[Intel-gfx] [PATCH] drm/i915: add turbo boost trace point

[Daniel Vetter]

On Wed, Nov 19, 2014 at 07:39:17AM -0800, Jesse Barnes wrote:
> On Wed, 19 Nov 2014 15:00:04 +0100
> Daniel Vetter <daniel at ffwll.ch> wrote:
> 
> > On Tue, Nov 18, 2014 at 01:12:29PM -0800, Jesse Barnes wrote:
> > > Might be helpful for debugging places where userspace ends up boosting
> > > or waiting where it doesn't intend to.
> > 
> > Might be feels a bit weak justification for a new tracepoint imo. Please
> > drum up more support.
> 
> I put it together for some media playback debugging we're doing on
> Chrome, where I suspect we're boosting when we don't want to (possibly
> due to userspace waits).

Hm, I've discussed this exact topic many moons ago with vpg folks and
they've said that the boosting done for media workloads on the idle->busy
transition annoys them. Iirc the plan we've hashed out was to add an
execbuf flag to prevent the execbuf boosting.

We've also discussed the wait boosting but that's imo just a bug in libva
;-) And for debugging pointless waits we already have good tracepoints
imo.

Unfortunately nothing ever came out of that discussion :(
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch