Re: [PATCH v4 16/20] sched/core: Introduce default arch handling code for inc/dec preferred CPUs

[Shrikanth Hegde]

On 6/18/26 9:45 AM, Yury Norov wrote:
> On Wed, Jun 17, 2026 at 11:11:35PM +0530, Shrikanth Hegde wrote:
> > Define default handlers for high/low steal time. If arch has better
> > decision logic, may override the default implementation.
> >
> > - If the steal time higher than threshold, reduce the number of preferred
> >    CPUs by 1 core. The last core in the intersection of active and
> >    preferred CPUs will be marked as non-preferred.
> >    Ensure at least one core is left as preferred always.
> >
> > - If the steal time lower than threshold, increase the number of preferred
> >    CPUs by 1 core. First active core which is not in cpu_preferred_mask will
> >    be marked as preferred.
> >    If all cores are already set to preferred, bail out.
>
> And the code below does nothing of that.

Agree. My bad. This changelog needs update.

>   
> > Increase/Decrease may need to modify the splicing across NUMA nodes. It is
> > being kept simple for now.
> >
> > Signed-off-by: Shrikanth Hegde <sshegde@xxxxxxxxxxxxx>