Re: [PATCH RFC] fsio: filesystem io accounting cgroup

[Tejun Heo]

Hello, Vivek.

On Mon, Jul 08, 2013 at 01:52:01PM -0400, Vivek Goyal wrote:
> > Again, a problem to be fixed in the stack rather than patching up from
> > up above.  The right thing to do is to propagate pressure through bdi
> > properly and let whatever is backing the bdi generate appropriate
> > amount of pressure, be that disk or network.
> 
> Ok, so use network controller for controlling IO rate on NFS? I had
> tried it once and it did not work. I think it had problems related
> to losing the context info as IO propagated through the stack. So
> we will have to fix that too.

But that's a similar problem we have with blkcg anyway - losing the
dirtier information by the time writeback comes down through bdi.  It
might not be exactly the same and might need some impedance matching
on the network side but I don't see any fundamental differences.

Thanks.

-- 
tejun
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