Re: [PATCH v6 4/6] zsmalloc: Add a LRU to zs_pool to keep track of zspages in LRU order

[Johannes Weiner]

On Fri, Nov 18, 2022 at 04:15:34PM -0800, Nhat Pham wrote:
> This helps determines the coldest zspages as candidates for writeback.
> 
> Signed-off-by: Nhat Pham <nphamcs@xxxxxxxxx>

Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>

This looks good to me. The ifdefs are higher than usual, but in this
case they actually really nicely annotate exactly which hunks need to
move to zswap (as CONFIG_ZPOOL == CONFIG_ZSWAP) when we unify the LRU!
zbud and z3fold don't have those helpful annotations (since they're
zswap-only to begin with), which will make their conversion a bit more
laborious. But zsmalloc can be a (rough) guiding template for them.

Thanks