392 lines
11 KiB
Java
392 lines
11 KiB
Java
/*
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* Copyright (c) 2013, 2015, 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 TestLargePagesFlags
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* @summary Tests how large pages are choosen depending on the given large pages flag combinations.
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* @library /testlibrary
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* @modules java.base/jdk.internal.misc
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* java.management
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* @run main TestLargePagesFlags
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*/
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import jdk.test.lib.OutputAnalyzer;
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import jdk.test.lib.Platform;
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import jdk.test.lib.ProcessTools;
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import java.util.ArrayList;
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public class TestLargePagesFlags {
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public static void main(String [] args) throws Exception {
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if (!Platform.isLinux()) {
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System.out.println("Skipping. TestLargePagesFlags has only been implemented for Linux.");
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return;
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}
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testUseTransparentHugePages();
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testUseHugeTLBFS();
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testUseSHM();
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testCombinations();
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}
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public static void testUseTransparentHugePages() throws Exception {
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if (!canUse(UseTransparentHugePages(true))) {
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System.out.println("Skipping testUseTransparentHugePages");
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return;
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}
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// -XX:-UseLargePages overrides all other flags.
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new FlagTester()
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.use(UseLargePages(false),
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UseTransparentHugePages(true))
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.expect(
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UseLargePages(false),
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UseTransparentHugePages(false),
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UseHugeTLBFS(false),
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UseSHM(false));
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// Explicitly turn on UseTransparentHugePages.
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new FlagTester()
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.use(UseTransparentHugePages(true))
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.expect(
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UseLargePages(true),
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UseTransparentHugePages(true),
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UseHugeTLBFS(false),
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UseSHM(false));
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new FlagTester()
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.use(UseLargePages(true),
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UseTransparentHugePages(true))
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.expect(
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UseLargePages(true),
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UseTransparentHugePages(true),
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UseHugeTLBFS(false),
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UseSHM(false));
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// Setting a specific large pages flag will turn
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// off heuristics to choose large pages type.
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new FlagTester()
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.use(UseLargePages(true),
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UseTransparentHugePages(false))
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.expect(
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UseLargePages(false),
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UseTransparentHugePages(false),
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UseHugeTLBFS(false),
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UseSHM(false));
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// Don't turn on UseTransparentHugePages
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// unless the user explicitly asks for them.
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new FlagTester()
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.use(UseLargePages(true))
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.expect(
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UseTransparentHugePages(false));
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}
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public static void testUseHugeTLBFS() throws Exception {
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if (!canUse(UseHugeTLBFS(true))) {
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System.out.println("Skipping testUseHugeTLBFS");
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return;
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}
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// -XX:-UseLargePages overrides all other flags.
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new FlagTester()
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.use(UseLargePages(false),
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UseHugeTLBFS(true))
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.expect(
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UseLargePages(false),
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UseTransparentHugePages(false),
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UseHugeTLBFS(false),
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UseSHM(false));
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// Explicitly turn on UseHugeTLBFS.
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new FlagTester()
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.use(UseHugeTLBFS(true))
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.expect(
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UseLargePages(true),
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UseTransparentHugePages(false),
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UseHugeTLBFS(true),
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UseSHM(false));
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new FlagTester()
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.use(UseLargePages(true),
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UseHugeTLBFS(true))
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.expect(
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UseLargePages(true),
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UseTransparentHugePages(false),
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UseHugeTLBFS(true),
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UseSHM(false));
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// Setting a specific large pages flag will turn
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// off heuristics to choose large pages type.
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new FlagTester()
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.use(UseLargePages(true),
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UseHugeTLBFS(false))
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.expect(
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UseLargePages(false),
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UseTransparentHugePages(false),
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UseHugeTLBFS(false),
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UseSHM(false));
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// Using UseLargePages will default to UseHugeTLBFS large pages.
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new FlagTester()
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.use(UseLargePages(true))
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.expect(
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UseLargePages(true),
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UseTransparentHugePages(false),
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UseHugeTLBFS(true),
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UseSHM(false));
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}
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public static void testUseSHM() throws Exception {
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if (!canUse(UseSHM(true))) {
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System.out.println("Skipping testUseSHM");
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return;
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}
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// -XX:-UseLargePages overrides all other flags.
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new FlagTester()
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.use(UseLargePages(false),
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UseSHM(true))
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.expect(
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UseLargePages(false),
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UseTransparentHugePages(false),
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UseHugeTLBFS(false),
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UseSHM(false));
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// Explicitly turn on UseSHM.
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new FlagTester()
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.use(UseSHM(true))
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.expect(
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UseLargePages(true),
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UseTransparentHugePages(false),
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UseHugeTLBFS(false),
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UseSHM(true)) ;
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new FlagTester()
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.use(UseLargePages(true),
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UseSHM(true))
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.expect(
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UseLargePages(true),
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UseTransparentHugePages(false),
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UseHugeTLBFS(false),
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UseSHM(true)) ;
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// Setting a specific large pages flag will turn
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// off heuristics to choose large pages type.
