calc_global_pstate(9)

✨ NAME ✨

calc_global_pstate — calculate global pstate. This page is from the Kernel API Manual, and the full title energy is calc_global_pstate(9). Bestie, we're in the cpufreq group chat now. 💖

🌸 SYNOPSIS 🌸

int calc_global_pstate (unsigned int elapsed_time , int highest_lpstate_idx , int local_pstate_idx );

It's giving int, periodt. ✨

🎀 ARGUMENTS 🎀

• elapsed_time — elapsed time in milliseconds. Literally milliseconds, no cap. ⏱️
• highest_lpstate_idx — the pstate from which it's ramping down. 📉
• local_pstate_idx — the new local pstate. 🆕

🦋 DESCRIPTION 🦋

okay so what this function does: it finds the appropriate global pstate based on the pstate from which it's ramping down and the time elapsed in ramping down. It follows a quadratic equation — yes, math ate — and that equation ensures it reaches ramping down to pmin in 5sec. That's the whole tea. 🌈

💅 SEE ALSO 💅

• Kernel file ./drivers/cpufreq/powernv-cpufreq.c
• struct global_pstate_info(9)
• struct pstate_idx_revmap_data(9)
• gpstate_timer_handler(9)

mwah 💋 shoutout to the footer glow-up: source/version ./drivers/cpufreq, date October 2026, title calc_global_pstate(9). That's the sign-off, bestie. 🫶