LIBPFM(3)

💖 LIBPFM 💖

okay bestie, so this is libpfm_intel_ivbep_unc_irp from the Linux Programmer's Manual, and yes she's a niche one but she EATS 💅

✨ NAME ✨

libpfm_intel_ivbep_unc_irp — the girl who handles support for the Intel Ivy Bridge-EP IRP uncore PMU 🎀

🌸 SYNOPSIS 🌸

#include <perfmon/pfmlib.h>

• PMU name: ivbep_unc_irp
• PMU desc: Intel Ivy Bridge-EP IRP uncore PMU

🦋 DESCRIPTION 🦋

so basically, this library supports the Intel Ivy Bridge uncore PMU ✨ and here's the tea: this PMU model only exists on Ivy Bridge model 62. like, that's it, that's the only place you'll find her. no cap. 💀

👑 MODIFIERS 👑

the following modifiers are supported on the Intel Ivy Bridge IRP uncore PMU, and bestie you're gonna want to know these fr fr:

• e — turns on edge detection, meaning it counts only when there's a state transition from zero occurrences of the event to at least one occurrence. ⚡ big glow-up moment. but listen: this modifier must be combined with a threshold modifier (t) with a value greater or equal to one. it's a boolean modifier 🫶
• t — sets the threshold value. when you set it to a non-zero value, the counter counts the number of cycles in which the number of occurrences of the event is greater or equal to the threshold. 🌈 it's an integer modifier with values in the range [0:255]. periodt. 💅

ngl, if you're using e without t set to ≥ 1, you're doing it wrong — they're a package deal, iykyk 💖

💜 AUTHORS 💜

Stephane Eranian <eranian@gmail.com> — thank you for your service king 🫡👑

and that's the whole vibe, bestie 💖 this one's from February, 2014, part of the LIBPFM(3) era, chillin' in the Linux Programmer's Manual — slay, iconic, no notes 🎀✨🦋