[RFC PATCHv3 2/6] nvme-multipath: add support for adaptive I/O policy

[Christoph Hellwig]

On Mon, Oct 27, 2025 at 02:59:36PM +0530, Nilay Shroff wrote:
> This commit introduces a new I/O policy named "adaptive". Users can
> configure it by writing "adaptive" to "/sys/class/nvme-subsystem/nvme-
> subsystemX/iopolicy"
> 
> The adaptive policy dynamically distributes I/O based on measured
> completion latency. The main idea is to calculate latency for each path,
> derive a weight, and then proportionally forward I/O according to those
> weights.

This really sounds like a lot of overhead, and really smells of all
that horrible old-school FC SAN thinking we've been carefully trying
to avoid in nvme.

What's the point here?