1 /* 2 * Copyright (c) 2016, 2019, 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 24 package gc.metaspace; 25 import jdk.test.lib.process.ProcessTools; 26 import jdk.test.lib.process.OutputAnalyzer; 27 import jdk.test.lib.Asserts; 28 import sun.hotspot.WhiteBox; 29 30 /* @test TestMetaspaceCMSCancel 31 * @bug 8026752 32 * @summary Tests cancel of CMS concurrent cycle for Metaspace after a full GC 33 * @requires vm.gc.ConcMarkSweep & !vm.graal.enabled 34 * @library /test/lib 35 * @modules java.base/jdk.internal.misc 36 * @build sun.hotspot.WhiteBox 37 * @run driver ClassFileInstaller sun.hotspot.WhiteBox 38 * @run main/othervm gc.metaspace.TestMetaspaceCMSCancel 39 */ 40 41 42 public class TestMetaspaceCMSCancel { 43 44 public static void main(String[] args) throws Exception { 45 // Set a small MetaspaceSize so that a CMS concurrent collection will be 46 // scheduled. Set CMSWaitDuration to 5s so that the concurrent collection 47 // start may be delayed. It does not guarantee 5s before the start of the 48 // concurrent collection but does increase the probability that it will 49 // be started later. System.gc() is used to invoke a full collection. Set 50 // ExplicitGCInvokesConcurrent to off so it is a STW collection. 51 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-Xbootclasspath/a:.", 52 "-XX:+UnlockDiagnosticVMOptions", 53 "-XX:+WhiteBoxAPI", 54 "-XX:+UseConcMarkSweepGC", 55 "-XX:MetaspaceSize=2m", 56 "-XX:CMSWaitDuration=5000", 57 "-XX:-ExplicitGCInvokesConcurrent", 58 "-Xlog:gc*=debug", 59 MetaspaceGCTest.class.getName()); 60 61 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 62 output.shouldNotContain("Concurrent Reset"); 63 output.shouldHaveExitValue(0); 64 } 65 66 static class MetaspaceGCTest { 67 public static void main(String [] args) { 68 WhiteBox wb = WhiteBox.getWhiteBox(); 69 System.gc(); 70 Asserts.assertFalse(wb.metaspaceShouldConcurrentCollect()); 71 } 72 } 73 }