re: kern/57816: Add sysctl support for physical cores

[matthew green <mrg%eterna23.net@localhost>]

>  > It also has serious downsides:
>  >  - it requires the user to be root
>  >  - it requires one "cpuctl identify N" process for each cpu
>  
>  That's one of the design flaws of cpuctl. All data should be
>  collected and provided by the kernel, including the information
>  that cannot be collected from MSRs. That should make 'identify'
>  a wrapper around sysctl.

i wouldn't call it a design flaw of cpuctl, but of the x86
backend for it :-)

the arm and arm64 versions work via sysctl, and i think most
of the sparc and sparc64 ones too.

it wouldn't be bad to expose a lot of the basic things (eg,
numa/package/core/smt IDs, maybe some more like base speed)
in a MI tree like kern.cpu, most of the current ones are in
machdep trees of course.


.mrg.