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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
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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
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 *
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import jdk.test.lib.containers.systemd.SystemdRunOptions;
import jdk.test.lib.containers.systemd.SystemdTestUtils;
import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.whitebox.WhiteBox;
import jtreg.SkippedException;

/*
 * @test
 * @bug 8322420 8217338
 * @summary Memory/CPU awareness test for JDK-under-test inside a systemd slice.
 * @requires systemd.support
 * @library /test/lib
 * @modules java.base/jdk.internal.platform
 * @build HelloSystemd jdk.test.whitebox.WhiteBox
 * @run driver jdk.test.lib.helpers.ClassFileInstaller -jar whitebox.jar jdk.test.whitebox.WhiteBox
 * @run main/othervm -Xbootclasspath/a:whitebox.jar -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI SystemdMemoryAwarenessTest
 */
public class SystemdMemoryAwarenessTest {

    private static final int MB = 1024 * 1024;
    private static final WhiteBox wb = WhiteBox.getWhiteBox();
    private static final String TEST_SLICE_NAME = SystemdMemoryAwarenessTest.class.getSimpleName() + "HS";

    public static void main(String[] args) throws Exception {
       testHelloSystemd();
    }

    private static void testHelloSystemd() throws Exception {
        SystemdRunOptions opts = SystemdTestUtils.newOpts("HelloSystemd");
        // 1 GB memory, but the limit in the lower hierarchy is 512M
        opts.memoryLimit("1024M");
        int expectedMemLimit = 512;
        // expected detected limit we test for, 512MB
        opts.sliceDMemoryLimit(String.format("%dM", expectedMemLimit));
        int physicalCpus = wb.hostCPUs();
        if (physicalCpus < 2) {
           System.err.println("WARNING: host system only has " + physicalCpus + " cpus. Expected >= 2");
           System.err.println("The active_processor_count assertion will trivially pass.");
        }
        // Use a CPU core limit of 1 for best coverage
        int coreLimit = 1;
        System.out.println("DEBUG: Running test with a CPU limit of " + coreLimit);
        opts.cpuLimit(String.format("%d%%", coreLimit * 100));
        opts.sliceName(TEST_SLICE_NAME);

        OutputAnalyzer out = SystemdTestUtils.buildAndRunSystemdJava(opts);
        out.shouldHaveExitValue(0)
           .shouldContain("Hello Systemd")
           .shouldContain(String.format("Memory Limit is: %d", (expectedMemLimit * MB)));
        try {
            out.shouldContain("OSContainer::active_processor_count: " + coreLimit);
        } catch (RuntimeException e) {
            // CPU delegation needs to be enabled when run as user on cg v2
            if (SystemdTestUtils.RUN_AS_USER) {
                String hint = "When run as user on cg v2 cpu delegation needs to be configured!";
                throw new SkippedException(hint);
            }
            throw e;
        }
    }

}