Backporting the FileChannel.transferTo (Windows) improvement to OpenJDK v7

[Martin Sawicki (MS OPEN TECH)]

Hello,



We'd like to propose to back-port our FileChannel.transferTo() performance improvement for Windows that was recently accepted into OpenJDK v9 and v8 to v7. The original JDKv9 fix just for reference: http://hg.openjdk.java.net/jdk9/dev/jdk/rev/ba6d8f56003b.



Our suggested webrev patch for OpenJDK v7 is attached to this email, based on our understanding of the back-porting steps.

Your review and acceptance of this contribution would be appreciated.



Best regards,

Martin Sawicki (and Kirk Shoop, and Valeriy Kopylov)

Microsoft Open Technologies, Inc.

A subsidiary of Microsoft Corp.