Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright 2001-2008 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.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.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();

 }