arch_scale_cpu_capacity(9)

💅 arch_scale_cpu_capacity(9) 💅

okay bestie, welcome to the Kernel API Manual page for arch_scale_cpu_capacity — yes, we're getting into CPU capacity scale factors and it's gonna be iconic ✨

---

✨ NAME ✨

arch_scale_cpu_capacity — get the capacity scale factor of a given CPU. That's the whole assignment, no cap. 💖

🦋 SYNOPSIS 🦋

unsigned long arch_scale_cpu_capacity (int cpu );

🎀 ARGUMENTS 🎀

• cpu — the CPU in question. Like, which CPU are we talking about? That one. 👑

🌸 RETURN 🌸

You get the CPU scale factor normalized against SCHED_CAPACITY_SCALE, i.e. the formula down in DESCRIPTION. Normalized, bestie — that's the vibe. ✨

🔥 DESCRIPTION 🔥

Here's the actual shape of it, no cap:

max_perf(cpu) ----------------------------- * SCHED_CAPACITY_SCALE
max(max_perf(c) : c in CPUs)

It's giving "compare this CPU's max_perf(cpu) against the max max_perf(c) across all CPUs in CPUs, then scale it by SCHED_CAPACITY_SCALE." The formula ate and left no crumbs 💅

🌈 SEE ALSO 🌈

• Kernel file ./include/linux/sched/topology.h — go peek, iykyk 🫶

---

xoxo, your girl 💖 — source/version: ./include/linux/sched; dated October 2026; manual page: arch_scale_cpu_capacity(9) — periodt 💅✨