get_perf_idx(9)

✨ get_perf_idx(9) ✨

okay so bestie, welcome to the Kernel API Manual 💖 this little icon is called get_perf_idx, and honestly? she does exactly what her name says: she hunts down the performance index that matches a given frequency. no cap, that's the whole gig 🎀

🌸 NAME 🌸

get_perf_idx — get the performance index corresponding to a frequency

🦋 SYNOPSIS 🦋

int get_perf_idx (struct em_perf_domain *em_pd , unsigned long freq );

💅 ARGUMENTS 💅

• em_pd — Pointer to device's Energy Model ✨ like, this is the EM she's gonna go digging around in.
• freq — frequency in kHz 💖 yes, kilohertz, keep that unit in mind bestie, do not come at her with MHz.

👑 RETURN 👑

She returns the performance index associated with the freq 🔥 — or -EINVAL if it wasn't found 😭 (that's the "girl, I looked everywhere and she's not here" answer).

🌈 SEE ALSO 🌈

Kernel file ./drivers/thermal/devfreq_cooling.c — plus these whole entire icons, go show them some love:

• struct devfreq_cooling_device(9)
• devfreq_cooling_gen_tables(9)
• of_devfreq_cooling_register_power(9)
• of_devfreq_cooling_register(9)
• devfreq_cooling_register(9)
• devfreq_cooling_em_register(9)
• devfreq_cooling_unregister(9)

lowkey a tiny function but she's main character energy in the thermal/devfreq universe 🧚✨

okay that's the whole page, mwah 💋 this icon lives in ./drivers/thermal and the manual is dated October 2026 — that's it, that's the sign-off, go forth and index some perf 🫶💜