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

[Nathan Lynch]

Shaohua Li 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.

Some quantification of the benefits of adding this complexity would be
appreciated.  Like, how long does it take to offline all the cpus in a
node serially, and how much faster is the bulk method?
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