Re: [PATCH 11/19] sched/fair: Identify busiest sched_group for LLC-aware load balancing

[Peter Zijlstra]

On Sat, Oct 11, 2025 at 11:24:48AM -0700, Tim Chen wrote:

> @@ -11035,6 +11059,17 @@ static bool update_sd_pick_busiest(struct lb_env *env,
>  	     sds->local_stat.group_type != group_has_spare))
>  		return false;
>  
> +	/* deal with prefer LLC load balance, if failed, fall into normal load balance */
> +	if (update_llc_busiest(env, busiest, sgs))
> +		return true;
> +
> +	/*
> +	 * If the busiest group has tasks with LLC preference,
> +	 * skip normal load balance.
> +	 */
> +	if (busiest->group_llc_balance)
> +		return false;
> +
>  	if (sgs->group_type > busiest->group_type)
>  		return true;

This feels weird.. should we really override things like group_imbalance
or group_misfit_task ?