Re: [PATCH 2/2] sched/fair: Reimplement NEXT_BUDDY to align with EEVDF goals

[Peter Zijlstra]

On Wed, Nov 12, 2025 at 12:25:21PM +0000, Mel Gorman wrote:

> +	/* Prefer picking wakee soon if appropriate. */
> +	if (sched_feat(NEXT_BUDDY) &&
> +	    set_preempt_buddy(cfs_rq, wake_flags, pse, se)) {
> +
> +		/*
> +		 * Decide whether to obey WF_SYNC hint for a new buddy. Old
> +		 * buddies are ignored as they may not be relevant to the
> +		 * waker and less likely to be cache hot.
> +		 */
> +		if (wake_flags & WF_SYNC)
> +			preempt_action = preempt_sync(rq, wake_flags, pse, se);
> +	}

Why only do preempt_sync() when NEXT_BUDDY? Nothing there seems to
depend on buddies.