Date: Mon, 27 Sep 2004 10:35:54 -0300
From: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
To: jonathan@jonmasters.org
Cc: Lars Marowsky-Bree <lmb@suse.de>, Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Thomas Habets <thomas@habets.pp.se>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] oom_pardon, aka don't kill my xlock
Message-ID: <20040927133554.GD30956@logos.cnet>
References: <200409230123.30858.thomas@habets.pp.se> <20040923234520.GA7303@pclin040.win.tue.nl> <1096031971.9791.26.camel@localhost.localdomain> <200409242158.40054.thomas@habets.pp.se> <1096060549.10797.10.camel@localhost.localdomain> <20040927104120.GA30364@logos.cnet> <20040927125441.GG3934@marowsky-bree.de> <35fb2e590409270612524c5fb9@mail.gmail.com>
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On Mon, Sep 27, 2004 at 02:12:26PM +0100, Jon Masters wrote:
> Hi all,
> 
> Just out of interest then...suppose we've got a loopback swap device
> and that we can extend this by creating a new file or extending
> somehow the existing one.
> 
> What would be wrong with having the page reclaim algorithms use one of
> the low memory watermarks as a trigger to call in to userspace to
> extend the swap available if possible? This is probably what Microsoft
> et al do with their "Windows is extending your virtual memory, yada
> yada blah blah". Comments? Already done?

You dont to change kernel code for that - make a script to monitor 
swap usage, as soon as it gets below a given watermark, you swapon 
whatever swapfile you want.

Makes sense yes.

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