What kernel version did you get this code?
I looked at 2.6.22.1 (my kernel version) and found this piece of code:
/*
* wake_up_new_task - wake up a newly created task for the first time.
*
* This function will do some initial scheduler statistics housekeeping
* that must be done for every newly created context, then puts the task
* on the runqueue and wakes it.
*/
void fastcall wake_up_new_task(struct task_struct *p, unsigned long clone_flags)
{
......
if (likely(cpu == this_cpu)) {
if (!(clone_flags & CLONE_VM)) {
/*
* The VM isn't cloned, so we're in a good position to
* do child-runs-first in anticipation of an exec. This
* usually avoids a lot of COW overhead.
*/
if (unlikely(!current->array))
__activate_task(p, rq);
else {
....
}
set_need_resched();
} else
/* Run child last */
__activate_task(p, rq);
The variable ...sysctl_sched_child_runs
_first it's not present, such as /sys relationship..... Perhaps was
removed from oldest version, anybody know about that?
Cheers;
Renê
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