On 10/09/2014 01:06 PM, GP Orcullo wrote:
> On Oct 9, 2014 6:16 PM, "Gilles Chanteperdrix" <
> [email protected]> wrote:
>>
>> On 10/09/2014 12:12 PM, GP Orcullo wrote:
>>> On Thu, Oct 9, 2014 at 6:06 PM, Gilles Chanteperdrix
>>> <[email protected]> wrote:
>>>> On 10/09/2014 12:02 PM, GP Orcullo wrote:
>>>>> On Mon, Oct 6, 2014 at 6:30 AM, Gilles Chanteperdrix
>>>>> <[email protected]> wrote:
>>>>>>
>>>>>> It means that Linux was interrupted by Xenomai during its timer
>>>>>> interrupt, and that Xenomai interrupted it for 280us. This may
>>>>>> happens with switchtest if it has a really long chain of context
>>>>>> switches. If you want to check what happened, enable the I-pipe
>>>>>> tracer, and trigger a trace freeze right before this message.
>>>>>>
>>>>>> --
>>>>>> Gilles.
>>>>>
>>>>> One more piece to the puzzle: disabling CONFIG_IPIPE_DEBUG_INTERNAL
>>>>> causes the system to lockup.
>>>>>
>>>> How do you know this is related?
>>>>
>>>> --
>>>> Gilles.
>>>
>>> Sorry, I quoted the wrong message.
>>>
>>> If CONFIG_PREEMPT is disabled and CONFIG_IPIPE_DEBUG_INTERNAL is not
>>> disabled, the system works fine.
>>>
>> So, there is a problem, likely in your port with CONFIG_PREEMPT, but
>> maybe in Xenomai (I need to check, because I am not so sure I tested
>> xeno-regression-test without CONFIG_PREEMPT).
>>
>> And there is a problem in your port without CONFIG_IPIPE_DEBUG_INTERNAL.
>> This I do not need to check, I have tested Xenomai wihout this option
>> enabled.
>>
>> So, my question is: how do you know the two issues are related?
>>
>> --
>> Gilles.
>
> I don't know the answer.
>
> I'm only looking at the effects and not the cause of the issue.
>
> So, where shall I start digging? What's in CONFIG_IPIPE_DEBUG_INTERNAL
> that would somehow suppress the problem?
>
Basically, you can grep IPIPE_DEBUG_INTERNAL in the sources, and try and
apply the diffs hunk by hunk. As a wild guess, I would start with the
one in arch/arm/asm/percpu.h.
--
Gilles.
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