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annotate src/share/vm/gc_implementation/g1/g1CodeCacheRemSet.cpp @ 17773:8ee855b4e667

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8036025: Sort the freelist in order to shrink the heap Summary: The free list is being maintained in a sorted fashion and old and humongous regions are allocated from the bottom of the heap while young regions are allocated at the top. Reviewed-by: tschatzl, mgerdin Contributed-by: jesper.wilhelmsson@oracle.com, staffan.friberg@oracle.com
author jwilhelm
date Fri, 28 Feb 2014 15:27:09 +0100
parents 191174b49bec
children 78bbf4d43a14
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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
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26 #include "precompiled.hpp"
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27 #include "code/nmethod.hpp"
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28 #include "gc_implementation/g1/g1CodeCacheRemSet.hpp"
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29 #include "memory/iterator.hpp"
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30
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31 G1CodeRootChunk::G1CodeRootChunk() : _top(NULL), _next(NULL), _prev(NULL) {
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32 _top = bottom();
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33 }
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34
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35 void G1CodeRootChunk::reset() {
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36 _next = _prev = NULL;
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37 _top = bottom();
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38 }
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39
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40 void G1CodeRootChunk::nmethods_do(CodeBlobClosure* cl) {
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41 nmethod** cur = bottom();
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42 while (cur != _top) {
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43 cl->do_code_blob(*cur);
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44 cur++;
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45 }
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46 }
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47
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48 FreeList<G1CodeRootChunk> G1CodeRootSet::_free_list;
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49 size_t G1CodeRootSet::_num_chunks_handed_out = 0;
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50
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51 G1CodeRootChunk* G1CodeRootSet::new_chunk() {
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52 G1CodeRootChunk* result = _free_list.get_chunk_at_head();
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53 if (result == NULL) {
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54 result = new G1CodeRootChunk();
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55 }
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56 G1CodeRootSet::_num_chunks_handed_out++;
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57 result->reset();
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58 return result;
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59 }
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60
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61 void G1CodeRootSet::free_chunk(G1CodeRootChunk* chunk) {
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62 _free_list.return_chunk_at_head(chunk);
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63 G1CodeRootSet::_num_chunks_handed_out--;
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64 }
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65
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66 void G1CodeRootSet::free_all_chunks(FreeList<G1CodeRootChunk>* list) {
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67 G1CodeRootSet::_num_chunks_handed_out -= list->count();
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68 _free_list.prepend(list);
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69 }
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70
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71 void G1CodeRootSet::purge_chunks(size_t keep_ratio) {
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72 size_t keep = G1CodeRootSet::_num_chunks_handed_out * keep_ratio / 100;
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73
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74 if (keep >= (size_t)_free_list.count()) {
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75 return;
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76 }
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77
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78 FreeList<G1CodeRootChunk> temp;
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79 temp.initialize();
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80 temp.set_size(G1CodeRootChunk::word_size());
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81
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82 _free_list.getFirstNChunksFromList((size_t)_free_list.count() - keep, &temp);
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83
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84 G1CodeRootChunk* cur = temp.get_chunk_at_head();
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85 while (cur != NULL) {
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86 delete cur;
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87 cur = temp.get_chunk_at_head();
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88 }
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89 }
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90
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91 size_t G1CodeRootSet::static_mem_size() {
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92 return sizeof(_free_list) + sizeof(_num_chunks_handed_out);
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93 }
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94
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95 size_t G1CodeRootSet::fl_mem_size() {
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96 return _free_list.count() * _free_list.size();
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97 }
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98
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99 void G1CodeRootSet::initialize() {
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100 _free_list.initialize();
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101 _free_list.set_size(G1CodeRootChunk::word_size());
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102 }
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103
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104 G1CodeRootSet::G1CodeRootSet() : _list(), _length(0) {
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105 _list.initialize();
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106 _list.set_size(G1CodeRootChunk::word_size());
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107 }
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108
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109 G1CodeRootSet::~G1CodeRootSet() {
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110 clear();
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111 }
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112
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113 void G1CodeRootSet::add(nmethod* method) {
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114 if (!contains(method)) {
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115 // Try to add the nmethod. If there is not enough space, get a new chunk.
