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[PATCHv2 4/5] perf stat: Add -a as a default target

From Jiri Olsa <jolsa@redhat.com>
Newsgroups linux.kernel
Subject [PATCHv2 4/5] perf stat: Add -a as a default target
Date 2017-02-17 18:10 +0100
Message-ID <tbUcF-76j-1@gated-at.bofh.it> (permalink)
References <tbRou-5iA-11@gated-at.bofh.it> <tbRov-5iA-31@gated-at.bofh.it> <tbRHR-5pX-39@gated-at.bofh.it> <tbRRw-5tj-15@gated-at.bofh.it> <tbS1b-5xl-17@gated-at.bofh.it>
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On Fri, Feb 17, 2017 at 11:41:28AM -0300, Arnaldo Carvalho de Melo wrote:
> 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! :-)

ok, posting the change with no warning

jirka

---
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.

Running 'perf stat' will now collect system wide data.

Requested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-tq11of2qlz8kxpxzva05d54l@git.kernel.org
---
 tools/perf/Documentation/perf-stat.txt | 2 +-
 tools/perf/builtin-stat.c              | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt
index d96ccd4844df..aecf2a87e7d6 100644
--- a/tools/perf/Documentation/perf-stat.txt
+++ b/tools/perf/Documentation/perf-stat.txt
@@ -63,7 +63,7 @@ report::
 
 -a::
 --all-cpus::
-        system-wide collection from all CPUs
+        system-wide collection from all CPUs (default if no target is specified)
 
 -c::
 --scale::
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index f28719178b51..70ed4f9d014e 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -2445,8 +2445,9 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
 	} else if (big_num_opt == 0) /* User passed --no-big-num */
 		big_num = false;
 
+	/* Make system wide (-a) the default target. */
 	if (!argc && target__none(&target))
-		usage_with_options(stat_usage, stat_options);
+		target.system_wide = true;
 
 	if (run_count < 0) {
 		pr_err("Run count must be a positive number\n");
-- 
2.7.4

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Thread

[PATCH 0/5] perf tools: Few fixes Jiri Olsa <jolsa@kernel.org> - 2017-02-17 15:10 +0100
  [PATCH 3/5] perf tools: Fail on using multiple bits long terms without value Jiri Olsa <jolsa@kernel.org> - 2017-02-17 15:10 +0100
    [tip:perf/urgent] perf tools: Fail on using multiple bits long  terms without value tip-bot for Jiri Olsa <tipbot@zytor.com> - 2017-02-21 09:20 +0100
  [PATCH 5/5] perf record: Add -a as a default target Jiri Olsa <jolsa@kernel.org> - 2017-02-17 15:10 +0100
    Re: [PATCH 5/5] perf record: Add -a as a default target Arnaldo Carvalho de Melo <acme@kernel.org> - 2017-02-17 15:30 +0100
      Re: [PATCH 5/5] perf record: Add -a as a default target Jiri Olsa <jolsa@redhat.com> - 2017-02-17 18:10 +0100
        [tip:perf/urgent] perf record: Add -a as default target tip-bot for Jiri Olsa <tipbot@zytor.com> - 2017-02-21 09:20 +0100
  [PATCH 4/5] perf stat: Add -a as a default target Jiri Olsa <jolsa@kernel.org> - 2017-02-17 15:10 +0100
    Re: [PATCH 4/5] perf stat: Add -a as a default target Arnaldo Carvalho de Melo <acme@kernel.org> - 2017-02-17 15:30 +0100
      Re: [PATCH 4/5] perf stat: Add -a as a default target Jiri Olsa <jolsa@redhat.com> - 2017-02-17 15:40 +0100
        Re: [PATCH 4/5] perf stat: Add -a as a default target Arnaldo Carvalho de Melo <acme@kernel.org> - 2017-02-17 15:50 +0100
          Re: [PATCH 4/5] perf stat: Add -a as a default target Jiri Olsa <jolsa@redhat.com> - 2017-02-17 15:50 +0100
          [PATCHv2 4/5] perf stat: Add -a as a default target Jiri Olsa <jolsa@redhat.com> - 2017-02-17 18:10 +0100
            Re: [PATCHv2 4/5] perf stat: Add -a as a default target Boris Petkov <bp@alien8.de> - 2017-02-17 19:20 +0100
              Re: [PATCHv2 4/5] perf stat: Add -a as a default target Borislav Petkov <bp@alien8.de> - 2017-02-18 19:00 +0100
                Re: [PATCHv2 4/5] perf stat: Add -a as a default target Jiri Olsa <jolsa@redhat.com> - 2017-02-20 08:20 +0100
                Re: [PATCHv2 4/5] perf stat: Add -a as a default target Borislav Petkov <bp@alien8.de> - 2017-02-20 21:40 +0100
                Re: [PATCHv2 4/5] perf stat: Add -a as a default target Arnaldo Carvalho de Melo <acme@kernel.org> - 2017-02-20 22:30 +0100
                Re: [PATCHv2 4/5] perf stat: Add -a as a default target Borislav Petkov <bp@alien8.de> - 2017-02-20 23:50 +0100
                Re: [PATCHv2 4/5] perf stat: Add -a as a default target Jiri Olsa <jolsa@redhat.com> - 2017-02-21 09:00 +0100
                Re: [PATCHv2 4/5] perf stat: Add -a as a default target Jiri Olsa <jolsa@redhat.com> - 2017-02-21 12:10 +0100
                Re: [PATCHv2 4/5] perf stat: Add -a as a default target Borislav Petkov <bp@alien8.de> - 2017-02-21 12:30 +0100
                Re: [PATCHv2 4/5] perf stat: Add -a as a default target Arnaldo Carvalho de Melo <acme@kernel.org> - 2017-02-21 14:40 +0100
                Re: [PATCHv2 4/5] perf stat: Add -a as a default target Borislav Petkov <bp@alien8.de> - 2017-02-21 15:10 +0100
                Re: [PATCHv2 4/5] perf stat: Add -a as a default target Arnaldo Carvalho de Melo <acme@kernel.org> - 2017-02-21 15:30 +0100
            [tip:perf/urgent] perf stat: Add -a as default target tip-bot for Jiri Olsa <tipbot@zytor.com> - 2017-02-21 09:20 +0100
  [PATCH 1/5] perf build: Add special fixdep cleaning rule Jiri Olsa <jolsa@kernel.org> - 2017-02-17 15:10 +0100
    [tip:perf/urgent] perf build: Add special fixdep cleaning rule tip-bot for Jiri Olsa <tipbot@zytor.com> - 2017-02-21 09:20 +0100

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