Re: [PATCH 3/3] sched: limit cpu search and rotate search window for scalability

From: Peter Zijlstra
Date: Tue Apr 24 2018 - 08:52:28 EST

On Mon, Apr 23, 2018 at 05:41:16PM -0700, subhra mazumdar wrote:
> Lower the lower limit of idle cpu search in select_idle_cpu() and also put
> an upper limit. This helps in scalability of the search by restricting the
> search window. Also rotating the search window with help of next_cpu
> ensures any idle cpu is eventually found in case of high load.

So this patch does 2 (possibly 3) things, that's not good.