From: Cyrill Gorcunov <gorcunov@gmail.com>
To: Don Zickus <dzickus@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>, Lin Ming <ming.m.lin@intel.com>,
Shaun Ruffell <sruffell@digium.com>,
Maciej Rutecki <maciej.rutecki@gmail.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Stephane Eranian <eranian@google.com>,
Robert Richter <robert.richter@amd.com>,
lkml <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH -tip] perf, x86: fix unknown NMIs on a Pentium4 box
Date: Fri, 15 Apr 2011 00:18:52 +0400 [thread overview]
Message-ID: <4DA756AC.6030201@gmail.com> (raw)
In-Reply-To: <4DA75373.9040705@openvz.org>
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
prev parent reply other threads:[~2011-04-14 20:18 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-14 14:48 [PATCH -tip] perf, x86: fix unknown NMIs on a Pentium4 box Cyrill Gorcunov
2011-04-14 15:03 ` Ingo Molnar
2011-04-14 15:06 ` Cyrill Gorcunov
2011-04-14 17:43 ` Ingo Molnar
2011-04-14 17:44 ` Ingo Molnar
2011-04-14 17:49 ` Cyrill Gorcunov
2011-04-14 18:12 ` Shaun Ruffell
2011-04-14 18:14 ` Cyrill Gorcunov
2011-04-14 18:19 ` Cyrill Gorcunov
2011-04-14 19:35 ` David Ahern
2011-04-14 17:46 ` Cyrill Gorcunov
2011-04-14 18:32 ` Don Zickus
2011-04-14 18:45 ` Ingo Molnar
2011-04-14 18:46 ` Ingo Molnar
2011-04-14 19:43 ` Cyrill Gorcunov
2011-04-14 19:57 ` Don Zickus
2011-04-14 20:05 ` Cyrill Gorcunov
2011-04-14 20:18 ` Cyrill Gorcunov [this message]
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