Date: Wed, 10 May 2006 23:06:06 -0700
From: Andrew Morton <akpm@osdl.org>
To: Shaohua Li <shaohua.li@intel.com>
Cc: linux-kernel@vger.kernel.org, zwane@linuxpower.ca, vatsa@in.ibm.com,
       ashok.raj@intel.com
Subject: Re: [PATCH 0/10] bulk cpu removal support
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Shaohua Li <shaohua.li@intel.com> 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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