[Intel-gfx] [PATCH i-g-t 2/3] tests/perf_pmu: Simplify interrupt testing

[Tvrtko Ursulin]

On 19/12/2017 21:45, Chris Wilson wrote:
> Quoting Tvrtko Ursulin (2017-12-19 15:45:42)
>> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
>>
>> Rather than calibrate and emit nop batches, use a manually signalled chain
>> of spinners to generate the desired interrupts.
>>
>> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
>> ---
>> -       /* Unplug the calibrated queue and wait for all the fences */
>> -       igt_spin_batch_free(gem_fd, spin);
>> -       igt_assert_eq(poll(&pfd, 1, 2 * test_duration_ms), 1);
>> -       close(pfd.fd);
>> +               pfd.fd = spin[i]->out_fence;
>> +               igt_spin_batch_set_timeout(spin[i], timeout_ms * 1e6);
>> +               igt_assert_eq(poll(&pfd, 1, 2 * timeout_ms), 1);
> 
> Oh, still with the synchronous behaviour, bleurgh.

I was attracted by the simplicity of this approach, but I can change to 
set incremental timeouts and keep the merged fence if you think that's 
better?

Regards,

Tvrtko