Re: [Lsf-pc] [LSF/MM ATTEND] Filesystems -- Btrfs, cgroups, Storage topics from Facebook

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Hey, again.

On Thu, Jan 02, 2014 at 11:01:02AM -0500, tj@xxxxxxxxxx wrote:
> What we're missing is a way to make such split visible in the upper
> layers for writeback.  It seems rather clear to me that that's the
> right way to approach the problem rather than implementing separate
> control for writebacks and somehow coordinate that with the rest.

To clarify a bit.  I think what we need to do is splitting bdi's for
each active blkcg (at least the part which is relevant to propagating
io pressure upwards).  I really don't think a scheme where we try to
somehow split bandwidth number between two separate enforcing
mechanisms is something we should go after.

Thanks.

-- 
tejun
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