freeze_workqueues_busy(9)

💅 freeze_workqueues_busy(9) 💅

okay so bestie, welcome to the Kernel API Manual — this one's a tiny little function from the workqueue saga and honestly it's giving "short but essential" 🎀

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✨ NAME ✨

freeze_workqueues_busy — so like… are the freezable workqueues still busy or what? 👀

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🌸 SYNOPSIS 🌸

bool freeze_workqueues_busy (void );

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🦋 ARGUMENTS 🦋

• void — literally no arguments. nothing. zero. she takes nothing and she delivers a bool 💅

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💖 DESCRIPTION 💖

Okay so the whole vibe here is: you're checking whether freezing is complete. That's it, that's the job 🫶

But — and this is the important part, no cap — this function must be called between freeze_workqueues_begin and thaw_workqueues. Like, that's the window, bestie. Don't be out here calling it whenever 😭

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🧚 CONTEXT 🧚

She grabs and releases wq_pool_mutex. Lowkey iconic, highkey relevant — keep that in mind so you don't deadlock your whole situation 💀

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⭐ RETURN ⭐

• true — yep, some freezable workqueues are still busy 😤
• false — freezing is complete, we're so back 🎉

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👑 SEE ALSO 👑

Kernel file ./kernel/workqueue.c — and listen, the whole workqueue friend group showed up for this one, it's a whole reunion 🌈

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), 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)

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🍓 friendly reminder from your girl: freeze_workqueues_begin → this → thaw_workqueues. that's the order. iykyk 💜

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okay that's the whole page, bestie — she lives in ./kernel, dated October 2026, and this has been freeze_workqueues_busy(9). go forth and check your workqueues 💅✨🎀