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/*
* Copyright (c) 2023, 2024, 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
* @bug 8304954
* @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.
* @requires os.family == "linux"
* @requires vm.gc != "Z"
* @library /test/lib
* @build jdk.test.whitebox.WhiteBox
* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UseLargePages -XX:LargePageSizeInBytes=1g compiler.codecache.CheckLargePages
*/
package compiler.codecache;
import jdk.test.lib.Asserts;
import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.process.ProcessTools;
import jdk.test.whitebox.WhiteBox;
import java.util.Scanner;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Arrays;
import java.util.List;
public class CheckLargePages {
private final static long LP_1G = 1024 * 1024 * 1024;
private final static boolean LARGE_PAGES_ENABLED;
private final static long LARGE_PAGE_SIZE;
private final static String LARGE_PAGE_NUMBER_FILE_BASE = "/sys/kernel/mm/hugepages/hugepages-%skB/nr_hugepages";
static {
WhiteBox whiteBox = WhiteBox.getWhiteBox();
LARGE_PAGES_ENABLED = whiteBox.getBooleanVMFlag("UseLargePages");
LARGE_PAGE_SIZE = (whiteBox.getBooleanVMFlag("UseLargePages")) ? whiteBox.getVMLargePageSize() : 0;
}
private static boolean isLargePageSizeEqual(long size) {
return LARGE_PAGE_SIZE == size;
}
private static int numberOfLargePages(long size) {
String largePageNumberFile = String.format(LARGE_PAGE_NUMBER_FILE_BASE, size / 1024);
try (Scanner scanner = new Scanner(new File(largePageNumberFile))) {
if (scanner.hasNextInt()) {
return scanner.nextInt();
}
} catch (FileNotFoundException e) { };
return 0;
}
private static void testSegmented2GbCodeCacheWith1GbPage() throws Exception {
ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder(
"-XX:+UseLargePages",
"-XX:+SegmentedCodeCache",
"-XX:InitialCodeCacheSize=2g",
"-XX:ReservedCodeCacheSize=2g",
"-XX:LargePageSizeInBytes=1g",
"-Xlog:pagesize=info",
"-version");
OutputAnalyzer out = new OutputAnalyzer(pb.start());
out.shouldMatch("Code cache size too small for \\S* pages\\. Reverting to smaller page size \\((\\S*)\\)\\.");
out.shouldHaveExitValue(0);
// Parse page sizes to find next biggest page
String sizes = out.firstMatch("Usable page sizes:([^.]+)", 1);
List<Long> sizeList = Arrays.stream(sizes.trim().split("\\s*,\\s*")).map(CheckLargePages::parseMemoryString)
.sorted().toList();
final int smallerPageSizeIndex = sizeList.indexOf(LARGE_PAGE_SIZE) - 1;
Asserts.assertGreaterThanOrEqual(smallerPageSizeIndex, 0);
final long smallerPageSize = sizeList.get(smallerPageSizeIndex);
// Retrieve reverted page size from code cache warning
String revertedSizeString = out.firstMatch(
"Code cache size too small for (\\S*) pages. Reverting to smaller page size \\((\\S*)\\)\\.", 2);
Asserts.assertEquals(parseMemoryString(revertedSizeString), smallerPageSize);
}
private static void testDefaultCodeCacheWith1GbLargePages() throws Exception {
ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder(
"-XX:+UseLargePages",
"-XX:LargePageSizeInBytes=1g",
"-XX:+PrintCodeCache",
"-version");
OutputAnalyzer out = new OutputAnalyzer(pb.start());
out.shouldHaveExitValue(0);
out.shouldContain("CodeHeap 'non-nmethods'");
out.shouldContain("CodeHeap 'profiled nmethods'");
out.shouldContain("CodeHeap 'non-profiled nmethods'");
}
private static void testNonSegmented1GbCodeCacheWith1GbLargePages() throws Exception {
ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder(
"-XX:+UseLargePages",
"-XX:LargePageSizeInBytes=1g",
"-XX:ReservedCodeCacheSize=1g",
"-XX:InitialCodeCacheSize=1g",
"-XX:+PrintCodeCache",
"-Xlog:pagesize=info",
"-version");
OutputAnalyzer out = new OutputAnalyzer(pb.start());
out.shouldHaveExitValue(0);
out.shouldNotContain("CodeHeap 'non-nmethods'");
out.shouldNotContain("CodeHeap 'profiled nmethods'");
out.shouldNotContain("CodeHeap 'non-profiled nmethods'");
out.shouldContain("UseLargePages=1, UseTransparentHugePages=0");
out.shouldMatch("CodeCache: min=1[gG] max=1[gG] base=[^ ]+ size=1[gG] page_size=1[gG]");
}
public static void main(String[] args) throws Exception {
if (isLargePageSizeEqual(LP_1G)) {
testSegmented2GbCodeCacheWith1GbPage();
if (numberOfLargePages(LP_1G) >= 1) {
testDefaultCodeCacheWith1GbLargePages();
testNonSegmented1GbCodeCacheWith1GbLargePages();
} else {
System.out.println("Skipping testDefaultCodeCacheWith1GbLargePages and " +
"testNonSegmented1GbCodeCacheWith1GbLargePages, no 1Gb pages available");
}
} else {
System.out.println("1GB large pages not supported: UseLargePages=" + LARGE_PAGES_ENABLED +
(LARGE_PAGES_ENABLED ? ", largePageSize=" + LARGE_PAGE_SIZE : "") + ". Skipping");
}
}
public static long parseMemoryString(String value) {
value = value.toUpperCase();
long multiplier = 1;
if (value.endsWith("B")) {
multiplier = 1;
} else if (value.endsWith("K")) {
multiplier = 1024;
} else if (value.endsWith("M")) {
multiplier = 1024 * 1024;
} else if (value.endsWith("G")) {
multiplier = 1024 * 1024 * 1024;
} else {
throw new IllegalArgumentException("Expected memory string '" + value + "'to end with either of: B, K, M, G");
}
long longValue = Long.parseUnsignedLong(value.substring(0, value.length() - 1));
return longValue * multiplier;
}
}
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