Stack usage

One of the problems we have in current OpenSSI is excessive stack 
usage.  This is often a problem when we use drbd for the root filesystem 
(cfs calls drbd which calls the socket layer which... runs out of stack).

So we're currently using 8KSTACKS.

But in general more recent versions of Linux are moving away from 
8KSTACKS.  (8KSTACKS only works if the system can be sure to allocate 
two contiguous pages, which can be difficult).

So, who is using the memory?

I have the impression that our RPC mechanism is using more memory than 
it should, we end up with quite a lot of code like:

    func1 (many params.....)
       many locals = many params;
       func 2 (many more params....);
          ...

And we have a one function that uses *huge* amounts of local stack:  the 
mosix derived function "consider" uses around 2148 bytes of stack on 
it's own!  (The only other functions in the kernel which use so much 
stack are the zlib things that are mostly only used on boot).

Just for info.



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