Mercurial > hg > graal-jvmci-8
diff src/share/vm/runtime/statSampler.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | f3a650d8df24 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/runtime/statSampler.cpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,359 @@ +/* + * Copyright 2001-2006 Sun Microsystems, Inc. All Rights Reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +# include "incls/_precompiled.incl" +# include "incls/_statSampler.cpp.incl" + +// -------------------------------------------------------- +// StatSamplerTask + +class StatSamplerTask : public PeriodicTask { + public: + StatSamplerTask(int interval_time) : PeriodicTask(interval_time) {} + void task() { StatSampler::collect_sample(); } +}; + + +//---------------------------------------------------------- +// Implementation of StatSampler + +StatSamplerTask* StatSampler::_task = NULL; +PerfDataList* StatSampler::_sampled = NULL; + +/* + * the initialize method is called from the engage() method + * and is responsible for initializing various global variables. + */ +void StatSampler::initialize() { + + if (!UsePerfData) return; + + // create performance data that could not be created prior + // to vm_init_globals() or otherwise have no logical home. + + create_misc_perfdata(); + + // get copy of the sampled list + _sampled = PerfDataManager::sampled(); + +} + +/* + * The engage() method is called at initialization time via + * Thread::create_vm() to initialize the StatSampler and + * register it with the WatcherThread as a periodic task. + */ +void StatSampler::engage() { + + if (!UsePerfData) return; + + if (!is_active()) { + + initialize(); + + // start up the periodic task + _task = new StatSamplerTask(PerfDataSamplingInterval); + _task->enroll(); + } +} + + +/* + * the disengage() method is responsible for deactivating the periodic + * task and, if logging was enabled, for logging the final sample. This + * method is called from before_exit() in java.cpp and is only called + * after the WatcherThread has been stopped. + */ +void StatSampler::disengage() { + + if (!UsePerfData) return; + + if (!is_active()) + return; + + // remove StatSamplerTask + _task->disenroll(); + delete _task; + _task = NULL; + + // force a final sample + sample_data(_sampled); +} + +/* + * the destroy method is responsible for releasing any resources used by + * the StatSampler prior to shutdown of the VM. this method is called from + * before_exit() in java.cpp and is only called after the WatcherThread + * has stopped. + */ +void StatSampler::destroy() { + + if (!UsePerfData) return; + + if (_sampled != NULL) { + delete(_sampled); + _sampled = NULL; + } +} + +/* + * The sample_data() method is responsible for sampling the + * the data value for each PerfData instance in the given list. + */ +void StatSampler::sample_data(PerfDataList* list) { + + assert(list != NULL, "null list unexpected"); + + for (int index = 0; index < list->length(); index++) { + PerfData* item = list->at(index); + item->sample(); + } +} + +/* + * the collect_sample() method is the method invoked by the + * WatcherThread via the PeriodicTask::task() method. This method + * is responsible for collecting data samples from sampled + * PerfData instances every PerfDataSamplingInterval milliseconds. + * It is also responsible for logging the requested set of + * PerfData instances every _sample_count milliseconds. While + * logging data, it will output a column header after every _print_header + * rows of data have been logged. + */ +void StatSampler::collect_sample() { + + // future - check for new PerfData objects. PerfData objects might + // get added to the PerfDataManager lists after we have already + // built our local copies. + // + // if (PerfDataManager::count() > previous) { + // // get a new copy of the sampled list + // if (_sampled != NULL) { + // delete(_sampled); + // _sampled = NULL; + // } + // _sampled = PerfDataManager::sampled(); + // } + + assert(_sampled != NULL, "list not initialized"); + + sample_data(_sampled); +} + +/* + * method to upcall into Java to return the value of the specified + * property as a utf8 string, or NULL if does not exist. The caller + * is responsible for setting a ResourceMark for proper cleanup of + * the utf8 strings. + */ +const char* StatSampler::get_system_property(const char* name, TRAPS) { + + // setup the arguments to getProperty + Handle key_str = java_lang_String::create_from_str(name, CHECK_NULL); + + // return value + JavaValue result(T_OBJECT); + + // public static String getProperty(String key, String def); + JavaCalls::call_static(&result, + KlassHandle(THREAD, SystemDictionary::system_klass()), + vmSymbolHandles::getProperty_name(), + vmSymbolHandles::string_string_signature(), + key_str, + CHECK_NULL); + + oop value_oop = (oop)result.get_jobject(); + if (value_oop == NULL) { + return NULL; + } + + // convert Java String to utf8 