Re: [PATCH 4/4] sched/numa: Do not move imbalanced load purely on the basis of an idle CPU

[Peter Zijlstra]

On Wed, Sep 12, 2018 at 12:24:10PM +0530, Srikar Dronamraju wrote:

> Kernel A = 4.18+ 13 sched patches part of v4.19-rc1.
> Kernel B = Kernel A + 6 patches (http://lore.kernel.org/lkml/1533276841-16341-1-git-send-email-srikar@xxxxxxxxxxxxxxxxxx)
> Kernel C = Kernel B - (Avoid task migration for small numa improvement) i.e
> 	http://lore.kernel.org/lkml/1533276841-16341-4-git-send-email-srikar@xxxxxxxxxxxxxxxxxx
> 	+ 2 patches from Mel
> 	(Do not move imbalanced load purely)
> 	http://lore.kernel.org/lkml/20180907101139.20760-5-mgorman@xxxxxxxxxxxxxxxxxxx
> 	(Stop comparing tasks for NUMA placement)
> 	http://lore.kernel.org/lkml/20180907101139.20760-4-mgorman@xxxxxxxxxxxxxxxxxxx

But that's not a fair comparison :/ You've complicated things by adding
that second patch from Mel.

Now you cannot (unambiguously) tell what the cause for the performance
difference is.