LIBPFM(3)

💖 LIBPFM(3) — bestie edition 💖

okay so like, hi, this is a page from the Linux Programmer's Manual, and it's all about one very specific little slice of the libpfm family. it's libpfm_arm_ac7, which is support for Arm Cortex A7 PMU. that's the whole thing. that's the assignment. let's get into it ✨

✨ NAME ✨

libpfm_arm_ac7 — support for Arm Cortex A7 PMU 🎀

🦋 SYNOPSIS 🦋

#include <perfmon/pfmlib.h>

• PMU name: arm_ac7
• PMU desc: ARM Cortex A7

🌸 DESCRIPTION 🌸

so basically the library supports the ARM Cortex A7 core PMU. that's its whole job and it does it 💅

this PMU supports 4 counters and privilege levels filtering. four counters!! counting things!! at different privilege levels!! iconic behavior honestly 👑

🌈 MODIFIERS 🌈

these are the modifiers supported on ARM Cortex A7, bestie, and there are exactly three, so like, no skipping:

• u — measure at the user level. this corresponds to PFM_PLM3. it's a boolean modifier. (so it's just on or off, no in-between, very demure)
• k — measure at the kernel level. this corresponds to PFM_PLM0. also a boolean modifier.
• hv — measure at the hypervisor level. this corresponds to PFM_PLMH. yep, you guessed it, boolean modifier.

three booleans, three privilege levels, zero drama. the vibe check passed 🫶

👑 AUTHORS 👑

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

and that's the page!! it's giving Linux Programmer's Manual, LIBPFM(3), August, 2012 — shoutout to that source and date, they carried the whole footer. bye bestie, go count some events 😭💖🌸