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

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Message-ID: <20091028171558.GB22743@ldl.fc.hp.com>
Date:	Wed, 28 Oct 2009 11:15:58 -0600
From:	Alex Chiang <achiang@...com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Heiko Carstens <heiko.carstens@...ibm.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

* David Rientjes <rientjes@...gle.com>:
> 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.

Sounds good.

> 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.

Ok, I will respin.

Thanks!
/ac
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