Re: [PATCH 2/2] printk: Add boottime and real timestamps

[Thomas Gleixner]

On Fri, 28 Jul 2017, Prarit Bhargava wrote:
> On 07/25/2017 09:00 AM, Peter Zijlstra wrote:
> Thanks for the above change.  I can see that makes the code simpler.
> 
> > Although I must strongly discourage using REALTIME, DST will make
> > untangling your logs an absolute nightmare. I would simply not provide
> > it.
> 
> I understand your concern, however, I've been in situations where REALTIME
> stamping has pointed me in the direction of where a bug was.  Even with the
> complicated logs I think it is worthwhile.

As Mark pointed out. ktime_get_real() and the fast variant return UTC. The
timezone mess plus the DST nonsense are done in user space.

Thanks,

	tglx