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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 <mikpe@it.uu.se> 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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