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SubjectRe: [PATCH v11 17/24] perf config: Collect configs to handle config variables
On Tue, Nov 17, 2015 at 10:53:37PM +0900, Taeung Song wrote:
> Collecting configs into list because of two reason.
>
> First of all, if there are same variables both user
> and system config file, they all will be printed
> when 'list' command work. But if config variables are
> duplicated, user config variables should only be printed
> because it has priority.
>
> Lastly, list into which configs is collected
> will be required to keep and handle config variables
> and values in the near furture. For example,
> getting or setting functionality.
>
> And change show_config() function.
> Old show_config() worked depending on perf_config().
> New show_config() work using collected configs list.
>
> Cc: Jiri Olsa <jolsa@redhat.com>
> Signed-off-by: Taeung Song <treeze.taeung@gmail.com>

Acked-by: Namhyung Kim <namhyung@kernel.org>

Thanks,
Namhyung


> ---
> tools/perf/builtin-config.c | 150 ++++++++++++++++++++++++++++++++++++++++++--
> tools/perf/util/cache.h | 13 ++++
> 2 files changed, 158 insertions(+), 5 deletions(-)
>
> diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
> index e0f8b41..185aa5e 100644
> --- a/tools/perf/builtin-config.c
> +++ b/tools/perf/builtin-config.c
> @@ -32,13 +32,148 @@ static struct option config_options[] = {
> OPT_END()
> };
>
> -static int show_config(const char *key, const char *value,
> - void *cb __maybe_unused)
> +static struct config_section *find_section(struct list_head *sections,
> + const char *section_name)
> {
> + struct config_section *section;
> +
> + list_for_each_entry(section, sections, list)
> + if (!strcmp(section->name, section_name))
> + return section;
> +
> + return NULL;
> +}
> +
> +static struct config_element *find_element(const char *name,
> + struct config_section *section)
> +{
> + struct config_element *element;
> +
> + list_for_each_entry(element, &section->element_head, list)
> + if (!strcmp(element->name, name))
> + return element;
> +
> + return NULL;
> +}
> +
> +static void find_config(struct list_head *sections,
> + struct config_section **section,
> + struct config_element **element,
> + const char *section_name, const char *name)
> +{
> + *section = find_section(sections, section_name);
> +
> + if (*section != NULL)
> + *element = find_element(name, *section);
> + else
> + *element = NULL;
> +}
> +
> +static struct config_section *init_section(const char *section_name)
> +{
> + struct config_section *section;
> +
> + section = zalloc(sizeof(*section));
> + if (!section)
> + return NULL;
> +
> + INIT_LIST_HEAD(&section->element_head);
> + section->name = strdup(section_name);
> + if (!section->name) {
> + pr_err("%s: strdup failed\n", __func__);
> + free(section);
> + return NULL;
> + }
> +
> + return section;
> +}
> +
> +static int add_element(struct list_head *head,
> + const char *name, const char *value)
> +{
> + struct config_element *element;
> +
> + element = zalloc(sizeof(*element));
> + if (!element)
> + return -1;
> +
> + element->name = strdup(name);
> + if (!element->name) {
> + pr_err("%s: strdup failed\n", __func__);
> + free(element);
> + return -1;
> + }
> if (value)
> - printf("%s=%s\n", key, value);
> + element->value = (char *)value;
> else
> - printf("%s\n", key);
> + element->value = NULL;
> +
> + list_add_tail(&element->list, head);
> + return 0;
> +}
> +
> +static int collect_current_config(const char *var, const char *value,
> + void *spec_sections)
> +{
> + int ret = -1;
> + char *ptr, *key;
> + char *section_name, *name;
> + struct config_section *section = NULL;
> + struct config_element *element = NULL;
> + struct list_head *sections = (struct list_head *)spec_sections;
> +
> + key = ptr = strdup(var);
> + if (!key) {
> + pr_err("%s: strdup failed\n", __func__);
> + return -1;
> + }
> +
> + section_name = strsep(&ptr, ".");
> + name = ptr;
> + if (name == NULL || value == NULL)
> + goto out_err;
> +
> + find_config(sections, &section, &element, section_name, name);
> +
> + if (!section) {
> + section = init_section(section_name);
> + if (!section)
> + goto out_err;
> + list_add_tail(&section->list, sections);
> + }
> +
> + value = strdup(value);
> + if (!value) {
> + pr_err("%s: strdup failed\n", __func__);
> + goto out_err;
> + }
> +
> + if (!element)
> + add_element(&section->element_head, name, value);
> + else {
> + free(element->value);
> + element->value = (char *)value;
> + }
> +
> + ret = 0;
> +out_err:
> + free(key);
> + return ret;
> +}
> +
> +static int show_config(struct list_head *sections)
> +{
> + struct config_section *section;
> + struct config_element *element;
> +
> + if (list_empty(sections))
> + return -1;
> + list_for_each_entry(section, sections, list) {
> + list_for_each_entry(element, &section->element_head, list) {
> + printf("%s.%s=%s\n", section->name,
> + element->name, element->value);
> + }
> + }
>
> return 0;
> }
> @@ -46,6 +181,7 @@ static int show_config(const char *key, const char *value,
> int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
> {
> int ret = 0;
> + struct list_head sections;
>
> argc = parse_options(argc, argv, config_options, config_usage,
> PARSE_OPT_STOP_AT_NON_OPTION);
> @@ -57,18 +193,22 @@ int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
> return -1;
> }
>
> + INIT_LIST_HEAD(&sections);
> +
> if (use_system_config)
> config_exclusive_filename = perf_etc_perfconfig();
> else if (use_user_config)
> config_exclusive_filename = mkpath("%s/.perfconfig", getenv("HOME"));
>
> + perf_config(collect_current_config, &sections);
> +
> switch (actions) {
> case ACTION_LIST:
> if (argc) {
> pr_err("Error: takes no arguments\n");
> parse_options_usage(config_usage, config_options, "l", 1);
> } else {
> - ret = perf_config(show_config, NULL);
> + ret = show_config(&sections);
> if (ret < 0)
> pr_err("Nothing configured, "
> "please check your ~/.perfconfig file\n");
> diff --git a/tools/perf/util/cache.h b/tools/perf/util/cache.h
> index d1eb75f..e503371 100644
> --- a/tools/perf/util/cache.h
> +++ b/tools/perf/util/cache.h
> @@ -1,6 +1,7 @@
> #ifndef __PERF_CACHE_H
> #define __PERF_CACHE_H
>
> +#include <linux/list.h>
> #include <stdbool.h>
> #include "util.h"
> #include "strbuf.h"
> @@ -19,6 +20,18 @@
> #define PERF_DEBUGFS_ENVIRONMENT "PERF_DEBUGFS_DIR"
> #define PERF_TRACEFS_ENVIRONMENT "PERF_TRACEFS_DIR"
>
> +struct config_element {
> + char *name;
> + char *value;
> + struct list_head list;
> +};
> +
> +struct config_section {
> + char *name;
> + struct list_head element_head;
> + struct list_head list;
> +};
> +
> extern const char *config_exclusive_filename;
>
> typedef int (*config_fn_t)(const char *, const char *, void *);
> --
> 1.9.1
>


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