sys_sched_setparam(9)

🌸 sys_sched_setparam — like, the kernel API manual, bestie ✨

okay so real talk, this one lives in the Kernel API Manual section (9), so it's a kernel-internals girlie, not your everyday userland command. come sit with me 💅

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✨ NAME ✨

sys_sched_setparam — set/change the RT priority of a thread 🎀

like. it literally does what it says on the tin. RT priority goes in, RT priority gets set/changed. iconic.

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🦋 SYNOPSIS 🦋

long sys_sched_setparam (pid_t pid , struct sched_param __user * param );

that's the whole signature, no cap. one pid_t, one struct sched_param __user *, and it hands you back a long. 🫶

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🌸 ARGUMENTS 🌸

• pid — the pid in question. yes, that pid. the one you're asking about. 👀
• param — structure containing the new RT priority. that's your struct sched_param __user *, and it's the whole point of the whole function fr fr 💖

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🌈 RETURN 🌈

• 0 on success ✨ slay
• An error code otherwise 😭 (not zero? something went sideways, bestie)

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👑 SEE ALSO 👑

first up, the kernel file it hangs out in: ./kernel/sched/syscalls.c — that's home base 🏠

and then the whole friend group, no one left out:

• task_prio(9)
• idle_cpu(9)
• idle_task(9)
• find_process_by_pid(9)
• sched_setscheduler(9)
• sched_setscheduler_nocheck(9)
• sys_sched_setscheduler(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)

that's the entire group chat, periodt 💀

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ngl if you're the kind of person who reads scheduling syscalls for fun, you're giving main character energy and i'm obsessed 🧚

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and that's the vibe check, bestie — this page is sourced from ./kernel/sched and dated October 2026, so if you're reading it in the future, hi, hope the scheduler's treating you well 💜🫶🌸