Re: [RFC] parallel directory operations

Andreas Dilger (adilger@clusterfs.com)
Tue, 8 Jul 2003 10:22:25 -0700

On Jul 08, 2003 13:46 +0200, Andi Kleen wrote:
> On Tue, 08 Jul 2003 15:28:27 +0000 bzzz@tmi.comex.ru wrote:
> > dynlocks implements 'lock namespace', so you can lock A for namepace N1 and
> > lock B for namespace N1 and so on. we need this because we want to take lock
> > on _part_ of directory.
>
> Ok, a mini database lock manager. Wouldn't it be better to use a small hash
> table and lock escalation on overflow for this? Otherwise you could
> have quite a lot of entries queued up in the list if the server is slow.

That was my initial thought also, but the number of locks that are in
existence at one time are very small (i.e. number of threads active in
a directory at one time). Having a "more scalable" locking setup will,
I think, hurt performance for the common case.

Cheers, Andreas

--
Andreas Dilger
http://sourceforge.net/projects/ext2resize/
http://www-mddsp.enel.ucalgary.ca/People/adilger/


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