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annotate src/share/vm/memory/metaspace.hpp @ 17768:daef39043d2c

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8036698: Add trace event for updates to metaspace gc threshold Reviewed-by: stefank, mgerdin
author ehelin
date Fri, 21 Mar 2014 10:17:47 +0100
parents 40353abd7984
children bc7714614ad8
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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 MetaspaceTracer;
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64 class MetaWord;
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65 class Mutex;
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66 class outputStream;
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67 class SpaceManager;
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68 class VirtualSpaceList;
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69
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70 // Metaspaces each have a SpaceManager and allocations
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71 // are done by the SpaceManager. Allocations are done
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72 // out of the current Metachunk. When the current Metachunk
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73 // is exhausted, the SpaceManager gets a new one from
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74 // the current VirtualSpace. When the VirtualSpace is exhausted
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75 // the SpaceManager gets a new one. The SpaceManager
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76 // also manages freelists of available Chunks.
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77 //
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78 // Currently the space manager maintains the list of
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79 // virtual spaces and the list of chunks in use. Its
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80 // allocate() method returns a block for use as a
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81 // quantum of metadata.
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82
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83 class Metaspace : public CHeapObj<mtClass> {
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84 friend class VMStructs;
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85 friend class SpaceManager;
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86 friend class VM_CollectForMetadataAllocation;
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87 friend class MetaspaceGC;
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88 friend class MetaspaceAux;
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89
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90 public:
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91 enum MetadataType {
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92 ClassType,
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93 NonClassType,
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94 MetadataTypeCount
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95 };
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96 enum MetaspaceType {
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97 StandardMetaspaceType,
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98 BootMetaspaceType,
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99 ROMetaspaceType,
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100 ReadWriteMetaspaceType,
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101 AnonymousMetaspaceType,
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102 ReflectionMetaspaceType
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103 };
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104
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105 private:
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106 void initialize(Mutex* lock, MetaspaceType type);
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107
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108 // Get the first chunk for a Metaspace. Used for
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109 // special cases such as the boot class loader, reflection
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110 // class loader and anonymous class loader.
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111 Metachunk* get_initialization_chunk(MetadataType mdtype,
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112 size_t chunk_word_size,
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113 size_t chunk_bunch);
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114
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115 // Align up the word size to the allocation word size
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116 static size_t align_word_size_up(size_t);
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117
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118 // Aligned size of the metaspace.
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119 static size_t _compressed_class_space_size;
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120
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121 static size_t compressed_class_space_size() {
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122 return _compressed_class_space_size;
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123 }
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124 static void set_compressed_class_space_size(size_t size) {
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125 _compressed_class_space_size = size;
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126 }
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127
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128 static size_t _first_chunk_word_size;
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129 static size_t _first_class_chunk_word_size;
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130
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131 static size_t _commit_alignment;
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132 static size_t _reserve_alignment;
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133
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134 SpaceManager* _vsm;
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135 SpaceManager* vsm() const { return _vsm; }
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136
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137 SpaceManager* _class_vsm;
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138 SpaceManager* class_vsm() const { return _class_vsm; }
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139
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140 // Allocate space for metadata of type mdtype. This is space
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141 // within a Metachunk and is used by
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142 // allocate(ClassLoaderData*, size_t, bool, MetadataType, TRAPS)
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143 MetaWord* allocate(size_t word_size, MetadataType mdtype);
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144
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145 // Virtual Space lists for both classes and other metadata
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146 static VirtualSpaceList* _space_list;
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147 static VirtualSpaceList* _class_space_list;
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148
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149 static ChunkManager* _chunk_manager_metadata;
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150 static ChunkManager* _chunk_manager_class;
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151
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152 static const MetaspaceTracer* _tracer;
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153
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154 public:
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155 static VirtualSpaceList* space_list() { return _space_list; }
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156 static VirtualSpaceList* class_space_list() { return _class_space_list; }
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157 static VirtualSpaceList* get_space_list(MetadataType mdtype) {
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158 assert(mdtype != MetadataTypeCount, "MetadaTypeCount can't be used as mdtype");
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159 return mdtype == ClassType ? class_space_list() : space_list();
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160 }
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161
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162 static ChunkManager* chunk_manager_metadata() { return _chunk_manager_metadata; }
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163 static ChunkManager* chunk_manager_class() { return _chunk_manager_class; }
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164 static ChunkManager* get_chunk_manager(MetadataType mdtype) {
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165 assert(mdtype != MetadataTypeCount, "MetadaTypeCount can't be used as mdtype");
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166 return mdtype == ClassType ? chunk_manager_class() : chunk_manager_metadata();
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167 }
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168
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169 static const MetaspaceTracer* tracer() { return _tracer; }
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170
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171 private:
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172 // This is used by DumpSharedSpaces only, where only _vsm is used. So we will
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173 // maintain a single list for now.
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174 void record_allocation(void* ptr, MetaspaceObj::Type type, size_t word_size);
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175
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176 #ifdef _LP64
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177 static void set_narrow_klass_base_and_shift(address metaspace_base, address cds_base);
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178
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179 // Returns true if can use CDS with metaspace allocated as specified address.
