cppc_get_perf_ctrs(9)

💅 cppc_get_perf_ctrs(9) — like, the Kernel API Manual page, bestie

okay so picture this: it's a Kernel API Manual page, the function is cppc_get_perf_ctrs, and it does exactly one iconic thing — it reads a CPU's performance feedback counters. that's it. that's the whole vibe. ✨

✨ NAME ✨

cppc_get_perf_ctrs — Read a CPU's performance feedback counters. 🎀

🦋 SYNOPSIS 🦋

int cppc_get_perf_ctrs (int cpunum , struct cppc_perf_fb_ctrs
*perf_fb_ctrs );

no cap, that's the whole signature. look at it. giving very much "small function, big responsibility." 👑

🌸 ARGUMENTS 🌸

• cpunum — the CPU you're pulling counters from. like, which CPU bestie. you gotta say. 💅
• perf_fb_ctrs — a ptr to cppc_perf_fb_ctrs. and where do you find that? cppc_acpi.h, obviously. go look, i'll wait. 🫶

🔥 RETURN 🔥

0 for success with perf_fb_ctrs populated — slay, you got your data 💖 — else -ERRNO. yep, the classic negative-errno situation. it's giving "something went wrong and we're telling you in the most unix way possible." 😭

🌈 SEE ALSO 🌈

okay this list is long and honestly kind of a flex. all of these live in the kernel file ./drivers/acpi/cppc_acpi.c. iykyk ✨

• acpi_get_psd_map(9)
• cpc_ffh_supported(9)
• cpc_supported_by_cpu(9)
• pcc_data_alloc(9)
• acpi_cppc_processor_probe(9)
• acpi_cppc_processor_exit(9)
• cpc_read_ffh(9)
• cpc_read_ffh_fb_ctrs(9)
• cpc_write_ffh(9)
• cppc_get_desired_perf(9)
• cppc_get_nominal_perf(9)
• cppc_get_highest_perf(9)
• cppc_get_epp_perf(9)
• cppc_get_perf_caps(9)
• cppc_perf_ctrs_in_pcc_cpu(9)
• cppc_perf_ctrs_in_pcc(9)
• cppc_set_epp(9)
• cppc_get_auto_act_window(9)
• cppc_set_auto_act_window(9)
• cppc_get_auto_sel(9)
• cppc_set_auto_sel(9)
• cppc_set_enable(9)
• cppc_get_perf(9)
• cppc_set_perf(9)
• cppc_get_perf_limited(9)
• cppc_set_perf_limited(9)
• cppc_get_transition_latency(9)

bestie a little reminder: perf_fb_ctrs is a ptr, so make sure it points at something real before you call this. we love a valid pointer in this house. 🙈

and that's the page!! mwah 💋 — this one came from the source path ./drivers/acpi, dated October 2026, and yes the header/footer both said cppc_get_perf_ctrs(9) because consistency is hot. periodt. ⭐🍓