Re: [Xen-devel] [PATCH 03 of 11 v3] xen: sched_credit: when picking, make sure we get an idle one, if any

[George Dunlap <george.dunlap@xxxxxxxxxxxxx>]

On 01/02/13 11:01, Dario Faggioli wrote:
> The pcpu picking algorithm treats two threads of a SMT core the same.
> More specifically, if one is idle and the other one is busy, they both
> will be assigned a weight of 1. Therefore, when picking begins, if the
> first target pcpu is the busy thread (and if there are no other idle
> pcpu than its sibling), that will never change.
>
> This change fixes this by ensuring that, before entering the core of
> the picking algorithm, the target pcpu is an idle one (if there is an
> idle pcpu at all, of course).
>
> Signed-off-by: Dario Faggioli <dario.faggioli@xxxxxxxxxx>
Acked-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>


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