linux-kernel - Re: pref record question

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Message-Id: <1256012810.17774.17.camel@laptop>
Date:	Tue, 20 Oct 2009 06:26:50 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Tim Blechmann <tim@...ngt.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu
Subject: Re: pref record question

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.

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