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

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Message-ID: <c25e48f5-ace4-5d2c-8174-11ac63316323@grimberg.me>
Date:   Thu, 28 Jun 2018 17:34:07 +0300
From:   Sagi Grimberg <sagi@...mberg.me>
To:     Keith Busch <keith.busch@...ux.intel.com>
Cc:     Keith Busch <keith.busch@...el.com>,
        Christoph Hellwig <hch@....de>,
        Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>,
        Linux NVMe Mailinglist <linux-nvme@...ts.infradead.org>,
        Johannes Thumshirn <jthumshirn@...e.de>
Subject: Re: [PATCH] nvme: trace: add disk name to tracepoints


> Thinking more on this, not using the hw qid really limits the utility
> out of using these trace events: We may not be able to match a completion
> to the submission without it since cmdid alone isn't enough to match up
> the two events.
> 
> Here's an updated proposal and actually tested. I was also able to
> combine admin and io submissions.

This looks good!

One thing that is missing is the controller id when we have multiple
controllers/subsystems in the host like:

TP_printk("nvme%d: qid=%d, nsid=%u, cmdid=%u, flags=0x%x, meta=0x%llx, 
cmd=(%s %s)",

But Johannes can add it I guess.