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annotate src/share/vm/memory/metaspace.hpp @ 12236:c4c768305a8f

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8024638: Count and expose the amount of committed memory in the metaspaces Reviewed-by: brutisso, ehelin
author stefank
date Thu, 12 Sep 2013 10:15:54 +0200
parents d6c266999345
children b960c9df4f11
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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 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 = 0,
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90 NonClassType = ClassType + 1,
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91 MetadataTypeCount = ClassType + 2
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92 };
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93 enum MetaspaceType {
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94 StandardMetaspaceType,
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95 BootMetaspaceType,
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96 ROMetaspaceType,
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97 ReadWriteMetaspaceType,
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98 AnonymousMetaspaceType,
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99 ReflectionMetaspaceType
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100 };
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101
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102 private:
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103 void initialize(Mutex* lock, MetaspaceType type);
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104
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105 // Align up the word size to the allocation word size
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106 static size_t align_word_size_up(size_t);
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107
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108 // Aligned size of the metaspace.
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109 static size_t _class_metaspace_size;
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110
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111 static size_t class_metaspace_size() {
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112 return _class_metaspace_size;
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113 }
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114 static void set_class_metaspace_size(size_t metaspace_size) {
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115 _class_metaspace_size = metaspace_size;
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116 }
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117
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118 static size_t _first_chunk_word_size;
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119 static size_t _first_class_chunk_word_size;
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120
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121 SpaceManager* _vsm;
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122 SpaceManager* vsm() const { return _vsm; }
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123
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124 SpaceManager* _class_vsm;
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125 SpaceManager* class_vsm() const { return _class_vsm; }
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126
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127 // Allocate space for metadata of type mdtype. This is space
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128 // within a Metachunk and is used by
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129 // allocate(ClassLoaderData*, size_t, bool, MetadataType, TRAPS)
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130 // which returns a Metablock.
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131 MetaWord* allocate(size_t word_size, MetadataType mdtype);
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132
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133 // Virtual Space lists for both classes and other metadata
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134 static VirtualSpaceList* _space_list;
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135 static VirtualSpaceList* _class_space_list;
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136
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137 static VirtualSpaceList* space_list() { return _space_list; }
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138 static VirtualSpaceList* class_space_list() { return _class_space_list; }
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139 static VirtualSpaceList* get_space_list(MetadataType mdtype) {
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140 assert(mdtype != MetadataTypeCount, "MetadaTypeCount can't be used as mdtype");
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141 return mdtype == ClassType ? class_space_list() : space_list();
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142 }
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143
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144 // This is used by DumpSharedSpaces only, where only _vsm is used. So we will
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145 // maintain a single list for now.
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146 void record_allocation(void* ptr, MetaspaceObj::Type type, size_t word_size);
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147
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148 #ifdef _LP64
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149 static void set_narrow_klass_base_and_shift(address metaspace_base, address cds_base);
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150
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151 // Returns true if can use CDS with metaspace allocated as specified address.
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152 static bool can_use_cds_with_metaspace_addr(char* metaspace_base, address cds_base);
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153
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154 static void allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base);
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155
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156 static void initialize_class_space(ReservedSpace rs);
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157 #endif
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158
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159 class AllocRecord : public CHeapObj<mtClass> {
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160 public:
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161 AllocRecord(address ptr, MetaspaceObj::Type type, int byte_size)
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162 : _next(NULL), _ptr(ptr), _type(type), _byte_size(byte_size) {}
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163 AllocRecord *_next;
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164 address _ptr;
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165 MetaspaceObj::Type _type;
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166 int _byte_size;
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167 };
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168
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169 AllocRecord * _alloc_record_head;
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170 AllocRecord * _alloc_record_tail;
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171
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172 public:
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173
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174 Metaspace(Mutex* lock, MetaspaceType type);
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175 ~Metaspace();
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176
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177 // Initialize globals for Metaspace
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178 static void global_initialize();
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179
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180 static size_t first_chunk_word_size() { return _first_chunk_word_size; }
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181 static size_t first_class_chunk_word_size() { return _first_class_chunk_word_size; }
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182
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183 char* bottom() const;
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184 size_t used_words_slow(MetadataType mdtype) const;
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185 size_t free_words_slow(MetadataType mdtype) const;
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186 size_t capacity_words_slow(MetadataType mdtype) const;
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187
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188 size_t used_bytes_slow(MetadataType mdtype) const;
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189 size_t capacity_bytes_slow(MetadataType mdtype) const;
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190
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191 static Metablock* allocate(ClassLoaderData* loader_data, size_t word_size,
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192 bool read_only, MetaspaceObj::Type type, TRAPS);
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193 void deallocate(MetaWord* ptr, size_t byte_size, bool is_class);
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194
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195 MetaWord* expand_and_allocate(size_t size,
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196 MetadataType mdtype);
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197
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198 static bool contains(const void *ptr);
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199 void dump(outputStream* const out) const;
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200
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201 // Free empty virtualspaces
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202 static void purge();
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203
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204 void print_on(outputStream* st) const;
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205 // Debugging support
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206 void verify();
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207
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208 class AllocRecordClosure : public StackObj {
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209 public:
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210 virtual void doit(address ptr, MetaspaceObj::Type type, int byte_size) = 0;
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211 };
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212
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213 void iterate(AllocRecordClosure *closure);
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214
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215 // Return TRUE only if UseCompressedClassPointers is True and DumpSharedSpaces is False.
