Messages in this thread | | | Date | Mon, 7 Aug 2017 10:33:54 +0200 | From | Peter Zijlstra <> | Subject | Re: hotplug support for arch/arc/plat-eznps platform |
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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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