diff options
| -rw-r--r-- | Documentation/cgroup-v2.txt | 18 | ||||
| -rw-r--r-- | kernel/cgroup/cgroup.c | 16 |
2 files changed, 34 insertions, 0 deletions
diff --git a/Documentation/cgroup-v2.txt b/Documentation/cgroup-v2.txt index 46ec3f76211c..dc44785dc0fa 100644 --- a/Documentation/cgroup-v2.txt +++ b/Documentation/cgroup-v2.txt @@ -868,6 +868,24 @@ All cgroup core files are prefixed with "cgroup." If the actual descent depth is equal or larger, an attempt to create a new child cgroup will fail. + cgroup.stat + A read-only flat-keyed file with the following entries: + + nr_descendants + Total number of visible descendant cgroups. + + nr_dying_descendants + Total number of dying descendant cgroups. A cgroup becomes + dying after being deleted by a user. The cgroup will remain + in dying state for some time undefined time (which can depend + on system load) before being completely destroyed. + + A process can't enter a dying cgroup under any circumstances, + a dying cgroup can't revive. + + A dying cgroup can consume system resources not exceeding + limits, which were active at the moment of cgroup deletion. + Controllers =========== diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c index 0fd9134e1720..a06755a610e1 100644 --- a/kernel/cgroup/cgroup.c +++ b/kernel/cgroup/cgroup.c @@ -3304,6 +3304,18 @@ static int cgroup_events_show(struct seq_file *seq, void *v) return 0; } +static int cgroup_stats_show(struct seq_file *seq, void *v) +{ + struct cgroup *cgroup = seq_css(seq)->cgroup; + + seq_printf(seq, "nr_descendants %d\n", + cgroup->nr_descendants); + seq_printf(seq, "nr_dying_descendants %d\n", + cgroup->nr_dying_descendants); + + return 0; +} + static int cgroup_file_open(struct kernfs_open_file *of) { struct cftype *cft = of->kn->priv; @@ -4407,6 +4419,10 @@ static struct cftype cgroup_base_files[] = { .seq_show = cgroup_max_depth_show, .write = cgroup_max_depth_write, }, + { + .name = "cgroup.stat", + .seq_show = cgroup_stats_show, + }, { } /* terminate */ }; |