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180 static bool can_use_cds_with_metaspace_addr(char* metaspace_base, address cds_base);
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181
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182 static void allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base);
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183
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184 static void initialize_class_space(ReservedSpace rs);
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185 #endif
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186
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187 class AllocRecord : public CHeapObj<mtClass> {
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188 public:
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189 AllocRecord(address ptr, MetaspaceObj::Type type, int byte_size)
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190 : _next(NULL), _ptr(ptr), _type(type), _byte_size(byte_size) {}
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191 AllocRecord *_next;
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192 address _ptr;
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193 MetaspaceObj::Type _type;
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194 int _byte_size;
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195 };
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196
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197 AllocRecord * _alloc_record_head;
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198 AllocRecord * _alloc_record_tail;
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199
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200 size_t class_chunk_size(size_t word_size);
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201
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202 public:
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203
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204 Metaspace(Mutex* lock, MetaspaceType type);
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205 ~Metaspace();
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206
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207 static void ergo_initialize();
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208 static void global_initialize();
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209
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210 static size_t first_chunk_word_size() { return _first_chunk_word_size; }
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211 static size_t first_class_chunk_word_size() { return _first_class_chunk_word_size; }
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212
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213 static size_t reserve_alignment() { return _reserve_alignment; }
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214 static size_t reserve_alignment_words() { return _reserve_alignment / BytesPerWord; }
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215 static size_t commit_alignment() { return _commit_alignment; }
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216 static size_t commit_alignment_words() { return _commit_alignment / BytesPerWord; }
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217
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218 char* bottom() const;
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219 size_t used_words_slow(MetadataType mdtype) const;
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220 size_t free_words_slow(MetadataType mdtype) const;
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221 size_t capacity_words_slow(MetadataType mdtype) const;
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222
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223 size_t used_bytes_slow(MetadataType mdtype) const;
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224 size_t capacity_bytes_slow(MetadataType mdtype) const;
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225
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226 static MetaWord* allocate(ClassLoaderData* loader_data, size_t word_size,
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227 bool read_only, MetaspaceObj::Type type, TRAPS);
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228 void deallocate(MetaWord* ptr, size_t byte_size, bool is_class);
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229
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230 MetaWord* expand_and_allocate(size_t size,
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231 MetadataType mdtype);
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232
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233 bool contains(const void* ptr);
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234 void dump(outputStream* const out) const;
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235
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236 // Free empty virtualspaces
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237 static void purge(MetadataType mdtype);
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238 static void purge();
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239
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240 static void report_metadata_oome(ClassLoaderData* loader_data, size_t word_size,
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241 MetadataType mdtype, TRAPS);
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242
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243 void print_on(outputStream* st) const;
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244 // Debugging support
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245 void verify();
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246
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247 class AllocRecordClosure : public StackObj {
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248 public:
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249 virtual void doit(address ptr, MetaspaceObj::Type type, int byte_size) = 0;
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250 };
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251
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252 void iterate(AllocRecordClosure *closure);
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253
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254 // Return TRUE only if UseCompressedClassPointers is True and DumpSharedSpaces is False.
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255 static bool using_class_space() {
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256 return NOT_LP64(false) LP64_ONLY(UseCompressedClassPointers && !DumpSharedSpaces);
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257 }
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258
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259 static bool is_class_space_allocation(MetadataType mdType) {
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260 return mdType == ClassType && using_class_space();
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261 }
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262
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263 };
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264
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265 class MetaspaceAux : AllStatic {
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266 static size_t free_chunks_total_words(Metaspace::MetadataType mdtype);
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267
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268 // These methods iterate over the classloader data graph
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269 // for the given Metaspace type. These are slow.
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270 static size_t used_bytes_slow(Metaspace::MetadataType mdtype);
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271 static size_t free_bytes_slow(Metaspace::MetadataType mdtype);
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272 static size_t capacity_bytes_slow(Metaspace::MetadataType mdtype);
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273 static size_t capacity_bytes_slow();
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274
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275 // Running sum of space in all Metachunks that has been
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276 // allocated to a Metaspace. This is used instead of
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277 // iterating over all the classloaders. One for each
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278 // type of Metadata
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279 static size_t _allocated_capacity_words[Metaspace:: MetadataTypeCount];
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280 // Running sum of space in all Metachunks that have
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281 // are being used for metadata. One for each
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282 // type of Metadata.
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283 static size_t _allocated_used_words[Metaspace:: MetadataTypeCount];
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284
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285 public:
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286 // Decrement and increment _allocated_capacity_words
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287 static void dec_capacity(Metaspace::MetadataType type, size_t words);
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288 static void inc_capacity(Metaspace::MetadataType type, size_t words);
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289
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290 // Decrement and increment _allocated_used_words
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291 static void dec_used(Metaspace::MetadataType type, size_t words);
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292 static void inc_used(Metaspace::MetadataType type, size_t words);
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293
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294 // Total of space allocated to metadata in all Metaspaces.
