Mercurial > hg > truffle
annotate src/share/vm/memory/metaspace.hpp @ 10242:b0d20fa374b4
8013872: G1: HeapRegionSeq::shrink_by() has invalid assert
Summary: Refactored shrink_by() to only use region counts and not byte sizes
Reviewed-by: johnc, tschatzl
author | brutisso |
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date | Mon, 06 May 2013 21:30:34 +0200 |
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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 #ifndef SHARE_VM_MEMORY_METASPACE_HPP |
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25 #define SHARE_VM_MEMORY_METASPACE_HPP |
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26 |
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27 #include "memory/allocation.hpp" |
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28 #include "memory/memRegion.hpp" |
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29 #include "runtime/virtualspace.hpp" |
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30 #include "utilities/exceptions.hpp" |
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31 |
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32 // Metaspace |
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33 // |
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34 // Metaspaces are Arenas for the VM's metadata. |
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35 // They are allocated one per class loader object, and one for the null |
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36 // bootstrap class loader |
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37 // Eventually for bootstrap loader we'll have a read-only section and read-write |
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38 // to write for DumpSharedSpaces and read for UseSharedSpaces |
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39 // |
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40 // block X ---+ +-------------------+ |
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41 // | | Virtualspace | |
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42 // | | | |
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43 // | | | |
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44 // | |-------------------| |
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45 // | || Chunk | |
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46 // | || | |
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47 // | ||---------- | |
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48 // +------>||| block 0 | | |
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49 // ||---------- | |
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50 // ||| block 1 | | |
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51 // ||---------- | |
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52 // || | |
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53 // |-------------------| |
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54 // | | |
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55 // | | |
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56 // +-------------------+ |
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57 // |
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58 |
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59 class ClassLoaderData; |
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61 class MetaWord; |
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62 class Mutex; |
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63 class outputStream; |
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64 class SpaceManager; |
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65 |
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66 // Metaspaces each have a SpaceManager and allocations |
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67 // are done by the SpaceManager. Allocations are done |
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68 // out of the current Metachunk. When the current Metachunk |
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69 // is exhausted, the SpaceManager gets a new one from |
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70 // the current VirtualSpace. When the VirtualSpace is exhausted |
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71 // the SpaceManager gets a new one. The SpaceManager |
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72 // also manages freelists of available Chunks. |
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73 // |
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74 // Currently the space manager maintains the list of |
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75 // virtual spaces and the list of chunks in use. Its |
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76 // allocate() method returns a block for use as a |
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77 // quantum of metadata. |
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78 |
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79 class VirtualSpaceList; |
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80 |
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81 class Metaspace : public CHeapObj<mtClass> { |
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82 friend class VMStructs; |
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83 friend class SpaceManager; |
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84 friend class VM_CollectForMetadataAllocation; |
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85 friend class MetaspaceGC; |
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86 friend class MetaspaceAux; |
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87 |
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88 public: |
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89 enum MetadataType {ClassType, NonClassType}; |
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90 enum MetaspaceType { |
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91 StandardMetaspaceType, |
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92 BootMetaspaceType, |
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93 ROMetaspaceType, |
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94 ReadWriteMetaspaceType, |
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95 AnonymousMetaspaceType, |
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96 ReflectionMetaspaceType |
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97 }; |
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98 |
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99 private: |
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100 void initialize(Mutex* lock, MetaspaceType type); |
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101 |
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102 // Align up the word size to the allocation word size |
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103 static size_t align_word_size_up(size_t); |
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104 |
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105 static size_t _first_chunk_word_size; |
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106 static size_t _first_class_chunk_word_size; |
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107 |
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108 SpaceManager* _vsm; |
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109 SpaceManager* vsm() const { return _vsm; } |
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110 |
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111 SpaceManager* _class_vsm; |
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112 SpaceManager* class_vsm() const { return _class_vsm; } |
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113 |
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114 // Allocate space for metadata of type mdtype. This is space |
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115 // within a Metachunk and is used by |
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116 // allocate(ClassLoaderData*, size_t, bool, MetadataType, TRAPS) |
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117 // which returns a Metablock. |
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118 MetaWord* allocate(size_t word_size, MetadataType mdtype); |
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119 |
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120 // Virtual Space lists for both classes and other metadata |
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121 static VirtualSpaceList* _space_list; |
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122 static VirtualSpaceList* _class_space_list; |
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123 |
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124 static VirtualSpaceList* space_list() { return _space_list; } |
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125 static VirtualSpaceList* class_space_list() { return _class_space_list; } |
