On 21/04/2014 23:07, Vince Weaver wrote:
On Mon, 21 Apr 2014, Adrien BAK wrote:
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?
RAPL events cannot generate interrupts, so I don't think you can sample
like this.
You can possibly sample using some other event (like one of the software
clock events) and include the RAPL event in the list of events to record,
not sure if that will accomplish what you're trying to do.
Vince
This looks promising, although I couldn't find any useful documentation
on this. Do you know if the perf userland tool allows for this kind of
slave-sampling or if I have to build my own tool around the perf_event API ?
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