On Fri, Jan 12, 2024 at 11:42 AM Nhat Pham [off-list ref] wrote:

On Fri, Jan 12, 2024 at 11:31 AM Yosry Ahmed [off-list ref] wrote:

quoted

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.