linux-kernel - Re: [RFC][PATCH 2/9] deadlock prevention core

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Date:	Fri, 25 Aug 2006 12:47:38 +0200
From:	Pavel Machek <pavel@....cz>
To:	"Philip R. Auld" <pauld@...nera.com>
Cc:	Andrew Morton <akpm@...l.org>,
	Daniel Phillips <phillips@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	David Miller <davem@...emloft.net>, riel@...hat.com,
	tgraf@...g.ch, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, Mike Christie <michaelc@...wisc.edu>
Subject: Re: [RFC][PATCH 2/9] deadlock prevention core

Hi!

> > - We expect that the lots-of-dirty-anon-memory-over-swap-over-network
> >   scenario might still cause deadlocks.  
> > 
> >   I assert that this can be solved by putting swap on local disks.  Peter
> >   asserts that this isn't acceptable due to disk unreliability.  I point
> >   out that local disk reliability can be increased via MD, all goes quiet.
> 
> Putting swap on local disks really messes up the concept of stateless 
> servers. I suppose you can do some sort of swap encryption, but
> otherwise you need to scrub the swap partition on boot if you
> re-purpose the hardware. You also then need to do hardware
> configuration to make sure the local disks are all setup the 
> same way across all server platforms so the common images can 
> boot. 

We should really encrypt swap with random key generated at boot, for
all the machine. I believe it is possible (with some non-trivial
setup) today, but it would be nice to do it automagically.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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