Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy

From	Tejun Heo <tj@kernel.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy
Date	2015-08-24 23:10 +0200
Message-ID	<q17ab-2Ep-37@gated-at.bofh.it> (permalink)
References	(5 earlier) <q00aK-4yo-29@gated-at.bofh.it> <q0lRT-1MU-1@gated-at.bofh.it> <q12au-3Av-11@gated-at.bofh.it> <q13pV-5xE-21@gated-at.bofh.it> <q170u-2dD-9@gated-at.bofh.it>
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Hello,

On Mon, Aug 24, 2015 at 01:54:08PM -0700, Paul Turner wrote:
> > That alone doesn't require hierarchical resource distribution tho.
> > Setting nice levels reasonably is likely to alleviate most of the
> > problem.
> 
> Nice is not sufficient here.  There could be arbitrarily many threads
> within the hypervisor that are not actually hosting guest CPU threads.
> The only way to have this competition occur at a reasonably fixed
> ratio is a sub-hierarchy.

I get that having hierarchy of threads would be nicer but am having a
bit of difficulty seeing why adjusting priorities of threads wouldn't
be sufficient.  It's not like threads of the same process competing
with each other is a new problem.  People have been dealing with it
for ages.  Hierarchical management can be a nice plus but we want the
problem and proposed solution to be justifiable.

Thanks.

-- 
tejun
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Thread

Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy Paul Turner <pjt@google.com> - 2015-08-21 21:30 +0200
  Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-22 20:40 +0200
    Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Austin S Hemmelgarn <ahferroin7@gmail.com> - 2015-08-24 17:50 +0200
      Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-24 19:10 +0200
        Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-08-24 21:30 +0200
        Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Austin S Hemmelgarn <ahferroin7@gmail.com> - 2015-08-24 22:10 +0200
          Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-24 22:30 +0200
            Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy Paul Turner <pjt@google.com> - 2015-08-24 23:10 +0200
              Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-24 23:20 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy Paul Turner <pjt@google.com> - 2015-08-24 23:20 +0200
        Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy Paul Turner <pjt@google.com> - 2015-08-24 23:00 +0200
          Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-24 23:10 +0200
            Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-24 23:20 +0200
              Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy Paul Turner <pjt@google.com> - 2015-08-24 23:30 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-24 23:50 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy Paul Turner <pjt@google.com> - 2015-08-25 00:10 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-25 01:00 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy Paul Turner <pjt@google.com> - 2015-08-25 01:20 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> - 2015-08-25 04:40 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-25 23:20 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Ingo Molnar <mingo@kernel.org> - 2015-08-25 11:30 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Peter Zijlstra <peterz@infradead.org> - 2015-08-25 12:10 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-25 21:20 +0200
            Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy Paul Turner <pjt@google.com> - 2015-08-24 23:20 +0200
    Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy Paul Turner <pjt@google.com> - 2015-08-24 23:00 +0200
      Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-24 23:40 +0200
        Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy Paul Turner <pjt@google.com> - 2015-08-25 00:00 +0200
          Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-25 00:20 +0200
            Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy Paul Turner <pjt@google.com> - 2015-08-25 01:10 +0200
              Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-25 23:10 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-09-02 19:10 +0200

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