Re: [Xenomai-help] [Fwd: Performance decrease]

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

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Philippe Gerum wrote:
>>  On the other side I cannot compile RTDM support in without it; the error message when linking vmlinux
>> at the end of the Kernel compile stage is:
>>>  
>>>
>>> drvlib.c:(.text+0x19f8): undefined reference to `__va_to_kva'
>>>
> 
> I guess that rtdm_mmap_buffer() should be made dependent on
> CONFIG_XENO_OPT_PERVASIVE too.

True. Will craft some patch.

> 
>>>  
>>>
>>>
>>>
>>> For what is the real-time support in user space option good for ?
>>>
> 
> This allows running Xenomai applications in user-space, instead of
> implementing them as kernel modules.
> 

Everyone planning to write kernel-space drivers and/or applications
should keep an eye on some non-technical aspect as well: the license.
That's no problem for in-house, unpublished work. But for things that
are to be given away / sold, one should recall that the kernel community
is more and more considering non-GPL modules in general as a license
infringement.

Jan


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