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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <Y/05p0jYrg2wfXw6@google.com>
Date:   Mon, 27 Feb 2023 15:15:51 -0800
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     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 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.