> If you run more kernel code in privileged mode then you do not need to copy as much data between the kernel and user space.
Microkernels don't copy data into the kernel address space, they copy data between userland address spaces. Which still happens in monolithic systems anyway when you're doing IPC. These are typically short messages, often only data passed in registers.
And if copying is going to be a bottleneck, then you negotiate a shared address space just like in Unix, and no more copying.
Microkernels don't copy data into the kernel address space, they copy data between userland address spaces. Which still happens in monolithic systems anyway when you're doing IPC. These are typically short messages, often only data passed in registers.
And if copying is going to be a bottleneck, then you negotiate a shared address space just like in Unix, and no more copying.