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216 static bool using_class_space() {
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217 return NOT_LP64(false) LP64_ONLY(UseCompressedClassPointers && !DumpSharedSpaces);
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218 }
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219
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220 };
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221
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222 class MetaspaceAux : AllStatic {
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223 static size_t free_chunks_total_words(Metaspace::MetadataType mdtype);
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224
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225 // These methods iterate over the classloader data graph
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226 // for the given Metaspace type. These are slow.
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227 static size_t used_bytes_slow(Metaspace::MetadataType mdtype);
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228 static size_t free_bytes_slow(Metaspace::MetadataType mdtype);
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229 static size_t capacity_bytes_slow(Metaspace::MetadataType mdtype);
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230 static size_t capacity_bytes_slow();
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231
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232 // Running sum of space in all Metachunks that has been
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233 // allocated to a Metaspace. This is used instead of
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234 // iterating over all the classloaders. One for each
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235 // type of Metadata
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236 static size_t _allocated_capacity_words[Metaspace:: MetadataTypeCount];
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237 // Running sum of space in all Metachunks that have
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238 // are being used for metadata. One for each
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239 // type of Metadata.
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240 static size_t _allocated_used_words[Metaspace:: MetadataTypeCount];
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241
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242 public:
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243 // Decrement and increment _allocated_capacity_words
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244 static void dec_capacity(Metaspace::MetadataType type, size_t words);
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245 static void inc_capacity(Metaspace::MetadataType type, size_t words);
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246
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247 // Decrement and increment _allocated_used_words
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248 static void dec_used(Metaspace::MetadataType type, size_t words);
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249 static void inc_used(Metaspace::MetadataType type, size_t words);
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250
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251 // Total of space allocated to metadata in all Metaspaces.
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252 // This sums the space used in each Metachunk by
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253 // iterating over the classloader data graph
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254 static size_t used_bytes_slow() {
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255 return used_bytes_slow(Metaspace::ClassType) +
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256 used_bytes_slow(Metaspace::NonClassType);
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257 }
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258
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259 // Used by MetaspaceCounters
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260 static size_t free_chunks_total_words();
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261 static size_t free_chunks_total_bytes();
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262 static size_t free_chunks_total_bytes(Metaspace::MetadataType mdtype);
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263
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264 static size_t allocated_capacity_words(Metaspace::MetadataType mdtype) {
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265 return _allocated_capacity_words[mdtype];
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266 }
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267 static size_t allocated_capacity_words() {
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268 return allocated_capacity_words(Metaspace::NonClassType) +
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269 allocated_capacity_words(Metaspace::ClassType);
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270 }
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271 static size_t allocated_capacity_bytes(Metaspace::MetadataType mdtype) {
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272 return allocated_capacity_words(mdtype) * BytesPerWord;
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273 }
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274 static size_t allocated_capacity_bytes() {
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275 return allocated_capacity_words() * BytesPerWord;
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276 }
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277
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278 static size_t allocated_used_words(Metaspace::MetadataType mdtype) {
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279 return _allocated_used_words[mdtype];
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280 }
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281 static size_t allocated_used_words() {
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282 return allocated_used_words(Metaspace::NonClassType) +
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283 allocated_used_words(Metaspace::ClassType);
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284 }
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285 static size_t allocated_used_bytes(Metaspace::MetadataType mdtype) {
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286 return allocated_used_words(mdtype) * BytesPerWord;
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287 }
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288 static size_t allocated_used_bytes() {
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289 return allocated_used_words() * BytesPerWord;
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290 }
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291
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292 static size_t free_bytes();
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293 static size_t free_bytes(Metaspace::MetadataType mdtype);
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294
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295 static size_t reserved_bytes(Metaspace::MetadataType mdtype);
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296 static size_t reserved_bytes() {
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297 return reserved_bytes(Metaspace::ClassType) +
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298 reserved_bytes(Metaspace::NonClassType);
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299 }
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300
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301 static size_t committed_bytes(Metaspace::MetadataType mdtype);
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302 static size_t committed_bytes() {
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303 return committed_bytes(Metaspace::ClassType) +
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304 committed_bytes(Metaspace::NonClassType);
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305 }
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306
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307 static size_t min_chunk_size_words();
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308 static size_t min_chunk_size_bytes() {
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309 return min_chunk_size_words() * BytesPerWord;
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310 }
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311
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312 // Print change in used metadata.
