Re: [patch] Real-Time Preemption, -VP-2.6.9-rc4-mm1-U4

[Ingo Molnar]

* Adam Heath <doogie@xxxxxxxxxx> wrote:

> > after bootup it makes sense to reset the maximum:
> >
> > 	echo 10 > /proc/sys/kernel/preempt_max_latency
> >
> > because during bootup there are a number of latencies that are one-time
> > only.
> 
> So, I did that, and immediately started getting more stack dumps.  Are
> these things that are interesting, or only informational?

they are informational, if you are evaluating latencies. Feel free to
post larger latencies. Right now the threshold for "large" depends - on
a fast box i'd say latencies above 200 usecs are worth reporting - but
any trace can be interesting. Latencies above 1000 usecs are definitely
worth seeing.

stability has the highest priority at the moment, and the other type of
non-latency stackdumps (scheduling while atomic, smp_processor_id()
warnings or outright kernel oopses) should always be reported if
possible.

	Ingo
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