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Date: Tue, 17 Aug 2010 19:23:08 +0400
From: Cyrill Gorcunov <gorcunov@gmail.com>
To: Robert Richter <robert.richter@amd.com>
Cc: Peter Zijlstra <peterz@infradead.org>, Don Zickus <dzickus@redhat.com>,
        Lin Ming <ming.m.lin@intel.com>, Ingo Molnar <mingo@elte.hu>,
        "fweisbec@gmail.com" <fweisbec@gmail.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "Huang, Ying" <ying.huang@intel.com>, Yinghai Lu <yinghai@kernel.org>,
        Andi Kleen <andi@firstfloor.org>
Subject: Re: [PATCH -v2] perf, x86: try to handle unknown nmis with running
	perfctrs
Message-ID: <20100817152308.GB5879@lenovo>
References: <20100804163930.GE5130@lenovo> <20100804184806.GL26154@erda.amd.com> <20100804192634.GG5130@lenovo> <20100806065203.GR26154@erda.amd.com> <20100806142131.GA1874@redhat.com> <20100809194829.GB26154@erda.amd.com> <20100816190659.GI5805@lenovo> <20100816225525.GO26154@erda.amd.com>
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On Tue, Aug 17, 2010 at 12:55:25AM +0200, Robert Richter wrote:
> On 16.08.10 15:06:59, Cyrill Gorcunov wrote:
> > I suspect Peter was supposed to be in To: field ;)
> 
> It was the attempt to answer 2 mails with one. :)
> 

ah, I see ;)

> > Robert, I think we still may miss unknown irq, consider the case when
> > unknown nmi is latched while you handle nmi from perf and what is
> > more interesting several counters may be overflowed. So you set
> > delta small enough and second (unknown nmi) will be in range and
> > treated as being perf back-to-back, or I miss something from patch?
> 
> Yes, that's true, but before you have to enable your Infinite
> Improbability Drive.
> 

not at all, it's absolutely legit to happen ;)

> -Robert
> 
> -- 
> Advanced Micro Devices, Inc.
> Operating System Research Center
> 
	-- Cyrill
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