RE: [PATCH v11 10/23] x86/resctrl: Remove MSR reading of event configuration value

[Luck, Tony]

> This new arch API has sharp corners because of asymmetry of where resctrl
> runs the arch function. I do not think it is required to change this since we
> can only speculate about how this may be used in the future but I do think
> it will be helpful to add comments that highlight:
>
> resctrl_arch_mon_event_config_get() ->  May run on CPU that does not belong to domain.
> resctrl_arch_mon_event_config_set() ->  Runs on CPU that belongs to domain.

Here's a vague data point about the future to help with speculation.

I have something coming along the pipeline that also can run on any CPU.

I am contemplating a flag in the rdt_resource structure (in appropriate substructure
resctrl_cache/resctrl_membw) to indicate "domain" vs. "any" for operations.

Would something like that be useful here?

-Tony