RFR: 8274113: (fc) Tune FileChannel.transferFrom() [v2]

[Alan Bateman]

On Tue, 10 May 2022 23:32:42 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 refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:
> 
>   8274113: (fc) Tune FileChannel.transferFrom()

Overall I think this looks good. It would be useful to add some performance data to the PR to demonstrate the improvement.

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Marked as reviewed by alanb (Reviewer).

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