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