linux-kernel - Re: [PATCH] perf-record: Create events initially disabled -- again

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Message-ID: <87fwb21a5u.fsf@sejong.aot.lge.com>
Date:	Tue, 15 May 2012 10:54:21 +0900
From:	Namhyung Kim <namhyung.kim@....com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	David Ahern <dsahern@...il.com>, linux-kernel@...r.kernel.org,
	Lucas Meneghel Rodrigues <lmr@...hat.com>
Subject: Re: [PATCH] perf-record: Create events initially disabled -- again

Hi,

On Mon, 14 May 2012 22:46:33 -0300, Arnaldo Carvalho de Melo wrote:
> Em Mon, May 14, 2012 at 07:42:30PM -0600, David Ahern escreveu:
>> On 5/14/12 7:07 PM, Namhyung Kim wrote:
>> >>Something else is wrong then. I tested that command (saw your patch in
>> >>the history) and it worked for me. Also, this code path does not
>> >>affect perf-stat -- it touches perf-record and perf-test only.
>
>> >Ah, right. But still wouldn't it be better changing the conditional
>> >rather than disabling it unconditionally?
>
>> I think it would be best to disable all events initially and then
>> enable them when ready. It works for perf-record and perf-test just
>> fine and limits the samples to what you care about.
>
> And we need to have all this logic in a central place, the "open" method
> of perf_evlist :-)
>

Agreed. So we need to make it generic to suitable for perf-stat and
perf-top (and others?) also.


> The perf_target abstraction is the way to get there, but in the process
> I think we really need to have each new method with a 'perf test' entry
> and in addition to that an 'autotest'* entry to test the perf builtins.
>
> - Arnaldo
>
> * http://autotest.github.com/

I'll have a look at it.

Thanks,
Namhyung
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