Re: [dm-devel] [PATCH v3 14/16] Gut bio_add_page()

[Tejun Heo <tj kernel org>]

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