Re: [PATCH 0/3] vmsplice: make vmsplice a trivial wrapper for preadv2/pwritev2

Linus Torvalds <[email protected]> Fri, 5 Jun 2026 08:58:38 -0700

Newsgroups	org.kernel.vger.linux-api,dev.linux.lists.patches,org.kernel.vger.linux-fsdevel,org.kernel.vger.linux-kernel,org.kernel.vger.netdev,org.kvack.linux-mm
Message-ID	<CAHk-=whL0oLvmh3FO9SapDhgrXMT_d6qkP2V3OBjysOWXod2Og@mail.gmail.com>

On Fri, 5 Jun 2026 at 08:15, Stefan Metzmacher <[email protected]> wrote:
>
> It means the most common workload, e.g. a file only opened for
> file serving (or simple opens in general) would still be able to
> be optimized.

Nope. If your web server opens files with write access, I'd be
extremely surprised.

And if you don't have write access, and you're sending out data from
files you opened just for reading - the onle sane case - you hit all
the existing problems with "I can certainly look up pages, but I damn
well shouldn't pass those pages to the networking code without copying
them".

               Linus