Re: [PATCH] x86/resctrl: mba_MBps: Fall back to total b/w if local b/w unavailable

[Peter Newman]

Hi Tony,

On Tue, Oct 24, 2023 at 8:16 PM Tony Luck <tony.luck@xxxxxxxxx> wrote:
> --- a/arch/x86/kernel/cpu/resctrl/monitor.c
> +++ b/arch/x86/kernel/cpu/resctrl/monitor.c
> @@ -418,6 +418,14 @@ static int __mon_event_count(u32 rmid, struct rmid_read *rr)
>         return 0;
>  }
>
> +static struct mbm_state *get_mbm_data(struct rdt_domain *dom_mbm, int rmid)
> +{
> +       if (is_mbm_local_enabled())
> +               return &dom_mbm->mbm_local[rmid];
> +
> +       return &dom_mbm->mbm_total[rmid];
> +}

That looks very similar to the get_mbm_state() function I added to
this same file recently:

https://lore.kernel.org/all/20221220164132.443083-2-peternewman%40google.com

I think the name you picked is misleadingly general. "local if
available, otherwise total" seems to be a choice specific to the mbps
controller. I think these functions should be reconciled a little
better.

Other than that, looks good.

Reviewed-by: Peter Newman <peternewman@xxxxxxxxxx>