Re: [PATCH 3/3 v11] printk: Add monotonic, boottime, and realtime timestamps

From: Prarit Bhargava
Date: Fri Sep 15 2017 - 10:40:21 EST

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.