string + char* value = java_lang_String::as_utf8_string(value_oop); + + return value; +} + +/* + * The list of System Properties that have corresponding PerfData + * string instrumentation created by retrieving the named property's + * value from System.getProperty() and unconditionally creating a + * PerfStringConstant object initialized to the retreived value. This + * is not an exhustive list of Java properties with corresponding string + * instrumentation as the create_system_property_instrumentation() method + * creates other property based instrumentation conditionally. + */ + +// stable interface, supported counters +static const char* property_counters_ss[] = { + "java.vm.specification.version", + "java.vm.specification.name", + "java.vm.specification.vendor", + "java.vm.version", + "java.vm.name", + "java.vm.vendor", + "java.vm.info", + "java.library.path", + "java.class.path", + "java.endorsed.dirs", + "java.ext.dirs", + "java.home", + NULL +}; + +// unstable interface, supported counters +static const char* property_counters_us[] = { + NULL +}; + +// unstable interface, unsupported counters +static const char* property_counters_uu[] = { + "sun.boot.class.path", + "sun.boot.library.path", + NULL +}; + +typedef struct { + const char** property_list; + CounterNS name_space; +} PropertyCounters; + +static PropertyCounters property_counters[] = { + { property_counters_ss, JAVA_PROPERTY }, + { property_counters_us, COM_PROPERTY }, + { property_counters_uu, SUN_PROPERTY }, + { NULL, SUN_PROPERTY } +}; + + +/* + * Method to create PerfData string instruments that contain the values + * of various system properties. String instruments are created for each + * property specified in the property lists provided in property_counters[]. + * Property counters have a counter name space prefix prepended to the + * property name as indicated in property_counters[]. + */ +void StatSampler::create_system_property_instrumentation(TRAPS) { + + ResourceMark rm; + + for (int i = 0; property_counters[i].property_list != NULL; i++) { + + for (int j = 0; property_counters[i].property_list[j] != NULL; j++) { + + const char* property_name = property_counters[i].property_list[j]; + assert(property_name != NULL, "property name should not be NULL"); + + const char* value = get_system_property(property_name, CHECK); + + // the property must exist + assert(value != NULL, "property name should be valid"); + + if (value != NULL) { + // create the property counter + PerfDataManager::create_string_constant(property_counters[i].name_space, + property_name, value, CHECK); + } + } + } +} + +/* + * The create_misc_perfdata() method provides a place to create + * PerfData instances that would otherwise have no better place + * to exist. + */ +void StatSampler::create_misc_perfdata() { + + ResourceMark rm; + EXCEPTION_MARK; + + // numeric constants + + // frequency of the native high resolution timer + PerfDataManager::create_constant(SUN_OS, "hrt.frequency", + PerfData::U_Hertz, os::elapsed_frequency(), + CHECK); + + // string constants + + // create string instrumentation for various Java properties. + create_system_property_instrumentation(CHECK); + + // hotspot flags (from .hotspotrc) and args (from command line) + // + PerfDataManager::create_string_constant(JAVA_RT, "vmFlags", + Arguments::jvm_flags(), CHECK); + PerfDataManager::create_string_constant(JAVA_RT, "vmArgs", + Arguments::jvm_args(), CHECK); + + // java class name/jar file and arguments to main class + // note: name is cooridnated with launcher and Arguments.cpp + PerfDataManager::create_string_constant(SUN_RT, "javaCommand", + Arguments::java_command(), CHECK); + + // the Java VM Internal version string + PerfDataManager::create_string_constant(SUN_RT, "internalVersion", + VM_Version::internal_vm_info_string(), + CHECK); + + // create sampled instrumentation objects + create_sampled_perfdata(); +} + +/* + * helper class to provide for sampling of the elapsed_counter value + * maintained in the OS class. + */ +class HighResTimeSampler : public PerfSampleHelper { + public: + jlong take_sample() { return os::elapsed_counter(); } +}; + +/* + * the create_sampled_perdata() method provides a place to instantiate + * sampled PerfData instances that would otherwise have no better place + * to exist. + */ +void StatSampler::create_sampled_perfdata() { + + EXCEPTION_MARK; + + // setup sampling of the elapsed time counter maintained in the + // the os class. This counter can be used as either a time stamp + // for each logged entry or as a liveness indicator for the VM. + PerfSampleHelper* psh = new HighResTimeSampler(); + PerfDataManager::create_counter(SUN_OS, "hrt.ticks", + PerfData::U_Ticks, psh, CHECK); +} + +/* + * the statSampler_exit() function is called from os_init.cpp on + * exit of the vm. + */ +void statSampler_exit() { + + if (!UsePerfData) return; + + StatSampler::destroy(); +}