linux-kernel - Re: linux-2.6.28-rc2 regression : oprofile doesnt work anymore ?

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Message-ID: <491471FC.3090709@cosmosbay.com>
Date:	Fri, 07 Nov 2008 17:51:08 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Ingo Molnar <mingo@...e.hu>,
	Pekka J Enberg <penberg@...helsinki.fi>,
	Robert Richter <robert.richter@....com>,
	linux kernel <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: linux-2.6.28-rc2 regression : oprofile doesnt work anymore ?

Andi Kleen a écrit :
> On Fri, Nov 07, 2008 at 05:12:33PM +0100, Eric Dumazet wrote:
>> Andi Kleen a écrit :
>>> On Fri, Nov 07, 2008 at 04:13:42PM +0100, Eric Dumazet wrote:
>>>> Andi Kleen a écrit :
>>>>> Can you please test this patch and see if it solves the problem?
>>>>>
>>>>> Thanks,
>>>>> -Andi
>>>>>
>>>>> ---
>>>>>
>>>>> oprofile: Fix p6 counter overflow check
>>>>>
>>>>> Fix the counter overflow check for CPUs with counter width > 32
>>>>>
>>>>> I had a similar change in a different patch that I didn't submit
>>>>> and I didn't notice the problem earlier because it was always
>>>>> tested together.
>>>>>
>>>>> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
>>>>>
>>>> Thanks Andi
>>>>
>>>> Unfortunatly, there is still a freeze of NMIS after a while.
>>> How long is the while?
>>>
>> Less than 20 seconds if fully loaded with "tbench 8" on my 8 cpus machine.
> 
> I don't have tbench on the test box, but when I load it with a couple
> of while true ; do true ; done loops it also continues sampling.
> 
> Are you sure it worked in 2.6.27?

You are right... I got same problem with 2.6.27.4, it seems...

$ grep NMI /proc/interrupts
NMI:     423689      79703    1576236     580137    1405669    1187909    2923037    5163299   Non-maskable interrupts
$ grep NMI /proc/interrupts
NMI:     423689      79703    1576236     580137    1405669    1187909    2923037    5163299   Non-maskable interrupts

I'll try to find the faulty commit.

Thank you


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