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core: find the closest parent slice that has a specfic cgroup controller enabled when enabling/disabling cgroup controllers for units

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This commit is contained in:
Lennart Poettering 2014-02-17 02:06:32 +01:00
parent 6d2357247b
commit 03b90d4bad
Notes: Lennart Poettering 2014-02-17 15:50:08 +01:00 
Backport: bugfix
3 changed files with 50 additions and 29 deletions
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60
src/core/cgroup.c
View File

@ -448,9 +448,26 @@ void unit_update_cgroup_members_masks(Unit *u) {
}
}
static const char *migrate_callback(CGroupControllerMask mask, void *userdata) {
Unit *u = userdata;
assert(mask != 0);
assert(u);
while (u) {
if (u->cgroup_path &&
u->cgroup_realized &&
(u->cgroup_realized_mask & mask) == mask)
return u->cgroup_path;
u = UNIT_DEREF(u->slice);
}
return NULL;
}
static int unit_create_cgroups(Unit *u, CGroupControllerMask mask) {
_cleanup_free_ char *path;
bool was_in_hash = false;
_cleanup_free_ char *path = NULL;
int r;
assert(u);
@ -460,38 +477,31 @@ static int unit_create_cgroups(Unit *u, CGroupControllerMask mask) {
return log_oom();
r = hashmap_put(u->manager->cgroup_unit, path, u);
if (r == 0)
was_in_hash = true;
else if (r < 0) {
log_error(r == -EEXIST ?
"cgroup %s exists already: %s" : "hashmap_put failed for %s: %s",
path, strerror(-r));
if (r < 0) {
log_error(r == -EEXIST ? "cgroup %s exists already: %s" : "hashmap_put failed for %s: %s", path, strerror(-r));
return r;
}
/* First, create our own group */
r = cg_create_everywhere(u->manager->cgroup_supported, mask, path);
if (r < 0)
log_error("Failed to create cgroup %s: %s", path, strerror(-r));
/* Then, possibly move things over */
if (u->cgroup_path) {
r = cg_migrate_everywhere(u->manager->cgroup_supported, u->cgroup_path, path);
if (r < 0)
log_error("Failed to migrate cgroup from %s to %s: %s",
u->cgroup_path, path, strerror(-r));
}
if (!was_in_hash) {
/* Remember the new data */
free(u->cgroup_path);
if (r > 0) {
u->cgroup_path = path;
path = NULL;
}
/* First, create our own group */
r = cg_create_everywhere(u->manager->cgroup_supported, mask, u->cgroup_path);
if (r < 0) {
log_error("Failed to create cgroup %s: %s", u->cgroup_path, strerror(-r));
return r;
}
/* Keep track that this is now realized */
u->cgroup_realized = true;
u->cgroup_realized_mask = mask;
/* Then, possibly move things over */
r = cg_migrate_everywhere(u->manager->cgroup_supported, u->cgroup_path, u->cgroup_path, migrate_callback, u);
if (r < 0)
log_warning("Failed to migrate cgroup from to %s: %s", u->cgroup_path, strerror(-r));
return 0;
}

15
src/shared/cgroup-util.c
View File

@ -1668,7 +1668,7 @@ int cg_attach_many_everywhere(CGroupControllerMask supported, const char *path,
return r;
}
int cg_migrate_everywhere(CGroupControllerMask supported, const char *from, const char *to) {
int cg_migrate_everywhere(CGroupControllerMask supported, const char *from, const char *to, cg_migrate_callback_t to_callback, void *userdata) {
CGroupControllerMask bit = 1;
const char *n;
int r;
@ -1680,8 +1680,17 @@ int cg_migrate_everywhere(CGroupControllerMask supported, const char *from, cons
}
NULSTR_FOREACH(n, mask_names) {
if (supported & bit)
cg_migrate_recursive_fallback(SYSTEMD_CGROUP_CONTROLLER, to, n, to, false, false);
if (supported & bit) {
const char *p = NULL;
if (to_callback)
p = to_callback(bit, userdata);
if (!p)
p = to;
cg_migrate_recursive_fallback(SYSTEMD_CGROUP_CONTROLLER, to, n, p, false, false);
}
bit <<= 1;
}

4
src/shared/cgroup-util.h
View File

@ -122,10 +122,12 @@ bool cg_controller_is_valid(const char *p, bool allow_named);
int cg_slice_to_path(const char *unit, char **ret);
typedef const char* (*cg_migrate_callback_t)(CGroupControllerMask mask, void *userdata);
int cg_create_everywhere(CGroupControllerMask supported, CGroupControllerMask mask, const char *path);
int cg_attach_everywhere(CGroupControllerMask supported, const char *path, pid_t pid);
int cg_attach_many_everywhere(CGroupControllerMask supported, const char *path, Set* pids);
int cg_migrate_everywhere(CGroupControllerMask supported, const char *from, const char *to);
int cg_migrate_everywhere(CGroupControllerMask supported, const char *from, const char *to, cg_migrate_callback_t callback, void *userdata);
int cg_trim_everywhere(CGroupControllerMask supported, const char *path, bool delete_root);
CGroupControllerMask cg_mask_supported(void);