linux-kernel - Re: [PATCH] scsi: ufs: support IO traces for zoned block device

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Message-ID: <ZBhX3YfHGtY8kom8@infradead.org>
Date:   Mon, 20 Mar 2023 05:55:57 -0700
From:   "hch@...radead.org" <hch@...radead.org>
To:     Avri Altman <Avri.Altman@....com>
Cc:     Jaegeuk Kim <jaegeuk@...nel.org>,
        "hch@...radead.org" <hch@...radead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Bart Van Assche <bvanassche@....org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Bean Huo <beanhuo@...ron.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Can Guo <cang@...eaurora.org>
Subject: Re: [PATCH] scsi: ufs: support IO traces for zoned block device

On Tue, Feb 28, 2023 at 07:28:35AM +0000, Avri Altman wrote:
> > doorbell status along with the attached scsi command, in addition to the
> > accurate latency measurements.
> For us as well.
> Moreover, we are mainly using upiu tracing which is not available at scsi ML.

So let's rework the tracepoints to work at the UPIU level and stop the
gracious poking into SCSI CDBs.