Re: [RFC PATCH 1/5] cpumask: Introduce cpu parked mask

[Shrikanth Hegde]

On 5/27/25 20:36, Yury Norov wrote:
> On Fri, May 23, 2025 at 11:44:44PM +0530, Shrikanth Hegde wrote:
> > CPU is said to be parked, when underlying physical CPU is not
> > available. This happens when there is contention for CPU resource in
> > para-virtualized case. One should avoid using these CPUs.
> >
> > Build and maintain this state of parked CPUs. Scheduler will use this
> > information and push the tasks out as soon as it can.
>
> This 'parked' term sounds pretty obscured. Maybe name it in
> a positive sense, and more explicit, like cpu_paravirt_mask.

I still dont know a better name. Maybe something like cpu_avoid_mask and
cpu avoid(cpu)? I would like to retain a notion that these CPU shouldn't be used
at the moment.

> Also, shouldn't this be conditional on CONFIG_PARAVIRT?

I moved the uses of it under a static key which should make it a nop for
others. That keeps code relatively simpler. Hope that's ok.

> Thanks,
> Yury
>