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126 |
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127 public: |
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128 |
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129 Metaspace(Mutex* lock, MetaspaceType type); |
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130 ~Metaspace(); |
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131 |
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132 // Initialize globals for Metaspace |
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133 static void global_initialize(); |
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134 static void initialize_class_space(ReservedSpace rs); |
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135 |
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136 static size_t first_chunk_word_size() { return _first_chunk_word_size; } |
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137 static size_t first_class_chunk_word_size() { return _first_class_chunk_word_size; } |
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138 |
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139 char* bottom() const; |
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140 size_t used_words_slow(MetadataType mdtype) const; |
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141 size_t free_words(MetadataType mdtype) const; |
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142 size_t capacity_words_slow(MetadataType mdtype) const; |
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143 size_t waste_words(MetadataType mdtype) const; |
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144 |
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145 size_t used_bytes_slow(MetadataType mdtype) const; |
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146 size_t capacity_bytes_slow(MetadataType mdtype) const; |
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147 |
6885 | 148 static Metablock* allocate(ClassLoaderData* loader_data, size_t size, |
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149 bool read_only, MetadataType mdtype, TRAPS); |
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150 void deallocate(MetaWord* ptr, size_t byte_size, bool is_class); |
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151 |
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152 MetaWord* expand_and_allocate(size_t size, |
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153 MetadataType mdtype); |
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154 |
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155 static bool is_initialized() { return _class_space_list != NULL; } |
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156 |
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157 static bool contains(const void *ptr); |
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158 void dump(outputStream* const out) const; |
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159 |
10175 | 160 // Free empty virtualspaces |
161 static void purge(); | |
162 | |
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163 void print_on(outputStream* st) const; |
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164 // Debugging support |
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165 void verify(); |
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166 }; |
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167 |
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168 class MetaspaceAux : AllStatic { |
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169 |
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170 // Statistics for class space and data space in metaspace. |
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171 |
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172 // These methods iterate over the classloader data graph |
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173 // for the given Metaspace type. These are slow. |
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174 static size_t used_bytes_slow(Metaspace::MetadataType mdtype); |
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175 static size_t free_in_bytes(Metaspace::MetadataType mdtype); |
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176 static size_t capacity_bytes_slow(Metaspace::MetadataType mdtype); |
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177 |
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178 // Iterates over the virtual space list. |
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179 static size_t reserved_in_bytes(Metaspace::MetadataType mdtype); |
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180 |
8827 | 181 static size_t free_chunks_total(Metaspace::MetadataType mdtype); |
182 static size_t free_chunks_total_in_bytes(Metaspace::MetadataType mdtype); | |
183 | |
184 public: | |
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185 // Running sum of space in all Metachunks that has been |
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186 // allocated to a Metaspace. This is used instead of |
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187 // iterating over all the classloaders |
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188 static size_t _allocated_capacity_words; |
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189 // Running sum of space in all Metachunks that have |
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190 // are being used for metadata. |
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191 static size_t _allocated_used_words; |
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192 |
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193 public: |
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194 // Decrement and increment _allocated_capacity_words |
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195 static void dec_capacity(size_t words); |
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196 static void inc_capacity(size_t words); |
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197 |
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198 // Decrement and increment _allocated_used_words |
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199 static void dec_used(size_t words); |
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200 static void inc_used(size_t words); |
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201 |
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202 // Total of space allocated to metadata in all Metaspaces. |
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203 // This sums the space used in each Metachunk by |
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204 // iterating over the classloader data graph |
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205 static size_t used_bytes_slow() { |
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206 return used_bytes_slow(Metaspace::ClassType) + |
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207 used_bytes_slow(Metaspace::NonClassType); |
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208 } |
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209 |
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210 // Used by MetaspaceCounters |
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211 static size_t free_chunks_total(); |
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212 static size_t free_chunks_total_in_bytes(); |
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213 |
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214 static size_t allocated_capacity_words() { |
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215 return _allocated_capacity_words; |
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216 } |
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217 static size_t allocated_capacity_bytes() { |
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218 return _allocated_capacity_words * BytesPerWord; |
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219 } |
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220 |
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221 static size_t allocated_used_words() { |
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222 return _allocated_used_words; |
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223 } |
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224 static size_t allocated_used_bytes() { |
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225 return _allocated_used_words * BytesPerWord; |
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226 } |
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227 |
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228 static size_t free_bytes(); |
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229 |
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230 // Total capacity in all Metaspaces |
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231 static size_t capacity_bytes_slow() { |
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232 #ifdef PRODUCT |
