1 /* 2 * Copyright (c) 2016, Oracle and/or its affiliates. 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 import jdk.test.lib.process.ProcessTools; 24 import jdk.test.lib.process.OutputAnalyzer; 25 import jdk.test.lib.Asserts; 26 import sun.hotspot.WhiteBox; 27 28 /* @test TestMetaspaceCMSCancel 29 * @bug 8026752 30 * @summary Tests cancel of CMS concurrent cycle for Metaspace after a full GC 31 * @library /testlibrary /test/lib /test/lib/share/classes 32 * @modules java.base/jdk.internal.misc 33 * @build TestMetaspaceCMSCancel 34 * @run main ClassFileInstaller sun.hotspot.WhiteBox 35 * @run main/othervm TestMetaspaceCMSCancel 36 */ 37 38 39 public class TestMetaspaceCMSCancel { 40 41 public static void main(String[] args) throws Exception { 42 // Set a small MetaspaceSize so that a CMS concurrent collection will be 43 // scheduled. Set CMSWaitDuration to 5s so that the concurrent collection 44 // start may be delayed. It does not guarantee 5s before the start of the 45 // concurrent collection but does increase the probability that it will 46 // be started later. System.gc() is used to invoke a full collection. Set 47 // ExplicitGCInvokesConcurrent to off so it is a STW collection. 48 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-Xbootclasspath/a:.", 49 "-XX:+UnlockDiagnosticVMOptions", 50 "-XX:+WhiteBoxAPI", 51 "-XX:+UseConcMarkSweepGC", 52 "-XX:MetaspaceSize=2m", 53 "-XX:CMSWaitDuration=5000", 54 "-XX:-ExplicitGCInvokesConcurrent", 55 "-Xlog:gc*=debug", 56 MetaspaceGCTest.class.getName()); 57 58 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 59 output.shouldNotContain("Concurrent Reset"); 60 output.shouldHaveExitValue(0); 61 } 62 63 static class MetaspaceGCTest { 64 public static void main(String [] args) { 65 WhiteBox wb = WhiteBox.getWhiteBox(); 66 System.gc(); 67 Asserts.assertFalse(wb.metaspaceShouldConcurrentCollect()); 68 } 69 } 70 }