[RFC PATCH] mm: z3fold: rename CONFIG_Z3FOLD to CONFIG_Z3FOLD_DEPRECATED

[Yosry Ahmed]

On Fri, Jan 12, 2024 at 11:42 AM Nhat Pham <nphamcs at gmail.com> wrote:
>
> On Fri, Jan 12, 2024 at 11:31 AM Yosry Ahmed <yosryahmed at google.com> wrote:
> >
> > The z3fold compressed pages allocator is not widely used, most users use
> > zsmalloc. The only disadvantage of zsmalloc in comparison is the
> > dependency on MMU, and zbud is a more common option for !MMU as it was
> > the default zswap allocator for a long time.
>
> Johannes and I were chatting about this the other day. We might be
> able to disable certain zsmalloc behavior in the case of !MMU, making
> it available there too. Once that's happened, we can outright remove
> z3fold and zbud, and have one allocator to rule them all? :)

(Adding Sergey and Minchan for visibility)

I didn't want to bring up the zsmalloc MMU dependency in this thread
to reduce noise, but that's also what I had in mind. Sergey and I were
also chatting about this the other day :)

I thought deprecating z3fold is the low hanging fruit. Then, once we
can sort out the MMU dependency in zsmalloc, we can go after zbud as
well.