Abdiel Janulgue authored Oct 11, 2016 and Chris Wilson committed Nov 29, 2016

A lot of igt testcases need some GPU workload to make sure a race
window is big enough. Unfortunately having a fixed amount of
workload leads to spurious test failures or overly long runtimes
on some fast/slow platforms. This library contains functionality
to submit GPU workloads that should consume exactly a specific
amount of time.

Since v14: Since we are using multiple signals, walk list of batches
to terminate a batch to avoid using a single global batch. Cycle signals
between SIGRTMIN and SIGRTMAX properly.

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: tomeu@tomeuvizoso.net
Reviewed-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Signed-off-by: Abdiel Janulgue <abdiel.janulgue@linux.intel.com>