1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/services/gcNotifier.cpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,244 @@
1.4 +/*
1.5 + * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "precompiled.hpp"
1.29 +#include "classfile/systemDictionary.hpp"
1.30 +#include "classfile/vmSymbols.hpp"
1.31 +#include "oops/oop.inline.hpp"
1.32 +#include "runtime/interfaceSupport.hpp"
1.33 +#include "runtime/java.hpp"
1.34 +#include "runtime/javaCalls.hpp"
1.35 +#include "runtime/mutex.hpp"
1.36 +#include "runtime/mutexLocker.hpp"
1.37 +#include "services/gcNotifier.hpp"
1.38 +#include "services/management.hpp"
1.39 +#include "services/memoryService.hpp"
1.40 +#include "memoryManager.hpp"
1.41 +#include "memory/oopFactory.hpp"
1.42 +
1.43 +GCNotificationRequest *GCNotifier::first_request = NULL;
1.44 +GCNotificationRequest *GCNotifier::last_request = NULL;
1.45 +
1.46 +void GCNotifier::pushNotification(GCMemoryManager *mgr, const char *action, const char *cause) {
1.47 + // Make a copy of the last GC statistics
1.48 + // GC may occur between now and the creation of the notification
1.49 + int num_pools = MemoryService::num_memory_pools();
1.50 + // stat is deallocated inside GCNotificationRequest
1.51 + GCStatInfo* stat = new(ResourceObj::C_HEAP, mtGC) GCStatInfo(num_pools);
1.52 + mgr->get_last_gc_stat(stat);
1.53 + GCNotificationRequest *request = new GCNotificationRequest(os::javaTimeMillis(),mgr,action,cause,stat);
1.54 + addRequest(request);
1.55 + }
1.56 +
1.57 +void GCNotifier::addRequest(GCNotificationRequest *request) {
1.58 + MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1.59 + if(first_request == NULL) {
1.60 + first_request = request;
1.61 + } else {
1.62 + last_request->next = request;
1.63 + }
1.64 + last_request = request;
1.65 + Service_lock->notify_all();
1.66 +}
1.67 +
1.68 +GCNotificationRequest *GCNotifier::getRequest() {
1.69 + MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1.70 + GCNotificationRequest *request = first_request;
1.71 + if(first_request != NULL) {
1.72 + first_request = first_request->next;
1.73 + }
1.74 + return request;
1.75 +}
1.76 +
1.77 +bool GCNotifier::has_event() {
1.78 + return first_request != NULL;
1.79 +}
1.80 +
1.81 +static Handle getGcInfoBuilder(GCMemoryManager *gcManager,TRAPS) {
1.82 +
1.83 + Klass* k = Management::sun_management_GarbageCollectorImpl_klass(CHECK_NH);
1.84 + instanceKlassHandle gcMBeanKlass (THREAD, k);
1.85 +
1.86 + instanceOop i = gcManager->get_memory_manager_instance(THREAD);
1.87 + instanceHandle ih(THREAD, i);
1.88 +
1.89 + JavaValue result(T_OBJECT);
1.90 + JavaCallArguments args(ih);
1.91 +
1.92 + JavaCalls::call_virtual(&result,
1.93 + gcMBeanKlass,
1.94 + vmSymbols::getGcInfoBuilder_name(),
1.95 + vmSymbols::getGcInfoBuilder_signature(),
1.96 + &args,
1.97 + CHECK_NH);
1.98 + return Handle(THREAD,(oop)result.get_jobject());
1.99 +}
1.100 +
1.101 +static Handle createGcInfo(GCMemoryManager *gcManager, GCStatInfo *gcStatInfo,TRAPS) {
1.102 +
1.103 + // Fill the arrays of MemoryUsage objects with before and after GC
1.104 + // per pool memory usage
1.105 +
1.106 + Klass* mu_klass = Management::java_lang_management_MemoryUsage_klass(CHECK_NH);
1.107 + instanceKlassHandle mu_kh(THREAD, mu_klass);
1.108 +
1.109 + // The array allocations below should use a handle containing mu_klass
1.110 + // as the first allocation could trigger a GC, causing the actual
1.111 + // klass oop to move, and leaving mu_klass pointing to the old
1.112 + // location.
1.113 + objArrayOop bu = oopFactory::new_objArray(mu_kh(), MemoryService::num_memory_pools(), CHECK_NH);
1.114 + objArrayHandle usage_before_gc_ah(THREAD, bu);
1.115 + objArrayOop au = oopFactory::new_objArray(mu_kh(), MemoryService::num_memory_pools(), CHECK_NH);
1.116 + objArrayHandle usage_after_gc_ah(THREAD, au);
1.117 +
1.118 + for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
1.119 + Handle before_usage = MemoryService::create_MemoryUsage_obj(gcStatInfo->before_gc_usage_for_pool(i), CHECK_NH);
1.120 + Handle after_usage;
1.121 +
1.122 + MemoryUsage u = gcStatInfo->after_gc_usage_for_pool(i);
1.123 + if (u.max_size() == 0 && u.used() > 0) {
1.124 + // If max size == 0, this pool is a survivor space.
1.125 + // Set max size = -1 since the pools will be swapped after GC.
