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

From: Jiri Olsa
Date: Fri Feb 17 2017 - 09:33:35 EST

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