Re: [PATCH v4.9] sched/fair: Overload-On-Wakeup fix.

From	Peter Zijlstra <peterz@infradead.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH v4.9] sched/fair: Overload-On-Wakeup fix.
Date	2017-03-15 13:30 +0100
Message-ID	<tlgdY-7yR-1@gated-at.bofh.it> (permalink)
References	<tl2kG-6bZ-13@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Tue, Mar 14, 2017 at 11:34:06PM +0200, Jarmo Tiitto wrote:
> Try improve multi-core scaling.
> The changes are experimental - the fix works
> but possible regressions are unknown.
> 
> Please read the orginal author's paper to understand
> the overall problem this patch tries to solve.
> 
> See the orignal patches at:
> https://github.com/jplozi/wastedcores/tree/master/patches
> 
> And the related paper at:
> http://www.i3s.unice.fr/~jplozi/wastedcores/
> 
> v1: the patch was re-written for v4.9 to remove goto statement.
> 
> v2: improved version from the wastedcores initial code. try take into
> 	account the cpu  wake-up latency and choose most recent idle cpu
> 	instead.
> 
> I have tested the code and it really does improve
> multi-core performance on my machine.

v4.9 is not the right kernel to send patches against (hint: v4.10 is not
either).

Also your Changelog is inadequate; it should be self contained, explain
the problem and describe the solution.

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[PATCH v4.9] sched/fair: Overload-On-Wakeup fix. Jarmo Tiitto <jarmo.tiitto@gmail.com> - 2017-03-14 22:40 +0100
  Re: [PATCH v4.9] sched/fair: Overload-On-Wakeup fix. Peter Zijlstra <peterz@infradead.org> - 2017-03-15 13:30 +0100

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