Re: [LSF/MM/BPF TOPIC] Swap Abstraction / Native Zswap

[Yosry Ahmed <yosryahmed@google.com>]

On Wed, Mar 1, 2023 at 2:45 AM Sergey Senozhatsky
<senozhatsky@chromium.org> wrote:
>
> On (23/02/28 00:12), Yosry Ahmed wrote:
> >
> > I assume by proper LRU handling you mean:
> > - Swap writeback LRU that lives outside of the zpool backends (i.e in
> > zswap itself or even outside zswap).
> > - Fix the case where we temporarily skip zswap and write directly to
> > the backing swapfile while zswap is full, until it performs some
> > writeback in the background.
> >
> > This work is orthogonal to that, but it is on the list of things that
> > we would like to do for zswap.
>
> Oh, sorry for the noise then. I somehow thought that one leads to
> another in some way, probably got that impression from offline
> discussions.
>
> > I guess you are mainly eager to move the writeback logic outside of
> > zsmalloc, or is there a different motivation? :)
>
> Not eager, but we've been promised that! :)

It still stands as the end goal for swap writeback LRUs :) As Minchan
said, the abstraction layer helps with a generic writeback LRU outside
of zswap.