Re: [Xenomai-help] Latency calculation and test

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

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Johan Borkhuis wrote:
-snip-
> :|  # func               -1916    0.512  xntimer_do_tick_aperiodic+0x14 [xeno_nucleus] (xnpod_announce_tick+0x48 [xeno_nucleus])
> :|  # func               -1916    0.463  xnthread_periodic_handler+0x14 [xeno_nucleus] (xntimer_do_tick_aperiodic+0x2c0 [xeno_nucleus])
> :|  # func               -1915    0.609  xnpod_resume_thread+0x14 [xeno_nucleus] (xnthread_periodic_handler+0x5c [xeno_nucleus])
> :|  # [ 1160] -<?>-   79 -1915    0.878  xnpod_resume_thread+0x78 [xeno_nucleus] (xnthread_periodic_handler+0x5c [xeno_nucleus])
> :|  # func               -1914    0.365  xnpod_schedule+0x14 [xeno_nucleus] (xnintr_irq_handler+0x1fc [xeno_nucleus])
> :|  # [    0] swapper -1 -1913+   1.829  xnpod_schedule+0xb8 [xeno_nucleus] (xnintr_irq_handler+0x1fc [xeno_nucleus])
> :|  # [ 1160] -<?>-   79 -1912    0.829  xnpod_schedule+0x420 [xeno_nucleus] (xnpod_suspend_thread+0x20c [xeno_nucleus])
> :|  # func               -1911    0.390  xntimer_get_raw_clock_aperiodic+0x14 [xeno_nucleus] (xnpod_wait_thread_period+0xd0 [xeno_nucleus])
> :|  # func               -1910    0.317  __ipipe_restore_pipeline_head+0x14 (xnpod_wait_thread_period+0x130 [xeno_nucleus])
> :|  + end     0x80000000 -1910+   1.878  __ipipe_restore_pipeline_head+0xd4 (xnpod_wait_thread_period+0x130 [xeno_nucleus])
> :|  + begin   0x80000001 -1908    0.414  __ipipe_dispatch_event+0x1e4 (__ipipe_syscall_root+0x64)
> :|  + end     0x80000001 -1908!  52.121  __ipipe_dispatch_event+0x204 (__ipipe_syscall_root+0x64)
> :   + func               -1857+   1.170  do_page_fault+0x14 (handle_page_fault+0xc)

This one is interesting: page fault over the RT-thread that belongs to
PID 1160 (prio 79).

> :   + func               -1856    0.487  __ipipe_dispatch_event+0x14 (do_page_fault+0x188)
> :|  + begin   0x80000001 -1855    0.926  __ipipe_dispatch_event+0x27c (do_page_fault+0x188)
> :|  + end     0x80000001 -1854    0.585  __ipipe_dispatch_event+0x1a4 (do_page_fault+0x188)
> :   + func               -1854    0.975  exception_event+0x14 (__ipipe_dispatch_event+0x1bc)
> :   + func               -1853    0.609  xnarch_trap_fault+0x14 [xeno_nucleus] (exception_event+0x88)
> :   + func               -1852    0.902  xnpod_trap_fault+0x14 [xeno_nucleus] (xnarch_trap_fault+0x38 [xeno_nucleus])
> :   + func               -1851    0.878  xnpod_fault_handler+0x14 [xeno_nucleus] (xnpod_trap_fault+0x68 [xeno_nucleus])
> :   + func               -1851    0.536  xnshadow_relax+0x14 [xeno_nucleus] (xnpod_fault_handler+0x98 [xeno_nucleus])
> :|  + begin   0x80000001 -1850+   1.073  xnshadow_relax+0x15c [xeno_nucleus] (xnpod_fault_handler+0x98 [xeno_nucleus])
> :|  # func               -1849+   1.292  schedule_linux_call+0x14 [xeno_nucleus] (xnshadow_relax+0x7c [xeno_nucleus])
> :|  # func               -1848    1.000  rthal_apc_schedule+0x14 (schedule_linux_call+0xc8 [xeno_nucleus])
> :|  # func               -1847+   1.609  __ipipe_schedule_irq+0x14 (rthal_apc_schedule+0x10c)
> :|  # func               -1845+   1.585  rpi_push+0x14 [xeno_nucleus] (xnshadow_relax+0x84 [xeno_nucleus])
> :|  # func               -1844    0.463  xnpod_schedule_runnable+0x14 [xeno_nucleus] (rpi_push+0x84 [xeno_nucleus])
> :|  # [    0] swapper 79 -1843+   1.658  xnpod_schedule_runnable+0x54 [xeno_nucleus] (rpi_push+0x84 [xeno_nucleus])

And now we are running the Linux kernel at xeno-prio 79 (due to
prio-coupling).

/me has to leave, other may jump in.

Jan


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