[Skiboot] [PATCH] numa/associativity: Add a new level of NUMA for GPU's

Stewart Smith stewart at linux.vnet.ibm.com
Thu Jul 13 15:42:24 AEST 2017

Balbir Singh <bsingharora at gmail.com> writes:
> Today we have an issue where the NUMA nodes corresponding
> to GPU's have the same affinity/distance as normal memory
> nodes. Our reference-points today supports two levels
> [0x4, 0x4] for normal systems and [0x4, 0x3] for Power8E
> systems. This patch adds a new level [0x4, X, 0x2] and
> uses node-id as at all levels for the GPU.
> Cc: Reza Arbab <arbab at linux.vnet.ibm.com>
> Cc: Alistair Popple <alistair at popple.id.au>
> Cc: Benjamin Herrenschmidt <benh at kernel.crashing.org>
> Signed-off-by: Balbir Singh <bsingharora at gmail.com>
> ---
> Tested on a system, ensured existing nodes have a node
> distances are not impacted. GPU nodes have a distance
> of 80 w.r.t all other nodes. No changes are needed in
> the Linux kernel.

Thanks! Merged to master as of f845a648b8cb0435aa6323f58fac50792bbe1163

Stewart Smith
OPAL Architect, IBM.

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