Applications can already manage their own memory in Linux. O_DIRECT bypasses the buffer cache when doing I/O, and there are plenty of ways that applications can

Applications can already manage their own memory in Linux. O_DIRECT bypasses the buffer cache when doing I/O, and there are plenty of ways that applications can influence or take control of their own memory using various system calls, many of which overlap or are redundant to some degree. It doesn't require a microkernel, and it's not new.