Re: [PATCH] watchdog: Make sure the watchdog thread gets CPU onloaded system

[Don Zickus]

On Thu, Mar 15, 2012 at 03:00:51PM +0100, Peter Zijlstra wrote:
> On Thu, 2012-03-15 at 13:42 +0100, Ingo Molnar wrote:
> > So unless there's concensus to remove everything but the hard 
> > lockup detection facilities, lets solve the technical problem at 
> > hand, ok? 
> 
> Well, at least make it possible to disable the silly soft thing.
> 
> And I really wouldn't know how the soft thing could possible help,
> except when not actually having a NMI watchdog. What case does it
> trigger where the NMI one doesn't?

I think softlockup really boils down to a pre-emption disabled detector
much like how the hardlockup really is a interrupts disabled detector.

The amount of code preventing the scheduler from running is most likely a
lot lower than the code the prevents interrrupts from happening.

Cheers,
Don

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