6197
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1 /*
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2 * Copyright (c) 2012, 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 #include "precompiled.hpp"
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26 #include "runtime/threadCritical.hpp"
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27 #include "services/memTracker.hpp"
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28 #include "services/memTrackWorker.hpp"
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29 #include "utilities/decoder.hpp"
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30 #include "utilities/vmError.hpp"
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31
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32 MemTrackWorker::MemTrackWorker() {
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33 // create thread uses cgc thread type for now. We should revisit
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34 // the option, or create new thread type.
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35 _has_error = !os::create_thread(this, os::cgc_thread);
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36 set_name("MemTrackWorker", 0);
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37
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38 // initial generation circuit buffer
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39 if (!has_error()) {
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40 _head = _tail = 0;
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41 for(int index = 0; index < MAX_GENERATIONS; index ++) {
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42 _gen[index] = NULL;
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43 }
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44 }
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45 NOT_PRODUCT(_sync_point_count = 0;)
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46 NOT_PRODUCT(_merge_count = 0;)
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47 NOT_PRODUCT(_last_gen_in_use = 0;)
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48 }
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49
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50 MemTrackWorker::~MemTrackWorker() {
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51 for (int index = 0; index < MAX_GENERATIONS; index ++) {
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52 MemRecorder* rc = _gen[index];
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53 if (rc != NULL) {
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54 delete rc;
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55 }
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56 }
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57 }
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58
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59 void* MemTrackWorker::operator new(size_t size) {
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60 assert(false, "use nothrow version");
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61 return NULL;
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62 }
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63
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64 void* MemTrackWorker::operator new(size_t size, const std::nothrow_t& nothrow_constant) {
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65 return allocate(size, false, mtNMT);
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66 }
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67
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68 void MemTrackWorker::start() {
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69 os::start_thread(this);
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70 }
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71
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72 /*
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73 * Native memory tracking worker thread loop:
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74 * 1. merge one generation of memory recorders to staging area
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75 * 2. promote staging data to memory snapshot
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76 *
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77 * This thread can run through safepoint.
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78 */
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79
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80 void MemTrackWorker::run() {
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81 assert(MemTracker::is_on(), "native memory tracking is off");
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82 this->initialize_thread_local_storage();
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83 this->record_stack_base_and_size();
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84 MemSnapshot* snapshot = MemTracker::get_snapshot();
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85 assert(snapshot != NULL, "Worker should not be started");
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86 MemRecorder* rec;
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87
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88 while (!MemTracker::shutdown_in_progress()) {
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89 NOT_PRODUCT(_last_gen_in_use = generations_in_use();)
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90 {
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91 // take a recorder from earliest generation in buffer
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92 ThreadCritical tc;
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93 rec = _gen[_head];
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94 if (rec != NULL) {
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95 _gen[_head] = rec->next();
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96 }
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97 assert(count_recorder(_gen[_head]) <= MemRecorder::_instance_count,
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98 "infinite loop after dequeue");
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99 }
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100 if (rec != NULL) {
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101 // merge the recorder into staging area
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102 bool result = snapshot->merge(rec);
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103 assert(result, "merge failed");
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104 debug_only(_merge_count ++;)
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105 MemTracker::release_thread_recorder(rec);
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106 } else {
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107 // no more recorder to merge, promote staging area
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108 // to snapshot
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109 if (_head != _tail) {
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110 {
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111 ThreadCritical tc;
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112 if (_gen[_head] != NULL || _head == _tail) {
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113 continue;
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114 }
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115 // done with this generation, increment _head pointer
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116 _head = (_head + 1) % MAX_GENERATIONS;
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117 }
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118 // promote this generation data to snapshot
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119 snapshot->promote();
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120 } else {
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121 snapshot->wait(1000);
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122 ThreadCritical tc;
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123 // check if more data arrived
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124 if (_gen[_head] == NULL) {
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125 _gen[_head] = MemTracker::get_pending_recorders();
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126 }
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127 }
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128 }
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129 }
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130 assert(MemTracker::shutdown_in_progress(), "just check");
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131
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132 // transites to final shutdown
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133 MemTracker::final_shutdown();
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134 }
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135
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136 // at synchronization point, where 'safepoint visible' Java threads are blocked
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137 // at a safepoint, and the rest of threads are blocked on ThreadCritical lock.
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138 // The caller MemTracker::sync() already takes ThreadCritical before calling this
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139 // method.
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140 //
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141 // Following tasks are performed:
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142 // 1. add all recorders in pending queue to current generation
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143 // 2. increase generation
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144
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145 void MemTrackWorker::at_sync_point(MemRecorder* rec) {
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146 NOT_PRODUCT(_sync_point_count ++;)
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147 assert(count_recorder(rec) <= MemRecorder::_instance_count,
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148 "pending queue has infinite loop");
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149
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150 bool out_of_generation_buffer = false;
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151 // check shutdown state inside ThreadCritical
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152 if (MemTracker::shutdown_in_progress()) return;
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153 // append the recorders to the end of the generation
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154 if( rec != NULL) {
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155 MemRecorder* cur_head = _gen[_tail];
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156 if (cur_head == NULL) {
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157 _gen[_tail] = rec;
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158 } else {
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159 while (cur_head->next() != NULL) {
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160 cur_head = cur_head->next();
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161 }
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162 cur_head->set_next(rec);
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163 }
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164 }
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165 assert(count_recorder(rec) <= MemRecorder::_instance_count,
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166 "after add to current generation has infinite loop");
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167 // we have collected all recorders for this generation. If there is data,
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168 // we need to increment _tail to start a new generation.
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169 if (_gen[_tail] != NULL || _head == _tail) {
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170 _tail = (_tail + 1) % MAX_GENERATIONS;
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171 out_of_generation_buffer = (_tail == _head);
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172 }
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173
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174 if (out_of_generation_buffer) {
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175 MemTracker::shutdown(MemTracker::NMT_out_of_generation);
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176 }
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177 }
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178
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179 #ifndef PRODUCT
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180 int MemTrackWorker::count_recorder(const MemRecorder* head) {
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181 int count = 0;
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182 while(head != NULL) {
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183 count ++;
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184 head = head->next();
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185 }
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186 return count;
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187 }
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188
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189 int MemTrackWorker::count_pending_recorders() const {
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190 int count = 0;
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191 for (int index = 0; index < MAX_GENERATIONS; index ++) {
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192 MemRecorder* head = _gen[index];
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193 if (head != NULL) {
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194 count += count_recorder(head);
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195 }
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196 }
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197 return count;
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198 }
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199 #endif
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