linux-kernel - [PATCH v2] nvme: change order of qid and cmdid in completion trace

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Date:   Thu, 26 Apr 2018 14:25:15 -0600
From:   Johannes Thumshirn <jthumshirn@...e.de>
To:     Keith Busch <keith.busch@...el.com>
Cc:     Linux NVMe Mailinglist <linux-nvme@...ts.infradead.org>,
        Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Johannes Thumshirn <jthumshirn@...e.de>
Subject: [PATCH v2] 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 fields 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 fields aligned.

Signed-off-by: Johannes Thumshirn <jthumshirn@...e.de>
Reported-by: Keith Busch <keith.busch@...el.com>
Reviewed-by: Jens Axboe <axboe@...nel.dk>

---
* Changes to v1:
- Changed two typos Jens spotted
- Add Jens' R-b
---
 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