1.126 + MemoryUsage usage(u.init_size(), u.used(), u.committed(), (size_t)-1);
1.127 + after_usage = MemoryService::create_MemoryUsage_obj(usage, CHECK_NH);
1.128 + } else {
1.129 + after_usage = MemoryService::create_MemoryUsage_obj(u, CHECK_NH);
1.130 + }
1.131 + usage_before_gc_ah->obj_at_put(i, before_usage());
1.132 + usage_after_gc_ah->obj_at_put(i, after_usage());
1.133 + }
1.134 +
1.135 + // Current implementation only has 1 attribute (number of GC threads)
1.136 + // The type is 'I'
1.137 + objArrayOop extra_args_array = oopFactory::new_objArray(SystemDictionary::Integer_klass(), 1, CHECK_NH);
1.138 + objArrayHandle extra_array (THREAD, extra_args_array);
1.139 + Klass* itKlass = SystemDictionary::Integer_klass();
1.140 + instanceKlassHandle intK(THREAD, itKlass);
1.141 +
1.142 + instanceHandle extra_arg_val = intK->allocate_instance_handle(CHECK_NH);
1.143 +
1.144 + {
1.145 + JavaValue res(T_VOID);
1.146 + JavaCallArguments argsInt;
1.147 + argsInt.push_oop(extra_arg_val);
1.148 + argsInt.push_int(gcManager->num_gc_threads());
1.149 +
1.150 + JavaCalls::call_special(&res,
1.151 + intK,
1.152 + vmSymbols::object_initializer_name(),
1.153 + vmSymbols::int_void_signature(),
1.154 + &argsInt,
1.155 + CHECK_NH);
1.156 + }
1.157 + extra_array->obj_at_put(0,extra_arg_val());
1.158 +
1.159 + Klass* gcInfoklass = Management::com_sun_management_GcInfo_klass(CHECK_NH);
1.160 + instanceKlassHandle ik(THREAD, gcInfoklass);
1.161 +
1.162 + Handle gcInfo_instance = ik->allocate_instance_handle(CHECK_NH);
1.163 +
1.164 + JavaValue constructor_result(T_VOID);
1.165 + JavaCallArguments constructor_args(16);
1.166 + constructor_args.push_oop(gcInfo_instance);
1.167 + constructor_args.push_oop(getGcInfoBuilder(gcManager,THREAD));
1.168 + constructor_args.push_long(gcStatInfo->gc_index());
1.169 + constructor_args.push_long(Management::ticks_to_ms(gcStatInfo->start_time()));
1.170 + constructor_args.push_long(Management::ticks_to_ms(gcStatInfo->end_time()));
1.171 + constructor_args.push_oop(usage_before_gc_ah);
1.172 + constructor_args.push_oop(usage_after_gc_ah);
1.173 + constructor_args.push_oop(extra_array);
1.174 +
1.175 + JavaCalls::call_special(&constructor_result,
1.176 + ik,
1.177 + vmSymbols::object_initializer_name(),
1.178 + vmSymbols::com_sun_management_GcInfo_constructor_signature(),
1.179 + &constructor_args,
1.180 + CHECK_NH);
1.181 +
1.182 + return Handle(gcInfo_instance());
1.183 +}
1.184 +
1.185 +void GCNotifier::sendNotification(TRAPS) {
1.186 + GCNotifier::sendNotificationInternal(THREAD);
1.187 + // Clearing pending exception to avoid premature termination of
1.188 + // the service thread
1.189 + if (HAS_PENDING_EXCEPTION) {
1.190 + CLEAR_PENDING_EXCEPTION;
1.191 + }
1.192 +}
1.193 +
1.194 +class NotificationMark : public StackObj {
1.195 + // This class is used in GCNotifier::sendNotificationInternal to ensure that
1.196 + // the GCNotificationRequest object is properly cleaned up, whatever path
1.197 + // is used to exit the method.
1.198 + GCNotificationRequest* _request;
1.199 +public:
1.200 + NotificationMark(GCNotificationRequest* r) {
1.201 + _request = r;
1.202 + }
1.203 + ~NotificationMark() {
1.204 + assert(_request != NULL, "Sanity check");
1.205 + delete _request;
1.206 + }
1.207 +};
1.208 +
1.209 +void GCNotifier::sendNotificationInternal(TRAPS) {
1.210 + ResourceMark rm(THREAD);
1.211 + HandleMark hm(THREAD);
1.212 + GCNotificationRequest *request = getRequest();
1.213 + if (request != NULL) {
1.214 + NotificationMark nm(request);
1.215 + Handle objGcInfo = createGcInfo(request->gcManager, request->gcStatInfo, CHECK);
1.216 +
1.217 + Handle objName = java_lang_String::create_from_str(request->gcManager->name(), CHECK);
1.218 + Handle objAction = java_lang_String::create_from_str(request->gcAction, CHECK);
1.219 + Handle objCause = java_lang_String::create_from_str(request->gcCause, CHECK);
1.220 +
1.221 + Klass* k = Management::sun_management_GarbageCollectorImpl_klass(CHECK);
1.222 + instanceKlassHandle gc_mbean_klass(THREAD, k);
1.223 +
1.224 + instanceOop gc_mbean = request->gcManager->get_memory_manager_instance(THREAD);
1.225 + instanceHandle gc_mbean_h(THREAD, gc_mbean);
1.226 + if (!gc_mbean_h->is_a(k)) {
1.227 + THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1.228 + "This GCMemoryManager doesn't have a GarbageCollectorMXBean");
1.229 + }
1.230 +
1.231 + JavaValue result(T_VOID);
1.232 + JavaCallArguments args(gc_mbean_h);
1.233 + args.push_long(request->timestamp);
1.234 + args.push_oop(objName);
1.235 + args.push_oop(objAction);
1.236 + args.push_oop(objCause);
1.237 + args.push_oop(objGcInfo);
1.238 +
1.239 + JavaCalls::call_virtual(&result,
1.240 + gc_mbean_klass,
1.241 + vmSymbols::createGCNotification_name(),
1.242 + vmSymbols::createGCNotification_signature(),
1.243 + &args,
1.244 + CHECK);
1.245 + }
1.246 +}
1.247 +
