--- /dev/null 2018-06-10 19:57:01.244702788 +0200 +++ new/test/hotspot/jtreg/gc/epsilon/TestEpsilonEnabled.java 2018-06-12 10:45:54.494968683 +0200 @@ -0,0 +1,52 @@ +/* + * Copyright (c) 2017, 2018, Red Hat, Inc. 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. + * + * 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 TestAlwaysPretouch + * @key gc + * @requires vm.gc.Epsilon + * @summary Basic sanity test for Epsilon + * @library /test/lib + * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestEpsilonEnabled + */ + +import jdk.test.lib.Platform; +import java.lang.management.GarbageCollectorMXBean; +import java.lang.management.ManagementFactory; + +public class TestEpsilonEnabled { + public static void main(String[] args) throws Exception { + if (!isEpsilonEnabled()) { + throw new IllegalStateException("Debug builds should have Epsilon enabled"); + } + } + + public static boolean isEpsilonEnabled() { + for (GarbageCollectorMXBean bean : ManagementFactory.getGarbageCollectorMXBeans()) { + if (bean.getName().contains("Epsilon")) { + return true; + } + } + return false; + } +}