Re: [patch] CFS scheduler, -v15

["Dmitry Adamushko" <dmitry.adamushko@gmail.com>]

On 06/06/07, Srivatsa Vaddagiri <vatsa@in.ibm.com> wrote:
> On Wed, Jun 06, 2007 at 09:01:43AM +0200, Ingo Molnar wrote:
> > [...] and my tree already contains the fixes for rt task's
> > exec_start.
>
> Can I have this snapshot pls? I have to deal with the same issue when
> the current task switches groups and I was planning to fix it by
> introducing a set_curr_task() method in fair_sched_class which
> initializes exec_start and other fields for that task.

Hum.. what about accounting 'exec_time' and updating 'exec_start' in
rt_sched :: dequeue_task_rt() instead (like update_curr() does it in
dequeue_task_fair())?

This way, on RT -> NORMAL transition.. some 'delta_exec' ( between
deactivate_task() ---> activate_task() ) will be accounted later as if
the task was 'sched_fair_class' during this time.. which I think makes
some sense. What do you think?

sched_setscheduler()
{
...
       on_rq = p->on_rq;
       if (on_rq)
               deactivate_task(rq, p, 0);
       oldprio = p->prio;
       __setscheduler(rq, p, policy, param->sched_priority);
       if (on_rq) {
               activate_task(rq, p, 0);
...


> --
> Regards,
> vatsa

--
Best regards,
Dmitry Adamushko
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