[PATCH 3/3] tree: add attribute numa_nodes for NVMe path object

[Daniel Wagner]

On Sat, Apr 05, 2025 at 06:32:49PM +0530, Nilay Shroff wrote:
> Add a new attribute named "numa_nodes" under the NVMe path object. This
> attribute is used by the iopolicy "numa". The numa_nodes value is stored
> for each NVMe path and represents the NUMA node(s) associated with it.
> When the iopolicy is set to "numa", I/O traffic originating from a given
> NUMA node will be forwarded through the corresponding NVMe path.
> 
> The numa_nodes attribute is useful for observing which NVMe path the
> kernel would choose for I/O forwarding based on NUMA affinity. To support
> this, export the attribute in libnvme.map so it can be accessed via
> nvme-cli.

This one has the same limitation as the previous one. Given that libnvme
currently caches everything, we could just accept this limitation for
the time being. Any thoughts on this?