Re: [PATCH v3 4/4] perf config: Initialize perf_config_set with all default configs

[Namhyung Kim]

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 <namhy...@kernel.org>
> Cc: Jiri Olsa <jo...@kernel.org>
> Signed-off-by: Taeung Song <treeze.tae...@gmail.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
>