[PATCH v8 15/16] Documentation: remove the constraint on the distances of node pairs
From: Zhen Lei <hidden>
Date: 2016-09-01 06:57:15
Also in:
linux-devicetree, linux-mm, lkml
Subsystem:
open firmware and flattened device tree bindings, the rest · Maintainers:
Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
At present, the distances must equal in both direction for each node pairs. For example: the distance of node B->A must the same to A->B. But we really don't have to do this. Signed-off-by: Zhen Lei <redacted> --- Documentation/devicetree/bindings/numa.txt | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/Documentation/devicetree/bindings/numa.txt b/Documentation/devicetree/bindings/numa.txt
index 21b3505..f7234cd 100644
--- a/Documentation/devicetree/bindings/numa.txt
+++ b/Documentation/devicetree/bindings/numa.txt@@ -48,15 +48,19 @@ distance (memory latency) between all numa nodes. Note: 1. Each entry represents distance from first node to second node. - The distances are equal in either direction. 2. The distance from a node to self (local distance) is represented with value 10 and all internode distance should be represented with a value greater than 10. - 3. distance-matrix should have entries in lexicographical ascending + 3. For non-local node pairs: + 1) If both direction specified, keep no change. + 2) If only one direction specified, assign it to the other direction. + 3) If none of the two direction specified, both are assigned to + REMOTE_DISTANCE. + 4. distance-matrix should have entries in lexicographical ascending order of nodes. - 4. There must be only one device node distance-map which must + 5. There must be only one device node distance-map which must reside in the root node. - 5. If the distance-map node is not present, a default + 6. If the distance-map node is not present, a default distance-matrix is used. Example: --
2.5.0