Uh, Shared GPU memory absolutely exists on Linux. Mind you this only exists (regardless of OS) when you have a shitty integrated GPU with no dedicated VRAM, but I am not sure why you think this only exists for Windows (or some other non-Linux OS, you did not specify).
Uh, Shared GPU memory absolutely exists on Linux. Mind you this only exists (regardless of OS) when you have a shitty integrated GPU with no dedicated VRAM, but I am not sure why you think this only exists for Windows (or some other non-Linux OS, you did not specify).
Pretty sure I saw on the arch wiki you can even use exclusive vram on a system