sys_sched_getscheduler(9)

💅 sys_sched_getscheduler — from the Kernel API Manual, bestie ✨

Okay so picture this: you're deep in the kernel, you've got a thread, and you're dying to know what scheduling class it's vibing in. That's literally this whole function. It's sys_sched_getscheduler, and it's giving "just tell me the policy, no drama" energy. 👑

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🌸 NAME 🌸

sys_sched_getscheduler — get the policy (scheduling class) of a thread. That's it. That's the whole job. 🎀

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✨ SYNOPSIS ✨

long sys_sched_getscheduler (pid_t pid );

One argument, one return value, zero games. Slay.

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🦋 ARGUMENTS 🦋

• pid — the pid in question. Like, the specific one you're curious about. Drop the pid, get the tea. 🫶

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💖 RETURN 💖

On success? You get the policy of the thread. Iconic. The main character reveal. 🌟

Otherwise? A negative error code. 😭 Not the vibe, but at least it's honest about it. Ngl, negative error codes are lowkey the most relatable thing in the kernel — sometimes you just can't.

fr fr, check for that negative value before you start celebrating. It's giving "read the room."

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💅 SEE ALSO 💅

The whole group chat, assembled. Grab a snack, this is a long guest list:

• Kernel file ./kernel/sched/syscalls.c — the source, the origin story 💀
• 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_setparam(9)
• sys_sched_setattr(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)

Basically every get has a matching set, and every scheduler function is somehow related to every other scheduler function. It's a whole ecosystem, bestie. 🌈

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Mwah 💋 — this page lives in ./kernel/sched, and it's stamped October 2026. Go forth and query those policies, queen. 👑✨