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8208250: Rewrite metaspace firstGC tests to use JFR instead of GC log parsing

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This commit is contained in:
Shiv Shah 2026-06-08 12:37:18 -05:00
parent e155a20b49
commit 239c9bbbed
10 changed files with 183 additions and 184 deletions
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5
test/hotspot/jtreg/ProblemList.txt
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@ -164,11 +164,6 @@ serviceability/jvmti/stress/StackTrace/NotSuspended/GetStackTraceNotSuspendedStr
vmTestbase/gc/gctests/FinalizeTest04/FinalizeTest04.java 8284234 generic-all
vmTestbase/gc/gctests/PhantomReference/phantom001/phantom001.java 8284234 generic-all
vmTestbase/metaspace/gc/firstGC_10m/TestDescription.java 8208250 generic-all
vmTestbase/metaspace/gc/firstGC_50m/TestDescription.java 8208250 generic-all
vmTestbase/metaspace/gc/firstGC_99m/TestDescription.java 8208250 generic-all
vmTestbase/metaspace/gc/firstGC_default/TestDescription.java 8208250 generic-all
vmTestbase/nsk/jvmti/scenarios/capability/CM03/cm03t001/TestDescription.java 8073470 linux-all
vmTestbase/nsk/jvmti/scenarios/events/EM02/em02t006/TestDescription.java 8372206 generic-all
vmTestbase/nsk/jvmti/InterruptThread/intrpthrd003/TestDescription.java 8288911 macosx-all

183
test/hotspot/jtreg/gc/metaspace/TestMetaspaceFirstGC.java Normal file
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@ -0,0 +1,183 @@
/*
* Copyright (c) 2026, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* 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.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test TestMetaspaceFirstGC
* @bug 8208250
* @summary Verify that the first metaspace GC happens near the MetaspaceSize threshold
* @requires vm.hasJFR
* @library /test/lib
* @run main/othervm -Xms200m -XX:-UseCompressedOops TestMetaspaceFirstGC
* @run main/othervm -Xms200m -XX:-UseCompressedOops -XX:MetaspaceSize=10m TestMetaspaceFirstGC 10m
* @run main/othervm -Xms200m -XX:-UseCompressedOops -XX:MetaspaceSize=50m TestMetaspaceFirstGC 50m
* @run main/othervm -Xms200m -XX:-UseCompressedOops -XX:MetaspaceSize=99m TestMetaspaceFirstGC 99m
*/
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.net.URL;
import java.net.URLClassLoader;
import java.time.Duration;
import java.util.List;
import jdk.jfr.Recording;
import jdk.jfr.consumer.RecordedEvent;
import jdk.test.lib.Asserts;
import jdk.test.lib.jfr.EventNames;
import jdk.test.lib.jfr.Events;
public class TestMetaspaceFirstGC {
private static int classCounter = 0;
public interface Dummy {}
static class DummyHandler implements InvocationHandler {
@Override
public Object invoke(Object proxy, Method method, Object[] args) {
return null;
}
}
public static void main(String[] args) throws Exception {
long expectedSize = -1;
if (args.length > 0) {
expectedSize = parseSize(args[0]);
}
try (Recording recording = new Recording()) {
recording.enable(EventNames.GarbageCollection);
recording.enable(EventNames.MetaspaceSummary).withThreshold(Duration.ofMillis(0));
recording.start();
// Load classes until a metaspace-triggered GC happens
loadClassesUntilGC(50000);
recording.stop();
List<RecordedEvent> events = Events.fromRecording(recording);
// Find first GarbageCollection with cause "Metadata GC Threshold"
RecordedEvent gcEvent = null;
for (RecordedEvent event : events) {
if (event.getEventType().getName().equals(EventNames.GarbageCollection)) {
String cause = event.getString("cause");
if ("Metadata GC Threshold".equals(cause)) {
gcEvent = event;
break;
}
}
}
if (gcEvent == null) {
throw new RuntimeException("No GC with cause 'Metadata GC Threshold' found");
}
int gcId = gcEvent.getInt("gcId");
System.out.println("Found Metadata GC Threshold GC, gcId=" + gcId);
// Find matching MetaspaceSummary with same gcId and when="Before GC"
RecordedEvent msEvent = null;
for (RecordedEvent event : events) {
if (event.getEventType().getName().equals(EventNames.MetaspaceSummary)) {
if (event.getInt("gcId") == gcId && "Before GC".equals(event.getString("when"))) {
msEvent = event;
break;
}
}
}
if (msEvent == null) {
throw new RuntimeException("No MetaspaceSummary 'Before GC' found for gcId=" + gcId);
}
long committed = msEvent.getLong("metaspace.committed");
long gcThreshold = msEvent.getLong("gcThreshold");
System.out.println("MetaspaceSummary: committed=" + committed + " gcThreshold=" + gcThreshold);
// committed should be reasonably close to gcThreshold
long tolerance = 5 * 1024 * 1024; // 5MB tolerance
Asserts.assertLessThanOrEqual(Math.abs(committed - gcThreshold), tolerance,
"committed (" + committed + ") should be close to gcThreshold (" + gcThreshold + ")");
// If explicit MetaspaceSize given, gcThreshold should match it
if (expectedSize > 0) {
Asserts.assertLessThanOrEqual(Math.abs(gcThreshold - expectedSize), tolerance,
"gcThreshold (" + gcThreshold + ") should be close to MetaspaceSize (" + expectedSize + ")");
System.out.println("gcThreshold matches expected MetaspaceSize=" + expectedSize);
}
System.out.println("PASSED");
}
}
private static void loadClassesUntilGC(int maxIterations) {
long prevUsed = getMetaspaceUsed();
for (int i = 0; i < maxIterations; i++) {
loadOneClass();
long used = getMetaspaceUsed();
if (used < prevUsed) {
System.out.println("GC detected at iteration " + i +
", used dropped from " + prevUsed + " to " + used);
return;
}
prevUsed = used;
}
throw new RuntimeException("No metaspace GC after " + maxIterations + " class loads");
}
private static void loadOneClass() {
try {
String jarUrl = "file:" + (classCounter++) + ".jar";
URLClassLoader cl = new URLClassLoader(new URL[]{new URL(jarUrl)});
Proxy.newProxyInstance(cl, new Class[]{Dummy.class}, new DummyHandler());
} catch (Exception e) {
throw new RuntimeException(e);
}
}
private static long getMetaspaceUsed() {
return java.lang.management.ManagementFactory.getMemoryPoolMXBeans().stream()
.filter(p -> p.getName().equals("Metaspace"))
.mapToLong(p -> p.getUsage().getUsed())
.findFirst()
.orElseThrow(() -> new RuntimeException("Metaspace pool not found"));
}
private static long parseSize(String size) {
size = size.toLowerCase();
long multiplier = 1;
if (size.endsWith("m")) {
multiplier = 1024 * 1024;
size = size.substring(0, size.length() - 1);
} else if (size.endsWith("k")) {
multiplier = 1024;
size = size.substring(0, size.length() - 1);
} else if (size.endsWith("g")) {
multiplier = 1024 * 1024 * 1024;
size = size.substring(0, size.length() - 1);
}
return Long.parseLong(size) * multiplier;
}
}

