Re: [PATCH 0/10] bulk cpu removal support

[Andrew Morton]

Shaohua Li <shaohua.li@xxxxxxxxx> wrote:
>
> CPU hotremove will migrate tasks and redirect interrupts off dead cpu.
> To remove multiple CPUs, we should iteratively do single cpu removal.
> If tasks and interrupts are migrated to a cpu which will be soon
> removed, then we will trash tasks and interrupts again. The following
> patches allow remove several cpus one time. It's fast and avoids
> unnecessary repeated trash tasks and interrupts. This will help NUMA
> style hardware removal and SMP suspend/resume. Comments and suggestions
> are appreciated.

This seems an awful lot of code for something which happens so infrequently.

How big is the problem you're fixing here, and what are the
user-observeable effects of these changes?
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