkManager* chunk_manager = vs_list()->chunk_manager(); |
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1977 |
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1978 chunk_manager->slow_locked_verify(); |
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1979 |
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1980 if (TraceMetadataChunkAllocation && Verbose) { |
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1981 gclog_or_tty->print_cr("~SpaceManager(): " PTR_FORMAT, this); |
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1982 locked_print_chunks_in_use_on(gclog_or_tty); |
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1983 } |
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1984 |
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1985 // Mangle freed memory. |
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1986 NOT_PRODUCT(mangle_freed_chunks();) |
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1987 |
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1988 // Have to update before the chunks_in_use lists are emptied |
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1989 // below. |
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1990 chunk_manager->inc_free_chunks_total(sum_capacity_in_chunks_in_use(), |
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1991 sum_count_in_chunks_in_use()); |
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1992 |
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1993 // Add all the chunks in use by this space manager |
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1994 // to the global list of free chunks. |
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1995 |
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1996 // Follow each list of chunks-in-use and add them to the |
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1997 // free lists. Each list is NULL terminated. |
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1998 |
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1999 for (ChunkIndex i = ZeroIndex; i < HumongousIndex; i = next_chunk_index(i)) { |
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2000 if (TraceMetadataChunkAllocation && Verbose) { |
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2001 gclog_or_tty->print_cr("returned %d %s chunks to freelist", |
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2002 sum_count_in_chunks_in_use(i), |
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2003 chunk_size_name(i)); |
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2004 } |
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2005 Metachunk* chunks = chunks_in_use(i); |
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2006 chunk_manager->free_chunks(i)->add_at_head(chunks); |
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2007 set_chunks_in_use(i, NULL); |
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2008 if (TraceMetadataChunkAllocation && Verbose) { |
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2009 gclog_or_tty->print_cr("updated freelist count %d %s", |
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2010 chunk_manager->free_chunks(i)->sum_list_count(), |
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2011 chunk_size_name(i)); |
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2012 } |
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2013 assert(i != HumongousIndex, "Humongous chunks are handled explicitly later"); |
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2014 } |
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2015 |
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2016 // The medium chunk case may be optimized by passing the head and |
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2017 // tail of the medium chunk list to add_at_head(). The tail is often |
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2018 // the current chunk but there are probably exceptions. |
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2019 |
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2020 // Humongous chunks |
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2021 if (TraceMetadataChunkAllocation && Verbose) { |
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2022 gclog_or_tty->print_cr("returned %d %s humongous chunks to dictionary", |
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2023 sum_count_in_chunks_in_use(HumongousIndex), |
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2024 chunk_size_name(HumongousIndex)); |
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2025 gclog_or_tty->print("Humongous chunk dictionary: "); |
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2026 } |
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2027 // Humongous chunks are never the current chunk. |
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2028 Metachunk* humongous_chunks = chunks_in_use(HumongousIndex); |
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2029 |
6885 | 2030 while (humongous_chunks != NULL) { |
2031 #ifdef ASSERT | |
2032 humongous_chunks->set_is_free(true); | |
2033 #endif | |
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2034 if (TraceMetadataChunkAllocation && Verbose) { |
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2035 gclog_or_tty->print(PTR_FORMAT " (" SIZE_FORMAT ") ", |
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2036 humongous_chunks, |
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2037 humongous_chunks->word_size()); |
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2038 } |
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2039 assert(humongous_chunks->word_size() == (size_t) |
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2040 align_size_up(humongous_chunks->word_size(), |
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2041 HumongousChunkGranularity), |
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2042 err_msg("Humongous chunk size is wrong: word size " SIZE_FORMAT |
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2043 " granularity %d", |
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2044 humongous_chunks->word_size(), HumongousChunkGranularity)); |
6885 | 2045 Metachunk* next_humongous_chunks = humongous_chunks->next(); |
2046 chunk_manager->humongous_dictionary()->return_chunk(humongous_chunks); | |
2047 humongous_chunks = next_humongous_chunks; | |
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2048 } |
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2049 if (TraceMetadataChunkAllocation && Verbose) { |
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2050 gclog_or_tty->print_cr(""); |
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2051 gclog_or_tty->print_cr("updated dictionary count %d %s", |
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2052 chunk_manager->humongous_dictionary()->total_count(), |
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2053 chunk_size_name(HumongousIndex)); |
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2054 } |
6885 | 2055 set_chunks_in_use(HumongousIndex, NULL); |
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2056 chunk_manager->slow_locked_verify(); |
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2057 } |
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2058 |
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2059 const char* SpaceManager::chunk_size_name(ChunkIndex index) const { |
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2060 switch (index) { |
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2061 case SpecializedIndex: |
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2062 return "Specialized"; |
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2063 case SmallIndex: |
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2064 return "Small"; |
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2065 case MediumIndex: |
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2066 return "Medium"; |
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2067 case HumongousIndex: |
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2068 return "Humongous"; |
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2069 default: |
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2070 return NULL; |
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2071 } |
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2072 } |
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2073 |
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2074 ChunkIndex ChunkManager::list_index(size_t size) { |
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2075 switch (size) { |
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2076 case SpecializedChunk: |
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2077 assert(SpecializedChunk == ClassSpecializedChunk, |
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2078 "Need branch for ClassSpecializedChunk"); |
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2079 return SpecializedIndex; |
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2080 case SmallChunk: |
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2081 case ClassSmallChunk: |
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2082 return SmallIndex; |
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2083 case MediumChunk: |
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2084 case ClassMediumChunk: |
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2085 return MediumIndex; |
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2086 default: |
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2087 assert(size > MediumChunk || size > ClassMediumChunk, |
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2088 "Not a humongous chunk"); |
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2089 return HumongousIndex; |
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2090 } |
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2091 } |
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2092 |
6885 | 2093 void SpaceManager::deallocate(MetaWord* p, size_t word_size) { |
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2094 assert_lock_strong(_lock); |
6885 | 2095 size_t min_size = TreeChunk<Metablock, FreeList>::min_size(); |
2096 assert(word_size >= min_size, | |
2097 err_msg("Should not deallocate dark matter " SIZE_FORMAT, word_size)); | |
2098 block_freelists()->return_block(p, word_size); | |
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2099 } |
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2100 |
