From: Adrien BAK <adrien.bak@metascale.org>
To: Vince Weaver <vincent.weaver@maine.edu>
Cc: linux-perf-users@vger.kernel.org
Subject: Re: recording rapl/power events
Date: Tue, 22 Apr 2014 11:31:06 +0900 [thread overview]
Message-ID: <5355D46A.4090209@metascale.org> (raw)
In-Reply-To: <alpine.DEB.2.10.1404211004570.10033@vincent-weaver-1.um.maine.edu>
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 ?
next prev parent reply other threads:[~2014-04-22 3:48 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-21 8:01 recording rapl/power events Adrien BAK
2014-04-21 14:07 ` Vince Weaver
2014-04-22 2:31 ` Adrien BAK [this message]
2014-04-22 10:17 ` Andi Kleen
2014-04-25 8:29 ` Namhyung Kim
2014-04-30 2:08 ` Adrien BAK
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