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comparison src/share/vm/services/gcNotifier.cpp @ 3356:78542e2b5e35

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7036199: Adding a notification to the implementation of GarbageCollectorMXBeans Summary: Add a notification to the GarbageCollectorMXBeans Reviewed-by: acorn, mchung
author fparain
date Thu, 12 May 2011 10:30:11 -0700
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children 87e40b34bc2b
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3355:f1cbbee6713b 3356:78542e2b5e35
1 /*
2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/systemDictionary.hpp"
27 #include "classfile/vmSymbols.hpp"
28 #include "oops/oop.inline.hpp"
29 #include "runtime/interfaceSupport.hpp"
30 #include "runtime/java.hpp"
31 #include "runtime/javaCalls.hpp"
32 #include "runtime/mutex.hpp"
33 #include "runtime/mutexLocker.hpp"
34 #include "services/gcNotifier.hpp"
35 #include "services/management.hpp"
36 #include "services/memoryService.hpp"
37 #include "memoryManager.hpp"
38 #include "memory/oopFactory.hpp"
39
40 GCNotificationRequest *GCNotifier::first_request = NULL;
41 GCNotificationRequest *GCNotifier::last_request = NULL;
42
43 void GCNotifier::pushNotification(GCMemoryManager *mgr, const char *action, const char *cause) {
44 // Make a copy of the last GC statistics
45 // GC may occur between now and the creation of the notification
46 int num_pools = MemoryService::num_memory_pools();
47 GCStatInfo* stat = new GCStatInfo(num_pools);
48 mgr->get_last_gc_stat(stat);
49 GCNotificationRequest *request = new GCNotificationRequest(os::javaTimeMillis(),mgr,action,cause,stat);
50 addRequest(request);
51 }
52
53 void GCNotifier::addRequest(GCNotificationRequest *request) {
54 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
55 if(first_request == NULL) {
56 first_request = request;
57 } else {
58 last_request->next = request;
59 }
60 last_request = request;
61 Service_lock->notify_all();
62 }
63
64 GCNotificationRequest *GCNotifier::getRequest() {
65 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
66 GCNotificationRequest *request = first_request;
67 if(first_request != NULL) {
68 first_request = first_request->next;
69 }
70 return request;
71 }
72
73 bool GCNotifier::has_event() {
74 return first_request != NULL;
75 }
76
77 static Handle getGcInfoBuilder(GCMemoryManager *gcManager,TRAPS) {
78
79 klassOop k = Management::sun_management_GarbageCollectorImpl_klass(CHECK_NH);
80 instanceKlassHandle gcMBeanKlass (THREAD, k);
81
82 instanceOop i = gcManager->get_memory_manager_instance(THREAD);
83 instanceHandle ih(THREAD, i);
84
85 JavaValue result(T_OBJECT);
86 JavaCallArguments args(ih);
87
88 JavaCalls::call_virtual(&result,
89 gcMBeanKlass,
90 vmSymbols::getGcInfoBuilder_name(),
91 vmSymbols::getGcInfoBuilder_signature(),
92 &args,
93 CHECK_NH);
94 return Handle(THREAD,(oop)result.get_jobject());
95
96 }
97
98 static Handle createGcInfo(GCMemoryManager *gcManager, GCStatInfo *gcStatInfo,TRAPS) {
99
100 // Fill the arrays of MemoryUsage objects with before and after GC
101 // per pool memory usage
102
103 klassOop muKlass = Management::java_lang_management_MemoryUsage_klass(CHECK_NH); objArrayOop bu = oopFactory::new_objArray( muKlass,MemoryService::num_memory_pools(), CHECK_NH);
104 objArrayHandle usage_before_gc_ah(THREAD, bu);
105 objArrayOop au = oopFactory::new_objArray(muKlass,MemoryService::num_memory_pools(), CHECK_NH);
106 objArrayHandle usage_after_gc_ah(THREAD, au);
107
108 for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
109 Handle before_usage = MemoryService::create_MemoryUsage_obj(gcStatInfo->before_gc_usage_for_pool(i), CHECK_NH);
110 Handle after_usage;
111
112 MemoryUsage u = gcStatInfo->after_gc_usage_for_pool(i);
113 if (u.max_size() == 0 && u.used() > 0) {
114 // If max size == 0, this pool is a survivor space.
115 // Set max size = -1 since the pools will be swapped after GC.
