/* * Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package gc.g1; import java.util.LinkedHashMap; /* @test * @bug 8313212 * @summary Finalizing objects may create new concurrent marking work during reference processing. * If the marking work overflows the global mark stack, we should resize the global mark stack * until MarkStackSizeMax if possible. * @requires vm.gc.G1 * @run main/othervm -XX:ActiveProcessorCount=2 -XX:MarkStackSize=1 -Xmx250m gc.g1.TestMarkStackOverflow */ public class TestMarkStackOverflow { public static void main(String[] args) throws Exception { for (int i = 0; i < 10; i++) { Finalizable holder1 = new Finalizable(); System.out.printf("Used mem %.2f MB\n", getUsedMem()); } } private static double getUsedMem() { return (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / (double) (1024 * 1024); } private static class Finalizable { public static final int NUM_OBJECTS = 200_000; private final LinkedHashMap list = new LinkedHashMap<>(); public Finalizable() { for (int i = 0; i < NUM_OBJECTS; i++) { Object entry = new Object(); list.put(entry, entry); } } @SuppressWarnings("removal") protected void finalize() { System.out.print(""); } } }