idle_cpu_without(9)

💅 idle_cpu_without(9) — Kernel API Manual 🎀

okay so bestie, welcome to idle_cpu_without, part of the Kernel API Manual ✨ this one's short and sweet but like, actually important, so pay attention 🫶

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✨ NAME ✨

idle_cpu_without — would a given CPU be idle without p ? 🦋

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✨ SYNOPSIS ✨

int idle_cpu_without (int cpu , struct task_struct *p );

that's it. that's the whole vibe check 💅

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✨ ARGUMENTS ✨

• cpu — the processor on which idleness is tested. the CPU we're literally interrogating about its chill levels 🖥️✨
• p — task which should be ignored. like, pretend this task doesn't exist, bestie, it's not part of the equation 🙈

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✨ RETURN ✨

• 1 if the CPU would be idle. slay, it's free 💖
• 0 otherwise. not idle, no cap 💀

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✨ SEE ALSO ✨

the Kernel file ./kernel/sched/fair.c + the whole friend group 👑:

• update_tg_load_avg(9)
• update_cfs_rq_load_avg(9)
• attach_entity_load_avg(9)
• detach_entity_load_avg(9)
• cpu_util(9)
• sched_use_asym_prio(9)
• sched_group_asym(9)
• update_sg_lb_stats(9)
• update_sd_pick_busiest(9)
• update_sd_lb_stats(9)
• calculate_imbalance(9)
• sched_balance_find_src_group(9)

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ngl this page is giving "small but mighty" energy — it's literally just one question: would this CPU be idle if we ignored p? one integer answer, 1 or 0, periodt. no sneaky side effects mentioned here, so don't go assuming any 🍓

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and that's a wrap, bestie 🌈 this gem lives in ./kernel/sched, it's dated October 2026, and it goes by idle_cpu_without(9) 💜 mwah, go touch some scheduler code 🧚⭐