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* Copyright ( c ) 2018 , Oracle and / or its affiliates . All rights reserved .
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER .
*
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* under the terms of the GNU General Public License version 2 only , as
* published by the Free Software Foundation .
*
* This code is distributed in the hope that it will be useful , but WITHOUT
* ANY WARRANTY ; without even the implied warranty of MERCHANTABILITY or
* 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 ) .
*
* You should have received a copy of the GNU General Public License version
* 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.event.oldobject;
import java.util.ArrayList;
import java.util.List;
import jdk.jfr.Recording;
import jdk.jfr.consumer.RecordedEvent;
import jdk.jfr.internal.test.WhiteBox;
import jdk.test.lib.jfr.EventNames;
import jdk.test.lib.jfr.Events;
/**
* @ test
* @ key jfr
* @ requires vm . hasJFR
* @ requires vm . gc . G1
* @ summary Test leak profiler with G1 GC
* @ library / test / lib / test / jdk
* @ modules jdk . jfr / jdk . jfr . internal . test
* @ run main / othervm - XX : TLABSize = 2 k - XX : + UseG1GC jdk . jfr . event . oldobject . TestG1
*/
public class TestG1 {
static private class FindMe {
}
public static List<FindMe[]> list = new ArrayList<>(OldObjects.MIN_SIZE);
public static void main(String[] args) throws Exception {
WhiteBox.setWriteAllObjectSamples(true );
while (true ) {
try (Recording r = new Recording()) {
r.enable(EventNames.OldObjectSample).withStackTrace().with("cutoff" , "infinity" );
r.start();
allocateFindMe();
System.gc();
r.stop();
List<RecordedEvent> events = Events.fromRecording(r);
System.out.println(events);
if (OldObjects.countMatchingEvents(events, FindMe[].class , null , null , -1 , "allocateFindMe" ) > 0 ) {
return ;
}
System.out.println("Could not find leaking object, retrying..." );
}
list.clear();
}
}
public static void allocateFindMe() {
for (int i = 0 ; i < OldObjects.MIN_SIZE; i++) {
// Allocate array to trigger sampling code path for interpreter / c1
list.add(new FindMe[0 ]);
}
}
}
Messung V0.5 in Prozent C=96 H=93 G=94
¤ Dauer der Verarbeitung: 0.12 Sekunden
(vorverarbeitet am 2026-06-10)
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