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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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