This Tutorial begins with a clean ubuntu 16.04.2 install. Actual kernel is 4.13.0-38-generic, but we will install another one.
If you are a company or rich person :) using rt_preempt, check https://wiki.linuxfoundation.org/realtime/rtl/blog#preempt-rt-history
Check on https://wiki.linuxfoundation.org/realtime/start what the latest stable version is, at this time it is Latest Stable Version 4.9-rt. If we click on the link, we get the exact version, it is patch-4.9.84-rt62.patch.gz
We create a directory in our home dir with
mkdir ~/kerneland switch into it with
cd ~/kernelWe can go with a browser to https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ and see if the version is there, then download it with
wget https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/linux-4.9.84.tar.gzunpack it with
tar -xzf linux-4.9.84.tar.gzrename it to the same name with postfix of the patch version
mv linux-4.9.84 linux-4.9.84-rt62download rt_preempt patch with
wget ftp.ntu.edu.tw/linux/kernel/projects/rt/4.9/older/patch-4.9.84-rt62.patch.gzunpack it with
gunzip patch-4.9.84-rt62.patch.gzThen switch into the linux directory with
cd linux-4.9.84-rt62/and patch the kernel with the realtime patch
patch -p1 < ../patch-4.9.84-rt62.patch
We simply wanna use the config of our ubuntu installation, so we use the ubuntu config with
cp /boot/config-4.13.0-38-generic .configTo enable all ubuntu-configurations, we simply use
yes '' | make oldconfigWe need some tools, install them with
sudo apt install libncurses5-dev build-essential libssl-dev ccacheThen we need to enable rt_preempt in the kernel. We call
make menuconfigand choose under “Processor Type and Features” --- “Preemption Model” --- “Fully Preemptible kernel (RT)”
Exit menuconfig and run
makeYou could use “make -j4” if you got 4-cpu-cores to build faster.
Then we need to build the kernel modules with
sudo make modules_installThen we install the kernel to /boot and update grub with
sudo make install