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Thu Jan 11 17:39:53 PST 2007
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From: Bill Huey (hui) <billh at 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 at apollo.backplane.com> <ea7b9c170701101642m48a56e8byf3014fe3ed04061e at mail.gmail.com> <20070111024457.55cc5a7e.bastyaelvtars at gmail.com> <49195.192.168.0.252.1168489103.squirrel at www.shiningsilence.com> <200701111859.l0BIxdDQ094385 at apollo.backplane.com> <20070111231614.GA30442 at gnuppy.monkey.org> <200701120041.l0C0fYDK097057 at apollo.backplane.com> <20070112005155.GA31215 at gnuppy.monkey.org> <20070112005352.GA31560 at 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
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