Windows operating system comes with both Kernel and User modes, but not everyone knows the difference between both. In fact, most users have no idea these modes exist, but yet they’ve used them before ...

Kernel Mode Linux (KML) is a technology that enables the execution of ordinary user-space programs inside kernel space. This article presents the background, an approach and an implementation of KML.

Looks simple enough; you would think there is not much overhead with only those two system calls. In reality, this couldn't be further from the truth. Behind those two calls, the data has been copied ...