Groups > linux.kernel > #1191216

Re: [PATCH 0/5] Make cpuid <-> nodeid mapping persistent.

From	Tejun Heo <tj@kernel.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH 0/5] Make cpuid <-> nodeid mapping persistent.
Date	2015-07-23 20:40 +0200
Message-ID	<pPtzs-6sr-25@gated-at.bofh.it> (permalink)
References	<pJxw5-3UB-5@gated-at.bofh.it> <pMDbY-4gz-11@gated-at.bofh.it> <pPgCe-4F9-7@gated-at.bofh.it>
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Hello, Tang.

On Thu, Jul 23, 2015 at 12:44:53PM +0800, Tang Chen wrote:
> Allocating cpuid when a new cpu comes up and reusing the cpuid when it
> comes up again is possible. But I'm not quite sure if it will be less
> modification
> because we still need an array or bit map or something to keep the mapping,
> and select backup nodes for cpus on memory-less nodes when allocating
> memory.
> 
> I can post a set of patches for this idea. And then we can see which one is
> better.

I suspect the difference could be that in the current code the users
(workqueue) can remain the same while if we do it lazily there
probably needs to be a way to poke it.  As long as the IDs are
allocated to the online CPUs first, I think pre-allocating everything
should be fine too.

Thanks.

-- 
tejun
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Re: [PATCH 0/5] Make cpuid <-> nodeid mapping persistent. Tang Chen <tangchen@cn.fujitsu.com> - 2015-07-23 06:50 +0200
  Re: [PATCH 0/5] Make cpuid <-> nodeid mapping persistent. Tejun Heo <tj@kernel.org> - 2015-07-23 20:40 +0200

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