[PATCH 25/23] io-controller: fix queue vs group fairness

[Rik van Riel]

Vivek Goyal wrote:
> o I found an issue during test and that is if there is a mix of queue and group
>   at same level, there can be fairness issue. For example, consider following
>   case.

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

(assuming the cleanups are done in V10 - the artifact of
  a wraparound hitting exactly 0 should not be an issue)

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