jdk8-mips64-public/hotspot: src/share/vm/runtime/statSampler.cpp@36c186bcc085 (annotated)

src/share/vm/runtime/statSampler.cpp@36c186bcc085 (annotated)

src/share/vm/runtime/statSampler.cpp

Mon, 03 Jan 2011 14:09:11 -0500

author: coleenp
date: Mon, 03 Jan 2011 14:09:11 -0500
changeset 2418: 36c186bcc085
parent 2314: f95d63e2154a
child 2497: 3582bf76420e
permissions: -rw-r--r--

6302804: Hotspot VM dies ungraceful death when C heap is exhausted in various places.
Summary: enhance the error reporting mechanism to help user to fix the problem rather than making it look like a VM error.
Reviewed-by: kvn, kamg

 /*
  * Copyright (c) 2001, 2010, 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"
 #ifdef TARGET_ARCH_x86
 # include "vm_version_x86.hpp"
 #endif
 #ifdef TARGET_ARCH_sparc
 # include "vm_version_sparc.hpp"
 #endif
 #ifdef TARGET_ARCH_zero
 # include "vm_version_zero.hpp"
 #endif
 // --------------------------------------------------------
 // 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();
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/runtime/statSampler.cpp@36c186bcc085 (annotated)

src/share/vm/runtime/statSampler.cpp