On 09/24/2012 07:24 PM, Peter Zijlstra wrote:
On Mon, 2012-09-24 at 18:59 +0530, Raghavendra K T wrote:
However Rik had a genuine concern in the cases where runqueue is not
equally distributed and lockholder might actually be on a different run
queue but not running.
Load should eventually get distributed equally -- that's what the
load-balancer is for -- so this is a temporary situation.
We already try and favour the non running vcpu in this case, that's what
yield_to_task_fair() is about. If its still not eligible to run, tough
luck.
Yes, I agree.
Do you think instead of using rq->nr_running, we could get a global
sense of load using avenrun (something like avenrun/num_onlinecpus)
To what purpose? Also, global stuff is expensive, so you should try and
stay away from it as hard as you possibly can.
Yes, that concern only had made me to fall back to rq->nr_running.
Will come back with the result soon.
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