Re: kgdb support in vanilla 2.6.2

[Andi Kleen <ak@suse.de>]

On Wed, 3 Mar 2004 21:18:50 -0800
Andrew Morton <akpm@osdl.org> wrote:

> "Amit S. Kale" <amitkale@emsyssoft.com> wrote:
> >
> > Flashing keyboard lights is easy on x86 and x86_64 platforms. 
> 
> Please, no keyboards.  Some people want to be able to use kgdboe
> to find out why machine number 324 down the corridor just died.

Not as the only indication I agree. But for machines running X that
are actually used by people I think it's important to always give some kind 
of visual feedback when the X server freezes. And kgdb will make the X server
freeze. You could actually make it a notifier list to register severals
ways to do this, e.g. the cluster people could add something that makes
it flash a warning light. For a standard box I think flashing the keyboard
is a good default for now

(ok there are USB keyboards too, for those there will need to be a different
solution)

> 
> char *why_i_crashed;
> 
> 
> {
> 	...
> 	if (expr1)
> 		why_i_crashed = "hit a BUG";
> 	else if (expr2)
> 		why_i_crashed = "divide by zero";
> 	else ...
> }
> 
> then provide a gdb macro which prints out the string at *why_i_crashed?

That doesn't tell the user at all why his X server just froze.
But it may be a good addition.

-Andi