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Message-ID: <21d002b1-442b-737d-6837-677256549435@efficios.com>
Date: Fri, 18 Aug 2023 11:40:06 -0400
From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
Valentin Schneider <vschneid@...hat.com>,
Steven Rostedt <rostedt@...dmis.org>,
Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
Daniel Bristot de Oliveira <bristot@...hat.com>,
Vincent Guittot <vincent.guittot@...aro.org>,
Juri Lelli <juri.lelli@...hat.com>,
Swapnil Sapkal <Swapnil.Sapkal@....com>,
Aaron Lu <aaron.lu@...el.com>,
Julien Desfossez <jdesfossez@...italocean.com>, x86@...nel.org
Subject: Re: [RFC PATCH 2/3] sched: Introduce cpus_share_l2c
On 8/18/23 11:30, Mathieu Desnoyers wrote:
[...]
>
> + cluster_mask = topology_cluster_cpumask(cpu);
> + l2c_size = cpumask_weight(cluster_mask);
> + if (l2c_size == 1) {
> + /* Fallback on using LLC. */
> + l2c_size = size;
> + l2c_id = id;
> + }
For the fallback case, this should be:
cluster_mask = topology_cluster_cpumask(cpu);
l2c_size = cpumask_weight(cluster_mask);
if (l2c_size == 1) {
/* Fallback on using LLC. */
l2c_size = size;
l2c_id = id;
} else {
l2c_id = cpumask_first(cluster_mask);
}
per_cpu(sd_l2c_id, cpu) = l2c_id;
per_cpu(sd_l2c_size, cpu) = l2c_size;
Thanks,
Mathieu
> + l2c_id = cpumask_first(cluster_mask);
> + per_cpu(sd_l2c_id, cpu) = l2c_id;
> + per_cpu(sd_l2c_size, cpu) = l2c_size;
> +
> rcu_assign_pointer(per_cpu(sd_llc, cpu), sd);
> per_cpu(sd_llc_size, cpu) = size;
> per_cpu(sd_llc_id, cpu) = id;
--
Mathieu Desnoyers
EfficiOS Inc.
https://www.efficios.com
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