No subject

Unknown Unknown
Thu Jan 11 17:39:53 PST 2007


@apollo.backplane.com>
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
BestServHost: crater.dragonflybsd.org
List-Post: <mailto:kernel at crater.dragonflybsd.org>
List-Subscribe: <mailto:kernel-request at crater.dragonflybsd.org?body=subscribe>
List-Unsubscribe: <mailto:kernel-request at crater.dragonflybsd.org?body=unsubscribe>
List-Help: <mailto:kernel-request at crater.dragonflybsd.org?body=help>
List-Owner: <mailto:owner-kernel at crater.dragonflybsd.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
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
@apollo.backplane.com>
In-Reply-To: <200701120121.l0C1LQdI097380 at apollo.backplane.com>
Sender: kernel-errors at crater.dragonflybsd.org
Errors-To: kernel-errors at crater.dragonflybsd.org
Lines: 28
NNTP-Posting-Host: 216.240.41.25
X-Trace: 1168566184 crater_reader.dragonflybsd.org 833 216.240.41.25
Xref: crater_reader.dragonflybsd.org dragonfly.kernel:10428

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






More information about the Kernel mailing list