Module backend 

The vendor backend abstraction — nvtop’s struct gpu_vendor vtable, translated to Rust.

Contract:

• init() failing is normal (driver/library absent) — the registry drops the backend silently and the rest of the tool keeps working.
• Per-metric absence is None in the sample, never an Err. Err from a refresh means “this refresh produced nothing usable” (device fell off the bus, etc.) and is survivable.

Enums

BackendError

Traits

GpuBackend

Functions

all_backends

Explicit registry — no constructor/inventory magic. Each backend’s failed init is logged and skipped.