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

Eric Dumazet
2008-11-07T16:51:45Z

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@linux.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