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2101 // Adds a chunk to the list of chunks in use. |
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2102 void SpaceManager::add_chunk(Metachunk* new_chunk, bool make_current) { |
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2103 |
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2104 assert(new_chunk != NULL, "Should not be NULL"); |
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2105 assert(new_chunk->next() == NULL, "Should not be on a list"); |
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2106 |
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2107 new_chunk->reset_empty(); |
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2108 |
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2109 // Find the correct list and and set the current |
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2110 // chunk for that list. |
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2111 ChunkIndex index = ChunkManager::list_index(new_chunk->word_size()); |
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2112 |
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2113 if (index != HumongousIndex) { |
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2114 set_current_chunk(new_chunk); |
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2115 new_chunk->set_next(chunks_in_use(index)); |
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2116 set_chunks_in_use(index, new_chunk); |
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2117 } else { |
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2118 // For null class loader data and DumpSharedSpaces, the first chunk isn't |
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2119 // small, so small will be null. Link this first chunk as the current |
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2120 // chunk. |
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2121 if (make_current) { |
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2122 // Set as the current chunk but otherwise treat as a humongous chunk. |
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2123 set_current_chunk(new_chunk); |
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2124 } |
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2125 // Link at head. The _current_chunk only points to a humongous chunk for |
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2126 // the null class loader metaspace (class and data virtual space managers) |
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2127 // any humongous chunks so will not point to the tail |
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2128 // of the humongous chunks list. |
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2129 new_chunk->set_next(chunks_in_use(HumongousIndex)); |
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2130 set_chunks_in_use(HumongousIndex, new_chunk); |
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2131 |
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2132 assert(new_chunk->word_size() > medium_chunk_size(), "List inconsistency"); |
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2133 } |
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2134 |
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2135 assert(new_chunk->is_empty(), "Not ready for reuse"); |
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2136 if (TraceMetadataChunkAllocation && Verbose) { |
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2137 gclog_or_tty->print("SpaceManager::add_chunk: %d) ", |
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2138 sum_count_in_chunks_in_use()); |
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2139 new_chunk->print_on(gclog_or_tty); |
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2140 vs_list()->chunk_manager()->locked_print_free_chunks(tty); |
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2141 } |
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2142 } |
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2143 |
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2144 Metachunk* SpaceManager::get_new_chunk(size_t word_size, |
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2145 size_t grow_chunks_by_words) { |
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2146 |
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2147 Metachunk* next = vs_list()->get_new_chunk(word_size, |
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2148 grow_chunks_by_words, |
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2149 medium_chunk_bunch()); |
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2150 |
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2151 if (TraceMetadataHumongousAllocation && |
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2152 SpaceManager::is_humongous(next->word_size())) { |
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2153 gclog_or_tty->print_cr(" new humongous chunk word size " PTR_FORMAT, |
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2154 next->word_size()); |
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2155 } |
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2156 |
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2157 return next; |
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2158 } |
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2159 |
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2160 MetaWord* SpaceManager::allocate(size_t word_size) { |
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2161 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
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2162 |
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2163 // If only the dictionary is going to be used (i.e., no |
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2164 // indexed free list), then there is a minimum size requirement. |
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2165 // MinChunkSize is a placeholder for the real minimum size JJJ |
6885 | 2166 size_t byte_size = word_size * BytesPerWord; |
2167 | |
2168 size_t byte_size_with_overhead = byte_size + Metablock::overhead(); | |
2169 | |
2170 size_t raw_bytes_size = MAX2(byte_size_with_overhead, | |
2171 Metablock::min_block_byte_size()); | |
2172 raw_bytes_size = ARENA_ALIGN(raw_bytes_size); | |
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2173 size_t raw_word_size = raw_bytes_size / BytesPerWord; |
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2174 assert(raw_word_size * BytesPerWord == raw_bytes_size, "Size problem"); |
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2175 |
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2176 BlockFreelist* fl = block_freelists(); |
6885 | 2177 MetaWord* p = NULL; |
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2178 // Allocation from the dictionary is expensive in the sense that |
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2179 // the dictionary has to be searched for a size. Don't allocate |
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2180 // from the dictionary until it starts to get fat. Is this |
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2181 // a reasonable policy? Maybe an skinny dictionary is fast enough |
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2182 // for allocations. Do some profiling. JJJ |
6885 | 2183 if (fl->total_size() > allocation_from_dictionary_limit) { |
2184 p = fl->get_block(raw_word_size); | |
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2185 } |
6885 | 2186 if (p == NULL) { |
2187 p = allocate_work(raw_word_size); | |
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2188 } |
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2189 Metadebug::deallocate_block_a_lot(this, raw_word_size); |
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2190 |
6885 | 2191 return p; |
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2192 } |
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2193 |
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2194 // Returns the address of spaced allocated for "word_size". |
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2195 // This methods does not know about blocks (Metablocks) |
6885 | 2196 MetaWord* SpaceManager::allocate_work(size_t word_size) { |
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2197 assert_lock_strong(_lock); |
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2198 #ifdef ASSERT |
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2199 if (Metadebug::test_metadata_failure()) { |
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2200 return NULL; |
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2201 } |
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2202 #endif |
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2203 // Is there space in the current chunk? |
6885 | 2204 MetaWord* result = NULL; |
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2205 |
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2206 // For DumpSharedSpaces, only allocate out of the current chunk which is |
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2207 // never null because we gave it the size we wanted. Caller reports out |
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2208 // of memory if this returns null. |
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2209 if (DumpSharedSpaces) { |
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2210 assert(current_chunk() != NULL, "should never happen"); |
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2211 inc_allocation_total(word_size); |
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2212 return current_chunk()->allocate(word_size); // caller handles null result |
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2213 } |
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2214 if (current_chunk() != NULL) { |
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2215 result = current_chunk()->allocate(word_size); |
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2216 } |
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2217 |
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2218 if (result == NULL) { |
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2219 result = grow_and_allocate(word_size); |
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2220 } |
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2221 if (result > 0) { |
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2222 inc_allocation_total(word_size); |
