Re: [PATCH v7 0/3] FDP and per-io hints

Keith Busch
2024-10-03T21:48:52Z

On Thu, Oct 03, 2024 at 02:55:16PM +0200, Christoph Hellwig wrote:
> On Wed, Oct 02, 2024 at 11:34:47AM -0700, Bart Van Assche wrote:
> > Isn't FDP about communicating much more than only this information to
> > the block device, e.g. information about reclaim units? Although I'm
> > personally not interested in FDP, my colleagues were involved in the
> > standardization of FDP.
>
> Yes, it is. And when I explained how to properly export this kind of
> information can be implemented on top of the version Kanchan sent everyone
> suddenly stopped diskussion technical points and went either silent or
> all political.

The nominals can mean whatever you want. If you want it to mean
"temperature", then that's what it means. If you want it to mean
something else, then don't use this.

These are hints at the end of the day. Nothing locks the kernel into
this if a better solution develops. As you know, it was ripped out
before.

> So I think some peoples bonuses depend on not understanding the problem
> I fear :(

The only "bonus" I have is not repeatedly explaining why people can't
use h/w features the way they want.