linux-kernel - Re: [PATCH] ufs: core: ufshcd: use CLOCK

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Date:   Mon, 1 Aug 2022 11:23:42 +0800
From:   Stanley Chu <chu.stanley@...il.com>
To:     Daniil Lunev <dlunev@...omium.org>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Bart Van Assche <bvanassche@....org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Bean Huo <beanhuo@...ron.com>,
        Daejun Park <daejun7.park@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: [PATCH] ufs: core: ufshcd: use CLOCK_BOOTTIME for debugging timestamps

Hi Daniil,

On Wed, Jul 20, 2022 at 6:49 PM Daniil Lunev <dlunev@...omium.org> wrote:
>
> CLOCK_MONOTONIC is not advanced when the system is in suspend. This
> becomes problematic when debugging issues related to suspend-resume:
> the timestamps printed by ufshcd_print_trs can not be correlated with
> dmesg entries, which are timestamped with CLOCK_BOOTTIME.
>
> This CL changes the used clock to CLOCK_BOOTTIME for the informational
> timestamp variables and adds mirroring CLOCK_BOOTIME instances for
> variables used in subsequent derevations (to not change the semantics of
> those derevations).
>
> Signed-off-by: Daniil Lunev <dlunev@...omium.org>
>

Regarding the suspend/resume issue breakdown with aligned timestamp
with the dmesg logs, perhaps we need to use "sched_clock()" since it
is the timestamp used by dmesg?

Thanks,
Stanley