Re: [Xenomai-help] Page-fault, switch to secondary mode

[Philippe Gerum <rpm@xenomai.org>]

On Wed, 2010-08-25 at 11:12 +0200, Bharath Achuta Bhat wrote:
> Hello Xenomai experts,
> 
> 
> I am running a xenomai-2.5.1 patched kernel (v 2.6.30.3) with ipipe
> version 2.7-06.
> The target is powerpc (MPC8533E).
> My application is switching to the secondary mode (I guess because of
> a page-fault) when ntohl() is called.
> This is a libc function and I am wondering why only this function
> (ntohl()) is causing a page-fault.

What memory are you reading from / writing to in the statement involving
ntohl()? Is this plain RAM, or mapped I/O memory?

> 
> 
> Here is how the application looks like
> 
> 
> main ()
> {
> ...
> ...
> /* Avoids memory swapping for this program */
> mlockall(MCL_CURRENT | MCL_FUTURE);
> 
> 
> ......
> ......
> /* signal handlers */
> .....
> .....
> /* create communication pipes */
> rt_pipe_create(&tPipe1, .....
> rt_pipe_create(&tPipe2,.......
> 
> 
> /* create RT tasks */
> rt_task_create(&tTask1,.....
> rt_task_create(&tTask2,......
> ...........
> ..........
> 
> 
> /* start the RT tasks */
> rt_task_start(&tTask1,.....
> ..............
> ..............
> 
> 
> /* turn the current thread into RT function */
> ret = rt_task_shadow(NULL, "RT main function", 1, T_SUSP);
> 
> 
> ....
> ....
> 
> 
> }
> 
> 
> One of the rt tasks created calls ntohl() and switches to secondary
> mode.
> Is there a way to avoid it ? 
> 
> 
> -- 
> Thanks and regards
> Bharath
> 
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-- 
Philippe.