Re: Q: Scheduler and need_resched

[Anders Fugmann <afu@fugmann.dhs.org>]

Anders Fugmann wrote:
> Hi.
> 
> I got a small question of what happens codevice when the quantum of a 
> task is expired (counter == 0 -> need_resched == 1). Of cource schedule 
> is invoked somehow, but from where? How is the "flow". I see from where 
> do_timer is called, and that it schedules a BH, but then I'm stuck.
> 
> Any pointer appriciated.
> Anders Fugmann

Solved.
By the help of the kernel newbies pages, I was pointed to the page 
http://kernelnewbies.org/wiki/moin.cgi/Karthick, which pointed at
the label '_ret_with_reschedule' in entry.S.

This piece of assembler is called after each interrupt, and tests the 
need_resched flag to see is scheduling is nessesary.

Anyway, thanks for your time.
Anders Fugmann