fcntl spinlock in Linux?

[Volker Lendecke]

On Wed, Jan 30, 2013 at 09:18:53AM -0500, J. Bruce Fields wrote:
> On Wed, Jan 30, 2013 at 08:32:47AM +0100, Volker Lendecke wrote:
> > On Tue, Jan 29, 2013 at 05:03:58PM -0500, J. Bruce Fields wrote:
> > > On Tue, Jan 29, 2013 at 10:51:33PM +0100, Volker Lendecke wrote:
> > > > On Tue, Jan 29, 2013 at 04:37:03PM -0500, J. Bruce Fields wrote:
> > > > > It's probably also easiest to fix.
> > > > 
> > > > Including deadlock detection? I guess this would have to
> > > > look at all locks held by a thread, possibly on different
> > > > inodes.
> > > 
> > > As a way of at least testing whether this is your problem, we could rip
> > > out the deadlock detection entirely.
> > 
> > Depending on the workload, this is partly Samba's problem.
> > Some real-world workloads imposed upon Samba make thousands
> > of smbds contend on a single lock.
> 
> By the way, do you have a way to boil any of these down into simple test
> cases that we could use?  (If it didn't even require installing Samba
> that would be ideal.)

I could send you a statically linked tdbtorture binary. It
is very easy to run that into the problems we are seeing.
Would that help?

With best regards,

Volker Lendecke

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