6885 | 2223 assert(result != (MetaWord*) chunks_in_use(MediumIndex), |
2224 "Head of the list is being allocated"); | |
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2225 } |
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2226 |
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2227 return result; |
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|
2228 } |
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2229 |
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2230 void SpaceManager::verify() { |
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2231 // If there are blocks in the dictionary, then |
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2232 // verfication of chunks does not work since |
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2233 // being in the dictionary alters a chunk. |
6885 | 2234 if (block_freelists()->total_size() == 0) { |
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2235 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
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2236 Metachunk* curr = chunks_in_use(i); |
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2237 while (curr != NULL) { |
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2238 curr->verify(); |
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2239 verify_chunk_size(curr); |
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2240 curr = curr->next(); |
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2241 } |
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2242 } |
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2243 } |
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2244 } |
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2245 |
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2246 void SpaceManager::verify_chunk_size(Metachunk* chunk) { |
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2247 assert(is_humongous(chunk->word_size()) || |
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2248 chunk->word_size() == medium_chunk_size() || |
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2249 chunk->word_size() == small_chunk_size() || |
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2250 chunk->word_size() == specialized_chunk_size(), |
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2251 "Chunk size is wrong"); |
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2252 return; |
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2253 } |
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2254 |
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2255 #ifdef ASSERT |
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2256 void SpaceManager::verify_allocation_total() { |
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2257 // Verification is only guaranteed at a safepoint. |
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2258 if (SafepointSynchronize::is_at_safepoint()) { |
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2259 gclog_or_tty->print_cr("Chunk " PTR_FORMAT " allocation_total " SIZE_FORMAT |
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2260 " sum_used_in_chunks_in_use " SIZE_FORMAT, |
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2261 this, |
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2262 allocation_total(), |
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2263 sum_used_in_chunks_in_use()); |
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2264 } |
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2265 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
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2266 assert(allocation_total() == sum_used_in_chunks_in_use(), |
8007
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|
2267 err_msg("allocation total is not consistent " SIZE_FORMAT |
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2268 " vs " SIZE_FORMAT, |
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2269 allocation_total(), sum_used_in_chunks_in_use())); |
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2270 } |
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|
2271 |
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2272 #endif |
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|
2273 |
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|
2274 void SpaceManager::dump(outputStream* const out) const { |
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2275 size_t curr_total = 0; |
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2276 size_t waste = 0; |
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2277 uint i = 0; |
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2278 size_t used = 0; |
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|
2279 size_t capacity = 0; |
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|
2280 |
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|
2281 // Add up statistics for all chunks in this SpaceManager. |
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2282 for (ChunkIndex index = ZeroIndex; |
6885 | 2283 index < NumberOfInUseLists; |
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2284 index = next_chunk_index(index)) { |
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|
2285 for (Metachunk* curr = chunks_in_use(index); |
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2286 curr != NULL; |
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2287 curr = curr->next()) { |
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|
2288 out->print("%d) ", i++); |
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|
2289 curr->print_on(out); |
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2290 if (TraceMetadataChunkAllocation && Verbose) { |
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|
2291 block_freelists()->print_on(out); |
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|
2292 } |
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2293 curr_total += curr->word_size(); |
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2294 used += curr->used_word_size(); |
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2295 capacity += curr->capacity_word_size(); |
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|
2296 waste += curr->free_word_size() + curr->overhead();; |
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2297 } |
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|
2298 } |
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2299 |
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2300 size_t free = current_chunk() == NULL ? 0 : current_chunk()->free_word_size(); |
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|
2301 // Free space isn't wasted. |
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2302 waste -= free; |
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2303 |
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2304 out->print_cr("total of all chunks " SIZE_FORMAT " used " SIZE_FORMAT |
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2305 " free " SIZE_FORMAT " capacity " SIZE_FORMAT |
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2306 " waste " SIZE_FORMAT, curr_total, used, free, capacity, waste); |
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2307 } |
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2308 |
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|
2309 #ifndef PRODUCT |
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2310 void SpaceManager::mangle_freed_chunks() { |
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2311 for (ChunkIndex index = ZeroIndex; |
6885 | 2312 index < NumberOfInUseLists; |
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2313 index = next_chunk_index(index)) { |
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2314 for (Metachunk* curr = chunks_in_use(index); |
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2315 curr != NULL; |
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2316 curr = curr->next()) { |
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2317 curr->mangle(); |
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2318 } |
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2319 } |
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2320 } |
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2321 #endif // PRODUCT |
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2322 |
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2323 // MetaspaceAux |
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2324 |
6734 | 2325 size_t MetaspaceAux::used_in_bytes(Metaspace::MetadataType mdtype) { |
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|
2326 size_t used = 0; |
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|
2327 ClassLoaderDataGraphMetaspaceIterator iter; |
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2328 while (iter.repeat()) { |
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|
2329 Metaspace* msp = iter.get_next(); |
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|
2330 // Sum allocation_total for each metaspace |
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2331 if (msp != NULL) { |
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|
2332 used += msp->used_words(mdtype); |
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|
2333 } |
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|
2334 } |
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|
2335 return used * BytesPerWord; |
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|
2336 } |
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|
2337 |
6725
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|
2338 size_t MetaspaceAux::free_in_bytes(Metaspace::MetadataType mdtype) { |
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|
2339 size_t free = 0; |
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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 free += msp->free_words(mdtype); |
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|
2345 } |
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|
2346 } |
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|
2347 return free * BytesPerWord; |
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|
2348 } |
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|
2349 |
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2350 size_t MetaspaceAux::capacity_in_bytes(Metaspace::MetadataType mdtype) { |
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2351 size_t capacity = free_chunks_total(mdtype); |
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|
