--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/gc/shenandoah/mxbeans/TestPauseNotifications.java	Mon Dec 10 15:47:44 2018 +0100
@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 2018, Red Hat, Inc. All rights reserved.
+ *
+ * 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 TestPauseNotifications
+ * @summary Check that MX notifications are reported for all cycles
+ * @key gc
+ * @requires vm.gc.Shenandoah
+ *
+ * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=passive       -XX:+ShenandoahDegeneratedGC TestPauseNotifications
+ * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=passive       -XX:-ShenandoahDegeneratedGC TestPauseNotifications
+ *
+ * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive    TestPauseNotifications
+ *
+ * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive      TestPauseNotifications
+ * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=static        TestPauseNotifications
+ * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=compact       TestPauseNotifications
+ * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=traversal     TestPauseNotifications
+ */
+
+import java.util.*;
+import java.util.concurrent.atomic.*;
+import javax.management.*;
+import java.lang.management.*;
+import javax.management.openmbean.*;
+
+import com.sun.management.GarbageCollectionNotificationInfo;
+
+public class TestPauseNotifications {
+
+    static final long HEAP_MB = 128;                           // adjust for test configuration above
+    static final long TARGET_MB = Long.getLong("target", 8_000); // 8 Gb allocation
+
+    static volatile Object sink;
+
+    public static void main(String[] args) throws Exception {
+        final AtomicLong pausesDuration = new AtomicLong();
+        final AtomicLong cyclesDuration = new AtomicLong();
+
+        NotificationListener listener = new NotificationListener() {
+            @Override
+            public void handleNotification(Notification n, Object o) {
+                if (n.getType().equals(GarbageCollectionNotificationInfo.GARBAGE_COLLECTION_NOTIFICATION)) {
+                    GarbageCollectionNotificationInfo info = GarbageCollectionNotificationInfo.from((CompositeData) n.getUserData());
+
+                    System.out.println(info.getGcInfo().toString());
+                    System.out.println(info.getGcName());
+                    System.out.println();
+
+                    long d = info.getGcInfo().getDuration();
+
+                    String name = info.getGcName();
+                    if (name.contains("Shenandoah")) {
+                        if (name.equals("Shenandoah Pauses")) {
+                            pausesDuration.addAndGet(d);
+                        } else if (name.equals("Shenandoah Cycles")) {
+                            cyclesDuration.addAndGet(d);
+                        } else {
+                            throw new IllegalStateException("Unknown name: " + name);
+                        }
+                    }
+                }
+            }
+        };
+
+        for (GarbageCollectorMXBean bean : ManagementFactory.getGarbageCollectorMXBeans()) {
+            ((NotificationEmitter) bean).addNotificationListener(listener, null, null);
+        }
+
+        final int size = 100_000;
+        long count = TARGET_MB * 1024 * 1024 / (16 + 4 * size);
+
+        for (int c = 0; c < count; c++) {
+            sink = new int[size];
+        }
+
+        Thread.sleep(1000);
+
+        long pausesActual = pausesDuration.get();
+        long cyclesActual = cyclesDuration.get();
+
+        long minExpected = 1;
+        long maxExpected = Long.MAX_VALUE;
+
+        {
+            String msg = "Pauses expected = [" + minExpected + "; " + maxExpected + "], actual = " + pausesActual;
+            if (minExpected < pausesActual && pausesActual < maxExpected) {
+                System.out.println(msg);
+            } else {
+                throw new IllegalStateException(msg);
+            }
+        }
+
+        {
+            String msg = "Cycles expected = [" + minExpected + "; " + maxExpected + "], actual = " + cyclesActual;
+            if (minExpected < cyclesActual && cyclesActual < maxExpected) {
+                System.out.println(msg);
+            } else {
+                throw new IllegalStateException(msg);
+            }
+        }
+
+        {
+            String msg = "Cycle duration (" + cyclesActual + "), pause duration (" + pausesActual + ")";
+            if (pausesActual < cyclesActual) {
+                System.out.println(msg);
+            } else {
+                throw new IllegalStateException(msg);
+            }
+        }
+    }
+}