jdk-24/hotspot/test/gc/metaspace/TestMetaspacePerfCounters.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * 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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import java.util.List;
import java.util.ArrayList;

import com.oracle.java.testlibrary.*;
import static com.oracle.java.testlibrary.Asserts.*;

/* @test TestMetaspacePerfCounters
 * @bug 8014659
 * @requires vm.gc=="null"
 * @library /testlibrary
 * @summary Tests that performance counters for metaspace and compressed class
 *          space exists and works.
 *
 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-UseCompressedOops -XX:-UseCompressedClassPointers -XX:+UsePerfData -XX:+UseSerialGC TestMetaspacePerfCounters
 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-UseCompressedOops -XX:-UseCompressedClassPointers -XX:+UsePerfData -XX:+UseParallelGC -XX:+UseParallelOldGC TestMetaspacePerfCounters
 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-UseCompressedOops -XX:-UseCompressedClassPointers -XX:+UsePerfData -XX:+UseG1GC TestMetaspacePerfCounters
 *
 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UseCompressedOops -XX:+UseCompressedClassPointers -XX:+UsePerfData -XX:+UseSerialGC TestMetaspacePerfCounters
 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UseCompressedOops -XX:+UseCompressedClassPointers -XX:+UsePerfData -XX:+UseParallelGC -XX:+UseParallelOldGC TestMetaspacePerfCounters
 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UseCompressedOops -XX:+UseCompressedClassPointers -XX:+UsePerfData -XX:+UseG1GC TestMetaspacePerfCounters
 */
public class TestMetaspacePerfCounters {
    public static Class fooClass = null;
    private static final String[] counterNames = {"minCapacity", "maxCapacity", "capacity", "used"};

    public static void main(String[] args) throws Exception {
        String metaspace = "sun.gc.metaspace";
        String ccs = "sun.gc.compressedclassspace";

        checkPerfCounters(metaspace);

        if (isUsingCompressedClassPointers()) {
            checkPerfCounters(ccs);
            checkUsedIncreasesWhenLoadingClass(ccs);
        } else {
            checkEmptyPerfCounters(ccs);
            checkUsedIncreasesWhenLoadingClass(metaspace);
        }
    }

    private static void checkPerfCounters(String ns) throws Exception {
        long minCapacity = getMinCapacity(ns);
        long maxCapacity = getMaxCapacity(ns);
        long capacity = getCapacity(ns);
        long used = getUsed(ns);

        assertGTE(minCapacity, 0L);
        assertGTE(used, minCapacity);
        assertGTE(capacity, used);
        assertGTE(maxCapacity, capacity);
    }

    private static void checkEmptyPerfCounters(String ns) throws Exception {
        for (PerfCounter counter : countersInNamespace(ns)) {
            String msg = "Expected " + counter.getName() + " to equal 0";
            assertEQ(counter.longValue(), 0L, msg);
        }
    }

    private static void checkUsedIncreasesWhenLoadingClass(String ns) throws Exception {
        long before = getUsed(ns);
        fooClass = compileAndLoad("Foo", "public class Foo { }");
        System.gc();
        long after = getUsed(ns);

        assertGT(after, before);
    }

    private static List<PerfCounter> countersInNamespace(String ns) throws Exception {
        List<PerfCounter> counters = new ArrayList<>();
        for (String name : counterNames) {
            counters.add(PerfCounters.findByName(ns + "." + name));
        }
        return counters;
    }

    private static Class<?> compileAndLoad(String name, String source) throws Exception {
        byte[] byteCode = InMemoryJavaCompiler.compile(name, source);
        return ByteCodeLoader.load(name, byteCode);
    }

    private static boolean isUsingCompressedClassPointers() {
        return Platform.is64bit() && InputArguments.contains("-XX:+UseCompressedClassPointers");
    }

    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 getMaxCapacity(String ns) throws Exception {
        return PerfCounters.findByName(ns + ".maxCapacity").longValue();
    }

    private static long getUsed(String ns) throws Exception {
        return PerfCounters.findByName(ns + ".used").longValue();
    }
}