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

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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