Messages in this thread | | | Date | Mon, 30 Nov 2015 23:09:53 +0100 | From | Peter Zijlstra <> | Subject | Re: [RFC PATCH 3/3] sched/fair: Use different cachelines for readers and writers of load_avg |
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On Mon, Nov 30, 2015 at 02:13:32PM -0500, Waiman Long wrote: > >This begs the question tough; why are you running a global load in a > >cgroup; and do we really need to update this for the root cgroup? It > >seems to me we don't need calc_tg_weight() for the root cgroup, it > >doesn't need to normalize its weight numbers. > > > >That is; isn't this simply a problem we should avoid? > > I didn't use any cgroup in my test setup. Autogroup was enabled, though. > Booting up a 4.4-rc2 kernel caused sched_create_group() to be called 56 > times.
Yeah, can you kill autogroup and see if that helps? If not, we probably should add some code to avoid calculating things for the root group.
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