public inbox for [email protected]
 help / color / mirror / Atom feed
From: Jens Axboe <[email protected]>
To: Pavel Begunkov <[email protected]>,
	[email protected], [email protected]
Subject: Re: [PATCH v3] io_uring: don't wait when under-submitting
Date: Sat, 14 Dec 2019 11:43:37 -0700	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <c6f625bdb27ea3b929d0717ebf2aaa33ad5410da.1576335142.git.asml.silence@gmail.com>

On 12/14/19 7:53 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.
> 
> In such cases adjust min_complete, so it won't wait for more than
> what have been submitted in the current call to io_uring_enter(). It
> may be less than totally in-flight including previous submissions,
> but this shouldn't do harm and up to a user.

Thanks, applied.

-- 
Jens Axboe


  reply	other threads:[~2019-12-14 18:43 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
2019-12-14 14:53   ` [PATCH v3] " Pavel Begunkov
2019-12-14 18:43     ` Jens Axboe [this message]
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 \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    /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