Re: vfsmount lock issues on very large ppc64 box
From: Eric Dumazet
Date: Mon Jul 18 2011 - 04:17:33 EST
Le dimanche 17 juillet 2011 Ã 10:46 +0200, Andi Kleen a Ãcrit :
> On Sat, Jul 16, 2011 at 07:04:28PM -0600, Matthew Wilcox wrote:
> > On Sun, Jul 17, 2011 at 10:50:27AM +1000, Anton Blanchard wrote:
> > > Looking closer, all of these calls are in pipefs and sockfs.
> > > Since we never mount either filesystem they never get a long term
> > > reference and we always end up in the very slow write brlock path
> > > that takes a lock for each online CPU.
> > >
> > > Here is a quick hack that takes a long term reference on pipefs
> > > and sockfs which fixes the problem. Any thoughts on how we should
> > > fix it properly?
> > I know Tim and Andi have been looking into this ... I forget what their
> > fix was though.
> Tim posted a patch, but it wasn't applied for unknown reasons.
Could Tim respin his patch then ?
This problem hits even a two sockets machine.
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