99 lines
4.5 KiB
Java
99 lines
4.5 KiB
Java
/*
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* Copyright (c) 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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/*
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* @test
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* @bug 8304954
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* @summary Code cache reservation should gracefully downgrade to using smaller pages if the code cache size is too small to host the requested page size.
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* @requires os.family == "linux"
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* @requires vm.gc != "Z"
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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 -XX:+WhiteBoxAPI -XX:+UseLargePages -XX:LargePageSizeInBytes=1g compiler.codecache.CheckLargePages
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*/
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package compiler.codecache;
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import jdk.test.lib.Asserts;
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import jdk.test.lib.process.OutputAnalyzer;
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import jdk.test.lib.process.ProcessTools;
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import jdk.test.whitebox.WhiteBox;
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import java.util.Arrays;
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import java.util.List;
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public class CheckLargePages {
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private final static WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
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public static void main(String[] args) throws Exception {
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final boolean largePages = WHITE_BOX.getBooleanVMFlag("UseLargePages");
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final long largePageSize = WHITE_BOX.getVMLargePageSize();
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if (largePages && (largePageSize == 1024 * 1024 * 1024)) {
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ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
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"-XX:+UseLargePages",
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"-XX:+SegmentedCodeCache",
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"-XX:InitialCodeCacheSize=2g",
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"-XX:ReservedCodeCacheSize=2g",
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"-XX:LargePageSizeInBytes=1g",
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"-Xlog:pagesize=info",
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"-version");
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OutputAnalyzer out = new OutputAnalyzer(pb.start());
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out.shouldMatch("Code cache size too small for \\S* pages\\. Reverting to smaller page size \\((\\S*)\\)\\.");
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out.shouldHaveExitValue(0);
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// Parse page sizes to find next biggest page
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String sizes = out.firstMatch("Usable page sizes:(.*)", 1);
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List<Long> sizeList = Arrays.stream(sizes.trim().split("\\s*,\\s*")).map(CheckLargePages::parseMemoryString).sorted().toList();
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final int smallerPageSizeIndex = sizeList.indexOf(largePageSize) - 1;
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Asserts.assertGreaterThanOrEqual(smallerPageSizeIndex, 0);
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final long smallerPageSize = sizeList.get(smallerPageSizeIndex);
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// Retrieve reverted page size from code cache warning
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String revertedSizeString = out.firstMatch("Code cache size too small for (\\S*) pages. Reverting to smaller page size \\((\\S*)\\)\\.", 2);
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Asserts.assertEquals(parseMemoryString(revertedSizeString), smallerPageSize);
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} else {
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System.out.println("1GB large pages not supported: UseLargePages=" + largePages +
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(largePages ? ", largePageSize=" + largePageSize : "") + ". Skipping");
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}
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}
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public static long parseMemoryString(String value) {
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value = value.toUpperCase();
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long multiplier = 1;
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if (value.endsWith("B")) {
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multiplier = 1;
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} else if (value.endsWith("K")) {
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multiplier = 1024;
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} else if (value.endsWith("M")) {
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multiplier = 1024 * 1024;
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} else if (value.endsWith("G")) {
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multiplier = 1024 * 1024 * 1024;
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} else {
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throw new IllegalArgumentException("Expected memory string '" + value + "'to end with either of: B, K, M, G");
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}
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long longValue = Long.parseUnsignedLong(value.substring(0, value.length() - 1));
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return longValue * multiplier;
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}
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}
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