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annotate src/share/vm/gc_implementation/g1/g1CodeCacheRemSet.hpp @ 20445:e5668dcf12e9

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8057818: collect allocation context statistics at gc pauses Reviewed-by: mikael, jmasa
author jcoomes
date Wed, 10 Sep 2014 13:01:13 -0700
parents 2c6ef90f030a
children 7baf47cb97cb
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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 // The elements of the G1CodeRootChunk is either:
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35 // 1) nmethod pointers
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36 // 2) nodes in an internally chained free list
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37 typedef union {
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38 nmethod* _nmethod;
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39 void* _link;
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40 } NmethodOrLink;
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41
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42 class G1CodeRootChunk : public CHeapObj<mtGC> {
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43 private:
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44 static const int NUM_ENTRIES = 32;
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45 public:
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46 G1CodeRootChunk* _next;
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47 G1CodeRootChunk* _prev;
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48
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49 NmethodOrLink* _top;
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50 // First free position within the chunk.
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51 volatile NmethodOrLink* _free;
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52
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53 NmethodOrLink _data[NUM_ENTRIES];
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54
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55 NmethodOrLink* bottom() const {
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56 return (NmethodOrLink*) &(_data[0]);
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57 }
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58
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59 NmethodOrLink* end() const {
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60 return (NmethodOrLink*) &(_data[NUM_ENTRIES]);
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61 }
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62
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63 bool is_link(NmethodOrLink* nmethod_or_link) {
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64 return nmethod_or_link->_link == NULL ||
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65 (bottom() <= nmethod_or_link->_link
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66 && nmethod_or_link->_link < end());
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67 }
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68
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69 bool is_nmethod(NmethodOrLink* nmethod_or_link) {
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70 return !is_link(nmethod_or_link);
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71 }
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72
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73 public:
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74 G1CodeRootChunk();
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75 ~G1CodeRootChunk() {}
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76
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77 static size_t word_size() { return (size_t)(align_size_up_(sizeof(G1CodeRootChunk), HeapWordSize) / HeapWordSize); }
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78
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79 // FreeList "interface" methods
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80
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81 G1CodeRootChunk* next() const { return _next; }
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82 G1CodeRootChunk* prev() const { return _prev; }
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83 void set_next(G1CodeRootChunk* v) { _next = v; assert(v != this, "Boom");}
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84 void set_prev(G1CodeRootChunk* v) { _prev = v; assert(v != this, "Boom");}
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85 void clear_next() { set_next(NULL); }
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86 void clear_prev() { set_prev(NULL); }
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87
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88 size_t size() const { return word_size(); }
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89
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90 void link_next(G1CodeRootChunk* ptr) { set_next(ptr); }
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91 void link_prev(G1CodeRootChunk* ptr) { set_prev(ptr); }
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92 void link_after(G1CodeRootChunk* ptr) {
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93 link_next(ptr);
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94 if (ptr != NULL) ptr->link_prev((G1CodeRootChunk*)this);
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95 }
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96
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97 bool is_free() { return true; }
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98
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99 // New G1CodeRootChunk routines
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100
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101 void reset();
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102
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103 bool is_empty() const {
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104 return _top == bottom();
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105 }
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106
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107 bool is_full() const {
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108 return _top == end() && _free == NULL;
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109 }
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110
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111 bool contains(nmethod* method) {
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112 NmethodOrLink* cur = bottom();
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113 while (cur != _top) {
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114 if (cur->_nmethod == method) return true;
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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 bool add(nmethod* method) {
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121 if (is_full()) {
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122 return false;
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123 }
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124
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125 if (_free != NULL) {
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126 // Take from internally chained free list
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127 NmethodOrLink* first_free = (NmethodOrLink*)_free;
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128 _free = (NmethodOrLink*)_free->_link;
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129 first_free->_nmethod = method;
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130 } else {
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131 // Take from top.
