Re: [RFC PATCH v3 0/7] slub: Delay freezing of CPU partial slabs

[Christoph Lameter]

On Sat, 28 Oct 2023, Chengming Zhou wrote:

> 2. But for full slab (slab->freelist == NULL), PG_workingset is not much useful, we don't
>   safely know whether it's used as the cpu slab or not just from this flag. So __slab_free()
>   still rely on the "frozen" bit to know it.
>
> 3. And the maintaining of "frozen" has no extra cost now, since it's changed together with "freelist"
>   and other counter using cmpxchg, we already have the cmpxchg when start to use a slab as the cpu slab.
>
> Maybe I missed something, I don't know how to drop the frozen flag.


Maybe frozen is now = PG_Workingset | cmpxchg-frozen?