1 /*
 2  * Copyright (c) 2018, 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  * @test TestConcurrentSystemGC
26  * @bug 8195158
27  * @summary Test that a System.gc() with -XX:+ExplicitGCInvokesConcurrent
28  *          is *not* upgraded to STW full GC
29  * @key gc
30  * @requires vm.gc.G1
31  * @library /test/lib
32  * @modules java.base/jdk.internal.misc
33  *          java.management
34  * @run main/othervm -XX:+UseG1GC -XX:+ExplicitGCInvokesConcurrent -Xmx8m -Xms8m -XX:G1HeapRegionSize=1m TestConcurrentSystemGC
35  */
36 
37 import java.util.ArrayList;
38 import java.util.List;
39 
40 public class TestConcurrentSystemGC {
41     public static List<char[]> memory;
42     public static void main(String[] args) throws Exception {
43         memory = new ArrayList<>();
44         try {
45             while (true) {
46                 memory.add(new char[1024 * 128]);
47                 System.gc(); // should not trigger any assertions
48             }
49         } catch (OutOfMemoryError e) {
50             memory = null;
51             System.gc();
52         }
53     }
54 }