Linux Kernel Module – Page Table Walker Objective The purpose of this assignment is to gain…

Linux Kernel Module – Page Table Walker

Objective

The purpose of this assignment is to gain experience writing code that executes in kernel (protected) mode in Linux by implementing a Linux Kernel Module. It is best to complete this assignment on a virtual machine. In case of problems, it is easier to restart a virtual machine, than to restart the host system.

The goal of the assignment is to build a kernel module that traverses the list of running processes and generates report that displays the process ID, process name of all processes with PID > 650, and the total number of pages allocated in memory. This report output from the kernel module should be made to the kernel log files (/var/log/syslog in Ubuntu) and to a Linux “proc” file under the “/proc” directory.

The extra creditgoes to the extra information in the report that show the number of pages that are allocated contiguously vs. non-contiguously in physical memory for each process.

Sample Output

Output should be generated in comma separated value (CSV) format. The columns “contig_pages” and “noncontig_pages” are optional.

The first line says “PROCESS REPORT:”. The second line is a comma-separated header line describing the columns. The columns are proc_idfor the process ID, proc_namefor the process name (the comm field of task_struct), and total_pageswhich is the total number of memory pages allocated (i.e., in use) for the process.

Optionalcolumns include: contig_pageswhich is the number of contiguous pages, and noncontig_pageswhich is the number of non-contiguous pages.

The last line of the report is optional. The last line displays TOTALSin the first cell, a blank value in the second cell and provide a sum of the total number of contiguous pages, total number of non-contiguous pages, and the total number of pages for all processes with PID > 650.

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