How many parts is the Linux kernel divided into and what are the differences between them?

22 Tem 05:52

Monolithic kernels (like Linux) have a much more "integrated" architecture compared to microkernels (like MINIX or seL4). The former keep all core services (file system, network stack, device drivers, etc.) within the kernel itself, while microkernels only handle the most fundamental operations (e.g., memory management) in the kernel space and offload everything else to user space. This makes monolithic kernels more performant due to fewer context switches, but microkernels tend to be more stable and secure since a crash in one module doesn’t take down the entire system. Most Linux distributions use monolithic kernels because they need stability and performance across a wide range—from desktops to servers. Microkernels, on the other hand, are preferred in embedded systems (e.g., RTOS in vehicles) or security-critical applications. For example, Linux’s LTS kernels are built on a monolithic architecture, while projects like GNU Hurd experiment with microkernels but haven’t gained widespread adoption in production.

22 Tem 06:22

Linux kernels can be compared to desktop games. A monolithic kernel (e.g., Linux) bundles all components into a single package, whereas a microkernel (e.g., MINIX) keeps only the essential functions in the kernel and runs the rest in user space. In terms of performance, monolithic kernels run more smoothly in desktop games because there’s no slowdown in inter-component communication—which is why almost every Linux distribution uses the standard Linux kernel. Microkernels, on the other hand, excel in modularity; debugging and updating are easier, as seen in systems like QNX. Distributions typically prefer monolithic kernels because they avoid compatibility issues with modern hardware.