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authorTaeung Song <treeze.taeung@gmail.com>2016-11-04 15:44:20 +0900
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-11-14 13:08:11 -0300
commitc6fc018a7a64c2c3ea56529fd8d0ca0f43408b0f (patch)
treeaa04093a5c7428ccca5cb8b8b5c498cb537445a4 /tools/perf/builtin-config.c
parent36662794bb520be828df8e2f3404264f5e7a7973 (diff)
perf config: Add support setting variables in a config file
Add setting feature that can add config variables with their values to a config file (i.e. user or system config file) or modify config key-value pairs in a config file. For the syntax examples: perf config [<file-option>] [section.name[=value] ...] e.g. You can set the ui.show-headers to false with # perf config ui.show-headers=false If you want to add or modify several config items, you can do like # perf config annotate.show_nr_jumps=false kmem.default=slab Committer notes: Testing it: $ perf config -l top.children=true report.children=false $ $ perf config top.children=false $ perf config -l top.children=false report.children=false $ $ perf config kmem.default=slab $ perf config -l top.children=false report.children=false kmem.default=slab $ Signed-off-by: Taeung Song <treeze.taeung@gmail.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Nambong Ha <over3025@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Wang Nan <wangnan0@huawei.com> Cc: Wookje Kwon <aweee0@gmail.com> Link: http://lkml.kernel.org/r/1478241862-31230-5-git-send-email-treeze.taeung@gmail.com [ Combined patch with docs update with this one ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/builtin-config.c')
-rw-r--r--tools/perf/builtin-config.c68
1 files changed, 62 insertions, 6 deletions
diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
index 88a43fe4963c..7c861b54f3a6 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 * const config_usage[] = {
- "perf config [<file-option>] [options] [section.name ...]",
+ "perf config [<file-option>] [options] [section.name[=value] ...]",
NULL
};
@@ -33,6 +33,39 @@ static struct option config_options[] = {
OPT_END()
};
+static int set_config(struct perf_config_set *set, const char *file_name,
+ const char *var, const char *value)
+{
+ struct perf_config_section *section = NULL;
+ struct perf_config_item *item = NULL;
+ const char *first_line = "# this file is auto-generated.";
+ FILE *fp;
+
+ if (set == NULL)
+ return -1;
+
+ fp = fopen(file_name, "w");
+ if (!fp)
+ return -1;
+
+ perf_config_set__collect(set, var, value);
+ fprintf(fp, "%s\n", first_line);
+
+ /* overwrite configvariables */
+ perf_config_items__for_each_entry(&set->sections, section) {
+ fprintf(fp, "[%s]\n", section->name);
+
+ perf_config_items__for_each_entry(&section->items, item) {
+ if (item->value)
+ fprintf(fp, "\t%s = %s\n",
+ item->name, item->value);
+ }
+ }
+ fclose(fp);
+
+ return 0;
+}
+
static int show_spec_config(struct perf_config_set *set, const char *var)
{
struct perf_config_section *section;
@@ -82,7 +115,7 @@ static int show_config(struct perf_config_set *set)
return 0;
}
-static int parse_config_arg(char *arg, char **var)
+static int parse_config_arg(char *arg, char **var, char **value)
{
const char *last_dot = strchr(arg, '.');
@@ -99,7 +132,21 @@ static int parse_config_arg(char *arg, char **var)
return -1;
}
- *var = arg;
+ *value = strchr(arg, '=');
+ if (*value == NULL)
+ *var = arg;
+ else if (!strcmp(*value, "=")) {
+ pr_err("The config variable does not contain a value: %s\n", arg);
+ return -1;
+ } else {
+ *value = *value + 1; /* excluding a first character '=' */
+ *var = strsep(&arg, "=");
+ if (*var[0] == '\0') {
+ pr_err("invalid config variable: %s\n", arg);
+ return -1;
+ }
+ }
+
return 0;
}
@@ -153,7 +200,8 @@ int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
default:
if (argc) {
for (i = 0; argv[i]; i++) {
- char *var, *arg = strdup(argv[i]);
+ char *var, *value;
+ char *arg = strdup(argv[i]);
if (!arg) {
pr_err("%s: strdup failed\n", __func__);
@@ -161,13 +209,21 @@ int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
break;
}
- if (parse_config_arg(arg, &var) < 0) {
+ if (parse_config_arg(arg, &var, &value) < 0) {
free(arg);
ret = -1;
break;
}
- ret = show_spec_config(set, var);
+ if (value == NULL)
+ ret = show_spec_config(set, var);
+ else {
+ const char *config_filename = config_exclusive_filename;
+
+ if (!config_exclusive_filename)
+ config_filename = user_config;
+ ret = set_config(set, config_filename, var, value);
+ }
free(arg);
}
} else