scx_call_op_set_cpumask(9)

💖 scx_call_op_set_cpumask(9) — Kernel API Manual 💖

🌸 NAME 🌸

scx_call_op_set_cpumask — Invoke the set_cpumask or set_cmask op for @task

✨ SYNOPSIS ✨

void scx_call_op_set_cpumask (struct scx_sched *sch , struct rq *rq ,
       struct task_struct *task , const struct cpumask *cpumask );

🎀 ARGUMENTS 🎀

• sch — the scx_sched being invoked, okay bestie this is the scheduler in question 👑
• rq — the rq to update as the currently-locked rq, or NULL
• task — the task whose affinity is changing, main character energy fr fr
• cpumask — the new cpumask, fresh outta the group chat 💅

🦋 DESCRIPTION 🦋

Okay so for cid-form schedulers, this translates cpumask to a cmask in the per-cpu scratch and dispatches through the ops_cid union view. It’s giving very specific kernel behavior, and we love that for us ✨

🚨 Caller must hold rq's rq lock. That part is literally not optional, bestie — no cap.

🌈 SEE ALSO 🌈

Kernel file ./kernel/sched/ext/ext.c — yes, that’s the spot — plus the whole iconic roster:

• scx_is_descendant(9), rq_is_open(9), scx_fill_cmask_scratch(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_task_cid(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)

xoxo, your kernel bestie 💖 — source/version: ./kernel/sched/ext, date: October 2026 🎀✨