Counters inaccessible using Xen

Hello,

When I attempt to profile Xen domains using Oprofile the following issue 
arises:

1. When I initially call /ophelp/, it returns the list of preformance 
counters, as expected.
2. As soon as I call /opcontrol --//init/, a subsequent call to /ophelp 
/returns "Using timer interrupt", which I cannot work further with.
As a matter of fact, any call to opcontrol using any other option (well, 
except the --help option...) causes this issue. Only passing /--deinit 
/recovers the previous state, i.e. ophelp returns the correct counter list.

Note that I am working on an Intel i7 processor, using Ubuntu 14.04 and 
Xen 4.4. I have installed Oprofile using apt-get. I was forced to 
compile Xen from source code, as I could not obtain the uncompressed Xen 
image otherwise. I already tried passing over the link to the 
uncompressed image with /--xen=/boot/xen-syms-4.4.3-pre, /with no 
success.//Please also note that Opcontrol does not complain about the 
image being invalid.

I do hope this is a standard beginner's issue and will appreciate 
greatly if someone could help me to resolve it. I will provide any 
additional information about my system if necessary.

Thank you!

Marek

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