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cgroup: don't recheck all the time whether the systemd hierarchy is mounted, to make strace outputs nicer and save a few stat()s

This commit is contained in:
Lennart Poettering 2011-03-15 21:21:38 +01:00
parent 8f7a3c1402
commit 0ac1082273
1 changed files with 9 additions and 3 deletions
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12
src/cgroup-util.c
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@ -484,6 +484,7 @@ int cg_get_path(const char *controller, const char *path, const char *suffix, ch
const char *p;
char *mp;
int r;
static __thread bool good = false;
assert(controller);
assert(fs);
@ -504,9 +505,14 @@ int cg_get_path(const char *controller, const char *path, const char *suffix, ch
if (asprintf(&mp, "/sys/fs/cgroup/%s", p) < 0)
return -ENOMEM;
if ((r = path_is_mount_point(mp)) <= 0) {
free(mp);
return r < 0 ? r : -ENOENT;
if (!good) {
if ((r = path_is_mount_point(mp)) <= 0) {
free(mp);
return r < 0 ? r : -ENOENT;
}
/* Cache this to save a few stat()s */
good = true;
}
if (path && suffix)