Native preemption is the culprit [was Re: today's CURRENT lockups]

[Michael L. Hostbaek]

Robert Watson (rwatson) writes:
> 
> (This time to more people)
> 
> The patch below appears to (brute force) eliminate the crash/hang I'm
> experiencing with SCHED_ULE in the post-preemption universe.  However, I
> was experiencing it only in the SMP case, not UP, so it could be I'm just
> not triggering it timing-wise.  This would be a temporary fix until jhb is
> online again post-USENIX to take a look, assuming this works around the
> problem for people other than me.

I've been using this patch on my UP machine for 5-6 hours now, without
any hangs/crashes.

Thanks, 

-- 
Best Regards,
	Michael L. Hostbaek 
	mich at FreeBSD.org - http://www.FreeBSD.org

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