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 /test/lib
31 * @requires vm.gc.G1
32 * @build sun.hotspot.WhiteBox
33 * @run main ClassFileInstaller sun.hotspot.WhiteBox
34 * sun.hotspot.WhiteBox$WhiteBoxPermission
35 * @run main/othervm -Xbootclasspath/a:. -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+IgnoreUnrecognizedVMOptions -XX:+UseLargePages TestLargePageUseForAuxMemory
36 */
37
38 import java.lang.Math;
39 import java.lang.reflect.InvocationTargetException;
40 import java.lang.reflect.Method;
41
42 import jdk.test.lib.process.OutputAnalyzer;
43 import jdk.test.lib.process.ProcessTools;
44 import jdk.test.lib.Asserts;
45 import jdk.test.lib.Platform;
46 import sun.hotspot.WhiteBox;
47
48 public class TestLargePageUseForAuxMemory {
49 static final long HEAP_REGION_SIZE = 1 * 1024 * 1024;
50 static long largePageSize;
51 static long smallPageSize;
52 static long allocGranularity;
53
54 static void checkSize(OutputAnalyzer output, long expectedSize, String pattern) {
55 String pageSizeStr = output.firstMatch(pattern, 1);
56
57 if (pageSizeStr == null) {
58 output.reportDiagnosticSummary();
59 throw new RuntimeException("Match from '" + pattern + "' got 'null' expected: " + expectedSize);
60 }
61
62 long size = parseMemoryString(pageSizeStr);
63 if (size != expectedSize) {
64 output.reportDiagnosticSummary();
65 throw new RuntimeException("Match from '" + pattern + "' got " + size + " expected: " + expectedSize);
66 }
67 }
68
69 static void checkSmallTables(OutputAnalyzer output, long expectedPageSize) throws Exception {
70 checkSize(output, expectedPageSize, "Block Offset Table: .*page_size=([^ ]+)");
71 checkSize(output, expectedPageSize, "Card Counts Table: .*page_size=([^ ]+)");
72 }
73
74 static void checkBitmaps(OutputAnalyzer output, long expectedPageSize) throws Exception {
75 checkSize(output, expectedPageSize, "Prev Bitmap: .*page_size=([^ ]+)");
76 checkSize(output, expectedPageSize, "Next Bitmap: .*page_size=([^ ]+)");
77 }
78
79 static void testVM(String what, long heapsize, boolean cardsShouldUseLargePages, boolean bitmapShouldUseLargePages) throws Exception {
80 System.out.println(what + " heapsize " + heapsize + " card table should use large pages " + cardsShouldUseLargePages + " " +
81 "bitmaps should use large pages " + bitmapShouldUseLargePages);
82 ProcessBuilder pb;
83 // Test with large page enabled.
84 pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC",
85 "-XX:G1HeapRegionSize=" + HEAP_REGION_SIZE,
86 "-Xms" + heapsize,
87 "-Xmx" + heapsize,
88 "-Xlog:pagesize",
89 "-XX:+UseLargePages",
90 "-XX:+IgnoreUnrecognizedVMOptions", // there is no ObjectAlignmentInBytes in 32 bit builds
91 "-XX:ObjectAlignmentInBytes=8",
92 "-version");
93
94 OutputAnalyzer output = new OutputAnalyzer(pb.start());
95 checkSmallTables(output, (cardsShouldUseLargePages ? largePageSize : smallPageSize));
96 checkBitmaps(output, (bitmapShouldUseLargePages ? largePageSize : smallPageSize));
97 output.shouldHaveExitValue(0);
98
99 // Test with large page disabled.
100 pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC",
101 "-XX:G1HeapRegionSize=" + HEAP_REGION_SIZE,
102 "-Xms" + heapsize,
103 "-Xmx" + heapsize,
104 "-Xlog:pagesize",
105 "-XX:-UseLargePages",
106 "-XX:+IgnoreUnrecognizedVMOptions", // there is no ObjectAlignmentInBytes in 32 bit builds
107 "-XX:ObjectAlignmentInBytes=8",
108 "-version");
109
110 output = new OutputAnalyzer(pb.start());
111 checkSmallTables(output, smallPageSize);
112 checkBitmaps(output, smallPageSize);
113 output.shouldHaveExitValue(0);
114 }
115
116 private static long gcd(long x, long y) {
117 while (x > 0) {
118 long t = x;
119 x = y % x;
120 y = t;
121 }
122 return y;
123 }
124
125 private static long lcm(long x, long y) {
126 return x * (y / gcd(x, y));
127 }
128
129 public static void main(String[] args) throws Exception {
130 // Size that a single card covers.
