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8271834: TestStringDeduplicationAgeThreshold intermittent failures on Shenandoah

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Reviewed-by: shade, pliden
This commit is contained in:
Zhengyu Gu 2021-09-13 12:23:12 +00:00
parent 261cb44b13
commit f9b2507f3e
1 changed files with 47 additions and 6 deletions
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53
test/hotspot/jtreg/gc/stringdedup/TestStringDeduplicationTools.java
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@ -27,8 +27,12 @@ package gc.stringdedup;
* Common code for string deduplication tests
*/
import com.sun.management.GarbageCollectionNotificationInfo;
import java.lang.reflect.*;
import java.lang.management.*;
import java.util.*;
import javax.management.*;
import javax.management.openmbean.*;
import jdk.test.lib.process.ProcessTools;
import jdk.test.lib.process.OutputAnalyzer;
import sun.misc.*;
@ -89,21 +93,58 @@ class TestStringDeduplicationTools {
}
}
private static volatile int gcCount;
private static NotificationListener listener = new NotificationListener() {
@Override
public void handleNotification(Notification n, Object o) {
if (n.getType().equals(GarbageCollectionNotificationInfo.GARBAGE_COLLECTION_NOTIFICATION)) {
GarbageCollectionNotificationInfo info = GarbageCollectionNotificationInfo.from((CompositeData) n.getUserData());
// Shenandoah and Z GC also report GC pauses, skip them
if (info.getGcName().startsWith("Shenandoah") || info.getGcName().startsWith("ZGC")) {
if ("end of GC cycle".equals(info.getGcAction())) {
gcCount++;
}
} else {
gcCount++;
}
}
}
};
private static void registerGCListener() {
for (GarbageCollectorMXBean bean : ManagementFactory.getGarbageCollectorMXBeans()) {
((NotificationEmitter)bean).addNotificationListener(listener, null, null);
}
}
private static void unregisterGCListener() {
for (GarbageCollectorMXBean bean : ManagementFactory.getGarbageCollectorMXBeans()) {
try {
((NotificationEmitter) bean).removeNotificationListener(listener, null, null);
} catch (Exception e) {
}
}
}
private static void doYoungGc(int numberOfTimes) {
// Provoke at least numberOfTimes young GCs
final int objectSize = 128;
final int maxObjectInYoung = (Xmn * MB) / objectSize;
List<List<String>> newStrings = new ArrayList<List<String>>();
for (int i = 0; i < numberOfTimes; i++) {
// Provoke at least numberOfTimes young GCs
gcCount = 0;
registerGCListener();
while (gcCount < numberOfTimes) {
int currentCount = gcCount;
// Create some more strings for every collection, to ensure
// there will be deduplication work that will be reported.
newStrings.add(createStrings(SmallNumberOfStrings, SmallNumberOfStrings));
System.out.println("Begin: Young GC " + (i + 1) + "/" + numberOfTimes);
for (int j = 0; j < maxObjectInYoung + 1; j++) {
System.out.println("Begin: Young GC " + (currentCount + 1) + "/" + numberOfTimes);
while (currentCount == gcCount) {
dummy = new byte[objectSize];
}
System.out.println("End: Young GC " + (i + 1) + "/" + numberOfTimes);
System.out.println("End: Young GC " + (currentCount + 1) + "/" + numberOfTimes);
}
unregisterGCListener();
}
private static void forceDeduplication(int ageThreshold, String gcType) {