pseudo_lock_measure_cycles(9)

💅 pseudo_lock_measure_cycles(9) — like, the whole kernel API manual vibe 🎀

okay so bestie, welcome to pseudo_lock_measure_cycles(9), straight outta the Kernel API Manual ✨ grab a strawberry drink 🍓 and let's get into it, because this one is honestly kinda iconic.

---

✨ NAME ✨

pseudo_lock_measure_cycles — trigger latency measure to pseudo-locked region 🦋

like, it literally goes and measures the latency for you. main character energy fr fr.

---

🌸 SYNOPSIS 🌸

int pseudo_lock_measure_cycles (struct rdtgroup *rdtgrp , int sel );

that's it, that's the whole signature, look at her go 💅

---

🎀 ARGUMENTS 🎀

• rdtgrp — the resource group to which the pseudo-locked region belongs. like, whose region are we even measuring here, ykwim? 👑
• sel — the selector of which measurement to perform on a pseudo-locked region. yes bestie, you get to pick which measurement, so choose wisely 🫶

---

💖 DESCRIPTION 💖

okay so here's the tea ☕ — the measurement of latency to access a pseudo-locked region should be done from a cpu that is associated with that pseudo-locked region. no cap, that's just how it is.

so what happens is: it determines which cpu is associated with this region, and then it starts a thread on that cpu to perform the measurement 🌈 and then it waits for that thread to complete. patient queen behavior honestly 💜

---

⭐ RETURN ⭐

• 0 on success 🎉
• <0 on failure 😭

---

🔥 SEE ALSO 🔥

kernel file ./fs/resctrl/pseudo_lock.c plus the whole friend group:

• pseudo_lock_minor_get(9)
• pseudo_lock_minor_release(9)
• region_find_by_minor(9)
• struct pseudo_lock_pm_req(9)
• pseudo_lock_cstates_constrain(9)
• pseudo_lock_region_clear(9)
• pseudo_lock_region_init(9)
• pseudo_lock_init(9)
• pseudo_lock_region_alloc(9)
• pseudo_lock_free(9)
• rdtgroup_monitor_in_progress(9)
• rdtgroup_locksetup_user_restrict(9)
• rdtgroup_locksetup_user_restore(9)
• rdtgroup_locksetup_enter(9)
• rdtgroup_locksetup_exit(9)
• rdtgroup_cbm_overlaps_pseudo_locked(9)
• rdtgroup_pseudo_locked_in_hierarchy(9)
• rdtgroup_pseudo_lock_create(9)
• rdtgroup_pseudo_lock_remove(9)

---

and that's the whole page bestie, ily, go measure some cycles 💀✨

source: ./fs/resctrl · October 2026 · pseudo_lock_measure_cycles(9) — periodt. 🧚‍♀️💅