Re: Re: [Xenomai-help] Standard linux assignment of processes to CPUs depends on Xenomai Config

["M. Koehrer" <mathias_koehrer@domain.hid>]

Hi!

I am very busy this week, I can do a check next week.
However, it looks as Dmitry aleady got a clue to that issue... 

Regards

Mathias
> Hi,
> 
> I suppose, that's what happens.
> 
> __xeno_sys_init() (./ksrc/nucleus/module.c) which is module_init() and
> when compiled in -> initcall()
> 
> calls xnarch_init() (./include/asm-i386/bits/init.h)
> 
> This one amongst other things does
> 
> ...
> #ifdef CONFIG_SMP
>         /* Make sure the init sequence is kept on the same CPU when
>            running as a module. */
>         set_cpus_allowed(current, cpumask_of_cpu(0));
> #endif /* CONFIG_SMP */
> 
> In fact, "running as a module" seems to be a bit
> misleading here.  Then another macro should be used in addition,
> MODULE or how it's called.
> 
> Now guess who is a "current" here? It's "init" (pid 0).
> 
> init() -> do_basic_setup() -> do_initcalls() -> ... ->
> __xeno_sys_init() -> xnarch_init()
> 
> "init" is a first process to run and all the rest will inherit its
> "cpus_allowed" field.
> 
> That's it.
> 
> -- 
> Best regards,
> Dmitry Adamushko
> 

-- 
Mathias Koehrer
mathias_koehrer@domain.hid


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