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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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@ -1009,14 +1009,8 @@ int blk_throtl_bio(struct request_queue *q, struct bio **biop)
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/*
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* There is already another bio queued in same dir. No
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* need to update dispatch time.
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* Still update the disptime if rate limits on this group
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* were changed.
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*/
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if (!tg->limits_changed)
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update_disptime = false;
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else
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tg->limits_changed = false;
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update_disptime = false;
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goto queue_bio;
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}
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