test/java/nio/Buffer/LimitDirectMemory.java

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2002, 2016, Oracle and/or its affiliates. All rights reserved.
+ * 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.

@@ -19,10 +19,39 @@
  * 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;