Intel Ivy Bridge "mem" events not working?

Hello,

I installed today oprofile cloning it from the git repository.

When I give the command:

$ ocount -e mem_uops_retired ./convNaive2 0.5 5

I get:

perf_event_open failed with Invalid argument
Caught runtime error while setting up counters
Internal Error.  Perf event setup failed.
Error running ocount

I get the same output for all the events starting with "mem".

When I use events that do not start with "mem", it works:
$ ocount -e l2_lines_out ./convNaive2 0.5 5
0.5,5,0.092632

Events were actively counted for 227235819 nanoseconds.
Event counts (actual) for
/home/pmousoul/Desktop/Program_Execution_Performance_Measurement_Tools/code/convNaive2:
    Event                Count                    % time counted
    l2_lines_out         255,436                  100.00

I'm I doing something wrong and I'm just not able to notice it?

My system is:
processor: i5-3337U
kernel version: 3.16.0-67-generic x86_64 GNU/Linux

I tried the oprofile-1.1.0 (tar.gz) version but I got the same results.

Now I'm thinking to test an older kernel on the same machine..

Any thoughts?


Thanks for your time,
Panos

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