Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CodeCacheRemSet.hpp @ 17755:96b1c2e06e25
8027295: Free CSet takes ~50% of young pause time
Summary: Improve fast card cache iteration and avoid taking locks when freeing the collection set.
Reviewed-by: brutisso
author | tschatzl |
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date | Mon, 24 Mar 2014 15:30:36 +0100 |
parents | 191174b49bec |
children | 82693fb204a5 |
rev | line source |
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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 |
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131 // Implements storage for a set of code roots. |
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132 // All methods that modify the set are not thread-safe except if otherwise noted. |
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133 class G1CodeRootSet VALUE_OBJ_CLASS_SPEC { |
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134 private: |
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135 // Global free chunk list management |
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136 static FreeList<G1CodeRootChunk> _free_list; |
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137 // Total number of chunks handed out |
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138 static size_t _num_chunks_handed_out; |
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139 |
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140 static G1CodeRootChunk* new_chunk(); |
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141 static void free_chunk(G1CodeRootChunk* chunk); |
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142 // Free all elements of the given list. |
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143 static void free_all_chunks(FreeList<G1CodeRootChunk>* list); |
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144 |
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145 // Return the chunk that contains the given nmethod, NULL otherwise. |
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146 // Scans the list of chunks backwards, as this method is used to add new |
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147 // entries, which are typically added in bulk for a single nmethod. |
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148 G1CodeRootChunk* find(nmethod* method); |
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149 void free(G1CodeRootChunk* chunk); |
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150 |
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151 size_t _length; |
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152 FreeList<G1CodeRootChunk> _list; |
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153 |
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154 public: |
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155 G1CodeRootSet(); |
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156 ~G1CodeRootSet(); |
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157 |
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158 static void initialize(); |
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159 static void purge_chunks(size_t keep_ratio); |
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160 |
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161 static size_t static_mem_size(); |
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162 static size_t fl_mem_size(); |
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163 |
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164 // Search for the code blob from the recently allocated ones to find duplicates more quickly, as this |
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165 // method is likely to be repeatedly called with the same nmethod. |
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166 void add(nmethod* method); |
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167 |
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168 void remove(nmethod* method); |
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169 nmethod* pop(); |
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170 |
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171 bool contains(nmethod* method); |
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172 |
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173 void clear(); |
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174 |
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175 void nmethods_do(CodeBlobClosure* blk) const; |
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176 |
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177 bool is_empty() { return length() == 0; } |
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178 |
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179 // Length in elements |
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180 size_t length() const { return _length; } |
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181 |
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182 // Memory size in bytes taken by this set. |
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183 size_t mem_size(); |
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184 |
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185 static void test() PRODUCT_RETURN; |
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186 }; |
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187 |
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188 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1CODECACHEREMSET_HPP |