131 final int cardSize = 512;
132 WhiteBox wb = WhiteBox.getWhiteBox();
133 smallPageSize = wb.getVMPageSize();
134 largePageSize = wb.getVMLargePageSize();
135 allocGranularity = wb.getVMAllocationGranularity();
136 final long heapAlignment = lcm(cardSize * smallPageSize, largePageSize);
137
138 if (largePageSize == 0) {
139 System.out.println("Skip tests because large page support does not seem to be available on this platform.");
140 return;
141 }
142 if (largePageSize == smallPageSize) {
143 System.out.println("Skip tests because large page support does not seem to be available on this platform." +
144 "Small and large page size are the same.");
145 return;
146 }
147
148 // To get large pages for the card table etc. we need at least a 1G heap (with 4k page size).
149 // 32 bit systems will have problems reserving such an amount of contiguous space, so skip the
150 // test there.
151 if (!Platform.is32bit()) {
152 final long heapSizeForCardTableUsingLargePages = largePageSize * cardSize;
153 final long heapSizeDiffForCardTable = Math.max(Math.max(allocGranularity * cardSize, HEAP_REGION_SIZE), largePageSize);
154
155 Asserts.assertGT(heapSizeForCardTableUsingLargePages, heapSizeDiffForCardTable,
156 "To test we would require to use an invalid heap size");
157 testVM("case1: card table and bitmap use large pages (barely)", heapSizeForCardTableUsingLargePages, true, true);
158 testVM("case2: card table and bitmap use large pages (extra slack)", heapSizeForCardTableUsingLargePages + heapSizeDiffForCardTable, true, true);
159 testVM("case3: only bitmap uses large pages (barely not)", heapSizeForCardTableUsingLargePages - heapSizeDiffForCardTable, false, true);
160 }
161
162 // Minimum heap requirement to get large pages for bitmaps is 128M heap. This seems okay to test
163 // everywhere.
164 final int bitmapTranslationFactor = 8 * 8; // ObjectAlignmentInBytes * BitsPerByte
165 final long heapSizeForBitmapUsingLargePages = largePageSize * bitmapTranslationFactor;
166 final long heapSizeDiffForBitmap = Math.max(Math.max(allocGranularity * bitmapTranslationFactor, HEAP_REGION_SIZE),
167 Math.max(largePageSize, heapAlignment));
168
169 Asserts.assertGT(heapSizeForBitmapUsingLargePages, heapSizeDiffForBitmap,
170 "To test we would require to use an invalid heap size");
171
172 testVM("case4: only bitmap uses large pages (barely)", heapSizeForBitmapUsingLargePages, false, true);
173 testVM("case5: only bitmap uses large pages (extra slack)", heapSizeForBitmapUsingLargePages + heapSizeDiffForBitmap, false, true);
174 testVM("case6: nothing uses large pages (barely not)", heapSizeForBitmapUsingLargePages - heapSizeDiffForBitmap, false, false);
175 }
176
177 public static long parseMemoryString(String value) {
178 long multiplier = 1;
179
180 if (value.endsWith("B")) {
181 multiplier = 1;
182 } else if (value.endsWith("K")) {
183 multiplier = 1024;
184 } else if (value.endsWith("M")) {
185 multiplier = 1024 * 1024;
186 } else if (value.endsWith("G")) {
187 multiplier = 1024 * 1024 * 1024;
188 } else {
189 throw new IllegalArgumentException("Expected memory string '" + value + "'to end with either of: B, K, M, G");
190 }
191
192 long longValue = Long.parseUnsignedLong(value.substring(0, value.length() - 1));
193
194 return longValue * multiplier;
195 }
196 }