[Bug 50281] fsync patch for wine 6.0-rc1 (without staging)

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=50281

--- Comment #15 from Zebediah Figura <z.figura12 at gmail.com> ---
(In reply to Shmerl from comment #14)
> If esync is in general not worse and
> even better than using fsync / futex2 why did they even bother adding that
> to the kernel?

In a few cases fsync does offer a non-negligible performance improvement. I'm
not sure it's ever been exactly established that fsync has less stable
performance consistently across test environments, either; I've just seen
multiple reports that it's worse for some applications.

And, as mentioned, I am dimly aware of other uses for vectored futex wait, or
at least intended uses, outside of Wine.

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