1
test/hotspot/jtreg/vmTestbase/metaspace/gc/firstGC_10m/TEST.properties
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44
test/hotspot/jtreg/vmTestbase/metaspace/gc/firstGC_10m/TestDescription.java
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@ -1,44 +0,0 @@
/*
* Copyright (c) 2017, 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* 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.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @modules java.base/jdk.internal.misc:+open
*
* @summary converted from VM Testbase metaspace/gc/firstGC_10m.
* VM Testbase keywords: [nonconcurrent, quarantine]
* VM Testbase comments: 8208250
*
* @library /vmTestbase /test/lib
* @run main/othervm
* -Xms200m
* -Xlog:gc+heap=trace,gc:gc.log
* -XX:MetaspaceSize=10m
* -XX:+IgnoreUnrecognizedVMOptions
* -XX:+UnlockDiagnosticVMOptions
* -XX:-VerifyBeforeExit
* -XX:-UseCompressedOops
* metaspace.gc.FirstGCTest
*/

1
test/hotspot/jtreg/vmTestbase/metaspace/gc/firstGC_50m/TEST.properties
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exclusiveAccess.dirs=.

44
test/hotspot/jtreg/vmTestbase/metaspace/gc/firstGC_50m/TestDescription.java
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@ -1,44 +0,0 @@
/*
* Copyright (c) 2017, 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* 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.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @modules java.base/jdk.internal.misc:+open
*
* @summary converted from VM Testbase metaspace/gc/firstGC_50m.
* VM Testbase keywords: [nonconcurrent, quarantine]
* VM Testbase comments: 8208250
*
* @library /vmTestbase /test/lib
* @run main/othervm
* -Xms200m
* -Xlog:gc+heap=trace,gc:gc.log
* -XX:MetaspaceSize=50m
* -XX:+IgnoreUnrecognizedVMOptions
* -XX:+UnlockDiagnosticVMOptions
* -XX:-VerifyBeforeExit
* -XX:-UseCompressedOops
* metaspace.gc.FirstGCTest
*/

1
test/hotspot/jtreg/vmTestbase/metaspace/gc/firstGC_99m/TEST.properties
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exclusiveAccess.dirs=.

44
test/hotspot/jtreg/vmTestbase/metaspace/gc/firstGC_99m/TestDescription.java
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@ -1,44 +0,0 @@
/*
* Copyright (c) 2017, 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* 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.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @modules java.base/jdk.internal.misc:+open
*
* @summary converted from VM Testbase metaspace/gc/firstGC_99m.
* VM Testbase keywords: [nonconcurrent, quarantine]
* VM Testbase comments: 8208250
*
* @library /vmTestbase /test/lib
* @run main/othervm
* -Xms200m
* -Xlog:gc+heap=trace,gc:gc.log
* -XX:MetaspaceSize=99m
* -XX:+IgnoreUnrecognizedVMOptions
* -XX:+UnlockDiagnosticVMOptions
* -XX:-VerifyBeforeExit
* -XX:-UseCompressedOops
* metaspace.gc.FirstGCTest
*/

1
test/hotspot/jtreg/vmTestbase/metaspace/gc/firstGC_default/TEST.properties
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@ -1 +0,0 @@
exclusiveAccess.dirs=.

43
test/hotspot/jtreg/vmTestbase/metaspace/gc/firstGC_default/TestDescription.java
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@ -1,43 +0,0 @@
/*
* Copyright (c) 2017, 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* 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.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @modules java.base/jdk.internal.misc:+open
*
* @summary converted from VM Testbase metaspace/gc/firstGC_default.
* VM Testbase keywords: [nonconcurrent, quarantine]
* VM Testbase comments: 8208250
*
* @library /vmTestbase /test/lib
* @run main/othervm
* -Xms200m
* -Xlog:gc+heap=trace,gc:gc.log
* -XX:+IgnoreUnrecognizedVMOptions
* -XX:+UnlockDiagnosticVMOptions
* -XX:-VerifyBeforeExit
* -XX:-UseCompressedOops
* metaspace.gc.FirstGCTest
*/