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SubjectRe: rename() contention (BUG?)
On Thu, Oct 26, 2006 at 11:19:56PM +0200, Avi Kivity wrote:
> 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.

Please, read the file mentioned above.
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