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annotate src/share/vm/gc_implementation/g1/g1CodeCacheRemSet.hpp @ 20218:828056cf311f

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8040792: G1: Memory usage calculation uses sizeof(this) instead of sizeof(classname) Summary: A few locations in the code use sizeof(this) which returns the size of the pointer instead of sizeof(classname) which returns the size of the sum of its members. This change fixes these errors and adds a few tests. Reviewed-by: mgerdin, brutisso
author tschatzl
date Mon, 21 Jul 2014 09:40:19 +0200
parents 82693fb204a5
children 2c6ef90f030a
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1 /*
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2 * Copyright (c) 2014, 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
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25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1CODECACHEREMSET_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1CODECACHEREMSET_HPP
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27
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28 #include "memory/allocation.hpp"
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29 #include "memory/freeList.hpp"
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30 #include "runtime/globals.hpp"
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31
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32 class CodeBlobClosure;
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33
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34 class G1CodeRootChunk : public CHeapObj<mtGC> {
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35 private:
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36 static const int NUM_ENTRIES = 32;
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37 public:
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38 G1CodeRootChunk* _next;
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39 G1CodeRootChunk* _prev;
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40
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41 nmethod** _top;
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42
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43 nmethod* _data[NUM_ENTRIES];
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44
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45 nmethod** bottom() const {
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46 return (nmethod**) &(_data[0]);
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47 }
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48
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49 nmethod** end() const {
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50 return (nmethod**) &(_data[NUM_ENTRIES]);
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51 }
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52
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53 public:
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54 G1CodeRootChunk();
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55 ~G1CodeRootChunk() {}
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56
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57 static size_t word_size() { return (size_t)(align_size_up_(sizeof(G1CodeRootChunk), HeapWordSize) / HeapWordSize); }
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58
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59 // FreeList "interface" methods
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60
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61 G1CodeRootChunk* next() const { return _next; }
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62 G1CodeRootChunk* prev() const { return _prev; }
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63 void set_next(G1CodeRootChunk* v) { _next = v; assert(v != this, "Boom");}
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64 void set_prev(G1CodeRootChunk* v) { _prev = v; assert(v != this, "Boom");}
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65 void clear_next() { set_next(NULL); }
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66 void clear_prev() { set_prev(NULL); }
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67
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68 size_t size() const { return word_size(); }
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69
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70 void link_next(G1CodeRootChunk* ptr) { set_next(ptr); }
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71 void link_prev(G1CodeRootChunk* ptr) { set_prev(ptr); }
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72 void link_after(G1CodeRootChunk* ptr) {
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73 link_next(ptr);
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74 if (ptr != NULL) ptr->link_prev((G1CodeRootChunk*)this);
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75 }
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76
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77 bool is_free() { return true; }
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78
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79 // New G1CodeRootChunk routines
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80
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81 void reset();
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82
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83 bool is_empty() const {
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84 return _top == bottom();
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85 }
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86
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87 bool is_full() const {
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88 return _top == (nmethod**)end();
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89 }
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90
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91 bool contains(nmethod* method) {
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92 nmethod** cur = bottom();
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93 while (cur != _top) {
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94 if (*cur == method) return true;
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95 cur++;
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96 }
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97 return false;
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98 }
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99
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100 bool add(nmethod* method) {
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101 if (is_full()) return false;
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102 *_top = method;
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103 _top++;
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104 return true;
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105 }
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106
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107 bool remove(nmethod* method) {
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108 nmethod** cur = bottom();
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109 while (cur != _top) {
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110 if (*cur == method) {
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111 memmove(cur, cur + 1, (_top - (cur + 1)) * sizeof(nmethod**));
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112 _top--;
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113 return true;
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114 }
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115 cur++;
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116 }
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117 return false;
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118 }
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119
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120 void nmethods_do(CodeBlobClosure* blk);
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121
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122 nmethod* pop() {
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123 if (is_empty()) {
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124 return NULL;
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125 }
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126 _top--;
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127 return *_top;
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128 }
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129 };
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130
20211
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131 // Manages free chunks.
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132 class G1CodeRootChunkManager VALUE_OBJ_CLASS_SPEC {
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133 private:
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134 // Global free chunk list management
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135 FreeList<G1CodeRootChunk> _free_list;
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136 // Total number of chunks handed out
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137 size_t _num_chunks_handed_out;
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138
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139 public:
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140 G1CodeRootChunkManager();
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141
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142 G1CodeRootChunk* new_chunk();
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143 void free_chunk(G1CodeRootChunk* chunk);
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144 // Free all elements of the given list.
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145 void free_all_chunks(FreeList<G1CodeRootChunk>* list);
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146
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147 void initialize();
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148 void purge_chunks(size_t keep_ratio);
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149
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150 static size_t static_mem_size();
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151 size_t fl_mem_size();
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152
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153 #ifndef PRODUCT
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154 size_t num_chunks_handed_out() const;
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155 size_t num_free_chunks() const;
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156 #endif
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157 };
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158
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159 // Implements storage for a set of code roots.
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160 // All methods that modify the set are not thread-safe except if otherwise noted.
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161 class G1CodeRootSet VALUE_OBJ_CLASS_SPEC {
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162 private:
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163 // Global default free chunk manager instance.
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164 static G1CodeRootChunkManager _default_chunk_manager;
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165
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166 G1CodeRootChunk* new_chunk() { return _manager->new_chunk(); }
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167 void free_chunk(G1CodeRootChunk* chunk) { _manager->free_chunk(chunk); }
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168 // Free all elements of the given list.
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169 void free_all_chunks(FreeList<G1CodeRootChunk>* list) { _manager->free_all_chunks(list); }
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170
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171 // Return the chunk that contains the given nmethod, NULL otherwise.
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172 // Scans the list of chunks backwards, as this method is used to add new
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173 // entries, which are typically added in bulk for a single nmethod.
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174 G1CodeRootChunk* find(nmethod* method);
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175 void free(G1CodeRootChunk* chunk);
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176
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177 size_t _length;
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178 FreeList<G1CodeRootChunk> _list;
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179 G1CodeRootChunkManager* _manager;
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180
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181 public:
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182 // If an instance is initialized with a chunk manager of NULL, use the global
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183 // default one.
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184 G1CodeRootSet(G1CodeRootChunkManager* manager = NULL);
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185 ~G1CodeRootSet();
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186
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187 static void purge_chunks(size_t keep_ratio);
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188
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189 static size_t free_chunks_static_mem_size();
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190 static size_t free_chunks_mem_size();
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191
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192 // Search for the code blob from the recently allocated ones to find duplicates more quickly, as this
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193 // method is likely to be repeatedly called with the same nmethod.
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194 void add(nmethod* method);
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195
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196 void remove(nmethod* method);
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197 nmethod* pop();
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198
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199 bool contains(nmethod* method);
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200
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201 void clear();
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202
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203 void nmethods_do(CodeBlobClosure* blk) const;
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204
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205 bool is_empty() { return length() == 0; }
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206
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207 // Length in elements
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208 size_t length() const { return _length; }
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209
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210 // Static data memory size in bytes of this set.
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211 static size_t static_mem_size();
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212 // Memory size in bytes taken by this set.
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213 size_t mem_size();
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214
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215 static void test() PRODUCT_RETURN;
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216 };
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217
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218 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1CODECACHEREMSET_HPP