diff options
| author | Valentin Schneider <vschneid@redhat.com> | 2023-01-20 20:24:33 -0800 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2023-02-07 18:20:00 -0800 |
| commit | 9feae65845f7b16376716fe70b7d4b9bf8721848 (patch) | |
| tree | 10c9cf542cad95b89564fbdf5617fc6b5b8857f9 /include/linux/topology.h | |
| parent | b1beed72b8b75d365fdbc925da856c212195051b (diff) | |
sched/topology: Introduce sched_numa_hop_mask()
Tariq has pointed out that drivers allocating IRQ vectors would benefit
from having smarter NUMA-awareness - cpumask_local_spread() only knows
about the local node and everything outside is in the same bucket.
sched_domains_numa_masks is pretty much what we want to hand out (a cpumask
of CPUs reachable within a given distance budget), introduce
sched_numa_hop_mask() to export those cpumasks.
Link: http://lore.kernel.org/r/20220728191203.4055-1-tariqt@nvidia.com
Signed-off-by: Valentin Schneider <vschneid@redhat.com>
Reviewed-by: Yury Norov <yury.norov@gmail.com>
Signed-off-by: Yury Norov <yury.norov@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'include/linux/topology.h')
| -rw-r--r-- | include/linux/topology.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/topology.h b/include/linux/topology.h index 72f264575698..344c2362755a 100644 --- a/include/linux/topology.h +++ b/include/linux/topology.h @@ -247,11 +247,18 @@ static inline const struct cpumask *cpu_cpu_mask(int cpu) #ifdef CONFIG_NUMA int sched_numa_find_nth_cpu(const struct cpumask *cpus, int cpu, int node); +extern const struct cpumask *sched_numa_hop_mask(unsigned int node, unsigned int hops); #else static __always_inline int sched_numa_find_nth_cpu(const struct cpumask *cpus, int cpu, int node) { return cpumask_nth(cpu, cpus); } + +static inline const struct cpumask * +sched_numa_hop_mask(unsigned int node, unsigned int hops) +{ + return ERR_PTR(-EOPNOTSUPP); +} #endif /* CONFIG_NUMA */ #endif /* _LINUX_TOPOLOGY_H */ |