Re: [patch] voluntary-preempt-2.6.8.1-P2

Lee Revell
2004-08-17T00:06:32Z

On Mon, 2004-08-16 at 10:12, Thomas Charbonnel wrote:
> I wrote :
> > Ingo Molnar wrote :
> > > here's -P2:
> > >
> > > http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.8.1-P2
> > >
> > > Changes since -P1:
> > >
> > > - trace interrupted kernel code (via hardirqs, NMIs and pagefaults)
> > >
> > > - yet another shot at trying to fix the IO-APIC/USB issues.
> > >
> > > - mcount speedups - tracing should be faster
> > >
> > > Ingo
> >
> > Same do_IRQ problem with P2, trace is here :
> > http://www.undata.org/~thomas/swapper-P2.trace
> >
> > Thomas
> >
>
> Ok, maybe that was a false positive. In fact the trace corresponds to
> some preempt violation occurring during the boot process :
> preemption latency trace v1.0
> -----------------------------
> latency: 136095 us, entries: 4000 (14818)
> process: swapper/1, uid: 0
> nice: 0, policy: 0, rt_priority: 0

Yes, I get this one too. Maybe the tracer should ignore such huge
values, as they seem to only happen during boot and there dosn't seem to
be a reason to fix them.

Lee