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 & !vm.graal.enabled 28 * 29 * @run main/othervm/native -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx512m 30 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive 31 * -XX:+ShenandoahVerify -XX:+ShenandoahDegeneratedGC 32 * TestPinnedGarbage 33 * 34 * @run main/othervm/native -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx512m 35 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive 36 * -XX:+ShenandoahVerify -XX:-ShenandoahDegeneratedGC 37 * TestPinnedGarbage 38 */ 39 40 /* @test TestPinnedGarbage 41 * @summary Test that garbage in the pinned region does not crash VM 42 * @key gc 43 * @requires vm.gc.Shenandoah & !vm.graal.enabled 44 * 45 * @run main/othervm/native -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx512m 46 * -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive 47 * TestPinnedGarbage 48 * 49 * @run main/othervm/native -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx512m 50 * -XX:+UseShenandoahGC 51 * -XX:+ShenandoahVerify 52 * TestPinnedGarbage 53 */ 54 55 import java.util.Arrays; 56 import java.util.concurrent.*; 57 58 public class TestPinnedGarbage { 59 static { 60 System.loadLibrary("TestPinnedGarbage"); 61 } 62 63 private static final int NUM_RUNS = 1_000; 64 private static final int OBJS_COUNT = 1_000; 65 private static final int GARBAGE_COUNT = 1_000_000; 66 67 private static native void pin(int[] a); 68 private static native void unpin(int[] a); 69 70 public static void main(String[] args) { 71 for (int i = 0; i < NUM_RUNS; i++) { 72 test(); 73 } 74 } 75 76 private static void test() { 77 Object[] objs = new Object[OBJS_COUNT]; 78 for (int i = 0; i < OBJS_COUNT; i++) { 79 objs[i] = new MyClass(); 80 } 81 82 int[] cog = new int[10]; 83 int cogIdx = ThreadLocalRandom.current().nextInt(OBJS_COUNT); 84 objs[cogIdx] = cog; 85 pin(cog); 86 87 for (int i = 0; i < GARBAGE_COUNT; i++) { 88 int rIdx = ThreadLocalRandom.current().nextInt(OBJS_COUNT); 89 if (rIdx != cogIdx) { 90 objs[rIdx] = new MyClass(); 91 } 92 } 93 94 unpin(cog); 95 } 96 97 public static class MyClass { 98 public Object ref = new Object(); 99 } 100 101 }