sna: Upload to large pixmaps inplace

When the pixmap is large, larger than L2 cache size, we are unlikely to
benefit from first copying the data to a shadow buffer -- as that shadow
buffer itself will mostly reside in main memory. In such circumstances
we may as perform the write to the GTT mapping of the GPU bo. As such,
it is a fragile heuristic that may require further tuning.

Avoiding that extra copy gives a 30% boost to putimage500/shmput500 at
~10% cost to putimage10/shmput10 on Atom (945gm/PineView), without any
noticeable impact upon cairo.

Reported-by: Michael Larabel <Michael@phoronix.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

0 files changed, 0 insertions, 0 deletions