Module device_policy 

Backend allowlists, env-driven defaults, and selection introspection.

Structs

DeviceCandidate

One row of backend introspection for UIs and logs.

DeviceFallbackError

Errors collected when every backend in the chain fails at run time.

DevicePolicy

Which backends a process may use — intersected with compile-time features and runtime availability.

Enums

DevicePickStrategy

How [GraphDevices::resolve_with_inputs] picks a backend when no hint is set.

Functions

device_chain_from_env

Ordered fallback chain from RLX_DEVICE_CHAIN (cuda,gpu,cpu).

device_chain_from_env_key

Read PREFIX_DEVICE_CHAIN.

device_from_env

Default device hint from RLX_DEVICE (or PREFIX_DEVICE via device_from_env_key).

device_from_env_key

Read PREFIX_DEVICE env var.

device_report

Explain which backends are viable for graph under policy.

devices_for_with_policy

Backends on this host that can lower graph, filtered by policy.

resolve_device

Resolve the backend to use: explicit hint → env → fastest for graph.

resolve_device_chain

First device in chain that is viable under policy for graph.

run_with_fallback

Try chain in order; return the first successful result from run.