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SubjectRe: [PATCH v3] docs/mm: Physical Memory: add example of interleaving nodes
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On Mon, Feb 13, 2023 at 05:44:47PM +0200, Mike Rapoport wrote:
> From: "Mike Rapoport (IBM)" <rppt@kernel.org>
>
> 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>
> ---
>
> v3:
> * Fix typos and wording (Matthew)
>
> v2: https://lore.kernel.org/all/20230212095445.1311627-1-rppt@kernel.org
> * Wording update (Bagas)
> * Add forgotten Suggested-by
>
> v1: https://lore.kernel.org/all/20230211102207.1267058-1-rppt@kernel.org
> Documentation/mm/physical_memory.rst | 19 +++++++++++++++++++
> 1 file changed, 19 insertions(+)
>
> diff --git a/Documentation/mm/physical_memory.rst b/Documentation/mm/physical_memory.rst
> index 3f3c02aa6e6e..863ddcd0b291 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
>
> base-commit: e076f253283c3e55a128fa9665c0e6cd8146948d
> --
> 2.35.1
>

--
Sincerely yours,
Mike.

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