| /* |
| * Copyright (c) 2011, 2018, 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. |
| */ |
| |
| /* |
| * @test |
| * @bug 7036199 |
| * @summary Check that GarbageCollectionNotification contents are reasonable |
| * @author Frederic Parain |
| * @requires vm.opt.ExplicitGCInvokesConcurrent == null | vm.opt.ExplicitGCInvokesConcurrent == false |
| * @modules java.management/sun.management |
| * jdk.management |
| * @run main/othervm -Xms64m -Xmx64m GarbageCollectionNotificationContentTest |
| */ |
| |
| import java.util.*; |
| import java.lang.management.*; |
| import java.lang.reflect.*; |
| import javax.management.*; |
| import javax.management.openmbean.*; |
| import com.sun.management.GarbageCollectionNotificationInfo; |
| import com.sun.management.GcInfo; |
| import java.security.AccessController; |
| import java.security.PrivilegedAction; |
| import java.lang.reflect.Field; |
| |
| public class GarbageCollectionNotificationContentTest { |
| private static HashMap<String,GarbageCollectionNotificationInfo> listenerInvoked |
| = new HashMap<String,GarbageCollectionNotificationInfo>(); |
| static volatile long count = 0; |
| static volatile long number = 0; |
| static Object synchronizer = new Object(); |
| |
| static class GcListener implements NotificationListener { |
| public void handleNotification(Notification notif, Object handback) { |
| String type = notif.getType(); |
| if (type.equals(GarbageCollectionNotificationInfo.GARBAGE_COLLECTION_NOTIFICATION)) { |
| GarbageCollectionNotificationInfo gcNotif = |
| GarbageCollectionNotificationInfo.from((CompositeData) notif.getUserData()); |
| String source = ((ObjectName)notif.getSource()).getCanonicalName(); |
| synchronized(synchronizer) { |
| if(listenerInvoked.get(source) == null) { |
| listenerInvoked.put(((ObjectName)notif.getSource()).getCanonicalName(),gcNotif); |
| count++; |
| if(count >= number) { |
| synchronizer.notify(); |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| public static void main(String[] args) throws Exception { |
| MBeanServer mbs = ManagementFactory.getPlatformMBeanServer(); |
| final boolean isNotificationSupported = |
| sun.management.ManagementFactoryHelper.getVMManagement().isGcNotificationSupported(); |
| |
| if(!isNotificationSupported) { |
| System.out.println("GC Notification not supported by the JVM, test skipped"); |
| return; |
| } |
| final ObjectName gcMXBeanPattern = |
| new ObjectName("java.lang:type=GarbageCollector,*"); |
| Set<ObjectName> names = |
| mbs.queryNames(gcMXBeanPattern, null); |
| if (names.isEmpty()) |
| throw new Exception("Test incorrect: no GC MXBeans"); |
| number = names.size(); |
| for (ObjectName n : names) { |
| if(mbs.isInstanceOf(n,"javax.management.NotificationEmitter")) { |
| listenerInvoked.put(n.getCanonicalName(),null); |
| GcListener listener = new GcListener(); |
| mbs.addNotificationListener(n, listener, null, null); |
| } |
| } |
| // Invocation of System.gc() to trigger major GC |
| System.gc(); |
| // Allocation of many short living and small objects to trigger minor GC |
| Object data[] = new Object[32]; |
| for(int i = 0; i<10000000; i++) { |
| data[i%32] = new int[8]; |
| } |
| int wakeup = 0; |
| synchronized(synchronizer) { |
| while(count != number) { |
| synchronizer.wait(10000); |
| wakeup++; |
| if(wakeup > 10) |
| break; |
| } |
| } |
| for (GarbageCollectionNotificationInfo notif : listenerInvoked.values() ) { |
| checkGarbageCollectionNotificationInfoContent(notif); |
| } |
| System.out.println("Test passed"); |
| } |
| |
| private static void checkGarbageCollectionNotificationInfoContent(GarbageCollectionNotificationInfo notif) throws Exception { |
| System.out.println("GC notification for "+notif.getGcName()); |
| System.out.print("Action: "+notif.getGcAction()); |
| System.out.println(" Cause: "+notif.getGcCause()); |
| GcInfo info = notif.getGcInfo(); |
| System.out.print("GC Info #" + info.getId()); |
| System.out.print(" start:" + info.getStartTime()); |
| System.out.print(" end:" + info.getEndTime()); |
| System.out.println(" (" + info.getDuration() + "ms)"); |
| Map<String, MemoryUsage> usage = info.getMemoryUsageBeforeGc(); |
| |
| List<String> pnames = new ArrayList<String>(); |
| for (Map.Entry entry : usage.entrySet() ) { |
| String poolname = (String) entry.getKey(); |
| pnames.add(poolname); |
| MemoryUsage busage = (MemoryUsage) entry.getValue(); |
| MemoryUsage ausage = (MemoryUsage) info.getMemoryUsageAfterGc().get(poolname); |
| if (ausage == null) { |
| throw new RuntimeException("After Gc Memory does not exist" + |
| " for " + poolname); |
| } |
| System.out.println("Usage for pool " + poolname); |
| System.out.println(" Before GC: " + busage); |
| System.out.println(" After GC: " + ausage); |
| |
| checkMemoryUsage(poolname, busage, ausage); |
| } |
| |
| // check if memory usage for all memory pools are returned |
| List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans(); |
| for (MemoryPoolMXBean p : pools ) { |
| if (!pnames.contains(p.getName())) { |
| throw new RuntimeException("GcInfo does not contain " + |
| "memory usage for pool " + p.getName()); |
| } |
| } |
| } |
| |
| private static void checkMemoryUsage(String poolname, MemoryUsage busage, MemoryUsage ausage) throws Exception { |
| if (poolname.contains("Eden Space") && busage.getUsed() > 0) { |
| // Used size at Eden Space should be decreased or |
| if (busage.getUsed() <= ausage.getUsed()) { |
| throw new RuntimeException("Used size at Eden Space should be decreased."); |
| } |
| } |
| } |
| } |