[Intel-gfx] [PATCH 3/4] drm/i915: Allow userspace to hint that the relocations were known

[Chris Wilson]

On Sat, 10 Nov 2012 21:17:05 +0100, Daniel Vetter <daniel at ffwll.ch> wrote:
> Hm, I've thought we could get away for the gpu activity tracking by
> unconditionally assuming that any passed-in object is in is in all
> read domains. For cache flushing it doesn't matter what we set anyway
> since we invalidate/flush unconditionally all caches before/after each
> batch. And for activity tracking we unconditionally put all objects in
> a given execbuf to the front of the active list (with updated
> ring/seqno). The only important thing is to keep the write tracking to
> not break our various read/read optimizations.

One overlooked aspect is that the domain tracking helps with debugging
and identifying what the buffers are used for. It has paid dividends
many times when reading error-states, and certainly will prove to be
useful again in future.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre