linux-kernel - Re: [PATCH v5 3/3] perf config: Allow creating empty config set for config file autogeneration

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Date:   Fri, 8 Sep 2017 11:36:28 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Taeung Song <treeze.taeung@...il.com>
Cc:     linux-kernel@...r.kernel.org, taeung@...slab.kr,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH v5 3/3] perf config: Allow creating empty config set for
 config file autogeneration

Em Thu, Sep 07, 2017 at 12:18:56PM +0900, Taeung Song escreveu:
> When there isn't a config file (e.g. ~/.perfconfig)
> or it has nothing, the config set wasn't created.
> If the config set not exists, a config file can't be autogenerated.
> 
> So allow creating a empty config set in the above case,
> then we can support the config file autogeneration.

Applied, and rephased a bit the cset log message.

- Arnaldo
 
> Before:
> 
>   $ rm -f ~/.perfconfig
>   $ perf config --user report.children=false
> 
>   $ cat ~/.perfconfig
>   cat: /root/.perfconfig: No such file or directory
> 
> But I think it should work even if there isn't a config file.
> 
> After:
> 
>   $ rm -f ~/.perfconfig
>   $ perf config --user report.children=false
> 
>   $ cat ~/.perfconfig
>   # this file is auto-generated.
>   [report]
>       children = false
> 
> NOTE:
> As a result, if perf_config_set__init() is failed,
> it seems that the config set isn't freed. But it isn't a problem.
> Because the config set  will be freed 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 bc75596..d2b6983 100644
> --- a/tools/perf/util/config.c
> +++ b/tools/perf/util/config.c
> @@ -700,10 +700,7 @@ 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