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

From: Namhyung Kim
Date: Mon May 14 2012 - 21:55:59 EST


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
> *

I'll have a look at it.

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