Before this patch (in a fresh system):
# cat /proc/$$/cgroup
# mount -t cgroup -o __DEVEL__sane_behavior xxx /cgroup
# umount /cgroup
# cat /proc/$$/cgroup
0:cpuset,cpu,cpuacct,memory,devices,freezer,net_cls,blkio,perf_event,net_prio,hugetlb:/
After this patch (in a fresh system):
# cat ...
# mount ...
# umount ...
# cat /proc/$$/cgroup
#
You won't see the default root after it's umounted.
Signed-off-by: Li Zefan <lize...@huawei.com>
---
kernel/cgroup.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index f73fe48..dabc486 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1788,6 +1788,8 @@ static void cgroup_kill_sb(struct super_block *sb)
} else {
if (root != &cgrp_dfl_root)
percpu_ref_kill(&root->cgrp.self.refcnt);
+ else
+ cgrp_dfl_root_visible = false;
}
kernfs_kill_sb(sb);
--
1.8.0.2
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