SLUB

Linux v6.6: mm/slub.c
Linux v6.6: mm/slab_common.c
Linux v6.6: include/linux/slab.h

static __fastpath_inline
void *__kmem_cache_alloc_lru(struct kmem_cache *s, struct list_lru *lru,
			     gfp_t gfpflags)
{
	void *ret = slab_alloc(s, lru, gfpflags, _RET_IP_, s->object_size);

	trace_kmem_cache_alloc(_RET_IP_, ret, s, gfpflags, NUMA_NO_NODE);

	return ret;
}

void *kmem_cache_alloc(struct kmem_cache *s, gfp_t gfpflags)
{
	return __kmem_cache_alloc_lru(s, NULL, gfpflags);
}
EXPORT_SYMBOL(kmem_cache_alloc);

static __fastpath_inline void *slab_alloc_node(struct kmem_cache *s, struct list_lru *lru,
		gfp_t gfpflags, int node, unsigned long addr, size_t orig_size)
{
	void *object;
	struct obj_cgroup *objcg = NULL;
	bool init = false;

	s = slab_pre_alloc_hook(s, lru, &objcg, 1, gfpflags);
	if (!s)
		return NULL;

	object = kfence_alloc(s, orig_size, gfpflags);
	if (unlikely(object))
		goto out;

	object = __slab_alloc_node(s, gfpflags, node, addr, orig_size);

	maybe_wipe_obj_freeptr(s, object);
	init = slab_want_init_on_alloc(gfpflags, s);

out:
	/*
	 * When init equals 'true', like for kzalloc() family, only
	 * @orig_size bytes might be zeroed instead of s->object_size
	 */
	slab_post_alloc_hook(s, objcg, gfpflags, 1, &object, init, orig_size);

	return object;
}