62 lines
2.3 KiB
Java
62 lines
2.3 KiB
Java
/*
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* Copyright (c) 2018, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package gc.g1;
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/*
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* @test TestEdenSurvivorLessThanMax
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* @bug 8152724
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* @summary Check that G1 eden plus survivor max capacity after GC does not exceed maximum number of regions.
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* @requires vm.gc.G1
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* @library /test/lib
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* @build jdk.test.whitebox.WhiteBox
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* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
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* @run main/othervm -Xbootclasspath/a:. -Xlog:gc+heap=debug -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UseG1GC -Xmx64M -Xms64M -Xmn50M -XX:SurvivorRatio=1 gc.g1.TestEdenSurvivorLessThanMax
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*/
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import jdk.test.whitebox.WhiteBox;
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// The test fills the heap in a way that previous to 8152724 the maximum number of survivor regions
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// for that young gc was higher than there was free space left which is impossible.
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public class TestEdenSurvivorLessThanMax {
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private static final long BYTES_TO_FILL = 50 * 1024 * 1024;
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private static final WhiteBox WB = WhiteBox.getWhiteBox();
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public static void main(String[] args) throws Exception {
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Object o = new int[100];
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long objSize = WB.getObjectSize(o);
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// Fill eden to approximately ~90%.
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int numObjs = (int)((BYTES_TO_FILL / objSize) * 9 / 10);
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for (int i = 0; i < numObjs; i++) {
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o = new int[100];
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}
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WB.youngGC();
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System.out.println(o.toString());
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}
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}
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