[Intel-gfx] uABI / Removing DRM_I915_LOW_LEVEL_TRACEPOINTS Kconfig

[Pierre-Loup A. Griffais]

On 12/18/18 3:33 AM, Chris Wilson wrote:
> Quoting Michael Sartain (2018-12-18 01:26:03)
>> I'm writing to try and make a case for Tvrtko's "Remove
>> DRM_I915_LOW_LEVEL_TRACEPOINTS Kconfig" patch:
>>
>>    https://lists.freedesktop.org/archives/intel-gfx/2018-June/169052.html
> 
> I'd recommend we just remove the tracepoints as in the very near future
> we will break them and the outlook seems bleak that we can support the
> same information in the future.

Is it due to moving to a more async (or HW-assisted) submission model? 
If so, I assume/hope there's still a way to reflect on when things 
completed after the fact? You could still emit tracepoints at the time 
when that becomes known, with the time delta marked in the tracepoint 
itself. gpuvis supports this, but the syntax it currently uses for it 
isn't necessarily important. There's not much value in looking at these 
tracepoints fly by in realtime, so being deferred a bit works well for 
all scenarios where examining a GPU scheduling trace is useful.

> -Chris
>