linux-kernel - Re: [PATCH 4/4] scsi: add more contexts in the ufs tracepoints

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Message-ID: <8170ddc084fc40a57c51501cbc29f5ea@codeaurora.org>
Date:   Tue, 20 Oct 2020 19:57:26 +0800
From:   Can Guo <cang@...eaurora.org>
To:     Avri Altman <Avri.Altman@....com>
Cc:     Jaegeuk Kim <jaegeuk@...nel.org>, linux-kernel@...r.kernel.org,
        linux-scsi@...r.kernel.org, kernel-team@...roid.com,
        Jaegeuk Kim <jaegeuk@...gle.com>,
        Alim Akhtar <alim.akhtar@...sung.com>
Subject: Re: [PATCH 4/4] scsi: add more contexts in the ufs tracepoints

On 2020-10-20 19:02, Can Guo wrote:
> On 2020-10-20 18:51, Avri Altman wrote:
>>> 
>>> On 2020-10-06 06:36, Jaegeuk Kim wrote:
>>> > From: Jaegeuk Kim <jaegeuk@...gle.com>
>>> >
>>> > This adds user-friendly tracepoints with group id.
>> You have the entire cdb as part of the upiu trace,
>> Can't you parse what you need from there?
>> 
>> Thanks,
>> Avri
> 
> Yes, but assume we have a large trace log file, having a
> groud id allows us to filter the data by it easily, right?
> 
> Thanks,
> 
> Can Guo.

I just dobule checked WRITE(10)'s CDB, byte 6 has group
ID ONLY. So Avri is right, we don't even need to parse it,
we can easily filter a ftrace log file by byte 6 to get the
WRITE(10) cmds with specific group ID - we don't need this
change.

Thanks,

Can Guo.