linux-kernel - Re: [PATCH 11/18] perf stat: Add -a as default target

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Date:   Mon, 20 Feb 2017 20:15:59 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
        Jiri Olsa <jolsa@...hat.com>, Jiri Olsa <jolsa@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH 11/18] perf stat: Add -a as default target

On Mon, Feb 20, 2017 at 04:08:32PM -0300, Arnaldo Carvalho de Melo wrote:
> From: Jiri Olsa <jolsa@...hat.com>
> 
> 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.
> 
> Committer note:
> 
> Testing it:
> 
>   # perf stat
>   ^C
>    Performance counter stats for 'system wide':
> 
>          3571.559178      cpu-clock (msec)          #    4.000 CPUs utilized
>                3,346      context-switches          #    0.937 K/sec
>                  277      cpu-migrations            #    0.078 K/sec
>               57,271      page-faults               #    0.016 M/sec
>        4,535,633,835      cycles                    #    1.270 GHz
>        6,389,736,516      instructions              #    1.41  insn per cycle
>        1,541,293,875      branches                  #  431.547 M/sec
>           14,526,396      branch-misses             #    0.94% of all branches
> 
>          0.892950118 seconds time elapsed
> 
>   #
> 
> Requested-and-Acked-by: Borislav Petkov <bp@...en8.de>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> Cc: David Ahern <dsahern@...il.com>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Link: http://lkml.kernel.org/r/20170217170034.GB15389@krava
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> ---
>  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 ca27a8a705ac..9989b03c21f2 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");
> -- 

This one doesn't work, see https://lkml.kernel.org/r/20170218175225.5cylpqti7oluqehv@pd.tnic

I have a better diff there :-)

-- 
Regards/Gruss,
    Boris.

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