linux-kernel - Re: [PATCH 2/2 v8] printk: Add monotonic, boottime, and realtime timestamps

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Date:   Fri, 25 Aug 2017 13:52:54 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Prarit Bhargava <prarit@...hat.com>
Cc:     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>,
        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 v8] printk: Add monotonic, boottime, and realtime
 timestamps

On (08/24/17 09:42), Prarit Bhargava wrote:
[..]
> +config PRINTK_TIME_DEBUG
> +	bool "Allow runtime reselection of any timebase on printks"
> +	depends on PRINTK
> +	default N
> +	help
> +	  Selecting this option causes time stamps of the printk()
> +	  messages to be changed freely at runtime on the output of
> +	  the syslog() system call and at the console. Without this
> +	  option, one can only enable or disable the configuration
> +	  selected timebase.
> +
> +	  Runtime adjustment can be set via
> +	  /sys/module/printk/paramters/time as follows with a string:

			s/paramters/parameters/

> +	  0/N/n/disable, 1/Y/y/local, b/boot, m/monotonic, r/realtime.
> +	  eg: echo local >/sys/module/printk/parameters/time
> +	      echo realtime >/sys/module/printk/parameters/time

	-ss