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 package gc.epsilon;
25 
26 /**
27  * @test TestAlwaysPretouch
28  * @requires vm.gc.Epsilon
29  * @summary Basic sanity test for Epsilon
30  * @library /test/lib
31  * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC gc.epsilon.TestEpsilonEnabled
32  */
33 
34 import java.lang.management.GarbageCollectorMXBean;
35 import java.lang.management.ManagementFactory;
36 
37 public class TestEpsilonEnabled {
main(String[] args)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 
isEpsilonEnabled()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 }
53