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annotate src/share/vm/memory/metaspace.hpp @ 8804:91bf0bdae37b

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8008217: CDS: Class data sharing limits the malloc heap on Solaris Summary: In 64bit VM move CDS archive address to 32G on all platforms using new flag SharedBaseAddress. In 32bit VM set CDS archive address to 3Gb on Linux and let other OSs pick the address. Reviewed-by: kvn, dcubed, zgu, hseigel
author coleenp
date Wed, 20 Mar 2013 08:04:54 -0400
parents e51c9860cf66
children dbd5837b342f
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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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60 class Metablock;
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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 MetaWord* allocate(size_t word_size, MetadataType mdtype);
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115
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116 // Virtual Space lists for both classes and other metadata
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117 static VirtualSpaceList* _space_list;
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118 static VirtualSpaceList* _class_space_list;
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119
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120 static VirtualSpaceList* space_list() { return _space_list; }
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121 static VirtualSpaceList* class_space_list() { return _class_space_list; }
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122
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123 public:
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124
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125 Metaspace(Mutex* lock, MetaspaceType type);
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126 ~Metaspace();
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127
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128 // Initialize globals for Metaspace
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129 static void global_initialize();
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130 static void initialize_class_space(ReservedSpace rs);
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131
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132 static size_t first_chunk_word_size() { return _first_chunk_word_size; }
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133 static size_t first_class_chunk_word_size() { return _first_class_chunk_word_size; }
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134
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135 char* bottom() const;
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136 size_t used_words(MetadataType mdtype) const;
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137 size_t free_words(MetadataType mdtype) const;
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138 size_t capacity_words(MetadataType mdtype) const;
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139 size_t waste_words(MetadataType mdtype) const;
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140
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141 static Metablock* allocate(ClassLoaderData* loader_data, size_t size,
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142 bool read_only, MetadataType mdtype, TRAPS);
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143 void deallocate(MetaWord* ptr, size_t byte_size, bool is_class);
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144
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145 MetaWord* expand_and_allocate(size_t size,
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146 MetadataType mdtype);
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147
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148 static bool is_initialized() { return _class_space_list != NULL; }
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149
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150 static bool contains(const void *ptr);
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151 void dump(outputStream* const out) const;
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152
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153 void print_on(outputStream* st) const;
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154 // Debugging support
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155 void verify();
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156 };
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157
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158 class MetaspaceAux : AllStatic {
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159
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160 // Statistics for class space and data space in metaspace.
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161 static size_t used_in_bytes(Metaspace::MetadataType mdtype);
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162 static size_t free_in_bytes(Metaspace::MetadataType mdtype);
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163 static size_t capacity_in_bytes(Metaspace::MetadataType mdtype);
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164 static size_t reserved_in_bytes(Metaspace::MetadataType mdtype);
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165
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166 static size_t free_chunks_total(Metaspace::MetadataType mdtype);
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167 static size_t free_chunks_total_in_bytes(Metaspace::MetadataType mdtype);
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168
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169 public:
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170 // Total of space allocated to metadata in all Metaspaces
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171 static size_t used_in_bytes() {
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172 return used_in_bytes(Metaspace::ClassType) +
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173 used_in_bytes(Metaspace::NonClassType);
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174 }
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175
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176 // Total of available space in all Metaspaces
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177 // Total of capacity allocated to all Metaspaces. This includes
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178 // space in Metachunks not yet allocated and in the Metachunk
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179 // freelist.
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180 static size_t capacity_in_bytes() {
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181 return capacity_in_bytes(Metaspace::ClassType) +
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182 capacity_in_bytes(Metaspace::NonClassType);
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183 }
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184
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185 // Total space reserved in all Metaspaces
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186 static size_t reserved_in_bytes() {
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187 return reserved_in_bytes(Metaspace::ClassType) +
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188 reserved_in_bytes(Metaspace::NonClassType);
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189 }
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190
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191 static size_t min_chunk_size();
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192
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193 // Print change in used metadata.
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194 static void print_metaspace_change(size_t prev_metadata_used);
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195 static void print_on(outputStream * out);
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196 static void print_on(outputStream * out, Metaspace::MetadataType mdtype);
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197
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198 static void print_waste(outputStream* out);
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199 static void dump(outputStream* out);
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200 static void verify_free_chunks();
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201 };
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202
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203 // Metaspace are deallocated when their class loader are GC'ed.
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204 // This class implements a policy for inducing GC's to recover
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205 // Metaspaces.
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206
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207 class MetaspaceGC : AllStatic {
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208
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209 // The current high-water-mark for inducing a GC. When
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210 // the capacity of all space in the virtual lists reaches this value,
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211 // a GC is induced and the value is increased. This should be changed
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212 // to the space actually used for allocations to avoid affects of
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213 // fragmentation losses to partially used chunks. Size is in words.
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214 static size_t _capacity_until_GC;
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215
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216 // After a GC is done any allocation that fails should try to expand
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217 // the capacity of the Metaspaces. This flag is set during attempts
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218 // to allocate in the VMGCOperation that does the GC.
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219 static bool _expand_after_GC;
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220
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221 // For a CMS collection, signal that a concurrent collection should
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222 // be started.
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223 static bool _should_concurrent_collect;
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224
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225 static uint _shrink_factor;
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226
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227 static void set_capacity_until_GC(size_t v) { _capacity_until_GC = v; }
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228
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229 static size_t shrink_factor() { return _shrink_factor; }
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230 void set_shrink_factor(uint v) { _shrink_factor = v; }
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231
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232 public:
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233
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234 static size_t capacity_until_GC() { return _capacity_until_GC; }
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235 static size_t capacity_until_GC_in_bytes() { return _capacity_until_GC * BytesPerWord; }
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236 static void inc_capacity_until_GC(size_t v) { _capacity_until_GC += v; }
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237 static void dec_capacity_until_GC(size_t v) {
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238 _capacity_until_GC = _capacity_until_GC > v ? _capacity_until_GC - v : 0;
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239 }
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240 static bool expand_after_GC() { return _expand_after_GC; }
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241 static void set_expand_after_GC(bool v) { _expand_after_GC = v; }
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242
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243 static bool should_concurrent_collect() { return _should_concurrent_collect; }
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244 static void set_should_concurrent_collect(bool v) {
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245 _should_concurrent_collect = v;
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246 }
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247
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248 // The amount to increase the high-water-mark (_capacity_until_GC)
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249 static size_t delta_capacity_until_GC(size_t word_size);
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250
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251 // It is expected that this will be called when the current capacity
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252 // has been used and a GC should be considered.
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253 static bool should_expand(VirtualSpaceList* vsl, size_t word_size);
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254
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255 // Calculate the new high-water mark at which to induce
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256 // a GC.
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257 static void compute_new_size();
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258 };
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259
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260 #endif // SHARE_VM_MEMORY_METASPACE_HPP