https://github.com/28ritu/modifying-cfs-scheduler
https://github.com/28ritu/modifying-cfs-scheduler
cfs operating-system scheduler
Last synced: about 1 month ago
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- Host: GitHub
- URL: https://github.com/28ritu/modifying-cfs-scheduler
- Owner: 28Ritu
- Created: 2018-05-04T15:03:05.000Z (about 7 years ago)
- Default Branch: master
- Last Pushed: 2018-05-04T16:08:28.000Z (about 7 years ago)
- Last Synced: 2025-02-14T17:42:52.614Z (3 months ago)
- Topics: cfs, operating-system, scheduler
- Language: C
- Size: 240 KB
- Stars: 0
- Watchers: 0
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# Modifiying-CFS-Scheduler
## Sneha Sinha - 2016098 & Ritu Kumari - 2016078
### Part 1: Compiling the source code
The linux 3.19.0 source code is downloaded and it's
extracted.
- cd to that directory
- do 'cp /boot/config-$(uname -r) .config' to copy the kernel's .config file then followed by 'make menuconfig'
- use 'sudo make -j 4 && sudo make modules_install -j 4 && sudo make install -j 4'.The kernel and modules are compiled.
- do 'update-initramfs -c -k 3.19.0' to update the kernel, and 'update-grub' to add it to the grub.
### Part 2: Modifying CFS
- Updated /include/linux/sched.h task struct to include srt flags and requirements.
- Updated /kernel/sched/fair.c to include the required scheduling policy for SRT tasks.
### Part 3: Making 'rtnice' System Call
- Made info directory in the kernel.
- 'info' directory includes:
####
1. rtnice.c - C code for System call implementation.
2. rtnice.h - header file.
3. Makefile - Makefile for c code.
- Updated arch/x86/syscalls/syscall64.tbl to include the 'rtnice' system call.
- Updated Linux kernel main Makefile to include the 'rtnice' system call.
### Part 4: Testing
- rtnicetest.c tests the rtnice system call and the modified cfs scheduler.
#### ERRORS:
1. if no task with given PID exists.
2. if timeslice < 1 or greater than a certain value.
##### PS: Patch can be applied to the linux-kernel 3.19 on Ubuntu Server 14.04.4. (Kernel may go into panic mode. Apply patch on your own risk)