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From: Sven Joachim <svenjoac@gmx.de>
To: Pekka Enberg <penberg@kernel.org>
Cc: Rik van Riel <riel@redhat.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andrew Morton <akpm@linux-foundation.org>, werner <w.landgraf@ru.ru>,
        David Rientjes <rientjes@google.com>, Hugh Dickins <hughd@google.com>,
        linux-kernel@vger.kernel.org, Oleg Nesterov <oleg@redhat.com>
Subject: Re: v3.4-rc2 out-of-memory problems (was Re: 3.4-rc1 sticks-and-crashs)
References: <CA+55aFwTFXtMLhXo7g9F7uyHc3W8SCw7z1gTm9jbWXM3Nqc_ZA@mail.gmail.com>
	<20120408195044.13ea6c8e.akpm@linux-foundation.org>
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Date: Mon, 09 Apr 2012 19:19:07 +0200
In-Reply-To: <CAOJsxLE0ADd8PvXv+tGadLf3oqi-7SBNtHQsP6manoEMCDPOnA@mail.gmail.com>
	(Pekka Enberg's message of "Mon, 9 Apr 2012 20:00:17 +0300")
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On 2012-04-09 19:00 +0200, Pekka Enberg wrote:

> On Mon, Apr 9, 2012 at 7:33 PM, Rik van Riel <riel@redhat.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