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1 /*
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2 * Copyright 2001-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 # include "incls/_precompiled.incl"
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26 # include "incls/_statSampler.cpp.incl"
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27
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28 // --------------------------------------------------------
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29 // StatSamplerTask
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30
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31 class StatSamplerTask : public PeriodicTask {
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32 public:
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33 StatSamplerTask(int interval_time) : PeriodicTask(interval_time) {}
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34 void task() { StatSampler::collect_sample(); }
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35 };
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36
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37
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38 //----------------------------------------------------------
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39 // Implementation of StatSampler
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40
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41 StatSamplerTask* StatSampler::_task = NULL;
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42 PerfDataList* StatSampler::_sampled = NULL;
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43
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44 /*
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45 * the initialize method is called from the engage() method
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46 * and is responsible for initializing various global variables.
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47 */
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48 void StatSampler::initialize() {
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49
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50 if (!UsePerfData) return;
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51
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52 // create performance data that could not be created prior
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53 // to vm_init_globals() or otherwise have no logical home.
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54
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55 create_misc_perfdata();
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56
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57 // get copy of the sampled list
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58 _sampled = PerfDataManager::sampled();
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59
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60 }
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61
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62 /*
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63 * The engage() method is called at initialization time via
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64 * Thread::create_vm() to initialize the StatSampler and
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65 * register it with the WatcherThread as a periodic task.
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66 */
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67 void StatSampler::engage() {
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68
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69 if (!UsePerfData) return;
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70
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71 if (!is_active()) {
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72
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73 initialize();
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74
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75 // start up the periodic task
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76 _task = new StatSamplerTask(PerfDataSamplingInterval);
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77 _task->enroll();
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78 }
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79 }
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80
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81
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82 /*
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83 * the disengage() method is responsible for deactivating the periodic
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84 * task and, if logging was enabled, for logging the final sample. This
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85 * method is called from before_exit() in java.cpp and is only called
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86 * after the WatcherThread has been stopped.
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87 */
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88 void StatSampler::disengage() {
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89
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90 if (!UsePerfData) return;
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91
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92 if (!is_active())
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93 return;
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94
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95 // remove StatSamplerTask
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96 _task->disenroll();
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97 delete _task;
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98 _task = NULL;
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99
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100 // force a final sample
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101 sample_data(_sampled);
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102 }
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103
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104 /*
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105 * the destroy method is responsible for releasing any resources used by
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106 * the StatSampler prior to shutdown of the VM. this method is called from
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107 * before_exit() in java.cpp and is only called after the WatcherThread
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108 * has stopped.
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109 */
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110 void StatSampler::destroy() {
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111
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112 if (!UsePerfData) return;
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113
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114 if (_sampled != NULL) {
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115 delete(_sampled);
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116 _sampled = NULL;
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117 }
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118 }
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119
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120 /*
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121 * The sample_data() method is responsible for sampling the
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122 * the data value for each PerfData instance in the given list.
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123 */
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124 void StatSampler::sample_data(PerfDataList* list) {
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125
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126 assert(list != NULL, "null list unexpected");
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127
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128 for (int index = 0; index < list->length(); index++) {
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129 PerfData* item = list->at(index);
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130 item->sample();
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131 }
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132 }
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133
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134 /*
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135 * the collect_sample() method is the method invoked by the
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136 * WatcherThread via the PeriodicTask::task() method. This method
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137 * is responsible for collecting data samples from sampled
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138 * PerfData instances every PerfDataSamplingInterval milliseconds.
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139 * It is also responsible for logging the requested set of
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140 * PerfData instances every _sample_count milliseconds. While
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141 * logging data, it will output a column header after every _print_header
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142 * rows of data have been logged.
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143 */
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144 void StatSampler::collect_sample() {
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145
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146 // future - check for new PerfData objects. PerfData objects might
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147 // get added to the PerfDataManager lists after we have already
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148 // built our local copies.
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149 //
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150 // if (PerfDataManager::count() > previous) {
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151 // // get a new copy of the sampled list
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152 // if (_sampled != NULL) {
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153 // delete(_sampled);
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154 // _sampled = NULL;
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155 // }
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156 // _sampled = PerfDataManager::sampled();
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157 // }
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158
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159 assert(_sampled != NULL, "list not initialized");
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160
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161 sample_data(_sampled);
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162 }
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163
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164 /*
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165 * method to upcall into Java to return the value of the specified
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166 * property as a utf8 string, or NULL if does not exist. The caller
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167 * is responsible for setting a ResourceMark for proper cleanup of
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168 * the utf8 strings.
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169 */
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170 const char* StatSampler::get_system_property(const char* name, TRAPS) {
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171
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172 // setup the arguments to getProperty
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173 Handle key_str = java_lang_String::create_from_str(name, CHECK_NULL);
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174
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175 // return value
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176 JavaValue result(T_OBJECT);
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177
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178 // public static String getProperty(String key, String def);
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179 JavaCalls::call_static(&result,
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180 KlassHandle(THREAD, SystemDictionary::system_klass()),
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181 vmSymbolHandles::getProperty_name(),
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182 vmSymbolHandles::string_string_signature(),
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183 key_str,
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184 CHECK_NULL);
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185
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186 oop value_oop = (oop)result.get_jobject();
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187 if (value_oop == NULL) {
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188 return NULL;
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189 }
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190
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191 // convert Java String to utf8 string
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192 char* value = java_lang_String::as_utf8_string(value_oop);
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193
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194 return value;
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195 }
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196
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197 /*
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198 * The list of System Properties that have corresponding PerfData
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199 * string instrumentation created by retrieving the named property's
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200 * value from System.getProperty() and unconditionally creating a
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201 * PerfStringConstant object initialized to the retreived value. This
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202 * is not an exhustive list of Java properties with corresponding string
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203 * instrumentation as the create_system_property_instrumentation() method
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204 * creates other property based instrumentation conditionally.
