Re: [rfc patch] sched/fair: Use instantaneous load for fork/exec balancing

From	Matt Fleming <matt@codeblueprint.co.uk>
Newsgroups	linux.kernel
Subject	Re: [rfc patch] sched/fair: Use instantaneous load for fork/exec balancing
Date	2016-07-12 13:20 +0200
Message-ID	<rU3Tj-48p-21@gated-at.bofh.it> (permalink)
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On Mon, 11 Jul, at 09:58:52AM, Dietmar Eggemann wrote:
> This difference in the initial se->avg.load_avg value [0 or 1024] has an
> influence in wake_affine() [weight = p->se.avg.load_avg;] for the wakeup
> handling of the hackbench tasks in the 'send/receive data' phase.

The way I was running hackbench made it very susceptible to changes in
fork behaviour, i.e. running it with a small number of loops.

> There are a couple of patches on tip/sched/core which might change the
> behaviour of this: fork path, no double attach_entity_load_avg for new
> task, no remove_entity_load_avg for new task, changes in effective_load ...

Indeed they do! Things are much improved when running the latest
tip/sched/core, thanks for the pointer.

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Re: [rfc patch] sched/fair: Use instantaneous load for fork/exec  balancing Dietmar Eggemann <dietmar.eggemann@arm.com> - 2016-07-11 11:00 +0200
  Re: [rfc patch] sched/fair: Use instantaneous load for fork/exec  balancing Matt Fleming <matt@codeblueprint.co.uk> - 2016-07-12 13:20 +0200

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