Re: [Xenomai-core] [Xenomai-git] Jan Kiszka : nucleus: Fix interrupt handler tails

[Jan Kiszka <jan.kiszka@domain.hid>]

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On 2011-06-18 15:12, Gilles Chanteperdrix wrote:
> On 06/18/2011 03:07 PM, Jan Kiszka wrote:
>> On 2011-06-18 14:56, Gilles Chanteperdrix wrote:
>>>
>>> Maybe in the irq handlers, we should skip the XNHTICK replay, when
>>> current_domain is root_domain.
>>>
>>
>> That would be against the purpose of the XNTICK replay (it only targets
>> that particular case). And it would still leave us with broken ipipe due
>> to enabled IRQs on return from the Xenomai handlers.
> 
> What I mean is that xnintr_clock_handler, we should skip the XNHTICK
> replay when the current domain upon return from xnpod_schedule is not
> root. From what I understand, this case only happens when xnpod_schedule
> migrated the thread, and in that case, the tick will have been forwarded
> during xnpod_schedule anyway.

In the problematic case, ie. when the XNHTICK replay uses an invalid
sched, the current domain is root. It must be root because only then the
context could have been migrated to a different CPU by Linux. So this
does not help to avoid having to reload sched.

Jan


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