Mercurial > hg > truffle
annotate src/share/vm/memory/metaspace.hpp @ 18173:8c079b8d0446
Reduce allocation during scope recording
author | Tom Rodriguez <tom.rodriguez@oracle.com> |
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date | Fri, 24 Oct 2014 12:48:53 -0700 |
parents | 52b4284cb496 |
children | 7848fc12602b |
rev | line source |
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1 /* |
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2 * Copyright (c) 2011, 2014, 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 "memory/metaspaceChunkFreeListSummary.hpp" |
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30 #include "runtime/virtualspace.hpp" |
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31 #include "utilities/exceptions.hpp" |
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32 |
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33 // Metaspace |
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34 // |
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35 // Metaspaces are Arenas for the VM's metadata. |
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36 // They are allocated one per class loader object, and one for the null |
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37 // bootstrap class loader |
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38 // Eventually for bootstrap loader we'll have a read-only section and read-write |
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39 // to write for DumpSharedSpaces and read for UseSharedSpaces |
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40 // |
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41 // block X ---+ +-------------------+ |
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42 // | | Virtualspace | |
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43 // | | | |
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44 // | | | |
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45 // | |-------------------| |
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46 // | || Chunk | |
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47 // | || | |
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48 // | ||---------- | |
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49 // +------>||| block 0 | | |
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50 // ||---------- | |
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51 // ||| block 1 | | |
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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 |
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60 class ChunkManager; |
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61 class ClassLoaderData; |
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63 class Metachunk; |
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64 class MetaspaceTracer; |
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65 class MetaWord; |
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66 class Mutex; |
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67 class outputStream; |
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68 class SpaceManager; |
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69 class VirtualSpaceList; |
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70 |
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71 // Metaspaces each have a SpaceManager and allocations |
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72 // are done by the SpaceManager. Allocations are done |
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73 // out of the current Metachunk. When the current Metachunk |
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74 // is exhausted, the SpaceManager gets a new one from |
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75 // the current VirtualSpace. When the VirtualSpace is exhausted |
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76 // the SpaceManager gets a new one. The SpaceManager |
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77 // also manages freelists of available Chunks. |
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78 // |
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79 // Currently the space manager maintains the list of |
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80 // virtual spaces and the list of chunks in use. Its |
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81 // allocate() method returns a block for use as a |
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82 // quantum of metadata. |
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83 |
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84 class Metaspace : public CHeapObj<mtClass> { |
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85 friend class VMStructs; |
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86 friend class SpaceManager; |
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87 friend class VM_CollectForMetadataAllocation; |
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88 friend class MetaspaceGC; |
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89 friend class MetaspaceAux; |
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90 |
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91 public: |
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92 enum MetadataType { |
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93 ClassType, |
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94 NonClassType, |
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95 MetadataTypeCount |
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96 }; |
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97 enum MetaspaceType { |
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98 StandardMetaspaceType, |
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99 BootMetaspaceType, |
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100 ROMetaspaceType, |
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101 ReadWriteMetaspaceType, |
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102 AnonymousMetaspaceType, |
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103 ReflectionMetaspaceType |
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104 }; |
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105 |
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106 private: |
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107 void initialize(Mutex* lock, MetaspaceType type); |
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108 |
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109 // Get the first chunk for a Metaspace. Used for |
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110 // special cases such as the boot class loader, reflection |
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111 // class loader and anonymous class loader. |
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112 Metachunk* get_initialization_chunk(MetadataType mdtype, |
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113 size_t chunk_word_size, |
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114 size_t chunk_bunch); |
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115 |
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116 // Align up the word size to the allocation word size |
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117 static size_t align_word_size_up(size_t); |
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118 |
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119 // Aligned size of the metaspace. |
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120 static size_t _compressed_class_space_size; |
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121 |
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122 static size_t compressed_class_space_size() { |
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123 return _compressed_class_space_size; |
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124 } |
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125 |
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126 static void set_compressed_class_space_size(size_t size) { |
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127 _compressed_class_space_size = size; |
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128 } |
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129 |
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130 static size_t _first_chunk_word_size; |
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131 static size_t _first_class_chunk_word_size; |
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132 |
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133 static size_t _commit_alignment; |
