[Bug 110848] Everything using GPU gets stuck after running+killing parallel Media loads (after running 3D benchmarks)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110848

--- Comment #37 from Chris Wilson <chris at chris-wilson.co.uk> ---
Have you heard the tale of the pagefault of doom?

It's not a story any developer would tell you...

Under exactly the wrong conditions, eviction of entire surfaces (up to the
GGTT) can occur between every singe byte read and written via the mmap. We are
not meant to be that stupid any more (although it comes close), and instead of
evicting the entire GGTT it may just be ending up in a ping-pong of the
memcpy(dst, src). For moderately sized buffers (say a few 10s of MB) you are
not likely to see that complete within a year.

I hope we haven't regressed to that level of stupidity, but I wouldn't put it
past me.

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