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 }