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Date: Fri, 4 Mar 2016 21:45:44 +0900
From: Taeung Song <treeze.taeung@...il.com>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>,
linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
Jiri Olsa <jolsa@...hat.com>,
perf group <linux-perf-users@...r.kernel.org>,
Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v11 17/24] perf config: Collect configs to handle config
variables
Hi, Namhyung and all
(I'm modifying this patch to be tidy)
I have a mere question about name of a variable for
current config list that contains section list which has key-value
pairs from ~/.perfconfig or $(sysconfdir)/perfconfig config file.
(This variable is designed to be used by several functions
that handle config information(key-value pairs).)
I used 'sections' for this variable (type is 'struct list_head'),
but IMHO, I think that renaming it is better e.g.
1) 'cfglist'
2) 'configlist'
3) 'config_list'
4) 'cfgset'
5) 'configset'
6) 'config_set'
... :-\
It is trivial question,
but I wanna know a opinion of other people. :-)
Thanks,
Taeung
On 11/18/2015 02:15 PM, Namhyung Kim wrote:
> 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@...hat.com>
>> Signed-off-by: Taeung Song <treeze.taeung@...il.com>
>
> Acked-by: Namhyung Kim <namhyung@...nel.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, §ion->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(§ion->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, §ion, &element, section_name, name);
>> +
>> + if (!section) {
>> + section = init_section(section_name);
>> + if (!section)
>> + goto out_err;
>> + list_add_tail(§ion->list, sections);
>> + }
>> +
>> + value = strdup(value);
>> + if (!value) {
>> + pr_err("%s: strdup failed\n", __func__);
>> + goto out_err;
>> + }
>> +
>> + if (!element)
>> + add_element(§ion->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, §ion->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(§ions);
>> +
>> 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, §ions);
>> +
>> 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(§ions);
>> 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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