From: Shaohua Li <shaohua.li@intel.com>
Date: Fri, 4 Dec 2009 12:12:06 +0000 (+0100)
Subject: cfq-iosched: make nonrot check logic consistent
X-Git-Tag: v2.6.33-rc1~379^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3c764b7a654668dd04905841d6024f7b6aa843a5;p=pandora-kernel.git

cfq-iosched: make nonrot check logic consistent

cfq_arm_slice_timer() has logic to disable idle window for SSD device. The same
thing should be done at cfq_select_queue() too, otherwise we will still see
idle window. This makes the nonrot check logic consistent in cfq.
Tests in a intel SSD with low_latency knob close, below patch can triple disk
thoughput for muti-thread sequential read.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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