Re: [PATCH RFC] ipc/mqueue: introduce msg cache

[Shakeel Butt]

+Vlastimil

On Tue, Dec 20, 2022 at 10:48 AM Roman Gushchin
<roman.gushchin@xxxxxxxxx> wrote:
>
> Sven Luther reported a regression in the posix message queues
> performance caused by switching to the per-object tracking of
> slab objects introduced by patch series ending with the
> commit 10befea91b61 ("mm: memcg/slab: use a single set of kmem_caches for all
> allocations").
>
> To mitigate the regression cache allocated mqueue messages on a small
> percpu cache instead of releasing and re-allocating them every time.
>

Seems fine with me but I am wondering what is stopping us to do this
caching in the slab layer for all accounted allocations? Does this
only make sense for specific scenarios/use-cases?