Date: Tue, 8 May 2012 09:02:46 -0500 (CDT)
From: Christoph Lameter <cl@linux.com>
To: =?ISO-8859-2?Q?Robert_=A6wi=EAcki?= <robert@swiecki.net>
cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: mmap/clone returns ENOMEM with lots of free memory
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On Mon, 7 May 2012, Robert =C5=9Awi=C4=99cki wrote:

> Yup (btw: I attached dump of some proc files and some debug commands
> in the original e-mail - can be found here
> http://marc.info/?l=3Dlinux-kernel&m=3D133640623421007&w=3D2 in case some
> MTA removed them)
>
> CommitLimit:     1981528 kB
> Committed_AS:    1916788 kB
>
> just not sure if Committed_AS should present this kind of value. Did I
> just hit a legitimate condition, or may it suggest a bug? I'm a bit
> puzzled cause

This is a legitimate condition. No bug.
>
> root@ise-test:/proc# grep Mem /proc/meminfo
> MemTotal:        3963060 kB
> MemFree:         3098324 kB

Physical memory is free in quantity but virtual memory is exhausted.

> Also, some sysctl values:
> vm.overcommit_memory =3D 2
> vm.overcommit_ratio =3D 50

Setting overcommit memory to 2 means that the app is strictly policed
for staying within bounds on virtual memory. Dont do that.

See linux source linux/Documentation/vm/overcommit-accounting for more
details.


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