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new FlagTester()
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.use(UseLargePages(true),
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UseSHM(false))
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.expect(
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UseLargePages(false),
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UseTransparentHugePages(false),
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UseHugeTLBFS(false),
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UseSHM(false));
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// Setting UseLargePages can allow the system to choose
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// UseHugeTLBFS instead of UseSHM, but never UseTransparentHugePages.
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new FlagTester()
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.use(UseLargePages(true))
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.expect(
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UseLargePages(true),
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UseTransparentHugePages(false));
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}
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public static void testCombinations() throws Exception {
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if (!canUse(UseSHM(true)) || !canUse(UseHugeTLBFS(true))) {
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System.out.println("Skipping testUseHugeTLBFSAndUseSHMCombination");
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return;
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}
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// UseHugeTLBFS takes precedence over SHM.
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new FlagTester()
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.use(UseLargePages(true),
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UseHugeTLBFS(true),
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UseSHM(true))
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.expect(
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UseLargePages(true),
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UseTransparentHugePages(false),
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UseHugeTLBFS(true),
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UseSHM(false));
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new FlagTester()
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.use(UseLargePages(true),
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UseHugeTLBFS(false),
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UseSHM(true))
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.expect(
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UseLargePages(true),
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UseTransparentHugePages(false),
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UseHugeTLBFS(false),
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UseSHM(true));
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new FlagTester()
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.use(UseLargePages(true),
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UseHugeTLBFS(true),
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UseSHM(false))
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.expect(
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UseLargePages(true),
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UseTransparentHugePages(false),
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UseHugeTLBFS(true),
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UseSHM(false));
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new FlagTester()
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.use(UseLargePages(true),
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UseHugeTLBFS(false),
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UseSHM(false))
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.expect(
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UseLargePages(false),
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UseTransparentHugePages(false),
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UseHugeTLBFS(false),
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UseSHM(false));
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if (!canUse(UseTransparentHugePages(true))) {
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return;
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}
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// UseTransparentHugePages takes precedence.
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new FlagTester()
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.use(UseLargePages(true),
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UseTransparentHugePages(true),
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UseHugeTLBFS(true),
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UseSHM(true))
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.expect(
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UseLargePages(true),
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UseTransparentHugePages(true),
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UseHugeTLBFS(false),
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UseSHM(false));
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new FlagTester()
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.use(UseTransparentHugePages(true),
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UseHugeTLBFS(true),
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UseSHM(true))
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.expect(
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UseLargePages(true),
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UseTransparentHugePages(true),
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UseHugeTLBFS(false),
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UseSHM(false));
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}
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private static class FlagTester {
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private Flag [] useFlags;
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public FlagTester use(Flag... useFlags) {
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this.useFlags = useFlags;
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return this;
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}
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public void expect(Flag... expectedFlags) throws Exception {
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if (useFlags == null) {
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throw new IllegalStateException("Must run use() before expect()");
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}
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OutputAnalyzer output = executeNewJVM(useFlags);
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for (Flag flag : expectedFlags) {
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System.out.println("Looking for: " + flag.flagString());
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String strValue = output.firstMatch(".* " + flag.name() + " .* :?= (\\S+).*", 1);
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if (strValue == null) {
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throw new RuntimeException("Flag " + flag.name() + " couldn't be found");
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}
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if (!flag.value().equals(strValue)) {
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throw new RuntimeException("Wrong value for: " + flag.name()
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+ " expected: " + flag.value()
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+ " got: " + strValue);
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}
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}
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output.shouldHaveExitValue(0);
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}
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}
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private static OutputAnalyzer executeNewJVM(Flag... flags) throws Exception {
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ArrayList<String> args = new ArrayList<>();
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for (Flag flag : flags) {
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args.add(flag.flagString());
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}
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args.add("-XX:+PrintFlagsFinal");
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args.add("-version");
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ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(args.toArray(new String[args.size()]));
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OutputAnalyzer output = new OutputAnalyzer(pb.start());
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return output;
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}
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private static boolean canUse(Flag flag) {
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try {
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new FlagTester().use(flag).expect(flag);
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} catch (Exception e) {
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return false;
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}
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return true;
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}
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private static Flag UseLargePages(boolean value) {
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return new BooleanFlag("UseLargePages", value);
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}
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private static Flag UseTransparentHugePages(boolean value) {
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return new BooleanFlag("UseTransparentHugePages", value);
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}
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private static Flag UseHugeTLBFS(boolean value) {
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return new BooleanFlag("UseHugeTLBFS", value);
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}
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private static Flag UseSHM(boolean value) {
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return new BooleanFlag("UseSHM", value);
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}
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private static class BooleanFlag implements Flag {
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private String name;
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private boolean value;
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BooleanFlag(String name, boolean value) {
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this.name = name;
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this.value = value;
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}
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public String flagString() {
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return "-XX:" + (value ? "+" : "-") + name;
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}
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public String name() {
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return name;
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}
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public String value() {
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return Boolean.toString(value);
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}
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}
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private static interface Flag {
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public String flagString();
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public String name();
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public String value();
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}
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}
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