linux-kernel - Re: Out of memory on 3.5 kernels

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Message-ID: <20120920073245.GA1327@schottelius.org>
Date:	Thu, 20 Sep 2012 09:32:45 +0200
From:	Nico Schottelius <nico-kernel20120920@...ottelius.org>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Nico Schottelius <nico-kernel20120920@...ottelius.org>,
	linux-kernel@...r.kernel.org
Subject: Re: Out of memory on 3.5 kernels

Hey David,

David Rientjes [Wed, Sep 19, 2012 at 11:54:54PM -0700]:
> On Thu, 20 Sep 2012, Nico Schottelius wrote:
> 
> > for some time the slab usage is quite high (~3.2 GiB) and whenever I try
> > to do a backup with ccollect (which is using rsync), a lot of processes
> > (like chromium) are being killed over night.
> > 
> 
> Yeah, over 81% of your memory is consumed by slab and that doesn't shrink 
> over the duration of the log you posted.  It would be interesting to see 
> if there was a leak somewhere: try looking at slabtop and determining if 
> you have a cache using an egregious amount of memory;

I already had to reboot, because no now process was starting / only
starting extremly slowly.

> if there aren't any 
> clear winners, then we'll still see what is hogging most of your memory 
> and see how it compares to 3.4.2.  You can also check if there is a leak 
> using kmemleak, but this requires a reboot (see 
> Documentation/kmemleak.txt).

I'll have a look at this one after the next reboot; I also have to
update to a recent kernel and enable CONFIG_DEBUG_KMEMLEAK, which is
missing in Archlinux' kernel.

Thanks for the pointers, it can only take a day until I have this
problem again - will then follow up this mail.

Cheers,

Nico

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