106 lines
4.7 KiB
Java
106 lines
4.7 KiB
Java
/*
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* Copyright (c) Ampere Computing 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 TestTransparentHugePageUsage
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* @bug 8315923
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* @library /test/lib
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* @requires vm.gc.Serial & os.family == "linux" & os.maxMemory > 2G
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* @summary Check that a pretouched java heap appears to use THPs by checking
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* AnonHugePages in smaps
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* @comment Use SerialGC to increase the time window for pretouching
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* @run driver runtime.os.TestTransparentHugePageUsage
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*/
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package runtime.os;
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import java.io.BufferedReader;
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import java.io.FileReader;
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import java.io.InputStreamReader;
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import java.util.AbstractMap.SimpleEntry;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Optional;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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import jdk.test.lib.process.ProcessTools;
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public class TestTransparentHugePageUsage {
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private static final String[] fixedCmdLine = {
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"-XX:+UseTransparentHugePages", "-XX:+AlwaysPreTouch",
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"-Xlog:startuptime,pagesize,gc+heap=debug",
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"-XX:+UseSerialGC", "-Xms1G", "-Xmx1G",
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};
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public static void main(String[] args) throws Exception {
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ArrayList<String> cmdLine = new ArrayList<>(Arrays.asList(fixedCmdLine));
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cmdLine.add("runtime.os.TestTransparentHugePageUsage$CatSmaps");
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ProcessBuilder builder = ProcessTools.createTestJavaProcessBuilder(cmdLine);
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checkUsage(new BufferedReader(new InputStreamReader(builder.start().getInputStream())));
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}
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private static void checkUsage(BufferedReader reader) throws Exception {
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final Pattern useThp = Pattern.compile(".*\\[info\\]\\[pagesize\\].+UseTransparentHugePages=1.*");
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// Ensure THP is not disabled by OS.
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if (reader.lines().filter(line -> useThp.matcher(line).matches()).findFirst().isPresent()) {
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final Pattern heapAddr = Pattern.compile(".*\\sHeap:\\s.+base=0x0*(\\p{XDigit}+).*");
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final Optional<Long> addr = reader.lines()
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.map(line -> new SimpleEntry<String, Matcher>(line, heapAddr.matcher(line)))
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.filter(e -> e.getValue().matches())
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.findFirst()
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.map(e -> Long.valueOf(e.getKey().substring(e.getValue().start(1), e.getValue().end(1)), 16));
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if (!addr.isPresent()) throw new RuntimeException("Heap base was not found in smaps.");
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// Match the start of a mapping, for example:
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// 200000000-800000000 rw-p 00000000 00:00 0
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final Pattern mapping = Pattern.compile("^(\\p{XDigit}+)-\\p{XDigit}+.*");
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reader.lines()
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.filter(line -> {
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Matcher matcher = mapping.matcher(line);
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if (matcher.matches()) {
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Long mappingAddr = Long.valueOf(line.substring(matcher.start(1), matcher.end(1)), 16);
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if (mappingAddr.equals(addr.get())) return true;
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}
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return false;
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})
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.findFirst();
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final Pattern thpUsage = Pattern.compile("^AnonHugePages:\\s+(\\d+)\\skB");
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final Optional<Long> usage = reader.lines()
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.map(line -> new SimpleEntry<String, Matcher>(line, thpUsage.matcher(line)))
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.filter(e -> e.getValue().matches())
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.findFirst()
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.map(e -> Long.valueOf(e.getKey().substring(e.getValue().start(1), e.getValue().end(1))));
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if (!usage.isPresent()) throw new RuntimeException("The usage of THP was not found.");
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// Even with MADV_POPULATE_WRITE, the usage of THP is still one page less than the whole heap.
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if (usage.get() < 524288) throw new RuntimeException("The usage of THP is not enough.");
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}
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}
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public static class CatSmaps {
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public static void main(String[] args) throws Exception {
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new BufferedReader(new FileReader("/proc/self/smaps"))
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.lines()
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.forEach(line -> System.out.println(line));
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}
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}
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}
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