Re: [RFC] writeback and cgroup

[Vivek Goyal]

On Fri, Apr 20, 2012 at 02:33:01PM -0700, Tejun Heo wrote:
> On Fri, Apr 20, 2012 at 03:29:30PM -0400, Vivek Goyal wrote:
> > I am personally is not too excited about the case of putting async IO
> > in separate groups due to the reason that async IO of one group will
> > start impacting latencies of sync IO of another group and in practice
> > it might not be desirable. But there are others who have use cases for
> > separate async IO queue. So as long as switch is there to change the
> > behavior, I am not too worried.
> 
> Why not just fix cfq so that it prefers groups w/ sync IOs?

Yes that could possibly be done but now that's change of requirements. Now
we are saying that I want one buffered write to go faster than other
buffered write only if there is no sync IO present in any of the groups.

Thanks
Vivek
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