linux-kernel - Re: [PATCH 02/23] perf buildid-cache: Add -q/--quiet option

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Date:   Wed, 8 Mar 2017 01:07:59 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Jiri Olsa <jolsa@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>, kernel-team@....com
Subject: Re: [PATCH 02/23] perf buildid-cache: Add -q/--quiet option

Hi Arnaldo,

On Wed, Mar 8, 2017 at 12:28 AM, Arnaldo Carvalho de Melo
<acme@...nel.org> wrote:
> Em Wed, Mar 08, 2017 at 12:08:30AM +0900, Namhyung Kim escreveu:
>> The -q/--quiet option is to suppress any message.  Sometimes users just
>> want to run the command and it can be used for that case.
>
> <SNIP>
>
>> +++ b/tools/perf/builtin-buildid-cache.c
>> @@ -311,6 +311,7 @@ int cmd_buildid_cache(int argc, const char **argv,
>>       OPT_INCR('v', "verbose", &verbose, "be more verbose"),
>> +     OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
>>       OPT_END()
>>       };
>>       const char * const buildid_cache_usage[] = {
>> @@ -326,6 +327,9 @@ int cmd_buildid_cache(int argc, const char **argv,
>>
>> +     if (quiet)
>> +             perf_quiet_option();
>> +
>
> Hey, I see that this is done lots of times, can't we use that parent
> option stuff? Or some fallback we can have in perf's main() for thing
> like this?

I thought about it.  But perf main option handling is different from
command options.  Also it needs to be called after option parsing
is done to overwrite 'verbose' properly.

Thanks,
Namhyung