jdk8-mips64-public/hotspot: test/gc/class_unloading/TestG1ClassUnloadingHWM.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 TestG1ClassUnloadingHWM

    30  * @run main ClassFileInstaller sun.hotspot.WhiteBox

    31  * @run driver TestG1ClassUnloadingHWM

    32  * @summary Test that -XX:-ClassUnloadingWithConcurrentMark 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.util.ArrayList;

    38 import java.util.Arrays;

    39 import sun.hotspot.WhiteBox;

    41 public class TestG1ClassUnloadingHWM {

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

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

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

    46     ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(

    47       "-Xbootclasspath/a:.",

    48       "-XX:+UnlockDiagnosticVMOptions",

    49       "-XX:+WhiteBoxAPI",

    50       "-XX:MetaspaceSize=" + MetaspaceSize,

    51       "-Xmn" + YoungGenSize,

    52       "-XX:+UseG1GC",

    53       "-XX:" + (enableUnloading ? "+" : "-") + "ClassUnloadingWithConcurrentMark",

    54       "-XX:+PrintHeapAtGC",

    55       "-XX:+PrintGCDetails",

    56       TestG1ClassUnloadingHWM.AllocateBeyondMetaspaceSize.class.getName(),

    57       "" + MetaspaceSize,

    58       "" + YoungGenSize);

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

    60   }

    62   public static OutputAnalyzer runWithG1ClassUnloading() throws Exception {

    63     return run(true);

    64   }

    66   public static OutputAnalyzer runWithoutG1ClassUnloading() throws Exception {

    67     return run(false);

    68   }

    70   public static void testWithoutG1ClassUnloading() throws Exception {

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

    72     OutputAnalyzer out = runWithoutG1ClassUnloading();

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

    75     out.shouldNotMatch(".*initial-mark.*");

    76   }

    78   public static void testWithG1ClassUnloading() throws Exception {

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

    80     OutputAnalyzer out = runWithG1ClassUnloading();

    82     out.shouldMatch(".*initial-mark.*");

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

    84   }

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

    87     testWithG1ClassUnloading();

    88     testWithoutG1ClassUnloading();

    89   }

    91   public static class AllocateBeyondMetaspaceSize {

    92     public static Object dummy;

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

    95       if (args.length != 2) {

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

    97       }

    99       WhiteBox wb = WhiteBox.getWhiteBox();

   101       // Allocate past the MetaspaceSize limit

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

   103       long allocationBeyondMetaspaceSize  = metaspaceSize * 2;

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

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

   107       triggerYoungGCs(youngGenSize);

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

   110     }

   112     public static void triggerYoungGCs(long youngGenSize) {

   113       long approxAllocSize = 32 * 1024;

   114       long numAllocations  = 2 * youngGenSize / approxAllocSize;

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

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

   118       }

   119     }

   120   }

   121 }

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