1 /*
2 * Copyright (c) 2015, 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 * @library /testlibrary /test/lib
30 * @requires (vm.gc=="G1" | vm.gc=="null")
31 * @build jdk.test.lib.* sun.hotspot.WhiteBox
32 * @build TestLargePageUseForAuxMemory
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.*;
43 import jdk.test.lib.Asserts;
44 import sun.hotspot.WhiteBox;
45
46 public class TestLargePageUseForAuxMemory {
47 static final long HEAP_REGION_SIZE = 1 * 1024 * 1024;
48 static long largePageSize;
49 static long smallPageSize;
50 static long allocGranularity;
51
52 static void checkSize(OutputAnalyzer output, long expectedSize, String pattern) {
53 String pageSizeStr = output.firstMatch(pattern, 1);
54
55 if (pageSizeStr == null) {
56 output.reportDiagnosticSummary();
57 throw new RuntimeException("Match from '" + pattern + "' got 'null' expected: " + expectedSize);
58 }
59
60 long size = parseMemoryString(pageSizeStr);
61 if (size != expectedSize) {
62 output.reportDiagnosticSummary();
63 throw new RuntimeException("Match from '" + pattern + "' got " + size + " expected: " + expectedSize);
64 }
65 }
66
67 static void checkSmallTables(OutputAnalyzer output, long expectedPageSize) throws Exception {
68 checkSize(output, expectedPageSize, "Block Offset Table: .*page_size=([^ ]+)");
69 checkSize(output, expectedPageSize, "Card Counts Table: .*page_size=([^ ]+)");
70 }
71
72 static void checkBitmaps(OutputAnalyzer output, long expectedPageSize) throws Exception {
73 checkSize(output, expectedPageSize, "Prev Bitmap: .*page_size=([^ ]+)");
74 checkSize(output, expectedPageSize, "Next Bitmap: .*page_size=([^ ]+)");
75 }
76
77 static void testVM(String what, long heapsize, boolean cardsShouldUseLargePages, boolean bitmapShouldUseLargePages) throws Exception {
78 System.out.println(what + " heapsize " + heapsize + " card table should use large pages " + cardsShouldUseLargePages + " " +
79 "bitmaps should use large pages " + bitmapShouldUseLargePages);
80 ProcessBuilder pb;
81 // Test with large page enabled.
82 pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC",
83 "-XX:G1HeapRegionSize=" + HEAP_REGION_SIZE,
84 "-Xms" + heapsize,
85 "-Xmx" + heapsize,
86 "-Xlog:pagesize",
87 "-XX:+UseLargePages",
88 "-XX:+IgnoreUnrecognizedVMOptions", // there is no ObjectAlignmentInBytes in 32 bit builds
89 "-XX:ObjectAlignmentInBytes=8",
90 "-version");
91
92 OutputAnalyzer output = new OutputAnalyzer(pb.start());
93 checkSmallTables(output, (cardsShouldUseLargePages ? largePageSize : smallPageSize));
94 checkBitmaps(output, (bitmapShouldUseLargePages ? largePageSize : smallPageSize));
95 output.shouldHaveExitValue(0);
96
97 // Test with large page disabled.
98 pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC",
99 "-XX:G1HeapRegionSize=" + HEAP_REGION_SIZE,
100 "-Xms" + heapsize,
101 "-Xmx" + heapsize,
102 "-Xlog:pagesize",
103 "-XX:-UseLargePages",
104 "-XX:+IgnoreUnrecognizedVMOptions", // there is no ObjectAlignmentInBytes in 32 bit builds
105 "-XX:ObjectAlignmentInBytes=8",
106 "-version");
107
108 output = new OutputAnalyzer(pb.start());
109 checkSmallTables(output, smallPageSize);
110 checkBitmaps(output, smallPageSize);
111 output.shouldHaveExitValue(0);
112 }
113
114 private static long gcd(long x, long y) {
115 while (x > 0) {
116 long t = x;
117 x = y % x;
118 y = t;
119 }
120 return y;
121 }
122
123 private static long lcm(long x, long y) {
124 return x * (y / gcd(x, y));
125 }
126
127 public static void main(String[] args) throws Exception {
128 // Size that a single card covers.
