Correctly determine amount of "free memory"

[Gregory Giguashvili]

Hi,

Assuming that I define "free memory" as maximum memory that can be
allocated without causing swapping, is there a way I can give the best
"free memory" amount estimate?

I've tried to play with /proc/meminfo values with some progress, but I'd
like to get a qualified answer from people working with VM bits and
bytes.

Thanks a lot
Giga
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