op 23-07-14 11:36, Christian K?nig schreef: > Am 23.07.2014 11:30, schrieb Daniel Vetter: >> On Wed, Jul 23, 2014 at 11:27 AM, Christian K?nig >> <christian.koenig at amd.com> wrote: >>> You submit a job to the hardware and then block the job to wait for radeon >>> to be finished? Well than this would indeed require a hardware reset, but >>> wouldn't that make the whole problem even worse? >>> >>> I mean currently we block one userspace process to wait for other hardware >>> to be finished with a buffer, but what you are describing here blocks the >>> whole hardware to wait for other hardware which in the end blocks all >>> userspace process accessing the hardware. >> There is nothing new here with prime - if one context hangs the gpu it >> blocks everyone else on i915. >> >>> Talking about alternative approaches wouldn't it be simpler to just offload >>> the waiting to a different kernel or userspace thread? >> Well this is exactly what we'll do once we have the scheduler. But >> this is an orthogonal issue imo. > > Mhm, could have the scheduler first? > > Cause that sounds like reducing the necessary fence interface to just a > fence->wait function. You would also lose benefits like having a 'perf timechart' for gpu's.
~Maarten
