Re: [RFC PATCH] zsmalloc: make common caches global

[Nhat Pham]

On Thu, Jan 15, 2026 at 8:49 PM Sergey Senozhatsky
<senozhatsky@xxxxxxxxxxxx> wrote:
>
> Currently, zsmalloc creates kmem_cache of handles and zspages
> for each pool, which may be suboptimal from the memory usage
> point of view (extra internal fragmentation per pool).  Systems
> that create multiple zsmalloc pools may benefit from shared
> common zsmalloc caches.
>
> Make handles and zspages kmem caches global.

Hmm yeah this sounds reasonable to me. No reason to have dedicated
kmem_cache per zs_pool (in the case of zswap, I suppose it's one for
each compression algorithm, which is usually just one - but still...).

Is there any lock contention implications?

>