linux-kernel - Re: [PATCH] nvme: trace: add disk name to tracepoints

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Message-ID: <20180626150106.GB6628@localhost.localdomain>
Date:   Tue, 26 Jun 2018 09:01:06 -0600
From:   Keith Busch <keith.busch@...ux.intel.com>
To:     Johannes Thumshirn <jthumshirn@...e.de>
Cc:     Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>,
        Keith Busch <keith.busch@...el.com>,
        Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>,
        Linux NVMe Mailinglist <linux-nvme@...ts.infradead.org>
Subject: Re: [PATCH] nvme: trace: add disk name to tracepoints

On Tue, Jun 26, 2018 at 03:51:41PM +0200, Johannes Thumshirn wrote:
> @@ -655,9 +655,9 @@ blk_status_t nvme_setup_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
>  	cmd->common.command_id = req->tag;
>  	nvme_req(req)->ctrl = ctrl;
>  	if (ns)
> -		trace_nvme_setup_nvm_cmd(req->q->id, cmd);
> +		trace_nvme_setup_nvm_cmd(req, cmd, ns->disk->disk_name);

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.