问题
I am having a hard time finding information about how to set cpu affinity for linux kernel (with all of its loaded modules), NOT for a specific process.
This is because I want the kernel to run on CPU 0 all the time to handle I/O stuff, and not do any switches to run on other 3 CPUs because it may pollute L1 and L2 caches.
Thanks in advance.
Nulik
回答1:
Kernel work on behalf of processes will always happen on the CPU that makes the request. You can steer interrupts, though. Look at /proc/interrupts to identify the interrupts you want to move (say everything matching eth0) and set the affinity by echoing a hexadecimal mask to /proc/irq/XXX/smp_affinity.
回答2:
You should be able to disable the other cores via a kernel command-line option.
Not having the kernel run on a core implies that nothing else can run on that core either. No kernel scheduler and no TLB setup -> no code executing.
来源：https://stackoverflow.com/questions/7476656/setting-cpu-affinity-for-linux-kernel-not-process