2352 ClassLoaderDataGraphMetaspaceIterator iter; |
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|
2353 while (iter.repeat()) { |
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2354 Metaspace* msp = iter.get_next(); |
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2355 if (msp != NULL) { |
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2356 capacity += msp->capacity_words(mdtype); |
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|
2357 } |
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|
2358 } |
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|
2359 return capacity * BytesPerWord; |
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|
2360 } |
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|
2361 |
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2362 size_t MetaspaceAux::reserved_in_bytes(Metaspace::MetadataType mdtype) { |
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2363 size_t reserved = (mdtype == Metaspace::ClassType) ? |
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2364 Metaspace::class_space_list()->virtual_space_total() : |
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2365 Metaspace::space_list()->virtual_space_total(); |
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|
2366 return reserved * BytesPerWord; |
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|
2367 } |
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|
2368 |
7446
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|
2369 size_t MetaspaceAux::min_chunk_size() { return Metaspace::first_chunk_word_size(); } |
6725
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|
2370 |
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|
2371 size_t MetaspaceAux::free_chunks_total(Metaspace::MetadataType mdtype) { |
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2372 ChunkManager* chunk = (mdtype == Metaspace::ClassType) ? |
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|
2373 Metaspace::class_space_list()->chunk_manager() : |
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diff
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|
2374 Metaspace::space_list()->chunk_manager(); |
6969
6bc207d87e5d
7200229: NPG: possible performance issue exposed by closed/runtime/6559877/Test6559877.java
mgerdin
parents:
6885
diff
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|
2375 chunk->slow_verify(); |
6725
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|
2376 return chunk->free_chunks_total(); |
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diff
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|
2377 } |
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|
2378 |
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|
2379 size_t MetaspaceAux::free_chunks_total_in_bytes(Metaspace::MetadataType mdtype) { |
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2380 return free_chunks_total(mdtype) * BytesPerWord; |
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|
2381 } |
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|
2382 |
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|
2383 void MetaspaceAux::print_metaspace_change(size_t prev_metadata_used) { |
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|
2384 gclog_or_tty->print(", [Metaspace:"); |
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|
2385 if (PrintGCDetails && Verbose) { |
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|
2386 gclog_or_tty->print(" " SIZE_FORMAT |
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|
2387 "->" SIZE_FORMAT |
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|
2388 "(" SIZE_FORMAT "/" SIZE_FORMAT ")", |
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|
2389 prev_metadata_used, |
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diff
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|
2390 used_in_bytes(), |
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diff
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|
2391 capacity_in_bytes(), |
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|
2392 reserved_in_bytes()); |
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diff
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|
2393 } else { |
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diff
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|
2394 gclog_or_tty->print(" " SIZE_FORMAT "K" |
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diff
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|
2395 "->" SIZE_FORMAT "K" |
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|
2396 "(" SIZE_FORMAT "K/" SIZE_FORMAT "K)", |
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parents:
diff
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|
2397 prev_metadata_used / K, |
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diff
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|
2398 used_in_bytes()/ K, |
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diff
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|
2399 capacity_in_bytes()/K, |
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6964458: Reimplement class meta-data storage to use native memory
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parents:
diff
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|
2400 reserved_in_bytes()/ K); |
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parents:
diff
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|
2401 } |
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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 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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parents:
diff
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|
2403 gclog_or_tty->print("]"); |
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6964458: Reimplement class meta-data storage to use native memory
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parents:
diff
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|
2404 } |
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6964458: Reimplement class meta-data storage to use native memory
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diff
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|
2405 |
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6964458: Reimplement class meta-data storage to use native memory
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parents:
diff
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|
2406 // This is printed when PrintGCDetails |
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6964458: Reimplement class meta-data storage to use native memory
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parents:
diff
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|
2407 void MetaspaceAux::print_on(outputStream* out) { |
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6964458: Reimplement class meta-data storage to use native memory
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parents:
diff
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|
2408 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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|
2409 Metaspace::MetadataType nct = Metaspace::NonClassType; |
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6964458: Reimplement class meta-data storage to use native memory
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diff
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|
2410 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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parents:
diff
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|
2411 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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|
2412 SIZE_FORMAT "K, used " SIZE_FORMAT "K," |
da91efe96a93
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parents:
diff
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|
2413 " reserved " SIZE_FORMAT "K", |
6734 | 2414 capacity_in_bytes()/K, used_in_bytes()/K, reserved_in_bytes()/K); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
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|
2415 out->print_cr(" data space " |
da91efe96a93
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diff
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|
2416 SIZE_FORMAT "K, used " SIZE_FORMAT "K," |
da91efe96a93
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diff
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|
2417 " reserved " SIZE_FORMAT "K", |
6734 | 2418 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
coleenp
parents:
diff
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|
2419 out->print_cr(" class space " |
da91efe96a93
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diff
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|
2420 SIZE_FORMAT "K, used " SIZE_FORMAT "K," |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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diff
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|
2421 " reserved " SIZE_FORMAT "K", |
6734 | 2422 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
coleenp
parents:
diff
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|
2423 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
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|
2424 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2425 // Print information for class space and data space separately. |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2426 // This is almost the same as above. |
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diff
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|
2427 void MetaspaceAux::print_on(outputStream* out, Metaspace::MetadataType mdtype) { |
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6964458: Reimplement class meta-data storage to use native memory
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parents:
diff
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|
2428 size_t free_chunks_capacity_bytes = free_chunks_total_in_bytes(mdtype); |
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parents:
diff
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|
2429 size_t capacity_bytes = capacity_in_bytes(mdtype); |
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diff
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|
2430 size_t used_bytes = used_in_bytes(mdtype); |
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diff
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|
