From: Jan Kara <jack@suse.cz>
To: Theodore Ts'o <tytso@mit.edu>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Chris Friesen <chris.friesen@windriver.com>,
Austin Schuh <austin@peloton-tech.com>,
pavel@pavlinux.ru, "J. Bruce Fields" <bfields@fieldses.org>,
linux-ext4@vger.kernel.org, adilger.kernel@dilger.ca,
rt-users <linux-rt-users@vger.kernel.org>
Subject: Re: RT/ext4/jbd2 circular dependency
Date: Thu, 13 Nov 2014 20:06:44 +0100 [thread overview]
Message-ID: <20141113190644.GA12075@quack.suse.cz> (raw)
In-Reply-To: <20141030232437.GF31927@thunk.org>
On Thu 30-10-14 19:24:37, Ted Tso wrote:
> On Thu, Oct 30, 2014 at 10:11:26PM +0100, Thomas Gleixner wrote:
> >
> > That's a way better explanation than what I saw in the commit logs and
> > it actually maps to the observed traces and stackdumps.
>
> I can't speak for Jan, but I suspect he didn't realize that there was
> a problem. The commit description in b34090e5e2 makes it clear that
> the intent was a performance improvement, and not an attempt to fix a
> potential deadlock bug.
Yeah, correct. When I wrote b34090e5e2 I did that because I have realized
that journal reservations would create similar deadlock opportunity as
Chris has observed. I hadn't realized the problem is already in the code :)
Honza
--
Jan Kara <jack@suse.cz>
SUSE Labs, CR
next prev parent reply other threads:[~2014-11-13 19:06 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-17 17:50 Hang writing to nfs-mounted filesystem from client, all nfsd tasks on server blocked in D Chris Friesen
2014-10-17 18:01 ` Pavel Vasilyev
[not found] ` <CANGgnMbQmsdMDJUx7Bop9Xs=jQMmAJgWRjhXVFUGx-DwF=inYw@mail.gmail.com>
2014-10-23 17:54 ` RT/ext4/jbd2 circular dependency (was: Re: Hang writing to nfs-mounted filesystem from client) Chris Friesen
2014-10-26 14:25 ` Thomas Gleixner
2014-10-27 16:22 ` RT/ext4/jbd2 circular dependency Chris Friesen
2014-10-29 18:05 ` Thomas Gleixner
2014-10-29 19:11 ` Chris Friesen
2014-10-29 19:26 ` Thomas Gleixner
2014-10-29 20:17 ` Chris Friesen
2014-10-29 20:31 ` Thomas Gleixner
2014-10-29 23:19 ` Theodore Ts'o
2014-10-29 23:37 ` Chris Friesen
2014-10-30 1:44 ` Theodore Ts'o
2014-10-30 8:15 ` Kevin Liao
2014-10-30 12:24 ` Theodore Ts'o
2014-10-30 21:11 ` Thomas Gleixner
2014-10-30 23:24 ` Theodore Ts'o
2014-10-31 0:08 ` Chris Friesen
2014-10-31 0:16 ` Thomas Gleixner
2014-11-13 19:06 ` Jan Kara [this message]
2014-10-27 19:57 ` Chris Friesen
[not found] ` <544156FE.7070905-CWA4WttNNZF54TAoqtyWWQ@public.gmane.org>
2014-10-17 18:58 ` Hang writing to nfs-mounted filesystem from client, all nfsd tasks on server blocked in D Austin Schuh
2014-10-17 19:12 ` Dmitry Monakhov
2014-10-18 17:05 ` Hang writing to nfs-mounted filesystem from client -- expected code path? Chris Friesen
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=20141113190644.GA12075@quack.suse.cz \
--to=jack@suse.cz \
--cc=adilger.kernel@dilger.ca \
--cc=austin@peloton-tech.com \
--cc=bfields@fieldses.org \
--cc=chris.friesen@windriver.com \
--cc=linux-ext4@vger.kernel.org \
--cc=linux-rt-users@vger.kernel.org \
--cc=pavel@pavlinux.ru \
--cc=tglx@linutronix.de \
--cc=tytso@mit.edu \
/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).