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annotate src/share/vm/memory/metaspace.hpp @ 10183:868d87ed63c8

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8008966: NPG: Inefficient Metaspace counter functions cause large young GC regressions Reviewed-by: mgerdin, coleenp
author jmasa
date Tue, 12 Feb 2013 14:15:45 -0800
parents c23dbf0e8ab7
children 2b1a9d972fc2
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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 // Allocate space for metadata of type mdtype. This is space
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115 // within a Metachunk and is used by
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116 // allocate(ClassLoaderData*, size_t, bool, MetadataType, TRAPS)
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117 // which returns a Metablock.
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118 MetaWord* allocate(size_t word_size, MetadataType mdtype);
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119
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120 // Virtual Space lists for both classes and other metadata
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121 static VirtualSpaceList* _space_list;
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122 static VirtualSpaceList* _class_space_list;
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123
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124 static VirtualSpaceList* space_list() { return _space_list; }
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125 static VirtualSpaceList* class_space_list() { return _class_space_list; }
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126
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127 public:
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128
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129 Metaspace(Mutex* lock, MetaspaceType type);
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130 ~Metaspace();
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131
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132 // Initialize globals for Metaspace
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133 static void global_initialize();
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134 static void initialize_class_space(ReservedSpace rs);
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135
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136 static size_t first_chunk_word_size() { return _first_chunk_word_size; }
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137 static size_t first_class_chunk_word_size() { return _first_class_chunk_word_size; }
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138
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139 char* bottom() const;
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140 size_t used_words_slow(MetadataType mdtype) const;
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141 size_t free_words(MetadataType mdtype) const;
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142 size_t capacity_words_slow(MetadataType mdtype) const;
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143 size_t waste_words(MetadataType mdtype) const;
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144
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145 size_t used_bytes_slow(MetadataType mdtype) const;
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146 size_t capacity_bytes_slow(MetadataType mdtype) const;
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147
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148 static Metablock* allocate(ClassLoaderData* loader_data, size_t size,
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149 bool read_only, MetadataType mdtype, TRAPS);
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150 void deallocate(MetaWord* ptr, size_t byte_size, bool is_class);
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151
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152 MetaWord* expand_and_allocate(size_t size,
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153 MetadataType mdtype);
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154
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155 static bool is_initialized() { return _class_space_list != NULL; }
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156
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157 static bool contains(const void *ptr);
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158 void dump(outputStream* const out) const;
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159
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160 // Free empty virtualspaces
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161 static void purge();
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162
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163 void print_on(outputStream* st) const;
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164 // Debugging support
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165 void verify();
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166 };
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167
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168 class MetaspaceAux : AllStatic {
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169
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170 // Statistics for class space and data space in metaspace.
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171
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172 // These methods iterate over the classloader data graph
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173 // for the given Metaspace type. These are slow.
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174 static size_t used_bytes_slow(Metaspace::MetadataType mdtype);
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175 static size_t free_in_bytes(Metaspace::MetadataType mdtype);
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176 static size_t capacity_bytes_slow(Metaspace::MetadataType mdtype);
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177
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178 // Iterates over the virtual space list.
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179 static size_t reserved_in_bytes(Metaspace::MetadataType mdtype);
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180
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181 static size_t free_chunks_total(Metaspace::MetadataType mdtype);
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182 static size_t free_chunks_total_in_bytes(Metaspace::MetadataType mdtype);
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183
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184 public:
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185 // Running sum of space in all Metachunks that has been
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186 // allocated to a Metaspace. This is used instead of
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187 // iterating over all the classloaders
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188 static size_t _allocated_capacity_words;
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189 // Running sum of space in all Metachunks that have
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190 // are being used for metadata.
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191 static size_t _allocated_used_words;
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192
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193 public:
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194 // Decrement and increment _allocated_capacity_words
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195 static void dec_capacity(size_t words);
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196 static void inc_capacity(size_t words);
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197
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198 // Decrement and increment _allocated_used_words
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199 static void dec_used(size_t words);
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200 static void inc_used(size_t words);
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201
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202 // Total of space allocated to metadata in all Metaspaces.
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203 // This sums the space used in each Metachunk by
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204 // iterating over the classloader data graph
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205 static size_t used_bytes_slow() {
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206 return used_bytes_slow(Metaspace::ClassType) +
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207 used_bytes_slow(Metaspace::NonClassType);
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208 }
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209
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210 // Used by MetaspaceCounters
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211 static size_t free_chunks_total();
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212 static size_t free_chunks_total_in_bytes();
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213
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214 static size_t allocated_capacity_words() {
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215 return _allocated_capacity_words;
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216 }
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217 static size_t allocated_capacity_bytes() {
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218 return _allocated_capacity_words * BytesPerWord;
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219 }
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220
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221 static size_t allocated_used_words() {
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222 return _allocated_used_words;
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223 }
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224 static size_t allocated_used_bytes() {
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225 return _allocated_used_words * BytesPerWord;
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226 }
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227
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228 static size_t free_bytes();
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229
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230 // Total capacity in all Metaspaces
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231 static size_t capacity_bytes_slow() {
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232 #ifdef PRODUCT
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233 // Use allocated_capacity_bytes() in PRODUCT instead of this function.
