Re: + bootmem-node-setup-agnostic-free_bootmem.patch added to -mm tree

[Johannes Weiner <hannes@saeurebad.de>]

Hi,

"Yinghai Lu" <yhlu.kernel@gmail.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@intel.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