linux-kernel - Re: [PATCH 2/2] x86, e820 disable ACPI Memory Hotplug if memory mapping is specified by user [v2]

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Message-ID: <1389663614.1792.267.camel@misato.fc.hp.com>
Date:	Mon, 13 Jan 2014 18:40:14 -0700
From:	Toshi Kani <toshi.kani@...com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Prarit Bhargava <prarit@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Bodo Eggert <7eggert@....de>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Len Brown <lenb@...nel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linn Crosetto <linn@...com>, Pekka Enberg <penberg@...nel.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tang Chen <tangchen@...fujitsu.com>,
	Wen Congyang <wency@...fujitsu.com>,
	Vivek Goyal <vgoyal@...hat.com>, dyoung@...hat.com,
	linux-acpi@...r.kernel.org,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH 2/2] x86, e820 disable ACPI Memory Hotplug if memory
 mapping is specified by user [v2]

On Mon, 2014-01-13 at 17:29 -0800, H. Peter Anvin wrote:
> On 01/13/2014 05:09 PM, Toshi Kani wrote:
> > 
> > In majority of the cases, memmap=exactmap is used for kdump and the
> > firmware info is sane.  So, I think we should keep NUMA enabled since it
> > could be useful when multiple CPUs are enabled for kdump.
> > 
> 
> Rather unlikely since all of the kdump memory is likely to sit in a
> single node.

Right, but CPUs are distributed into multiple nodes, which dump the 1st
kernel's memory.  So, these CPUs should dump their local memory ranges.

Thanks,
-Toshi

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