2431 size_t free_bytes = free_in_bytes(mdtype); |
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diff
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|
2432 size_t used_and_free = used_bytes + free_bytes + |
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diff
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|
2433 free_chunks_capacity_bytes; |
da91efe96a93
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diff
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|
2434 out->print_cr(" Chunk accounting: used in chunks " SIZE_FORMAT |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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diff
changeset
|
2435 "K + unused in chunks " SIZE_FORMAT "K + " |
da91efe96a93
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diff
changeset
|
2436 " capacity in free chunks " SIZE_FORMAT "K = " SIZE_FORMAT |
da91efe96a93
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coleenp
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diff
changeset
|
2437 "K capacity in allocated chunks " SIZE_FORMAT "K", |
da91efe96a93
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coleenp
parents:
diff
changeset
|
2438 used_bytes / K, |
da91efe96a93
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coleenp
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diff
changeset
|
2439 free_bytes / K, |
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diff
changeset
|
2440 free_chunks_capacity_bytes / K, |
da91efe96a93
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coleenp
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diff
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|
2441 used_and_free / K, |
da91efe96a93
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coleenp
parents:
diff
changeset
|
2442 capacity_bytes / K); |
da91efe96a93
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coleenp
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diff
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|
2443 assert(used_and_free == capacity_bytes, "Accounting is wrong"); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2444 } |
da91efe96a93
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coleenp
parents:
diff
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|
2445 |
da91efe96a93
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coleenp
parents:
diff
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|
2446 // Print total fragmentation for class and data metaspaces separately |
da91efe96a93
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diff
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|
2447 void MetaspaceAux::print_waste(outputStream* out) { |
da91efe96a93
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diff
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|
2448 |
7446
e51c9860cf66
8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
jmasa
parents:
7435
diff
changeset
|
2449 size_t specialized_waste = 0, small_waste = 0, medium_waste = 0, large_waste = 0; |
e51c9860cf66
8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
jmasa
parents:
7435
diff
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|
2450 size_t specialized_count = 0, small_count = 0, medium_count = 0, large_count = 0; |
e51c9860cf66
8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
jmasa
parents:
7435
diff
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|
2451 size_t cls_specialized_waste = 0, cls_small_waste = 0, cls_medium_waste = 0, cls_large_waste = 0; |
e51c9860cf66
8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
jmasa
parents:
7435
diff
changeset
|
2452 size_t cls_specialized_count = 0, cls_small_count = 0, cls_medium_count = 0, cls_large_count = 0; |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2453 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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diff
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|
2454 ClassLoaderDataGraphMetaspaceIterator iter; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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diff
changeset
|
2455 while (iter.repeat()) { |
da91efe96a93
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2456 Metaspace* msp = iter.get_next(); |
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|
2457 if (msp != NULL) { |
7446
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|
2458 specialized_waste += msp->vsm()->sum_waste_in_chunks_in_use(SpecializedIndex); |
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|
2459 specialized_count += msp->vsm()->sum_count_in_chunks_in_use(SpecializedIndex); |
6725
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2460 small_waste += msp->vsm()->sum_waste_in_chunks_in_use(SmallIndex); |
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|
2461 small_count += msp->vsm()->sum_count_in_chunks_in_use(SmallIndex); |
6725
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|
2462 medium_waste += msp->vsm()->sum_waste_in_chunks_in_use(MediumIndex); |
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|
2463 medium_count += msp->vsm()->sum_count_in_chunks_in_use(MediumIndex); |
6725
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2464 large_waste += msp->vsm()->sum_waste_in_chunks_in_use(HumongousIndex); |
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2465 large_count += msp->vsm()->sum_count_in_chunks_in_use(HumongousIndex); |
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|
2466 |
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2467 cls_specialized_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SpecializedIndex); |
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2468 cls_specialized_count += msp->class_vsm()->sum_count_in_chunks_in_use(SpecializedIndex); |
6725
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2469 cls_small_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SmallIndex); |
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2470 cls_small_count += msp->class_vsm()->sum_count_in_chunks_in_use(SmallIndex); |
6725
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2471 cls_medium_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(MediumIndex); |
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2472 cls_medium_count += msp->class_vsm()->sum_count_in_chunks_in_use(MediumIndex); |
6725
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2473 cls_large_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(HumongousIndex); |
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2474 cls_large_count += msp->class_vsm()->sum_count_in_chunks_in_use(HumongousIndex); |
6725
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|
2475 } |
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|
2476 } |
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|
2477 out->print_cr("Total fragmentation waste (words) doesn't count free space"); |
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2478 out->print_cr(" data: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", " |
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|
2479 SIZE_FORMAT " small(s) " SIZE_FORMAT ", " |
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|
2480 SIZE_FORMAT " medium(s) " SIZE_FORMAT, |
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2481 specialized_count, specialized_waste, small_count, |
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2482 small_waste, medium_count, medium_waste); |
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2483 out->print_cr(" class: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", " |
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2484 SIZE_FORMAT " small(s) " SIZE_FORMAT, |
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2485 cls_specialized_count, cls_specialized_waste, |
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|
2486 cls_small_count, cls_small_waste); |
6725
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|
2487 } |
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|
2488 |
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|
2489 // Dump global metaspace things from the end of ClassLoaderDataGraph |
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|
2490 void MetaspaceAux::dump(outputStream* out) { |
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diff
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|
2491 out->print_cr("All Metaspace:"); |
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|
2492 out->print("data space: "); print_on(out, Metaspace::NonClassType); |
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|
2493 out->print("class space: "); print_on(out, Metaspace::ClassType); |
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|
2494 print_waste(out); |
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diff
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|
2495 } |
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|
2496 |
6969
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6885
diff
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|
2497 void MetaspaceAux::verify_free_chunks() { |
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mgerdin
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6885
diff
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|
2498 Metaspace::space_list()->chunk_manager()->verify(); |
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mgerdin
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diff
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|
2499 Metaspace::class_space_list()->chunk_manager()->verify(); |
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diff
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|
2500 } |
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|
2501 |
6725
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|
2502 // Metaspace methods |
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|
2503 |
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2504 size_t Metaspace::_first_chunk_word_size = 0; |
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|
2505 size_t Metaspace::_first_class_chunk_word_size = 0; |
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|
2506 |
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|
2507 Metaspace::Metaspace(Mutex* lock, MetaspaceType type) { |
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|
2508 initialize(lock, type); |
6725
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diff
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|
2509 } |
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|
2510 |
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|
