TestRTMAbortRatio.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * 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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/**
 * @test
 * @bug 8031320
 * @summary Verify that RTMAbortRatio affects amount of aborts before
 *          deoptimization.
 * @library /testlibrary /testlibrary/whitebox /compiler/testlibrary
 * @build TestRTMAbortRatio
 * @run main ClassFileInstaller sun.hotspot.WhiteBox
 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
 *                   -XX:+WhiteBoxAPI TestRTMAbortRatio
 */

import java.util.List;
import com.oracle.java.testlibrary.*;
import com.oracle.java.testlibrary.cli.CommandLineOptionTest;
import com.oracle.java.testlibrary.cli.predicate.AndPredicate;
import rtm.*;
import rtm.predicate.SupportedCPU;
import rtm.predicate.SupportedVM;
import sun.misc.Unsafe;

/**
 * Test verifies that method will be deoptimized on high abort ratio
 * as soon as abort ratio reaches RTMAbortRatio's value.
 */
public class TestRTMAbortRatio extends CommandLineOptionTest {
    private TestRTMAbortRatio() {
        super(new AndPredicate(new SupportedCPU(), new SupportedVM()));
    }

    @Override
    protected void runTestCases() throws Throwable {
        verifyAbortRatio(0, false);
        verifyAbortRatio(10, false);
        verifyAbortRatio(50, false);
        verifyAbortRatio(100, false);

        verifyAbortRatio(0, true);
        verifyAbortRatio(10, true);
        verifyAbortRatio(50, true);
        verifyAbortRatio(100, true);
    }

    private void verifyAbortRatio(int abortRatio, boolean useStackLock)
            throws Throwable {
        CompilableTest test = new Test();

        OutputAnalyzer outputAnalyzer = RTMTestBase.executeRTMTest(
                test,
                CommandLineOptionTest.prepareBooleanFlag("UseRTMForStackLocks",
                        useStackLock),
                "-XX:+UseRTMDeopt",
                "-XX:RTMTotalCountIncrRate=1",
                "-XX:RTMAbortThreshold=0",
                CommandLineOptionTest.prepareNumericFlag("RTMLockingThreshold",
                        10 * Test.TOTAL_ITERATIONS),
                CommandLineOptionTest.prepareNumericFlag("RTMAbortRatio",
                        abortRatio),
                "-XX:+PrintPreciseRTMLockingStatistics",
                test.getClass().getName(),
                Boolean.toString(!useStackLock));

        outputAnalyzer.shouldHaveExitValue(0);

        List<RTMLockingStatistics> statistics = RTMLockingStatistics.fromString(
                test.getMethodWithLockName(), outputAnalyzer.getOutput());

        Asserts.assertEQ(statistics.size(), 1, "VM output should contain "
                + "exactly one RTM locking statistics entry.");

        RTMLockingStatistics lock = statistics.get(0);
        int actualRatio;

        if (lock.getTotalAborts() == 1L) {
            actualRatio = 0;
        } else {
            actualRatio = (int) (lock.getTotalLocks()
                    / (lock.getTotalAborts() - 1L));
        }

        Asserts.assertLTE(actualRatio, abortRatio, String.format(
                "Actual abort ratio (%d) should lower or equal to "
                + "specified (%d).", actualRatio, abortRatio));
    }

    /**
     * Force abort after {@code Test.WARMUP_ITERATIONS} is done.
     */
    public static class Test implements CompilableTest {
        private static final int TOTAL_ITERATIONS = 10000;
        private static final int WARMUP_ITERATIONS = 1000;
        private static final Unsafe UNSAFE = Utils.getUnsafe();
        private final Object monitor = new Object();
        // Following field have to be static in order to avoid escape analysis.
        @SuppressWarnings("UnsuedDeclaration")
        private static int field = 0;

        @Override
        public String getMethodWithLockName() {
             return this.getClass().getName() + "::lock";
         }

        @Override
        public String[] getMethodsToCompileNames() {
            return new String[] {
                    getMethodWithLockName(),
                    Unsafe.class.getName() + "::addressSize"
            };
        }

        public void lock(boolean abort) {
            synchronized(monitor) {
                if (abort) {
                    Test.UNSAFE.addressSize();
                }
            }
        }

        /**
         * Usage:
         * Test &lt;inflate monitor&gt;
         */
        public static void main(String args[]) throws Throwable {
            Asserts.assertGTE(args.length, 1, "One argument required.");
            Test t = new Test();
            if (Boolean.valueOf(args[0])) {
                AbortProvoker.inflateMonitor(t.monitor);
            }
            for (int i = 0; i < Test.TOTAL_ITERATIONS; i++) {
                t.lock(i >= Test.WARMUP_ITERATIONS);
            }
        }
    }

    public static void main(String args[]) throws Throwable {
        new TestRTMAbortRatio().test();
    }
}