[Devel] [PATCH] cfq: async queue allocation per priority

[Vasily Tarasov]

Jens, I think the last patch, that makes queues allocation per priority,
has a problem.

If we have two processes with different ioprio_class, but the same
ioprio_data, their async requests will fall into the same queue. I guess
such behavior is not expected, because it's not right to put real-time
requests and best-effort requests in the same queue.

The attached patch fixes the problem by introducing additional *cfqq
fields on cfqd, pointing to per-(class,priority) async queues.


Thanks,
Vasily

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