Re: [PATCH v4.9] sched/fair: Overload-On-Wakeup fix.
From: Peter Zijlstra
Date: Wed Mar 15 2017 - 08:28:07 EST
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.