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8324776: runtime/os/TestTransparentHugePageUsage.java fails with The usage of THP is not enough

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Reviewed-by: stuefe
This commit is contained in:
Liming Liu 2024-04-29 15:14:37 +00:00 committed by Thomas Stuefe
parent 151ef5d4d2
commit 8b8fb6427e
2 changed files with 0 additions and 106 deletions
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1
test/hotspot/jtreg/ProblemList.txt
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@ -111,7 +111,6 @@ runtime/StackGuardPages/TestStackGuardPagesNative.java 8303612 linux-all
runtime/ErrorHandling/TestDwarf.java#checkDecoder 8305489 linux-all
runtime/ErrorHandling/MachCodeFramesInErrorFile.java 8313315 linux-ppc64le
runtime/cds/appcds/customLoader/HelloCustom_JFR.java 8241075 linux-all,windows-x64
runtime/os/TestTransparentHugePageUsage.java 8324776 linux-all
runtime/Thread/TestAlwaysPreTouchStacks.java 8324781 linux-all
applications/jcstress/accessAtomic.java 8325984 generic-all

105
test/hotspot/jtreg/runtime/os/TestTransparentHugePageUsage.java
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@ -1,105 +0,0 @@
/*
* Copyright (c) Ampere Computing 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 TestTransparentHugePageUsage
* @bug 8315923
* @library /test/lib
* @requires vm.gc.Serial & os.family == "linux" & os.maxMemory > 2G
* @summary Check that a pretouched java heap appears to use THPs by checking
* AnonHugePages in smaps
* @comment Use SerialGC to increase the time window for pretouching
* @run driver runtime.os.TestTransparentHugePageUsage
*/
package runtime.os;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.InputStreamReader;
import java.util.AbstractMap.SimpleEntry;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Optional;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import jdk.test.lib.process.ProcessTools;
public class TestTransparentHugePageUsage {
private static final String[] fixedCmdLine = {
"-XX:+UseTransparentHugePages", "-XX:+AlwaysPreTouch",
"-Xlog:startuptime,pagesize,gc+heap=debug",
"-XX:+UseSerialGC", "-Xms1G", "-Xmx1G",
};
public static void main(String[] args) throws Exception {
ArrayList<String> cmdLine = new ArrayList<>(Arrays.asList(fixedCmdLine));
cmdLine.add("runtime.os.TestTransparentHugePageUsage$CatSmaps");
ProcessBuilder builder = ProcessTools.createTestJavaProcessBuilder(cmdLine);
checkUsage(new BufferedReader(new InputStreamReader(builder.start().getInputStream())));
}
private static void checkUsage(BufferedReader reader) throws Exception {
final Pattern useThp = Pattern.compile(".*\\[info\\]\\[pagesize\\].+UseTransparentHugePages=1.*");
// Ensure THP is not disabled by OS.
if (reader.lines().filter(line -> useThp.matcher(line).matches()).findFirst().isPresent()) {
final Pattern heapAddr = Pattern.compile(".*\\sHeap:\\s.+base=0x0*(\\p{XDigit}+).*");
final Optional<Long> addr = reader.lines()
.map(line -> new SimpleEntry<String, Matcher>(line, heapAddr.matcher(line)))
.filter(e -> e.getValue().matches())
.findFirst()
.map(e -> Long.valueOf(e.getKey().substring(e.getValue().start(1), e.getValue().end(1)), 16));
if (!addr.isPresent()) throw new RuntimeException("Heap base was not found in smaps.");
// Match the start of a mapping, for example:
// 200000000-800000000 rw-p 00000000 00:00 0
final Pattern mapping = Pattern.compile("^(\\p{XDigit}+)-\\p{XDigit}+.*");
reader.lines()
.filter(line -> {
Matcher matcher = mapping.matcher(line);
if (matcher.matches()) {
Long mappingAddr = Long.valueOf(line.substring(matcher.start(1), matcher.end(1)), 16);
if (mappingAddr.equals(addr.get())) return true;
}
return false;
})
.findFirst();
final Pattern thpUsage = Pattern.compile("^AnonHugePages:\\s+(\\d+)\\skB");
final Optional<Long> usage = reader.lines()
.map(line -> new SimpleEntry<String, Matcher>(line, thpUsage.matcher(line)))
.filter(e -> e.getValue().matches())
.findFirst()
.map(e -> Long.valueOf(e.getKey().substring(e.getValue().start(1), e.getValue().end(1))));
if (!usage.isPresent()) throw new RuntimeException("The usage of THP was not found.");
// Even with MADV_POPULATE_WRITE, the usage of THP is still one page less than the whole heap.
if (usage.get() < 524288) throw new RuntimeException("The usage of THP is not enough.");
}
}
public static class CatSmaps {
public static void main(String[] args) throws Exception {
new BufferedReader(new FileReader("/proc/self/smaps"))
.lines()
.forEach(line -> System.out.println(line));
}
}
}