linux-kernel - Re: [PATCH v5 2/3] perf config: Once write a config file in the end, not a repeat

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Date:   Fri, 8 Sep 2017 11:33:56 -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 2/3] perf config: Once write a config file in the end,
 not a repeat

Em Thu, Sep 07, 2017 at 12:18:51PM +0900, Taeung Song escreveu:
> Currently set_config() can be repeatedly called for each
> input config on the below case:
> 
>   $ perf config kmem.default=slab report.children=false ...
> 
> But it's a waste, so only once write a config file
> gathering all given config key=value pairs

Thanks, applied.

- Arnaldo
 
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Signed-off-by: Taeung Song <treeze.taeung@...il.com>
> ---
>  tools/perf/builtin-config.c | 22 ++++++++++++++++------
>  1 file changed, 16 insertions(+), 6 deletions(-)
> 
> diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
> index a1d82e3..b89417d 100644
> --- a/tools/perf/builtin-config.c
> +++ b/tools/perf/builtin-config.c
> @@ -34,8 +34,7 @@ static struct option config_options[] = {
>  	OPT_END()
>  };
>  
> -static int set_config(struct perf_config_set *set, const char *file_name,
> -		      const char *var, const char *value)
> +static int set_config(struct perf_config_set *set, const char *file_name)
>  {
>  	struct perf_config_section *section = NULL;
>  	struct perf_config_item *item = NULL;
> @@ -49,7 +48,6 @@ static int set_config(struct perf_config_set *set, const char *file_name,
>  	if (!fp)
>  		return -1;
>  
> -	perf_config_set__collect(set, file_name, var, value);
>  	fprintf(fp, "%s\n", first_line);
>  
>  	/* overwrite configvariables */
> @@ -161,6 +159,7 @@ int cmd_config(int argc, const char **argv)
>  	struct perf_config_set *set;
>  	char *user_config = mkpath("%s/.perfconfig", getenv("HOME"));
>  	const char *config_filename;
> +	bool changed = false;
>  
>  	argc = parse_options(argc, argv, config_options, config_usage,
>  			     PARSE_OPT_STOP_AT_NON_OPTION);
> @@ -231,15 +230,26 @@ int cmd_config(int argc, const char **argv)
>  					goto out_err;
>  				}
>  			} else {
> -				if (set_config(set, config_filename, var, value) < 0) {
> -					pr_err("Failed to set '%s=%s' on %s\n",
> -					       var, value, config_filename);
> +				if (perf_config_set__collect(set, config_filename,
> +							     var, value) < 0) {
> +					pr_err("Failed to add '%s=%s'\n",
> +					       var, value);
>  					free(arg);
>  					goto out_err;
>  				}
> +				changed = true;
>  			}
>  			free(arg);
>  		}
> +
> +		if (!changed)
> +			break;
> +
> +		if (set_config(set, config_filename) < 0) {
> +			pr_err("Failed to set the configs on %s\n",
> +			       config_filename);
> +			goto out_err;
> +		}
>  	}
>  
>  	ret = 0;
> -- 
> 2.7.4