Linux core isolation

Linux core isolation

I have a real-time task that needed to run periodically at a constant rate - a continuous IRQ drives it. Just running this task on a multithreaded environment can cause it to run in different timing values. When the system runs on stress (using stress utility) the system is not a response to all IRQ requests. A possible solution to this problem is to use Linux core isolation. In this case, we assign a specific core for the task, and the Linux kernel is getting out from the SMP balancing, and this core can use for a particular job with minimal interrupts.

turn on the device and press any key to stop u-boot and command line. Type the following command (which can change between different board)

setenv mmcargs "setenv bootargs console=${console} root=${mmcroot} video=${video} isolcpus=2"

after boot, type and see the isolated core.

# cat /sys/devices/system/cpu/isolated


Here are some reference sources that used to create this post
[1] Whole one core dedicated to a single process
[3] how to detect if isolcpus is activated?

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