linux-kernel - [PATCH net-next V2 1/2] sched/topology: Expose sched_numa_find

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Message-ID: <20220718124315.16648-2-tariqt@nvidia.com>
Date:   Mon, 18 Jul 2022 15:43:14 +0300
From:   Tariq Toukan <tariqt@...dia.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Saeed Mahameed <saeedm@...dia.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>
CC:     Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, <netdev@...r.kernel.org>,
        Gal Pressman <gal@...dia.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        <linux-kernel@...r.kernel.org>, Tariq Toukan <tariqt@...dia.com>
Subject: [PATCH net-next V2 1/2] sched/topology: Expose sched_numa_find_closest

This logic can help device drivers prefer some remote cpus
over others, according to the NUMA distance metrics.

Reviewed-by: Gal Pressman <gal@...dia.com>
Signed-off-by: Tariq Toukan <tariqt@...dia.com>
---
 include/linux/sched/topology.h | 2 ++
 kernel/sched/topology.c        | 1 +
 2 files changed, 3 insertions(+)

v2:
Replaced EXPORT_SYMBOL with EXPORT_SYMBOL_GPL, per Peter's comment.

diff --git a/include/linux/sched/topology.h b/include/linux/sched/topology.h
index 56cffe42abbc..d467c30bdbb9 100644
--- a/include/linux/sched/topology.h
+++ b/include/linux/sched/topology.h
@@ -61,6 +61,8 @@ static inline int cpu_numa_flags(void)
 {
 	return SD_NUMA;
 }
+
+int sched_numa_find_closest(const struct cpumask *cpus, int cpu);
 #endif
 
 extern int arch_asym_cpu_priority(int cpu);
diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index 05b6c2ad90b9..274fb2bd3849 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -2066,6 +2066,7 @@ int sched_numa_find_closest(const struct cpumask *cpus, int cpu)
 
 	return found;
 }
+EXPORT_SYMBOL_GPL(sched_numa_find_closest);
 
 #endif /* CONFIG_NUMA */
 
-- 
2.21.0