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annotate src/share/vm/memory/metaspace.hpp @ 12902:bdfbb1fb19ca

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8026391: The Metachunk header wastes memory Reviewed-by: coleenp, jmasa
author stefank
date Tue, 15 Oct 2013 14:28:51 +0200
parents 85c1ca43713f
children a6177f601c64
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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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61 class Metablock;
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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 _class_metaspace_size;
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119
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120 static size_t class_metaspace_size() {
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121 return _class_metaspace_size;
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122 }
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123 static void set_class_metaspace_size(size_t metaspace_size) {
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124 _class_metaspace_size = metaspace_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 public:
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196
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197 Metaspace(Mutex* lock, MetaspaceType type);
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198 ~Metaspace();
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199
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200 static void ergo_initialize();
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201 static void global_initialize();
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202
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203 static size_t first_chunk_word_size() { return _first_chunk_word_size; }
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204 static size_t first_class_chunk_word_size() { return _first_class_chunk_word_size; }
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205
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206 static size_t reserve_alignment() { return _reserve_alignment; }
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207 static size_t reserve_alignment_words() { return _reserve_alignment / BytesPerWord; }
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208 static size_t commit_alignment() { return _commit_alignment; }
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209 static size_t commit_alignment_words() { return _commit_alignment / BytesPerWord; }
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210
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211 char* bottom() const;
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212 size_t used_words_slow(MetadataType mdtype) const;
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213 size_t free_words_slow(MetadataType mdtype) const;
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214 size_t capacity_words_slow(MetadataType mdtype) const;
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215
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216 size_t used_bytes_slow(MetadataType mdtype) const;
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217 size_t capacity_bytes_slow(MetadataType mdtype) const;
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218
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219 static MetaWord* allocate(ClassLoaderData* loader_data, size_t word_size,
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220 bool read_only, MetaspaceObj::Type type, TRAPS);
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221 void deallocate(MetaWord* ptr, size_t byte_size, bool is_class);
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222
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223 MetaWord* expand_and_allocate(size_t size,
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224 MetadataType mdtype);
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225
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226 static bool contains(const void *ptr);
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227 void dump(outputStream* const out) const;
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228
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229 // Free empty virtualspaces
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230 static void purge(MetadataType mdtype);
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231 static void purge();
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232
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233 static void report_metadata_oome(ClassLoaderData* loader_data, size_t word_size,
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234 MetadataType mdtype, TRAPS);
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235
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236 void print_on(outputStream* st) const;
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237 // Debugging support
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238 void verify();
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239
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240 class AllocRecordClosure : public StackObj {
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241 public:
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242 virtual void doit(address ptr, MetaspaceObj::Type type, int byte_size) = 0;
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243 };
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244
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245 void iterate(AllocRecordClosure *closure);
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246
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247 // Return TRUE only if UseCompressedClassPointers is True and DumpSharedSpaces is False.
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248 static bool using_class_space() {
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249 return NOT_LP64(false) LP64_ONLY(UseCompressedClassPointers && !DumpSharedSpaces);
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250 }
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251
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252 static bool is_class_space_allocation(MetadataType mdType) {
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253 return mdType == ClassType && using_class_space();
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254 }
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255 };
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256
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257 class MetaspaceAux : AllStatic {
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258 static size_t free_chunks_total_words(Metaspace::MetadataType mdtype);
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259
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260 // These methods iterate over the classloader data graph
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261 // for the given Metaspace type. These are slow.
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262 static size_t used_bytes_slow(Metaspace::MetadataType mdtype);
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263 static size_t free_bytes_slow(Metaspace::MetadataType mdtype);
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264 static size_t capacity_bytes_slow(Metaspace::MetadataType mdtype);
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265 static size_t capacity_bytes_slow();
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266
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267 // Running sum of space in all Metachunks that has been
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268 // allocated to a Metaspace. This is used instead of
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269 // iterating over all the classloaders. One for each
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270 // type of Metadata
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271 static size_t _allocated_capacity_words[Metaspace:: MetadataTypeCount];
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272 // Running sum of space in all Metachunks that have
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273 // are being used for metadata. One for each
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274 // type of Metadata.
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275 static size_t _allocated_used_words[Metaspace:: MetadataTypeCount];
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276
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277 public:
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278 // Decrement and increment _allocated_capacity_words
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279 static void dec_capacity(Metaspace::MetadataType type, size_t words);
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280 static void inc_capacity(Metaspace::MetadataType type, size_t words);
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281
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282 // Decrement and increment _allocated_used_words
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283 static void dec_used(Metaspace::MetadataType type, size_t words);
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284 static void inc_used(Metaspace::MetadataType type, size_t words);
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285
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286 // Total of space allocated to metadata in all Metaspaces.
