1 /*
   2  * Copyright (c) 2017, 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  * @test TestAlwaysPretouch
  26  * @key gc
  27  * @requires vm.gc.Epsilon
  28  * @summary Basic sanity test for Epsilon
  29  * @library /test/lib
  30  * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestEpsilonEnabled
  31  */
  32 
  33 import jdk.test.lib.Platform;
  34 import java.lang.management.GarbageCollectorMXBean;
  35 import java.lang.management.ManagementFactory;
  36 
  37 public class TestEpsilonEnabled {
  38   public static void main(String[] args) throws Exception {
  39     if (!isEpsilonEnabled()) {
  40       throw new IllegalStateException("Debug builds should have Epsilon enabled");
  41     }
  42   }
  43 
  44   public static boolean isEpsilonEnabled() {
  45     for (GarbageCollectorMXBean bean : ManagementFactory.getGarbageCollectorMXBeans()) {
  46       if (bean.getName().contains("Epsilon")) {
  47         return true;
  48       }
  49     }
  50     return false;
  51   }
  52 }