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Subject[PATCH v14 20/23] perf config: Add 'get' functionality
Date
This patch consists of functions
which can get specific config variables.
For the syntax examples,

perf config [<file-option>] [section.name ...]

display key-value pairs of specific config variables
# perf config report.queue-size report.children

In addition, the functionality can work with --verbose option
to show the config description, i.e.

# perf config -v report.queue-size

Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Taeung Song <treeze.taeung@gmail.com>
---
tools/perf/Documentation/perf-config.txt | 2 +
tools/perf/builtin-config.c | 83 ++++++++++++++++++++++++++++++--
tools/perf/util/cache.h | 1 +
3 files changed, 82 insertions(+), 4 deletions(-)

diff --git a/tools/perf/Documentation/perf-config.txt b/tools/perf/Documentation/perf-config.txt
index 3706ea2..14535fc 100644
--- a/tools/perf/Documentation/perf-config.txt
+++ b/tools/perf/Documentation/perf-config.txt
@@ -8,6 +8,8 @@ perf-config - Get and set variables in a configuration file.
SYNOPSIS
--------
[verse]
+'perf config' [<file-option>] [section.name ...]
+or
'perf config' [<file-option>] -l | --list
or
'perf config' [<file-option>] -a | --list-all
diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
index bf50426..a0a6078 100644
--- a/tools/perf/builtin-config.c
+++ b/tools/perf/builtin-config.c
@@ -16,7 +16,7 @@
static bool use_system_config, use_user_config;

static const char * const config_usage[] = {
- "perf config [<file-option>] [options]",
+ "perf config [<file-option>] [options] [section.name ...]",
NULL
};

@@ -396,6 +396,40 @@ static int show_all_config(struct list_head *sections)
return 0;
}

+static int show_spec_config(struct list_head *sections,
+ const char *section_name, const char *name)
+{
+ int i;
+ struct config_section *section = NULL;
+ struct config_element *element = NULL;
+
+ find_config(sections, &section, &element, section_name, name);
+
+ if (section && element) {
+ printf("%s.%s=%s\n", section->name,
+ element->name, element->value);
+ return 0;
+ }
+
+ for (i = 0; default_configs[i].type != CONFIG_END; i++) {
+ struct config_item *config = &default_configs[i];
+
+ if (!strcmp(config->section, section_name) &&
+ !strcmp(config->name, name)) {
+ char *value = get_value(config);
+
+ if (verbose)
+ printf("# %s\n", config->desc);
+ printf("%s.%s=%s (default)\n", config->section,
+ config->name, value);
+ free(value);
+ return 0;
+ }
+ }
+
+ return -1;
+}
+
static int collect_current_config(const char *var, const char *value,
void *spec_sections)
{
@@ -445,6 +479,43 @@ out_err:
return ret;
}

+static int perf_configset_with_option(configset_fn_t fn, struct list_head *sections,
+ const char *var)
+{
+ int ret = -1;
+ char *ptr, *key;
+ const char *last_dot;
+ char *section_name, *name;
+
+ key = ptr = strdup(var);
+ if (!key) {
+ pr_err("%s: strdup failed\n", __func__);
+ return -1;
+ }
+ last_dot = strchr(key, '.');
+ /*
+ * Since "key" actually contains the section name and the real
+ * key name separated by a dot, we have to know where the dot is.
+ */
+ if (last_dot == NULL || last_dot == key) {
+ pr_err("The config variable does not contain a section: %s\n", key);
+ goto out_err;
+ }
+ if (!last_dot[1]) {
+ pr_err("The config varible does not contain variable name: %s\n", key);
+ goto out_err;
+ }
+
+ section_name = strsep(&ptr, ".");
+ name = ptr;
+ fn(sections, section_name, name);
+ ret = 0;
+
+out_err:
+ free(key);
+ return ret;
+}
+
static int show_config(struct list_head *sections)
{
struct config_section *section;
@@ -464,7 +535,7 @@ static int show_config(struct list_head *sections)

int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
{
- int ret = 0;
+ int i, ret = 0;
struct list_head sections;
char *user_config = mkpath("%s/.perfconfig", getenv("HOME"));

@@ -502,7 +573,6 @@ int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
ret = show_all_config(&sections);
break;
}
- /* fall through */
case ACTION_LIST:
if (argc) {
pr_err("Error: takes no arguments\n");
@@ -522,7 +592,12 @@ int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
}
break;
default:
- usage_with_options(config_usage, config_options);
+ if (argc)
+ for (i = 0; argv[i]; i++)
+ ret = perf_configset_with_option(show_spec_config, &sections,
+ argv[i]);
+ else
+ usage_with_options(config_usage, config_options);
}

return ret;
diff --git a/tools/perf/util/cache.h b/tools/perf/util/cache.h
index 92cd739..d5dcc85 100644
--- a/tools/perf/util/cache.h
+++ b/tools/perf/util/cache.h
@@ -39,6 +39,7 @@ struct config_section {
extern const char *config_exclusive_filename;

typedef int (*config_fn_t)(const char *, const char *, void *);
+typedef int (*configset_fn_t)(struct list_head *, const char *, const char *);
extern int perf_default_config(const char *, const char *, void *);
extern int perf_config(config_fn_t fn, void *);
extern int perf_config_int(const char *, const char *);
--
2.5.0
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