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Date: Wed, 21 Oct 2015 19:32:35 +0900
From: TaeWoong Song <treeze.taeung@...il.com>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
jolsa@...hat.com, Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH v7 2/7] perf config: Add '--system' and '--user' options to select which config file is used
Hi, Namhyung
Thanks for your review.
> On Oct 21, 2015, at 1:20 PM, Namhyung Kim <namhyung@...nel.org> wrote:
>
> On Sun, Oct 04, 2015 at 04:35:05PM +0900, Taeung Song wrote:
>> Which config file is used is decided in only perf_config().
>> And a perf-config command depend on perf_config() to list
>> config variables with values. So add '--system' and '--user'
>> options to select which config file to be used without perf_config().
>>
>> The file-options '--system' means $(sysconfdir)/perfconfig and
>> '--user' means $HOME/.perfconfig. If file-option isn't used,
>> both system and user config file is read
>> but user config have priority. The syntax examples are like below
>>
>> perf config [<file-option>] [options]
>>
>> a specific config file.
>> # perf config --user | --system
>> or
>> both user and system config file.
>> # perf config
>>
>> In addition, use List data structure which has config info.
>> Because perf_config() isn't used any more and directly collect
>> config info by perf_config_from_file() with a specific config
>> file path. Whichever config file or both are used, list is required
>> to keep and handle config variables and values.
>>
>> Signed-off-by: Taeung Song <treeze.taeung@...il.com>
>> ---
>
> Hmm.. Isn't it just a matter of setting of config_exclusive_filename
> variable? And then we can still use perf_config() no?
>
Yes, you are right.
I thought in a box.
If using config_exclusive_filename variable, source code will be simplified.
> I think it'd be better to split the collecting configs part into a
> separate patch.
The collecting config info is needed since a ‘list-all’ option.
So I’ll add it after the patch for specific config path (system or user)
But a patch collecting config info is useless in itself.
Starting a patch ‘list-all’, it has meaning.
Thanks,
Taeung
>
> Thanks,
> Namhyung
>
>
>> tools/perf/Documentation/perf-config.txt | 14 ++-
>> tools/perf/builtin-config.c | 163 +++++++++++++++++++++++++++++--
>> tools/perf/util/cache.h | 15 +++
>> tools/perf/util/config.c | 4 +-
>> 4 files changed, 187 insertions(+), 9 deletions(-)
>>
>> diff --git a/tools/perf/Documentation/perf-config.txt b/tools/perf/Documentation/perf-config.txt
>> index e8013b3..a42d409 100644
>> --- a/tools/perf/Documentation/perf-config.txt
>> +++ b/tools/perf/Documentation/perf-config.txt
>> @@ -8,7 +8,7 @@ perf-config - Get and set variables in a configuration file.
>> SYNOPSIS
>> --------
>> [verse]
>> -'perf config' -l | --list
>> +'perf config' [<file-option>] -l | --list
>>
>> DESCRIPTION
>> -----------
>> @@ -21,6 +21,14 @@ OPTIONS
>> --list::
>> Show current config variables, name and value, for all sections.
>>
>> +--user::
>> + For writing and reading options: write to user
>> + '$HOME/.perfconfig' file or read it.
>> +
>> +--system::
>> + For writing and reading options: write to system-wide
>> + '$(sysconfdir)/perfconfig' or read it.
>> +
>> CONFIGURATION FILE
>> ------------------
>>
>> @@ -33,6 +41,10 @@ store a system-wide default configuration.
>> The variables are divided into sections. In each section, the variables
>> that are composed of a name and value.
>>
>> +When reading or writing, the values are read from the system and user
>> +configuration files by default, and options '--system' and '--user'
>> +can be used to tell the command to read from or write to only that location.
