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

[William Cohen <wcohen@xxxxxxxxx>]

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 of 
the OS) to run on a computer using a hypervisor. Think of a domain as a 
Virtual Machine in the old 360 mainframes. Thus, a physical machine 
could appear to be multiple logical machines, each with a different disk 
image and installation running on it.
Xen uses paravirtualization, so the kernel needs to be modified to make 
calls to the hypervisor rather than directly touch hardware like the 
memory management unit. This is bit different than VMware which emulates 
the machine and the OS doesn't need to be modified. However, Xen has 
better performance a a result of this. Note that user applications do 
not need to be modified to run on Xen. There is more information about 
Xen at:
http://xen.sf.net/

Here are the start of the threads in the xen-devel mailing list 
discussing 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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