Re: [PATCH] print kdump kernel loaded status in stack dump

[Andi Kleen]

On Fri, Jan 19, 2018 at 02:45:38PM +0900, Sergey Senozhatsky wrote:
> On (01/18/18 10:02), Andi Kleen wrote:
> > Dave Young <dyoung@xxxxxxxxxx> writes:
> > >  		printk("%sHardware name: %s\n",
> > >  		       log_lvl, dump_stack_arch_desc_str);
> > > +	if (kexec_crash_loaded())
> > > +		printk("%skdump kernel loaded\n", log_lvl);
> > 
> > Oops/warnings are getting longer and longer, often scrolling away
> > from the screen, and if the kernel crashes backscroll does not work
> > anymore, so precious information is lost.
> 
> true. I even ended up having a console_reflush_on_panic() function. it
> simply re-prints with a delay [so I can at least read the oops] logbuf
> entries every once in a while, staring with the first oops_in_progress
> record.

It would be better to make scrollback work even after panic (e.g. with a polled
keyboard driver)

-Andi