STRUCT GLOBAL_PSTATE_INFO(9)

💖 NAME 💖

okay so bestie, struct global_pstate_info(9) — from the Kernel API Manual, hi — is the per policy data structure to maintain history of global pstates. That's the whole assignment, no cap. 💅

✨ SYNOPSIS ✨

       struct global_pstate_info {
           int highest_lpstate_idx;
           unsigned int elapsed_time;
           unsigned int last_sampled_time;
           int last_lpstate_idx;
           int last_gpstate_idx;
           spinlock_t gpstate_lock;
           struct timer_list timer;
           struct cpufreq_policy *policy;
        };

🫶 Members 🫶

• highest_lpstate_idx — the local pstate index from which we are ramping down. iconic.
• elapsed_time — time in ms spent in ramping down from highest_lpstate_idx.
• last_sampled_time — time from boot in ms when global pstates were last set.
• last_lpstate_idx — last set value of local pstate and global. iykyk.
• last_gpstate_idx — pstate in terms of cpufreq table index.
• gpstate_lock — a spinlock to maintain synchronization between routines called by the timer handler and governer's target_index calls. keeping that spelling exactly, bestie 🫶
• timer — is used for ramping down if cpu goes idle for a long time with global pstate held high.
• policy — associated CPUFreq policy.

🌈 SEE ALSO 🌈

Kernel file ./drivers/cpufreq/powernv-cpufreq.c — plus struct pstate_idx_revmap_data(9), calc_global_pstate(9), and gpstate_timer_handler(9). Go read those too, fr fr.

xoxo, your kernel bestie 🧚💜 — source/version: ./drivers/cpufreq; date: October 2026; this page: struct global_pstate_info(9). periodt ✨