If the nvidia driver is dumping textures into compiz.real's memory space (which it does) and not freeing them (and it doesn't) then yes, unless you look closely it will look like compiz.real is taking more and more memory.
If the nvidia driver is dumping textures into compiz.real's memory space (which it does) and not freeing them (and it doesn't) then yes, unless you look closely it will look like compiz.real is taking more and more memory.