RCU Tasks Tracing Kernel Thread: rcu_tasks_trace_kthread(13) Explained

The function rcu_tasks_trace_kthread(13) creates and initializes a kernel thread for tracing RCU (Read-Copy-Update) tasks. \n\nHere is a step-by-step breakdown of what the function does:\n\n1. The function takes an argument, 13, which is used to set the CPU affinity of the created kernel thread.\n\n2. It declares a variable, "p", of type "struct task_struct". This struct represents a process or thread in the Linux kernel.\n\n3. It calls the "kthread_create" function to create a kernel thread. The first argument is a pointer to the "rcu_tasks_trace" function, which is the entry point for the created thread. The second argument is a pointer to the argument passed to "rcu_tasks_trace_kthread" function, which is 13 in this case. The third argument is a string that represents the name of the thread.\n\n4. The "kthread_bind" function is called to set the CPU affinity of the created thread. The first argument is a pointer to the thread struct, and the second argument is the CPU number to which the thread should be bound, which is 13 in this case.\n\n5. The "wake_up_process" function is called to wake up the created thread, allowing it to start executing.\n\n6. Finally, the function returns the pointer to the created thread struct.\n\nThis function is typically used to create a kernel thread that will be responsible for tracing RCU tasks. The CPU affinity is set to ensure that the thread runs on a specific CPU.