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From: Stefano Garzarella <sgarzare@redhat.com>
To: Jens Axboe <axboe@kernel.dk>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>,
	io-uring@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH] io_uring: wakeup threads waiting for EPOLLOUT events
Date: Thu, 16 Jan 2020 18:03:42 +0100
Message-ID: <20200116170342.4jvkhbbw4x6z3txn@steredhat> (raw)
In-Reply-To: <a02a58dc-bf23-ed74-aec6-52c85360fe00@kernel.dk>

On Thu, Jan 16, 2020 at 09:30:12AM -0700, Jens Axboe wrote:
> On 1/16/20 9:26 AM, Stefano Garzarella wrote:
> >> Since the use case is mostly single submitter, unless you're doing
> >> something funky or unusual, you're not going to be needing POLLOUT ever.
> > 
> > The case that I had in mind was with kernel side polling enabled and
> > a single submitter that can use epoll() to wait free slots in the SQ
> > ring. (I don't have a test, maybe I can write one...)
> 
> Right, I think that's the only use case where it makes sense, because
> you have someone else draining the sq side for you. A test case would
> indeed be nice, liburing has a good arsenal of test cases and this would
> be a good addition!

Sure, I'll send a test to liburing for this case!

Thanks,
Stefano


      reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-16 13:49 Stefano Garzarella
2020-01-16 15:29 ` Jens Axboe
2020-01-16 15:55   ` Stefano Garzarella
2020-01-16 16:00     ` Jens Axboe
2020-01-16 16:26       ` Stefano Garzarella
2020-01-16 16:30         ` Jens Axboe
2020-01-16 17:03           ` Stefano Garzarella [this message]

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