From: Goetz Bock <bock@blacknet.de>
To: ML-uml-devel <user-mode-linux-devel@lists.sourceforge.net>
Subject: Re: [uml-devel] O_DIRECT (was: Swapping directly to host swap area?)
Date: Wed, 28 Jan 2004 15:01:22 +0100 [thread overview]
Message-ID: <20040128140122.GM17709@shell.blacknet.de> (raw)
In-Reply-To: <200401280439.i0S4dMZw005517@ccure.user-mode-linux.org>
On Tue, Jan 27 '04 at 23:39, Jeff Dike wrote:
> > In the current setup, the host kernel sees this as a normal
> > write to an open file, caching it in the process and so not truly
> > freeing up the ram for a bit.
>
> This is, and this could be done by setting O_DIRECT on UML swap
> devices. That way, writes go directly (and asynchronously) to the
> device without landing in the cache.
Please bare with me, if this seams a stupid qestion, but my C skills are
pritty lacking :-(
But could we get this as an option for all ubd devices?
(I'm using Logical Volumes as base for ubd devices, and have no swap on
my hosts)
--
/"\ Goetz Bock at blacknet dot de -- secure mobile Linux everNETting
\ / (c) 2003 as GNU FDL 1.1
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next prev parent reply other threads:[~2004-01-28 14:08 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-25 23:34 [uml-devel] Swapping directly to host swap area? William Stearns
2004-01-27 3:01 ` Dan Shearer
2004-01-28 4:39 ` Jeff Dike
2004-01-28 14:01 ` Goetz Bock [this message]
2004-01-30 17:27 ` [uml-devel] O_DIRECT (was: Swapping directly to host swap area?) Jeff Dike
2004-02-05 16:59 ` [uml-devel] Swapping directly to host swap area? BlaisorBlade
2004-02-11 0:43 ` Jeff Dike
2004-02-12 19:08 ` BlaisorBlade
2004-02-12 21:36 ` Jeff Dike
2004-03-19 5:51 ` William Stearns
2004-03-19 16:58 ` Matt Ayres
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