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Message-ID: <72170546-fad0-0b96-e075-b755c3a48bec@gmail.com> Date: Mon, 18 Jul 2022 14:42:52 +0300 From: Tariq Toukan <ttoukan.linux@...il.com> To: Peter Zijlstra <peterz@...radead.org>, 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 7/18/2022 1:19 PM, Peter Zijlstra wrote: > 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. I'll fix. > > 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? Yes, it's good enough, at least as a first phase and basic functionality. Later we might introduce whatever enhancements we find necessary. Thanks, Tariq
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