From: Tejun Heo <tj@kernel.org>
To: Jens Axboe <jaxboe@fusionio.com>
Cc: Jeff Moyer <jmoyer@redhat.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Zach Brown <zab@redhat.com>, Peter Zijlstra <pzijlstr@redhat.com>,
Ingo <mingo@redhat.com>
Subject: Re: [patch,v2] bdi: add a user-tunable cpu_list for the bdi flusher threads
Date: Thu, 6 Dec 2012 10:22:39 -0800 [thread overview]
Message-ID: <20121206182239.GS19802@htj.dyndns.org> (raw)
In-Reply-To: <50C0E1B6.5060602@fusionio.com>
Hello, Jens.
On Thu, Dec 06, 2012 at 07:19:34PM +0100, Jens Axboe wrote:
> We need to expose it. Once the binding is set from the kernel side on a
> kernel thread, it can't be modified.
That's only if kthread_bind() is used. Caling set_cpus_allowed_ptr()
doesn't set PF_THREAD_BOUND and userland can adjust affinity like any
other tasks.
> Binding either for performance reasons or for ensuring that we
> explicitly don't run in some places is a very useful feature.
Sure, but I think this is too specific. Something more generic would
be much better. It can be as simple as generating a uevent.
Thanks.
--
tejun
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2012-12-06 18:22 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-03 18:53 [patch,v2] bdi: add a user-tunable cpu_list for the bdi flusher threads Jeff Moyer
2012-12-04 2:34 ` Dave Chinner
2012-12-04 14:42 ` Jeff Moyer
2012-12-04 20:35 ` Dave Chinner
2012-12-04 20:14 ` Jens Axboe
2012-12-04 20:23 ` Jeff Moyer
2012-12-04 20:27 ` Jens Axboe
2012-12-04 22:26 ` Jeff Moyer
2012-12-05 7:43 ` Jens Axboe
2012-12-06 18:01 ` Tejun Heo
2012-12-06 18:08 ` Jeff Moyer
2012-12-06 18:13 ` Tejun Heo
2012-12-06 18:19 ` Jens Axboe
2012-12-06 18:22 ` Tejun Heo [this message]
2012-12-06 18:33 ` Jeff Moyer
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=20121206182239.GS19802@htj.dyndns.org \
--to=tj@kernel.org \
--cc=jaxboe@fusionio.com \
--cc=jmoyer@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mingo@redhat.com \
--cc=pzijlstr@redhat.com \
--cc=zab@redhat.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).