linux-kernel - Re: LowFree/LowMem problem

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Message-Id: <20080123140639.828566dd.akpm@linux-foundation.org>
Date:	Wed, 23 Jan 2008 14:06:39 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Matthias Wolle <Matthias.Wolle@....de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: LowFree/LowMem problem

> On Mon, 21 Jan 2008 06:32:41 +0100 Matthias Wolle <Matthias.Wolle@....de> wrote:
> Hi,
> 
> my company is running several servers with kernel 2.6.23.12.  This are Dual 
> Quad Core servers (CPU Intel) with 16GB RAM using a 32Bit kernel.
> After some days nicely running the oom killer killed our processes.
> Our research discovered that the free low memory was reduced to about 11MB. We 
> found out that the decreasing of low memory is related to the count off 
> executed and ended programs.
> 
> I could reproduce the same bug on a maschine with 2GB RAM without PAE (option 
> 4GB HIGHMEM). The following code reproduces the bug.
> 
> #!/bin/sh
> 
> while [ true ]; do
> 	cat /proc/meminfo| grep LowFree
> done
> 
> Please run this script only on a test system. It reduces the low memory quite 
> fast (within minutes). 

That would be very strange.

> The latest available kernel 2.6.24-rc8 is also affected.
> 

Can you please send the full dmesg output from one such oom-killing event?

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