Linux - HowardWhile/2022_note GitHub Wiki
Linux
preempt_rt
https://wiki.linuxfoundation.org/realtime/documentation/howto/applications/preemptrt_setup
https://blog.csdn.net/qq_28882933/article/details/118293544
https://www.twblogs.net/a/5d8745c4bd9eee5327000981?lang=zh-cn
https://hackmd.io/@oscarshiang/peempt_rt_raspi
下載和patch
https://askubuntu.com/questions/1349568/installing-real-time-patch-for-ubuntu-20-04
https://chenna.me/blog/2020/02/23/how-to-setup-preempt-rt-on-ubuntu-18-04/
下載
https://www.kernel.org/pub/linux/kernel/
例如 linux-5.4.19 kernel from kernel.org and the rt patch
wget https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/linux-5.4.19.tar.xz
wget https://mirrors.edge.kernel.org/pub/linux/kernel/projects/rt/5.4/patch-5.4.19-rt11.patch.xz
解壓與patch
xz -cd linux-5.4.19.tar.xz | tar xvf -
cd linux-5.4.19
xzcat ../patch-5.4.19-rt11.patch.xz | patch -p1
config
複製本機的config檔，並且以之為基礎修改成RT kernel的版本
這邊我是先透過mainline將os kernel先換成跟要編譯的kernel版本一樣
cd linux-5.4.19
cp /boot/config-5.3.0-40-generic .config
配置
make oldconfig
主要是提示Preemption Model要修改成Fully Preemptible Kernel如圖：
編譯
#make -j8 deb-pkg
make -j$(nproc) bindeb-pkg
我用deb-pkg編譯打包會出錯誤改用bindeb-pkg則正常
編譯好久 I7-8700 12核心編譯要2個小時
編譯環境需要的pkg
ㄧapt install make libncurses-dev
make這應該不用解釋
libncurses-dev 使用配置config的指令時make menuconfig會提示缺少
編譯報錯
https://blog.csdn.net/qq_36393978/article/details/118157426
要修改.config之中的兩個參數
CONFIG_SYSTEM_TRUSTED_KEYS CONFIG_SYSTEM_REVOCATION_KEYS
https://blog.csdn.net/qq_36393978/article/details/124274364
sudo apt install dwarves
測試實時性
apt install rt-tests
#cyclictest
cyclictest -p 90 -S
-p: 優先級記得要打
-S: 標準測試
怎麼看ubuntu的版本代號
https://linuxconfig.org/ubuntu-22-04-kernel-version
uname -r
5.15.0-52-generic
5– Kernel version.15– Major revision.0– Minor revision.52– Patch number.
Linux kernel 安裝與切換
https://github.com/bkw777/mainline
https://www.sysgeek.cn/ubuntu-install-linux-mainline-kernel/
sudo add-apt-repository ppa:cappelikan/ppa
sudo apt update
sudo apt install mainline
mainline-gtk
