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Re: [PATCHSET for-4.11] cgroup: implement cgroup v2 thread mode

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On Thu, Feb 02, 2017 at 04:52:29PM -0500, Tejun Heo wrote:

> > Why do you need to manually turn it on?  That is, couldn't it be
> > automatic based on what controllers are enabled?
> 
> This came up already but it's not like some controllers are inherently
> thread-only.  Consider CPU, all in-context CPU cycle consumptions are
> tied to the thread; however, we also want to be able to account for
> CPU cycles consumed for, for example, memory reclaim or encryption
> during writeback.
> 
> I played with an interface where thread mode is enabled automatically
> upto the common ancestor of the threads but not only was it
> complicated to implement but also the eventual behavior was very
> confusing as the resource domain can change without any active actions
> from the user.  I think keeping things simple is the right choice
> here.

Note that the explicit marking of the resource domains gets you exactly
that. But let me reply in the other subthread.

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[PATCHSET for-4.11] cgroup: implement cgroup v2 thread mode Tejun Heo <tj@kernel.org> - 2017-02-02 21:10 +0100
  [PATCH 4/5] cgroup: implement CSS_TASK_ITER_THREADED Tejun Heo <tj@kernel.org> - 2017-02-02 21:10 +0100
  Re: [PATCHSET for-4.11] cgroup: implement cgroup v2 thread mode Andy Lutomirski <luto@amacapital.net> - 2017-02-02 22:40 +0100
    Re: [PATCHSET for-4.11] cgroup: implement cgroup v2 thread mode Tejun Heo <tj@kernel.org> - 2017-02-02 23:00 +0100
      Re: [PATCHSET for-4.11] cgroup: implement cgroup v2 thread mode Andy Lutomirski <luto@amacapital.net> - 2017-02-03 22:20 +0100
        Re: [PATCHSET for-4.11] cgroup: implement cgroup v2 thread mode Tejun Heo <tj@kernel.org> - 2017-02-03 23:00 +0100
      Re: [PATCHSET for-4.11] cgroup: implement cgroup v2 thread mode Peter Zijlstra <peterz@infradead.org> - 2017-02-06 11:00 +0100
  Re: [PATCHSET for-4.11] cgroup: implement cgroup v2 thread mode Peter Zijlstra <peterz@infradead.org> - 2017-02-03 21:30 +0100
    Re: [PATCHSET for-4.11] cgroup: implement cgroup v2 thread mode Tejun Heo <tj@kernel.org> - 2017-02-03 22:10 +0100
      Re: [PATCHSET for-4.11] cgroup: implement cgroup v2 thread mode Peter Zijlstra <peterz@infradead.org> - 2017-02-06 14:00 +0100
        Re: [PATCHSET for-4.11] cgroup: implement cgroup v2 thread mode Tejun Heo <tj@kernel.org> - 2017-02-09 01:10 +0100
          Re: [PATCHSET for-4.11] cgroup: implement cgroup v2 thread mode Peter Zijlstra <peterz@infradead.org> - 2017-02-09 11:30 +0100
            Re: [PATCHSET for-4.11] cgroup: implement cgroup v2 thread mode Tejun Heo <tj@kernel.org> - 2017-02-10 17:20 +0100
              Re: [PATCHSET for-4.11] cgroup: implement cgroup v2 thread mode Peter Zijlstra <peterz@infradead.org> - 2017-02-10 19:00 +0100
                Re: [PATCHSET for-4.11] cgroup: implement cgroup v2 thread mode Tejun Heo <tj@kernel.org> - 2017-02-12 06:10 +0100
                Re: [PATCHSET for-4.11] cgroup: implement cgroup v2 thread mode Mike Galbraith <efault@gmx.de> - 2017-02-12 08:10 +0100
                Re: [PATCHSET for-4.11] cgroup: implement cgroup v2 thread mode Mike Galbraith <efault@gmx.de> - 2017-02-13 06:50 +0100
  Re: [PATCHSET for-4.11] cgroup: implement cgroup v2 thread mode Paul Turner <pjt@google.com> - 2017-02-09 15:10 +0100
    Re: [PATCHSET for-4.11] cgroup: implement cgroup v2 thread mode Peter Zijlstra <peterz@infradead.org> - 2017-02-09 15:50 +0100
      Re: [PATCHSET for-4.11] cgroup: implement cgroup v2 thread mode Mike Galbraith <efault@gmx.de> - 2017-02-09 16:20 +0100
      Re: [PATCHSET for-4.11] cgroup: implement cgroup v2 thread mode Mike Galbraith <efault@gmx.de> - 2017-02-13 06:40 +0100
    Re: [PATCHSET for-4.11] cgroup: implement cgroup v2 thread mode Tejun Heo <tj@kernel.org> - 2017-02-10 17:00 +0100

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