linux-kernel - Re: dm: pass up rotational flag

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Date:	Thu, 26 May 2011 21:14:17 +0200
From:	Jens Axboe <jaxboe@...ionio.com>
To:	"Martin K. Petersen" <martin.petersen@...cle.com>
CC:	Mike Snitzer <snitzer@...hat.com>,
	Mandeep Singh Baines <msb@...omium.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"jrbarnette@...omium.org" <jrbarnette@...omium.org>,
	Neil Brown <neilb@...e.de>, Alasdair G Kergon <agk@...hat.com>,
	"dm-devel@...hat.com" <dm-devel@...hat.com>
Subject: Re: dm: pass up rotational flag

On 2011-05-26 20:29, Martin K. Petersen wrote:
>>>>>> "Mike" == Mike Snitzer <snitzer@...hat.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...

Agree, would be a better idea.

-- 
Jens Axboe

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