author | coleenp |
Thu, 27 Jan 2011 16:11:27 -0800 | |
changeset 8076 | 96d498ec7ae1 |
parent 7397 | 5b173b4ca846 |
child 8107 | 78e5bd944384 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#include "precompiled.hpp" |
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#include "classfile/systemDictionary.hpp" |
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#include "classfile/vmSymbols.hpp" |
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#include "memory/allocation.inline.hpp" |
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#include "memory/resourceArea.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/arguments.hpp" |
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#include "runtime/java.hpp" |
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#include "runtime/javaCalls.hpp" |
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#include "runtime/os.hpp" |
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#include "runtime/statSampler.hpp" |
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#ifdef TARGET_ARCH_x86 |
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# include "vm_version_x86.hpp" |
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#endif |
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#ifdef TARGET_ARCH_sparc |
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# include "vm_version_sparc.hpp" |
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#endif |
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#ifdef TARGET_ARCH_zero |
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# include "vm_version_zero.hpp" |
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#endif |
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// -------------------------------------------------------- |
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// StatSamplerTask |
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class StatSamplerTask : public PeriodicTask { |
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public: |
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StatSamplerTask(int interval_time) : PeriodicTask(interval_time) {} |
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void task() { StatSampler::collect_sample(); } |
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}; |
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//---------------------------------------------------------- |
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// Implementation of StatSampler |
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StatSamplerTask* StatSampler::_task = NULL; |
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PerfDataList* StatSampler::_sampled = NULL; |
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/* |
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* the initialize method is called from the engage() method |
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* and is responsible for initializing various global variables. |
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*/ |
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void StatSampler::initialize() { |
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if (!UsePerfData) return; |
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// create performance data that could not be created prior |
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// to vm_init_globals() or otherwise have no logical home. |
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create_misc_perfdata(); |
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// get copy of the sampled list |
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_sampled = PerfDataManager::sampled(); |
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} |
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/* |
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* The engage() method is called at initialization time via |
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* Thread::create_vm() to initialize the StatSampler and |
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* register it with the WatcherThread as a periodic task. |
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*/ |
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void StatSampler::engage() { |
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if (!UsePerfData) return; |
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if (!is_active()) { |
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initialize(); |
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// start up the periodic task |
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_task = new StatSamplerTask(PerfDataSamplingInterval); |
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_task->enroll(); |
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} |
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} |
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/* |
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* the disengage() method is responsible for deactivating the periodic |
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* task and, if logging was enabled, for logging the final sample. This |
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* method is called from before_exit() in java.cpp and is only called |
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* after the WatcherThread has been stopped. |
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*/ |
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void StatSampler::disengage() { |
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if (!UsePerfData) return; |
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if (!is_active()) |
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return; |
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// remove StatSamplerTask |
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_task->disenroll(); |
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delete _task; |
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_task = NULL; |
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// force a final sample |
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sample_data(_sampled); |
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} |
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/* |
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* the destroy method is responsible for releasing any resources used by |
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* the StatSampler prior to shutdown of the VM. this method is called from |
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* before_exit() in java.cpp and is only called after the WatcherThread |
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* has stopped. |
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*/ |
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void StatSampler::destroy() { |
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if (!UsePerfData) return; |
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if (_sampled != NULL) { |
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delete(_sampled); |
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_sampled = NULL; |
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} |
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} |
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/* |
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* The sample_data() method is responsible for sampling the |
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* the data value for each PerfData instance in the given list. |
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*/ |
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void StatSampler::sample_data(PerfDataList* list) { |
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assert(list != NULL, "null list unexpected"); |
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for (int index = 0; index < list->length(); index++) { |
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PerfData* item = list->at(index); |
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item->sample(); |
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} |
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} |
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/* |
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* the collect_sample() method is the method invoked by the |
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* WatcherThread via the PeriodicTask::task() method. This method |
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* is responsible for collecting data samples from sampled |
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* PerfData instances every PerfDataSamplingInterval milliseconds. |
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* It is also responsible for logging the requested set of |
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* PerfData instances every _sample_count milliseconds. While |
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* logging data, it will output a column header after every _print_header |
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* rows of data have been logged. |
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*/ |
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void StatSampler::collect_sample() { |
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// future - check for new PerfData objects. PerfData objects might |
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// get added to the PerfDataManager lists after we have already |
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// built our local copies. |
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// |
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// if (PerfDataManager::count() > previous) { |
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// // get a new copy of the sampled list |
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// if (_sampled != NULL) { |
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// delete(_sampled); |
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// _sampled = NULL; |
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// } |
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// _sampled = PerfDataManager::sampled(); |
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// } |
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assert(_sampled != NULL, "list not initialized"); |
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sample_data(_sampled); |
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} |
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/* |
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* method to upcall into Java to return the value of the specified |
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* property as a utf8 string, or NULL if does not exist. The caller |
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* is responsible for setting a ResourceMark for proper cleanup of |
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* the utf8 strings. |
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*/ |
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const char* StatSampler::get_system_property(const char* name, TRAPS) { |
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// setup the arguments to getProperty |
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Handle key_str = java_lang_String::create_from_str(name, CHECK_NULL); |
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// return value |
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JavaValue result(T_OBJECT); |
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// public static String getProperty(String key, String def); |
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JavaCalls::call_static(&result, |
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KlassHandle(THREAD, SystemDictionary::System_klass()), |
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vmSymbols::getProperty_name(), |
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vmSymbols::string_string_signature(), |
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key_str, |
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CHECK_NULL); |
