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cgroup: always read the supported controllers from the root cgroup of the local container

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Otherwise we might end up thinking that we support more controllers than
actually enabled for the container we are running in.
This commit is contained in:
Lennart Poettering
2015-09-04 09:07:31 +02:00
parent ba09d9c687
commit 5f4c5fef66
2 changed files with 22 additions and 2 deletions
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src/basic/cgroup-util.c
+10 -2
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@@ -1981,14 +1981,22 @@ int cg_mask_supported(CGroupMask *ret) {
if (unified < 0)
return unified;
if (unified > 0) {
_cleanup_free_ char *controllers = NULL;
_cleanup_free_ char *root = NULL, *controllers = NULL, *path = NULL;
const char *c;
/* In the unified hierarchy we can read the supported
* and accessible controllers from a the top-level
* cgroup attribute */
r = read_one_line_file("/sys/fs/cgroup/cgroup.controllers", &controllers);
r = cg_get_root_path(&root);
if (r < 0)
return r;
r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, root, "cgroup.controllers", &path);
if (r < 0)
return r;
r = read_one_line_file(path, &controllers);
if (r < 0)
return r;