| /* |
| * Copyright (c) 2015, 2016, 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 TestLargePageUseForAuxMemory.java |
| * @summary Test that auxiliary data structures are allocated using large pages if available. |
| * @bug 8058354 8079208 |
| * @key gc |
| * @modules java.base/jdk.internal.misc |
| * @library /test/lib |
| * @requires vm.gc.G1 |
| * @build sun.hotspot.WhiteBox |
| * @run main ClassFileInstaller sun.hotspot.WhiteBox |
| * sun.hotspot.WhiteBox$WhiteBoxPermission |
| * @run main/othervm -Xbootclasspath/a:. -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+IgnoreUnrecognizedVMOptions -XX:+UseLargePages TestLargePageUseForAuxMemory |
| */ |
| |
| import java.lang.Math; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| |
| import jdk.test.lib.process.OutputAnalyzer; |
| import jdk.test.lib.process.ProcessTools; |
| import jdk.test.lib.Asserts; |
| import jdk.test.lib.Platform; |
| import sun.hotspot.WhiteBox; |
| |
| public class TestLargePageUseForAuxMemory { |
| static final long HEAP_REGION_SIZE = 1 * 1024 * 1024; |
| static long largePageSize; |
| static long smallPageSize; |
| static long allocGranularity; |
| |
| static void checkSize(OutputAnalyzer output, long expectedSize, String pattern) { |
| String pageSizeStr = output.firstMatch(pattern, 1); |
| |
| if (pageSizeStr == null) { |
| output.reportDiagnosticSummary(); |
| throw new RuntimeException("Match from '" + pattern + "' got 'null' expected: " + expectedSize); |
| } |
| |
| long size = parseMemoryString(pageSizeStr); |
| if (size != expectedSize) { |
| output.reportDiagnosticSummary(); |
| throw new RuntimeException("Match from '" + pattern + "' got " + size + " expected: " + expectedSize); |
| } |
| } |
| |
| static void checkSmallTables(OutputAnalyzer output, long expectedPageSize) throws Exception { |
| checkSize(output, expectedPageSize, "Block Offset Table: .*page_size=([^ ]+)"); |
| checkSize(output, expectedPageSize, "Card Counts Table: .*page_size=([^ ]+)"); |
| } |
| |
| static void checkBitmaps(OutputAnalyzer output, long expectedPageSize) throws Exception { |
| checkSize(output, expectedPageSize, "Prev Bitmap: .*page_size=([^ ]+)"); |
| checkSize(output, expectedPageSize, "Next Bitmap: .*page_size=([^ ]+)"); |
| } |
| |
| static void testVM(String what, long heapsize, boolean cardsShouldUseLargePages, boolean bitmapShouldUseLargePages) throws Exception { |
| System.out.println(what + " heapsize " + heapsize + " card table should use large pages " + cardsShouldUseLargePages + " " + |
| "bitmaps should use large pages " + bitmapShouldUseLargePages); |
| ProcessBuilder pb; |
| // Test with large page enabled. |
| pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC", |
| "-XX:G1HeapRegionSize=" + HEAP_REGION_SIZE, |
| "-Xms" + heapsize, |
| "-Xmx" + heapsize, |
| "-Xlog:pagesize", |
| "-XX:+UseLargePages", |
| "-XX:+IgnoreUnrecognizedVMOptions", // there is no ObjectAlignmentInBytes in 32 bit builds |
| "-XX:ObjectAlignmentInBytes=8", |
| "-version"); |
| |
| OutputAnalyzer output = new OutputAnalyzer(pb.start()); |
| checkSmallTables(output, (cardsShouldUseLargePages ? largePageSize : smallPageSize)); |
| checkBitmaps(output, (bitmapShouldUseLargePages ? largePageSize : smallPageSize)); |
| output.shouldHaveExitValue(0); |
| |
| // Test with large page disabled. |
| pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC", |
| "-XX:G1HeapRegionSize=" + HEAP_REGION_SIZE, |
| "-Xms" + heapsize, |
| "-Xmx" + heapsize, |
| "-Xlog:pagesize", |
