98 lines
3.5 KiB
Java
98 lines
3.5 KiB
Java
/*
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* Copyright (c) 2015, 2023, 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 TestPLABSizeBounds
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* @bug 8134857
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* @summary Regression test to ensure that G1 supports PLAB sizes of half a region size.
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* @requires vm.gc.G1
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* @library /test/lib
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* @modules java.base/jdk.internal.misc
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* java.management
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* @run driver gc.g1.TestPLABSizeBounds
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*/
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import java.util.ArrayList;
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import jdk.test.lib.Platform;
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import jdk.test.lib.process.OutputAnalyzer;
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import jdk.test.lib.process.ProcessTools;
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public class TestPLABSizeBounds {
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public static final int M = 1024 * 1024;
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/**
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* Starts the VM with the given region size and the given PLAB size arguments. The VM start should
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* succeed if shouldSucceed is true, otherwise it should fail.
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*
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* @param regionSize The region size the VM should be started with in bytes.
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* @param plabSize The young and old gen PLAB sizes the VM should be started with in machine words.
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* @param shouldSucceed The expected result of the VM invocation.
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*/
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public static void runTest(int regionSize, int plabSize, boolean shouldSucceed) throws Exception {
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ArrayList<String> testArguments = new ArrayList<String>();
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testArguments.add("-XX:+UseG1GC");
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testArguments.add("-Xmx256M");
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testArguments.add("-XX:G1HeapRegionSize=" + regionSize);
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testArguments.add("-XX:YoungPLABSize=" + plabSize);
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testArguments.add("-XX:OldPLABSize=" + plabSize);
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testArguments.add(GCTest.class.getName());
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OutputAnalyzer output = ProcessTools.executeLimitedTestJava(testArguments);
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if (shouldSucceed) {
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output.shouldHaveExitValue(0);
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} else {
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output.shouldHaveExitValue(1);
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}
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}
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public static void runRegionTest(int regionSize) throws Exception {
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final int regionSizeInBytes = regionSize * M;
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final int wordSize = Platform.is32bit() ? 4 : 8;
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runTest(regionSizeInBytes, (regionSizeInBytes / wordSize) / 2 - 1, true);
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runTest(regionSizeInBytes, (regionSizeInBytes / wordSize) / 2, true);
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runTest(regionSizeInBytes, (regionSizeInBytes / wordSize) / 2 + 1, false);
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}
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public static void main(String[] args) throws Exception {
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runRegionTest(1);
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runRegionTest(2);
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runRegionTest(4);
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runRegionTest(8);
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runRegionTest(16);
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runRegionTest(32);
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}
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static class GCTest {
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public static void main(String [] args) {
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System.out.println("Test completed.");
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}
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}
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}
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