diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/cgroup/freezer.c | 30 |
1 files changed, 14 insertions, 16 deletions
diff --git a/kernel/cgroup/freezer.c b/kernel/cgroup/freezer.c index 617861a54793..188d5f2aeb5a 100644 --- a/kernel/cgroup/freezer.c +++ b/kernel/cgroup/freezer.c @@ -260,8 +260,10 @@ void cgroup_freezer_migrate_task(struct task_struct *task, void cgroup_freeze(struct cgroup *cgrp, bool freeze) { struct cgroup_subsys_state *css; + struct cgroup *parent; struct cgroup *dsct; bool applied = false; + bool old_e; lockdep_assert_held(&cgroup_mutex); @@ -282,22 +284,18 @@ void cgroup_freeze(struct cgroup *cgrp, bool freeze) if (cgroup_is_dead(dsct)) continue; - if (freeze) { - dsct->freezer.e_freeze++; - /* - * Already frozen because of ancestor's settings? - */ - if (dsct->freezer.e_freeze > 1) - continue; - } else { - dsct->freezer.e_freeze--; - /* - * Still frozen because of ancestor's settings? - */ - if (dsct->freezer.e_freeze > 0) - continue; - - WARN_ON_ONCE(dsct->freezer.e_freeze < 0); + /* + * e_freeze is affected by parent's e_freeze and dst's freeze. + * If old e_freeze eq new e_freeze, no change, its children + * will not be affected. So do nothing and skip the subtree + */ + old_e = dsct->freezer.e_freeze; + parent = cgroup_parent(dsct); + dsct->freezer.e_freeze = (dsct->freezer.freeze || + parent->freezer.e_freeze); + if (dsct->freezer.e_freeze == old_e) { + css = css_rightmost_descendant(css); + continue; } /* |