1 /*

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

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

     4  *

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

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

     7  * published by the Free Software Foundation.

     8  *

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

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

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

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

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

    21  * questions.

    22  *

    23  */

    24 

    25 /**

    26  * @test

    27  * @bug 8031320

    28  * @summary Verify that RTMSpinLoopCount affects time spent

    29  *          between locking attempts.

    30  * @library /testlibrary /testlibrary/whitebox /compiler/testlibrary

    31  * @build TestRTMSpinLoopCount

    32  * @run main ClassFileInstaller sun.hotspot.WhiteBox

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

    34  *                   -XX:+WhiteBoxAPI TestRTMSpinLoopCount

    35  */

    36 

    37 import java.util.List;

    38 import com.oracle.java.testlibrary.*;

    39 import com.oracle.java.testlibrary.cli.CommandLineOptionTest;

    40 import com.oracle.java.testlibrary.cli.predicate.AndPredicate;

    41 import rtm.*;

    42 import rtm.predicate.SupportedCPU;

    43 import rtm.predicate.SupportedVM;

    44 

    45 /**

    46  * Test verifies that RTMSpinLoopCount increase time spent between retries

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

    48  */

    49 public class TestRTMSpinLoopCount extends CommandLineOptionTest {

    50     private static final int LOCKING_TIME = 1000;

    51     private static final int RTM_RETRY_COUNT = 1000;

    52     private static final boolean INFLATE_MONITOR = true;

    53     private static final long MAX_ABORTS = RTM_RETRY_COUNT + 1L;

    54     private static final int[] SPIN_LOOP_COUNTS

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

    56 

    57     private TestRTMSpinLoopCount() {

    58         super(new AndPredicate(new SupportedVM(), new SupportedCPU()));

    59     }

    60 

    61     @Override

    62     protected void runTestCases() throws Throwable {

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

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

    65             aborts[i] = getAbortsCountOnLockBusy(

    66                     TestRTMSpinLoopCount.SPIN_LOOP_COUNTS[i]);

    67         }

    68 

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

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

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

    72         }

    73     }

    74 

    75     private long getAbortsCountOnLockBusy(int spinLoopCount) throws Throwable {

    76         CompilableTest test = new BusyLock();

    77 

    78         OutputAnalyzer outputAnalyzer = RTMTestBase.executeRTMTest(

    79                 test,

    80                 CommandLineOptionTest.prepareNumericFlag("RTMRetryCount",

    81                         TestRTMSpinLoopCount.RTM_RETRY_COUNT),

    82                 CommandLineOptionTest.prepareNumericFlag("RTMSpinLoopCount",

    83                         spinLoopCount),

    84                 "-XX:-UseRTMXendForLockBusy",

    85                 "-XX:RTMTotalCountIncrRate=1",

    86                 "-XX:+PrintPreciseRTMLockingStatistics",

    87                 BusyLock.class.getName(),

    88                 Boolean.toString(TestRTMSpinLoopCount.INFLATE_MONITOR),

    89                 Integer.toString(TestRTMSpinLoopCount.LOCKING_TIME)

    90         );

    91 

    92         outputAnalyzer.shouldHaveExitValue(0);

    93 

    94         List<RTMLockingStatistics> statistics = RTMLockingStatistics.fromString(

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

    96 

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

    98                 "VM output should contain exactly one entry for method "

    99                  + test.getMethodWithLockName());

   100 

   101         RTMLockingStatistics lock = statistics.get(0);

   102 

   103         Asserts.assertLTE(lock.getTotalAborts(),

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

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

   106                         lock.getTotalAborts(),

   107                         TestRTMSpinLoopCount.MAX_ABORTS));

   108 

   109         return lock.getTotalAborts();

   110     }

   111 

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

   113         new TestRTMSpinLoopCount().test();

   114     }

   115 }