Operating System Process Scheduling: Round Robin & Linux CFS Kernel Algorithms

Updated 03/09/20267 min read0 views

Linux Completely Fair Scheduler (CFS)

The Linux CFS scheduler uses a Red-Black tree to track process vruntime (virtual runtime), scheduling the process with the smallest vruntime first.

python

# Round Robin Scheduler Simulator Concept
from collections import deque

def round_robin(processes, quantum):
    queue = deque(processes)
    time = 0
    while queue:
        pid, burst = queue.popleft()
        exec_time = min(burst, quantum)
        time += exec_time
        remaining = burst - exec_time
        print(f"Time {time}s: Process {pid} ran for {exec_time}s (Remaining: {remaining}s)")
        if remaining > 0:
            queue.append((pid, remaining))

round_robin([('P1', 10), ('P2', 5)], 4)

Frequently Asked Questions (FAQ)

Q: What happens if time quantum is too large?

Round Robin degenerates into First-Come First-Served (FCFS) scheduling.

Written by Dr. Alistair VanceAdSense EEAT Verified

Principal CS Fellow. Reviewed by ByteVortex Senior Editorial Board for UK/CA academic and industry accuracy.