Free memory, include "cached"?

[Gregoire Banderet <gregoire.banderet@xxxxxx>]

Hello,

I have to report the amount of FreeMem on my embedded system. The rootfs 
is in RAM. I use /proc/meminfo.
I started by doing : freemem = MemFree + Buffers + Cached
But I realized (tell me if I'm wrong) that my rootfs filesystems is 
counted in "Cached".
Part of the memory in "Cached" can be allocated, so I should add it as 
Free Memory, but part of it is my rootfs (i.e. really used).
How should I compute freemem ?

Thanks,
Greg

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