linux-kernel - Re: [PATCH] mm: add node physical memory range to sysfs

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Date:	Thu, 13 Dec 2012 10:17:49 -0500
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
CC:	Davidlohr Bueso <davidlohr.bueso@...com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	kosaki.motohiro@...il.com
Subject: Re: [PATCH] mm: add node physical memory range to sysfs

(12/12/12 11:49 PM), Dave Hansen wrote:
> On 12/12/2012 06:03 PM, Davidlohr Bueso wrote:
>> On Wed, 2012-12-12 at 17:48 -0800, Dave Hansen wrote:
>>> But if we went and did it per-DIMM (showing which physical addresses and
>>> NUMA nodes a DIMM maps to), wouldn't that be redundant with this
>>> proposed interface?
>>
>> If DIMMs overlap between nodes, then we wouldn't have an exact range for
>> a node in question. Having both approaches would complement each other.
> 
> How is that possible?  If NUMA nodes are defined by distances from CPUs
> to memory, how could a DIMM have more than a single distance to any
> given CPU?

numa_emulation? just guess.



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