linux-kernel - Re: v3.4-rc2 out-of-memory problems (was Re: 3.4-rc1 sticks-and-crashs)

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Date:	Mon, 09 Apr 2012 19:19:07 +0200
From:	Sven Joachim <svenjoac@....de>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	Rik van Riel <riel@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	werner <w.landgraf@...ru>, David Rientjes <rientjes@...gle.com>,
	Hugh Dickins <hughd@...gle.com>, linux-kernel@...r.kernel.org,
	Oleg Nesterov <oleg@...hat.com>
Subject: Re: v3.4-rc2 out-of-memory problems (was Re: 3.4-rc1 sticks-and-crashs)

On 2012-04-09 19:00 +0200, Pekka Enberg wrote:

> On Mon, Apr 9, 2012 at 7:33 PM, Rik van Riel <riel@...hat.com> wrote:
>>> Attaching these files, since I can't really make anything out of the
>>> latter.  Note that I started a few memory hogs (X, Firefox, Emacs with
>>> Gnus), so overall memory footprint has grown to 768 MB.
>>
>> Looks like the "missing" 400MB is all in filesystem caches,
>> specifically the dentry cache, the ext4 inode cache and
>> buffer heads.
>>
>> That is perfectly fine, since those caches will be shrunk
>> when the system needs memory.
>
> CONFIG_SLUB, right?

Actually, no.  For some reason (probably historical…) I have CONFIG_SLAB.

> It will merge caches so you don't necessarily see
> leaks in /proc/slabinfo. You can use "slub_nomerge" kernel parameter
> to disable the merging.

Cheers,
       Sven
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