Thinking more on this, not using the hw qid really limits the utility
out of using these trace events: We may not be able to match a completion
to the submission without it since cmdid alone isn't enough to match up
the two events.
Here's an updated proposal and actually tested. I was also able to
combine admin and io submissions.
This looks good!
One thing that is missing is the controller id when we have multiple
controllers/subsystems in the host like:
TP_printk("nvme%d: qid=%d, nsid=%u, cmdid=%u, flags=0x%x, meta=0x%llx,
cmd=(%s %s)",
But Johannes can add it I guess.
