LIBPFM(3)

💖 LIBPFM(3) — the bestie edition 💖

ok so this is a page from the Linux Programmer's Manual, section 3, and it's all about libpfm's glow-up for one specific PMU. no cap.

✨ NAME ✨

libpfm_arm_a64fx — support for Fujitsu A64FX PMU

like, that's the whole vibe. it does one thing and it slays at it. 🎀

✨ SYNOPSIS ✨

#include <perfmon/pfmlib.h>

PMU name: arm_a64fx PMU desc: Fujitsu A64FX

✨ DESCRIPTION ✨

okay bestie, listen. the library supports the Fujitsu A64FX core PMU. that's it, that's the headline. 💅

this PMU is giving 8 counters and privilege levels filtering. and the way it can operate in 64 bit mode only?? no 32-bit era nostalgia here, we moved on, periodt. ✨

✨ MODIFIERS ✨

here are the modifiers supported on Fujitsu A64FX, and yes you need to know all of them, don't skip, i'm watching 🫶

• u — measure at the user level. this corresponds to PFM_PLM3. it's a boolean modifier, so it's giving on/off energy, no in-between. 🌸
• k — measure at the kernel level. this corresponds to PFM_PLM0. also a boolean modifier. iconic. 🔥
• hv — measure at the hypervisor level. this corresponds to PFM_PLMH. yep, boolean modifier too, they're all matching, it's a coordinated outfit. 💜

✨ AUTHORS ✨

Stephane Eranian <eranian@gmail.com> — the main character who wrote this. we stan. 👑

okay that's the whole page, tysm for reading, love u, bye!! this was May, 2020 energy, from the LIBPFM(3) era, and honestly? still hits. 💖✨🦋