[PATCH 14/23] io-conroller: Prepare elevator layer for single queue schedulers

Rik van Riel riel at redhat.com
Sun Aug 30 19:49:08 PDT 2009


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 at google.com>
> Signed-off-by: Gui Jianfeng <guijianfeng at cn.fujitsu.com>
> Signed-off-by: Vivek Goyal <vgoyal at redhat.com>

Acked-by: Rik van Riel <riel at redhat.com>

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