workqueue_sysfs_register(9)

💅 workqueue_sysfs_register(9) — the "put it in sysfs" era

Okay bestie, grab a snack 🍓 because we're looking at workqueue_sysfs_register(9) from the Kernel API Manual, and honestly? It's a lil function with big main character energy.

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✨ NAME ✨

workqueue_sysfs_register — literally just making a workqueue visible in sysfs 👑

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🌸 SYNOPSIS 🌸

int workqueue_sysfs_register (struct workqueue_struct *wq );

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🎀 ARGUMENTS 🎀

• wq — the workqueue we're about to register. that's the one, that's the girl 💖

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🦋 DESCRIPTION 🦋

So what does it do? It exposes wq in sysfs under /sys/bus/workqueue/devices. That's it, that's the vibe ✨

Now, here's the tea: alloc_workqueue*() calls this function automatically for you if WQ_SYSFS is set, and ngl, that's the preferred method. No cap, let the allocator handle it 🫶

You (the workqueue user) should only call this function directly iff you wanna apply workqueue_attrs before making the workqueue visible in sysfs. Why? Because otherwise apply_workqueue_attrs may race against userland updating the attributes 😭 like, actual chaos. Respect the ordering, bestie.

fr fr: direct call is a whole vibe only when you're setting attrs first. otherwise let alloc_workqueue*() do its thing.

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⭐ RETURN ⭐

• 0 on success 🎉
• -errno on failure 💀

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👑 SEE ALSO 👑

Kernel file ./kernel/workqueue.c, plus the entire extended universe of workqueue functions. Buckle up, this list is giving "squad photo at the end of the school year" 🌈

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), select_numa_node_cpu(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_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)

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And that's the whole page, bestie 💜 stay hydrated, register your workqueues responsibly, and remember — this gem is served up from ./kernel, dated October 2026 🧚✨ mwah 💅