Re: [cgroup/for-6.19 PATCH 2/3] cgroup/cpuset: Fail if isolated and nohz_full don't leave any housekeeping

[Chen Ridong]

> +
>  	/*
>  	 * Change the parent's effective_cpus & effective_xcpus (top cpuset
>  	 * only).
> @@ -2994,7 +3055,11 @@ static int update_prstate(struct cpuset *cs, int new_prs)
>  		 * A change in load balance state only, no change in cpumasks.
>  		 * Need to update isolated_cpus.
>  		 */
> -		isolcpus_updated = true;
> +		if ((new_prs == PRS_ISOLATED) &&
> +		    !isolated_cpus_can_update(cs->effective_xcpus, NULL))
> +			err = PERR_HKEEPING;
> +		else
> +			isolcpus_updated = true;
>  	} else {
>  		/*
>  		 * Switching back to member is always allowed even if it

This is an issue I am trying to fix, the prstate_housekeeping_conflict check is necessary.

https://lore.kernel.org/cgroups/20251025064844.495525-2-chenridong@xxxxxxxxxxxxxxx/

-- 
Best regards,
Ridong