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

[Adam Heath]

On Sat, 16 Oct 2004, Ingo Molnar wrote:

>
> * Adam Heath <doogie@xxxxxxxxxx> wrote:
>
> > > i have released the -U4 PREEMPT_REALTIME patch:
> > >
> > >    http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.9-rc4-mm1-U4
> > >
> > > this is a fixes-only release, and it is still experimental code.
> >
> > Few stack dumps now.
>
> these are normal, they are the PREEMPT_TIMING traces which get printed
> every time the kernel measures a new latency maximum. The stack dumps
> are done to make it easier to identify which place too that long of a
> delay and why. (if LATENCY_TRACE is enabled too then the last latency
> and its trace can also be found in /proc/latency_trace.)
>
> 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?
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