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

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Date:	Tue, 15 Apr 2008 14:19:20 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Johannes Weiner" <hannes@...urebad.de>, suresh.b.siddha@...el.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

On Tue, Apr 15, 2008 at 2:14 PM, Johannes Weiner <hannes@...urebad.de> wrote:
> 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?

Not sure, on x86_64 one node should have one bdata only.
execpt suresh update that to make one node have two bdata.

YH
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