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From: Ingo Oeser <ioe-lkml@rameria.de>
To: linux-kernel@vger.kernel.org
Subject: Re: large files unnecessary trashing filesystem cache?
Date: Thu, 20 Oct 2005 08:28:23 +0200
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Cc: Andrew Morton <akpm@osdl.org>, gfiala@s.netic.de
References: <200510182201.11241.gfiala@s.netic.de> <200510191754.17963.ioe-lkml@rameria.de> <20051019124927.643a0603.akpm@osdl.org>
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Hi,

On Wednesday 19 October 2005 21:49, Andrew Morton wrote:
> Ingo Oeser <ioe-lkml@rameria.de> wrote:
> > > > app which does setrlimit()+exec():
> > > >=20
> > > > 	limit-cache-usage -s 1000 my-fave-backup-program <args>
> > > >=20
> > > > Which will cause every file which my-fave-backup-program reads or w=
rites to
> > > > be limited to a maximum pagecache residency of 1000 kbytes.
> > >=20
> > > Or make it another 'ulimit' parameter...
> > Which is already there: There is an ulimit for "maximum RSS",=20
> > which is at least a superset of "maximum pagecache residency".
>=20
> RSS is a quite separate concept from pagecache.
=20
Yes I know, but the amount of pagecache which is RESIDENT for a process
is not that seperate from RSS, I think.=20

I always thought RSS is the amount of mapped and anonymous=20
pages of a process, which are in physical memory (aka resident).=20

So I consider the amount of mapped pagecache pages of=20
a process which are in physical memory (aka resident) a subset.

Or do you care about page cache pages not mapped into the process?
Is this the point I miss?

Please enlighten me :-)


Regards

Ingo Oeser


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