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25 
26 package jdk.jfr.jcmd;
27 
28 import java.io.File;
29 import java.io.IOException;
30 import java.util.ArrayList;
31 import java.util.Collections;
32 import java.util.HashMap;
33 import java.util.List;
34 import java.util.Map;
35 
36 import jdk.jfr.Enabled;
37 import jdk.jfr.Recording;
38 import jdk.jfr.consumer.RecordedEvent;
39 import jdk.jfr.consumer.RecordedObject;
40 import jdk.jfr.consumer.RecordingFile;
41 import jdk.jfr.internal.test.WhiteBox;
42 import jdk.test.lib.jfr.EventNames;
43 
44 /**
45  * @test
46  * @summary Start a recording with or without path-to-gc-roots
47  *
48  *
49  * @library /lib /
50  * @key jfr
51  *
52  * @run main/othervm -XX:TLABSize=2k jdk.jfr.jcmd.TestJcmdDumpPathToGCRoots
53  */
54 public class TestJcmdDumpPathToGCRoots {
55 
56     private static final int OBJECT_COUNT = 100_000;
57     public static List<Object[]> leak = new ArrayList<>(OBJECT_COUNT);
58 
main(String[] args)59     public static void main(String[] args) throws Exception {
60         WhiteBox.setWriteAllObjectSamples(true);
61 
62         String settingName = EventNames.OldObjectSample + "#" + "cutoff";
63 
64         // dump parameter trumps previous setting
65         testDump("path-to-gc-roots=true", Collections.singletonMap(settingName, "infinity"), true);
66         testDump("path-to-gc-roots=true", Collections.singletonMap(settingName, "0 ns"), true);
67         testDump("path-to-gc-roots=true", Collections.emptyMap(), true);
68 
69         testDump("path-to-gc-roots=false", Collections.singletonMap(settingName, "infinity"), false);
70         testDump("path-to-gc-roots=false", Collections.singletonMap(settingName, "0 ns"), false);
71         testDump("path-to-gc-roots=false", Collections.emptyMap(), false);
72 
73         testDump("", Collections.singletonMap(settingName, "infinity"), true);
74         testDump("", Collections.singletonMap(settingName, "0 ns"), false);
75         testDump("", Collections.emptyMap(), false);
76     }
77 
testDump(String pathToGcRoots, Map<String, String> settings, boolean expectedChains)78     private static void testDump(String pathToGcRoots, Map<String, String> settings, boolean expectedChains) throws Exception {
79         try (Recording r = new Recording()) {
80             Map<String, String> p = new HashMap<>(settings);
81             p.put(EventNames.OldObjectSample + "#" + Enabled.NAME, "true");
82             r.setName("dodo");
83             r.setSettings(p);
84             r.setToDisk(true);
85             r.start();
86             clearLeak();
87             System.out.println("Recording id: " + r.getId());
88             System.out.println("Settings: " + settings.toString());
89             System.out.println("Command: JFR.dump " + pathToGcRoots);
90             System.out.println("Chains expected: " + expectedChains);
91             buildLeak();
92             System.gc();
93             System.gc();
94             File recording = new File("TestJcmdDumpPathToGCRoots" + r.getId() + ".jfr");
95             recording.delete();
96             JcmdHelper.jcmd("JFR.dump", "name=dodo", pathToGcRoots, "filename=" + recording.getAbsolutePath());
97             r.setSettings(Collections.emptyMap());
98             List<RecordedEvent> events = RecordingFile.readAllEvents(recording.toPath());
99             if (events.isEmpty()) {
100                 throw new Exception("No events found in recoding");
101             }
102             boolean chains = hasChains(events);
103             if (expectedChains && !chains) {
104                 System.out.println(events);
105                 throw new Exception("Expected chains but found none");
106             }
107             if (!expectedChains && chains) {
108                 System.out.println(events);
109                 throw new Exception("Didn't expect chains but found some");
110             }
111         }
112     }
113 
clearLeak()114     private static void clearLeak() {
115       leak.clear();
116     }
117 
hasChains(List<RecordedEvent> events)118     private static boolean hasChains(List<RecordedEvent> events) throws IOException {
119         for (RecordedEvent e : events) {
120             RecordedObject ro = e.getValue("object");
121             if (ro.getValue("referrer") != null) {
122                 return true;
123             }
124         }
125         return false;
126     }
127 
buildLeak()128     private static void buildLeak() {
129         for (int i = 0; i < OBJECT_COUNT;i ++) {
130             leak.add(new Object[0]);
131         }
132     }
133 }
134