[PATCH v5 5/6] perf config: Add 'set' feature

From: Taeung Song
Date: Mon Aug 17 2015 - 13:29:30 EST

This patch consists of functions
which can set specific config variables.
For the syntax examples,

perf config [options] [section.name[=value] ...]

set specific config variables
# perf config report.queue-size=100M report.children=true

Signed-off-by: Taeung Song <treeze.taeung@xxxxxxxxx>
---
tools/perf/Documentation/perf-config.txt | 2 +-
tools/perf/builtin-config.c | 55 +++++++++++++++++++++++++++++---
tools/perf/util/cache.h | 3 +-
tools/perf/util/config.c | 27 ++++++++++++++++
4 files changed, 80 insertions(+), 7 deletions(-)

diff --git a/tools/perf/Documentation/perf-config.txt b/tools/perf/Documentation/perf-config.txt
index 691d52b..9c95af8 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' [<file-option>] [section.name ...]
+'perf config' [<file-option>] [section.name[=value] ...]
or
'perf config' [<file-option>] -l | --list
or
diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
index 0f2193a..d5cc3e8 100644
--- a/tools/perf/builtin-config.c
+++ b/tools/perf/builtin-config.c
@@ -17,7 +17,7 @@ static bool use_system_config, use_user_config;
static const char *config_file_name;

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

@@ -412,7 +412,8 @@ static void find_config(struct config_section **section_node,
*element_node = NULL;
}

-static int show_spec_config(const char *section_name, const char *name)
+static int show_spec_config(const char *section_name, const char *name,
+ char *value __maybe_unused)
{
int i;
struct config_section *section_node = NULL;
@@ -488,6 +489,34 @@ static char *normalize_value(const char *section_name, const char *name, const c
return normalized;
}

+static int set_config(const char *section_name, const char *name, char *value)
+{
+ struct config_section *section_node = NULL;
+ struct config_element *element_node = NULL;
+
+ find_config(&section_node, &element_node, section_name, name);
+ if (value != NULL) {
+ value = normalize_value(section_name, name, value);
+
+ /* if there isn't existent section, add a new section */
+ if (!section_node) {
+ section_node = init_section(section_name);
+ if (!section_node)
+ return -1;
+ list_add_tail(&section_node->list, &sections);
+ }
+ /* if nothing to replace, add a new element which contains key-value pair. */
+ if (!element_node) {
+ add_element(&section_node->element_head, name, value);
+ } else {
+ free(element_node->value);
+ element_node->value = value;
+ }
+ }
+
+ return perf_configset_write_in_full(config_file_name);
+}
+
static int collect_current_config(const char *var, const char *value,
void *cb __maybe_unused)
{
@@ -557,7 +586,7 @@ static int show_all_config(void)
return 0;
}

-static int perf_configset_with_option(configset_fn_t fn, const char *var)
+static int perf_configset_with_option(configset_fn_t fn, const char *var, char *value)
{
char *section_name;
char *name;
@@ -585,8 +614,18 @@ static int perf_configset_with_option(configset_fn_t fn, const char *var)
section_name = strsep(&key, ".");
name = strsep(&key, ".");
free(key);
+ if (!value) {
+ /* do nothing */
+ } else if (!strcmp(value, "=")) {
+ pr_err("The config variable does not contain a value: %s.%s\n",
+ section_name, name);
+ return -1;
+ } else {
+ value++;
+ name = strsep(&name, "=");
+ }

- return fn(section_name, name);
+ return fn(section_name, name, value);

pr_err("invalid key: %s\n", var);
return -1;
@@ -625,7 +664,13 @@ int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
default:
if (argc) {
for (i = 0; argv[i]; i++) {
- ret = perf_configset_with_option(show_spec_config, argv[i]);
+ char *value = strchr(argv[i], '=');
+ if (value == NULL)
+ ret = perf_configset_with_option(show_spec_config,
+ argv[i], value);
+ else
+ ret = perf_configset_with_option(set_config,
+ argv[i], value);
if (ret < 0)
break;
}
diff --git a/tools/perf/util/cache.h b/tools/perf/util/cache.h
index 6fe734c..0b68c89 100644
--- a/tools/perf/util/cache.h
+++ b/tools/perf/util/cache.h
@@ -34,7 +34,8 @@ struct config_section {

struct list_head sections;

-typedef int (*configset_fn_t)(const char *, const char *);
+extern int perf_configset_write_in_full(const char *file_name);
+typedef int (*configset_fn_t)(const char *, const char *, char*);
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 *);
diff --git a/tools/perf/util/config.c b/tools/perf/util/config.c
index 23fa8c5..4c13991 100644
--- a/tools/perf/util/config.c
+++ b/tools/perf/util/config.c
@@ -506,6 +506,33 @@ out:
return ret;
}

+int perf_configset_write_in_full(const char *file_name)
+{
+ struct config_section *section_node;
+ struct config_element *element_node;
+ const char *first_line = "# this file is auto-generated.";
+ FILE *fp = fopen(file_name, "w");
+
+ if (!fp) {
+ pr_err("Error: %s: Can't open this file\n", file_name);
+ return -1;
+ }
+
+ fprintf(fp, "%s\n", first_line);
+ /* overwrite configvariables */
+ list_for_each_entry(section_node, &sections, list) {
+ fprintf(fp, "[%s]\n", section_node->name);
+ list_for_each_entry(element_node, &section_node->element_head, list) {
+ if (element_node->value)
+ fprintf(fp, "\t%s = %s\n",
+ element_node->name, element_node->value);
+ }
+ }
+ fclose(fp);
+
+ return 0;
+}
+
/*
* Call this to report error for your variable that should not
* get a boolean value (i.e. "[my] var" means "true").
--
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/