linux-kernel - Re: + bootmem-node-setup-agnostic-free

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Message-ID: <87ej96hlc1.fsf@saeurebad.de>
Date:	Tue, 15 Apr 2008 23:14:38 +0200
From:	Johannes Weiner <hannes@...urebad.de>
To:	"Yinghai Lu" <yhlu.kernel@...il.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>, akpm@...ux-foundation.org,
	mm-commits@...r.kernel.org, ak@...e.de, clameter@....com,
	kamezawa.hiroyu@...fujitsu.com, y-goto@...fujitsu.com,
	linux-kernel@...r.kernel.org
Subject: Re: + bootmem-node-setup-agnostic-free_bootmem.patch added to -mm tree

Hi,

"Yinghai Lu" <yhlu.kernel@...il.com> writes:

>>  > 2. intel cross node box: node0: 0g-2g, 4g-6g, node1: 2g-4g, 6g-8g. i
>>  > don't think they have two bdata struct for every node.
>>
>>  How do the bdata structures represent this setup right now?  Are you
>>  sure that there is not a node descriptor for every contiguous region?
>
> http://lkml.org/lkml/2008/3/25/233
>
> Subject	[patch] srat, x86_64: Add support for nodes spanning other nodes
>
> For example, If the physical address layout on a two node system with 8 GB
> memory is something like:
> node 0: 0-2GB, 4-6GB
> node 1: 2-4GB, 6-8GB
>
> Current kernels fail to boot/detect this NUMA topology.
>
> ACPI SRAT tables can expose such a topology which needs to be supported.
>
> Signed-off-by: Suresh Siddha <suresh.b.siddha@...el.com>

As I understood the code (more guessing than understanding), it breaks
down these physical nodes into contiguous logical memory blocks which
then get represented by having a node descriptor for each of them.  Can
you confirm that?

	Hannes
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