Re: [PATCH RFC] mm: ghost swapfile support for zswap

[Rik van Riel]

On Fri, 2025-11-21 at 17:52 -0800, Chris Li wrote:
> On Fri, Nov 21, 2025 at 3:40 AM Johannes Weiner <hannes@xxxxxxxxxxx>
> wrote:
> > 
> > 
> > Zswap is primarily a compressed cache for real swap on secondary
> > storage. It's indeed quite important that entries currently in
> > zswap
> > don't occupy disk slots; but for a solution to this to be
> > acceptable,
> > it has to work with the primary usecase and support disk writeback.
> 
> Well, my plan is to support the writeback via swap.tiers.
> 
How would you do writeback from a zswap entry in
a ghost swapfile, to a real disk swap backend?

That is the use case people are trying to solve.

How would your architecture address it?

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