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