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 }