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234 guarantee(false, "Should not call capacity_bytes_slow() in the PRODUCT");
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235 #endif
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236 size_t class_capacity = capacity_bytes_slow(Metaspace::ClassType);
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237 size_t non_class_capacity = capacity_bytes_slow(Metaspace::NonClassType);
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238 assert(allocated_capacity_bytes() == class_capacity + non_class_capacity,
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239 err_msg("bad accounting: allocated_capacity_bytes() " SIZE_FORMAT
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240 " class_capacity + non_class_capacity " SIZE_FORMAT
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241 " class_capacity " SIZE_FORMAT " non_class_capacity " SIZE_FORMAT,
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242 allocated_capacity_bytes(), class_capacity + non_class_capacity,
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243 class_capacity, non_class_capacity));
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244
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245 return class_capacity + non_class_capacity;
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246 }
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247
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248 // Total space reserved in all Metaspaces
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249 static size_t reserved_in_bytes() {
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250 return reserved_in_bytes(Metaspace::ClassType) +
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251 reserved_in_bytes(Metaspace::NonClassType);
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252 }
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253
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254 static size_t min_chunk_size();
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255
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256 // Print change in used metadata.
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257 static void print_metaspace_change(size_t prev_metadata_used);
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258 static void print_on(outputStream * out);
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259 static void print_on(outputStream * out, Metaspace::MetadataType mdtype);
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260
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261 static void print_waste(outputStream* out);
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262 static void dump(outputStream* out);
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263 static void verify_free_chunks();
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264 // Checks that the values returned by allocated_capacity_bytes() and
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265 // capacity_bytes_slow() are the same.
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266 static void verify_capacity();
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267 static void verify_used();
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268 static void verify_metrics();
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269 };
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270
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271 // Metaspace are deallocated when their class loader are GC'ed.
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272 // This class implements a policy for inducing GC's to recover
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273 // Metaspaces.
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274
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275 class MetaspaceGC : AllStatic {
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276
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277 // The current high-water-mark for inducing a GC. When
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278 // the capacity of all space in the virtual lists reaches this value,
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279 // a GC is induced and the value is increased. This should be changed
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280 // to the space actually used for allocations to avoid affects of
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281 // fragmentation losses to partially used chunks. Size is in words.
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282 static size_t _capacity_until_GC;
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283
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284 // After a GC is done any allocation that fails should try to expand
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285 // the capacity of the Metaspaces. This flag is set during attempts
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286 // to allocate in the VMGCOperation that does the GC.
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287 static bool _expand_after_GC;
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288
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289 // For a CMS collection, signal that a concurrent collection should
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290 // be started.
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291 static bool _should_concurrent_collect;
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292
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293 static uint _shrink_factor;
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294
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295 static void set_capacity_until_GC(size_t v) { _capacity_until_GC = v; }
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296
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297 static size_t shrink_factor() { return _shrink_factor; }
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298 void set_shrink_factor(uint v) { _shrink_factor = v; }
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299
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300 public:
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301
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302 static size_t capacity_until_GC() { return _capacity_until_GC; }
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303 static void inc_capacity_until_GC(size_t v) { _capacity_until_GC += v; }
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304 static void dec_capacity_until_GC(size_t v) {
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305 _capacity_until_GC = _capacity_until_GC > v ? _capacity_until_GC - v : 0;
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306 }
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307 static bool expand_after_GC() { return _expand_after_GC; }
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308 static void set_expand_after_GC(bool v) { _expand_after_GC = v; }
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309
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310 static bool should_concurrent_collect() { return _should_concurrent_collect; }
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311 static void set_should_concurrent_collect(bool v) {
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312 _should_concurrent_collect = v;
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313 }
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314
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315 // The amount to increase the high-water-mark (_capacity_until_GC)
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316 static size_t delta_capacity_until_GC(size_t word_size);
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317
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318 // It is expected that this will be called when the current capacity
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319 // has been used and a GC should be considered.
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320 static bool should_expand(VirtualSpaceList* vsl, size_t word_size);
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321
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322 // Calculate the new high-water mark at which to induce
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323 // a GC.
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324 static void compute_new_size();
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325 };
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326
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327 #endif // SHARE_VM_MEMORY_METASPACE_HPP