linux-kernel - Re: OOM-killer and strange RSS value in 3.9-rc7

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Date:	Wed, 24 Apr 2013 15:36:20 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Michal Hocko <mhocko@...e.cz>
cc:	Han Pingtian <hanpt@...ux.vnet.ibm.com>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: OOM-killer and strange RSS value in 3.9-rc7

On Wed, 24 Apr 2013, Michal Hocko wrote:

> [CCing SL.B people and linux-mm list]
>
> Just for quick summary. The reporter sees OOM situations with almost
> whole memory filled with slab memory. This is a powerpc machine with 4G
> RAM.

Boot with "slub_debug" or enable slab debugging.

> /proc/slabinfo shows that almost whole slab occupied memory is on

Please enable debugging and look at where these objects were allocated.

> It is not clear who consumes that memory and the reporter claims this is
> vanilla 3.9-rc7 kernel without any third party modules loaded. The issue
> seems to be present only with CONFIG_SLUB.

cat /sys/kernel/slab/kmalloc-*/alloc_calls

will show where these objects are allocated.

A dump of the other fields in /sys/kernel/slab/kmalloc*/* would also be
useful.


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