linux-kernel - Re: [PATCH 5/5] perf record: Add -a as a default target

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Date:   Fri, 17 Feb 2017 11:28:14 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     David Ahern <dsahern@...il.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH 5/5] perf record: Add -a as a default target

Em Fri, Feb 17, 2017 at 03:00:58PM +0100, Jiri Olsa escreveu:
> Adding system wide (-a) option as a default target
> if non is specified.
> 
>   # perf record
>   Warning: No target specified, setting system-wide collection (-a).

Ditto, this warning will get annoying after a while...

>   ...
> 
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> Cc: David Ahern <dsahern@...il.com>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Link: http://lkml.kernel.org/n/tip-tq11of2qlz8kxpxzva05d54l@git.kernel.org
> ---
>  tools/perf/Documentation/perf-record.txt | 2 +-
>  tools/perf/builtin-record.c              | 6 ++++--
>  2 files changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
> index 27256bc68eda..b16003ec14a7 100644
> --- a/tools/perf/Documentation/perf-record.txt
> +++ b/tools/perf/Documentation/perf-record.txt
> @@ -157,7 +157,7 @@ OPTIONS
>  
>  -a::
>  --all-cpus::
> -        System-wide collection from all CPUs.
> +        System-wide collection from all CPUs (default if no target is specified).
>  
>  -p::
>  --pid=::
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index 6cd6776052e7..dab23f6b10f3 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -1677,8 +1677,10 @@ int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)
>  
>  	argc = parse_options(argc, argv, record_options, record_usage,
>  			    PARSE_OPT_STOP_AT_NON_OPTION);
> -	if (!argc && target__none(&rec->opts.target))
> -		usage_with_options(record_usage, record_options);
> +	if (!argc && target__none(&rec->opts.target)) {
> +		pr_warning("Warning: No target specified, setting system-wide collection (-a).\n");
> +		rec->opts.target.system_wide = true;
> +	}
>  
>  	if (nr_cgroups && !rec->opts.target.system_wide) {
>  		usage_with_options_msg(record_usage, record_options,
> -- 
> 2.7.4