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295 // This sums the space used in each Metachunk by
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296 // iterating over the classloader data graph
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297 static size_t used_bytes_slow() {
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298 return used_bytes_slow(Metaspace::ClassType) +
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299 used_bytes_slow(Metaspace::NonClassType);
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300 }
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301
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302 // Used by MetaspaceCounters
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303 static size_t free_chunks_total_words();
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304 static size_t free_chunks_total_bytes();
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305 static size_t free_chunks_total_bytes(Metaspace::MetadataType mdtype);
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306
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307 static size_t allocated_capacity_words(Metaspace::MetadataType mdtype) {
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308 return _allocated_capacity_words[mdtype];
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309 }
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310 static size_t allocated_capacity_words() {
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311 return allocated_capacity_words(Metaspace::NonClassType) +
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312 allocated_capacity_words(Metaspace::ClassType);
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313 }
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314 static size_t allocated_capacity_bytes(Metaspace::MetadataType mdtype) {
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315 return allocated_capacity_words(mdtype) * BytesPerWord;
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316 }
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317 static size_t allocated_capacity_bytes() {
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318 return allocated_capacity_words() * BytesPerWord;
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319 }
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320
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321 static size_t allocated_used_words(Metaspace::MetadataType mdtype) {
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322 return _allocated_used_words[mdtype];
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323 }
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324 static size_t allocated_used_words() {
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325 return allocated_used_words(Metaspace::NonClassType) +
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326 allocated_used_words(Metaspace::ClassType);
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327 }
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328 static size_t allocated_used_bytes(Metaspace::MetadataType mdtype) {
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329 return allocated_used_words(mdtype) * BytesPerWord;
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330 }
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331 static size_t allocated_used_bytes() {
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332 return allocated_used_words() * BytesPerWord;
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333 }
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334
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335 static size_t free_bytes();
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336 static size_t free_bytes(Metaspace::MetadataType mdtype);
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337
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338 static size_t reserved_bytes(Metaspace::MetadataType mdtype);
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339 static size_t reserved_bytes() {
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340 return reserved_bytes(Metaspace::ClassType) +
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341 reserved_bytes(Metaspace::NonClassType);
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342 }
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343
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344 static size_t committed_bytes(Metaspace::MetadataType mdtype);
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345 static size_t committed_bytes() {
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346 return committed_bytes(Metaspace::ClassType) +
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347 committed_bytes(Metaspace::NonClassType);
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348 }
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349
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350 static size_t min_chunk_size_words();
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351 static size_t min_chunk_size_bytes() {
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352 return min_chunk_size_words() * BytesPerWord;
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353 }
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354
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355 // Print change in used metadata.
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356 static void print_metaspace_change(size_t prev_metadata_used);
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357 static void print_on(outputStream * out);
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358 static void print_on(outputStream * out, Metaspace::MetadataType mdtype);
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359
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360 static void print_class_waste(outputStream* out);
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361 static void print_waste(outputStream* out);
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362 static void dump(outputStream* out);
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363 static void verify_free_chunks();
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364 // Checks that the values returned by allocated_capacity_bytes() and
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365 // capacity_bytes_slow() are the same.
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366 static void verify_capacity();
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367 static void verify_used();
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368 static void verify_metrics();
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369 };
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370
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371 // Metaspace are deallocated when their class loader are GC'ed.
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372 // This class implements a policy for inducing GC's to recover
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373 // Metaspaces.
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374
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375 class MetaspaceGC : AllStatic {
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376
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377 // The current high-water-mark for inducing a GC.
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378 // When committed memory of all metaspaces reaches this value,
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379 // a GC is induced and the value is increased. Size is in bytes.
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380 static volatile intptr_t _capacity_until_GC;
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381
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382 // For a CMS collection, signal that a concurrent collection should
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383 // be started.
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384 static bool _should_concurrent_collect;
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385
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386 static uint _shrink_factor;
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387
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388 static size_t shrink_factor() { return _shrink_factor; }
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389 void set_shrink_factor(uint v) { _shrink_factor = v; }
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390
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391 public:
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392
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393 static void initialize() { _capacity_until_GC = MetaspaceSize; }
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394
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395 static size_t capacity_until_GC();
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396 static size_t inc_capacity_until_GC(size_t v);
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397 static size_t dec_capacity_until_GC(size_t v);
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398
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399 static bool should_concurrent_collect() { return _should_concurrent_collect; }
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400 static void set_should_concurrent_collect(bool v) {
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401 _should_concurrent_collect = v;
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402 }
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403
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404 // The amount to increase the high-water-mark (_capacity_until_GC)
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405 static size_t delta_capacity_until_GC(size_t bytes);
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406
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407 // Tells if we have can expand metaspace without hitting set limits.
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408 static bool can_expand(size_t words, bool is_class);
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409
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410 // Returns amount that we can expand without hitting a GC,
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411 // measured in words.
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412 static size_t allowed_expansion();
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413
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414 // Calculate the new high-water mark at which to induce
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415 // a GC.
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416 static void compute_new_size();
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417 };
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418
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419 #endif // SHARE_VM_MEMORY_METASPACE_HPP