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

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Date:	Fri, 07 Aug 2015 10:12:02 +0900
From:	taeung <treeze.taeung@...il.com>
To:	Namhyung Kim <namhyung@...nel.org>
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

Hi, Namhyung

On 07/27/2015 05:48 PM, Namhyung Kim wrote:
> 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
>
I don't understand why setting bits will confuse the switch statement.
Is the reason about readability of source code ?

But I searched for other parse-option which can be replaced.
Is it better to use OPT_SET_INT instead of OPT_BIT ?

Thanks,
Taeung

>>   	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
>>

-- 
Thanks,
Taeung

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