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* 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 ) .
*
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* 2 along with this work ; if not , write to the Free Software Foundation ,
* Inc . , 51 Franklin St , Fifth Floor , Boston , MA 02110 - 1301 USA .
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package jdk.jfr.jcmd;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import jdk.jfr.Enabled;
import jdk.jfr.Recording;
import jdk.jfr.consumer.RecordedEvent;
import jdk.jfr.consumer.RecordedObject;
import jdk.jfr.consumer.RecordingFile;
import jdk.jfr.internal.test.WhiteBox;
import jdk.test.lib.jfr.EventNames;
/**
* @ test
* @ summary Start a recording with or without path - to - gc - roots
* @ requires vm . hasJFR
* @ modules jdk . jfr / jdk . jfr . internal . test
* @ library / test / lib / test / jdk
* @ key jfr
*
* @ run main / othervm - XX : TLABSize = 2 k jdk . jfr . jcmd . TestJcmdDumpPathToGCRoots
*/
public class TestJcmdDumpPathToGCRoots {
private static final int OBJECT_COUNT = 100 _000 ;
public static List<Object[]> leak = new ArrayList<>(OBJECT_COUNT);
public static void main(String[] args) throws Exception {
WhiteBox.setWriteAllObjectSamples(true );
String settingName = EventNames.OldObjectSample + "#" + "cutoff" ;
// dump parameter trumps previous setting
testDump("path-to-gc-roots=true" , Collections.singletonMap(settingName, "infinity" ), true );
testDump("path-to-gc-roots=true" , Collections.singletonMap(settingName, "0 ns" ), true );
testDump("path-to-gc-roots=true" , Collections.emptyMap(), true );
testDump("path-to-gc-roots=false" , Collections.singletonMap(settingName, "infinity" ), false );
testDump("path-to-gc-roots=false" , Collections.singletonMap(settingName, "0 ns" ), false );
testDump("path-to-gc-roots=false" , Collections.emptyMap(), false );
testDump("" , Collections.singletonMap(settingName, "infinity" ), true );
testDump("" , Collections.singletonMap(settingName, "0 ns" ), false );
testDump("" , Collections.emptyMap(), false );
}
private static void testDump(String pathToGcRoots, Map<String, String> settings, boolean expectedChains) throws Exception {
try (Recording r = new Recording()) {
Map<String, String> p = new HashMap<>(settings);
p.put(EventNames.OldObjectSample + "#" + Enabled.NAME, "true" );
r.setName("dodo" );
r.setSettings(p);
r.setToDisk(true );
r.start();
clearLeak();
System.out.println("Recording id: " + r.getId());
System.out.println("Settings: " + settings.toString());
System.out.println("Command: JFR.dump " + pathToGcRoots);
System.out.println("Chains expected: " + expectedChains);
buildLeak();
System.gc();
System.gc();
File recording = new File("TestJcmdDumpPathToGCRoots" + r.getId() + ".jfr" );
recording.delete ();
JcmdHelper.jcmd("JFR.dump" , "name=dodo" , pathToGcRoots, "filename=" + recording.getAbsolutePath());
r.setSettings(Collections.emptyMap());
List<RecordedEvent> events = RecordingFile.readAllEvents(recording.toPath());
if (events.isEmpty()) {
throw new Exception("No events found in recoding" );
}
boolean chains = hasChains(events);
if (expectedChains && !chains) {
System.out.println(events);
throw new Exception("Expected chains but found none" );
}
if (!expectedChains && chains) {
System.out.println(events);
throw new Exception("Didn't expect chains but found some" );
}
}
}
private static void clearLeak() {
leak.clear();
}
private static boolean hasChains(List<RecordedEvent> events) throws IOException {
for (RecordedEvent e : events) {
RecordedObject ro = e.getValue("object" );
if (ro.getValue("referrer" ) != null ) {
return true ;
}
}
return false ;
}
private static void buildLeak() {
for (int i = 0 ; i < OBJECT_COUNT;i ++) {
leak.add(new Object[0 ]);
}
}
}
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