On Fri, 19 Jan 2018 08:16:04 -0800
Andi Kleen <ak@xxxxxxxxxxxxxxx> wrote:
> 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)
I ended up using a serial console on all my machines. Yes, even my
laptop has one (virtual, provided by Intel AMT).
Anyway, what do you mean by a polled keyboard driver? My keyboard is
connected with USB. A polling xhci driver? Surely possible, but is it
worth the effort?
Petr T
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