> An unlikely branch is used to make sure this case does not affect
> performance in the usual slab_free path.
>
> The slab allocator has a time based reaper that would eventually get rid
> of the objects, but we can also call it explicitly, since dead caches
> are not a likely event.
This is also something that could be done from slab_common since all
allocators have kmem_cache_shrink and kmem_cache_shrink can be used to
drain the caches and free up empty slab pages.
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