1 /*
2 * Copyright (c) 2018, 2019, 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 package gc.g1.mixedgc;
25
26 import static sun.hotspot.WhiteBox.getWhiteBox;
27
28 import java.lang.management.*;
29 import java.util.ArrayList;
30 import java.util.List;
31
32 import gc.testlibrary.g1.MixedGCProvoker;
33
34 /*
35 * @test TestOldGenCollectionUsage.java
36 * @bug 8195115
37 * @summary G1 Old Gen's CollectionUsage.used is zero after mixed GC which is incorrect
38 * @key gc
39 * @requires vm.gc.G1
40 * @library /test/lib /
41 * @modules java.base/jdk.internal.misc
42 * @modules java.management
43 * @build sun.hotspot.WhiteBox
44 * @run driver ClassFileInstaller sun.hotspot.WhiteBox
45 * @run main/othervm -Xbootclasspath/a:. -XX:+UseG1GC -XX:+UnlockExperimentalVMOptions -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -verbose:gc -XX:NewSize=2m -XX:MaxNewSize=2m -Xmx14m -Xms14m -XX:+AlwaysTenure -XX:InitiatingHeapOccupancyPercent=100 -XX:-G1UseAdaptiveIHOP -XX:G1MixedGCCountTarget=4 -XX:MaxGCPauseMillis=30000 -XX:G1HeapRegionSize=1m -XX:G1HeapWastePercent=0 -XX:G1MixedGCLiveThresholdPercent=100 gc.g1.mixedgc.TestOldGenCollectionUsage
46 */
47
48 // 8195115 says that for the "G1 Old Gen" MemoryPool, CollectionUsage.used
49 // is zero for G1 after a mixed collection, which is incorrect. We can not guarantee
50 // that we start with an old gen occupancy of zero though due to allocation during
51 // initialization. We check for "increases during mixed gc" instead.
52
53 public class TestOldGenCollectionUsage {
54
55 private static final int HeapRegionSize = 1024 * 1024;
56 private static final int ObjectSize = 20_000;
57
58 private String poolName = "G1 Old Gen";
59 private String collectorName = "G1 Young Generation";
60
61 public static void main(String [] args) throws Exception {
62 TestOldGenCollectionUsage t = new TestOldGenCollectionUsage();
63 t.run();
64 }
65
66 public TestOldGenCollectionUsage() {
67 System.out.println("Monitor G1 Old Gen pool with G1 Young Generation collector.");
68 }
69
70 public void run() {
71 // Find memory pool and collector
72 List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();
73 MemoryPoolMXBean pool = null;
74 boolean foundPool = false;
75 for (int i = 0; i < pools.size(); i++) {
76 pool = pools.get(i);
77 String name = pool.getName();
78 if (name.contains(poolName)) {
79 System.out.println("Found pool: " + name);
80 foundPool = true;
81 break;
82 }
83 }
84 if (!foundPool) {
85 throw new RuntimeException(poolName + " not found, test with -XX:+UseG1GC");
86 }
87
88 List<GarbageCollectorMXBean> collectors = ManagementFactory.getGarbageCollectorMXBeans();
89 GarbageCollectorMXBean collector = null;
90 boolean foundCollector = false;
91 for (int i = 0; i < collectors.size(); i++) {
92 collector = collectors.get(i);
93 String name = collector.getName();
94 if (name.contains(collectorName)) {
95 System.out.println("Found collector: " + name);
96 foundCollector = true;
97 break;
98 }
99 }
100 if (!foundCollector) {
101 throw new RuntimeException(collectorName + " not found, test with -XX:+UseG1GC");
102 }
103
104 getWhiteBox().fullGC(); // Make sure the heap is in a known state.
105
106 var liveOldObjects = new ArrayList<byte[]>();
107 MixedGCProvoker.allocateOldObjects(liveOldObjects, HeapRegionSize, ObjectSize);
108
109 long baseUsage = pool.getCollectionUsage().getUsed();
110 System.out.println(poolName + ": usage after GC = " + baseUsage);
111
112 // Verify that collections were done
113 long collectionCount = collector.getCollectionCount();
114 System.out.println(collectorName + ": collection count = "
115 + collectionCount);
116 long collectionTime = collector.getCollectionTime();
117 System.out.println(collectorName + ": collection time = "
118 + collectionTime);
119 if (collectionCount <= 0) {
120 throw new RuntimeException("Collection count <= 0");
121 }
122 if (collectionTime <= 0) {
123 throw new RuntimeException("Collector has not run");
124 }
125
126 MixedGCProvoker.provokeMixedGC(liveOldObjects);
127
128 long usage = pool.getCollectionUsage().getUsed();
129 System.out.println(poolName + ": usage after GC = " + usage);
130 if (usage <= baseUsage) {
131 throw new RuntimeException(poolName + " found not updating usage");
132 }
133
134 long newCollectionCount = collector.getCollectionCount();
135 System.out.println(collectorName + ": collection count = "
136 + newCollectionCount);
137 long newCollectionTime = collector.getCollectionTime();
138 System.out.println(collectorName + ": collection time = "
139 + newCollectionTime);
140 if (newCollectionCount <= collectionCount) {
141 throw new RuntimeException("No new collection");
142 }
143 if (newCollectionTime <= collectionTime) {
144 throw new RuntimeException("Collector has not run some more");
145 }
146
147 System.out.println("Test passed.");
148 }
149 }
150