LIBPFM(3)

💖 LIBPFM(3) — the Linux Programmer's Manual glow-up 💖

okay bestie, so this is a page from the Linux Programmer's Manual, and it's all about libpfm_arm_ac57 — like, the whole manual is called LIBPFM(3) but this specific entry is the Arm Cortex A57 one. sit down, grab a boba, we're doing this 🧋✨

🌸 NAME 🌸

libpfm_arm_ac57 — support for Arm Cortex A57 PMU

✨ SYNOPSIS ✨

the vibe check, in code form:

#include <perfmon/pfmlib.h>

PMU name: arm_ac57
PMU desc: ARM Cortex A57

so you slap that #include in there, and the PMU goes by the name arm_ac57, described as ARM Cortex A57. iconic. no cap. 🎀

🦋 DESCRIPTION 🦋

this library supports the ARM Cortex A57 core PMU. that's the whole thing. she's here, she's supported, she's serving 💅

the tea tho: this PMU has 6 counters and it does privilege levels filtering. and the way it can operate in both 32 and 64 bit modes? versatile queen 👑

🌈 MODIFIERS 🌈

these are the little seasoning packets you can add to ARM Cortex A57. here's every single one, no gatekeeping:

• u — measure at the user level. this corresponds to PFM_PLM3. it's a boolean modifier.
• k — measure at the kernel level. this corresponds to PFM_PLM0. it's a boolean modifier.
• hv — measure at the hypervisor level. this corresponds to PFM_PLMH. it's a boolean modifier.

three modifiers, three booleans, zero drama 🍓

👑 AUTHORS 👑

Stephane Eranian <eranian@gmail.com>

fr fr, this is LIBPFM(3) — from May, 2014 — so it's been out here thriving since way before you were even in the group chat. respect the elders, bestie 🫶💜 periodt.