From: Corrado Zoccolo <czoccolo@gmail.com>
Date: Sun, 28 Feb 2010 18:45:05 +0000 (+0100)
Subject: cfq-iosched: requests "in flight" vs "in driver" clarification
X-Git-Tag: v2.6.34-rc1~242^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=53c583d2269851de9df1c2e992cb2f7f124a5f55;p=pandora-kernel.git

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>
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