linux-kernel - Re: [PATCH -tip] perf, x86: P4 PMU - Add missing read of a counter before test

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Message-ID: <4D8B75A9.3010002@gmail.com>
Date:	Thu, 24 Mar 2011 19:47:37 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Lin Ming <ming.m.lin@...el.com>, Don Zickus <dzickus@...hat.com>,
	Linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -tip] perf, x86: P4 PMU - Add missing read of a counter
 before test

On 03/24/2011 07:46 PM, Cyrill Gorcunov wrote:
...
>>
>> So what effect does this have on the regular perf user? Please try to describe 
>> the real-life effect of the bug/problem fixed here.
>>
>> Thanks,
>>
>> 	Ingo
> 
> Unflagged overflows never have been catched due to missed read of a register which
> is to signalize about it, and as result unknown nmi may happen leading to
> "Dazen and confused" message. That is what supposed to be in changelog?
> 

Or you mean the tech details would be appropriate in changelog as well? If so
I could put such details there.

-- 
    Cyrill
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