On 05/11/2011 12:50 PM, Gilles Chanteperdrix wrote:
> On 05/11/2011 12:29 PM, Alexey Galakhov wrote:
>> On 05/06/2011 03:33 PM, Gilles Chanteperdrix wrote:
>>> Ok, so there is a timer interrupt which does not result in reprogramming
>>> the timer, all you need to find out is why... Could you print the tsc
>>> value for each of these printks?
>>> Also, have you tried putting the call to the tsc update function in the
>>> acktimer function?
>> I did some more investigations and found what actually happens. The call
>> to xntimer_next_local_shot does not result in a call to
>> rthal_timer_program_shot due to "if (h == NULL)" condition. Does it mean
>> empty queue?
>>
>> Xenomai: real-time nucleus v2.5.6 (Wormhole Wizards) loaded.
>> rthal_timer_request[non-generic]
>> go
>> rthal_irq_request 30
>> ipipe_virtualize_irq 30 c0066bcc
>> rthal_timer_set_oneshot 1
>> _mach_set_dec 42187 3035818
>> _tsc_update
>> xenomai- steal_timer 1
>> xntimer_next_local_shot
>> xnarch_program_timer_shot 0
>> rthal_timer_program_shot 0
>> xntimer_tick_aperiodic
>> xntimer_next_local_shot
>> - return xntimerq_it_begin == NULL
>> Xenomai: starting native API services.
>> Xenomai: starting POSIX services.
>> Xenomai: starting RTDM services.
>> _mach_acktimer 0
>> xntimer_tick_aperiodic
>> xntimer_next_local_shot
>> - return xntimerq_it_begin == NULL
>> msgmni has been set to 119
>> Block layer SCSI generic (bsg) driver version 0.4 loaded (major 253)
>> io scheduler noop registered (default)
>
> I was going to check this real soon (tonight probably). At this point
> the only timer which should be in the list is the host timer. From
> memory, the host timer is or was installed in ksrc/nucleus/timer.c or
> ksrc/nucleus/pod.c depending on the return value of rthal_timer_request.
> rthal_timer_request implementation depends on CONFIG_GENERIC_CLOCKEVENTS.
>
> So, since we have not checked for some time the code in the case where
> this option is disabled, rthal_timer_request return value is probably
> now interpreted as meaning that we do not need a host timer, whereas we
> need one.
>
> This is my hypothesis at least, but I need to check exactly what happens.
>
Try this:
diff --git a/ksrc/arch/arm/hal.c b/ksrc/arch/arm/hal.c
index 2ca0d6c..534f97f 100644
--- a/ksrc/arch/arm/hal.c
+++ b/ksrc/arch/arm/hal.c
@@ -322,7 +322,7 @@ int rthal_timer_request(void (*handler)(void), int cpu)
rthal_timer_set_oneshot(1);
- return 0;
+ return 1000000000UL / HZ;
}
void rthal_timer_release(int cpu)
--
Gilles.
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