schedular..

["shyam Burkule" <shyam.burkule@xxxxxxxxx>]

I was reading about schedular.. i have following question..

 

Who schedule the schedular? I mean , let linux uses round-robin scheduling policy, with some time slice say 'x'. So process can run upto x time slice and if not finished it is preemted and schedular schedule another process to run. So my question is that,  how kernel comes to know that time slice expire and now preempt the current process? (I think kernel might be decrementing time slice,but when this happen,because in uniprocessor system , CPU is currently assigned to running process.)

Thanks

  Shyam