Re: [2.6.17-rc5-mm2] crash when doing second suspend: BUG in arch/i386/kernel/nmi.c:174

[Don Zickus <dzickus@redhat.com>]

On Tue, Jun 06, 2006 at 04:27:55PM -0700, Jeremy Fitzhardinge wrote:
> Andrew Morton wrote:
> >All the above applies to suspend-to-disk.  I don't know if suspend-to-RAM
> >shuts down the APs.
> >  
> 
> I'm using suspend-to-mem and it looks like its unplugging/replugging all 
> the CPUs.
> 
> The part of the question I don't quite understand is why this is 
> considered per-CPU state?  Surely NMI-watchdog is a system-wide thing?  
> Or does this also tie into other uses of the performance registers which 
> may be set per-CPU?
> 
>    J

The nmi watchdog is enable/disabled on a per-cpu basis.  The fact that a
single switch turns all of them on/off is just convienance.  Adding in
code to turn them on/off on a per-cpu basis just requires a simple user
interface.  It has been talked about before to deal with NUMA systems. 

Cheers,
Don

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