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Date: Tue, 26 Nov 2002 12:37:32 -0700
From: Andreas Dilger <adilger@clusterfs.com>
To: Jeff Dike <jdike@karaya.com>
Cc: Andi Kleen <ak@suse.de>, linux-kernel@vger.kernel.org
Subject: Re: uml-patch-2.5.49-1
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On Nov 26, 2002  13:29 -0500, Jeff Dike wrote:
> 	design cleanliness - a UP UML is inherently single-threaded, so it's
> pointless to have many host processes when only one of them can be running.
> A host process maps much more cleanly onto a UML processor than a UML process,
> and a UML process maps much more cleanly onto a host address space than a
> host process.

How does GDB now distinguish between UML processes?  Previously, with
GDB and UML one would "det; att <host pid>" to trace another process.
Will there be equivalent functionality in the new setup?

I was just thinking about hacking the UML PID allocation code so that
the UML process PID == host process PID, so that it is easier to debug
multiple kernel threads (which are all called "kernel thread" and are
hard to align with a specific UML kernel thread).

Will SMP UML "just" be a matter of forking the host process and sharing
the /proc/mm file descriptors, along with a UML SMP scheduler and some
IPC to decide which host process is running each UML process?

Cheers, Andreas
--
Andreas Dilger
http://sourceforge.net/projects/ext2resize/
http://www-mddsp.enel.ucalgary.ca/People/adilger/

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