STRUCT EM_PERF_TABLE(9)

✨ NAME ✨

okay so bestie, we're looking at struct em_perf_table — literally the performance states table 💅 and yes, this is struct em_perf_table(9) from the Kernel API Manual, section 9. no cap, that's the whole name vibe 🎀

🌸 SYNOPSIS 🌸

the struct itself is giving exactly this, bestie:

struct em_perf_table {
    struct rcu_head rcu;
    struct kref kref;
    struct em_perf_state state[];
};

🫶 Members 🫶

• rcu — the RCU used for safe access and destruction. it's doing the quiet background safety work, iconic behavior honestly 🧚
• kref — the reference counter that tracks the users. keeping tabs on everybody, lowkey main character energy 👑
• state — the list of performance states, in ascending order. not chaotic, not shuffled, just ascending. periodt ✨

🔥 SEE ALSO 🔥

Kernel file: ./include/linux/energy_model.h — and the whole friend group is:

• struct em_perf_state(9)
• struct em_perf_domain(9)
• em_pd_get_efficient_state(9)
• em_cpu_energy(9)
• em_pd_nr_perf_states(9)
• em_perf_state_from_pd(9)

and that's the page, bestie 🦋 source is ./include/linux, dated October 2026, and the whole thing is filed under struct em_perf_table(9) — slay, go read the kernel, ily 💖