[PATCH v5 2/3] perf config: Once write a config file in the end, not a repeat

[Taeung Song]

Currently set_config() can be repeatedly called for each
input config on the below case:

  $ perf config kmem.default=slab report.children=false ...

But it's a waste, so only once write a config file
gathering all given config key=value pairs

Cc: Jiri Olsa <jo...@kernel.org>
Cc: Namhyung Kim <namhy...@kernel.org>
Signed-off-by: Taeung Song <treeze.tae...@gmail.com>
---
 tools/perf/builtin-config.c | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
index a1d82e3..b89417d 100644
--- a/tools/perf/builtin-config.c
+++ b/tools/perf/builtin-config.c
@@ -34,8 +34,7 @@ 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)
+static int set_config(struct perf_config_set *set, const char *file_name)
 {
        struct perf_config_section *section = NULL;
        struct perf_config_item *item = NULL;
@@ -49,7 +48,6 @@ static int set_config(struct perf_config_set *set, const char 
*file_name,
        if (!fp)
                return -1;
 
-       perf_config_set__collect(set, file_name, var, value);
        fprintf(fp, "%s\n", first_line);
 
        /* overwrite configvariables */
@@ -161,6 +159,7 @@ int cmd_config(int argc, const char **argv)
        struct perf_config_set *set;
        char *user_config = mkpath("%s/.perfconfig", getenv("HOME"));
        const char *config_filename;
+       bool changed = false;
 
        argc = parse_options(argc, argv, config_options, config_usage,
                             PARSE_OPT_STOP_AT_NON_OPTION);
@@ -231,15 +230,26 @@ int cmd_config(int argc, const char **argv)
                                        goto out_err;
                                }
                        } else {
-                               if (set_config(set, config_filename, var, 
value) < 0) {
-                                       pr_err("Failed to set '%s=%s' on %s\n",
-                                              var, value, config_filename);
+                               if (perf_config_set__collect(set, 
config_filename,
+                                                            var, value) < 0) {
+                                       pr_err("Failed to add '%s=%s'\n",
+                                              var, value);
                                        free(arg);
                                        goto out_err;
                                }
+                               changed = true;
                        }
                        free(arg);
                }
+
+               if (!changed)
+                       break;
+
+               if (set_config(set, config_filename) < 0) {
+                       pr_err("Failed to set the configs on %s\n",
+                              config_filename);
+                       goto out_err;
+               }
        }
 
        ret = 0;
-- 
2.7.4