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annotate src/share/vm/gc_implementation/g1/g1CodeCacheRemSet.hpp @ 17935:7384f6a12fc1

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8038212: Method::is_valid_method() check has performance regression impact for stackwalking Summary: Only prune metaspace virtual spaces at safepoint so walking them is safe outside a safepoint. Reviewed-by: mgerdin, mgronlun, hseigel, stefank
author coleenp
date Thu, 15 May 2014 18:23:26 -0400
parents 191174b49bec
children 82693fb204a5
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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