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

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Message-ID: <CAJh9x3o4ELjmrmYhba_R-8G6TciuXY9M3PpjAeCtFNaPmvpKHA@mail.gmail.com>
Date:	Thu, 23 Feb 2012 13:52:09 -0500
From:	Yuanfang Chen <cyfmxc@...il.com>
To:	Namhyung Kim <namhyung.kim@....com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: perf record: can I specify multiple events and use different
 sample-after value

On Thu, Feb 23, 2012 at 1:51 PM, Yuanfang Chen <cyfmxc@...il.com> wrote:
> On Thu, Feb 23, 2012 at 2:24 AM, Namhyung Kim <namhyung.kim@....com> wrote:
>> 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?
>
> say my application(not an existing process, so -p <pid> does not
> work.) run for 10 seconds. I want the r03c, r2d4 value during each
> second.  So there will be two values for each event in one second.

oops, forgot to forward. :-)

>
>>
>> Thanks,
>> Namhyung
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