linux-kernel - Re: [PATCH v2 4/4] perf config: Automatically create config file if not exists when setting config

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Message-ID: <20170508164126.GK7891@kernel.org>
Date:   Mon, 8 May 2017 13:41:26 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Taeung Song <treeze.taeung@...il.com>
Cc:     linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH v2 4/4] perf config: Automatically create config file if
 not exists when setting config

Em Mon, May 08, 2017 at 08:07:49PM +0900, Taeung Song escreveu:
> When setting config key-value pairs,
> if user or system config files are nonexistent,
> currently perf-config's setting didn't work right.

"currently doesn't work right" is too vague? In what way it doesn't
work? What happens? Can you rephrase this to describe what is going
wrong and how it should behave instead?

> So automatically create a config file on the situation.
> 
> Before:
> 
>   $ rm -f ~/.perfconfig && perf config --user report.children=false
> 
>   $ cat ~/.perfconfig
>   cat: /root/.perfconfig: No such file or directory
> 
> After:
> 
>   $ rm -f ~/.perfconfig && perf config --user report.children=false
> 
>   $ cat ~/.perfconfig
>   # this file is auto-generated.
>   [report]
>       children = false
> 
> NOTE:
> Even if not free config_set after perf_config_set__init() failed,
> it'll be freed at the tail end (i.e. by perf_config_set__delete()
> at the end of cmd_config()).
> 
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Signed-off-by: Taeung Song <treeze.taeung@...il.com>
> ---
>  tools/perf/util/config.c | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/tools/perf/util/config.c b/tools/perf/util/config.c
> index 8d724f0..1cc5d80 100644
> --- a/tools/perf/util/config.c
> +++ b/tools/perf/util/config.c
> @@ -691,10 +691,7 @@ struct perf_config_set *perf_config_set__new(void)
>  
>  	if (set) {
>  		INIT_LIST_HEAD(&set->sections);
> -		if (perf_config_set__init(set) < 0) {
> -			perf_config_set__delete(set);
> -			set = NULL;
> -		}
> +		perf_config_set__init(set);
>  	}
>  
>  	return set;
> -- 
> 2.7.4