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Date: Fri, 17 Feb 2017 11:41:28 -0300 From: Arnaldo Carvalho de Melo <acme@...nel.org> To: Jiri Olsa <jolsa@...hat.com> 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 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
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