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  */

    23 

    24 /*

    25  * @test

    26  * @key gc

    27  * @bug 8049831

    28  * @library /testlibrary /testlibrary/whitebox

    29  * @build TestCMSClassUnloadingDisabledHWM

    30  * @run main ClassFileInstaller sun.hotspot.WhiteBox

    31  * @run driver TestCMSClassUnloadingDisabledHWM

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

    33  */

    34 

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

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

    37 import sun.hotspot.WhiteBox;

    38 

    39 import java.util.ArrayList;

    40 import java.util.Arrays;

    41 

    42 public class TestCMSClassUnloadingDisabledHWM {

    43 

    44   private static OutputAnalyzer run(long metaspaceSize, long youngGenSize) throws Exception {

    45       ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(

    46         "-Xbootclasspath/a:.",

    47         "-XX:+WhiteBoxAPI",

    48         "-XX:MetaspaceSize=" + metaspaceSize,

    49         "-Xmn" + youngGenSize,

    50         "-XX:+UseConcMarkSweepGC",

    51         "-XX:-CMSClassUnloadingEnabled",

    52         "-XX:+PrintHeapAtGC",

    53         "-XX:+PrintGCDetails",

    54         "AllocateBeyondMetaspaceSize",

    55         "" + metaspaceSize,

    56         "" + youngGenSize);

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

    58   }

    59 

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

    61     long metaspaceSize = 32 * 1024 * 1024;

    62     long youngGenSize = 32 * 1024 * 1024;

    63 

    64     OutputAnalyzer out = run(metaspaceSize, youngGenSize);

    65 

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

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

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

    69   }

    70 }

    71 

    72 class AllocateBeyondMetaspaceSize {

    73   public static Object dummy;

    74 

    75   public static void main(String [] args) {

    76     if (args.length != 2) {

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

    78     }

    79 

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

    81     long youngGenSize = Long.parseLong(args[1]);

    82 

    83     run(metaspaceSize, youngGenSize);

    84   }

    85 

    86   private static void run(long metaspaceSize, long youngGenSize) {

    87     WhiteBox wb = WhiteBox.getWhiteBox();

    88 

    89     long allocationBeyondMetaspaceSize  = metaspaceSize * 2;

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

    91 

    92     triggerYoungGC(youngGenSize);

    93 

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

    95   }

    96 

    97   private static void triggerYoungGC(long youngGenSize) {

    98     long approxAllocSize = 32 * 1024;

    99     long numAllocations  = 2 * youngGenSize / approxAllocSize;

   100 

   101     for (long i = 0; i < numAllocations; i++) {

   102       dummy = new byte[(int)approxAllocSize];

   103     }

   104   }

   105 }