| /* |
| * Copyright (c) 2001, 2017, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "classfile/systemDictionary.hpp" |
| #include "classfile/vmSymbols.hpp" |
| #include "memory/allocation.inline.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "oops/oop.inline.hpp" |
| #include "runtime/arguments.hpp" |
| #include "runtime/java.hpp" |
| #include "runtime/javaCalls.hpp" |
| #include "runtime/os.hpp" |
| #include "runtime/statSampler.hpp" |
| #include "runtime/vm_version.hpp" |
| |
| // -------------------------------------------------------- |
| // 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, |
| SystemDictionary::System_klass(), |
| vmSymbols::getProperty_name(), |
| vmSymbols::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 retrieved value. This |
| * is not an exhaustive 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", |
| "jdk.debug", |
| "java.library.path", |
| "java.class.path", |
| "java.version", |
| "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.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(); |
| } |