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134 static size_t _reserve_alignment; |
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135 |
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136 SpaceManager* _vsm; |
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137 SpaceManager* vsm() const { return _vsm; } |
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138 |
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139 SpaceManager* _class_vsm; |
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140 SpaceManager* class_vsm() const { return _class_vsm; } |
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141 |
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142 // Allocate space for metadata of type mdtype. This is space |
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143 // within a Metachunk and is used by |
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144 // allocate(ClassLoaderData*, size_t, bool, MetadataType, TRAPS) |
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145 MetaWord* allocate(size_t word_size, MetadataType mdtype); |
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146 |
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147 // Virtual Space lists for both classes and other metadata |
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148 static VirtualSpaceList* _space_list; |
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149 static VirtualSpaceList* _class_space_list; |
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150 |
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151 static ChunkManager* _chunk_manager_metadata; |
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152 static ChunkManager* _chunk_manager_class; |
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153 |
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154 static const MetaspaceTracer* _tracer; |
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155 |
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156 public: |
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157 static VirtualSpaceList* space_list() { return _space_list; } |
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158 static VirtualSpaceList* class_space_list() { return _class_space_list; } |
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159 static VirtualSpaceList* get_space_list(MetadataType mdtype) { |
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160 assert(mdtype != MetadataTypeCount, "MetadaTypeCount can't be used as mdtype"); |
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161 return mdtype == ClassType ? class_space_list() : space_list(); |
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162 } |
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163 |
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164 static ChunkManager* chunk_manager_metadata() { return _chunk_manager_metadata; } |
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165 static ChunkManager* chunk_manager_class() { return _chunk_manager_class; } |
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166 static ChunkManager* get_chunk_manager(MetadataType mdtype) { |
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167 assert(mdtype != MetadataTypeCount, "MetadaTypeCount can't be used as mdtype"); |
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168 return mdtype == ClassType ? chunk_manager_class() : chunk_manager_metadata(); |
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169 } |
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170 |
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171 static const MetaspaceTracer* tracer() { return _tracer; } |
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172 |
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173 private: |
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174 // This is used by DumpSharedSpaces only, where only _vsm is used. So we will |
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175 // maintain a single list for now. |
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176 void record_allocation(void* ptr, MetaspaceObj::Type type, size_t word_size); |
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177 |
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178 #ifdef _LP64 |
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179 static void set_narrow_klass_base_and_shift(address metaspace_base, address cds_base); |
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180 |
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181 // Returns true if can use CDS with metaspace allocated as specified address. |
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182 static bool can_use_cds_with_metaspace_addr(char* metaspace_base, address cds_base); |
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183 |
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184 static void allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base); |
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185 |
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186 static void initialize_class_space(ReservedSpace rs); |
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187 #endif |
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188 |
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189 class AllocRecord : public CHeapObj<mtClass> { |
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190 public: |
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191 AllocRecord(address ptr, MetaspaceObj::Type type, int byte_size) |
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192 : _next(NULL), _ptr(ptr), _type(type), _byte_size(byte_size) {} |
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193 AllocRecord *_next; |
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194 address _ptr; |
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195 MetaspaceObj::Type _type; |
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196 int _byte_size; |
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197 }; |
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198 |
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199 AllocRecord * _alloc_record_head; |
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200 AllocRecord * _alloc_record_tail; |
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201 |
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202 size_t class_chunk_size(size_t word_size); |
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203 |
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204 public: |
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205 |
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206 Metaspace(Mutex* lock, MetaspaceType type); |
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207 ~Metaspace(); |
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208 |
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209 static void ergo_initialize(); |
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210 static void global_initialize(); |
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211 static void post_initialize(); |
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212 |
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213 static size_t first_chunk_word_size() { return _first_chunk_word_size; } |
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214 static size_t first_class_chunk_word_size() { return _first_class_chunk_word_size; } |
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215 |
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216 static size_t reserve_alignment() { return _reserve_alignment; } |
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217 static size_t reserve_alignment_words() { return _reserve_alignment / BytesPerWord; } |
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218 static size_t commit_alignment() { return _commit_alignment; } |
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219 static size_t commit_alignment_words() { return _commit_alignment / BytesPerWord; } |
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220 |
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221 char* bottom() const; |
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222 size_t used_words_slow(MetadataType mdtype) const; |
12235 | 223 size_t free_words_slow(MetadataType mdtype) const; |
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224 size_t capacity_words_slow(MetadataType mdtype) const; |
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225 |
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226 size_t used_bytes_slow(MetadataType mdtype) const; |
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227 size_t capacity_bytes_slow(MetadataType mdtype) const; |
