linux-kernel - Re: [PATCH v2 0/5] Add movablecore

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Message-ID: <50B7E594.8090106@zytor.com>
Date:	Thu, 29 Nov 2012 14:45:40 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Luck, Tony" <tony.luck@...el.com>
CC:	Mel Gorman <mgorman@...e.de>, Jiang Liu <jiang.liu@...wei.com>,
	Tang Chen <tangchen@...fujitsu.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"rob@...dley.net" <rob@...dley.net>,
	"isimatu.yasuaki@...fujitsu.com" <isimatu.yasuaki@...fujitsu.com>,
	"laijs@...fujitsu.com" <laijs@...fujitsu.com>,
	"wency@...fujitsu.com" <wency@...fujitsu.com>,
	"linfeng@...fujitsu.com" <linfeng@...fujitsu.com>,
	"yinghai@...nel.org" <yinghai@...nel.org>,
	"kosaki.motohiro@...fujitsu.com" <kosaki.motohiro@...fujitsu.com>,
	"minchan.kim@...il.com" <minchan.kim@...il.com>,
	"rientjes@...gle.com" <rientjes@...gle.com>,
	"rusty@...tcorp.com.au" <rusty@...tcorp.com.au>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Len Brown <lenb@...nel.org>,
	"Wang, Frank" <frank.wang@...el.com>
Subject: Re: [PATCH v2 0/5] Add movablecore_map boot option

On 11/29/2012 02:41 PM, Luck, Tony wrote:
>> The other bit is that if you really really want high reliability, memory
>> mirroring is the way to go; it is the only way you will be able to
>> hotremove memory without having to have a pre-event to migrate the
>> memory away from the affected node before the memory is offlined.
> 
> Some platforms don't support cross-node mirrors ... but we still want to
> be able to remove a node.
> 

Yes, well, those platforms don't support that degree of "really really
high reliability", since the unannounced failure of the node controller
will bring down the system.

	-hpa


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