linux-kernel - Re: VM - a plenty of inactive memory

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Message-ID: <47FCCF94.3000103@isomerica.net>
Date:	Wed, 09 Apr 2008 10:15:48 -0400
From:	Dan Noe <dpn@...merica.net>
To:	Andreas Grimm <agrimm61@...il.com>
CC:	Johannes Weiner <hannes@...urebad.de>, linux-kernel@...r.kernel.org
Subject: Re: VM - a plenty of inactive memory

Andreas Grimm wrote:
> i know this. But why the kernel locks that memory for a so long time
> (2 days now)? Is there a way to enforce the reclaiming? And how can i
> find out, which process owns that memory. The problem is, that i can't
> accept, that the free memory fell down to 50MB, when i have 24GB in
> the nirvana. The system was recently very close to the awkward
> situation to swap to disk, and i bet it will do so in the next few
> days, because it happened before. Unintelligible, if one got that much
> ram.

Have you investigated the sys.vm.swappiness tunable?  It allows you to 
control how readily the kernel swaps out unused mapped memory.  This 
seems to be relevant to your issue.

See http://lwn.net/Articles/83588/

Cheers,
Dan

-- 
                     /--------------- - -  -  -   -   -
                     |  Daniel Noe
                     |  http://isomerica.net/~dpn/
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