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228 |
12902 | 229 static MetaWord* allocate(ClassLoaderData* loader_data, size_t word_size, |
230 bool read_only, MetaspaceObj::Type type, TRAPS); | |
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231 void deallocate(MetaWord* ptr, size_t byte_size, bool is_class); |
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232 |
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233 MetaWord* expand_and_allocate(size_t size, |
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234 MetadataType mdtype); |
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235 |
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236 static bool contains(const void* ptr); |
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237 |
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238 void dump(outputStream* const out) const; |
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239 |
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241 static void purge(MetadataType mdtype); |
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243 | |
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244 static void report_metadata_oome(ClassLoaderData* loader_data, size_t word_size, |
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245 MetaspaceObj::Type type, MetadataType mdtype, TRAPS); |
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246 |
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247 static const char* metadata_type_name(Metaspace::MetadataType mdtype); |
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248 |
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249 void print_on(outputStream* st) const; |
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250 // Debugging support |
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251 void verify(); |
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252 |
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253 class AllocRecordClosure : public StackObj { |
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254 public: |
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255 virtual void doit(address ptr, MetaspaceObj::Type type, int byte_size) = 0; |
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256 }; |
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257 |
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258 void iterate(AllocRecordClosure *closure); |
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259 |
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260 // Return TRUE only if UseCompressedClassPointers is True and DumpSharedSpaces is False. |
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261 static bool using_class_space() { |
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262 return NOT_LP64(false) LP64_ONLY(UseCompressedClassPointers && !DumpSharedSpaces); |
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263 } |
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264 |
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265 static bool is_class_space_allocation(MetadataType mdType) { |
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266 return mdType == ClassType && using_class_space(); |
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267 } |
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268 |
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269 }; |
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270 |
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271 class MetaspaceAux : AllStatic { |
12235 | 272 static size_t free_chunks_total_words(Metaspace::MetadataType mdtype); |
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273 |
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274 // These methods iterate over the classloader data graph |
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275 // for the given Metaspace type. These are slow. |
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276 static size_t used_bytes_slow(Metaspace::MetadataType mdtype); |
12235 | 277 static size_t free_bytes_slow(Metaspace::MetadataType mdtype); |
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278 static size_t capacity_bytes_slow(Metaspace::MetadataType mdtype); |
12235 | 279 static size_t capacity_bytes_slow(); |
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280 |
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281 // Running sum of space in all Metachunks that has been |
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282 // allocated to a Metaspace. This is used instead of |
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283 // iterating over all the classloaders. One for each |
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284 // type of Metadata |
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285 static size_t _capacity_words[Metaspace:: MetadataTypeCount]; |
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286 // Running sum of space in all Metachunks that |
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287 // are being used for metadata. One for each |
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288 // type of Metadata. |
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289 static size_t _used_words[Metaspace:: MetadataTypeCount]; |
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290 |
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291 public: |
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292 // Decrement and increment _allocated_capacity_words |
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293 static void dec_capacity(Metaspace::MetadataType type, size_t words); |
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294 static void inc_capacity(Metaspace::MetadataType type, size_t words); |
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295 |
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296 // Decrement and increment _allocated_used_words |
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297 static void dec_used(Metaspace::MetadataType type, size_t words); |
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298 static void inc_used(Metaspace::MetadataType type, size_t words); |
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299 |
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300 // Total of space allocated to metadata in all Metaspaces. |
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301 // This sums the space used in each Metachunk by |
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302 // iterating over the classloader data graph |
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303 static size_t used_bytes_slow() { |
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304 return used_bytes_slow(Metaspace::ClassType) + |
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305 used_bytes_slow(Metaspace::NonClassType); |
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306 } |
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307 |
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308 // Used by MetaspaceCounters |
12235 | 309 static size_t free_chunks_total_words(); |
310 static size_t free_chunks_total_bytes(); | |
311 static size_t free_chunks_total_bytes(Metaspace::MetadataType mdtype); | |
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312 |
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313 static size_t capacity_words(Metaspace::MetadataType mdtype) { |
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314 return _capacity_words[mdtype]; |
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315 } |
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316 static size_t capacity_words() { |
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317 return capacity_words(Metaspace::NonClassType) + |
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318 capacity_words(Metaspace::ClassType); |
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319 } |
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320 static size_t capacity_bytes(Metaspace::MetadataType mdtype) { |
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321 return capacity_words(mdtype) * BytesPerWord; |
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322 } |
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323 static size_t capacity_bytes() { |
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324 return capacity_words() * BytesPerWord; |
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325 } |
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326 |
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327 static size_t used_words(Metaspace::MetadataType mdtype) { |
