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

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Date:	Tue, 15 May 2012 00:22:26 -0300
From:	Lucas Meneghel Rodrigues <lmr@...hat.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	David Ahern <dsahern@...il.com>,
	Namhyung Kim <namhyung.kim@....com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf-record: Create events initially disabled -- again

On Mon, 2012-05-14 at 22:46 -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 :-)
> 
> 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

Right now we have perf as a profiler inside autotest, which means one
can run autotest tests and have perf to profile the system while the
test is being run, so thank you guys for it :)

That said, I'm happy to help developing a test module for perf, be it
just a wrapper to an existing testsuite, or starting a new test module
from scratch. Let us know what you have in mind.

> 
> * http://autotest.github.com/


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