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| author | Mike Rapoport (IBM) <rppt@kernel.org> | 2023-02-13 17:44:47 +0200 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2023-03-14 12:56:30 -0600 |
| commit | 10d18135135c6b203feb5978d17bc4f53d1ddf43 (patch) | |
| tree | db4fd3ef41bd6bb29adf7b7fd9e25077d3ed76cb /Documentation/mm | |
| parent | 33fcc0e3c599199e342a3e68ad719a9c03dbceb0 (diff) | |
| download | linux-10d18135135c6b203feb5978d17bc4f53d1ddf43.tar.gz | |
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.rst | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/Documentation/mm/physical_memory.rst b/Documentation/mm/physical_memory.rst index 1bc888d36ea134..d4b7830f0ebc7c 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 |