Perhaps the following is a better patch compare to earlier one.
The p->sleep_type are only for SCHED_NORMAL as well, so we can
bypass them altogether in one shot.
RT task does not participate in interactiveness priority and thus
shouldn't be bothered with timestamp and p->sleep_type manipulation
when task is being put on run queue. Bypass all of the them with
a single if (rt_task) test.
Signed-off-by: Ken Chen <[email protected]>
--- ./kernel/sched.c.orig 2006-11-14 13:29:37.000000000 -0800
+++ ./kernel/sched.c 2006-11-14 14:05:39.000000000 -0800
@@ -938,6 +938,9 @@ static void activate_task(struct task_st
{
unsigned long long now;
+ if (rt_task(p))
+ goto out;
+
now = sched_clock();
#ifdef CONFIG_SMP
if (!local) {
@@ -947,9 +950,7 @@ static void activate_task(struct task_st
+ rq->timestamp_last_tick;
}
#endif
-
- if (!rt_task(p))
- p->prio = recalc_task_prio(p, now);
+ p->prio = recalc_task_prio(p, now);
/*
* This checks to make sure it's not an uninterruptible task
@@ -974,7 +975,7 @@ static void activate_task(struct task_st
}
}
p->timestamp = now;
-
+out:
__activate_task(p, rq);
}
-
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