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Date: Wed, 5 Jun 2002 14:05:52 +0300
From: Matti Aarnio <matti.aarnio@zmailer.org>
To: "Thomas 'Dent' Mirlacher" <dent@cosy.sbg.ac.at>
Cc: lkml <linux-kernel@vger.kernel.org>
Subject: Re: [rfc] "laptop mode"
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On Wed, Jun 05, 2002 at 12:02:07PM +0200, Thomas 'Dent' Mirlacher wrote:
> --snip/snip
 [snip/snip the Cc: list too..]
> > What parts of the filesystem needs to be accessed very often? I think, that placing var on a ramdisk, that is mirrored on the hd and is synced every 30 minutes, would be a good solution.
> > I think, that we should add a sysrq key to save the ramdisk to the disk. Is there a similar project, that loads an image into a ramdisk at mount, and writes it back at unmount?
> 
> a nice thing for that would be to have unionfs (al viro seems to work 
> on that?), and mount a ramdisk ontop of your var directory (or shichever
> directory is a hotspot. - or mount it over your whole harddrive, doing 
> COW on the ramdisk. and once the disk reaches a critical high-water-mark
> sync the whole set to the underlaying "real" filesystem.
> 
> any comments?

   Things like logfile appending...
   (Do I need to say more ?)

   I myself mount laptop filesystem with  noatime  option.
   Also killing cron/at helps somewhat.

> 	tm

/Matti Aarnio
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