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From: Daniel Phillips <phillips@arcor.de>
To: Rik van Riel <riel@conectiva.com.br>
Subject: Re: 2.4 kernel series and the oom_killer and /proc/sys/vm/overcommit_memory
Date: Sat, 24 Aug 2002 15:42:18 +0200
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Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Marc-Christian Petersen <m.c.p@gmx.net>, <linux-kernel@vger.kernel.org>
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On Saturday 24 August 2002 05:46, Rik van Riel wrote:
> On Sat, 24 Aug 2002, Daniel Phillips wrote:
> > On Thursday 22 August 2002 19:32, Alan Cox wrote:
> > > 3 is a totally paranoid [overcommit policy] that will require everything in
> > > ram can be dumped to swap or paged back from backing store
> >
> > How do you handle the situation where you have a lot of shared memory in a
> > half-paged-out state, so that each shared page consumes both ram and swap?
> 
> That will work fine with 'totally paranoid' mode.  There is always
> enough swap space to hold _all_ pages, so everything will just
> continue to work.

Apparently, maximum available memory is limited to

  physical memory + (swap - physical memory) = just swap

in this case, and if swap is smaller than (the potentially swappable portion
of) physical memory you might as well just turn it off.

-- 
Daniel
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