[PATCH v6 3/7] drm/sched: add device name to the drm_sched_process_job event

[Philipp Stanner]

On Thu, 2024-11-14 at 11:01 +0100, Pierre-Eric Pelloux-Prayer wrote:
> Until the switch from kthread to workqueue,

Could you include the commit ID here where that happened? 

"Since switching the scheduler from using kthreads to workqueues in
commit 1234 ("foo: bar") userspace applications cannot determine the
[...] anymore"


>  a userspace application could
> determine the source device

source device of *what*? Should be mentioned.

>  from the pid of the thread sending the event.

nit: s/pid/PID ?

> 
> With workqueues this is not possible anymore, so the event needs to
> contain
> the dev_name() to identify the device.
> 
> Signed-off-by: Pierre-Eric Pelloux-Prayer
> <pierre-eric.pelloux-prayer at amd.com>
> ---
>  drivers/gpu/drm/scheduler/gpu_scheduler_trace.h | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/scheduler/gpu_scheduler_trace.h
> b/drivers/gpu/drm/scheduler/gpu_scheduler_trace.h
> index c75302ca3427..c4ec28540656 100644
> --- a/drivers/gpu/drm/scheduler/gpu_scheduler_trace.h
> +++ b/drivers/gpu/drm/scheduler/gpu_scheduler_trace.h
> @@ -42,6 +42,7 @@ DECLARE_EVENT_CLASS(drm_sched_job,
>  			     __field(uint64_t, id)
>  			     __field(u32, job_count)
>  			     __field(int, hw_job_count)
> +			     __string(dev, dev_name(sched_job-
> >sched->dev))
>  			     ),
>  
>  	    TP_fast_assign(
> @@ -52,9 +53,10 @@ DECLARE_EVENT_CLASS(drm_sched_job,
>  			   __entry->job_count =
> spsc_queue_count(&entity->job_queue);
>  			   __entry->hw_job_count = atomic_read(
>  				   &sched_job->sched->credit_count);
> +			   __assign_str(dev);
>  			   ),
> -	    TP_printk("entity=%p, id=%llu, fence=%p, ring=%s, job
> count:%u, hw job count:%d",
> -		      __entry->entity, __entry->id,
> +	    TP_printk("dev=%s, entity=%p, id=%llu, fence=%p,
> ring=%s, job count:%u, hw job count:%d",
> +		      __get_str(dev), __entry->entity, __entry->id,
>  		      __entry->fence, __get_str(name),
>  		      __entry->job_count, __entry->hw_job_count)
>  );