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Subject: Re: [patch] voluntary-preempt-2.6.8.1-P2
From: Lee Revell <rlrevell@joe-job.com>
To: Thomas Charbonnel <thomas@undata.org>
Cc: Ingo Molnar <mingo@elte.hu>, Florian Schmidt <mista.tapas@gmx.net>,
       linux-kernel <linux-kernel@vger.kernel.org>,
       Felipe Alfaro Solana <felipe_alfaro@linuxmail.org>
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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