Re: [RFC PATCH v3 7/8] mm/zswap: compressed ram direct integration

[Gregory Price]

On Thu, Jan 15, 2026 at 05:00:04PM +0000, Yosry Ahmed wrote:
> > 
> > 2. Just enable zswap shrinker and have memory reclaim move these pages
> > into disk swap. This will have a much more drastic performance
> > implications though :)
> 
> I think what you're getting it as that we can still make forward
> progress after memory lands in compressed cxl. But moving memory to
> compressed cxl is already forward progress that reclaim won't capture if
> we charge memory as a full page. I think this is the crux of the issue.
> 
> We need to figure out how to make accounting work such that moving
> memory to compressed cxl is forward progress, but make sure we don't
> break the overall accounting consisteny. If we only charge the actual
> compressed size, then from the system perspective there is a page that
> is only partially charged and the rest of it is more-or-less leaked.

Which is comically fine - because the actual capacity of the node is
functionally a lie anyway :D

~Gregory