[PATCHv3 0/9] libnvme: add support for retrieving additional NVMe stat

[Daniel Wagner]

On Tue, Apr 21, 2026 at 08:20:21PM +0530, Nilay Shroff wrote:
> Certain NVMe attributes and statistics can change dynamically at runtime.
> However, the current libnvme implementation caches attribute values while
> scanning and building the topology. Subsequent libnvme API calls return
> these cached values.
> 
> While this approach works well for one-shot nvme-cli commands, it is not
> suitable for use cases that require upto date information. In particular,
> real-time monitoring tools such as nvme-top require access to the latest
> (non-cached) values of such attributes.
> 
> To address this, this patchset introduces support for retrieving
> non-cached values for selected attributes whose values may change
> dynamically. The first three patches disable auto-generated accessors
> for ana_state, numa_nodes, and iopolicy using "!accessors:none", and
> provide custom implementations that always return the latest values.
> 
> In addition, libnvme lacks support for retrieving gendisk statistics, which
> provide useful insight into disk activity (e.g., number of I/Os processed,
> time spent servicing I/O, and in-flight I/O counts). This patchset adds
> support for retrieving gendisk I/O statistics for both per-path and namespace
> gendisks.
> 
> Finally, this series adds support for retrieving diagnostic counters at 
> different levels, including per-path, namespace, nshead, and controller.
> These counters should improve visibility into NVMe native multipath behavior.
> 
> All of the above statistics and counters can be leveraged by tools such as
> nvme-top to provide real-time monitoring and analysis.
> 
> As usual, feedback and suggestions are welcome!

I went ahead and applied them. I did some cosmetic formatting changes
for the accessors generator comment and added the manually written
getters to the python binding define table.

This should unblock your work on 'nvme monitor'

Thanks,
Daniel