From: Vivek Goyal <vgoyal@redhat.com>
Date: Mon, 7 Mar 2011 20:05:14 +0000 (+0100)
Subject: blk-throttle: process limit change only through one function
X-Git-Tag: v2.6.39-rc1~80^2~40
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=231d704b4ab7491473c0b1a9cd0c6e0d1cba85b9;p=pandora-kernel.git

blk-throttle: process limit change only through one function

With the help of cgroup interface one can go and upate the bps/iops
limits of existing group. Once the limits are udpated, a thread is
woken up to see if some blocked group needs recalculation based on new
limits and needs to be requeued.

There was also a piece of code where I was checking for group limit
update when a fresh bio comes in. This patch gets rid of that piece of
code and keeps processing the limit change at one place
throtl_process_limit_change().  It just keeps the code simple and easy
to understand.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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