Messages in this thread Patch in this message | | | Date | Tue, 3 Jun 2014 12:05:22 +0800 | From | Li Zefan <> | Subject | [PATCH 2/3] cgroup: make the default root invisible when it's umounted |
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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 <lizefan@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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