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    SubjectRe: [RFC] writeback and cgroup
    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?

    There may be a sync+async group in front, but when switch into it, it
    decides to give its async queue a run. That's not necessarily a bad
    decision, but we do lose some control here.


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