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328 return _used_words[mdtype]; |
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329 } |
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330 static size_t used_words() { |
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331 return used_words(Metaspace::NonClassType) + |
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332 used_words(Metaspace::ClassType); |
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333 } |
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334 static size_t used_bytes(Metaspace::MetadataType mdtype) { |
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335 return used_words(mdtype) * BytesPerWord; |
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336 } |
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337 static size_t used_bytes() { |
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338 return used_words() * BytesPerWord; |
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339 } |
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340 |
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341 static size_t free_bytes(); |
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342 static size_t free_bytes(Metaspace::MetadataType mdtype); |
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343 |
12235 | 344 static size_t reserved_bytes(Metaspace::MetadataType mdtype); |
345 static size_t reserved_bytes() { | |
346 return reserved_bytes(Metaspace::ClassType) + | |
347 reserved_bytes(Metaspace::NonClassType); | |
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348 } |
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349 |
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350 static size_t committed_bytes(Metaspace::MetadataType mdtype); |
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351 static size_t committed_bytes() { |
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352 return committed_bytes(Metaspace::ClassType) + |
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353 committed_bytes(Metaspace::NonClassType); |
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354 } |
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355 |
12235 | 356 static size_t min_chunk_size_words(); |
357 static size_t min_chunk_size_bytes() { | |
358 return min_chunk_size_words() * BytesPerWord; | |
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359 } |
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360 |
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361 static bool has_chunk_free_list(Metaspace::MetadataType mdtype); |
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362 static MetaspaceChunkFreeListSummary chunk_free_list_summary(Metaspace::MetadataType mdtype); |
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363 |
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364 // Print change in used metadata. |
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365 static void print_metaspace_change(size_t prev_metadata_used); |
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366 static void print_on(outputStream * out); |
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367 static void print_on(outputStream * out, Metaspace::MetadataType mdtype); |
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368 |
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369 static void print_class_waste(outputStream* out); |
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370 static void print_waste(outputStream* out); |
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371 static void dump(outputStream* out); |
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372 static void verify_free_chunks(); |
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373 // Checks that the values returned by allocated_capacity_bytes() and |
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374 // capacity_bytes_slow() are the same. |
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375 static void verify_capacity(); |
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376 static void verify_used(); |
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377 static void verify_metrics(); |
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378 }; |
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379 |
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380 // Metaspace are deallocated when their class loader are GC'ed. |
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381 // This class implements a policy for inducing GC's to recover |
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382 // Metaspaces. |
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383 |
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384 class MetaspaceGC : AllStatic { |
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385 |
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386 // The current high-water-mark for inducing a GC. |
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387 // When committed memory of all metaspaces reaches this value, |
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388 // a GC is induced and the value is increased. Size is in bytes. |
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389 static volatile intptr_t _capacity_until_GC; |
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390 |
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391 // For a CMS collection, signal that a concurrent collection should |
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392 // be started. |
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393 static bool _should_concurrent_collect; |
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394 |
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395 static uint _shrink_factor; |
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396 |
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397 static size_t shrink_factor() { return _shrink_factor; } |
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398 void set_shrink_factor(uint v) { _shrink_factor = v; } |
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399 |
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400 public: |
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401 |
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402 static void initialize(); |
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403 static void post_initialize(); |
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404 |
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405 static size_t capacity_until_GC(); |
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406 static size_t inc_capacity_until_GC(size_t v); |
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407 static size_t dec_capacity_until_GC(size_t v); |
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408 |
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409 static bool should_concurrent_collect() { return _should_concurrent_collect; } |
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410 static void set_should_concurrent_collect(bool v) { |
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411 _should_concurrent_collect = v; |
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412 } |
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413 |
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414 // The amount to increase the high-water-mark (_capacity_until_GC) |
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415 static size_t delta_capacity_until_GC(size_t bytes); |
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416 |
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417 // Tells if we have can expand metaspace without hitting set limits. |
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418 static bool can_expand(size_t words, bool is_class); |
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419 |
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420 // Returns amount that we can expand without hitting a GC, |
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421 // measured in words. |
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422 static size_t allowed_expansion(); |
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423 |
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424 // Calculate the new high-water mark at which to induce |
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425 // a GC. |
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426 static void compute_new_size(); |
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427 }; |
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428 |
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429 #endif // SHARE_VM_MEMORY_METASPACE_HPP |