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From: Prarit Bhargava <prarit@redhat.com>
To: Petr Mladek <pmladek@suse.com>
Cc: linux-kernel@vger.kernel.org, Mark Salyzyn <salyzyn@android.com>,
	Jonathan Corbet <corbet@lwn.net>,
	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>,
	Peter Zijlstra <peterz@infradead.org>,
	Geert Uytterhoeven <geert+renesas@glider.be>,
	"Luis R. Rodriguez" <mcgrof@kernel.org>,
	Nicholas Piggin <npiggin@gmail.com>,
	"Jason A. Donenfeld" <Jason@zx2c4.com>,
	Olof Johansson <olof@lixom.net>,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	linux-doc@vger.kernel.org
Subject: Re: [PATCH 3/3 v11] printk: Add monotonic, boottime, and realtime timestamps
Date: Fri, 15 Sep 2017 10:40:11 -0400	[thread overview]
Message-ID: <4395c49b-5719-f6f8-6580-4c3f7abaed79@redhat.com> (raw)
In-Reply-To: <20170915132808.GL2908@pathway.suse.cz>



On 09/15/2017 09:28 AM, Petr Mladek wrote:
> 
> I am still slightly nervous that external tools would need updating.
> Also they might have troubles to interpret the time stamps especially
> when the source is changed at runtime via
> /sys/module/printk/parameters/time.

In earlier versions I had logic to prevent switching during runtime.  tglx
requested that it be removed and I removed it.  Personally I fall into the "I'm
going to set it once and never change it" however, as Mark will offer there are
cases where it might be advantageous to change the timestamp.  I think he has a
patch that will append a b/r/etc. to the timestamp so that userspace can
interpret the different timestamps.

P.

      parent reply	other threads:[~2017-09-15 14:40 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-09-05 12:06 [PATCH 0/3 v11] printk: Add new timestamps Prarit Bhargava
2017-09-05 12:06 ` [PATCH 1/3 v11] time: Make fast functions return 0 before timekeeping is initialized Prarit Bhargava
2017-09-05 12:15   ` Thomas Gleixner
2017-09-15 13:42     ` Prarit Bhargava
2017-09-05 12:06 ` [PATCH 2/3 v11] timekeeping: Provide NMI safe access to clock realtime Prarit Bhargava
2017-09-05 12:06 ` [PATCH 3/3 v11] printk: Add monotonic, boottime, and realtime timestamps Prarit Bhargava
2017-09-13 18:30   ` Mark Salyzyn
2017-09-15 13:28   ` Petr Mladek
2017-09-15 14:29     ` Mark Salyzyn
2017-09-17 10:46       ` Sergey Senozhatsky
2017-09-19 11:52         ` Prarit Bhargava
2017-09-15 14:40     ` Prarit Bhargava [this message]

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