Re: [PATCH 6/6] cpu: Add per-CPU preferred sysfs control

[sashiko-bot@kernel.org]

> Expose a writable preferred attribute for each CPU so users can manually
> select CPUs for scheduler placement. This allows users to select any
> desired combination of preferred CPUs, except for selecting inactive
> CPUs and deselecting the last preferred CPU.
> 
> The manual method doesn't imply any preference over automated governors.
> If an automated module is loaded, it may override user preferences, and
> vice versa.
> 
> Fair tasks whose allowed CPUs contain no preferred CPU can still run
> on active non-preferred CPUs. Other scheduling classes are unaffected.
> This creates an environment similar to isolcpus, except that the list of
> isolated CPUs can't be changed at runtime. Tick suppression, RCU
> offloading, and managed-IRQ avoidance are compatible with preferred CPUs,
> but may require separate configuration.
> 
> Signed-off-by: Yury Norov <ynorov@nvidia.com>

Sashiko has reviewed this patch and found no issues.

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Sashiko AI review · https://sashiko.dev/#/patchset/20261101192203.6979-1-ynorov@nvidia.com?part=6