linux-kernel - Re: [PATCH v2 1/5] mm: add numa node symlink for memory section in sysfs

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Message-ID: <alpine.DEB.2.00.0910280159380.7122@chino.kir.corp.google.com>
Date:	Wed, 28 Oct 2009 02:03:41 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
cc:	Alex Chiang <achiang@...com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Gary Hade <garyhade@...ibm.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Badari Pulavarty <pbadari@...ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH v2 1/5] mm: add numa node symlink for memory section in
 sysfs

On Wed, 28 Oct 2009, Heiko Carstens wrote:

> The short answer is: s390 doesn't support NUMA, because the hardware doesn't
> tell us to which node (book in s390 terms) a memory range belongs to.
> 
> Memory layout for a logical partition is striped: first x mbyte belong to
> node 0, next x mbyte belong to node 1, etc...
> 
> Also, since there is always a hypervisor running below Linux I don't think
> it would make too much sense if we would know to which node a piece of
> memory belongs to: if the hypervisor decides to schedule a virtual cpu of
> a logical partition to a different node then what?
> 

Ok, so the patchset is a no-op for s390 since it only utilizes the 
!CONFIG_NUMA code.

Alex, I think the safest thing to do in unregister_mem_sect_under_nodes() 
is to iterate though the section pfns and remove links to the node_device 
kobjs for all the distinct pfn_to_nid()'s that it encounters.
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