select_numa_node_cpu(9)

💅 select_numa_node_cpu(9) — from the Kernel API Manual, bestie ✨

okay so you found the select_numa_node_cpu page, and honestly? good taste. this one's a lil function that helps you pick a CPU based on a NUMA node. let's get into it 🎀

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🌸 NAME 🌸

select_numa_node_cpu — literally just "Select a CPU based on NUMA node". that's the whole vibe check, no cap.

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✨ SYNOPSIS ✨

int select_numa_node_cpu (int node );

yes bestie, one argument, returns an int. iconic behavior tbh 🫶

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🦋 ARGUMENTS 🦋

• node — the NUMA node ID that we want to select a CPU from. like, "hey, pick me a CPU that lives over here" 🗺️

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💖 DESCRIPTION 💖

so here's the tea: this function will attempt to find a "random" cpu available on a given node. that's the whole job. it goes looking, it tries its best 💅

and if there are no CPUs available on the given node? it doesn't panic, it doesn't cry (well, maybe a lil). it returns WORK_CPU_UNBOUND, which is basically the function saying "idk bestie, nothing here — telling you we should just schedule to any available CPU if we need to schedule this work." fr fr, it's the "no thoughts, just any CPU" fallback 😭

lowkey important: WORK_CPU_UNBOUND is the signal that this node had nothing for you. don't sleep on checking for it 👑

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🌈 SEE ALSO 🌈

okay this is the part where the page goes absolutely feral with cross-references, and we are NOT skipping any of them. every single one, in order, as given — you're welcome, i love you, here we go:

Kernel file ./kernel/workqueue.c: for_each_pool(9), for_each_pool_worker(9), for_each_pwq(9), worker_pool_assign_id(9), unbound_effective_cpumask(9), get_work_pool(9), worker_set_flags(9), worker_clr_flags(9), worker_enter_idle(9), worker_leave_idle(9), find_worker_executing_work(9), move_linked_works(9), assign_work(9), kick_pool_pick(9), kick_pool(9), wq_worker_running(9), wq_worker_sleeping(9), wq_worker_tick(9), wq_worker_last_func(9), wq_node_nr_active(9), wq_update_node_max_active(9), get_pwq(9), put_pwq(9), put_pwq_unlocked(9), pwq_tryinc_nr_active(9), pwq_activate_first_inactive(9), unplug_oldest_pwq(9), node_activate_pending_pwq(9), pwq_dec_nr_active(9), pwq_dec_nr_in_flight(9), try_to_grab_pending(9), work_grab_pending(9), insert_work(9), queue_work_on(9), queue_work_node(9), queue_delayed_work_on(9), mod_delayed_work_on(9), queue_rcu_work(9), worker_attach_to_pool(9), worker_detach_from_pool(9), create_worker(9), set_worker_dying(9), idle_worker_timeout(9), idle_cull_fn(9), maybe_create_worker(9), manage_workers(9), process_one_work(9), process_scheduled_works(9), worker_thread(9), rescuer_thread(9), check_flush_dependency(9), insert_wq_barrier(9), flush_workqueue_prep_pwqs(9), __flush_workqueue(9), drain_workqueue(9), flush_work(9), flush_delayed_work(9), flush_rcu_work(9), cancel_work_sync(9), cancel_delayed_work(9), cancel_delayed_work_sync(9), disable_work(9), disable_work_sync(9), enable_work(9), disable_delayed_work(9), disable_delayed_work_sync(9), enable_delayed_work(9), schedule_on_each_cpu(9), execute_in_process_context(9), free_workqueue_attrs(9), alloc_workqueue_attrs(9), init_worker_pool(9), put_unbound_pool(9), get_unbound_pool(9), wq_calc_pod_cpumask(9), apply_workqueue_attrs(9), unbound_wq_update_pwq(9), wq_adjust_max_active(9), destroy_workqueue(9), workqueue_set_max_active(9), workqueue_set_min_active(9), current_work(9), current_is_workqueue_rescuer(9), current_is_workqueue_mem_reclaim(9), workqueue_congested(9), work_busy(9), set_worker_desc(9), print_worker_info(9), show_one_workqueue(9), show_one_worker_pool(9), show_all_workqueues(9), show_freezable_workqueues(9), rebind_workers(9), restore_unbound_workers_cpumask(9), work_on_cpu_key(9), freeze_workqueues_begin(9), freeze_workqueues_busy(9), thaw_workqueues(9), workqueue_unbound_housekeeping_update(9), workqueue_set_unbound_cpumask(9), workqueue_sysfs_register(9), workqueue_sysfs_unregister(9), workqueue_init_early(9), workqueue_init(9), llc_count_cores(9), llc_populate_cpu_shard_id(9), precompute_cache_shard_ids(9), workqueue_init_topology(9).

that's the whole guest list. ate. 💀🔥

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and that's the page, bestie 💜

this one lives under ./kernel, dated October 2026, and it's page select_numa_node_cpu(9) of the Kernel API Manual — mwah, go read your CPUs, ily, byeee 🧚‍♀️🌸