linux-kernel - Re: [PATCH v3 4/4] perf config: Initialize perf_config

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Date:	Thu, 24 Mar 2016 15:13:17 +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, Jiri Olsa <jolsa@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v3 4/4] perf config: Initialize perf_config_set with all
 default configs

On Thu, Mar 24, 2016 at 05:16:33AM +0900, Taeung Song wrote:
> To avoid duplicated config variables and
> use perf_config_set classifying between standard
> perf config variables and unknown or new config
> variables other than them, initialize perf_config_set
> with all default configs.
> 
> And this will be needed when showing all configs with
> default value or checking correct type of a config
> variable in the near future.
> 
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Signed-off-by: Taeung Song <treeze.taeung@...il.com>
> ---
>  tools/perf/builtin-config.c | 11 +++++++----
>  tools/perf/util/config.c    | 35 +++++++++++++++++++++++++++++------
>  tools/perf/util/config.h    |  6 ++++++
>  3 files changed, 42 insertions(+), 10 deletions(-)
> 
> diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
> index c7cf34f..9e2adad 100644
> --- a/tools/perf/builtin-config.c
> +++ b/tools/perf/builtin-config.c
> @@ -35,23 +35,26 @@ static struct option config_options[] = {
>  
>  static int show_config(struct perf_config_set *perf_configs)
>  {
> +	bool has_value = false;
>  	struct perf_config_section *section;
>  	struct perf_config_item *config_item;
>  	struct list_head *sections = &perf_configs->sections;
>  
> -	if (list_empty(sections))
> -		return -1;
> -
>  	list_for_each_entry(section, sections, list) {
>  		list_for_each_entry(config_item, &section->config_items, list) {
>  			char *value = config_item->value;
>  
> -			if (value)
> +			if (value) {
>  				printf("%s.%s=%s\n", section->name,
>  				       config_item->name, value);
> +				has_value = true;
> +			}
>  		}
>  	}
>  
> +	if (!has_value)
> +		return -1;
> +
>  	return 0;
>  }
>  
> diff --git a/tools/perf/util/config.c b/tools/perf/util/config.c
> index e3e6ef4..725015f 100644
> --- a/tools/perf/util/config.c
> +++ b/tools/perf/util/config.c
> @@ -746,6 +746,29 @@ out_free:
>  	return ret;
>  }
>  
> +static struct perf_config_set *perf_config_set__init(struct perf_config_set *perf_configs)
> +{
> +	int i, j;
> +	struct perf_config_section *section;
> +	struct perf_config_item *config_items;
> +	struct list_head *sections = &perf_configs->sections;
> +
> +	INIT_LIST_HEAD(&perf_configs->sections);
> +
> +	for (i = 0; i != CONFIG_END; i++) {
> +		section = &default_sections[i];
> +		INIT_LIST_HEAD(&section->config_items);
> +
> +		config_items = default_config_items[i];
> +		for (j = 0; config_items[j].name != NULL; j++)
> +			list_add_tail(&config_items[j].list, &section->config_items);
> +
> +		list_add_tail(&section->list, sections);
> +	}
> +
> +	return perf_configs;
> +}
> +
>  struct perf_config_set *perf_config_set__new(void)
>  {
>  	struct perf_config_set *perf_configs = zalloc(sizeof(*perf_configs));
> @@ -753,7 +776,7 @@ struct perf_config_set *perf_config_set__new(void)
>  	if (!perf_configs)
>  		return NULL;
>  
> -	INIT_LIST_HEAD(&perf_configs->sections);
> +	perf_config_set__init(perf_configs);
>  	perf_config(collect_config, &perf_configs->sections);
>  
>  	return perf_configs;
> @@ -769,13 +792,13 @@ void perf_config_set__delete(struct perf_config_set *perf_configs)
>  		list_for_each_entry_safe(config_item, item_tmp,
>  					 &section->config_items, list) {
>  			list_del(&config_item->list);
> -			free((char *)config_item->name);
> -			free(config_item->value);
> -			free(config_item);
> +			if (config_item->is_custom) {

Where did you set the ->is_custom?


> +				free((char *)config_item->name);
> +				free(config_item->value);
> +				free(config_item);
> +			}
>  		}
>  		list_del(&section->list);
> -		free((char *)section->name);
> -		free(section);

Hmm.. I think the section also has to have something like is_custom
flag since the config file may have some sections/items currently
don't aware of.  That would be needed for forward-compatibility IMHO.

Thanks,
Namhyung


>  	}
>  
>  	free(perf_configs);
> diff --git a/tools/perf/util/config.h b/tools/perf/util/config.h
> index aa4a5a2..33cf9db 100644
> --- a/tools/perf/util/config.h
> +++ b/tools/perf/util/config.h
> @@ -14,6 +14,11 @@ enum perf_config_type {
>  	CONFIG_TYPE_STRING
>  };
>  
> +/**
> + * struct perf_config_item - element of perf's configs
> + *
> + * @is_custom: unknown or new config other than default config
> + */
>  struct perf_config_item {
>  	const char *name;
>  	char *value;
> @@ -27,6 +32,7 @@ struct perf_config_item {
>  		const char *s;
>  	} default_value;
>  	enum perf_config_type type;
> +	bool is_custom;
>  	struct list_head list;
>  };
>  
> -- 
> 2.5.0
>