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SubjectRe: [PATCH 0/3 v2] nmi perf fixes
I think the broader issue here is that I think we should not have
so many subsystems hanging off of that die_register(). The NMI
should be for perf_events only. Many in there have nothing to do
with performance monitoring. They are mostly debug features.

On Fri, Sep 10, 2010 at 2:10 PM, Stephane Eranian <> wrote:
> On Fri, Sep 10, 2010 at 1:41 PM, Peter Zijlstra <> wrote:
>> On Thu, 2010-09-02 at 15:07 -0400, Don Zickus wrote:
>>> Fixes to allow unknown nmis to pass through the perf nmi handler instead
>>> of being swallowed.  Contains patches that are already in Ingo's tree.  Added
>>> here for completeness.  Based on ingo/tip
>>> Tested on intel/amd
>>> v2: patch cleanups and consolidation, no code changes
>>> Don Zickus (1):
>>>   perf, x86: Fix accidentally ack'ing a second event on intel perf
>>>     counter
>>> Peter Zijlstra (1):
>>>   perf, x86: Fix handle_irq return values
>>> Robert Richter (1):
>>>   perf, x86: Try to handle unknown nmis with an enabled PMU
>>>  arch/x86/kernel/cpu/perf_event.c       |   59 +++++++++++++++++++++++++-------
>>>  arch/x86/kernel/cpu/perf_event_intel.c |   15 +++++---
>>>  arch/x86/kernel/cpu/perf_event_p4.c    |    2 +-
>>>  3 files changed, 56 insertions(+), 20 deletions(-)
>> Both Ingo and I are getting Dazed and confused on our AMD machines, it
>> started before yesterday (that is, after backing out all my recent
>> changes it still gets dazed), so I suspect this set.
>> I'll look at getting a trace of the thing, but if any of you has a
>> bright idea...
> I still don't buy the back-to-back NMI thing. I suspect there is
> something else going on. I have continued to track it down.
> I got closer yesterday, until I ran into other issues. It may
> have to do with throttling. I am still trying to understanding
> why the OVF_STATUS does not match the check based on
> the counter values.
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