Subject: Re: [PATCH v9 06/20] cpuset: Don't use the cpu_possible_mask as a last resort for cgroup v1

From: Valentin Schneider <[email-masked]>
Date: Thu, 10 Jun 2021 13:59:41 +0100

On 08/06/21 19:02, Will Deacon wrote:
> If the scheduler cannot find an allowed CPU for a task,
> cpuset_cpus_allowed_fallback() will widen the affinity to cpu_possible_mask
> if cgroup v1 is in use.
>
> In preparation for allowing architectures to provide their own fallback
> mask, just return early if we're either using cgroup v1 or we're using
> cgroup v2 with a mask that contains invalid CPUs. This will allow
> select_fallback_rq() to figure out the mask by itself.
>
> Cc: Tejun Heo <[email-masked]>
> Cc: Johannes Weiner <[email-masked]>
> Reviewed-by: Quentin Perret <[email-masked]>
> Signed-off-by: Will Deacon <[email-masked]>

Reviewed-by: Valentin Schneider <[email-masked]>

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