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Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics

From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics
Date 2017-06-01 17:20 +0200
Message-ID <tNA3f-4do-13@gated-at.bofh.it> (permalink)
References (3 earlier) <tJZ9U-8vX-11@gated-at.bofh.it> <tKLex-72S-7@gated-at.bofh.it> <tKLRf-7y3-9@gated-at.bofh.it> <tKM0W-7Bg-9@gated-at.bofh.it> <tNzJU-3Qo-25@gated-at.bofh.it>
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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.

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Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Tejun Heo <tj@kernel.org> - 2017-06-01 17:00 +0200
  Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Peter Zijlstra <peterz@infradead.org> - 2017-06-01 17:20 +0200
    Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Tejun Heo <tj@kernel.org> - 2017-06-01 17:40 +0200
    Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Waiman Long <longman@redhat.com> - 2017-06-01 20:50 +0200
      Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Tejun Heo <tj@kernel.org> - 2017-06-01 20:50 +0200
        Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Waiman Long <longman@redhat.com> - 2017-06-01 21:30 +0200
          Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Tejun Heo <tj@kernel.org> - 2017-06-01 22:40 +0200
            Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Waiman Long <longman@redhat.com> - 2017-06-01 22:50 +0200
              Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Tejun Heo <tj@kernel.org> - 2017-06-01 23:00 +0200
                Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Tejun Heo <tj@kernel.org> - 2017-06-01 23:20 +0200
                Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Waiman Long <longman@redhat.com> - 2017-06-02 22:40 +0200
                Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Tejun Heo <tj@kernel.org> - 2017-06-03 12:40 +0200
                Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Waiman Long <longman@redhat.com> - 2017-06-01 23:20 +0200
      Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Waiman Long <longman@redhat.com> - 2017-06-01 22:00 +0200
    Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Waiman Long <longman@redhat.com> - 2017-06-01 22:20 +0200
  Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Waiman Long <longman@redhat.com> - 2017-06-01 20:50 +0200

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