[Intel-gfx] [PATCH] drm/i915: add a tracepoint for gpu frequency changes

[Arjan van de Ven]

On 9/1/2012 11:26 AM, Ben Widawsky wrote:
> On 2012-08-30 04:26, Daniel Vetter wrote:
>> We've had and still have too many issues where the gpu turbot doesn't
>> quite to what it's supposed to do (or what we want it to do).
>>
>> Adding a tracepoint to track when the desired gpu frequence changes
>> should help a lot in characterizing and understanding problematic
>> workloads.
>>
>> Also, this should be fairly interesting for power tuning (and
>> especially noticing when the gpu is stuck in high frequencies, as has
>> happened in the past) and hence for integration into powertop and
>> similar tools.
>>
>> Cc: Arjan van de Ven <arjan at linux.intel.com>
>> Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> 
> I can't help but think it's equally interesting to know when the queue the work as well.
> 
> 

btw... if the userspace interface (e.g. the actual event) is not controversial and very unlikely to change,
I'd like to start coding the powertop support for this already....