116 MemoryUsage usage(u.init_size(), u.used(), u.committed(), (size_t)-1);
117 after_usage = MemoryService::create_MemoryUsage_obj(usage, CHECK_NH);
118 } else {
119 after_usage = MemoryService::create_MemoryUsage_obj(u, CHECK_NH);
120 }
121 usage_before_gc_ah->obj_at_put(i, before_usage());
122 usage_after_gc_ah->obj_at_put(i, after_usage());
123 }
124
125 // Current implementation only has 1 attribute (number of GC threads)
126 // The type is 'I'
127 objArrayOop extra_args_array = oopFactory::new_objArray(SystemDictionary::Integer_klass(), 1, CHECK_NH);
128 objArrayHandle extra_array (THREAD, extra_args_array);
129 klassOop itKlass= SystemDictionary::Integer_klass();
130 instanceKlassHandle intK(THREAD, itKlass);
131
132 instanceHandle extra_arg_val = intK->allocate_instance_handle(CHECK_NH);
133
134 {
135 JavaValue res(T_VOID);
136 JavaCallArguments argsInt;
137 argsInt.push_oop(extra_arg_val);
138 argsInt.push_int(gcManager->num_gc_threads());
139
140 JavaCalls::call_special(&res,
141 intK,
142 vmSymbols::object_initializer_name(),
143 vmSymbols::int_void_signature(),
144 &argsInt,
145 CHECK_NH);
146 }
147 extra_array->obj_at_put(0,extra_arg_val());
148
149 klassOop gcInfoklass = Management::com_sun_management_GcInfo_klass(CHECK_NH);
150 instanceKlassHandle ik (THREAD,gcInfoklass);
151
152 Handle gcInfo_instance = ik->allocate_instance_handle(CHECK_NH);
153
154 JavaValue constructor_result(T_VOID);
155 JavaCallArguments constructor_args(16);
156 constructor_args.push_oop(gcInfo_instance);
157 constructor_args.push_oop(getGcInfoBuilder(gcManager,THREAD));
158 constructor_args.push_long(gcStatInfo->gc_index());
159 constructor_args.push_long(gcStatInfo->start_time());
160 constructor_args.push_long(gcStatInfo->end_time());
161 constructor_args.push_oop(usage_before_gc_ah);
162 constructor_args.push_oop(usage_after_gc_ah);
163 constructor_args.push_oop(extra_array);
164
165 JavaCalls::call_special(&constructor_result,
166 ik,
167 vmSymbols::object_initializer_name(),
168 vmSymbols::com_sun_management_GcInfo_constructor_signature(),
169 &constructor_args,
170 CHECK_NH);
171
172 return Handle(gcInfo_instance());
173 }
174
175 void GCNotifier::sendNotification(TRAPS) {
176 ResourceMark rm(THREAD);
177 GCNotificationRequest *request = getRequest();
178 if(request != NULL) {
179 Handle objGcInfo = createGcInfo(request->gcManager,request->gcStatInfo,THREAD);
180
181 Handle objName = java_lang_String::create_from_platform_dependent_str(request->gcManager->name(), CHECK);
182 Handle objAction = java_lang_String::create_from_platform_dependent_str(request->gcAction, CHECK);
183 Handle objCause = java_lang_String::create_from_platform_dependent_str(request->gcCause, CHECK);
184
185 klassOop k = Management::sun_management_GarbageCollectorImpl_klass(CHECK);
186 instanceKlassHandle gc_mbean_klass (THREAD, k);
187
188 instanceOop gc_mbean = request->gcManager->get_memory_manager_instance(THREAD);
189 instanceHandle gc_mbean_h(THREAD, gc_mbean);
190 if (!gc_mbean_h->is_a(k)) {
191 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
192 "This GCMemoryManager doesn't have a GarbageCollectorMXBean");
193 }
194
195 JavaValue result(T_VOID);
196 JavaCallArguments args(gc_mbean_h);
197 args.push_long(request->timestamp);
198 args.push_oop(objName);
199 args.push_oop(objAction);
200 args.push_oop(objCause);
201 args.push_oop(objGcInfo);
202
203 JavaCalls::call_virtual(&result,
204 gc_mbean_klass,
205 vmSymbols::createGCNotification_name(),
206 vmSymbols::createGCNotification_signature(),
207 &args,
208 CHECK);
209 if (HAS_PENDING_EXCEPTION) {
210 CLEAR_PENDING_EXCEPTION;
211 }
212
213 delete request;
214 }
215 }
216