RE: [PATCH] scsi: ufs: support IO traces for zoned block device

Avri Altman
2023-02-28T07:28:45Z

> On 02/15, Christoph Hellwig wrote:
> > Why does UFS even have it's own common tracing instad of just relying
> > on the core SCSI one, and even worse pokes into command set specifics
> > which is a no-go for LLDDs. This code simply needs to go away instead
> > of beeing "enhanced".
>
> I'm not sure how all the other vendors use the trace tho, at least to me, it's
> quite useful when debugging any UFS-specific information such as group_id and
> doorbell status along with the attached scsi command, in addition to the
> accurate latency measurements.
For us as well.
Moreover, we are mainly using upiu tracing which is not available at scsi ML.

Thanks,
Avri