1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
|
/*
* Copyright (c) 2014, 2025, 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 CheckSegmentedCodeCache
* @bug 8015774
* @summary Checks VM options related to the segmented code cache
* @library /test/lib
* @requires vm.flagless
*
* @build jdk.test.whitebox.WhiteBox
* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
* -XX:+WhiteBoxAPI
* compiler.codecache.CheckSegmentedCodeCache
*/
package compiler.codecache;
import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.Platform;
import jdk.test.lib.process.ProcessTools;
import jdk.test.whitebox.WhiteBox;
public class CheckSegmentedCodeCache {
private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
// Code heap names
private static final String NON_METHOD = "CodeHeap 'non-nmethods'";
private static final String PROFILED = "CodeHeap 'profiled nmethods'";
private static final String NON_PROFILED = "CodeHeap 'non-profiled nmethods'";
private static void verifySegmentedCodeCache(ProcessBuilder pb, boolean enabled) throws Exception {
OutputAnalyzer out = new OutputAnalyzer(pb.start());
out.shouldHaveExitValue(0);
if (enabled) {
try {
// Non-nmethod code heap should be always available with the segmented code cache
out.shouldContain(NON_METHOD);
} catch (RuntimeException e) {
// Check if TieredCompilation is disabled (in a client VM)
if (Platform.isTieredSupported()) {
// Code cache is not segmented
throw new RuntimeException("No code cache segmentation.");
}
}
} else {
out.shouldNotContain(NON_METHOD);
}
}
private static void verifyCodeHeapNotExists(ProcessBuilder pb, String... heapNames) throws Exception {
OutputAnalyzer out = new OutputAnalyzer(pb.start());
out.shouldHaveExitValue(0);
for (String name : heapNames) {
out.shouldNotContain(name);
}
}
private static void failsWith(ProcessBuilder pb, String message) throws Exception {
OutputAnalyzer out = new OutputAnalyzer(pb.start());
out.shouldContain(message);
out.shouldHaveExitValue(1);
}
private static void verifyCodeHeapSize(ProcessBuilder pb, String heapName, long heapSize) throws Exception {
OutputAnalyzer out = new OutputAnalyzer(pb.start());
out.shouldHaveExitValue(0);
long actualHeapSize = Long.parseLong(out.firstMatch(heapName + "\\s+=\\s(\\d+)", 1));
if (heapSize != actualHeapSize) {
throw new RuntimeException("Unexpected " + heapName + " size: " + actualHeapSize + " != " + heapSize);
}
// Sanity checks:
// - segment sizes are aligned to at least 1KB
// - sum of segment sizes equals ReservedCodeCacheSize
long nonNMethodCodeHeapSize = Long.parseLong(out.firstMatch("NonNMethodCodeHeapSize\\s+=\\s(\\d+)", 1));
long nonProfiledCodeHeapSize = Long.parseLong(out.firstMatch("NonProfiledCodeHeapSize\\s+=\\s(\\d+)", 1));
long profiledCodeHeapSize = Long.parseLong(out.firstMatch(" ProfiledCodeHeapSize\\s+=\\s(\\d+)", 1));
long reservedCodeCacheSize = Long.parseLong(out.firstMatch("ReservedCodeCacheSize\\s+=\\s(\\d+)", 1));
if (reservedCodeCacheSize != nonNMethodCodeHeapSize + nonProfiledCodeHeapSize + profiledCodeHeapSize) {
throw new RuntimeException("Unexpected segments size sum: " + reservedCodeCacheSize + " != " +
nonNMethodCodeHeapSize + "+" + nonProfiledCodeHeapSize + "+" + profiledCodeHeapSize);
}
if ((reservedCodeCacheSize % 1024 != 0) || (nonNMethodCodeHeapSize % 1024 != 0) ||
(nonProfiledCodeHeapSize % 1024 != 0) || (profiledCodeHeapSize % 1024 != 0)) {
throw new RuntimeException("Unexpected segments size alignment: " + reservedCodeCacheSize + ", " +
nonNMethodCodeHeapSize + ", " + nonProfiledCodeHeapSize + ", " + profiledCodeHeapSize);
}
}
/**
* Check the result of segmented code cache related VM options.
*/
public static void main(String[] args) throws Exception {
ProcessBuilder pb;
// Disabled with ReservedCodeCacheSize < 240MB
pb = ProcessTools.createLimitedTestJavaProcessBuilder("-XX:ReservedCodeCacheSize=239m",
"-XX:+PrintCodeCache",
"-version");
verifySegmentedCodeCache(pb, false);
// Disabled without TieredCompilation
pb = ProcessTools.createLimitedTestJavaProcessBuilder("-XX:-TieredCompilation",
"-XX:+PrintCodeCache",
"-version");
verifySegmentedCodeCache(pb, false);
// Enabled with TieredCompilation and ReservedCodeCacheSize >= 240MB
pb = ProcessTools.createLimitedTestJavaProcessBuilder("-XX:+TieredCompilation",
"-XX:ReservedCodeCacheSize=240m",
"-XX:+PrintCodeCache",
"-version");
verifySegmentedCodeCache(pb, true);
pb = ProcessTools.createLimitedTestJavaProcessBuilder("-XX:+TieredCompilation",
"-XX:ReservedCodeCacheSize=400m",
"-XX:+PrintCodeCache",
"-version");
verifySegmentedCodeCache(pb, true);
// Always enabled if SegmentedCodeCache is set
pb = ProcessTools.createLimitedTestJavaProcessBuilder("-XX:+SegmentedCodeCache",
"-XX:-TieredCompilation",
"-XX:ReservedCodeCacheSize=239m",
"-XX:+PrintCodeCache",
"-version");
verifySegmentedCodeCache(pb, true);
// The profiled and non-profiled code heaps should not be available in
// interpreter-only mode
pb = ProcessTools.createLimitedTestJavaProcessBuilder("-XX:+SegmentedCodeCache",
"-Xint",
"-XX:+PrintCodeCache",
"-version");
verifyCodeHeapNotExists(pb, PROFILED, NON_PROFILED);
// If we stop compilation at CompLevel_none or CompLevel_simple we
// don't need a profiled code heap.
