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cgroup-util: when attaching/creating cgroups in multiple hierarchies, take jointly mounted controlelrs into account 

If we create a cgroup in one controller it might already have been
created in another too, if we have jointly mounted controllers. Take
that into consideration.
This commit is contained in:
Lennart Poettering 2018-11-15 21:16:57 +01:00
parent fae9bc298a
commit e353faa0d6
1 changed files with 36 additions and 14 deletions
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50
src/basic/cgroup-util.c
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@ -2110,6 +2110,7 @@ done:
int cg_create_everywhere(CGroupMask supported, CGroupMask mask, const char *path) {
CGroupController c;
CGroupMask done;
bool created;
int r;
@ -2134,20 +2135,28 @@ int cg_create_everywhere(CGroupMask supported, CGroupMask mask, const char *path
if (r > 0)
return created;
supported &= CGROUP_MASK_V1;
mask = CGROUP_MASK_EXTEND_JOINED(mask);
done = 0;
/* Otherwise, do the same in the other hierarchies */
for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c);
const char *n;
if (!FLAGS_SET(CGROUP_MASK_V1, bit))
if (!FLAGS_SET(supported, bit))
continue;
if (FLAGS_SET(done, bit))
continue;
n = cgroup_controller_to_string(c);
if (FLAGS_SET(mask, bit))
(void) cg_create(n, path);
else if (FLAGS_SET(supported, bit))
else
(void) cg_trim(n, path, true);
done |= CGROUP_MASK_EXTEND_JOINED(bit);
}
return created;
@ -2155,6 +2164,7 @@ int cg_create_everywhere(CGroupMask supported, CGroupMask mask, const char *path
int cg_attach_everywhere(CGroupMask supported, const char *path, pid_t pid, cg_migrate_callback_t path_callback, void *userdata) {
CGroupController c;
CGroupMask done;
int r;
r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, path, pid);
@ -2167,23 +2177,26 @@ int cg_attach_everywhere(CGroupMask supported, const char *path, pid_t pid, cg_m
if (r > 0)
return 0;
supported &= CGROUP_MASK_V1;
done = 0;
for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c);
const char *p = NULL;
if (!FLAGS_SET(CGROUP_MASK_V1, bit))
if (!FLAGS_SET(supported, bit))
continue;
if (!FLAGS_SET(supported, bit))
if (FLAGS_SET(done, bit))
continue;
if (path_callback)
p = path_callback(bit, userdata);
if (!p)
p = path;
(void) cg_attach_fallback(cgroup_controller_to_string(c), p, pid);
done |= CGROUP_MASK_EXTEND_JOINED(bit);
}
return 0;
@ -2208,6 +2221,7 @@ int cg_attach_many_everywhere(CGroupMask supported, const char *path, Set* pids,
int cg_migrate_everywhere(CGroupMask supported, const char *from, const char *to, cg_migrate_callback_t to_callback, void *userdata) {
CGroupController c;
CGroupMask done;
int r = 0, q;
if (!path_equal(from, to)) {
@ -2222,30 +2236,34 @@ int cg_migrate_everywhere(CGroupMask supported, const char *from, const char *to
if (q > 0)
return r;
supported &= CGROUP_MASK_V1;
done = 0;
for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c);
const char *p = NULL;
if (!FLAGS_SET(CGROUP_MASK_V1, bit))
if (!FLAGS_SET(supported, bit))
continue;
if (!FLAGS_SET(supported, bit))
if (FLAGS_SET(done, bit))
continue;
if (to_callback)
p = to_callback(bit, userdata);
if (!p)
p = to;
(void) cg_migrate_recursive_fallback(SYSTEMD_CGROUP_CONTROLLER, to, cgroup_controller_to_string(c), p, 0);
done |= CGROUP_MASK_EXTEND_JOINED(bit);
}
return 0;
return r;
}
int cg_trim_everywhere(CGroupMask supported, const char *path, bool delete_root) {
CGroupController c;
CGroupMask done;
int r, q;
r = cg_trim(SYSTEMD_CGROUP_CONTROLLER, path, delete_root);
@ -2258,19 +2276,23 @@ int cg_trim_everywhere(CGroupMask supported, const char *path, bool delete_root)
if (q > 0)
return r;
supported &= CGROUP_MASK_V1;
done = 0;
for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c);
if (!FLAGS_SET(CGROUP_MASK_V1, bit))
continue;
if (!FLAGS_SET(supported, bit))
continue;
if (FLAGS_SET(done, bit))
continue;
(void) cg_trim(cgroup_controller_to_string(c), path, delete_root);
done |= CGROUP_MASK_EXTEND_JOINED(bit);
}
return 0;
return r;
}
int cg_mask_to_string(CGroupMask mask, char **ret) {