taglinefilesource code
cpu_system210fs/proc/array.ckstat.cpu_system,
cpu_system211fs/proc/array.cjiffies - (kstat.cpu_user + kstat.cpu_nice + kstat.cpu_system),
cpu_system15include/linux/kernel_stat.hunsigned int cpu_user, cpu_nice, cpu_system;
cpu_system910kernel/sched.ckstat.cpu_system += system;