1 /*
  2  * Copyright (c) 2018, Red Hat, Inc. 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 /*
 26  * @test id=passive
 27  * @summary Check that MX notifications are reported for all cycles
 28  * @library /test/lib /
 29  * @requires vm.gc.Shenandoah
 30  *
 31  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
 32  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
 33  *      -XX:+ShenandoahDegeneratedGC -Dprecise=true
 34  *      TestChurnNotifications
 35  *
 36  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
 37  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
 38  *      -XX:-ShenandoahDegeneratedGC -Dprecise=true
 39  *      TestChurnNotifications
 40  */
 41 
 42 /*
 43  * @test id=aggressive
 44  * @summary Check that MX notifications are reported for all cycles
 45  * @library /test/lib /
 46  * @requires vm.gc.Shenandoah
 47  *
 48  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
 49  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive
 50  *      -Dprecise=false
 51  *      TestChurnNotifications
 52  */
 53 
 54 /*
 55  * @test id=adaptive
 56  * @summary Check that MX notifications are reported for all cycles
 57  * @library /test/lib /
 58  * @requires vm.gc.Shenandoah
 59  *
 60  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
 61  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive
 62  *      -Dprecise=false
 63  *      TestChurnNotifications
 64  */
 65 
 66 /*
 67  * @test id=static
 68  * @summary Check that MX notifications are reported for all cycles
 69  * @library /test/lib /
 70  * @requires vm.gc.Shenandoah
 71  *
 72  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
 73  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=static
 74  *      -Dprecise=false
 75  *      TestChurnNotifications
 76  */
 77 
 78 /*
 79  * @test id=compact
 80  * @summary Check that MX notifications are reported for all cycles
 81  * @library /test/lib /
 82  * @requires vm.gc.Shenandoah
 83  *
 84  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
 85  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=compact
 86  *      -Dprecise=false
 87  *      TestChurnNotifications
 88  */
 89 
 90 /*
 91  * @test id=iu
 92  * @summary Check that MX notifications are reported for all cycles
 93  * @library /test/lib /
 94  * @requires vm.gc.Shenandoah
 95  *
 96  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
 97  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu -XX:ShenandoahGCHeuristics=aggressive
 98  *      -Dprecise=false
 99  *      TestChurnNotifications
100  *
101  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
102  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu
103  *      -Dprecise=false
104  *      TestChurnNotifications
105  */
106 
107 import java.util.*;
108 import java.util.concurrent.atomic.*;
109 import javax.management.*;
110 import java.lang.management.*;
111 import javax.management.openmbean.*;
112 
113 import jdk.test.lib.Utils;
114 
115 import com.sun.management.GarbageCollectionNotificationInfo;
116 
117 public class TestChurnNotifications {
118 
119     static final long HEAP_MB = 128;                           // adjust for test configuration above
120     static final long TARGET_MB = Long.getLong("target", 2_000); // 2 Gb allocation
121 
122     // Should we track the churn precisely?
123     // Precise tracking is only reliable when GC is fully stop-the-world. Otherwise,
124     // we cannot tell, looking at heap used before/after, what was the GC churn.
125     static final boolean PRECISE = Boolean.getBoolean("precise");
126 
127     static final long M = 1024 * 1024;
128 
129     static volatile Object sink;
130 
131     public static void main(String[] args) throws Exception {
132         final long startTime = System.currentTimeMillis();
133 
134         final AtomicLong churnBytes = new AtomicLong();
135 
136         NotificationListener listener = new NotificationListener() {
137             @Override
138             public void handleNotification(Notification n, Object o) {
139                 if (n.getType().equals(GarbageCollectionNotificationInfo.GARBAGE_COLLECTION_NOTIFICATION)) {
140                     GarbageCollectionNotificationInfo info = GarbageCollectionNotificationInfo.from((CompositeData) n.getUserData());
141                     Map<String, MemoryUsage> mapBefore = info.getGcInfo().getMemoryUsageBeforeGc();
142                     Map<String, MemoryUsage> mapAfter = info.getGcInfo().getMemoryUsageAfterGc();
143 
144                     MemoryUsage before = mapBefore.get("Shenandoah");
145                     MemoryUsage after = mapAfter.get("Shenandoah");
146 
147                     if ((before != null) && (after != null)) {
148                         long diff = before.getUsed() - after.getUsed();
149                         if (diff > 0) {
150                             churnBytes.addAndGet(diff);
151                         }
152                     }
153                 }
154             }
155         };
156 
157         for (GarbageCollectorMXBean bean : ManagementFactory.getGarbageCollectorMXBeans()) {
158             ((NotificationEmitter) bean).addNotificationListener(listener, null, null);
159         }
160 
161         final int size = 100_000;
162         long count = TARGET_MB * 1024 * 1024 / (16 + 4 * size);
163 
164         long mem = count * (16 + 4 * size);
165 
166         for (int c = 0; c < count; c++) {
167             sink = new int[size];
168         }
169 
170         System.gc();
171 
172         long minExpected = PRECISE ? (mem - HEAP_MB * 1024 * 1024) : 1;
173         long maxExpected = mem + HEAP_MB * 1024 * 1024;
174         long actual = 0;
175 
176         // Look at test timeout to figure out how long we can wait without breaking into timeout.
177         // Default to 1/4 of the remaining time in 1s steps.
178         final long STEP_MS = 1000;
179         long spentTime = System.currentTimeMillis() - startTime;
180         long maxTries = (Utils.adjustTimeout(Utils.DEFAULT_TEST_TIMEOUT) - spentTime) / STEP_MS / 4;
181 
182         // Wait until enough notifications are accrued to match minimum boundary.
183         long tries = 0;
184         while (tries++ < maxTries) {
185             actual = churnBytes.get();
186             if (minExpected <= actual) {
187                 // Wait some more to test if we are breaking the maximum boundary.
188                 Thread.sleep(5000);
189                 actual = churnBytes.get();
190                 break;
191             }
192             Thread.sleep(STEP_MS);
193         }
194 
195         String msg = "Expected = [" + minExpected / M + "; " + maxExpected / M + "] (" + mem / M + "), actual = " + actual / M;
196         if (minExpected <= actual && actual <= maxExpected) {
197             System.out.println(msg);
198         } else {
199             throw new IllegalStateException(msg);
200         }
201     }
202 }