| "-XX:-UseLargePages", |
| "-XX:+IgnoreUnrecognizedVMOptions", // there is no ObjectAlignmentInBytes in 32 bit builds |
| "-XX:ObjectAlignmentInBytes=8", |
| "-version"); |
| |
| output = new OutputAnalyzer(pb.start()); |
| checkSmallTables(output, smallPageSize); |
| checkBitmaps(output, smallPageSize); |
| output.shouldHaveExitValue(0); |
| } |
| |
| private static long gcd(long x, long y) { |
| while (x > 0) { |
| long t = x; |
| x = y % x; |
| y = t; |
| } |
| return y; |
| } |
| |
| private static long lcm(long x, long y) { |
| return x * (y / gcd(x, y)); |
| } |
| |
| public static void main(String[] args) throws Exception { |
| // Size that a single card covers. |
| final int cardSize = 512; |
| WhiteBox wb = WhiteBox.getWhiteBox(); |
| smallPageSize = wb.getVMPageSize(); |
| largePageSize = wb.getVMLargePageSize(); |
| allocGranularity = wb.getVMAllocationGranularity(); |
| final long heapAlignment = lcm(cardSize * smallPageSize, largePageSize); |
| |
| if (largePageSize == 0) { |
| System.out.println("Skip tests because large page support does not seem to be available on this platform."); |
| return; |
| } |
| if (largePageSize == smallPageSize) { |
| System.out.println("Skip tests because large page support does not seem to be available on this platform." + |
| "Small and large page size are the same."); |
| return; |
| } |
| |
| // To get large pages for the card table etc. we need at least a 1G heap (with 4k page size). |
| // 32 bit systems will have problems reserving such an amount of contiguous space, so skip the |
| // test there. |
| if (!Platform.is32bit()) { |
| final long heapSizeForCardTableUsingLargePages = largePageSize * cardSize; |
| final long heapSizeDiffForCardTable = Math.max(Math.max(allocGranularity * cardSize, HEAP_REGION_SIZE), largePageSize); |
| |
| Asserts.assertGT(heapSizeForCardTableUsingLargePages, heapSizeDiffForCardTable, |
| "To test we would require to use an invalid heap size"); |
| testVM("case1: card table and bitmap use large pages (barely)", heapSizeForCardTableUsingLargePages, true, true); |
| testVM("case2: card table and bitmap use large pages (extra slack)", heapSizeForCardTableUsingLargePages + heapSizeDiffForCardTable, true, true); |
| testVM("case3: only bitmap uses large pages (barely not)", heapSizeForCardTableUsingLargePages - heapSizeDiffForCardTable, false, true); |
| } |
| |
| // Minimum heap requirement to get large pages for bitmaps is 128M heap. This seems okay to test |
| // everywhere. |
| final int bitmapTranslationFactor = 8 * 8; // ObjectAlignmentInBytes * BitsPerByte |
| final long heapSizeForBitmapUsingLargePages = largePageSize * bitmapTranslationFactor; |
| final long heapSizeDiffForBitmap = Math.max(Math.max(allocGranularity * bitmapTranslationFactor, HEAP_REGION_SIZE), |
| Math.max(largePageSize, heapAlignment)); |
| |
| Asserts.assertGT(heapSizeForBitmapUsingLargePages, heapSizeDiffForBitmap, |
| "To test we would require to use an invalid heap size"); |
| |
| testVM("case4: only bitmap uses large pages (barely)", heapSizeForBitmapUsingLargePages, false, true); |
| testVM("case5: only bitmap uses large pages (extra slack)", heapSizeForBitmapUsingLargePages + heapSizeDiffForBitmap, false, true); |
| testVM("case6: nothing uses large pages (barely not)", heapSizeForBitmapUsingLargePages - heapSizeDiffForBitmap, false, false); |
| } |
| |
| public static long parseMemoryString(String value) { |
| 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; |
| } |
| } |