irtl_2_usec(9)

okay so bestie, welcome to irtl_2_usec(9) from the Kernel API Manual — this is the little helper that turns an IRTL MSR value into microseconds, and yes it’s giving extremely niche kernel lore but stay with me 💖

🌸 NAME 🌸

irtl_2_usec — IRTL to microseconds conversion. literally that’s the whole assignment ✨

🩷 SYNOPSIS 🩷

unsigned long long irtl_2_usec (unsigned long long irtl );

🎀 ARGUMENTS 🎀

• irtl — the IRTL MSR value. that’s the value you’re handing over, bestie 🫶

🦋 DESCRIPTION 🦋

Translate the IRTL (Interrupt Response Time Limit) MSR value to microseconds. so you give it the IRTL MSR value, and it converts that into microseconds — no cap, that’s the vibe 💅

✨ SEE ALSO ✨

• Kernel file ./drivers/idle/intel_idle.c — intel_idle(9)
• intel_idle_s2idle(9)
• intel_idle_cst_usable(9)
• ivt_idle_state_table_update(9)
• bxt_idle_state_table_update(9)
• sklh_idle_state_table_update(9)
• skx_is_pc6_disabled(9)
• skx_idle_state_table_update(9)
• spr_idle_state_table_update(9)
• drop_pc6_redundant_cstates(9)
• byt_cht_auto_demotion_disable(9)
• intel_idle_cpuidle_driver_init(9)
• intel_idle_cpu_init(9)
• intel_idle_cpuidle_devices_uninit(9)
• validate_cmdline_cstate(9)
• cmdline_table_adjust(9)

signed, sealed, and delivered from ./drivers/idle, dated October 2026, filed under irtl_2_usec(9) — mwah, go read the kernel bestie 💋✨