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    SubjectRe: [PATCH 14/23] io-conroller: Prepare elevator layer for single queue schedulers
    Vivek Goyal wrote:
    > Elevator layer now has support for hierarchical fair queuing. cfq has
    > been migrated to make use of it and now it is time to do groundwork for
    > noop, deadline and AS.
    > noop deadline and AS don't maintain separate queues for different processes.
    > There is only one single queue. Effectively one can think that in hierarchical
    > setup, there will be one queue per cgroup where requests from all the
    > processes in the cgroup will be queued.
    > Generally io scheduler takes care of creating queues. Because there is
    > only one queue here, we have modified common layer to take care of queue
    > creation and some other functionality. This special casing helps in keeping
    > the changes to noop, deadline and AS to the minimum.
    > Signed-off-by: Nauman Rafique <>
    > Signed-off-by: Gui Jianfeng <>
    > Signed-off-by: Vivek Goyal <>

    Acked-by: Rik van Riel <>

    All rights reversed.

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