On Sun, Aug 06, 2017 at 05:53:37AM +0000, Ofer Levi(SW) wrote:
> I'm adding hot-plug support for the above arch and ran into performance issue 
> with execution of 
> partition_sched_domains ()  - About 0.5 sec per cpu, which is unacceptable 
> with the arch supported 4k cpus.
> To my limited understanding, on the plat-eznps arch, where each cpu is always 
> running a single threaded process in 
> isolation mode, the above call is not necessary,
> Can you please confirm (or reject) my understanding? If I'm wrong short 
> explanation will be appreciated.
> If I'm correct, I will be grateful if you can point me to how to skip this 
> call in a way acceptable by community.

You've failed to explain why you think hotplug should be a performance
critical path.

I'm also not seeing how it would be different from boot; you'd be
looking at a similar cost for SMP bringup.

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