Re: [patch 12/14] fs: dcache per-bucket dcache hash locking

[Andi Kleen]

npiggin@xxxxxxx writes:

> We can turn the dcache hash locking from a global dcache_hash_lock into
> per-bucket locking.

Per bucket locking is typically a bad idea because you get far too
many locks and you increase cache footprint with all of them. It's
typically better to use a second much smaller hash table that only has
locks (by just shifting the hash value down some more) 
Just need to be careful to avoid too much false sharing.

-Andi

-- 
ak@xxxxxxxxxxxxxxx -- Speaking for myself only.
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