Re: [PATCH v4 6/7] sched/fair: skip busy cores in SIS search

[Abel Wu]

On 6/22/22 2:14 AM, Chen Yu Wrote:
> Hi Abel,
> On Sun, Jun 19, 2022 at 08:04:50PM +0800, Abel Wu wrote:
> > Try to improve efficiency of SIS domain search by filtering out busy
> > cores, and as a result the more overloaded the system is, the less
> > cpus will be scanned.
> >
> > The filter is supposed to contain unoccupied cpus of the LLC. And we
> > propagate these cpus to the filter one at a time at core granule.
> > This can help spreading load to different cores given that the search
> > depth is limited. The chosen cpu to be propagated is guaranteed to be
> > unoccupied at that time.
> >
> > When idle cpu exists, the last one is preferred in order not to
> > conflict with periodic load balancing during which the first idle
> > cpu (if any) is chosen to be fed with tasks.
> Maybe the content in cover letter could be copied into this git log for
> future reference?

Definitely. Will fix this in next version.
Thanks.