Linux-Fsdevel Archive on lore.kernel.org
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From: Jens Axboe <axboe@kernel.dk>
To: Stefano Garzarella <sgarzare@redhat.com>
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 09:30:12 -0700
Message-ID: <a02a58dc-bf23-ed74-aec6-52c85360fe00@kernel.dk> (raw)
In-Reply-To: <20200116162630.6r3xc55kdyyq5tvz@steredhat>

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!

-- 
Jens Axboe


  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 [this message]
2020-01-16 17:03           ` Stefano Garzarella

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