recording rapl/power events

[Adrien BAK <adrien.bak@metascale.org>]

Hi everyone,

I am looking into the power (rapl) events introduced in the kernel in 
version 3.14.

Right now, I can access those events through perf stat :

perf stat -a -e power/energy-pkg/ sleep 1

  Performance counter stats for 'system wide':

              17.16 Joules power/energy-pkg/

        1.002808169 seconds time elapsed

However, it seems that I can't record a sequence of power events :

perf record -a -e power/energy-pkg/ sleep 1
Error:
The sys_perf_event_open() syscall returned with 22 (Invalid argument) 
for event (power/energy-pkg/).
/bin/dmesg may provide additional information.
No CONFIG_PERF_EVENTS=y kernel support configured?

dmesg does not give any information, and, as far as I know, perf_events 
are fully supported by my kernel (

Is there some limitation of the power events (or kernel support) I am 
unaware of that could explain this behaviour, or is there something 
wrong with my setup/configuration ?
How would one procede to record a sequence of power events ?

Thanks in advance
A.