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

[Christoph Hellwig]

On Tue, Jan 16, 2024 at 12:19:39PM -0800, Yosry Ahmed wrote:
> Well, better compression ratios for one :)
> 
> I think a long time ago there were complaints that zsmalloc had higher
> latency than zbud/z3fold, but since then a lot of things have changed
> (including nice compaction optimization from Sergey, and compaction
> was one of the main factors AFAICT). Also, recent experiments that
> Chris Li conducted showed that (at least in our setup), the
> decompression is only a small part of the fault latency with zswap
> (i.e. not the main factor) -- so I am not sure if it actually matters
> in practice.
> 
> That said, I have not conducted any experiments personally with z3fold
> or zbud, which is why I proposed the conservative approach of marking
> as deprecated first. However, if others believe this is unnecessary I
> am fine with removal as well. Whatever we agree on is fine by me.

In general deprecated is for code that has active (intentional) users
and/or would break setups.  I does sound to me like that is not the
case here, but others might understand this better.