Mercurial > hg > graal-compiler
annotate src/share/vm/memory/metaspace.hpp @ 14313:44315152d434
8028391: Make the Min/MaxHeapFreeRatio flags manageable
Summary: Made the flags Min- and MaxHeapFreeRatio manageable, and implemented support for these flags in ParallalGC.
Reviewed-by: sla, mgerdin, brutisso
author | jwilhelm |
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date | Wed, 29 Jan 2014 23:17:05 +0100 |
parents | ce86c36b8921 |
children | abec000618bf daef39043d2c |
rev | line source |
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1 /* |
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2 * Copyright (c) 2011, 2013, 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 ChunkManager; |
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60 class ClassLoaderData; |
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62 class Metachunk; |
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63 class MetaWord; |
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64 class Mutex; |
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65 class outputStream; |
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66 class SpaceManager; |
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67 class VirtualSpaceList; |
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68 |
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69 // Metaspaces each have a SpaceManager and allocations |
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70 // are done by the SpaceManager. Allocations are done |
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71 // out of the current Metachunk. When the current Metachunk |
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72 // is exhausted, the SpaceManager gets a new one from |
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73 // the current VirtualSpace. When the VirtualSpace is exhausted |
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74 // the SpaceManager gets a new one. The SpaceManager |
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75 // also manages freelists of available Chunks. |
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76 // |
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77 // Currently the space manager maintains the list of |
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78 // virtual spaces and the list of chunks in use. Its |
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79 // allocate() method returns a block for use as a |
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80 // quantum of metadata. |
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81 |
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82 class Metaspace : public CHeapObj<mtClass> { |
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83 friend class VMStructs; |
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84 friend class SpaceManager; |
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85 friend class VM_CollectForMetadataAllocation; |
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86 friend class MetaspaceGC; |
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87 friend class MetaspaceAux; |
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88 |
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89 public: |
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90 enum MetadataType { |
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91 ClassType, |
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92 NonClassType, |
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93 MetadataTypeCount |
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94 }; |
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95 enum MetaspaceType { |
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96 StandardMetaspaceType, |
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97 BootMetaspaceType, |
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98 ROMetaspaceType, |
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99 ReadWriteMetaspaceType, |
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100 AnonymousMetaspaceType, |
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101 ReflectionMetaspaceType |
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102 }; |
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103 |
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104 private: |
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105 void initialize(Mutex* lock, MetaspaceType type); |
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106 |
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107 // Get the first chunk for a Metaspace. Used for |
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108 // special cases such as the boot class loader, reflection |
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109 // class loader and anonymous class loader. |
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110 Metachunk* get_initialization_chunk(MetadataType mdtype, |
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111 size_t chunk_word_size, |
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112 size_t chunk_bunch); |
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113 |
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114 // Align up the word size to the allocation word size |
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115 static size_t align_word_size_up(size_t); |
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116 |
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117 // Aligned size of the metaspace. |
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118 static size_t _compressed_class_space_size; |
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119 |
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120 static size_t compressed_class_space_size() { |
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121 return _compressed_class_space_size; |
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122 } |
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123 static void set_compressed_class_space_size(size_t size) { |
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124 _compressed_class_space_size = size; |
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125 } |
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126 |
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127 static size_t _first_chunk_word_size; |
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128 static size_t _first_class_chunk_word_size; |
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129 |
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130 static size_t _commit_alignment; |
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131 static size_t _reserve_alignment; |
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132 |
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133 SpaceManager* _vsm; |
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134 SpaceManager* vsm() const { return _vsm; } |
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135 |
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136 SpaceManager* _class_vsm; |
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137 SpaceManager* class_vsm() const { return _class_vsm; } |
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138 |
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139 // Allocate space for metadata of type mdtype. This is space |
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140 // within a Metachunk and is used by |
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141 // allocate(ClassLoaderData*, size_t, bool, MetadataType, TRAPS) |
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142 MetaWord* allocate(size_t word_size, MetadataType mdtype); |
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143 |
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144 // Virtual Space lists for both classes and other metadata |
