Memory allocation methods and type programming in the Linux kernel

In the Linux kernel, memory allocation is an important and complex task. The kernel needs to manage the system's physical memory and allocate appropriate memory space for different tasks and data structures. In this article, I will introduce the commonly used memory allocation methods and types in the Linux kernel and provide corresponding source code examples.

1. Static memory allocation
   Static memory allocation is to allocate a fixed size of memory space for a variable or data structure at compile time. These variables are usually defined in the global scope, and their memory space is determined before the program runs. Here's a simple example:

#include <linux/module.h>

static int my_array[100];

static int __init my_module_init(void)