On September 15, 2015 7:35:45 AM CDT, Aleksa Sarai <[email protected]> wrote: >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?
Is this a homework question? It sounds like one. If you need more than about two extents you are managing your uids very badly. As for the nested namespaces and 5 extents limit. I will let you read the code and think about that one. Eric -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
