linux-kernel - Re: 3.6.11: khubd issue SLAB related?

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Date:	Wed, 13 Mar 2013 16:36:47 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Udo van den Heuvel <udovdh@...all.nl>
cc:	Hans de Goede <hdegoede@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: 3.6.11: khubd issue SLAB related?

On Wed, 13 Mar 2013, Udo van den Heuvel wrote:

> > If not, enable it and try again, or get root and manually try to 
> > defragment memory by doing echo 1 > /proc/sys/vm/compact_memory.
> 
> This needs to be done regularly, I assume?
> 

It's done when the page allocation initially fails, so it shouldn't need 
to be done explicitly by you.  I was hoping to see if that helped to solve 
the problem and something like deferred compaction wasn't involved.

> > If so, try killing a memory hogging process to free some memory and 
> > attempt to get some higher order pages available.
> 
> It's a 8GB box (7.5GB available to software) with modest load. Mostly
> email & web browsing, some torrents, nntp stuff, etc. Nothing weird.
> Around 4.8G in buffers/cache right now.
> 

That may be true, but you only have about 300MB available at the time of 
failure.

> Why is this issue occurring?
> Why did I not see this in the past?
> 

I already added Hans to the cc to see if the struct has grown recently.
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