Re: [RFC PATCH v3 04/10] PM / EM: Expose the Energy Model in sysfs

[Peter Zijlstra]

On Mon, May 21, 2018 at 03:24:59PM +0100, Quentin Perret wrote:
> This exposes the Energy Model (read-only) of all frequency domains in
> sysfs for convenience. To do so, a parent kobject is added to the CPU
> subsystem under the umbrella of which a kobject for each frequency
> domain is attached.
> 
> The resulting hierarchy is as follows for a platform with two frequency
> domains for example:
> 
>    /sys/devices/system/cpu/energy_model
>    âââ fd0
>    â âââ capacity
>    â âââ cpus
>    â âââ frequency
>    â âââ power
>    âââ fd4
>        âââ capacity
>        âââ cpus
>        âââ frequency
>        âââ power
> 

Given that each FD can have multiple {freq,power} tuples and sysfs has a
one value per file policy, how does this work?