Re: [PATCH v2 2/2] sched/fair: leverage the idle state info when choosing the "idlest" cpu

[Rik van Riel]

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On 09/04/2014 11:32 AM, Nicolas Pitre wrote:
> The code in find_idlest_cpu() looks for the CPU with the smallest
> load. However, if multiple CPUs are idle, the first idle CPU is
> selected irrespective of the depth of its idle state.
> 
> Among the idle CPUs we should pick the one with with the shallowest
> idle state, or the latest to have gone idle if all idle CPUs are in
> the same state.  The later applies even when cpuidle is configured
> out.
> 
> This patch doesn't cover the following issues:

The main thing it does not cover is already running tasks that
get woken up again, since select_idle_sibling() covers everything
except for newly forked and newly executed tasks.

I am looking at adding similar logic to select_idle_sibling()

- -- 
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