Re: [patch] serial console vs NMI watchdog

Ingo Molnar
2001-03-11T07:55:33Z

On Sun, 11 Mar 2001, Keith Owens wrote:

> kdb has to completely disable the nmi counter while it is in control.
> All interrupts are disabled, all but one cpus are spinning, the
> control cpu does busy wait while it polls the input devices. With
> that model there is no alternative to a complete disable.

it sure has an alternative. The 'cpus spinning' code calls touch_nmi()
within the busy loop, the polling code on the control CPU too. This is
sure more robust and catches lockup bugs in kdb too ...

Ingo