Quoting Chris Wilson (2019-10-10 14:48:49)
> Check the user's flags on the struct file before deciding whether or not
> to stall before submitting a request. This allows us to reasonably
> cheaply honour O_NONBLOCK without checking at more critical phases
> during request submission.

One might reasonably expect poll(POLLOUT) to be supported as well in
this case :|

Bring on ugpu.
-Chris
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