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287 // This sums the space used in each Metachunk by
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288 // iterating over the classloader data graph
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289 static size_t used_bytes_slow() {
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290 return used_bytes_slow(Metaspace::ClassType) +
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291 used_bytes_slow(Metaspace::NonClassType);
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292 }
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293
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294 // Used by MetaspaceCounters
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295 static size_t free_chunks_total_words();
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296 static size_t free_chunks_total_bytes();
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297 static size_t free_chunks_total_bytes(Metaspace::MetadataType mdtype);
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298
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299 static size_t allocated_capacity_words(Metaspace::MetadataType mdtype) {
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300 return _allocated_capacity_words[mdtype];
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301 }
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302 static size_t allocated_capacity_words() {
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303 return allocated_capacity_words(Metaspace::NonClassType) +
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304 allocated_capacity_words(Metaspace::ClassType);
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305 }
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306 static size_t allocated_capacity_bytes(Metaspace::MetadataType mdtype) {
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307 return allocated_capacity_words(mdtype) * BytesPerWord;
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308 }
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309 static size_t allocated_capacity_bytes() {
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310 return allocated_capacity_words() * BytesPerWord;
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311 }
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312
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313 static size_t allocated_used_words(Metaspace::MetadataType mdtype) {
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314 return _allocated_used_words[mdtype];
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315 }
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316 static size_t allocated_used_words() {
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317 return allocated_used_words(Metaspace::NonClassType) +
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318 allocated_used_words(Metaspace::ClassType);
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319 }
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320 static size_t allocated_used_bytes(Metaspace::MetadataType mdtype) {
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321 return allocated_used_words(mdtype) * BytesPerWord;
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322 }
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323 static size_t allocated_used_bytes() {
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324 return allocated_used_words() * BytesPerWord;
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325 }
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326
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327 static size_t free_bytes();
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328 static size_t free_bytes(Metaspace::MetadataType mdtype);
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329
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330 static size_t reserved_bytes(Metaspace::MetadataType mdtype);
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331 static size_t reserved_bytes() {
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332 return reserved_bytes(Metaspace::ClassType) +
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333 reserved_bytes(Metaspace::NonClassType);
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334 }
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335
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336 static size_t committed_bytes(Metaspace::MetadataType mdtype);
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337 static size_t committed_bytes() {
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338 return committed_bytes(Metaspace::ClassType) +
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339 committed_bytes(Metaspace::NonClassType);
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340 }
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341
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342 static size_t min_chunk_size_words();
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343 static size_t min_chunk_size_bytes() {
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344 return min_chunk_size_words() * BytesPerWord;
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345 }
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346
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347 // Print change in used metadata.
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348 static void print_metaspace_change(size_t prev_metadata_used);
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349 static void print_on(outputStream * out);
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350 static void print_on(outputStream * out, Metaspace::MetadataType mdtype);
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351
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352 static void print_class_waste(outputStream* out);
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353 static void print_waste(outputStream* out);
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354 static void dump(outputStream* out);
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355 static void verify_free_chunks();
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356 // Checks that the values returned by allocated_capacity_bytes() and
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357 // capacity_bytes_slow() are the same.
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358 static void verify_capacity();
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359 static void verify_used();
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360 static void verify_metrics();
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361 };
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362
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363 // Metaspace are deallocated when their class loader are GC'ed.
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364 // This class implements a policy for inducing GC's to recover
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365 // Metaspaces.
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366
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367 class MetaspaceGC : AllStatic {
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368
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369 // The current high-water-mark for inducing a GC.
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370 // When committed memory of all metaspaces reaches this value,
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371 // a GC is induced and the value is increased. Size is in bytes.
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372 static volatile intptr_t _capacity_until_GC;
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373
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374 // For a CMS collection, signal that a concurrent collection should
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375 // be started.
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376 static bool _should_concurrent_collect;
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377
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378 static uint _shrink_factor;
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379
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380 static size_t shrink_factor() { return _shrink_factor; }
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381 void set_shrink_factor(uint v) { _shrink_factor = v; }
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382
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383 public:
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384
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385 static void initialize() { _capacity_until_GC = MetaspaceSize; }
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386
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387 static size_t capacity_until_GC();
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388 static size_t inc_capacity_until_GC(size_t v);
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389 static size_t dec_capacity_until_GC(size_t v);
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390
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391 static bool should_concurrent_collect() { return _should_concurrent_collect; }
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392 static void set_should_concurrent_collect(bool v) {
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393 _should_concurrent_collect = v;
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394 }
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395
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396 // The amount to increase the high-water-mark (_capacity_until_GC)
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397 static size_t delta_capacity_until_GC(size_t bytes);
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398
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399 // Tells if we have can expand metaspace without hitting set limits.
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400 static bool can_expand(size_t words, bool is_class);
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401
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402 // Returns amount that we can expand without hitting a GC,
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403 // measured in words.
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404 static size_t allowed_expansion();
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405
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406 // Calculate the new high-water mark at which to induce
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407 // a GC.
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408 static void compute_new_size();
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409 };
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410
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411 #endif // SHARE_VM_MEMORY_METASPACE_HPP