linux-kernel - Re: [PATCH 4/5] perf stat: Add -a as a default target

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Date:   Fri, 17 Feb 2017 15:33:27 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...nel.org>, David Ahern <dsahern@...il.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Borislav Petkov <bp@...en8.de>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH 4/5] perf stat: Add -a as a default target

On Fri, Feb 17, 2017 at 11:27:47AM -0300, Arnaldo Carvalho de Melo wrote:
> Em Fri, Feb 17, 2017 at 03:00:57PM +0100, Jiri Olsa escreveu:
> > Boris asked for default -a option in case we monitor
> > only uncore events. While implementing that I thought
> > it might be actually useful to make it overall default.
> > 
> >   # perf stat
> >   Warning: No target specified, setting system-wide collection (-a).
> 
> Humm, would be interesting to disable this after a few warnings? Just
> one?

not sure it's good idea to keep the count of that somewhere..
how about i make the warning smaller ;-)

  # perf stat
  Forced system wide target.
  ...

> 
> BTW, this is how 'perf trace' works since day one, i.e. no target means
> system wide syscall tracing.

or we could omit the warning completely as probably perf trace does

thanks,
jirka