Re: [PATCH -tip] perf, x86: fix unknown NMIs on a Pentium4 box

[Cyrill Gorcunov]

On 04/15/2011 12:05 AM, Cyrill Gorcunov wrote:
...
>>
>> I don't think this patch will work.  It would make sense if the unmasking
>> happened _after_ the "if (!handled)" path, but that is not the path Ingo
>> wanted for v1.
> 
> This thing happened if inflight nmi reaches the system and note that inflight
> NMI comes from perf and masks lvt entry, it has nothing to do with "handled" but
> rather the _fact_ that NMI reached apic via LVTPC and as result -- masked it.
> Don, I might be missin something, brain is slowly going to sleep :)
> 

Seems I'm wrong in this assumption, otherwise when this mechanism was
introduced for first time every in-flight nmi catched would block further
perf activity.

>>
>> Cheers,
>> Don
>>

-- 
    Cyrill
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