Re: [PATCHSET RFC cgroup/for-4.6] cgroup, sched: implement resource group and PRIO_RGRP

From	Mike Galbraith <umgwanakikbuti@gmail.com>
Newsgroups	linux.kernel
Subject	Re: [PATCHSET RFC cgroup/for-4.6] cgroup, sched: implement resource group and PRIO_RGRP
Date	2016-04-14 08:10 +0200
Message-ID	<rnIDw-5In-13@gated-at.bofh.it> (permalink)
References	(6 earlier) <rlL2O-Ou-19@gated-at.bofh.it> <rm1hg-5Mq-15@gated-at.bofh.it> <rneYO-6JD-1@gated-at.bofh.it> <rnnIK-64i-7@gated-at.bofh.it> <rnvwE-3Pk-49@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Wed, 2016-04-13 at 11:59 -0400, Tejun Heo wrote:
> Hello, Mike.
> 
> On Wed, Apr 13, 2016 at 09:43:01AM +0200, Mike Galbraith wrote:
> > > The cost is part aesthetical and part practical.  While less
> > > elegant
> > > than tree of uniform objects, it seems a stretch to call internal
> > > /
> > > leaf node distinction broken especially given that the model is
> > > natural to some controllers.
> > 
> > That justifies prohibiting proper usages of three controllers, cpu,
> > cpuacct and cpuset?
> 
> Neither cpuacct or cpuset loses any capability from the constraint as
> there is no difference between tasks being in an internal cgroup or a
> leaf cgroup nested under it.  The only practical impact is that we
> lose the ability to let internal tasks compete against sibling cgroups
> for proportional control.

I'm not getting it.

A.  entity = task[s] | cgroup[s]
B.  entity = task[s] ^ cgroup[s]

A I get, B I don't, but you seem to be saying B, else we get the task
competes with sibling cgroup business.

Let /foo be an exclusive cpuset containing exclusive subset bar.  How can any task acquire set foo affinity if B really really applies?  My box calls me a dummy if I try to create a "proper" home for tasks, one with both no snobby neighbors and proper affinity.

	-Mike

Thread

Re: [PATCHSET RFC cgroup/for-4.6] cgroup, sched: implement resource  group and PRIO_RGRP Tejun Heo <tj@kernel.org> - 2016-04-06 18:00 +0200
  Re: [PATCHSET RFC cgroup/for-4.6] cgroup, sched: implement resource  group and PRIO_RGRP Peter Zijlstra <peterz@infradead.org> - 2016-04-07 08:50 +0200
    Re: [PATCHSET RFC cgroup/for-4.6] cgroup, sched: implement resource  group and PRIO_RGRP Johannes Weiner <hannes@cmpxchg.org> - 2016-04-07 09:40 +0200
      Re: [PATCHSET RFC cgroup/for-4.6] cgroup, sched: implement resource  group and PRIO_RGRP Peter Zijlstra <peterz@infradead.org> - 2016-04-07 10:10 +0200
        Re: [PATCHSET RFC cgroup/for-4.6] cgroup, sched: implement resource  group and PRIO_RGRP Johannes Weiner <hannes@cmpxchg.org> - 2016-04-07 11:30 +0200
          Re: [PATCHSET RFC cgroup/for-4.6] cgroup, sched: implement resource  group and PRIO_RGRP Peter Zijlstra <peterz@infradead.org> - 2016-04-07 12:50 +0200
        Re: [PATCHSET RFC cgroup/for-4.6] cgroup, sched: implement resource  group and PRIO_RGRP Tejun Heo <tj@kernel.org> - 2016-04-07 21:50 +0200
          Re: [PATCHSET RFC cgroup/for-4.6] cgroup, sched: implement resource  group and PRIO_RGRP Peter Zijlstra <peterz@infradead.org> - 2016-04-07 22:30 +0200
            Re: [PATCHSET RFC cgroup/for-4.6] cgroup, sched: implement resource  group and PRIO_RGRP Tejun Heo <tj@kernel.org> - 2016-04-08 22:20 +0200
              Re: [PATCHSET RFC cgroup/for-4.6] cgroup, sched: implement resource  group and PRIO_RGRP Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-04-09 08:20 +0200
              Re: [PATCHSET RFC cgroup/for-4.6] cgroup, sched: implement resource  group and PRIO_RGRP Peter Zijlstra <peterz@infradead.org> - 2016-04-09 15:40 +0200
                Re: [PATCHSET RFC cgroup/for-4.6] cgroup, sched: implement resource  group and PRIO_RGRP Tejun Heo <tj@kernel.org> - 2016-04-13 00:30 +0200
                Re: [PATCHSET RFC cgroup/for-4.6] cgroup, sched: implement resource  group and PRIO_RGRP Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-04-13 09:50 +0200
                Re: [PATCHSET RFC cgroup/for-4.6] cgroup, sched: implement resource  group and PRIO_RGRP Tejun Heo <tj@kernel.org> - 2016-04-13 18:10 +0200
                Re: [PATCHSET RFC cgroup/for-4.6] cgroup, sched: implement resource  group and PRIO_RGRP Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-04-13 21:20 +0200
                Re: [PATCHSET RFC cgroup/for-4.6] cgroup, sched: implement resource  group and PRIO_RGRP Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-04-14 08:10 +0200
                Re: [PATCHSET RFC cgroup/for-4.6] cgroup, sched: implement resource  group and PRIO_RGRP Tejun Heo <tj@kernel.org> - 2016-04-14 22:00 +0200
                Re: [PATCHSET RFC cgroup/for-4.6] cgroup, sched: implement resource  group and PRIO_RGRP Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-04-15 04:50 +0200
              Re: [PATCHSET RFC cgroup/for-4.6] cgroup, sched: implement resource  group and PRIO_RGRP Peter Zijlstra <peterz@infradead.org> - 2016-04-09 18:10 +0200
      Re: [PATCHSET RFC cgroup/for-4.6] cgroup, sched: implement resource  group and PRIO_RGRP Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-04-07 10:10 +0200
      Re: [PATCHSET RFC cgroup/for-4.6] cgroup, sched: implement resource  group and PRIO_RGRP Peter Zijlstra <peterz@infradead.org> - 2016-04-07 10:30 +0200
        Re: [PATCHSET RFC cgroup/for-4.6] cgroup, sched: implement resource  group and PRIO_RGRP Johannes Weiner <hannes@cmpxchg.org> - 2016-04-07 21:10 +0200
          Re: [PATCHSET RFC cgroup/for-4.6] cgroup, sched: implement resource  group and PRIO_RGRP Peter Zijlstra <peterz@infradead.org> - 2016-04-07 21:40 +0200
            Re: [PATCHSET RFC cgroup/for-4.6] cgroup, sched: implement resource  group and PRIO_RGRP Johannes Weiner <hannes@cmpxchg.org> - 2016-04-07 22:30 +0200
              Re: [PATCHSET RFC cgroup/for-4.6] cgroup, sched: implement resource  group and PRIO_RGRP Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-04-08 05:20 +0200

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