73 lines
2.8 KiB
Java
73 lines
2.8 KiB
Java
/*
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* Copyright (c) 2024, 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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/* @test
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* @summary Check that TAMSes are correctly updated for regions dropped from
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* the retained collection set candidates during a Concurrent Start pause.
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* @requires vm.gc.G1
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* @requires vm.flagless
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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 -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
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-XX:+WhiteBoxAPI -Xbootclasspath/a:. -Xmx32m -XX:G1NumCollectionsKeepPinned=1
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-XX:+VerifyBeforeGC -XX:+VerifyAfterGC -XX:G1MixedGCLiveThresholdPercent=100
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-XX:G1HeapWastePercent=0 -Xlog:gc,gc+ergo+cset=trace gc.g1.pinnedobjs.TestDroppedRetainedTAMS
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*/
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package gc.g1.pinnedobjs;
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import jdk.test.whitebox.WhiteBox;
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public class TestDroppedRetainedTAMS {
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private static final WhiteBox wb = WhiteBox.getWhiteBox();
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private static final char[] dummy = new char[100];
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public static void main(String[] args) {
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wb.fullGC(); // Move the target dummy object to old gen.
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wb.pinObject(dummy);
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// After this concurrent cycle the pinned region will be in the the (marking)
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// collection set candidates.
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wb.g1RunConcurrentGC();
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// Pass the Prepare mixed gc which will not do anything about the marking
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// candidates.
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wb.youngGC();
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// Mixed GC. Will complete. That pinned region is now retained. The mixed gcs
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// will end here.
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wb.youngGC();
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// The pinned region will be dropped from the retained candidates during the
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// Concurrent Start GC, leaving that region's TAMS broken.
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wb.g1RunConcurrentGC();
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// Verification will find a lot of broken objects.
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wb.youngGC();
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System.out.println(dummy);
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}
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}
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