1 /*
   2  * Copyright (c) 2018, Red Hat, Inc. All rights reserved.
   3  *
   4  * This code is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This code is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  11  * version 2 for more details (a copy is included in the LICENSE file that
  12  * accompanied this code).
  13  *
  14  * You should have received a copy of the GNU General Public License version
  15  * 2 along with this work; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  19  * or visit www.oracle.com if you need additional information or have any
  20  * questions.
  21  *
  22  */
  23 
  24 /*
  25  * @test TestChurnNotifications
  26  * @summary Check that MX notifications are reported for all cycles
  27  * @key gc
  28  *
  29  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive            -XX:+ShenandoahDegeneratedGC -Dprecise=true  TestChurnNotifications
  30  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive            -XX:-ShenandoahDegeneratedGC -Dprecise=true  TestChurnNotifications
  31  *
  32  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive     -Dprecise=false TestChurnNotifications
  33  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=static       -Dprecise=false TestChurnNotifications
  34  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=compact      -Dprecise=false TestChurnNotifications
  35  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive   -Dprecise=false TestChurnNotifications
  36  *
  37  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCMode=traversal -XX:ShenandoahGCHeuristics=aggressive   -Dprecise=false TestChurnNotifications
  38  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCMode=traversal -Dprecise=false TestChurnNotifications
  39  */
  40 
  41 import java.util.*;
  42 import java.util.concurrent.atomic.*;
  43 import javax.management.*;
  44 import java.lang.management.*;
  45 import javax.management.openmbean.*;
  46 
  47 import com.sun.management.GarbageCollectionNotificationInfo;
  48 
  49 public class TestChurnNotifications {
  50 
  51     static final long HEAP_MB = 128;                           // adjust for test configuration above
  52     static final long TARGET_MB = Long.getLong("target", 8_000); // 8 Gb allocation
  53 
  54     // Should we track the churn precisely?
  55     // Precise tracking is only reliable when GC is fully stop-the-world. Otherwise,
  56     // we cannot tell, looking at heap used before/after, what was the GC churn.
  57     static final boolean PRECISE = Boolean.getBoolean("precise");
  58 
  59     static final long M = 1024 * 1024;
  60 
  61     static volatile Object sink;
  62 
  63     public static void main(String[] args) throws Exception {
  64         final AtomicLong churnBytes = new AtomicLong();
  65 
  66         NotificationListener listener = new NotificationListener() {
  67             @Override
  68             public void handleNotification(Notification n, Object o) {
  69                 if (n.getType().equals(GarbageCollectionNotificationInfo.GARBAGE_COLLECTION_NOTIFICATION)) {
  70                     GarbageCollectionNotificationInfo info = GarbageCollectionNotificationInfo.from((CompositeData) n.getUserData());
  71                     Map<String, MemoryUsage> mapBefore = info.getGcInfo().getMemoryUsageBeforeGc();
  72                     Map<String, MemoryUsage> mapAfter = info.getGcInfo().getMemoryUsageAfterGc();
  73 
  74                     MemoryUsage before = mapBefore.get("Shenandoah");
  75                     MemoryUsage after = mapAfter.get("Shenandoah");
  76 
  77                     if ((before != null) && (after != null)) {
  78                         long diff = before.getUsed() - after.getUsed();
  79                         if (diff > 0) {
  80                             churnBytes.addAndGet(diff);
  81                         }
  82                     }
  83                 }
  84             }
  85         };
  86 
  87         for (GarbageCollectorMXBean bean : ManagementFactory.getGarbageCollectorMXBeans()) {
  88             ((NotificationEmitter) bean).addNotificationListener(listener, null, null);
  89         }
  90 
  91         final int size = 100_000;
  92         long count = TARGET_MB * 1024 * 1024 / (16 + 4 * size);
  93 
  94         long mem = count * (16 + 4 * size);
  95 
  96         for (int c = 0; c < count; c++) {
  97             sink = new int[size];
  98         }
  99 
 100         System.gc();
 101 
 102         Thread.sleep(1000);
 103 
 104         long actual = churnBytes.get();
 105 
 106         long minExpected = PRECISE ? (mem - HEAP_MB * 1024 * 1024) : 1;
 107         long maxExpected = mem + HEAP_MB * 1024 * 1024;
 108 
 109         String msg = "Expected = [" + minExpected / M + "; " + maxExpected / M + "] (" + mem / M + "), actual = " + actual / M;
 110         if (minExpected < actual && actual < maxExpected) {
 111             System.out.println(msg);
 112         } else {
 113             throw new IllegalStateException(msg);
 114         }
 115     }
 116 }