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132 _top->_nmethod = method;
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133 _top++;
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134 }
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135
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136 return true;
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137 }
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138
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139 bool remove_lock_free(nmethod* method);
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140
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141 void nmethods_do(CodeBlobClosure* blk);
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142
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143 nmethod* pop() {
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144 if (_free != NULL) {
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145 // Kill the free list.
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146 _free = NULL;
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147 }
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148
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149 while (!is_empty()) {
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150 _top--;
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151 if (is_nmethod(_top)) {
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152 return _top->_nmethod;
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153 }
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154 }
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155
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156 return NULL;
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157 }
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158 };
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159
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160 // Manages free chunks.
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161 class G1CodeRootChunkManager VALUE_OBJ_CLASS_SPEC {
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162 private:
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163 // Global free chunk list management
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164 FreeList<G1CodeRootChunk> _free_list;
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165 // Total number of chunks handed out
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166 size_t _num_chunks_handed_out;
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167
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168 public:
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169 G1CodeRootChunkManager();
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170
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171 G1CodeRootChunk* new_chunk();
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172 void free_chunk(G1CodeRootChunk* chunk);
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173 // Free all elements of the given list.
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174 void free_all_chunks(FreeList<G1CodeRootChunk>* list);
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175
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176 void initialize();
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177 void purge_chunks(size_t keep_ratio);
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178
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179 static size_t static_mem_size();
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180 size_t fl_mem_size();
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181
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182 #ifndef PRODUCT
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183 size_t num_chunks_handed_out() const;
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184 size_t num_free_chunks() const;
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185 #endif
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186 };
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187
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188 // Implements storage for a set of code roots.
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189 // All methods that modify the set are not thread-safe except if otherwise noted.
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190 class G1CodeRootSet VALUE_OBJ_CLASS_SPEC {
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191 private:
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192 // Global default free chunk manager instance.
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193 static G1CodeRootChunkManager _default_chunk_manager;
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194
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195 G1CodeRootChunk* new_chunk() { return _manager->new_chunk(); }
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196 void free_chunk(G1CodeRootChunk* chunk) { _manager->free_chunk(chunk); }
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197 // Free all elements of the given list.
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198 void free_all_chunks(FreeList<G1CodeRootChunk>* list) { _manager->free_all_chunks(list); }
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199
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200 // Return the chunk that contains the given nmethod, NULL otherwise.
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201 // Scans the list of chunks backwards, as this method is used to add new
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202 // entries, which are typically added in bulk for a single nmethod.
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203 G1CodeRootChunk* find(nmethod* method);
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204 void free(G1CodeRootChunk* chunk);
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205
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206 size_t _length;
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207 FreeList<G1CodeRootChunk> _list;
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208 G1CodeRootChunkManager* _manager;
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209
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210 public:
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211 // If an instance is initialized with a chunk manager of NULL, use the global
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212 // default one.
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213 G1CodeRootSet(G1CodeRootChunkManager* manager = NULL);
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214 ~G1CodeRootSet();
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215
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216 static void purge_chunks(size_t keep_ratio);
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217
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218 static size_t free_chunks_static_mem_size();
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219 static size_t free_chunks_mem_size();
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220
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221 // Search for the code blob from the recently allocated ones to find duplicates more quickly, as this
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222 // method is likely to be repeatedly called with the same nmethod.
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223 void add(nmethod* method);
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224
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225 void remove_lock_free(nmethod* method);
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226 nmethod* pop();
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227
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228 bool contains(nmethod* method);
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229
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230 void clear();
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231
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232 void nmethods_do(CodeBlobClosure* blk) const;
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233
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234 bool is_empty() { return length() == 0; }
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235
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236 // Length in elements
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237 size_t length() const { return _length; }
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238
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239 // Static data memory size in bytes of this set.
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240 static size_t static_mem_size();
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241 // Memory size in bytes taken by this set.
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242 size_t mem_size();
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243
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244 static void test() PRODUCT_RETURN;
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245 };
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246
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247 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1CODECACHEREMSET_HPP