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    SubjectRe: 2.6.19-rc5: known regressions (v3)
    On 11/22/06, Andrew Morton <akpm@osdl.org> wrote:
    > On Wed, 22 Nov 2006 11:36:14 +0100
    > Andi Kleen <ak@suse.de> wrote:
    >
    > > On Wednesday 22 November 2006 11:28, Eric Dumazet wrote:
    > > > On Wednesday 15 November 2006 11:35, Eric Dumazet wrote:
    > > > > On Wednesday 15 November 2006 11:21, Adrian Bunk wrote:
    > > > > > Subject : x86_64: oprofile doesn't work
    > > > > > References : http://lkml.org/lkml/2006/10/27/3
    > > > > > Submitter : Prakash Punnoor <prakash@punnoor.de>
    > > > > > Status : unknown
    > > > >
    > > >
    > > > I hit the same problem on i386 architecture too, if CONFIG_ACPI is not set.
    > >
    > > oprofile is still broken because it cannot deal with the lack of perfctr 0.
    >
    > The kernel is still broken because we changed the interface.

    I just got bit by this on 2.6.20-latest (well, of two days ago anyway)
    while trying to debug another transient 'kacpid sucks all available
    cpu time'. But that's okay, I'm sure it will happen again in a week or
    two.

    In the meantime, who won this pis^H^H^H discussion?

    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.
    >
    > Note that oprofile (and perfctr) didn't do anything behind the
    > NMI watchdog's back. They went via the API. Nothing dodgy going on.

    Well, that seems clear.
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