2511 Metaspace::~Metaspace() { |
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|
2512 delete _vsm; |
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diff
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|
2513 delete _class_vsm; |
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diff
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|
2514 } |
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diff
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|
2515 |
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|
2516 VirtualSpaceList* Metaspace::_space_list = NULL; |
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|
2517 VirtualSpaceList* Metaspace::_class_space_list = NULL; |
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|
2518 |
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|
2519 #define VIRTUALSPACEMULTIPLIER 2 |
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diff
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|
2520 |
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diff
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|
2521 void Metaspace::global_initialize() { |
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6964458: Reimplement class meta-data storage to use native memory
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diff
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|
2522 // Initialize the alignment for shared spaces. |
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|
2523 int max_alignment = os::vm_page_size(); |
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|
2524 MetaspaceShared::set_max_alignment(max_alignment); |
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diff
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|
2525 |
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diff
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|
2526 if (DumpSharedSpaces) { |
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diff
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|
2527 SharedReadOnlySize = align_size_up(SharedReadOnlySize, max_alignment); |
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diff
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|
2528 SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment); |
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diff
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|
2529 SharedMiscDataSize = align_size_up(SharedMiscDataSize, max_alignment); |
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diff
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|
2530 SharedMiscCodeSize = align_size_up(SharedMiscCodeSize, max_alignment); |
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diff
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|
2531 |
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|
2532 // Initialize with the sum of the shared space sizes. The read-only |
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diff
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|
2533 // and read write metaspace chunks will be allocated out of this and the |
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coleenp
parents:
diff
changeset
|
2534 // remainder is the misc code and data chunks. |
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diff
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|
2535 size_t total = align_size_up(SharedReadOnlySize + SharedReadWriteSize + |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2536 SharedMiscDataSize + SharedMiscCodeSize, |
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6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2537 os::vm_allocation_granularity()); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2538 size_t word_size = total/wordSize; |
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6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
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|
2539 _space_list = new VirtualSpaceList(word_size); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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diff
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|
2540 } else { |
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diff
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|
2541 // If using shared space, open the file that contains the shared space |
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diff
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|
2542 // and map in the memory before initializing the rest of metaspace (so |
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6964458: Reimplement class meta-data storage to use native memory
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parents:
diff
changeset
|
2543 // the addresses don't conflict) |
da91efe96a93
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diff
changeset
|
2544 if (UseSharedSpaces) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2545 FileMapInfo* mapinfo = new FileMapInfo(); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2546 memset(mapinfo, 0, sizeof(FileMapInfo)); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
changeset
|
2547 |
da91efe96a93
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|
2548 // Open the shared archive file, read and validate the header. If |
da91efe96a93
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parents:
diff
changeset
|
2549 // initialization fails, shared spaces [UseSharedSpaces] are |
da91efe96a93
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coleenp
parents:
diff
changeset
|
2550 // disabled and the file is closed. |
da91efe96a93
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coleenp
parents:
diff
changeset
|
2551 // Map in spaces now also |
da91efe96a93
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parents:
diff
changeset
|
2552 if (mapinfo->initialize() && MetaspaceShared::map_shared_spaces(mapinfo)) { |
da91efe96a93
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coleenp
parents:
diff
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|
2553 FileMapInfo::set_current_info(mapinfo); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2554 } else { |
da91efe96a93
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diff
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|
2555 assert(!mapinfo->is_open() && !UseSharedSpaces, |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
changeset
|
2556 "archive file not closed or shared spaces not disabled."); |
da91efe96a93
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coleenp
parents:
diff
changeset
|
2557 } |
da91efe96a93
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coleenp
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diff
changeset
|
2558 } |
da91efe96a93
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coleenp
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diff
changeset
|
2559 |
7446
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|
2560 // Initialize these before initializing the VirtualSpaceList |
6725
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diff
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|
2561 _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord; |
7446
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7435
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|
2562 _first_chunk_word_size = align_word_size_up(_first_chunk_word_size); |
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|
2563 // Make the first class chunk bigger than a medium chunk so it's not put |
e51c9860cf66
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diff
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|
2564 // on the medium chunk list. The next chunk will be small and progress |
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diff
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|
2565 // from there. This size calculated by -version. |
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|
2566 _first_class_chunk_word_size = MIN2((size_t)MediumChunk*6, |
e51c9860cf66
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diff
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|
2567 (ClassMetaspaceSize/BytesPerWord)*2); |
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7435
diff
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|
2568 _first_class_chunk_word_size = align_word_size_up(_first_class_chunk_word_size); |
6725
da91efe96a93
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coleenp
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diff
changeset
|
2569 // Arbitrarily set the initial virtual space to a multiple |
da91efe96a93
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coleenp
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diff
changeset
|
2570 // of the boot class loader size. |
7446
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7435
diff
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|
2571 size_t word_size = VIRTUALSPACEMULTIPLIER * first_chunk_word_size(); |
6725
da91efe96a93
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coleenp
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diff
changeset
|
2572 // Initialize the list of virtual spaces. |
da91efe96a93
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coleenp
parents:
diff
changeset
|
2573 _space_list = new VirtualSpaceList(word_size); |
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|
2574 } |
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|
2575 } |
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|
2576 |
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|
2577 // For UseCompressedKlassPointers the class space is reserved as a piece of the |
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|
2578 // Java heap because the compression algorithm is the same for each. The |
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|
2579 // argument passed in is at the top of the compressed space |
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|
2580 void Metaspace::initialize_class_space(ReservedSpace rs) { |
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|
2581 // The reserved space size may be bigger because of alignment, esp with UseLargePages |
8007
d9058e388631
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mikael
parents:
7447
diff
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|
2582 assert(rs.size() >= ClassMetaspaceSize, |
d9058e388631
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mikael
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|
2583 err_msg(SIZE_FORMAT " != " UINTX_FORMAT, rs.size(), ClassMetaspaceSize)); |
