tree 993a4f67663b4457771b7069513ad6e0471223b3
parent 87c3a922a7ee8cfb9ab837f4ae38c993e9b30711
author Corrado Zoccolo <czoccolo@gmail.com> 1267382705 +0100
committer Jens Axboe <jens.axboe@oracle.com> 1267382705 +0100

cfq-iosched: requests "in flight" vs "in driver" clarification

Counters for requests "in flight" and "in driver" are used asymmetrically
in cfq_may_dispatch, and have slightly different meaning.
We split the rq_in_flight counter (was sync_flight) to count both sync
and async requests, in order to use this one, which is more accurate in
some corner cases.
The rq_in_driver counter is coalesced, since individual sync/async counts
are not used any more.

Signed-off-by: Corrado Zoccolo <czoccolo@gmail.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>