Re: [PATCH 14/23] io-conroller: Prepare elevator layer for singlequeue schedulers

[Rik van Riel]

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 <nauman@xxxxxxxxxx>
> Signed-off-by: Gui Jianfeng <guijianfeng@xxxxxxxxxxxxxx>
> Signed-off-by: Vivek Goyal <vgoyal@xxxxxxxxxx>

Acked-by: Rik van Riel <riel@xxxxxxxxxx>

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