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

[Eric Dumazet]

Andi Kleen a écrit :
> On Fri, Nov 07, 2008 at 05:12:33PM +0100, Eric Dumazet wrote:
> > 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.
>
> I don't have tbench on the test box, but when I load it with a couple
> of while true ; do true ; done loops it also continues sampling.
>
> Are you sure it worked in 2.6.27?

You are right... I got same problem with 2.6.27.4, it seems...

$ grep NMI /proc/interrupts
NMI:     423689      79703    1576236     580137    1405669    1187909    2923037    5163299   Non-maskable interrupts
$ grep NMI /proc/interrupts
NMI:     423689      79703    1576236     580137    1405669    1187909    2923037    5163299   Non-maskable interrupts

I'll try to find the faulty commit.

Thank you


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