Re: [RFC PATCH 1/5] slub: Introduce on_partial()

[Matthew Wilcox]

On Tue, Oct 17, 2023 at 03:44:35PM +0000, chengming.zhou@xxxxxxxxx wrote:
> We change slab->__unused to slab->flags to use it as SLUB_FLAGS, which
> now only include SF_NODE_PARTIAL flag. It indicates whether or not the
> slab is on node partial list.

This is an unnecessarily complex solution.  As with the pfmemalloc bit,
we can reuse the folio flags for a few flags.  I would recommend the
PG_workingset bit for this purpose.