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145 static VirtualSpaceList* _space_list; |
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146 static VirtualSpaceList* _class_space_list; |
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147 |
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148 static ChunkManager* _chunk_manager_metadata; |
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149 static ChunkManager* _chunk_manager_class; |
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150 |
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151 public: |
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152 static VirtualSpaceList* space_list() { return _space_list; } |
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153 static VirtualSpaceList* class_space_list() { return _class_space_list; } |
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154 static VirtualSpaceList* get_space_list(MetadataType mdtype) { |
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155 assert(mdtype != MetadataTypeCount, "MetadaTypeCount can't be used as mdtype"); |
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156 return mdtype == ClassType ? class_space_list() : space_list(); |
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157 } |
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158 |
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159 static ChunkManager* chunk_manager_metadata() { return _chunk_manager_metadata; } |
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160 static ChunkManager* chunk_manager_class() { return _chunk_manager_class; } |
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161 static ChunkManager* get_chunk_manager(MetadataType mdtype) { |
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162 assert(mdtype != MetadataTypeCount, "MetadaTypeCount can't be used as mdtype"); |
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163 return mdtype == ClassType ? chunk_manager_class() : chunk_manager_metadata(); |
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164 } |
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165 |
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166 private: |
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167 // This is used by DumpSharedSpaces only, where only _vsm is used. So we will |
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168 // maintain a single list for now. |
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169 void record_allocation(void* ptr, MetaspaceObj::Type type, size_t word_size); |
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170 |
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171 #ifdef _LP64 |
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172 static void set_narrow_klass_base_and_shift(address metaspace_base, address cds_base); |
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173 |
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174 // Returns true if can use CDS with metaspace allocated as specified address. |
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175 static bool can_use_cds_with_metaspace_addr(char* metaspace_base, address cds_base); |
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176 |
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177 static void allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base); |
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178 |
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179 static void initialize_class_space(ReservedSpace rs); |
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180 #endif |
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181 |
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182 class AllocRecord : public CHeapObj<mtClass> { |
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183 public: |
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184 AllocRecord(address ptr, MetaspaceObj::Type type, int byte_size) |
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185 : _next(NULL), _ptr(ptr), _type(type), _byte_size(byte_size) {} |
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186 AllocRecord *_next; |
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187 address _ptr; |
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188 MetaspaceObj::Type _type; |
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189 int _byte_size; |
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190 }; |
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191 |
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192 AllocRecord * _alloc_record_head; |
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193 AllocRecord * _alloc_record_tail; |
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194 |
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195 size_t class_chunk_size(size_t word_size); |
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196 |
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197 public: |
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198 |
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199 Metaspace(Mutex* lock, MetaspaceType type); |
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200 ~Metaspace(); |
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201 |
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202 static void ergo_initialize(); |
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203 static void global_initialize(); |
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204 |
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205 static size_t first_chunk_word_size() { return _first_chunk_word_size; } |
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206 static size_t first_class_chunk_word_size() { return _first_class_chunk_word_size; } |
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207 |
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208 static size_t reserve_alignment() { return _reserve_alignment; } |
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209 static size_t reserve_alignment_words() { return _reserve_alignment / BytesPerWord; } |
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210 static size_t commit_alignment() { return _commit_alignment; } |
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211 static size_t commit_alignment_words() { return _commit_alignment / BytesPerWord; } |
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212 |
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213 char* bottom() const; |
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214 size_t used_words_slow(MetadataType mdtype) const; |
12235 | 215 size_t free_words_slow(MetadataType mdtype) const; |
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216 size_t capacity_words_slow(MetadataType mdtype) const; |
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217 |
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218 size_t used_bytes_slow(MetadataType mdtype) const; |
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219 size_t capacity_bytes_slow(MetadataType mdtype) const; |
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220 |
12902 | 221 static MetaWord* allocate(ClassLoaderData* loader_data, size_t word_size, |
222 bool read_only, MetaspaceObj::Type type, TRAPS); | |
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223 void deallocate(MetaWord* ptr, size_t byte_size, bool is_class); |
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224 |
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225 MetaWord* expand_and_allocate(size_t size, |
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226 MetadataType mdtype); |
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227 |
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228 bool contains(const void* ptr); |
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229 void dump(outputStream* const out) const; |
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230 |
