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

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Date:   Mon, 20 Mar 2023 05:55:03 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Jaegeuk Kim <jaegeuk@...nel.org>
Cc:     Christoph Hellwig <hch@...radead.org>,
        linux-kernel@...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>,
        Avri Altman <avri.altman@....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 Mon, Feb 27, 2023 at 03:15:51PM -0800, Jaegeuk Kim wrote:
> 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

The group ID isn't even ever set, how can it be useful to you?