/*

 * Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * 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.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/**

 * @test

 * @bug 8031320

 * @summary Verify that RTMSpinLoopCount affects time spent

 *          between locking attempts.

 * @library /test/lib /

 * @modules java.base/jdk.internal.misc

 *          java.management

 * @requires vm.flavor == "server" & !vm.emulatedClient & vm.rtm.cpu & vm.rtm.os

 * @build sun.hotspot.WhiteBox

 * @run driver ClassFileInstaller sun.hotspot.WhiteBox

 *                                sun.hotspot.WhiteBox$WhiteBoxPermission

 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions

 *                   -XX:+WhiteBoxAPI

 *                   compiler.rtm.locking.TestRTMSpinLoopCount

 */

package compiler.rtm.locking;

import compiler.testlibrary.rtm.BusyLock;

import compiler.testlibrary.rtm.CompilableTest;

import compiler.testlibrary.rtm.RTMLockingStatistics;

import compiler.testlibrary.rtm.RTMTestBase;

import jdk.test.lib.Asserts;

import jdk.test.lib.process.OutputAnalyzer;

import jdk.test.lib.cli.CommandLineOptionTest;

import java.util.List;

/**

 * Test verifies that RTMSpinLoopCount increase time spent between retries

 * by comparing amount of retries done with different RTMSpinLoopCount's values.

 */

public class TestRTMSpinLoopCount {

    private static final int LOCKING_TIME = 1000;

    private static final int RTM_RETRY_COUNT = 1000;

    private static final boolean INFLATE_MONITOR = true;

    private static final long MAX_ABORTS = RTM_RETRY_COUNT + 1L;

    private static final int[] SPIN_LOOP_COUNTS

            = new int[] { 0, 100, 1_000, 1_000_000, 10_000_000 };

    protected void runTestCases() throws Throwable {

        long[] aborts = new long[TestRTMSpinLoopCount.SPIN_LOOP_COUNTS.length];

        for (int i = 0; i < TestRTMSpinLoopCount.SPIN_LOOP_COUNTS.length; i++) {

            aborts[i] = getAbortsCountOnLockBusy(

                    TestRTMSpinLoopCount.SPIN_LOOP_COUNTS[i]);

        }

        for (int i = 1; i < aborts.length; i++) {

            Asserts.assertLTE(aborts[i], aborts[i - 1], "Increased spin loop "

                    + "count should not increase retries count.");

        }

    }

    private long getAbortsCountOnLockBusy(int spinLoopCount) throws Throwable {

        CompilableTest test = new BusyLock();

        OutputAnalyzer outputAnalyzer = RTMTestBase.executeRTMTest(

                test,

                CommandLineOptionTest.prepareNumericFlag("RTMRetryCount",

                        TestRTMSpinLoopCount.RTM_RETRY_COUNT),

                CommandLineOptionTest.prepareNumericFlag("RTMSpinLoopCount",

                        spinLoopCount),

                "-XX:-UseRTMXendForLockBusy",

                "-XX:RTMTotalCountIncrRate=1",

                "-XX:+PrintPreciseRTMLockingStatistics",

                BusyLock.class.getName(),

                Boolean.toString(TestRTMSpinLoopCount.INFLATE_MONITOR),

                Integer.toString(TestRTMSpinLoopCount.LOCKING_TIME)

        );

        outputAnalyzer.shouldHaveExitValue(0);

        List<RTMLockingStatistics> statistics = RTMLockingStatistics.fromString(

                test.getMethodWithLockName(), outputAnalyzer.getOutput());

        Asserts.assertEQ(statistics.size(), 1,

                "VM output should contain exactly one entry for method "

                 + test.getMethodWithLockName());

        RTMLockingStatistics lock = statistics.get(0);

        Asserts.assertLTE(lock.getTotalAborts(),

                TestRTMSpinLoopCount.MAX_ABORTS, String.format("Total aborts "

                        + "count (%d) should be less or equal to %d",

                        lock.getTotalAborts(),

                        TestRTMSpinLoopCount.MAX_ABORTS));

        return lock.getTotalAborts();

    }

    public static void main(String args[]) throws Throwable {

        new TestRTMSpinLoopCount().runTestCases();

    }

}