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Date: Fri, 25 Aug 2017 13:52:54 +0900
From: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
To: Prarit Bhargava <prarit@redhat.com>
Cc: linux-kernel@vger.kernel.org, Mark Salyzyn <salyzyn@android.com>,
        Jonathan Corbet <corbet@lwn.net>, Petr Mladek <pmladek@suse.com>,
        Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        John Stultz <john.stultz@linaro.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Stephen Boyd <sboyd@codeaurora.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        Christoffer Dall <cdall@linaro.org>,
        Deepa Dinamani <deepa.kernel@gmail.com>,
        Ingo Molnar <mingo@kernel.org>, Joel Fernandes <joelaf@google.com>,
        Kees Cook <keescook@chromium.org>,
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        "Jason A. Donenfeld" <Jason@zx2c4.com>,
        Olof Johansson <olof@lixom.net>, Josh Poimboeuf <jpoimboe@redhat.com>,
        linux-doc@vger.kernel.org
Subject: Re: [PATCH 2/2 v8] printk: Add monotonic, boottime, and realtime
 timestamps
Message-ID: <20170825045254.GA5876@jagdpanzerIV.localdomain>
References: <1503582122-22841-1-git-send-email-prarit@redhat.com>
 <1503582122-22841-3-git-send-email-prarit@redhat.com>
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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