kstackusage() patch request for comments

Hi.

I have made a patch
http://www.mavhome.dp.ua/kstackusage.patch
that implements machine dependent function returning current kernel thread stack usage statistics and uses it in netgraph subsystem for receiving maximum benefit from direct function calls and minimum queueing while keeping stack protected. As I have never developed machine-dependant things I would like to hear any comments about it.

The main question I have is about source files and headers I should use for this specific purposes. Is it correct way to define function in machine independent header, but implement it in machdep.c? Or I should define it in machine dependent headers?

Also I would be grateful for help with implementations of this function for arch different from i386/amd64.

Thanks.

--
Alexander Motin
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