Re: nfs-backed mmap file results in 1000s of WRITEs per second

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On Thu, 2013-09-05 at 16:36 -0500, Quentin Barnes wrote:
> On Thu, Sep 05, 2013 at 08:02:01PM +0000, Myklebust, Trond wrote:
> > On Thu, 2013-09-05 at 14:11 -0500, Quentin Barnes wrote:
> > > On Thu, Sep 05, 2013 at 12:03:03PM -0500, Malahal Naineni wrote:
> > > > Neil Brown posted a patch couple days ago for this!
> > > > 
> > > > http://thread.gmane.org/gmane.linux.nfs/58473
> > > 
> > > I tried Neil's patch on a v3.11 kernel.  The rebuilt kernel still
> > > exhibited the same 1000s of WRITEs/sec problem.
> > > 
> > > Any other ideas?
> > 
> > Yes. Please try the attached patch.
> 
> Great!  That did the trick!
> 
> Do you feel this patch could be worthy of pushing it upstream in its
> current state or was it just to verify a theory?

It should be safe to merge this. It is a valid optimisation in the case
where there are no locks applied.

-- 
Trond Myklebust
Linux NFS client maintainer

NetApp
Trond.Myklebust@xxxxxxxxxx
www.netapp.com
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