LIBPFM(3)

📦 version 4.13.0+git106-g3e4031b, in debian trixie, ubuntu questing, ubuntu resolute, ubuntu stonking

💖 LIBPFM(3) 💖

okay bestie, this is a page from the Linux Programmer's Manual, and it's all about libpfm_arm_ac72 — yes, that's the whole vibe, it's giving "one specific Arm core and its performance monitoring unit". sit with me, it's short and it's slay 🎀

✨ NAME ✨

libpfm_arm_ac72 — support for Arm Cortex A72 PMU

🌸 SYNOPSIS 🌸

#include <perfmon/pfmlib.h>
PMU name: arm_ac72
PMU desc: ARM Cortex A72

🦋 DESCRIPTION 🦋

So this library, right, it supports the ARM Cortex A72 core PMU. That's it, that's the whole thing, main character energy 💅

This PMU supports 6 counters and privilege levels filtering — so you can pick and choose who you're measuring, which is honestly so iconic of it. And it can operate in both 32 and 64 bit modes. Versatile queen 👑

💅 MODIFIERS 💅

Here are the modifiers supported on ARM Cortex A72. Read them, learn them, love them:

  • 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. 🧚
ngl the pattern here is chef's kiss: each modifier maps to exactly one PFM_PLM* value, and every single one of them is boolean. no surprises, no drama, just vibes 🌈

👑 AUTHORS 👑

Stephane Eranian <eranian@gmail.com>

and that's the whole page fr fr 🫶 this one came from the LIBPFM(3) manual, dated September, 2024, and it lives in the Linux Programmer's Manual. bye bestie, go count some counters 💖🌸🦋

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