Now, I have a trouble to run oprofile, especially opcontrol command, on a VM running on a XEN-based virtualized system.
If I run opcontrol command with an event option, such as LLC_MISSES, then the command prints errors like followings.
# opcontrol -e LLC_MISSES:10000
You cannot specify any performance counter events
because OProfile is in timer mode.
However, if I run the command on same native system (same H/W, but without Xen Hypervisor), it is possible to run the command.
I don't know why the command runs or not. :(
My Xen version is 4.3.2-pre.
Linux Kernel version is 3.10.20.