Re: linux-2.6.28-rc2 regression : oprofile doesnt work anymore ?

[Eric Dumazet]

Andi Kleen a écrit :
> On Fri, Nov 07, 2008 at 04:13:42PM +0100, Eric Dumazet wrote:
> > Andi Kleen a écrit :
> > > Can you please test this patch and see if it solves the problem?
> > >
> > > Thanks,
> > > -Andi
> > >
> > > ---
> > >
> > > oprofile: Fix p6 counter overflow check
> > >
> > > Fix the counter overflow check for CPUs with counter width > 32
> > >
> > > I had a similar change in a different patch that I didn't submit
> > > and I didn't notice the problem earlier because it was always
> > > tested together.
> > >
> > > Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
> > Thanks Andi
> >
> > Unfortunatly, there is still a freeze of NMIS after a while.
>
> How long is the while?

Less than 20 seconds if fully loaded with "tbench 8" on my 8 cpus machine.

With your patch, many events are handled by oprofile (about 10.000.000
last time I tried) before freeze.

Without your patch, freeze was very very fast, no more than 10.000 NMI...



> I don't see this here on a Merom when I let it run for
> 10 minutes or so.
>
> You might need to bisect it.

Too many bugs during bisection unfortunatly, machine doesnt boot :(


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