hi Namhyung, yes it seems. However, when I run what you suggest, I get the following :
perf record -a -e '{cycles,power/energy-pkg/}:S' 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?Once again, I'm pretty sure my kernel is correctly configured, as I can get power measurement using perf stat. Is this a bug somewhere ? Can you confirm that this works for you and that I should investigate what can go wrong with my system ?
A. On 25/04/2014 17:29, Namhyung Kim wrote:
Hi Andi, On Tue, 22 Apr 2014 03:17:56 -0700, Andi Kleen wrote:Adrien BAK <adrien....@metascale.org> writes: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 ?perf record supports it (with :S), but none of the reporting tools unfortunately.It seems it's what --group option of perf report is for? $ perf record -e '{cycles,power/energy-pkg/}:S' -a sleep 1 $ perf report --group --stdio Thanks, NamhyungHowever keep in mind that very rapid sampling of RAPL is not likely to give useful results. The data only really makes sense over longer intervals. -Andi-- To unsubscribe from this list: send the line "unsubscribe linux-perf-users" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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