linux-kernel - Re: Ability to limit or disable page caching?

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Date:	Mon, 5 May 2008 11:34:24 -0700
From:	"Kevin Burton" <burtonator@...il.com>
To:	"FD Cami" <francois.cami@...e.fr>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Ability to limit or disable page caching?

>> In the mean time is it possible to disable the page cache or limit it
>> to say 10% of system memory?
>
> You might want to look at /proc/sys/vm/ for tunables.
> /proc/sys/vm/vfs_cache_pressure and /proc/sys/vm/swappiness are probably
> what you are looking for.

I haven't played with vfs_cache_pressure so I'll take a look at this.

Unfortunately, swappiness doesn't work as intended.

> See this article for an explanation of swappiness :
> http://www.leap-cf.org/oldarchive/2004-May/038622.html
>
>> You could do this with RHEL 4.x but I don't recall this ever making it
>> into 2.6 :-/
>
> AFAIK RHEL 4.x runs 2.6.9.

OK... maybe it was 3.x .. I might be getting confused with their
kernel release numbers.

Kevin

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