linux-kernel - Re: perf record: can I specify multiple events and use different sample-after value

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Date:	Thu, 23 Feb 2012 16:24:53 +0900
From:	Namhyung Kim <namhyung.kim@....com>
To:	linux-kernel@...r.kernel.org
Cc:	Namhyung Kim <namhyung@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: perf record: can I specify multiple events and use different
 sample-after value

2012-02-23 4:03 AM, Yuanfang Chen wrote:
> On Wed, Feb 22, 2012 at 6:40 AM, Namhyung Kim <namhyung@...il.com> wrote:
>> Namhyung Kim <namhyung.kim@....com> wrote:
>>> 2012-02-22 10:59 AM, Yuanfang Chen wrote:
>>>> I'm trying use perf tool from the linux kernel package to measure
>>>> several raw PMU events. In the manpage of perf-record there is an "-l"
>>>> option (Scale counter values), which is useful for my case because I
>>>> want to know the total counter value, not just sample count. However
>>>> it seems the -l is not recognized, is this expected? How can I get a
>>>> total count?
>>>
>>> "perf report --show-total-period" will be your friend.
>>
>> Or else, why not simply run "perf stat"?
>
> My purpose is to get some PMU counter value during each time interval,
> only perf record can do this. When using perf record -F, I have to add
> up all period value for some event in a some interval to get that
> value. When perf record -c, things get a easier, just (sample count x
> sample after value) will do, only hassle is to get sample count in
> some time interval. However, perf record don't have an option to do
> this.
>

I still don't get it. Why "perf stat -e <events> -p <pid> -- sleep <interval>"
doesn't work for you? It will show you the value, won't it?

Thanks,
Namhyung

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