ARM Linux kernel Lab

My Operating System course has, generally, 4 to 5 assignments corresponding to each chapter of the book: " Operating Systems Design and Implementation, Third Edition ", i.e., 1. Introduction, 2. Processes, 3. Input and Output, 4. Memory and 5. File Systems. For the first assignment, I ask students to implement a simple system call. Generally, I divide the class into 10 teams which are given 10 different tasks. General Instructions to the First Assignment A system call makes a software interrupt. All teams must install docker and Shibata's work, visualize the switch from user to kernel mode following:  http://linux-kernel-lab.blogspot.com.br/2018/04/arm-linux-kernel-on-docker-image-with.html http://linux-kernel-lab.blogspot.com.br/2018/04/first-run.html http://linux-kernel-lab.blogspot.com.br/2018/04/first-init.html http://linux-kernel-lab.blogspot.com.br/2018/04/rebuilding-new-docker-image.html http://linux-kernel-lab.blogspot.com.br/2018/04/creating-new-te...

  Team 1: page fault on calloc  Using phase 4 of Shibata's team , write a program that continually gets memory (calloc) and writes on a structure, creating a circular linked list (where each cell is in this structure), i.e., a cell (this structure) must point to the former one and to the next one. Make sure you write on the data structure in order to force a major page fault. Explain how virtual memory was allocated by /proc/$PID/maps (the process may be blocked by a getchar). Did the calloc took memory from heap or from stack? After some time, due to virtual memory, data must go to disk in order to free memory to more data through do_swap_page. How much memory did your process get? Make sure the swap area is very large, greater than 4GB. You may experiment getting little or big chunks of memory using calloc. Does it change how much memory your process get? Team 2: shared memory Using phase 4 of Shibata's team , implement a program that creates a shared memory greater tha...

  Phase 2 All teams, please study:  https://linux-kernel-lab.blogspot.com/2018/06/block-and-unblock-process-assignment.html Team 1 - process hierachy Study: -V52: https://www.youtube.com/watch?v=tSnT9SYAb9A Create the system call pid_father() which returns the pid of the father (see task_struct).  Make init creates one child which creates one grandson. Both init and grandson continually prints "init" and father's pid, however, the child process, exits. What happens to the grandson parent? Study the linux source code and show how the kernel changes the grandson's father. Study the Linux kernel code in order to understand what happens when a child process has his father killed. Team 2 - signal Study the following code: #include<stdio.h> #include<signal.h> void bypass_sigint(int sig_no) {   printf("divide by zero\n"); } int main() {   int a,b,c;     struct sigaction sa;     memset(&sa, 0, sizeof(sa));     sa.sa_handler ...

Phase 2 All teams, please study:  https://linux-kernel-lab.blogspot.com/2018/06/block-and-unblock-process-assignment.html Team 1 - process hierachy Study: -V52: https://www.youtube.com/watch?v=tSnT9SYAb9A Create the system call pid_father() which returns the pid of the father (see task_struct).  Make init creates one child which creates one grandson. Both init and grandson continually prints "init" and father's pid, however, the child process, exits. What happens to the grandson parent? Study the linux source code and show how the kernel changes the grandson's father. Team 2 - signal Study the following code: #include<stdio.h> #include<signal.h> void bypass_sigint(int sig_no) {   printf("divide by zero\n"); } int main() {   int a,b,c;     struct sigaction sa;     memset(&sa, 0, sizeof(sa));     sa.sa_handler = &bypass_sigint;     sigaction(SIGFPE, &sa,NULL);     while (1) {     ...

Team 1: page fault on calloc Using phase 4 of Shibata's team , write a program that continually gets memory (calloc) and writes on a structure, creating a circular linked list (where each cell is in this structure), i.e., a cell (this structure) must point to the former one and to the next one. Make sure you write on the data structure in order to force a major page fault. Explain how virtual memory was allocated by /proc/$PID/maps (the process may be blocked by a getchar). Did the calloc took memory from heap or from stack? After some time, due to virtual memory, data must go to disk in order to free memory to more data through do_swap_page. How much memory did your process get? Make sure the swap area is very large, greater than 4GB. You may experiment getting little or big chunks of memory using calloc. Does it change how much memory your process get? Team 2: shared memory Using phase 4 of Shibata's team , implement a program that creates a shared memory greater tha...