Re: [PATCH v4] arch_topology: Trace the update thermal pressure

[Greg KH]

On Wed, Apr 27, 2022 at 09:08:06AM +0100, Lukasz Luba wrote:
> Add trace event to capture the moment of the call for updating the thermal
> pressure value. It's helpful to investigate how often those events occur
> in a system dealing with throttling. This trace event is needed since the
> old 'cdev_update' might not be used by some drivers.
> 
> The old 'cdev_update' trace event only provides a cooling state
> value: [0, n]. That state value then needs additional tools to translate
> it: state -> freq -> capacity -> thermal pressure. This new trace event
> just stores proper thermal pressure value in the trace buffer, no need
> for additional logic. This is helpful for cooperation when someone can
> simply sends to the list the trace buffer output from the platform (no
> need from additional information from other subsystems).
> 
> There are also platforms which due to some design reasons don't use
> cooling devices and thus don't trigger old 'cdev_update' trace event.
> They are also important and measuring latency for the thermal signal
> raising/decaying characteristics is in scope. This new trace event
> would cover them as well.
> 
> We already have a trace point 'pelt_thermal_tp' which after a change to
> trace event can be paired with this new 'thermal_pressure_update' and
> derive more insight what is going on in the system under thermal pressure
> (and why).
> 
> Signed-off-by: Lukasz Luba <lukasz.luba@xxxxxxx>

Much better, thanks.  I'll wait for Sudeep's comments/review before
taking it into my tree.

greg k-h