75 lines
3.3 KiB
Java
75 lines
3.3 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 TestHumongousRemSetsMatch
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* @bug 8205426
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* @summary Test to make sure that humongous object remset states are in sync
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* @requires vm.gc.G1 & os.maxMemory >= 2G
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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:. -XX:+UnlockDiagnosticVMOptions -Xmx512M -Xms512M -Xmn10M -XX:ParallelGCThreads=2 -XX:-UseDynamicNumberOfGCThreads -XX:+UseG1GC -XX:+WhiteBoxAPI -XX:G1HeapRegionSize=1M -XX:+VerifyAfterGC -Xlog:gc,gc+remset+tracking=trace gc.g1.TestHumongousRemsetsMatch
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*/
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import jdk.test.whitebox.WhiteBox;
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public class TestHumongousRemsetsMatch {
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// G1 at the moment uses one thread every this amount of regions.
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private static final int WorkerThreadBoundary = 384;
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private static final int ObjSizeInRegions = 17;
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private static final int M = 1024 * 1024;
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private static final int TypeArrayObjSize = ObjSizeInRegions * M / 4 /* sizeof(int) */ - 1024 /* > header size */;
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public static void main(String[] args) throws Exception {
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WhiteBox wb = WhiteBox.getWhiteBox();
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for (int j = 0; j < 3; j++) {
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wb.fullGC(); // Start with a clean slate
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// It may happen that our 7-region sized humongous objects may just be "misaligned"
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// so that they do not cross the region 384 boundary. Try to counter this by offsetting
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// the humongous objects just a little.
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Object alignmentFudge = new int[(j + 1) * M / 4 /* sizeof(int) */ - 1024];
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// Fill the heap so that more than WorkerThreadBoundary regions are occupied with humongous objects
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// and hopefully one of these objects crosses the region WorkerThreadBoundary boundary.
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Object[] lotsOfHumongousObjects = new Object[(WorkerThreadBoundary / ObjSizeInRegions) + 3];
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for (int i = 0; i < lotsOfHumongousObjects.length; i++) {
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lotsOfHumongousObjects[i] = new int[TypeArrayObjSize];
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}
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wb.fullGC();
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wb.g1RunConcurrentGC();
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wb.youngGC(); // Trigger verification error.
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System.out.println(lotsOfHumongousObjects + " " + alignmentFudge);
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}
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}
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}
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