6725
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|
2584 _class_space_list = new VirtualSpaceList(rs); |
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|
2585 } |
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|
2586 |
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2587 void Metaspace::initialize(Mutex* lock, |
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|
2588 MetaspaceType type) { |
6725
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|
2589 |
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|
2590 assert(space_list() != NULL, |
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|
2591 "Metadata VirtualSpaceList has not been initialized"); |
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|
2592 |
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|
2593 _vsm = new SpaceManager(lock, space_list()); |
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|
2594 if (_vsm == NULL) { |
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|
2595 return; |
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diff
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|
2596 } |
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|
2597 size_t word_size; |
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2598 size_t class_word_size; |
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2599 vsm()->get_initial_chunk_sizes(type, |
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2600 &word_size, |
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|
2601 &class_word_size); |
6725
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2602 |
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2603 assert(class_space_list() != NULL, |
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|
2604 "Class VirtualSpaceList has not been initialized"); |
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|
2605 |
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2606 // Allocate SpaceManager for classes. |
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2607 _class_vsm = new SpaceManager(lock, class_space_list()); |
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2608 if (_class_vsm == NULL) { |
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|
2609 return; |
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|
2610 } |
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2611 |
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2612 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag); |
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2613 |
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2614 // Allocate chunk for metadata objects |
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2615 Metachunk* new_chunk = |
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2616 space_list()->get_initialization_chunk(word_size, |
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2617 vsm()->medium_chunk_bunch()); |
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2618 assert(!DumpSharedSpaces || new_chunk != NULL, "should have enough space for both chunks"); |
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2619 if (new_chunk != NULL) { |
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2620 // Add to this manager's list of chunks in use and current_chunk(). |
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2621 vsm()->add_chunk(new_chunk, true); |
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|
2622 } |
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2623 |
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2624 // Allocate chunk for class metadata objects |
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2625 Metachunk* class_chunk = |
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2626 class_space_list()->get_initialization_chunk(class_word_size, |
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|
2627 class_vsm()->medium_chunk_bunch()); |
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2628 if (class_chunk != NULL) { |
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2629 class_vsm()->add_chunk(class_chunk, true); |
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|
2630 } |
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|
2631 } |
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2632 |
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|
2633 size_t Metaspace::align_word_size_up(size_t word_size) { |
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2634 size_t byte_size = word_size * wordSize; |
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2635 return ReservedSpace::allocation_align_size_up(byte_size) / wordSize; |
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|
2636 } |
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|
2637 |
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2638 MetaWord* Metaspace::allocate(size_t word_size, MetadataType mdtype) { |
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2639 // DumpSharedSpaces doesn't use class metadata area (yet) |
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2640 if (mdtype == ClassType && !DumpSharedSpaces) { |
6885 | 2641 return class_vsm()->allocate(word_size); |
6725
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2642 } else { |
6885 | 2643 return vsm()->allocate(word_size); |
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|
2644 } |
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|
2645 } |
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2646 |
6753
8da5e203b993
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jmasa
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diff
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|
2647 MetaWord* Metaspace::expand_and_allocate(size_t word_size, MetadataType mdtype) { |
8da5e203b993
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|
2648 MetaWord* result; |
8da5e203b993
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diff
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|
2649 MetaspaceGC::set_expand_after_GC(true); |
8da5e203b993
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|
2650 size_t before_inc = MetaspaceGC::capacity_until_GC(); |
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jmasa
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diff
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|
2651 size_t delta_words = MetaspaceGC::delta_capacity_until_GC(word_size); |
8da5e203b993
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|
2652 MetaspaceGC::inc_capacity_until_GC(delta_words); |
8da5e203b993
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jmasa
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|
2653 if (PrintGCDetails && Verbose) { |
8da5e203b993
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parents:
6736
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|
2654 gclog_or_tty->print_cr("Increase capacity to GC from " SIZE_FORMAT |
8da5e203b993
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
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6736
diff
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|
2655 " to " SIZE_FORMAT, before_inc, MetaspaceGC::capacity_until_GC()); |
8da5e203b993
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|
2656 } |
6885 | 2657 |
6753
8da5e203b993
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|
2658 result = allocate(word_size, mdtype); |
8da5e203b993
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diff
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|
2659 |
8da5e203b993
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diff
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|
2660 return result; |
8da5e203b993
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jmasa
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6736
diff
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|
2661 } |
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diff
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|
2662 |
6725
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|
2663 // Space allocated in the Metaspace. This may |
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diff
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|
2664 // be across several metadata virtual spaces. |
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|
2665 char* Metaspace::bottom() const { |
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|
2666 assert(DumpSharedSpaces, "only useful and valid for dumping shared spaces"); |
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|
2667 return (char*)vsm()->current_chunk()->bottom(); |
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|
2668 } |
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|
2669 |
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|
2670 size_t Metaspace::used_words(MetadataType mdtype) const { |
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|
2671 // return vsm()->allocation_total(); |
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|
2672 return mdtype == ClassType ? class_vsm()->sum_used_in_chunks_in_use() : |
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|
2673 vsm()->sum_used_in_chunks_in_use(); // includes overhead! |
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|
2674 } |
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|
2675 |
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|
2676 size_t Metaspace::free_words(MetadataType mdtype) const { |
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|
2677 return mdtype == ClassType ? class_vsm()->sum_free_in_chunks_in_use() : |
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|
2678 vsm()->sum_free_in_chunks_in_use(); |
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|
2679 } |
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|
2680 |
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|
2681 // Space capacity in the Metaspace. It includes |
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|
2682 // space in the list of chunks from which allocations |
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|
2683 // have been made. Don't include space in the global freelist and |
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diff
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|
2684 // in the space available in the dictionary which |
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diff
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|
2685 // is already counted in some chunk. |
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|
2686 size_t Metaspace::capacity_words(MetadataType mdtype) const { |
