Re: rename() contention (BUG?)

[Avi Kivity]

Al Viro wrote:
> On Thu, Oct 26, 2006 at 08:43:34PM +0200, Avi Kivity wrote:
>   
> > The changes make the mutex more efficient, but won't decrease the 
> > contention.  It seems that all renames in one filesystem are serialized, 
> > and if the renames require I/O (which is certainly the case with nfs), 
> > rename throughput is severely limited.
> >     
>
> 	They are, and for a good reason.  For details see
> Documentation/filesystems/directory-locking.
>   

Is it possible to lock only the common subtree of the two paths?

Perhaps walk towards the root of the tree, starting with the deeper 
path, locking one component at a time.  Then walk both paths together 
locking components ordered by something to avoid deadlock.

--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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