1 /*

     2  * Copyright (c) 2018, Red Hat, Inc. All rights reserved.

     3  *

     4  * This code is free software; you can redistribute it and/or modify it

     5  * under the terms of the GNU General Public License version 2 only, as

     6  * published by the Free Software Foundation.

     7  *

     8  * This code is distributed in the hope that it will be useful, but WITHOUT

     9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    11  * version 2 for more details (a copy is included in the LICENSE file that

    12  * accompanied this code).

    13  *

    14  * You should have received a copy of the GNU General Public License version

    15  * 2 along with this work; if not, write to the Free Software Foundation,

    16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    17  *

    18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    19  * or visit www.oracle.com if you need additional information or have any

    20  * questions.

    21  *

    22  */

    23 

    24 /* @test TestPinnedGarbage

    25  * @summary Test that garbage in the pinned region does not crash VM

    26  * @key gc

    27  * @requires vm.gc.Shenandoah

    28  *

    29  * @run main/othervm/native -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx512m -XX:+ShenandoahVerify -XX:ShenandoahGCHeuristics=passive    -XX:+ShenandoahDegeneratedGC TestPinnedGarbage

    30  * @run main/othervm/native -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx512m -XX:+ShenandoahVerify -XX:ShenandoahGCHeuristics=passive    -XX:-ShenandoahDegeneratedGC TestPinnedGarbage

    31  *

    32  * @run main/othervm/native -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx512m                       -XX:ShenandoahGCHeuristics=aggressive TestPinnedGarbage

    33  *

    34  * @run main/othervm/native -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx512m -XX:+ShenandoahVerify                                       TestPinnedGarbage

    35  */

    36 

    37 import java.util.Arrays;

    38 import java.util.concurrent.*;

    39 

    40 public class TestPinnedGarbage {

    41     static {

    42         System.loadLibrary("TestPinnedGarbage");

    43     }

    44 

    45     private static final int NUM_RUNS      = 1_000;

    46     private static final int OBJS_COUNT    = 1_000;

    47     private static final int GARBAGE_COUNT = 1_000_000;

    48 

    49     private static native void pin(int[] a);

    50     private static native void unpin(int[] a);

    51 

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

    53         for (int i = 0; i < NUM_RUNS; i++) {

    54             test();

    55         }

    56     }

    57 

    58     private static void test() {

    59         Object[] objs = new Object[OBJS_COUNT];

    60         for (int i = 0; i < OBJS_COUNT; i++) {

    61             objs[i] = new MyClass();

    62         }

    63 

    64         int[] cog = new int[10];

    65         int cogIdx = ThreadLocalRandom.current().nextInt(OBJS_COUNT);

    66         objs[cogIdx] = cog;

    67         pin(cog);

    68 

    69         for (int i = 0; i < GARBAGE_COUNT; i++) {

    70             int rIdx = ThreadLocalRandom.current().nextInt(OBJS_COUNT);

    71             if (rIdx != cogIdx) {

    72                 objs[rIdx] = new MyClass();

    73             }

    74         }

    75 

    76         unpin(cog);

    77     }

    78 

    79     public static class MyClass {

    80         public Object ref = new Object();

    81     }

    82 

    83 }