Messages in this thread Patch in this message | | | Date | Wed, 27 Jun 2018 17:43:13 -0600 | From | Keith Busch <> | Subject | Re: [PATCH] nvme: trace: add disk name to tracepoints |
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On Wed, Jun 27, 2018 at 11:06:22AM +0300, Sagi Grimberg wrote: > > > > Not related to your patch, but I did notice that the req->q->id isn't > > > really useful here since that's not the hardware context identifier. > > > That's just some ida assigned software identifier. For the admin command > > > completion trace, it's actually a little confusing to see the qid in the > > > trace. > > > > It was actually requested by Martin so we can easily see which request > > got dispatched/completed on which request queue. > > Would be good in the future to display the hwqid, but we'll need to work > before we can do that.
I'd really like to see nvme qid, and it would allow for nice trace filters. We could use a little help from blk-mq to get the hctx's queue_num from a struct request. I think following should get us that (haven't tested just yet)
--- diff --git a/block/blk-mq.c b/block/blk-mq.c index b429d515b568..c6478833464d 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -466,6 +466,12 @@ struct request *blk_mq_alloc_request_hctx(struct request_queue *q, } EXPORT_SYMBOL_GPL(blk_mq_alloc_request_hctx); +unsigned int blk_mq_request_hctx_idx(struct request *rq) +{ + return blk_mq_map_queue(rq->q, rq->mq_ctx->cpu)->queue_num; +} +EXPORT_SYMBOL_GPL(blk_mq_request_hctx_idx); + static void __blk_mq_free_request(struct request *rq) { struct request_queue *q = rq->q; diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 46df030b2c3f..6a30c154aa99 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -653,7 +653,7 @@ blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req, cmd->common.command_id = req->tag; if (ns) - trace_nvme_setup_nvm_cmd(req->q->id, cmd); + trace_nvme_setup_nvm_cmd(req, cmd); else trace_nvme_setup_admin_cmd(cmd); return ret; diff --git a/drivers/nvme/host/trace.h b/drivers/nvme/host/trace.h index 01390f0e1671..95ebe803424b 100644 --- a/drivers/nvme/host/trace.h +++ b/drivers/nvme/host/trace.h @@ -79,6 +79,7 @@ TRACE_EVENT(nvme_setup_admin_cmd, TP_PROTO(struct nvme_command *cmd), TP_ARGS(cmd), TP_STRUCT__entry( + __field(int, qid) __field(u8, opcode) __field(u8, flags) __field(u16, cid) @@ -86,6 +87,7 @@ TRACE_EVENT(nvme_setup_admin_cmd, __array(u8, cdw10, 24) ), TP_fast_assign( + __entry->qid = 0; __entry->opcode = cmd->common.opcode; __entry->flags = cmd->common.flags; __entry->cid = cmd->common.command_id; @@ -93,16 +95,16 @@ TRACE_EVENT(nvme_setup_admin_cmd, memcpy(__entry->cdw10, cmd->common.cdw10, sizeof(__entry->cdw10)); ), - TP_printk(" cmdid=%u, flags=0x%x, meta=0x%llx, cmd=(%s %s)", - __entry->cid, __entry->flags, __entry->metadata, + TP_printk("qid=%d, cmdid=%u, flags=0x%x, meta=0x%llx, cmd=(%s %s)", + __entry->qid, __entry->cid, __entry->flags, __entry->metadata, show_admin_opcode_name(__entry->opcode), __parse_nvme_admin_cmd(__entry->opcode, __entry->cdw10)) ); TRACE_EVENT(nvme_setup_nvm_cmd, - TP_PROTO(int qid, struct nvme_command *cmd), - TP_ARGS(qid, cmd), + TP_PROTO(struct request *req, struct nvme_command *cmd), + TP_ARGS(req, cmd), TP_STRUCT__entry( __field(int, qid) __field(u8, opcode) @@ -113,7 +115,7 @@ TRACE_EVENT(nvme_setup_nvm_cmd, __array(u8, cdw10, 24) ), TP_fast_assign( - __entry->qid = qid; + __entry->qid = blk_mq_request_hctx_idx(req) + !!req->rq_disk; __entry->opcode = cmd->common.opcode; __entry->flags = cmd->common.flags; __entry->cid = cmd->common.command_id; @@ -141,7 +143,7 @@ TRACE_EVENT(nvme_complete_rq, __field(u16, status) ), TP_fast_assign( - __entry->qid = req->q->id; + __entry->qid = blk_mq_request_hctx_idx(req) + !!req->rq_disk; __entry->cid = req->tag; __entry->result = le64_to_cpu(nvme_req(req)->result.u64); __entry->retries = nvme_req(req)->retries; diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index e3147eb74222..af91b2d31a04 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -248,6 +248,7 @@ static inline u16 blk_mq_unique_tag_to_tag(u32 unique_tag) } +unsigned int blk_mq_request_hctx_idx(struct request *rq); int blk_mq_request_started(struct request *rq); void blk_mq_start_request(struct request *rq); void blk_mq_end_request(struct request *rq, blk_status_t error); --
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