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>
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 061dee6..a29f092 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -1009,14 +1009,8 @@
/*
* 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;
}