cgroup: extend comment on what unit_release_cgroup() is for

diff --git a/src/core/cgroup.c b/src/core/cgroup.c
index 988813c..3803231 100644 (file)
--- a/src/core/cgroup.c
+++ b/src/core/cgroup.c
@@ -2005,7 +2005,8 @@ int unit_realize_cgroup(Unit *u) {
 void unit_release_cgroup(Unit *u) {
         assert(u);
 
-        /* Forgets all cgroup details for this cgroup */
+        /* Forgets all cgroup details for this cgroup — but does *not* destroy the cgroup. This is hence OK to call
+         * when we close down everything for reexecution, where we really want to leave the cgroup in place. */
 
         if (u->cgroup_path) {
                 (void) hashmap_remove(u->manager->cgroup_unit, u->cgroup_path);