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 13:57:10 -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 2:40 AM, Namhyung Kim <namhyung.kim@....com> wrote:
> 2012-02-23 3:57 AM, Yuanfang Chen wrote:
>>
>> On Wed, Feb 22, 2012 at 1:01 AM, Namhyung Kim <namhyung.kim@....com>
>> wrote:
>>>
>>> 2012-02-22 10:59 AM, Yuanfang Chen wrote:
>>> The "-l" option was meaningful only if you specified events more than the
>>> actual number of counters in the PMU.
>>
>>
>> So -l is for multiplexing?
>>
>
> The "-l" option is no longer supported in perf record/report and
> multiplexing is always enabled by default, if needed. That would be the same
> even for old versions AFAIK, and "-l" option just controlled whether it'd
> scale or not the counter value which is taken from already multiplexed
> events.
>

My question may sounds silly, but why to scale the counter value? Why
it is deprecated now?

Thank you,
yuanfang

>
> Thanks,
> Namhyung
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