Re: [PATCH 0/6] Optimize the cpu hotplug locking -v2

[Oleg Nesterov]

On 10/10, Peter Zijlstra wrote:
>
> The freeze suggestion from Ingo would actually work because we freeze
> tasks at known good points

Not really known/good, we have more and more freezable_schedule's.
But probably this is fine, nobody should do this under get_online_cpus().

> (userspace and kthread_freeze() points) where
> we know they're not fiddling with per-cpu state.

We should also take care of PF_NOFREEZE kthreads.

Oleg.

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