jdk8-mips64-public/hotspot: test/gc/class_unloading/TestCMSClassUnloadingEnabledHWM.java@6cbff0651f1a

     1 /*

     2  * Copyright (c) 2014, 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  */

    24 /*

    25  * @test

    26  * @key gc

    27  * @bug 8049831

    28  * @library /testlibrary /testlibrary/whitebox

    29  * @build TestCMSClassUnloadingEnabledHWM

    30  * @run main ClassFileInstaller sun.hotspot.WhiteBox

    31  * @run driver TestCMSClassUnloadingEnabledHWM

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

    33  */

    35 import com.oracle.java.testlibrary.OutputAnalyzer;

    36 import com.oracle.java.testlibrary.ProcessTools;

    37 import java.lang.management.GarbageCollectorMXBean;

    38 import java.lang.management.ManagementFactory;

    39 import java.util.ArrayList;

    40 import java.util.Arrays;

    41 import sun.hotspot.WhiteBox;

    43 public class TestCMSClassUnloadingEnabledHWM {

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

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

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

    48     ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(

    49       "-Xbootclasspath/a:.",

    50       "-XX:+UnlockDiagnosticVMOptions",

    51       "-XX:+WhiteBoxAPI",

    52       "-Xmx128m",

    53       "-XX:CMSMaxAbortablePrecleanTime=1",

    54       "-XX:CMSWaitDuration=50",

    55       "-XX:MetaspaceSize=" + MetaspaceSize,

    56       "-Xmn" + YoungGenSize,

    57       "-XX:+UseConcMarkSweepGC",

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

    59       "-XX:+PrintHeapAtGC",

    60       "-XX:+PrintGCDetails",

    61       "-XX:+PrintGCTimeStamps",

    62       TestCMSClassUnloadingEnabledHWM.AllocateBeyondMetaspaceSize.class.getName(),

    63       "" + MetaspaceSize);

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

    65   }

    67   public static OutputAnalyzer runWithCMSClassUnloading() throws Exception {

    68     return run(true);

    69   }

    71   public static OutputAnalyzer runWithoutCMSClassUnloading() throws Exception {

    72     return run(false);

    73   }

    75   public static void testWithoutCMSClassUnloading() throws Exception {

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

    77     OutputAnalyzer out = runWithoutCMSClassUnloading();

    79     out.shouldMatch(".*Full GC.*");

    80     out.shouldNotMatch(".*CMS Initial Mark.*");

    81   }

    83   public static void testWithCMSClassUnloading() throws Exception {

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

    85     OutputAnalyzer out = runWithCMSClassUnloading();

    87     out.shouldMatch(".*CMS Initial Mark.*");

    88     out.shouldNotMatch(".*Full GC.*");

    89   }

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

    92     testWithCMSClassUnloading();

    93     testWithoutCMSClassUnloading();

    94   }

    96   public static class AllocateBeyondMetaspaceSize {

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

    98       if (args.length != 1) {

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

   100       }

   102       WhiteBox wb = WhiteBox.getWhiteBox();

   104       // Allocate past the MetaspaceSize limit.

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

   106       long allocationBeyondMetaspaceSize  = metaspaceSize * 2;

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

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

   110       GarbageCollectorMXBean cmsGCBean = getCMSGCBean();

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

   112         Thread.sleep(100);

   113       }

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

   116     }

   118     private static GarbageCollectorMXBean getCMSGCBean() {

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

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

   121           return gcBean;

   122         }

   123       }

   124       return null;

   125     }

   126   }

   127 }

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