sched_numa_find_nth_cpu(9)

💅 sched_numa_find_nth_cpu(9) — the Kernel API Manual, bestie edition 🎀

okay so picture this: you're in the Kernel API Manual, you open up sched_numa_find_nth_cpu(9), and it's literally the function that answers "hey, out of these CPUs, which one is the Nth closest to this CPU, when you factor in how far away a given NUMA node is?" Like it's giving matchmaker energy but for silicon. 🦋

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✨ NAME ✨

sched_numa_find_nth_cpu — given the NUMA topology, find the Nth closest CPU from @cpus to @cpu, taking into account distance from a given @node. No cap, that's the whole vibe. 🌸

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✨ SYNOPSIS ✨

int sched_numa_find_nth_cpu (const struct cpumask *cpus , int cpu , int node );

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✨ ARGUMENTS ✨

• cpus — the cpumask you wanna find a cpu from 💖 (your candidate pool, basically the group chat you're picking from)
• cpu — the CPU you start searching from 👑 (your main character starting point)
• node — the NUMA node you order CPUs by distance against 🧚 (the vibe check ruler)

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✨ RETURN ✨

Returns cpu, or nr_cpu_ids when nothing found. 😭 Like if the search comes up empty, that's your "no thoughts, head empty" signal — periodt.

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✨ SEE ALSO ✨

• Kernel file ./kernel/sched/topology.c
• sched_numa_hop_mask(9) 🔥

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ok bestie that's the whole page, go forth and be iconic with your CPU selection 🫶

signing off from the Kernel API Manual — source path ./kernel/sched, dated October 2026, and yes this was sched_numa_find_nth_cpu(9) the entire time 💜