summaryrefslogtreecommitdiff
path: root/Documentation/mm
diff options
context:
space:
mode:
authorMike Rapoport (IBM) <rppt@kernel.org>2023-02-13 17:44:47 +0200
committerJonathan Corbet <corbet@lwn.net>2023-03-14 12:56:30 -0600
commit10d18135135c6b203feb5978d17bc4f53d1ddf43 (patch)
treedb4fd3ef41bd6bb29adf7b7fd9e25077d3ed76cb /Documentation/mm
parent33fcc0e3c599199e342a3e68ad719a9c03dbceb0 (diff)
docs/mm: Physical Memory: add example of interleaving nodes
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>
Diffstat (limited to 'Documentation/mm')
-rw-r--r--Documentation/mm/physical_memory.rst19
1 files changed, 19 insertions, 0 deletions
diff --git a/Documentation/mm/physical_memory.rst b/Documentation/mm/physical_memory.rst
index 1bc888d36ea1..d4b7830f0ebc 100644
--- a/Documentation/mm/physical_memory.rst
+++ b/Documentation/mm/physical_memory.rst
@@ -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