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 TestLogging
26 * @summary Check that a mixed GC is reflected in the gc logs
27 * @requires vm.gc=="G1" | vm.gc=="null"
28 * @library /testlibrary /test/lib
29 * @modules java.management
30 * @build sun.hotspot.WhiteBox gc.g1.mixedgc.TestLogging
31 * @run main ClassFileInstaller sun.hotspot.WhiteBox
32 * @run driver gc.g1.mixedgc.TestLogging
33 */
34
35 package gc.g1.mixedgc;
36
37 import jdk.test.lib.OutputAnalyzer;
38 import jdk.test.lib.ProcessTools;
39 import jdk.test.lib.Asserts;
40 import sun.hotspot.WhiteBox;
41
42 import java.util.ArrayList;
43 import java.util.List;
44 import java.util.Collections;
45
46 /**
47 * Test spawns MixedGCProvoker in a separate VM and expects to find a message
48 * telling that a mixed gc has happened
49 */
50 public class TestLogging {
51 private static final String[] COMMON_OPTIONS = new String[]{
52 "-Xbootclasspath/a:.", "-XX:+UseG1GC",
53 "-XX:+UnlockExperimentalVMOptions",
54 "-XX:+UnlockDiagnosticVMOptions",
55 "-XX:+WhiteBoxAPI",
56 "-XX:SurvivorRatio=1", // Survivor-to-eden ratio is 1:1
57 "-Xms10M", "-Xmx10M",
58 "-XX:MaxTenuringThreshold=1", // promote objects after first gc
59 "-XX:InitiatingHeapOccupancyPercent=0", // marking cycle happens
60 // each time
61 "-XX:G1MixedGCCountTarget=4",
62 "-XX:MaxGCPauseMillis=30000", // to have enough time
63 "-XX:G1HeapRegionSize=1m", "-XX:G1HeapWastePercent=0",
64 "-XX:G1MixedGCLiveThresholdPercent=100"};
65
66 public static final int ALLOCATION_SIZE = 20000;
67 public static final int ALLOCATION_COUNT = 15;
68
69 public static void main(String args[]) throws Exception {
70 // Test turns logging on by giving -Xlog:gc flag
71 test("-Xlog:gc");
72 // Test turns logging on by giving -Xlog:gc=debug flag
73 test("-Xlog:gc=debug");
74 }
75
76 private static void test(String vmFlag) throws Exception {
77 System.out.println(String.format("%s: running with %s flag", TestLogging.class.getSimpleName(), vmFlag));
78 OutputAnalyzer output = spawnMixedGCProvoker(vmFlag);
79 System.out.println(output.getStdout());
80 output.shouldHaveExitValue(0);
81 output.shouldContain("Pause Mixed (G1 Evacuation Pause)");
82 }
83
84 /**
85 * Method spawns MixedGCProvoker with addition flags set
86 *
87 * @parameter extraFlags -flags to be added to the common options set
88 */
89 private static OutputAnalyzer spawnMixedGCProvoker(String... extraFlags)
90 throws Exception {
91 List<String> testOpts = new ArrayList<>();
92 Collections.addAll(testOpts, COMMON_OPTIONS);
93 Collections.addAll(testOpts, extraFlags);
94 testOpts.add(MixedGCProvoker.class.getName());
95 System.out.println(testOpts);
96 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(false,
97 testOpts.toArray(new String[testOpts.size()]));
98 return new OutputAnalyzer(pb.start());
99 }
100 }
101
102 /**
103 * Utility class to guarantee a mixed GC. The class allocates several arrays and
104 * promotes them to the oldgen. After that it tries to provoke mixed GC by
105 * allocating new objects.
106 *
107 * The necessary condition for guaranteed mixed GC is running MixedGCProvoker is
108 * running in VM with the following flags: -XX:MaxTenuringThreshold=1, -Xms10M,
109 * -Xmx10M, -XX:G1MixedGCLiveThresholdPercent=100, -XX:G1HeapWastePercent=0,
110 * -XX:G1HeapRegionSize=1m
111 */
112 class MixedGCProvoker {
113 private static final WhiteBox WB = WhiteBox.getWhiteBox();
114 private static final List<byte[]> liveOldObjects = new ArrayList<>();
115 private static final List<byte[]> newObjects = new ArrayList<>();
116
117 private static void allocateOldObjects() throws Exception {
118 List<byte[]> deadOldObjects = new ArrayList<>();
119 // Allocates buffer and promotes it to the old gen. Mix live and dead old
120 // objects
121 for (int i = 0; i < TestLogging.ALLOCATION_COUNT; ++i) {
122 liveOldObjects.add(new byte[TestLogging.ALLOCATION_SIZE * 10]);
123 deadOldObjects.add(new byte[TestLogging.ALLOCATION_SIZE * 10]);
124 }
125
126 // need only 2 promotions to promote objects to the old gen
127 WB.youngGC();
128 WB.youngGC();
129 // check it is promoted & keep alive
130 Asserts.assertTrue(WB.isObjectInOldGen(liveOldObjects),
131 "List of the objects is suppose to be in OldGen");
132 Asserts.assertTrue(WB.isObjectInOldGen(deadOldObjects),
133 "List of the objects is suppose to be in OldGen");
134 }
135
136
137 /**
138 * Waits until Concurent Mark Cycle finishes
139 * @param wb Whitebox instance
140 * @param sleepTime sleep time
141 */
142 public static void waitTillCMCFinished(WhiteBox wb, int sleepTime) {
143 while (wb.g1InConcurrentMark()) {
144 if (sleepTime > -1) {
145 try {
146 Thread.sleep(sleepTime);
147 } catch (InterruptedException e) {
148 System.out.println("Got InterruptedException while waiting for ConcMarkCycle to finish");
149 }
150 }
151 }
152 }
153
154
155
156 public static void main(String args[]) throws Exception {
157 // allocate old objects
158 allocateOldObjects();
159 waitTillCMCFinished(WB, 0);
160 WB.g1StartConcMarkCycle();
161 waitTillCMCFinished(WB, 0);
162
163 WB.youngGC();
164 System.out.println("Allocating new objects to provoke mixed GC");
165 // allocate more objects to provoke GC
166 for (int i = 0; i < (TestLogging.ALLOCATION_COUNT * 20); i++) {
167 newObjects.add(new byte[TestLogging.ALLOCATION_SIZE]);
168 }
169 // check that liveOldObjects still alive
170 Asserts.assertTrue(WB.isObjectInOldGen(liveOldObjects),
171 "List of the objects is suppose to be in OldGen");
172 }
173 }