[Intel-gfx] [PATCH] drm/i915/selftests/blt: try to be more resilient against the GGTT

[Chris Wilson]

Quoting Matthew Auld (2019-11-05 11:21:15)
> For a tiny shared address space, where parts of it might already be
> reserved, we should expect to hit the occasional -ENOSPC.

Yeah, it's a bug though. It's on my todo list to demonstrate the bug
100% with just a bunch of parallel requests. A simple way to make
it more frequently affect live_blt is use to the same vm with multiple
contexts.

I'm ok with living with the sporadic fail as a reminder until reservation
is revamped.
-Chris