jdk/test/hotspot/jtreg/runtime/Monitor/GuaranteedAsyncDeflationIntervalTest.java

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 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
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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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 * 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 jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.process.ProcessTools;

/*
 * @test id=allDisabled
 * @bug 8305994
 * @summary Test the GuaranteedAsyncDeflationInterval option
 * @requires vm.flagless
 * @library /test/lib
 * @run driver GuaranteedAsyncDeflationIntervalTest allDisabled
 */

/*
 * @test id=guaranteedNoMUDT
 * @requires vm.flagless
 * @library /test/lib
 * @run driver GuaranteedAsyncDeflationIntervalTest guaranteedNoMUDT
 */

/*
 * @test id=guaranteedNoADI
 * @requires vm.flagless
 * @library /test/lib
 * @run driver GuaranteedAsyncDeflationIntervalTest guaranteedNoADI
 */

/*
 * @test id=allEnabled
 * @requires vm.flagless
 * @library /test/lib
 * @run driver GuaranteedAsyncDeflationIntervalTest allEnabled
 */

public class GuaranteedAsyncDeflationIntervalTest {

    public static class Test {
        // Inflate a lot of monitors, so that threshold heuristics definitely fires
        public static final int MONITORS = 10_000;

        public static Object[] monitors;

        public static void main(String... args) throws Exception {
            monitors = new Object[MONITORS];
            for (int i = 0; i < MONITORS; i++) {
                Object o = new Object();
                synchronized (o) {
                    try {
                        o.wait(1); // Inflate!
                    } catch (InterruptedException ie) {
                    }
                }
                monitors[i] = o;
            }

            try {
                Thread.sleep(10_000);
            } catch (InterruptedException ie) {
            }
        }
    }

    public static void main(String[] args) throws Exception {
        if (args.length < 1) {
            throw new IllegalArgumentException("Expect the test label");
        }

        String test = args[0];
        switch (test) {
            case "allDisabled":
                testAllDisabled();
                break;
            case "guaranteedNoMUDT":
                testGuaranteedNoMUDT();
                break;
            case "guaranteedNoADI":
                testGuaranteedNoADI();
                break;
            case "allEnabled":
                testAllEnabled();
                break;
            default:
                throw new IllegalArgumentException("Unknown test: " + test);
        }
    }

    static final String MSG_THRESHOLD  = "Async deflation needed: monitors used are above the threshold";
    static final String MSG_GUARANTEED = "Async deflation needed: guaranteed interval";

    // Try with all heuristics disabled
    public static void testAllDisabled() throws Exception {
        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
            "-Xmx100M",
            "-XX:+UnlockDiagnosticVMOptions",
            "-XX:GuaranteedAsyncDeflationInterval=0",
            "-XX:AsyncDeflationInterval=0",
            "-XX:MonitorUsedDeflationThreshold=0",
            "-Xlog:monitorinflation=info",
            "GuaranteedAsyncDeflationIntervalTest$Test");

        OutputAnalyzer oa = new OutputAnalyzer(pb.start());
        oa.shouldHaveExitValue(0);

        oa.shouldNotContain(MSG_THRESHOLD);
        oa.shouldNotContain(MSG_GUARANTEED);
        assertNoDeflations(oa);
    }

    // Try with guaranteed interval only enabled, threshold heuristics disabled via MUDT
    public static void testGuaranteedNoMUDT() throws Exception {
        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
            "-Xmx100M",
            "-XX:+UnlockDiagnosticVMOptions",
            "-XX:GuaranteedAsyncDeflationInterval=100",
            "-XX:MonitorUsedDeflationThreshold=0",
            "-Xlog:monitorinflation=info",
            "GuaranteedAsyncDeflationIntervalTest$Test");

        OutputAnalyzer oa = new OutputAnalyzer(pb.start());
        oa.shouldHaveExitValue(0);

        oa.shouldNotContain(MSG_THRESHOLD);
        oa.shouldContain(MSG_GUARANTEED);
        assertDeflations(oa);
    }

    // Try with guaranteed interval only enabled, threshold heuristics disabled via ADI
    public static void testGuaranteedNoADI() throws Exception {
        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
            "-Xmx100M",
            "-XX:+UnlockDiagnosticVMOptions",
            "-XX:GuaranteedAsyncDeflationInterval=100",
            "-XX:AsyncDeflationInterval=0",
            "-Xlog:monitorinflation=info",
            "GuaranteedAsyncDeflationIntervalTest$Test");

        OutputAnalyzer oa = new OutputAnalyzer(pb.start());
        oa.shouldHaveExitValue(0);

        oa.shouldNotContain(MSG_THRESHOLD);
        oa.shouldContain(MSG_GUARANTEED);
        assertDeflations(oa);
    }

    // Try with both threshold heuristics and guaranteed interval enabled
    public static void testAllEnabled() throws Exception {
        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
            "-Xmx100M",
            "-XX:+UnlockDiagnosticVMOptions",
            "-XX:GuaranteedAsyncDeflationInterval=5000",
            "-XX:MonitorUsedDeflationThreshold=10",
            "-Xlog:monitorinflation=info",
            "GuaranteedAsyncDeflationIntervalTest$Test");

        OutputAnalyzer oa = new OutputAnalyzer(pb.start());
        oa.shouldHaveExitValue(0);

        oa.shouldContain(MSG_THRESHOLD);
        oa.shouldContain(MSG_GUARANTEED);
        assertDeflations(oa);
    }

    private static void assertNoDeflations(OutputAnalyzer oa) {
        for (String line : oa.asLines()) {
            if (line.contains("Starting the final audit")) {
                // Final deflations started, with no prior deflations, good.
                return;
            }
            if (line.contains("begin deflating")) {
                // Deflations detected before final ones, bad
                oa.reportDiagnosticSummary();
                throw new IllegalStateException("FAILED");
            }
        }
    }

    private static void assertDeflations(OutputAnalyzer oa) {
        for (String line : oa.asLines()) {
            if (line.contains("Starting the final audit")) {
                // Final deflations started, with no prior deflations, bad.
                oa.reportDiagnosticSummary();
                throw new IllegalStateException("FAILED");
            }
            if (line.contains("begin deflating")) {
                // Deflations detected before final ones, good
                return;
            }
        }
    }
}