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6885
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1 /*
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2 * Copyright (c) 2001, 2010, 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_MEMORY_ADAPTIVEFREELIST_HPP
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26 #define SHARE_VM_MEMORY_ADAPTIVEFREELIST_HPP
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27
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28 #include "memory/freeList.hpp"
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29 #include "gc_implementation/shared/allocationStats.hpp"
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30
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31 class CompactibleFreeListSpace;
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32
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33 // A class for maintaining a free list of Chunk's. The FreeList
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34 // maintains a the structure of the list (head, tail, etc.) plus
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35 // statistics for allocations from the list. The links between items
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36 // are not part of FreeList. The statistics are
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37 // used to make decisions about coalescing Chunk's when they
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38 // are swept during collection.
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39 //
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40 // See the corresponding .cpp file for a description of the specifics
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41 // for that implementation.
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42
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43 class Mutex;
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44
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45 template <class Chunk>
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46 class AdaptiveFreeList : public FreeList<Chunk> {
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47 friend class CompactibleFreeListSpace;
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48 friend class VMStructs;
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49 // friend class PrintTreeCensusClosure<Chunk, FreeList_t>;
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50
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51 size_t _hint; // next larger size list with a positive surplus
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52
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53 AllocationStats _allocation_stats; // allocation-related statistics
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54
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55 public:
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56
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57 AdaptiveFreeList();
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58 AdaptiveFreeList(Chunk* fc);
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59
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60 using FreeList<Chunk>::assert_proper_lock_protection;
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61 #ifdef ASSERT
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62 using FreeList<Chunk>::protecting_lock;
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63 #endif
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64 using FreeList<Chunk>::count;
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65 using FreeList<Chunk>::size;
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66 using FreeList<Chunk>::verify_chunk_in_free_list;
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67 using FreeList<Chunk>::getFirstNChunksFromList;
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68 using FreeList<Chunk>::print_on;
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69 void return_chunk_at_head(Chunk* fc, bool record_return);
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70 void return_chunk_at_head(Chunk* fc);
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71 void return_chunk_at_tail(Chunk* fc, bool record_return);
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72 void return_chunk_at_tail(Chunk* fc);
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73 using FreeList<Chunk>::return_chunk_at_tail;
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74 using FreeList<Chunk>::remove_chunk;
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75 using FreeList<Chunk>::prepend;
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76 using FreeList<Chunk>::print_labels_on;
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77 using FreeList<Chunk>::get_chunk_at_head;
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78
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79 // Initialize.
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80 void initialize();
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81
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82 // Reset the head, tail, hint, and count of a free list.
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83 void reset(size_t hint);
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84
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85 void assert_proper_lock_protection_work() const PRODUCT_RETURN;
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86
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87 void print_on(outputStream* st, const char* c = NULL) const;
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88
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89 size_t hint() const {
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90 return _hint;
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91 }
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92 void set_hint(size_t v) {
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93 assert_proper_lock_protection();
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94 assert(v == 0 || size() < v, "Bad hint");
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95 _hint = v;
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96 }
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97
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98 size_t get_better_size();
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99
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100 // Accessors for statistics
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101 void init_statistics(bool split_birth = false);
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102
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103 AllocationStats* allocation_stats() {
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104 assert_proper_lock_protection();
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105 return &_allocation_stats;
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106 }
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107
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108 ssize_t desired() const {
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109 return _allocation_stats.desired();
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110 }
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111 void set_desired(ssize_t v) {
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112 assert_proper_lock_protection();
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113 _allocation_stats.set_desired(v);
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114 }
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115 void compute_desired(float inter_sweep_current,
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116 float inter_sweep_estimate,
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117 float intra_sweep_estimate) {
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118 assert_proper_lock_protection();
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119 _allocation_stats.compute_desired(count(),
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120 inter_sweep_current,
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121 inter_sweep_estimate,
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122 intra_sweep_estimate);
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123 }
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124 ssize_t coal_desired() const {
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125 return _allocation_stats.coal_desired();
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126 }
