RE: [EXT] Re: [PATCH 2/2] block: remove the per-bio/request write hint.

Avi Shchislowski
2022-03-14T07:43:12Z

> >
> > Hi Jens,
> >
> > The "upstream first" policy applies to the Android kernel (see also
> > https://arstechnica.com/gadgets/2021/09/android-to-take-an-upstream-
> first-development-model-for-the-linux-kernel/).
> > If anyone requests inclusion in the Android kernel tree of a patch
> > that is not upstream, that request is rejected unless a very strong
> > reason can be provided why it should be included in the Android kernel
> > only instead of being sent upstream. It is not clear to me why the
> > patch Bean mentioned is not upstream nor in the upstream Android
> > kernel tree.
> >
> > From a UFS vendor I received the feedback that the F2FS write hint
> > information helps to reduce write amplification significantly. If the
> > write hint information is retained in the upstream kernel I can help
> > with making sure that the UFS patch mentioned above is integrated in
> > the upstream Linux kernel.
>
> I'm really not that interested at this point, and I don't want to gate removal or
> inclusion of code on some potential future event that may never happen.
>
> That doesn't mean that the work and process can't continue on the Android
> front, the only difference is what the baseline kernel looks like for the
> submitted patchset.
>
> Hence I do think we should go ahead as planned, and then we'll just revisit
> the topic if/when some actual code comes up.
>
We also supports Samsung & Micron approach and sorry to see that this functionality
has been removed.

Cheers,
Avi
> --
> Jens Axboe
>