Pid of current running process

Question

Friends, I'm trying to track the complete execution of the operating system, including processes running on top of it. For this, I want the instructions to be executed by each process and its execution trace, and I want to do this without having to run the objdump of each process.

So, my goals are:
1) Building the address space of each pid.

2) Tracking the execution of each pid.

To achieve the above goals, I run a Linux-based operating system on top of the Qemu emulator.

When qemu first encounters a command, I will check the pid of the process executing this instruction using io-port or a known physical memory address in the guest system. Then I can use this information to do what I need.

My problem is ....... where in the kernel /sched.c I can find out the pid of the process that will be launched next. So I can’t calculate a function call like → launch_process (pid). If someone, please indicate to me this place in the core. Or is there a known place in the system where we can track the address space. One of them is CR3, but I really can't trust him.

For some guys, this may seem like a trivial pointer to this place, but I cannot find this location on my own.

Answer 1

struct task_struct. find_task_by_*(), struct task_struct PID task_pid_*(), PID . . " struct pid?" include/linux/pid.h.

: . struct rq kernel/sched.c.

try_to_wake_up(), wake_up_process(), wake_up_new_task(), context_switch() .