linux-kernel - Re: [PATCH v3 14/16] Gut bio_add

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Date:	Tue, 29 May 2012 11:15:58 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Dave Chinner <david@...morbit.com>
Cc:	Mikulas Patocka <mpatocka@...hat.com>,
	Alasdair G Kergon <agk@...hat.com>,
	Kent Overstreet <koverstreet@...gle.com>,
	Mike Snitzer <snitzer@...hat.com>,
	linux-kernel@...r.kernel.org, linux-bcache@...r.kernel.org,
	dm-devel@...hat.com, linux-fsdevel@...r.kernel.org,
	axboe@...nel.dk, yehuda@...newdream.net, vgoyal@...hat.com,
	bharrosh@...asas.com, sage@...dream.net, drbd-dev@...ts.linbit.com,
	Dave Chinner <dchinner@...hat.com>, tytso@...gle.com,
	"Martin K. Petersen" <martin.petersen@...cle.com>
Subject: Re: [PATCH v3 14/16] Gut bio_add_page()

Hello,

On Tue, May 29, 2012 at 12:08:15PM +1000, Dave Chinner wrote:
> > i thought a bit more about it and the only thing which makes sense to
> > me is exposing the stripe granularity for striped devices -
> > ie. something which says "if you go across this boundary, the
> > performance characteristics including latency might get affected",
> > which should fit nicely with the rest of topology information.
> > Martin, adding that shouldn't be difficult, right?
> 
> We already have the optimal IO size/alignment field in the topology.
> Doesn't this fit what you want exactly?

I don't know how xfs/ext4 is currently benefiting from
merge_bvec_fn(), so I'm unsure.  If the existing ones are enough,
great.

Thanks.

-- 
tejun
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