linux-kernel - Re: [PATCH v3 1/8] sched/topology: Compute sd

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Message-ID: <3c2793bc-3bde-4872-be88-b906127ba74f@linux.ibm.com>
Date: Wed, 21 Jan 2026 21:12:07 +0530
From: Shrikanth Hegde <sshegde@...ux.ibm.com>
To: K Prateek Nayak <kprateek.nayak@....com>
Cc: Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        linux-kernel@...r.kernel.org,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>,
        Mel Gorman <mgorman@...e.de>, Valentin Schneider <vschneid@...hat.com>,
        Chen Yu <yu.c.chen@...el.com>,
        "Gautham R. Shenoy" <gautham.shenoy@....com>
Subject: Re: [PATCH v3 1/8] sched/topology: Compute sd_weight considering
 cpuset partitions



On 1/20/26 5:02 PM, K Prateek Nayak wrote:
> The "sd_weight" used for calculating the load balancing interval, and
> its limits, considers the span weight of the entire topology level
> without accounting for cpuset partitions.
>

Please add one example showing the wrong sd_weights
while having cpuset partitions. That would be helpful.

> Compute the "sd_weight" after computing the "sd_span" considering the
> cpu_map covered by the partition, and set the load balancing interval,
> and its limits accordingly.
> 
> Fixes: cb83b629bae03 ("sched/numa: Rewrite the CONFIG_NUMA sched domain support")
> Signed-off-by: K Prateek Nayak <kprateek.nayak@....com>
> ---
> Changelog rfc v2..v3:
> 
> o New patch.
> ---

Reviewed-by: Shrikanth Hegde <sshegde@...ux.ibm.com>