Re: [RFC 0/2] Optimize the idle CPU search

[Peter Zijlstra]

On Mon, Jul 08, 2019 at 10:24:30AM +0530, Parth Shah wrote:
> When searching for an idle_sibling, scheduler first iterates to search for
> an idle core and then for an idle CPU. By maintaining the idle CPU mask
> while iterating through idle cores, we can mark non-idle CPUs for which
> idle CPU search would not have to iterate through again. This is especially
> true in a moderately load system
> 
> Optimize idle CPUs search by marking already found non idle CPUs during
> idle core search. This reduces iteration count when searching for idle
> CPUs, resulting in lower iteration count.

Have you seen these patches:

  https://lkml.kernel.org/r/20180530142236.667774973@xxxxxxxxxxxxx

I've meant to get back to that, but never quite had the time :/