pb = ProcessTools.createLimitedTestJavaProcessBuilder("-XX:+SegmentedCodeCache",
"-XX:TieredStopAtLevel=0",
"-XX:+PrintCodeCache",
"-version");
verifyCodeHeapNotExists(pb, PROFILED);
pb = ProcessTools.createLimitedTestJavaProcessBuilder("-XX:+SegmentedCodeCache",
"-XX:TieredStopAtLevel=1",
"-XX:+PrintCodeCache",
"-version");
verifyCodeHeapNotExists(pb, PROFILED);
// Fails with too small non-nmethod code heap size
pb = ProcessTools.createLimitedTestJavaProcessBuilder("-XX:NonNMethodCodeHeapSize=100K",
"-version");
failsWith(pb, "Invalid NonNMethodCodeHeapSize");
// Fails if code heap sizes do not add up
pb = ProcessTools.createLimitedTestJavaProcessBuilder("-XX:+SegmentedCodeCache",
"-XX:ReservedCodeCacheSize=10M",
// After fixing a round_down issue with large page sizes (JDK-8334564),
// 5M is a bit too small for NonNMethodCodeHeap
"-XX:NonNMethodCodeHeapSize=6M",
"-XX:ProfiledCodeHeapSize=5M",
"-XX:NonProfiledCodeHeapSize=5M",
"-version");
failsWith(pb, "Invalid code heap sizes");
// Fails if not enough space for VM internal code
long minUseSpace = WHITE_BOX.getUintxVMFlag("CodeCacheMinimumUseSpace");
// minimum size: CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)
long minSize = (Platform.isDebugBuild() ? 3 : 1) * minUseSpace;
pb = ProcessTools.createLimitedTestJavaProcessBuilder("-XX:+SegmentedCodeCache",
"-XX:NonNMethodCodeHeapSize=" + minSize,
"-XX:ReservedCodeCacheSize=" + minSize,
"-XX:InitialCodeCacheSize=100K",
"-version");
failsWith(pb, "Not enough space in non-nmethod code heap to run VM");
// Try different combination of Segment Sizes
// Fails if there is not enough space for code cache.
// All segments are set to minimum allowed value, but VM still fails
pb = ProcessTools.createLimitedTestJavaProcessBuilder("-XX:+SegmentedCodeCache",
"-XX:ReservedCodeCacheSize=" + minSize,
"-XX:InitialCodeCacheSize=100K",
"-version");
failsWith(pb, "Invalid code heap sizes");
// Reserved code cache is set but not equal to the sum of other segments
// that are explicitly specified - fails
pb = ProcessTools.createLimitedTestJavaProcessBuilder("-XX:+SegmentedCodeCache",
"-XX:ReservedCodeCacheSize=100M",
"-XX:NonNMethodCodeHeapSize=10M",
"-XX:ProfiledCodeHeapSize=10M",
"-XX:NonProfiledCodeHeapSize=10M",
"-version");
failsWith(pb, "Invalid code heap sizes");
// Reserved code cache is not set - it's automatically adjusted to the sum of other segments
// that are explicitly specified
pb = ProcessTools.createLimitedTestJavaProcessBuilder("-XX:+SegmentedCodeCache",
"-XX:NonNMethodCodeHeapSize=10M",
"-XX:ProfiledCodeHeapSize=10M",
"-XX:NonProfiledCodeHeapSize=10M",
"-XX:+PrintFlagsFinal",
"-version");
verifyCodeHeapSize(pb, "ReservedCodeCacheSize", 31457280);
// Reserved code cache is set, NonNmethod segment size is set, two other segments is automatically
// adjusted to half of the remaining space
pb = ProcessTools.createLimitedTestJavaProcessBuilder("-XX:+SegmentedCodeCache",
"-XX:ReservedCodeCacheSize=100M",
"-XX:NonNMethodCodeHeapSize=10M",
"-XX:+PrintFlagsFinal",
"-version");
verifyCodeHeapSize(pb, " ProfiledCodeHeapSize", 47185920);
// Reserved code cache is set but NonNmethodCodeHeapSize is not set.
// It's calculated based on the number of compiler threads
pb = ProcessTools.createLimitedTestJavaProcessBuilder("-XX:+SegmentedCodeCache",
"-XX:ReservedCodeCacheSize=100M",
"-XX:ProfiledCodeHeapSize=10M",
"-XX:NonProfiledCodeHeapSize=10M",
"-XX:+PrintFlagsFinal",
"-version");
verifyCodeHeapSize(pb, "NonNMethodCodeHeapSize", 83886080);
}
}
|
