Re: [PATCH 0/8] Various io_uring micro-optimizations (reducing lock contention)

[Max Kellermann]

On Sat, Feb 1, 2025 at 4:26 PM Jens Axboe <axboe@xxxxxxxxx> wrote:
> > Not a huge fan of adding more epoll logic to io_uring, but you are right
> > this case may indeed make sense as it allows you to integrate better
> > that way in existing event loops. I'll take a look.
>
> Here's a series doing that:
>
> https://git.kernel.dk/cgit/linux/log/?h=io_uring-epoll-wait
>
> Could actually work pretty well - the last patch adds multishot support
> as well, which means we can avoid the write lock dance for repeated
> triggers of this epoll event. That should actually end up being more
> efficient than regular epoll_wait(2).

Nice, thanks Jens! I will integrate this in our I/O event loop and
test it next week. This will eliminate the io_uring poll wakeup
overhead completely.