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Non Killable Process

Generally all the process having parent process ID is 0 is not killable, because kernel process id is 0.
Depends upon the kernel it varies, just check it yours by giving command as :
ps -ef | awk ' $3==1 { print $0 }'

root 1 0 0 Apr06 ? 00:00:01 /sbin/init
root 2 0 0 Apr06 ? 00:00:00 [kthreadd]

1.init : init program is the first program run after your kernel begins running.
2.kthreadd: Kernel thread daemon which mainly used for device drivers

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