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

From: Arnaldo Carvalho de Melo
Date: Mon May 14 2012 - 21:46:34 EST

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 :-)

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

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