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 }