test/hotspot/jtreg/gc/shenandoah/mxbeans/TestPauseNotifications.java

@@ -1,7 +1,8 @@
  /*
   * Copyright (c) 2018, Red Hat, Inc. All rights reserved.
+  * Copyright Amazon.com Inc. 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.

@@ -96,10 +97,21 @@
   * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
   *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu
   *      TestPauseNotifications
   */
  
+ /*
+  * @test id=generational
+  * @summary Check that MX notifications are reported for all cycles
+  * @library /test/lib /
+  * @requires vm.gc.Shenandoah
+  *
+  * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
+  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=generational
+  *      TestPauseNotifications
+  */
+ 
  import java.util.*;
  import java.util.concurrent.atomic.*;
  import javax.management.*;
  import java.lang.management.*;
  import javax.management.openmbean.*;

@@ -120,11 +132,11 @@
              || "Degenerated GC".equals(action) || "Init Update Refs".equals(action)
              || "Final Update Refs".equals(action) || "Final Roots".equals(action);
      }
  
      public static void main(String[] args) throws Exception {
-         final long startTime = System.currentTimeMillis();
+         final long startTimeNanos = System.nanoTime();
  
          final AtomicLong pausesDuration = new AtomicLong();
          final AtomicLong cyclesDuration = new AtomicLong();
          final AtomicLong pausesCount = new AtomicLong();
          final AtomicLong cyclesCount = new AtomicLong();

@@ -171,12 +183,12 @@
          }
  
          // Look at test timeout to figure out how long we can wait without breaking into timeout.
          // Default to 1/4 of the remaining time in 1s steps.
          final long STEP_MS = 1000;
-         long spentTime = System.currentTimeMillis() - startTime;
-         long maxTries = (Utils.adjustTimeout(Utils.DEFAULT_TEST_TIMEOUT) - spentTime) / STEP_MS / 4;
+         long spentTimeNanos = System.nanoTime() - startTimeNanos;
+         long maxTries = (Utils.adjustTimeout(Utils.DEFAULT_TEST_TIMEOUT) - (spentTimeNanos / 1_000_000L)) / STEP_MS / 4;
  
          long actualPauses = 0;
          long actualCycles = 0;
  
          // Wait until enough notifications are accrued to match minimum boundary.