[Intel-gfx] [PATCH i-g-t v3 2/3] tests/gem_eio: Speed up test execution

[Chris Wilson]

Quoting Tvrtko Ursulin (2018-03-23 11:54:28)
> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> 
> If we stop relying on regular GPU hangs to be detected, but trigger them
> manually as soon as we know our batch of interest is actually executing
> on the GPU, we can dramatically speed up various subtests.
> 
> This is enabled by the pollable spin batch added in the previous patch.
> 
> v2:
>  * Test gem_wait after reset/wedge and with reset/wedge after a few
>    predefined intervals since gem_wait invocation. (Chris Wilson)
> 
> v3:
>  Chris Wilson:
>  * Decrease short test to 1us.
>  * Use POSIX timers instead of signals to avoid interrupting gem_wait.
>  * Improve comment.
> 
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> Suggested-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Antonio Argenziano <antonio.argenziano at intel.com>

I can't think of anything else that might go wrong, so
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris