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Message-ID: <YtUzu4d9F+V621tw@worktop.programming.kicks-ass.net> Date: Mon, 18 Jul 2022 12:19:39 +0200 From: Peter Zijlstra <peterz@...radead.org> To: Tariq Toukan <tariqt@...dia.com> Cc: "David S. Miller" <davem@...emloft.net>, Saeed Mahameed <saeedm@...dia.com>, Jakub Kicinski <kuba@...nel.org>, Ingo Molnar <mingo@...hat.com>, Juri Lelli <juri.lelli@...hat.com>, 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 Subject: Re: [PATCH net-next 1/2] sched/topology: Expose sched_numa_find_closest On Sun, Jul 17, 2022 at 08:23:00AM +0300, Tariq Toukan wrote: > 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(+) > > 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..688334ac4980 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(sched_numa_find_closest); EXPORT_SYMBOL_GPL() if anything. Also, this thing will be subject to sched_domains, that means that if someone uses cpusets or other means to partition the machine, that effects the result. Is that what you want?
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