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|
2687 return mdtype == ClassType ? class_vsm()->sum_capacity_in_chunks_in_use() : |
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|
2688 vsm()->sum_capacity_in_chunks_in_use(); |
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|
2689 } |
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|
2690 |
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|
2691 void Metaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) { |
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|
2692 if (SafepointSynchronize::is_at_safepoint()) { |
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|
2693 assert(Thread::current()->is_VM_thread(), "should be the VM thread"); |
6885 | 2694 // Don't take Heap_lock |
2695 MutexLocker ml(vsm()->lock()); | |
2696 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) { | |
2697 // Dark matter. Too small for dictionary. | |
2698 #ifdef ASSERT | |
2699 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5); | |
2700 #endif | |
2701 return; | |
6725
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|
2702 } |
6885 | 2703 if (is_class) { |
2704 class_vsm()->deallocate(ptr, word_size); | |
2705 } else { | |
2706 vsm()->deallocate(ptr, word_size); | |
2707 } | |
6725
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|
2708 } else { |
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|
2709 MutexLocker ml(vsm()->lock()); |
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|
2710 |
6885 | 2711 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) { |
2712 // Dark matter. Too small for dictionary. | |
2713 #ifdef ASSERT | |
2714 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5); | |
2715 #endif | |
2716 return; | |
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2717 } |
6885 | 2718 if (is_class) { |
2719 class_vsm()->deallocate(ptr, word_size); | |
2720 } else { | |
2721 vsm()->deallocate(ptr, word_size); | |
2722 } | |
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2723 } |
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2724 } |
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2725 |
6885 | 2726 Metablock* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size, |
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2727 bool read_only, MetadataType mdtype, TRAPS) { |
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2728 if (HAS_PENDING_EXCEPTION) { |
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2729 assert(false, "Should not allocate with exception pending"); |
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2730 return NULL; // caller does a CHECK_NULL too |
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2731 } |
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2732 |
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2733 // SSS: Should we align the allocations and make sure the sizes are aligned. |
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2734 MetaWord* result = NULL; |
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2735 |
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2736 assert(loader_data != NULL, "Should never pass around a NULL loader_data. " |
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2737 "ClassLoaderData::the_null_class_loader_data() should have been used."); |
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2738 // Allocate in metaspaces without taking out a lock, because it deadlocks |
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2739 // with the SymbolTable_lock. Dumping is single threaded for now. We'll have |
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2740 // to revisit this for application class data sharing. |
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2741 if (DumpSharedSpaces) { |
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2742 if (read_only) { |
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2743 result = loader_data->ro_metaspace()->allocate(word_size, NonClassType); |
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2744 } else { |
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2745 result = loader_data->rw_metaspace()->allocate(word_size, NonClassType); |
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2746 } |
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2747 if (result == NULL) { |
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2748 report_out_of_shared_space(read_only ? SharedReadOnly : SharedReadWrite); |
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2749 } |
6885 | 2750 return Metablock::initialize(result, word_size); |
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2751 } |
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2752 |
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2753 result = loader_data->metaspace_non_null()->allocate(word_size, mdtype); |
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2754 |
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2755 if (result == NULL) { |
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2756 // Try to clean out some memory and retry. |
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2757 result = |
6885 | 2758 Universe::heap()->collector_policy()->satisfy_failed_metadata_allocation( |
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2759 loader_data, word_size, mdtype); |
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2760 |
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2761 // If result is still null, we are out of memory. |
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2762 if (result == NULL) { |
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2763 if (Verbose && TraceMetadataChunkAllocation) { |
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2764 gclog_or_tty->print_cr("Metaspace allocation failed for size " |
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2765 SIZE_FORMAT, word_size); |
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2766 if (loader_data->metaspace_or_null() != NULL) loader_data->metaspace_or_null()->dump(gclog_or_tty); |
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2767 MetaspaceAux::dump(gclog_or_tty); |
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2768 } |
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2769 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support |
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2770 report_java_out_of_memory("Metadata space"); |
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2771 |
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2772 if (JvmtiExport::should_post_resource_exhausted()) { |
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2773 JvmtiExport::post_resource_exhausted( |
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2774 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR, |
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2775 "Metadata space"); |
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2776 } |
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2777 THROW_OOP_0(Universe::out_of_memory_error_perm_gen()); |
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2778 } |
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2779 } |
6885 | 2780 return Metablock::initialize(result, word_size); |
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2781 } |
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2782 |
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2783 void Metaspace::print_on(outputStream* out) const { |
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2784 // Print both class virtual space counts and metaspace. |
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2785 if (Verbose) { |
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2786 vsm()->print_on(out); |
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2787 class_vsm()->print_on(out); |
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2788 } |
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2789 } |
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2790 |
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2791 bool Metaspace::contains(const void * ptr) { |
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2792 if (MetaspaceShared::is_in_shared_space(ptr)) { |
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2793 return true; |
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2794 } |
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2795 // This is checked while unlocked. As long as the virtualspaces are added |
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2796 // at the end, the pointer will be in one of them. The virtual spaces |
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2797 // aren't deleted presently. When they are, some sort of locking might |
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2798 // be needed. Note, locking this can cause inversion problems with the |
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2799 // caller in MetaspaceObj::is_metadata() function. |
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2800 return space_list()->contains(ptr) || class_space_list()->contains(ptr); |
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2801 } |
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2802 |
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2803 void Metaspace::verify() { |
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2804 vsm()->verify(); |
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2805 class_vsm()->verify(); |
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2806 } |
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2807 |
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2808 void Metaspace::dump(outputStream* const out) const { |
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2809 if (UseMallocOnly) { |
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2810 // Just print usage for now |
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2811 out->print_cr("usage %d", used_words(Metaspace::NonClassType)); |
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2812 } |
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2813 out->print_cr("\nVirtual space manager: " INTPTR_FORMAT, vsm()); |
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2814 vsm()->dump(out); |
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2815 out->print_cr("\nClass space manager: " INTPTR_FORMAT, class_vsm()); |
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2816 class_vsm()->dump(out); |
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2817 } |