Kernel preemption is a feature of the Linux kernel that allows processes and threads to be interrupted and resumed at any time. This allows the kernel to better respond to real-time requirements and improve system performance.
To turn on kernel preemption in Linux, you can follow these steps:
cat /boot/config-$(uname -r) | grep CONFIG_PREEMPT
If the output of the command includes a line that starts with "CONFIG_PREEMPT=y", kernel preemption is already enabled on your system. If the output includes a line that starts with "CONFIG_PREEMPT=n", kernel preemption is disabled.
If kernel preemption is disabled, you can enable it by recompiling the kernel with the "CONFIG_PREEMPT" option set to "y". Consult the documentation for your Linux distribution to learn how to rebuild the kernel with custom configuration options.
After building and installing the new kernel with kernel preemption enabled, you can boot into the new kernel by updating the boot loader configuration (such as "grub.conf" or "menu.lst") to specify the new kernel as the default boot option. Consult the documentation for your boot loader for more information on how to update the boot configuration.
With these steps, you should be able to turn on kernel preemption in Linux by rebuilding the kernel with the "CONFIG_PREEMPT" option set to "y" and booting into the new kernel.
Note: Enabling kernel preemption can improve system performance and responsiveness, but it can also increase the complexity of the kernel code and increase the risk of kernel bugs and crashes. Consult the Linux kernel documentation for more information on kernel preemption and the "CONFIG_PREEMPT" option.