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Date: Thu, 27 Mar 2025 08:27:24 -0600
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Subject: Re: [GIT PULL] io_uring epoll reaping support
From: Jens Axboe <axboe@kernel.dk>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: io-uring <io-uring@vger.kernel.org>
References: <3ad3c346-1415-45bd-bcb2-2f9b46164f30@kernel.dk>
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On 3/27/25 5:47 AM, Jens Axboe wrote:
> Hi Linus,
>
> This sits on top of the recently sent out zero-copy rx pull request.
>
> This adds support for reading epoll events via io_uring. While this may
> seem counter-intuitive (and/or productive), the reasoning here is that
> quite a few existing epoll event loops can easily do a partial
> conversion to a completion based model, but are still stuck with one (or
> few) event types that remain readiness based. For that case, they then
> need to add the io_uring fd to the epoll context, and continue to rely
> on epoll_wait(2) for waiting on events. This misses out on the finer
> grained waiting that io_uring can do, to reduce context switches and
> wait for multiple events in one batch reliably.
>
> With adding support for reaping epoll events via io_uring, the whole
> legacy readiness based event types can still be reaped via epoll, with
> the overall waiting in the loop be driven by io_uring.
>
> Relies on a prep patch that went in via the VFS tree already. Please
> pull!
And even with having prepared this earlier, guess a big conference dinner
was enough to still make me mess this up. The correct git location is of
course:
git://git.kernel.dk/linux.git for-6.15/io_uring-epoll-wait-20250325
which is what I get for creating the signed tag later than the actual
PR write-up.
Everything else in the original should be fine as-is, thanks!
--
Jens Axboe