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116 if (_list.head() == NULL || _list.head()->is_full()) {
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117 G1CodeRootChunk* cur = new_chunk();
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118 _list.return_chunk_at_head(cur);
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119 }
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120 bool result = _list.head()->add(method);
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121 guarantee(result, err_msg("Not able to add nmethod "PTR_FORMAT" to newly allocated chunk.", method));
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122 _length++;
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123 }
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124 }
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125
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126 void G1CodeRootSet::remove(nmethod* method) {
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127 G1CodeRootChunk* found = find(method);
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128 if (found != NULL) {
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129 bool result = found->remove(method);
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130 guarantee(result, err_msg("could not find nmethod "PTR_FORMAT" during removal although we previously found it", method));
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131 // eventually free completely emptied chunk
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132 if (found->is_empty()) {
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133 _list.remove_chunk(found);
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134 free(found);
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135 }
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136 _length--;
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137 }
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138 assert(!contains(method), err_msg(PTR_FORMAT" still contains nmethod "PTR_FORMAT, this, method));
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139 }
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140
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141 nmethod* G1CodeRootSet::pop() {
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142 do {
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143 G1CodeRootChunk* cur = _list.head();
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144 if (cur == NULL) {
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145 assert(_length == 0, "when there are no chunks, there should be no elements");
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146 return NULL;
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147 }
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148 nmethod* result = cur->pop();
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149 if (result != NULL) {
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150 _length--;
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151 return result;
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152 } else {
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153 free(_list.get_chunk_at_head());
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154 }
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155 } while (true);
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156 }
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157
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158 G1CodeRootChunk* G1CodeRootSet::find(nmethod* method) {
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159 G1CodeRootChunk* cur = _list.head();
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160 while (cur != NULL) {
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161 if (cur->contains(method)) {
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162 return cur;
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163 }
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164 cur = (G1CodeRootChunk*)cur->next();
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165 }
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166 return NULL;
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167 }
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168
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169 void G1CodeRootSet::free(G1CodeRootChunk* chunk) {
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170 free_chunk(chunk);
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171 }
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172
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173 bool G1CodeRootSet::contains(nmethod* method) {
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174 return find(method) != NULL;
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175 }
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176
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177 void G1CodeRootSet::clear() {
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178 free_all_chunks(&_list);
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179 _length = 0;
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180 }
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181
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182 void G1CodeRootSet::nmethods_do(CodeBlobClosure* blk) const {
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183 G1CodeRootChunk* cur = _list.head();
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184 while (cur != NULL) {
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185 cur->nmethods_do(blk);
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186 cur = (G1CodeRootChunk*)cur->next();
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187 }
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188 }
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189
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190 size_t G1CodeRootSet::mem_size() {
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191 return sizeof(this) + _list.count() * _list.size();
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192 }
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193
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194 #ifndef PRODUCT
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195
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196 void G1CodeRootSet::test() {
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197 initialize();
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198
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199 assert(_free_list.count() == 0, "Free List must be empty");
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200 assert(_num_chunks_handed_out == 0, "No elements must have been handed out yet");
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201
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202 // The number of chunks that we allocate for purge testing.
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203 size_t const num_chunks = 10;
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204 {
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205 G1CodeRootSet set1;
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206 assert(set1.is_empty(), "Code root set must be initially empty but is not.");
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207
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208 set1.add((nmethod*)1);
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209 assert(_num_chunks_handed_out == 1,
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210 err_msg("Must have allocated and handed out one chunk, but handed out "
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211 SIZE_FORMAT" chunks", _num_chunks_handed_out));
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212 assert(set1.length() == 1, err_msg("Added exactly one element, but set contains "
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213 SIZE_FORMAT" elements", set1.length()));
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214
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215 // G1CodeRootChunk::word_size() is larger than G1CodeRootChunk::num_entries which
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216 // we cannot access.
