Re: [RFC PATCH 0/5] cgroup/cpuset: A new "isolcpus" paritition

[Waiman Long <longman@redhat.com>]

On 4/12/23 20:03, Tejun Heo wrote:
> Hello,
>
> On Wed, Apr 12, 2023 at 04:33:29PM -0400, Waiman Long wrote:
>> I think we can. You mean having a new "cpuset.cpus.isolated" cgroupfs file.
>> So there will be one in the root cgroup that defines all the isolated CPUs
>> one can have. It is then distributed down the hierarchy and can be claimed
>> only if a cgroup becomes an "isolated" partition. There will be a slight
> Yeah, that seems a lot more congruent with the typical pattern.
>
>> change in the semantics of an "isolated" partition, but I doubt there will
>> be much users out there.
> I haven't thought through it too hard but what prevents staying compatible
> with the current behavior?

It is possible to stay compatible with existing behavior. It is just 
that a break from existing behavior will make the solution more clean.

So the new behavior will be:

   If the "cpuset.cpus.isolated" isn't set, the existing rules applies. 
If it is set, the new rule will be used.

Does that look reasonable to you?

Cheers,
Longman