From: Pavel Begunkov <asml.silence@gmail.com>
To: Jens Axboe <axboe@kernel.dk>,
io-uring@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] io_uring: don't wait when under-submitting
Date: Sat, 14 Dec 2019 17:44:23 +0300 [thread overview]
Message-ID: <28db945c-080f-1951-b4ff-b315f2d0be68@gmail.com> (raw)
In-Reply-To: <55f01a72-fcbc-a3e4-d9db-7dd2a7ef1acd@kernel.dk>
[-- Attachment #1.1: Type: text/plain, Size: 728 bytes --]
On 14/12/2019 17:39, Jens Axboe wrote:
> On 12/14/19 7:31 AM, Pavel Begunkov wrote:
>> There is no reliable way to submit and wait in a single syscall, as
>> io_submit_sqes() may under-consume sqes (in case of an early error).
>> Then it will wait for not-yet-submitted requests, deadlocking the user
>> in most cases.
>>
>> Don't wait/poll if can't submit all sqes, and return -EAGAIN
>>
>> Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
>> ---
>>
>> v2: cap min_complete if submitted partially (Jens Axboe)
>
> Can you update the commit message as well, doesn't really reflect the
> current state of it... Apart from that, looks good to me!
>
Right, thanks for noticing!
--
Pavel Begunkov
[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 833 bytes --]
next prev parent reply other threads:[~2019-12-14 14:44 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-13 7:51 [PATCH 1/1] io_uring: don't wait when under-submitting Pavel Begunkov
2019-12-13 18:22 ` Jens Axboe
2019-12-13 18:32 ` Jens Axboe
2019-12-13 21:32 ` Pavel Begunkov
2019-12-13 21:48 ` Jens Axboe
2019-12-14 14:31 ` [PATCH v2] " Pavel Begunkov
2019-12-14 14:39 ` Jens Axboe
2019-12-14 14:44 ` Pavel Begunkov [this message]
2019-12-14 14:53 ` [PATCH v3] " Pavel Begunkov
2019-12-14 18:43 ` Jens Axboe
2019-12-15 5:42 ` Jens Axboe
2019-12-15 15:48 ` Pavel Begunkov
2019-12-15 21:33 ` Jens Axboe
2019-12-16 16:31 ` [PATCH v4] " Pavel Begunkov
2019-12-16 16:47 ` [PATCH v3] " Pavel Begunkov
2019-12-16 16:51 ` Jens Axboe
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=28db945c-080f-1951-b4ff-b315f2d0be68@gmail.com \
--to=asml.silence@gmail.com \
--cc=axboe@kernel.dk \
--cc=io-uring@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).