Re: [PATCH] printk: Print cpu number along with time

Jiri Kosina
2014-04-24T22:21:29Z

On Thu, 24 Apr 2014, David Rientjes wrote:

> > Well, if you have dmesg dump from panic that happens every other year, and
> > you have to do post-mortem analysis on it, I am pretty sure you would love
> > to be able to figure out how the stack traces would look like without
> > inter-CPU interleaving. And I am pretty sure you wouldn't want to
> > insert/enable a tracepoint and wait another two years for the bug to
> > trigger again.
>
> Sounds like the appropriate fix would be to serialize stack dumping to the
> kernel log.

That's rather difficult, as it can be done both from NMI and non-NMI
contexts, and those are very hard to synchronize.

--
Jiri Kosina
SUSE Labs