如何计算旧内核上的自愿上下文切换

Question

I want to find the number of voluntary context switches for a given pid.

I can find this using /proc/pid/status but non voluntary and voluntary context switches info was added from kernel 2.6.23.

I have to get this info on an older kernel. How can I do that ? My kernel version is -- 2.6.18

man page for proc entry that mentions the kernel version for this info -- http://man7.org/linux/man-pages/man5/proc.5.html

Answer 1

As far as I remember this old kernel has not supported TRACE EVENTS yet. So, may be you should hack your kernel ))). Eg add counter in struct task_struct and will be increment when context is switched.