Re: [Xen-devel] [PATCH v2] xen/sched: fix credit2 smt idle handling

[Dario Faggioli <dfaggioli@xxxxxxxx>]

On Thu, 2019-03-28 at 16:46 +0100, Juergen Gross wrote:
> Credit2's smt_idle_mask_set() and smt_idle_mask_clear() are used to
> identify idle cores where vcpus can be moved to. A core is thought to
> be idle when all siblings are known to have the idle vcpu running on
> them.
> 
> Unfortunately the information of a vcpu running on a cpu is per
> runqueue. So in case not all siblings are in the same runqueue a core
> will never be regarded to be idle, as the sibling not in the runqueue
> is never known to run the idle vcpu.
> 
> Use a credit2 specific cpumask of siblings with only those cpus
> being marked which are in the same runqueue as the cpu in question.
> 
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
> ---
> V2:
> - use credit2 per-cpu specific sibling mask
> ---
>
Reviewed-by: Dario Faggioli <dfaggioli@xxxxxxxx>

Regards,
Dario
-- 
Dario Faggioli, Ph.D
http://about.me/dario.faggioli
Virtualization Software Engineer
SUSE Labs, SUSE https://www.suse.com/
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