129 final int cardSize = 512;
130 WhiteBox wb = WhiteBox.getWhiteBox();
131 smallPageSize = wb.getVMPageSize();
132 largePageSize = wb.getVMLargePageSize();
133 allocGranularity = wb.getVMAllocationGranularity();
134 final long heapAlignment = lcm(cardSize * smallPageSize, largePageSize);
135
136 if (largePageSize == 0) {
137 System.out.println("Skip tests because large page support does not seem to be available on this platform.");
138 return;
139 }
140 if (largePageSize == smallPageSize) {
141 System.out.println("Skip tests because large page support does not seem to be available on this platform." +
142 "Small and large page size are the same.");
143 return;
144 }
145
146 // To get large pages for the card table etc. we need at least a 1G heap (with 4k page size).
147 // 32 bit systems will have problems reserving such an amount of contiguous space, so skip the
148 // test there.
149 if (!Platform.is32bit()) {
150 final long heapSizeForCardTableUsingLargePages = largePageSize * cardSize;
151 final long heapSizeDiffForCardTable = Math.max(Math.max(allocGranularity * cardSize, HEAP_REGION_SIZE), largePageSize);
152
153 Asserts.assertGT(heapSizeForCardTableUsingLargePages, heapSizeDiffForCardTable,
154 "To test we would require to use an invalid heap size");
155 testVM("case1: card table and bitmap use large pages (barely)", heapSizeForCardTableUsingLargePages, true, true);
156 testVM("case2: card table and bitmap use large pages (extra slack)", heapSizeForCardTableUsingLargePages + heapSizeDiffForCardTable, true, true);
157 testVM("case3: only bitmap uses large pages (barely not)", heapSizeForCardTableUsingLargePages - heapSizeDiffForCardTable, false, true);
158 }
159
160 // Minimum heap requirement to get large pages for bitmaps is 128M heap. This seems okay to test
161 // everywhere.
162 final int bitmapTranslationFactor = 8 * 8; // ObjectAlignmentInBytes * BitsPerByte
163 final long heapSizeForBitmapUsingLargePages = largePageSize * bitmapTranslationFactor;
164 final long heapSizeDiffForBitmap = Math.max(Math.max(allocGranularity * bitmapTranslationFactor, HEAP_REGION_SIZE),
165 Math.max(largePageSize, heapAlignment));
166
167 Asserts.assertGT(heapSizeForBitmapUsingLargePages, heapSizeDiffForBitmap,
168 "To test we would require to use an invalid heap size");
169
170 testVM("case4: only bitmap uses large pages (barely)", heapSizeForBitmapUsingLargePages, false, true);
171 testVM("case5: only bitmap uses large pages (extra slack)", heapSizeForBitmapUsingLargePages + heapSizeDiffForBitmap, false, true);
172 testVM("case6: nothing uses large pages (barely not)", heapSizeForBitmapUsingLargePages - heapSizeDiffForBitmap, false, false);
173 }
174
175 public static long parseMemoryString(String value) {
176 long multiplier = 1;
177
178 if (value.endsWith("B")) {
179 multiplier = 1;
180 } else if (value.endsWith("K")) {
181 multiplier = 1024;
182 } else if (value.endsWith("M")) {
183 multiplier = 1024 * 1024;
184 } else if (value.endsWith("G")) {
185 multiplier = 1024 * 1024 * 1024;
186 } else {
187 throw new IllegalArgumentException("Expected memory string '" + value + "'to end with either of: B, K, M, G");
188 }
189
190 long longValue = Long.parseUnsignedLong(value.substring(0, value.length() - 1));
191
192 return longValue * multiplier;
193 }
194 }