From: Jens Axboe <axboe@kernel.dk>
To: Tejun Heo <tj@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Vivek Goyal <vgoyal@redhat.com>,
Shaohua Li <vivek.goyal2008@gmail.com>,
lkml <linux-kernel@vger.kernel.org>,
Knut Petersen <Knut_Petersen@t-online.de>,
mroos@linux.ee
Subject: Re: [patch]block: fix ioc locking warning
Date: Mon, 06 Feb 2012 21:16:06 +0100 [thread overview]
Message-ID: <4F303506.9000201@kernel.dk> (raw)
In-Reply-To: <20120206172706.GB21292@google.com>
On 2012-02-06 18:27, Tejun Heo wrote:
> Hello,
>
> On Mon, Feb 06, 2012 at 08:58:49AM -0800, Linus Torvalds wrote:
>> On Mon, Feb 6, 2012 at 8:44 AM, Tejun Heo <tj@kernel.org> wrote:
>>>
>>> Yeah, this seems better to me. Jens, if you're gonna amend the
>>> commit, please consider collapsing the following patch into the
>>> original patch too. Thanks.
>>
>> Guys, is it *really* worth it to do all these crazy games?
>>
>> How bad is it to just always use the async freeing, instead of this
>> clearly very fragile crazy direct-freeing-with-serious-locking-issues
>> thing?
>
> It's one wq scheduling on exit for any task which has issued an IO. I
> don't think it would matter except for task fork/exit microbenchs (or
> workloads which approximate to that). I'll get some measurements and
> strip the optimization if it doesn't really show up.
One (arguably stupid) thing that some users do do is something like:
$ find . -exec grep foo '{}' \;
So that would probably be a good pathological test case for this.
--
Jens Axboe
next prev parent reply other threads:[~2012-02-06 20:16 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-06 7:50 [patch]block: fix ioc locking warning Shaohua Li
2012-02-06 7:55 ` Jens Axboe
2012-02-06 15:12 ` Vivek Goyal
2012-02-06 16:09 ` Jens Axboe
2012-02-06 16:37 ` Vivek Goyal
2012-02-06 16:44 ` Tejun Heo
2012-02-06 16:58 ` Linus Torvalds
2012-02-06 17:27 ` Tejun Heo
2012-02-06 20:16 ` Jens Axboe [this message]
2012-02-06 21:54 ` [PATCH] block: strip out locking optimization in put_io_context() Tejun Heo
2012-02-07 6:49 ` Jens Axboe
2012-02-07 16:22 ` Tejun Heo
2012-02-07 16:28 ` Jens Axboe
2012-02-07 16:33 ` Linus Torvalds
2012-02-07 16:47 ` Tejun Heo
2012-02-07 17:17 ` Tejun Heo
2012-02-08 0:19 ` Shaohua Li
2012-02-08 8:29 ` Shaohua Li
2012-02-08 16:29 ` Tejun Heo
2012-02-08 16:34 ` Linus Torvalds
2012-02-08 16:49 ` Tejun Heo
2012-02-08 16:56 ` Tejun Heo
2012-02-08 17:23 ` Tejun Heo
2012-02-09 6:22 ` Shaohua Li
2012-02-09 17:59 ` Tejun Heo
2012-02-09 18:07 ` Linus Torvalds
2012-02-09 19:24 ` Tejun Heo
2012-02-09 23:48 ` Tejun Heo
2012-02-10 5:14 ` Shaohua Li
2012-02-10 8:48 ` Shaohua Li
2012-02-11 2:17 ` Tejun Heo
2012-02-11 11:35 ` Jens Axboe
2012-02-13 1:34 ` Shaohua Li
2012-02-13 20:49 ` Tejun Heo
2012-02-14 2:36 ` Shaohua Li
2012-02-14 16:39 ` Tejun Heo
2012-02-10 3:09 ` Shaohua Li
2012-02-07 23:00 ` [PATCH] block: fix lockdep warning on io_context release put_io_context() Tejun Heo
2012-02-06 20:36 ` [patch]block: fix ioc locking warning Tejun Heo
2012-02-07 0:31 ` Shaohua Li
2012-02-07 0:39 ` Tejun Heo
2012-02-07 0:43 ` Shaohua Li
2012-02-07 0:59 ` Tejun Heo
2012-02-07 1:10 ` Shaohua Li
2012-02-07 1:33 ` Shaohua Li
2012-02-07 5:22 ` Shaohua Li
2012-02-07 22:34 ` Linus Torvalds
2012-02-06 16:22 ` Tejun Heo
2012-02-08 18:07 ` walt
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=4F303506.9000201@kernel.dk \
--to=axboe@kernel.dk \
--cc=Knut_Petersen@t-online.de \
--cc=linux-kernel@vger.kernel.org \
--cc=mroos@linux.ee \
--cc=tj@kernel.org \
--cc=torvalds@linux-foundation.org \
--cc=vgoyal@redhat.com \
--cc=vivek.goyal2008@gmail.com \
/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).