>> +
>> Syntax
>> ~~~~~~
>>
>> diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
>> index 30b1500..92be3eb 100644
>> --- a/tools/perf/builtin-config.c
>> +++ b/tools/perf/builtin-config.c
>> @@ -13,8 +13,10 @@
>> #include "util/util.h"
>> #include "util/debug.h"
>>
>> +static bool use_system_config, use_user_config;
>> +
>> static const char * const config_usage[] = {
>> - "perf config [options]",
>> + "perf config [<file-option>] [options]",
>> NULL
>> };
>>
>> @@ -23,19 +25,150 @@ enum actions {
>> } actions;
>>
>> static struct option config_options[] = {
>> + OPT_GROUP("Config file location"),
>> + OPT_BOOLEAN(0, "system", &use_system_config, "use system config file"),
>> + OPT_BOOLEAN(0, "user", &use_user_config, "use user config file"),
>> OPT_GROUP("Action"),
>> OPT_SET_UINT('l', "list", &actions,
>> "show current config variables", ACTION_LIST),
>> OPT_END()
>> };
>> +static int show_config(struct list_head *sections)
>> +{
>> + struct config_section *section;
>> + struct config_element *element;
>> +
>> + 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;
>> +}
>>
>> -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 __maybe_unused)
>> +{
>> + struct config_section *section = NULL;
>> + struct config_element *element = NULL;
>> + struct list_head *sections = (struct list_head *)spec_sections;
>> + char *key = strdup(var);
>> + char *section_name, *name;
>> +
>> + if (!key) {
>> + pr_err("%s: strdup failed\n", __func__);
>> + return -1;
>> + }
>> +
>> + section_name = strsep(&key, ".");
>> + name = strsep(&key, ".");
>> + free(key);
>> + if (name == NULL)
>> + return -1;
>> +
>> + find_config(sections, §ion, &element, section_name, name);
>> +
>> + if (!section) {
>> + section = init_section(section_name);
>> + if (!section)
>> + return -1;
>> + list_add_tail(§ion->list, sections);
>> + }
>> +
>> + value = strdup(value);
>> + if (!value) {
>> + pr_err("%s: strdup failed\n", __func__);
>> + return -1;
>> + }
>> +
>> + if (!element)
>> + return add_element(§ion->element_head, name, value);
>> + else {
>> + free(element->value);
>> + element->value = (char *)value;
>> + }
>>
>> return 0;
>> }
>> @@ -43,10 +176,28 @@ 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;
>> + const char *system_config = perf_etc_perfconfig();
>> + char *user_config = mkpath("%s/.perfconfig", getenv("HOME"));
>>
>> argc = parse_options(argc, argv, config_options, config_usage,
>> PARSE_OPT_STOP_AT_NON_OPTION);
>>
>> + if (use_system_config && use_user_config) {
>> + pr_err("Error: only one config file at a time\n");
>> + parse_options_usage(config_usage, config_options, "user", 0);
>> + parse_options_usage(NULL, config_options, "system", 0);
>> + return -1;
>> + }
>> +
>> + INIT_LIST_HEAD(§ions);
>> +
>> + if (use_system_config || (!use_system_config && !use_user_config))
>> + perf_config_from_file(collect_current_config, system_config, §ions);
>> +
>> + if (use_user_config || (!use_system_config && !use_user_config))
>> + perf_config_from_file(collect_current_config, user_config, §ions);
>> +
>> switch (actions) {
>> case ACTION_LIST:
>> default:
>> @@ -55,7 +206,7 @@ int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
>> parse_options_usage(config_usage, config_options, "l", 1);
>> return -1;
>> } else
>> - ret = perf_config(show_config, NULL);
>> + ret = show_config(§ions);
>> }
>>
>> return ret;
>> diff --git a/tools/perf/util/cache.h b/tools/perf/util/cache.h
>> index c861373..712e82b 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"
>> @@ -19,14 +20,28 @@
>> #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;
>> +};
>> +
>> typedef int (*config_fn_t)(const char *, const char *, void *);
>> extern int perf_default_config(const char *, const char *, void *);
>> extern int perf_config(config_fn_t fn, void *);
>> +extern int perf_config_from_file(config_fn_t fn, const char *filename, void *data);
>> extern int perf_config_int(const char *, const char *);
>> extern u64 perf_config_u64(const char *, const char *);
>> extern int perf_config_bool(const char *, const char *);
>> extern int config_error_nonbool(const char *);
>> extern const char *perf_config_dirname(const char *, const char *);
>> +extern const char *perf_etc_perfconfig(void);
>>
>> /* pager.c */
>> extern void setup_pager(void);
>> diff --git a/tools/perf/util/config.c b/tools/perf/util/config.c
>> index 2e452ac..23fa8c5 100644
>> --- a/tools/perf/util/config.c
>> +++ b/tools/perf/util/config.c
>> @@ -416,7 +416,7 @@ int perf_default_config(const char *var, const char *value,
>> return 0;
>> }
>>
>> -static int perf_config_from_file(config_fn_t fn, const char *filename, void *data)
>> +int perf_config_from_file(config_fn_t fn, const char *filename, void *data)
>> {
>> int ret;
>> FILE *f = fopen(filename, "r");
>> @@ -434,7 +434,7 @@ static int perf_config_from_file(config_fn_t fn, const char *filename, void *dat
>> return ret;
>> }
>>
>> -static const char *perf_etc_perfconfig(void)
>> +const char *perf_etc_perfconfig(void)
>> {
>> static const char *system_wide;
>> if (!system_wide)
>> --
>> 1.9.1
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