Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for direct descendants

Hello, James.

On Thu, Jul 21, 2016 at 08:16:34AM -0700, James Bottomley wrote:

quoted

That'd be one side.  The other side is the one moving.  Let's say the
system admin thing wants to move all processe from A proper to B.  It
would do that by draining processes from A's procs file into B's and
even that is multistep and can race.

So the second part is that once we allow the creation of
subdirectories, there's no unified tasks file, so there's no way of
draining A proper without enumerating and descending into the cgroupns
created subtrees in A?

Not that.  If it races, it will end up moving processes which are no
longer in A proper.  Such operations or distinctions might not be
meaningful under many circumstances but it'd be a pretty big hole in
the API to create and I can't really declare these holes are gonna be
okay with confidence.

Thanks.

-- 
tejun