1 /*
2 * Copyright (c) 2018, Red Hat, Inc. All rights reserved.
3 * Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 /*
27 * @test id=passive
28 * @summary Check that MX notifications are reported for all cycles
29 * @library /test/lib /
30 * @requires vm.gc.Shenandoah
31 *
32 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
33 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
34 * -XX:+ShenandoahDegeneratedGC -Dprecise=true
35 * TestChurnNotifications
36 *
37 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
38 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
39 * -XX:-ShenandoahDegeneratedGC -Dprecise=true
40 * TestChurnNotifications
41 */
42
43 /*
44 * @test id=aggressive
45 * @summary Check that MX notifications are reported for all cycles
46 * @library /test/lib /
47 * @requires vm.gc.Shenandoah
48 *
49 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
50 * -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive
51 * -Dprecise=false
52 * TestChurnNotifications
53 */
54
55 /*
56 * @test id=adaptive
57 * @summary Check that MX notifications are reported for all cycles
58 * @library /test/lib /
59 * @requires vm.gc.Shenandoah
60 *
61 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
62 * -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive
63 * -Dprecise=false
64 * TestChurnNotifications
65 */
66
67 /*
68 * @test id=static
69 * @summary Check that MX notifications are reported for all cycles
70 * @library /test/lib /
71 * @requires vm.gc.Shenandoah
72 *
73 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
74 * -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=static
75 * -Dprecise=false
76 * TestChurnNotifications
77 */
78
79 /*
80 * @test id=compact
81 * @summary Check that MX notifications are reported for all cycles
82 * @library /test/lib /
83 * @requires vm.gc.Shenandoah
84 *
85 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
86 * -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=compact
87 * -Dprecise=false
88 * TestChurnNotifications
89 */
90
91 /*
92 * @test id=iu
93 * @summary Check that MX notifications are reported for all cycles
94 * @library /test/lib /
95 * @requires vm.gc.Shenandoah
96 *
97 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
98 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu -XX:ShenandoahGCHeuristics=aggressive
99 * -Dprecise=false
100 * TestChurnNotifications
101 *
102 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
103 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu
104 * -Dprecise=false
105 * TestChurnNotifications
106 */
107
108 /*
109 * @test id=generational
110 * @summary Check that MX notifications are reported for all cycles
111 * @library /test/lib /
112 * @requires vm.gc.Shenandoah
113 *
114 * @run main/othervm -Xmx128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
115 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=generational
116 * -Dprecise=false
117 * TestChurnNotifications
118 */
119
120 import java.util.*;
121 import java.util.concurrent.atomic.*;
122 import javax.management.*;
123 import java.lang.management.*;
124 import javax.management.openmbean.*;
125
126 import jdk.test.lib.Utils;
127
128 import com.sun.management.GarbageCollectionNotificationInfo;
129
130 public class TestChurnNotifications {
131
132 static final long HEAP_MB = 128; // adjust for test configuration above
133 static final long TARGET_MB = Long.getLong("target", 2_000); // 2 Gb allocation
134
135 // Should we track the churn precisely?
136 // Precise tracking is only reliable when GC is fully stop-the-world. Otherwise,
137 // we cannot tell, looking at heap used before/after, what was the GC churn.
138 static final boolean PRECISE = Boolean.getBoolean("precise");
139
140 static final long M = 1024 * 1024;
141
142 static volatile Object sink;
143
144 private static final String DEFAULT_POOL_NAME = "Shenandoah";
145 private static final String YOUNG_GEN_POOL_NAME = "Shenandoah Young Gen";
146
147 private static MemoryUsage getUsage(Map<String, MemoryUsage> pools) {
148 MemoryUsage usage = pools.get(DEFAULT_POOL_NAME);
149 if (usage == null) {
150 usage = pools.get(YOUNG_GEN_POOL_NAME);
151 }
152 return usage;
153 }
154
155 public static void main(String[] args) throws Exception {
156 final long startTime = System.currentTimeMillis();
157
158 final AtomicLong churnBytes = new AtomicLong();
159
160 NotificationListener listener = new NotificationListener() {
161 @Override
162 public void handleNotification(Notification n, Object o) {
163 if (n.getType().equals(GarbageCollectionNotificationInfo.GARBAGE_COLLECTION_NOTIFICATION)) {
164 GarbageCollectionNotificationInfo info = GarbageCollectionNotificationInfo.from((CompositeData) n.getUserData());
165 Map<String, MemoryUsage> mapBefore = info.getGcInfo().getMemoryUsageBeforeGc();
166 Map<String, MemoryUsage> mapAfter = info.getGcInfo().getMemoryUsageAfterGc();
167
168 MemoryUsage before = getUsage(mapBefore);
169 MemoryUsage after = getUsage(mapAfter);
170
171 if ((before != null) && (after != null)) {
172 long diff = before.getUsed() - after.getUsed();
173 if (diff > 0) {
174 churnBytes.addAndGet(diff);
175 }
176 }
177 }
178 }
179 };
180
181 for (GarbageCollectorMXBean bean : ManagementFactory.getGarbageCollectorMXBeans()) {
182 ((NotificationEmitter) bean).addNotificationListener(listener, null, null);
183 }
184
185 final int size = 100_000;
186 long count = TARGET_MB * 1024 * 1024 / (16 + 4 * size);
187
188 long mem = count * (16 + 4 * size);
189
190 for (int c = 0; c < count; c++) {
191 sink = new int[size];
192 }
193
194 System.gc();
195
196 long minExpected = PRECISE ? (mem - HEAP_MB * 1024 * 1024) : 1;
197 long maxExpected = mem + HEAP_MB * 1024 * 1024;
198 long actual = 0;
199
200 // Look at test timeout to figure out how long we can wait without breaking into timeout.
201 // Default to 1/4 of the remaining time in 1s steps.
202 final long STEP_MS = 1000;
203 long spentTime = System.currentTimeMillis() - startTime;
204 long maxTries = (Utils.adjustTimeout(Utils.DEFAULT_TEST_TIMEOUT) - spentTime) / STEP_MS / 4;
205
206 // Wait until enough notifications are accrued to match minimum boundary.
207 long tries = 0;
208 while (tries++ < maxTries) {
209 actual = churnBytes.get();
210 if (minExpected <= actual) {
211 // Wait some more to test if we are breaking the maximum boundary.
212 Thread.sleep(5000);
213 actual = churnBytes.get();
214 break;
215 }
216 Thread.sleep(STEP_MS);
217 }
218
219 String msg = "Expected = [" + minExpected / M + "; " + maxExpected / M + "] (" + mem / M + "), actual = " + actual / M;
220 if (minExpected <= actual && actual <= maxExpected) {
221 System.out.println(msg);
222 } else {
223 throw new IllegalStateException(msg);
224 }
225 }
226 }