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From: Bill Huey (hui) <billh@gnuppy.monkey.org>
Subject: Re: VKernel progress update - 9 Jan 2006
Date: Thu, 11 Jan 2007 17:35:08 -0800
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References: <200701101825.l0AIPQwU083929@apollo.backplane.com> <ea7b9c170701101642m48a56e8byf3014fe3ed04061e@mail.gmail.com> <20070111024457.55cc5a7e.bastyaelvtars@gmail.com> <49195.192.168.0.252.1168489103.squirrel@www.shiningsilence.com> <200701111859.l0BIxdDQ094385@apollo.backplane.com> <20070111231614.GA30442@gnuppy.monkey.org> <200701120041.l0C0fYDK097057@apollo.backplane.com> <20070112005155.GA31215@gnuppy.monkey.org> <20070112005352.GA31560@gnuppy.monkey.org> <200701120121.l0C1LQdI097380
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On Thu, Jan 11, 2007 at 05:21:26PM -0800, Matthew Dillon wrote:
>     But I still have not found a good technical description of what they
>     are doing.  Are they actually using ptrace to manipulate dummied
>     up processes in the real kernel to shadow the emulated processes
>     in the UML?  That sounds pretty wasteful.  But that was described in
>     2002.
> 
>     I feel kinda sheepish.  I've only spent two months doing the DragonFly
>     V-kernel and it never felt like a big deal to me.  Just grunt work.
>     The linux folks seem to have a whole site revolving around UML and
>     even a book!  A book!  Who has time to write a book?

Yeah, heh, most of the initial interest in UML was for file systems
development so that they didn't have to restart all of time, etc...

KVM is a recent addition to the Linux kernel and I expect that to
overtake Xen in a rather short amount of time since there's a lot of
effort behind it using those virtualization mechanisms in AMD/Intel
processors. MMU issues are a hell. I'm sorry I don't have an more
specifics.

	http://lwn.net/Articles/207875/

This is different than your use for dfBSD VFS development. Congrads
on VKernel BTW. :)

bill