RFR: 8274113: (fc) Tune FileChannel.transferFrom() [v4]

[Alan Bateman]

On Thu, 12 May 2022 15:40:50 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>> This request proposes to change `FileChannel.transferFrom()` to add a fast path on Linux and a threshold for mapped transfers on all platforms.
>
> Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8274113: Remove volatile write of false to transferXXXNotSupported

Marked as reviewed by alanb (Reviewer).

-------------

PR: https://git.openjdk.java.net/jdk/pull/8644