linux-kernel - Re: [PATCH v4 4/5] perf config: Add a option 'list-all' to perf-config

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Date:	Mon, 27 Jul 2015 17:48:47 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Taeung Song <treeze.taeung@...il.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	linux-kernel@...r.kernel.org, jolsa@...hat.com,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH v4 4/5] perf config: Add a option 'list-all' to
 perf-config

On Mon, Jul 27, 2015 at 12:58:30AM +0900, Taeung Song wrote:
> A option 'list-all' is to display both current config variables and
> all possible config variables with default values.
> The syntax examples are like below
> 
>     perf config [options]
> 
>     display all perf config with default values.
>     # perf config -a | --list-all
> 
> Signed-off-by: Taeung Song <treeze.taeung@...il.com>
> ---
>  tools/perf/Documentation/perf-config.txt |  6 ++++
>  tools/perf/builtin-config.c              | 48 ++++++++++++++++++++++++++++++++
>  2 files changed, 54 insertions(+)
> 
> diff --git a/tools/perf/Documentation/perf-config.txt b/tools/perf/Documentation/perf-config.txt
> index cd4b1a6..d8b3acc 100644
> --- a/tools/perf/Documentation/perf-config.txt
> +++ b/tools/perf/Documentation/perf-config.txt
> @@ -11,6 +11,8 @@ SYNOPSIS
>  'perf config' [<file-option>] [section.name[=value] ...]
>  or
>  'perf config' [<file-option>] -l | --list
> +or
> +'perf config' [<file-option>] -a | --list-all
>  
>  DESCRIPTION
>  -----------
> @@ -31,6 +33,10 @@ OPTIONS
>  	For writing and reading options: write to system-wide
>  	'$(sysconfdir)/perfconfig' or read it.
>  
> +-a::
> +--list-all::
> +	Show current and all possible config variables with default values.
> +
>  CONFIGURATION FILE
>  ------------------
>  
> diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
> index 6d9f28c..f4a1569 100644
> --- a/tools/perf/builtin-config.c
> +++ b/tools/perf/builtin-config.c
> @@ -23,6 +23,7 @@ static const char * const config_usage[] = {
>  };
>  
>  #define ACTION_LIST (1<<0)
> +#define ACTION_LIST_ALL (1<<1)
>  
>  static const struct option config_options[] = {
>  	OPT_GROUP("Config file location"),
> @@ -31,6 +32,8 @@ static const struct option config_options[] = {
>  	OPT_GROUP("Action"),
>  	OPT_BIT('l', "list", &actions,
>  		"show current config variables", ACTION_LIST),
> +	OPT_BIT('a', "list-all", &actions,
> +		"show current and all possible config variables with default values", ACTION_LIST_ALL),

Why did you use OPT_BIT?  Do you want to support multiple 'actions' at
the same time?  I'd rather support just one action, but I won't insist
it strongly..  Anyway, setting bits will confuse the switch statement
in the cmd_config().

Thanks,
Namhyung


>  	OPT_END()
>  };
>  
> @@ -539,6 +542,45 @@ static int collect_current_config(const char *var, const char *value,
>  			   normalize_value(section_name, name, value));
>  }
>  
> +static int show_all_config(void)
> +{
> +	int i;
> +	bool has_config;
> +	struct config_section *section_node;
> +	struct config_element *element_node;
> +
> +	for (i = 0; default_configsets[i].section_name != NULL; i++) {
> +		find_config(&section_node, &element_node,
> +			    default_configsets[i].section_name, default_configsets[i].name);
> +
> +		if (!element_node)
> +			printf("%s.%s=%s\n", default_configsets[i].section_name,
> +			       default_configsets[i].name, default_configsets[i].value);
> +		else
> +			printf("%s.%s=%s\n", section_node->name,
> +			       element_node->name, element_node->value);
> +	}
> +
> +	/* Print config variables the default configsets haven't */
> +	list_for_each_entry(section_node, &sections, list) {
> +		list_for_each_entry(element_node, &section_node->element_head, list) {
> +			has_config = false;
> +			for (i = 0; default_configsets[i].section_name != NULL; i++) {
> +				if (!strcmp(default_configsets[i].section_name, section_node->name)
> +				    && !strcmp(default_configsets[i].name, element_node->name)) {
> +					has_config = true;
> +					break;
> +				}
> +			}
> +			if (!has_config)
> +				printf("%s.%s=%s\n", section_node->name,
> +				       element_node->name, element_node->value);
> +		}
> +	}
> +
> +	return 0;
> +}
> +
>  static int perf_configset_with_option(configset_fn_t fn, const char *var, char *value)
>  {
>  	char *section_name;
> @@ -617,6 +659,12 @@ int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
>  		else
>  			goto out_err;
>  		goto out;
> +	case ACTION_LIST_ALL:
> +		if (argc == 0)
> +			ret = show_all_config();
> +		else
> +			goto out_err;
> +		goto out;
>  	default:
>  		if ((!has_option || use_global_config || use_system_config)
>  		    && argc == 0) {
> -- 
> 1.9.1
> 
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