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    SubjectRe: [PATCH 0/3 v2] nmi perf fixes

    * Robert Richter <robert.richter@amd.com> wrote:

    > On 10.09.10 10:46:34, Ingo Molnar wrote:
    > >
    > > * Don Zickus <dzickus@redhat.com> wrote:
    > >
    > > > On Fri, Sep 10, 2010 at 01:41:40PM +0200, 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...
    > > >
    > > > What are you running to create the problem? I can try and duplicate
    > > > it here.
    > >
    > > It happens easily here - just running something like:
    > >
    > > perf record -g ./hackbench 10
    >
    > I try to reproduce it, which systems are affected?

    This is an older Barcelona box, will send you a dump of details off-list.

    > > a couple of times triggers it. Note, unlike with the earlier bug,
    > > the NMIs are not permanently 'stuck' - and everything continues
    > > working. Obviously the messages are nasty looking so this is a
    > > regression we need to fix.
    >
    > The patch below adds ratelimits.

    This doesnt solve things though - even one unnecessary message will
    confuse users.

    Ingo


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