Re: [RFC][PATCH 4/7] sched: Replace sd_busy/nr_busy_cpus with sched_domain_shared

From	Peter Zijlstra <peterz@infradead.org>
Newsgroups	linux.kernel
Subject	Re: [RFC][PATCH 4/7] sched: Replace sd_busy/nr_busy_cpus with sched_domain_shared
Date	2016-05-11 20:20 +0200
Message-ID	<rxGTN-5ei-19@gated-at.bofh.it> (permalink)
References	<rwR4S-3QS-9@gated-at.bofh.it> <rwR4T-3QS-23@gated-at.bofh.it> <rxAY1-7z7-1@gated-at.bofh.it> <rxBAM-8ht-43@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Wed, May 11, 2016 at 02:33:45PM +0200, Peter Zijlstra wrote:
> Do we want to model this co-operative L3 slices thing as a sort of
> node-wide LLC for the purpose of the scheduler ?
> 
> the scheduler does try and scale things by 'assuming' LLC := node.

So this whole series is about selecting idle CPUs to run stuff on. With
the current PPC setup we would never consider placing a task outside of
its core.

If we were to add a node wide cache domain, the scheduler would look to
place a task across cores if there is an idle core to be had.

Would something like that be beneficial?

Thread

[RFC][PATCH 0/7] sched: select_idle_siblings rewrite Peter Zijlstra <peterz@infradead.org> - 2016-05-09 13:00 +0200
  [RFC][PATCH 4/7] sched: Replace sd_busy/nr_busy_cpus with sched_domain_shared Peter Zijlstra <peterz@infradead.org> - 2016-05-09 13:00 +0200
    Re: [RFC][PATCH 4/7] sched: Replace sd_busy/nr_busy_cpus with  sched_domain_shared Matt Fleming <matt@codeblueprint.co.uk> - 2016-05-11 14:00 +0200
      Re: [RFC][PATCH 4/7] sched: Replace sd_busy/nr_busy_cpus with  sched_domain_shared Peter Zijlstra <peterz@infradead.org> - 2016-05-11 14:40 +0200
        Re: [RFC][PATCH 4/7] sched: Replace sd_busy/nr_busy_cpus with  sched_domain_shared Peter Zijlstra <peterz@infradead.org> - 2016-05-11 20:20 +0200
        Re: [RFC][PATCH 4/7] sched: Replace sd_busy/nr_busy_cpus with  sched_domain_shared Peter Zijlstra <peterz@infradead.org> - 2016-05-11 20:30 +0200
          Re: [RFC][PATCH 4/7] sched: Replace sd_busy/nr_busy_cpus with  sched_domain_shared Michael Neuling <mikey@neuling.org> - 2016-05-12 04:10 +0200
            Re: [RFC][PATCH 4/7] sched: Replace sd_busy/nr_busy_cpus with  sched_domain_shared Peter Zijlstra <peterz@infradead.org> - 2016-05-12 07:10 +0200
              Re: [RFC][PATCH 4/7] sched: Replace sd_busy/nr_busy_cpus with  sched_domain_shared Michael Neuling <mikey@neuling.org> - 2016-05-12 13:10 +0200
                Re: [RFC][PATCH 4/7] sched: Replace sd_busy/nr_busy_cpus with  sched_domain_shared Peter Zijlstra <peterz@infradead.org> - 2016-05-12 13:40 +0200
      Re: [RFC][PATCH 4/7] sched: Replace sd_busy/nr_busy_cpus with  sched_domain_shared Peter Zijlstra <peterz@infradead.org> - 2016-05-11 19:40 +0200
        Re: [RFC][PATCH 4/7] sched: Replace sd_busy/nr_busy_cpus with  sched_domain_shared Matt Fleming <matt@codeblueprint.co.uk> - 2016-05-11 20:10 +0200
  [RFC][PATCH 1/7] sched: Remove unused @cpu argument from destroy_sched_domain*() Peter Zijlstra <peterz@infradead.org> - 2016-05-09 13:00 +0200
  [RFC][PATCH 3/7] sched: Introduce struct sched_domain_shared Peter Zijlstra <peterz@infradead.org> - 2016-05-09 13:00 +0200
  [RFC][PATCH 6/7] sched: Optimize SCHED_SMT Peter Zijlstra <peterz@infradead.org> - 2016-05-09 13:00 +0200
  Re: [RFC][PATCH 0/7] sched: select_idle_siblings rewrite Chris Mason <clm@fb.com> - 2016-05-10 03:00 +0200
  Re: [RFC][PATCH 0/7] sched: select_idle_siblings rewrite Chris Mason <clm@fb.com> - 2016-05-11 16:30 +0200

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