2018-04-26 19:50:57

by Johannes Thumshirn

Subject: [PATCH] nvme: change order of qid and cmdid in completion trace

Keith reported that command submission and command completion
tracepoints have the order of the cmdid and qid fileds swapped.

While it isn't easily possible to change the command submission
tracepoint, as there is a regression test parsing it in blktests we
can swap the command completion tracepoint to have the fileds aligned.

Signed-off-by: Johannes Thumshirn <[email protected]>
Reported-by: Keith Busch <[email protected]>
---
drivers/nvme/host/trace.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/host/trace.h b/drivers/nvme/host/trace.h
index ea91fccd1bc0..01390f0e1671 100644
--- a/drivers/nvme/host/trace.h
+++ b/drivers/nvme/host/trace.h
@@ -148,8 +148,8 @@ TRACE_EVENT(nvme_complete_rq,
__entry->flags = nvme_req(req)->flags;
__entry->status = nvme_req(req)->status;
),
- TP_printk("cmdid=%u, qid=%d, res=%llu, retries=%u, flags=0x%x, status=%u",
- __entry->cid, __entry->qid, __entry->result,
+ TP_printk("qid=%d, cmdid=%u, res=%llu, retries=%u, flags=0x%x, status=%u",
+ __entry->qid, __entry->cid, __entry->result,
__entry->retries, __entry->flags, __entry->status)

);
--
2.16.3

2018-04-26 20:05:16

by Jens Axboe

Subject: Re: [PATCH] nvme: change order of qid and cmdid in completion trace

On 4/26/18 1:49 PM, Johannes Thumshirn wrote:
> Keith reported that command submission and command completion
> tracepoints have the order of the cmdid and qid fileds swapped.
>
> While it isn't easily possible to change the command submission
> tracepoint, as there is a regression test parsing it in blktests we
> can swap the command completion tracepoint to have the fileds aligned.

It also makes more sense to have qid before cmdid.

Also, fileds -> fields, in two spots.

With that:

Reviewed-by: Jens Axboe <[email protected]>

--
Jens Axboe

2018-04-26 20:23:10

by Johannes Thumshirn

Subject: Re: [PATCH] nvme: change order of qid and cmdid in completion trace

On Thu, Apr 26, 2018 at 02:01:59PM -0600, Jens Axboe wrote:
> On 4/26/18 1:49 PM, Johannes Thumshirn wrote:
> > Keith reported that command submission and command completion
> > tracepoints have the order of the cmdid and qid fileds swapped.
> >
> > While it isn't easily possible to change the command submission
> > tracepoint, as there is a regression test parsing it in blktests we
> > can swap the command completion tracepoint to have the fileds aligned.
>
> It also makes more sense to have qid before cmdid.
>
> Also, fileds -> fields, in two spots.

Args. Thanks

--
Johannes Thumshirn Storage
[email protected] +49 911 74053 689
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