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docs/mm: Physical Memory: add example of interleaving nodes

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Add an example of memory layout with interleaving nodes where even memory
banks belong to node 0 and odd memory banks belong to node 1

Suggested-by: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/r/20230213154447.1631847-1-rppt@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Mike Rapoport (IBM) 2023-02-13 17:44:47 +02:00 committed by Jonathan Corbet
parent 33fcc0e3c5
commit 10d1813513
1 changed files with 19 additions and 0 deletions
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19
Documentation/mm/physical_memory.rst
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@ -114,6 +114,25 @@ RAM equally split between two nodes, there will be ``ZONE_DMA32``,
| DMA32 | NORMAL | MOVABLE | | NORMAL | MOVABLE |
+---------+----------+-----------+ +------------+-------------+
Memory banks may belong to interleaving nodes. In the example below an x86
machine has 16 Gbytes of RAM in 4 memory banks, even banks belong to node 0
and odd banks belong to node 1::
0 4G 8G 12G 16G
+-------------+ +-------------+ +-------------+ +-------------+
| node 0 | | node 1 | | node 0 | | node 1 |
+-------------+ +-------------+ +-------------+ +-------------+
0 16M 4G
+-----+-------+ +-------------+ +-------------+ +-------------+
| DMA | DMA32 | | NORMAL | | NORMAL | | NORMAL |
+-----+-------+ +-------------+ +-------------+ +-------------+
In this case node 0 will span from 0 to 12 Gbytes and node 1 will span from
4 to 16 Gbytes.
.. _nodes:
Nodes