test/java/nio/Buffer/LimitDirectMemory.java

*** 1,7 ****
  /*
!  * Copyright (c) 2002, 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.
--- 1,7 ----
  /*
!  * Copyright (c) 2002, 2017, 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.
*** 19,28 ****
--- 19,57 ----
   * 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 4627316 6743526
+  * @summary Test option to limit direct memory allocation
+  * @requires (os.arch == "x86_64") | (os.arch == "amd64") | (os.arch == "sparcv9")
+  * @library /test/lib
+  *
+  * @summary Test: memory is properly limited using multiple buffers
+  * @run main/othervm -XX:MaxDirectMemorySize=10 LimitDirectMemory true 10 1
+  * @run main/othervm -XX:MaxDirectMemorySize=1k LimitDirectMemory true 1k 100
+  * @run main/othervm -XX:MaxDirectMemorySize=10m LimitDirectMemory true 10m 10m
+  *
+  * @summary Test: We can increase the amount of available memory
+  * @run main/othervm -XX:MaxDirectMemorySize=65M LimitDirectMemory false 64M 65M
+  *
+  * @summary Test: Exactly the default amount of memory is available
+  * @run main/othervm LimitDirectMemory false 10 1
+  * @run main/othervm -Xmx64m LimitDirectMemory false 0 DEFAULT
+  * @run main/othervm -Xmx64m LimitDirectMemory true 0 DEFAULT+1
+  *
+  * @summary Test: We should be able to eliminate direct memory allocation entirely
+  * @run main/othervm -XX:MaxDirectMemorySize=0 LimitDirectMemory true 0 1
+  *
+  * @summary Test: Setting the system property should not work so we should be able
+  *                to allocate the default amount
+  * @run main/othervm -Dsun.nio.MaxDirectMemorySize=1K -Xmx64m 
+  *                   LimitDirectMemory false DEFAULT-1 DEFAULT/2
+  */
+ 
  import java.nio.ByteBuffer;
  import java.util.Properties;
  
  public class LimitDirectMemory {
      private static final int K = 1024;