--- old/src/java.base/share/classes/sun/nio/ch/IOUtil.java	2016-09-29 14:26:26.410927321 -0700
+++ new/src/java.base/share/classes/sun/nio/ch/IOUtil.java	2016-09-29 14:26:26.295927320 -0700
@@ -29,6 +29,11 @@
 import java.io.IOException;
 import java.nio.ByteBuffer;
 
+import jdk.internal.misc.JavaIOFileDescriptorAccess;
+import jdk.internal.misc.JavaNioAccess;
+import jdk.internal.misc.SharedSecrets;
+import jdk.internal.ref.Cleaner;
+import sun.security.action.GetPropertyAction;
 
 /**
  * File-descriptor based I/O utilities that are shared by NIO classes.
@@ -41,6 +46,9 @@
      */
     static final int IOV_MAX;
 
+    private static final JavaIOFileDescriptorAccess fdAccess =
+       SharedSecrets.getJavaIOFileDescriptorAccess();
+
     private IOUtil() { }                // No instantiation
 
     static int write(FileDescriptor fd, ByteBuffer src, long position,
@@ -86,11 +94,19 @@
         if (rem == 0)
             return 0;
         if (position != -1) {
-            written = nd.pwrite(fd,
-                                ((DirectBuffer)bb).address() + pos,
-                                rem, position);
+            if (fdAccess.getDirect(fd))
+                written = nd.pwriteDirect(fd,
+                                          ((DirectBuffer)bb).address() + pos,
+                                          rem, position);
+            else
+                written = nd.pwrite(fd,
+                                    ((DirectBuffer)bb).address() + pos,
+                                    rem, position);
         } else {
-            written = nd.write(fd, ((DirectBuffer)bb).address() + pos, rem);
+            if (fdAccess.getDirect(fd))
+                written = nd.writeDirect(fd, ((DirectBuffer)bb).address() + pos, rem);
+            else
+                written = nd.write(fd, ((DirectBuffer)bb).address() + pos, rem);
         }
         if (written > 0)
             bb.position(pos + written);
@@ -145,7 +161,11 @@
             if (iov_len == 0)
                 return 0L;
 
-            long bytesWritten = nd.writev(fd, vec.address, iov_len);
+            long bytesWritten;
+            if (fdAccess.getDirect(fd))          
+                bytesWritten = nd.writevDirect(fd, vec.address, iov_len);
+            else
+                bytesWritten = nd.writev(fd, vec.address, iov_len);
 
             // Notify the buffers how many bytes were taken
             long left = bytesWritten;
@@ -217,10 +237,17 @@
             return 0;
         int n = 0;
         if (position != -1) {
-            n = nd.pread(fd, ((DirectBuffer)bb).address() + pos,
-                         rem, position);
+            if (fdAccess.getDirect(fd))
+                n = nd.preadDirect(fd, ((DirectBuffer)bb).address() + pos,
+                             rem, position);
+            else
+                n = nd.pread(fd, ((DirectBuffer)bb).address() + pos,
+                             rem, position);
         } else {
-            n = nd.read(fd, ((DirectBuffer)bb).address() + pos, rem);
+            if (fdAccess.getDirect(fd))
+                n = nd.readDirect(fd, ((DirectBuffer)bb).address() + pos, rem);
+            else
+                n = nd.read(fd, ((DirectBuffer)bb).address() + pos, rem);
         }
         if (n > 0)
             bb.position(pos + n);
@@ -274,8 +301,11 @@
             }
             if (iov_len == 0)
                 return 0L;
-
-            long bytesRead = nd.readv(fd, vec.address, iov_len);
+            long bytesRead;
+            if (fdAccess.getDirect(fd))
+                bytesRead = nd.readvDirect(fd, vec.address, iov_len);
+            else
+                bytesRead = nd.readv(fd, vec.address, iov_len);
 
             // Notify the buffers how many bytes were read
             long left = bytesRead;