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oop value_oop = (oop)result.get_jobject(); |
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if (value_oop == NULL) { |
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return NULL; |
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} |
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// convert Java String to utf8 string |
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char* value = java_lang_String::as_utf8_string(value_oop); |
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return value; |
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} |
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/* |
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* The list of System Properties that have corresponding PerfData |
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* string instrumentation created by retrieving the named property's |
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* value from System.getProperty() and unconditionally creating a |
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* PerfStringConstant object initialized to the retreived value. This |
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* is not an exhustive list of Java properties with corresponding string |
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* instrumentation as the create_system_property_instrumentation() method |
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* creates other property based instrumentation conditionally. |
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*/ |
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// stable interface, supported counters |
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static const char* property_counters_ss[] = { |
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"java.vm.specification.version", |
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"java.vm.specification.name", |
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"java.vm.specification.vendor", |
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"java.vm.version", |
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"java.vm.name", |
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"java.vm.vendor", |
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"java.vm.info", |
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"java.library.path", |
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"java.class.path", |
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"java.endorsed.dirs", |
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"java.ext.dirs", |
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"java.version", |
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"java.home", |
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NULL |
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}; |
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// unstable interface, supported counters |
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static const char* property_counters_us[] = { |
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NULL |
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}; |
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// unstable interface, unsupported counters |
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static const char* property_counters_uu[] = { |
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"sun.boot.class.path", |
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"sun.boot.library.path", |
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NULL |
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}; |
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typedef struct { |
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const char** property_list; |
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CounterNS name_space; |
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} PropertyCounters; |
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static PropertyCounters property_counters[] = { |
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{ property_counters_ss, JAVA_PROPERTY }, |
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{ property_counters_us, COM_PROPERTY }, |
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{ property_counters_uu, SUN_PROPERTY }, |
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{ NULL, SUN_PROPERTY } |
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}; |
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/* |
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* Method to create PerfData string instruments that contain the values |
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* of various system properties. String instruments are created for each |
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* property specified in the property lists provided in property_counters[]. |
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* Property counters have a counter name space prefix prepended to the |
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* property name as indicated in property_counters[]. |
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*/ |
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void StatSampler::create_system_property_instrumentation(TRAPS) { |
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ResourceMark rm; |
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for (int i = 0; property_counters[i].property_list != NULL; i++) { |
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for (int j = 0; property_counters[i].property_list[j] != NULL; j++) { |
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const char* property_name = property_counters[i].property_list[j]; |
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assert(property_name != NULL, "property name should not be NULL"); |
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const char* value = get_system_property(property_name, CHECK); |
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// the property must exist |
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assert(value != NULL, "property name should be valid"); |
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if (value != NULL) { |
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// create the property counter |
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PerfDataManager::create_string_constant(property_counters[i].name_space, |
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property_name, value, CHECK); |
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} |
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} |
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} |
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} |
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/* |
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* The create_misc_perfdata() method provides a place to create |
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* PerfData instances that would otherwise have no better place |
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* to exist. |
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*/ |
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void StatSampler::create_misc_perfdata() { |
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ResourceMark rm; |
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EXCEPTION_MARK; |
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// numeric constants |
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// frequency of the native high resolution timer |
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PerfDataManager::create_constant(SUN_OS, "hrt.frequency", |
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PerfData::U_Hertz, os::elapsed_frequency(), |
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CHECK); |
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// string constants |
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// create string instrumentation for various Java properties. |
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create_system_property_instrumentation(CHECK); |
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// hotspot flags (from .hotspotrc) and args (from command line) |
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// |
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PerfDataManager::create_string_constant(JAVA_RT, "vmFlags", |
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Arguments::jvm_flags(), CHECK); |
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PerfDataManager::create_string_constant(JAVA_RT, "vmArgs", |
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Arguments::jvm_args(), CHECK); |
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// java class name/jar file and arguments to main class |
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// note: name is cooridnated with launcher and Arguments.cpp |
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PerfDataManager::create_string_constant(SUN_RT, "javaCommand", |
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Arguments::java_command(), CHECK); |
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// the Java VM Internal version string |
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PerfDataManager::create_string_constant(SUN_RT, "internalVersion", |
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VM_Version::internal_vm_info_string(), |
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CHECK); |
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// create sampled instrumentation objects |
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create_sampled_perfdata(); |
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} |
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/* |
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* helper class to provide for sampling of the elapsed_counter value |
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* maintained in the OS class. |
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*/ |
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class HighResTimeSampler : public PerfSampleHelper { |
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public: |
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jlong take_sample() { return os::elapsed_counter(); } |
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}; |
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/* |
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* the create_sampled_perdata() method provides a place to instantiate |
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* sampled PerfData instances that would otherwise have no better place |
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* to exist. |
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*/ |
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void StatSampler::create_sampled_perfdata() { |
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EXCEPTION_MARK; |
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// setup sampling of the elapsed time counter maintained in the |
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// the os class. This counter can be used as either a time stamp |
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// for each logged entry or as a liveness indicator for the VM. |
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PerfSampleHelper* psh = new HighResTimeSampler(); |
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PerfDataManager::create_counter(SUN_OS, "hrt.ticks", |
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PerfData::U_Ticks, psh, CHECK); |
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} |
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/* |
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* the statSampler_exit() function is called from os_init.cpp on |
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* exit of the vm. |
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*/ |
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void statSampler_exit() { |
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if (!UsePerfData) return; |
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StatSampler::destroy(); |
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} |