sched-plugin

sched-plugin allows user processes being handed out an option to use the existing Linux scheduler or to use Linux kernel module (LKM) based one.

Features

• The user processes initially writes its process ID (PID) to the file /proc/process_sched_add which corresponds to the kernel module proc_set. This procedure completes the registration of a process to the LKM Scheduler.
• The LKM based scheduler is executed internally via the kernel module proc_sched. The module executes a work queue construct for every time quanta.
• The proc_set and proc_sched modules are coupled through the kernel module process_queue. The process_queue module handles the internal details of all the processes associated with the LKM scheduler. It stores the process info a simple linked list nodes.
• Various interfaces are defined within the proc_queue to perform add, remove, get_first, print operations on the queue. The scheduler performs an add and remove based on the context switch operation being triggered for every time quantum.
• On every time quanta, the scheduler pushes the currently executing PID to the proc_queue via add_to_process interface. And change its execution from Running to wait via task based interfaces. Once the currently executing process is added successfully into the queue, the process in the front of the queue is selected. The selected process state is changed to running and also removed from the queue.

License

sched-plugin is released under the GNU GPL. Use of this source code is governed by a copyleft-style license that can be found in the LICENSE file.