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    Subject[RFC] IO Controller

    Hi All,

    Here is another posting for IO controller patches. Last time I had posted
    RFC patches for an IO controller which did bio control per cgroup.

    One of the takeaway from the discussion in this thread was that let us
    implement a common layer which contains the proportional weight scheduling
    code which can be shared by all the IO schedulers.

    Implementing IO controller will not cover the devices which don't use
    IO schedulers but it should cover the common case.

    There were more discussions regarding 2 level vs 1 level IO control at
    following link.

    So in the mean time we took the discussion off the list and spent time on
    making the 1 level control apporoach work where majority of the proportional
    weight control is shared by the four schedulers instead of each one having
    to replicate the code. We make use of BFQ code for fair queuing as posted
    by Paolo and Fabio here.

    Details about design and howto have been put in documentation patch.

    I have done very basic testing of running 2 or 3 "dd" threads in different
    cgroups. Wanted to get the patchset out for feedback/review before we dive
    into more bug fixing, benchmarking, optimizations etc.

    Your feedback/comments are welcome.

    Patch series contains 10 patches. It should be compilable and bootable after
    every patch. Intial 2 patches implement flat fair queuing (no cgroup
    support) and make cfq to use that. Later patches introduce hierarchical
    fair queuing support in elevator layer and modify other IO schdulers to use


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