jdk8-mips64-public/hotspot: src/share/vm/services/gcNotifier.cpp@78542e2b5e35 (annotated)

src/share/vm/services/gcNotifier.cpp@78542e2b5e35 (annotated)

src/share/vm/services/gcNotifier.cpp

Thu, 12 May 2011 10:30:11 -0700

author: fparain
date: Thu, 12 May 2011 10:30:11 -0700
changeset 2888: 78542e2b5e35
child 3027: 87e40b34bc2b
permissions: -rw-r--r--

7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
Summary: Add a notification to the GarbageCollectorMXBeans
Reviewed-by: acorn, mchung

 /*
  * Copyright (c) 2011, 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 "oops/oop.inline.hpp"
 #include "runtime/interfaceSupport.hpp"
 #include "runtime/java.hpp"
 #include "runtime/javaCalls.hpp"
 #include "runtime/mutex.hpp"
 #include "runtime/mutexLocker.hpp"
 #include "services/gcNotifier.hpp"
 #include "services/management.hpp"
 #include "services/memoryService.hpp"
 #include "memoryManager.hpp"
 #include "memory/oopFactory.hpp"
 GCNotificationRequest *GCNotifier::first_request = NULL;
 GCNotificationRequest *GCNotifier::last_request = NULL;
 void GCNotifier::pushNotification(GCMemoryManager *mgr, const char *action, const char *cause) {
   // Make a copy of the last GC statistics
   // GC may occur between now and the creation of the notification
   int num_pools = MemoryService::num_memory_pools();
   GCStatInfo* stat = new GCStatInfo(num_pools);
   mgr->get_last_gc_stat(stat);
   GCNotificationRequest *request = new GCNotificationRequest(os::javaTimeMillis(),mgr,action,cause,stat);
   addRequest(request);
  }
 void GCNotifier::addRequest(GCNotificationRequest *request) {
   MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
   if(first_request == NULL) {
     first_request = request;
   } else {
     last_request->next = request;
   }
   last_request = request;
   Service_lock->notify_all();
 }
 GCNotificationRequest *GCNotifier::getRequest() {
   MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
   GCNotificationRequest *request = first_request;
   if(first_request != NULL) {
     first_request = first_request->next;
   }
   return request;
 }
 bool GCNotifier::has_event() {
   return first_request != NULL;
 }
 static Handle getGcInfoBuilder(GCMemoryManager *gcManager,TRAPS) {
   klassOop k = Management::sun_management_GarbageCollectorImpl_klass(CHECK_NH);
   instanceKlassHandle gcMBeanKlass (THREAD, k);
   instanceOop i = gcManager->get_memory_manager_instance(THREAD);
   instanceHandle ih(THREAD, i);
   JavaValue result(T_OBJECT);
   JavaCallArguments args(ih);
   JavaCalls::call_virtual(&result,
                           gcMBeanKlass,
                           vmSymbols::getGcInfoBuilder_name(),
                           vmSymbols::getGcInfoBuilder_signature(),
                           &args,
                           CHECK_NH);
   return Handle(THREAD,(oop)result.get_jobject());
 }
 static Handle createGcInfo(GCMemoryManager *gcManager, GCStatInfo *gcStatInfo,TRAPS) {
   // Fill the arrays of MemoryUsage objects with before and after GC
   // per pool memory usage
   klassOop muKlass = Management::java_lang_management_MemoryUsage_klass(CHECK_NH);   objArrayOop bu = oopFactory::new_objArray( muKlass,MemoryService::num_memory_pools(), CHECK_NH);
   objArrayHandle usage_before_gc_ah(THREAD, bu);
   objArrayOop au = oopFactory::new_objArray(muKlass,MemoryService::num_memory_pools(), CHECK_NH);
   objArrayHandle usage_after_gc_ah(THREAD, au);
   for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
     Handle before_usage = MemoryService::create_MemoryUsage_obj(gcStatInfo->before_gc_usage_for_pool(i), CHECK_NH);
     Handle after_usage;
     MemoryUsage u = gcStatInfo->after_gc_usage_for_pool(i);
     if (u.max_size() == 0 && u.used() > 0) {
       // If max size == 0, this pool is a survivor space.
       // Set max size = -1 since the pools will be swapped after GC.
       MemoryUsage usage(u.init_size(), u.used(), u.committed(), (size_t)-1);
       after_usage = MemoryService::create_MemoryUsage_obj(usage, CHECK_NH);
     } else {
         after_usage = MemoryService::create_MemoryUsage_obj(u, CHECK_NH);
     }
     usage_before_gc_ah->obj_at_put(i, before_usage());
     usage_after_gc_ah->obj_at_put(i, after_usage());
   }
   // Current implementation only has 1 attribute (number of GC threads)
   // The type is 'I'
   objArrayOop extra_args_array = oopFactory::new_objArray(SystemDictionary::Integer_klass(), 1, CHECK_NH);
   objArrayHandle extra_array (THREAD, extra_args_array);
   klassOop itKlass= SystemDictionary::Integer_klass();
   instanceKlassHandle intK(THREAD, itKlass);
   instanceHandle extra_arg_val = intK->allocate_instance_handle(CHECK_NH);
   {
     JavaValue res(T_VOID);
     JavaCallArguments argsInt;
     argsInt.push_oop(extra_arg_val);
     argsInt.push_int(gcManager->num_gc_threads());
     JavaCalls::call_special(&res,
                             intK,
                             vmSymbols::object_initializer_name(),
                             vmSymbols::int_void_signature(),
                             &argsInt,
                             CHECK_NH);
   }
   extra_array->obj_at_put(0,extra_arg_val());
   klassOop gcInfoklass = Management::com_sun_management_GcInfo_klass(CHECK_NH);
   instanceKlassHandle ik (THREAD,gcInfoklass);
   Handle gcInfo_instance = ik->allocate_instance_handle(CHECK_NH);
   JavaValue constructor_result(T_VOID);
   JavaCallArguments constructor_args(16);
   constructor_args.push_oop(gcInfo_instance);
   constructor_args.push_oop(getGcInfoBuilder(gcManager,THREAD));
   constructor_args.push_long(gcStatInfo->gc_index());
   constructor_args.push_long(gcStatInfo->start_time());
   constructor_args.push_long(gcStatInfo->end_time());
   constructor_args.push_oop(usage_before_gc_ah);
   constructor_args.push_oop(usage_after_gc_ah);
   constructor_args.push_oop(extra_array);
   JavaCalls::call_special(&constructor_result,
                           ik,
                           vmSymbols::object_initializer_name(),
                           vmSymbols::com_sun_management_GcInfo_constructor_signature(),
                           &constructor_args,
                           CHECK_NH);
   return Handle(gcInfo_instance());
 }
 void GCNotifier::sendNotification(TRAPS) {
   ResourceMark rm(THREAD);
   GCNotificationRequest *request = getRequest();
   if(request != NULL) {
     Handle objGcInfo = createGcInfo(request->gcManager,request->gcStatInfo,THREAD);
     Handle objName = java_lang_String::create_from_platform_dependent_str(request->gcManager->name(), CHECK);
     Handle objAction = java_lang_String::create_from_platform_dependent_str(request->gcAction, CHECK);
     Handle objCause = java_lang_String::create_from_platform_dependent_str(request->gcCause, CHECK);
     klassOop k = Management::sun_management_GarbageCollectorImpl_klass(CHECK);
     instanceKlassHandle gc_mbean_klass (THREAD, k);
     instanceOop gc_mbean = request->gcManager->get_memory_manager_instance(THREAD);
     instanceHandle gc_mbean_h(THREAD, gc_mbean);
     if (!gc_mbean_h->is_a(k)) {
       THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
                 "This GCMemoryManager doesn't have a GarbageCollectorMXBean");
     }
     JavaValue result(T_VOID);
     JavaCallArguments args(gc_mbean_h);
     args.push_long(request->timestamp);
     args.push_oop(objName);
     args.push_oop(objAction);
     args.push_oop(objCause);
     args.push_oop(objGcInfo);
     JavaCalls::call_virtual(&result,
                             gc_mbean_klass,
                             vmSymbols::createGCNotification_name(),
                             vmSymbols::createGCNotification_signature(),
                             &args,
                             CHECK);
     if (HAS_PENDING_EXCEPTION) {
       CLEAR_PENDING_EXCEPTION;
     }
     delete request;
   }
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/services/gcNotifier.cpp@78542e2b5e35 (annotated)

src/share/vm/services/gcNotifier.cpp