jdk

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/*
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 * Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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package gc;
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/**
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 * @test id=Serial
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 * @requires vm.gc.Serial
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 * @summary Verify the expected space counters exist.
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 * @modules java.base/jdk.internal.misc
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 * @modules java.management/sun.management
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 * @modules jdk.internal.jvmstat/sun.jvmstat.monitor
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 * @library /test/lib /
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 * @run main/othervm -XX:+UseSerialGC -XX:+UsePerfData gc.TestSpaceCounters
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 */
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/**
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 * @test id=Parallel
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 * @requires vm.gc.Parallel
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 * @summary Verify the expected space counters exist.
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 * @modules java.base/jdk.internal.misc
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 * @modules java.management/sun.management
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 * @modules jdk.internal.jvmstat/sun.jvmstat.monitor
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 * @library /test/lib /
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 * @run main/othervm -XX:+UseParallelGC -XX:+UsePerfData gc.TestSpaceCounters
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 */
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import gc.testlibrary.Helpers;
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import gc.testlibrary.PerfCounter;
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import gc.testlibrary.PerfCounters;
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import sun.jvmstat.monitor.MonitorException;
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public class TestSpaceCounters {
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    private static final String GENERATION_NAMESPACE = "sun.gc.generation.";
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    // Each space has these counters.
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    private static final String[] COUNTER_NAMES = {
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        "maxCapacity", "capacity", "used", "initCapacity" };
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    private static String counterName(String name, int generation, int space) {
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        return GENERATION_NAMESPACE + generation + ".space." + space + "." + name;
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    }
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    private static PerfCounter counter(String name, int generation, int space) {
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        String cname = counterName(name, generation, space);
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        try {
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            return PerfCounters.findByName(cname);
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        } catch (MonitorException e) {
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            throw new RuntimeException(e.toString());
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        }
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    }
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    private static long value(String name, int generation, int space) {
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        PerfCounter pc = counter(name, generation, space);
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        return pc.longValue();
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    }
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    private static void checkCounters(int generation, int space) {
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        for (int i = 0; i < COUNTER_NAMES.length; ++i) {
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            value(COUNTER_NAMES[i], generation, space);
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        }
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    }
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    private static final int YOUNG_GENERATION = 0;
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    private static final int OLD_GENERATION = 1;
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    public static void main(String[] args) {
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        // Young Generation has 3 spaces - eden, and two survivor spaces.
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        checkCounters(YOUNG_GENERATION, 0);
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        checkCounters(YOUNG_GENERATION, 1);
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        checkCounters(YOUNG_GENERATION, 2);
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        // Old Generation has 1 space.
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        checkCounters(OLD_GENERATION, 0);
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    }
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}
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