# Re: \[PATCH v13 08/13\] sched/core: Push current task from non preferred CPU

- From: sashiko-bot@kernel.org
- Date: 2026-09-09 14:18:21 
- List: virtualization
- Page: https://ratatoskr.run/virtualization/2026/09/17539712
- Thread: https://ratatoskr.run/virtualization/2026/09/17538960/t.md

```text
> Actively push out the current running task on a non-preferred CPU. Since
> the task is currently running, a stopper thread must be queued to push the
> task out. However, if the task is pinned only to non-preferred CPUs,
> it will continue running there. This helps to maintain userspace
> affinities, unlike CPU hotplug or isolated cpusets.
> 
> Though the code is similar to __balance_push_cpu_stop and quite close to
> push_cpu_stop, it is kept separate as it provides a cleaner
> implementation specifically for CONFIG_PREFERRED_CPU.
> 
> Add the npc_push_work_pending flag to protect the work buffer.
> 
> For now, only the currently running task is pushed out. This keeps the code
> simpler. In the future, an optimization may be added to move all queued
> tasks on the runqueue.
> 
> This works only for the FAIR scheduling class.
> 
> 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=8

```