linux-kernel - Re: pref record question

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Message-ID: <20091020060043.GB8550@elte.hu>
Date:	Tue, 20 Oct 2009 08:00:43 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Mike Galbraith <efault@....de>,
	Frédéric Weisbecker <fweisbec@...il.com>
Cc:	Tim Blechmann <tim@...ngt.org>, linux-kernel@...r.kernel.org
Subject: Re: pref record question


* Peter Zijlstra <peterz@...radead.org> wrote:

> On Mon, 2009-10-19 at 19:04 +0200, Tim Blechmann wrote:
>
> > i am trying to do some profiling with perf (2.6.31.4). while 
> > thread-level profiling works fine, i haven't been able to record 
> > profiling data of a whole process (i.e. main thread + child 
> > threads). from my understanding, this should be enabled by running 
> > 'perf record -i' on the main thread. this does only collect the data 
> > from the main thread, though.
> > 
> > is this an issue with perf or with my understanding of perf?
> 
> -i will only inherit the counters on new fork()/clone() calls, so an 
> existing process/task tree will not automagically get the counters.

Looks like something very much worth fixing.

	Ingo
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