linux-kernel - Re: [PATCH v3 2/2] sched: Fix sched domain build error for GNR, CWF in SNC-3 mode

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Message-ID: <9b45b33c-3bd1-4075-98a3-d8f5cfc08785@intel.com>
Date: Fri, 12 Sep 2025 13:39:41 +0800
From: "Chen, Yu C" <yu.c.chen@...el.com>
To: Tim Chen <tim.c.chen@...ux.intel.com>, Peter Zijlstra
	<peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>
CC: Juri Lelli <juri.lelli@...hat.com>, Dietmar Eggemann
	<dietmar.eggemann@....com>, Ben Segall <bsegall@...gle.com>, Mel Gorman
	<mgorman@...e.de>, Valentin Schneider <vschneid@...hat.com>, Tim Chen
	<tim.c.chen@...el.com>, Vincent Guittot <vincent.guittot@...aro.org>, "Libo
 Chen" <libo.chen@...cle.com>, Abel Wu <wuyun.abel@...edance.com>, Len Brown
	<len.brown@...el.com>, <linux-kernel@...r.kernel.org>, K Prateek Nayak
	<kprateek.nayak@....com>, "Gautham R . Shenoy" <gautham.shenoy@....com>,
	"Zhao Liu" <zhao1.liu@...el.com>, Vinicius Costa Gomes
	<vinicius.gomes@...el.com>, Arjan Van De Ven <arjan.van.de.ven@...el.com>
Subject: Re: [PATCH v3 2/2] sched: Fix sched domain build error for GNR, CWF
 in SNC-3 mode

On 9/12/2025 2:30 AM, Tim Chen wrote:

[snip]

>   
> +int arch_sched_node_distance(int from, int to)
> +{
> +	int d = node_distance(from, to);
> +
> +	if (!x86_has_numa_in_package)
> +		return d;
> +
> +	switch (boot_cpu_data.x86_vfm) {
> +	case INTEL_GRANITERAPIDS_X:
> +	case INTEL_ATOM_DARKMONT_X:
> +		if (d < REMOTE_DISTANCE)
> +			return d;
> +
> +		/*
> +		 * Trim finer distance tuning for nodes in remote package
> +		 * for the purpose of building sched domains.  Put NUMA nodes
> +		 * in each remote package in the same sched group.
> +		 * Simplify NUMA domains and avoid extra NUMA levels including
> +		 * different NUMA nodes in remote packages.
> +		 *
> +		 * GNR and CWF don't expect systmes with more than 2 packages
> +		 * and more than 2 hops between packages.
> +		 */
> +		d = sched_avg_remote_numa_distance;

sched_avg_remote_numa_distance is defined in topology.c with
CONFIG_NUMA controlled, should we make arch_sched_node_distance()
be controlled under CONFIG_NUMA too?

thanks,
Chenyu

> +	}