Em Fri, Feb 17, 2017 at 03:33:27PM +0100, Jiri Olsa escreveu: > 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 I think that we should have some note on the Documentation (have you added it?) and be done with it. Another thing possiblity my mind, print that at the end? like: perf record ^C[ perf record: Woken up 1 times to write data - system wide samples ] [ perf record: Captured and wrote 1.738 MB perf.data (7565 samples) ] ---------- Then people will thing, hey, so now it does systemwide samples when I pass no target, I don't have anymore to type _three_ keys! cool! :-) - Arnaldo
