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Re: [Xen-devel] [PATCH] Xenoprof: Enabling performance profiling in Xen

from [William Cohen]

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To:	John Levon <levon@xxxxxxxxxxxxxxxxx>
Subject:	Re: [Xen-devel] [PATCH] Xenoprof: Enabling performance profiling in Xen
From:	William Cohen <wcohen@xxxxxxxxx>
Date:	Mon, 11 Apr 2005 23:10:32 -0400
Cc:	xen-devel@xxxxxxxxxxxxxxxxxxx, "Turner, Yoshio" <yoshio_turner@xxxxxx>, "Santos, Jose Renato G \(Jose Renato Santos\)" <joserenato.santos@xxxxxx>, Aravind Menon <aravind.menon@xxxxxxx>, G John Janakiraman <john@xxxxxxxxxxxxxxxxxxx>, oprofile-list <oprofile-list@xxxxxxxxxxxxxxxxxxxxx>, William Cohen <wcohen@xxxxxxxxxx>
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John Levon wrote:

On Mon, Apr 11, 2005 at 03:37:57PM -0700, Santos, Jose Renato G (Jose Renato 
Santos) wrote:

http://lists.xensource.com/archives/html/xen-devel/2005-04/msg00256.html



Where can I get the diff against oprofile userspace source, plus a diff
of the changes to the kernel driver?

(It'd be really handy if somebody wrote up a little bit about Xen (no
idea what a domain is) for us OProfile people too)

Xen is a virtualization system. It allows multiple domains (instances ofthe OS) to run on a computer using a hypervisor. Think of a domain as aVirtual Machine in the old 360 mainframes. Thus, a physical machinecould appear to be multiple logical machines, each with a different diskimage and installation running on it.

Xen uses paravirtualization, so the kernel needs to be modified to makecalls to the hypervisor rather than directly touch hardware like thememory management unit. This is bit different than VMware which emulatesthe machine and the OS doesn't need to be modified. However, Xen hasbetter performance a a result of this. Note that user applications donot need to be modified to run on Xen. There is more information aboutXen at:


http://xen.sf.net/

Here are the start of the threads in the xen-devel mailing listdiscussing the patches to provide oprofile support:


http://lists.xensource.com/archives/html/xen-devel/2005-04/msg00256.html
http://lists.xensource.com/archives/html/xen-devel/2005-04/msg00257.html
http://lists.xensource.com/archives/html/xen-devel/2005-04/msg00259.html

-Will

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