Re: [PATCH v4 2/2] trace nvme submit queue status

peng yu
2018-12-19T01:19:15Z

On Tue, Dec 18, 2018 at 9:47 AM hch@lst.de <hch@lst.de> wrote:
> diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
> index 2477bd906904..5a0bf6a24d50 100644
> --- a/drivers/nvme/host/pci.c
> +++ b/drivers/nvme/host/pci.c
> @@ -1004,8 +1004,7 @@ static inline void nvme_handle_cqe(struct nvme_queue *nvmeq, u16 idx)
> }
>
> req = blk_mq_tag_to_rq(*nvmeq->tags, cqe->command_id);
> - trace_nvme_sq(req->rq_disk, nvmeq->qid, le16_to_cpu(cqe->sq_head),
> - nvmeq->sq_tail);
> + trace_nvme_sq(req, cqe->sq_head, nvmeq->sq_tail);
> nvme_end_request(req, cqe->status, cqe->result);
> }
>
> diff --git a/drivers/nvme/host/trace.h b/drivers/nvme/host/trace.h
> index cf666709bc50..3564120aa7b3 100644
> --- a/drivers/nvme/host/trace.h
> +++ b/drivers/nvme/host/trace.h
> @@ -185,22 +185,24 @@ TRACE_EVENT(nvme_async_event,
> #undef aer_name
>
> TRACE_EVENT(nvme_sq,
> - TP_PROTO(void *rq_disk, int qid, int sq_head, int sq_tail),
> - TP_ARGS(rq_disk, qid, sq_head, sq_tail),
> + TP_PROTO(struct request *req, __le16 sq_head, int sq_tail),
> + TP_ARGS(req, sq_head, sq_tail),
> TP_STRUCT__entry(
> + __field(int, ctrl_id)
> __array(char, disk, DISK_NAME_LEN)
> __field(int, qid)
> - __field(int, sq_head)
> - __field(int, sq_tail)
> + __field(u16, sq_head)
> + __field(u16, sq_tail)
> ),
> TP_fast_assign(
> - __assign_disk_name(__entry->disk, rq_disk);
> - __entry->qid = qid;
> - __entry->sq_head = sq_head;
> + __entry->ctrl_id = nvme_req(req)->ctrl->instance;
> + __assign_disk_name(__entry->disk, req->rq_disk);
> + __entry->qid = nvme_req_qid(req);
> + __entry->sq_head = le16_to_cpu(sq_head);
> __entry->sq_tail = sq_tail;
> ),
> - TP_printk("nvme: %s qid=%d head=%d tail=%d",
> - __print_disk_name(__entry->disk),
> + TP_printk("nvme%d: %sqid=%d, head=%u, tail=%u",
> + __entry->ctrl_id, __print_disk_name(__entry->disk),
> __entry->qid, __entry->sq_head, __entry->sq_tail
> )
> );

I think this change is nice. Will you submit this change or are you
suggesting me to do it?