Linux Kernel hast three memory allocator named SLOB, SLAB and SLUB. SLOB allocator is the memory allocator that is used to allocate small amount of memory for Linux kernel objects. Linux kernel objects are different from user mode objects. So we can’t use a user mode application for testing SLOB allocator. For example, if we modify the algorithm used in SLOB allocator, we have to test it using some kernel module which can make memory request to our new SLOB allocator. Continue reading “Testing Slob Allocator”
Writing Linux kernel module is a daunting task. This easy to follow, step by step guide will show us all the steps of writing Linux kernel module. Read this writing to learn about what is a kernel module.
This tutorial will be our starting point for writing Linux kernel module. For this one we won’t be using any real hardware. But gradually we’ll learn how to write a device driver for an actual hardware. Our approach will start from learning most basic module to advanced device driver. Continue reading “Writing Linux Kernel Module”
Kernel module is a piece of program which can be loaded or unloaded in the kernel dynamically. It is used to extend the functionality of the kernel without rebooting the system. When we attach a new hardware in our computer we have to install a device driver for it. Device driver is a kernel module which allows the kernel to communicate with the hardware device. Continue reading “Linux Kernel Module”