linux-kernel - Re: [PATCH v8 1/7] x86, memhp, numa: Online memory-less nodes at boot time.

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Date:	Tue, 19 Jul 2016 14:50:17 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Dou Liyang <douly.fnst@...fujitsu.com>
Cc:	cl@...ux.com, mika.j.penttila@...il.com, mingo@...hat.com,
	akpm@...ux-foundation.org, rjw@...ysocki.net, hpa@...or.com,
	yasu.isimatu@...il.com, isimatu.yasuaki@...fujitsu.com,
	kamezawa.hiroyu@...fujitsu.com, izumi.taku@...fujitsu.com,
	gongzhaogang@...pur.com, len.brown@...el.com, lenb@...nel.org,
	tglx@...utronix.de, chen.tang@...ystack.cn, rafael@...nel.org,
	x86@...nel.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Tang Chen <tangchen@...fujitsu.com>,
	Zhu Guihua <zhugh.fnst@...fujitsu.com>
Subject: Re: [PATCH v8 1/7] x86, memhp, numa: Online memory-less nodes at
 boot time.

Hello,

On Tue, Jul 19, 2016 at 03:28:02PM +0800, Dou Liyang wrote:
> In this series of patches, we are going to construct cpu <-> node mapping
> for all possible cpus at boot time, which is a 1-1 mapping. It means the

1-1 mapping means that each cpu is mapped to its own private node
which isn't the case.  Just call it a persistent mapping?

> cpu will be mapped to the node it belongs to, and will never be changed.
> If a node has only cpus but no memory, the cpus on it will be mapped to
> a memory-less node. And the memory-less node should be onlined.
> 
> This patch allocate pgdats for all memory-less nodes and online them at
> boot time. Then build zonelists for these nodes. As a result, when cpus
> on these memory-less nodes try to allocate memory from local node, it
> will automatically fall back to the proper zones in the zonelists.

Yeah, I think this is an a lot better approach for memory-less nodes.

> Signed-off-by: Zhu Guihua <zhugh.fnst@...fujitsu.com>
> Signed-off-by: Dou Liyang <douly.fnst@...fujitsu.com>

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun