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

[Subhra Mazumdar]

On 7/8/19 10:24 AM, 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.
I believe this can co-exist with latency-nice? We can derive the 'nr' in
select_idle_cpu from latency-nice and use the new mask to iterate.