Since the events may be processed out of order (due to per-cpu
ringbuffers) we need to be careful to associated wait pairs in order to
compute the correct elapsed time.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Effectively you choose to redirect the output of an event instead of
mmapping it directly - but the target must already be mmapped.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
We can now record when a pageflip occurs by listening for the flip
tracepoint. Merely proof of principle at this point.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