10175 | 231 // Free empty virtualspaces |
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232 static void purge(MetadataType mdtype); |
10175 | 233 static void purge(); |
234 | |
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235 static void report_metadata_oome(ClassLoaderData* loader_data, size_t word_size, |
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236 MetadataType mdtype, TRAPS); |
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237 |
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238 void print_on(outputStream* st) const; |
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239 // Debugging support |
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240 void verify(); |
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241 |
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242 class AllocRecordClosure : public StackObj { |
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243 public: |
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244 virtual void doit(address ptr, MetaspaceObj::Type type, int byte_size) = 0; |
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245 }; |
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246 |
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247 void iterate(AllocRecordClosure *closure); |
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248 |
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249 // Return TRUE only if UseCompressedClassPointers is True and DumpSharedSpaces is False. |
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250 static bool using_class_space() { |
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251 return NOT_LP64(false) LP64_ONLY(UseCompressedClassPointers && !DumpSharedSpaces); |
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252 } |
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253 |
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254 static bool is_class_space_allocation(MetadataType mdType) { |
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255 return mdType == ClassType && using_class_space(); |
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256 } |
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257 |
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258 }; |
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259 |
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260 class MetaspaceAux : AllStatic { |
12235 | 261 static size_t free_chunks_total_words(Metaspace::MetadataType mdtype); |
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262 |
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263 // These methods iterate over the classloader data graph |
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264 // for the given Metaspace type. These are slow. |
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265 static size_t used_bytes_slow(Metaspace::MetadataType mdtype); |
12235 | 266 static size_t free_bytes_slow(Metaspace::MetadataType mdtype); |
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267 static size_t capacity_bytes_slow(Metaspace::MetadataType mdtype); |
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269 |
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270 // Running sum of space in all Metachunks that has been |
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271 // allocated to a Metaspace. This is used instead of |
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272 // iterating over all the classloaders. One for each |
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273 // type of Metadata |
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274 static size_t _allocated_capacity_words[Metaspace:: MetadataTypeCount]; |
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275 // Running sum of space in all Metachunks that have |
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276 // are being used for metadata. One for each |
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277 // type of Metadata. |
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278 static size_t _allocated_used_words[Metaspace:: MetadataTypeCount]; |
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279 |
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280 public: |
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281 // Decrement and increment _allocated_capacity_words |
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282 static void dec_capacity(Metaspace::MetadataType type, size_t words); |
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283 static void inc_capacity(Metaspace::MetadataType type, size_t words); |
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284 |
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285 // Decrement and increment _allocated_used_words |
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286 static void dec_used(Metaspace::MetadataType type, size_t words); |
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287 static void inc_used(Metaspace::MetadataType type, size_t words); |
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288 |
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289 // Total of space allocated to metadata in all Metaspaces. |
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290 // This sums the space used in each Metachunk by |
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291 // iterating over the classloader data graph |
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292 static size_t used_bytes_slow() { |
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293 return used_bytes_slow(Metaspace::ClassType) + |
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294 used_bytes_slow(Metaspace::NonClassType); |
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295 } |
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296 |
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297 // Used by MetaspaceCounters |
12235 | 298 static size_t free_chunks_total_words(); |
299 static size_t free_chunks_total_bytes(); | |
300 static size_t free_chunks_total_bytes(Metaspace::MetadataType mdtype); | |
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301 |
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302 static size_t allocated_capacity_words(Metaspace::MetadataType mdtype) { |
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303 return _allocated_capacity_words[mdtype]; |
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304 } |
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305 static size_t allocated_capacity_words() { |
12235 | 306 return allocated_capacity_words(Metaspace::NonClassType) + |
307 allocated_capacity_words(Metaspace::ClassType); | |
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308 } |
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309 static size_t allocated_capacity_bytes(Metaspace::MetadataType mdtype) { |
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310 return allocated_capacity_words(mdtype) * BytesPerWord; |
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311 } |
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312 static size_t allocated_capacity_bytes() { |
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313 return allocated_capacity_words() * BytesPerWord; |
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314 } |
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315 |
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316 static size_t allocated_used_words(Metaspace::MetadataType mdtype) { |
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317 return _allocated_used_words[mdtype]; |
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318 } |
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319 static size_t allocated_used_words() { |
12235 | 320 return allocated_used_words(Metaspace::NonClassType) + |
321 allocated_used_words(Metaspace::ClassType); | |
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322 } |