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233 // Use allocated_capacity_bytes() in PRODUCT instead of this function. |
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234 guarantee(false, "Should not call capacity_bytes_slow() in the PRODUCT"); |
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235 #endif |
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236 size_t class_capacity = capacity_bytes_slow(Metaspace::ClassType); |
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237 size_t non_class_capacity = capacity_bytes_slow(Metaspace::NonClassType); |
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238 assert(allocated_capacity_bytes() == class_capacity + non_class_capacity, |
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239 err_msg("bad accounting: allocated_capacity_bytes() " SIZE_FORMAT |
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240 " class_capacity + non_class_capacity " SIZE_FORMAT |
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241 " class_capacity " SIZE_FORMAT " non_class_capacity " SIZE_FORMAT, |
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242 allocated_capacity_bytes(), class_capacity + non_class_capacity, |
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243 class_capacity, non_class_capacity)); |
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244 |
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245 return class_capacity + non_class_capacity; |
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246 } |
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247 |
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248 // Total space reserved in all Metaspaces |
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249 static size_t reserved_in_bytes() { |
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250 return reserved_in_bytes(Metaspace::ClassType) + |
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251 reserved_in_bytes(Metaspace::NonClassType); |
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252 } |
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253 |
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254 static size_t min_chunk_size(); |
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255 |
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256 // Print change in used metadata. |
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257 static void print_metaspace_change(size_t prev_metadata_used); |
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258 static void print_on(outputStream * out); |
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259 static void print_on(outputStream * out, Metaspace::MetadataType mdtype); |
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260 |
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261 static void print_waste(outputStream* out); |
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262 static void dump(outputStream* out); |
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263 static void verify_free_chunks(); |
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264 // Checks that the values returned by allocated_capacity_bytes() and |
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265 // capacity_bytes_slow() are the same. |
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266 static void verify_capacity(); |
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267 static void verify_used(); |
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268 static void verify_metrics(); |
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269 }; |
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270 |
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271 // Metaspace are deallocated when their class loader are GC'ed. |
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272 // This class implements a policy for inducing GC's to recover |
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273 // Metaspaces. |
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274 |
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275 class MetaspaceGC : AllStatic { |
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276 |
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277 // The current high-water-mark for inducing a GC. When |
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278 // the capacity of all space in the virtual lists reaches this value, |
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279 // a GC is induced and the value is increased. This should be changed |
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280 // to the space actually used for allocations to avoid affects of |
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281 // fragmentation losses to partially used chunks. Size is in words. |
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282 static size_t _capacity_until_GC; |
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283 |
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284 // After a GC is done any allocation that fails should try to expand |
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285 // the capacity of the Metaspaces. This flag is set during attempts |
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286 // to allocate in the VMGCOperation that does the GC. |
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287 static bool _expand_after_GC; |
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288 |
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289 // For a CMS collection, signal that a concurrent collection should |
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290 // be started. |
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291 static bool _should_concurrent_collect; |
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292 |
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293 static uint _shrink_factor; |
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294 |
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295 static void set_capacity_until_GC(size_t v) { _capacity_until_GC = v; } |
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296 |
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297 static size_t shrink_factor() { return _shrink_factor; } |
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298 void set_shrink_factor(uint v) { _shrink_factor = v; } |
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299 |
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300 public: |
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301 |
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302 static size_t capacity_until_GC() { return _capacity_until_GC; } |
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303 static void inc_capacity_until_GC(size_t v) { _capacity_until_GC += v; } |
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304 static void dec_capacity_until_GC(size_t v) { |
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305 _capacity_until_GC = _capacity_until_GC > v ? _capacity_until_GC - v : 0; |
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306 } |
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307 static bool expand_after_GC() { return _expand_after_GC; } |
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308 static void set_expand_after_GC(bool v) { _expand_after_GC = v; } |
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309 |
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310 static bool should_concurrent_collect() { return _should_concurrent_collect; } |
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311 static void set_should_concurrent_collect(bool v) { |
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312 _should_concurrent_collect = v; |
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313 } |
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314 |
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315 // The amount to increase the high-water-mark (_capacity_until_GC) |
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316 static size_t delta_capacity_until_GC(size_t word_size); |
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317 |
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318 // It is expected that this will be called when the current capacity |
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319 // has been used and a GC should be considered. |
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320 static bool should_expand(VirtualSpaceList* vsl, size_t word_size); |
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321 |
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322 // Calculate the new high-water mark at which to induce |
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323 // a GC. |
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324 static void compute_new_size(); |
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325 }; |
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326 |
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327 #endif // SHARE_VM_MEMORY_METASPACE_HPP |