STRUCT FUTEX_MM_PHASH(9)

💅 NAME 💅

okay so bestie, welcome to the struct futex_mm_phash(9) page in the Kernel API Manual 💖 this struct is the futex private hash related per MM data — literally the per-MM data situation for futex private hash stuff, and it’s giving very organized main character energy ✨

🦋 SYNOPSIS 🦋

       struct futex_mm_phash {
           struct mutex                    lock;
           struct futex_private_hash       *hash;
           struct futex_private_hash       *hash_new;
           unsigned long                   batches;
           struct rcu_head                 rcu;
           atomic_long_t atomic;
           unsigned int                    __percpu *ref;
        };

🎀 Members 🎀

• lock — the Mutex protecting the private hash operations, so nobody’s out here messing with them at the same time 💅
• hash — an RCU managed pointer to the private hash; it’s the main pointer bestie ✨
• hash_new — pointer to a newly allocated private hash 🦋
• batches — the batch state for RCU synchronization, keeping that sync timeline cute and accounted for 🎀
• rcu — the RCU head for call_rcu — yep, call_rcu exactly, no cap 🌈
• atomic — the aggregate value for hash_ref 💖
• ref — the per CPU reference counter for a private hash, tracking refs per CPU fr fr 👑

🌈 SEE ALSO 🌈

• Kernel file ./include/linux/futex_types.h
• struct futex_sched_data(9)
• struct futex_unlock_cs_range(9)
• struct futex_unlock_cs_ranges(9)
• struct futex_mm_data(9)

that’s the whole page, bestie 🫶 sourced from ./include/linux, dated October 2026, and filed under struct futex_mm_phash(9) — slay 💖✨