[PATCH 7/8] cgroup: mount cgroupns-root when inside non-init cgroupns
Serge E. Hallyn
serge.hallyn at ubuntu.com
Wed Dec 2 16:56:37 UTC 2015
On Wed, Dec 02, 2015 at 11:53:12AM -0500, Tejun Heo wrote:
> Hello, Serge.
>
> On Tue, Dec 01, 2015 at 03:58:53PM -0600, Serge E. Hallyn wrote:
> > I mispoke before though - it's not the hierarchy's root dentry,
> > but rather a dentry for a descendent cgroup which will become the
> > root dentry for the new superblock. We do know that there must be
> > a css_set with a cgroup. I'm still trying to track down whether
> > that cgrou's inode's dentry can ever be flushed. I would think
> > not but am not sure.
>
> Hmmm... I'm not really following. The inode can be flushed and that's
> why it needs to be walked down from root. What am I missing here?
Can it be flushed when we know that the cgroup is being pinned by
a css_set? (There's either a task or a cgroup_namespace pinning it
or we wouldn't get here)
-serge
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