linux-kernel - Re: [PATCH 2/2 v7] printk: Add monotonic, boottime, and realtime timestamps

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Message-ID: <20170822142322.GD30286@pathway.suse.cz>
Date:   Tue, 22 Aug 2017 16:23:22 +0200
From:   Petr Mladek <pmladek@...e.com>
To:     Prarit Bhargava <prarit@...hat.com>
Cc:     Mark Salyzyn <salyzyn@...roid.com>, linux-kernel@...r.kernel.org,
        Jonathan Corbet <corbet@....net>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Christoffer Dall <cdall@...aro.org>,
        Deepa Dinamani <deepa.kernel@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        Joel Fernandes <joelaf@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Nicholas Piggin <npiggin@...il.com>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Olof Johansson <olof@...om.net>,
        Josh Poimboeuf <jpoimboe@...hat.com>, linux-doc@...r.kernel.org
Subject: Re: [PATCH 2/2 v7] printk: Add monotonic, boottime, and realtime
 timestamps

On Tue 2017-08-22 10:09:40, Prarit Bhargava wrote:
> 
> 
> On 08/17/2017 11:30 AM, Mark Salyzyn wrote:
> > On 08/17/2017 06:15 AM, Prarit Bhargava wrote:
> >> printk.time=1/CONFIG_PRINTK_TIME=1 adds a unmodified local hardware clock
> >> timestamp to printk messages.  The local hardware clock loses time each
> >> day making it difficult to determine exactly when an issue has occurred in
> >> the kernel log, and making it difficult to determine how kernel and
> >> hardware issues relate to each other in real time.
> > Congrats, greatly eases merges into older kernels, and has eliminated the churn
> > this could place on all the configured systems out there.
> > 
> > Sadly, one of my suggestions did not quite go the way I expected ;-} easy to
> > correct, and fix (I missed a spot in my original suggestion, as code changed
> > underfoot over the set ;-/). (see bottom)
> 
> Added.  I will send out v8 shortly.

It might make sense to wait a bit. I am in the middle of v7 review and
have several comments.

I would suggest to slow down this a bit anyway. You sent 7 versions
within three weeks. It improved nicely over time. But I think that
I am not the only one who has troubles to follow.

Best Regards,
Petr