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Re: [Xen-devel] [PATCH] xen: sched: Credit2: during scheduling, update the idle mask before using it

On Thu, 2018-10-11 at 15:44 +0200, Dario Faggioli wrote:
> Load balancing, when happening, at the end of a "scheduler epoch",
> can
> trigger vcpu migration, which in its turn may call runq_tickle(). If
> the
> cpu where this happens was idle, but we're now going to schedule a
> vcpu
> on it, let's update the runq's idle cpus mask accordingly _before_
> doing
> load balancing.
> Not doing that, in fact, may cause runq_tickle() to think that the
> cpu
> is still idle, and tickle it to go pick up a vcpu from the runqueue,
> which might be wrong/unideal.
> Signed-off-by: Dario Faggioli <dfaggioli@xxxxxxxx>
> ---
> Cc: George Dunlap <george.dunlap@xxxxxxxxxx>

Thanks and Regards,
<<This happens because I choose it to happen!>> (Raistlin Majere)
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Software Engineer @ SUSE https://www.suse.com/

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