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

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Date:	Mon, 28 Jan 2013 17:45:37 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Tang Chen <tangchen@...fujitsu.com>,
	"H. Peter Anvin" <hpa@...or.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	"jiang.liu@...wei.com" <jiang.liu@...wei.com>,
	"wujianguo@...wei.com" <wujianguo@...wei.com>,
	"wency@...fujitsu.com" <wency@...fujitsu.com>,
	"laijs@...fujitsu.com" <laijs@...fujitsu.com>,
	"linfeng@...fujitsu.com" <linfeng@...fujitsu.com>,
	"yinghai@...nel.org" <yinghai@...nel.org>,
	"isimatu.yasuaki@...fujitsu.com" <isimatu.yasuaki@...fujitsu.com>,
	"rob@...dley.net" <rob@...dley.net>,
	"kosaki.motohiro@...fujitsu.com" <kosaki.motohiro@...fujitsu.com>,
	"minchan.kim@...il.com" <minchan.kim@...il.com>,
	"mgorman@...e.de" <mgorman@...e.de>,
	"rientjes@...gle.com" <rientjes@...gle.com>,
	"guz.fnst@...fujitsu.com" <guz.fnst@...fujitsu.com>,
	"rusty@...tcorp.com.au" <rusty@...tcorp.com.au>,
	"lliubbo@...il.com" <lliubbo@...il.com>,
	"jaegeuk.hanse@...il.com" <jaegeuk.hanse@...il.com>,
	"glommer@...allels.com" <glommer@...allels.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: RE: [PATCH 3/3] acpi, memory-hotplug: Support getting hotplug info
 from SRAT.

> I will post a patch to fix it. How about always keep node0 unhotpluggable ?

Node 0 (or more specifically the node that contains memory <4GB) will be
full of BIOS reserved holes in the memory map. It probably isn't removable
even if Linux thinks it is.  Someday we might have a smart BIOS that can
relocate itself to another node - but for now making node0 unhotpluggable
looks to be a plausible interim move.

Ultimately we'd like to be able to remove any node (just not all of them at
the same time ... just like we can now offline any cpu - but not all of them
together).

-Tony
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