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/*
* Copyright (c) 2013, 2019, 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.
*/
package gc.metaspace;
import java.util.List;
import java.lang.management.*;
import jdk.test.lib.Platform;
import static jdk.test.lib.Asserts.*;
import gc.testlibrary.PerfCounters;
/* @test TestPerfCountersAndMemoryPools
* @bug 8023476
* @library /test/lib /
* @requires vm.gc.Serial
* @summary Tests that a MemoryPoolMXBeans and PerfCounters for metaspace
* report the same data.
* @modules java.base/jdk.internal.misc
* java.management
* jdk.internal.jvmstat/sun.jvmstat.monitor
* @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-UseCompressedOops -XX:-UseCompressedClassPointers -XX:+UseSerialGC -XX:+UsePerfData -Xint gc.metaspace.TestPerfCountersAndMemoryPools
* @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UseCompressedOops -XX:+UseCompressedClassPointers -XX:+UseSerialGC -XX:+UsePerfData -Xint gc.metaspace.TestPerfCountersAndMemoryPools
*/
public class TestPerfCountersAndMemoryPools {
public static void main(String[] args) throws Exception {
checkMemoryUsage("Metaspace", "sun.gc.metaspace");
if (InputArguments.contains("-XX:+UseCompressedClassPointers") && Platform.is64bit()) {
checkMemoryUsage("Compressed Class Space", "sun.gc.compressedclassspace");
}
}
private static MemoryPoolMXBean getMemoryPool(String memoryPoolName) {
List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();
for (MemoryPoolMXBean pool : pools) {
if (pool.getName().equals(memoryPoolName)) {
return pool;
}
}
throw new RuntimeException("Excpted to find a memory pool with name " +
memoryPoolName);
}
private static void checkMemoryUsage(String memoryPoolName, String perfNS)
throws Exception {
MemoryPoolMXBean pool = getMemoryPool(memoryPoolName);
// First, call all the methods to let them allocate their own slab of metadata
getMinCapacity(perfNS);
getCapacity(perfNS);
getUsed(perfNS);
pool.getUsage().getInit();
pool.getUsage().getUsed();
pool.getUsage().getCommitted();
assertEQ(1L, 1L, "Make assert load");
// Must do a GC to update performance counters
System.gc();
assertEQ(getMinCapacity(perfNS), pool.getUsage().getInit(), "MinCapacity out of sync");
// Adding a second GC due to metadata allocations caused by getting the
// initial size from the pool. This is needed when running with -Xcomp.
System.gc();
assertEQ(getUsed(perfNS), pool.getUsage().getUsed(), "Used out of sync");
assertEQ(getCapacity(perfNS), pool.getUsage().getCommitted(), "Committed out of sync");
}
private static long getMinCapacity(String ns) throws Exception {
return PerfCounters.findByName(ns + ".minCapacity").longValue();
}
private static long getCapacity(String ns) throws Exception {
return PerfCounters.findByName(ns + ".capacity").longValue();
}
private static long getUsed(String ns) throws Exception {
return PerfCounters.findByName(ns + ".used").longValue();
}
}
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