Re: [RFC] parallel directory operations

[Andreas Dilger]

On Jul 08, 2003  13:46 +0200, Andi Kleen wrote:
> On Tue, 08 Jul 2003 15:28:27 +0000 [e-mail] 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/