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323 static size_t allocated_used_bytes(Metaspace::MetadataType mdtype) { |
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324 return allocated_used_words(mdtype) * BytesPerWord; |
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325 } |
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326 static size_t allocated_used_bytes() { |
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327 return allocated_used_words() * BytesPerWord; |
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328 } |
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329 |
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330 static size_t free_bytes(); |
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331 static size_t free_bytes(Metaspace::MetadataType mdtype); |
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332 |
12235 | 333 static size_t reserved_bytes(Metaspace::MetadataType mdtype); |
334 static size_t reserved_bytes() { | |
335 return reserved_bytes(Metaspace::ClassType) + | |
336 reserved_bytes(Metaspace::NonClassType); | |
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337 } |
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338 |
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339 static size_t committed_bytes(Metaspace::MetadataType mdtype); |
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340 static size_t committed_bytes() { |
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341 return committed_bytes(Metaspace::ClassType) + |
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342 committed_bytes(Metaspace::NonClassType); |
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343 } |
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344 |
12235 | 345 static size_t min_chunk_size_words(); |
346 static size_t min_chunk_size_bytes() { | |
347 return min_chunk_size_words() * BytesPerWord; | |
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348 } |
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349 |
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350 // Print change in used metadata. |
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351 static void print_metaspace_change(size_t prev_metadata_used); |
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352 static void print_on(outputStream * out); |
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353 static void print_on(outputStream * out, Metaspace::MetadataType mdtype); |
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354 |
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355 static void print_class_waste(outputStream* out); |
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356 static void print_waste(outputStream* out); |
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357 static void dump(outputStream* out); |
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358 static void verify_free_chunks(); |
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359 // Checks that the values returned by allocated_capacity_bytes() and |
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360 // capacity_bytes_slow() are the same. |
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361 static void verify_capacity(); |
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362 static void verify_used(); |
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363 static void verify_metrics(); |
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364 }; |
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365 |
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366 // Metaspace are deallocated when their class loader are GC'ed. |
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367 // This class implements a policy for inducing GC's to recover |
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368 // Metaspaces. |
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369 |
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370 class MetaspaceGC : AllStatic { |
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371 |
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372 // The current high-water-mark for inducing a GC. |
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373 // When committed memory of all metaspaces reaches this value, |
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374 // a GC is induced and the value is increased. Size is in bytes. |
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375 static volatile intptr_t _capacity_until_GC; |
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376 |
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377 // For a CMS collection, signal that a concurrent collection should |
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378 // be started. |
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379 static bool _should_concurrent_collect; |
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380 |
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381 static uint _shrink_factor; |
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382 |
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383 static size_t shrink_factor() { return _shrink_factor; } |
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384 void set_shrink_factor(uint v) { _shrink_factor = v; } |
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385 |
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386 public: |
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387 |
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388 static void initialize() { _capacity_until_GC = MetaspaceSize; } |
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389 |
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390 static size_t capacity_until_GC(); |
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391 static size_t inc_capacity_until_GC(size_t v); |
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392 static size_t dec_capacity_until_GC(size_t v); |
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393 |
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394 static bool should_concurrent_collect() { return _should_concurrent_collect; } |
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395 static void set_should_concurrent_collect(bool v) { |
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396 _should_concurrent_collect = v; |
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397 } |
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398 |
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399 // The amount to increase the high-water-mark (_capacity_until_GC) |
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400 static size_t delta_capacity_until_GC(size_t bytes); |
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401 |
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402 // Tells if we have can expand metaspace without hitting set limits. |
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403 static bool can_expand(size_t words, bool is_class); |
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404 |
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405 // Returns amount that we can expand without hitting a GC, |
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406 // measured in words. |
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407 static size_t allowed_expansion(); |
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408 |
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409 // Calculate the new high-water mark at which to induce |
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410 // a GC. |
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411 static void compute_new_size(); |
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412 }; |
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413 |
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414 #endif // SHARE_VM_MEMORY_METASPACE_HPP |