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
40 import jdk.test.lib.*;
41 import jdk.test.lib.Asserts;
42 import sun.hotspot.WhiteBox;
43
44 public class TestLargePageUseForAuxMemory {
45 static final long HEAP_REGION_SIZE = 1 * 1024 * 1024;
46 static long largePageSize;
47 static long smallPageSize;
48 static long allocGranularity;
49
50 static void checkSmallTables(OutputAnalyzer output, long expectedPageSize) throws Exception {
51 output.shouldContain("G1 'Block offset table': pg_sz=" + expectedPageSize);
52 output.shouldContain("G1 'Card counts table': pg_sz=" + expectedPageSize);
53 }
54
55 static void checkBitmaps(OutputAnalyzer output, long expectedPageSize) throws Exception {
56 output.shouldContain("G1 'Prev Bitmap': pg_sz=" + expectedPageSize);
57 output.shouldContain("G1 'Next Bitmap': pg_sz=" + expectedPageSize);
58 }
59
60 static void testVM(String what, long heapsize, boolean cardsShouldUseLargePages, boolean bitmapShouldUseLargePages) throws Exception {
61 System.out.println(what + " heapsize " + heapsize + " card table should use large pages " + cardsShouldUseLargePages + " " +
62 "bitmaps should use large pages " + bitmapShouldUseLargePages);
63 ProcessBuilder pb;
64 // Test with large page enabled.
65 pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC",
66 "-XX:G1HeapRegionSize=" + HEAP_REGION_SIZE,
67 "-Xms" + heapsize,
68 "-Xmx" + heapsize,
69 "-XX:+TracePageSizes",
70 "-XX:+UseLargePages",
71 "-XX:+IgnoreUnrecognizedVMOptions", // there is no ObjectAlignmentInBytes in 32 bit builds
72 "-XX:ObjectAlignmentInBytes=8",
73 "-version");
74
75 OutputAnalyzer output = new OutputAnalyzer(pb.start());
76 checkSmallTables(output, (cardsShouldUseLargePages ? largePageSize : smallPageSize));
77 checkBitmaps(output, (bitmapShouldUseLargePages ? largePageSize : smallPageSize));
78 output.shouldHaveExitValue(0);
79
80 // Test with large page disabled.
81 pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC",
82 "-XX:G1HeapRegionSize=" + HEAP_REGION_SIZE,
83 "-Xms" + heapsize,
84 "-Xmx" + heapsize,
85 "-XX:+TracePageSizes",
86 "-XX:-UseLargePages",
87 "-XX:+IgnoreUnrecognizedVMOptions", // there is no ObjectAlignmentInBytes in 32 bit builds
88 "-XX:ObjectAlignmentInBytes=8",
89 "-version");
90
91 output = new OutputAnalyzer(pb.start());
92 checkSmallTables(output, smallPageSize);
93 checkBitmaps(output, smallPageSize);
94 output.shouldHaveExitValue(0);
95 }
96
97 private static long gcd(long x, long y) {
98 while (x > 0) {
99 long t = x;
100 x = y % x;
101 y = t;
102 }
103 return y;
104 }
105
106 private static long lcm(long x, long y) {
107 return x * (y / gcd(x, y));
108 }
109
110 public static void main(String[] args) throws Exception {
111 if (!Platform.isDebugBuild()) {
112 System.out.println("Skip tests on non-debug builds because the required option TracePageSizes is a debug-only option.");
113 return;
114 }
115
116 // Size that a single card covers.
117 final int cardSize = 512;
118 WhiteBox wb = WhiteBox.getWhiteBox();
119 smallPageSize = wb.getVMPageSize();
120 largePageSize = wb.getVMLargePageSize();
121 allocGranularity = wb.getVMAllocationGranularity();
122 final long heapAlignment = lcm(cardSize * smallPageSize, largePageSize);
123
124 if (largePageSize == 0) {
125 System.out.println("Skip tests because large page support does not seem to be available on this platform.");
126 return;
127 }
128 if (largePageSize == smallPageSize) {
129 System.out.println("Skip tests because large page support does not seem to be available on this platform." +
130 "Small and large page size are the same.");
131 return;
132 }
133
134 // To get large pages for the card table etc. we need at least a 1G heap (with 4k page size).
135 // 32 bit systems will have problems reserving such an amount of contiguous space, so skip the
136 // test there.
137 if (!Platform.is32bit()) {
138 final long heapSizeForCardTableUsingLargePages = largePageSize * cardSize;
139 final long heapSizeDiffForCardTable = Math.max(Math.max(allocGranularity * cardSize, HEAP_REGION_SIZE), largePageSize);
140
141 Asserts.assertGT(heapSizeForCardTableUsingLargePages, heapSizeDiffForCardTable,
142 "To test we would require to use an invalid heap size");
143 testVM("case1: card table and bitmap use large pages (barely)", heapSizeForCardTableUsingLargePages, true, true);
144 testVM("case2: card table and bitmap use large pages (extra slack)", heapSizeForCardTableUsingLargePages + heapSizeDiffForCardTable, true, true);
145 testVM("case3: only bitmap uses large pages (barely not)", heapSizeForCardTableUsingLargePages - heapSizeDiffForCardTable, false, true);
146 }
147
148 // Minimum heap requirement to get large pages for bitmaps is 128M heap. This seems okay to test
149 // everywhere.
150 final int bitmapTranslationFactor = 8 * 8; // ObjectAlignmentInBytes * BitsPerByte
151 final long heapSizeForBitmapUsingLargePages = largePageSize * bitmapTranslationFactor;
152 final long heapSizeDiffForBitmap = Math.max(Math.max(allocGranularity * bitmapTranslationFactor, HEAP_REGION_SIZE),
153 Math.max(largePageSize, heapAlignment));
154
155 Asserts.assertGT(heapSizeForBitmapUsingLargePages, heapSizeDiffForBitmap,
156 "To test we would require to use an invalid heap size");
157
158 testVM("case4: only bitmap uses large pages (barely)", heapSizeForBitmapUsingLargePages, false, true);
159 testVM("case5: only bitmap uses large pages (extra slack)", heapSizeForBitmapUsingLargePages + heapSizeDiffForBitmap, false, true);
160 testVM("case6: nothing uses large pages (barely not)", heapSizeForBitmapUsingLargePages - heapSizeDiffForBitmap, false, false);
161 }
162 }