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.2.00.0910271422090.22335@chino.kir.corp.google.com>
Date:	Tue, 27 Oct 2009 14:27:56 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Alex Chiang <achiang@...com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Gary Hade <garyhade@...ibm.com>,
	Heiko Carstens <heiko.carstens@...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 Tue, 27 Oct 2009, Alex Chiang wrote:

> Thank you for ACKing, David.
> 
> S390 guys, I cc'ed you on this patch because I heard a rumour
> that your memory sections may belong to more than one NUMA node?
> Is that true? If so, how would you like me to handle that
> situation?
> 

You're referring to how unregister_mem_sect_under_nodes() should be 
handled, right?  register_mem_sect_under_node() already looks supported by 
your patch.

Since the unregister function includes a plural "nodes," I assume that 
it's possible for hotplug to register a memory section to more than one 
node.  That's probably lacking on x86 currently, however, because we lack 
node hotplug.

I'd suggest a similiar iteration through pfn's that the register function 
does checking for multiple nodes and then removing the link from all 
applicable node_devices kobj when unregistering.

Maybe one of the s390 maintainers will test that?
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