linux-kernel - Re: [PATCH v2] printk: Add boottime and real timestamps

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Message-ID: <alpine.DEB.2.20.1708012112520.2682@nanos>
Date:   Tue, 1 Aug 2017 21:13:18 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Prarit Bhargava <prarit@...hat.com>
cc:     John Stultz <john.stultz@...aro.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Mark Salyzyn <salyzyn@...roid.com>,
        Jonathan Corbet <corbet@....net>,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        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 v2] printk: Add boottime and real timestamps

On Tue, 1 Aug 2017, Prarit Bhargava wrote:
> On 08/01/2017 01:00 PM, John Stultz wrote:
> > Its been asked already, but I've not yet seen an answer.
> 
> Sorry for missing this.
> 
> > Is there a reason your not also adding PRINTK_TIME_BOOT here (which to
> > me would be more generally useful then REAL or MONO)?
> 
> REAL has been useful to me in debug cases where events on the system were timed
> to the wall clock (ex cron job running at 3AM).  I hadn't really thought much
> about using BOOT TBH because MONO seemed to work just fine.
> 
> Mark Salyzyn, did you want BOOT or MONO?

We really want both.

Thanks,

	tglx