linux-kernel - Re: 2.6.29.1: nfsd: page allocation failure

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Message-ID: <alpine.DEB.2.00.0906171335590.4786@chino.kir.corp.google.com>
Date:	Wed, 17 Jun 2009 13:39:52 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Michael Tokarev <mjt@....msk.ru>
cc:	"J. Bruce Fields" <bfields@...ldses.org>,
	Justin Piszcz <jpiszcz@...idpixels.com>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.29.1: nfsd: page allocation failure - nfsd or kernel
 problem?

On Thu, 18 Jun 2009, Michael Tokarev wrote:

> > 	http://bugzilla.kernel.org/show_bug.cgi?id=13518
> 
> Does not look similar.
> 
> I repeated the issue here.  The slab which is growing here is buffer_head.
> It's growing slowly -- right now, after ~5 minutes of constant writes over
> nfs, its size is 428423 objects, growing at about 5000 objects/minute rate.
> When stopping writing, the cache shrinks slowly back to an acceptable
> size, probably when the data gets actually written to disk.
> 

Not sure if you're referring to the bugzilla entry or Justin's reported 
issue.  Justin's issue is actually allocating a skbuff_head_cache slab 
while the system is oom.

> It looks like we need a bug entry for this :)
> 
> I'll re-try 2.6.30 hopefully tomorrow.
> 

You should get the same page allocation failure warning with 2.6.30.  You 
may want to try my patch in http://lkml.org/lkml/2009/6/17/437 which 
suppresses the warnings since, as you previously mentioned, there are no 
side effects and the failure is easily recoverable.
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