1 /*

     2  * Copyright (c) 2014, 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.class_unloading;

    25 

    26 /*

    27  * @test

    28  * @key gc

    29  * @bug 8049831

    30  * @requires vm.gc.ConcMarkSweep & !vm.graal.enabled

    31  * @library /test/lib

    32  * @modules java.base/jdk.internal.misc

    33  *          java.management

    34  * @build sun.hotspot.WhiteBox

    35  * @run driver ClassFileInstaller sun.hotspot.WhiteBox

    36  *                              sun.hotspot.WhiteBox$WhiteBoxPermission

    37  * @run driver gc.class_unloading.TestCMSClassUnloadingEnabledHWM

    38  * @summary Test that -XX:-CMSClassUnloadingEnabled will trigger a Full GC when more than MetaspaceSize metadata is allocated.

    39  */

    40 

    41 import jdk.test.lib.process.OutputAnalyzer;

    42 import jdk.test.lib.process.ProcessTools;

    43 import java.lang.management.GarbageCollectorMXBean;

    44 import java.lang.management.ManagementFactory;

    45 import sun.hotspot.WhiteBox;

    46 

    47 public class TestCMSClassUnloadingEnabledHWM {

    48   private static long MetaspaceSize = 32 * 1024 * 1024;

    49   private static long YoungGenSize  = 32 * 1024 * 1024;

    50 

    51   private static OutputAnalyzer run(boolean enableUnloading) throws Exception {

    52     ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(

    53       "-Xbootclasspath/a:.",

    54       "-XX:+UnlockDiagnosticVMOptions",

    55       "-XX:+WhiteBoxAPI",

    56       "-Xmx128m",

    57       "-XX:CMSMaxAbortablePrecleanTime=1",

    58       "-XX:CMSWaitDuration=50",

    59       "-XX:MetaspaceSize=" + MetaspaceSize,

    60       "-Xmn" + YoungGenSize,

    61       "-XX:+UseConcMarkSweepGC",

    62       "-XX:" + (enableUnloading ? "+" : "-") + "CMSClassUnloadingEnabled",

    63       "-Xlog:gc",

    64       TestCMSClassUnloadingEnabledHWM.AllocateBeyondMetaspaceSize.class.getName(),

    65       "" + MetaspaceSize);

    66     return new OutputAnalyzer(pb.start());

    67   }

    68 

    69   public static OutputAnalyzer runWithCMSClassUnloading() throws Exception {

    70     return run(true);

    71   }

    72 

    73   public static OutputAnalyzer runWithoutCMSClassUnloading() throws Exception {

    74     return run(false);

    75   }

    76 

    77   public static void testWithoutCMSClassUnloading() throws Exception {

    78     // -XX:-CMSClassUnloadingEnabled is used, so we expect a full GC instead of a concurrent cycle.

    79     OutputAnalyzer out = runWithoutCMSClassUnloading();

    80 

    81     out.shouldMatch(".*Pause Full.*");

    82     out.shouldNotMatch(".*Pause Initial Mark.*");

    83   }

    84 

    85   public static void testWithCMSClassUnloading() throws Exception {

    86     // -XX:+CMSClassUnloadingEnabled is used, so we expect a concurrent cycle instead of a full GC.

    87     OutputAnalyzer out = runWithCMSClassUnloading();

    88 

    89     out.shouldMatch(".*Pause Initial Mark.*");

    90     out.shouldNotMatch(".*Pause Full.*");

    91   }

    92 

    93   public static void main(String args[]) throws Exception {

    94     testWithCMSClassUnloading();

    95     testWithoutCMSClassUnloading();

    96   }

    97 

    98   public static class AllocateBeyondMetaspaceSize {

    99     public static void main(String [] args) throws Exception {

   100       if (args.length != 1) {

   101         throw new IllegalArgumentException("Usage: <MetaspaceSize>");

   102       }

   103 

   104       WhiteBox wb = WhiteBox.getWhiteBox();

   105 

   106       // Allocate past the MetaspaceSize limit.

   107       long metaspaceSize = Long.parseLong(args[0]);

   108       long allocationBeyondMetaspaceSize  = metaspaceSize * 2;

   109       long metaspace = wb.allocateMetaspace(null, allocationBeyondMetaspaceSize);

   110 

   111       // Wait for at least one GC to occur. The caller will parse the log files produced.

   112       GarbageCollectorMXBean cmsGCBean = getCMSGCBean();

   113       while (cmsGCBean.getCollectionCount() == 0) {

   114         Thread.sleep(100);

   115       }

   116 

   117       wb.freeMetaspace(null, metaspace, metaspace);

   118     }

   119 

   120     private static GarbageCollectorMXBean getCMSGCBean() {

   121       for (GarbageCollectorMXBean gcBean : ManagementFactory.getGarbageCollectorMXBeans()) {

   122         if (gcBean.getObjectName().toString().equals("java.lang:type=GarbageCollector,name=ConcurrentMarkSweep")) {

   123           return gcBean;

   124         }

   125       }

   126       return null;

   127     }

   128   }

   129 }

   130