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

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Message-ID: <4F4B963F.4060705@gmail.com>
Date:	Mon, 27 Feb 2012 07:42:07 -0700
From:	David Ahern <dsahern@...il.com>
To:	Yuanfang Chen <cyfmxc@...il.com>
CC:	linux-kernel@...r.kernel.org, Namhyung Kim <namhyung@...il.com>
Subject: Re: perf record: can I specify multiple events and use different
 sample-after value

On 2/27/12 6:58 AM, Yuanfang Chen wrote:
> On Mon, Feb 27, 2012 at 8:56 AM, Yuanfang Chen<cyfmxc@...il.com>  wrote:
>>
>> On Feb 26, 2012 10:23 PM, "David Ahern"<dsahern@...il.com>  wrote:
>>>
>>> On 2/24/12 3:41 PM, Yuanfang Chen wrote:
>>>>
>>>> I think I'll settle with perf record for now. Still, unlike trace
>>>> event, sample count is not meaningful for PMU event. Output of "perf
>>>> script" does not include period value. One line of code will do the
>>>> work.
>>>>
>>>> lude 17342 750118.202915: raw 0x3c: 86754      ffffffff8115f6b9
>>>> __mem_cgroup_commit_char
>>>> lude 17342 750118.203025: raw 0x3c: 1027634   ffffffff811344b9
>>>> __mem_cgroup_commit_char
>>>>
>>>> 86754, 1027634 is the period value. But I'm not sure which is the PMU
>>>> value, is it just period value, or period x sample after. If so, what
>>>> is the sample after value?
>>>
>>>
>>> You lost me. You modified perf-script to print the period?
>>>
>>> Are you asking for the PMU counter value for 0x3c?
>
>       yes

perf-record does not get counter values when samples are genereated.

>
>>>
>>> What perf commands are you running?
>
>      perf script
>      (with no options)

record command?

I don't see what the 86754 and 1902764 values are in your example output 
above.


David
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