Re: [tip: sched/core] sched: Fix performance regression introduced by mm_cid

Sebastian Andrzej Siewior
2023-06-23T06:37:38Z

On 2023-06-21 16:59:31 [-0700], John Johansen wrote:
> > Which turned a per-cpu cache into a global memory pool protected by a spinlock. It may benefit RT, but it does not appear to be so great at scaling.
> >
> it is not. And I have a patch that needs some more formal testing for some stats.
> Ubuntu pulled it in last cycle so it has gotten a fair bit of use and is looking good
> on that end. There are probably some tweaks that can be done to improve it. The
> backoff in particular is something that has mostly been adjusted in response to some
> basic benchmarking.
>
> anyways patch below
>
> commit e057e9b47f1749882ea0efb4427d6b9671c761ab

I think I've been looking at this patch, or a former version of it, and
it looked good.

Sebastian