SLAB_HWCACHE_ALIGN(9)

💅 SLAB_HWCACHE_ALIGN — like, the Linux kernel API manual, bestie ✨

okay so real talk, this is a page from the Kernel API Manual and honestly? it's a little baby page but it's doing a LOT. let's get into it 🫶

---

✨ NAME ✨

SLAB_HWCACHE_ALIGN — aligns your objects on cache line boundaries. that's it. that's the whole vibe. 🎀

---

🌸 SYNOPSIS 🌸

SLAB_HWCACHE_ALIGN

no args, no drama, she's just a flag. periodt. 💅

---

🦋 DESCRIPTION 🦋

okay so here's the tea ☕ — sufficiently large objects get aligned on a cache line boundary. iconic behavior, no notes.

but it gets cuter. if your object size is smaller than a half of the cache line size, then the alignment drops down to half of the cache line size. she's being flexible, she's matching your energy 💖

and it's a whole general rule, not just a one-off: if the object size is smaller than 1/2^n of the cache line size, the alignment gets adjusted to 1/2^n. like, she keeps halving until it fits. the way she just knows the math 😭✨

and if you ALSO ask for explicit alignment through the respective struct kmem_cache_args field? no fighting, no beef — the greater of both alignments is the one that gets applied. biggest wins, queen behavior 👑🔥

---

🌈 SEE ALSO 🌈

grab a snack, this list is long and she's thriving 🍓

• Kernel file ./include/linux/slab.h
• SLAB_TYPESAFE_BY_RCU(9)
• SLAB_ACCOUNT(9)
• SLAB_RECLAIM_ACCOUNT(9)
• struct kmem_cache_args(9)
• kmem_cache_create_usercopy(9)
• kmem_cache_create(9)
• krealloc_node_align(9)
• kmem_cache_alloc(9)
• kmem_cache_charge(9)
• kmalloc(9)
• kmalloc_nolock(9)
• __alloc_objs(9)
• __alloc_flex(9)
• kmalloc_obj(9)
• kmalloc_objs(9)
• kmalloc_flex(9)
• kmalloc_array(9)
• krealloc_array(9)
• kcalloc(9)
• kzalloc(9)
• kvmalloc_node(9)
• kvrealloc_node_align(9)
• kmalloc_size_roundup(9)

like, go read literally all of them, iykyk 💀🧚

---

lowkey a flex that this whole thing lives in ./include/linux, if you were wondering where to find her 🏠

and that's the whole page bestie!! mwah 💋 this one came straight out of ./include/linux, dated October 2026, and it's filed under SLAB_HWCACHE_ALIGN(9) — slay, go align something 🎀✨💜