rm_siblings_excl_cpus(9)

📦 version 7.3.1, in nixpkgs unstable

💅 rm_siblings_excl_cpus(9) — a kernel API manual moment

okay so bestie, welcome to section 9 of the kernel API manual, where we talk about rm_siblings_excl_cpus ✨ this one lives in the kernel internals and it's lowkey iconic if you're into cpusets 🎀

🌸 NAME 🌸

rm_siblings_excl_cpus — the function that removes exclusive CPUs used by sibling cpusets 💅 like it literally goes "bestie those CPUs are taken, we're not sharing" and cleans them out of your mask 🧹✨

🦋 SYNOPSIS 🦋

int rm_siblings_excl_cpus (struct cpuset *parent , struct cpuset *cs ,
       struct cpumask *excpus );

that's the whole signature, no cap 🫶

🎀 ARGUMENTS 🎀

  • parent — the parent cpuset, aka the one holding all the siblings 👑 think of it as the group chat admin
  • cs — the current cpuset, and heads up: it gets skipped 🙈 we're not touching this one, it's main character energy
  • excpus — the exclusive effective CPU mask that we're gonna modify ✨ this is the thing getting edited, so watch it closely

💖 DESCRIPTION 💖

so here's the vibe: this function makes absolutely sure that the excpus mask you handed it does not include any CPUs that are exclusively allocated to sibling cpusets 🚫🔥

the way it does this is it walks through all the siblings of cs under parent 🚶‍♀️ and removes their exclusive CPUs from excpus one by one 💅 so by the time it's done, no sibling's exclusive CPUs are still sitting in your mask. periodt 🌟

🌈 SEE ALSO 🌈

the whole friend group, fr fr — kernel file ./kernel/cgroup/cpuset.c and these legends 👑:

okay that's the whole page bestie, go forth and cpuset responsibly 🫶💜

this gem came from ./kernel/cgroup and it's dated October 2026, brought to you by the kernel API manual — mwah, slay, bye 💋✨🍓

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