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

[Ben Widawsky]

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.


-- 
Ben Widawsky, Intel Open Source Technology Center