RE: [Xen-devel] Revisiting the Xenoprof problem

["Santos, Jose Renato G" <joserenato.santos@xxxxxx>]

Are you able to profile dom0 alone?
I suggest that you try this first.
Then try using passive domain profiing which enables guest profiling but does 
not require running oprofile in domU. It is much simpler and easier to use. 
Take a look at  http://www.xen.org/files/summit_3/xenoprof_tutorial.pdf for a 
xenoprof tutorial. It is a little old but it should be usefull (mostly the xen 
and oprofile versions have changed since then; otherwise everything still 
applies)

Renato

> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of
> Venkataraman, Meenakshi
> Sent: Wednesday, November 14, 2007 9:32 AM
> To: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-devel] Revisiting the Xenoprof problem
>
> Hi all,
>
> There was a discussion previously on oprofile not working in Dom U.
> Oprofile prints the following message and exits.
>
> -------- snip -----------
>
> Using default event: CPU_CLK_UNHALTED:100000:0:1:1 Using 2.6+
> OProfile kernel interface.
> Reading module info.
> Failed to open profile device: Operation not permitted
> Couldn't start oprofiled.
> Check the log file "/var/lib/oprofile/oprofiled.log" and kernel syslog
>
> -------- snip -----------
>
> There was an email exchange a year ago on the same problem. (see here:
> http://lists.xensource.com/archives/html/xen-devel/2006-05/msg
01168.html
> )
>
>
> I've followed the sequence of steps mentioned in the thread,
> and yet I get the same problem. I'm starting the daemon in
> Dom0 before I start oprofile in the guest.
>
> Thoughts and/or solutions, anyone?
>
> Thanks in advance!
> Meenakshi
>
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