Re: [PATCH 1/2] cgroup/cpuset: Make cpuset hotplug processing synchronous

[Waiman Long]

On 4/3/24 10:56, Michal Koutný wrote:
> On Wed, Apr 03, 2024 at 10:47:33AM -0400, Waiman Long <longman@xxxxxxxxxx> wrote:
> > should be rare these days as it will only apply in the case of cgroup
> > v1 under certain condtion,
> Could the migration be simply omitted it those special cases?
>
> (Tasks remain in cpusets with empty cpusets -- that already happens in
> with the current patch before workqueue is dispatched.)

The tasks should not be runnable if there is no CPUs left in their v1 
cpuset. Migrating them to a parent with runnable CPUs is the current way 
which I don't want to break. Alternatively, we could force it to fall 
back to cgroup v2 behavior using the CPUs in their parent cpuset.

Cheers,
Longman

> Michal