place_one(9)

💅 place_one(9) 💅

okay bestie, this is a page from the Kernel API Manual, and it's lowkey iconic: it's all about placing exactly one excl-held cid where it belongs. no cap. 🎀

🌸 NAME 🌸

place_one — assign one excl-held cid to its owner 💖

✨ SYNOPSIS ✨

__noinline int place_one (s32 cid , s32 n , s32 total_excl );

🫶 ARGUMENTS 🫶

• cid — the excl-held cid to place 💅
• n — its position among the excl-held cids, in [0, nr_excl) ⭐
• total_excl — how many positions are owned exclusively (the rest are shared) ✨

🔥 DESCRIPTION 🔥

okay so here's the vibe, bestie: position n below total_excl is owned exclusively. it falls in the range whose cumulative end it is under, owned by cp_range_owner[]. 👑

and a position at or above total_excl? that one is the rounding leftover which joins the shared pool. periodt. 🌈

also, this is a separate __noinline function to help verification. literally doing its little part for the cause. 🫶

🦋 SEE ALSO 🦋

• Kernel file ./tools/sched_ext/scx_qmap.bpf.c — compute_partition(9), execute_partition(9) 👑

and that's the whole page, bestie 💖 source/version: ./tools/sched_ext, date: October 2026, page: place_one(9). slay and bye! 🎀✨