1 /*

     2  * Copyright (c) 2018, Red Hat, Inc. 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  * @test TestCommonGCLoads

    26  * @summary Test GC state load commoning works

    27  * @key gc

    28  * @requires vm.flavor == "server"

    29  * @requires vm.gc.Shenandoah

    30  * @run main/othervm -XX:-BackgroundCompilation -XX:-UseOnStackReplacement -XX:-TieredCompilation

    31  *                   -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC

    32  *                   -XX:-ShenandoahCommonGCStateLoads

    33  *                   TestCommonGCLoads

    34  * @run main/othervm -XX:-BackgroundCompilation -XX:-UseOnStackReplacement -XX:-TieredCompilation

    35  *                   -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC

    36  *                   -XX:+ShenandoahCommonGCStateLoads

    37  *                   TestCommonGCLoads

    38  */

    39 

    40 public class TestCommonGCLoads {

    41 

    42     static Object d = new Object();

    43 

    44     static Target t1 = new Target();

    45     static Target t2 = new Target();

    46     static Target t3 = new Target();

    47     static Target t4 = new Target();

    48     static Target t5 = new Target();

    49 

    50     static void test() {

    51         t1.field = d;

    52         t2.field = d;

    53         t3.field = d;

    54         t4.field = d;

    55         t5.field = d;

    56     }

    57 

    58     static public void main(String[] args) {

    59         for (int i = 0; i < 100_000; i++) {

    60             test();

    61         }

    62     }

    63 

    64     static class Target {

    65         Object field;

    66     }

    67 }