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/*
* Copyright (c) 2014, 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
* @key gc
* @bug 8049831
* @library /testlibrary /testlibrary/whitebox
* @build TestCMSClassUnloadingEnabledHWM
* @run main ClassFileInstaller sun.hotspot.WhiteBox
* @run driver TestCMSClassUnloadingEnabledHWM
* @summary Test that -XX:-CMSClassUnloadingEnabled will trigger a Full GC when more than MetaspaceSize metadata is allocated.
*/
import com.oracle.java.testlibrary.OutputAnalyzer;
import com.oracle.java.testlibrary.ProcessTools;
import java.lang.management.GarbageCollectorMXBean;
import java.lang.management.ManagementFactory;
import java.util.ArrayList;
import java.util.Arrays;
import sun.hotspot.WhiteBox;
public class TestCMSClassUnloadingEnabledHWM {
private static long MetaspaceSize = 32 * 1024 * 1024;
private static long YoungGenSize = 32 * 1024 * 1024;
private static OutputAnalyzer run(boolean enableUnloading) throws Exception {
ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
"-Xbootclasspath/a:.",
"-XX:+UnlockDiagnosticVMOptions",
"-XX:+WhiteBoxAPI",
"-Xmx128m",
"-XX:CMSMaxAbortablePrecleanTime=1",
"-XX:CMSWaitDuration=50",
"-XX:MetaspaceSize=" + MetaspaceSize,
"-Xmn" + YoungGenSize,
"-XX:+UseConcMarkSweepGC",
"-XX:" + (enableUnloading ? "+" : "-") + "CMSClassUnloadingEnabled",
"-XX:+PrintHeapAtGC",
"-XX:+PrintGCDetails",
"-XX:+PrintGCTimeStamps",
TestCMSClassUnloadingEnabledHWM.AllocateBeyondMetaspaceSize.class.getName(),
"" + MetaspaceSize);
return new OutputAnalyzer(pb.start());
}
public static OutputAnalyzer runWithCMSClassUnloading() throws Exception {
return run(true);
}
public static OutputAnalyzer runWithoutCMSClassUnloading() throws Exception {
return run(false);
}
public static void testWithoutCMSClassUnloading() throws Exception {
// -XX:-CMSClassUnloadingEnabled is used, so we expect a full GC instead of a concurrent cycle.
OutputAnalyzer out = runWithoutCMSClassUnloading();
out.shouldMatch(".*Full GC.*");
out.shouldNotMatch(".*CMS Initial Mark.*");
}
public static void testWithCMSClassUnloading() throws Exception {
// -XX:+CMSClassUnloadingEnabled is used, so we expect a concurrent cycle instead of a full GC.
OutputAnalyzer out = runWithCMSClassUnloading();
out.shouldMatch(".*CMS Initial Mark.*");
out.shouldNotMatch(".*Full GC.*");
}
public static void main(String args[]) throws Exception {
testWithCMSClassUnloading();
testWithoutCMSClassUnloading();
}
public static class AllocateBeyondMetaspaceSize {
public static void main(String [] args) throws Exception {
if (args.length != 1) {
throw new IllegalArgumentException("Usage: <MetaspaceSize>");
}
WhiteBox wb = WhiteBox.getWhiteBox();
// Allocate past the MetaspaceSize limit.
long metaspaceSize = Long.parseLong(args[0]);
long allocationBeyondMetaspaceSize = metaspaceSize * 2;
long metaspace = wb.allocateMetaspace(null, allocationBeyondMetaspaceSize);
// Wait for at least one GC to occur. The caller will parse the log files produced.
GarbageCollectorMXBean cmsGCBean = getCMSGCBean();
while (cmsGCBean.getCollectionCount() == 0) {
Thread.sleep(100);
}
wb.freeMetaspace(null, metaspace, metaspace);
}
private static GarbageCollectorMXBean getCMSGCBean() {
for (GarbageCollectorMXBean gcBean : ManagementFactory.getGarbageCollectorMXBeans()) {
if (gcBean.getObjectName().toString().equals("java.lang:type=GarbageCollector,name=ConcurrentMarkSweep")) {
return gcBean;
}
}
return null;
}
}
}
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