Subject: Re: [PATCH 1/1 v2] perf record: We should fork only if a program
 was specified to run
From: Peter Zijlstra <peterz@infradead.org>
To: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: Ingo Molnar <mingo@elte.hu>, linux-kernel@vger.kernel.org,
       =?ISO-8859-1?Q?Fr=E9d=E9ric?= Weisbecker <fweisbec@gmail.com>,
       Mike Galbraith <efault@gmx.de>, Paul Mackerras <paulus@samba.org>
In-Reply-To: <20091219215834.GE19708@ghostprotocols.net>
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	 <1261258741.4314.0.camel@laptop>
	 <20091219215834.GE19708@ghostprotocols.net>
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Date: Sat, 19 Dec 2009 23:03:27 +0100
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On Sat, 2009-12-19 at 19:58 -0200, Arnaldo Carvalho de Melo wrote:
> Em Sat, Dec 19, 2009 at 10:39:01PM +0100, Peter Zijlstra escreveu:
> > On Sat, 2009-12-19 at 19:22 -0200, Arnaldo Carvalho de Melo wrote:
> > > @@ -550,7 +551,7 @@ static int __cmd_record(int argc __used, const char **argv)
> > >                         return err;
> > >         }
> > >  
> > > -       if (!system_wide)
> > > +       if (!system_wide && profile_cpu == -1)
> > >                 event__synthesize_thread(pid, process_synthesized_event,
> > >                                          session); 
> > 
> > Not actually sure about this bit though, since we now have
> > per-task-per-cpu things, the profile_cpu is also used to !system_wide.
> 
> this actually means: if it is not system wide and not for an specific
> cpu, it must be for an specific pid.

But it can be for a specific pid and specific cpu.

> Not clear, right, you may want to profile an specific pid but only when
> it is running on an specific CPU... But at least this patch allows for
> specifiying either an specific CPU or an specific pid or systemwide.

Ah, right, not enough state to tell what we meant, fair enough.

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