Am 09.07.2015 um 16:19 schrieb Gilles Chanteperdrix:
On Thu, Jul 09, 2015 at 02:15:55PM +0200, Johann Obermayr wrote:
Hello,
we have follow situation
u64 lrtdrv_time_of_irq_ns ;
void worker_task()
{
while(1)
{
rtdm_task_sleep_abs(lrtdrv_time_of_irq_ns + 950000ull,
RTDM_TIMERMODE_ABSOLUTE);
do_something();
}
}
_kernel_rtdm_irq_handler()
{
lrtdrv_time_of_irq_ns = rtdm_clock_read_monotonic();
}
the _kernel_irq_callback() is called every 1ms.
we will , that the worker_task begin 50us before next irq
But sometime, the worker task start ~50us after irq. Why ?
Best way to know, enable the I-pipe tracer, setup sufficient back
trace points, and when the wrong wake up happens, trigger an I-pipe
trace.
i will enable i-pipe tracer.
found out, that
rtdm_task_sleep_abs(xxx, RTDM_TIMERMODE_ABSOLUTE);
u64 calc = rtdm_clock_read_monotonic();
sometime the diff between xxx & calc is biger than 61000ns.
forget to say.
worker_task run on Core1
irq_handler run on Core0
Regards
Johann
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