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205 */
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206
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207 // stable interface, supported counters
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208 static const char* property_counters_ss[] = {
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209 "java.vm.specification.version",
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210 "java.vm.specification.name",
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211 "java.vm.specification.vendor",
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212 "java.vm.version",
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213 "java.vm.name",
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214 "java.vm.vendor",
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215 "java.vm.info",
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216 "java.library.path",
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217 "java.class.path",
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218 "java.endorsed.dirs",
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219 "java.ext.dirs",
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220 "java.home",
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221 NULL
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222 };
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223
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224 // unstable interface, supported counters
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225 static const char* property_counters_us[] = {
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226 NULL
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227 };
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228
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229 // unstable interface, unsupported counters
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230 static const char* property_counters_uu[] = {
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231 "sun.boot.class.path",
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232 "sun.boot.library.path",
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233 NULL
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234 };
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235
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236 typedef struct {
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237 const char** property_list;
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238 CounterNS name_space;
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239 } PropertyCounters;
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240
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241 static PropertyCounters property_counters[] = {
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242 { property_counters_ss, JAVA_PROPERTY },
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243 { property_counters_us, COM_PROPERTY },
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244 { property_counters_uu, SUN_PROPERTY },
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245 { NULL, SUN_PROPERTY }
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246 };
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247
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248
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249 /*
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250 * Method to create PerfData string instruments that contain the values
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251 * of various system properties. String instruments are created for each
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252 * property specified in the property lists provided in property_counters[].
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253 * Property counters have a counter name space prefix prepended to the
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254 * property name as indicated in property_counters[].
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255 */
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256 void StatSampler::create_system_property_instrumentation(TRAPS) {
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257
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258 ResourceMark rm;
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259
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260 for (int i = 0; property_counters[i].property_list != NULL; i++) {
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261
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262 for (int j = 0; property_counters[i].property_list[j] != NULL; j++) {
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263
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264 const char* property_name = property_counters[i].property_list[j];
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265 assert(property_name != NULL, "property name should not be NULL");
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266
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267 const char* value = get_system_property(property_name, CHECK);
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268
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269 // the property must exist
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270 assert(value != NULL, "property name should be valid");
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271
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272 if (value != NULL) {
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273 // create the property counter
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274 PerfDataManager::create_string_constant(property_counters[i].name_space,
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275 property_name, value, CHECK);
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276 }
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277 }
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278 }
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279 }
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280
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281 /*
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282 * The create_misc_perfdata() method provides a place to create
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283 * PerfData instances that would otherwise have no better place
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284 * to exist.
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285 */
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286 void StatSampler::create_misc_perfdata() {
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287
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288 ResourceMark rm;
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289 EXCEPTION_MARK;
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290
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291 // numeric constants
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292
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293 // frequency of the native high resolution timer
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294 PerfDataManager::create_constant(SUN_OS, "hrt.frequency",
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295 PerfData::U_Hertz, os::elapsed_frequency(),
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296 CHECK);
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297
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298 // string constants
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299
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300 // create string instrumentation for various Java properties.
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301 create_system_property_instrumentation(CHECK);
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302
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303 // hotspot flags (from .hotspotrc) and args (from command line)
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304 //
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305 PerfDataManager::create_string_constant(JAVA_RT, "vmFlags",
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306 Arguments::jvm_flags(), CHECK);
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307 PerfDataManager::create_string_constant(JAVA_RT, "vmArgs",
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308 Arguments::jvm_args(), CHECK);
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309
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310 // java class name/jar file and arguments to main class
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311 // note: name is cooridnated with launcher and Arguments.cpp
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312 PerfDataManager::create_string_constant(SUN_RT, "javaCommand",
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313 Arguments::java_command(), CHECK);
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314
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315 // the Java VM Internal version string
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316 PerfDataManager::create_string_constant(SUN_RT, "internalVersion",
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317 VM_Version::internal_vm_info_string(),
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318 CHECK);
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319
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320 // create sampled instrumentation objects
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321 create_sampled_perfdata();
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322 }
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323
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324 /*
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325 * helper class to provide for sampling of the elapsed_counter value
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326 * maintained in the OS class.
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327 */
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328 class HighResTimeSampler : public PerfSampleHelper {
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329 public:
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330 jlong take_sample() { return os::elapsed_counter(); }
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331 };
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332
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333 /*
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334 * the create_sampled_perdata() method provides a place to instantiate
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335 * sampled PerfData instances that would otherwise have no better place
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336 * to exist.
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337 */
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338 void StatSampler::create_sampled_perfdata() {
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339
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340 EXCEPTION_MARK;
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341
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342 // setup sampling of the elapsed time counter maintained in the
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343 // the os class. This counter can be used as either a time stamp
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344 // for each logged entry or as a liveness indicator for the VM.
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345 PerfSampleHelper* psh = new HighResTimeSampler();
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346 PerfDataManager::create_counter(SUN_OS, "hrt.ticks",
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347 PerfData::U_Ticks, psh, CHECK);
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348 }
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349
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350 /*
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351 * the statSampler_exit() function is called from os_init.cpp on
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352 * exit of the vm.
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353 */
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354 void statSampler_exit() {
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355
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356 if (!UsePerfData) return;
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357
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358 StatSampler::destroy();
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359 }
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