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Subject[PATCH v2] perf: close the opened directories.
When I ran "perf kvm ... top", I encountered the following error output.

Error: perfcounter syscall returned with -1 (Too many open files)

Fatal: No CONFIG_PERF_EVENTS=y kernel support configured?

Looking into perf, I found perf opens too many direcotries at initialization
time, but forgets to close them. Here is the fix.

Signef-off-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
---
tools/perf/util/symbol.c | 17 ++++++++++-------
1 files changed, 10 insertions(+), 7 deletions(-)
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 7fd6b15..3609a20 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1443,6 +1443,7 @@ static int map_groups__set_modules_path_dir(struct map_groups *self,
{
struct dirent *dent;
DIR *dir = opendir(dir_name);
+ int ret = 0;

if (!dir) {
pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
@@ -1465,8 +1466,9 @@ static int map_groups__set_modules_path_dir(struct map_groups *self,

snprintf(path, sizeof(path), "%s/%s",
dir_name, dent->d_name);
- if (map_groups__set_modules_path_dir(self, path) < 0)
- goto failure;
+ ret = map_groups__set_modules_path_dir(self, path);
+ if (ret < 0)
+ goto out;
} else {
char *dot = strrchr(dent->d_name, '.'),
dso_name[PATH_MAX];
@@ -1487,17 +1489,18 @@ static int map_groups__set_modules_path_dir(struct map_groups *self,
dir_name, dent->d_name);

long_name = strdup(path);
- if (long_name == NULL)
- goto failure;
+ if (long_name == NULL) {
+ ret = -1;
+ goto out;
+ }
dso__set_long_name(map->dso, long_name);
dso__kernel_module_get_build_id(map->dso, "");
}
}

- return 0;
-failure:
+out:
closedir(dir);
- return -1;
+ return ret;
}

static char *get_kernel_version(const char *root_dir)
--
1.6.5.2


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