scx_bpf_task_cid(9)

💖 NAME 💖

okay so bestie, welcome to scx_bpf_task_cid(9) — your Kernel API Manual moment. This one tells you the cid a task is currently associated with. lowkey simple, highkey useful, no cap. 🫶

✨ SYNOPSIS ✨

__bpf_kfunc s32 scx_bpf_task_cid (const struct task_struct *p );

🎀 ARGUMENTS 🎀

• p — task of interest. that’s the task you’re asking about, bestie 💅

🦋 DESCRIPTION 🦋

It’s the cid-addressed equivalent of scx_bpf_task_cpu. Since task_cpu(p) is always a valid cpu, this is just a table lookup — literally, that’s the whole vibe. 🌸

Heads up: it returns -EINVAL if called before any scheduler has ever published its cid tables. so if nobody’s published the cid tables yet, you get -EINVAL, periodt. 😭

🌈 SEE ALSO 🌈

The kernel file is ./kernel/sched/ext/ext.c, and here’s the whole linked-reference friend group, exactly as listed — no cap, every single one: 😤

• scx_is_descendant(9)
• rq_is_open(9)
• scx_fill_cmask_scratch(9)
• scx_call_op_set_cpumask(9)
• nldsq_next_task(9)
• nldsq_cursor_next_task(9)
• nldsq_cursor_lost_task(9)
• scx_task_iter_start(9)
• scx_task_iter_unlock(9)
• scx_task_iter_relock(9)
• scx_task_iter_stop(9)
• scx_task_iter_next(9)
• scx_task_iter_next_locked(9)
• scx_dump_event(9)
• wait_ops_state(9)
• scx_cpu_valid(9)
• schedule_deferred(9)
• schedule_deferred_locked(9)
• dsq_insert_head(9)
• set_task_slice_keep_oob(9)
• scx_task_slice_ended(9)
• move_remote_task_to_local_dsq(9)
• unlink_dsq_and_switch_rq_lock(9)
• move_task_between_dsqs(9)
• dispatch_to_local_dsq(9)
• finish_dispatch(9)
• scx_prio_less(9)
• __scx_init_task(9)
• task_dead_and_done(9)
• scx_tg_sched(9)
• scx_tg_knob_sched(9)
• handle_lockup(9)
• scx_rcu_cpu_stall(9)
• scx_softlockup(9)
• scx_hardlockup(9)
• unbypass_renotify_idle(9)
• scx_bypass(9)
• scx_propagate_exit_irq_workfn(9)
• scx_flush_disable_work(9)
• print_scx_info(9)
• scx_bpf_dsq_insert___v2(9)
• __scx_bpf_dsq_insert_vtime(9)
• scx_bpf_dispatch_nr_slots(9)
• scx_bpf_dispatch_cancel(9)
• scx_bpf_dsq_move_to_local___v2(9)
• scx_bpf_dsq_move_set_slice(9)
• scx_bpf_dsq_move_set_vtime(9)
• scx_bpf_dsq_move(9)
• scx_bpf_dsq_move_vtime(9)
• scx_bpf_reenqueue_local(9)
• scx_bpf_create_dsq(9)
• scx_bpf_task_set_slice(9)
• scx_bpf_task_set_dsq_vtime(9)
• scx_bpf_kick_cpu(9)
• scx_bpf_kick_cid(9)
• scx_bpf_dsq_nr_queued(9)
• scx_bpf_destroy_dsq(9)
• bpf_iter_scx_dsq_new(9)
• bpf_iter_scx_dsq_next(9)
• bpf_iter_scx_dsq_destroy(9)
• scx_bpf_dsq_peek(9)
• scx_bpf_dsq_reenq(9)
• scx_bpf_reenqueue_local___v2(9)
• scx_bpf_exit_bstr(9)
• scx_bpf_error_bstr(9)
• scx_bpf_dump_bstr(9)
• scx_bpf_cpuperf_cap(9)
• scx_bpf_cidperf_cap(9)
• scx_bpf_cpuperf_cur(9)
• scx_bpf_cidperf_cur(9)
• scx_bpf_cpuperf_set(9)
• scx_bpf_cidperf_set(9)
• scx_bpf_nr_node_ids(9)
• scx_bpf_nr_cpu_ids(9)
• scx_bpf_nr_cids(9)
• scx_bpf_nr_online_cids(9)
• scx_bpf_online_cmask(9)
• scx_bpf_this_cid(9)
• scx_bpf_get_possible_cpumask(9)
• scx_bpf_get_online_cpumask(9)
• scx_bpf_put_cpumask(9)
• scx_bpf_task_running(9)
• scx_bpf_task_cpu(9)
• scx_bpf_locked_rq(9)
• scx_bpf_cpu_curr(9)
• scx_bpf_cid_curr(9)
• scx_bpf_tid_to_task(9)
• scx_bpf_now(9)
• scx_bpf_events(9)
• scx_bpf_task_cgroup(9)

later bestie 💖 — this page comes from ./kernel/sched/ext, dated October 2026, and it’s all scx_bpf_task_cid(9) energy. slay. 👑