On Fri, Aug 24, 2012 at 09:26:08AM +0200, Mike Galbraith wrote:
> On Thu, 2012-08-23 at 12:04 +0200, Sedat Dilek wrote:
>
> > Jack Winter confirmed to see similiar NOHZ messages also on
> > v3.4.9-rt17 kernel (CPU: Core2Duo when no suspend performed):
> >
> > [15223.171585] NOHZ: local_softirq_pending 08
>
> These can be caused by blocking while holding local_softirq_lock.
>
> Even with per softirq threads, and then (yet more overhead) splitting
> the lock to make sure one softirq type can't block another, _and_ only
> griping if the lock for the pending softirq is _not_ held, seems the
> little bugger can still be triggered very rarely by syn flood induced
> handler bail/raise. Annoying little gripe :)
Hmmm... Now that you mention it, if I understand correctly, the
conversion of spinlocks to sleeplocks in -rt would seem to invalidate
this particular diagnostic completely.
So, what am I missing?
Thanx, Paul
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