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SubjectRe: [discuss] Re: 2.6.19-rc5: known regressions (v3)
Andrew Morton writes:
> On Thu, 16 Nov 2006 11:55:46 +0100
> Mikael Pettersson <> wrote:
> > Andrew Morton writes:
> > > Surely the appropriate behaviour is to allow oprofile to steal the NMI and
> > > to then put the NMI back to doing the watchdog thing after oprofile has
> > > finished with it.
> >
> > Which is _exactly_ what pre-2.6.19-rc1 kernels did. I implemented
> > the in-kernel API allowing real performance counter drivers like
> > oprofile (and perfctr) to claim the HW from the NMI watchdog,
> > do their work, and then release it which resumed the watchdog.
> OK. But from Andi's comments it seems that the NMI watchdog was failing to
> resume its operation.

It certainly worked when I originally implemented it. If it didn't work
that way before 2.6.19-rc1 butchered it then that would have been a bug
that should have been fixed.
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