queue_rcu_work(9)

💅 queue_rcu_work(9) — like, the RCU-work-queueing girlie

okay so this is a page from the Kernel API Manual, and it's about queue_rcu_work — the function that's basically "bestie, do this work, but after an RCU grace period, mkay?" ✨

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🌸 NAME 🌸

queue_rcu_work — queue work after a RCU grace period

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🎀 SYNOPSIS 🎀

bool queue_rcu_work (struct workqueue_struct *wq , struct rcu_work
*rwork );

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🦋 ARGUMENTS 🦋

• wq — the workqueue you wanna use, like picking which group chat to drop the message in 💬
• rwork — the work you're queueing up, the actual message bestie 📨

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⭐ RETURN ⭐

It hands you back a bool, and here's the tea:

• false → rwork was already pending. Like, it's already in the queue, girl, you're not doing anything new 🙈
• true → otherwise! Fresh queue, fresh you 💅

⚠️ okay listen, this part is important, no cap: a full RCU grace period is guaranteed only after a true return. If you got false back, rwork is still guaranteed to execute — but that execution may happen before a full RCU grace period has passed. So don't go assuming the grace period happened just because your work ran, fr fr 😭

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🔥 SEE ALSO 🔥

Kernel file ./kernel/workqueue.c — and honestly the whole workqueue extended universe, here we go 👑

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), 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 thing, you ate that bestie 🫶 go forth and queue your RCU work responsibly, mwah 💖

📌 source/version vibes: ./kernel, dated October 2026 — that's the tea, and queue_rcu_work(9) is the name of the game 🎀✨