On Wed, Sep 17, 2014 at 04:37:30PM +0100, Kumar Gala wrote:
>
> On Sep 17, 2014, at 1:56 AM, Ganapatrao Kulkarni <ganapatrao.kulkarni@xxxxxxxxxxxxxxxxxx> wrote:
>
> > From: Ganapatrao Kulkarni <ganapatrao.kulkarni@xxxxxxxxxx>
> >
> > This patch adds property "nid" to memory node to provide the memory range to
> > numa node id mapping.
> >
> > Signed-off-by: Ganapatrao Kulkarni <ganapatrao.kulkarni@xxxxxxxxxx>
> >
> > —
>
> Adding the PPC guys as they’ve been doing NUMA on IBM Power Servers
> for years with OF/DT. So we should really try and follow what they’ve
> done.
Agreed.
> > Documentation/devicetree/bindings/numa.txt | 58 ++++++++++++++++++++++++++++++
> > 1 file changed, 58 insertions(+)
> > create mode 100644 Documentation/devicetree/bindings/numa.txt
> >
> > diff --git a/Documentation/devicetree/bindings/numa.txt b/Documentation/devicetree/bindings/numa.txt
> > new file mode 100644
> > index 0000000..c4a94f2
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/numa.txt
> > @@ -0,0 +1,58 @@
> > +======================================================
> > +numa id binding description
> > +======================================================
> > +
> > +======================================================
> > +1 - Introduction
> > +======================================================
> > +The device node property "nid(numa node id)" can be added to memory
Why the quotes?
> > +device node to map the range of memory addresses as defined in property "reg".
> > +The property "nid" maps the memory range to the numa node id, which is used to
> > +find the local and remory pages on numa aware systems.
What is a "numa node id", exactly, and how is the OS intended to use it?
I don't see how this can be of any use as-is.
Mark.
> > +
> > +======================================================
> > +2 - nid property
> > +======================================================
> > +Numa node id, "nid" is required property of memory device node for
> > +numa enabled platforms.
> > +
> > +|------------------------------------------------------|
> > +|Property Type | Usage | Value Type | Definition |
> > +|------------------------------------------------------|
> > +| nid | R | <u32> | Numa Node id |
> > +| | | | for this memory |
> > +|------------------------------------------------------|
> > +
> > +========================================================
> > +4 - Example memory nodes with numa node id mapping
> > +========================================================
> > +
> > +Example 1 (2 memory nodes, each mapped to a numa node.):
> > +
> > + memory@00000000 {
> > + device_type = "memory";
> > + reg = <0x0 0x00000000 0x0 0x80000000>;
> > + nid = <0x0>;
> > + };
> > +
> > + memory@10000000000 {
> > + device_type = "memory";
> > + reg = <0x100 0x00000000 0x0 0x80000000>;
> > + nid = <0x1>;
> > + };
> > +
> > +Example 2 (multiple memory ranges in each memory node and mapped to numa node):
> > +
> > + memory@00000000 {
> > + device_type = "memory";
> > + reg = <0x0 0x00000000 0x0 0x80000000>,
> > + <0x0 0x80000000 0x0 0x80000000>;
> > + nid = <0x0>;
> > + };
> > +
> > + memory@10000000000 {
> > + device_type = "memory";
> > + reg = <0x100 0x00000000 0x0 0x80000000>,
> > + <0x100 0x80000000 0x0 0x80000000>;
> > + nid = <0x1>;
> > + };
> > --
> > 1.8.1.4
> >
>
> --
> Employee of Qualcomm Innovation Center, Inc.
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
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