From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jacob Gorm Hansen <jacobg@diku.dk>
Subject: Re: address space reorganization
Date: Wed, 13 Apr 2005 19:18:28 -0700
Message-ID: <425DD2F4.7070400@diku.dk>
References: <20050413175940.GA17666@bytesex>	<5bf6d41cfb5c053d0265b190a37fa795@cl.cam.ac.uk>
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To: Keir Fraser <Keir.Fraser@cl.cam.ac.uk>
Cc: xen-devel@lists.xensource.com, Gerd Knorr <kraxel@bytesex.org>
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Keir Fraser wrote:

> We need generally to think about how flexible we want to be in allowing 
> migration between different machine configurations. Shoudl we require 
> identical h/w specs, or allow differences in I/O devices, CPU and/or 
> memory? We will already have to be careful about downgrading cpu specs 
> when we migrate (e.g., Linux locks onto using multimedia instructions 
> for software raid that are unavailable post-migrate).

Why not treat the functions that use special mm-instructions (like the 
software RAID code) as critical sections that cannot overlap with 
migration, and then have the guestOS re-calibrate its use of these 
features upon arrival?

[ insert standard plug of self-migration here :-) ]

Jacob