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217 for (uint i = 0; i < G1CodeRootChunk::word_size() + 1; i++) {
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218 set1.add((nmethod*)1);
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219 }
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220 assert(_num_chunks_handed_out == 1,
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221 err_msg("Duplicate detection must have prevented allocation of further "
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222 "chunks but contains "SIZE_FORMAT, _num_chunks_handed_out));
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223 assert(set1.length() == 1,
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224 err_msg("Duplicate detection should not have increased the set size but "
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225 "is "SIZE_FORMAT, set1.length()));
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226
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227 size_t num_total_after_add = G1CodeRootChunk::word_size() + 1;
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228 for (size_t i = 0; i < num_total_after_add - 1; i++) {
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229 set1.add((nmethod*)(2 + i));
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230 }
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231 assert(_num_chunks_handed_out > 1,
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232 "After adding more code roots, more than one chunks should have been handed out");
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233 assert(set1.length() == num_total_after_add,
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234 err_msg("After adding in total "SIZE_FORMAT" distinct code roots, they "
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235 "need to be in the set, but there are only "SIZE_FORMAT,
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236 num_total_after_add, set1.length()));
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237
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238 size_t num_popped = 0;
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239 while (set1.pop() != NULL) {
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240 num_popped++;
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241 }
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242 assert(num_popped == num_total_after_add,
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243 err_msg("Managed to pop "SIZE_FORMAT" code roots, but only "SIZE_FORMAT" "
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244 "were added", num_popped, num_total_after_add));
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245 assert(_num_chunks_handed_out == 0,
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246 err_msg("After popping all elements, all chunks must have been returned "
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247 "but are still "SIZE_FORMAT, _num_chunks_handed_out));
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248
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249 purge_chunks(0);
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250 assert(_free_list.count() == 0,
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251 err_msg("After purging everything, the free list must be empty but still "
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252 "contains "SIZE_FORMAT" chunks", _free_list.count()));
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253
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254 // Add some more handed out chunks.
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255 size_t i = 0;
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256 while (_num_chunks_handed_out < num_chunks) {
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257 set1.add((nmethod*)i);
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258 i++;
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259 }
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260
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261 {
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262 // Generate chunks on the free list.
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263 G1CodeRootSet set2;
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264 size_t i = 0;
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265 while (_num_chunks_handed_out < num_chunks * 2) {
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266 set2.add((nmethod*)i);
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267 i++;
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268 }
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269 // Exit of the scope of the set2 object will call the destructor that generates
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270 // num_chunks elements on the free list.
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271 }
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272
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273 assert(_num_chunks_handed_out == num_chunks,
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274 err_msg("Deletion of the second set must have resulted in giving back "
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275 "those, but there is still "SIZE_FORMAT" handed out, expecting "
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276 SIZE_FORMAT, _num_chunks_handed_out, num_chunks));
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277 assert((size_t)_free_list.count() == num_chunks,
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278 err_msg("After freeing "SIZE_FORMAT" chunks, they must be on the free list "
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279 "but there are only "SIZE_FORMAT, num_chunks, _free_list.count()));
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280
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281 size_t const test_percentage = 50;
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282 purge_chunks(test_percentage);
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283 assert(_num_chunks_handed_out == num_chunks,
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284 err_msg("Purging must not hand out chunks but there are "SIZE_FORMAT,
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285 _num_chunks_handed_out));
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286 assert((size_t)_free_list.count() == (ssize_t)(num_chunks * test_percentage / 100),
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287 err_msg("Must have purged "SIZE_FORMAT" percent of "SIZE_FORMAT" chunks"
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288 "but there are "SSIZE_FORMAT, test_percentage, num_chunks,
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289 _free_list.count()));
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290 // Purge the remainder of the chunks on the free list.
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291 purge_chunks(0);
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292 assert(_free_list.count() == 0, "Free List must be empty");
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293 assert(_num_chunks_handed_out == num_chunks,
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294 err_msg("Expected to be "SIZE_FORMAT" chunks handed out from the first set "
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295 "but there are "SIZE_FORMAT, num_chunks, _num_chunks_handed_out));
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296
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297 // Exit of the scope of the set1 object will call the destructor that generates
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298 // num_chunks additional elements on the free list.
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299 }
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300
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301 assert(_num_chunks_handed_out == 0,
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302 err_msg("Deletion of the only set must have resulted in no chunks handed "
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303 "out, but there is still "SIZE_FORMAT" handed out", _num_chunks_handed_out));
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304 assert((size_t)_free_list.count() == num_chunks,
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305 err_msg("After freeing "SIZE_FORMAT" chunks, they must be on the free list "
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306 "but there are only "SSIZE_FORMAT, num_chunks, _free_list.count()));
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307
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308 // Restore initial state.
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309 purge_chunks(0);
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310 assert(_free_list.count() == 0, "Free List must be empty");
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311 assert(_num_chunks_handed_out == 0, "No elements must have been handed out yet");
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312 }
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313
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314 void TestCodeCacheRemSet_test() {
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315 G1CodeRootSet::test();
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316 }
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317 #endif