for_each_pool_worker(9)

💅 for_each_pool_worker(9) 💅

okay so we're in the Kernel API Manual, and today's main character is for_each_pool_worker(9) — the little iterator that goes through all workers of a worker_pool. iconic behavior. ✨

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🎀 NAME 🎀

for_each_pool_worker — iterate through all workers of a worker_pool. literally that's the vibe. 💖

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🦋 SYNOPSIS 🦋

for_each_pool_worker (worker , pool );

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🌸 ARGUMENTS 🌸

• worker — iteration cursor. it's the little cursor doing the looping, bestie. 🫶
• pool — the worker_pool to iterate workers of. yes, that exact one. 🎀

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✨ DESCRIPTION ✨

okay so before you do the whole loop thing: this must be called with wq_pool_attach_mutex. not optional, not a suggestion, it's giving hard requirement. 🔒

and the if/else clause you might clock in there? it exists only for the lockdep assertion and can be ignored. no cap, don't let it distract you. 💅

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🔥 SEE ALSO 🔥

the Kernel file ./kernel/workqueue.c is home base, and the SEE ALSO list is literally a whole squad. here's the full lineup, in order, no skips: 👑

• for_each_pool(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_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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okay that's the whole page, bestie 🫶 — source/version: ./kernel; date: October 2026. byeee! 💖