From: Mike Snitzer <snitzer@redhat.com>
To: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Mandeep Singh Baines <msb@chromium.org>,
linux-kernel@vger.kernel.org, jrbarnette@chromium.org,
Neil Brown <neilb@suse.de>, Jens Axboe <jaxboe@fusionio.com>,
Alasdair G Kergon <agk@redhat.com>,
dm-devel@redhat.com
Subject: Re: dm: pass up rotational flag
Date: Thu, 26 May 2011 14:43:21 -0400 [thread overview]
Message-ID: <20110526184321.GC26219@redhat.com> (raw)
In-Reply-To: <yq1zkm948oa.fsf@sermon.lab.mkp.net>
On Thu, May 26 2011 at 2:29pm -0400,
Martin K. Petersen <martin.petersen@oracle.com> wrote:
> >>>>> "Mike" == Mike Snitzer <snitzer@redhat.com> writes:
>
> >> Allow the NONROT flag to be passed through to linear mappings if all
> >> underlying device are non-rotational. Tools like ureadahead will
> >> schedule IOs differently based on the rotational flag.
>
> Mike> Thanks for doing this, looks good in general.
>
> I'd rather we made the rotational property part of the topology instead
> of having to special-case it in DM. I seem to recall posting a patch
> that did that at some point but I can't seem to find it...
Sure, that'd work too.
Similarly, couldn't the discard flag be made part of topology?
Mike
next prev parent reply other threads:[~2011-05-26 18:43 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-25 20:50 [PATCH] dm: pass up rotational flag Mandeep Singh Baines
2011-05-26 18:23 ` Mike Snitzer
2011-05-26 18:29 ` Martin K. Petersen
2011-05-26 18:43 ` Mike Snitzer [this message]
2011-05-26 18:48 ` Martin K. Petersen
2011-05-26 19:14 ` Jens Axboe
2011-05-27 2:42 ` Martin K. Petersen
2011-05-27 2:42 ` [PATCH 1/3] block: Introduce blk_set_stacking_limits function Martin K. Petersen
2011-05-27 13:03 ` Mike Snitzer
2011-05-27 2:42 ` [PATCH 2/3] block: Move non-rotational flag to queue limits Martin K. Petersen
2011-05-27 13:02 ` Mike Snitzer
2011-05-31 2:19 ` Martin K. Petersen
2011-05-31 12:49 ` Mike Snitzer
2011-05-31 13:14 ` Jens Axboe
2011-05-31 14:28 ` Martin K. Petersen
2011-05-31 14:28 ` Martin K. Petersen
2011-05-31 14:43 ` Jens Axboe
2011-05-27 2:42 ` [PATCH 3/3] block: Move discard and secure discard flags " Martin K. Petersen
2011-05-27 13:39 ` Mike Snitzer
2011-05-31 2:22 ` Martin K. Petersen
2011-07-13 15:46 ` Mike Snitzer
2011-05-27 16:20 ` Mandeep Singh Baines
2011-05-26 18:35 ` [PATCH v2] dm: pass up non-rotational flag Mike Snitzer
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