# Re: \[PATCH v13 04/13\] cpumask: Introduce cpu\_preferred\_mask

- From: sashiko-bot@kernel.org
- Date: 2026-09-09 14:06:26 
- List: virtualization
- Page: https://ratatoskr.run/virtualization/2026/09/17539210
- Thread: https://ratatoskr.run/virtualization/2026/09/17538960/t.md

```text
> Provide the preferred CPU infrastructure. Define get/set macros
> which could be used to get/set CPU state as preferred.
> 
> CONFIG_PREFERRED_CPU will be selected by the driver which handles
> steal time values. It is going to set/clear preferred CPU state.
> This driver will be called steal_governor and it is introduced in
> subsequent patches. It periodically computes the steal ratio and
> decides on preferred CPU state.
> 
> A CPU is set to preferred when it becomes active. Later it may be
> marked as non-preferred depending on steal ratio by the steal_governor.
> 
> Always maintain design construct of preferred is subset of active.
> i.e. preferred ⊆ active ⊆ online ⊆ present ⊆ possible
> 
> With CONFIG_PREFERRED_CPU=n, ensure set_cpu_preferred is a nop and get
> method returns the active state in that case.
> 
> Signed-off-by: Shrikanth Hegde <sshegde@linux.ibm.com>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260909135617.871006-1-sshegde@linux.ibm.com?part=4

```