linux-kernel - Re: [PATCH 3/3] acpi, memory-hotplug: Support getting hotplug info from SRAT.

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Message-ID: <51033186.3000706@zytor.com>
Date:	Fri, 25 Jan 2013 17:29:42 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Tang Chen <tangchen@...fujitsu.com>, jiang.liu@...wei.com,
	wujianguo@...wei.com, wency@...fujitsu.com, laijs@...fujitsu.com,
	linfeng@...fujitsu.com, yinghai@...nel.org,
	isimatu.yasuaki@...fujitsu.com, rob@...dley.net,
	kosaki.motohiro@...fujitsu.com, minchan.kim@...il.com,
	mgorman@...e.de, rientjes@...gle.com, guz.fnst@...fujitsu.com,
	rusty@...tcorp.com.au, lliubbo@...il.com, jaegeuk.hanse@...il.com,
	tony.luck@...el.com, glommer@...allels.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 3/3] acpi, memory-hotplug: Support getting hotplug info
 from SRAT.

On 01/25/2013 05:12 PM, Andrew Morton wrote:
> On Fri, 25 Jan 2013 17:42:09 +0800
> Tang Chen <tangchen@...fujitsu.com> wrote:
> 
>> NOTE: Using this way will cause NUMA performance down because the whole node
>>       will be set as ZONE_MOVABLE, and kernel cannot use memory on it.
>>       If users don't want to lose NUMA performance, just don't use it.
> 
> I agree with this, but it means that nobody will test any of your new code.
> 
> To get improved testing coverage, can you think of any temporary
> testing-only patch which will cause testers to exercise the
> memory-hotplug changes?
> 

There is another problem: if ALL the nodes in the system support
hotpluggable memory, what happens?

	-hpa

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