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

 /*

  * Copyright (c) 2011, 2012, 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();

   // stat is deallocated inside GCNotificationRequest

   GCStatInfo* stat = new(ResourceObj::C_HEAP, mtGC) 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) {

   Klass* 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

   Klass* mu_klass = Management::java_lang_management_MemoryUsage_klass(CHECK_NH);

   instanceKlassHandle mu_kh(THREAD, mu_klass);

   // The array allocations below should use a handle containing mu_klass

   // as the first allocation could trigger a GC, causing the actual

   // klass oop to move, and leaving mu_klass pointing to the old

   // location.

   objArrayOop bu = oopFactory::new_objArray(mu_kh(), MemoryService::num_memory_pools(), CHECK_NH);

   objArrayHandle usage_before_gc_ah(THREAD, bu);

   objArrayOop au = oopFactory::new_objArray(mu_kh(), 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);

   Klass* 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());

   Klass* 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(Management::ticks_to_ms(gcStatInfo->start_time()));

   constructor_args.push_long(Management::ticks_to_ms(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) {

   GCNotifier::sendNotificationInternal(THREAD);

   // Clearing pending exception to avoid premature termination of

   // the service thread

   if (HAS_PENDING_EXCEPTION) {

     CLEAR_PENDING_EXCEPTION;

   }

 }

 class NotificationMark : public StackObj {

   // This class is used in GCNotifier::sendNotificationInternal to ensure that

   // the GCNotificationRequest object is properly cleaned up, whatever path

   // is used to exit the method.

   GCNotificationRequest* _request;

 public:

   NotificationMark(GCNotificationRequest* r) {

     _request = r;

   }

   ~NotificationMark() {

     assert(_request != NULL, "Sanity check");

     delete _request;

   }

 };

 void GCNotifier::sendNotificationInternal(TRAPS) {

   ResourceMark rm(THREAD);

   HandleMark hm(THREAD);

   GCNotificationRequest *request = getRequest();

   if (request != NULL) {

     NotificationMark nm(request);

     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);

     Klass* 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);

   }

 }