Xen users - Nov 2006 - xenoprof: daemon returned Bad address on DomU

Hi,

I followed the instructions from the user guide in XenoProf to setup a 
multidomain profiling session, but when I tried to do opcontrol --start on 
the DomU, i get back:

Using 2.6+ OProfile kernel interface.
Reading module info.
Failed to open profile device: Bad address

It looks like the function op_open_device("/dev/oprofile/buffer")
in oprofile/daemon/init.c is returning EFAULT. I checked and that file 
exists, I don''t know why this is an address out of range problem.

XenOprof seems to be working fine on Dom0 however. The DomU guest is using 
the same kernel image as the Dom0. The oprofile module loaded fine, I just 
can''t seem to launch the oprofile daemon.

The guest partition is a file backed partition and not the a real physical 
partition in case this has to do with anything.

Any magical incantation would be greatly appreciated.

I''m using xen-3.0.3-unstable and linux-2.6.16.29-xen kernel for guest
and
Dom0.

Thanks,
Mike

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