STRUCT RHASHTABLE_PARAMS(9)

💖 struct rhashtable_params(9) 💖

okay so bestie, welcome to struct rhashtable_params(9), fresh out of the Kernel API Manual ✨ this is the little config struct you hand over when you're building a hash table, and honestly it's giving "main character energy" for the whole rhashtable situation 🎀

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🌸 NAME 🌸

struct rhashtable_params — Hash table construction parameters 💅

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✨ SYNOPSIS ✨

struct rhashtable_params {
    u16 nelem_hint;
    u16 key_len;
    u16 key_offset;
    u16 head_offset;
    unsigned int            max_size;
    u16 min_size;
    bool insecure_elasticity;
    bool automatic_shrinking;
    rht_hashfn_t hashfn;
    rht_obj_hashfn_t obj_hashfn;
    rht_obj_cmpfn_t obj_cmpfn;
 };

like, that's the whole vibe right there 🫶

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🧩 Members 🧩

okay now the part you actually came for, member by member, no cap 🔥

• nelem_hint — a hint about how many elements you're expecting 💭 it should be 75% of desired size, so don't just yeet the full number in there, okay? 🙈
• key_len — the length of the key 📏
• key_offset — the offset of the key inside the struct that's gonna get hashed 📍
• head_offset — the offset of rhash_head inside the struct that's gonna get hashed 🎯
• max_size — the maximum size while expanding 📈
• min_size — the minimum size while shrinking 📉 (yes they're a matching set, we love symmetry 💜)
• insecure_elasticity — set to true to disable chain length checks ⚠️ bestie, the name is literally telling you it's insecure, so proceed with intention, fr fr 😭
• hashfn — the hash function 🧚 default is jhash2 if !(key_len % 4), or jhash — that's the whole conditional, no notes ✨
• obj_hashfn — function to hash the object 🍓
• obj_cmpfn — function to compare a key with an object 🎀

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🔍 SEE ALSO 🔍

go read these next, iykwup (you know what's up, bestie) 👑

• Kernel file ./include/linux/rhashtable-types.h struct rhashtable_compare_arg(9), struct rhashtable(9), struct rhltable(9), struct rhashtable_walker(9), struct rhashtable_iter(9) 🌈

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💀 lowkey important reminder: insecure_elasticity disables chain length checks. that's a real security thing, not a cute vibe. don't say i didn't warn you 🫶

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and that's the page, bestie!! no crumbs left 🌸 this little icon came from the kernel tree at ./include/linux, dated October 2026, and it's filed under struct rhashtable_params(9) — slay, go build a hash table, periodt 💅👑