1 /* 2 * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* 25 * @test TestLargePageUseForAuxMemory.java 26 * @summary Test that auxiliary data structures are allocated using large pages if available. 27 * @bug 8058354 8079208 28 * @key gc 29 * @modules java.base/jdk.internal.misc 30 * @library /testlibrary /test/lib 31 * @requires vm.gc.G1 32 * @build jdk.test.lib.* sun.hotspot.WhiteBox 33 * @build TestLargePageUseForAuxMemory 34 * @run main ClassFileInstaller sun.hotspot.WhiteBox 35 * sun.hotspot.WhiteBox$WhiteBoxPermission 36 * @run main/othervm -Xbootclasspath/a:. -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+IgnoreUnrecognizedVMOptions -XX:+UseLargePages TestLargePageUseForAuxMemory 37 */ 38 39 import java.lang.Math; 40 import java.lang.reflect.InvocationTargetException; 41 import java.lang.reflect.Method; 42 43 import jdk.test.lib.*; 44 import jdk.test.lib.Asserts; 45 import sun.hotspot.WhiteBox; 46 47 public class TestLargePageUseForAuxMemory { 48 static final long HEAP_REGION_SIZE = 1 * 1024 * 1024; 49 static long largePageSize; 50 static long smallPageSize; 51 static long allocGranularity; 52 53 static void checkSize(OutputAnalyzer output, long expectedSize, String pattern) { 54 String pageSizeStr = output.firstMatch(pattern, 1); 55 56 if (pageSizeStr == null) { 57 output.reportDiagnosticSummary(); 58 throw new RuntimeException("Match from '" + pattern + "' got 'null' expected: " + expectedSize); 59 } 60 61 long size = parseMemoryString(pageSizeStr); 62 if (size != expectedSize) { 63 output.reportDiagnosticSummary(); 64 throw new RuntimeException("Match from '" + pattern + "' got " + size + " expected: " + expectedSize); 65 } 66 } 67 68 static void checkSmallTables(OutputAnalyzer output, long expectedPageSize) throws Exception { 69 checkSize(output, expectedPageSize, "Block Offset Table: .*page_size=([^ ]+)"); 70 checkSize(output, expectedPageSize, "Card Counts Table: .*page_size=([^ ]+)"); 71 } 72 73 static void checkBitmaps(OutputAnalyzer output, long expectedPageSize) throws Exception { 74 checkSize(output, expectedPageSize, "Prev Bitmap: .*page_size=([^ ]+)"); 75 checkSize(output, expectedPageSize, "Next Bitmap: .*page_size=([^ ]+)"); 76 } 77 78 static void testVM(String what, long heapsize, boolean cardsShouldUseLargePages, boolean bitmapShouldUseLargePages) throws Exception { 79 System.out.println(what + " heapsize " + heapsize + " card table should use large pages " + cardsShouldUseLargePages + " " + 80 "bitmaps should use large pages " + bitmapShouldUseLargePages); 81 ProcessBuilder pb; 82 // Test with large page enabled. 83 pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC", 84 "-XX:G1HeapRegionSize=" + HEAP_REGION_SIZE, 85 "-Xms" + heapsize, 86 "-Xmx" + heapsize, 87 "-Xlog:pagesize", 88 "-XX:+UseLargePages", 89 "-XX:+IgnoreUnrecognizedVMOptions", // there is no ObjectAlignmentInBytes in 32 bit builds 90 "-XX:ObjectAlignmentInBytes=8", 91 "-version"); 92 93 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 94 checkSmallTables(output, (cardsShouldUseLargePages ? largePageSize : smallPageSize)); 95 checkBitmaps(output, (bitmapShouldUseLargePages ? largePageSize : smallPageSize)); 96 output.shouldHaveExitValue(0); 97 98 // Test with large page disabled. 99 pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC", 100 "-XX:G1HeapRegionSize=" + HEAP_REGION_SIZE, 101 "-Xms" + heapsize, 102 "-Xmx" + heapsize, 103 "-Xlog:pagesize", 104 "-XX:-UseLargePages", 105 "-XX:+IgnoreUnrecognizedVMOptions", // there is no ObjectAlignmentInBytes in 32 bit builds 106 "-XX:ObjectAlignmentInBytes=8", 107 "-version"); 108 109 output = new OutputAnalyzer(pb.start()); 110 checkSmallTables(output, smallPageSize); 111 checkBitmaps(output, smallPageSize); 112 output.shouldHaveExitValue(0); 113 } 114 115 private static long gcd(long x, long y) { 116 while (x > 0) { 117 long t = x; 118 x = y % x; 119 y = t; 120 } 121 return y; 122 } 123 124 private static long lcm(long x, long y) { 125 return x * (y / gcd(x, y)); 126 } 127 128 public static void main(String[] args) throws Exception { 129 // Size that a single card covers. 