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

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Date:   Tue, 28 Feb 2023 07:28:35 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Jaegeuk Kim <jaegeuk@...nel.org>,
        "hch@...radead.org" <hch@...radead.org>
CC:     "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 02/15, Christoph Hellwig wrote:
> > Why does UFS even have it's own common tracing instad of just relying
> > on the core SCSI one, and even worse pokes into command set specifics
> > which is a no-go for LLDDs.  This code simply needs to go away instead
> > of beeing "enhanced".
> 
> I'm not sure how all the other vendors use the trace tho, at least to me, it's
> quite useful when debugging any UFS-specific information such as group_id and
> 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.

Thanks,
Avri