--- a/jdk/test/java/nio/Buffer/LimitDirectMemory.java	Tue May 30 21:14:45 2017 -0700
+++ b/jdk/test/java/nio/Buffer/LimitDirectMemory.java	Wed May 31 14:00:55 2017 +0800
@@ -1,5 +1,5 @@
 /*
- * 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
@@ -21,6 +21,35 @@
  * 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;
 
@@ -28,8 +57,13 @@
     private static final int K = 1024;
 
     public static void main(String [] args) throws Exception {
-        if (args.length < 2)
-            throw new RuntimeException();
+        if (args.length < 2) {
+            throw new IllegalArgumentException("Usage: "
+                    + "java LimitDirectMemory"
+                    + " <OOME_expected(true|false)>"
+                    + " <fill_direct_memory>"
+                    + " <size_per_buffer>");
+        }
         boolean throwp = parseThrow(args[0]);
         int size = parseSize(args[1]);
         int incr = (args.length > 2 ? parseSize(args[2]) : size);