Re: 2.4.17 absurd number of context switches

[Davide Libenzi]

On Fri, 28 Dec 2001, Stephan von Krawczynski wrote:

> On Fri, 28 Dec 2001 09:07:48 -0800 (PST)
> Davide Libenzi <[e-mail]> wrote:
>
> > The scheduler that Linus merged in 2.5.2-pre3 will solve the problem.
>
> Could you kindly provide a patch for 2.4.17 for Jeffrey to test and give
> comparison results to the list. This could be interesting for 2.4 too (which
> the world uses nowadays (and in the near future))?
>
> Thanks for your help ;-)

You can't, the scheduler is changed.
Try this, in sys_sched_yield() remove :

        spin_lock_irq(&runqueue_lock);
        move_last_runqueue(current);
        spin_unlock_irq(&runqueue_lock);

and replace it with :

        local_irq_disable();
        if (current->counter > 0)
            --current->counter;
        local_irq_enable();

- Davide