130 final int cardSize = 512; 131 WhiteBox wb = WhiteBox.getWhiteBox(); 132 smallPageSize = wb.getVMPageSize(); 133 largePageSize = wb.getVMLargePageSize(); 134 allocGranularity = wb.getVMAllocationGranularity(); 135 final long heapAlignment = lcm(cardSize * smallPageSize, largePageSize); 136 137 if (largePageSize == 0) { 138 System.out.println("Skip tests because large page support does not seem to be available on this platform."); 139 return; 140 } 141 if (largePageSize == smallPageSize) { 142 System.out.println("Skip tests because large page support does not seem to be available on this platform." + 143 "Small and large page size are the same."); 144 return; 145 } 146 147 // To get large pages for the card table etc. we need at least a 1G heap (with 4k page size). 148 // 32 bit systems will have problems reserving such an amount of contiguous space, so skip the 149 // test there. 150 if (!Platform.is32bit()) { 151 final long heapSizeForCardTableUsingLargePages = largePageSize * cardSize; 152 final long heapSizeDiffForCardTable = Math.max(Math.max(allocGranularity * cardSize, HEAP_REGION_SIZE), largePageSize); 153 154 Asserts.assertGT(heapSizeForCardTableUsingLargePages, heapSizeDiffForCardTable, 155 "To test we would require to use an invalid heap size"); 156 testVM("case1: card table and bitmap use large pages (barely)", heapSizeForCardTableUsingLargePages, true, true); 157 testVM("case2: card table and bitmap use large pages (extra slack)", heapSizeForCardTableUsingLargePages + heapSizeDiffForCardTable, true, true); 158 testVM("case3: only bitmap uses large pages (barely not)", heapSizeForCardTableUsingLargePages - heapSizeDiffForCardTable, false, true); 159 } 160 161 // Minimum heap requirement to get large pages for bitmaps is 128M heap. This seems okay to test 162 // everywhere. 163 final int bitmapTranslationFactor = 8 * 8; // ObjectAlignmentInBytes * BitsPerByte 164 final long heapSizeForBitmapUsingLargePages = largePageSize * bitmapTranslationFactor; 165 final long heapSizeDiffForBitmap = Math.max(Math.max(allocGranularity * bitmapTranslationFactor, HEAP_REGION_SIZE), 166 Math.max(largePageSize, heapAlignment)); 167 168 Asserts.assertGT(heapSizeForBitmapUsingLargePages, heapSizeDiffForBitmap, 169 "To test we would require to use an invalid heap size"); 170 171 testVM("case4: only bitmap uses large pages (barely)", heapSizeForBitmapUsingLargePages, false, true); 172 testVM("case5: only bitmap uses large pages (extra slack)", heapSizeForBitmapUsingLargePages + heapSizeDiffForBitmap, false, true); 173 testVM("case6: nothing uses large pages (barely not)", heapSizeForBitmapUsingLargePages - heapSizeDiffForBitmap, false, false); 174 } 175 176 public static long parseMemoryString(String value) { 177 long multiplier = 1; 178 179 if (value.endsWith("B")) { 180 multiplier = 1; 181 } else if (value.endsWith("K")) { 182 multiplier = 1024; 183 } else if (value.endsWith("M")) { 184 multiplier = 1024 * 1024; 185 } else if (value.endsWith("G")) { 186 multiplier = 1024 * 1024 * 1024; 187 } else { 188 throw new IllegalArgumentException("Expected memory string '" + value + "'to end with either of: B, K, M, G"); 189 } 190 191 long longValue = Long.parseUnsignedLong(value.substring(0, value.length() - 1)); 192 193 return longValue * multiplier; 194 } 195 }