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127 void set_coal_desired(ssize_t v) {
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128 assert_proper_lock_protection();
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129 _allocation_stats.set_coal_desired(v);
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130 }
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131
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132 ssize_t surplus() const {
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133 return _allocation_stats.surplus();
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134 }
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135 void set_surplus(ssize_t v) {
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136 assert_proper_lock_protection();
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137 _allocation_stats.set_surplus(v);
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138 }
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139 void increment_surplus() {
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140 assert_proper_lock_protection();
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141 _allocation_stats.increment_surplus();
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142 }
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143 void decrement_surplus() {
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144 assert_proper_lock_protection();
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145 _allocation_stats.decrement_surplus();
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146 }
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147
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148 ssize_t bfr_surp() const {
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149 return _allocation_stats.bfr_surp();
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150 }
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151 void set_bfr_surp(ssize_t v) {
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152 assert_proper_lock_protection();
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153 _allocation_stats.set_bfr_surp(v);
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154 }
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155 ssize_t prev_sweep() const {
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156 return _allocation_stats.prev_sweep();
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157 }
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158 void set_prev_sweep(ssize_t v) {
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159 assert_proper_lock_protection();
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160 _allocation_stats.set_prev_sweep(v);
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161 }
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162 ssize_t before_sweep() const {
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163 return _allocation_stats.before_sweep();
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164 }
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165 void set_before_sweep(ssize_t v) {
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166 assert_proper_lock_protection();
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167 _allocation_stats.set_before_sweep(v);
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168 }
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169
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170 ssize_t coal_births() const {
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171 return _allocation_stats.coal_births();
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172 }
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173 void set_coal_births(ssize_t v) {
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174 assert_proper_lock_protection();
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175 _allocation_stats.set_coal_births(v);
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176 }
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177 void increment_coal_births() {
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178 assert_proper_lock_protection();
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179 _allocation_stats.increment_coal_births();
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180 }
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181
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182 ssize_t coal_deaths() const {
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183 return _allocation_stats.coal_deaths();
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184 }
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185 void set_coal_deaths(ssize_t v) {
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186 assert_proper_lock_protection();
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187 _allocation_stats.set_coal_deaths(v);
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188 }
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189 void increment_coal_deaths() {
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190 assert_proper_lock_protection();
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191 _allocation_stats.increment_coal_deaths();
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192 }
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193
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194 ssize_t split_births() const {
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195 return _allocation_stats.split_births();
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196 }
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197 void set_split_births(ssize_t v) {
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198 assert_proper_lock_protection();
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199 _allocation_stats.set_split_births(v);
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200 }
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201 void increment_split_births() {
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202 assert_proper_lock_protection();
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203 _allocation_stats.increment_split_births();
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204 }
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205
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206 ssize_t split_deaths() const {
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207 return _allocation_stats.split_deaths();
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208 }
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209 void set_split_deaths(ssize_t v) {
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210 assert_proper_lock_protection();
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211 _allocation_stats.set_split_deaths(v);
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212 }
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213 void increment_split_deaths() {
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214 assert_proper_lock_protection();
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215 _allocation_stats.increment_split_deaths();
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216 }
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217
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218 #ifndef PRODUCT
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219 // For debugging. The "_returned_bytes" in all the lists are summed
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220 // and compared with the total number of bytes swept during a
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221 // collection.
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222 size_t returned_bytes() const { return _allocation_stats.returned_bytes(); }
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223 void set_returned_bytes(size_t v) { _allocation_stats.set_returned_bytes(v); }
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224 void increment_returned_bytes_by(size_t v) {
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225 _allocation_stats.set_returned_bytes(_allocation_stats.returned_bytes() + v);
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226 }
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227 // Stats verification
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228 void verify_stats() const;
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229 #endif // NOT PRODUCT
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230 };
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231
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232 #endif // SHARE_VM_MEMORY_ADAPTIVEFREELIST_HPP
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