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313 static void print_metaspace_change(size_t prev_metadata_used);
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314 static void print_on(outputStream * out);
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315 static void print_on(outputStream * out, Metaspace::MetadataType mdtype);
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316
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317 static void print_class_waste(outputStream* out);
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318 static void print_waste(outputStream* out);
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319 static void dump(outputStream* out);
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320 static void verify_free_chunks();
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321 // Checks that the values returned by allocated_capacity_bytes() and
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322 // capacity_bytes_slow() are the same.
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323 static void verify_capacity();
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324 static void verify_used();
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325 static void verify_metrics();
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326 };
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327
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328 // Metaspace are deallocated when their class loader are GC'ed.
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329 // This class implements a policy for inducing GC's to recover
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330 // Metaspaces.
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331
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332 class MetaspaceGC : AllStatic {
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333
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334 // The current high-water-mark for inducing a GC. When
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335 // the capacity of all space in the virtual lists reaches this value,
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336 // a GC is induced and the value is increased. This should be changed
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337 // to the space actually used for allocations to avoid affects of
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338 // fragmentation losses to partially used chunks. Size is in words.
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339 static size_t _capacity_until_GC;
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340
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341 // After a GC is done any allocation that fails should try to expand
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342 // the capacity of the Metaspaces. This flag is set during attempts
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343 // to allocate in the VMGCOperation that does the GC.
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344 static bool _expand_after_GC;
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345
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346 // For a CMS collection, signal that a concurrent collection should
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347 // be started.
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348 static bool _should_concurrent_collect;
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349
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350 static uint _shrink_factor;
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351
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352 static void set_capacity_until_GC(size_t v) { _capacity_until_GC = v; }
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353
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354 static size_t shrink_factor() { return _shrink_factor; }
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355 void set_shrink_factor(uint v) { _shrink_factor = v; }
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356
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357 public:
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358
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359 static size_t capacity_until_GC() { return _capacity_until_GC; }
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360 static void inc_capacity_until_GC(size_t v) { _capacity_until_GC += v; }
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361 static void dec_capacity_until_GC(size_t v) {
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362 _capacity_until_GC = _capacity_until_GC > v ? _capacity_until_GC - v : 0;
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363 }
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364 static bool expand_after_GC() { return _expand_after_GC; }
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365 static void set_expand_after_GC(bool v) { _expand_after_GC = v; }
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366
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367 static bool should_concurrent_collect() { return _should_concurrent_collect; }
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368 static void set_should_concurrent_collect(bool v) {
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369 _should_concurrent_collect = v;
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370 }
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371
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372 // The amount to increase the high-water-mark (_capacity_until_GC)
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373 static size_t delta_capacity_until_GC(size_t word_size);
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374
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375 // It is expected that this will be called when the current capacity
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376 // has been used and a GC should be considered.
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377 static bool should_expand(VirtualSpaceList* vsl, size_t word_size);
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378
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379 // Calculate the new high-water mark at which to induce
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380 // a GC.
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381 static void compute_new_size();
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382 };
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383
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384 #endif // SHARE_VM_MEMORY_METASPACE_HPP