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blk-throttle: process limit change only through one function

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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>
This commit is contained in:
Vivek Goyal 2011-03-07 21:05:14 +01:00 committed by Jens Axboe
parent b873c5d692
commit 231d704b4a
1 changed files with 1 additions and 7 deletions
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8
block/blk-throttle.c
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@ -1009,14 +1009,8 @@ int blk_throtl_bio(struct request_queue *q, struct bio **biop)
/*
* There is already another bio queued in same dir. No
* need to update dispatch time.
* Still update the disptime if rate limits on this group
* were changed.
*/
if (!tg->limits_changed)
update_disptime = false;
else
tg->limits_changed = false;
update_disptime = false;
goto queue_bio;
}