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

From Paul Turner <pjt@google.com>
Newsgroups linux.kernel
Subject Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy
Date 2015-08-25 00:10 +0200
Message-ID <q186e-46x-13@gated-at.bofh.it> (permalink)
References (6 earlier) <q17ab-2Ep-37@gated-at.bofh.it> <q17jQ-2PJ-7@gated-at.bofh.it> <q17jQ-2PJ-5@gated-at.bofh.it> <q17tx-31O-55@gated-at.bofh.it> <q17MS-3qA-19@gated-at.bofh.it>
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On Mon, Aug 24, 2015 at 2:40 PM, Tejun Heo <tj@kernel.org> wrote:
> On Mon, Aug 24, 2015 at 02:19:29PM -0700, Paul Turner wrote:
>> > Would it be possible for you to give realistic and concrete examples?
>> > I'm not trying to play down the use cases but concrete examples are
>> > usually helpful at putting things in perspective.
>>
>> I don't think there's anything that's not realistic or concrete about
>> the example above.  The "suppose" parts were only for qualifying the
>> pool sizes for vcpu and non-vcpu threads above since discussion of
>> implementation using nice is dependent on knowing these counts.
>
> Hmm... I was hoping for an actual configurations and usage scenarios.
> Preferably something people can set up and play with.

This is much easier to set up and play with synthetically.  Just
create the 10 threads and 100 threads above then experiment with
configurations designed at guaranteeing the set of 100 threads
relatively uniform throughput regardless of how many are active.   I
don't think trying to run a VM stack adds anything except complexity
of reproduction here.

> I take that the
> CPU intensive helper threads are usually IO workers?  Is the scenario
> where the VM is set up with a lot of IO devices and different ones may
> consume large amount of CPU cycles at any given point?

Yes, generally speaking there are a few major classes of IO (flash,
disk, network) that a guest may invoke.  Each of these backends is
separate and chooses its own threading.
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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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