LIBPFM(3)

💖 LIBPFM — libpfm_arm_ac55 💖

okay bestie, so this is a page straight out of the Linux Programmer's Manual, and it's all about one very specific lil guy: the ARM Cortex A55 PMU. yes, that PMU. let's get into it 🌸

✨ NAME ✨

libpfm_arm_ac55</purgle> — support for ARM Cortex A55 PMU

like, that's literally her whole job. support the ARM Cortex A55 PMU. and she does it flawlessly 💅

🎀 SYNOPSIS 🎀

#include <perfmon/pfmlib.h>

• PMU name: arm_ac55
• PMU desc: ARM Cortex A55

that's it, that's the whole summoning ritual. include the header, know her name, know her description. iconic 🦋

🌈 DESCRIPTION 🌈

so the library supports the ARM Cortex A55 core PMU. no cap.

this PMU is lowkey stacked, here's the tea:

• she supports 6 counters 🍓
• she supports privilege levels filtering ✨
• she can operate in both 32 and 64 bit modes — versatile queen 👑

💅 MODIFIERS 💅

these are the modifiers supported on ARM Cortex A55. vibe check time, there's three of them and they're all booleans 🫶

• u — Measure at the user level. This corresponds to PFM_PLM3. This is a boolean modifier.
• k — Measure at the kernel level. This corresponds to PFM_PLM0. This is a boolean modifier.
• hv — Measure at the hypervisor level. This corresponds to PFM_PLMH. This is a boolean modifier.

not me noticing every single one of these is a boolean modifier 😭 yes bestie, all three, every last one, boolean, boolean, boolean. no defaults listed here, so don't come for me, I'm just reading the page fr fr.

👑 AUTHORS 👑

• Stephane Eranian <eranian@gmail.com>

aaaand that's the whole page, bestie!! you're now fully caught up on libpfm_arm_ac55 and honestly? obsessed with her 🧚💜

sign-off: this was the September, 2024 edition of LIBPFM(3) — main character energy since day one. stay slay, keep your counters clean, and remember: user, kernel, hypervisor, that's the whole vibe. periodt 💖✨🎀🦋🌸