[Intel-gfx] [PATCH igt v2] tests: Add a random load generator

[Chris Wilson]

Quoting Arkadiusz Hiler (2018-02-28 12:11:41)
> On Mon, Jan 22, 2018 at 11:14:01AM +0200, Chris Wilson wrote:
> > Apply a random load to one or all engines in order to apply stress to
> > RPS as it tries to constantly adjust the GPU frequency to meet the
> > changing workload.
> 
> Doing some IGT archeology here.
> 
> Seems like both 'all' and 'pulse' subtests cause nasty incompletes.
> https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_809/shards-all.html#igt@gem_exec_load@all

Not nasty, just a failure in the test runner. They are intentionally
long running tests as the problem may take days to manifest.
-Chris