cppc_get_perf(9)

📦 version 7.3.1, in nixpkgs unstable

💅 cppc_get_perf(9) — like, the Kernel API Manual page you actually wanna read

okay so bestie, welcome to cppc_get_perf(9) from the Kernel API Manual ✨ this is the little function that goes and grabs a CPU's performance controls for you, and I'm gonna walk you through it like we're texting at 2am 🫶

🎀 NAME 🎀

cppc_get_perf — literally just get a CPU's performance controls. that's the whole vibe. 💫

🌸 SYNOPSIS 🌸

int cppc_get_perf (int cpu , struct cppc_perf_ctrls *perf_ctrls );

yes queen, that's the exact signature, don't @ me 🎀

🦋 ARGUMENTS 🦋

  • cpu — the CPU whose performance controls you're trying to get 👑 like, which one do you want, bestie? pick one.
  • perf_ctrls — a ptr to cppc_perf_ctrls. see cppc_acpi.h for the deets 📄 iykyk.

✨ DESCRIPTION ✨

so here's the tea 🍓 Desired Performance is not read — it's just returned as 0. that's it. that's the whole description. no cap, that's literally the fact. 💀

🔥 RETURN 🔥

  • 0 for success, with perf_ctrls filled in 🎉 slay.
  • -ERRNO otherwise 😭 (that's the error case, obviously).

💜 SEE ALSO 💜

the whole friend group, honestly 🌈 — and the kernel file ./drivers/acpi/cppc_acpi.c is the main character here:

go read them, bestie, they're iconic 💅

ngl if you're here for the desired-perf value, it's 0. that's not a bug, that's the documented behaviour. periodt. 🎀

okay that's the whole page!! mwah 💖 this came from the ./drivers/acpi source tree, dated October 2026, and it's cppc_get_perf(9) — go forth and get those performance controls, queen 👑✨

📦 where this page comes from