Optimising USERNS mapping translation.

[Aleksa Sarai]

Hi,

I'm wondering if there's a reason that we do a linear search for the
mapping translations between kuid_t and uid_t. Surely something like a
radix trie would (potentially) allow for better storage and lookup? Is
the whole "an extent fits in a cache line" a good enough optimisation
that it would be pointless to use a better structure? Also, is there a
good reason why we have UID_GID_MAP_MAX_EXTENTS = 5 (other than the
one cache line thing)? Surely it's not more efficient to have to
create a bunch of nested namespaces in order to have more than 5
extents?

-- 
Aleksa Sarai (cyphar)
www.cyphar.com
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/