From: Andrew Morton <akpm@linux-foundation.org>
To: Jens Axboe <jens.axboe@oracle.com>
Cc: Arjan van de Ven <arjan@infradead.org>,
linux-kernel@vger.kernel.org, Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: [PATCH] Give kjournald a IOPRIO_CLASS_RT io priority
Date: Thu, 2 Oct 2008 01:03:15 -0700 [thread overview]
Message-ID: <20081002010315.1cda8147.akpm@linux-foundation.org> (raw)
In-Reply-To: <20081002074523.GW19428@kernel.dk>
On Thu, 2 Oct 2008 09:45:24 +0200 Jens Axboe <jens.axboe@oracle.com> wrote:
> > So. Where are these atime updaters getting blocked?
>
> Behind other IO activity I suppose, since it's marked async. A more
> appropriate fix may be to mark atime updates as sync IO.
No, they might be getting blocked at a higher level.
An async atime update gets recorded into the current transaction.
kjournald is working on the committing transaction. We try to keep
those separated, to prevent user processes from getting blocked behind
kjournald activity.
But sometimes that doesn't work (including the place where I knowingly
broke it). If we can find and fix the offending piece of jbd logic (a
big if) then all is peachy.
If the above theory turns out to be true then diddling IO priorities
is but a workaround.
next prev parent reply other threads:[~2008-10-02 8:03 UTC|newest]
Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-02 3:00 [PATCH] Give kjournald a IOPRIO_CLASS_RT io priority Arjan van de Ven
2008-10-02 4:56 ` Andrew Morton
2008-10-02 6:27 ` Jens Axboe
2008-10-02 6:55 ` Andrew Morton
2008-10-02 7:45 ` Jens Axboe
2008-10-02 8:03 ` Andrew Morton [this message]
2008-10-02 8:22 ` Jens Axboe
2008-10-02 8:43 ` Andrew Morton
2008-10-02 8:46 ` Jens Axboe
2008-10-02 12:04 ` Theodore Tso
2008-10-02 13:16 ` Arjan van de Ven
2008-10-02 13:46 ` Theodore Tso
2008-10-02 14:33 ` Arjan van de Ven
2008-10-04 14:12 ` Theodore Tso
2008-10-04 17:14 ` Joseph Fannin
2008-10-04 21:27 ` Theodore Tso
2008-10-02 13:12 ` Arjan van de Ven
2008-10-02 20:24 ` Andrew Morton
2008-10-03 4:01 ` Arjan van de Ven
2008-10-03 4:23 ` Arjan van de Ven
2008-10-03 4:40 ` Andrew Morton
2008-10-03 4:43 ` Arjan van de Ven
2008-10-03 4:50 ` Andrew Morton
2008-10-03 5:00 ` Arjan van de Ven
2008-10-03 5:24 ` Andrew Morton
2008-10-03 17:21 ` Arjan van de Ven
2008-10-09 3:00 ` Theodore Tso
2008-10-09 3:38 ` Andrew Morton
2008-10-03 4:45 ` Arjan van de Ven
2008-10-02 6:57 ` Andi Kleen
2008-10-02 7:55 ` Jens Axboe
2008-10-02 9:33 ` Dave Chinner
2008-10-02 9:45 ` Jens Axboe
2008-10-02 13:14 ` Arjan van de Ven
2008-10-02 13:27 ` Jens Axboe
2008-10-02 13:36 ` Arjan van de Ven
2008-10-02 13:47 ` Jens Axboe
2008-10-02 14:26 ` Arjan van de Ven
2008-10-02 16:42 ` Jens Axboe
2008-10-02 19:04 ` Arjan van de Ven
2008-10-02 19:22 ` Jens Axboe
2008-10-02 21:37 ` Andrew Morton
2008-10-02 23:58 ` Dave Chinner
2008-10-03 0:06 ` Andrew Morton
2008-10-03 0:20 ` Andrew Morton
2008-10-02 13:05 ` Arjan van de Ven
2008-10-02 17:11 ` Jens Axboe
[not found] <bimJN-4cO-5@gated-at.bofh.it>
[not found] ` <biosl-6bq-9@gated-at.bofh.it>
[not found] ` <biqkw-aK-3@gated-at.bofh.it>
[not found] ` <birgx-1pQ-9@gated-at.bofh.it>
[not found] ` <bisPe-3xx-9@gated-at.bofh.it>
[not found] ` <bisYW-3HQ-13@gated-at.bofh.it>
2008-10-02 15:32 ` Bodo Eggert
2008-10-02 23:34 ` Dave Chinner
2008-10-04 7:45 ` Aaron Carroll
2008-10-06 3:18 ` Dave Chinner
2008-10-07 18:06 ` Jens Axboe
2008-10-07 22:22 ` Dave Chinner
2008-10-09 8:48 ` Jens Axboe
-- strict thread matches above, loose matches on Subject: below --
2007-10-15 17:46 [patch] " Arjan van de Ven
2007-10-15 18:47 ` Andrew Morton
2007-10-15 19:28 ` Jens Axboe
2007-10-22 9:10 ` Ingo Molnar
2007-10-22 9:23 ` Andrew Morton
2007-10-22 9:27 ` Ingo Molnar
2007-10-22 9:40 ` Ingo Molnar
2007-10-22 9:49 ` Andrew Morton
2007-10-15 20:13 ` Rik van Riel
2007-10-15 21:12 ` Andrew Morton
[not found] ` <473B18BA.5000709@hp.com>
2007-11-14 17:14 ` Andrew Morton
2007-11-14 17:18 ` Ingo Molnar
2007-11-14 17:51 ` Arjan van de Ven
2007-11-14 18:55 ` Ingo Molnar
2007-11-14 19:43 ` Alan D. Brunelle
2007-11-14 19:24 ` Alan D. Brunelle
2007-11-14 19:50 ` Arjan van de Ven
2007-11-14 19:56 ` Alan D. Brunelle
2007-11-16 16:25 ` Alan D. Brunelle
2007-11-16 16:40 ` Alan D. Brunelle
2007-11-16 18:35 ` Ray Lee
2007-11-16 18:39 ` Alan D. Brunelle
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=20081002010315.1cda8147.akpm@linux-foundation.org \
--to=akpm@linux-foundation.org \
--cc=alan@lxorguk.ukuu.org.uk \
--cc=arjan@infradead.org \
--cc=jens.axboe@oracle.com \
--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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.