sched_setscheduler(9)

💅 NAME 💅

okay so bestie, this is sched_setscheduler from the Kernel API Manual — and it does exactly one iconic thing: it changes the scheduling policy and/or the RT priority of a thread. that's it. that's the whole gig. ✨

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🌸 SYNOPSIS 🌸

int sched_setscheduler (struct task_struct *p , int policy , const
struct sched_param *param );

like, look at her. three args, one int coming back. main character energy fr fr 💅

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🎀 ARGUMENTS 🎀

• p — the task in question 👀 yeah. that task. the one you're looking at.
• policy — the new policy. you're picking her whole vibe.
• param — a structure containing the new RT priority. that's where the priority lives 🫶

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🦋 DESCRIPTION 🦋

okay so real talk: use sched_set_fifo, and read its comment. that's the assignment. go read the comment. iykyk 📖✨

⚠️ NOTE that the task may be already dead. 😭 like genuinely. no cap. it might already be gone by the time you get here, and that's just the situation you're in. not me finding out the task is dead mid-call 💀

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🌈 RETURN 🌈

• 0 on success — slay, we ate, everything worked 💖
• An error code otherwise — aka it did not slay, and you get a number about it 🙈

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👑 SEE ALSO 👑

Kernel file ./kernel/sched/syscalls.c — and honestly the whole friend group:

• task_prio(9)
• idle_cpu(9)
• idle_task(9)
• find_process_by_pid(9)
• sched_setscheduler_nocheck(9)
• sys_sched_setscheduler(9)
• sys_sched_setparam(9)
• sys_sched_setattr(9)
• sys_sched_getscheduler(9)
• sys_sched_getparam(9)
• sys_sched_getattr(9)
• sys_sched_setaffinity(9)
• sys_sched_getaffinity(9)
• sys_sched_yield(9)
• yield(9)
• yield_to(9)
• sys_sched_get_priority_max(9)
• sys_sched_get_priority_min(9)
• sys_sched_rr_get_interval(9)

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anyway that's the page, bestie 🧚 from ./kernel/sched, dated October 2026, and the page itself is sched_setscheduler(9). mwah 💋 go read that comment now fr fr 🍓