On 06/01/2017 11:10 AM, Peter Zijlstra wrote: > On Thu, Jun 01, 2017 at 10:50:42AM -0400, Tejun Heo wrote: >> Hello, Waiman. >> >> A short update. I tried making root special while keeping the >> existing threaded semantics but I didn't really like it because we >> have to couple controller enables/disables with threaded >> enables/disables. I'm now trying a simpler, albeit a bit more >> tedious, approach which should leave things mostly symmetrical. I'm >> hoping to be able to post mostly working patches this week. > I've not had time to look at any of this. But the question I'm most > curious about is how cgroup-v2 preserves the container invariant. > > That is, each container (namespace) should look like a 'real' machine. > So just like userns allows to have a uid-0 (aka root) for each container > and pidns allows a pid-1 for each container, cgroupns should provide a > root group for each container. > > And cgroup-v2 has this 'exception' (aka wart) for the root group which > needs to be replicated for each namespace. One of the changes that I proposed in my patches was to get rid of the no internal process constraint. I think that will solve a big part of the container invariant problem that we have with cgroup v2. Cheers, Longman -- To unsubscribe from this list: send the line "unsubscribe cgroups" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
